1 /* Fold a constant sub-tree into a single node for C-compiler
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /*@@ This file should be rewritten to use an arbitrary precision
21 @@ representation for "struct tree_int_cst" and "struct tree_real_cst".
22 @@ Perhaps the routines could also be used for bc/dc, and made a lib.
23 @@ The routines that translate from the ap rep should
24 @@ warn if precision et. al. is lost.
25 @@ This would also make life easier when this technology is used
26 @@ for cross-compilers. */
28 /* The entry points in this file are fold, size_int_wide and size_binop.
30 fold takes a tree as argument and returns a simplified tree.
32 size_binop takes a tree code for an arithmetic operation
33 and two operands that are trees, and produces a tree for the
34 result, assuming the type comes from `sizetype'.
36 size_int takes an integer value, and creates a tree constant
37 with type from `sizetype'.
39 Note: Since the folders get called on non-gimple code as well as
40 gimple code, we need to handle GIMPLE tuples as well as their
41 corresponding tree equivalents. */
45 #include "coretypes.h"
51 #include "fold-const.h"
52 #include "stor-layout.h"
54 #include "tree-iterator.h"
57 #include "hard-reg-set.h"
59 #include "insn-config.h"
69 #include "diagnostic-core.h"
71 #include "langhooks.h"
74 #include "basic-block.h"
75 #include "tree-ssa-alias.h"
76 #include "internal-fn.h"
78 #include "gimple-expr.h"
84 #include "generic-match.h"
87 /* Nonzero if we are folding constants inside an initializer; zero
89 int folding_initializer
= 0;
91 /* The following constants represent a bit based encoding of GCC's
92 comparison operators. This encoding simplifies transformations
93 on relational comparison operators, such as AND and OR. */
94 enum comparison_code
{
113 static bool negate_mathfn_p (enum built_in_function
);
114 static bool negate_expr_p (tree
);
115 static tree
negate_expr (tree
);
116 static tree
split_tree (tree
, enum tree_code
, tree
*, tree
*, tree
*, int);
117 static tree
associate_trees (location_t
, tree
, tree
, enum tree_code
, tree
);
118 static enum comparison_code
comparison_to_compcode (enum tree_code
);
119 static enum tree_code
compcode_to_comparison (enum comparison_code
);
120 static int operand_equal_for_comparison_p (tree
, tree
, tree
);
121 static int twoval_comparison_p (tree
, tree
*, tree
*, int *);
122 static tree
eval_subst (location_t
, tree
, tree
, tree
, tree
, tree
);
123 static tree
distribute_bit_expr (location_t
, enum tree_code
, tree
, tree
, tree
);
124 static tree
make_bit_field_ref (location_t
, tree
, tree
,
125 HOST_WIDE_INT
, HOST_WIDE_INT
, int);
126 static tree
optimize_bit_field_compare (location_t
, enum tree_code
,
128 static tree
decode_field_reference (location_t
, tree
, HOST_WIDE_INT
*,
130 machine_mode
*, int *, int *,
132 static int simple_operand_p (const_tree
);
133 static bool simple_operand_p_2 (tree
);
134 static tree
range_binop (enum tree_code
, tree
, tree
, int, tree
, int);
135 static tree
range_predecessor (tree
);
136 static tree
range_successor (tree
);
137 static tree
fold_range_test (location_t
, enum tree_code
, tree
, tree
, tree
);
138 static tree
fold_cond_expr_with_comparison (location_t
, tree
, tree
, tree
, tree
);
139 static tree
unextend (tree
, int, int, tree
);
140 static tree
optimize_minmax_comparison (location_t
, enum tree_code
,
142 static tree
extract_muldiv (tree
, tree
, enum tree_code
, tree
, bool *);
143 static tree
extract_muldiv_1 (tree
, tree
, enum tree_code
, tree
, bool *);
144 static tree
fold_binary_op_with_conditional_arg (location_t
,
145 enum tree_code
, tree
,
148 static tree
fold_mathfn_compare (location_t
,
149 enum built_in_function
, enum tree_code
,
151 static tree
fold_inf_compare (location_t
, enum tree_code
, tree
, tree
, tree
);
152 static tree
fold_div_compare (location_t
, enum tree_code
, tree
, tree
, tree
);
153 static bool reorder_operands_p (const_tree
, const_tree
);
154 static tree
fold_negate_const (tree
, tree
);
155 static tree
fold_not_const (const_tree
, tree
);
156 static tree
fold_relational_const (enum tree_code
, tree
, tree
, tree
);
157 static tree
fold_convert_const (enum tree_code
, tree
, tree
);
158 static tree
fold_view_convert_expr (tree
, tree
);
159 static bool vec_cst_ctor_to_array (tree
, tree
*);
162 /* Return EXPR_LOCATION of T if it is not UNKNOWN_LOCATION.
163 Otherwise, return LOC. */
166 expr_location_or (tree t
, location_t loc
)
168 location_t tloc
= EXPR_LOCATION (t
);
169 return tloc
== UNKNOWN_LOCATION
? loc
: tloc
;
172 /* Similar to protected_set_expr_location, but never modify x in place,
173 if location can and needs to be set, unshare it. */
176 protected_set_expr_location_unshare (tree x
, location_t loc
)
178 if (CAN_HAVE_LOCATION_P (x
)
179 && EXPR_LOCATION (x
) != loc
180 && !(TREE_CODE (x
) == SAVE_EXPR
181 || TREE_CODE (x
) == TARGET_EXPR
182 || TREE_CODE (x
) == BIND_EXPR
))
185 SET_EXPR_LOCATION (x
, loc
);
190 /* If ARG2 divides ARG1 with zero remainder, carries out the exact
191 division and returns the quotient. Otherwise returns
195 div_if_zero_remainder (const_tree arg1
, const_tree arg2
)
199 if (wi::multiple_of_p (wi::to_widest (arg1
), wi::to_widest (arg2
),
201 return wide_int_to_tree (TREE_TYPE (arg1
), quo
);
206 /* This is nonzero if we should defer warnings about undefined
207 overflow. This facility exists because these warnings are a
208 special case. The code to estimate loop iterations does not want
209 to issue any warnings, since it works with expressions which do not
210 occur in user code. Various bits of cleanup code call fold(), but
211 only use the result if it has certain characteristics (e.g., is a
212 constant); that code only wants to issue a warning if the result is
215 static int fold_deferring_overflow_warnings
;
217 /* If a warning about undefined overflow is deferred, this is the
218 warning. Note that this may cause us to turn two warnings into
219 one, but that is fine since it is sufficient to only give one
220 warning per expression. */
222 static const char* fold_deferred_overflow_warning
;
224 /* If a warning about undefined overflow is deferred, this is the
225 level at which the warning should be emitted. */
227 static enum warn_strict_overflow_code fold_deferred_overflow_code
;
229 /* Start deferring overflow warnings. We could use a stack here to
230 permit nested calls, but at present it is not necessary. */
233 fold_defer_overflow_warnings (void)
235 ++fold_deferring_overflow_warnings
;
238 /* Stop deferring overflow warnings. If there is a pending warning,
239 and ISSUE is true, then issue the warning if appropriate. STMT is
240 the statement with which the warning should be associated (used for
241 location information); STMT may be NULL. CODE is the level of the
242 warning--a warn_strict_overflow_code value. This function will use
243 the smaller of CODE and the deferred code when deciding whether to
244 issue the warning. CODE may be zero to mean to always use the
248 fold_undefer_overflow_warnings (bool issue
, const_gimple stmt
, int code
)
253 gcc_assert (fold_deferring_overflow_warnings
> 0);
254 --fold_deferring_overflow_warnings
;
255 if (fold_deferring_overflow_warnings
> 0)
257 if (fold_deferred_overflow_warning
!= NULL
259 && code
< (int) fold_deferred_overflow_code
)
260 fold_deferred_overflow_code
= (enum warn_strict_overflow_code
) code
;
264 warnmsg
= fold_deferred_overflow_warning
;
265 fold_deferred_overflow_warning
= NULL
;
267 if (!issue
|| warnmsg
== NULL
)
270 if (gimple_no_warning_p (stmt
))
273 /* Use the smallest code level when deciding to issue the
275 if (code
== 0 || code
> (int) fold_deferred_overflow_code
)
276 code
= fold_deferred_overflow_code
;
278 if (!issue_strict_overflow_warning (code
))
282 locus
= input_location
;
284 locus
= gimple_location (stmt
);
285 warning_at (locus
, OPT_Wstrict_overflow
, "%s", warnmsg
);
288 /* Stop deferring overflow warnings, ignoring any deferred
292 fold_undefer_and_ignore_overflow_warnings (void)
294 fold_undefer_overflow_warnings (false, NULL
, 0);
297 /* Whether we are deferring overflow warnings. */
300 fold_deferring_overflow_warnings_p (void)
302 return fold_deferring_overflow_warnings
> 0;
305 /* This is called when we fold something based on the fact that signed
306 overflow is undefined. */
309 fold_overflow_warning (const char* gmsgid
, enum warn_strict_overflow_code wc
)
311 if (fold_deferring_overflow_warnings
> 0)
313 if (fold_deferred_overflow_warning
== NULL
314 || wc
< fold_deferred_overflow_code
)
316 fold_deferred_overflow_warning
= gmsgid
;
317 fold_deferred_overflow_code
= wc
;
320 else if (issue_strict_overflow_warning (wc
))
321 warning (OPT_Wstrict_overflow
, gmsgid
);
324 /* Return true if the built-in mathematical function specified by CODE
325 is odd, i.e. -f(x) == f(-x). */
328 negate_mathfn_p (enum built_in_function code
)
332 CASE_FLT_FN (BUILT_IN_ASIN
):
333 CASE_FLT_FN (BUILT_IN_ASINH
):
334 CASE_FLT_FN (BUILT_IN_ATAN
):
335 CASE_FLT_FN (BUILT_IN_ATANH
):
336 CASE_FLT_FN (BUILT_IN_CASIN
):
337 CASE_FLT_FN (BUILT_IN_CASINH
):
338 CASE_FLT_FN (BUILT_IN_CATAN
):
339 CASE_FLT_FN (BUILT_IN_CATANH
):
340 CASE_FLT_FN (BUILT_IN_CBRT
):
341 CASE_FLT_FN (BUILT_IN_CPROJ
):
342 CASE_FLT_FN (BUILT_IN_CSIN
):
343 CASE_FLT_FN (BUILT_IN_CSINH
):
344 CASE_FLT_FN (BUILT_IN_CTAN
):
345 CASE_FLT_FN (BUILT_IN_CTANH
):
346 CASE_FLT_FN (BUILT_IN_ERF
):
347 CASE_FLT_FN (BUILT_IN_LLROUND
):
348 CASE_FLT_FN (BUILT_IN_LROUND
):
349 CASE_FLT_FN (BUILT_IN_ROUND
):
350 CASE_FLT_FN (BUILT_IN_SIN
):
351 CASE_FLT_FN (BUILT_IN_SINH
):
352 CASE_FLT_FN (BUILT_IN_TAN
):
353 CASE_FLT_FN (BUILT_IN_TANH
):
354 CASE_FLT_FN (BUILT_IN_TRUNC
):
357 CASE_FLT_FN (BUILT_IN_LLRINT
):
358 CASE_FLT_FN (BUILT_IN_LRINT
):
359 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
360 CASE_FLT_FN (BUILT_IN_RINT
):
361 return !flag_rounding_math
;
369 /* Check whether we may negate an integer constant T without causing
373 may_negate_without_overflow_p (const_tree t
)
377 gcc_assert (TREE_CODE (t
) == INTEGER_CST
);
379 type
= TREE_TYPE (t
);
380 if (TYPE_UNSIGNED (type
))
383 return !wi::only_sign_bit_p (t
);
386 /* Determine whether an expression T can be cheaply negated using
387 the function negate_expr without introducing undefined overflow. */
390 negate_expr_p (tree t
)
397 type
= TREE_TYPE (t
);
400 switch (TREE_CODE (t
))
403 if (INTEGRAL_TYPE_P (type
) && TYPE_OVERFLOW_WRAPS (type
))
406 /* Check that -CST will not overflow type. */
407 return may_negate_without_overflow_p (t
);
409 return (INTEGRAL_TYPE_P (type
)
410 && TYPE_OVERFLOW_WRAPS (type
));
416 return !TYPE_OVERFLOW_SANITIZED (type
);
419 /* We want to canonicalize to positive real constants. Pretend
420 that only negative ones can be easily negated. */
421 return REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
424 return negate_expr_p (TREE_REALPART (t
))
425 && negate_expr_p (TREE_IMAGPART (t
));
429 if (FLOAT_TYPE_P (TREE_TYPE (type
)) || TYPE_OVERFLOW_WRAPS (type
))
432 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
434 for (i
= 0; i
< count
; i
++)
435 if (!negate_expr_p (VECTOR_CST_ELT (t
, i
)))
442 return negate_expr_p (TREE_OPERAND (t
, 0))
443 && negate_expr_p (TREE_OPERAND (t
, 1));
446 return negate_expr_p (TREE_OPERAND (t
, 0));
449 if (HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
450 || HONOR_SIGNED_ZEROS (element_mode (type
)))
452 /* -(A + B) -> (-B) - A. */
453 if (negate_expr_p (TREE_OPERAND (t
, 1))
454 && reorder_operands_p (TREE_OPERAND (t
, 0),
455 TREE_OPERAND (t
, 1)))
457 /* -(A + B) -> (-A) - B. */
458 return negate_expr_p (TREE_OPERAND (t
, 0));
461 /* We can't turn -(A-B) into B-A when we honor signed zeros. */
462 return !HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
463 && !HONOR_SIGNED_ZEROS (element_mode (type
))
464 && reorder_operands_p (TREE_OPERAND (t
, 0),
465 TREE_OPERAND (t
, 1));
468 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
474 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (TREE_TYPE (t
))))
475 return negate_expr_p (TREE_OPERAND (t
, 1))
476 || negate_expr_p (TREE_OPERAND (t
, 0));
482 /* In general we can't negate A / B, because if A is INT_MIN and
483 B is 1, we may turn this into INT_MIN / -1 which is undefined
484 and actually traps on some architectures. But if overflow is
485 undefined, we can negate, because - (INT_MIN / 1) is an
487 if (INTEGRAL_TYPE_P (TREE_TYPE (t
)))
489 if (!TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (t
)))
491 /* If overflow is undefined then we have to be careful because
492 we ask whether it's ok to associate the negate with the
493 division which is not ok for example for
494 -((a - b) / c) where (-(a - b)) / c may invoke undefined
495 overflow because of negating INT_MIN. So do not use
496 negate_expr_p here but open-code the two important cases. */
497 if (TREE_CODE (TREE_OPERAND (t
, 0)) == NEGATE_EXPR
498 || (TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
499 && may_negate_without_overflow_p (TREE_OPERAND (t
, 0))))
502 else if (negate_expr_p (TREE_OPERAND (t
, 0)))
504 return negate_expr_p (TREE_OPERAND (t
, 1));
507 /* Negate -((double)float) as (double)(-float). */
508 if (TREE_CODE (type
) == REAL_TYPE
)
510 tree tem
= strip_float_extensions (t
);
512 return negate_expr_p (tem
);
517 /* Negate -f(x) as f(-x). */
518 if (negate_mathfn_p (builtin_mathfn_code (t
)))
519 return negate_expr_p (CALL_EXPR_ARG (t
, 0));
523 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
524 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
526 tree op1
= TREE_OPERAND (t
, 1);
527 if (wi::eq_p (op1
, TYPE_PRECISION (type
) - 1))
538 /* Given T, an expression, return a folded tree for -T or NULL_TREE, if no
539 simplification is possible.
540 If negate_expr_p would return true for T, NULL_TREE will never be
544 fold_negate_expr (location_t loc
, tree t
)
546 tree type
= TREE_TYPE (t
);
549 switch (TREE_CODE (t
))
551 /* Convert - (~A) to A + 1. */
553 if (INTEGRAL_TYPE_P (type
))
554 return fold_build2_loc (loc
, PLUS_EXPR
, type
, TREE_OPERAND (t
, 0),
555 build_one_cst (type
));
559 tem
= fold_negate_const (t
, type
);
560 if (TREE_OVERFLOW (tem
) == TREE_OVERFLOW (t
)
561 || (ANY_INTEGRAL_TYPE_P (type
)
562 && !TYPE_OVERFLOW_TRAPS (type
)
563 && TYPE_OVERFLOW_WRAPS (type
))
564 || (flag_sanitize
& SANITIZE_SI_OVERFLOW
) == 0)
569 tem
= fold_negate_const (t
, type
);
573 tem
= fold_negate_const (t
, type
);
578 tree rpart
= fold_negate_expr (loc
, TREE_REALPART (t
));
579 tree ipart
= fold_negate_expr (loc
, TREE_IMAGPART (t
));
581 return build_complex (type
, rpart
, ipart
);
587 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
588 tree
*elts
= XALLOCAVEC (tree
, count
);
590 for (i
= 0; i
< count
; i
++)
592 elts
[i
] = fold_negate_expr (loc
, VECTOR_CST_ELT (t
, i
));
593 if (elts
[i
] == NULL_TREE
)
597 return build_vector (type
, elts
);
601 if (negate_expr_p (t
))
602 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
603 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)),
604 fold_negate_expr (loc
, TREE_OPERAND (t
, 1)));
608 if (negate_expr_p (t
))
609 return fold_build1_loc (loc
, CONJ_EXPR
, type
,
610 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)));
614 if (!TYPE_OVERFLOW_SANITIZED (type
))
615 return TREE_OPERAND (t
, 0);
619 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
620 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
622 /* -(A + B) -> (-B) - A. */
623 if (negate_expr_p (TREE_OPERAND (t
, 1))
624 && reorder_operands_p (TREE_OPERAND (t
, 0),
625 TREE_OPERAND (t
, 1)))
627 tem
= negate_expr (TREE_OPERAND (t
, 1));
628 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
629 tem
, TREE_OPERAND (t
, 0));
632 /* -(A + B) -> (-A) - B. */
633 if (negate_expr_p (TREE_OPERAND (t
, 0)))
635 tem
= negate_expr (TREE_OPERAND (t
, 0));
636 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
637 tem
, TREE_OPERAND (t
, 1));
643 /* - (A - B) -> B - A */
644 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
645 && !HONOR_SIGNED_ZEROS (element_mode (type
))
646 && reorder_operands_p (TREE_OPERAND (t
, 0), TREE_OPERAND (t
, 1)))
647 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
648 TREE_OPERAND (t
, 1), TREE_OPERAND (t
, 0));
652 if (TYPE_UNSIGNED (type
))
658 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
)))
660 tem
= TREE_OPERAND (t
, 1);
661 if (negate_expr_p (tem
))
662 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
663 TREE_OPERAND (t
, 0), negate_expr (tem
));
664 tem
= TREE_OPERAND (t
, 0);
665 if (negate_expr_p (tem
))
666 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
667 negate_expr (tem
), TREE_OPERAND (t
, 1));
674 /* In general we can't negate A / B, because if A is INT_MIN and
675 B is 1, we may turn this into INT_MIN / -1 which is undefined
676 and actually traps on some architectures. But if overflow is
677 undefined, we can negate, because - (INT_MIN / 1) is an
679 if (!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
681 const char * const warnmsg
= G_("assuming signed overflow does not "
682 "occur when negating a division");
683 tem
= TREE_OPERAND (t
, 1);
684 if (negate_expr_p (tem
))
686 if (INTEGRAL_TYPE_P (type
)
687 && (TREE_CODE (tem
) != INTEGER_CST
688 || integer_onep (tem
)))
689 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MISC
);
690 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
691 TREE_OPERAND (t
, 0), negate_expr (tem
));
693 /* If overflow is undefined then we have to be careful because
694 we ask whether it's ok to associate the negate with the
695 division which is not ok for example for
696 -((a - b) / c) where (-(a - b)) / c may invoke undefined
697 overflow because of negating INT_MIN. So do not use
698 negate_expr_p here but open-code the two important cases. */
699 tem
= TREE_OPERAND (t
, 0);
700 if ((INTEGRAL_TYPE_P (type
)
701 && (TREE_CODE (tem
) == NEGATE_EXPR
702 || (TREE_CODE (tem
) == INTEGER_CST
703 && may_negate_without_overflow_p (tem
))))
704 || !INTEGRAL_TYPE_P (type
))
705 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
706 negate_expr (tem
), TREE_OPERAND (t
, 1));
711 /* Convert -((double)float) into (double)(-float). */
712 if (TREE_CODE (type
) == REAL_TYPE
)
714 tem
= strip_float_extensions (t
);
715 if (tem
!= t
&& negate_expr_p (tem
))
716 return fold_convert_loc (loc
, type
, negate_expr (tem
));
721 /* Negate -f(x) as f(-x). */
722 if (negate_mathfn_p (builtin_mathfn_code (t
))
723 && negate_expr_p (CALL_EXPR_ARG (t
, 0)))
727 fndecl
= get_callee_fndecl (t
);
728 arg
= negate_expr (CALL_EXPR_ARG (t
, 0));
729 return build_call_expr_loc (loc
, fndecl
, 1, arg
);
734 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
735 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
737 tree op1
= TREE_OPERAND (t
, 1);
738 if (wi::eq_p (op1
, TYPE_PRECISION (type
) - 1))
740 tree ntype
= TYPE_UNSIGNED (type
)
741 ? signed_type_for (type
)
742 : unsigned_type_for (type
);
743 tree temp
= fold_convert_loc (loc
, ntype
, TREE_OPERAND (t
, 0));
744 temp
= fold_build2_loc (loc
, RSHIFT_EXPR
, ntype
, temp
, op1
);
745 return fold_convert_loc (loc
, type
, temp
);
757 /* Like fold_negate_expr, but return a NEGATE_EXPR tree, if T can not be
758 negated in a simpler way. Also allow for T to be NULL_TREE, in which case
770 loc
= EXPR_LOCATION (t
);
771 type
= TREE_TYPE (t
);
774 tem
= fold_negate_expr (loc
, t
);
776 tem
= build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (t
), t
);
777 return fold_convert_loc (loc
, type
, tem
);
780 /* Split a tree IN into a constant, literal and variable parts that could be
781 combined with CODE to make IN. "constant" means an expression with
782 TREE_CONSTANT but that isn't an actual constant. CODE must be a
783 commutative arithmetic operation. Store the constant part into *CONP,
784 the literal in *LITP and return the variable part. If a part isn't
785 present, set it to null. If the tree does not decompose in this way,
786 return the entire tree as the variable part and the other parts as null.
788 If CODE is PLUS_EXPR we also split trees that use MINUS_EXPR. In that
789 case, we negate an operand that was subtracted. Except if it is a
790 literal for which we use *MINUS_LITP instead.
792 If NEGATE_P is true, we are negating all of IN, again except a literal
793 for which we use *MINUS_LITP instead.
795 If IN is itself a literal or constant, return it as appropriate.
797 Note that we do not guarantee that any of the three values will be the
798 same type as IN, but they will have the same signedness and mode. */
801 split_tree (tree in
, enum tree_code code
, tree
*conp
, tree
*litp
,
802 tree
*minus_litp
, int negate_p
)
810 /* Strip any conversions that don't change the machine mode or signedness. */
811 STRIP_SIGN_NOPS (in
);
813 if (TREE_CODE (in
) == INTEGER_CST
|| TREE_CODE (in
) == REAL_CST
814 || TREE_CODE (in
) == FIXED_CST
)
816 else if (TREE_CODE (in
) == code
817 || ((! FLOAT_TYPE_P (TREE_TYPE (in
)) || flag_associative_math
)
818 && ! SAT_FIXED_POINT_TYPE_P (TREE_TYPE (in
))
819 /* We can associate addition and subtraction together (even
820 though the C standard doesn't say so) for integers because
821 the value is not affected. For reals, the value might be
822 affected, so we can't. */
823 && ((code
== PLUS_EXPR
&& TREE_CODE (in
) == MINUS_EXPR
)
824 || (code
== MINUS_EXPR
&& TREE_CODE (in
) == PLUS_EXPR
))))
826 tree op0
= TREE_OPERAND (in
, 0);
827 tree op1
= TREE_OPERAND (in
, 1);
828 int neg1_p
= TREE_CODE (in
) == MINUS_EXPR
;
829 int neg_litp_p
= 0, neg_conp_p
= 0, neg_var_p
= 0;
831 /* First see if either of the operands is a literal, then a constant. */
832 if (TREE_CODE (op0
) == INTEGER_CST
|| TREE_CODE (op0
) == REAL_CST
833 || TREE_CODE (op0
) == FIXED_CST
)
834 *litp
= op0
, op0
= 0;
835 else if (TREE_CODE (op1
) == INTEGER_CST
|| TREE_CODE (op1
) == REAL_CST
836 || TREE_CODE (op1
) == FIXED_CST
)
837 *litp
= op1
, neg_litp_p
= neg1_p
, op1
= 0;
839 if (op0
!= 0 && TREE_CONSTANT (op0
))
840 *conp
= op0
, op0
= 0;
841 else if (op1
!= 0 && TREE_CONSTANT (op1
))
842 *conp
= op1
, neg_conp_p
= neg1_p
, op1
= 0;
844 /* If we haven't dealt with either operand, this is not a case we can
845 decompose. Otherwise, VAR is either of the ones remaining, if any. */
846 if (op0
!= 0 && op1
!= 0)
851 var
= op1
, neg_var_p
= neg1_p
;
853 /* Now do any needed negations. */
855 *minus_litp
= *litp
, *litp
= 0;
857 *conp
= negate_expr (*conp
);
859 var
= negate_expr (var
);
861 else if (TREE_CODE (in
) == BIT_NOT_EXPR
862 && code
== PLUS_EXPR
)
864 /* -X - 1 is folded to ~X, undo that here. */
865 *minus_litp
= build_one_cst (TREE_TYPE (in
));
866 var
= negate_expr (TREE_OPERAND (in
, 0));
868 else if (TREE_CONSTANT (in
))
876 *minus_litp
= *litp
, *litp
= 0;
877 else if (*minus_litp
)
878 *litp
= *minus_litp
, *minus_litp
= 0;
879 *conp
= negate_expr (*conp
);
880 var
= negate_expr (var
);
886 /* Re-associate trees split by the above function. T1 and T2 are
887 either expressions to associate or null. Return the new
888 expression, if any. LOC is the location of the new expression. If
889 we build an operation, do it in TYPE and with CODE. */
892 associate_trees (location_t loc
, tree t1
, tree t2
, enum tree_code code
, tree type
)
899 /* If either input is CODE, a PLUS_EXPR, or a MINUS_EXPR, don't
900 try to fold this since we will have infinite recursion. But do
901 deal with any NEGATE_EXPRs. */
902 if (TREE_CODE (t1
) == code
|| TREE_CODE (t2
) == code
903 || TREE_CODE (t1
) == MINUS_EXPR
|| TREE_CODE (t2
) == MINUS_EXPR
)
905 if (code
== PLUS_EXPR
)
907 if (TREE_CODE (t1
) == NEGATE_EXPR
)
908 return build2_loc (loc
, MINUS_EXPR
, type
,
909 fold_convert_loc (loc
, type
, t2
),
910 fold_convert_loc (loc
, type
,
911 TREE_OPERAND (t1
, 0)));
912 else if (TREE_CODE (t2
) == NEGATE_EXPR
)
913 return build2_loc (loc
, MINUS_EXPR
, type
,
914 fold_convert_loc (loc
, type
, t1
),
915 fold_convert_loc (loc
, type
,
916 TREE_OPERAND (t2
, 0)));
917 else if (integer_zerop (t2
))
918 return fold_convert_loc (loc
, type
, t1
);
920 else if (code
== MINUS_EXPR
)
922 if (integer_zerop (t2
))
923 return fold_convert_loc (loc
, type
, t1
);
926 return build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
927 fold_convert_loc (loc
, type
, t2
));
930 return fold_build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
931 fold_convert_loc (loc
, type
, t2
));
934 /* Check whether TYPE1 and TYPE2 are equivalent integer types, suitable
935 for use in int_const_binop, size_binop and size_diffop. */
938 int_binop_types_match_p (enum tree_code code
, const_tree type1
, const_tree type2
)
940 if (!INTEGRAL_TYPE_P (type1
) && !POINTER_TYPE_P (type1
))
942 if (!INTEGRAL_TYPE_P (type2
) && !POINTER_TYPE_P (type2
))
957 return TYPE_UNSIGNED (type1
) == TYPE_UNSIGNED (type2
)
958 && TYPE_PRECISION (type1
) == TYPE_PRECISION (type2
)
959 && TYPE_MODE (type1
) == TYPE_MODE (type2
);
963 /* Combine two integer constants ARG1 and ARG2 under operation CODE
964 to produce a new constant. Return NULL_TREE if we don't know how
965 to evaluate CODE at compile-time. */
968 int_const_binop_1 (enum tree_code code
, const_tree arg1
, const_tree parg2
,
973 tree type
= TREE_TYPE (arg1
);
974 signop sign
= TYPE_SIGN (type
);
975 bool overflow
= false;
977 wide_int arg2
= wide_int::from (parg2
, TYPE_PRECISION (type
),
978 TYPE_SIGN (TREE_TYPE (parg2
)));
983 res
= wi::bit_or (arg1
, arg2
);
987 res
= wi::bit_xor (arg1
, arg2
);
991 res
= wi::bit_and (arg1
, arg2
);
996 if (wi::neg_p (arg2
))
999 if (code
== RSHIFT_EXPR
)
1005 if (code
== RSHIFT_EXPR
)
1006 /* It's unclear from the C standard whether shifts can overflow.
1007 The following code ignores overflow; perhaps a C standard
1008 interpretation ruling is needed. */
1009 res
= wi::rshift (arg1
, arg2
, sign
);
1011 res
= wi::lshift (arg1
, arg2
);
1016 if (wi::neg_p (arg2
))
1019 if (code
== RROTATE_EXPR
)
1020 code
= LROTATE_EXPR
;
1022 code
= RROTATE_EXPR
;
1025 if (code
== RROTATE_EXPR
)
1026 res
= wi::rrotate (arg1
, arg2
);
1028 res
= wi::lrotate (arg1
, arg2
);
1032 res
= wi::add (arg1
, arg2
, sign
, &overflow
);
1036 res
= wi::sub (arg1
, arg2
, sign
, &overflow
);
1040 res
= wi::mul (arg1
, arg2
, sign
, &overflow
);
1043 case MULT_HIGHPART_EXPR
:
1044 res
= wi::mul_high (arg1
, arg2
, sign
);
1047 case TRUNC_DIV_EXPR
:
1048 case EXACT_DIV_EXPR
:
1051 res
= wi::div_trunc (arg1
, arg2
, sign
, &overflow
);
1054 case FLOOR_DIV_EXPR
:
1057 res
= wi::div_floor (arg1
, arg2
, sign
, &overflow
);
1063 res
= wi::div_ceil (arg1
, arg2
, sign
, &overflow
);
1066 case ROUND_DIV_EXPR
:
1069 res
= wi::div_round (arg1
, arg2
, sign
, &overflow
);
1072 case TRUNC_MOD_EXPR
:
1075 res
= wi::mod_trunc (arg1
, arg2
, sign
, &overflow
);
1078 case FLOOR_MOD_EXPR
:
1081 res
= wi::mod_floor (arg1
, arg2
, sign
, &overflow
);
1087 res
= wi::mod_ceil (arg1
, arg2
, sign
, &overflow
);
1090 case ROUND_MOD_EXPR
:
1093 res
= wi::mod_round (arg1
, arg2
, sign
, &overflow
);
1097 res
= wi::min (arg1
, arg2
, sign
);
1101 res
= wi::max (arg1
, arg2
, sign
);
1108 t
= force_fit_type (type
, res
, overflowable
,
1109 (((sign
== SIGNED
|| overflowable
== -1)
1111 | TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (parg2
)));
1117 int_const_binop (enum tree_code code
, const_tree arg1
, const_tree arg2
)
1119 return int_const_binop_1 (code
, arg1
, arg2
, 1);
1122 /* Combine two constants ARG1 and ARG2 under operation CODE to produce a new
1123 constant. We assume ARG1 and ARG2 have the same data type, or at least
1124 are the same kind of constant and the same machine mode. Return zero if
1125 combining the constants is not allowed in the current operating mode. */
1128 const_binop (enum tree_code code
, tree arg1
, tree arg2
)
1130 /* Sanity check for the recursive cases. */
1137 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg2
) == INTEGER_CST
)
1139 if (code
== POINTER_PLUS_EXPR
)
1140 return int_const_binop (PLUS_EXPR
,
1141 arg1
, fold_convert (TREE_TYPE (arg1
), arg2
));
1143 return int_const_binop (code
, arg1
, arg2
);
1146 if (TREE_CODE (arg1
) == REAL_CST
&& TREE_CODE (arg2
) == REAL_CST
)
1151 REAL_VALUE_TYPE value
;
1152 REAL_VALUE_TYPE result
;
1156 /* The following codes are handled by real_arithmetic. */
1171 d1
= TREE_REAL_CST (arg1
);
1172 d2
= TREE_REAL_CST (arg2
);
1174 type
= TREE_TYPE (arg1
);
1175 mode
= TYPE_MODE (type
);
1177 /* Don't perform operation if we honor signaling NaNs and
1178 either operand is a NaN. */
1179 if (HONOR_SNANS (mode
)
1180 && (REAL_VALUE_ISNAN (d1
) || REAL_VALUE_ISNAN (d2
)))
1183 /* Don't perform operation if it would raise a division
1184 by zero exception. */
1185 if (code
== RDIV_EXPR
1186 && REAL_VALUES_EQUAL (d2
, dconst0
)
1187 && (flag_trapping_math
|| ! MODE_HAS_INFINITIES (mode
)))
1190 /* If either operand is a NaN, just return it. Otherwise, set up
1191 for floating-point trap; we return an overflow. */
1192 if (REAL_VALUE_ISNAN (d1
))
1194 else if (REAL_VALUE_ISNAN (d2
))
1197 inexact
= real_arithmetic (&value
, code
, &d1
, &d2
);
1198 real_convert (&result
, mode
, &value
);
1200 /* Don't constant fold this floating point operation if
1201 the result has overflowed and flag_trapping_math. */
1202 if (flag_trapping_math
1203 && MODE_HAS_INFINITIES (mode
)
1204 && REAL_VALUE_ISINF (result
)
1205 && !REAL_VALUE_ISINF (d1
)
1206 && !REAL_VALUE_ISINF (d2
))
1209 /* Don't constant fold this floating point operation if the
1210 result may dependent upon the run-time rounding mode and
1211 flag_rounding_math is set, or if GCC's software emulation
1212 is unable to accurately represent the result. */
1213 if ((flag_rounding_math
1214 || (MODE_COMPOSITE_P (mode
) && !flag_unsafe_math_optimizations
))
1215 && (inexact
|| !real_identical (&result
, &value
)))
1218 t
= build_real (type
, result
);
1220 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
);
1224 if (TREE_CODE (arg1
) == FIXED_CST
)
1226 FIXED_VALUE_TYPE f1
;
1227 FIXED_VALUE_TYPE f2
;
1228 FIXED_VALUE_TYPE result
;
1233 /* The following codes are handled by fixed_arithmetic. */
1239 case TRUNC_DIV_EXPR
:
1240 if (TREE_CODE (arg2
) != FIXED_CST
)
1242 f2
= TREE_FIXED_CST (arg2
);
1248 if (TREE_CODE (arg2
) != INTEGER_CST
)
1251 f2
.data
.high
= w2
.elt (1);
1252 f2
.data
.low
= w2
.elt (0);
1261 f1
= TREE_FIXED_CST (arg1
);
1262 type
= TREE_TYPE (arg1
);
1263 sat_p
= TYPE_SATURATING (type
);
1264 overflow_p
= fixed_arithmetic (&result
, code
, &f1
, &f2
, sat_p
);
1265 t
= build_fixed (type
, result
);
1266 /* Propagate overflow flags. */
1267 if (overflow_p
| TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
))
1268 TREE_OVERFLOW (t
) = 1;
1272 if (TREE_CODE (arg1
) == COMPLEX_CST
&& TREE_CODE (arg2
) == COMPLEX_CST
)
1274 tree type
= TREE_TYPE (arg1
);
1275 tree r1
= TREE_REALPART (arg1
);
1276 tree i1
= TREE_IMAGPART (arg1
);
1277 tree r2
= TREE_REALPART (arg2
);
1278 tree i2
= TREE_IMAGPART (arg2
);
1285 real
= const_binop (code
, r1
, r2
);
1286 imag
= const_binop (code
, i1
, i2
);
1290 if (COMPLEX_FLOAT_TYPE_P (type
))
1291 return do_mpc_arg2 (arg1
, arg2
, type
,
1292 /* do_nonfinite= */ folding_initializer
,
1295 real
= const_binop (MINUS_EXPR
,
1296 const_binop (MULT_EXPR
, r1
, r2
),
1297 const_binop (MULT_EXPR
, i1
, i2
));
1298 imag
= const_binop (PLUS_EXPR
,
1299 const_binop (MULT_EXPR
, r1
, i2
),
1300 const_binop (MULT_EXPR
, i1
, r2
));
1304 if (COMPLEX_FLOAT_TYPE_P (type
))
1305 return do_mpc_arg2 (arg1
, arg2
, type
,
1306 /* do_nonfinite= */ folding_initializer
,
1309 case TRUNC_DIV_EXPR
:
1311 case FLOOR_DIV_EXPR
:
1312 case ROUND_DIV_EXPR
:
1313 if (flag_complex_method
== 0)
1315 /* Keep this algorithm in sync with
1316 tree-complex.c:expand_complex_div_straight().
1318 Expand complex division to scalars, straightforward algorithm.
1319 a / b = ((ar*br + ai*bi)/t) + i((ai*br - ar*bi)/t)
1323 = const_binop (PLUS_EXPR
,
1324 const_binop (MULT_EXPR
, r2
, r2
),
1325 const_binop (MULT_EXPR
, i2
, i2
));
1327 = const_binop (PLUS_EXPR
,
1328 const_binop (MULT_EXPR
, r1
, r2
),
1329 const_binop (MULT_EXPR
, i1
, i2
));
1331 = const_binop (MINUS_EXPR
,
1332 const_binop (MULT_EXPR
, i1
, r2
),
1333 const_binop (MULT_EXPR
, r1
, i2
));
1335 real
= const_binop (code
, t1
, magsquared
);
1336 imag
= const_binop (code
, t2
, magsquared
);
1340 /* Keep this algorithm in sync with
1341 tree-complex.c:expand_complex_div_wide().
1343 Expand complex division to scalars, modified algorithm to minimize
1344 overflow with wide input ranges. */
1345 tree compare
= fold_build2 (LT_EXPR
, boolean_type_node
,
1346 fold_abs_const (r2
, TREE_TYPE (type
)),
1347 fold_abs_const (i2
, TREE_TYPE (type
)));
1349 if (integer_nonzerop (compare
))
1351 /* In the TRUE branch, we compute
1353 div = (br * ratio) + bi;
1354 tr = (ar * ratio) + ai;
1355 ti = (ai * ratio) - ar;
1358 tree ratio
= const_binop (code
, r2
, i2
);
1359 tree div
= const_binop (PLUS_EXPR
, i2
,
1360 const_binop (MULT_EXPR
, r2
, ratio
));
1361 real
= const_binop (MULT_EXPR
, r1
, ratio
);
1362 real
= const_binop (PLUS_EXPR
, real
, i1
);
1363 real
= const_binop (code
, real
, div
);
1365 imag
= const_binop (MULT_EXPR
, i1
, ratio
);
1366 imag
= const_binop (MINUS_EXPR
, imag
, r1
);
1367 imag
= const_binop (code
, imag
, div
);
1371 /* In the FALSE branch, we compute
1373 divisor = (d * ratio) + c;
1374 tr = (b * ratio) + a;
1375 ti = b - (a * ratio);
1378 tree ratio
= const_binop (code
, i2
, r2
);
1379 tree div
= const_binop (PLUS_EXPR
, r2
,
1380 const_binop (MULT_EXPR
, i2
, ratio
));
1382 real
= const_binop (MULT_EXPR
, i1
, ratio
);
1383 real
= const_binop (PLUS_EXPR
, real
, r1
);
1384 real
= const_binop (code
, real
, div
);
1386 imag
= const_binop (MULT_EXPR
, r1
, ratio
);
1387 imag
= const_binop (MINUS_EXPR
, i1
, imag
);
1388 imag
= const_binop (code
, imag
, div
);
1398 return build_complex (type
, real
, imag
);
1401 if (TREE_CODE (arg1
) == VECTOR_CST
1402 && TREE_CODE (arg2
) == VECTOR_CST
)
1404 tree type
= TREE_TYPE (arg1
);
1405 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
1406 tree
*elts
= XALLOCAVEC (tree
, count
);
1408 for (i
= 0; i
< count
; i
++)
1410 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1411 tree elem2
= VECTOR_CST_ELT (arg2
, i
);
1413 elts
[i
] = const_binop (code
, elem1
, elem2
);
1415 /* It is possible that const_binop cannot handle the given
1416 code and return NULL_TREE */
1417 if (elts
[i
] == NULL_TREE
)
1421 return build_vector (type
, elts
);
1424 /* Shifts allow a scalar offset for a vector. */
1425 if (TREE_CODE (arg1
) == VECTOR_CST
1426 && TREE_CODE (arg2
) == INTEGER_CST
)
1428 tree type
= TREE_TYPE (arg1
);
1429 int count
= TYPE_VECTOR_SUBPARTS (type
), i
;
1430 tree
*elts
= XALLOCAVEC (tree
, count
);
1432 for (i
= 0; i
< count
; i
++)
1434 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1436 elts
[i
] = const_binop (code
, elem1
, arg2
);
1438 /* It is possible that const_binop cannot handle the given
1439 code and return NULL_TREE. */
1440 if (elts
[i
] == NULL_TREE
)
1444 return build_vector (type
, elts
);
1449 /* Overload that adds a TYPE parameter to be able to dispatch
1450 to fold_relational_const. */
1453 const_binop (enum tree_code code
, tree type
, tree arg1
, tree arg2
)
1455 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
1456 return fold_relational_const (code
, type
, arg1
, arg2
);
1458 /* ??? Until we make the const_binop worker take the type of the
1459 result as argument put those cases that need it here. */
1463 if ((TREE_CODE (arg1
) == REAL_CST
1464 && TREE_CODE (arg2
) == REAL_CST
)
1465 || (TREE_CODE (arg1
) == INTEGER_CST
1466 && TREE_CODE (arg2
) == INTEGER_CST
))
1467 return build_complex (type
, arg1
, arg2
);
1470 case VEC_PACK_TRUNC_EXPR
:
1471 case VEC_PACK_FIX_TRUNC_EXPR
:
1473 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
1476 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
/ 2
1477 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
)) == nelts
/ 2);
1478 if (TREE_CODE (arg1
) != VECTOR_CST
1479 || TREE_CODE (arg2
) != VECTOR_CST
)
1482 elts
= XALLOCAVEC (tree
, nelts
);
1483 if (!vec_cst_ctor_to_array (arg1
, elts
)
1484 || !vec_cst_ctor_to_array (arg2
, elts
+ nelts
/ 2))
1487 for (i
= 0; i
< nelts
; i
++)
1489 elts
[i
] = fold_convert_const (code
== VEC_PACK_TRUNC_EXPR
1490 ? NOP_EXPR
: FIX_TRUNC_EXPR
,
1491 TREE_TYPE (type
), elts
[i
]);
1492 if (elts
[i
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[i
]))
1496 return build_vector (type
, elts
);
1499 case VEC_WIDEN_MULT_LO_EXPR
:
1500 case VEC_WIDEN_MULT_HI_EXPR
:
1501 case VEC_WIDEN_MULT_EVEN_EXPR
:
1502 case VEC_WIDEN_MULT_ODD_EXPR
:
1504 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
);
1505 unsigned int out
, ofs
, scale
;
1508 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
* 2
1509 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
)) == nelts
* 2);
1510 if (TREE_CODE (arg1
) != VECTOR_CST
|| TREE_CODE (arg2
) != VECTOR_CST
)
1513 elts
= XALLOCAVEC (tree
, nelts
* 4);
1514 if (!vec_cst_ctor_to_array (arg1
, elts
)
1515 || !vec_cst_ctor_to_array (arg2
, elts
+ nelts
* 2))
1518 if (code
== VEC_WIDEN_MULT_LO_EXPR
)
1519 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? nelts
: 0;
1520 else if (code
== VEC_WIDEN_MULT_HI_EXPR
)
1521 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? 0 : nelts
;
1522 else if (code
== VEC_WIDEN_MULT_EVEN_EXPR
)
1524 else /* if (code == VEC_WIDEN_MULT_ODD_EXPR) */
1527 for (out
= 0; out
< nelts
; out
++)
1529 unsigned int in1
= (out
<< scale
) + ofs
;
1530 unsigned int in2
= in1
+ nelts
* 2;
1533 t1
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), elts
[in1
]);
1534 t2
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), elts
[in2
]);
1536 if (t1
== NULL_TREE
|| t2
== NULL_TREE
)
1538 elts
[out
] = const_binop (MULT_EXPR
, t1
, t2
);
1539 if (elts
[out
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[out
]))
1543 return build_vector (type
, elts
);
1549 if (TREE_CODE_CLASS (code
) != tcc_binary
)
1552 /* Make sure type and arg0 have the same saturating flag. */
1553 gcc_checking_assert (TYPE_SATURATING (type
)
1554 == TYPE_SATURATING (TREE_TYPE (arg1
)));
1556 return const_binop (code
, arg1
, arg2
);
1559 /* Compute CODE ARG1 with resulting type TYPE with ARG1 being constant.
1560 Return zero if computing the constants is not possible. */
1563 const_unop (enum tree_code code
, tree type
, tree arg0
)
1569 case FIX_TRUNC_EXPR
:
1570 case FIXED_CONVERT_EXPR
:
1571 return fold_convert_const (code
, type
, arg0
);
1573 case ADDR_SPACE_CONVERT_EXPR
:
1574 if (integer_zerop (arg0
))
1575 return fold_convert_const (code
, type
, arg0
);
1578 case VIEW_CONVERT_EXPR
:
1579 return fold_view_convert_expr (type
, arg0
);
1583 /* Can't call fold_negate_const directly here as that doesn't
1584 handle all cases and we might not be able to negate some
1586 tree tem
= fold_negate_expr (UNKNOWN_LOCATION
, arg0
);
1587 if (tem
&& CONSTANT_CLASS_P (tem
))
1593 if (TREE_CODE (arg0
) == INTEGER_CST
|| TREE_CODE (arg0
) == REAL_CST
)
1594 return fold_abs_const (arg0
, type
);
1598 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1600 tree ipart
= fold_negate_const (TREE_IMAGPART (arg0
),
1602 return build_complex (type
, TREE_REALPART (arg0
), ipart
);
1607 if (TREE_CODE (arg0
) == INTEGER_CST
)
1608 return fold_not_const (arg0
, type
);
1609 /* Perform BIT_NOT_EXPR on each element individually. */
1610 else if (TREE_CODE (arg0
) == VECTOR_CST
)
1614 unsigned count
= VECTOR_CST_NELTS (arg0
), i
;
1616 elements
= XALLOCAVEC (tree
, count
);
1617 for (i
= 0; i
< count
; i
++)
1619 elem
= VECTOR_CST_ELT (arg0
, i
);
1620 elem
= const_unop (BIT_NOT_EXPR
, TREE_TYPE (type
), elem
);
1621 if (elem
== NULL_TREE
)
1626 return build_vector (type
, elements
);
1630 case TRUTH_NOT_EXPR
:
1631 if (TREE_CODE (arg0
) == INTEGER_CST
)
1632 return constant_boolean_node (integer_zerop (arg0
), type
);
1636 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1637 return fold_convert (type
, TREE_REALPART (arg0
));
1641 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1642 return fold_convert (type
, TREE_IMAGPART (arg0
));
1645 case VEC_UNPACK_LO_EXPR
:
1646 case VEC_UNPACK_HI_EXPR
:
1647 case VEC_UNPACK_FLOAT_LO_EXPR
:
1648 case VEC_UNPACK_FLOAT_HI_EXPR
:
1650 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
1652 enum tree_code subcode
;
1654 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)) == nelts
* 2);
1655 if (TREE_CODE (arg0
) != VECTOR_CST
)
1658 elts
= XALLOCAVEC (tree
, nelts
* 2);
1659 if (!vec_cst_ctor_to_array (arg0
, elts
))
1662 if ((!BYTES_BIG_ENDIAN
) ^ (code
== VEC_UNPACK_LO_EXPR
1663 || code
== VEC_UNPACK_FLOAT_LO_EXPR
))
1666 if (code
== VEC_UNPACK_LO_EXPR
|| code
== VEC_UNPACK_HI_EXPR
)
1669 subcode
= FLOAT_EXPR
;
1671 for (i
= 0; i
< nelts
; i
++)
1673 elts
[i
] = fold_convert_const (subcode
, TREE_TYPE (type
), elts
[i
]);
1674 if (elts
[i
] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[i
]))
1678 return build_vector (type
, elts
);
1681 case REDUC_MIN_EXPR
:
1682 case REDUC_MAX_EXPR
:
1683 case REDUC_PLUS_EXPR
:
1685 unsigned int nelts
, i
;
1687 enum tree_code subcode
;
1689 if (TREE_CODE (arg0
) != VECTOR_CST
)
1691 nelts
= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
));
1693 elts
= XALLOCAVEC (tree
, nelts
);
1694 if (!vec_cst_ctor_to_array (arg0
, elts
))
1699 case REDUC_MIN_EXPR
: subcode
= MIN_EXPR
; break;
1700 case REDUC_MAX_EXPR
: subcode
= MAX_EXPR
; break;
1701 case REDUC_PLUS_EXPR
: subcode
= PLUS_EXPR
; break;
1702 default: gcc_unreachable ();
1705 for (i
= 1; i
< nelts
; i
++)
1707 elts
[0] = const_binop (subcode
, elts
[0], elts
[i
]);
1708 if (elts
[0] == NULL_TREE
|| !CONSTANT_CLASS_P (elts
[0]))
1722 /* Create a sizetype INT_CST node with NUMBER sign extended. KIND
1723 indicates which particular sizetype to create. */
1726 size_int_kind (HOST_WIDE_INT number
, enum size_type_kind kind
)
1728 return build_int_cst (sizetype_tab
[(int) kind
], number
);
1731 /* Combine operands OP1 and OP2 with arithmetic operation CODE. CODE
1732 is a tree code. The type of the result is taken from the operands.
1733 Both must be equivalent integer types, ala int_binop_types_match_p.
1734 If the operands are constant, so is the result. */
1737 size_binop_loc (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
)
1739 tree type
= TREE_TYPE (arg0
);
1741 if (arg0
== error_mark_node
|| arg1
== error_mark_node
)
1742 return error_mark_node
;
1744 gcc_assert (int_binop_types_match_p (code
, TREE_TYPE (arg0
),
1747 /* Handle the special case of two integer constants faster. */
1748 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
1750 /* And some specific cases even faster than that. */
1751 if (code
== PLUS_EXPR
)
1753 if (integer_zerop (arg0
) && !TREE_OVERFLOW (arg0
))
1755 if (integer_zerop (arg1
) && !TREE_OVERFLOW (arg1
))
1758 else if (code
== MINUS_EXPR
)
1760 if (integer_zerop (arg1
) && !TREE_OVERFLOW (arg1
))
1763 else if (code
== MULT_EXPR
)
1765 if (integer_onep (arg0
) && !TREE_OVERFLOW (arg0
))
1769 /* Handle general case of two integer constants. For sizetype
1770 constant calculations we always want to know about overflow,
1771 even in the unsigned case. */
1772 return int_const_binop_1 (code
, arg0
, arg1
, -1);
1775 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
1778 /* Given two values, either both of sizetype or both of bitsizetype,
1779 compute the difference between the two values. Return the value
1780 in signed type corresponding to the type of the operands. */
1783 size_diffop_loc (location_t loc
, tree arg0
, tree arg1
)
1785 tree type
= TREE_TYPE (arg0
);
1788 gcc_assert (int_binop_types_match_p (MINUS_EXPR
, TREE_TYPE (arg0
),
1791 /* If the type is already signed, just do the simple thing. */
1792 if (!TYPE_UNSIGNED (type
))
1793 return size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
);
1795 if (type
== sizetype
)
1797 else if (type
== bitsizetype
)
1798 ctype
= sbitsizetype
;
1800 ctype
= signed_type_for (type
);
1802 /* If either operand is not a constant, do the conversions to the signed
1803 type and subtract. The hardware will do the right thing with any
1804 overflow in the subtraction. */
1805 if (TREE_CODE (arg0
) != INTEGER_CST
|| TREE_CODE (arg1
) != INTEGER_CST
)
1806 return size_binop_loc (loc
, MINUS_EXPR
,
1807 fold_convert_loc (loc
, ctype
, arg0
),
1808 fold_convert_loc (loc
, ctype
, arg1
));
1810 /* If ARG0 is larger than ARG1, subtract and return the result in CTYPE.
1811 Otherwise, subtract the other way, convert to CTYPE (we know that can't
1812 overflow) and negate (which can't either). Special-case a result
1813 of zero while we're here. */
1814 if (tree_int_cst_equal (arg0
, arg1
))
1815 return build_int_cst (ctype
, 0);
1816 else if (tree_int_cst_lt (arg1
, arg0
))
1817 return fold_convert_loc (loc
, ctype
,
1818 size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
));
1820 return size_binop_loc (loc
, MINUS_EXPR
, build_int_cst (ctype
, 0),
1821 fold_convert_loc (loc
, ctype
,
1822 size_binop_loc (loc
,
1827 /* A subroutine of fold_convert_const handling conversions of an
1828 INTEGER_CST to another integer type. */
1831 fold_convert_const_int_from_int (tree type
, const_tree arg1
)
1833 /* Given an integer constant, make new constant with new type,
1834 appropriately sign-extended or truncated. Use widest_int
1835 so that any extension is done according ARG1's type. */
1836 return force_fit_type (type
, wi::to_widest (arg1
),
1837 !POINTER_TYPE_P (TREE_TYPE (arg1
)),
1838 TREE_OVERFLOW (arg1
));
1841 /* A subroutine of fold_convert_const handling conversions a REAL_CST
1842 to an integer type. */
1845 fold_convert_const_int_from_real (enum tree_code code
, tree type
, const_tree arg1
)
1847 bool overflow
= false;
1850 /* The following code implements the floating point to integer
1851 conversion rules required by the Java Language Specification,
1852 that IEEE NaNs are mapped to zero and values that overflow
1853 the target precision saturate, i.e. values greater than
1854 INT_MAX are mapped to INT_MAX, and values less than INT_MIN
1855 are mapped to INT_MIN. These semantics are allowed by the
1856 C and C++ standards that simply state that the behavior of
1857 FP-to-integer conversion is unspecified upon overflow. */
1861 REAL_VALUE_TYPE x
= TREE_REAL_CST (arg1
);
1865 case FIX_TRUNC_EXPR
:
1866 real_trunc (&r
, VOIDmode
, &x
);
1873 /* If R is NaN, return zero and show we have an overflow. */
1874 if (REAL_VALUE_ISNAN (r
))
1877 val
= wi::zero (TYPE_PRECISION (type
));
1880 /* See if R is less than the lower bound or greater than the
1885 tree lt
= TYPE_MIN_VALUE (type
);
1886 REAL_VALUE_TYPE l
= real_value_from_int_cst (NULL_TREE
, lt
);
1887 if (REAL_VALUES_LESS (r
, l
))
1896 tree ut
= TYPE_MAX_VALUE (type
);
1899 REAL_VALUE_TYPE u
= real_value_from_int_cst (NULL_TREE
, ut
);
1900 if (REAL_VALUES_LESS (u
, r
))
1909 val
= real_to_integer (&r
, &overflow
, TYPE_PRECISION (type
));
1911 t
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (arg1
));
1915 /* A subroutine of fold_convert_const handling conversions of a
1916 FIXED_CST to an integer type. */
1919 fold_convert_const_int_from_fixed (tree type
, const_tree arg1
)
1922 double_int temp
, temp_trunc
;
1925 /* Right shift FIXED_CST to temp by fbit. */
1926 temp
= TREE_FIXED_CST (arg1
).data
;
1927 mode
= TREE_FIXED_CST (arg1
).mode
;
1928 if (GET_MODE_FBIT (mode
) < HOST_BITS_PER_DOUBLE_INT
)
1930 temp
= temp
.rshift (GET_MODE_FBIT (mode
),
1931 HOST_BITS_PER_DOUBLE_INT
,
1932 SIGNED_FIXED_POINT_MODE_P (mode
));
1934 /* Left shift temp to temp_trunc by fbit. */
1935 temp_trunc
= temp
.lshift (GET_MODE_FBIT (mode
),
1936 HOST_BITS_PER_DOUBLE_INT
,
1937 SIGNED_FIXED_POINT_MODE_P (mode
));
1941 temp
= double_int_zero
;
1942 temp_trunc
= double_int_zero
;
1945 /* If FIXED_CST is negative, we need to round the value toward 0.
1946 By checking if the fractional bits are not zero to add 1 to temp. */
1947 if (SIGNED_FIXED_POINT_MODE_P (mode
)
1948 && temp_trunc
.is_negative ()
1949 && TREE_FIXED_CST (arg1
).data
!= temp_trunc
)
1950 temp
+= double_int_one
;
1952 /* Given a fixed-point constant, make new constant with new type,
1953 appropriately sign-extended or truncated. */
1954 t
= force_fit_type (type
, temp
, -1,
1955 (temp
.is_negative ()
1956 && (TYPE_UNSIGNED (type
)
1957 < TYPE_UNSIGNED (TREE_TYPE (arg1
))))
1958 | TREE_OVERFLOW (arg1
));
1963 /* A subroutine of fold_convert_const handling conversions a REAL_CST
1964 to another floating point type. */
1967 fold_convert_const_real_from_real (tree type
, const_tree arg1
)
1969 REAL_VALUE_TYPE value
;
1972 real_convert (&value
, TYPE_MODE (type
), &TREE_REAL_CST (arg1
));
1973 t
= build_real (type
, value
);
1975 /* If converting an infinity or NAN to a representation that doesn't
1976 have one, set the overflow bit so that we can produce some kind of
1977 error message at the appropriate point if necessary. It's not the
1978 most user-friendly message, but it's better than nothing. */
1979 if (REAL_VALUE_ISINF (TREE_REAL_CST (arg1
))
1980 && !MODE_HAS_INFINITIES (TYPE_MODE (type
)))
1981 TREE_OVERFLOW (t
) = 1;
1982 else if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1
))
1983 && !MODE_HAS_NANS (TYPE_MODE (type
)))
1984 TREE_OVERFLOW (t
) = 1;
1985 /* Regular overflow, conversion produced an infinity in a mode that
1986 can't represent them. */
1987 else if (!MODE_HAS_INFINITIES (TYPE_MODE (type
))
1988 && REAL_VALUE_ISINF (value
)
1989 && !REAL_VALUE_ISINF (TREE_REAL_CST (arg1
)))
1990 TREE_OVERFLOW (t
) = 1;
1992 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
1996 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
1997 to a floating point type. */
2000 fold_convert_const_real_from_fixed (tree type
, const_tree arg1
)
2002 REAL_VALUE_TYPE value
;
2005 real_convert_from_fixed (&value
, TYPE_MODE (type
), &TREE_FIXED_CST (arg1
));
2006 t
= build_real (type
, value
);
2008 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2012 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2013 to another fixed-point type. */
2016 fold_convert_const_fixed_from_fixed (tree type
, const_tree arg1
)
2018 FIXED_VALUE_TYPE value
;
2022 overflow_p
= fixed_convert (&value
, TYPE_MODE (type
), &TREE_FIXED_CST (arg1
),
2023 TYPE_SATURATING (type
));
2024 t
= build_fixed (type
, value
);
2026 /* Propagate overflow flags. */
2027 if (overflow_p
| TREE_OVERFLOW (arg1
))
2028 TREE_OVERFLOW (t
) = 1;
2032 /* A subroutine of fold_convert_const handling conversions an INTEGER_CST
2033 to a fixed-point type. */
2036 fold_convert_const_fixed_from_int (tree type
, const_tree arg1
)
2038 FIXED_VALUE_TYPE value
;
2043 gcc_assert (TREE_INT_CST_NUNITS (arg1
) <= 2);
2045 di
.low
= TREE_INT_CST_ELT (arg1
, 0);
2046 if (TREE_INT_CST_NUNITS (arg1
) == 1)
2047 di
.high
= (HOST_WIDE_INT
) di
.low
< 0 ? (HOST_WIDE_INT
) -1 : 0;
2049 di
.high
= TREE_INT_CST_ELT (arg1
, 1);
2051 overflow_p
= fixed_convert_from_int (&value
, TYPE_MODE (type
), di
,
2052 TYPE_UNSIGNED (TREE_TYPE (arg1
)),
2053 TYPE_SATURATING (type
));
2054 t
= build_fixed (type
, value
);
2056 /* Propagate overflow flags. */
2057 if (overflow_p
| TREE_OVERFLOW (arg1
))
2058 TREE_OVERFLOW (t
) = 1;
2062 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2063 to a fixed-point type. */
2066 fold_convert_const_fixed_from_real (tree type
, const_tree arg1
)
2068 FIXED_VALUE_TYPE value
;
2072 overflow_p
= fixed_convert_from_real (&value
, TYPE_MODE (type
),
2073 &TREE_REAL_CST (arg1
),
2074 TYPE_SATURATING (type
));
2075 t
= build_fixed (type
, value
);
2077 /* Propagate overflow flags. */
2078 if (overflow_p
| TREE_OVERFLOW (arg1
))
2079 TREE_OVERFLOW (t
) = 1;
2083 /* Attempt to fold type conversion operation CODE of expression ARG1 to
2084 type TYPE. If no simplification can be done return NULL_TREE. */
2087 fold_convert_const (enum tree_code code
, tree type
, tree arg1
)
2089 if (TREE_TYPE (arg1
) == type
)
2092 if (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
)
2093 || TREE_CODE (type
) == OFFSET_TYPE
)
2095 if (TREE_CODE (arg1
) == INTEGER_CST
)
2096 return fold_convert_const_int_from_int (type
, arg1
);
2097 else if (TREE_CODE (arg1
) == REAL_CST
)
2098 return fold_convert_const_int_from_real (code
, type
, arg1
);
2099 else if (TREE_CODE (arg1
) == FIXED_CST
)
2100 return fold_convert_const_int_from_fixed (type
, arg1
);
2102 else if (TREE_CODE (type
) == REAL_TYPE
)
2104 if (TREE_CODE (arg1
) == INTEGER_CST
)
2105 return build_real_from_int_cst (type
, arg1
);
2106 else if (TREE_CODE (arg1
) == REAL_CST
)
2107 return fold_convert_const_real_from_real (type
, arg1
);
2108 else if (TREE_CODE (arg1
) == FIXED_CST
)
2109 return fold_convert_const_real_from_fixed (type
, arg1
);
2111 else if (TREE_CODE (type
) == FIXED_POINT_TYPE
)
2113 if (TREE_CODE (arg1
) == FIXED_CST
)
2114 return fold_convert_const_fixed_from_fixed (type
, arg1
);
2115 else if (TREE_CODE (arg1
) == INTEGER_CST
)
2116 return fold_convert_const_fixed_from_int (type
, arg1
);
2117 else if (TREE_CODE (arg1
) == REAL_CST
)
2118 return fold_convert_const_fixed_from_real (type
, arg1
);
2123 /* Construct a vector of zero elements of vector type TYPE. */
2126 build_zero_vector (tree type
)
2130 t
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), integer_zero_node
);
2131 return build_vector_from_val (type
, t
);
2134 /* Returns true, if ARG is convertible to TYPE using a NOP_EXPR. */
2137 fold_convertible_p (const_tree type
, const_tree arg
)
2139 tree orig
= TREE_TYPE (arg
);
2144 if (TREE_CODE (arg
) == ERROR_MARK
2145 || TREE_CODE (type
) == ERROR_MARK
2146 || TREE_CODE (orig
) == ERROR_MARK
)
2149 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2152 switch (TREE_CODE (type
))
2154 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2155 case POINTER_TYPE
: case REFERENCE_TYPE
:
2157 if (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2158 || TREE_CODE (orig
) == OFFSET_TYPE
)
2160 return (TREE_CODE (orig
) == VECTOR_TYPE
2161 && tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2164 case FIXED_POINT_TYPE
:
2168 return TREE_CODE (type
) == TREE_CODE (orig
);
2175 /* Convert expression ARG to type TYPE. Used by the middle-end for
2176 simple conversions in preference to calling the front-end's convert. */
2179 fold_convert_loc (location_t loc
, tree type
, tree arg
)
2181 tree orig
= TREE_TYPE (arg
);
2187 if (TREE_CODE (arg
) == ERROR_MARK
2188 || TREE_CODE (type
) == ERROR_MARK
2189 || TREE_CODE (orig
) == ERROR_MARK
)
2190 return error_mark_node
;
2192 switch (TREE_CODE (type
))
2195 case REFERENCE_TYPE
:
2196 /* Handle conversions between pointers to different address spaces. */
2197 if (POINTER_TYPE_P (orig
)
2198 && (TYPE_ADDR_SPACE (TREE_TYPE (type
))
2199 != TYPE_ADDR_SPACE (TREE_TYPE (orig
))))
2200 return fold_build1_loc (loc
, ADDR_SPACE_CONVERT_EXPR
, type
, arg
);
2203 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2205 if (TREE_CODE (arg
) == INTEGER_CST
)
2207 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2208 if (tem
!= NULL_TREE
)
2211 if (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2212 || TREE_CODE (orig
) == OFFSET_TYPE
)
2213 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2214 if (TREE_CODE (orig
) == COMPLEX_TYPE
)
2215 return fold_convert_loc (loc
, type
,
2216 fold_build1_loc (loc
, REALPART_EXPR
,
2217 TREE_TYPE (orig
), arg
));
2218 gcc_assert (TREE_CODE (orig
) == VECTOR_TYPE
2219 && tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2220 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2223 if (TREE_CODE (arg
) == INTEGER_CST
)
2225 tem
= fold_convert_const (FLOAT_EXPR
, type
, arg
);
2226 if (tem
!= NULL_TREE
)
2229 else if (TREE_CODE (arg
) == REAL_CST
)
2231 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2232 if (tem
!= NULL_TREE
)
2235 else if (TREE_CODE (arg
) == FIXED_CST
)
2237 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2238 if (tem
!= NULL_TREE
)
2242 switch (TREE_CODE (orig
))
2245 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2246 case POINTER_TYPE
: case REFERENCE_TYPE
:
2247 return fold_build1_loc (loc
, FLOAT_EXPR
, type
, arg
);
2250 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2252 case FIXED_POINT_TYPE
:
2253 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2256 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2257 return fold_convert_loc (loc
, type
, tem
);
2263 case FIXED_POINT_TYPE
:
2264 if (TREE_CODE (arg
) == FIXED_CST
|| TREE_CODE (arg
) == INTEGER_CST
2265 || TREE_CODE (arg
) == REAL_CST
)
2267 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2268 if (tem
!= NULL_TREE
)
2269 goto fold_convert_exit
;
2272 switch (TREE_CODE (orig
))
2274 case FIXED_POINT_TYPE
:
2279 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2282 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2283 return fold_convert_loc (loc
, type
, tem
);
2290 switch (TREE_CODE (orig
))
2293 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2294 case POINTER_TYPE
: case REFERENCE_TYPE
:
2296 case FIXED_POINT_TYPE
:
2297 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
2298 fold_convert_loc (loc
, TREE_TYPE (type
), arg
),
2299 fold_convert_loc (loc
, TREE_TYPE (type
),
2300 integer_zero_node
));
2305 if (TREE_CODE (arg
) == COMPLEX_EXPR
)
2307 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2308 TREE_OPERAND (arg
, 0));
2309 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2310 TREE_OPERAND (arg
, 1));
2311 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2314 arg
= save_expr (arg
);
2315 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2316 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, TREE_TYPE (orig
), arg
);
2317 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
), rpart
);
2318 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
), ipart
);
2319 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2327 if (integer_zerop (arg
))
2328 return build_zero_vector (type
);
2329 gcc_assert (tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2330 gcc_assert (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2331 || TREE_CODE (orig
) == VECTOR_TYPE
);
2332 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2335 tem
= fold_ignored_result (arg
);
2336 return fold_build1_loc (loc
, NOP_EXPR
, type
, tem
);
2339 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2340 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2344 protected_set_expr_location_unshare (tem
, loc
);
2348 /* Return false if expr can be assumed not to be an lvalue, true
2352 maybe_lvalue_p (const_tree x
)
2354 /* We only need to wrap lvalue tree codes. */
2355 switch (TREE_CODE (x
))
2368 case ARRAY_RANGE_REF
:
2374 case PREINCREMENT_EXPR
:
2375 case PREDECREMENT_EXPR
:
2377 case TRY_CATCH_EXPR
:
2378 case WITH_CLEANUP_EXPR
:
2387 /* Assume the worst for front-end tree codes. */
2388 if ((int)TREE_CODE (x
) >= NUM_TREE_CODES
)
2396 /* Return an expr equal to X but certainly not valid as an lvalue. */
2399 non_lvalue_loc (location_t loc
, tree x
)
2401 /* While we are in GIMPLE, NON_LVALUE_EXPR doesn't mean anything to
2406 if (! maybe_lvalue_p (x
))
2408 return build1_loc (loc
, NON_LVALUE_EXPR
, TREE_TYPE (x
), x
);
2411 /* When pedantic, return an expr equal to X but certainly not valid as a
2412 pedantic lvalue. Otherwise, return X. */
2415 pedantic_non_lvalue_loc (location_t loc
, tree x
)
2417 return protected_set_expr_location_unshare (x
, loc
);
2420 /* Given a tree comparison code, return the code that is the logical inverse.
2421 It is generally not safe to do this for floating-point comparisons, except
2422 for EQ_EXPR, NE_EXPR, ORDERED_EXPR and UNORDERED_EXPR, so we return
2423 ERROR_MARK in this case. */
2426 invert_tree_comparison (enum tree_code code
, bool honor_nans
)
2428 if (honor_nans
&& flag_trapping_math
&& code
!= EQ_EXPR
&& code
!= NE_EXPR
2429 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
)
2439 return honor_nans
? UNLE_EXPR
: LE_EXPR
;
2441 return honor_nans
? UNLT_EXPR
: LT_EXPR
;
2443 return honor_nans
? UNGE_EXPR
: GE_EXPR
;
2445 return honor_nans
? UNGT_EXPR
: GT_EXPR
;
2459 return UNORDERED_EXPR
;
2460 case UNORDERED_EXPR
:
2461 return ORDERED_EXPR
;
2467 /* Similar, but return the comparison that results if the operands are
2468 swapped. This is safe for floating-point. */
2471 swap_tree_comparison (enum tree_code code
)
2478 case UNORDERED_EXPR
:
2504 /* Convert a comparison tree code from an enum tree_code representation
2505 into a compcode bit-based encoding. This function is the inverse of
2506 compcode_to_comparison. */
2508 static enum comparison_code
2509 comparison_to_compcode (enum tree_code code
)
2526 return COMPCODE_ORD
;
2527 case UNORDERED_EXPR
:
2528 return COMPCODE_UNORD
;
2530 return COMPCODE_UNLT
;
2532 return COMPCODE_UNEQ
;
2534 return COMPCODE_UNLE
;
2536 return COMPCODE_UNGT
;
2538 return COMPCODE_LTGT
;
2540 return COMPCODE_UNGE
;
2546 /* Convert a compcode bit-based encoding of a comparison operator back
2547 to GCC's enum tree_code representation. This function is the
2548 inverse of comparison_to_compcode. */
2550 static enum tree_code
2551 compcode_to_comparison (enum comparison_code code
)
2568 return ORDERED_EXPR
;
2569 case COMPCODE_UNORD
:
2570 return UNORDERED_EXPR
;
2588 /* Return a tree for the comparison which is the combination of
2589 doing the AND or OR (depending on CODE) of the two operations LCODE
2590 and RCODE on the identical operands LL_ARG and LR_ARG. Take into account
2591 the possibility of trapping if the mode has NaNs, and return NULL_TREE
2592 if this makes the transformation invalid. */
2595 combine_comparisons (location_t loc
,
2596 enum tree_code code
, enum tree_code lcode
,
2597 enum tree_code rcode
, tree truth_type
,
2598 tree ll_arg
, tree lr_arg
)
2600 bool honor_nans
= HONOR_NANS (ll_arg
);
2601 enum comparison_code lcompcode
= comparison_to_compcode (lcode
);
2602 enum comparison_code rcompcode
= comparison_to_compcode (rcode
);
2607 case TRUTH_AND_EXPR
: case TRUTH_ANDIF_EXPR
:
2608 compcode
= lcompcode
& rcompcode
;
2611 case TRUTH_OR_EXPR
: case TRUTH_ORIF_EXPR
:
2612 compcode
= lcompcode
| rcompcode
;
2621 /* Eliminate unordered comparisons, as well as LTGT and ORD
2622 which are not used unless the mode has NaNs. */
2623 compcode
&= ~COMPCODE_UNORD
;
2624 if (compcode
== COMPCODE_LTGT
)
2625 compcode
= COMPCODE_NE
;
2626 else if (compcode
== COMPCODE_ORD
)
2627 compcode
= COMPCODE_TRUE
;
2629 else if (flag_trapping_math
)
2631 /* Check that the original operation and the optimized ones will trap
2632 under the same condition. */
2633 bool ltrap
= (lcompcode
& COMPCODE_UNORD
) == 0
2634 && (lcompcode
!= COMPCODE_EQ
)
2635 && (lcompcode
!= COMPCODE_ORD
);
2636 bool rtrap
= (rcompcode
& COMPCODE_UNORD
) == 0
2637 && (rcompcode
!= COMPCODE_EQ
)
2638 && (rcompcode
!= COMPCODE_ORD
);
2639 bool trap
= (compcode
& COMPCODE_UNORD
) == 0
2640 && (compcode
!= COMPCODE_EQ
)
2641 && (compcode
!= COMPCODE_ORD
);
2643 /* In a short-circuited boolean expression the LHS might be
2644 such that the RHS, if evaluated, will never trap. For
2645 example, in ORD (x, y) && (x < y), we evaluate the RHS only
2646 if neither x nor y is NaN. (This is a mixed blessing: for
2647 example, the expression above will never trap, hence
2648 optimizing it to x < y would be invalid). */
2649 if ((code
== TRUTH_ORIF_EXPR
&& (lcompcode
& COMPCODE_UNORD
))
2650 || (code
== TRUTH_ANDIF_EXPR
&& !(lcompcode
& COMPCODE_UNORD
)))
2653 /* If the comparison was short-circuited, and only the RHS
2654 trapped, we may now generate a spurious trap. */
2656 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
2659 /* If we changed the conditions that cause a trap, we lose. */
2660 if ((ltrap
|| rtrap
) != trap
)
2664 if (compcode
== COMPCODE_TRUE
)
2665 return constant_boolean_node (true, truth_type
);
2666 else if (compcode
== COMPCODE_FALSE
)
2667 return constant_boolean_node (false, truth_type
);
2670 enum tree_code tcode
;
2672 tcode
= compcode_to_comparison ((enum comparison_code
) compcode
);
2673 return fold_build2_loc (loc
, tcode
, truth_type
, ll_arg
, lr_arg
);
2677 /* Return nonzero if two operands (typically of the same tree node)
2678 are necessarily equal. If either argument has side-effects this
2679 function returns zero. FLAGS modifies behavior as follows:
2681 If OEP_ONLY_CONST is set, only return nonzero for constants.
2682 This function tests whether the operands are indistinguishable;
2683 it does not test whether they are equal using C's == operation.
2684 The distinction is important for IEEE floating point, because
2685 (1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and
2686 (2) two NaNs may be indistinguishable, but NaN!=NaN.
2688 If OEP_ONLY_CONST is unset, a VAR_DECL is considered equal to itself
2689 even though it may hold multiple values during a function.
2690 This is because a GCC tree node guarantees that nothing else is
2691 executed between the evaluation of its "operands" (which may often
2692 be evaluated in arbitrary order). Hence if the operands themselves
2693 don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the
2694 same value in each operand/subexpression. Hence leaving OEP_ONLY_CONST
2695 unset means assuming isochronic (or instantaneous) tree equivalence.
2696 Unless comparing arbitrary expression trees, such as from different
2697 statements, this flag can usually be left unset.
2699 If OEP_PURE_SAME is set, then pure functions with identical arguments
2700 are considered the same. It is used when the caller has other ways
2701 to ensure that global memory is unchanged in between. */
2704 operand_equal_p (const_tree arg0
, const_tree arg1
, unsigned int flags
)
2706 /* If either is ERROR_MARK, they aren't equal. */
2707 if (TREE_CODE (arg0
) == ERROR_MARK
|| TREE_CODE (arg1
) == ERROR_MARK
2708 || TREE_TYPE (arg0
) == error_mark_node
2709 || TREE_TYPE (arg1
) == error_mark_node
)
2712 /* Similar, if either does not have a type (like a released SSA name),
2713 they aren't equal. */
2714 if (!TREE_TYPE (arg0
) || !TREE_TYPE (arg1
))
2717 /* Check equality of integer constants before bailing out due to
2718 precision differences. */
2719 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
2720 return tree_int_cst_equal (arg0
, arg1
);
2722 /* If both types don't have the same signedness, then we can't consider
2723 them equal. We must check this before the STRIP_NOPS calls
2724 because they may change the signedness of the arguments. As pointers
2725 strictly don't have a signedness, require either two pointers or
2726 two non-pointers as well. */
2727 if (TYPE_UNSIGNED (TREE_TYPE (arg0
)) != TYPE_UNSIGNED (TREE_TYPE (arg1
))
2728 || POINTER_TYPE_P (TREE_TYPE (arg0
)) != POINTER_TYPE_P (TREE_TYPE (arg1
)))
2731 /* We cannot consider pointers to different address space equal. */
2732 if (POINTER_TYPE_P (TREE_TYPE (arg0
)) && POINTER_TYPE_P (TREE_TYPE (arg1
))
2733 && (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
)))
2734 != TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg1
)))))
2737 /* If both types don't have the same precision, then it is not safe
2739 if (element_precision (TREE_TYPE (arg0
))
2740 != element_precision (TREE_TYPE (arg1
)))
2746 /* In case both args are comparisons but with different comparison
2747 code, try to swap the comparison operands of one arg to produce
2748 a match and compare that variant. */
2749 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
2750 && COMPARISON_CLASS_P (arg0
)
2751 && COMPARISON_CLASS_P (arg1
))
2753 enum tree_code swap_code
= swap_tree_comparison (TREE_CODE (arg1
));
2755 if (TREE_CODE (arg0
) == swap_code
)
2756 return operand_equal_p (TREE_OPERAND (arg0
, 0),
2757 TREE_OPERAND (arg1
, 1), flags
)
2758 && operand_equal_p (TREE_OPERAND (arg0
, 1),
2759 TREE_OPERAND (arg1
, 0), flags
);
2762 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
2763 /* NOP_EXPR and CONVERT_EXPR are considered equal. */
2764 && !(CONVERT_EXPR_P (arg0
) && CONVERT_EXPR_P (arg1
)))
2767 /* This is needed for conversions and for COMPONENT_REF.
2768 Might as well play it safe and always test this. */
2769 if (TREE_CODE (TREE_TYPE (arg0
)) == ERROR_MARK
2770 || TREE_CODE (TREE_TYPE (arg1
)) == ERROR_MARK
2771 || TYPE_MODE (TREE_TYPE (arg0
)) != TYPE_MODE (TREE_TYPE (arg1
)))
2774 /* If ARG0 and ARG1 are the same SAVE_EXPR, they are necessarily equal.
2775 We don't care about side effects in that case because the SAVE_EXPR
2776 takes care of that for us. In all other cases, two expressions are
2777 equal if they have no side effects. If we have two identical
2778 expressions with side effects that should be treated the same due
2779 to the only side effects being identical SAVE_EXPR's, that will
2780 be detected in the recursive calls below.
2781 If we are taking an invariant address of two identical objects
2782 they are necessarily equal as well. */
2783 if (arg0
== arg1
&& ! (flags
& OEP_ONLY_CONST
)
2784 && (TREE_CODE (arg0
) == SAVE_EXPR
2785 || (flags
& OEP_CONSTANT_ADDRESS_OF
)
2786 || (! TREE_SIDE_EFFECTS (arg0
) && ! TREE_SIDE_EFFECTS (arg1
))))
2789 /* Next handle constant cases, those for which we can return 1 even
2790 if ONLY_CONST is set. */
2791 if (TREE_CONSTANT (arg0
) && TREE_CONSTANT (arg1
))
2792 switch (TREE_CODE (arg0
))
2795 return tree_int_cst_equal (arg0
, arg1
);
2798 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (arg0
),
2799 TREE_FIXED_CST (arg1
));
2802 if (REAL_VALUES_IDENTICAL (TREE_REAL_CST (arg0
),
2803 TREE_REAL_CST (arg1
)))
2807 if (!HONOR_SIGNED_ZEROS (arg0
))
2809 /* If we do not distinguish between signed and unsigned zero,
2810 consider them equal. */
2811 if (real_zerop (arg0
) && real_zerop (arg1
))
2820 if (VECTOR_CST_NELTS (arg0
) != VECTOR_CST_NELTS (arg1
))
2823 for (i
= 0; i
< VECTOR_CST_NELTS (arg0
); ++i
)
2825 if (!operand_equal_p (VECTOR_CST_ELT (arg0
, i
),
2826 VECTOR_CST_ELT (arg1
, i
), flags
))
2833 return (operand_equal_p (TREE_REALPART (arg0
), TREE_REALPART (arg1
),
2835 && operand_equal_p (TREE_IMAGPART (arg0
), TREE_IMAGPART (arg1
),
2839 return (TREE_STRING_LENGTH (arg0
) == TREE_STRING_LENGTH (arg1
)
2840 && ! memcmp (TREE_STRING_POINTER (arg0
),
2841 TREE_STRING_POINTER (arg1
),
2842 TREE_STRING_LENGTH (arg0
)));
2845 return operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 0),
2846 TREE_CONSTANT (arg0
) && TREE_CONSTANT (arg1
)
2847 ? OEP_CONSTANT_ADDRESS_OF
| OEP_ADDRESS_OF
: 0);
2852 if (flags
& OEP_ONLY_CONST
)
2855 /* Define macros to test an operand from arg0 and arg1 for equality and a
2856 variant that allows null and views null as being different from any
2857 non-null value. In the latter case, if either is null, the both
2858 must be; otherwise, do the normal comparison. */
2859 #define OP_SAME(N) operand_equal_p (TREE_OPERAND (arg0, N), \
2860 TREE_OPERAND (arg1, N), flags)
2862 #define OP_SAME_WITH_NULL(N) \
2863 ((!TREE_OPERAND (arg0, N) || !TREE_OPERAND (arg1, N)) \
2864 ? TREE_OPERAND (arg0, N) == TREE_OPERAND (arg1, N) : OP_SAME (N))
2866 switch (TREE_CODE_CLASS (TREE_CODE (arg0
)))
2869 /* Two conversions are equal only if signedness and modes match. */
2870 switch (TREE_CODE (arg0
))
2873 case FIX_TRUNC_EXPR
:
2874 if (TYPE_UNSIGNED (TREE_TYPE (arg0
))
2875 != TYPE_UNSIGNED (TREE_TYPE (arg1
)))
2885 case tcc_comparison
:
2887 if (OP_SAME (0) && OP_SAME (1))
2890 /* For commutative ops, allow the other order. */
2891 return (commutative_tree_code (TREE_CODE (arg0
))
2892 && operand_equal_p (TREE_OPERAND (arg0
, 0),
2893 TREE_OPERAND (arg1
, 1), flags
)
2894 && operand_equal_p (TREE_OPERAND (arg0
, 1),
2895 TREE_OPERAND (arg1
, 0), flags
));
2898 /* If either of the pointer (or reference) expressions we are
2899 dereferencing contain a side effect, these cannot be equal,
2900 but their addresses can be. */
2901 if ((flags
& OEP_CONSTANT_ADDRESS_OF
) == 0
2902 && (TREE_SIDE_EFFECTS (arg0
)
2903 || TREE_SIDE_EFFECTS (arg1
)))
2906 switch (TREE_CODE (arg0
))
2909 if (!(flags
& OEP_ADDRESS_OF
)
2910 && (TYPE_ALIGN (TREE_TYPE (arg0
))
2911 != TYPE_ALIGN (TREE_TYPE (arg1
))))
2913 flags
&= ~(OEP_CONSTANT_ADDRESS_OF
|OEP_ADDRESS_OF
);
2920 case TARGET_MEM_REF
:
2922 /* Require equal access sizes, and similar pointer types.
2923 We can have incomplete types for array references of
2924 variable-sized arrays from the Fortran frontend
2925 though. Also verify the types are compatible. */
2926 if (!((TYPE_SIZE (TREE_TYPE (arg0
)) == TYPE_SIZE (TREE_TYPE (arg1
))
2927 || (TYPE_SIZE (TREE_TYPE (arg0
))
2928 && TYPE_SIZE (TREE_TYPE (arg1
))
2929 && operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
2930 TYPE_SIZE (TREE_TYPE (arg1
)), flags
)))
2931 && types_compatible_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
))
2932 && ((flags
& OEP_ADDRESS_OF
)
2933 || (alias_ptr_types_compatible_p
2934 (TREE_TYPE (TREE_OPERAND (arg0
, 1)),
2935 TREE_TYPE (TREE_OPERAND (arg1
, 1)))
2936 && (MR_DEPENDENCE_CLIQUE (arg0
)
2937 == MR_DEPENDENCE_CLIQUE (arg1
))
2938 && (MR_DEPENDENCE_BASE (arg0
)
2939 == MR_DEPENDENCE_BASE (arg1
))
2940 && (TYPE_ALIGN (TREE_TYPE (arg0
))
2941 == TYPE_ALIGN (TREE_TYPE (arg1
)))))))
2943 flags
&= ~(OEP_CONSTANT_ADDRESS_OF
|OEP_ADDRESS_OF
);
2944 return (OP_SAME (0) && OP_SAME (1)
2945 /* TARGET_MEM_REF require equal extra operands. */
2946 && (TREE_CODE (arg0
) != TARGET_MEM_REF
2947 || (OP_SAME_WITH_NULL (2)
2948 && OP_SAME_WITH_NULL (3)
2949 && OP_SAME_WITH_NULL (4))));
2952 case ARRAY_RANGE_REF
:
2953 /* Operands 2 and 3 may be null.
2954 Compare the array index by value if it is constant first as we
2955 may have different types but same value here. */
2958 flags
&= ~(OEP_CONSTANT_ADDRESS_OF
|OEP_ADDRESS_OF
);
2959 return ((tree_int_cst_equal (TREE_OPERAND (arg0
, 1),
2960 TREE_OPERAND (arg1
, 1))
2962 && OP_SAME_WITH_NULL (2)
2963 && OP_SAME_WITH_NULL (3));
2966 /* Handle operand 2 the same as for ARRAY_REF. Operand 0
2967 may be NULL when we're called to compare MEM_EXPRs. */
2968 if (!OP_SAME_WITH_NULL (0)
2971 flags
&= ~(OEP_CONSTANT_ADDRESS_OF
|OEP_ADDRESS_OF
);
2972 return OP_SAME_WITH_NULL (2);
2977 flags
&= ~(OEP_CONSTANT_ADDRESS_OF
|OEP_ADDRESS_OF
);
2978 return OP_SAME (1) && OP_SAME (2);
2984 case tcc_expression
:
2985 switch (TREE_CODE (arg0
))
2988 return operand_equal_p (TREE_OPERAND (arg0
, 0),
2989 TREE_OPERAND (arg1
, 0),
2990 flags
| OEP_ADDRESS_OF
);
2992 case TRUTH_NOT_EXPR
:
2995 case TRUTH_ANDIF_EXPR
:
2996 case TRUTH_ORIF_EXPR
:
2997 return OP_SAME (0) && OP_SAME (1);
3000 case WIDEN_MULT_PLUS_EXPR
:
3001 case WIDEN_MULT_MINUS_EXPR
:
3004 /* The multiplcation operands are commutative. */
3007 case TRUTH_AND_EXPR
:
3009 case TRUTH_XOR_EXPR
:
3010 if (OP_SAME (0) && OP_SAME (1))
3013 /* Otherwise take into account this is a commutative operation. */
3014 return (operand_equal_p (TREE_OPERAND (arg0
, 0),
3015 TREE_OPERAND (arg1
, 1), flags
)
3016 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3017 TREE_OPERAND (arg1
, 0), flags
));
3022 return OP_SAME (0) && OP_SAME (1) && OP_SAME (2);
3029 switch (TREE_CODE (arg0
))
3032 if ((CALL_EXPR_FN (arg0
) == NULL_TREE
)
3033 != (CALL_EXPR_FN (arg1
) == NULL_TREE
))
3034 /* If not both CALL_EXPRs are either internal or normal function
3035 functions, then they are not equal. */
3037 else if (CALL_EXPR_FN (arg0
) == NULL_TREE
)
3039 /* If the CALL_EXPRs call different internal functions, then they
3041 if (CALL_EXPR_IFN (arg0
) != CALL_EXPR_IFN (arg1
))
3046 /* If the CALL_EXPRs call different functions, then they are not
3048 if (! operand_equal_p (CALL_EXPR_FN (arg0
), CALL_EXPR_FN (arg1
),
3054 unsigned int cef
= call_expr_flags (arg0
);
3055 if (flags
& OEP_PURE_SAME
)
3056 cef
&= ECF_CONST
| ECF_PURE
;
3063 /* Now see if all the arguments are the same. */
3065 const_call_expr_arg_iterator iter0
, iter1
;
3067 for (a0
= first_const_call_expr_arg (arg0
, &iter0
),
3068 a1
= first_const_call_expr_arg (arg1
, &iter1
);
3070 a0
= next_const_call_expr_arg (&iter0
),
3071 a1
= next_const_call_expr_arg (&iter1
))
3072 if (! operand_equal_p (a0
, a1
, flags
))
3075 /* If we get here and both argument lists are exhausted
3076 then the CALL_EXPRs are equal. */
3077 return ! (a0
|| a1
);
3083 case tcc_declaration
:
3084 /* Consider __builtin_sqrt equal to sqrt. */
3085 return (TREE_CODE (arg0
) == FUNCTION_DECL
3086 && DECL_BUILT_IN (arg0
) && DECL_BUILT_IN (arg1
)
3087 && DECL_BUILT_IN_CLASS (arg0
) == DECL_BUILT_IN_CLASS (arg1
)
3088 && DECL_FUNCTION_CODE (arg0
) == DECL_FUNCTION_CODE (arg1
));
3095 #undef OP_SAME_WITH_NULL
3098 /* Similar to operand_equal_p, but see if ARG0 might have been made by
3099 shorten_compare from ARG1 when ARG1 was being compared with OTHER.
3101 When in doubt, return 0. */
3104 operand_equal_for_comparison_p (tree arg0
, tree arg1
, tree other
)
3106 int unsignedp1
, unsignedpo
;
3107 tree primarg0
, primarg1
, primother
;
3108 unsigned int correct_width
;
3110 if (operand_equal_p (arg0
, arg1
, 0))
3113 if (! INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
3114 || ! INTEGRAL_TYPE_P (TREE_TYPE (arg1
)))
3117 /* Discard any conversions that don't change the modes of ARG0 and ARG1
3118 and see if the inner values are the same. This removes any
3119 signedness comparison, which doesn't matter here. */
3120 primarg0
= arg0
, primarg1
= arg1
;
3121 STRIP_NOPS (primarg0
);
3122 STRIP_NOPS (primarg1
);
3123 if (operand_equal_p (primarg0
, primarg1
, 0))
3126 /* Duplicate what shorten_compare does to ARG1 and see if that gives the
3127 actual comparison operand, ARG0.
3129 First throw away any conversions to wider types
3130 already present in the operands. */
3132 primarg1
= get_narrower (arg1
, &unsignedp1
);
3133 primother
= get_narrower (other
, &unsignedpo
);
3135 correct_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
3136 if (unsignedp1
== unsignedpo
3137 && TYPE_PRECISION (TREE_TYPE (primarg1
)) < correct_width
3138 && TYPE_PRECISION (TREE_TYPE (primother
)) < correct_width
)
3140 tree type
= TREE_TYPE (arg0
);
3142 /* Make sure shorter operand is extended the right way
3143 to match the longer operand. */
3144 primarg1
= fold_convert (signed_or_unsigned_type_for
3145 (unsignedp1
, TREE_TYPE (primarg1
)), primarg1
);
3147 if (operand_equal_p (arg0
, fold_convert (type
, primarg1
), 0))
3154 /* See if ARG is an expression that is either a comparison or is performing
3155 arithmetic on comparisons. The comparisons must only be comparing
3156 two different values, which will be stored in *CVAL1 and *CVAL2; if
3157 they are nonzero it means that some operands have already been found.
3158 No variables may be used anywhere else in the expression except in the
3159 comparisons. If SAVE_P is true it means we removed a SAVE_EXPR around
3160 the expression and save_expr needs to be called with CVAL1 and CVAL2.
3162 If this is true, return 1. Otherwise, return zero. */
3165 twoval_comparison_p (tree arg
, tree
*cval1
, tree
*cval2
, int *save_p
)
3167 enum tree_code code
= TREE_CODE (arg
);
3168 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3170 /* We can handle some of the tcc_expression cases here. */
3171 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3173 else if (tclass
== tcc_expression
3174 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
3175 || code
== COMPOUND_EXPR
))
3176 tclass
= tcc_binary
;
3178 else if (tclass
== tcc_expression
&& code
== SAVE_EXPR
3179 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg
, 0)))
3181 /* If we've already found a CVAL1 or CVAL2, this expression is
3182 two complex to handle. */
3183 if (*cval1
|| *cval2
)
3193 return twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
, save_p
);
3196 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
, save_p
)
3197 && twoval_comparison_p (TREE_OPERAND (arg
, 1),
3198 cval1
, cval2
, save_p
));
3203 case tcc_expression
:
3204 if (code
== COND_EXPR
)
3205 return (twoval_comparison_p (TREE_OPERAND (arg
, 0),
3206 cval1
, cval2
, save_p
)
3207 && twoval_comparison_p (TREE_OPERAND (arg
, 1),
3208 cval1
, cval2
, save_p
)
3209 && twoval_comparison_p (TREE_OPERAND (arg
, 2),
3210 cval1
, cval2
, save_p
));
3213 case tcc_comparison
:
3214 /* First see if we can handle the first operand, then the second. For
3215 the second operand, we know *CVAL1 can't be zero. It must be that
3216 one side of the comparison is each of the values; test for the
3217 case where this isn't true by failing if the two operands
3220 if (operand_equal_p (TREE_OPERAND (arg
, 0),
3221 TREE_OPERAND (arg
, 1), 0))
3225 *cval1
= TREE_OPERAND (arg
, 0);
3226 else if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 0), 0))
3228 else if (*cval2
== 0)
3229 *cval2
= TREE_OPERAND (arg
, 0);
3230 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 0), 0))
3235 if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 1), 0))
3237 else if (*cval2
== 0)
3238 *cval2
= TREE_OPERAND (arg
, 1);
3239 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 1), 0))
3251 /* ARG is a tree that is known to contain just arithmetic operations and
3252 comparisons. Evaluate the operations in the tree substituting NEW0 for
3253 any occurrence of OLD0 as an operand of a comparison and likewise for
3257 eval_subst (location_t loc
, tree arg
, tree old0
, tree new0
,
3258 tree old1
, tree new1
)
3260 tree type
= TREE_TYPE (arg
);
3261 enum tree_code code
= TREE_CODE (arg
);
3262 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3264 /* We can handle some of the tcc_expression cases here. */
3265 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3267 else if (tclass
== tcc_expression
3268 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
3269 tclass
= tcc_binary
;
3274 return fold_build1_loc (loc
, code
, type
,
3275 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3276 old0
, new0
, old1
, new1
));
3279 return fold_build2_loc (loc
, code
, type
,
3280 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3281 old0
, new0
, old1
, new1
),
3282 eval_subst (loc
, TREE_OPERAND (arg
, 1),
3283 old0
, new0
, old1
, new1
));
3285 case tcc_expression
:
3289 return eval_subst (loc
, TREE_OPERAND (arg
, 0), old0
, new0
,
3293 return eval_subst (loc
, TREE_OPERAND (arg
, 1), old0
, new0
,
3297 return fold_build3_loc (loc
, code
, type
,
3298 eval_subst (loc
, TREE_OPERAND (arg
, 0),
3299 old0
, new0
, old1
, new1
),
3300 eval_subst (loc
, TREE_OPERAND (arg
, 1),
3301 old0
, new0
, old1
, new1
),
3302 eval_subst (loc
, TREE_OPERAND (arg
, 2),
3303 old0
, new0
, old1
, new1
));
3307 /* Fall through - ??? */
3309 case tcc_comparison
:
3311 tree arg0
= TREE_OPERAND (arg
, 0);
3312 tree arg1
= TREE_OPERAND (arg
, 1);
3314 /* We need to check both for exact equality and tree equality. The
3315 former will be true if the operand has a side-effect. In that
3316 case, we know the operand occurred exactly once. */
3318 if (arg0
== old0
|| operand_equal_p (arg0
, old0
, 0))
3320 else if (arg0
== old1
|| operand_equal_p (arg0
, old1
, 0))
3323 if (arg1
== old0
|| operand_equal_p (arg1
, old0
, 0))
3325 else if (arg1
== old1
|| operand_equal_p (arg1
, old1
, 0))
3328 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
3336 /* Return a tree for the case when the result of an expression is RESULT
3337 converted to TYPE and OMITTED was previously an operand of the expression
3338 but is now not needed (e.g., we folded OMITTED * 0).
3340 If OMITTED has side effects, we must evaluate it. Otherwise, just do
3341 the conversion of RESULT to TYPE. */
3344 omit_one_operand_loc (location_t loc
, tree type
, tree result
, tree omitted
)
3346 tree t
= fold_convert_loc (loc
, type
, result
);
3348 /* If the resulting operand is an empty statement, just return the omitted
3349 statement casted to void. */
3350 if (IS_EMPTY_STMT (t
) && TREE_SIDE_EFFECTS (omitted
))
3351 return build1_loc (loc
, NOP_EXPR
, void_type_node
,
3352 fold_ignored_result (omitted
));
3354 if (TREE_SIDE_EFFECTS (omitted
))
3355 return build2_loc (loc
, COMPOUND_EXPR
, type
,
3356 fold_ignored_result (omitted
), t
);
3358 return non_lvalue_loc (loc
, t
);
3361 /* Return a tree for the case when the result of an expression is RESULT
3362 converted to TYPE and OMITTED1 and OMITTED2 were previously operands
3363 of the expression but are now not needed.
3365 If OMITTED1 or OMITTED2 has side effects, they must be evaluated.
3366 If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is
3367 evaluated before OMITTED2. Otherwise, if neither has side effects,
3368 just do the conversion of RESULT to TYPE. */
3371 omit_two_operands_loc (location_t loc
, tree type
, tree result
,
3372 tree omitted1
, tree omitted2
)
3374 tree t
= fold_convert_loc (loc
, type
, result
);
3376 if (TREE_SIDE_EFFECTS (omitted2
))
3377 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted2
, t
);
3378 if (TREE_SIDE_EFFECTS (omitted1
))
3379 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted1
, t
);
3381 return TREE_CODE (t
) != COMPOUND_EXPR
? non_lvalue_loc (loc
, t
) : t
;
3385 /* Return a simplified tree node for the truth-negation of ARG. This
3386 never alters ARG itself. We assume that ARG is an operation that
3387 returns a truth value (0 or 1).
3389 FIXME: one would think we would fold the result, but it causes
3390 problems with the dominator optimizer. */
3393 fold_truth_not_expr (location_t loc
, tree arg
)
3395 tree type
= TREE_TYPE (arg
);
3396 enum tree_code code
= TREE_CODE (arg
);
3397 location_t loc1
, loc2
;
3399 /* If this is a comparison, we can simply invert it, except for
3400 floating-point non-equality comparisons, in which case we just
3401 enclose a TRUTH_NOT_EXPR around what we have. */
3403 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
3405 tree op_type
= TREE_TYPE (TREE_OPERAND (arg
, 0));
3406 if (FLOAT_TYPE_P (op_type
)
3407 && flag_trapping_math
3408 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
3409 && code
!= NE_EXPR
&& code
!= EQ_EXPR
)
3412 code
= invert_tree_comparison (code
, HONOR_NANS (op_type
));
3413 if (code
== ERROR_MARK
)
3416 return build2_loc (loc
, code
, type
, TREE_OPERAND (arg
, 0),
3417 TREE_OPERAND (arg
, 1));
3423 return constant_boolean_node (integer_zerop (arg
), type
);
3425 case TRUTH_AND_EXPR
:
3426 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3427 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3428 return build2_loc (loc
, TRUTH_OR_EXPR
, type
,
3429 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3430 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3433 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3434 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3435 return build2_loc (loc
, TRUTH_AND_EXPR
, type
,
3436 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3437 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3439 case TRUTH_XOR_EXPR
:
3440 /* Here we can invert either operand. We invert the first operand
3441 unless the second operand is a TRUTH_NOT_EXPR in which case our
3442 result is the XOR of the first operand with the inside of the
3443 negation of the second operand. */
3445 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == TRUTH_NOT_EXPR
)
3446 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
, TREE_OPERAND (arg
, 0),
3447 TREE_OPERAND (TREE_OPERAND (arg
, 1), 0));
3449 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
,
3450 invert_truthvalue_loc (loc
, TREE_OPERAND (arg
, 0)),
3451 TREE_OPERAND (arg
, 1));
3453 case TRUTH_ANDIF_EXPR
:
3454 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3455 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3456 return build2_loc (loc
, TRUTH_ORIF_EXPR
, type
,
3457 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3458 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3460 case TRUTH_ORIF_EXPR
:
3461 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3462 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3463 return build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
3464 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
3465 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
3467 case TRUTH_NOT_EXPR
:
3468 return TREE_OPERAND (arg
, 0);
3472 tree arg1
= TREE_OPERAND (arg
, 1);
3473 tree arg2
= TREE_OPERAND (arg
, 2);
3475 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3476 loc2
= expr_location_or (TREE_OPERAND (arg
, 2), loc
);
3478 /* A COND_EXPR may have a throw as one operand, which
3479 then has void type. Just leave void operands
3481 return build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg
, 0),
3482 VOID_TYPE_P (TREE_TYPE (arg1
))
3483 ? arg1
: invert_truthvalue_loc (loc1
, arg1
),
3484 VOID_TYPE_P (TREE_TYPE (arg2
))
3485 ? arg2
: invert_truthvalue_loc (loc2
, arg2
));
3489 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
3490 return build2_loc (loc
, COMPOUND_EXPR
, type
,
3491 TREE_OPERAND (arg
, 0),
3492 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 1)));
3494 case NON_LVALUE_EXPR
:
3495 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3496 return invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0));
3499 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
)
3500 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
3502 /* ... fall through ... */
3505 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3506 return build1_loc (loc
, TREE_CODE (arg
), type
,
3507 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
3510 if (!integer_onep (TREE_OPERAND (arg
, 1)))
3512 return build2_loc (loc
, EQ_EXPR
, type
, arg
, build_int_cst (type
, 0));
3515 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
3517 case CLEANUP_POINT_EXPR
:
3518 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
3519 return build1_loc (loc
, CLEANUP_POINT_EXPR
, type
,
3520 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
3527 /* Fold the truth-negation of ARG. This never alters ARG itself. We
3528 assume that ARG is an operation that returns a truth value (0 or 1
3529 for scalars, 0 or -1 for vectors). Return the folded expression if
3530 folding is successful. Otherwise, return NULL_TREE. */
3533 fold_invert_truthvalue (location_t loc
, tree arg
)
3535 tree type
= TREE_TYPE (arg
);
3536 return fold_unary_loc (loc
, VECTOR_TYPE_P (type
)
3542 /* Return a simplified tree node for the truth-negation of ARG. This
3543 never alters ARG itself. We assume that ARG is an operation that
3544 returns a truth value (0 or 1 for scalars, 0 or -1 for vectors). */
3547 invert_truthvalue_loc (location_t loc
, tree arg
)
3549 if (TREE_CODE (arg
) == ERROR_MARK
)
3552 tree type
= TREE_TYPE (arg
);
3553 return fold_build1_loc (loc
, VECTOR_TYPE_P (type
)
3559 /* Given a bit-wise operation CODE applied to ARG0 and ARG1, see if both
3560 operands are another bit-wise operation with a common input. If so,
3561 distribute the bit operations to save an operation and possibly two if
3562 constants are involved. For example, convert
3563 (A | B) & (A | C) into A | (B & C)
3564 Further simplification will occur if B and C are constants.
3566 If this optimization cannot be done, 0 will be returned. */
3569 distribute_bit_expr (location_t loc
, enum tree_code code
, tree type
,
3570 tree arg0
, tree arg1
)
3575 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
3576 || TREE_CODE (arg0
) == code
3577 || (TREE_CODE (arg0
) != BIT_AND_EXPR
3578 && TREE_CODE (arg0
) != BIT_IOR_EXPR
))
3581 if (operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 0), 0))
3583 common
= TREE_OPERAND (arg0
, 0);
3584 left
= TREE_OPERAND (arg0
, 1);
3585 right
= TREE_OPERAND (arg1
, 1);
3587 else if (operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 1), 0))
3589 common
= TREE_OPERAND (arg0
, 0);
3590 left
= TREE_OPERAND (arg0
, 1);
3591 right
= TREE_OPERAND (arg1
, 0);
3593 else if (operand_equal_p (TREE_OPERAND (arg0
, 1), TREE_OPERAND (arg1
, 0), 0))
3595 common
= TREE_OPERAND (arg0
, 1);
3596 left
= TREE_OPERAND (arg0
, 0);
3597 right
= TREE_OPERAND (arg1
, 1);
3599 else if (operand_equal_p (TREE_OPERAND (arg0
, 1), TREE_OPERAND (arg1
, 1), 0))
3601 common
= TREE_OPERAND (arg0
, 1);
3602 left
= TREE_OPERAND (arg0
, 0);
3603 right
= TREE_OPERAND (arg1
, 0);
3608 common
= fold_convert_loc (loc
, type
, common
);
3609 left
= fold_convert_loc (loc
, type
, left
);
3610 right
= fold_convert_loc (loc
, type
, right
);
3611 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, common
,
3612 fold_build2_loc (loc
, code
, type
, left
, right
));
3615 /* Knowing that ARG0 and ARG1 are both RDIV_EXPRs, simplify a binary operation
3616 with code CODE. This optimization is unsafe. */
3618 distribute_real_division (location_t loc
, enum tree_code code
, tree type
,
3619 tree arg0
, tree arg1
)
3621 bool mul0
= TREE_CODE (arg0
) == MULT_EXPR
;
3622 bool mul1
= TREE_CODE (arg1
) == MULT_EXPR
;
3624 /* (A / C) +- (B / C) -> (A +- B) / C. */
3626 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3627 TREE_OPERAND (arg1
, 1), 0))
3628 return fold_build2_loc (loc
, mul0
? MULT_EXPR
: RDIV_EXPR
, type
,
3629 fold_build2_loc (loc
, code
, type
,
3630 TREE_OPERAND (arg0
, 0),
3631 TREE_OPERAND (arg1
, 0)),
3632 TREE_OPERAND (arg0
, 1));
3634 /* (A / C1) +- (A / C2) -> A * (1 / C1 +- 1 / C2). */
3635 if (operand_equal_p (TREE_OPERAND (arg0
, 0),
3636 TREE_OPERAND (arg1
, 0), 0)
3637 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
3638 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == REAL_CST
)
3640 REAL_VALUE_TYPE r0
, r1
;
3641 r0
= TREE_REAL_CST (TREE_OPERAND (arg0
, 1));
3642 r1
= TREE_REAL_CST (TREE_OPERAND (arg1
, 1));
3644 real_arithmetic (&r0
, RDIV_EXPR
, &dconst1
, &r0
);
3646 real_arithmetic (&r1
, RDIV_EXPR
, &dconst1
, &r1
);
3647 real_arithmetic (&r0
, code
, &r0
, &r1
);
3648 return fold_build2_loc (loc
, MULT_EXPR
, type
,
3649 TREE_OPERAND (arg0
, 0),
3650 build_real (type
, r0
));
3656 /* Return a BIT_FIELD_REF of type TYPE to refer to BITSIZE bits of INNER
3657 starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero. */
3660 make_bit_field_ref (location_t loc
, tree inner
, tree type
,
3661 HOST_WIDE_INT bitsize
, HOST_WIDE_INT bitpos
, int unsignedp
)
3663 tree result
, bftype
;
3667 tree size
= TYPE_SIZE (TREE_TYPE (inner
));
3668 if ((INTEGRAL_TYPE_P (TREE_TYPE (inner
))
3669 || POINTER_TYPE_P (TREE_TYPE (inner
)))
3670 && tree_fits_shwi_p (size
)
3671 && tree_to_shwi (size
) == bitsize
)
3672 return fold_convert_loc (loc
, type
, inner
);
3676 if (TYPE_PRECISION (bftype
) != bitsize
3677 || TYPE_UNSIGNED (bftype
) == !unsignedp
)
3678 bftype
= build_nonstandard_integer_type (bitsize
, 0);
3680 result
= build3_loc (loc
, BIT_FIELD_REF
, bftype
, inner
,
3681 size_int (bitsize
), bitsize_int (bitpos
));
3684 result
= fold_convert_loc (loc
, type
, result
);
3689 /* Optimize a bit-field compare.
3691 There are two cases: First is a compare against a constant and the
3692 second is a comparison of two items where the fields are at the same
3693 bit position relative to the start of a chunk (byte, halfword, word)
3694 large enough to contain it. In these cases we can avoid the shift
3695 implicit in bitfield extractions.
3697 For constants, we emit a compare of the shifted constant with the
3698 BIT_AND_EXPR of a mask and a byte, halfword, or word of the operand being
3699 compared. For two fields at the same position, we do the ANDs with the
3700 similar mask and compare the result of the ANDs.
3702 CODE is the comparison code, known to be either NE_EXPR or EQ_EXPR.
3703 COMPARE_TYPE is the type of the comparison, and LHS and RHS
3704 are the left and right operands of the comparison, respectively.
3706 If the optimization described above can be done, we return the resulting
3707 tree. Otherwise we return zero. */
3710 optimize_bit_field_compare (location_t loc
, enum tree_code code
,
3711 tree compare_type
, tree lhs
, tree rhs
)
3713 HOST_WIDE_INT lbitpos
, lbitsize
, rbitpos
, rbitsize
, nbitpos
, nbitsize
;
3714 tree type
= TREE_TYPE (lhs
);
3716 int const_p
= TREE_CODE (rhs
) == INTEGER_CST
;
3717 machine_mode lmode
, rmode
, nmode
;
3718 int lunsignedp
, runsignedp
;
3719 int lvolatilep
= 0, rvolatilep
= 0;
3720 tree linner
, rinner
= NULL_TREE
;
3724 /* Get all the information about the extractions being done. If the bit size
3725 if the same as the size of the underlying object, we aren't doing an
3726 extraction at all and so can do nothing. We also don't want to
3727 do anything if the inner expression is a PLACEHOLDER_EXPR since we
3728 then will no longer be able to replace it. */
3729 linner
= get_inner_reference (lhs
, &lbitsize
, &lbitpos
, &offset
, &lmode
,
3730 &lunsignedp
, &lvolatilep
, false);
3731 if (linner
== lhs
|| lbitsize
== GET_MODE_BITSIZE (lmode
) || lbitsize
< 0
3732 || offset
!= 0 || TREE_CODE (linner
) == PLACEHOLDER_EXPR
|| lvolatilep
)
3737 /* If this is not a constant, we can only do something if bit positions,
3738 sizes, and signedness are the same. */
3739 rinner
= get_inner_reference (rhs
, &rbitsize
, &rbitpos
, &offset
, &rmode
,
3740 &runsignedp
, &rvolatilep
, false);
3742 if (rinner
== rhs
|| lbitpos
!= rbitpos
|| lbitsize
!= rbitsize
3743 || lunsignedp
!= runsignedp
|| offset
!= 0
3744 || TREE_CODE (rinner
) == PLACEHOLDER_EXPR
|| rvolatilep
)
3748 /* See if we can find a mode to refer to this field. We should be able to,
3749 but fail if we can't. */
3750 nmode
= get_best_mode (lbitsize
, lbitpos
, 0, 0,
3751 const_p
? TYPE_ALIGN (TREE_TYPE (linner
))
3752 : MIN (TYPE_ALIGN (TREE_TYPE (linner
)),
3753 TYPE_ALIGN (TREE_TYPE (rinner
))),
3755 if (nmode
== VOIDmode
)
3758 /* Set signed and unsigned types of the precision of this mode for the
3760 unsigned_type
= lang_hooks
.types
.type_for_mode (nmode
, 1);
3762 /* Compute the bit position and size for the new reference and our offset
3763 within it. If the new reference is the same size as the original, we
3764 won't optimize anything, so return zero. */
3765 nbitsize
= GET_MODE_BITSIZE (nmode
);
3766 nbitpos
= lbitpos
& ~ (nbitsize
- 1);
3768 if (nbitsize
== lbitsize
)
3771 if (BYTES_BIG_ENDIAN
)
3772 lbitpos
= nbitsize
- lbitsize
- lbitpos
;
3774 /* Make the mask to be used against the extracted field. */
3775 mask
= build_int_cst_type (unsigned_type
, -1);
3776 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (nbitsize
- lbitsize
));
3777 mask
= const_binop (RSHIFT_EXPR
, mask
,
3778 size_int (nbitsize
- lbitsize
- lbitpos
));
3781 /* If not comparing with constant, just rework the comparison
3783 return fold_build2_loc (loc
, code
, compare_type
,
3784 fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
3785 make_bit_field_ref (loc
, linner
,
3790 fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
3791 make_bit_field_ref (loc
, rinner
,
3797 /* Otherwise, we are handling the constant case. See if the constant is too
3798 big for the field. Warn and return a tree of for 0 (false) if so. We do
3799 this not only for its own sake, but to avoid having to test for this
3800 error case below. If we didn't, we might generate wrong code.
3802 For unsigned fields, the constant shifted right by the field length should
3803 be all zero. For signed fields, the high-order bits should agree with
3808 if (wi::lrshift (rhs
, lbitsize
) != 0)
3810 warning (0, "comparison is always %d due to width of bit-field",
3812 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
3817 wide_int tem
= wi::arshift (rhs
, lbitsize
- 1);
3818 if (tem
!= 0 && tem
!= -1)
3820 warning (0, "comparison is always %d due to width of bit-field",
3822 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
3826 /* Single-bit compares should always be against zero. */
3827 if (lbitsize
== 1 && ! integer_zerop (rhs
))
3829 code
= code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
;
3830 rhs
= build_int_cst (type
, 0);
3833 /* Make a new bitfield reference, shift the constant over the
3834 appropriate number of bits and mask it with the computed mask
3835 (in case this was a signed field). If we changed it, make a new one. */
3836 lhs
= make_bit_field_ref (loc
, linner
, unsigned_type
, nbitsize
, nbitpos
, 1);
3838 rhs
= const_binop (BIT_AND_EXPR
,
3839 const_binop (LSHIFT_EXPR
,
3840 fold_convert_loc (loc
, unsigned_type
, rhs
),
3841 size_int (lbitpos
)),
3844 lhs
= build2_loc (loc
, code
, compare_type
,
3845 build2 (BIT_AND_EXPR
, unsigned_type
, lhs
, mask
), rhs
);
3849 /* Subroutine for fold_truth_andor_1: decode a field reference.
3851 If EXP is a comparison reference, we return the innermost reference.
3853 *PBITSIZE is set to the number of bits in the reference, *PBITPOS is
3854 set to the starting bit number.
3856 If the innermost field can be completely contained in a mode-sized
3857 unit, *PMODE is set to that mode. Otherwise, it is set to VOIDmode.
3859 *PVOLATILEP is set to 1 if the any expression encountered is volatile;
3860 otherwise it is not changed.
3862 *PUNSIGNEDP is set to the signedness of the field.
3864 *PMASK is set to the mask used. This is either contained in a
3865 BIT_AND_EXPR or derived from the width of the field.
3867 *PAND_MASK is set to the mask found in a BIT_AND_EXPR, if any.
3869 Return 0 if this is not a component reference or is one that we can't
3870 do anything with. */
3873 decode_field_reference (location_t loc
, tree exp
, HOST_WIDE_INT
*pbitsize
,
3874 HOST_WIDE_INT
*pbitpos
, machine_mode
*pmode
,
3875 int *punsignedp
, int *pvolatilep
,
3876 tree
*pmask
, tree
*pand_mask
)
3878 tree outer_type
= 0;
3880 tree mask
, inner
, offset
;
3882 unsigned int precision
;
3884 /* All the optimizations using this function assume integer fields.
3885 There are problems with FP fields since the type_for_size call
3886 below can fail for, e.g., XFmode. */
3887 if (! INTEGRAL_TYPE_P (TREE_TYPE (exp
)))
3890 /* We are interested in the bare arrangement of bits, so strip everything
3891 that doesn't affect the machine mode. However, record the type of the
3892 outermost expression if it may matter below. */
3893 if (CONVERT_EXPR_P (exp
)
3894 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
3895 outer_type
= TREE_TYPE (exp
);
3898 if (TREE_CODE (exp
) == BIT_AND_EXPR
)
3900 and_mask
= TREE_OPERAND (exp
, 1);
3901 exp
= TREE_OPERAND (exp
, 0);
3902 STRIP_NOPS (exp
); STRIP_NOPS (and_mask
);
3903 if (TREE_CODE (and_mask
) != INTEGER_CST
)
3907 inner
= get_inner_reference (exp
, pbitsize
, pbitpos
, &offset
, pmode
,
3908 punsignedp
, pvolatilep
, false);
3909 if ((inner
== exp
&& and_mask
== 0)
3910 || *pbitsize
< 0 || offset
!= 0
3911 || TREE_CODE (inner
) == PLACEHOLDER_EXPR
)
3914 /* If the number of bits in the reference is the same as the bitsize of
3915 the outer type, then the outer type gives the signedness. Otherwise
3916 (in case of a small bitfield) the signedness is unchanged. */
3917 if (outer_type
&& *pbitsize
== TYPE_PRECISION (outer_type
))
3918 *punsignedp
= TYPE_UNSIGNED (outer_type
);
3920 /* Compute the mask to access the bitfield. */
3921 unsigned_type
= lang_hooks
.types
.type_for_size (*pbitsize
, 1);
3922 precision
= TYPE_PRECISION (unsigned_type
);
3924 mask
= build_int_cst_type (unsigned_type
, -1);
3926 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
3927 mask
= const_binop (RSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
3929 /* Merge it with the mask we found in the BIT_AND_EXPR, if any. */
3931 mask
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
3932 fold_convert_loc (loc
, unsigned_type
, and_mask
), mask
);
3935 *pand_mask
= and_mask
;
3939 /* Return nonzero if MASK represents a mask of SIZE ones in the low-order
3940 bit positions and MASK is SIGNED. */
3943 all_ones_mask_p (const_tree mask
, unsigned int size
)
3945 tree type
= TREE_TYPE (mask
);
3946 unsigned int precision
= TYPE_PRECISION (type
);
3948 /* If this function returns true when the type of the mask is
3949 UNSIGNED, then there will be errors. In particular see
3950 gcc.c-torture/execute/990326-1.c. There does not appear to be
3951 any documentation paper trail as to why this is so. But the pre
3952 wide-int worked with that restriction and it has been preserved
3954 if (size
> precision
|| TYPE_SIGN (type
) == UNSIGNED
)
3957 return wi::mask (size
, false, precision
) == mask
;
3960 /* Subroutine for fold: determine if VAL is the INTEGER_CONST that
3961 represents the sign bit of EXP's type. If EXP represents a sign
3962 or zero extension, also test VAL against the unextended type.
3963 The return value is the (sub)expression whose sign bit is VAL,
3964 or NULL_TREE otherwise. */
3967 sign_bit_p (tree exp
, const_tree val
)
3972 /* Tree EXP must have an integral type. */
3973 t
= TREE_TYPE (exp
);
3974 if (! INTEGRAL_TYPE_P (t
))
3977 /* Tree VAL must be an integer constant. */
3978 if (TREE_CODE (val
) != INTEGER_CST
3979 || TREE_OVERFLOW (val
))
3982 width
= TYPE_PRECISION (t
);
3983 if (wi::only_sign_bit_p (val
, width
))
3986 /* Handle extension from a narrower type. */
3987 if (TREE_CODE (exp
) == NOP_EXPR
3988 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp
, 0))) < width
)
3989 return sign_bit_p (TREE_OPERAND (exp
, 0), val
);
3994 /* Subroutine for fold_truth_andor_1: determine if an operand is simple enough
3995 to be evaluated unconditionally. */
3998 simple_operand_p (const_tree exp
)
4000 /* Strip any conversions that don't change the machine mode. */
4003 return (CONSTANT_CLASS_P (exp
)
4004 || TREE_CODE (exp
) == SSA_NAME
4006 && ! TREE_ADDRESSABLE (exp
)
4007 && ! TREE_THIS_VOLATILE (exp
)
4008 && ! DECL_NONLOCAL (exp
)
4009 /* Don't regard global variables as simple. They may be
4010 allocated in ways unknown to the compiler (shared memory,
4011 #pragma weak, etc). */
4012 && ! TREE_PUBLIC (exp
)
4013 && ! DECL_EXTERNAL (exp
)
4014 /* Weakrefs are not safe to be read, since they can be NULL.
4015 They are !TREE_PUBLIC && !DECL_EXTERNAL but still
4016 have DECL_WEAK flag set. */
4017 && (! VAR_OR_FUNCTION_DECL_P (exp
) || ! DECL_WEAK (exp
))
4018 /* Loading a static variable is unduly expensive, but global
4019 registers aren't expensive. */
4020 && (! TREE_STATIC (exp
) || DECL_REGISTER (exp
))));
4023 /* Subroutine for fold_truth_andor: determine if an operand is simple enough
4024 to be evaluated unconditionally.
4025 I addition to simple_operand_p, we assume that comparisons, conversions,
4026 and logic-not operations are simple, if their operands are simple, too. */
4029 simple_operand_p_2 (tree exp
)
4031 enum tree_code code
;
4033 if (TREE_SIDE_EFFECTS (exp
)
4034 || tree_could_trap_p (exp
))
4037 while (CONVERT_EXPR_P (exp
))
4038 exp
= TREE_OPERAND (exp
, 0);
4040 code
= TREE_CODE (exp
);
4042 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4043 return (simple_operand_p (TREE_OPERAND (exp
, 0))
4044 && simple_operand_p (TREE_OPERAND (exp
, 1)));
4046 if (code
== TRUTH_NOT_EXPR
)
4047 return simple_operand_p_2 (TREE_OPERAND (exp
, 0));
4049 return simple_operand_p (exp
);
4053 /* The following functions are subroutines to fold_range_test and allow it to
4054 try to change a logical combination of comparisons into a range test.
4057 X == 2 || X == 3 || X == 4 || X == 5
4061 (unsigned) (X - 2) <= 3
4063 We describe each set of comparisons as being either inside or outside
4064 a range, using a variable named like IN_P, and then describe the
4065 range with a lower and upper bound. If one of the bounds is omitted,
4066 it represents either the highest or lowest value of the type.
4068 In the comments below, we represent a range by two numbers in brackets
4069 preceded by a "+" to designate being inside that range, or a "-" to
4070 designate being outside that range, so the condition can be inverted by
4071 flipping the prefix. An omitted bound is represented by a "-". For
4072 example, "- [-, 10]" means being outside the range starting at the lowest
4073 possible value and ending at 10, in other words, being greater than 10.
4074 The range "+ [-, -]" is always true and hence the range "- [-, -]" is
4077 We set up things so that the missing bounds are handled in a consistent
4078 manner so neither a missing bound nor "true" and "false" need to be
4079 handled using a special case. */
4081 /* Return the result of applying CODE to ARG0 and ARG1, but handle the case
4082 of ARG0 and/or ARG1 being omitted, meaning an unlimited range. UPPER0_P
4083 and UPPER1_P are nonzero if the respective argument is an upper bound
4084 and zero for a lower. TYPE, if nonzero, is the type of the result; it
4085 must be specified for a comparison. ARG1 will be converted to ARG0's
4086 type if both are specified. */
4089 range_binop (enum tree_code code
, tree type
, tree arg0
, int upper0_p
,
4090 tree arg1
, int upper1_p
)
4096 /* If neither arg represents infinity, do the normal operation.
4097 Else, if not a comparison, return infinity. Else handle the special
4098 comparison rules. Note that most of the cases below won't occur, but
4099 are handled for consistency. */
4101 if (arg0
!= 0 && arg1
!= 0)
4103 tem
= fold_build2 (code
, type
!= 0 ? type
: TREE_TYPE (arg0
),
4104 arg0
, fold_convert (TREE_TYPE (arg0
), arg1
));
4106 return TREE_CODE (tem
) == INTEGER_CST
? tem
: 0;
4109 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
4112 /* Set SGN[01] to -1 if ARG[01] is a lower bound, 1 for upper, and 0
4113 for neither. In real maths, we cannot assume open ended ranges are
4114 the same. But, this is computer arithmetic, where numbers are finite.
4115 We can therefore make the transformation of any unbounded range with
4116 the value Z, Z being greater than any representable number. This permits
4117 us to treat unbounded ranges as equal. */
4118 sgn0
= arg0
!= 0 ? 0 : (upper0_p
? 1 : -1);
4119 sgn1
= arg1
!= 0 ? 0 : (upper1_p
? 1 : -1);
4123 result
= sgn0
== sgn1
;
4126 result
= sgn0
!= sgn1
;
4129 result
= sgn0
< sgn1
;
4132 result
= sgn0
<= sgn1
;
4135 result
= sgn0
> sgn1
;
4138 result
= sgn0
>= sgn1
;
4144 return constant_boolean_node (result
, type
);
4147 /* Helper routine for make_range. Perform one step for it, return
4148 new expression if the loop should continue or NULL_TREE if it should
4152 make_range_step (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
,
4153 tree exp_type
, tree
*p_low
, tree
*p_high
, int *p_in_p
,
4154 bool *strict_overflow_p
)
4156 tree arg0_type
= TREE_TYPE (arg0
);
4157 tree n_low
, n_high
, low
= *p_low
, high
= *p_high
;
4158 int in_p
= *p_in_p
, n_in_p
;
4162 case TRUTH_NOT_EXPR
:
4163 /* We can only do something if the range is testing for zero. */
4164 if (low
== NULL_TREE
|| high
== NULL_TREE
4165 || ! integer_zerop (low
) || ! integer_zerop (high
))
4170 case EQ_EXPR
: case NE_EXPR
:
4171 case LT_EXPR
: case LE_EXPR
: case GE_EXPR
: case GT_EXPR
:
4172 /* We can only do something if the range is testing for zero
4173 and if the second operand is an integer constant. Note that
4174 saying something is "in" the range we make is done by
4175 complementing IN_P since it will set in the initial case of
4176 being not equal to zero; "out" is leaving it alone. */
4177 if (low
== NULL_TREE
|| high
== NULL_TREE
4178 || ! integer_zerop (low
) || ! integer_zerop (high
)
4179 || TREE_CODE (arg1
) != INTEGER_CST
)
4184 case NE_EXPR
: /* - [c, c] */
4187 case EQ_EXPR
: /* + [c, c] */
4188 in_p
= ! in_p
, low
= high
= arg1
;
4190 case GT_EXPR
: /* - [-, c] */
4191 low
= 0, high
= arg1
;
4193 case GE_EXPR
: /* + [c, -] */
4194 in_p
= ! in_p
, low
= arg1
, high
= 0;
4196 case LT_EXPR
: /* - [c, -] */
4197 low
= arg1
, high
= 0;
4199 case LE_EXPR
: /* + [-, c] */
4200 in_p
= ! in_p
, low
= 0, high
= arg1
;
4206 /* If this is an unsigned comparison, we also know that EXP is
4207 greater than or equal to zero. We base the range tests we make
4208 on that fact, so we record it here so we can parse existing
4209 range tests. We test arg0_type since often the return type
4210 of, e.g. EQ_EXPR, is boolean. */
4211 if (TYPE_UNSIGNED (arg0_type
) && (low
== 0 || high
== 0))
4213 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
,
4215 build_int_cst (arg0_type
, 0),
4219 in_p
= n_in_p
, low
= n_low
, high
= n_high
;
4221 /* If the high bound is missing, but we have a nonzero low
4222 bound, reverse the range so it goes from zero to the low bound
4224 if (high
== 0 && low
&& ! integer_zerop (low
))
4227 high
= range_binop (MINUS_EXPR
, NULL_TREE
, low
, 0,
4228 build_int_cst (TREE_TYPE (low
), 1), 0);
4229 low
= build_int_cst (arg0_type
, 0);
4239 /* If flag_wrapv and ARG0_TYPE is signed, make sure
4240 low and high are non-NULL, then normalize will DTRT. */
4241 if (!TYPE_UNSIGNED (arg0_type
)
4242 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4244 if (low
== NULL_TREE
)
4245 low
= TYPE_MIN_VALUE (arg0_type
);
4246 if (high
== NULL_TREE
)
4247 high
= TYPE_MAX_VALUE (arg0_type
);
4250 /* (-x) IN [a,b] -> x in [-b, -a] */
4251 n_low
= range_binop (MINUS_EXPR
, exp_type
,
4252 build_int_cst (exp_type
, 0),
4254 n_high
= range_binop (MINUS_EXPR
, exp_type
,
4255 build_int_cst (exp_type
, 0),
4257 if (n_high
!= 0 && TREE_OVERFLOW (n_high
))
4263 return build2_loc (loc
, MINUS_EXPR
, exp_type
, negate_expr (arg0
),
4264 build_int_cst (exp_type
, 1));
4268 if (TREE_CODE (arg1
) != INTEGER_CST
)
4271 /* If flag_wrapv and ARG0_TYPE is signed, then we cannot
4272 move a constant to the other side. */
4273 if (!TYPE_UNSIGNED (arg0_type
)
4274 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4277 /* If EXP is signed, any overflow in the computation is undefined,
4278 so we don't worry about it so long as our computations on
4279 the bounds don't overflow. For unsigned, overflow is defined
4280 and this is exactly the right thing. */
4281 n_low
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
4282 arg0_type
, low
, 0, arg1
, 0);
4283 n_high
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
4284 arg0_type
, high
, 1, arg1
, 0);
4285 if ((n_low
!= 0 && TREE_OVERFLOW (n_low
))
4286 || (n_high
!= 0 && TREE_OVERFLOW (n_high
)))
4289 if (TYPE_OVERFLOW_UNDEFINED (arg0_type
))
4290 *strict_overflow_p
= true;
4293 /* Check for an unsigned range which has wrapped around the maximum
4294 value thus making n_high < n_low, and normalize it. */
4295 if (n_low
&& n_high
&& tree_int_cst_lt (n_high
, n_low
))
4297 low
= range_binop (PLUS_EXPR
, arg0_type
, n_high
, 0,
4298 build_int_cst (TREE_TYPE (n_high
), 1), 0);
4299 high
= range_binop (MINUS_EXPR
, arg0_type
, n_low
, 0,
4300 build_int_cst (TREE_TYPE (n_low
), 1), 0);
4302 /* If the range is of the form +/- [ x+1, x ], we won't
4303 be able to normalize it. But then, it represents the
4304 whole range or the empty set, so make it
4306 if (tree_int_cst_equal (n_low
, low
)
4307 && tree_int_cst_equal (n_high
, high
))
4313 low
= n_low
, high
= n_high
;
4321 case NON_LVALUE_EXPR
:
4322 if (TYPE_PRECISION (arg0_type
) > TYPE_PRECISION (exp_type
))
4325 if (! INTEGRAL_TYPE_P (arg0_type
)
4326 || (low
!= 0 && ! int_fits_type_p (low
, arg0_type
))
4327 || (high
!= 0 && ! int_fits_type_p (high
, arg0_type
)))
4330 n_low
= low
, n_high
= high
;
4333 n_low
= fold_convert_loc (loc
, arg0_type
, n_low
);
4336 n_high
= fold_convert_loc (loc
, arg0_type
, n_high
);
4338 /* If we're converting arg0 from an unsigned type, to exp,
4339 a signed type, we will be doing the comparison as unsigned.
4340 The tests above have already verified that LOW and HIGH
4343 So we have to ensure that we will handle large unsigned
4344 values the same way that the current signed bounds treat
4347 if (!TYPE_UNSIGNED (exp_type
) && TYPE_UNSIGNED (arg0_type
))
4351 /* For fixed-point modes, we need to pass the saturating flag
4352 as the 2nd parameter. */
4353 if (ALL_FIXED_POINT_MODE_P (TYPE_MODE (arg0_type
)))
4355 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
),
4356 TYPE_SATURATING (arg0_type
));
4359 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
), 1);
4361 /* A range without an upper bound is, naturally, unbounded.
4362 Since convert would have cropped a very large value, use
4363 the max value for the destination type. */
4365 = TYPE_MAX_VALUE (equiv_type
) ? TYPE_MAX_VALUE (equiv_type
)
4366 : TYPE_MAX_VALUE (arg0_type
);
4368 if (TYPE_PRECISION (exp_type
) == TYPE_PRECISION (arg0_type
))
4369 high_positive
= fold_build2_loc (loc
, RSHIFT_EXPR
, arg0_type
,
4370 fold_convert_loc (loc
, arg0_type
,
4372 build_int_cst (arg0_type
, 1));
4374 /* If the low bound is specified, "and" the range with the
4375 range for which the original unsigned value will be
4379 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 1, n_low
, n_high
,
4380 1, fold_convert_loc (loc
, arg0_type
,
4385 in_p
= (n_in_p
== in_p
);
4389 /* Otherwise, "or" the range with the range of the input
4390 that will be interpreted as negative. */
4391 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 0, n_low
, n_high
,
4392 1, fold_convert_loc (loc
, arg0_type
,
4397 in_p
= (in_p
!= n_in_p
);
4411 /* Given EXP, a logical expression, set the range it is testing into
4412 variables denoted by PIN_P, PLOW, and PHIGH. Return the expression
4413 actually being tested. *PLOW and *PHIGH will be made of the same
4414 type as the returned expression. If EXP is not a comparison, we
4415 will most likely not be returning a useful value and range. Set
4416 *STRICT_OVERFLOW_P to true if the return value is only valid
4417 because signed overflow is undefined; otherwise, do not change
4418 *STRICT_OVERFLOW_P. */
4421 make_range (tree exp
, int *pin_p
, tree
*plow
, tree
*phigh
,
4422 bool *strict_overflow_p
)
4424 enum tree_code code
;
4425 tree arg0
, arg1
= NULL_TREE
;
4426 tree exp_type
, nexp
;
4429 location_t loc
= EXPR_LOCATION (exp
);
4431 /* Start with simply saying "EXP != 0" and then look at the code of EXP
4432 and see if we can refine the range. Some of the cases below may not
4433 happen, but it doesn't seem worth worrying about this. We "continue"
4434 the outer loop when we've changed something; otherwise we "break"
4435 the switch, which will "break" the while. */
4438 low
= high
= build_int_cst (TREE_TYPE (exp
), 0);
4442 code
= TREE_CODE (exp
);
4443 exp_type
= TREE_TYPE (exp
);
4446 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
4448 if (TREE_OPERAND_LENGTH (exp
) > 0)
4449 arg0
= TREE_OPERAND (exp
, 0);
4450 if (TREE_CODE_CLASS (code
) == tcc_binary
4451 || TREE_CODE_CLASS (code
) == tcc_comparison
4452 || (TREE_CODE_CLASS (code
) == tcc_expression
4453 && TREE_OPERAND_LENGTH (exp
) > 1))
4454 arg1
= TREE_OPERAND (exp
, 1);
4456 if (arg0
== NULL_TREE
)
4459 nexp
= make_range_step (loc
, code
, arg0
, arg1
, exp_type
, &low
,
4460 &high
, &in_p
, strict_overflow_p
);
4461 if (nexp
== NULL_TREE
)
4466 /* If EXP is a constant, we can evaluate whether this is true or false. */
4467 if (TREE_CODE (exp
) == INTEGER_CST
)
4469 in_p
= in_p
== (integer_onep (range_binop (GE_EXPR
, integer_type_node
,
4471 && integer_onep (range_binop (LE_EXPR
, integer_type_node
,
4477 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
4481 /* Given a range, LOW, HIGH, and IN_P, an expression, EXP, and a result
4482 type, TYPE, return an expression to test if EXP is in (or out of, depending
4483 on IN_P) the range. Return 0 if the test couldn't be created. */
4486 build_range_check (location_t loc
, tree type
, tree exp
, int in_p
,
4487 tree low
, tree high
)
4489 tree etype
= TREE_TYPE (exp
), value
;
4491 /* Disable this optimization for function pointer expressions
4492 on targets that require function pointer canonicalization. */
4493 if (targetm
.have_canonicalize_funcptr_for_compare ()
4494 && TREE_CODE (etype
) == POINTER_TYPE
4495 && TREE_CODE (TREE_TYPE (etype
)) == FUNCTION_TYPE
)
4500 value
= build_range_check (loc
, type
, exp
, 1, low
, high
);
4502 return invert_truthvalue_loc (loc
, value
);
4507 if (low
== 0 && high
== 0)
4508 return omit_one_operand_loc (loc
, type
, build_int_cst (type
, 1), exp
);
4511 return fold_build2_loc (loc
, LE_EXPR
, type
, exp
,
4512 fold_convert_loc (loc
, etype
, high
));
4515 return fold_build2_loc (loc
, GE_EXPR
, type
, exp
,
4516 fold_convert_loc (loc
, etype
, low
));
4518 if (operand_equal_p (low
, high
, 0))
4519 return fold_build2_loc (loc
, EQ_EXPR
, type
, exp
,
4520 fold_convert_loc (loc
, etype
, low
));
4522 if (integer_zerop (low
))
4524 if (! TYPE_UNSIGNED (etype
))
4526 etype
= unsigned_type_for (etype
);
4527 high
= fold_convert_loc (loc
, etype
, high
);
4528 exp
= fold_convert_loc (loc
, etype
, exp
);
4530 return build_range_check (loc
, type
, exp
, 1, 0, high
);
4533 /* Optimize (c>=1) && (c<=127) into (signed char)c > 0. */
4534 if (integer_onep (low
) && TREE_CODE (high
) == INTEGER_CST
)
4536 int prec
= TYPE_PRECISION (etype
);
4538 if (wi::mask (prec
- 1, false, prec
) == high
)
4540 if (TYPE_UNSIGNED (etype
))
4542 tree signed_etype
= signed_type_for (etype
);
4543 if (TYPE_PRECISION (signed_etype
) != TYPE_PRECISION (etype
))
4545 = build_nonstandard_integer_type (TYPE_PRECISION (etype
), 0);
4547 etype
= signed_etype
;
4548 exp
= fold_convert_loc (loc
, etype
, exp
);
4550 return fold_build2_loc (loc
, GT_EXPR
, type
, exp
,
4551 build_int_cst (etype
, 0));
4555 /* Optimize (c>=low) && (c<=high) into (c-low>=0) && (c-low<=high-low).
4556 This requires wrap-around arithmetics for the type of the expression.
4557 First make sure that arithmetics in this type is valid, then make sure
4558 that it wraps around. */
4559 if (TREE_CODE (etype
) == ENUMERAL_TYPE
|| TREE_CODE (etype
) == BOOLEAN_TYPE
)
4560 etype
= lang_hooks
.types
.type_for_size (TYPE_PRECISION (etype
),
4561 TYPE_UNSIGNED (etype
));
4563 if (TREE_CODE (etype
) == INTEGER_TYPE
&& !TYPE_OVERFLOW_WRAPS (etype
))
4565 tree utype
, minv
, maxv
;
4567 /* Check if (unsigned) INT_MAX + 1 == (unsigned) INT_MIN
4568 for the type in question, as we rely on this here. */
4569 utype
= unsigned_type_for (etype
);
4570 maxv
= fold_convert_loc (loc
, utype
, TYPE_MAX_VALUE (etype
));
4571 maxv
= range_binop (PLUS_EXPR
, NULL_TREE
, maxv
, 1,
4572 build_int_cst (TREE_TYPE (maxv
), 1), 1);
4573 minv
= fold_convert_loc (loc
, utype
, TYPE_MIN_VALUE (etype
));
4575 if (integer_zerop (range_binop (NE_EXPR
, integer_type_node
,
4582 high
= fold_convert_loc (loc
, etype
, high
);
4583 low
= fold_convert_loc (loc
, etype
, low
);
4584 exp
= fold_convert_loc (loc
, etype
, exp
);
4586 value
= const_binop (MINUS_EXPR
, high
, low
);
4589 if (POINTER_TYPE_P (etype
))
4591 if (value
!= 0 && !TREE_OVERFLOW (value
))
4593 low
= fold_build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (low
), low
);
4594 return build_range_check (loc
, type
,
4595 fold_build_pointer_plus_loc (loc
, exp
, low
),
4596 1, build_int_cst (etype
, 0), value
);
4601 if (value
!= 0 && !TREE_OVERFLOW (value
))
4602 return build_range_check (loc
, type
,
4603 fold_build2_loc (loc
, MINUS_EXPR
, etype
, exp
, low
),
4604 1, build_int_cst (etype
, 0), value
);
4609 /* Return the predecessor of VAL in its type, handling the infinite case. */
4612 range_predecessor (tree val
)
4614 tree type
= TREE_TYPE (val
);
4616 if (INTEGRAL_TYPE_P (type
)
4617 && operand_equal_p (val
, TYPE_MIN_VALUE (type
), 0))
4620 return range_binop (MINUS_EXPR
, NULL_TREE
, val
, 0,
4621 build_int_cst (TREE_TYPE (val
), 1), 0);
4624 /* Return the successor of VAL in its type, handling the infinite case. */
4627 range_successor (tree val
)
4629 tree type
= TREE_TYPE (val
);
4631 if (INTEGRAL_TYPE_P (type
)
4632 && operand_equal_p (val
, TYPE_MAX_VALUE (type
), 0))
4635 return range_binop (PLUS_EXPR
, NULL_TREE
, val
, 0,
4636 build_int_cst (TREE_TYPE (val
), 1), 0);
4639 /* Given two ranges, see if we can merge them into one. Return 1 if we
4640 can, 0 if we can't. Set the output range into the specified parameters. */
4643 merge_ranges (int *pin_p
, tree
*plow
, tree
*phigh
, int in0_p
, tree low0
,
4644 tree high0
, int in1_p
, tree low1
, tree high1
)
4652 int lowequal
= ((low0
== 0 && low1
== 0)
4653 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
4654 low0
, 0, low1
, 0)));
4655 int highequal
= ((high0
== 0 && high1
== 0)
4656 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
4657 high0
, 1, high1
, 1)));
4659 /* Make range 0 be the range that starts first, or ends last if they
4660 start at the same value. Swap them if it isn't. */
4661 if (integer_onep (range_binop (GT_EXPR
, integer_type_node
,
4664 && integer_onep (range_binop (GT_EXPR
, integer_type_node
,
4665 high1
, 1, high0
, 1))))
4667 temp
= in0_p
, in0_p
= in1_p
, in1_p
= temp
;
4668 tem
= low0
, low0
= low1
, low1
= tem
;
4669 tem
= high0
, high0
= high1
, high1
= tem
;
4672 /* Now flag two cases, whether the ranges are disjoint or whether the
4673 second range is totally subsumed in the first. Note that the tests
4674 below are simplified by the ones above. */
4675 no_overlap
= integer_onep (range_binop (LT_EXPR
, integer_type_node
,
4676 high0
, 1, low1
, 0));
4677 subset
= integer_onep (range_binop (LE_EXPR
, integer_type_node
,
4678 high1
, 1, high0
, 1));
4680 /* We now have four cases, depending on whether we are including or
4681 excluding the two ranges. */
4684 /* If they don't overlap, the result is false. If the second range
4685 is a subset it is the result. Otherwise, the range is from the start
4686 of the second to the end of the first. */
4688 in_p
= 0, low
= high
= 0;
4690 in_p
= 1, low
= low1
, high
= high1
;
4692 in_p
= 1, low
= low1
, high
= high0
;
4695 else if (in0_p
&& ! in1_p
)
4697 /* If they don't overlap, the result is the first range. If they are
4698 equal, the result is false. If the second range is a subset of the
4699 first, and the ranges begin at the same place, we go from just after
4700 the end of the second range to the end of the first. If the second
4701 range is not a subset of the first, or if it is a subset and both
4702 ranges end at the same place, the range starts at the start of the
4703 first range and ends just before the second range.
4704 Otherwise, we can't describe this as a single range. */
4706 in_p
= 1, low
= low0
, high
= high0
;
4707 else if (lowequal
&& highequal
)
4708 in_p
= 0, low
= high
= 0;
4709 else if (subset
&& lowequal
)
4711 low
= range_successor (high1
);
4716 /* We are in the weird situation where high0 > high1 but
4717 high1 has no successor. Punt. */
4721 else if (! subset
|| highequal
)
4724 high
= range_predecessor (low1
);
4728 /* low0 < low1 but low1 has no predecessor. Punt. */
4736 else if (! in0_p
&& in1_p
)
4738 /* If they don't overlap, the result is the second range. If the second
4739 is a subset of the first, the result is false. Otherwise,
4740 the range starts just after the first range and ends at the
4741 end of the second. */
4743 in_p
= 1, low
= low1
, high
= high1
;
4744 else if (subset
|| highequal
)
4745 in_p
= 0, low
= high
= 0;
4748 low
= range_successor (high0
);
4753 /* high1 > high0 but high0 has no successor. Punt. */
4761 /* The case where we are excluding both ranges. Here the complex case
4762 is if they don't overlap. In that case, the only time we have a
4763 range is if they are adjacent. If the second is a subset of the
4764 first, the result is the first. Otherwise, the range to exclude
4765 starts at the beginning of the first range and ends at the end of the
4769 if (integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
4770 range_successor (high0
),
4772 in_p
= 0, low
= low0
, high
= high1
;
4775 /* Canonicalize - [min, x] into - [-, x]. */
4776 if (low0
&& TREE_CODE (low0
) == INTEGER_CST
)
4777 switch (TREE_CODE (TREE_TYPE (low0
)))
4780 if (TYPE_PRECISION (TREE_TYPE (low0
))
4781 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (low0
))))
4785 if (tree_int_cst_equal (low0
,
4786 TYPE_MIN_VALUE (TREE_TYPE (low0
))))
4790 if (TYPE_UNSIGNED (TREE_TYPE (low0
))
4791 && integer_zerop (low0
))
4798 /* Canonicalize - [x, max] into - [x, -]. */
4799 if (high1
&& TREE_CODE (high1
) == INTEGER_CST
)
4800 switch (TREE_CODE (TREE_TYPE (high1
)))
4803 if (TYPE_PRECISION (TREE_TYPE (high1
))
4804 != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (high1
))))
4808 if (tree_int_cst_equal (high1
,
4809 TYPE_MAX_VALUE (TREE_TYPE (high1
))))
4813 if (TYPE_UNSIGNED (TREE_TYPE (high1
))
4814 && integer_zerop (range_binop (PLUS_EXPR
, NULL_TREE
,
4816 build_int_cst (TREE_TYPE (high1
), 1),
4824 /* The ranges might be also adjacent between the maximum and
4825 minimum values of the given type. For
4826 - [{min,-}, x] and - [y, {max,-}] ranges where x + 1 < y
4827 return + [x + 1, y - 1]. */
4828 if (low0
== 0 && high1
== 0)
4830 low
= range_successor (high0
);
4831 high
= range_predecessor (low1
);
4832 if (low
== 0 || high
== 0)
4842 in_p
= 0, low
= low0
, high
= high0
;
4844 in_p
= 0, low
= low0
, high
= high1
;
4847 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
4852 /* Subroutine of fold, looking inside expressions of the form
4853 A op B ? A : C, where ARG0, ARG1 and ARG2 are the three operands
4854 of the COND_EXPR. This function is being used also to optimize
4855 A op B ? C : A, by reversing the comparison first.
4857 Return a folded expression whose code is not a COND_EXPR
4858 anymore, or NULL_TREE if no folding opportunity is found. */
4861 fold_cond_expr_with_comparison (location_t loc
, tree type
,
4862 tree arg0
, tree arg1
, tree arg2
)
4864 enum tree_code comp_code
= TREE_CODE (arg0
);
4865 tree arg00
= TREE_OPERAND (arg0
, 0);
4866 tree arg01
= TREE_OPERAND (arg0
, 1);
4867 tree arg1_type
= TREE_TYPE (arg1
);
4873 /* If we have A op 0 ? A : -A, consider applying the following
4876 A == 0? A : -A same as -A
4877 A != 0? A : -A same as A
4878 A >= 0? A : -A same as abs (A)
4879 A > 0? A : -A same as abs (A)
4880 A <= 0? A : -A same as -abs (A)
4881 A < 0? A : -A same as -abs (A)
4883 None of these transformations work for modes with signed
4884 zeros. If A is +/-0, the first two transformations will
4885 change the sign of the result (from +0 to -0, or vice
4886 versa). The last four will fix the sign of the result,
4887 even though the original expressions could be positive or
4888 negative, depending on the sign of A.
4890 Note that all these transformations are correct if A is
4891 NaN, since the two alternatives (A and -A) are also NaNs. */
4892 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
4893 && (FLOAT_TYPE_P (TREE_TYPE (arg01
))
4894 ? real_zerop (arg01
)
4895 : integer_zerop (arg01
))
4896 && ((TREE_CODE (arg2
) == NEGATE_EXPR
4897 && operand_equal_p (TREE_OPERAND (arg2
, 0), arg1
, 0))
4898 /* In the case that A is of the form X-Y, '-A' (arg2) may
4899 have already been folded to Y-X, check for that. */
4900 || (TREE_CODE (arg1
) == MINUS_EXPR
4901 && TREE_CODE (arg2
) == MINUS_EXPR
4902 && operand_equal_p (TREE_OPERAND (arg1
, 0),
4903 TREE_OPERAND (arg2
, 1), 0)
4904 && operand_equal_p (TREE_OPERAND (arg1
, 1),
4905 TREE_OPERAND (arg2
, 0), 0))))
4910 tem
= fold_convert_loc (loc
, arg1_type
, arg1
);
4911 return pedantic_non_lvalue_loc (loc
,
4912 fold_convert_loc (loc
, type
,
4913 negate_expr (tem
)));
4916 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
4919 if (flag_trapping_math
)
4924 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
4925 arg1
= fold_convert_loc (loc
, signed_type_for
4926 (TREE_TYPE (arg1
)), arg1
);
4927 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
4928 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
4931 if (flag_trapping_math
)
4935 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
4936 arg1
= fold_convert_loc (loc
, signed_type_for
4937 (TREE_TYPE (arg1
)), arg1
);
4938 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
4939 return negate_expr (fold_convert_loc (loc
, type
, tem
));
4941 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
4945 /* A != 0 ? A : 0 is simply A, unless A is -0. Likewise
4946 A == 0 ? A : 0 is always 0 unless A is -0. Note that
4947 both transformations are correct when A is NaN: A != 0
4948 is then true, and A == 0 is false. */
4950 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
4951 && integer_zerop (arg01
) && integer_zerop (arg2
))
4953 if (comp_code
== NE_EXPR
)
4954 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
4955 else if (comp_code
== EQ_EXPR
)
4956 return build_zero_cst (type
);
4959 /* Try some transformations of A op B ? A : B.
4961 A == B? A : B same as B
4962 A != B? A : B same as A
4963 A >= B? A : B same as max (A, B)
4964 A > B? A : B same as max (B, A)
4965 A <= B? A : B same as min (A, B)
4966 A < B? A : B same as min (B, A)
4968 As above, these transformations don't work in the presence
4969 of signed zeros. For example, if A and B are zeros of
4970 opposite sign, the first two transformations will change
4971 the sign of the result. In the last four, the original
4972 expressions give different results for (A=+0, B=-0) and
4973 (A=-0, B=+0), but the transformed expressions do not.
4975 The first two transformations are correct if either A or B
4976 is a NaN. In the first transformation, the condition will
4977 be false, and B will indeed be chosen. In the case of the
4978 second transformation, the condition A != B will be true,
4979 and A will be chosen.
4981 The conversions to max() and min() are not correct if B is
4982 a number and A is not. The conditions in the original
4983 expressions will be false, so all four give B. The min()
4984 and max() versions would give a NaN instead. */
4985 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
4986 && operand_equal_for_comparison_p (arg01
, arg2
, arg00
)
4987 /* Avoid these transformations if the COND_EXPR may be used
4988 as an lvalue in the C++ front-end. PR c++/19199. */
4990 || VECTOR_TYPE_P (type
)
4991 || (! lang_GNU_CXX ()
4992 && strcmp (lang_hooks
.name
, "GNU Objective-C++") != 0)
4993 || ! maybe_lvalue_p (arg1
)
4994 || ! maybe_lvalue_p (arg2
)))
4996 tree comp_op0
= arg00
;
4997 tree comp_op1
= arg01
;
4998 tree comp_type
= TREE_TYPE (comp_op0
);
5000 /* Avoid adding NOP_EXPRs in case this is an lvalue. */
5001 if (TYPE_MAIN_VARIANT (comp_type
) == TYPE_MAIN_VARIANT (type
))
5011 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg2
));
5013 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
5018 /* In C++ a ?: expression can be an lvalue, so put the
5019 operand which will be used if they are equal first
5020 so that we can convert this back to the
5021 corresponding COND_EXPR. */
5022 if (!HONOR_NANS (arg1
))
5024 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5025 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5026 tem
= (comp_code
== LE_EXPR
|| comp_code
== UNLE_EXPR
)
5027 ? fold_build2_loc (loc
, MIN_EXPR
, comp_type
, comp_op0
, comp_op1
)
5028 : fold_build2_loc (loc
, MIN_EXPR
, comp_type
,
5029 comp_op1
, comp_op0
);
5030 return pedantic_non_lvalue_loc (loc
,
5031 fold_convert_loc (loc
, type
, tem
));
5038 if (!HONOR_NANS (arg1
))
5040 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5041 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5042 tem
= (comp_code
== GE_EXPR
|| comp_code
== UNGE_EXPR
)
5043 ? fold_build2_loc (loc
, MAX_EXPR
, comp_type
, comp_op0
, comp_op1
)
5044 : fold_build2_loc (loc
, MAX_EXPR
, comp_type
,
5045 comp_op1
, comp_op0
);
5046 return pedantic_non_lvalue_loc (loc
,
5047 fold_convert_loc (loc
, type
, tem
));
5051 if (!HONOR_NANS (arg1
))
5052 return pedantic_non_lvalue_loc (loc
,
5053 fold_convert_loc (loc
, type
, arg2
));
5056 if (!HONOR_NANS (arg1
))
5057 return pedantic_non_lvalue_loc (loc
,
5058 fold_convert_loc (loc
, type
, arg1
));
5061 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5066 /* If this is A op C1 ? A : C2 with C1 and C2 constant integers,
5067 we might still be able to simplify this. For example,
5068 if C1 is one less or one more than C2, this might have started
5069 out as a MIN or MAX and been transformed by this function.
5070 Only good for INTEGER_TYPEs, because we need TYPE_MAX_VALUE. */
5072 if (INTEGRAL_TYPE_P (type
)
5073 && TREE_CODE (arg01
) == INTEGER_CST
5074 && TREE_CODE (arg2
) == INTEGER_CST
)
5078 if (TREE_CODE (arg1
) == INTEGER_CST
)
5080 /* We can replace A with C1 in this case. */
5081 arg1
= fold_convert_loc (loc
, type
, arg01
);
5082 return fold_build3_loc (loc
, COND_EXPR
, type
, arg0
, arg1
, arg2
);
5085 /* If C1 is C2 + 1, this is min(A, C2), but use ARG00's type for
5086 MIN_EXPR, to preserve the signedness of the comparison. */
5087 if (! operand_equal_p (arg2
, TYPE_MAX_VALUE (type
),
5089 && operand_equal_p (arg01
,
5090 const_binop (PLUS_EXPR
, arg2
,
5091 build_int_cst (type
, 1)),
5094 tem
= fold_build2_loc (loc
, MIN_EXPR
, TREE_TYPE (arg00
), arg00
,
5095 fold_convert_loc (loc
, TREE_TYPE (arg00
),
5097 return pedantic_non_lvalue_loc (loc
,
5098 fold_convert_loc (loc
, type
, tem
));
5103 /* If C1 is C2 - 1, this is min(A, C2), with the same care
5105 if (! operand_equal_p (arg2
, TYPE_MIN_VALUE (type
),
5107 && operand_equal_p (arg01
,
5108 const_binop (MINUS_EXPR
, arg2
,
5109 build_int_cst (type
, 1)),
5112 tem
= fold_build2_loc (loc
, MIN_EXPR
, TREE_TYPE (arg00
), arg00
,
5113 fold_convert_loc (loc
, TREE_TYPE (arg00
),
5115 return pedantic_non_lvalue_loc (loc
,
5116 fold_convert_loc (loc
, type
, tem
));
5121 /* If C1 is C2 - 1, this is max(A, C2), but use ARG00's type for
5122 MAX_EXPR, to preserve the signedness of the comparison. */
5123 if (! operand_equal_p (arg2
, TYPE_MIN_VALUE (type
),
5125 && operand_equal_p (arg01
,
5126 const_binop (MINUS_EXPR
, arg2
,
5127 build_int_cst (type
, 1)),
5130 tem
= fold_build2_loc (loc
, MAX_EXPR
, TREE_TYPE (arg00
), arg00
,
5131 fold_convert_loc (loc
, TREE_TYPE (arg00
),
5133 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
5138 /* If C1 is C2 + 1, this is max(A, C2), with the same care as above. */
5139 if (! operand_equal_p (arg2
, TYPE_MAX_VALUE (type
),
5141 && operand_equal_p (arg01
,
5142 const_binop (PLUS_EXPR
, arg2
,
5143 build_int_cst (type
, 1)),
5146 tem
= fold_build2_loc (loc
, MAX_EXPR
, TREE_TYPE (arg00
), arg00
,
5147 fold_convert_loc (loc
, TREE_TYPE (arg00
),
5149 return pedantic_non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
5163 #ifndef LOGICAL_OP_NON_SHORT_CIRCUIT
5164 #define LOGICAL_OP_NON_SHORT_CIRCUIT \
5165 (BRANCH_COST (optimize_function_for_speed_p (cfun), \
5169 /* EXP is some logical combination of boolean tests. See if we can
5170 merge it into some range test. Return the new tree if so. */
5173 fold_range_test (location_t loc
, enum tree_code code
, tree type
,
5176 int or_op
= (code
== TRUTH_ORIF_EXPR
5177 || code
== TRUTH_OR_EXPR
);
5178 int in0_p
, in1_p
, in_p
;
5179 tree low0
, low1
, low
, high0
, high1
, high
;
5180 bool strict_overflow_p
= false;
5182 const char * const warnmsg
= G_("assuming signed overflow does not occur "
5183 "when simplifying range test");
5185 if (!INTEGRAL_TYPE_P (type
))
5188 lhs
= make_range (op0
, &in0_p
, &low0
, &high0
, &strict_overflow_p
);
5189 rhs
= make_range (op1
, &in1_p
, &low1
, &high1
, &strict_overflow_p
);
5191 /* If this is an OR operation, invert both sides; we will invert
5192 again at the end. */
5194 in0_p
= ! in0_p
, in1_p
= ! in1_p
;
5196 /* If both expressions are the same, if we can merge the ranges, and we
5197 can build the range test, return it or it inverted. If one of the
5198 ranges is always true or always false, consider it to be the same
5199 expression as the other. */
5200 if ((lhs
== 0 || rhs
== 0 || operand_equal_p (lhs
, rhs
, 0))
5201 && merge_ranges (&in_p
, &low
, &high
, in0_p
, low0
, high0
,
5203 && 0 != (tem
= (build_range_check (loc
, type
,
5205 : rhs
!= 0 ? rhs
: integer_zero_node
,
5208 if (strict_overflow_p
)
5209 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
5210 return or_op
? invert_truthvalue_loc (loc
, tem
) : tem
;
5213 /* On machines where the branch cost is expensive, if this is a
5214 short-circuited branch and the underlying object on both sides
5215 is the same, make a non-short-circuit operation. */
5216 else if (LOGICAL_OP_NON_SHORT_CIRCUIT
5217 && lhs
!= 0 && rhs
!= 0
5218 && (code
== TRUTH_ANDIF_EXPR
5219 || code
== TRUTH_ORIF_EXPR
)
5220 && operand_equal_p (lhs
, rhs
, 0))
5222 /* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR
5223 unless we are at top level or LHS contains a PLACEHOLDER_EXPR, in
5224 which cases we can't do this. */
5225 if (simple_operand_p (lhs
))
5226 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5227 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5230 else if (!lang_hooks
.decls
.global_bindings_p ()
5231 && !CONTAINS_PLACEHOLDER_P (lhs
))
5233 tree common
= save_expr (lhs
);
5235 if (0 != (lhs
= build_range_check (loc
, type
, common
,
5236 or_op
? ! in0_p
: in0_p
,
5238 && (0 != (rhs
= build_range_check (loc
, type
, common
,
5239 or_op
? ! in1_p
: in1_p
,
5242 if (strict_overflow_p
)
5243 fold_overflow_warning (warnmsg
,
5244 WARN_STRICT_OVERFLOW_COMPARISON
);
5245 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5246 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5255 /* Subroutine for fold_truth_andor_1: C is an INTEGER_CST interpreted as a P
5256 bit value. Arrange things so the extra bits will be set to zero if and
5257 only if C is signed-extended to its full width. If MASK is nonzero,
5258 it is an INTEGER_CST that should be AND'ed with the extra bits. */
5261 unextend (tree c
, int p
, int unsignedp
, tree mask
)
5263 tree type
= TREE_TYPE (c
);
5264 int modesize
= GET_MODE_BITSIZE (TYPE_MODE (type
));
5267 if (p
== modesize
|| unsignedp
)
5270 /* We work by getting just the sign bit into the low-order bit, then
5271 into the high-order bit, then sign-extend. We then XOR that value
5273 temp
= build_int_cst (TREE_TYPE (c
), wi::extract_uhwi (c
, p
- 1, 1));
5275 /* We must use a signed type in order to get an arithmetic right shift.
5276 However, we must also avoid introducing accidental overflows, so that
5277 a subsequent call to integer_zerop will work. Hence we must
5278 do the type conversion here. At this point, the constant is either
5279 zero or one, and the conversion to a signed type can never overflow.
5280 We could get an overflow if this conversion is done anywhere else. */
5281 if (TYPE_UNSIGNED (type
))
5282 temp
= fold_convert (signed_type_for (type
), temp
);
5284 temp
= const_binop (LSHIFT_EXPR
, temp
, size_int (modesize
- 1));
5285 temp
= const_binop (RSHIFT_EXPR
, temp
, size_int (modesize
- p
- 1));
5287 temp
= const_binop (BIT_AND_EXPR
, temp
,
5288 fold_convert (TREE_TYPE (c
), mask
));
5289 /* If necessary, convert the type back to match the type of C. */
5290 if (TYPE_UNSIGNED (type
))
5291 temp
= fold_convert (type
, temp
);
5293 return fold_convert (type
, const_binop (BIT_XOR_EXPR
, c
, temp
));
5296 /* For an expression that has the form
5300 we can drop one of the inner expressions and simplify to
5304 LOC is the location of the resulting expression. OP is the inner
5305 logical operation; the left-hand side in the examples above, while CMPOP
5306 is the right-hand side. RHS_ONLY is used to prevent us from accidentally
5307 removing a condition that guards another, as in
5308 (A != NULL && A->...) || A == NULL
5309 which we must not transform. If RHS_ONLY is true, only eliminate the
5310 right-most operand of the inner logical operation. */
5313 merge_truthop_with_opposite_arm (location_t loc
, tree op
, tree cmpop
,
5316 tree type
= TREE_TYPE (cmpop
);
5317 enum tree_code code
= TREE_CODE (cmpop
);
5318 enum tree_code truthop_code
= TREE_CODE (op
);
5319 tree lhs
= TREE_OPERAND (op
, 0);
5320 tree rhs
= TREE_OPERAND (op
, 1);
5321 tree orig_lhs
= lhs
, orig_rhs
= rhs
;
5322 enum tree_code rhs_code
= TREE_CODE (rhs
);
5323 enum tree_code lhs_code
= TREE_CODE (lhs
);
5324 enum tree_code inv_code
;
5326 if (TREE_SIDE_EFFECTS (op
) || TREE_SIDE_EFFECTS (cmpop
))
5329 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
5332 if (rhs_code
== truthop_code
)
5334 tree newrhs
= merge_truthop_with_opposite_arm (loc
, rhs
, cmpop
, rhs_only
);
5335 if (newrhs
!= NULL_TREE
)
5338 rhs_code
= TREE_CODE (rhs
);
5341 if (lhs_code
== truthop_code
&& !rhs_only
)
5343 tree newlhs
= merge_truthop_with_opposite_arm (loc
, lhs
, cmpop
, false);
5344 if (newlhs
!= NULL_TREE
)
5347 lhs_code
= TREE_CODE (lhs
);
5351 inv_code
= invert_tree_comparison (code
, HONOR_NANS (type
));
5352 if (inv_code
== rhs_code
5353 && operand_equal_p (TREE_OPERAND (rhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
5354 && operand_equal_p (TREE_OPERAND (rhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
5356 if (!rhs_only
&& inv_code
== lhs_code
5357 && operand_equal_p (TREE_OPERAND (lhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
5358 && operand_equal_p (TREE_OPERAND (lhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
5360 if (rhs
!= orig_rhs
|| lhs
!= orig_lhs
)
5361 return fold_build2_loc (loc
, truthop_code
, TREE_TYPE (cmpop
),
5366 /* Find ways of folding logical expressions of LHS and RHS:
5367 Try to merge two comparisons to the same innermost item.
5368 Look for range tests like "ch >= '0' && ch <= '9'".
5369 Look for combinations of simple terms on machines with expensive branches
5370 and evaluate the RHS unconditionally.
5372 For example, if we have p->a == 2 && p->b == 4 and we can make an
5373 object large enough to span both A and B, we can do this with a comparison
5374 against the object ANDed with the a mask.
5376 If we have p->a == q->a && p->b == q->b, we may be able to use bit masking
5377 operations to do this with one comparison.
5379 We check for both normal comparisons and the BIT_AND_EXPRs made this by
5380 function and the one above.
5382 CODE is the logical operation being done. It can be TRUTH_ANDIF_EXPR,
5383 TRUTH_AND_EXPR, TRUTH_ORIF_EXPR, or TRUTH_OR_EXPR.
5385 TRUTH_TYPE is the type of the logical operand and LHS and RHS are its
5388 We return the simplified tree or 0 if no optimization is possible. */
5391 fold_truth_andor_1 (location_t loc
, enum tree_code code
, tree truth_type
,
5394 /* If this is the "or" of two comparisons, we can do something if
5395 the comparisons are NE_EXPR. If this is the "and", we can do something
5396 if the comparisons are EQ_EXPR. I.e.,
5397 (a->b == 2 && a->c == 4) can become (a->new == NEW).
5399 WANTED_CODE is this operation code. For single bit fields, we can
5400 convert EQ_EXPR to NE_EXPR so we need not reject the "wrong"
5401 comparison for one-bit fields. */
5403 enum tree_code wanted_code
;
5404 enum tree_code lcode
, rcode
;
5405 tree ll_arg
, lr_arg
, rl_arg
, rr_arg
;
5406 tree ll_inner
, lr_inner
, rl_inner
, rr_inner
;
5407 HOST_WIDE_INT ll_bitsize
, ll_bitpos
, lr_bitsize
, lr_bitpos
;
5408 HOST_WIDE_INT rl_bitsize
, rl_bitpos
, rr_bitsize
, rr_bitpos
;
5409 HOST_WIDE_INT xll_bitpos
, xlr_bitpos
, xrl_bitpos
, xrr_bitpos
;
5410 HOST_WIDE_INT lnbitsize
, lnbitpos
, rnbitsize
, rnbitpos
;
5411 int ll_unsignedp
, lr_unsignedp
, rl_unsignedp
, rr_unsignedp
;
5412 machine_mode ll_mode
, lr_mode
, rl_mode
, rr_mode
;
5413 machine_mode lnmode
, rnmode
;
5414 tree ll_mask
, lr_mask
, rl_mask
, rr_mask
;
5415 tree ll_and_mask
, lr_and_mask
, rl_and_mask
, rr_and_mask
;
5416 tree l_const
, r_const
;
5417 tree lntype
, rntype
, result
;
5418 HOST_WIDE_INT first_bit
, end_bit
;
5421 /* Start by getting the comparison codes. Fail if anything is volatile.
5422 If one operand is a BIT_AND_EXPR with the constant one, treat it as if
5423 it were surrounded with a NE_EXPR. */
5425 if (TREE_SIDE_EFFECTS (lhs
) || TREE_SIDE_EFFECTS (rhs
))
5428 lcode
= TREE_CODE (lhs
);
5429 rcode
= TREE_CODE (rhs
);
5431 if (lcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (lhs
, 1)))
5433 lhs
= build2 (NE_EXPR
, truth_type
, lhs
,
5434 build_int_cst (TREE_TYPE (lhs
), 0));
5438 if (rcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (rhs
, 1)))
5440 rhs
= build2 (NE_EXPR
, truth_type
, rhs
,
5441 build_int_cst (TREE_TYPE (rhs
), 0));
5445 if (TREE_CODE_CLASS (lcode
) != tcc_comparison
5446 || TREE_CODE_CLASS (rcode
) != tcc_comparison
)
5449 ll_arg
= TREE_OPERAND (lhs
, 0);
5450 lr_arg
= TREE_OPERAND (lhs
, 1);
5451 rl_arg
= TREE_OPERAND (rhs
, 0);
5452 rr_arg
= TREE_OPERAND (rhs
, 1);
5454 /* Simplify (x<y) && (x==y) into (x<=y) and related optimizations. */
5455 if (simple_operand_p (ll_arg
)
5456 && simple_operand_p (lr_arg
))
5458 if (operand_equal_p (ll_arg
, rl_arg
, 0)
5459 && operand_equal_p (lr_arg
, rr_arg
, 0))
5461 result
= combine_comparisons (loc
, code
, lcode
, rcode
,
5462 truth_type
, ll_arg
, lr_arg
);
5466 else if (operand_equal_p (ll_arg
, rr_arg
, 0)
5467 && operand_equal_p (lr_arg
, rl_arg
, 0))
5469 result
= combine_comparisons (loc
, code
, lcode
,
5470 swap_tree_comparison (rcode
),
5471 truth_type
, ll_arg
, lr_arg
);
5477 code
= ((code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
)
5478 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
);
5480 /* If the RHS can be evaluated unconditionally and its operands are
5481 simple, it wins to evaluate the RHS unconditionally on machines
5482 with expensive branches. In this case, this isn't a comparison
5483 that can be merged. */
5485 if (BRANCH_COST (optimize_function_for_speed_p (cfun
),
5487 && ! FLOAT_TYPE_P (TREE_TYPE (rl_arg
))
5488 && simple_operand_p (rl_arg
)
5489 && simple_operand_p (rr_arg
))
5491 /* Convert (a != 0) || (b != 0) into (a | b) != 0. */
5492 if (code
== TRUTH_OR_EXPR
5493 && lcode
== NE_EXPR
&& integer_zerop (lr_arg
)
5494 && rcode
== NE_EXPR
&& integer_zerop (rr_arg
)
5495 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
5496 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
5497 return build2_loc (loc
, NE_EXPR
, truth_type
,
5498 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
5500 build_int_cst (TREE_TYPE (ll_arg
), 0));
5502 /* Convert (a == 0) && (b == 0) into (a | b) == 0. */
5503 if (code
== TRUTH_AND_EXPR
5504 && lcode
== EQ_EXPR
&& integer_zerop (lr_arg
)
5505 && rcode
== EQ_EXPR
&& integer_zerop (rr_arg
)
5506 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
5507 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
5508 return build2_loc (loc
, EQ_EXPR
, truth_type
,
5509 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
5511 build_int_cst (TREE_TYPE (ll_arg
), 0));
5514 /* See if the comparisons can be merged. Then get all the parameters for
5517 if ((lcode
!= EQ_EXPR
&& lcode
!= NE_EXPR
)
5518 || (rcode
!= EQ_EXPR
&& rcode
!= NE_EXPR
))
5522 ll_inner
= decode_field_reference (loc
, ll_arg
,
5523 &ll_bitsize
, &ll_bitpos
, &ll_mode
,
5524 &ll_unsignedp
, &volatilep
, &ll_mask
,
5526 lr_inner
= decode_field_reference (loc
, lr_arg
,
5527 &lr_bitsize
, &lr_bitpos
, &lr_mode
,
5528 &lr_unsignedp
, &volatilep
, &lr_mask
,
5530 rl_inner
= decode_field_reference (loc
, rl_arg
,
5531 &rl_bitsize
, &rl_bitpos
, &rl_mode
,
5532 &rl_unsignedp
, &volatilep
, &rl_mask
,
5534 rr_inner
= decode_field_reference (loc
, rr_arg
,
5535 &rr_bitsize
, &rr_bitpos
, &rr_mode
,
5536 &rr_unsignedp
, &volatilep
, &rr_mask
,
5539 /* It must be true that the inner operation on the lhs of each
5540 comparison must be the same if we are to be able to do anything.
5541 Then see if we have constants. If not, the same must be true for
5543 if (volatilep
|| ll_inner
== 0 || rl_inner
== 0
5544 || ! operand_equal_p (ll_inner
, rl_inner
, 0))
5547 if (TREE_CODE (lr_arg
) == INTEGER_CST
5548 && TREE_CODE (rr_arg
) == INTEGER_CST
)
5549 l_const
= lr_arg
, r_const
= rr_arg
;
5550 else if (lr_inner
== 0 || rr_inner
== 0
5551 || ! operand_equal_p (lr_inner
, rr_inner
, 0))
5554 l_const
= r_const
= 0;
5556 /* If either comparison code is not correct for our logical operation,
5557 fail. However, we can convert a one-bit comparison against zero into
5558 the opposite comparison against that bit being set in the field. */
5560 wanted_code
= (code
== TRUTH_AND_EXPR
? EQ_EXPR
: NE_EXPR
);
5561 if (lcode
!= wanted_code
)
5563 if (l_const
&& integer_zerop (l_const
) && integer_pow2p (ll_mask
))
5565 /* Make the left operand unsigned, since we are only interested
5566 in the value of one bit. Otherwise we are doing the wrong
5575 /* This is analogous to the code for l_const above. */
5576 if (rcode
!= wanted_code
)
5578 if (r_const
&& integer_zerop (r_const
) && integer_pow2p (rl_mask
))
5587 /* See if we can find a mode that contains both fields being compared on
5588 the left. If we can't, fail. Otherwise, update all constants and masks
5589 to be relative to a field of that size. */
5590 first_bit
= MIN (ll_bitpos
, rl_bitpos
);
5591 end_bit
= MAX (ll_bitpos
+ ll_bitsize
, rl_bitpos
+ rl_bitsize
);
5592 lnmode
= get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
5593 TYPE_ALIGN (TREE_TYPE (ll_inner
)), word_mode
,
5595 if (lnmode
== VOIDmode
)
5598 lnbitsize
= GET_MODE_BITSIZE (lnmode
);
5599 lnbitpos
= first_bit
& ~ (lnbitsize
- 1);
5600 lntype
= lang_hooks
.types
.type_for_size (lnbitsize
, 1);
5601 xll_bitpos
= ll_bitpos
- lnbitpos
, xrl_bitpos
= rl_bitpos
- lnbitpos
;
5603 if (BYTES_BIG_ENDIAN
)
5605 xll_bitpos
= lnbitsize
- xll_bitpos
- ll_bitsize
;
5606 xrl_bitpos
= lnbitsize
- xrl_bitpos
- rl_bitsize
;
5609 ll_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, ll_mask
),
5610 size_int (xll_bitpos
));
5611 rl_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, rl_mask
),
5612 size_int (xrl_bitpos
));
5616 l_const
= fold_convert_loc (loc
, lntype
, l_const
);
5617 l_const
= unextend (l_const
, ll_bitsize
, ll_unsignedp
, ll_and_mask
);
5618 l_const
= const_binop (LSHIFT_EXPR
, l_const
, size_int (xll_bitpos
));
5619 if (! integer_zerop (const_binop (BIT_AND_EXPR
, l_const
,
5620 fold_build1_loc (loc
, BIT_NOT_EXPR
,
5623 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
5625 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
5630 r_const
= fold_convert_loc (loc
, lntype
, r_const
);
5631 r_const
= unextend (r_const
, rl_bitsize
, rl_unsignedp
, rl_and_mask
);
5632 r_const
= const_binop (LSHIFT_EXPR
, r_const
, size_int (xrl_bitpos
));
5633 if (! integer_zerop (const_binop (BIT_AND_EXPR
, r_const
,
5634 fold_build1_loc (loc
, BIT_NOT_EXPR
,
5637 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
5639 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
5643 /* If the right sides are not constant, do the same for it. Also,
5644 disallow this optimization if a size or signedness mismatch occurs
5645 between the left and right sides. */
5648 if (ll_bitsize
!= lr_bitsize
|| rl_bitsize
!= rr_bitsize
5649 || ll_unsignedp
!= lr_unsignedp
|| rl_unsignedp
!= rr_unsignedp
5650 /* Make sure the two fields on the right
5651 correspond to the left without being swapped. */
5652 || ll_bitpos
- rl_bitpos
!= lr_bitpos
- rr_bitpos
)
5655 first_bit
= MIN (lr_bitpos
, rr_bitpos
);
5656 end_bit
= MAX (lr_bitpos
+ lr_bitsize
, rr_bitpos
+ rr_bitsize
);
5657 rnmode
= get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
5658 TYPE_ALIGN (TREE_TYPE (lr_inner
)), word_mode
,
5660 if (rnmode
== VOIDmode
)
5663 rnbitsize
= GET_MODE_BITSIZE (rnmode
);
5664 rnbitpos
= first_bit
& ~ (rnbitsize
- 1);
5665 rntype
= lang_hooks
.types
.type_for_size (rnbitsize
, 1);
5666 xlr_bitpos
= lr_bitpos
- rnbitpos
, xrr_bitpos
= rr_bitpos
- rnbitpos
;
5668 if (BYTES_BIG_ENDIAN
)
5670 xlr_bitpos
= rnbitsize
- xlr_bitpos
- lr_bitsize
;
5671 xrr_bitpos
= rnbitsize
- xrr_bitpos
- rr_bitsize
;
5674 lr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
5676 size_int (xlr_bitpos
));
5677 rr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
5679 size_int (xrr_bitpos
));
5681 /* Make a mask that corresponds to both fields being compared.
5682 Do this for both items being compared. If the operands are the
5683 same size and the bits being compared are in the same position
5684 then we can do this by masking both and comparing the masked
5686 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
5687 lr_mask
= const_binop (BIT_IOR_EXPR
, lr_mask
, rr_mask
);
5688 if (lnbitsize
== rnbitsize
&& xll_bitpos
== xlr_bitpos
)
5690 lhs
= make_bit_field_ref (loc
, ll_inner
, lntype
, lnbitsize
, lnbitpos
,
5691 ll_unsignedp
|| rl_unsignedp
);
5692 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
5693 lhs
= build2 (BIT_AND_EXPR
, lntype
, lhs
, ll_mask
);
5695 rhs
= make_bit_field_ref (loc
, lr_inner
, rntype
, rnbitsize
, rnbitpos
,
5696 lr_unsignedp
|| rr_unsignedp
);
5697 if (! all_ones_mask_p (lr_mask
, rnbitsize
))
5698 rhs
= build2 (BIT_AND_EXPR
, rntype
, rhs
, lr_mask
);
5700 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
5703 /* There is still another way we can do something: If both pairs of
5704 fields being compared are adjacent, we may be able to make a wider
5705 field containing them both.
5707 Note that we still must mask the lhs/rhs expressions. Furthermore,
5708 the mask must be shifted to account for the shift done by
5709 make_bit_field_ref. */
5710 if ((ll_bitsize
+ ll_bitpos
== rl_bitpos
5711 && lr_bitsize
+ lr_bitpos
== rr_bitpos
)
5712 || (ll_bitpos
== rl_bitpos
+ rl_bitsize
5713 && lr_bitpos
== rr_bitpos
+ rr_bitsize
))
5717 lhs
= make_bit_field_ref (loc
, ll_inner
, lntype
,
5718 ll_bitsize
+ rl_bitsize
,
5719 MIN (ll_bitpos
, rl_bitpos
), ll_unsignedp
);
5720 rhs
= make_bit_field_ref (loc
, lr_inner
, rntype
,
5721 lr_bitsize
+ rr_bitsize
,
5722 MIN (lr_bitpos
, rr_bitpos
), lr_unsignedp
);
5724 ll_mask
= const_binop (RSHIFT_EXPR
, ll_mask
,
5725 size_int (MIN (xll_bitpos
, xrl_bitpos
)));
5726 lr_mask
= const_binop (RSHIFT_EXPR
, lr_mask
,
5727 size_int (MIN (xlr_bitpos
, xrr_bitpos
)));
5729 /* Convert to the smaller type before masking out unwanted bits. */
5731 if (lntype
!= rntype
)
5733 if (lnbitsize
> rnbitsize
)
5735 lhs
= fold_convert_loc (loc
, rntype
, lhs
);
5736 ll_mask
= fold_convert_loc (loc
, rntype
, ll_mask
);
5739 else if (lnbitsize
< rnbitsize
)
5741 rhs
= fold_convert_loc (loc
, lntype
, rhs
);
5742 lr_mask
= fold_convert_loc (loc
, lntype
, lr_mask
);
5747 if (! all_ones_mask_p (ll_mask
, ll_bitsize
+ rl_bitsize
))
5748 lhs
= build2 (BIT_AND_EXPR
, type
, lhs
, ll_mask
);
5750 if (! all_ones_mask_p (lr_mask
, lr_bitsize
+ rr_bitsize
))
5751 rhs
= build2 (BIT_AND_EXPR
, type
, rhs
, lr_mask
);
5753 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
5759 /* Handle the case of comparisons with constants. If there is something in
5760 common between the masks, those bits of the constants must be the same.
5761 If not, the condition is always false. Test for this to avoid generating
5762 incorrect code below. */
5763 result
= const_binop (BIT_AND_EXPR
, ll_mask
, rl_mask
);
5764 if (! integer_zerop (result
)
5765 && simple_cst_equal (const_binop (BIT_AND_EXPR
, result
, l_const
),
5766 const_binop (BIT_AND_EXPR
, result
, r_const
)) != 1)
5768 if (wanted_code
== NE_EXPR
)
5770 warning (0, "%<or%> of unmatched not-equal tests is always 1");
5771 return constant_boolean_node (true, truth_type
);
5775 warning (0, "%<and%> of mutually exclusive equal-tests is always 0");
5776 return constant_boolean_node (false, truth_type
);
5780 /* Construct the expression we will return. First get the component
5781 reference we will make. Unless the mask is all ones the width of
5782 that field, perform the mask operation. Then compare with the
5784 result
= make_bit_field_ref (loc
, ll_inner
, lntype
, lnbitsize
, lnbitpos
,
5785 ll_unsignedp
|| rl_unsignedp
);
5787 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
5788 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
5789 result
= build2_loc (loc
, BIT_AND_EXPR
, lntype
, result
, ll_mask
);
5791 return build2_loc (loc
, wanted_code
, truth_type
, result
,
5792 const_binop (BIT_IOR_EXPR
, l_const
, r_const
));
5795 /* Optimize T, which is a comparison of a MIN_EXPR or MAX_EXPR with a
5799 optimize_minmax_comparison (location_t loc
, enum tree_code code
, tree type
,
5803 enum tree_code op_code
;
5806 int consts_equal
, consts_lt
;
5809 STRIP_SIGN_NOPS (arg0
);
5811 op_code
= TREE_CODE (arg0
);
5812 minmax_const
= TREE_OPERAND (arg0
, 1);
5813 comp_const
= fold_convert_loc (loc
, TREE_TYPE (arg0
), op1
);
5814 consts_equal
= tree_int_cst_equal (minmax_const
, comp_const
);
5815 consts_lt
= tree_int_cst_lt (minmax_const
, comp_const
);
5816 inner
= TREE_OPERAND (arg0
, 0);
5818 /* If something does not permit us to optimize, return the original tree. */
5819 if ((op_code
!= MIN_EXPR
&& op_code
!= MAX_EXPR
)
5820 || TREE_CODE (comp_const
) != INTEGER_CST
5821 || TREE_OVERFLOW (comp_const
)
5822 || TREE_CODE (minmax_const
) != INTEGER_CST
5823 || TREE_OVERFLOW (minmax_const
))
5826 /* Now handle all the various comparison codes. We only handle EQ_EXPR
5827 and GT_EXPR, doing the rest with recursive calls using logical
5831 case NE_EXPR
: case LT_EXPR
: case LE_EXPR
:
5834 = optimize_minmax_comparison (loc
,
5835 invert_tree_comparison (code
, false),
5838 return invert_truthvalue_loc (loc
, tem
);
5844 fold_build2_loc (loc
, TRUTH_ORIF_EXPR
, type
,
5845 optimize_minmax_comparison
5846 (loc
, EQ_EXPR
, type
, arg0
, comp_const
),
5847 optimize_minmax_comparison
5848 (loc
, GT_EXPR
, type
, arg0
, comp_const
));
5851 if (op_code
== MAX_EXPR
&& consts_equal
)
5852 /* MAX (X, 0) == 0 -> X <= 0 */
5853 return fold_build2_loc (loc
, LE_EXPR
, type
, inner
, comp_const
);
5855 else if (op_code
== MAX_EXPR
&& consts_lt
)
5856 /* MAX (X, 0) == 5 -> X == 5 */
5857 return fold_build2_loc (loc
, EQ_EXPR
, type
, inner
, comp_const
);
5859 else if (op_code
== MAX_EXPR
)
5860 /* MAX (X, 0) == -1 -> false */
5861 return omit_one_operand_loc (loc
, type
, integer_zero_node
, inner
);
5863 else if (consts_equal
)
5864 /* MIN (X, 0) == 0 -> X >= 0 */
5865 return fold_build2_loc (loc
, GE_EXPR
, type
, inner
, comp_const
);
5868 /* MIN (X, 0) == 5 -> false */
5869 return omit_one_operand_loc (loc
, type
, integer_zero_node
, inner
);
5872 /* MIN (X, 0) == -1 -> X == -1 */
5873 return fold_build2_loc (loc
, EQ_EXPR
, type
, inner
, comp_const
);
5876 if (op_code
== MAX_EXPR
&& (consts_equal
|| consts_lt
))
5877 /* MAX (X, 0) > 0 -> X > 0
5878 MAX (X, 0) > 5 -> X > 5 */
5879 return fold_build2_loc (loc
, GT_EXPR
, type
, inner
, comp_const
);
5881 else if (op_code
== MAX_EXPR
)
5882 /* MAX (X, 0) > -1 -> true */
5883 return omit_one_operand_loc (loc
, type
, integer_one_node
, inner
);
5885 else if (op_code
== MIN_EXPR
&& (consts_equal
|| consts_lt
))
5886 /* MIN (X, 0) > 0 -> false
5887 MIN (X, 0) > 5 -> false */
5888 return omit_one_operand_loc (loc
, type
, integer_zero_node
, inner
);
5891 /* MIN (X, 0) > -1 -> X > -1 */
5892 return fold_build2_loc (loc
, GT_EXPR
, type
, inner
, comp_const
);
5899 /* T is an integer expression that is being multiplied, divided, or taken a
5900 modulus (CODE says which and what kind of divide or modulus) by a
5901 constant C. See if we can eliminate that operation by folding it with
5902 other operations already in T. WIDE_TYPE, if non-null, is a type that
5903 should be used for the computation if wider than our type.
5905 For example, if we are dividing (X * 8) + (Y * 16) by 4, we can return
5906 (X * 2) + (Y * 4). We must, however, be assured that either the original
5907 expression would not overflow or that overflow is undefined for the type
5908 in the language in question.
5910 If we return a non-null expression, it is an equivalent form of the
5911 original computation, but need not be in the original type.
5913 We set *STRICT_OVERFLOW_P to true if the return values depends on
5914 signed overflow being undefined. Otherwise we do not change
5915 *STRICT_OVERFLOW_P. */
5918 extract_muldiv (tree t
, tree c
, enum tree_code code
, tree wide_type
,
5919 bool *strict_overflow_p
)
5921 /* To avoid exponential search depth, refuse to allow recursion past
5922 three levels. Beyond that (1) it's highly unlikely that we'll find
5923 something interesting and (2) we've probably processed it before
5924 when we built the inner expression. */
5933 ret
= extract_muldiv_1 (t
, c
, code
, wide_type
, strict_overflow_p
);
5940 extract_muldiv_1 (tree t
, tree c
, enum tree_code code
, tree wide_type
,
5941 bool *strict_overflow_p
)
5943 tree type
= TREE_TYPE (t
);
5944 enum tree_code tcode
= TREE_CODE (t
);
5945 tree ctype
= (wide_type
!= 0 && (GET_MODE_SIZE (TYPE_MODE (wide_type
))
5946 > GET_MODE_SIZE (TYPE_MODE (type
)))
5947 ? wide_type
: type
);
5949 int same_p
= tcode
== code
;
5950 tree op0
= NULL_TREE
, op1
= NULL_TREE
;
5951 bool sub_strict_overflow_p
;
5953 /* Don't deal with constants of zero here; they confuse the code below. */
5954 if (integer_zerop (c
))
5957 if (TREE_CODE_CLASS (tcode
) == tcc_unary
)
5958 op0
= TREE_OPERAND (t
, 0);
5960 if (TREE_CODE_CLASS (tcode
) == tcc_binary
)
5961 op0
= TREE_OPERAND (t
, 0), op1
= TREE_OPERAND (t
, 1);
5963 /* Note that we need not handle conditional operations here since fold
5964 already handles those cases. So just do arithmetic here. */
5968 /* For a constant, we can always simplify if we are a multiply
5969 or (for divide and modulus) if it is a multiple of our constant. */
5970 if (code
== MULT_EXPR
5971 || wi::multiple_of_p (t
, c
, TYPE_SIGN (type
)))
5972 return const_binop (code
, fold_convert (ctype
, t
),
5973 fold_convert (ctype
, c
));
5976 CASE_CONVERT
: case NON_LVALUE_EXPR
:
5977 /* If op0 is an expression ... */
5978 if ((COMPARISON_CLASS_P (op0
)
5979 || UNARY_CLASS_P (op0
)
5980 || BINARY_CLASS_P (op0
)
5981 || VL_EXP_CLASS_P (op0
)
5982 || EXPRESSION_CLASS_P (op0
))
5983 /* ... and has wrapping overflow, and its type is smaller
5984 than ctype, then we cannot pass through as widening. */
5985 && (((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
5986 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (op0
)))
5987 && (TYPE_PRECISION (ctype
)
5988 > TYPE_PRECISION (TREE_TYPE (op0
))))
5989 /* ... or this is a truncation (t is narrower than op0),
5990 then we cannot pass through this narrowing. */
5991 || (TYPE_PRECISION (type
)
5992 < TYPE_PRECISION (TREE_TYPE (op0
)))
5993 /* ... or signedness changes for division or modulus,
5994 then we cannot pass through this conversion. */
5995 || (code
!= MULT_EXPR
5996 && (TYPE_UNSIGNED (ctype
)
5997 != TYPE_UNSIGNED (TREE_TYPE (op0
))))
5998 /* ... or has undefined overflow while the converted to
5999 type has not, we cannot do the operation in the inner type
6000 as that would introduce undefined overflow. */
6001 || ((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6002 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0
)))
6003 && !TYPE_OVERFLOW_UNDEFINED (type
))))
6006 /* Pass the constant down and see if we can make a simplification. If
6007 we can, replace this expression with the inner simplification for
6008 possible later conversion to our or some other type. */
6009 if ((t2
= fold_convert (TREE_TYPE (op0
), c
)) != 0
6010 && TREE_CODE (t2
) == INTEGER_CST
6011 && !TREE_OVERFLOW (t2
)
6012 && (0 != (t1
= extract_muldiv (op0
, t2
, code
,
6014 ? ctype
: NULL_TREE
,
6015 strict_overflow_p
))))
6020 /* If widening the type changes it from signed to unsigned, then we
6021 must avoid building ABS_EXPR itself as unsigned. */
6022 if (TYPE_UNSIGNED (ctype
) && !TYPE_UNSIGNED (type
))
6024 tree cstype
= (*signed_type_for
) (ctype
);
6025 if ((t1
= extract_muldiv (op0
, c
, code
, cstype
, strict_overflow_p
))
6028 t1
= fold_build1 (tcode
, cstype
, fold_convert (cstype
, t1
));
6029 return fold_convert (ctype
, t1
);
6033 /* If the constant is negative, we cannot simplify this. */
6034 if (tree_int_cst_sgn (c
) == -1)
6038 /* For division and modulus, type can't be unsigned, as e.g.
6039 (-(x / 2U)) / 2U isn't equal to -((x / 2U) / 2U) for x >= 2.
6040 For signed types, even with wrapping overflow, this is fine. */
6041 if (code
!= MULT_EXPR
&& TYPE_UNSIGNED (type
))
6043 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
, strict_overflow_p
))
6045 return fold_build1 (tcode
, ctype
, fold_convert (ctype
, t1
));
6048 case MIN_EXPR
: case MAX_EXPR
:
6049 /* If widening the type changes the signedness, then we can't perform
6050 this optimization as that changes the result. */
6051 if (TYPE_UNSIGNED (ctype
) != TYPE_UNSIGNED (type
))
6054 /* MIN (a, b) / 5 -> MIN (a / 5, b / 5) */
6055 sub_strict_overflow_p
= false;
6056 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6057 &sub_strict_overflow_p
)) != 0
6058 && (t2
= extract_muldiv (op1
, c
, code
, wide_type
,
6059 &sub_strict_overflow_p
)) != 0)
6061 if (tree_int_cst_sgn (c
) < 0)
6062 tcode
= (tcode
== MIN_EXPR
? MAX_EXPR
: MIN_EXPR
);
6063 if (sub_strict_overflow_p
)
6064 *strict_overflow_p
= true;
6065 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6066 fold_convert (ctype
, t2
));
6070 case LSHIFT_EXPR
: case RSHIFT_EXPR
:
6071 /* If the second operand is constant, this is a multiplication
6072 or floor division, by a power of two, so we can treat it that
6073 way unless the multiplier or divisor overflows. Signed
6074 left-shift overflow is implementation-defined rather than
6075 undefined in C90, so do not convert signed left shift into
6077 if (TREE_CODE (op1
) == INTEGER_CST
6078 && (tcode
== RSHIFT_EXPR
|| TYPE_UNSIGNED (TREE_TYPE (op0
)))
6079 /* const_binop may not detect overflow correctly,
6080 so check for it explicitly here. */
6081 && wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)), op1
)
6082 && 0 != (t1
= fold_convert (ctype
,
6083 const_binop (LSHIFT_EXPR
,
6086 && !TREE_OVERFLOW (t1
))
6087 return extract_muldiv (build2 (tcode
== LSHIFT_EXPR
6088 ? MULT_EXPR
: FLOOR_DIV_EXPR
,
6090 fold_convert (ctype
, op0
),
6092 c
, code
, wide_type
, strict_overflow_p
);
6095 case PLUS_EXPR
: case MINUS_EXPR
:
6096 /* See if we can eliminate the operation on both sides. If we can, we
6097 can return a new PLUS or MINUS. If we can't, the only remaining
6098 cases where we can do anything are if the second operand is a
6100 sub_strict_overflow_p
= false;
6101 t1
= extract_muldiv (op0
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6102 t2
= extract_muldiv (op1
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6103 if (t1
!= 0 && t2
!= 0
6104 && (code
== MULT_EXPR
6105 /* If not multiplication, we can only do this if both operands
6106 are divisible by c. */
6107 || (multiple_of_p (ctype
, op0
, c
)
6108 && multiple_of_p (ctype
, op1
, c
))))
6110 if (sub_strict_overflow_p
)
6111 *strict_overflow_p
= true;
6112 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6113 fold_convert (ctype
, t2
));
6116 /* If this was a subtraction, negate OP1 and set it to be an addition.
6117 This simplifies the logic below. */
6118 if (tcode
== MINUS_EXPR
)
6120 tcode
= PLUS_EXPR
, op1
= negate_expr (op1
);
6121 /* If OP1 was not easily negatable, the constant may be OP0. */
6122 if (TREE_CODE (op0
) == INTEGER_CST
)
6124 std::swap (op0
, op1
);
6129 if (TREE_CODE (op1
) != INTEGER_CST
)
6132 /* If either OP1 or C are negative, this optimization is not safe for
6133 some of the division and remainder types while for others we need
6134 to change the code. */
6135 if (tree_int_cst_sgn (op1
) < 0 || tree_int_cst_sgn (c
) < 0)
6137 if (code
== CEIL_DIV_EXPR
)
6138 code
= FLOOR_DIV_EXPR
;
6139 else if (code
== FLOOR_DIV_EXPR
)
6140 code
= CEIL_DIV_EXPR
;
6141 else if (code
!= MULT_EXPR
6142 && code
!= CEIL_MOD_EXPR
&& code
!= FLOOR_MOD_EXPR
)
6146 /* If it's a multiply or a division/modulus operation of a multiple
6147 of our constant, do the operation and verify it doesn't overflow. */
6148 if (code
== MULT_EXPR
6149 || wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6151 op1
= const_binop (code
, fold_convert (ctype
, op1
),
6152 fold_convert (ctype
, c
));
6153 /* We allow the constant to overflow with wrapping semantics. */
6155 || (TREE_OVERFLOW (op1
) && !TYPE_OVERFLOW_WRAPS (ctype
)))
6161 /* If we have an unsigned type, we cannot widen the operation since it
6162 will change the result if the original computation overflowed. */
6163 if (TYPE_UNSIGNED (ctype
) && ctype
!= type
)
6166 /* If we were able to eliminate our operation from the first side,
6167 apply our operation to the second side and reform the PLUS. */
6168 if (t1
!= 0 && (TREE_CODE (t1
) != code
|| code
== MULT_EXPR
))
6169 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
), op1
);
6171 /* The last case is if we are a multiply. In that case, we can
6172 apply the distributive law to commute the multiply and addition
6173 if the multiplication of the constants doesn't overflow
6174 and overflow is defined. With undefined overflow
6175 op0 * c might overflow, while (op0 + orig_op1) * c doesn't. */
6176 if (code
== MULT_EXPR
&& TYPE_OVERFLOW_WRAPS (ctype
))
6177 return fold_build2 (tcode
, ctype
,
6178 fold_build2 (code
, ctype
,
6179 fold_convert (ctype
, op0
),
6180 fold_convert (ctype
, c
)),
6186 /* We have a special case here if we are doing something like
6187 (C * 8) % 4 since we know that's zero. */
6188 if ((code
== TRUNC_MOD_EXPR
|| code
== CEIL_MOD_EXPR
6189 || code
== FLOOR_MOD_EXPR
|| code
== ROUND_MOD_EXPR
)
6190 /* If the multiplication can overflow we cannot optimize this. */
6191 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (t
))
6192 && TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
6193 && wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6195 *strict_overflow_p
= true;
6196 return omit_one_operand (type
, integer_zero_node
, op0
);
6199 /* ... fall through ... */
6201 case TRUNC_DIV_EXPR
: case CEIL_DIV_EXPR
: case FLOOR_DIV_EXPR
:
6202 case ROUND_DIV_EXPR
: case EXACT_DIV_EXPR
:
6203 /* If we can extract our operation from the LHS, do so and return a
6204 new operation. Likewise for the RHS from a MULT_EXPR. Otherwise,
6205 do something only if the second operand is a constant. */
6207 && (t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6208 strict_overflow_p
)) != 0)
6209 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6210 fold_convert (ctype
, op1
));
6211 else if (tcode
== MULT_EXPR
&& code
== MULT_EXPR
6212 && (t1
= extract_muldiv (op1
, c
, code
, wide_type
,
6213 strict_overflow_p
)) != 0)
6214 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6215 fold_convert (ctype
, t1
));
6216 else if (TREE_CODE (op1
) != INTEGER_CST
)
6219 /* If these are the same operation types, we can associate them
6220 assuming no overflow. */
6223 bool overflow_p
= false;
6224 bool overflow_mul_p
;
6225 signop sign
= TYPE_SIGN (ctype
);
6226 wide_int mul
= wi::mul (op1
, c
, sign
, &overflow_mul_p
);
6227 overflow_p
= TREE_OVERFLOW (c
) | TREE_OVERFLOW (op1
);
6229 && ((sign
== UNSIGNED
&& tcode
!= MULT_EXPR
) || sign
== SIGNED
))
6232 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6233 wide_int_to_tree (ctype
, mul
));
6236 /* If these operations "cancel" each other, we have the main
6237 optimizations of this pass, which occur when either constant is a
6238 multiple of the other, in which case we replace this with either an
6239 operation or CODE or TCODE.
6241 If we have an unsigned type, we cannot do this since it will change
6242 the result if the original computation overflowed. */
6243 if (TYPE_OVERFLOW_UNDEFINED (ctype
)
6244 && ((code
== MULT_EXPR
&& tcode
== EXACT_DIV_EXPR
)
6245 || (tcode
== MULT_EXPR
6246 && code
!= TRUNC_MOD_EXPR
&& code
!= CEIL_MOD_EXPR
6247 && code
!= FLOOR_MOD_EXPR
&& code
!= ROUND_MOD_EXPR
6248 && code
!= MULT_EXPR
)))
6250 if (wi::multiple_of_p (op1
, c
, TYPE_SIGN (type
)))
6252 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6253 *strict_overflow_p
= true;
6254 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6255 fold_convert (ctype
,
6256 const_binop (TRUNC_DIV_EXPR
,
6259 else if (wi::multiple_of_p (c
, op1
, TYPE_SIGN (type
)))
6261 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6262 *strict_overflow_p
= true;
6263 return fold_build2 (code
, ctype
, fold_convert (ctype
, op0
),
6264 fold_convert (ctype
,
6265 const_binop (TRUNC_DIV_EXPR
,
6278 /* Return a node which has the indicated constant VALUE (either 0 or
6279 1 for scalars or {-1,-1,..} or {0,0,...} for vectors),
6280 and is of the indicated TYPE. */
6283 constant_boolean_node (bool value
, tree type
)
6285 if (type
== integer_type_node
)
6286 return value
? integer_one_node
: integer_zero_node
;
6287 else if (type
== boolean_type_node
)
6288 return value
? boolean_true_node
: boolean_false_node
;
6289 else if (TREE_CODE (type
) == VECTOR_TYPE
)
6290 return build_vector_from_val (type
,
6291 build_int_cst (TREE_TYPE (type
),
6294 return fold_convert (type
, value
? integer_one_node
: integer_zero_node
);
6298 /* Transform `a + (b ? x : y)' into `b ? (a + x) : (a + y)'.
6299 Transform, `a + (x < y)' into `(x < y) ? (a + 1) : (a + 0)'. Here
6300 CODE corresponds to the `+', COND to the `(b ? x : y)' or `(x < y)'
6301 expression, and ARG to `a'. If COND_FIRST_P is nonzero, then the
6302 COND is the first argument to CODE; otherwise (as in the example
6303 given here), it is the second argument. TYPE is the type of the
6304 original expression. Return NULL_TREE if no simplification is
6308 fold_binary_op_with_conditional_arg (location_t loc
,
6309 enum tree_code code
,
6310 tree type
, tree op0
, tree op1
,
6311 tree cond
, tree arg
, int cond_first_p
)
6313 tree cond_type
= cond_first_p
? TREE_TYPE (op0
) : TREE_TYPE (op1
);
6314 tree arg_type
= cond_first_p
? TREE_TYPE (op1
) : TREE_TYPE (op0
);
6315 tree test
, true_value
, false_value
;
6316 tree lhs
= NULL_TREE
;
6317 tree rhs
= NULL_TREE
;
6318 enum tree_code cond_code
= COND_EXPR
;
6320 if (TREE_CODE (cond
) == COND_EXPR
6321 || TREE_CODE (cond
) == VEC_COND_EXPR
)
6323 test
= TREE_OPERAND (cond
, 0);
6324 true_value
= TREE_OPERAND (cond
, 1);
6325 false_value
= TREE_OPERAND (cond
, 2);
6326 /* If this operand throws an expression, then it does not make
6327 sense to try to perform a logical or arithmetic operation
6329 if (VOID_TYPE_P (TREE_TYPE (true_value
)))
6331 if (VOID_TYPE_P (TREE_TYPE (false_value
)))
6336 tree testtype
= TREE_TYPE (cond
);
6338 true_value
= constant_boolean_node (true, testtype
);
6339 false_value
= constant_boolean_node (false, testtype
);
6342 if (TREE_CODE (TREE_TYPE (test
)) == VECTOR_TYPE
)
6343 cond_code
= VEC_COND_EXPR
;
6345 /* This transformation is only worthwhile if we don't have to wrap ARG
6346 in a SAVE_EXPR and the operation can be simplified without recursing
6347 on at least one of the branches once its pushed inside the COND_EXPR. */
6348 if (!TREE_CONSTANT (arg
)
6349 && (TREE_SIDE_EFFECTS (arg
)
6350 || TREE_CODE (arg
) == COND_EXPR
|| TREE_CODE (arg
) == VEC_COND_EXPR
6351 || TREE_CONSTANT (true_value
) || TREE_CONSTANT (false_value
)))
6354 arg
= fold_convert_loc (loc
, arg_type
, arg
);
6357 true_value
= fold_convert_loc (loc
, cond_type
, true_value
);
6359 lhs
= fold_build2_loc (loc
, code
, type
, true_value
, arg
);
6361 lhs
= fold_build2_loc (loc
, code
, type
, arg
, true_value
);
6365 false_value
= fold_convert_loc (loc
, cond_type
, false_value
);
6367 rhs
= fold_build2_loc (loc
, code
, type
, false_value
, arg
);
6369 rhs
= fold_build2_loc (loc
, code
, type
, arg
, false_value
);
6372 /* Check that we have simplified at least one of the branches. */
6373 if (!TREE_CONSTANT (arg
) && !TREE_CONSTANT (lhs
) && !TREE_CONSTANT (rhs
))
6376 return fold_build3_loc (loc
, cond_code
, type
, test
, lhs
, rhs
);
6380 /* Subroutine of fold() that checks for the addition of +/- 0.0.
6382 If !NEGATE, return true if ADDEND is +/-0.0 and, for all X of type
6383 TYPE, X + ADDEND is the same as X. If NEGATE, return true if X -
6384 ADDEND is the same as X.
6386 X + 0 and X - 0 both give X when X is NaN, infinite, or nonzero
6387 and finite. The problematic cases are when X is zero, and its mode
6388 has signed zeros. In the case of rounding towards -infinity,
6389 X - 0 is not the same as X because 0 - 0 is -0. In other rounding
6390 modes, X + 0 is not the same as X because -0 + 0 is 0. */
6393 fold_real_zero_addition_p (const_tree type
, const_tree addend
, int negate
)
6395 if (!real_zerop (addend
))
6398 /* Don't allow the fold with -fsignaling-nans. */
6399 if (HONOR_SNANS (element_mode (type
)))
6402 /* Allow the fold if zeros aren't signed, or their sign isn't important. */
6403 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
6406 /* In a vector or complex, we would need to check the sign of all zeros. */
6407 if (TREE_CODE (addend
) != REAL_CST
)
6410 /* Treat x + -0 as x - 0 and x - -0 as x + 0. */
6411 if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (addend
)))
6414 /* The mode has signed zeros, and we have to honor their sign.
6415 In this situation, there is only one case we can return true for.
6416 X - 0 is the same as X unless rounding towards -infinity is
6418 return negate
&& !HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
));
6421 /* Subroutine of fold() that checks comparisons of built-in math
6422 functions against real constants.
6424 FCODE is the DECL_FUNCTION_CODE of the built-in, CODE is the comparison
6425 operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR, GE_EXPR or LE_EXPR. TYPE
6426 is the type of the result and ARG0 and ARG1 are the operands of the
6427 comparison. ARG1 must be a TREE_REAL_CST.
6429 The function returns the constant folded tree if a simplification
6430 can be made, and NULL_TREE otherwise. */
6433 fold_mathfn_compare (location_t loc
,
6434 enum built_in_function fcode
, enum tree_code code
,
6435 tree type
, tree arg0
, tree arg1
)
6439 if (BUILTIN_SQRT_P (fcode
))
6441 tree arg
= CALL_EXPR_ARG (arg0
, 0);
6442 machine_mode mode
= TYPE_MODE (TREE_TYPE (arg0
));
6444 c
= TREE_REAL_CST (arg1
);
6445 if (REAL_VALUE_NEGATIVE (c
))
6447 /* sqrt(x) < y is always false, if y is negative. */
6448 if (code
== EQ_EXPR
|| code
== LT_EXPR
|| code
== LE_EXPR
)
6449 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg
);
6451 /* sqrt(x) > y is always true, if y is negative and we
6452 don't care about NaNs, i.e. negative values of x. */
6453 if (code
== NE_EXPR
|| !HONOR_NANS (mode
))
6454 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg
);
6456 /* sqrt(x) > y is the same as x >= 0, if y is negative. */
6457 return fold_build2_loc (loc
, GE_EXPR
, type
, arg
,
6458 build_real (TREE_TYPE (arg
), dconst0
));
6460 else if (code
== GT_EXPR
|| code
== GE_EXPR
)
6464 REAL_ARITHMETIC (c2
, MULT_EXPR
, c
, c
);
6465 real_convert (&c2
, mode
, &c2
);
6467 if (REAL_VALUE_ISINF (c2
))
6469 /* sqrt(x) > y is x == +Inf, when y is very large. */
6470 if (HONOR_INFINITIES (mode
))
6471 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg
,
6472 build_real (TREE_TYPE (arg
), c2
));
6474 /* sqrt(x) > y is always false, when y is very large
6475 and we don't care about infinities. */
6476 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg
);
6479 /* sqrt(x) > c is the same as x > c*c. */
6480 return fold_build2_loc (loc
, code
, type
, arg
,
6481 build_real (TREE_TYPE (arg
), c2
));
6483 else if (code
== LT_EXPR
|| code
== LE_EXPR
)
6487 REAL_ARITHMETIC (c2
, MULT_EXPR
, c
, c
);
6488 real_convert (&c2
, mode
, &c2
);
6490 if (REAL_VALUE_ISINF (c2
))
6492 /* sqrt(x) < y is always true, when y is a very large
6493 value and we don't care about NaNs or Infinities. */
6494 if (! HONOR_NANS (mode
) && ! HONOR_INFINITIES (mode
))
6495 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg
);
6497 /* sqrt(x) < y is x != +Inf when y is very large and we
6498 don't care about NaNs. */
6499 if (! HONOR_NANS (mode
))
6500 return fold_build2_loc (loc
, NE_EXPR
, type
, arg
,
6501 build_real (TREE_TYPE (arg
), c2
));
6503 /* sqrt(x) < y is x >= 0 when y is very large and we
6504 don't care about Infinities. */
6505 if (! HONOR_INFINITIES (mode
))
6506 return fold_build2_loc (loc
, GE_EXPR
, type
, arg
,
6507 build_real (TREE_TYPE (arg
), dconst0
));
6509 /* sqrt(x) < y is x >= 0 && x != +Inf, when y is large. */
6510 arg
= save_expr (arg
);
6511 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
6512 fold_build2_loc (loc
, GE_EXPR
, type
, arg
,
6513 build_real (TREE_TYPE (arg
),
6515 fold_build2_loc (loc
, NE_EXPR
, type
, arg
,
6516 build_real (TREE_TYPE (arg
),
6520 /* sqrt(x) < c is the same as x < c*c, if we ignore NaNs. */
6521 if (! HONOR_NANS (mode
))
6522 return fold_build2_loc (loc
, code
, type
, arg
,
6523 build_real (TREE_TYPE (arg
), c2
));
6525 /* sqrt(x) < c is the same as x >= 0 && x < c*c. */
6526 arg
= save_expr (arg
);
6527 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
6528 fold_build2_loc (loc
, GE_EXPR
, type
, arg
,
6529 build_real (TREE_TYPE (arg
),
6531 fold_build2_loc (loc
, code
, type
, arg
,
6532 build_real (TREE_TYPE (arg
),
6540 /* Subroutine of fold() that optimizes comparisons against Infinities,
6541 either +Inf or -Inf.
6543 CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
6544 GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1
6545 are the operands of the comparison. ARG1 must be a TREE_REAL_CST.
6547 The function returns the constant folded tree if a simplification
6548 can be made, and NULL_TREE otherwise. */
6551 fold_inf_compare (location_t loc
, enum tree_code code
, tree type
,
6552 tree arg0
, tree arg1
)
6555 REAL_VALUE_TYPE max
;
6559 mode
= TYPE_MODE (TREE_TYPE (arg0
));
6561 /* For negative infinity swap the sense of the comparison. */
6562 neg
= REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1
));
6564 code
= swap_tree_comparison (code
);
6569 /* x > +Inf is always false, if with ignore sNANs. */
6570 if (HONOR_SNANS (mode
))
6572 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
6575 /* x <= +Inf is always true, if we don't case about NaNs. */
6576 if (! HONOR_NANS (mode
))
6577 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
6579 /* x <= +Inf is the same as x == x, i.e. isfinite(x). */
6580 arg0
= save_expr (arg0
);
6581 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg0
, arg0
);
6585 /* x == +Inf and x >= +Inf are always equal to x > DBL_MAX. */
6586 real_maxval (&max
, neg
, mode
);
6587 return fold_build2_loc (loc
, neg
? LT_EXPR
: GT_EXPR
, type
,
6588 arg0
, build_real (TREE_TYPE (arg0
), max
));
6591 /* x < +Inf is always equal to x <= DBL_MAX. */
6592 real_maxval (&max
, neg
, mode
);
6593 return fold_build2_loc (loc
, neg
? GE_EXPR
: LE_EXPR
, type
,
6594 arg0
, build_real (TREE_TYPE (arg0
), max
));
6597 /* x != +Inf is always equal to !(x > DBL_MAX). */
6598 real_maxval (&max
, neg
, mode
);
6599 if (! HONOR_NANS (mode
))
6600 return fold_build2_loc (loc
, neg
? GE_EXPR
: LE_EXPR
, type
,
6601 arg0
, build_real (TREE_TYPE (arg0
), max
));
6603 temp
= fold_build2_loc (loc
, neg
? LT_EXPR
: GT_EXPR
, type
,
6604 arg0
, build_real (TREE_TYPE (arg0
), max
));
6605 return fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, temp
);
6614 /* Subroutine of fold() that optimizes comparisons of a division by
6615 a nonzero integer constant against an integer constant, i.e.
6618 CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
6619 GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1
6620 are the operands of the comparison. ARG1 must be a TREE_REAL_CST.
6622 The function returns the constant folded tree if a simplification
6623 can be made, and NULL_TREE otherwise. */
6626 fold_div_compare (location_t loc
,
6627 enum tree_code code
, tree type
, tree arg0
, tree arg1
)
6629 tree prod
, tmp
, hi
, lo
;
6630 tree arg00
= TREE_OPERAND (arg0
, 0);
6631 tree arg01
= TREE_OPERAND (arg0
, 1);
6632 signop sign
= TYPE_SIGN (TREE_TYPE (arg0
));
6633 bool neg_overflow
= false;
6636 /* We have to do this the hard way to detect unsigned overflow.
6637 prod = int_const_binop (MULT_EXPR, arg01, arg1); */
6638 wide_int val
= wi::mul (arg01
, arg1
, sign
, &overflow
);
6639 prod
= force_fit_type (TREE_TYPE (arg00
), val
, -1, overflow
);
6640 neg_overflow
= false;
6642 if (sign
== UNSIGNED
)
6644 tmp
= int_const_binop (MINUS_EXPR
, arg01
,
6645 build_int_cst (TREE_TYPE (arg01
), 1));
6648 /* Likewise hi = int_const_binop (PLUS_EXPR, prod, tmp). */
6649 val
= wi::add (prod
, tmp
, sign
, &overflow
);
6650 hi
= force_fit_type (TREE_TYPE (arg00
), val
,
6651 -1, overflow
| TREE_OVERFLOW (prod
));
6653 else if (tree_int_cst_sgn (arg01
) >= 0)
6655 tmp
= int_const_binop (MINUS_EXPR
, arg01
,
6656 build_int_cst (TREE_TYPE (arg01
), 1));
6657 switch (tree_int_cst_sgn (arg1
))
6660 neg_overflow
= true;
6661 lo
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
6666 lo
= fold_negate_const (tmp
, TREE_TYPE (arg0
));
6671 hi
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
6681 /* A negative divisor reverses the relational operators. */
6682 code
= swap_tree_comparison (code
);
6684 tmp
= int_const_binop (PLUS_EXPR
, arg01
,
6685 build_int_cst (TREE_TYPE (arg01
), 1));
6686 switch (tree_int_cst_sgn (arg1
))
6689 hi
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
6694 hi
= fold_negate_const (tmp
, TREE_TYPE (arg0
));
6699 neg_overflow
= true;
6700 lo
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
6712 if (TREE_OVERFLOW (lo
) && TREE_OVERFLOW (hi
))
6713 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg00
);
6714 if (TREE_OVERFLOW (hi
))
6715 return fold_build2_loc (loc
, GE_EXPR
, type
, arg00
, lo
);
6716 if (TREE_OVERFLOW (lo
))
6717 return fold_build2_loc (loc
, LE_EXPR
, type
, arg00
, hi
);
6718 return build_range_check (loc
, type
, arg00
, 1, lo
, hi
);
6721 if (TREE_OVERFLOW (lo
) && TREE_OVERFLOW (hi
))
6722 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg00
);
6723 if (TREE_OVERFLOW (hi
))
6724 return fold_build2_loc (loc
, LT_EXPR
, type
, arg00
, lo
);
6725 if (TREE_OVERFLOW (lo
))
6726 return fold_build2_loc (loc
, GT_EXPR
, type
, arg00
, hi
);
6727 return build_range_check (loc
, type
, arg00
, 0, lo
, hi
);
6730 if (TREE_OVERFLOW (lo
))
6732 tmp
= neg_overflow
? integer_zero_node
: integer_one_node
;
6733 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6735 return fold_build2_loc (loc
, LT_EXPR
, type
, arg00
, lo
);
6738 if (TREE_OVERFLOW (hi
))
6740 tmp
= neg_overflow
? integer_zero_node
: integer_one_node
;
6741 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6743 return fold_build2_loc (loc
, LE_EXPR
, type
, arg00
, hi
);
6746 if (TREE_OVERFLOW (hi
))
6748 tmp
= neg_overflow
? integer_one_node
: integer_zero_node
;
6749 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6751 return fold_build2_loc (loc
, GT_EXPR
, type
, arg00
, hi
);
6754 if (TREE_OVERFLOW (lo
))
6756 tmp
= neg_overflow
? integer_one_node
: integer_zero_node
;
6757 return omit_one_operand_loc (loc
, type
, tmp
, arg00
);
6759 return fold_build2_loc (loc
, GE_EXPR
, type
, arg00
, lo
);
6769 /* If CODE with arguments ARG0 and ARG1 represents a single bit
6770 equality/inequality test, then return a simplified form of the test
6771 using a sign testing. Otherwise return NULL. TYPE is the desired
6775 fold_single_bit_test_into_sign_test (location_t loc
,
6776 enum tree_code code
, tree arg0
, tree arg1
,
6779 /* If this is testing a single bit, we can optimize the test. */
6780 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
6781 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
6782 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
6784 /* If we have (A & C) != 0 where C is the sign bit of A, convert
6785 this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
6786 tree arg00
= sign_bit_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg0
, 1));
6788 if (arg00
!= NULL_TREE
6789 /* This is only a win if casting to a signed type is cheap,
6790 i.e. when arg00's type is not a partial mode. */
6791 && TYPE_PRECISION (TREE_TYPE (arg00
))
6792 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (arg00
))))
6794 tree stype
= signed_type_for (TREE_TYPE (arg00
));
6795 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
6797 fold_convert_loc (loc
, stype
, arg00
),
6798 build_int_cst (stype
, 0));
6805 /* If CODE with arguments ARG0 and ARG1 represents a single bit
6806 equality/inequality test, then return a simplified form of
6807 the test using shifts and logical operations. Otherwise return
6808 NULL. TYPE is the desired result type. */
6811 fold_single_bit_test (location_t loc
, enum tree_code code
,
6812 tree arg0
, tree arg1
, tree result_type
)
6814 /* If this is testing a single bit, we can optimize the test. */
6815 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
6816 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
6817 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
6819 tree inner
= TREE_OPERAND (arg0
, 0);
6820 tree type
= TREE_TYPE (arg0
);
6821 int bitnum
= tree_log2 (TREE_OPERAND (arg0
, 1));
6822 machine_mode operand_mode
= TYPE_MODE (type
);
6824 tree signed_type
, unsigned_type
, intermediate_type
;
6827 /* First, see if we can fold the single bit test into a sign-bit
6829 tem
= fold_single_bit_test_into_sign_test (loc
, code
, arg0
, arg1
,
6834 /* Otherwise we have (A & C) != 0 where C is a single bit,
6835 convert that into ((A >> C2) & 1). Where C2 = log2(C).
6836 Similarly for (A & C) == 0. */
6838 /* If INNER is a right shift of a constant and it plus BITNUM does
6839 not overflow, adjust BITNUM and INNER. */
6840 if (TREE_CODE (inner
) == RSHIFT_EXPR
6841 && TREE_CODE (TREE_OPERAND (inner
, 1)) == INTEGER_CST
6842 && bitnum
< TYPE_PRECISION (type
)
6843 && wi::ltu_p (TREE_OPERAND (inner
, 1),
6844 TYPE_PRECISION (type
) - bitnum
))
6846 bitnum
+= tree_to_uhwi (TREE_OPERAND (inner
, 1));
6847 inner
= TREE_OPERAND (inner
, 0);
6850 /* If we are going to be able to omit the AND below, we must do our
6851 operations as unsigned. If we must use the AND, we have a choice.
6852 Normally unsigned is faster, but for some machines signed is. */
6853 #ifdef LOAD_EXTEND_OP
6854 ops_unsigned
= (LOAD_EXTEND_OP (operand_mode
) == SIGN_EXTEND
6855 && !flag_syntax_only
) ? 0 : 1;
6860 signed_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 0);
6861 unsigned_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 1);
6862 intermediate_type
= ops_unsigned
? unsigned_type
: signed_type
;
6863 inner
= fold_convert_loc (loc
, intermediate_type
, inner
);
6866 inner
= build2 (RSHIFT_EXPR
, intermediate_type
,
6867 inner
, size_int (bitnum
));
6869 one
= build_int_cst (intermediate_type
, 1);
6871 if (code
== EQ_EXPR
)
6872 inner
= fold_build2_loc (loc
, BIT_XOR_EXPR
, intermediate_type
, inner
, one
);
6874 /* Put the AND last so it can combine with more things. */
6875 inner
= build2 (BIT_AND_EXPR
, intermediate_type
, inner
, one
);
6877 /* Make sure to return the proper type. */
6878 inner
= fold_convert_loc (loc
, result_type
, inner
);
6885 /* Check whether we are allowed to reorder operands arg0 and arg1,
6886 such that the evaluation of arg1 occurs before arg0. */
6889 reorder_operands_p (const_tree arg0
, const_tree arg1
)
6891 if (! flag_evaluation_order
)
6893 if (TREE_CONSTANT (arg0
) || TREE_CONSTANT (arg1
))
6895 return ! TREE_SIDE_EFFECTS (arg0
)
6896 && ! TREE_SIDE_EFFECTS (arg1
);
6899 /* Test whether it is preferable two swap two operands, ARG0 and
6900 ARG1, for example because ARG0 is an integer constant and ARG1
6901 isn't. If REORDER is true, only recommend swapping if we can
6902 evaluate the operands in reverse order. */
6905 tree_swap_operands_p (const_tree arg0
, const_tree arg1
, bool reorder
)
6907 if (CONSTANT_CLASS_P (arg1
))
6909 if (CONSTANT_CLASS_P (arg0
))
6915 if (TREE_CONSTANT (arg1
))
6917 if (TREE_CONSTANT (arg0
))
6920 if (reorder
&& flag_evaluation_order
6921 && (TREE_SIDE_EFFECTS (arg0
) || TREE_SIDE_EFFECTS (arg1
)))
6924 /* It is preferable to swap two SSA_NAME to ensure a canonical form
6925 for commutative and comparison operators. Ensuring a canonical
6926 form allows the optimizers to find additional redundancies without
6927 having to explicitly check for both orderings. */
6928 if (TREE_CODE (arg0
) == SSA_NAME
6929 && TREE_CODE (arg1
) == SSA_NAME
6930 && SSA_NAME_VERSION (arg0
) > SSA_NAME_VERSION (arg1
))
6933 /* Put SSA_NAMEs last. */
6934 if (TREE_CODE (arg1
) == SSA_NAME
)
6936 if (TREE_CODE (arg0
) == SSA_NAME
)
6939 /* Put variables last. */
6948 /* Fold comparison ARG0 CODE ARG1 (with result in TYPE), where
6949 ARG0 is extended to a wider type. */
6952 fold_widened_comparison (location_t loc
, enum tree_code code
,
6953 tree type
, tree arg0
, tree arg1
)
6955 tree arg0_unw
= get_unwidened (arg0
, NULL_TREE
);
6957 tree shorter_type
, outer_type
;
6961 if (arg0_unw
== arg0
)
6963 shorter_type
= TREE_TYPE (arg0_unw
);
6965 /* Disable this optimization if we're casting a function pointer
6966 type on targets that require function pointer canonicalization. */
6967 if (targetm
.have_canonicalize_funcptr_for_compare ()
6968 && TREE_CODE (shorter_type
) == POINTER_TYPE
6969 && TREE_CODE (TREE_TYPE (shorter_type
)) == FUNCTION_TYPE
)
6972 if (TYPE_PRECISION (TREE_TYPE (arg0
)) <= TYPE_PRECISION (shorter_type
))
6975 arg1_unw
= get_unwidened (arg1
, NULL_TREE
);
6977 /* If possible, express the comparison in the shorter mode. */
6978 if ((code
== EQ_EXPR
|| code
== NE_EXPR
6979 || TYPE_UNSIGNED (TREE_TYPE (arg0
)) == TYPE_UNSIGNED (shorter_type
))
6980 && (TREE_TYPE (arg1_unw
) == shorter_type
6981 || ((TYPE_PRECISION (shorter_type
)
6982 >= TYPE_PRECISION (TREE_TYPE (arg1_unw
)))
6983 && (TYPE_UNSIGNED (shorter_type
)
6984 == TYPE_UNSIGNED (TREE_TYPE (arg1_unw
))))
6985 || (TREE_CODE (arg1_unw
) == INTEGER_CST
6986 && (TREE_CODE (shorter_type
) == INTEGER_TYPE
6987 || TREE_CODE (shorter_type
) == BOOLEAN_TYPE
)
6988 && int_fits_type_p (arg1_unw
, shorter_type
))))
6989 return fold_build2_loc (loc
, code
, type
, arg0_unw
,
6990 fold_convert_loc (loc
, shorter_type
, arg1_unw
));
6992 if (TREE_CODE (arg1_unw
) != INTEGER_CST
6993 || TREE_CODE (shorter_type
) != INTEGER_TYPE
6994 || !int_fits_type_p (arg1_unw
, shorter_type
))
6997 /* If we are comparing with the integer that does not fit into the range
6998 of the shorter type, the result is known. */
6999 outer_type
= TREE_TYPE (arg1_unw
);
7000 min
= lower_bound_in_type (outer_type
, shorter_type
);
7001 max
= upper_bound_in_type (outer_type
, shorter_type
);
7003 above
= integer_nonzerop (fold_relational_const (LT_EXPR
, type
,
7005 below
= integer_nonzerop (fold_relational_const (LT_EXPR
, type
,
7012 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
7017 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
7023 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
7025 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
7030 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
7032 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
7041 /* Fold comparison ARG0 CODE ARG1 (with result in TYPE), where for
7042 ARG0 just the signedness is changed. */
7045 fold_sign_changed_comparison (location_t loc
, enum tree_code code
, tree type
,
7046 tree arg0
, tree arg1
)
7049 tree inner_type
, outer_type
;
7051 if (!CONVERT_EXPR_P (arg0
))
7054 outer_type
= TREE_TYPE (arg0
);
7055 arg0_inner
= TREE_OPERAND (arg0
, 0);
7056 inner_type
= TREE_TYPE (arg0_inner
);
7058 /* Disable this optimization if we're casting a function pointer
7059 type on targets that require function pointer canonicalization. */
7060 if (targetm
.have_canonicalize_funcptr_for_compare ()
7061 && TREE_CODE (inner_type
) == POINTER_TYPE
7062 && TREE_CODE (TREE_TYPE (inner_type
)) == FUNCTION_TYPE
)
7065 if (TYPE_PRECISION (inner_type
) != TYPE_PRECISION (outer_type
))
7068 if (TREE_CODE (arg1
) != INTEGER_CST
7069 && !(CONVERT_EXPR_P (arg1
)
7070 && TREE_TYPE (TREE_OPERAND (arg1
, 0)) == inner_type
))
7073 if (TYPE_UNSIGNED (inner_type
) != TYPE_UNSIGNED (outer_type
)
7078 if (POINTER_TYPE_P (inner_type
) != POINTER_TYPE_P (outer_type
))
7081 if (TREE_CODE (arg1
) == INTEGER_CST
)
7082 arg1
= force_fit_type (inner_type
, wi::to_widest (arg1
), 0,
7083 TREE_OVERFLOW (arg1
));
7085 arg1
= fold_convert_loc (loc
, inner_type
, arg1
);
7087 return fold_build2_loc (loc
, code
, type
, arg0_inner
, arg1
);
7091 /* Fold A < X && A + 1 > Y to A < X && A >= Y. Normally A + 1 > Y
7092 means A >= Y && A != MAX, but in this case we know that
7093 A < X <= MAX. INEQ is A + 1 > Y, BOUND is A < X. */
7096 fold_to_nonsharp_ineq_using_bound (location_t loc
, tree ineq
, tree bound
)
7098 tree a
, typea
, type
= TREE_TYPE (ineq
), a1
, diff
, y
;
7100 if (TREE_CODE (bound
) == LT_EXPR
)
7101 a
= TREE_OPERAND (bound
, 0);
7102 else if (TREE_CODE (bound
) == GT_EXPR
)
7103 a
= TREE_OPERAND (bound
, 1);
7107 typea
= TREE_TYPE (a
);
7108 if (!INTEGRAL_TYPE_P (typea
)
7109 && !POINTER_TYPE_P (typea
))
7112 if (TREE_CODE (ineq
) == LT_EXPR
)
7114 a1
= TREE_OPERAND (ineq
, 1);
7115 y
= TREE_OPERAND (ineq
, 0);
7117 else if (TREE_CODE (ineq
) == GT_EXPR
)
7119 a1
= TREE_OPERAND (ineq
, 0);
7120 y
= TREE_OPERAND (ineq
, 1);
7125 if (TREE_TYPE (a1
) != typea
)
7128 if (POINTER_TYPE_P (typea
))
7130 /* Convert the pointer types into integer before taking the difference. */
7131 tree ta
= fold_convert_loc (loc
, ssizetype
, a
);
7132 tree ta1
= fold_convert_loc (loc
, ssizetype
, a1
);
7133 diff
= fold_binary_loc (loc
, MINUS_EXPR
, ssizetype
, ta1
, ta
);
7136 diff
= fold_binary_loc (loc
, MINUS_EXPR
, typea
, a1
, a
);
7138 if (!diff
|| !integer_onep (diff
))
7141 return fold_build2_loc (loc
, GE_EXPR
, type
, a
, y
);
7144 /* Fold a sum or difference of at least one multiplication.
7145 Returns the folded tree or NULL if no simplification could be made. */
7148 fold_plusminus_mult_expr (location_t loc
, enum tree_code code
, tree type
,
7149 tree arg0
, tree arg1
)
7151 tree arg00
, arg01
, arg10
, arg11
;
7152 tree alt0
= NULL_TREE
, alt1
= NULL_TREE
, same
;
7154 /* (A * C) +- (B * C) -> (A+-B) * C.
7155 (A * C) +- A -> A * (C+-1).
7156 We are most concerned about the case where C is a constant,
7157 but other combinations show up during loop reduction. Since
7158 it is not difficult, try all four possibilities. */
7160 if (TREE_CODE (arg0
) == MULT_EXPR
)
7162 arg00
= TREE_OPERAND (arg0
, 0);
7163 arg01
= TREE_OPERAND (arg0
, 1);
7165 else if (TREE_CODE (arg0
) == INTEGER_CST
)
7167 arg00
= build_one_cst (type
);
7172 /* We cannot generate constant 1 for fract. */
7173 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7176 arg01
= build_one_cst (type
);
7178 if (TREE_CODE (arg1
) == MULT_EXPR
)
7180 arg10
= TREE_OPERAND (arg1
, 0);
7181 arg11
= TREE_OPERAND (arg1
, 1);
7183 else if (TREE_CODE (arg1
) == INTEGER_CST
)
7185 arg10
= build_one_cst (type
);
7186 /* As we canonicalize A - 2 to A + -2 get rid of that sign for
7187 the purpose of this canonicalization. */
7188 if (wi::neg_p (arg1
, TYPE_SIGN (TREE_TYPE (arg1
)))
7189 && negate_expr_p (arg1
)
7190 && code
== PLUS_EXPR
)
7192 arg11
= negate_expr (arg1
);
7200 /* We cannot generate constant 1 for fract. */
7201 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7204 arg11
= build_one_cst (type
);
7208 if (operand_equal_p (arg01
, arg11
, 0))
7209 same
= arg01
, alt0
= arg00
, alt1
= arg10
;
7210 else if (operand_equal_p (arg00
, arg10
, 0))
7211 same
= arg00
, alt0
= arg01
, alt1
= arg11
;
7212 else if (operand_equal_p (arg00
, arg11
, 0))
7213 same
= arg00
, alt0
= arg01
, alt1
= arg10
;
7214 else if (operand_equal_p (arg01
, arg10
, 0))
7215 same
= arg01
, alt0
= arg00
, alt1
= arg11
;
7217 /* No identical multiplicands; see if we can find a common
7218 power-of-two factor in non-power-of-two multiplies. This
7219 can help in multi-dimensional array access. */
7220 else if (tree_fits_shwi_p (arg01
)
7221 && tree_fits_shwi_p (arg11
))
7223 HOST_WIDE_INT int01
, int11
, tmp
;
7226 int01
= tree_to_shwi (arg01
);
7227 int11
= tree_to_shwi (arg11
);
7229 /* Move min of absolute values to int11. */
7230 if (absu_hwi (int01
) < absu_hwi (int11
))
7232 tmp
= int01
, int01
= int11
, int11
= tmp
;
7233 alt0
= arg00
, arg00
= arg10
, arg10
= alt0
;
7240 if (exact_log2 (absu_hwi (int11
)) > 0 && int01
% int11
== 0
7241 /* The remainder should not be a constant, otherwise we
7242 end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has
7243 increased the number of multiplications necessary. */
7244 && TREE_CODE (arg10
) != INTEGER_CST
)
7246 alt0
= fold_build2_loc (loc
, MULT_EXPR
, TREE_TYPE (arg00
), arg00
,
7247 build_int_cst (TREE_TYPE (arg00
),
7252 maybe_same
= alt0
, alt0
= alt1
, alt1
= maybe_same
;
7257 return fold_build2_loc (loc
, MULT_EXPR
, type
,
7258 fold_build2_loc (loc
, code
, type
,
7259 fold_convert_loc (loc
, type
, alt0
),
7260 fold_convert_loc (loc
, type
, alt1
)),
7261 fold_convert_loc (loc
, type
, same
));
7266 /* Subroutine of native_encode_expr. Encode the INTEGER_CST
7267 specified by EXPR into the buffer PTR of length LEN bytes.
7268 Return the number of bytes placed in the buffer, or zero
7272 native_encode_int (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7274 tree type
= TREE_TYPE (expr
);
7275 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7276 int byte
, offset
, word
, words
;
7277 unsigned char value
;
7279 if ((off
== -1 && total_bytes
> len
)
7280 || off
>= total_bytes
)
7284 words
= total_bytes
/ UNITS_PER_WORD
;
7286 for (byte
= 0; byte
< total_bytes
; byte
++)
7288 int bitpos
= byte
* BITS_PER_UNIT
;
7289 /* Extend EXPR according to TYPE_SIGN if the precision isn't a whole
7291 value
= wi::extract_uhwi (wi::to_widest (expr
), bitpos
, BITS_PER_UNIT
);
7293 if (total_bytes
> UNITS_PER_WORD
)
7295 word
= byte
/ UNITS_PER_WORD
;
7296 if (WORDS_BIG_ENDIAN
)
7297 word
= (words
- 1) - word
;
7298 offset
= word
* UNITS_PER_WORD
;
7299 if (BYTES_BIG_ENDIAN
)
7300 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7302 offset
+= byte
% UNITS_PER_WORD
;
7305 offset
= BYTES_BIG_ENDIAN
? (total_bytes
- 1) - byte
: byte
;
7307 && offset
- off
< len
)
7308 ptr
[offset
- off
] = value
;
7310 return MIN (len
, total_bytes
- off
);
7314 /* Subroutine of native_encode_expr. Encode the FIXED_CST
7315 specified by EXPR into the buffer PTR of length LEN bytes.
7316 Return the number of bytes placed in the buffer, or zero
7320 native_encode_fixed (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7322 tree type
= TREE_TYPE (expr
);
7323 machine_mode mode
= TYPE_MODE (type
);
7324 int total_bytes
= GET_MODE_SIZE (mode
);
7325 FIXED_VALUE_TYPE value
;
7326 tree i_value
, i_type
;
7328 if (total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7331 i_type
= lang_hooks
.types
.type_for_size (GET_MODE_BITSIZE (mode
), 1);
7333 if (NULL_TREE
== i_type
7334 || TYPE_PRECISION (i_type
) != total_bytes
)
7337 value
= TREE_FIXED_CST (expr
);
7338 i_value
= double_int_to_tree (i_type
, value
.data
);
7340 return native_encode_int (i_value
, ptr
, len
, off
);
7344 /* Subroutine of native_encode_expr. Encode the REAL_CST
7345 specified by EXPR into the buffer PTR of length LEN bytes.
7346 Return the number of bytes placed in the buffer, or zero
7350 native_encode_real (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7352 tree type
= TREE_TYPE (expr
);
7353 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7354 int byte
, offset
, word
, words
, bitpos
;
7355 unsigned char value
;
7357 /* There are always 32 bits in each long, no matter the size of
7358 the hosts long. We handle floating point representations with
7362 if ((off
== -1 && total_bytes
> len
)
7363 || off
>= total_bytes
)
7367 words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7369 real_to_target (tmp
, TREE_REAL_CST_PTR (expr
), TYPE_MODE (type
));
7371 for (bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7372 bitpos
+= BITS_PER_UNIT
)
7374 byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7375 value
= (unsigned char) (tmp
[bitpos
/ 32] >> (bitpos
& 31));
7377 if (UNITS_PER_WORD
< 4)
7379 word
= byte
/ UNITS_PER_WORD
;
7380 if (WORDS_BIG_ENDIAN
)
7381 word
= (words
- 1) - word
;
7382 offset
= word
* UNITS_PER_WORD
;
7383 if (BYTES_BIG_ENDIAN
)
7384 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7386 offset
+= byte
% UNITS_PER_WORD
;
7389 offset
= BYTES_BIG_ENDIAN
? 3 - byte
: byte
;
7390 offset
= offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3);
7392 && offset
- off
< len
)
7393 ptr
[offset
- off
] = value
;
7395 return MIN (len
, total_bytes
- off
);
7398 /* Subroutine of native_encode_expr. Encode the COMPLEX_CST
7399 specified by EXPR into the buffer PTR of length LEN bytes.
7400 Return the number of bytes placed in the buffer, or zero
7404 native_encode_complex (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7409 part
= TREE_REALPART (expr
);
7410 rsize
= native_encode_expr (part
, ptr
, len
, off
);
7414 part
= TREE_IMAGPART (expr
);
7416 off
= MAX (0, off
- GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (part
))));
7417 isize
= native_encode_expr (part
, ptr
+rsize
, len
-rsize
, off
);
7421 return rsize
+ isize
;
7425 /* Subroutine of native_encode_expr. Encode the VECTOR_CST
7426 specified by EXPR into the buffer PTR of length LEN bytes.
7427 Return the number of bytes placed in the buffer, or zero
7431 native_encode_vector (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7438 count
= VECTOR_CST_NELTS (expr
);
7439 itype
= TREE_TYPE (TREE_TYPE (expr
));
7440 size
= GET_MODE_SIZE (TYPE_MODE (itype
));
7441 for (i
= 0; i
< count
; i
++)
7448 elem
= VECTOR_CST_ELT (expr
, i
);
7449 int res
= native_encode_expr (elem
, ptr
+offset
, len
-offset
, off
);
7450 if ((off
== -1 && res
!= size
)
7463 /* Subroutine of native_encode_expr. Encode the STRING_CST
7464 specified by EXPR into the buffer PTR of length LEN bytes.
7465 Return the number of bytes placed in the buffer, or zero
7469 native_encode_string (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7471 tree type
= TREE_TYPE (expr
);
7472 HOST_WIDE_INT total_bytes
;
7474 if (TREE_CODE (type
) != ARRAY_TYPE
7475 || TREE_CODE (TREE_TYPE (type
)) != INTEGER_TYPE
7476 || GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type
))) != BITS_PER_UNIT
7477 || !tree_fits_shwi_p (TYPE_SIZE_UNIT (type
)))
7479 total_bytes
= tree_to_shwi (TYPE_SIZE_UNIT (type
));
7480 if ((off
== -1 && total_bytes
> len
)
7481 || off
>= total_bytes
)
7485 if (TREE_STRING_LENGTH (expr
) - off
< MIN (total_bytes
, len
))
7488 if (off
< TREE_STRING_LENGTH (expr
))
7490 written
= MIN (len
, TREE_STRING_LENGTH (expr
) - off
);
7491 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, written
);
7493 memset (ptr
+ written
, 0,
7494 MIN (total_bytes
- written
, len
- written
));
7497 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, MIN (total_bytes
, len
));
7498 return MIN (total_bytes
- off
, len
);
7502 /* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST,
7503 REAL_CST, COMPLEX_CST or VECTOR_CST specified by EXPR into the
7504 buffer PTR of length LEN bytes. If OFF is not -1 then start
7505 the encoding at byte offset OFF and encode at most LEN bytes.
7506 Return the number of bytes placed in the buffer, or zero upon failure. */
7509 native_encode_expr (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7511 switch (TREE_CODE (expr
))
7514 return native_encode_int (expr
, ptr
, len
, off
);
7517 return native_encode_real (expr
, ptr
, len
, off
);
7520 return native_encode_fixed (expr
, ptr
, len
, off
);
7523 return native_encode_complex (expr
, ptr
, len
, off
);
7526 return native_encode_vector (expr
, ptr
, len
, off
);
7529 return native_encode_string (expr
, ptr
, len
, off
);
7537 /* Subroutine of native_interpret_expr. Interpret the contents of
7538 the buffer PTR of length LEN as an INTEGER_CST of type TYPE.
7539 If the buffer cannot be interpreted, return NULL_TREE. */
7542 native_interpret_int (tree type
, const unsigned char *ptr
, int len
)
7544 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7546 if (total_bytes
> len
7547 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7550 wide_int result
= wi::from_buffer (ptr
, total_bytes
);
7552 return wide_int_to_tree (type
, result
);
7556 /* Subroutine of native_interpret_expr. Interpret the contents of
7557 the buffer PTR of length LEN as a FIXED_CST of type TYPE.
7558 If the buffer cannot be interpreted, return NULL_TREE. */
7561 native_interpret_fixed (tree type
, const unsigned char *ptr
, int len
)
7563 int total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7565 FIXED_VALUE_TYPE fixed_value
;
7567 if (total_bytes
> len
7568 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7571 result
= double_int::from_buffer (ptr
, total_bytes
);
7572 fixed_value
= fixed_from_double_int (result
, TYPE_MODE (type
));
7574 return build_fixed (type
, fixed_value
);
7578 /* Subroutine of native_interpret_expr. Interpret the contents of
7579 the buffer PTR of length LEN as a REAL_CST of type TYPE.
7580 If the buffer cannot be interpreted, return NULL_TREE. */
7583 native_interpret_real (tree type
, const unsigned char *ptr
, int len
)
7585 machine_mode mode
= TYPE_MODE (type
);
7586 int total_bytes
= GET_MODE_SIZE (mode
);
7587 int byte
, offset
, word
, words
, bitpos
;
7588 unsigned char value
;
7589 /* There are always 32 bits in each long, no matter the size of
7590 the hosts long. We handle floating point representations with
7595 total_bytes
= GET_MODE_SIZE (TYPE_MODE (type
));
7596 if (total_bytes
> len
|| total_bytes
> 24)
7598 words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7600 memset (tmp
, 0, sizeof (tmp
));
7601 for (bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7602 bitpos
+= BITS_PER_UNIT
)
7604 byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7605 if (UNITS_PER_WORD
< 4)
7607 word
= byte
/ UNITS_PER_WORD
;
7608 if (WORDS_BIG_ENDIAN
)
7609 word
= (words
- 1) - word
;
7610 offset
= word
* UNITS_PER_WORD
;
7611 if (BYTES_BIG_ENDIAN
)
7612 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7614 offset
+= byte
% UNITS_PER_WORD
;
7617 offset
= BYTES_BIG_ENDIAN
? 3 - byte
: byte
;
7618 value
= ptr
[offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3)];
7620 tmp
[bitpos
/ 32] |= (unsigned long)value
<< (bitpos
& 31);
7623 real_from_target (&r
, tmp
, mode
);
7624 return build_real (type
, r
);
7628 /* Subroutine of native_interpret_expr. Interpret the contents of
7629 the buffer PTR of length LEN as a COMPLEX_CST of type TYPE.
7630 If the buffer cannot be interpreted, return NULL_TREE. */
7633 native_interpret_complex (tree type
, const unsigned char *ptr
, int len
)
7635 tree etype
, rpart
, ipart
;
7638 etype
= TREE_TYPE (type
);
7639 size
= GET_MODE_SIZE (TYPE_MODE (etype
));
7642 rpart
= native_interpret_expr (etype
, ptr
, size
);
7645 ipart
= native_interpret_expr (etype
, ptr
+size
, size
);
7648 return build_complex (type
, rpart
, ipart
);
7652 /* Subroutine of native_interpret_expr. Interpret the contents of
7653 the buffer PTR of length LEN as a VECTOR_CST of type TYPE.
7654 If the buffer cannot be interpreted, return NULL_TREE. */
7657 native_interpret_vector (tree type
, const unsigned char *ptr
, int len
)
7663 etype
= TREE_TYPE (type
);
7664 size
= GET_MODE_SIZE (TYPE_MODE (etype
));
7665 count
= TYPE_VECTOR_SUBPARTS (type
);
7666 if (size
* count
> len
)
7669 elements
= XALLOCAVEC (tree
, count
);
7670 for (i
= count
- 1; i
>= 0; i
--)
7672 elem
= native_interpret_expr (etype
, ptr
+(i
*size
), size
);
7677 return build_vector (type
, elements
);
7681 /* Subroutine of fold_view_convert_expr. Interpret the contents of
7682 the buffer PTR of length LEN as a constant of type TYPE. For
7683 INTEGRAL_TYPE_P we return an INTEGER_CST, for SCALAR_FLOAT_TYPE_P
7684 we return a REAL_CST, etc... If the buffer cannot be interpreted,
7685 return NULL_TREE. */
7688 native_interpret_expr (tree type
, const unsigned char *ptr
, int len
)
7690 switch (TREE_CODE (type
))
7696 case REFERENCE_TYPE
:
7697 return native_interpret_int (type
, ptr
, len
);
7700 return native_interpret_real (type
, ptr
, len
);
7702 case FIXED_POINT_TYPE
:
7703 return native_interpret_fixed (type
, ptr
, len
);
7706 return native_interpret_complex (type
, ptr
, len
);
7709 return native_interpret_vector (type
, ptr
, len
);
7716 /* Returns true if we can interpret the contents of a native encoding
7720 can_native_interpret_type_p (tree type
)
7722 switch (TREE_CODE (type
))
7728 case REFERENCE_TYPE
:
7729 case FIXED_POINT_TYPE
:
7739 /* Fold a VIEW_CONVERT_EXPR of a constant expression EXPR to type
7740 TYPE at compile-time. If we're unable to perform the conversion
7741 return NULL_TREE. */
7744 fold_view_convert_expr (tree type
, tree expr
)
7746 /* We support up to 512-bit values (for V8DFmode). */
7747 unsigned char buffer
[64];
7750 /* Check that the host and target are sane. */
7751 if (CHAR_BIT
!= 8 || BITS_PER_UNIT
!= 8)
7754 len
= native_encode_expr (expr
, buffer
, sizeof (buffer
));
7758 return native_interpret_expr (type
, buffer
, len
);
7761 /* Build an expression for the address of T. Folds away INDIRECT_REF
7762 to avoid confusing the gimplify process. */
7765 build_fold_addr_expr_with_type_loc (location_t loc
, tree t
, tree ptrtype
)
7767 /* The size of the object is not relevant when talking about its address. */
7768 if (TREE_CODE (t
) == WITH_SIZE_EXPR
)
7769 t
= TREE_OPERAND (t
, 0);
7771 if (TREE_CODE (t
) == INDIRECT_REF
)
7773 t
= TREE_OPERAND (t
, 0);
7775 if (TREE_TYPE (t
) != ptrtype
)
7776 t
= build1_loc (loc
, NOP_EXPR
, ptrtype
, t
);
7778 else if (TREE_CODE (t
) == MEM_REF
7779 && integer_zerop (TREE_OPERAND (t
, 1)))
7780 return TREE_OPERAND (t
, 0);
7781 else if (TREE_CODE (t
) == MEM_REF
7782 && TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
)
7783 return fold_binary (POINTER_PLUS_EXPR
, ptrtype
,
7784 TREE_OPERAND (t
, 0),
7785 convert_to_ptrofftype (TREE_OPERAND (t
, 1)));
7786 else if (TREE_CODE (t
) == VIEW_CONVERT_EXPR
)
7788 t
= build_fold_addr_expr_loc (loc
, TREE_OPERAND (t
, 0));
7790 if (TREE_TYPE (t
) != ptrtype
)
7791 t
= fold_convert_loc (loc
, ptrtype
, t
);
7794 t
= build1_loc (loc
, ADDR_EXPR
, ptrtype
, t
);
7799 /* Build an expression for the address of T. */
7802 build_fold_addr_expr_loc (location_t loc
, tree t
)
7804 tree ptrtype
= build_pointer_type (TREE_TYPE (t
));
7806 return build_fold_addr_expr_with_type_loc (loc
, t
, ptrtype
);
7809 /* Fold a unary expression of code CODE and type TYPE with operand
7810 OP0. Return the folded expression if folding is successful.
7811 Otherwise, return NULL_TREE. */
7814 fold_unary_loc (location_t loc
, enum tree_code code
, tree type
, tree op0
)
7818 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
7820 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
7821 && TREE_CODE_LENGTH (code
) == 1);
7826 if (CONVERT_EXPR_CODE_P (code
)
7827 || code
== FLOAT_EXPR
|| code
== ABS_EXPR
|| code
== NEGATE_EXPR
)
7829 /* Don't use STRIP_NOPS, because signedness of argument type
7831 STRIP_SIGN_NOPS (arg0
);
7835 /* Strip any conversions that don't change the mode. This
7836 is safe for every expression, except for a comparison
7837 expression because its signedness is derived from its
7840 Note that this is done as an internal manipulation within
7841 the constant folder, in order to find the simplest
7842 representation of the arguments so that their form can be
7843 studied. In any cases, the appropriate type conversions
7844 should be put back in the tree that will get out of the
7849 if (CONSTANT_CLASS_P (arg0
))
7851 tree tem
= const_unop (code
, type
, arg0
);
7854 if (TREE_TYPE (tem
) != type
)
7855 tem
= fold_convert_loc (loc
, type
, tem
);
7861 tem
= generic_simplify (loc
, code
, type
, op0
);
7865 if (TREE_CODE_CLASS (code
) == tcc_unary
)
7867 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
7868 return build2 (COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
7869 fold_build1_loc (loc
, code
, type
,
7870 fold_convert_loc (loc
, TREE_TYPE (op0
),
7871 TREE_OPERAND (arg0
, 1))));
7872 else if (TREE_CODE (arg0
) == COND_EXPR
)
7874 tree arg01
= TREE_OPERAND (arg0
, 1);
7875 tree arg02
= TREE_OPERAND (arg0
, 2);
7876 if (! VOID_TYPE_P (TREE_TYPE (arg01
)))
7877 arg01
= fold_build1_loc (loc
, code
, type
,
7878 fold_convert_loc (loc
,
7879 TREE_TYPE (op0
), arg01
));
7880 if (! VOID_TYPE_P (TREE_TYPE (arg02
)))
7881 arg02
= fold_build1_loc (loc
, code
, type
,
7882 fold_convert_loc (loc
,
7883 TREE_TYPE (op0
), arg02
));
7884 tem
= fold_build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
7887 /* If this was a conversion, and all we did was to move into
7888 inside the COND_EXPR, bring it back out. But leave it if
7889 it is a conversion from integer to integer and the
7890 result precision is no wider than a word since such a
7891 conversion is cheap and may be optimized away by combine,
7892 while it couldn't if it were outside the COND_EXPR. Then return
7893 so we don't get into an infinite recursion loop taking the
7894 conversion out and then back in. */
7896 if ((CONVERT_EXPR_CODE_P (code
)
7897 || code
== NON_LVALUE_EXPR
)
7898 && TREE_CODE (tem
) == COND_EXPR
7899 && TREE_CODE (TREE_OPERAND (tem
, 1)) == code
7900 && TREE_CODE (TREE_OPERAND (tem
, 2)) == code
7901 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 1))
7902 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 2))
7903 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))
7904 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 2), 0)))
7905 && (! (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
7907 (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))))
7908 && TYPE_PRECISION (TREE_TYPE (tem
)) <= BITS_PER_WORD
)
7909 || flag_syntax_only
))
7910 tem
= build1_loc (loc
, code
, type
,
7912 TREE_TYPE (TREE_OPERAND
7913 (TREE_OPERAND (tem
, 1), 0)),
7914 TREE_OPERAND (tem
, 0),
7915 TREE_OPERAND (TREE_OPERAND (tem
, 1), 0),
7916 TREE_OPERAND (TREE_OPERAND (tem
, 2),
7924 case NON_LVALUE_EXPR
:
7925 if (!maybe_lvalue_p (op0
))
7926 return fold_convert_loc (loc
, type
, op0
);
7931 case FIX_TRUNC_EXPR
:
7932 if (COMPARISON_CLASS_P (op0
))
7934 /* If we have (type) (a CMP b) and type is an integral type, return
7935 new expression involving the new type. Canonicalize
7936 (type) (a CMP b) to (a CMP b) ? (type) true : (type) false for
7938 Do not fold the result as that would not simplify further, also
7939 folding again results in recursions. */
7940 if (TREE_CODE (type
) == BOOLEAN_TYPE
)
7941 return build2_loc (loc
, TREE_CODE (op0
), type
,
7942 TREE_OPERAND (op0
, 0),
7943 TREE_OPERAND (op0
, 1));
7944 else if (!INTEGRAL_TYPE_P (type
) && !VOID_TYPE_P (type
)
7945 && TREE_CODE (type
) != VECTOR_TYPE
)
7946 return build3_loc (loc
, COND_EXPR
, type
, op0
,
7947 constant_boolean_node (true, type
),
7948 constant_boolean_node (false, type
));
7951 /* Handle (T *)&A.B.C for A being of type T and B and C
7952 living at offset zero. This occurs frequently in
7953 C++ upcasting and then accessing the base. */
7954 if (TREE_CODE (op0
) == ADDR_EXPR
7955 && POINTER_TYPE_P (type
)
7956 && handled_component_p (TREE_OPERAND (op0
, 0)))
7958 HOST_WIDE_INT bitsize
, bitpos
;
7961 int unsignedp
, volatilep
;
7962 tree base
= TREE_OPERAND (op0
, 0);
7963 base
= get_inner_reference (base
, &bitsize
, &bitpos
, &offset
,
7964 &mode
, &unsignedp
, &volatilep
, false);
7965 /* If the reference was to a (constant) zero offset, we can use
7966 the address of the base if it has the same base type
7967 as the result type and the pointer type is unqualified. */
7968 if (! offset
&& bitpos
== 0
7969 && (TYPE_MAIN_VARIANT (TREE_TYPE (type
))
7970 == TYPE_MAIN_VARIANT (TREE_TYPE (base
)))
7971 && TYPE_QUALS (type
) == TYPE_UNQUALIFIED
)
7972 return fold_convert_loc (loc
, type
,
7973 build_fold_addr_expr_loc (loc
, base
));
7976 if (TREE_CODE (op0
) == MODIFY_EXPR
7977 && TREE_CONSTANT (TREE_OPERAND (op0
, 1))
7978 /* Detect assigning a bitfield. */
7979 && !(TREE_CODE (TREE_OPERAND (op0
, 0)) == COMPONENT_REF
7981 (TREE_OPERAND (TREE_OPERAND (op0
, 0), 1))))
7983 /* Don't leave an assignment inside a conversion
7984 unless assigning a bitfield. */
7985 tem
= fold_build1_loc (loc
, code
, type
, TREE_OPERAND (op0
, 1));
7986 /* First do the assignment, then return converted constant. */
7987 tem
= build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (tem
), op0
, tem
);
7988 TREE_NO_WARNING (tem
) = 1;
7989 TREE_USED (tem
) = 1;
7993 /* Convert (T)(x & c) into (T)x & (T)c, if c is an integer
7994 constants (if x has signed type, the sign bit cannot be set
7995 in c). This folds extension into the BIT_AND_EXPR.
7996 ??? We don't do it for BOOLEAN_TYPE or ENUMERAL_TYPE because they
7997 very likely don't have maximal range for their precision and this
7998 transformation effectively doesn't preserve non-maximal ranges. */
7999 if (TREE_CODE (type
) == INTEGER_TYPE
8000 && TREE_CODE (op0
) == BIT_AND_EXPR
8001 && TREE_CODE (TREE_OPERAND (op0
, 1)) == INTEGER_CST
)
8003 tree and_expr
= op0
;
8004 tree and0
= TREE_OPERAND (and_expr
, 0);
8005 tree and1
= TREE_OPERAND (and_expr
, 1);
8008 if (TYPE_UNSIGNED (TREE_TYPE (and_expr
))
8009 || (TYPE_PRECISION (type
)
8010 <= TYPE_PRECISION (TREE_TYPE (and_expr
))))
8012 else if (TYPE_PRECISION (TREE_TYPE (and1
))
8013 <= HOST_BITS_PER_WIDE_INT
8014 && tree_fits_uhwi_p (and1
))
8016 unsigned HOST_WIDE_INT cst
;
8018 cst
= tree_to_uhwi (and1
);
8019 cst
&= HOST_WIDE_INT_M1U
8020 << (TYPE_PRECISION (TREE_TYPE (and1
)) - 1);
8021 change
= (cst
== 0);
8022 #ifdef LOAD_EXTEND_OP
8024 && !flag_syntax_only
8025 && (LOAD_EXTEND_OP (TYPE_MODE (TREE_TYPE (and0
)))
8028 tree uns
= unsigned_type_for (TREE_TYPE (and0
));
8029 and0
= fold_convert_loc (loc
, uns
, and0
);
8030 and1
= fold_convert_loc (loc
, uns
, and1
);
8036 tem
= force_fit_type (type
, wi::to_widest (and1
), 0,
8037 TREE_OVERFLOW (and1
));
8038 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
8039 fold_convert_loc (loc
, type
, and0
), tem
);
8043 /* Convert (T1)(X p+ Y) into ((T1)X p+ Y), for pointer type,
8044 when one of the new casts will fold away. Conservatively we assume
8045 that this happens when X or Y is NOP_EXPR or Y is INTEGER_CST. */
8046 if (POINTER_TYPE_P (type
)
8047 && TREE_CODE (arg0
) == POINTER_PLUS_EXPR
8048 && (!TYPE_RESTRICT (type
) || TYPE_RESTRICT (TREE_TYPE (arg0
)))
8049 && (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
8050 || TREE_CODE (TREE_OPERAND (arg0
, 0)) == NOP_EXPR
8051 || TREE_CODE (TREE_OPERAND (arg0
, 1)) == NOP_EXPR
))
8053 tree arg00
= TREE_OPERAND (arg0
, 0);
8054 tree arg01
= TREE_OPERAND (arg0
, 1);
8056 return fold_build_pointer_plus_loc
8057 (loc
, fold_convert_loc (loc
, type
, arg00
), arg01
);
8060 /* Convert (T1)(~(T2)X) into ~(T1)X if T1 and T2 are integral types
8061 of the same precision, and X is an integer type not narrower than
8062 types T1 or T2, i.e. the cast (T2)X isn't an extension. */
8063 if (INTEGRAL_TYPE_P (type
)
8064 && TREE_CODE (op0
) == BIT_NOT_EXPR
8065 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8066 && CONVERT_EXPR_P (TREE_OPERAND (op0
, 0))
8067 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (op0
)))
8069 tem
= TREE_OPERAND (TREE_OPERAND (op0
, 0), 0);
8070 if (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
8071 && TYPE_PRECISION (type
) <= TYPE_PRECISION (TREE_TYPE (tem
)))
8072 return fold_build1_loc (loc
, BIT_NOT_EXPR
, type
,
8073 fold_convert_loc (loc
, type
, tem
));
8076 /* Convert (T1)(X * Y) into (T1)X * (T1)Y if T1 is narrower than the
8077 type of X and Y (integer types only). */
8078 if (INTEGRAL_TYPE_P (type
)
8079 && TREE_CODE (op0
) == MULT_EXPR
8080 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8081 && TYPE_PRECISION (type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8083 /* Be careful not to introduce new overflows. */
8085 if (TYPE_OVERFLOW_WRAPS (type
))
8088 mult_type
= unsigned_type_for (type
);
8090 if (TYPE_PRECISION (mult_type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8092 tem
= fold_build2_loc (loc
, MULT_EXPR
, mult_type
,
8093 fold_convert_loc (loc
, mult_type
,
8094 TREE_OPERAND (op0
, 0)),
8095 fold_convert_loc (loc
, mult_type
,
8096 TREE_OPERAND (op0
, 1)));
8097 return fold_convert_loc (loc
, type
, tem
);
8103 case VIEW_CONVERT_EXPR
:
8104 if (TREE_CODE (op0
) == MEM_REF
)
8105 return fold_build2_loc (loc
, MEM_REF
, type
,
8106 TREE_OPERAND (op0
, 0), TREE_OPERAND (op0
, 1));
8111 tem
= fold_negate_expr (loc
, arg0
);
8113 return fold_convert_loc (loc
, type
, tem
);
8117 /* Convert fabs((double)float) into (double)fabsf(float). */
8118 if (TREE_CODE (arg0
) == NOP_EXPR
8119 && TREE_CODE (type
) == REAL_TYPE
)
8121 tree targ0
= strip_float_extensions (arg0
);
8123 return fold_convert_loc (loc
, type
,
8124 fold_build1_loc (loc
, ABS_EXPR
,
8129 /* Strip sign ops from argument. */
8130 if (TREE_CODE (type
) == REAL_TYPE
)
8132 tem
= fold_strip_sign_ops (arg0
);
8134 return fold_build1_loc (loc
, ABS_EXPR
, type
,
8135 fold_convert_loc (loc
, type
, tem
));
8140 if (TREE_CODE (TREE_TYPE (arg0
)) != COMPLEX_TYPE
)
8141 return fold_convert_loc (loc
, type
, arg0
);
8142 if (TREE_CODE (arg0
) == COMPLEX_EXPR
)
8144 tree itype
= TREE_TYPE (type
);
8145 tree rpart
= fold_convert_loc (loc
, itype
, TREE_OPERAND (arg0
, 0));
8146 tree ipart
= fold_convert_loc (loc
, itype
, TREE_OPERAND (arg0
, 1));
8147 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
,
8148 negate_expr (ipart
));
8150 if (TREE_CODE (arg0
) == CONJ_EXPR
)
8151 return fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
8155 /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
8156 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8157 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8158 fold_convert_loc (loc
, type
,
8159 TREE_OPERAND (arg0
, 0)))))
8160 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
, tem
,
8161 fold_convert_loc (loc
, type
,
8162 TREE_OPERAND (arg0
, 1)));
8163 else if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8164 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8165 fold_convert_loc (loc
, type
,
8166 TREE_OPERAND (arg0
, 1)))))
8167 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
,
8168 fold_convert_loc (loc
, type
,
8169 TREE_OPERAND (arg0
, 0)), tem
);
8173 case TRUTH_NOT_EXPR
:
8174 /* Note that the operand of this must be an int
8175 and its values must be 0 or 1.
8176 ("true" is a fixed value perhaps depending on the language,
8177 but we don't handle values other than 1 correctly yet.) */
8178 tem
= fold_truth_not_expr (loc
, arg0
);
8181 return fold_convert_loc (loc
, type
, tem
);
8184 if (TREE_CODE (TREE_TYPE (arg0
)) != COMPLEX_TYPE
)
8185 return fold_convert_loc (loc
, type
, arg0
);
8186 if (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
8188 tree itype
= TREE_TYPE (TREE_TYPE (arg0
));
8189 tem
= fold_build2_loc (loc
, TREE_CODE (arg0
), itype
,
8190 fold_build1_loc (loc
, REALPART_EXPR
, itype
,
8191 TREE_OPERAND (arg0
, 0)),
8192 fold_build1_loc (loc
, REALPART_EXPR
, itype
,
8193 TREE_OPERAND (arg0
, 1)));
8194 return fold_convert_loc (loc
, type
, tem
);
8196 if (TREE_CODE (arg0
) == CONJ_EXPR
)
8198 tree itype
= TREE_TYPE (TREE_TYPE (arg0
));
8199 tem
= fold_build1_loc (loc
, REALPART_EXPR
, itype
,
8200 TREE_OPERAND (arg0
, 0));
8201 return fold_convert_loc (loc
, type
, tem
);
8203 if (TREE_CODE (arg0
) == CALL_EXPR
)
8205 tree fn
= get_callee_fndecl (arg0
);
8206 if (fn
&& DECL_BUILT_IN_CLASS (fn
) == BUILT_IN_NORMAL
)
8207 switch (DECL_FUNCTION_CODE (fn
))
8209 CASE_FLT_FN (BUILT_IN_CEXPI
):
8210 fn
= mathfn_built_in (type
, BUILT_IN_COS
);
8212 return build_call_expr_loc (loc
, fn
, 1, CALL_EXPR_ARG (arg0
, 0));
8222 if (TREE_CODE (TREE_TYPE (arg0
)) != COMPLEX_TYPE
)
8223 return build_zero_cst (type
);
8224 if (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
8226 tree itype
= TREE_TYPE (TREE_TYPE (arg0
));
8227 tem
= fold_build2_loc (loc
, TREE_CODE (arg0
), itype
,
8228 fold_build1_loc (loc
, IMAGPART_EXPR
, itype
,
8229 TREE_OPERAND (arg0
, 0)),
8230 fold_build1_loc (loc
, IMAGPART_EXPR
, itype
,
8231 TREE_OPERAND (arg0
, 1)));
8232 return fold_convert_loc (loc
, type
, tem
);
8234 if (TREE_CODE (arg0
) == CONJ_EXPR
)
8236 tree itype
= TREE_TYPE (TREE_TYPE (arg0
));
8237 tem
= fold_build1_loc (loc
, IMAGPART_EXPR
, itype
, TREE_OPERAND (arg0
, 0));
8238 return fold_convert_loc (loc
, type
, negate_expr (tem
));
8240 if (TREE_CODE (arg0
) == CALL_EXPR
)
8242 tree fn
= get_callee_fndecl (arg0
);
8243 if (fn
&& DECL_BUILT_IN_CLASS (fn
) == BUILT_IN_NORMAL
)
8244 switch (DECL_FUNCTION_CODE (fn
))
8246 CASE_FLT_FN (BUILT_IN_CEXPI
):
8247 fn
= mathfn_built_in (type
, BUILT_IN_SIN
);
8249 return build_call_expr_loc (loc
, fn
, 1, CALL_EXPR_ARG (arg0
, 0));
8259 /* Fold *&X to X if X is an lvalue. */
8260 if (TREE_CODE (op0
) == ADDR_EXPR
)
8262 tree op00
= TREE_OPERAND (op0
, 0);
8263 if ((TREE_CODE (op00
) == VAR_DECL
8264 || TREE_CODE (op00
) == PARM_DECL
8265 || TREE_CODE (op00
) == RESULT_DECL
)
8266 && !TREE_READONLY (op00
))
8273 } /* switch (code) */
8277 /* If the operation was a conversion do _not_ mark a resulting constant
8278 with TREE_OVERFLOW if the original constant was not. These conversions
8279 have implementation defined behavior and retaining the TREE_OVERFLOW
8280 flag here would confuse later passes such as VRP. */
8282 fold_unary_ignore_overflow_loc (location_t loc
, enum tree_code code
,
8283 tree type
, tree op0
)
8285 tree res
= fold_unary_loc (loc
, code
, type
, op0
);
8287 && TREE_CODE (res
) == INTEGER_CST
8288 && TREE_CODE (op0
) == INTEGER_CST
8289 && CONVERT_EXPR_CODE_P (code
))
8290 TREE_OVERFLOW (res
) = TREE_OVERFLOW (op0
);
8295 /* Fold a binary bitwise/truth expression of code CODE and type TYPE with
8296 operands OP0 and OP1. LOC is the location of the resulting expression.
8297 ARG0 and ARG1 are the NOP_STRIPed results of OP0 and OP1.
8298 Return the folded expression if folding is successful. Otherwise,
8299 return NULL_TREE. */
8301 fold_truth_andor (location_t loc
, enum tree_code code
, tree type
,
8302 tree arg0
, tree arg1
, tree op0
, tree op1
)
8306 /* We only do these simplifications if we are optimizing. */
8310 /* Check for things like (A || B) && (A || C). We can convert this
8311 to A || (B && C). Note that either operator can be any of the four
8312 truth and/or operations and the transformation will still be
8313 valid. Also note that we only care about order for the
8314 ANDIF and ORIF operators. If B contains side effects, this
8315 might change the truth-value of A. */
8316 if (TREE_CODE (arg0
) == TREE_CODE (arg1
)
8317 && (TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
8318 || TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
8319 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
8320 || TREE_CODE (arg0
) == TRUTH_OR_EXPR
)
8321 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0
, 1)))
8323 tree a00
= TREE_OPERAND (arg0
, 0);
8324 tree a01
= TREE_OPERAND (arg0
, 1);
8325 tree a10
= TREE_OPERAND (arg1
, 0);
8326 tree a11
= TREE_OPERAND (arg1
, 1);
8327 int commutative
= ((TREE_CODE (arg0
) == TRUTH_OR_EXPR
8328 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
)
8329 && (code
== TRUTH_AND_EXPR
8330 || code
== TRUTH_OR_EXPR
));
8332 if (operand_equal_p (a00
, a10
, 0))
8333 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8334 fold_build2_loc (loc
, code
, type
, a01
, a11
));
8335 else if (commutative
&& operand_equal_p (a00
, a11
, 0))
8336 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8337 fold_build2_loc (loc
, code
, type
, a01
, a10
));
8338 else if (commutative
&& operand_equal_p (a01
, a10
, 0))
8339 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a01
,
8340 fold_build2_loc (loc
, code
, type
, a00
, a11
));
8342 /* This case if tricky because we must either have commutative
8343 operators or else A10 must not have side-effects. */
8345 else if ((commutative
|| ! TREE_SIDE_EFFECTS (a10
))
8346 && operand_equal_p (a01
, a11
, 0))
8347 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
8348 fold_build2_loc (loc
, code
, type
, a00
, a10
),
8352 /* See if we can build a range comparison. */
8353 if (0 != (tem
= fold_range_test (loc
, code
, type
, op0
, op1
)))
8356 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
)
8357 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
))
8359 tem
= merge_truthop_with_opposite_arm (loc
, arg0
, arg1
, true);
8361 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
8364 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ORIF_EXPR
)
8365 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ANDIF_EXPR
))
8367 tem
= merge_truthop_with_opposite_arm (loc
, arg1
, arg0
, false);
8369 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
8372 /* Check for the possibility of merging component references. If our
8373 lhs is another similar operation, try to merge its rhs with our
8374 rhs. Then try to merge our lhs and rhs. */
8375 if (TREE_CODE (arg0
) == code
8376 && 0 != (tem
= fold_truth_andor_1 (loc
, code
, type
,
8377 TREE_OPERAND (arg0
, 1), arg1
)))
8378 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), tem
);
8380 if ((tem
= fold_truth_andor_1 (loc
, code
, type
, arg0
, arg1
)) != 0)
8383 if (LOGICAL_OP_NON_SHORT_CIRCUIT
8384 && (code
== TRUTH_AND_EXPR
8385 || code
== TRUTH_ANDIF_EXPR
8386 || code
== TRUTH_OR_EXPR
8387 || code
== TRUTH_ORIF_EXPR
))
8389 enum tree_code ncode
, icode
;
8391 ncode
= (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_AND_EXPR
)
8392 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
;
8393 icode
= ncode
== TRUTH_AND_EXPR
? TRUTH_ANDIF_EXPR
: TRUTH_ORIF_EXPR
;
8395 /* Transform ((A AND-IF B) AND[-IF] C) into (A AND-IF (B AND C)),
8396 or ((A OR-IF B) OR[-IF] C) into (A OR-IF (B OR C))
8397 We don't want to pack more than two leafs to a non-IF AND/OR
8399 If tree-code of left-hand operand isn't an AND/OR-IF code and not
8400 equal to IF-CODE, then we don't want to add right-hand operand.
8401 If the inner right-hand side of left-hand operand has
8402 side-effects, or isn't simple, then we can't add to it,
8403 as otherwise we might destroy if-sequence. */
8404 if (TREE_CODE (arg0
) == icode
8405 && simple_operand_p_2 (arg1
)
8406 /* Needed for sequence points to handle trappings, and
8408 && simple_operand_p_2 (TREE_OPERAND (arg0
, 1)))
8410 tem
= fold_build2_loc (loc
, ncode
, type
, TREE_OPERAND (arg0
, 1),
8412 return fold_build2_loc (loc
, icode
, type
, TREE_OPERAND (arg0
, 0),
8415 /* Same as abouve but for (A AND[-IF] (B AND-IF C)) -> ((A AND B) AND-IF C),
8416 or (A OR[-IF] (B OR-IF C) -> ((A OR B) OR-IF C). */
8417 else if (TREE_CODE (arg1
) == icode
8418 && simple_operand_p_2 (arg0
)
8419 /* Needed for sequence points to handle trappings, and
8421 && simple_operand_p_2 (TREE_OPERAND (arg1
, 0)))
8423 tem
= fold_build2_loc (loc
, ncode
, type
,
8424 arg0
, TREE_OPERAND (arg1
, 0));
8425 return fold_build2_loc (loc
, icode
, type
, tem
,
8426 TREE_OPERAND (arg1
, 1));
8428 /* Transform (A AND-IF B) into (A AND B), or (A OR-IF B)
8430 For sequence point consistancy, we need to check for trapping,
8431 and side-effects. */
8432 else if (code
== icode
&& simple_operand_p_2 (arg0
)
8433 && simple_operand_p_2 (arg1
))
8434 return fold_build2_loc (loc
, ncode
, type
, arg0
, arg1
);
8440 /* Fold a binary expression of code CODE and type TYPE with operands
8441 OP0 and OP1, containing either a MIN-MAX or a MAX-MIN combination.
8442 Return the folded expression if folding is successful. Otherwise,
8443 return NULL_TREE. */
8446 fold_minmax (location_t loc
, enum tree_code code
, tree type
, tree op0
, tree op1
)
8448 enum tree_code compl_code
;
8450 if (code
== MIN_EXPR
)
8451 compl_code
= MAX_EXPR
;
8452 else if (code
== MAX_EXPR
)
8453 compl_code
= MIN_EXPR
;
8457 /* MIN (MAX (a, b), b) == b. */
8458 if (TREE_CODE (op0
) == compl_code
8459 && operand_equal_p (TREE_OPERAND (op0
, 1), op1
, 0))
8460 return omit_one_operand_loc (loc
, type
, op1
, TREE_OPERAND (op0
, 0));
8462 /* MIN (MAX (b, a), b) == b. */
8463 if (TREE_CODE (op0
) == compl_code
8464 && operand_equal_p (TREE_OPERAND (op0
, 0), op1
, 0)
8465 && reorder_operands_p (TREE_OPERAND (op0
, 1), op1
))
8466 return omit_one_operand_loc (loc
, type
, op1
, TREE_OPERAND (op0
, 1));
8468 /* MIN (a, MAX (a, b)) == a. */
8469 if (TREE_CODE (op1
) == compl_code
8470 && operand_equal_p (op0
, TREE_OPERAND (op1
, 0), 0)
8471 && reorder_operands_p (op0
, TREE_OPERAND (op1
, 1)))
8472 return omit_one_operand_loc (loc
, type
, op0
, TREE_OPERAND (op1
, 1));
8474 /* MIN (a, MAX (b, a)) == a. */
8475 if (TREE_CODE (op1
) == compl_code
8476 && operand_equal_p (op0
, TREE_OPERAND (op1
, 1), 0)
8477 && reorder_operands_p (op0
, TREE_OPERAND (op1
, 0)))
8478 return omit_one_operand_loc (loc
, type
, op0
, TREE_OPERAND (op1
, 0));
8483 /* Helper that tries to canonicalize the comparison ARG0 CODE ARG1
8484 by changing CODE to reduce the magnitude of constants involved in
8485 ARG0 of the comparison.
8486 Returns a canonicalized comparison tree if a simplification was
8487 possible, otherwise returns NULL_TREE.
8488 Set *STRICT_OVERFLOW_P to true if the canonicalization is only
8489 valid if signed overflow is undefined. */
8492 maybe_canonicalize_comparison_1 (location_t loc
, enum tree_code code
, tree type
,
8493 tree arg0
, tree arg1
,
8494 bool *strict_overflow_p
)
8496 enum tree_code code0
= TREE_CODE (arg0
);
8497 tree t
, cst0
= NULL_TREE
;
8501 /* Match A +- CST code arg1 and CST code arg1. We can change the
8502 first form only if overflow is undefined. */
8503 if (!(((ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
8504 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
)))
8505 /* In principle pointers also have undefined overflow behavior,
8506 but that causes problems elsewhere. */
8507 && !POINTER_TYPE_P (TREE_TYPE (arg0
))
8508 && (code0
== MINUS_EXPR
8509 || code0
== PLUS_EXPR
)
8510 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
8511 || code0
== INTEGER_CST
))
8514 /* Identify the constant in arg0 and its sign. */
8515 if (code0
== INTEGER_CST
)
8518 cst0
= TREE_OPERAND (arg0
, 1);
8519 sgn0
= tree_int_cst_sgn (cst0
);
8521 /* Overflowed constants and zero will cause problems. */
8522 if (integer_zerop (cst0
)
8523 || TREE_OVERFLOW (cst0
))
8526 /* See if we can reduce the magnitude of the constant in
8527 arg0 by changing the comparison code. */
8528 if (code0
== INTEGER_CST
)
8530 /* CST <= arg1 -> CST-1 < arg1. */
8531 if (code
== LE_EXPR
&& sgn0
== 1)
8533 /* -CST < arg1 -> -CST-1 <= arg1. */
8534 else if (code
== LT_EXPR
&& sgn0
== -1)
8536 /* CST > arg1 -> CST-1 >= arg1. */
8537 else if (code
== GT_EXPR
&& sgn0
== 1)
8539 /* -CST >= arg1 -> -CST-1 > arg1. */
8540 else if (code
== GE_EXPR
&& sgn0
== -1)
8544 /* arg1 code' CST' might be more canonical. */
8549 /* A - CST < arg1 -> A - CST-1 <= arg1. */
8551 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
8553 /* A + CST > arg1 -> A + CST-1 >= arg1. */
8554 else if (code
== GT_EXPR
8555 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
8557 /* A + CST <= arg1 -> A + CST-1 < arg1. */
8558 else if (code
== LE_EXPR
8559 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
8561 /* A - CST >= arg1 -> A - CST-1 > arg1. */
8562 else if (code
== GE_EXPR
8563 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
8567 *strict_overflow_p
= true;
8570 /* Now build the constant reduced in magnitude. But not if that
8571 would produce one outside of its types range. */
8572 if (INTEGRAL_TYPE_P (TREE_TYPE (cst0
))
8574 && TYPE_MIN_VALUE (TREE_TYPE (cst0
))
8575 && tree_int_cst_equal (cst0
, TYPE_MIN_VALUE (TREE_TYPE (cst0
))))
8577 && TYPE_MAX_VALUE (TREE_TYPE (cst0
))
8578 && tree_int_cst_equal (cst0
, TYPE_MAX_VALUE (TREE_TYPE (cst0
))))))
8579 /* We cannot swap the comparison here as that would cause us to
8580 endlessly recurse. */
8583 t
= int_const_binop (sgn0
== -1 ? PLUS_EXPR
: MINUS_EXPR
,
8584 cst0
, build_int_cst (TREE_TYPE (cst0
), 1));
8585 if (code0
!= INTEGER_CST
)
8586 t
= fold_build2_loc (loc
, code0
, TREE_TYPE (arg0
), TREE_OPERAND (arg0
, 0), t
);
8587 t
= fold_convert (TREE_TYPE (arg1
), t
);
8589 /* If swapping might yield to a more canonical form, do so. */
8591 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
, arg1
, t
);
8593 return fold_build2_loc (loc
, code
, type
, t
, arg1
);
8596 /* Canonicalize the comparison ARG0 CODE ARG1 with type TYPE with undefined
8597 overflow further. Try to decrease the magnitude of constants involved
8598 by changing LE_EXPR and GE_EXPR to LT_EXPR and GT_EXPR or vice versa
8599 and put sole constants at the second argument position.
8600 Returns the canonicalized tree if changed, otherwise NULL_TREE. */
8603 maybe_canonicalize_comparison (location_t loc
, enum tree_code code
, tree type
,
8604 tree arg0
, tree arg1
)
8607 bool strict_overflow_p
;
8608 const char * const warnmsg
= G_("assuming signed overflow does not occur "
8609 "when reducing constant in comparison");
8611 /* Try canonicalization by simplifying arg0. */
8612 strict_overflow_p
= false;
8613 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg0
, arg1
,
8614 &strict_overflow_p
);
8617 if (strict_overflow_p
)
8618 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
8622 /* Try canonicalization by simplifying arg1 using the swapped
8624 code
= swap_tree_comparison (code
);
8625 strict_overflow_p
= false;
8626 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg1
, arg0
,
8627 &strict_overflow_p
);
8628 if (t
&& strict_overflow_p
)
8629 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
8633 /* Return whether BASE + OFFSET + BITPOS may wrap around the address
8634 space. This is used to avoid issuing overflow warnings for
8635 expressions like &p->x which can not wrap. */
8638 pointer_may_wrap_p (tree base
, tree offset
, HOST_WIDE_INT bitpos
)
8640 if (!POINTER_TYPE_P (TREE_TYPE (base
)))
8647 int precision
= TYPE_PRECISION (TREE_TYPE (base
));
8648 if (offset
== NULL_TREE
)
8649 wi_offset
= wi::zero (precision
);
8650 else if (TREE_CODE (offset
) != INTEGER_CST
|| TREE_OVERFLOW (offset
))
8656 wide_int units
= wi::shwi (bitpos
/ BITS_PER_UNIT
, precision
);
8657 wide_int total
= wi::add (wi_offset
, units
, UNSIGNED
, &overflow
);
8661 if (!wi::fits_uhwi_p (total
))
8664 HOST_WIDE_INT size
= int_size_in_bytes (TREE_TYPE (TREE_TYPE (base
)));
8668 /* We can do slightly better for SIZE if we have an ADDR_EXPR of an
8670 if (TREE_CODE (base
) == ADDR_EXPR
)
8672 HOST_WIDE_INT base_size
;
8674 base_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (base
, 0)));
8675 if (base_size
> 0 && size
< base_size
)
8679 return total
.to_uhwi () > (unsigned HOST_WIDE_INT
) size
;
8682 /* Return the HOST_WIDE_INT least significant bits of T, a sizetype
8683 kind INTEGER_CST. This makes sure to properly sign-extend the
8686 static HOST_WIDE_INT
8687 size_low_cst (const_tree t
)
8689 HOST_WIDE_INT w
= TREE_INT_CST_ELT (t
, 0);
8690 int prec
= TYPE_PRECISION (TREE_TYPE (t
));
8691 if (prec
< HOST_BITS_PER_WIDE_INT
)
8692 return sext_hwi (w
, prec
);
8696 /* Subroutine of fold_binary. This routine performs all of the
8697 transformations that are common to the equality/inequality
8698 operators (EQ_EXPR and NE_EXPR) and the ordering operators
8699 (LT_EXPR, LE_EXPR, GE_EXPR and GT_EXPR). Callers other than
8700 fold_binary should call fold_binary. Fold a comparison with
8701 tree code CODE and type TYPE with operands OP0 and OP1. Return
8702 the folded comparison or NULL_TREE. */
8705 fold_comparison (location_t loc
, enum tree_code code
, tree type
,
8708 const bool equality_code
= (code
== EQ_EXPR
|| code
== NE_EXPR
);
8709 tree arg0
, arg1
, tem
;
8714 STRIP_SIGN_NOPS (arg0
);
8715 STRIP_SIGN_NOPS (arg1
);
8717 /* Transform comparisons of the form X +- C1 CMP C2 to X CMP C2 -+ C1. */
8718 if ((TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
8720 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
8721 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
8722 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
8723 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1))
8724 && TREE_CODE (arg1
) == INTEGER_CST
8725 && !TREE_OVERFLOW (arg1
))
8727 const enum tree_code
8728 reverse_op
= TREE_CODE (arg0
) == PLUS_EXPR
? MINUS_EXPR
: PLUS_EXPR
;
8729 tree const1
= TREE_OPERAND (arg0
, 1);
8730 tree const2
= fold_convert_loc (loc
, TREE_TYPE (const1
), arg1
);
8731 tree variable
= TREE_OPERAND (arg0
, 0);
8732 tree new_const
= int_const_binop (reverse_op
, const2
, const1
);
8734 /* If the constant operation overflowed this can be
8735 simplified as a comparison against INT_MAX/INT_MIN. */
8736 if (TREE_OVERFLOW (new_const
)
8737 && !TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
8739 int const1_sgn
= tree_int_cst_sgn (const1
);
8740 enum tree_code code2
= code
;
8742 /* Get the sign of the constant on the lhs if the
8743 operation were VARIABLE + CONST1. */
8744 if (TREE_CODE (arg0
) == MINUS_EXPR
)
8745 const1_sgn
= -const1_sgn
;
8747 /* The sign of the constant determines if we overflowed
8748 INT_MAX (const1_sgn == -1) or INT_MIN (const1_sgn == 1).
8749 Canonicalize to the INT_MIN overflow by swapping the comparison
8751 if (const1_sgn
== -1)
8752 code2
= swap_tree_comparison (code
);
8754 /* We now can look at the canonicalized case
8755 VARIABLE + 1 CODE2 INT_MIN
8756 and decide on the result. */
8763 omit_one_operand_loc (loc
, type
, boolean_false_node
, variable
);
8769 omit_one_operand_loc (loc
, type
, boolean_true_node
, variable
);
8778 fold_overflow_warning ("assuming signed overflow does not occur "
8779 "when changing X +- C1 cmp C2 to "
8781 WARN_STRICT_OVERFLOW_COMPARISON
);
8782 return fold_build2_loc (loc
, code
, type
, variable
, new_const
);
8786 /* For comparisons of pointers we can decompose it to a compile time
8787 comparison of the base objects and the offsets into the object.
8788 This requires at least one operand being an ADDR_EXPR or a
8789 POINTER_PLUS_EXPR to do more than the operand_equal_p test below. */
8790 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
8791 && (TREE_CODE (arg0
) == ADDR_EXPR
8792 || TREE_CODE (arg1
) == ADDR_EXPR
8793 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
8794 || TREE_CODE (arg1
) == POINTER_PLUS_EXPR
))
8796 tree base0
, base1
, offset0
= NULL_TREE
, offset1
= NULL_TREE
;
8797 HOST_WIDE_INT bitsize
, bitpos0
= 0, bitpos1
= 0;
8799 int volatilep
, unsignedp
;
8800 bool indirect_base0
= false, indirect_base1
= false;
8802 /* Get base and offset for the access. Strip ADDR_EXPR for
8803 get_inner_reference, but put it back by stripping INDIRECT_REF
8804 off the base object if possible. indirect_baseN will be true
8805 if baseN is not an address but refers to the object itself. */
8807 if (TREE_CODE (arg0
) == ADDR_EXPR
)
8809 base0
= get_inner_reference (TREE_OPERAND (arg0
, 0),
8810 &bitsize
, &bitpos0
, &offset0
, &mode
,
8811 &unsignedp
, &volatilep
, false);
8812 if (TREE_CODE (base0
) == INDIRECT_REF
)
8813 base0
= TREE_OPERAND (base0
, 0);
8815 indirect_base0
= true;
8817 else if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
)
8819 base0
= TREE_OPERAND (arg0
, 0);
8820 STRIP_SIGN_NOPS (base0
);
8821 if (TREE_CODE (base0
) == ADDR_EXPR
)
8823 base0
= TREE_OPERAND (base0
, 0);
8824 indirect_base0
= true;
8826 offset0
= TREE_OPERAND (arg0
, 1);
8827 if (tree_fits_shwi_p (offset0
))
8829 HOST_WIDE_INT off
= size_low_cst (offset0
);
8830 if ((HOST_WIDE_INT
) (((unsigned HOST_WIDE_INT
) off
)
8832 / BITS_PER_UNIT
== (HOST_WIDE_INT
) off
)
8834 bitpos0
= off
* BITS_PER_UNIT
;
8835 offset0
= NULL_TREE
;
8841 if (TREE_CODE (arg1
) == ADDR_EXPR
)
8843 base1
= get_inner_reference (TREE_OPERAND (arg1
, 0),
8844 &bitsize
, &bitpos1
, &offset1
, &mode
,
8845 &unsignedp
, &volatilep
, false);
8846 if (TREE_CODE (base1
) == INDIRECT_REF
)
8847 base1
= TREE_OPERAND (base1
, 0);
8849 indirect_base1
= true;
8851 else if (TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
8853 base1
= TREE_OPERAND (arg1
, 0);
8854 STRIP_SIGN_NOPS (base1
);
8855 if (TREE_CODE (base1
) == ADDR_EXPR
)
8857 base1
= TREE_OPERAND (base1
, 0);
8858 indirect_base1
= true;
8860 offset1
= TREE_OPERAND (arg1
, 1);
8861 if (tree_fits_shwi_p (offset1
))
8863 HOST_WIDE_INT off
= size_low_cst (offset1
);
8864 if ((HOST_WIDE_INT
) (((unsigned HOST_WIDE_INT
) off
)
8866 / BITS_PER_UNIT
== (HOST_WIDE_INT
) off
)
8868 bitpos1
= off
* BITS_PER_UNIT
;
8869 offset1
= NULL_TREE
;
8874 /* A local variable can never be pointed to by
8875 the default SSA name of an incoming parameter. */
8876 if ((TREE_CODE (arg0
) == ADDR_EXPR
8878 && TREE_CODE (base0
) == VAR_DECL
8879 && auto_var_in_fn_p (base0
, current_function_decl
)
8881 && TREE_CODE (base1
) == SSA_NAME
8882 && SSA_NAME_IS_DEFAULT_DEF (base1
)
8883 && TREE_CODE (SSA_NAME_VAR (base1
)) == PARM_DECL
)
8884 || (TREE_CODE (arg1
) == ADDR_EXPR
8886 && TREE_CODE (base1
) == VAR_DECL
8887 && auto_var_in_fn_p (base1
, current_function_decl
)
8889 && TREE_CODE (base0
) == SSA_NAME
8890 && SSA_NAME_IS_DEFAULT_DEF (base0
)
8891 && TREE_CODE (SSA_NAME_VAR (base0
)) == PARM_DECL
))
8893 if (code
== NE_EXPR
)
8894 return constant_boolean_node (1, type
);
8895 else if (code
== EQ_EXPR
)
8896 return constant_boolean_node (0, type
);
8898 /* If we have equivalent bases we might be able to simplify. */
8899 else if (indirect_base0
== indirect_base1
8900 && operand_equal_p (base0
, base1
, 0))
8902 /* We can fold this expression to a constant if the non-constant
8903 offset parts are equal. */
8904 if ((offset0
== offset1
8905 || (offset0
&& offset1
8906 && operand_equal_p (offset0
, offset1
, 0)))
8909 || (indirect_base0
&& DECL_P (base0
))
8910 || POINTER_TYPE_OVERFLOW_UNDEFINED
))
8914 && bitpos0
!= bitpos1
8915 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
8916 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
8917 fold_overflow_warning (("assuming pointer wraparound does not "
8918 "occur when comparing P +- C1 with "
8920 WARN_STRICT_OVERFLOW_CONDITIONAL
);
8925 return constant_boolean_node (bitpos0
== bitpos1
, type
);
8927 return constant_boolean_node (bitpos0
!= bitpos1
, type
);
8929 return constant_boolean_node (bitpos0
< bitpos1
, type
);
8931 return constant_boolean_node (bitpos0
<= bitpos1
, type
);
8933 return constant_boolean_node (bitpos0
>= bitpos1
, type
);
8935 return constant_boolean_node (bitpos0
> bitpos1
, type
);
8939 /* We can simplify the comparison to a comparison of the variable
8940 offset parts if the constant offset parts are equal.
8941 Be careful to use signed sizetype here because otherwise we
8942 mess with array offsets in the wrong way. This is possible
8943 because pointer arithmetic is restricted to retain within an
8944 object and overflow on pointer differences is undefined as of
8945 6.5.6/8 and /9 with respect to the signed ptrdiff_t. */
8946 else if (bitpos0
== bitpos1
8948 || (indirect_base0
&& DECL_P (base0
))
8949 || POINTER_TYPE_OVERFLOW_UNDEFINED
))
8951 /* By converting to signed sizetype we cover middle-end pointer
8952 arithmetic which operates on unsigned pointer types of size
8953 type size and ARRAY_REF offsets which are properly sign or
8954 zero extended from their type in case it is narrower than
8956 if (offset0
== NULL_TREE
)
8957 offset0
= build_int_cst (ssizetype
, 0);
8959 offset0
= fold_convert_loc (loc
, ssizetype
, offset0
);
8960 if (offset1
== NULL_TREE
)
8961 offset1
= build_int_cst (ssizetype
, 0);
8963 offset1
= fold_convert_loc (loc
, ssizetype
, offset1
);
8966 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
8967 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
8968 fold_overflow_warning (("assuming pointer wraparound does not "
8969 "occur when comparing P +- C1 with "
8971 WARN_STRICT_OVERFLOW_COMPARISON
);
8973 return fold_build2_loc (loc
, code
, type
, offset0
, offset1
);
8976 /* For non-equal bases we can simplify if they are addresses
8977 declarations with different addresses. */
8978 else if (indirect_base0
&& indirect_base1
8979 /* We know that !operand_equal_p (base0, base1, 0)
8980 because the if condition was false. But make
8981 sure two decls are not the same. */
8983 && TREE_CODE (arg0
) == ADDR_EXPR
8984 && TREE_CODE (arg1
) == ADDR_EXPR
8987 /* Watch for aliases. */
8988 && (!decl_in_symtab_p (base0
)
8989 || !decl_in_symtab_p (base1
)
8990 || !symtab_node::get_create (base0
)->equal_address_to
8991 (symtab_node::get_create (base1
))))
8993 if (code
== EQ_EXPR
)
8994 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
8996 else if (code
== NE_EXPR
)
8997 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
9000 /* For equal offsets we can simplify to a comparison of the
9002 else if (bitpos0
== bitpos1
9004 ? base0
!= TREE_OPERAND (arg0
, 0) : base0
!= arg0
)
9006 ? base1
!= TREE_OPERAND (arg1
, 0) : base1
!= arg1
)
9007 && ((offset0
== offset1
)
9008 || (offset0
&& offset1
9009 && operand_equal_p (offset0
, offset1
, 0))))
9012 base0
= build_fold_addr_expr_loc (loc
, base0
);
9014 base1
= build_fold_addr_expr_loc (loc
, base1
);
9015 return fold_build2_loc (loc
, code
, type
, base0
, base1
);
9019 /* Transform comparisons of the form X +- C1 CMP Y +- C2 to
9020 X CMP Y +- C2 +- C1 for signed X, Y. This is valid if
9021 the resulting offset is smaller in absolute value than the
9022 original one and has the same sign. */
9023 if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9024 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))
9025 && (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
9026 && (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
9027 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1)))
9028 && (TREE_CODE (arg1
) == PLUS_EXPR
|| TREE_CODE (arg1
) == MINUS_EXPR
)
9029 && (TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
9030 && !TREE_OVERFLOW (TREE_OPERAND (arg1
, 1))))
9032 tree const1
= TREE_OPERAND (arg0
, 1);
9033 tree const2
= TREE_OPERAND (arg1
, 1);
9034 tree variable1
= TREE_OPERAND (arg0
, 0);
9035 tree variable2
= TREE_OPERAND (arg1
, 0);
9037 const char * const warnmsg
= G_("assuming signed overflow does not "
9038 "occur when combining constants around "
9041 /* Put the constant on the side where it doesn't overflow and is
9042 of lower absolute value and of same sign than before. */
9043 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9044 ? MINUS_EXPR
: PLUS_EXPR
,
9046 if (!TREE_OVERFLOW (cst
)
9047 && tree_int_cst_compare (const2
, cst
) == tree_int_cst_sgn (const2
)
9048 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const2
))
9050 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9051 return fold_build2_loc (loc
, code
, type
,
9053 fold_build2_loc (loc
, TREE_CODE (arg1
),
9058 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9059 ? MINUS_EXPR
: PLUS_EXPR
,
9061 if (!TREE_OVERFLOW (cst
)
9062 && tree_int_cst_compare (const1
, cst
) == tree_int_cst_sgn (const1
)
9063 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const1
))
9065 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9066 return fold_build2_loc (loc
, code
, type
,
9067 fold_build2_loc (loc
, TREE_CODE (arg0
),
9074 tem
= maybe_canonicalize_comparison (loc
, code
, type
, arg0
, arg1
);
9078 if (FLOAT_TYPE_P (TREE_TYPE (arg0
)))
9080 tree targ0
= strip_float_extensions (arg0
);
9081 tree targ1
= strip_float_extensions (arg1
);
9082 tree newtype
= TREE_TYPE (targ0
);
9084 if (TYPE_PRECISION (TREE_TYPE (targ1
)) > TYPE_PRECISION (newtype
))
9085 newtype
= TREE_TYPE (targ1
);
9087 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
9088 if (TYPE_PRECISION (newtype
) < TYPE_PRECISION (TREE_TYPE (arg0
)))
9089 return fold_build2_loc (loc
, code
, type
,
9090 fold_convert_loc (loc
, newtype
, targ0
),
9091 fold_convert_loc (loc
, newtype
, targ1
));
9093 if (TREE_CODE (arg1
) == REAL_CST
)
9095 REAL_VALUE_TYPE cst
;
9096 cst
= TREE_REAL_CST (arg1
);
9098 /* IEEE doesn't distinguish +0 and -0 in comparisons. */
9099 /* a CMP (-0) -> a CMP 0 */
9100 if (REAL_VALUE_MINUS_ZERO (cst
))
9101 return fold_build2_loc (loc
, code
, type
, arg0
,
9102 build_real (TREE_TYPE (arg1
), dconst0
));
9104 /* x != NaN is always true, other ops are always false. */
9105 if (REAL_VALUE_ISNAN (cst
)
9106 && ! HONOR_SNANS (arg1
))
9108 tem
= (code
== NE_EXPR
) ? integer_one_node
: integer_zero_node
;
9109 return omit_one_operand_loc (loc
, type
, tem
, arg0
);
9112 /* Fold comparisons against infinity. */
9113 if (REAL_VALUE_ISINF (cst
)
9114 && MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1
))))
9116 tem
= fold_inf_compare (loc
, code
, type
, arg0
, arg1
);
9117 if (tem
!= NULL_TREE
)
9122 /* If this is a comparison of a real constant with a PLUS_EXPR
9123 or a MINUS_EXPR of a real constant, we can convert it into a
9124 comparison with a revised real constant as long as no overflow
9125 occurs when unsafe_math_optimizations are enabled. */
9126 if (flag_unsafe_math_optimizations
9127 && TREE_CODE (arg1
) == REAL_CST
9128 && (TREE_CODE (arg0
) == PLUS_EXPR
9129 || TREE_CODE (arg0
) == MINUS_EXPR
)
9130 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
9131 && 0 != (tem
= const_binop (TREE_CODE (arg0
) == PLUS_EXPR
9132 ? MINUS_EXPR
: PLUS_EXPR
,
9133 arg1
, TREE_OPERAND (arg0
, 1)))
9134 && !TREE_OVERFLOW (tem
))
9135 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), tem
);
9137 /* Likewise, we can simplify a comparison of a real constant with
9138 a MINUS_EXPR whose first operand is also a real constant, i.e.
9139 (c1 - x) < c2 becomes x > c1-c2. Reordering is allowed on
9140 floating-point types only if -fassociative-math is set. */
9141 if (flag_associative_math
9142 && TREE_CODE (arg1
) == REAL_CST
9143 && TREE_CODE (arg0
) == MINUS_EXPR
9144 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == REAL_CST
9145 && 0 != (tem
= const_binop (MINUS_EXPR
, TREE_OPERAND (arg0
, 0),
9147 && !TREE_OVERFLOW (tem
))
9148 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
,
9149 TREE_OPERAND (arg0
, 1), tem
);
9151 /* Fold comparisons against built-in math functions. */
9152 if (TREE_CODE (arg1
) == REAL_CST
9153 && flag_unsafe_math_optimizations
9154 && ! flag_errno_math
)
9156 enum built_in_function fcode
= builtin_mathfn_code (arg0
);
9158 if (fcode
!= END_BUILTINS
)
9160 tem
= fold_mathfn_compare (loc
, fcode
, code
, type
, arg0
, arg1
);
9161 if (tem
!= NULL_TREE
)
9167 if (TREE_CODE (TREE_TYPE (arg0
)) == INTEGER_TYPE
9168 && CONVERT_EXPR_P (arg0
))
9170 /* If we are widening one operand of an integer comparison,
9171 see if the other operand is similarly being widened. Perhaps we
9172 can do the comparison in the narrower type. */
9173 tem
= fold_widened_comparison (loc
, code
, type
, arg0
, arg1
);
9177 /* Or if we are changing signedness. */
9178 tem
= fold_sign_changed_comparison (loc
, code
, type
, arg0
, arg1
);
9183 /* If this is comparing a constant with a MIN_EXPR or a MAX_EXPR of a
9184 constant, we can simplify it. */
9185 if (TREE_CODE (arg1
) == INTEGER_CST
9186 && (TREE_CODE (arg0
) == MIN_EXPR
9187 || TREE_CODE (arg0
) == MAX_EXPR
)
9188 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
9190 tem
= optimize_minmax_comparison (loc
, code
, type
, op0
, op1
);
9195 /* If we are comparing an expression that just has comparisons
9196 of two integer values, arithmetic expressions of those comparisons,
9197 and constants, we can simplify it. There are only three cases
9198 to check: the two values can either be equal, the first can be
9199 greater, or the second can be greater. Fold the expression for
9200 those three values. Since each value must be 0 or 1, we have
9201 eight possibilities, each of which corresponds to the constant 0
9202 or 1 or one of the six possible comparisons.
9204 This handles common cases like (a > b) == 0 but also handles
9205 expressions like ((x > y) - (y > x)) > 0, which supposedly
9206 occur in macroized code. */
9208 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) != INTEGER_CST
)
9210 tree cval1
= 0, cval2
= 0;
9213 if (twoval_comparison_p (arg0
, &cval1
, &cval2
, &save_p
)
9214 /* Don't handle degenerate cases here; they should already
9215 have been handled anyway. */
9216 && cval1
!= 0 && cval2
!= 0
9217 && ! (TREE_CONSTANT (cval1
) && TREE_CONSTANT (cval2
))
9218 && TREE_TYPE (cval1
) == TREE_TYPE (cval2
)
9219 && INTEGRAL_TYPE_P (TREE_TYPE (cval1
))
9220 && TYPE_MAX_VALUE (TREE_TYPE (cval1
))
9221 && TYPE_MAX_VALUE (TREE_TYPE (cval2
))
9222 && ! operand_equal_p (TYPE_MIN_VALUE (TREE_TYPE (cval1
)),
9223 TYPE_MAX_VALUE (TREE_TYPE (cval2
)), 0))
9225 tree maxval
= TYPE_MAX_VALUE (TREE_TYPE (cval1
));
9226 tree minval
= TYPE_MIN_VALUE (TREE_TYPE (cval1
));
9228 /* We can't just pass T to eval_subst in case cval1 or cval2
9229 was the same as ARG1. */
9232 = fold_build2_loc (loc
, code
, type
,
9233 eval_subst (loc
, arg0
, cval1
, maxval
,
9237 = fold_build2_loc (loc
, code
, type
,
9238 eval_subst (loc
, arg0
, cval1
, maxval
,
9242 = fold_build2_loc (loc
, code
, type
,
9243 eval_subst (loc
, arg0
, cval1
, minval
,
9247 /* All three of these results should be 0 or 1. Confirm they are.
9248 Then use those values to select the proper code to use. */
9250 if (TREE_CODE (high_result
) == INTEGER_CST
9251 && TREE_CODE (equal_result
) == INTEGER_CST
9252 && TREE_CODE (low_result
) == INTEGER_CST
)
9254 /* Make a 3-bit mask with the high-order bit being the
9255 value for `>', the next for '=', and the low for '<'. */
9256 switch ((integer_onep (high_result
) * 4)
9257 + (integer_onep (equal_result
) * 2)
9258 + integer_onep (low_result
))
9262 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
9283 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
9288 tem
= save_expr (build2 (code
, type
, cval1
, cval2
));
9289 SET_EXPR_LOCATION (tem
, loc
);
9292 return fold_build2_loc (loc
, code
, type
, cval1
, cval2
);
9297 /* We can fold X/C1 op C2 where C1 and C2 are integer constants
9298 into a single range test. */
9299 if ((TREE_CODE (arg0
) == TRUNC_DIV_EXPR
9300 || TREE_CODE (arg0
) == EXACT_DIV_EXPR
)
9301 && TREE_CODE (arg1
) == INTEGER_CST
9302 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
9303 && !integer_zerop (TREE_OPERAND (arg0
, 1))
9304 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1))
9305 && !TREE_OVERFLOW (arg1
))
9307 tem
= fold_div_compare (loc
, code
, type
, arg0
, arg1
);
9308 if (tem
!= NULL_TREE
)
9316 /* Subroutine of fold_binary. Optimize complex multiplications of the
9317 form z * conj(z), as pow(realpart(z),2) + pow(imagpart(z),2). The
9318 argument EXPR represents the expression "z" of type TYPE. */
9321 fold_mult_zconjz (location_t loc
, tree type
, tree expr
)
9323 tree itype
= TREE_TYPE (type
);
9324 tree rpart
, ipart
, tem
;
9326 if (TREE_CODE (expr
) == COMPLEX_EXPR
)
9328 rpart
= TREE_OPERAND (expr
, 0);
9329 ipart
= TREE_OPERAND (expr
, 1);
9331 else if (TREE_CODE (expr
) == COMPLEX_CST
)
9333 rpart
= TREE_REALPART (expr
);
9334 ipart
= TREE_IMAGPART (expr
);
9338 expr
= save_expr (expr
);
9339 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, itype
, expr
);
9340 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, itype
, expr
);
9343 rpart
= save_expr (rpart
);
9344 ipart
= save_expr (ipart
);
9345 tem
= fold_build2_loc (loc
, PLUS_EXPR
, itype
,
9346 fold_build2_loc (loc
, MULT_EXPR
, itype
, rpart
, rpart
),
9347 fold_build2_loc (loc
, MULT_EXPR
, itype
, ipart
, ipart
));
9348 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, tem
,
9349 build_zero_cst (itype
));
9353 /* Helper function for fold_vec_perm. Store elements of VECTOR_CST or
9354 CONSTRUCTOR ARG into array ELTS and return true if successful. */
9357 vec_cst_ctor_to_array (tree arg
, tree
*elts
)
9359 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg
)), i
;
9361 if (TREE_CODE (arg
) == VECTOR_CST
)
9363 for (i
= 0; i
< VECTOR_CST_NELTS (arg
); ++i
)
9364 elts
[i
] = VECTOR_CST_ELT (arg
, i
);
9366 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
9368 constructor_elt
*elt
;
9370 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (arg
), i
, elt
)
9371 if (i
>= nelts
|| TREE_CODE (TREE_TYPE (elt
->value
)) == VECTOR_TYPE
)
9374 elts
[i
] = elt
->value
;
9378 for (; i
< nelts
; i
++)
9380 = fold_convert (TREE_TYPE (TREE_TYPE (arg
)), integer_zero_node
);
9384 /* Attempt to fold vector permutation of ARG0 and ARG1 vectors using SEL
9385 selector. Return the folded VECTOR_CST or CONSTRUCTOR if successful,
9386 NULL_TREE otherwise. */
9389 fold_vec_perm (tree type
, tree arg0
, tree arg1
, const unsigned char *sel
)
9391 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
9393 bool need_ctor
= false;
9395 gcc_assert (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)) == nelts
9396 && TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)) == nelts
);
9397 if (TREE_TYPE (TREE_TYPE (arg0
)) != TREE_TYPE (type
)
9398 || TREE_TYPE (TREE_TYPE (arg1
)) != TREE_TYPE (type
))
9401 elts
= XALLOCAVEC (tree
, nelts
* 3);
9402 if (!vec_cst_ctor_to_array (arg0
, elts
)
9403 || !vec_cst_ctor_to_array (arg1
, elts
+ nelts
))
9406 for (i
= 0; i
< nelts
; i
++)
9408 if (!CONSTANT_CLASS_P (elts
[sel
[i
]]))
9410 elts
[i
+ 2 * nelts
] = unshare_expr (elts
[sel
[i
]]);
9415 vec
<constructor_elt
, va_gc
> *v
;
9416 vec_alloc (v
, nelts
);
9417 for (i
= 0; i
< nelts
; i
++)
9418 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, elts
[2 * nelts
+ i
]);
9419 return build_constructor (type
, v
);
9422 return build_vector (type
, &elts
[2 * nelts
]);
9425 /* Try to fold a pointer difference of type TYPE two address expressions of
9426 array references AREF0 and AREF1 using location LOC. Return a
9427 simplified expression for the difference or NULL_TREE. */
9430 fold_addr_of_array_ref_difference (location_t loc
, tree type
,
9431 tree aref0
, tree aref1
)
9433 tree base0
= TREE_OPERAND (aref0
, 0);
9434 tree base1
= TREE_OPERAND (aref1
, 0);
9435 tree base_offset
= build_int_cst (type
, 0);
9437 /* If the bases are array references as well, recurse. If the bases
9438 are pointer indirections compute the difference of the pointers.
9439 If the bases are equal, we are set. */
9440 if ((TREE_CODE (base0
) == ARRAY_REF
9441 && TREE_CODE (base1
) == ARRAY_REF
9443 = fold_addr_of_array_ref_difference (loc
, type
, base0
, base1
)))
9444 || (INDIRECT_REF_P (base0
)
9445 && INDIRECT_REF_P (base1
)
9446 && (base_offset
= fold_binary_loc (loc
, MINUS_EXPR
, type
,
9447 TREE_OPERAND (base0
, 0),
9448 TREE_OPERAND (base1
, 0))))
9449 || operand_equal_p (base0
, base1
, 0))
9451 tree op0
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref0
, 1));
9452 tree op1
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref1
, 1));
9453 tree esz
= fold_convert_loc (loc
, type
, array_ref_element_size (aref0
));
9454 tree diff
= build2 (MINUS_EXPR
, type
, op0
, op1
);
9455 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
9457 fold_build2_loc (loc
, MULT_EXPR
, type
,
9463 /* If the real or vector real constant CST of type TYPE has an exact
9464 inverse, return it, else return NULL. */
9467 exact_inverse (tree type
, tree cst
)
9470 tree unit_type
, *elts
;
9472 unsigned vec_nelts
, i
;
9474 switch (TREE_CODE (cst
))
9477 r
= TREE_REAL_CST (cst
);
9479 if (exact_real_inverse (TYPE_MODE (type
), &r
))
9480 return build_real (type
, r
);
9485 vec_nelts
= VECTOR_CST_NELTS (cst
);
9486 elts
= XALLOCAVEC (tree
, vec_nelts
);
9487 unit_type
= TREE_TYPE (type
);
9488 mode
= TYPE_MODE (unit_type
);
9490 for (i
= 0; i
< vec_nelts
; i
++)
9492 r
= TREE_REAL_CST (VECTOR_CST_ELT (cst
, i
));
9493 if (!exact_real_inverse (mode
, &r
))
9495 elts
[i
] = build_real (unit_type
, r
);
9498 return build_vector (type
, elts
);
9505 /* Mask out the tz least significant bits of X of type TYPE where
9506 tz is the number of trailing zeroes in Y. */
9508 mask_with_tz (tree type
, const wide_int
&x
, const wide_int
&y
)
9510 int tz
= wi::ctz (y
);
9512 return wi::mask (tz
, true, TYPE_PRECISION (type
)) & x
;
9516 /* Return true when T is an address and is known to be nonzero.
9517 For floating point we further ensure that T is not denormal.
9518 Similar logic is present in nonzero_address in rtlanal.h.
9520 If the return value is based on the assumption that signed overflow
9521 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
9522 change *STRICT_OVERFLOW_P. */
9525 tree_expr_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
9527 tree type
= TREE_TYPE (t
);
9528 enum tree_code code
;
9530 /* Doing something useful for floating point would need more work. */
9531 if (!INTEGRAL_TYPE_P (type
) && !POINTER_TYPE_P (type
))
9534 code
= TREE_CODE (t
);
9535 switch (TREE_CODE_CLASS (code
))
9538 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9541 case tcc_comparison
:
9542 return tree_binary_nonzero_warnv_p (code
, type
,
9543 TREE_OPERAND (t
, 0),
9544 TREE_OPERAND (t
, 1),
9547 case tcc_declaration
:
9549 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
9557 case TRUTH_NOT_EXPR
:
9558 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9561 case TRUTH_AND_EXPR
:
9563 case TRUTH_XOR_EXPR
:
9564 return tree_binary_nonzero_warnv_p (code
, type
,
9565 TREE_OPERAND (t
, 0),
9566 TREE_OPERAND (t
, 1),
9574 case WITH_SIZE_EXPR
:
9576 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
9581 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
9585 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 0),
9590 tree fndecl
= get_callee_fndecl (t
);
9591 if (!fndecl
) return false;
9592 if (flag_delete_null_pointer_checks
&& !flag_check_new
9593 && DECL_IS_OPERATOR_NEW (fndecl
)
9594 && !TREE_NOTHROW (fndecl
))
9596 if (flag_delete_null_pointer_checks
9597 && lookup_attribute ("returns_nonnull",
9598 TYPE_ATTRIBUTES (TREE_TYPE (fndecl
))))
9600 return alloca_call_p (t
);
9609 /* Return true when T is an address and is known to be nonzero.
9610 Handle warnings about undefined signed overflow. */
9613 tree_expr_nonzero_p (tree t
)
9615 bool ret
, strict_overflow_p
;
9617 strict_overflow_p
= false;
9618 ret
= tree_expr_nonzero_warnv_p (t
, &strict_overflow_p
);
9619 if (strict_overflow_p
)
9620 fold_overflow_warning (("assuming signed overflow does not occur when "
9621 "determining that expression is always "
9623 WARN_STRICT_OVERFLOW_MISC
);
9627 /* Fold a binary expression of code CODE and type TYPE with operands
9628 OP0 and OP1. LOC is the location of the resulting expression.
9629 Return the folded expression if folding is successful. Otherwise,
9630 return NULL_TREE. */
9633 fold_binary_loc (location_t loc
,
9634 enum tree_code code
, tree type
, tree op0
, tree op1
)
9636 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
9637 tree arg0
, arg1
, tem
;
9638 tree t1
= NULL_TREE
;
9639 bool strict_overflow_p
;
9642 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
9643 && TREE_CODE_LENGTH (code
) == 2
9645 && op1
!= NULL_TREE
);
9650 /* Strip any conversions that don't change the mode. This is
9651 safe for every expression, except for a comparison expression
9652 because its signedness is derived from its operands. So, in
9653 the latter case, only strip conversions that don't change the
9654 signedness. MIN_EXPR/MAX_EXPR also need signedness of arguments
9657 Note that this is done as an internal manipulation within the
9658 constant folder, in order to find the simplest representation
9659 of the arguments so that their form can be studied. In any
9660 cases, the appropriate type conversions should be put back in
9661 the tree that will get out of the constant folder. */
9663 if (kind
== tcc_comparison
|| code
== MIN_EXPR
|| code
== MAX_EXPR
)
9665 STRIP_SIGN_NOPS (arg0
);
9666 STRIP_SIGN_NOPS (arg1
);
9674 /* Note that TREE_CONSTANT isn't enough: static var addresses are
9675 constant but we can't do arithmetic on them. */
9676 if (CONSTANT_CLASS_P (arg0
) && CONSTANT_CLASS_P (arg1
))
9678 tem
= const_binop (code
, type
, arg0
, arg1
);
9679 if (tem
!= NULL_TREE
)
9681 if (TREE_TYPE (tem
) != type
)
9682 tem
= fold_convert_loc (loc
, type
, tem
);
9687 /* If this is a commutative operation, and ARG0 is a constant, move it
9688 to ARG1 to reduce the number of tests below. */
9689 if (commutative_tree_code (code
)
9690 && tree_swap_operands_p (arg0
, arg1
, true))
9691 return fold_build2_loc (loc
, code
, type
, op1
, op0
);
9693 /* Likewise if this is a comparison, and ARG0 is a constant, move it
9694 to ARG1 to reduce the number of tests below. */
9695 if (kind
== tcc_comparison
9696 && tree_swap_operands_p (arg0
, arg1
, true))
9697 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
, op1
, op0
);
9699 tem
= generic_simplify (loc
, code
, type
, op0
, op1
);
9703 /* ARG0 is the first operand of EXPR, and ARG1 is the second operand.
9705 First check for cases where an arithmetic operation is applied to a
9706 compound, conditional, or comparison operation. Push the arithmetic
9707 operation inside the compound or conditional to see if any folding
9708 can then be done. Convert comparison to conditional for this purpose.
9709 The also optimizes non-constant cases that used to be done in
9712 Before we do that, see if this is a BIT_AND_EXPR or a BIT_IOR_EXPR,
9713 one of the operands is a comparison and the other is a comparison, a
9714 BIT_AND_EXPR with the constant 1, or a truth value. In that case, the
9715 code below would make the expression more complex. Change it to a
9716 TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to
9717 TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */
9719 if ((code
== BIT_AND_EXPR
|| code
== BIT_IOR_EXPR
9720 || code
== EQ_EXPR
|| code
== NE_EXPR
)
9721 && TREE_CODE (type
) != VECTOR_TYPE
9722 && ((truth_value_p (TREE_CODE (arg0
))
9723 && (truth_value_p (TREE_CODE (arg1
))
9724 || (TREE_CODE (arg1
) == BIT_AND_EXPR
9725 && integer_onep (TREE_OPERAND (arg1
, 1)))))
9726 || (truth_value_p (TREE_CODE (arg1
))
9727 && (truth_value_p (TREE_CODE (arg0
))
9728 || (TREE_CODE (arg0
) == BIT_AND_EXPR
9729 && integer_onep (TREE_OPERAND (arg0
, 1)))))))
9731 tem
= fold_build2_loc (loc
, code
== BIT_AND_EXPR
? TRUTH_AND_EXPR
9732 : code
== BIT_IOR_EXPR
? TRUTH_OR_EXPR
9735 fold_convert_loc (loc
, boolean_type_node
, arg0
),
9736 fold_convert_loc (loc
, boolean_type_node
, arg1
));
9738 if (code
== EQ_EXPR
)
9739 tem
= invert_truthvalue_loc (loc
, tem
);
9741 return fold_convert_loc (loc
, type
, tem
);
9744 if (TREE_CODE_CLASS (code
) == tcc_binary
9745 || TREE_CODE_CLASS (code
) == tcc_comparison
)
9747 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
9749 tem
= fold_build2_loc (loc
, code
, type
,
9750 fold_convert_loc (loc
, TREE_TYPE (op0
),
9751 TREE_OPERAND (arg0
, 1)), op1
);
9752 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
9755 if (TREE_CODE (arg1
) == COMPOUND_EXPR
9756 && reorder_operands_p (arg0
, TREE_OPERAND (arg1
, 0)))
9758 tem
= fold_build2_loc (loc
, code
, type
, op0
,
9759 fold_convert_loc (loc
, TREE_TYPE (op1
),
9760 TREE_OPERAND (arg1
, 1)));
9761 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg1
, 0),
9765 if (TREE_CODE (arg0
) == COND_EXPR
9766 || TREE_CODE (arg0
) == VEC_COND_EXPR
9767 || COMPARISON_CLASS_P (arg0
))
9769 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
9771 /*cond_first_p=*/1);
9772 if (tem
!= NULL_TREE
)
9776 if (TREE_CODE (arg1
) == COND_EXPR
9777 || TREE_CODE (arg1
) == VEC_COND_EXPR
9778 || COMPARISON_CLASS_P (arg1
))
9780 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
9782 /*cond_first_p=*/0);
9783 if (tem
!= NULL_TREE
)
9791 /* MEM[&MEM[p, CST1], CST2] -> MEM[p, CST1 + CST2]. */
9792 if (TREE_CODE (arg0
) == ADDR_EXPR
9793 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == MEM_REF
)
9795 tree iref
= TREE_OPERAND (arg0
, 0);
9796 return fold_build2 (MEM_REF
, type
,
9797 TREE_OPERAND (iref
, 0),
9798 int_const_binop (PLUS_EXPR
, arg1
,
9799 TREE_OPERAND (iref
, 1)));
9802 /* MEM[&a.b, CST2] -> MEM[&a, offsetof (a, b) + CST2]. */
9803 if (TREE_CODE (arg0
) == ADDR_EXPR
9804 && handled_component_p (TREE_OPERAND (arg0
, 0)))
9807 HOST_WIDE_INT coffset
;
9808 base
= get_addr_base_and_unit_offset (TREE_OPERAND (arg0
, 0),
9812 return fold_build2 (MEM_REF
, type
,
9813 build_fold_addr_expr (base
),
9814 int_const_binop (PLUS_EXPR
, arg1
,
9815 size_int (coffset
)));
9820 case POINTER_PLUS_EXPR
:
9821 /* INT +p INT -> (PTR)(INT + INT). Stripping types allows for this. */
9822 if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
9823 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
)))
9824 return fold_convert_loc (loc
, type
,
9825 fold_build2_loc (loc
, PLUS_EXPR
, sizetype
,
9826 fold_convert_loc (loc
, sizetype
,
9828 fold_convert_loc (loc
, sizetype
,
9834 if (INTEGRAL_TYPE_P (type
) || VECTOR_INTEGER_TYPE_P (type
))
9836 /* X + (X / CST) * -CST is X % CST. */
9837 if (TREE_CODE (arg1
) == MULT_EXPR
9838 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == TRUNC_DIV_EXPR
9839 && operand_equal_p (arg0
,
9840 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0), 0))
9842 tree cst0
= TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1);
9843 tree cst1
= TREE_OPERAND (arg1
, 1);
9844 tree sum
= fold_binary_loc (loc
, PLUS_EXPR
, TREE_TYPE (cst1
),
9846 if (sum
&& integer_zerop (sum
))
9847 return fold_convert_loc (loc
, type
,
9848 fold_build2_loc (loc
, TRUNC_MOD_EXPR
,
9849 TREE_TYPE (arg0
), arg0
,
9854 /* Handle (A1 * C1) + (A2 * C2) with A1, A2 or C1, C2 being the same or
9855 one. Make sure the type is not saturating and has the signedness of
9856 the stripped operands, as fold_plusminus_mult_expr will re-associate.
9857 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
9858 if ((TREE_CODE (arg0
) == MULT_EXPR
9859 || TREE_CODE (arg1
) == MULT_EXPR
)
9860 && !TYPE_SATURATING (type
)
9861 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
9862 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
9863 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
9865 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
9870 if (! FLOAT_TYPE_P (type
))
9872 /* If we are adding two BIT_AND_EXPR's, both of which are and'ing
9873 with a constant, and the two constants have no bits in common,
9874 we should treat this as a BIT_IOR_EXPR since this may produce more
9876 if (TREE_CODE (arg0
) == BIT_AND_EXPR
9877 && TREE_CODE (arg1
) == BIT_AND_EXPR
9878 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
9879 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
9880 && wi::bit_and (TREE_OPERAND (arg0
, 1),
9881 TREE_OPERAND (arg1
, 1)) == 0)
9883 code
= BIT_IOR_EXPR
;
9887 /* Reassociate (plus (plus (mult) (foo)) (mult)) as
9888 (plus (plus (mult) (mult)) (foo)) so that we can
9889 take advantage of the factoring cases below. */
9890 if (ANY_INTEGRAL_TYPE_P (type
)
9891 && TYPE_OVERFLOW_WRAPS (type
)
9892 && (((TREE_CODE (arg0
) == PLUS_EXPR
9893 || TREE_CODE (arg0
) == MINUS_EXPR
)
9894 && TREE_CODE (arg1
) == MULT_EXPR
)
9895 || ((TREE_CODE (arg1
) == PLUS_EXPR
9896 || TREE_CODE (arg1
) == MINUS_EXPR
)
9897 && TREE_CODE (arg0
) == MULT_EXPR
)))
9899 tree parg0
, parg1
, parg
, marg
;
9900 enum tree_code pcode
;
9902 if (TREE_CODE (arg1
) == MULT_EXPR
)
9903 parg
= arg0
, marg
= arg1
;
9905 parg
= arg1
, marg
= arg0
;
9906 pcode
= TREE_CODE (parg
);
9907 parg0
= TREE_OPERAND (parg
, 0);
9908 parg1
= TREE_OPERAND (parg
, 1);
9912 if (TREE_CODE (parg0
) == MULT_EXPR
9913 && TREE_CODE (parg1
) != MULT_EXPR
)
9914 return fold_build2_loc (loc
, pcode
, type
,
9915 fold_build2_loc (loc
, PLUS_EXPR
, type
,
9916 fold_convert_loc (loc
, type
,
9918 fold_convert_loc (loc
, type
,
9920 fold_convert_loc (loc
, type
, parg1
));
9921 if (TREE_CODE (parg0
) != MULT_EXPR
9922 && TREE_CODE (parg1
) == MULT_EXPR
)
9924 fold_build2_loc (loc
, PLUS_EXPR
, type
,
9925 fold_convert_loc (loc
, type
, parg0
),
9926 fold_build2_loc (loc
, pcode
, type
,
9927 fold_convert_loc (loc
, type
, marg
),
9928 fold_convert_loc (loc
, type
,
9934 /* Fold __complex__ ( x, 0 ) + __complex__ ( 0, y )
9935 to __complex__ ( x, y ). This is not the same for SNaNs or
9936 if signed zeros are involved. */
9937 if (!HONOR_SNANS (element_mode (arg0
))
9938 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
9939 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
9941 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
9942 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
9943 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
9944 bool arg0rz
= false, arg0iz
= false;
9945 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
9946 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
9948 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
9949 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
9950 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
9952 tree rp
= arg1r
? arg1r
9953 : build1 (REALPART_EXPR
, rtype
, arg1
);
9954 tree ip
= arg0i
? arg0i
9955 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
9956 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9958 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
9960 tree rp
= arg0r
? arg0r
9961 : build1 (REALPART_EXPR
, rtype
, arg0
);
9962 tree ip
= arg1i
? arg1i
9963 : build1 (IMAGPART_EXPR
, rtype
, arg1
);
9964 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
9969 if (flag_unsafe_math_optimizations
9970 && (TREE_CODE (arg0
) == RDIV_EXPR
|| TREE_CODE (arg0
) == MULT_EXPR
)
9971 && (TREE_CODE (arg1
) == RDIV_EXPR
|| TREE_CODE (arg1
) == MULT_EXPR
)
9972 && (tem
= distribute_real_division (loc
, code
, type
, arg0
, arg1
)))
9975 /* Convert a + (b*c + d*e) into (a + b*c) + d*e.
9976 We associate floats only if the user has specified
9977 -fassociative-math. */
9978 if (flag_associative_math
9979 && TREE_CODE (arg1
) == PLUS_EXPR
9980 && TREE_CODE (arg0
) != MULT_EXPR
)
9982 tree tree10
= TREE_OPERAND (arg1
, 0);
9983 tree tree11
= TREE_OPERAND (arg1
, 1);
9984 if (TREE_CODE (tree11
) == MULT_EXPR
9985 && TREE_CODE (tree10
) == MULT_EXPR
)
9988 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, arg0
, tree10
);
9989 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree0
, tree11
);
9992 /* Convert (b*c + d*e) + a into b*c + (d*e +a).
9993 We associate floats only if the user has specified
9994 -fassociative-math. */
9995 if (flag_associative_math
9996 && TREE_CODE (arg0
) == PLUS_EXPR
9997 && TREE_CODE (arg1
) != MULT_EXPR
)
9999 tree tree00
= TREE_OPERAND (arg0
, 0);
10000 tree tree01
= TREE_OPERAND (arg0
, 1);
10001 if (TREE_CODE (tree01
) == MULT_EXPR
10002 && TREE_CODE (tree00
) == MULT_EXPR
)
10005 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, tree01
, arg1
);
10006 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree00
, tree0
);
10012 /* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A
10013 is a rotate of A by C1 bits. */
10014 /* (A << B) + (A >> (Z - B)) if A is unsigned and Z is the size of A
10015 is a rotate of A by B bits. */
10017 enum tree_code code0
, code1
;
10019 code0
= TREE_CODE (arg0
);
10020 code1
= TREE_CODE (arg1
);
10021 if (((code0
== RSHIFT_EXPR
&& code1
== LSHIFT_EXPR
)
10022 || (code1
== RSHIFT_EXPR
&& code0
== LSHIFT_EXPR
))
10023 && operand_equal_p (TREE_OPERAND (arg0
, 0),
10024 TREE_OPERAND (arg1
, 0), 0)
10025 && (rtype
= TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10026 TYPE_UNSIGNED (rtype
))
10027 /* Only create rotates in complete modes. Other cases are not
10028 expanded properly. */
10029 && (element_precision (rtype
)
10030 == element_precision (TYPE_MODE (rtype
))))
10032 tree tree01
, tree11
;
10033 enum tree_code code01
, code11
;
10035 tree01
= TREE_OPERAND (arg0
, 1);
10036 tree11
= TREE_OPERAND (arg1
, 1);
10037 STRIP_NOPS (tree01
);
10038 STRIP_NOPS (tree11
);
10039 code01
= TREE_CODE (tree01
);
10040 code11
= TREE_CODE (tree11
);
10041 if (code01
== INTEGER_CST
10042 && code11
== INTEGER_CST
10043 && (wi::to_widest (tree01
) + wi::to_widest (tree11
)
10044 == element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)))))
10046 tem
= build2_loc (loc
, LROTATE_EXPR
,
10047 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10048 TREE_OPERAND (arg0
, 0),
10049 code0
== LSHIFT_EXPR
10050 ? TREE_OPERAND (arg0
, 1)
10051 : TREE_OPERAND (arg1
, 1));
10052 return fold_convert_loc (loc
, type
, tem
);
10054 else if (code11
== MINUS_EXPR
)
10056 tree tree110
, tree111
;
10057 tree110
= TREE_OPERAND (tree11
, 0);
10058 tree111
= TREE_OPERAND (tree11
, 1);
10059 STRIP_NOPS (tree110
);
10060 STRIP_NOPS (tree111
);
10061 if (TREE_CODE (tree110
) == INTEGER_CST
10062 && 0 == compare_tree_int (tree110
,
10064 (TREE_TYPE (TREE_OPERAND
10066 && operand_equal_p (tree01
, tree111
, 0))
10068 fold_convert_loc (loc
, type
,
10069 build2 ((code0
== LSHIFT_EXPR
10072 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10073 TREE_OPERAND (arg0
, 0),
10074 TREE_OPERAND (arg0
, 1)));
10076 else if (code01
== MINUS_EXPR
)
10078 tree tree010
, tree011
;
10079 tree010
= TREE_OPERAND (tree01
, 0);
10080 tree011
= TREE_OPERAND (tree01
, 1);
10081 STRIP_NOPS (tree010
);
10082 STRIP_NOPS (tree011
);
10083 if (TREE_CODE (tree010
) == INTEGER_CST
10084 && 0 == compare_tree_int (tree010
,
10086 (TREE_TYPE (TREE_OPERAND
10088 && operand_equal_p (tree11
, tree011
, 0))
10089 return fold_convert_loc
10091 build2 ((code0
!= LSHIFT_EXPR
10094 TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10095 TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 1)));
10101 /* In most languages, can't associate operations on floats through
10102 parentheses. Rather than remember where the parentheses were, we
10103 don't associate floats at all, unless the user has specified
10104 -fassociative-math.
10105 And, we need to make sure type is not saturating. */
10107 if ((! FLOAT_TYPE_P (type
) || flag_associative_math
)
10108 && !TYPE_SATURATING (type
))
10110 tree var0
, con0
, lit0
, minus_lit0
;
10111 tree var1
, con1
, lit1
, minus_lit1
;
10115 /* Split both trees into variables, constants, and literals. Then
10116 associate each group together, the constants with literals,
10117 then the result with variables. This increases the chances of
10118 literals being recombined later and of generating relocatable
10119 expressions for the sum of a constant and literal. */
10120 var0
= split_tree (arg0
, code
, &con0
, &lit0
, &minus_lit0
, 0);
10121 var1
= split_tree (arg1
, code
, &con1
, &lit1
, &minus_lit1
,
10122 code
== MINUS_EXPR
);
10124 /* Recombine MINUS_EXPR operands by using PLUS_EXPR. */
10125 if (code
== MINUS_EXPR
)
10128 /* With undefined overflow prefer doing association in a type
10129 which wraps on overflow, if that is one of the operand types. */
10130 if ((POINTER_TYPE_P (type
) && POINTER_TYPE_OVERFLOW_UNDEFINED
)
10131 || (INTEGRAL_TYPE_P (type
) && !TYPE_OVERFLOW_WRAPS (type
)))
10133 if (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10134 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
10135 atype
= TREE_TYPE (arg0
);
10136 else if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10137 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1
)))
10138 atype
= TREE_TYPE (arg1
);
10139 gcc_assert (TYPE_PRECISION (atype
) == TYPE_PRECISION (type
));
10142 /* With undefined overflow we can only associate constants with one
10143 variable, and constants whose association doesn't overflow. */
10144 if ((POINTER_TYPE_P (atype
) && POINTER_TYPE_OVERFLOW_UNDEFINED
)
10145 || (INTEGRAL_TYPE_P (atype
) && !TYPE_OVERFLOW_WRAPS (atype
)))
10152 if (TREE_CODE (tmp0
) == NEGATE_EXPR
)
10153 tmp0
= TREE_OPERAND (tmp0
, 0);
10154 if (CONVERT_EXPR_P (tmp0
)
10155 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10156 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10157 <= TYPE_PRECISION (atype
)))
10158 tmp0
= TREE_OPERAND (tmp0
, 0);
10159 if (TREE_CODE (tmp1
) == NEGATE_EXPR
)
10160 tmp1
= TREE_OPERAND (tmp1
, 0);
10161 if (CONVERT_EXPR_P (tmp1
)
10162 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10163 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10164 <= TYPE_PRECISION (atype
)))
10165 tmp1
= TREE_OPERAND (tmp1
, 0);
10166 /* The only case we can still associate with two variables
10167 is if they are the same, modulo negation and bit-pattern
10168 preserving conversions. */
10169 if (!operand_equal_p (tmp0
, tmp1
, 0))
10174 /* Only do something if we found more than two objects. Otherwise,
10175 nothing has changed and we risk infinite recursion. */
10177 && (2 < ((var0
!= 0) + (var1
!= 0)
10178 + (con0
!= 0) + (con1
!= 0)
10179 + (lit0
!= 0) + (lit1
!= 0)
10180 + (minus_lit0
!= 0) + (minus_lit1
!= 0))))
10182 bool any_overflows
= false;
10183 if (lit0
) any_overflows
|= TREE_OVERFLOW (lit0
);
10184 if (lit1
) any_overflows
|= TREE_OVERFLOW (lit1
);
10185 if (minus_lit0
) any_overflows
|= TREE_OVERFLOW (minus_lit0
);
10186 if (minus_lit1
) any_overflows
|= TREE_OVERFLOW (minus_lit1
);
10187 var0
= associate_trees (loc
, var0
, var1
, code
, atype
);
10188 con0
= associate_trees (loc
, con0
, con1
, code
, atype
);
10189 lit0
= associate_trees (loc
, lit0
, lit1
, code
, atype
);
10190 minus_lit0
= associate_trees (loc
, minus_lit0
, minus_lit1
,
10193 /* Preserve the MINUS_EXPR if the negative part of the literal is
10194 greater than the positive part. Otherwise, the multiplicative
10195 folding code (i.e extract_muldiv) may be fooled in case
10196 unsigned constants are subtracted, like in the following
10197 example: ((X*2 + 4) - 8U)/2. */
10198 if (minus_lit0
&& lit0
)
10200 if (TREE_CODE (lit0
) == INTEGER_CST
10201 && TREE_CODE (minus_lit0
) == INTEGER_CST
10202 && tree_int_cst_lt (lit0
, minus_lit0
))
10204 minus_lit0
= associate_trees (loc
, minus_lit0
, lit0
,
10205 MINUS_EXPR
, atype
);
10210 lit0
= associate_trees (loc
, lit0
, minus_lit0
,
10211 MINUS_EXPR
, atype
);
10216 /* Don't introduce overflows through reassociation. */
10218 && ((lit0
&& TREE_OVERFLOW_P (lit0
))
10219 || (minus_lit0
&& TREE_OVERFLOW_P (minus_lit0
))))
10226 fold_convert_loc (loc
, type
,
10227 associate_trees (loc
, var0
, minus_lit0
,
10228 MINUS_EXPR
, atype
));
10231 con0
= associate_trees (loc
, con0
, minus_lit0
,
10232 MINUS_EXPR
, atype
);
10234 fold_convert_loc (loc
, type
,
10235 associate_trees (loc
, var0
, con0
,
10236 PLUS_EXPR
, atype
));
10240 con0
= associate_trees (loc
, con0
, lit0
, code
, atype
);
10242 fold_convert_loc (loc
, type
, associate_trees (loc
, var0
, con0
,
10250 /* Pointer simplifications for subtraction, simple reassociations. */
10251 if (POINTER_TYPE_P (TREE_TYPE (arg1
)) && POINTER_TYPE_P (TREE_TYPE (arg0
)))
10253 /* (PTR0 p+ A) - (PTR1 p+ B) -> (PTR0 - PTR1) + (A - B) */
10254 if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
10255 && TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
10257 tree arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10258 tree arg01
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10259 tree arg10
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
10260 tree arg11
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
10261 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
10262 fold_build2_loc (loc
, MINUS_EXPR
, type
,
10264 fold_build2_loc (loc
, MINUS_EXPR
, type
,
10267 /* (PTR0 p+ A) - PTR1 -> (PTR0 - PTR1) + A, assuming PTR0 - PTR1 simplifies. */
10268 else if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
)
10270 tree arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10271 tree arg01
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10272 tree tmp
= fold_binary_loc (loc
, MINUS_EXPR
, type
, arg00
,
10273 fold_convert_loc (loc
, type
, arg1
));
10275 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tmp
, arg01
);
10277 /* PTR0 - (PTR1 p+ A) -> (PTR0 - PTR1) - A, assuming PTR0 - PTR1
10279 else if (TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
10281 tree arg10
= fold_convert_loc (loc
, type
,
10282 TREE_OPERAND (arg1
, 0));
10283 tree arg11
= fold_convert_loc (loc
, type
,
10284 TREE_OPERAND (arg1
, 1));
10285 tree tmp
= fold_binary_loc (loc
, MINUS_EXPR
, type
,
10286 fold_convert_loc (loc
, type
, arg0
),
10289 return fold_build2_loc (loc
, MINUS_EXPR
, type
, tmp
, arg11
);
10292 /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */
10293 if (TREE_CODE (arg0
) == NEGATE_EXPR
10294 && negate_expr_p (arg1
)
10295 && reorder_operands_p (arg0
, arg1
))
10296 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
10297 fold_convert_loc (loc
, type
,
10298 negate_expr (arg1
)),
10299 fold_convert_loc (loc
, type
,
10300 TREE_OPERAND (arg0
, 0)));
10302 if (! FLOAT_TYPE_P (type
))
10304 /* Fold A - (A & B) into ~B & A. */
10305 if (!TREE_SIDE_EFFECTS (arg0
)
10306 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
10308 if (operand_equal_p (arg0
, TREE_OPERAND (arg1
, 1), 0))
10310 tree arg10
= fold_convert_loc (loc
, type
,
10311 TREE_OPERAND (arg1
, 0));
10312 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10313 fold_build1_loc (loc
, BIT_NOT_EXPR
,
10315 fold_convert_loc (loc
, type
, arg0
));
10317 if (operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10319 tree arg11
= fold_convert_loc (loc
,
10320 type
, TREE_OPERAND (arg1
, 1));
10321 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10322 fold_build1_loc (loc
, BIT_NOT_EXPR
,
10324 fold_convert_loc (loc
, type
, arg0
));
10328 /* Fold (A & ~B) - (A & B) into (A ^ B) - B, where B is
10329 any power of 2 minus 1. */
10330 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10331 && TREE_CODE (arg1
) == BIT_AND_EXPR
10332 && operand_equal_p (TREE_OPERAND (arg0
, 0),
10333 TREE_OPERAND (arg1
, 0), 0))
10335 tree mask0
= TREE_OPERAND (arg0
, 1);
10336 tree mask1
= TREE_OPERAND (arg1
, 1);
10337 tree tem
= fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, mask0
);
10339 if (operand_equal_p (tem
, mask1
, 0))
10341 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, type
,
10342 TREE_OPERAND (arg0
, 0), mask1
);
10343 return fold_build2_loc (loc
, MINUS_EXPR
, type
, tem
, mask1
);
10348 /* Fold __complex__ ( x, 0 ) - __complex__ ( 0, y ) to
10349 __complex__ ( x, -y ). This is not the same for SNaNs or if
10350 signed zeros are involved. */
10351 if (!HONOR_SNANS (element_mode (arg0
))
10352 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10353 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
10355 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10356 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
10357 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
10358 bool arg0rz
= false, arg0iz
= false;
10359 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
10360 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
10362 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
10363 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
10364 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
10366 tree rp
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10368 : build1 (REALPART_EXPR
, rtype
, arg1
));
10369 tree ip
= arg0i
? arg0i
10370 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
10371 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10373 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
10375 tree rp
= arg0r
? arg0r
10376 : build1 (REALPART_EXPR
, rtype
, arg0
);
10377 tree ip
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10379 : build1 (IMAGPART_EXPR
, rtype
, arg1
));
10380 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10385 /* A - B -> A + (-B) if B is easily negatable. */
10386 if (negate_expr_p (arg1
)
10387 && !TYPE_OVERFLOW_SANITIZED (type
)
10388 && ((FLOAT_TYPE_P (type
)
10389 /* Avoid this transformation if B is a positive REAL_CST. */
10390 && (TREE_CODE (arg1
) != REAL_CST
10391 || REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1
))))
10392 || INTEGRAL_TYPE_P (type
)))
10393 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
10394 fold_convert_loc (loc
, type
, arg0
),
10395 fold_convert_loc (loc
, type
,
10396 negate_expr (arg1
)));
10398 /* Fold &a[i] - &a[j] to i-j. */
10399 if (TREE_CODE (arg0
) == ADDR_EXPR
10400 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ARRAY_REF
10401 && TREE_CODE (arg1
) == ADDR_EXPR
10402 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ARRAY_REF
)
10404 tree tem
= fold_addr_of_array_ref_difference (loc
, type
,
10405 TREE_OPERAND (arg0
, 0),
10406 TREE_OPERAND (arg1
, 0));
10411 if (FLOAT_TYPE_P (type
)
10412 && flag_unsafe_math_optimizations
10413 && (TREE_CODE (arg0
) == RDIV_EXPR
|| TREE_CODE (arg0
) == MULT_EXPR
)
10414 && (TREE_CODE (arg1
) == RDIV_EXPR
|| TREE_CODE (arg1
) == MULT_EXPR
)
10415 && (tem
= distribute_real_division (loc
, code
, type
, arg0
, arg1
)))
10418 /* Handle (A1 * C1) - (A2 * C2) with A1, A2 or C1, C2 being the same or
10419 one. Make sure the type is not saturating and has the signedness of
10420 the stripped operands, as fold_plusminus_mult_expr will re-associate.
10421 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
10422 if ((TREE_CODE (arg0
) == MULT_EXPR
10423 || TREE_CODE (arg1
) == MULT_EXPR
)
10424 && !TYPE_SATURATING (type
)
10425 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
10426 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
10427 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
10429 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
10437 /* (-A) * (-B) -> A * B */
10438 if (TREE_CODE (arg0
) == NEGATE_EXPR
&& negate_expr_p (arg1
))
10439 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10440 fold_convert_loc (loc
, type
,
10441 TREE_OPERAND (arg0
, 0)),
10442 fold_convert_loc (loc
, type
,
10443 negate_expr (arg1
)));
10444 if (TREE_CODE (arg1
) == NEGATE_EXPR
&& negate_expr_p (arg0
))
10445 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10446 fold_convert_loc (loc
, type
,
10447 negate_expr (arg0
)),
10448 fold_convert_loc (loc
, type
,
10449 TREE_OPERAND (arg1
, 0)));
10451 if (! FLOAT_TYPE_P (type
))
10453 /* Transform x * -C into -x * C if x is easily negatable. */
10454 if (TREE_CODE (arg1
) == INTEGER_CST
10455 && tree_int_cst_sgn (arg1
) == -1
10456 && negate_expr_p (arg0
)
10457 && (tem
= negate_expr (arg1
)) != arg1
10458 && !TREE_OVERFLOW (tem
))
10459 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10460 fold_convert_loc (loc
, type
,
10461 negate_expr (arg0
)),
10464 /* (a * (1 << b)) is (a << b) */
10465 if (TREE_CODE (arg1
) == LSHIFT_EXPR
10466 && integer_onep (TREE_OPERAND (arg1
, 0)))
10467 return fold_build2_loc (loc
, LSHIFT_EXPR
, type
, op0
,
10468 TREE_OPERAND (arg1
, 1));
10469 if (TREE_CODE (arg0
) == LSHIFT_EXPR
10470 && integer_onep (TREE_OPERAND (arg0
, 0)))
10471 return fold_build2_loc (loc
, LSHIFT_EXPR
, type
, op1
,
10472 TREE_OPERAND (arg0
, 1));
10474 /* (A + A) * C -> A * 2 * C */
10475 if (TREE_CODE (arg0
) == PLUS_EXPR
10476 && TREE_CODE (arg1
) == INTEGER_CST
10477 && operand_equal_p (TREE_OPERAND (arg0
, 0),
10478 TREE_OPERAND (arg0
, 1), 0))
10479 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10480 omit_one_operand_loc (loc
, type
,
10481 TREE_OPERAND (arg0
, 0),
10482 TREE_OPERAND (arg0
, 1)),
10483 fold_build2_loc (loc
, MULT_EXPR
, type
,
10484 build_int_cst (type
, 2) , arg1
));
10486 /* ((T) (X /[ex] C)) * C cancels out if the conversion is
10487 sign-changing only. */
10488 if (TREE_CODE (arg1
) == INTEGER_CST
10489 && TREE_CODE (arg0
) == EXACT_DIV_EXPR
10490 && operand_equal_p (arg1
, TREE_OPERAND (arg0
, 1), 0))
10491 return fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10493 strict_overflow_p
= false;
10494 if (TREE_CODE (arg1
) == INTEGER_CST
10495 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
10496 &strict_overflow_p
)))
10498 if (strict_overflow_p
)
10499 fold_overflow_warning (("assuming signed overflow does not "
10500 "occur when simplifying "
10502 WARN_STRICT_OVERFLOW_MISC
);
10503 return fold_convert_loc (loc
, type
, tem
);
10506 /* Optimize z * conj(z) for integer complex numbers. */
10507 if (TREE_CODE (arg0
) == CONJ_EXPR
10508 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10509 return fold_mult_zconjz (loc
, type
, arg1
);
10510 if (TREE_CODE (arg1
) == CONJ_EXPR
10511 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10512 return fold_mult_zconjz (loc
, type
, arg0
);
10516 /* Convert (C1/X)*C2 into (C1*C2)/X. This transformation may change
10517 the result for floating point types due to rounding so it is applied
10518 only if -fassociative-math was specify. */
10519 if (flag_associative_math
10520 && TREE_CODE (arg0
) == RDIV_EXPR
10521 && TREE_CODE (arg1
) == REAL_CST
10522 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == REAL_CST
)
10524 tree tem
= const_binop (MULT_EXPR
, TREE_OPERAND (arg0
, 0),
10527 return fold_build2_loc (loc
, RDIV_EXPR
, type
, tem
,
10528 TREE_OPERAND (arg0
, 1));
10531 /* Strip sign operations from X in X*X, i.e. -Y*-Y -> Y*Y. */
10532 if (operand_equal_p (arg0
, arg1
, 0))
10534 tree tem
= fold_strip_sign_ops (arg0
);
10535 if (tem
!= NULL_TREE
)
10537 tem
= fold_convert_loc (loc
, type
, tem
);
10538 return fold_build2_loc (loc
, MULT_EXPR
, type
, tem
, tem
);
10542 /* Fold z * +-I to __complex__ (-+__imag z, +-__real z).
10543 This is not the same for NaNs or if signed zeros are
10545 if (!HONOR_NANS (arg0
)
10546 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10547 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
))
10548 && TREE_CODE (arg1
) == COMPLEX_CST
10549 && real_zerop (TREE_REALPART (arg1
)))
10551 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10552 if (real_onep (TREE_IMAGPART (arg1
)))
10554 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10555 negate_expr (fold_build1_loc (loc
, IMAGPART_EXPR
,
10557 fold_build1_loc (loc
, REALPART_EXPR
, rtype
, arg0
));
10558 else if (real_minus_onep (TREE_IMAGPART (arg1
)))
10560 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10561 fold_build1_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
),
10562 negate_expr (fold_build1_loc (loc
, REALPART_EXPR
,
10566 /* Optimize z * conj(z) for floating point complex numbers.
10567 Guarded by flag_unsafe_math_optimizations as non-finite
10568 imaginary components don't produce scalar results. */
10569 if (flag_unsafe_math_optimizations
10570 && TREE_CODE (arg0
) == CONJ_EXPR
10571 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10572 return fold_mult_zconjz (loc
, type
, arg1
);
10573 if (flag_unsafe_math_optimizations
10574 && TREE_CODE (arg1
) == CONJ_EXPR
10575 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10576 return fold_mult_zconjz (loc
, type
, arg0
);
10578 if (flag_unsafe_math_optimizations
)
10580 enum built_in_function fcode0
= builtin_mathfn_code (arg0
);
10581 enum built_in_function fcode1
= builtin_mathfn_code (arg1
);
10583 /* Optimizations of root(...)*root(...). */
10584 if (fcode0
== fcode1
&& BUILTIN_ROOT_P (fcode0
))
10587 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
10588 tree arg10
= CALL_EXPR_ARG (arg1
, 0);
10590 /* Optimize sqrt(x)*sqrt(x) as x. */
10591 if (BUILTIN_SQRT_P (fcode0
)
10592 && operand_equal_p (arg00
, arg10
, 0)
10593 && ! HONOR_SNANS (element_mode (type
)))
10596 /* Optimize root(x)*root(y) as root(x*y). */
10597 rootfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
10598 arg
= fold_build2_loc (loc
, MULT_EXPR
, type
, arg00
, arg10
);
10599 return build_call_expr_loc (loc
, rootfn
, 1, arg
);
10602 /* Optimize expN(x)*expN(y) as expN(x+y). */
10603 if (fcode0
== fcode1
&& BUILTIN_EXPONENT_P (fcode0
))
10605 tree expfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
10606 tree arg
= fold_build2_loc (loc
, PLUS_EXPR
, type
,
10607 CALL_EXPR_ARG (arg0
, 0),
10608 CALL_EXPR_ARG (arg1
, 0));
10609 return build_call_expr_loc (loc
, expfn
, 1, arg
);
10612 /* Optimizations of pow(...)*pow(...). */
10613 if ((fcode0
== BUILT_IN_POW
&& fcode1
== BUILT_IN_POW
)
10614 || (fcode0
== BUILT_IN_POWF
&& fcode1
== BUILT_IN_POWF
)
10615 || (fcode0
== BUILT_IN_POWL
&& fcode1
== BUILT_IN_POWL
))
10617 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
10618 tree arg01
= CALL_EXPR_ARG (arg0
, 1);
10619 tree arg10
= CALL_EXPR_ARG (arg1
, 0);
10620 tree arg11
= CALL_EXPR_ARG (arg1
, 1);
10622 /* Optimize pow(x,y)*pow(z,y) as pow(x*z,y). */
10623 if (operand_equal_p (arg01
, arg11
, 0))
10625 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
10626 tree arg
= fold_build2_loc (loc
, MULT_EXPR
, type
,
10628 return build_call_expr_loc (loc
, powfn
, 2, arg
, arg01
);
10631 /* Optimize pow(x,y)*pow(x,z) as pow(x,y+z). */
10632 if (operand_equal_p (arg00
, arg10
, 0))
10634 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
10635 tree arg
= fold_build2_loc (loc
, PLUS_EXPR
, type
,
10637 return build_call_expr_loc (loc
, powfn
, 2, arg00
, arg
);
10641 /* Optimize tan(x)*cos(x) as sin(x). */
10642 if (((fcode0
== BUILT_IN_TAN
&& fcode1
== BUILT_IN_COS
)
10643 || (fcode0
== BUILT_IN_TANF
&& fcode1
== BUILT_IN_COSF
)
10644 || (fcode0
== BUILT_IN_TANL
&& fcode1
== BUILT_IN_COSL
)
10645 || (fcode0
== BUILT_IN_COS
&& fcode1
== BUILT_IN_TAN
)
10646 || (fcode0
== BUILT_IN_COSF
&& fcode1
== BUILT_IN_TANF
)
10647 || (fcode0
== BUILT_IN_COSL
&& fcode1
== BUILT_IN_TANL
))
10648 && operand_equal_p (CALL_EXPR_ARG (arg0
, 0),
10649 CALL_EXPR_ARG (arg1
, 0), 0))
10651 tree sinfn
= mathfn_built_in (type
, BUILT_IN_SIN
);
10653 if (sinfn
!= NULL_TREE
)
10654 return build_call_expr_loc (loc
, sinfn
, 1,
10655 CALL_EXPR_ARG (arg0
, 0));
10658 /* Optimize x*pow(x,c) as pow(x,c+1). */
10659 if (fcode1
== BUILT_IN_POW
10660 || fcode1
== BUILT_IN_POWF
10661 || fcode1
== BUILT_IN_POWL
)
10663 tree arg10
= CALL_EXPR_ARG (arg1
, 0);
10664 tree arg11
= CALL_EXPR_ARG (arg1
, 1);
10665 if (TREE_CODE (arg11
) == REAL_CST
10666 && !TREE_OVERFLOW (arg11
)
10667 && operand_equal_p (arg0
, arg10
, 0))
10669 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg1
), 0);
10673 c
= TREE_REAL_CST (arg11
);
10674 real_arithmetic (&c
, PLUS_EXPR
, &c
, &dconst1
);
10675 arg
= build_real (type
, c
);
10676 return build_call_expr_loc (loc
, powfn
, 2, arg0
, arg
);
10680 /* Optimize pow(x,c)*x as pow(x,c+1). */
10681 if (fcode0
== BUILT_IN_POW
10682 || fcode0
== BUILT_IN_POWF
10683 || fcode0
== BUILT_IN_POWL
)
10685 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
10686 tree arg01
= CALL_EXPR_ARG (arg0
, 1);
10687 if (TREE_CODE (arg01
) == REAL_CST
10688 && !TREE_OVERFLOW (arg01
)
10689 && operand_equal_p (arg1
, arg00
, 0))
10691 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
10695 c
= TREE_REAL_CST (arg01
);
10696 real_arithmetic (&c
, PLUS_EXPR
, &c
, &dconst1
);
10697 arg
= build_real (type
, c
);
10698 return build_call_expr_loc (loc
, powfn
, 2, arg1
, arg
);
10702 /* Canonicalize x*x as pow(x,2.0), which is expanded as x*x. */
10703 if (!in_gimple_form
10705 && operand_equal_p (arg0
, arg1
, 0))
10707 tree powfn
= mathfn_built_in (type
, BUILT_IN_POW
);
10711 tree arg
= build_real (type
, dconst2
);
10712 return build_call_expr_loc (loc
, powfn
, 2, arg0
, arg
);
10721 /* Canonicalize (X & C1) | C2. */
10722 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10723 && TREE_CODE (arg1
) == INTEGER_CST
10724 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10726 int width
= TYPE_PRECISION (type
), w
;
10727 wide_int c1
= TREE_OPERAND (arg0
, 1);
10728 wide_int c2
= arg1
;
10730 /* If (C1&C2) == C1, then (X&C1)|C2 becomes (X,C2). */
10731 if ((c1
& c2
) == c1
)
10732 return omit_one_operand_loc (loc
, type
, arg1
,
10733 TREE_OPERAND (arg0
, 0));
10735 wide_int msk
= wi::mask (width
, false,
10736 TYPE_PRECISION (TREE_TYPE (arg1
)));
10738 /* If (C1|C2) == ~0 then (X&C1)|C2 becomes X|C2. */
10739 if (msk
.and_not (c1
| c2
) == 0)
10740 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
,
10741 TREE_OPERAND (arg0
, 0), arg1
);
10743 /* Minimize the number of bits set in C1, i.e. C1 := C1 & ~C2,
10744 unless (C1 & ~C2) | (C2 & C3) for some C3 is a mask of some
10745 mode which allows further optimizations. */
10748 wide_int c3
= c1
.and_not (c2
);
10749 for (w
= BITS_PER_UNIT
; w
<= width
; w
<<= 1)
10751 wide_int mask
= wi::mask (w
, false,
10752 TYPE_PRECISION (type
));
10753 if (((c1
| c2
) & mask
) == mask
&& c1
.and_not (mask
) == 0)
10761 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
,
10762 fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10763 TREE_OPERAND (arg0
, 0),
10764 wide_int_to_tree (type
,
10769 /* (X & ~Y) | (~X & Y) is X ^ Y */
10770 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10771 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
10773 tree a0
, a1
, l0
, l1
, n0
, n1
;
10775 a0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
10776 a1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
10778 l0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10779 l1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10781 n0
= fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, l0
);
10782 n1
= fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, l1
);
10784 if ((operand_equal_p (n0
, a0
, 0)
10785 && operand_equal_p (n1
, a1
, 0))
10786 || (operand_equal_p (n0
, a1
, 0)
10787 && operand_equal_p (n1
, a0
, 0)))
10788 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
, l0
, n1
);
10791 t1
= distribute_bit_expr (loc
, code
, type
, arg0
, arg1
);
10792 if (t1
!= NULL_TREE
)
10795 /* See if this can be simplified into a rotate first. If that
10796 is unsuccessful continue in the association code. */
10800 /* Fold (X & 1) ^ 1 as (X & 1) == 0. */
10801 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10802 && INTEGRAL_TYPE_P (type
)
10803 && integer_onep (TREE_OPERAND (arg0
, 1))
10804 && integer_onep (arg1
))
10805 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg0
,
10806 build_zero_cst (TREE_TYPE (arg0
)));
10808 /* See if this can be simplified into a rotate first. If that
10809 is unsuccessful continue in the association code. */
10813 /* ~X & X, (X == 0) & X, and !X & X are always zero. */
10814 if ((TREE_CODE (arg0
) == BIT_NOT_EXPR
10815 || TREE_CODE (arg0
) == TRUTH_NOT_EXPR
10816 || (TREE_CODE (arg0
) == EQ_EXPR
10817 && integer_zerop (TREE_OPERAND (arg0
, 1))))
10818 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10819 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg1
);
10821 /* X & ~X , X & (X == 0), and X & !X are always zero. */
10822 if ((TREE_CODE (arg1
) == BIT_NOT_EXPR
10823 || TREE_CODE (arg1
) == TRUTH_NOT_EXPR
10824 || (TREE_CODE (arg1
) == EQ_EXPR
10825 && integer_zerop (TREE_OPERAND (arg1
, 1))))
10826 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10827 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
10829 /* Fold (X ^ 1) & 1 as (X & 1) == 0. */
10830 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
10831 && INTEGRAL_TYPE_P (type
)
10832 && integer_onep (TREE_OPERAND (arg0
, 1))
10833 && integer_onep (arg1
))
10836 tem
= TREE_OPERAND (arg0
, 0);
10837 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
10838 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
10840 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
10841 build_zero_cst (TREE_TYPE (tem
)));
10843 /* Fold ~X & 1 as (X & 1) == 0. */
10844 if (TREE_CODE (arg0
) == BIT_NOT_EXPR
10845 && INTEGRAL_TYPE_P (type
)
10846 && integer_onep (arg1
))
10849 tem
= TREE_OPERAND (arg0
, 0);
10850 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
10851 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
10853 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
10854 build_zero_cst (TREE_TYPE (tem
)));
10856 /* Fold !X & 1 as X == 0. */
10857 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
10858 && integer_onep (arg1
))
10860 tem
= TREE_OPERAND (arg0
, 0);
10861 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem
,
10862 build_zero_cst (TREE_TYPE (tem
)));
10865 /* Fold (X ^ Y) & Y as ~X & Y. */
10866 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
10867 && operand_equal_p (TREE_OPERAND (arg0
, 1), arg1
, 0))
10869 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10870 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10871 fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, tem
),
10872 fold_convert_loc (loc
, type
, arg1
));
10874 /* Fold (X ^ Y) & X as ~Y & X. */
10875 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
10876 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0)
10877 && reorder_operands_p (TREE_OPERAND (arg0
, 1), arg1
))
10879 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
10880 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10881 fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, tem
),
10882 fold_convert_loc (loc
, type
, arg1
));
10884 /* Fold X & (X ^ Y) as X & ~Y. */
10885 if (TREE_CODE (arg1
) == BIT_XOR_EXPR
10886 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10888 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
10889 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10890 fold_convert_loc (loc
, type
, arg0
),
10891 fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, tem
));
10893 /* Fold X & (Y ^ X) as ~Y & X. */
10894 if (TREE_CODE (arg1
) == BIT_XOR_EXPR
10895 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 1), 0)
10896 && reorder_operands_p (arg0
, TREE_OPERAND (arg1
, 0)))
10898 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
10899 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
10900 fold_build1_loc (loc
, BIT_NOT_EXPR
, type
, tem
),
10901 fold_convert_loc (loc
, type
, arg0
));
10904 /* Fold (X * Y) & -(1 << CST) to X * Y if Y is a constant
10905 multiple of 1 << CST. */
10906 if (TREE_CODE (arg1
) == INTEGER_CST
)
10908 wide_int cst1
= arg1
;
10909 wide_int ncst1
= -cst1
;
10910 if ((cst1
& ncst1
) == ncst1
10911 && multiple_of_p (type
, arg0
,
10912 wide_int_to_tree (TREE_TYPE (arg1
), ncst1
)))
10913 return fold_convert_loc (loc
, type
, arg0
);
10916 /* Fold (X * CST1) & CST2 to zero if we can, or drop known zero
10918 if (TREE_CODE (arg1
) == INTEGER_CST
10919 && TREE_CODE (arg0
) == MULT_EXPR
10920 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10922 wide_int warg1
= arg1
;
10923 wide_int masked
= mask_with_tz (type
, warg1
, TREE_OPERAND (arg0
, 1));
10926 return omit_two_operands_loc (loc
, type
, build_zero_cst (type
),
10928 else if (masked
!= warg1
)
10930 /* Avoid the transform if arg1 is a mask of some
10931 mode which allows further optimizations. */
10932 int pop
= wi::popcount (warg1
);
10933 if (!(pop
>= BITS_PER_UNIT
10934 && exact_log2 (pop
) != -1
10935 && wi::mask (pop
, false, warg1
.get_precision ()) == warg1
))
10936 return fold_build2_loc (loc
, code
, type
, op0
,
10937 wide_int_to_tree (type
, masked
));
10941 /* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
10942 ((A & N) + B) & M -> (A + B) & M
10943 Similarly if (N & M) == 0,
10944 ((A | N) + B) & M -> (A + B) & M
10945 and for - instead of + (or unary - instead of +)
10946 and/or ^ instead of |.
10947 If B is constant and (B & M) == 0, fold into A & M. */
10948 if (TREE_CODE (arg1
) == INTEGER_CST
)
10950 wide_int cst1
= arg1
;
10951 if ((~cst1
!= 0) && (cst1
& (cst1
+ 1)) == 0
10952 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10953 && (TREE_CODE (arg0
) == PLUS_EXPR
10954 || TREE_CODE (arg0
) == MINUS_EXPR
10955 || TREE_CODE (arg0
) == NEGATE_EXPR
)
10956 && (TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
))
10957 || TREE_CODE (TREE_TYPE (arg0
)) == INTEGER_TYPE
))
10963 /* Now we know that arg0 is (C + D) or (C - D) or
10964 -C and arg1 (M) is == (1LL << cst) - 1.
10965 Store C into PMOP[0] and D into PMOP[1]. */
10966 pmop
[0] = TREE_OPERAND (arg0
, 0);
10968 if (TREE_CODE (arg0
) != NEGATE_EXPR
)
10970 pmop
[1] = TREE_OPERAND (arg0
, 1);
10974 if ((wi::max_value (TREE_TYPE (arg0
)) & cst1
) != cst1
)
10977 for (; which
>= 0; which
--)
10978 switch (TREE_CODE (pmop
[which
]))
10983 if (TREE_CODE (TREE_OPERAND (pmop
[which
], 1))
10986 cst0
= TREE_OPERAND (pmop
[which
], 1);
10988 if (TREE_CODE (pmop
[which
]) == BIT_AND_EXPR
)
10993 else if (cst0
!= 0)
10995 /* If C or D is of the form (A & N) where
10996 (N & M) == M, or of the form (A | N) or
10997 (A ^ N) where (N & M) == 0, replace it with A. */
10998 pmop
[which
] = TREE_OPERAND (pmop
[which
], 0);
11001 /* If C or D is a N where (N & M) == 0, it can be
11002 omitted (assumed 0). */
11003 if ((TREE_CODE (arg0
) == PLUS_EXPR
11004 || (TREE_CODE (arg0
) == MINUS_EXPR
&& which
== 0))
11005 && (cst1
& pmop
[which
]) == 0)
11006 pmop
[which
] = NULL
;
11012 /* Only build anything new if we optimized one or both arguments
11014 if (pmop
[0] != TREE_OPERAND (arg0
, 0)
11015 || (TREE_CODE (arg0
) != NEGATE_EXPR
11016 && pmop
[1] != TREE_OPERAND (arg0
, 1)))
11018 tree utype
= TREE_TYPE (arg0
);
11019 if (! TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
11021 /* Perform the operations in a type that has defined
11022 overflow behavior. */
11023 utype
= unsigned_type_for (TREE_TYPE (arg0
));
11024 if (pmop
[0] != NULL
)
11025 pmop
[0] = fold_convert_loc (loc
, utype
, pmop
[0]);
11026 if (pmop
[1] != NULL
)
11027 pmop
[1] = fold_convert_loc (loc
, utype
, pmop
[1]);
11030 if (TREE_CODE (arg0
) == NEGATE_EXPR
)
11031 tem
= fold_build1_loc (loc
, NEGATE_EXPR
, utype
, pmop
[0]);
11032 else if (TREE_CODE (arg0
) == PLUS_EXPR
)
11034 if (pmop
[0] != NULL
&& pmop
[1] != NULL
)
11035 tem
= fold_build2_loc (loc
, PLUS_EXPR
, utype
,
11037 else if (pmop
[0] != NULL
)
11039 else if (pmop
[1] != NULL
)
11042 return build_int_cst (type
, 0);
11044 else if (pmop
[0] == NULL
)
11045 tem
= fold_build1_loc (loc
, NEGATE_EXPR
, utype
, pmop
[1]);
11047 tem
= fold_build2_loc (loc
, MINUS_EXPR
, utype
,
11049 /* TEM is now the new binary +, - or unary - replacement. */
11050 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, utype
, tem
,
11051 fold_convert_loc (loc
, utype
, arg1
));
11052 return fold_convert_loc (loc
, type
, tem
);
11057 t1
= distribute_bit_expr (loc
, code
, type
, arg0
, arg1
);
11058 if (t1
!= NULL_TREE
)
11060 /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */
11061 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) == NOP_EXPR
11062 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0
, 0))))
11064 prec
= element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)));
11066 wide_int mask
= wide_int::from (arg1
, prec
, UNSIGNED
);
11069 fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11075 /* Don't touch a floating-point divide by zero unless the mode
11076 of the constant can represent infinity. */
11077 if (TREE_CODE (arg1
) == REAL_CST
11078 && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1
)))
11079 && real_zerop (arg1
))
11082 /* (-A) / (-B) -> A / B */
11083 if (TREE_CODE (arg0
) == NEGATE_EXPR
&& negate_expr_p (arg1
))
11084 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11085 TREE_OPERAND (arg0
, 0),
11086 negate_expr (arg1
));
11087 if (TREE_CODE (arg1
) == NEGATE_EXPR
&& negate_expr_p (arg0
))
11088 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11089 negate_expr (arg0
),
11090 TREE_OPERAND (arg1
, 0));
11092 /* Convert A/B/C to A/(B*C). */
11093 if (flag_reciprocal_math
11094 && TREE_CODE (arg0
) == RDIV_EXPR
)
11095 return fold_build2_loc (loc
, RDIV_EXPR
, type
, TREE_OPERAND (arg0
, 0),
11096 fold_build2_loc (loc
, MULT_EXPR
, type
,
11097 TREE_OPERAND (arg0
, 1), arg1
));
11099 /* Convert A/(B/C) to (A/B)*C. */
11100 if (flag_reciprocal_math
11101 && TREE_CODE (arg1
) == RDIV_EXPR
)
11102 return fold_build2_loc (loc
, MULT_EXPR
, type
,
11103 fold_build2_loc (loc
, RDIV_EXPR
, type
, arg0
,
11104 TREE_OPERAND (arg1
, 0)),
11105 TREE_OPERAND (arg1
, 1));
11107 /* Convert C1/(X*C2) into (C1/C2)/X. */
11108 if (flag_reciprocal_math
11109 && TREE_CODE (arg1
) == MULT_EXPR
11110 && TREE_CODE (arg0
) == REAL_CST
11111 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == REAL_CST
)
11113 tree tem
= const_binop (RDIV_EXPR
, arg0
,
11114 TREE_OPERAND (arg1
, 1));
11116 return fold_build2_loc (loc
, RDIV_EXPR
, type
, tem
,
11117 TREE_OPERAND (arg1
, 0));
11120 if (flag_unsafe_math_optimizations
)
11122 enum built_in_function fcode0
= builtin_mathfn_code (arg0
);
11123 enum built_in_function fcode1
= builtin_mathfn_code (arg1
);
11125 /* Optimize sin(x)/cos(x) as tan(x). */
11126 if (((fcode0
== BUILT_IN_SIN
&& fcode1
== BUILT_IN_COS
)
11127 || (fcode0
== BUILT_IN_SINF
&& fcode1
== BUILT_IN_COSF
)
11128 || (fcode0
== BUILT_IN_SINL
&& fcode1
== BUILT_IN_COSL
))
11129 && operand_equal_p (CALL_EXPR_ARG (arg0
, 0),
11130 CALL_EXPR_ARG (arg1
, 0), 0))
11132 tree tanfn
= mathfn_built_in (type
, BUILT_IN_TAN
);
11134 if (tanfn
!= NULL_TREE
)
11135 return build_call_expr_loc (loc
, tanfn
, 1, CALL_EXPR_ARG (arg0
, 0));
11138 /* Optimize cos(x)/sin(x) as 1.0/tan(x). */
11139 if (((fcode0
== BUILT_IN_COS
&& fcode1
== BUILT_IN_SIN
)
11140 || (fcode0
== BUILT_IN_COSF
&& fcode1
== BUILT_IN_SINF
)
11141 || (fcode0
== BUILT_IN_COSL
&& fcode1
== BUILT_IN_SINL
))
11142 && operand_equal_p (CALL_EXPR_ARG (arg0
, 0),
11143 CALL_EXPR_ARG (arg1
, 0), 0))
11145 tree tanfn
= mathfn_built_in (type
, BUILT_IN_TAN
);
11147 if (tanfn
!= NULL_TREE
)
11149 tree tmp
= build_call_expr_loc (loc
, tanfn
, 1,
11150 CALL_EXPR_ARG (arg0
, 0));
11151 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11152 build_real (type
, dconst1
), tmp
);
11156 /* Optimize sin(x)/tan(x) as cos(x) if we don't care about
11157 NaNs or Infinities. */
11158 if (((fcode0
== BUILT_IN_SIN
&& fcode1
== BUILT_IN_TAN
)
11159 || (fcode0
== BUILT_IN_SINF
&& fcode1
== BUILT_IN_TANF
)
11160 || (fcode0
== BUILT_IN_SINL
&& fcode1
== BUILT_IN_TANL
)))
11162 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
11163 tree arg01
= CALL_EXPR_ARG (arg1
, 0);
11165 if (! HONOR_NANS (arg00
)
11166 && ! HONOR_INFINITIES (element_mode (arg00
))
11167 && operand_equal_p (arg00
, arg01
, 0))
11169 tree cosfn
= mathfn_built_in (type
, BUILT_IN_COS
);
11171 if (cosfn
!= NULL_TREE
)
11172 return build_call_expr_loc (loc
, cosfn
, 1, arg00
);
11176 /* Optimize tan(x)/sin(x) as 1.0/cos(x) if we don't care about
11177 NaNs or Infinities. */
11178 if (((fcode0
== BUILT_IN_TAN
&& fcode1
== BUILT_IN_SIN
)
11179 || (fcode0
== BUILT_IN_TANF
&& fcode1
== BUILT_IN_SINF
)
11180 || (fcode0
== BUILT_IN_TANL
&& fcode1
== BUILT_IN_SINL
)))
11182 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
11183 tree arg01
= CALL_EXPR_ARG (arg1
, 0);
11185 if (! HONOR_NANS (arg00
)
11186 && ! HONOR_INFINITIES (element_mode (arg00
))
11187 && operand_equal_p (arg00
, arg01
, 0))
11189 tree cosfn
= mathfn_built_in (type
, BUILT_IN_COS
);
11191 if (cosfn
!= NULL_TREE
)
11193 tree tmp
= build_call_expr_loc (loc
, cosfn
, 1, arg00
);
11194 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11195 build_real (type
, dconst1
),
11201 /* Optimize pow(x,c)/x as pow(x,c-1). */
11202 if (fcode0
== BUILT_IN_POW
11203 || fcode0
== BUILT_IN_POWF
11204 || fcode0
== BUILT_IN_POWL
)
11206 tree arg00
= CALL_EXPR_ARG (arg0
, 0);
11207 tree arg01
= CALL_EXPR_ARG (arg0
, 1);
11208 if (TREE_CODE (arg01
) == REAL_CST
11209 && !TREE_OVERFLOW (arg01
)
11210 && operand_equal_p (arg1
, arg00
, 0))
11212 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg0
), 0);
11216 c
= TREE_REAL_CST (arg01
);
11217 real_arithmetic (&c
, MINUS_EXPR
, &c
, &dconst1
);
11218 arg
= build_real (type
, c
);
11219 return build_call_expr_loc (loc
, powfn
, 2, arg1
, arg
);
11223 /* Optimize a/root(b/c) into a*root(c/b). */
11224 if (BUILTIN_ROOT_P (fcode1
))
11226 tree rootarg
= CALL_EXPR_ARG (arg1
, 0);
11228 if (TREE_CODE (rootarg
) == RDIV_EXPR
)
11230 tree rootfn
= TREE_OPERAND (CALL_EXPR_FN (arg1
), 0);
11231 tree b
= TREE_OPERAND (rootarg
, 0);
11232 tree c
= TREE_OPERAND (rootarg
, 1);
11234 tree tmp
= fold_build2_loc (loc
, RDIV_EXPR
, type
, c
, b
);
11236 tmp
= build_call_expr_loc (loc
, rootfn
, 1, tmp
);
11237 return fold_build2_loc (loc
, MULT_EXPR
, type
, arg0
, tmp
);
11241 /* Optimize x/expN(y) into x*expN(-y). */
11242 if (BUILTIN_EXPONENT_P (fcode1
))
11244 tree expfn
= TREE_OPERAND (CALL_EXPR_FN (arg1
), 0);
11245 tree arg
= negate_expr (CALL_EXPR_ARG (arg1
, 0));
11246 arg1
= build_call_expr_loc (loc
,
11248 fold_convert_loc (loc
, type
, arg
));
11249 return fold_build2_loc (loc
, MULT_EXPR
, type
, arg0
, arg1
);
11252 /* Optimize x/pow(y,z) into x*pow(y,-z). */
11253 if (fcode1
== BUILT_IN_POW
11254 || fcode1
== BUILT_IN_POWF
11255 || fcode1
== BUILT_IN_POWL
)
11257 tree powfn
= TREE_OPERAND (CALL_EXPR_FN (arg1
), 0);
11258 tree arg10
= CALL_EXPR_ARG (arg1
, 0);
11259 tree arg11
= CALL_EXPR_ARG (arg1
, 1);
11260 tree neg11
= fold_convert_loc (loc
, type
,
11261 negate_expr (arg11
));
11262 arg1
= build_call_expr_loc (loc
, powfn
, 2, arg10
, neg11
);
11263 return fold_build2_loc (loc
, MULT_EXPR
, type
, arg0
, arg1
);
11268 case TRUNC_DIV_EXPR
:
11269 /* Optimize (X & (-A)) / A where A is a power of 2,
11271 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11272 && !TYPE_UNSIGNED (type
) && TREE_CODE (arg1
) == INTEGER_CST
11273 && integer_pow2p (arg1
) && tree_int_cst_sgn (arg1
) > 0)
11275 tree sum
= fold_binary_loc (loc
, PLUS_EXPR
, TREE_TYPE (arg1
),
11276 arg1
, TREE_OPERAND (arg0
, 1));
11277 if (sum
&& integer_zerop (sum
)) {
11278 tree pow2
= build_int_cst (integer_type_node
,
11279 wi::exact_log2 (arg1
));
11280 return fold_build2_loc (loc
, RSHIFT_EXPR
, type
,
11281 TREE_OPERAND (arg0
, 0), pow2
);
11287 case FLOOR_DIV_EXPR
:
11288 /* Simplify A / (B << N) where A and B are positive and B is
11289 a power of 2, to A >> (N + log2(B)). */
11290 strict_overflow_p
= false;
11291 if (TREE_CODE (arg1
) == LSHIFT_EXPR
11292 && (TYPE_UNSIGNED (type
)
11293 || tree_expr_nonnegative_warnv_p (op0
, &strict_overflow_p
)))
11295 tree sval
= TREE_OPERAND (arg1
, 0);
11296 if (integer_pow2p (sval
) && tree_int_cst_sgn (sval
) > 0)
11298 tree sh_cnt
= TREE_OPERAND (arg1
, 1);
11299 tree pow2
= build_int_cst (TREE_TYPE (sh_cnt
),
11300 wi::exact_log2 (sval
));
11302 if (strict_overflow_p
)
11303 fold_overflow_warning (("assuming signed overflow does not "
11304 "occur when simplifying A / (B << N)"),
11305 WARN_STRICT_OVERFLOW_MISC
);
11307 sh_cnt
= fold_build2_loc (loc
, PLUS_EXPR
, TREE_TYPE (sh_cnt
),
11309 return fold_build2_loc (loc
, RSHIFT_EXPR
, type
,
11310 fold_convert_loc (loc
, type
, arg0
), sh_cnt
);
11316 case ROUND_DIV_EXPR
:
11317 case CEIL_DIV_EXPR
:
11318 case EXACT_DIV_EXPR
:
11319 if (integer_zerop (arg1
))
11322 /* Convert -A / -B to A / B when the type is signed and overflow is
11324 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11325 && TREE_CODE (arg0
) == NEGATE_EXPR
11326 && negate_expr_p (arg1
))
11328 if (INTEGRAL_TYPE_P (type
))
11329 fold_overflow_warning (("assuming signed overflow does not occur "
11330 "when distributing negation across "
11332 WARN_STRICT_OVERFLOW_MISC
);
11333 return fold_build2_loc (loc
, code
, type
,
11334 fold_convert_loc (loc
, type
,
11335 TREE_OPERAND (arg0
, 0)),
11336 fold_convert_loc (loc
, type
,
11337 negate_expr (arg1
)));
11339 if ((!INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11340 && TREE_CODE (arg1
) == NEGATE_EXPR
11341 && negate_expr_p (arg0
))
11343 if (INTEGRAL_TYPE_P (type
))
11344 fold_overflow_warning (("assuming signed overflow does not occur "
11345 "when distributing negation across "
11347 WARN_STRICT_OVERFLOW_MISC
);
11348 return fold_build2_loc (loc
, code
, type
,
11349 fold_convert_loc (loc
, type
,
11350 negate_expr (arg0
)),
11351 fold_convert_loc (loc
, type
,
11352 TREE_OPERAND (arg1
, 0)));
11355 /* If arg0 is a multiple of arg1, then rewrite to the fastest div
11356 operation, EXACT_DIV_EXPR.
11358 Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now.
11359 At one time others generated faster code, it's not clear if they do
11360 after the last round to changes to the DIV code in expmed.c. */
11361 if ((code
== CEIL_DIV_EXPR
|| code
== FLOOR_DIV_EXPR
)
11362 && multiple_of_p (type
, arg0
, arg1
))
11363 return fold_build2_loc (loc
, EXACT_DIV_EXPR
, type
, arg0
, arg1
);
11365 strict_overflow_p
= false;
11366 if (TREE_CODE (arg1
) == INTEGER_CST
11367 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11368 &strict_overflow_p
)))
11370 if (strict_overflow_p
)
11371 fold_overflow_warning (("assuming signed overflow does not occur "
11372 "when simplifying division"),
11373 WARN_STRICT_OVERFLOW_MISC
);
11374 return fold_convert_loc (loc
, type
, tem
);
11379 case CEIL_MOD_EXPR
:
11380 case FLOOR_MOD_EXPR
:
11381 case ROUND_MOD_EXPR
:
11382 case TRUNC_MOD_EXPR
:
11383 strict_overflow_p
= false;
11384 if (TREE_CODE (arg1
) == INTEGER_CST
11385 && 0 != (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11386 &strict_overflow_p
)))
11388 if (strict_overflow_p
)
11389 fold_overflow_warning (("assuming signed overflow does not occur "
11390 "when simplifying modulus"),
11391 WARN_STRICT_OVERFLOW_MISC
);
11392 return fold_convert_loc (loc
, type
, tem
);
11401 /* Since negative shift count is not well-defined,
11402 don't try to compute it in the compiler. */
11403 if (TREE_CODE (arg1
) == INTEGER_CST
&& tree_int_cst_sgn (arg1
) < 0)
11406 prec
= element_precision (type
);
11408 /* Turn (a OP c1) OP c2 into a OP (c1+c2). */
11409 if (TREE_CODE (op0
) == code
&& tree_fits_uhwi_p (arg1
)
11410 && tree_to_uhwi (arg1
) < prec
11411 && tree_fits_uhwi_p (TREE_OPERAND (arg0
, 1))
11412 && tree_to_uhwi (TREE_OPERAND (arg0
, 1)) < prec
)
11414 unsigned int low
= (tree_to_uhwi (TREE_OPERAND (arg0
, 1))
11415 + tree_to_uhwi (arg1
));
11417 /* Deal with a OP (c1 + c2) being undefined but (a OP c1) OP c2
11418 being well defined. */
11421 if (code
== LROTATE_EXPR
|| code
== RROTATE_EXPR
)
11423 else if (TYPE_UNSIGNED (type
) || code
== LSHIFT_EXPR
)
11424 return omit_one_operand_loc (loc
, type
, build_zero_cst (type
),
11425 TREE_OPERAND (arg0
, 0));
11430 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0),
11431 build_int_cst (TREE_TYPE (arg1
), low
));
11434 /* Transform (x >> c) << c into x & (-1<<c), or transform (x << c) >> c
11435 into x & ((unsigned)-1 >> c) for unsigned types. */
11436 if (((code
== LSHIFT_EXPR
&& TREE_CODE (arg0
) == RSHIFT_EXPR
)
11437 || (TYPE_UNSIGNED (type
)
11438 && code
== RSHIFT_EXPR
&& TREE_CODE (arg0
) == LSHIFT_EXPR
))
11439 && tree_fits_uhwi_p (arg1
)
11440 && tree_to_uhwi (arg1
) < prec
11441 && tree_fits_uhwi_p (TREE_OPERAND (arg0
, 1))
11442 && tree_to_uhwi (TREE_OPERAND (arg0
, 1)) < prec
)
11444 HOST_WIDE_INT low0
= tree_to_uhwi (TREE_OPERAND (arg0
, 1));
11445 HOST_WIDE_INT low1
= tree_to_uhwi (arg1
);
11451 arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11453 lshift
= build_minus_one_cst (type
);
11454 lshift
= const_binop (code
, lshift
, arg1
);
11456 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
, arg00
, lshift
);
11460 /* If we have a rotate of a bit operation with the rotate count and
11461 the second operand of the bit operation both constant,
11462 permute the two operations. */
11463 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11464 && (TREE_CODE (arg0
) == BIT_AND_EXPR
11465 || TREE_CODE (arg0
) == BIT_IOR_EXPR
11466 || TREE_CODE (arg0
) == BIT_XOR_EXPR
)
11467 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11468 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
11469 fold_build2_loc (loc
, code
, type
,
11470 TREE_OPERAND (arg0
, 0), arg1
),
11471 fold_build2_loc (loc
, code
, type
,
11472 TREE_OPERAND (arg0
, 1), arg1
));
11474 /* Two consecutive rotates adding up to the some integer
11475 multiple of the precision of the type can be ignored. */
11476 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11477 && TREE_CODE (arg0
) == RROTATE_EXPR
11478 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
11479 && wi::umod_trunc (wi::add (arg1
, TREE_OPERAND (arg0
, 1)),
11481 return TREE_OPERAND (arg0
, 0);
11483 /* Fold (X & C2) << C1 into (X << C1) & (C2 << C1)
11484 (X & C2) >> C1 into (X >> C1) & (C2 >> C1)
11485 if the latter can be further optimized. */
11486 if ((code
== LSHIFT_EXPR
|| code
== RSHIFT_EXPR
)
11487 && TREE_CODE (arg0
) == BIT_AND_EXPR
11488 && TREE_CODE (arg1
) == INTEGER_CST
11489 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11491 tree mask
= fold_build2_loc (loc
, code
, type
,
11492 fold_convert_loc (loc
, type
,
11493 TREE_OPERAND (arg0
, 1)),
11495 tree shift
= fold_build2_loc (loc
, code
, type
,
11496 fold_convert_loc (loc
, type
,
11497 TREE_OPERAND (arg0
, 0)),
11499 tem
= fold_binary_loc (loc
, BIT_AND_EXPR
, type
, shift
, mask
);
11507 tem
= fold_minmax (loc
, MIN_EXPR
, type
, arg0
, arg1
);
11513 tem
= fold_minmax (loc
, MAX_EXPR
, type
, arg0
, arg1
);
11518 case TRUTH_ANDIF_EXPR
:
11519 /* Note that the operands of this must be ints
11520 and their values must be 0 or 1.
11521 ("true" is a fixed value perhaps depending on the language.) */
11522 /* If first arg is constant zero, return it. */
11523 if (integer_zerop (arg0
))
11524 return fold_convert_loc (loc
, type
, arg0
);
11525 case TRUTH_AND_EXPR
:
11526 /* If either arg is constant true, drop it. */
11527 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11528 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11529 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
)
11530 /* Preserve sequence points. */
11531 && (code
!= TRUTH_ANDIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11532 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11533 /* If second arg is constant zero, result is zero, but first arg
11534 must be evaluated. */
11535 if (integer_zerop (arg1
))
11536 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11537 /* Likewise for first arg, but note that only the TRUTH_AND_EXPR
11538 case will be handled here. */
11539 if (integer_zerop (arg0
))
11540 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11542 /* !X && X is always false. */
11543 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11544 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11545 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg1
);
11546 /* X && !X is always false. */
11547 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11548 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11549 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11551 /* A < X && A + 1 > Y ==> A < X && A >= Y. Normally A + 1 > Y
11552 means A >= Y && A != MAX, but in this case we know that
11555 if (!TREE_SIDE_EFFECTS (arg0
)
11556 && !TREE_SIDE_EFFECTS (arg1
))
11558 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg0
, arg1
);
11559 if (tem
&& !operand_equal_p (tem
, arg0
, 0))
11560 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
11562 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg1
, arg0
);
11563 if (tem
&& !operand_equal_p (tem
, arg1
, 0))
11564 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
11567 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11573 case TRUTH_ORIF_EXPR
:
11574 /* Note that the operands of this must be ints
11575 and their values must be 0 or true.
11576 ("true" is a fixed value perhaps depending on the language.) */
11577 /* If first arg is constant true, return it. */
11578 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11579 return fold_convert_loc (loc
, type
, arg0
);
11580 case TRUTH_OR_EXPR
:
11581 /* If either arg is constant zero, drop it. */
11582 if (TREE_CODE (arg0
) == INTEGER_CST
&& integer_zerop (arg0
))
11583 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11584 if (TREE_CODE (arg1
) == INTEGER_CST
&& integer_zerop (arg1
)
11585 /* Preserve sequence points. */
11586 && (code
!= TRUTH_ORIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11587 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11588 /* If second arg is constant true, result is true, but we must
11589 evaluate first arg. */
11590 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
))
11591 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11592 /* Likewise for first arg, but note this only occurs here for
11594 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11595 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11597 /* !X || X is always true. */
11598 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11599 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11600 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11601 /* X || !X is always true. */
11602 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11603 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11604 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11606 /* (X && !Y) || (!X && Y) is X ^ Y */
11607 if (TREE_CODE (arg0
) == TRUTH_AND_EXPR
11608 && TREE_CODE (arg1
) == TRUTH_AND_EXPR
)
11610 tree a0
, a1
, l0
, l1
, n0
, n1
;
11612 a0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
11613 a1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
11615 l0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11616 l1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
11618 n0
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l0
);
11619 n1
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l1
);
11621 if ((operand_equal_p (n0
, a0
, 0)
11622 && operand_equal_p (n1
, a1
, 0))
11623 || (operand_equal_p (n0
, a1
, 0)
11624 && operand_equal_p (n1
, a0
, 0)))
11625 return fold_build2_loc (loc
, TRUTH_XOR_EXPR
, type
, l0
, n1
);
11628 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11634 case TRUTH_XOR_EXPR
:
11635 /* If the second arg is constant zero, drop it. */
11636 if (integer_zerop (arg1
))
11637 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11638 /* If the second arg is constant true, this is a logical inversion. */
11639 if (integer_onep (arg1
))
11641 tem
= invert_truthvalue_loc (loc
, arg0
);
11642 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
11644 /* Identical arguments cancel to zero. */
11645 if (operand_equal_p (arg0
, arg1
, 0))
11646 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11648 /* !X ^ X is always true. */
11649 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11650 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11651 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11653 /* X ^ !X is always true. */
11654 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11655 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11656 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11665 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
11666 if (tem
!= NULL_TREE
)
11669 /* bool_var != 0 becomes bool_var. */
11670 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_zerop (arg1
)
11671 && code
== NE_EXPR
)
11672 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11674 /* bool_var == 1 becomes bool_var. */
11675 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_onep (arg1
)
11676 && code
== EQ_EXPR
)
11677 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11679 /* bool_var != 1 becomes !bool_var. */
11680 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_onep (arg1
)
11681 && code
== NE_EXPR
)
11682 return fold_convert_loc (loc
, type
,
11683 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11684 TREE_TYPE (arg0
), arg0
));
11686 /* bool_var == 0 becomes !bool_var. */
11687 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_zerop (arg1
)
11688 && code
== EQ_EXPR
)
11689 return fold_convert_loc (loc
, type
,
11690 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11691 TREE_TYPE (arg0
), arg0
));
11693 /* !exp != 0 becomes !exp */
11694 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
&& integer_zerop (arg1
)
11695 && code
== NE_EXPR
)
11696 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11698 /* If this is an equality comparison of the address of two non-weak,
11699 unaliased symbols neither of which are extern (since we do not
11700 have access to attributes for externs), then we know the result. */
11701 if (TREE_CODE (arg0
) == ADDR_EXPR
11702 && DECL_P (TREE_OPERAND (arg0
, 0))
11703 && TREE_CODE (arg1
) == ADDR_EXPR
11704 && DECL_P (TREE_OPERAND (arg1
, 0)))
11708 if (decl_in_symtab_p (TREE_OPERAND (arg0
, 0))
11709 && decl_in_symtab_p (TREE_OPERAND (arg1
, 0)))
11710 equal
= symtab_node::get_create (TREE_OPERAND (arg0
, 0))
11711 ->equal_address_to (symtab_node::get_create
11712 (TREE_OPERAND (arg1
, 0)));
11714 equal
= TREE_OPERAND (arg0
, 0) == TREE_OPERAND (arg1
, 0);
11716 return constant_boolean_node (equal
11717 ? code
== EQ_EXPR
: code
!= EQ_EXPR
,
11721 /* Similarly for a BIT_XOR_EXPR; X ^ C1 == C2 is X == (C1 ^ C2). */
11722 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11723 && TREE_CODE (arg1
) == INTEGER_CST
11724 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11725 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0),
11726 fold_build2_loc (loc
, BIT_XOR_EXPR
, TREE_TYPE (arg0
),
11727 fold_convert_loc (loc
,
11730 TREE_OPERAND (arg0
, 1)));
11732 /* Transform comparisons of the form X +- Y CMP X to Y CMP 0. */
11733 if ((TREE_CODE (arg0
) == PLUS_EXPR
11734 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
11735 || TREE_CODE (arg0
) == MINUS_EXPR
)
11736 && operand_equal_p (tree_strip_nop_conversions (TREE_OPERAND (arg0
,
11739 && (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
11740 || POINTER_TYPE_P (TREE_TYPE (arg0
))))
11742 tree val
= TREE_OPERAND (arg0
, 1);
11743 return omit_two_operands_loc (loc
, type
,
11744 fold_build2_loc (loc
, code
, type
,
11746 build_int_cst (TREE_TYPE (val
),
11748 TREE_OPERAND (arg0
, 0), arg1
);
11751 /* Transform comparisons of the form C - X CMP X if C % 2 == 1. */
11752 if (TREE_CODE (arg0
) == MINUS_EXPR
11753 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == INTEGER_CST
11754 && operand_equal_p (tree_strip_nop_conversions (TREE_OPERAND (arg0
,
11757 && wi::extract_uhwi (TREE_OPERAND (arg0
, 0), 0, 1) == 1)
11759 return omit_two_operands_loc (loc
, type
,
11761 ? boolean_true_node
: boolean_false_node
,
11762 TREE_OPERAND (arg0
, 1), arg1
);
11765 /* Convert ABS_EXPR<x> == 0 or ABS_EXPR<x> != 0 to x == 0 or x != 0. */
11766 if (TREE_CODE (arg0
) == ABS_EXPR
11767 && (integer_zerop (arg1
) || real_zerop (arg1
)))
11768 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), arg1
);
11770 /* If this is an EQ or NE comparison with zero and ARG0 is
11771 (1 << foo) & bar, convert it to (bar >> foo) & 1. Both require
11772 two operations, but the latter can be done in one less insn
11773 on machines that have only two-operand insns or on which a
11774 constant cannot be the first operand. */
11775 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11776 && integer_zerop (arg1
))
11778 tree arg00
= TREE_OPERAND (arg0
, 0);
11779 tree arg01
= TREE_OPERAND (arg0
, 1);
11780 if (TREE_CODE (arg00
) == LSHIFT_EXPR
11781 && integer_onep (TREE_OPERAND (arg00
, 0)))
11783 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg00
),
11784 arg01
, TREE_OPERAND (arg00
, 1));
11785 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11786 build_int_cst (TREE_TYPE (arg0
), 1));
11787 return fold_build2_loc (loc
, code
, type
,
11788 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11791 else if (TREE_CODE (arg01
) == LSHIFT_EXPR
11792 && integer_onep (TREE_OPERAND (arg01
, 0)))
11794 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg01
),
11795 arg00
, TREE_OPERAND (arg01
, 1));
11796 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11797 build_int_cst (TREE_TYPE (arg0
), 1));
11798 return fold_build2_loc (loc
, code
, type
,
11799 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11804 /* If this is an NE or EQ comparison of zero against the result of a
11805 signed MOD operation whose second operand is a power of 2, make
11806 the MOD operation unsigned since it is simpler and equivalent. */
11807 if (integer_zerop (arg1
)
11808 && !TYPE_UNSIGNED (TREE_TYPE (arg0
))
11809 && (TREE_CODE (arg0
) == TRUNC_MOD_EXPR
11810 || TREE_CODE (arg0
) == CEIL_MOD_EXPR
11811 || TREE_CODE (arg0
) == FLOOR_MOD_EXPR
11812 || TREE_CODE (arg0
) == ROUND_MOD_EXPR
)
11813 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
11815 tree newtype
= unsigned_type_for (TREE_TYPE (arg0
));
11816 tree newmod
= fold_build2_loc (loc
, TREE_CODE (arg0
), newtype
,
11817 fold_convert_loc (loc
, newtype
,
11818 TREE_OPERAND (arg0
, 0)),
11819 fold_convert_loc (loc
, newtype
,
11820 TREE_OPERAND (arg0
, 1)));
11822 return fold_build2_loc (loc
, code
, type
, newmod
,
11823 fold_convert_loc (loc
, newtype
, arg1
));
11826 /* Fold ((X >> C1) & C2) == 0 and ((X >> C1) & C2) != 0 where
11827 C1 is a valid shift constant, and C2 is a power of two, i.e.
11829 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11830 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == RSHIFT_EXPR
11831 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1))
11833 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11834 && integer_zerop (arg1
))
11836 tree itype
= TREE_TYPE (arg0
);
11837 tree arg001
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1);
11838 prec
= TYPE_PRECISION (itype
);
11840 /* Check for a valid shift count. */
11841 if (wi::ltu_p (arg001
, prec
))
11843 tree arg01
= TREE_OPERAND (arg0
, 1);
11844 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
11845 unsigned HOST_WIDE_INT log2
= tree_log2 (arg01
);
11846 /* If (C2 << C1) doesn't overflow, then ((X >> C1) & C2) != 0
11847 can be rewritten as (X & (C2 << C1)) != 0. */
11848 if ((log2
+ TREE_INT_CST_LOW (arg001
)) < prec
)
11850 tem
= fold_build2_loc (loc
, LSHIFT_EXPR
, itype
, arg01
, arg001
);
11851 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, arg000
, tem
);
11852 return fold_build2_loc (loc
, code
, type
, tem
,
11853 fold_convert_loc (loc
, itype
, arg1
));
11855 /* Otherwise, for signed (arithmetic) shifts,
11856 ((X >> C1) & C2) != 0 is rewritten as X < 0, and
11857 ((X >> C1) & C2) == 0 is rewritten as X >= 0. */
11858 else if (!TYPE_UNSIGNED (itype
))
11859 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
, type
,
11860 arg000
, build_int_cst (itype
, 0));
11861 /* Otherwise, of unsigned (logical) shifts,
11862 ((X >> C1) & C2) != 0 is rewritten as (X,false), and
11863 ((X >> C1) & C2) == 0 is rewritten as (X,true). */
11865 return omit_one_operand_loc (loc
, type
,
11866 code
== EQ_EXPR
? integer_one_node
11867 : integer_zero_node
,
11872 /* If we have (A & C) == C where C is a power of 2, convert this into
11873 (A & C) != 0. Similarly for NE_EXPR. */
11874 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11875 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11876 && operand_equal_p (TREE_OPERAND (arg0
, 1), arg1
, 0))
11877 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11878 arg0
, fold_convert_loc (loc
, TREE_TYPE (arg0
),
11879 integer_zero_node
));
11881 /* If we have (A & C) != 0 or (A & C) == 0 and C is the sign
11882 bit, then fold the expression into A < 0 or A >= 0. */
11883 tem
= fold_single_bit_test_into_sign_test (loc
, code
, arg0
, arg1
, type
);
11887 /* If we have (A & C) == D where D & ~C != 0, convert this into 0.
11888 Similarly for NE_EXPR. */
11889 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11890 && TREE_CODE (arg1
) == INTEGER_CST
11891 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11893 tree notc
= fold_build1_loc (loc
, BIT_NOT_EXPR
,
11894 TREE_TYPE (TREE_OPERAND (arg0
, 1)),
11895 TREE_OPERAND (arg0
, 1));
11897 = fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
),
11898 fold_convert_loc (loc
, TREE_TYPE (arg0
), arg1
),
11900 tree rslt
= code
== EQ_EXPR
? integer_zero_node
: integer_one_node
;
11901 if (integer_nonzerop (dandnotc
))
11902 return omit_one_operand_loc (loc
, type
, rslt
, arg0
);
11905 /* If this is a comparison of a field, we may be able to simplify it. */
11906 if ((TREE_CODE (arg0
) == COMPONENT_REF
11907 || TREE_CODE (arg0
) == BIT_FIELD_REF
)
11908 /* Handle the constant case even without -O
11909 to make sure the warnings are given. */
11910 && (optimize
|| TREE_CODE (arg1
) == INTEGER_CST
))
11912 t1
= optimize_bit_field_compare (loc
, code
, type
, arg0
, arg1
);
11917 /* Optimize comparisons of strlen vs zero to a compare of the
11918 first character of the string vs zero. To wit,
11919 strlen(ptr) == 0 => *ptr == 0
11920 strlen(ptr) != 0 => *ptr != 0
11921 Other cases should reduce to one of these two (or a constant)
11922 due to the return value of strlen being unsigned. */
11923 if (TREE_CODE (arg0
) == CALL_EXPR
11924 && integer_zerop (arg1
))
11926 tree fndecl
= get_callee_fndecl (arg0
);
11929 && DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
11930 && DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_STRLEN
11931 && call_expr_nargs (arg0
) == 1
11932 && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (arg0
, 0))) == POINTER_TYPE
)
11934 tree iref
= build_fold_indirect_ref_loc (loc
,
11935 CALL_EXPR_ARG (arg0
, 0));
11936 return fold_build2_loc (loc
, code
, type
, iref
,
11937 build_int_cst (TREE_TYPE (iref
), 0));
11941 /* Fold (X >> C) != 0 into X < 0 if C is one less than the width
11942 of X. Similarly fold (X >> C) == 0 into X >= 0. */
11943 if (TREE_CODE (arg0
) == RSHIFT_EXPR
11944 && integer_zerop (arg1
)
11945 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11947 tree arg00
= TREE_OPERAND (arg0
, 0);
11948 tree arg01
= TREE_OPERAND (arg0
, 1);
11949 tree itype
= TREE_TYPE (arg00
);
11950 if (wi::eq_p (arg01
, element_precision (itype
) - 1))
11952 if (TYPE_UNSIGNED (itype
))
11954 itype
= signed_type_for (itype
);
11955 arg00
= fold_convert_loc (loc
, itype
, arg00
);
11957 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
11958 type
, arg00
, build_zero_cst (itype
));
11962 /* Fold (~X & C) == 0 into (X & C) != 0 and (~X & C) != 0 into
11963 (X & C) == 0 when C is a single bit. */
11964 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11965 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_NOT_EXPR
11966 && integer_zerop (arg1
)
11967 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
11969 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
),
11970 TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0),
11971 TREE_OPERAND (arg0
, 1));
11972 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
,
11974 fold_convert_loc (loc
, TREE_TYPE (arg0
),
11978 /* Fold ((X & C) ^ C) eq/ne 0 into (X & C) ne/eq 0, when the
11979 constant C is a power of two, i.e. a single bit. */
11980 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11981 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
11982 && integer_zerop (arg1
)
11983 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11984 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11985 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
11987 tree arg00
= TREE_OPERAND (arg0
, 0);
11988 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11989 arg00
, build_int_cst (TREE_TYPE (arg00
), 0));
11992 /* Likewise, fold ((X ^ C) & C) eq/ne 0 into (X & C) ne/eq 0,
11993 when is C is a power of two, i.e. a single bit. */
11994 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11995 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_XOR_EXPR
11996 && integer_zerop (arg1
)
11997 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11998 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11999 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
12001 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
12002 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg000
),
12003 arg000
, TREE_OPERAND (arg0
, 1));
12004 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
12005 tem
, build_int_cst (TREE_TYPE (tem
), 0));
12008 if (integer_zerop (arg1
)
12009 && tree_expr_nonzero_p (arg0
))
12011 tree res
= constant_boolean_node (code
==NE_EXPR
, type
);
12012 return omit_one_operand_loc (loc
, type
, res
, arg0
);
12015 /* Fold (X & C) op (Y & C) as (X ^ Y) & C op 0", and symmetries. */
12016 if (TREE_CODE (arg0
) == BIT_AND_EXPR
12017 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
12019 tree arg00
= TREE_OPERAND (arg0
, 0);
12020 tree arg01
= TREE_OPERAND (arg0
, 1);
12021 tree arg10
= TREE_OPERAND (arg1
, 0);
12022 tree arg11
= TREE_OPERAND (arg1
, 1);
12023 tree itype
= TREE_TYPE (arg0
);
12025 if (operand_equal_p (arg01
, arg11
, 0))
12026 return fold_build2_loc (loc
, code
, type
,
12027 fold_build2_loc (loc
, BIT_AND_EXPR
, itype
,
12028 fold_build2_loc (loc
,
12029 BIT_XOR_EXPR
, itype
,
12032 build_zero_cst (itype
));
12034 if (operand_equal_p (arg01
, arg10
, 0))
12035 return fold_build2_loc (loc
, code
, type
,
12036 fold_build2_loc (loc
, BIT_AND_EXPR
, itype
,
12037 fold_build2_loc (loc
,
12038 BIT_XOR_EXPR
, itype
,
12041 build_zero_cst (itype
));
12043 if (operand_equal_p (arg00
, arg11
, 0))
12044 return fold_build2_loc (loc
, code
, type
,
12045 fold_build2_loc (loc
, BIT_AND_EXPR
, itype
,
12046 fold_build2_loc (loc
,
12047 BIT_XOR_EXPR
, itype
,
12050 build_zero_cst (itype
));
12052 if (operand_equal_p (arg00
, arg10
, 0))
12053 return fold_build2_loc (loc
, code
, type
,
12054 fold_build2_loc (loc
, BIT_AND_EXPR
, itype
,
12055 fold_build2_loc (loc
,
12056 BIT_XOR_EXPR
, itype
,
12059 build_zero_cst (itype
));
12062 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
12063 && TREE_CODE (arg1
) == BIT_XOR_EXPR
)
12065 tree arg00
= TREE_OPERAND (arg0
, 0);
12066 tree arg01
= TREE_OPERAND (arg0
, 1);
12067 tree arg10
= TREE_OPERAND (arg1
, 0);
12068 tree arg11
= TREE_OPERAND (arg1
, 1);
12069 tree itype
= TREE_TYPE (arg0
);
12071 /* Optimize (X ^ Z) op (Y ^ Z) as X op Y, and symmetries.
12072 operand_equal_p guarantees no side-effects so we don't need
12073 to use omit_one_operand on Z. */
12074 if (operand_equal_p (arg01
, arg11
, 0))
12075 return fold_build2_loc (loc
, code
, type
, arg00
,
12076 fold_convert_loc (loc
, TREE_TYPE (arg00
),
12078 if (operand_equal_p (arg01
, arg10
, 0))
12079 return fold_build2_loc (loc
, code
, type
, arg00
,
12080 fold_convert_loc (loc
, TREE_TYPE (arg00
),
12082 if (operand_equal_p (arg00
, arg11
, 0))
12083 return fold_build2_loc (loc
, code
, type
, arg01
,
12084 fold_convert_loc (loc
, TREE_TYPE (arg01
),
12086 if (operand_equal_p (arg00
, arg10
, 0))
12087 return fold_build2_loc (loc
, code
, type
, arg01
,
12088 fold_convert_loc (loc
, TREE_TYPE (arg01
),
12091 /* Optimize (X ^ C1) op (Y ^ C2) as (X ^ (C1 ^ C2)) op Y. */
12092 if (TREE_CODE (arg01
) == INTEGER_CST
12093 && TREE_CODE (arg11
) == INTEGER_CST
)
12095 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
,
12096 fold_convert_loc (loc
, itype
, arg11
));
12097 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
12098 return fold_build2_loc (loc
, code
, type
, tem
,
12099 fold_convert_loc (loc
, itype
, arg10
));
12103 /* Attempt to simplify equality/inequality comparisons of complex
12104 values. Only lower the comparison if the result is known or
12105 can be simplified to a single scalar comparison. */
12106 if ((TREE_CODE (arg0
) == COMPLEX_EXPR
12107 || TREE_CODE (arg0
) == COMPLEX_CST
)
12108 && (TREE_CODE (arg1
) == COMPLEX_EXPR
12109 || TREE_CODE (arg1
) == COMPLEX_CST
))
12111 tree real0
, imag0
, real1
, imag1
;
12114 if (TREE_CODE (arg0
) == COMPLEX_EXPR
)
12116 real0
= TREE_OPERAND (arg0
, 0);
12117 imag0
= TREE_OPERAND (arg0
, 1);
12121 real0
= TREE_REALPART (arg0
);
12122 imag0
= TREE_IMAGPART (arg0
);
12125 if (TREE_CODE (arg1
) == COMPLEX_EXPR
)
12127 real1
= TREE_OPERAND (arg1
, 0);
12128 imag1
= TREE_OPERAND (arg1
, 1);
12132 real1
= TREE_REALPART (arg1
);
12133 imag1
= TREE_IMAGPART (arg1
);
12136 rcond
= fold_binary_loc (loc
, code
, type
, real0
, real1
);
12137 if (rcond
&& TREE_CODE (rcond
) == INTEGER_CST
)
12139 if (integer_zerop (rcond
))
12141 if (code
== EQ_EXPR
)
12142 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
12144 return fold_build2_loc (loc
, NE_EXPR
, type
, imag0
, imag1
);
12148 if (code
== NE_EXPR
)
12149 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
12151 return fold_build2_loc (loc
, EQ_EXPR
, type
, imag0
, imag1
);
12155 icond
= fold_binary_loc (loc
, code
, type
, imag0
, imag1
);
12156 if (icond
&& TREE_CODE (icond
) == INTEGER_CST
)
12158 if (integer_zerop (icond
))
12160 if (code
== EQ_EXPR
)
12161 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
12163 return fold_build2_loc (loc
, NE_EXPR
, type
, real0
, real1
);
12167 if (code
== NE_EXPR
)
12168 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
12170 return fold_build2_loc (loc
, EQ_EXPR
, type
, real0
, real1
);
12181 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
12182 if (tem
!= NULL_TREE
)
12185 /* Transform comparisons of the form X +- C CMP X. */
12186 if ((TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
12187 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0)
12188 && ((TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
12189 && !HONOR_SNANS (arg0
))
12190 || (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
12191 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))))
12193 tree arg01
= TREE_OPERAND (arg0
, 1);
12194 enum tree_code code0
= TREE_CODE (arg0
);
12197 if (TREE_CODE (arg01
) == REAL_CST
)
12198 is_positive
= REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg01
)) ? -1 : 1;
12200 is_positive
= tree_int_cst_sgn (arg01
);
12202 /* (X - c) > X becomes false. */
12203 if (code
== GT_EXPR
12204 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
12205 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
12207 if (TREE_CODE (arg01
) == INTEGER_CST
12208 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12209 fold_overflow_warning (("assuming signed overflow does not "
12210 "occur when assuming that (X - c) > X "
12211 "is always false"),
12212 WARN_STRICT_OVERFLOW_ALL
);
12213 return constant_boolean_node (0, type
);
12216 /* Likewise (X + c) < X becomes false. */
12217 if (code
== LT_EXPR
12218 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
12219 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
12221 if (TREE_CODE (arg01
) == INTEGER_CST
12222 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12223 fold_overflow_warning (("assuming signed overflow does not "
12224 "occur when assuming that "
12225 "(X + c) < X is always false"),
12226 WARN_STRICT_OVERFLOW_ALL
);
12227 return constant_boolean_node (0, type
);
12230 /* Convert (X - c) <= X to true. */
12231 if (!HONOR_NANS (arg1
)
12233 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
12234 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
12236 if (TREE_CODE (arg01
) == INTEGER_CST
12237 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12238 fold_overflow_warning (("assuming signed overflow does not "
12239 "occur when assuming that "
12240 "(X - c) <= X is always true"),
12241 WARN_STRICT_OVERFLOW_ALL
);
12242 return constant_boolean_node (1, type
);
12245 /* Convert (X + c) >= X to true. */
12246 if (!HONOR_NANS (arg1
)
12248 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
12249 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
12251 if (TREE_CODE (arg01
) == INTEGER_CST
12252 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12253 fold_overflow_warning (("assuming signed overflow does not "
12254 "occur when assuming that "
12255 "(X + c) >= X is always true"),
12256 WARN_STRICT_OVERFLOW_ALL
);
12257 return constant_boolean_node (1, type
);
12260 if (TREE_CODE (arg01
) == INTEGER_CST
)
12262 /* Convert X + c > X and X - c < X to true for integers. */
12263 if (code
== GT_EXPR
12264 && ((code0
== PLUS_EXPR
&& is_positive
> 0)
12265 || (code0
== MINUS_EXPR
&& is_positive
< 0)))
12267 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12268 fold_overflow_warning (("assuming signed overflow does "
12269 "not occur when assuming that "
12270 "(X + c) > X is always true"),
12271 WARN_STRICT_OVERFLOW_ALL
);
12272 return constant_boolean_node (1, type
);
12275 if (code
== LT_EXPR
12276 && ((code0
== MINUS_EXPR
&& is_positive
> 0)
12277 || (code0
== PLUS_EXPR
&& is_positive
< 0)))
12279 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12280 fold_overflow_warning (("assuming signed overflow does "
12281 "not occur when assuming that "
12282 "(X - c) < X is always true"),
12283 WARN_STRICT_OVERFLOW_ALL
);
12284 return constant_boolean_node (1, type
);
12287 /* Convert X + c <= X and X - c >= X to false for integers. */
12288 if (code
== LE_EXPR
12289 && ((code0
== PLUS_EXPR
&& is_positive
> 0)
12290 || (code0
== MINUS_EXPR
&& is_positive
< 0)))
12292 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12293 fold_overflow_warning (("assuming signed overflow does "
12294 "not occur when assuming that "
12295 "(X + c) <= X is always false"),
12296 WARN_STRICT_OVERFLOW_ALL
);
12297 return constant_boolean_node (0, type
);
12300 if (code
== GE_EXPR
12301 && ((code0
== MINUS_EXPR
&& is_positive
> 0)
12302 || (code0
== PLUS_EXPR
&& is_positive
< 0)))
12304 if (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg1
)))
12305 fold_overflow_warning (("assuming signed overflow does "
12306 "not occur when assuming that "
12307 "(X - c) >= X is always false"),
12308 WARN_STRICT_OVERFLOW_ALL
);
12309 return constant_boolean_node (0, type
);
12314 /* Comparisons with the highest or lowest possible integer of
12315 the specified precision will have known values. */
12317 tree arg1_type
= TREE_TYPE (arg1
);
12318 unsigned int prec
= TYPE_PRECISION (arg1_type
);
12320 if (TREE_CODE (arg1
) == INTEGER_CST
12321 && (INTEGRAL_TYPE_P (arg1_type
) || POINTER_TYPE_P (arg1_type
)))
12323 wide_int max
= wi::max_value (arg1_type
);
12324 wide_int signed_max
= wi::max_value (prec
, SIGNED
);
12325 wide_int min
= wi::min_value (arg1_type
);
12327 if (wi::eq_p (arg1
, max
))
12331 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
12334 return fold_build2_loc (loc
, EQ_EXPR
, type
, op0
, op1
);
12337 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
12340 return fold_build2_loc (loc
, NE_EXPR
, type
, op0
, op1
);
12342 /* The GE_EXPR and LT_EXPR cases above are not normally
12343 reached because of previous transformations. */
12348 else if (wi::eq_p (arg1
, max
- 1))
12352 arg1
= const_binop (PLUS_EXPR
, arg1
,
12353 build_int_cst (TREE_TYPE (arg1
), 1));
12354 return fold_build2_loc (loc
, EQ_EXPR
, type
,
12355 fold_convert_loc (loc
,
12356 TREE_TYPE (arg1
), arg0
),
12359 arg1
= const_binop (PLUS_EXPR
, arg1
,
12360 build_int_cst (TREE_TYPE (arg1
), 1));
12361 return fold_build2_loc (loc
, NE_EXPR
, type
,
12362 fold_convert_loc (loc
, TREE_TYPE (arg1
),
12368 else if (wi::eq_p (arg1
, min
))
12372 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
12375 return fold_build2_loc (loc
, EQ_EXPR
, type
, op0
, op1
);
12378 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
12381 return fold_build2_loc (loc
, NE_EXPR
, type
, op0
, op1
);
12386 else if (wi::eq_p (arg1
, min
+ 1))
12390 arg1
= const_binop (MINUS_EXPR
, arg1
,
12391 build_int_cst (TREE_TYPE (arg1
), 1));
12392 return fold_build2_loc (loc
, NE_EXPR
, type
,
12393 fold_convert_loc (loc
,
12394 TREE_TYPE (arg1
), arg0
),
12397 arg1
= const_binop (MINUS_EXPR
, arg1
,
12398 build_int_cst (TREE_TYPE (arg1
), 1));
12399 return fold_build2_loc (loc
, EQ_EXPR
, type
,
12400 fold_convert_loc (loc
, TREE_TYPE (arg1
),
12407 else if (wi::eq_p (arg1
, signed_max
)
12408 && TYPE_UNSIGNED (arg1_type
)
12409 /* We will flip the signedness of the comparison operator
12410 associated with the mode of arg1, so the sign bit is
12411 specified by this mode. Check that arg1 is the signed
12412 max associated with this sign bit. */
12413 && prec
== GET_MODE_PRECISION (TYPE_MODE (arg1_type
))
12414 /* signed_type does not work on pointer types. */
12415 && INTEGRAL_TYPE_P (arg1_type
))
12417 /* The following case also applies to X < signed_max+1
12418 and X >= signed_max+1 because previous transformations. */
12419 if (code
== LE_EXPR
|| code
== GT_EXPR
)
12421 tree st
= signed_type_for (arg1_type
);
12422 return fold_build2_loc (loc
,
12423 code
== LE_EXPR
? GE_EXPR
: LT_EXPR
,
12424 type
, fold_convert_loc (loc
, st
, arg0
),
12425 build_int_cst (st
, 0));
12431 /* If we are comparing an ABS_EXPR with a constant, we can
12432 convert all the cases into explicit comparisons, but they may
12433 well not be faster than doing the ABS and one comparison.
12434 But ABS (X) <= C is a range comparison, which becomes a subtraction
12435 and a comparison, and is probably faster. */
12436 if (code
== LE_EXPR
12437 && TREE_CODE (arg1
) == INTEGER_CST
12438 && TREE_CODE (arg0
) == ABS_EXPR
12439 && ! TREE_SIDE_EFFECTS (arg0
)
12440 && (0 != (tem
= negate_expr (arg1
)))
12441 && TREE_CODE (tem
) == INTEGER_CST
12442 && !TREE_OVERFLOW (tem
))
12443 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
12444 build2 (GE_EXPR
, type
,
12445 TREE_OPERAND (arg0
, 0), tem
),
12446 build2 (LE_EXPR
, type
,
12447 TREE_OPERAND (arg0
, 0), arg1
));
12449 /* Convert ABS_EXPR<x> >= 0 to true. */
12450 strict_overflow_p
= false;
12451 if (code
== GE_EXPR
12452 && (integer_zerop (arg1
)
12453 || (! HONOR_NANS (arg0
)
12454 && real_zerop (arg1
)))
12455 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
12457 if (strict_overflow_p
)
12458 fold_overflow_warning (("assuming signed overflow does not occur "
12459 "when simplifying comparison of "
12460 "absolute value and zero"),
12461 WARN_STRICT_OVERFLOW_CONDITIONAL
);
12462 return omit_one_operand_loc (loc
, type
,
12463 constant_boolean_node (true, type
),
12467 /* Convert ABS_EXPR<x> < 0 to false. */
12468 strict_overflow_p
= false;
12469 if (code
== LT_EXPR
12470 && (integer_zerop (arg1
) || real_zerop (arg1
))
12471 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
12473 if (strict_overflow_p
)
12474 fold_overflow_warning (("assuming signed overflow does not occur "
12475 "when simplifying comparison of "
12476 "absolute value and zero"),
12477 WARN_STRICT_OVERFLOW_CONDITIONAL
);
12478 return omit_one_operand_loc (loc
, type
,
12479 constant_boolean_node (false, type
),
12483 /* If X is unsigned, convert X < (1 << Y) into X >> Y == 0
12484 and similarly for >= into !=. */
12485 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
12486 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
12487 && TREE_CODE (arg1
) == LSHIFT_EXPR
12488 && integer_onep (TREE_OPERAND (arg1
, 0)))
12489 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
12490 build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
12491 TREE_OPERAND (arg1
, 1)),
12492 build_zero_cst (TREE_TYPE (arg0
)));
12494 /* Similarly for X < (cast) (1 << Y). But cast can't be narrowing,
12495 otherwise Y might be >= # of bits in X's type and thus e.g.
12496 (unsigned char) (1 << Y) for Y 15 might be 0.
12497 If the cast is widening, then 1 << Y should have unsigned type,
12498 otherwise if Y is number of bits in the signed shift type minus 1,
12499 we can't optimize this. E.g. (unsigned long long) (1 << Y) for Y
12500 31 might be 0xffffffff80000000. */
12501 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
12502 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
12503 && CONVERT_EXPR_P (arg1
)
12504 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == LSHIFT_EXPR
12505 && (element_precision (TREE_TYPE (arg1
))
12506 >= element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0))))
12507 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
12508 || (element_precision (TREE_TYPE (arg1
))
12509 == element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0)))))
12510 && integer_onep (TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0)))
12512 tem
= build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
12513 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1));
12514 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
12515 fold_convert_loc (loc
, TREE_TYPE (arg0
), tem
),
12516 build_zero_cst (TREE_TYPE (arg0
)));
12521 case UNORDERED_EXPR
:
12529 if (TREE_CODE (arg0
) == REAL_CST
&& TREE_CODE (arg1
) == REAL_CST
)
12531 t1
= fold_relational_const (code
, type
, arg0
, arg1
);
12532 if (t1
!= NULL_TREE
)
12536 /* If the first operand is NaN, the result is constant. */
12537 if (TREE_CODE (arg0
) == REAL_CST
12538 && REAL_VALUE_ISNAN (TREE_REAL_CST (arg0
))
12539 && (code
!= LTGT_EXPR
|| ! flag_trapping_math
))
12541 t1
= (code
== ORDERED_EXPR
|| code
== LTGT_EXPR
)
12542 ? integer_zero_node
12543 : integer_one_node
;
12544 return omit_one_operand_loc (loc
, type
, t1
, arg1
);
12547 /* If the second operand is NaN, the result is constant. */
12548 if (TREE_CODE (arg1
) == REAL_CST
12549 && REAL_VALUE_ISNAN (TREE_REAL_CST (arg1
))
12550 && (code
!= LTGT_EXPR
|| ! flag_trapping_math
))
12552 t1
= (code
== ORDERED_EXPR
|| code
== LTGT_EXPR
)
12553 ? integer_zero_node
12554 : integer_one_node
;
12555 return omit_one_operand_loc (loc
, type
, t1
, arg0
);
12558 /* Simplify unordered comparison of something with itself. */
12559 if ((code
== UNLE_EXPR
|| code
== UNGE_EXPR
|| code
== UNEQ_EXPR
)
12560 && operand_equal_p (arg0
, arg1
, 0))
12561 return constant_boolean_node (1, type
);
12563 if (code
== LTGT_EXPR
12564 && !flag_trapping_math
12565 && operand_equal_p (arg0
, arg1
, 0))
12566 return constant_boolean_node (0, type
);
12568 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
12570 tree targ0
= strip_float_extensions (arg0
);
12571 tree targ1
= strip_float_extensions (arg1
);
12572 tree newtype
= TREE_TYPE (targ0
);
12574 if (TYPE_PRECISION (TREE_TYPE (targ1
)) > TYPE_PRECISION (newtype
))
12575 newtype
= TREE_TYPE (targ1
);
12577 if (TYPE_PRECISION (newtype
) < TYPE_PRECISION (TREE_TYPE (arg0
)))
12578 return fold_build2_loc (loc
, code
, type
,
12579 fold_convert_loc (loc
, newtype
, targ0
),
12580 fold_convert_loc (loc
, newtype
, targ1
));
12585 case COMPOUND_EXPR
:
12586 /* When pedantic, a compound expression can be neither an lvalue
12587 nor an integer constant expression. */
12588 if (TREE_SIDE_EFFECTS (arg0
) || TREE_CONSTANT (arg1
))
12590 /* Don't let (0, 0) be null pointer constant. */
12591 tem
= integer_zerop (arg1
) ? build1 (NOP_EXPR
, type
, arg1
)
12592 : fold_convert_loc (loc
, type
, arg1
);
12593 return pedantic_non_lvalue_loc (loc
, tem
);
12596 /* An ASSERT_EXPR should never be passed to fold_binary. */
12597 gcc_unreachable ();
12601 } /* switch (code) */
12604 /* Callback for walk_tree, looking for LABEL_EXPR. Return *TP if it is
12605 a LABEL_EXPR; otherwise return NULL_TREE. Do not check the subtrees
12609 contains_label_1 (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
12611 switch (TREE_CODE (*tp
))
12617 *walk_subtrees
= 0;
12619 /* ... fall through ... */
12626 /* Return whether the sub-tree ST contains a label which is accessible from
12627 outside the sub-tree. */
12630 contains_label_p (tree st
)
12633 (walk_tree_without_duplicates (&st
, contains_label_1
, NULL
) != NULL_TREE
);
12636 /* Fold a ternary expression of code CODE and type TYPE with operands
12637 OP0, OP1, and OP2. Return the folded expression if folding is
12638 successful. Otherwise, return NULL_TREE. */
12641 fold_ternary_loc (location_t loc
, enum tree_code code
, tree type
,
12642 tree op0
, tree op1
, tree op2
)
12645 tree arg0
= NULL_TREE
, arg1
= NULL_TREE
, arg2
= NULL_TREE
;
12646 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
12648 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
12649 && TREE_CODE_LENGTH (code
) == 3);
12651 /* If this is a commutative operation, and OP0 is a constant, move it
12652 to OP1 to reduce the number of tests below. */
12653 if (commutative_ternary_tree_code (code
)
12654 && tree_swap_operands_p (op0
, op1
, true))
12655 return fold_build3_loc (loc
, code
, type
, op1
, op0
, op2
);
12657 tem
= generic_simplify (loc
, code
, type
, op0
, op1
, op2
);
12661 /* Strip any conversions that don't change the mode. This is safe
12662 for every expression, except for a comparison expression because
12663 its signedness is derived from its operands. So, in the latter
12664 case, only strip conversions that don't change the signedness.
12666 Note that this is done as an internal manipulation within the
12667 constant folder, in order to find the simplest representation of
12668 the arguments so that their form can be studied. In any cases,
12669 the appropriate type conversions should be put back in the tree
12670 that will get out of the constant folder. */
12691 case COMPONENT_REF
:
12692 if (TREE_CODE (arg0
) == CONSTRUCTOR
12693 && ! type_contains_placeholder_p (TREE_TYPE (arg0
)))
12695 unsigned HOST_WIDE_INT idx
;
12697 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg0
), idx
, field
, value
)
12704 case VEC_COND_EXPR
:
12705 /* Pedantic ANSI C says that a conditional expression is never an lvalue,
12706 so all simple results must be passed through pedantic_non_lvalue. */
12707 if (TREE_CODE (arg0
) == INTEGER_CST
)
12709 tree unused_op
= integer_zerop (arg0
) ? op1
: op2
;
12710 tem
= integer_zerop (arg0
) ? op2
: op1
;
12711 /* Only optimize constant conditions when the selected branch
12712 has the same type as the COND_EXPR. This avoids optimizing
12713 away "c ? x : throw", where the throw has a void type.
12714 Avoid throwing away that operand which contains label. */
12715 if ((!TREE_SIDE_EFFECTS (unused_op
)
12716 || !contains_label_p (unused_op
))
12717 && (! VOID_TYPE_P (TREE_TYPE (tem
))
12718 || VOID_TYPE_P (type
)))
12719 return pedantic_non_lvalue_loc (loc
, tem
);
12722 else if (TREE_CODE (arg0
) == VECTOR_CST
)
12724 if ((TREE_CODE (arg1
) == VECTOR_CST
12725 || TREE_CODE (arg1
) == CONSTRUCTOR
)
12726 && (TREE_CODE (arg2
) == VECTOR_CST
12727 || TREE_CODE (arg2
) == CONSTRUCTOR
))
12729 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
;
12730 unsigned char *sel
= XALLOCAVEC (unsigned char, nelts
);
12731 gcc_assert (nelts
== VECTOR_CST_NELTS (arg0
));
12732 for (i
= 0; i
< nelts
; i
++)
12734 tree val
= VECTOR_CST_ELT (arg0
, i
);
12735 if (integer_all_onesp (val
))
12737 else if (integer_zerop (val
))
12738 sel
[i
] = nelts
+ i
;
12739 else /* Currently unreachable. */
12742 tree t
= fold_vec_perm (type
, arg1
, arg2
, sel
);
12743 if (t
!= NULL_TREE
)
12748 /* If we have A op B ? A : C, we may be able to convert this to a
12749 simpler expression, depending on the operation and the values
12750 of B and C. Signed zeros prevent all of these transformations,
12751 for reasons given above each one.
12753 Also try swapping the arguments and inverting the conditional. */
12754 if (COMPARISON_CLASS_P (arg0
)
12755 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0),
12756 arg1
, TREE_OPERAND (arg0
, 1))
12757 && !HONOR_SIGNED_ZEROS (element_mode (arg1
)))
12759 tem
= fold_cond_expr_with_comparison (loc
, type
, arg0
, op1
, op2
);
12764 if (COMPARISON_CLASS_P (arg0
)
12765 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0),
12767 TREE_OPERAND (arg0
, 1))
12768 && !HONOR_SIGNED_ZEROS (element_mode (op2
)))
12770 location_t loc0
= expr_location_or (arg0
, loc
);
12771 tem
= fold_invert_truthvalue (loc0
, arg0
);
12772 if (tem
&& COMPARISON_CLASS_P (tem
))
12774 tem
= fold_cond_expr_with_comparison (loc
, type
, tem
, op2
, op1
);
12780 /* If the second operand is simpler than the third, swap them
12781 since that produces better jump optimization results. */
12782 if (truth_value_p (TREE_CODE (arg0
))
12783 && tree_swap_operands_p (op1
, op2
, false))
12785 location_t loc0
= expr_location_or (arg0
, loc
);
12786 /* See if this can be inverted. If it can't, possibly because
12787 it was a floating-point inequality comparison, don't do
12789 tem
= fold_invert_truthvalue (loc0
, arg0
);
12791 return fold_build3_loc (loc
, code
, type
, tem
, op2
, op1
);
12794 /* Convert A ? 1 : 0 to simply A. */
12795 if ((code
== VEC_COND_EXPR
? integer_all_onesp (op1
)
12796 : (integer_onep (op1
)
12797 && !VECTOR_TYPE_P (type
)))
12798 && integer_zerop (op2
)
12799 /* If we try to convert OP0 to our type, the
12800 call to fold will try to move the conversion inside
12801 a COND, which will recurse. In that case, the COND_EXPR
12802 is probably the best choice, so leave it alone. */
12803 && type
== TREE_TYPE (arg0
))
12804 return pedantic_non_lvalue_loc (loc
, arg0
);
12806 /* Convert A ? 0 : 1 to !A. This prefers the use of NOT_EXPR
12807 over COND_EXPR in cases such as floating point comparisons. */
12808 if (integer_zerop (op1
)
12809 && (code
== VEC_COND_EXPR
? integer_all_onesp (op2
)
12810 : (integer_onep (op2
)
12811 && !VECTOR_TYPE_P (type
)))
12812 && truth_value_p (TREE_CODE (arg0
)))
12813 return pedantic_non_lvalue_loc (loc
,
12814 fold_convert_loc (loc
, type
,
12815 invert_truthvalue_loc (loc
,
12818 /* A < 0 ? <sign bit of A> : 0 is simply (A & <sign bit of A>). */
12819 if (TREE_CODE (arg0
) == LT_EXPR
12820 && integer_zerop (TREE_OPERAND (arg0
, 1))
12821 && integer_zerop (op2
)
12822 && (tem
= sign_bit_p (TREE_OPERAND (arg0
, 0), arg1
)))
12824 /* sign_bit_p looks through both zero and sign extensions,
12825 but for this optimization only sign extensions are
12827 tree tem2
= TREE_OPERAND (arg0
, 0);
12828 while (tem
!= tem2
)
12830 if (TREE_CODE (tem2
) != NOP_EXPR
12831 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (tem2
, 0))))
12836 tem2
= TREE_OPERAND (tem2
, 0);
12838 /* sign_bit_p only checks ARG1 bits within A's precision.
12839 If <sign bit of A> has wider type than A, bits outside
12840 of A's precision in <sign bit of A> need to be checked.
12841 If they are all 0, this optimization needs to be done
12842 in unsigned A's type, if they are all 1 in signed A's type,
12843 otherwise this can't be done. */
12845 && TYPE_PRECISION (TREE_TYPE (tem
))
12846 < TYPE_PRECISION (TREE_TYPE (arg1
))
12847 && TYPE_PRECISION (TREE_TYPE (tem
))
12848 < TYPE_PRECISION (type
))
12850 int inner_width
, outer_width
;
12853 inner_width
= TYPE_PRECISION (TREE_TYPE (tem
));
12854 outer_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
12855 if (outer_width
> TYPE_PRECISION (type
))
12856 outer_width
= TYPE_PRECISION (type
);
12858 wide_int mask
= wi::shifted_mask
12859 (inner_width
, outer_width
- inner_width
, false,
12860 TYPE_PRECISION (TREE_TYPE (arg1
)));
12862 wide_int common
= mask
& arg1
;
12863 if (common
== mask
)
12865 tem_type
= signed_type_for (TREE_TYPE (tem
));
12866 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12868 else if (common
== 0)
12870 tem_type
= unsigned_type_for (TREE_TYPE (tem
));
12871 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12879 fold_convert_loc (loc
, type
,
12880 fold_build2_loc (loc
, BIT_AND_EXPR
,
12881 TREE_TYPE (tem
), tem
,
12882 fold_convert_loc (loc
,
12887 /* (A >> N) & 1 ? (1 << N) : 0 is simply A & (1 << N). A & 1 was
12888 already handled above. */
12889 if (TREE_CODE (arg0
) == BIT_AND_EXPR
12890 && integer_onep (TREE_OPERAND (arg0
, 1))
12891 && integer_zerop (op2
)
12892 && integer_pow2p (arg1
))
12894 tree tem
= TREE_OPERAND (arg0
, 0);
12896 if (TREE_CODE (tem
) == RSHIFT_EXPR
12897 && tree_fits_uhwi_p (TREE_OPERAND (tem
, 1))
12898 && (unsigned HOST_WIDE_INT
) tree_log2 (arg1
) ==
12899 tree_to_uhwi (TREE_OPERAND (tem
, 1)))
12900 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
12901 TREE_OPERAND (tem
, 0), arg1
);
12904 /* A & N ? N : 0 is simply A & N if N is a power of two. This
12905 is probably obsolete because the first operand should be a
12906 truth value (that's why we have the two cases above), but let's
12907 leave it in until we can confirm this for all front-ends. */
12908 if (integer_zerop (op2
)
12909 && TREE_CODE (arg0
) == NE_EXPR
12910 && integer_zerop (TREE_OPERAND (arg0
, 1))
12911 && integer_pow2p (arg1
)
12912 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
12913 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
12914 arg1
, OEP_ONLY_CONST
))
12915 return pedantic_non_lvalue_loc (loc
,
12916 fold_convert_loc (loc
, type
,
12917 TREE_OPERAND (arg0
, 0)));
12919 /* Disable the transformations below for vectors, since
12920 fold_binary_op_with_conditional_arg may undo them immediately,
12921 yielding an infinite loop. */
12922 if (code
== VEC_COND_EXPR
)
12925 /* Convert A ? B : 0 into A && B if A and B are truth values. */
12926 if (integer_zerop (op2
)
12927 && truth_value_p (TREE_CODE (arg0
))
12928 && truth_value_p (TREE_CODE (arg1
))
12929 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12930 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
? BIT_AND_EXPR
12931 : TRUTH_ANDIF_EXPR
,
12932 type
, fold_convert_loc (loc
, type
, arg0
), arg1
);
12934 /* Convert A ? B : 1 into !A || B if A and B are truth values. */
12935 if (code
== VEC_COND_EXPR
? integer_all_onesp (op2
) : integer_onep (op2
)
12936 && truth_value_p (TREE_CODE (arg0
))
12937 && truth_value_p (TREE_CODE (arg1
))
12938 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12940 location_t loc0
= expr_location_or (arg0
, loc
);
12941 /* Only perform transformation if ARG0 is easily inverted. */
12942 tem
= fold_invert_truthvalue (loc0
, arg0
);
12944 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12947 type
, fold_convert_loc (loc
, type
, tem
),
12951 /* Convert A ? 0 : B into !A && B if A and B are truth values. */
12952 if (integer_zerop (arg1
)
12953 && truth_value_p (TREE_CODE (arg0
))
12954 && truth_value_p (TREE_CODE (op2
))
12955 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12957 location_t loc0
= expr_location_or (arg0
, loc
);
12958 /* Only perform transformation if ARG0 is easily inverted. */
12959 tem
= fold_invert_truthvalue (loc0
, arg0
);
12961 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12962 ? BIT_AND_EXPR
: TRUTH_ANDIF_EXPR
,
12963 type
, fold_convert_loc (loc
, type
, tem
),
12967 /* Convert A ? 1 : B into A || B if A and B are truth values. */
12968 if (code
== VEC_COND_EXPR
? integer_all_onesp (arg1
) : integer_onep (arg1
)
12969 && truth_value_p (TREE_CODE (arg0
))
12970 && truth_value_p (TREE_CODE (op2
))
12971 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12972 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12973 ? BIT_IOR_EXPR
: TRUTH_ORIF_EXPR
,
12974 type
, fold_convert_loc (loc
, type
, arg0
), op2
);
12979 /* CALL_EXPRs used to be ternary exprs. Catch any mistaken uses
12980 of fold_ternary on them. */
12981 gcc_unreachable ();
12983 case BIT_FIELD_REF
:
12984 if ((TREE_CODE (arg0
) == VECTOR_CST
12985 || (TREE_CODE (arg0
) == CONSTRUCTOR
12986 && TREE_CODE (TREE_TYPE (arg0
)) == VECTOR_TYPE
))
12987 && (type
== TREE_TYPE (TREE_TYPE (arg0
))
12988 || (TREE_CODE (type
) == VECTOR_TYPE
12989 && TREE_TYPE (type
) == TREE_TYPE (TREE_TYPE (arg0
)))))
12991 tree eltype
= TREE_TYPE (TREE_TYPE (arg0
));
12992 unsigned HOST_WIDE_INT width
= tree_to_uhwi (TYPE_SIZE (eltype
));
12993 unsigned HOST_WIDE_INT n
= tree_to_uhwi (arg1
);
12994 unsigned HOST_WIDE_INT idx
= tree_to_uhwi (op2
);
12997 && (idx
% width
) == 0
12998 && (n
% width
) == 0
12999 && ((idx
+ n
) / width
) <= TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)))
13004 if (TREE_CODE (arg0
) == VECTOR_CST
)
13007 return VECTOR_CST_ELT (arg0
, idx
);
13009 tree
*vals
= XALLOCAVEC (tree
, n
);
13010 for (unsigned i
= 0; i
< n
; ++i
)
13011 vals
[i
] = VECTOR_CST_ELT (arg0
, idx
+ i
);
13012 return build_vector (type
, vals
);
13015 /* Constructor elements can be subvectors. */
13016 unsigned HOST_WIDE_INT k
= 1;
13017 if (CONSTRUCTOR_NELTS (arg0
) != 0)
13019 tree cons_elem
= TREE_TYPE (CONSTRUCTOR_ELT (arg0
, 0)->value
);
13020 if (TREE_CODE (cons_elem
) == VECTOR_TYPE
)
13021 k
= TYPE_VECTOR_SUBPARTS (cons_elem
);
13024 /* We keep an exact subset of the constructor elements. */
13025 if ((idx
% k
) == 0 && (n
% k
) == 0)
13027 if (CONSTRUCTOR_NELTS (arg0
) == 0)
13028 return build_constructor (type
, NULL
);
13033 if (idx
< CONSTRUCTOR_NELTS (arg0
))
13034 return CONSTRUCTOR_ELT (arg0
, idx
)->value
;
13035 return build_zero_cst (type
);
13038 vec
<constructor_elt
, va_gc
> *vals
;
13039 vec_alloc (vals
, n
);
13040 for (unsigned i
= 0;
13041 i
< n
&& idx
+ i
< CONSTRUCTOR_NELTS (arg0
);
13043 CONSTRUCTOR_APPEND_ELT (vals
, NULL_TREE
,
13045 (arg0
, idx
+ i
)->value
);
13046 return build_constructor (type
, vals
);
13048 /* The bitfield references a single constructor element. */
13049 else if (idx
+ n
<= (idx
/ k
+ 1) * k
)
13051 if (CONSTRUCTOR_NELTS (arg0
) <= idx
/ k
)
13052 return build_zero_cst (type
);
13054 return CONSTRUCTOR_ELT (arg0
, idx
/ k
)->value
;
13056 return fold_build3_loc (loc
, code
, type
,
13057 CONSTRUCTOR_ELT (arg0
, idx
/ k
)->value
, op1
,
13058 build_int_cst (TREE_TYPE (op2
), (idx
% k
) * width
));
13063 /* A bit-field-ref that referenced the full argument can be stripped. */
13064 if (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
13065 && TYPE_PRECISION (TREE_TYPE (arg0
)) == tree_to_uhwi (arg1
)
13066 && integer_zerop (op2
))
13067 return fold_convert_loc (loc
, type
, arg0
);
13069 /* On constants we can use native encode/interpret to constant
13070 fold (nearly) all BIT_FIELD_REFs. */
13071 if (CONSTANT_CLASS_P (arg0
)
13072 && can_native_interpret_type_p (type
)
13073 && tree_fits_uhwi_p (TYPE_SIZE_UNIT (TREE_TYPE (arg0
)))
13074 /* This limitation should not be necessary, we just need to
13075 round this up to mode size. */
13076 && tree_to_uhwi (op1
) % BITS_PER_UNIT
== 0
13077 /* Need bit-shifting of the buffer to relax the following. */
13078 && tree_to_uhwi (op2
) % BITS_PER_UNIT
== 0)
13080 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
13081 unsigned HOST_WIDE_INT bitsize
= tree_to_uhwi (op1
);
13082 unsigned HOST_WIDE_INT clen
;
13083 clen
= tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (arg0
)));
13084 /* ??? We cannot tell native_encode_expr to start at
13085 some random byte only. So limit us to a reasonable amount
13089 unsigned char *b
= XALLOCAVEC (unsigned char, clen
);
13090 unsigned HOST_WIDE_INT len
= native_encode_expr (arg0
, b
, clen
);
13092 && len
* BITS_PER_UNIT
>= bitpos
+ bitsize
)
13094 tree v
= native_interpret_expr (type
,
13095 b
+ bitpos
/ BITS_PER_UNIT
,
13096 bitsize
/ BITS_PER_UNIT
);
13106 /* For integers we can decompose the FMA if possible. */
13107 if (TREE_CODE (arg0
) == INTEGER_CST
13108 && TREE_CODE (arg1
) == INTEGER_CST
)
13109 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
13110 const_binop (MULT_EXPR
, arg0
, arg1
), arg2
);
13111 if (integer_zerop (arg2
))
13112 return fold_build2_loc (loc
, MULT_EXPR
, type
, arg0
, arg1
);
13114 return fold_fma (loc
, type
, arg0
, arg1
, arg2
);
13116 case VEC_PERM_EXPR
:
13117 if (TREE_CODE (arg2
) == VECTOR_CST
)
13119 unsigned int nelts
= TYPE_VECTOR_SUBPARTS (type
), i
, mask
, mask2
;
13120 unsigned char *sel
= XALLOCAVEC (unsigned char, 2 * nelts
);
13121 unsigned char *sel2
= sel
+ nelts
;
13122 bool need_mask_canon
= false;
13123 bool need_mask_canon2
= false;
13124 bool all_in_vec0
= true;
13125 bool all_in_vec1
= true;
13126 bool maybe_identity
= true;
13127 bool single_arg
= (op0
== op1
);
13128 bool changed
= false;
13130 mask2
= 2 * nelts
- 1;
13131 mask
= single_arg
? (nelts
- 1) : mask2
;
13132 gcc_assert (nelts
== VECTOR_CST_NELTS (arg2
));
13133 for (i
= 0; i
< nelts
; i
++)
13135 tree val
= VECTOR_CST_ELT (arg2
, i
);
13136 if (TREE_CODE (val
) != INTEGER_CST
)
13139 /* Make sure that the perm value is in an acceptable
13142 need_mask_canon
|= wi::gtu_p (t
, mask
);
13143 need_mask_canon2
|= wi::gtu_p (t
, mask2
);
13144 sel
[i
] = t
.to_uhwi () & mask
;
13145 sel2
[i
] = t
.to_uhwi () & mask2
;
13147 if (sel
[i
] < nelts
)
13148 all_in_vec1
= false;
13150 all_in_vec0
= false;
13152 if ((sel
[i
] & (nelts
-1)) != i
)
13153 maybe_identity
= false;
13156 if (maybe_identity
)
13166 else if (all_in_vec1
)
13169 for (i
= 0; i
< nelts
; i
++)
13171 need_mask_canon
= true;
13174 if ((TREE_CODE (op0
) == VECTOR_CST
13175 || TREE_CODE (op0
) == CONSTRUCTOR
)
13176 && (TREE_CODE (op1
) == VECTOR_CST
13177 || TREE_CODE (op1
) == CONSTRUCTOR
))
13179 tree t
= fold_vec_perm (type
, op0
, op1
, sel
);
13180 if (t
!= NULL_TREE
)
13184 if (op0
== op1
&& !single_arg
)
13187 /* Some targets are deficient and fail to expand a single
13188 argument permutation while still allowing an equivalent
13189 2-argument version. */
13190 if (need_mask_canon
&& arg2
== op2
13191 && !can_vec_perm_p (TYPE_MODE (type
), false, sel
)
13192 && can_vec_perm_p (TYPE_MODE (type
), false, sel2
))
13194 need_mask_canon
= need_mask_canon2
;
13198 if (need_mask_canon
&& arg2
== op2
)
13200 tree
*tsel
= XALLOCAVEC (tree
, nelts
);
13201 tree eltype
= TREE_TYPE (TREE_TYPE (arg2
));
13202 for (i
= 0; i
< nelts
; i
++)
13203 tsel
[i
] = build_int_cst (eltype
, sel
[i
]);
13204 op2
= build_vector (TREE_TYPE (arg2
), tsel
);
13209 return build3_loc (loc
, VEC_PERM_EXPR
, type
, op0
, op1
, op2
);
13215 } /* switch (code) */
13218 /* Perform constant folding and related simplification of EXPR.
13219 The related simplifications include x*1 => x, x*0 => 0, etc.,
13220 and application of the associative law.
13221 NOP_EXPR conversions may be removed freely (as long as we
13222 are careful not to change the type of the overall expression).
13223 We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR,
13224 but we can constant-fold them if they have constant operands. */
13226 #ifdef ENABLE_FOLD_CHECKING
13227 # define fold(x) fold_1 (x)
13228 static tree
fold_1 (tree
);
13234 const tree t
= expr
;
13235 enum tree_code code
= TREE_CODE (t
);
13236 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
13238 location_t loc
= EXPR_LOCATION (expr
);
13240 /* Return right away if a constant. */
13241 if (kind
== tcc_constant
)
13244 /* CALL_EXPR-like objects with variable numbers of operands are
13245 treated specially. */
13246 if (kind
== tcc_vl_exp
)
13248 if (code
== CALL_EXPR
)
13250 tem
= fold_call_expr (loc
, expr
, false);
13251 return tem
? tem
: expr
;
13256 if (IS_EXPR_CODE_CLASS (kind
))
13258 tree type
= TREE_TYPE (t
);
13259 tree op0
, op1
, op2
;
13261 switch (TREE_CODE_LENGTH (code
))
13264 op0
= TREE_OPERAND (t
, 0);
13265 tem
= fold_unary_loc (loc
, code
, type
, op0
);
13266 return tem
? tem
: expr
;
13268 op0
= TREE_OPERAND (t
, 0);
13269 op1
= TREE_OPERAND (t
, 1);
13270 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
13271 return tem
? tem
: expr
;
13273 op0
= TREE_OPERAND (t
, 0);
13274 op1
= TREE_OPERAND (t
, 1);
13275 op2
= TREE_OPERAND (t
, 2);
13276 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
13277 return tem
? tem
: expr
;
13287 tree op0
= TREE_OPERAND (t
, 0);
13288 tree op1
= TREE_OPERAND (t
, 1);
13290 if (TREE_CODE (op1
) == INTEGER_CST
13291 && TREE_CODE (op0
) == CONSTRUCTOR
13292 && ! type_contains_placeholder_p (TREE_TYPE (op0
)))
13294 vec
<constructor_elt
, va_gc
> *elts
= CONSTRUCTOR_ELTS (op0
);
13295 unsigned HOST_WIDE_INT end
= vec_safe_length (elts
);
13296 unsigned HOST_WIDE_INT begin
= 0;
13298 /* Find a matching index by means of a binary search. */
13299 while (begin
!= end
)
13301 unsigned HOST_WIDE_INT middle
= (begin
+ end
) / 2;
13302 tree index
= (*elts
)[middle
].index
;
13304 if (TREE_CODE (index
) == INTEGER_CST
13305 && tree_int_cst_lt (index
, op1
))
13306 begin
= middle
+ 1;
13307 else if (TREE_CODE (index
) == INTEGER_CST
13308 && tree_int_cst_lt (op1
, index
))
13310 else if (TREE_CODE (index
) == RANGE_EXPR
13311 && tree_int_cst_lt (TREE_OPERAND (index
, 1), op1
))
13312 begin
= middle
+ 1;
13313 else if (TREE_CODE (index
) == RANGE_EXPR
13314 && tree_int_cst_lt (op1
, TREE_OPERAND (index
, 0)))
13317 return (*elts
)[middle
].value
;
13324 /* Return a VECTOR_CST if possible. */
13327 tree type
= TREE_TYPE (t
);
13328 if (TREE_CODE (type
) != VECTOR_TYPE
)
13331 tree
*vec
= XALLOCAVEC (tree
, TYPE_VECTOR_SUBPARTS (type
));
13332 unsigned HOST_WIDE_INT idx
, pos
= 0;
13335 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t
), idx
, value
)
13337 if (!CONSTANT_CLASS_P (value
))
13339 if (TREE_CODE (value
) == VECTOR_CST
)
13341 for (unsigned i
= 0; i
< VECTOR_CST_NELTS (value
); ++i
)
13342 vec
[pos
++] = VECTOR_CST_ELT (value
, i
);
13345 vec
[pos
++] = value
;
13347 for (; pos
< TYPE_VECTOR_SUBPARTS (type
); ++pos
)
13348 vec
[pos
] = build_zero_cst (TREE_TYPE (type
));
13350 return build_vector (type
, vec
);
13354 return fold (DECL_INITIAL (t
));
13358 } /* switch (code) */
13361 #ifdef ENABLE_FOLD_CHECKING
13364 static void fold_checksum_tree (const_tree
, struct md5_ctx
*,
13365 hash_table
<nofree_ptr_hash
<const tree_node
> > *);
13366 static void fold_check_failed (const_tree
, const_tree
);
13367 void print_fold_checksum (const_tree
);
13369 /* When --enable-checking=fold, compute a digest of expr before
13370 and after actual fold call to see if fold did not accidentally
13371 change original expr. */
13377 struct md5_ctx ctx
;
13378 unsigned char checksum_before
[16], checksum_after
[16];
13379 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13381 md5_init_ctx (&ctx
);
13382 fold_checksum_tree (expr
, &ctx
, &ht
);
13383 md5_finish_ctx (&ctx
, checksum_before
);
13386 ret
= fold_1 (expr
);
13388 md5_init_ctx (&ctx
);
13389 fold_checksum_tree (expr
, &ctx
, &ht
);
13390 md5_finish_ctx (&ctx
, checksum_after
);
13392 if (memcmp (checksum_before
, checksum_after
, 16))
13393 fold_check_failed (expr
, ret
);
13399 print_fold_checksum (const_tree expr
)
13401 struct md5_ctx ctx
;
13402 unsigned char checksum
[16], cnt
;
13403 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13405 md5_init_ctx (&ctx
);
13406 fold_checksum_tree (expr
, &ctx
, &ht
);
13407 md5_finish_ctx (&ctx
, checksum
);
13408 for (cnt
= 0; cnt
< 16; ++cnt
)
13409 fprintf (stderr
, "%02x", checksum
[cnt
]);
13410 putc ('\n', stderr
);
13414 fold_check_failed (const_tree expr ATTRIBUTE_UNUSED
, const_tree ret ATTRIBUTE_UNUSED
)
13416 internal_error ("fold check: original tree changed by fold");
13420 fold_checksum_tree (const_tree expr
, struct md5_ctx
*ctx
,
13421 hash_table
<nofree_ptr_hash
<const tree_node
> > *ht
)
13423 const tree_node
**slot
;
13424 enum tree_code code
;
13425 union tree_node buf
;
13431 slot
= ht
->find_slot (expr
, INSERT
);
13435 code
= TREE_CODE (expr
);
13436 if (TREE_CODE_CLASS (code
) == tcc_declaration
13437 && HAS_DECL_ASSEMBLER_NAME_P (expr
))
13439 /* Allow DECL_ASSEMBLER_NAME and symtab_node to be modified. */
13440 memcpy ((char *) &buf
, expr
, tree_size (expr
));
13441 SET_DECL_ASSEMBLER_NAME ((tree
)&buf
, NULL
);
13442 buf
.decl_with_vis
.symtab_node
= NULL
;
13443 expr
= (tree
) &buf
;
13445 else if (TREE_CODE_CLASS (code
) == tcc_type
13446 && (TYPE_POINTER_TO (expr
)
13447 || TYPE_REFERENCE_TO (expr
)
13448 || TYPE_CACHED_VALUES_P (expr
)
13449 || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr
)
13450 || TYPE_NEXT_VARIANT (expr
)))
13452 /* Allow these fields to be modified. */
13454 memcpy ((char *) &buf
, expr
, tree_size (expr
));
13455 expr
= tmp
= (tree
) &buf
;
13456 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (tmp
) = 0;
13457 TYPE_POINTER_TO (tmp
) = NULL
;
13458 TYPE_REFERENCE_TO (tmp
) = NULL
;
13459 TYPE_NEXT_VARIANT (tmp
) = NULL
;
13460 if (TYPE_CACHED_VALUES_P (tmp
))
13462 TYPE_CACHED_VALUES_P (tmp
) = 0;
13463 TYPE_CACHED_VALUES (tmp
) = NULL
;
13466 md5_process_bytes (expr
, tree_size (expr
), ctx
);
13467 if (CODE_CONTAINS_STRUCT (code
, TS_TYPED
))
13468 fold_checksum_tree (TREE_TYPE (expr
), ctx
, ht
);
13469 if (TREE_CODE_CLASS (code
) != tcc_type
13470 && TREE_CODE_CLASS (code
) != tcc_declaration
13471 && code
!= TREE_LIST
13472 && code
!= SSA_NAME
13473 && CODE_CONTAINS_STRUCT (code
, TS_COMMON
))
13474 fold_checksum_tree (TREE_CHAIN (expr
), ctx
, ht
);
13475 switch (TREE_CODE_CLASS (code
))
13481 md5_process_bytes (TREE_STRING_POINTER (expr
),
13482 TREE_STRING_LENGTH (expr
), ctx
);
13485 fold_checksum_tree (TREE_REALPART (expr
), ctx
, ht
);
13486 fold_checksum_tree (TREE_IMAGPART (expr
), ctx
, ht
);
13489 for (i
= 0; i
< (int) VECTOR_CST_NELTS (expr
); ++i
)
13490 fold_checksum_tree (VECTOR_CST_ELT (expr
, i
), ctx
, ht
);
13496 case tcc_exceptional
:
13500 fold_checksum_tree (TREE_PURPOSE (expr
), ctx
, ht
);
13501 fold_checksum_tree (TREE_VALUE (expr
), ctx
, ht
);
13502 expr
= TREE_CHAIN (expr
);
13503 goto recursive_label
;
13506 for (i
= 0; i
< TREE_VEC_LENGTH (expr
); ++i
)
13507 fold_checksum_tree (TREE_VEC_ELT (expr
, i
), ctx
, ht
);
13513 case tcc_expression
:
13514 case tcc_reference
:
13515 case tcc_comparison
:
13518 case tcc_statement
:
13520 len
= TREE_OPERAND_LENGTH (expr
);
13521 for (i
= 0; i
< len
; ++i
)
13522 fold_checksum_tree (TREE_OPERAND (expr
, i
), ctx
, ht
);
13524 case tcc_declaration
:
13525 fold_checksum_tree (DECL_NAME (expr
), ctx
, ht
);
13526 fold_checksum_tree (DECL_CONTEXT (expr
), ctx
, ht
);
13527 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_COMMON
))
13529 fold_checksum_tree (DECL_SIZE (expr
), ctx
, ht
);
13530 fold_checksum_tree (DECL_SIZE_UNIT (expr
), ctx
, ht
);
13531 fold_checksum_tree (DECL_INITIAL (expr
), ctx
, ht
);
13532 fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr
), ctx
, ht
);
13533 fold_checksum_tree (DECL_ATTRIBUTES (expr
), ctx
, ht
);
13536 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_NON_COMMON
))
13538 if (TREE_CODE (expr
) == FUNCTION_DECL
)
13540 fold_checksum_tree (DECL_VINDEX (expr
), ctx
, ht
);
13541 fold_checksum_tree (DECL_ARGUMENTS (expr
), ctx
, ht
);
13543 fold_checksum_tree (DECL_RESULT_FLD (expr
), ctx
, ht
);
13547 if (TREE_CODE (expr
) == ENUMERAL_TYPE
)
13548 fold_checksum_tree (TYPE_VALUES (expr
), ctx
, ht
);
13549 fold_checksum_tree (TYPE_SIZE (expr
), ctx
, ht
);
13550 fold_checksum_tree (TYPE_SIZE_UNIT (expr
), ctx
, ht
);
13551 fold_checksum_tree (TYPE_ATTRIBUTES (expr
), ctx
, ht
);
13552 fold_checksum_tree (TYPE_NAME (expr
), ctx
, ht
);
13553 if (INTEGRAL_TYPE_P (expr
)
13554 || SCALAR_FLOAT_TYPE_P (expr
))
13556 fold_checksum_tree (TYPE_MIN_VALUE (expr
), ctx
, ht
);
13557 fold_checksum_tree (TYPE_MAX_VALUE (expr
), ctx
, ht
);
13559 fold_checksum_tree (TYPE_MAIN_VARIANT (expr
), ctx
, ht
);
13560 if (TREE_CODE (expr
) == RECORD_TYPE
13561 || TREE_CODE (expr
) == UNION_TYPE
13562 || TREE_CODE (expr
) == QUAL_UNION_TYPE
)
13563 fold_checksum_tree (TYPE_BINFO (expr
), ctx
, ht
);
13564 fold_checksum_tree (TYPE_CONTEXT (expr
), ctx
, ht
);
13571 /* Helper function for outputting the checksum of a tree T. When
13572 debugging with gdb, you can "define mynext" to be "next" followed
13573 by "call debug_fold_checksum (op0)", then just trace down till the
13576 DEBUG_FUNCTION
void
13577 debug_fold_checksum (const_tree t
)
13580 unsigned char checksum
[16];
13581 struct md5_ctx ctx
;
13582 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13584 md5_init_ctx (&ctx
);
13585 fold_checksum_tree (t
, &ctx
, &ht
);
13586 md5_finish_ctx (&ctx
, checksum
);
13589 for (i
= 0; i
< 16; i
++)
13590 fprintf (stderr
, "%d ", checksum
[i
]);
13592 fprintf (stderr
, "\n");
13597 /* Fold a unary tree expression with code CODE of type TYPE with an
13598 operand OP0. LOC is the location of the resulting expression.
13599 Return a folded expression if successful. Otherwise, return a tree
13600 expression with code CODE of type TYPE with an operand OP0. */
13603 fold_build1_stat_loc (location_t loc
,
13604 enum tree_code code
, tree type
, tree op0 MEM_STAT_DECL
)
13607 #ifdef ENABLE_FOLD_CHECKING
13608 unsigned char checksum_before
[16], checksum_after
[16];
13609 struct md5_ctx ctx
;
13610 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13612 md5_init_ctx (&ctx
);
13613 fold_checksum_tree (op0
, &ctx
, &ht
);
13614 md5_finish_ctx (&ctx
, checksum_before
);
13618 tem
= fold_unary_loc (loc
, code
, type
, op0
);
13620 tem
= build1_stat_loc (loc
, code
, type
, op0 PASS_MEM_STAT
);
13622 #ifdef ENABLE_FOLD_CHECKING
13623 md5_init_ctx (&ctx
);
13624 fold_checksum_tree (op0
, &ctx
, &ht
);
13625 md5_finish_ctx (&ctx
, checksum_after
);
13627 if (memcmp (checksum_before
, checksum_after
, 16))
13628 fold_check_failed (op0
, tem
);
13633 /* Fold a binary tree expression with code CODE of type TYPE with
13634 operands OP0 and OP1. LOC is the location of the resulting
13635 expression. Return a folded expression if successful. Otherwise,
13636 return a tree expression with code CODE of type TYPE with operands
13640 fold_build2_stat_loc (location_t loc
,
13641 enum tree_code code
, tree type
, tree op0
, tree op1
13645 #ifdef ENABLE_FOLD_CHECKING
13646 unsigned char checksum_before_op0
[16],
13647 checksum_before_op1
[16],
13648 checksum_after_op0
[16],
13649 checksum_after_op1
[16];
13650 struct md5_ctx ctx
;
13651 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13653 md5_init_ctx (&ctx
);
13654 fold_checksum_tree (op0
, &ctx
, &ht
);
13655 md5_finish_ctx (&ctx
, checksum_before_op0
);
13658 md5_init_ctx (&ctx
);
13659 fold_checksum_tree (op1
, &ctx
, &ht
);
13660 md5_finish_ctx (&ctx
, checksum_before_op1
);
13664 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
13666 tem
= build2_stat_loc (loc
, code
, type
, op0
, op1 PASS_MEM_STAT
);
13668 #ifdef ENABLE_FOLD_CHECKING
13669 md5_init_ctx (&ctx
);
13670 fold_checksum_tree (op0
, &ctx
, &ht
);
13671 md5_finish_ctx (&ctx
, checksum_after_op0
);
13674 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13675 fold_check_failed (op0
, tem
);
13677 md5_init_ctx (&ctx
);
13678 fold_checksum_tree (op1
, &ctx
, &ht
);
13679 md5_finish_ctx (&ctx
, checksum_after_op1
);
13681 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13682 fold_check_failed (op1
, tem
);
13687 /* Fold a ternary tree expression with code CODE of type TYPE with
13688 operands OP0, OP1, and OP2. Return a folded expression if
13689 successful. Otherwise, return a tree expression with code CODE of
13690 type TYPE with operands OP0, OP1, and OP2. */
13693 fold_build3_stat_loc (location_t loc
, enum tree_code code
, tree type
,
13694 tree op0
, tree op1
, tree op2 MEM_STAT_DECL
)
13697 #ifdef ENABLE_FOLD_CHECKING
13698 unsigned char checksum_before_op0
[16],
13699 checksum_before_op1
[16],
13700 checksum_before_op2
[16],
13701 checksum_after_op0
[16],
13702 checksum_after_op1
[16],
13703 checksum_after_op2
[16];
13704 struct md5_ctx ctx
;
13705 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13707 md5_init_ctx (&ctx
);
13708 fold_checksum_tree (op0
, &ctx
, &ht
);
13709 md5_finish_ctx (&ctx
, checksum_before_op0
);
13712 md5_init_ctx (&ctx
);
13713 fold_checksum_tree (op1
, &ctx
, &ht
);
13714 md5_finish_ctx (&ctx
, checksum_before_op1
);
13717 md5_init_ctx (&ctx
);
13718 fold_checksum_tree (op2
, &ctx
, &ht
);
13719 md5_finish_ctx (&ctx
, checksum_before_op2
);
13723 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
13724 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
13726 tem
= build3_stat_loc (loc
, code
, type
, op0
, op1
, op2 PASS_MEM_STAT
);
13728 #ifdef ENABLE_FOLD_CHECKING
13729 md5_init_ctx (&ctx
);
13730 fold_checksum_tree (op0
, &ctx
, &ht
);
13731 md5_finish_ctx (&ctx
, checksum_after_op0
);
13734 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13735 fold_check_failed (op0
, tem
);
13737 md5_init_ctx (&ctx
);
13738 fold_checksum_tree (op1
, &ctx
, &ht
);
13739 md5_finish_ctx (&ctx
, checksum_after_op1
);
13742 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13743 fold_check_failed (op1
, tem
);
13745 md5_init_ctx (&ctx
);
13746 fold_checksum_tree (op2
, &ctx
, &ht
);
13747 md5_finish_ctx (&ctx
, checksum_after_op2
);
13749 if (memcmp (checksum_before_op2
, checksum_after_op2
, 16))
13750 fold_check_failed (op2
, tem
);
13755 /* Fold a CALL_EXPR expression of type TYPE with operands FN and NARGS
13756 arguments in ARGARRAY, and a null static chain.
13757 Return a folded expression if successful. Otherwise, return a CALL_EXPR
13758 of type TYPE from the given operands as constructed by build_call_array. */
13761 fold_build_call_array_loc (location_t loc
, tree type
, tree fn
,
13762 int nargs
, tree
*argarray
)
13765 #ifdef ENABLE_FOLD_CHECKING
13766 unsigned char checksum_before_fn
[16],
13767 checksum_before_arglist
[16],
13768 checksum_after_fn
[16],
13769 checksum_after_arglist
[16];
13770 struct md5_ctx ctx
;
13771 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13774 md5_init_ctx (&ctx
);
13775 fold_checksum_tree (fn
, &ctx
, &ht
);
13776 md5_finish_ctx (&ctx
, checksum_before_fn
);
13779 md5_init_ctx (&ctx
);
13780 for (i
= 0; i
< nargs
; i
++)
13781 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13782 md5_finish_ctx (&ctx
, checksum_before_arglist
);
13786 tem
= fold_builtin_call_array (loc
, type
, fn
, nargs
, argarray
);
13788 tem
= build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13790 #ifdef ENABLE_FOLD_CHECKING
13791 md5_init_ctx (&ctx
);
13792 fold_checksum_tree (fn
, &ctx
, &ht
);
13793 md5_finish_ctx (&ctx
, checksum_after_fn
);
13796 if (memcmp (checksum_before_fn
, checksum_after_fn
, 16))
13797 fold_check_failed (fn
, tem
);
13799 md5_init_ctx (&ctx
);
13800 for (i
= 0; i
< nargs
; i
++)
13801 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13802 md5_finish_ctx (&ctx
, checksum_after_arglist
);
13804 if (memcmp (checksum_before_arglist
, checksum_after_arglist
, 16))
13805 fold_check_failed (NULL_TREE
, tem
);
13810 /* Perform constant folding and related simplification of initializer
13811 expression EXPR. These behave identically to "fold_buildN" but ignore
13812 potential run-time traps and exceptions that fold must preserve. */
13814 #define START_FOLD_INIT \
13815 int saved_signaling_nans = flag_signaling_nans;\
13816 int saved_trapping_math = flag_trapping_math;\
13817 int saved_rounding_math = flag_rounding_math;\
13818 int saved_trapv = flag_trapv;\
13819 int saved_folding_initializer = folding_initializer;\
13820 flag_signaling_nans = 0;\
13821 flag_trapping_math = 0;\
13822 flag_rounding_math = 0;\
13824 folding_initializer = 1;
13826 #define END_FOLD_INIT \
13827 flag_signaling_nans = saved_signaling_nans;\
13828 flag_trapping_math = saved_trapping_math;\
13829 flag_rounding_math = saved_rounding_math;\
13830 flag_trapv = saved_trapv;\
13831 folding_initializer = saved_folding_initializer;
13834 fold_build1_initializer_loc (location_t loc
, enum tree_code code
,
13835 tree type
, tree op
)
13840 result
= fold_build1_loc (loc
, code
, type
, op
);
13847 fold_build2_initializer_loc (location_t loc
, enum tree_code code
,
13848 tree type
, tree op0
, tree op1
)
13853 result
= fold_build2_loc (loc
, code
, type
, op0
, op1
);
13860 fold_build_call_array_initializer_loc (location_t loc
, tree type
, tree fn
,
13861 int nargs
, tree
*argarray
)
13866 result
= fold_build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13872 #undef START_FOLD_INIT
13873 #undef END_FOLD_INIT
13875 /* Determine if first argument is a multiple of second argument. Return 0 if
13876 it is not, or we cannot easily determined it to be.
13878 An example of the sort of thing we care about (at this point; this routine
13879 could surely be made more general, and expanded to do what the *_DIV_EXPR's
13880 fold cases do now) is discovering that
13882 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13888 when we know that the two SAVE_EXPR (J * 8) nodes are the same node.
13890 This code also handles discovering that
13892 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13894 is a multiple of 8 so we don't have to worry about dealing with a
13895 possible remainder.
13897 Note that we *look* inside a SAVE_EXPR only to determine how it was
13898 calculated; it is not safe for fold to do much of anything else with the
13899 internals of a SAVE_EXPR, since it cannot know when it will be evaluated
13900 at run time. For example, the latter example above *cannot* be implemented
13901 as SAVE_EXPR (I) * J or any variant thereof, since the value of J at
13902 evaluation time of the original SAVE_EXPR is not necessarily the same at
13903 the time the new expression is evaluated. The only optimization of this
13904 sort that would be valid is changing
13906 SAVE_EXPR (I) * SAVE_EXPR (SAVE_EXPR (J) * 8)
13910 SAVE_EXPR (I) * SAVE_EXPR (J)
13912 (where the same SAVE_EXPR (J) is used in the original and the
13913 transformed version). */
13916 multiple_of_p (tree type
, const_tree top
, const_tree bottom
)
13918 if (operand_equal_p (top
, bottom
, 0))
13921 if (TREE_CODE (type
) != INTEGER_TYPE
)
13924 switch (TREE_CODE (top
))
13927 /* Bitwise and provides a power of two multiple. If the mask is
13928 a multiple of BOTTOM then TOP is a multiple of BOTTOM. */
13929 if (!integer_pow2p (bottom
))
13934 return (multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
)
13935 || multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
));
13939 return (multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
)
13940 && multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
));
13943 if (TREE_CODE (TREE_OPERAND (top
, 1)) == INTEGER_CST
)
13947 op1
= TREE_OPERAND (top
, 1);
13948 /* const_binop may not detect overflow correctly,
13949 so check for it explicitly here. */
13950 if (wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)), op1
)
13951 && 0 != (t1
= fold_convert (type
,
13952 const_binop (LSHIFT_EXPR
,
13955 && !TREE_OVERFLOW (t1
))
13956 return multiple_of_p (type
, t1
, bottom
);
13961 /* Can't handle conversions from non-integral or wider integral type. */
13962 if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top
, 0))) != INTEGER_TYPE
)
13963 || (TYPE_PRECISION (type
)
13964 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top
, 0)))))
13967 /* .. fall through ... */
13970 return multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
);
13973 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13974 && multiple_of_p (type
, TREE_OPERAND (top
, 2), bottom
));
13977 if (TREE_CODE (bottom
) != INTEGER_CST
13978 || integer_zerop (bottom
)
13979 || (TYPE_UNSIGNED (type
)
13980 && (tree_int_cst_sgn (top
) < 0
13981 || tree_int_cst_sgn (bottom
) < 0)))
13983 return wi::multiple_of_p (wi::to_widest (top
), wi::to_widest (bottom
),
13991 /* Return true if CODE or TYPE is known to be non-negative. */
13994 tree_simple_nonnegative_warnv_p (enum tree_code code
, tree type
)
13996 if ((TYPE_PRECISION (type
) != 1 || TYPE_UNSIGNED (type
))
13997 && truth_value_p (code
))
13998 /* Truth values evaluate to 0 or 1, which is nonnegative unless we
13999 have a signed:1 type (where the value is -1 and 0). */
14004 /* Return true if (CODE OP0) is known to be non-negative. If the return
14005 value is based on the assumption that signed overflow is undefined,
14006 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14007 *STRICT_OVERFLOW_P. */
14010 tree_unary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
14011 bool *strict_overflow_p
)
14013 if (TYPE_UNSIGNED (type
))
14019 /* We can't return 1 if flag_wrapv is set because
14020 ABS_EXPR<INT_MIN> = INT_MIN. */
14021 if (!ANY_INTEGRAL_TYPE_P (type
))
14023 if (TYPE_OVERFLOW_UNDEFINED (type
))
14025 *strict_overflow_p
= true;
14030 case NON_LVALUE_EXPR
:
14032 case FIX_TRUNC_EXPR
:
14033 return tree_expr_nonnegative_warnv_p (op0
,
14034 strict_overflow_p
);
14038 tree inner_type
= TREE_TYPE (op0
);
14039 tree outer_type
= type
;
14041 if (TREE_CODE (outer_type
) == REAL_TYPE
)
14043 if (TREE_CODE (inner_type
) == REAL_TYPE
)
14044 return tree_expr_nonnegative_warnv_p (op0
,
14045 strict_overflow_p
);
14046 if (INTEGRAL_TYPE_P (inner_type
))
14048 if (TYPE_UNSIGNED (inner_type
))
14050 return tree_expr_nonnegative_warnv_p (op0
,
14051 strict_overflow_p
);
14054 else if (INTEGRAL_TYPE_P (outer_type
))
14056 if (TREE_CODE (inner_type
) == REAL_TYPE
)
14057 return tree_expr_nonnegative_warnv_p (op0
,
14058 strict_overflow_p
);
14059 if (INTEGRAL_TYPE_P (inner_type
))
14060 return TYPE_PRECISION (inner_type
) < TYPE_PRECISION (outer_type
)
14061 && TYPE_UNSIGNED (inner_type
);
14067 return tree_simple_nonnegative_warnv_p (code
, type
);
14070 /* We don't know sign of `t', so be conservative and return false. */
14074 /* Return true if (CODE OP0 OP1) is known to be non-negative. If the return
14075 value is based on the assumption that signed overflow is undefined,
14076 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14077 *STRICT_OVERFLOW_P. */
14080 tree_binary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
14081 tree op1
, bool *strict_overflow_p
)
14083 if (TYPE_UNSIGNED (type
))
14088 case POINTER_PLUS_EXPR
:
14090 if (FLOAT_TYPE_P (type
))
14091 return (tree_expr_nonnegative_warnv_p (op0
,
14093 && tree_expr_nonnegative_warnv_p (op1
,
14094 strict_overflow_p
));
14096 /* zero_extend(x) + zero_extend(y) is non-negative if x and y are
14097 both unsigned and at least 2 bits shorter than the result. */
14098 if (TREE_CODE (type
) == INTEGER_TYPE
14099 && TREE_CODE (op0
) == NOP_EXPR
14100 && TREE_CODE (op1
) == NOP_EXPR
)
14102 tree inner1
= TREE_TYPE (TREE_OPERAND (op0
, 0));
14103 tree inner2
= TREE_TYPE (TREE_OPERAND (op1
, 0));
14104 if (TREE_CODE (inner1
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner1
)
14105 && TREE_CODE (inner2
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner2
))
14107 unsigned int prec
= MAX (TYPE_PRECISION (inner1
),
14108 TYPE_PRECISION (inner2
)) + 1;
14109 return prec
< TYPE_PRECISION (type
);
14115 if (FLOAT_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
14117 /* x * x is always non-negative for floating point x
14118 or without overflow. */
14119 if (operand_equal_p (op0
, op1
, 0)
14120 || (tree_expr_nonnegative_warnv_p (op0
, strict_overflow_p
)
14121 && tree_expr_nonnegative_warnv_p (op1
, strict_overflow_p
)))
14123 if (ANY_INTEGRAL_TYPE_P (type
)
14124 && TYPE_OVERFLOW_UNDEFINED (type
))
14125 *strict_overflow_p
= true;
14130 /* zero_extend(x) * zero_extend(y) is non-negative if x and y are
14131 both unsigned and their total bits is shorter than the result. */
14132 if (TREE_CODE (type
) == INTEGER_TYPE
14133 && (TREE_CODE (op0
) == NOP_EXPR
|| TREE_CODE (op0
) == INTEGER_CST
)
14134 && (TREE_CODE (op1
) == NOP_EXPR
|| TREE_CODE (op1
) == INTEGER_CST
))
14136 tree inner0
= (TREE_CODE (op0
) == NOP_EXPR
)
14137 ? TREE_TYPE (TREE_OPERAND (op0
, 0))
14139 tree inner1
= (TREE_CODE (op1
) == NOP_EXPR
)
14140 ? TREE_TYPE (TREE_OPERAND (op1
, 0))
14143 bool unsigned0
= TYPE_UNSIGNED (inner0
);
14144 bool unsigned1
= TYPE_UNSIGNED (inner1
);
14146 if (TREE_CODE (op0
) == INTEGER_CST
)
14147 unsigned0
= unsigned0
|| tree_int_cst_sgn (op0
) >= 0;
14149 if (TREE_CODE (op1
) == INTEGER_CST
)
14150 unsigned1
= unsigned1
|| tree_int_cst_sgn (op1
) >= 0;
14152 if (TREE_CODE (inner0
) == INTEGER_TYPE
&& unsigned0
14153 && TREE_CODE (inner1
) == INTEGER_TYPE
&& unsigned1
)
14155 unsigned int precision0
= (TREE_CODE (op0
) == INTEGER_CST
)
14156 ? tree_int_cst_min_precision (op0
, UNSIGNED
)
14157 : TYPE_PRECISION (inner0
);
14159 unsigned int precision1
= (TREE_CODE (op1
) == INTEGER_CST
)
14160 ? tree_int_cst_min_precision (op1
, UNSIGNED
)
14161 : TYPE_PRECISION (inner1
);
14163 return precision0
+ precision1
< TYPE_PRECISION (type
);
14170 return (tree_expr_nonnegative_warnv_p (op0
,
14172 || tree_expr_nonnegative_warnv_p (op1
,
14173 strict_overflow_p
));
14179 case TRUNC_DIV_EXPR
:
14180 case CEIL_DIV_EXPR
:
14181 case FLOOR_DIV_EXPR
:
14182 case ROUND_DIV_EXPR
:
14183 return (tree_expr_nonnegative_warnv_p (op0
,
14185 && tree_expr_nonnegative_warnv_p (op1
,
14186 strict_overflow_p
));
14188 case TRUNC_MOD_EXPR
:
14189 case CEIL_MOD_EXPR
:
14190 case FLOOR_MOD_EXPR
:
14191 case ROUND_MOD_EXPR
:
14192 return tree_expr_nonnegative_warnv_p (op0
,
14193 strict_overflow_p
);
14195 return tree_simple_nonnegative_warnv_p (code
, type
);
14198 /* We don't know sign of `t', so be conservative and return false. */
14202 /* Return true if T is known to be non-negative. If the return
14203 value is based on the assumption that signed overflow is undefined,
14204 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14205 *STRICT_OVERFLOW_P. */
14208 tree_single_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
)
14210 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
14213 switch (TREE_CODE (t
))
14216 return tree_int_cst_sgn (t
) >= 0;
14219 return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
14222 return ! FIXED_VALUE_NEGATIVE (TREE_FIXED_CST (t
));
14225 return (tree_expr_nonnegative_warnv_p (TREE_OPERAND (t
, 1),
14227 && tree_expr_nonnegative_warnv_p (TREE_OPERAND (t
, 2),
14228 strict_overflow_p
));
14230 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
),
14233 /* We don't know sign of `t', so be conservative and return false. */
14237 /* Return true if T is known to be non-negative. If the return
14238 value is based on the assumption that signed overflow is undefined,
14239 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14240 *STRICT_OVERFLOW_P. */
14243 tree_call_nonnegative_warnv_p (tree type
, tree fndecl
,
14244 tree arg0
, tree arg1
, bool *strict_overflow_p
)
14246 if (fndecl
&& DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
)
14247 switch (DECL_FUNCTION_CODE (fndecl
))
14249 CASE_FLT_FN (BUILT_IN_ACOS
):
14250 CASE_FLT_FN (BUILT_IN_ACOSH
):
14251 CASE_FLT_FN (BUILT_IN_CABS
):
14252 CASE_FLT_FN (BUILT_IN_COSH
):
14253 CASE_FLT_FN (BUILT_IN_ERFC
):
14254 CASE_FLT_FN (BUILT_IN_EXP
):
14255 CASE_FLT_FN (BUILT_IN_EXP10
):
14256 CASE_FLT_FN (BUILT_IN_EXP2
):
14257 CASE_FLT_FN (BUILT_IN_FABS
):
14258 CASE_FLT_FN (BUILT_IN_FDIM
):
14259 CASE_FLT_FN (BUILT_IN_HYPOT
):
14260 CASE_FLT_FN (BUILT_IN_POW10
):
14261 CASE_INT_FN (BUILT_IN_FFS
):
14262 CASE_INT_FN (BUILT_IN_PARITY
):
14263 CASE_INT_FN (BUILT_IN_POPCOUNT
):
14264 CASE_INT_FN (BUILT_IN_CLZ
):
14265 CASE_INT_FN (BUILT_IN_CLRSB
):
14266 case BUILT_IN_BSWAP32
:
14267 case BUILT_IN_BSWAP64
:
14271 CASE_FLT_FN (BUILT_IN_SQRT
):
14272 /* sqrt(-0.0) is -0.0. */
14273 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
14275 return tree_expr_nonnegative_warnv_p (arg0
,
14276 strict_overflow_p
);
14278 CASE_FLT_FN (BUILT_IN_ASINH
):
14279 CASE_FLT_FN (BUILT_IN_ATAN
):
14280 CASE_FLT_FN (BUILT_IN_ATANH
):
14281 CASE_FLT_FN (BUILT_IN_CBRT
):
14282 CASE_FLT_FN (BUILT_IN_CEIL
):
14283 CASE_FLT_FN (BUILT_IN_ERF
):
14284 CASE_FLT_FN (BUILT_IN_EXPM1
):
14285 CASE_FLT_FN (BUILT_IN_FLOOR
):
14286 CASE_FLT_FN (BUILT_IN_FMOD
):
14287 CASE_FLT_FN (BUILT_IN_FREXP
):
14288 CASE_FLT_FN (BUILT_IN_ICEIL
):
14289 CASE_FLT_FN (BUILT_IN_IFLOOR
):
14290 CASE_FLT_FN (BUILT_IN_IRINT
):
14291 CASE_FLT_FN (BUILT_IN_IROUND
):
14292 CASE_FLT_FN (BUILT_IN_LCEIL
):
14293 CASE_FLT_FN (BUILT_IN_LDEXP
):
14294 CASE_FLT_FN (BUILT_IN_LFLOOR
):
14295 CASE_FLT_FN (BUILT_IN_LLCEIL
):
14296 CASE_FLT_FN (BUILT_IN_LLFLOOR
):
14297 CASE_FLT_FN (BUILT_IN_LLRINT
):
14298 CASE_FLT_FN (BUILT_IN_LLROUND
):
14299 CASE_FLT_FN (BUILT_IN_LRINT
):
14300 CASE_FLT_FN (BUILT_IN_LROUND
):
14301 CASE_FLT_FN (BUILT_IN_MODF
):
14302 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
14303 CASE_FLT_FN (BUILT_IN_RINT
):
14304 CASE_FLT_FN (BUILT_IN_ROUND
):
14305 CASE_FLT_FN (BUILT_IN_SCALB
):
14306 CASE_FLT_FN (BUILT_IN_SCALBLN
):
14307 CASE_FLT_FN (BUILT_IN_SCALBN
):
14308 CASE_FLT_FN (BUILT_IN_SIGNBIT
):
14309 CASE_FLT_FN (BUILT_IN_SIGNIFICAND
):
14310 CASE_FLT_FN (BUILT_IN_SINH
):
14311 CASE_FLT_FN (BUILT_IN_TANH
):
14312 CASE_FLT_FN (BUILT_IN_TRUNC
):
14313 /* True if the 1st argument is nonnegative. */
14314 return tree_expr_nonnegative_warnv_p (arg0
,
14315 strict_overflow_p
);
14317 CASE_FLT_FN (BUILT_IN_FMAX
):
14318 /* True if the 1st OR 2nd arguments are nonnegative. */
14319 return (tree_expr_nonnegative_warnv_p (arg0
,
14321 || (tree_expr_nonnegative_warnv_p (arg1
,
14322 strict_overflow_p
)));
14324 CASE_FLT_FN (BUILT_IN_FMIN
):
14325 /* True if the 1st AND 2nd arguments are nonnegative. */
14326 return (tree_expr_nonnegative_warnv_p (arg0
,
14328 && (tree_expr_nonnegative_warnv_p (arg1
,
14329 strict_overflow_p
)));
14331 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
14332 /* True if the 2nd argument is nonnegative. */
14333 return tree_expr_nonnegative_warnv_p (arg1
,
14334 strict_overflow_p
);
14336 CASE_FLT_FN (BUILT_IN_POWI
):
14337 /* True if the 1st argument is nonnegative or the second
14338 argument is an even integer. */
14339 if (TREE_CODE (arg1
) == INTEGER_CST
14340 && (TREE_INT_CST_LOW (arg1
) & 1) == 0)
14342 return tree_expr_nonnegative_warnv_p (arg0
,
14343 strict_overflow_p
);
14345 CASE_FLT_FN (BUILT_IN_POW
):
14346 /* True if the 1st argument is nonnegative or the second
14347 argument is an even integer valued real. */
14348 if (TREE_CODE (arg1
) == REAL_CST
)
14353 c
= TREE_REAL_CST (arg1
);
14354 n
= real_to_integer (&c
);
14357 REAL_VALUE_TYPE cint
;
14358 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
14359 if (real_identical (&c
, &cint
))
14363 return tree_expr_nonnegative_warnv_p (arg0
,
14364 strict_overflow_p
);
14369 return tree_simple_nonnegative_warnv_p (CALL_EXPR
,
14373 /* Return true if T is known to be non-negative. If the return
14374 value is based on the assumption that signed overflow is undefined,
14375 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14376 *STRICT_OVERFLOW_P. */
14379 tree_invalid_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
)
14381 enum tree_code code
= TREE_CODE (t
);
14382 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
14389 tree temp
= TARGET_EXPR_SLOT (t
);
14390 t
= TARGET_EXPR_INITIAL (t
);
14392 /* If the initializer is non-void, then it's a normal expression
14393 that will be assigned to the slot. */
14394 if (!VOID_TYPE_P (t
))
14395 return tree_expr_nonnegative_warnv_p (t
, strict_overflow_p
);
14397 /* Otherwise, the initializer sets the slot in some way. One common
14398 way is an assignment statement at the end of the initializer. */
14401 if (TREE_CODE (t
) == BIND_EXPR
)
14402 t
= expr_last (BIND_EXPR_BODY (t
));
14403 else if (TREE_CODE (t
) == TRY_FINALLY_EXPR
14404 || TREE_CODE (t
) == TRY_CATCH_EXPR
)
14405 t
= expr_last (TREE_OPERAND (t
, 0));
14406 else if (TREE_CODE (t
) == STATEMENT_LIST
)
14411 if (TREE_CODE (t
) == MODIFY_EXPR
14412 && TREE_OPERAND (t
, 0) == temp
)
14413 return tree_expr_nonnegative_warnv_p (TREE_OPERAND (t
, 1),
14414 strict_overflow_p
);
14421 tree arg0
= call_expr_nargs (t
) > 0 ? CALL_EXPR_ARG (t
, 0) : NULL_TREE
;
14422 tree arg1
= call_expr_nargs (t
) > 1 ? CALL_EXPR_ARG (t
, 1) : NULL_TREE
;
14424 return tree_call_nonnegative_warnv_p (TREE_TYPE (t
),
14425 get_callee_fndecl (t
),
14428 strict_overflow_p
);
14430 case COMPOUND_EXPR
:
14432 return tree_expr_nonnegative_warnv_p (TREE_OPERAND (t
, 1),
14433 strict_overflow_p
);
14435 return tree_expr_nonnegative_warnv_p (expr_last (TREE_OPERAND (t
, 1)),
14436 strict_overflow_p
);
14438 return tree_expr_nonnegative_warnv_p (TREE_OPERAND (t
, 0),
14439 strict_overflow_p
);
14442 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
),
14446 /* We don't know sign of `t', so be conservative and return false. */
14450 /* Return true if T is known to be non-negative. If the return
14451 value is based on the assumption that signed overflow is undefined,
14452 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14453 *STRICT_OVERFLOW_P. */
14456 tree_expr_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
)
14458 enum tree_code code
;
14459 if (t
== error_mark_node
)
14462 code
= TREE_CODE (t
);
14463 switch (TREE_CODE_CLASS (code
))
14466 case tcc_comparison
:
14467 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14469 TREE_OPERAND (t
, 0),
14470 TREE_OPERAND (t
, 1),
14471 strict_overflow_p
);
14474 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14476 TREE_OPERAND (t
, 0),
14477 strict_overflow_p
);
14480 case tcc_declaration
:
14481 case tcc_reference
:
14482 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
);
14490 case TRUTH_AND_EXPR
:
14491 case TRUTH_OR_EXPR
:
14492 case TRUTH_XOR_EXPR
:
14493 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14495 TREE_OPERAND (t
, 0),
14496 TREE_OPERAND (t
, 1),
14497 strict_overflow_p
);
14498 case TRUTH_NOT_EXPR
:
14499 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14501 TREE_OPERAND (t
, 0),
14502 strict_overflow_p
);
14509 case WITH_SIZE_EXPR
:
14511 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
);
14514 return tree_invalid_nonnegative_warnv_p (t
, strict_overflow_p
);
14518 /* Return true if `t' is known to be non-negative. Handle warnings
14519 about undefined signed overflow. */
14522 tree_expr_nonnegative_p (tree t
)
14524 bool ret
, strict_overflow_p
;
14526 strict_overflow_p
= false;
14527 ret
= tree_expr_nonnegative_warnv_p (t
, &strict_overflow_p
);
14528 if (strict_overflow_p
)
14529 fold_overflow_warning (("assuming signed overflow does not occur when "
14530 "determining that expression is always "
14532 WARN_STRICT_OVERFLOW_MISC
);
14537 /* Return true when (CODE OP0) is an address and is known to be nonzero.
14538 For floating point we further ensure that T is not denormal.
14539 Similar logic is present in nonzero_address in rtlanal.h.
14541 If the return value is based on the assumption that signed overflow
14542 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14543 change *STRICT_OVERFLOW_P. */
14546 tree_unary_nonzero_warnv_p (enum tree_code code
, tree type
, tree op0
,
14547 bool *strict_overflow_p
)
14552 return tree_expr_nonzero_warnv_p (op0
,
14553 strict_overflow_p
);
14557 tree inner_type
= TREE_TYPE (op0
);
14558 tree outer_type
= type
;
14560 return (TYPE_PRECISION (outer_type
) >= TYPE_PRECISION (inner_type
)
14561 && tree_expr_nonzero_warnv_p (op0
,
14562 strict_overflow_p
));
14566 case NON_LVALUE_EXPR
:
14567 return tree_expr_nonzero_warnv_p (op0
,
14568 strict_overflow_p
);
14577 /* Return true when (CODE OP0 OP1) is an address and is known to be nonzero.
14578 For floating point we further ensure that T is not denormal.
14579 Similar logic is present in nonzero_address in rtlanal.h.
14581 If the return value is based on the assumption that signed overflow
14582 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14583 change *STRICT_OVERFLOW_P. */
14586 tree_binary_nonzero_warnv_p (enum tree_code code
,
14589 tree op1
, bool *strict_overflow_p
)
14591 bool sub_strict_overflow_p
;
14594 case POINTER_PLUS_EXPR
:
14596 if (ANY_INTEGRAL_TYPE_P (type
) && TYPE_OVERFLOW_UNDEFINED (type
))
14598 /* With the presence of negative values it is hard
14599 to say something. */
14600 sub_strict_overflow_p
= false;
14601 if (!tree_expr_nonnegative_warnv_p (op0
,
14602 &sub_strict_overflow_p
)
14603 || !tree_expr_nonnegative_warnv_p (op1
,
14604 &sub_strict_overflow_p
))
14606 /* One of operands must be positive and the other non-negative. */
14607 /* We don't set *STRICT_OVERFLOW_P here: even if this value
14608 overflows, on a twos-complement machine the sum of two
14609 nonnegative numbers can never be zero. */
14610 return (tree_expr_nonzero_warnv_p (op0
,
14612 || tree_expr_nonzero_warnv_p (op1
,
14613 strict_overflow_p
));
14618 if (TYPE_OVERFLOW_UNDEFINED (type
))
14620 if (tree_expr_nonzero_warnv_p (op0
,
14622 && tree_expr_nonzero_warnv_p (op1
,
14623 strict_overflow_p
))
14625 *strict_overflow_p
= true;
14632 sub_strict_overflow_p
= false;
14633 if (tree_expr_nonzero_warnv_p (op0
,
14634 &sub_strict_overflow_p
)
14635 && tree_expr_nonzero_warnv_p (op1
,
14636 &sub_strict_overflow_p
))
14638 if (sub_strict_overflow_p
)
14639 *strict_overflow_p
= true;
14644 sub_strict_overflow_p
= false;
14645 if (tree_expr_nonzero_warnv_p (op0
,
14646 &sub_strict_overflow_p
))
14648 if (sub_strict_overflow_p
)
14649 *strict_overflow_p
= true;
14651 /* When both operands are nonzero, then MAX must be too. */
14652 if (tree_expr_nonzero_warnv_p (op1
,
14653 strict_overflow_p
))
14656 /* MAX where operand 0 is positive is positive. */
14657 return tree_expr_nonnegative_warnv_p (op0
,
14658 strict_overflow_p
);
14660 /* MAX where operand 1 is positive is positive. */
14661 else if (tree_expr_nonzero_warnv_p (op1
,
14662 &sub_strict_overflow_p
)
14663 && tree_expr_nonnegative_warnv_p (op1
,
14664 &sub_strict_overflow_p
))
14666 if (sub_strict_overflow_p
)
14667 *strict_overflow_p
= true;
14673 return (tree_expr_nonzero_warnv_p (op1
,
14675 || tree_expr_nonzero_warnv_p (op0
,
14676 strict_overflow_p
));
14685 /* Return true when T is an address and is known to be nonzero.
14686 For floating point we further ensure that T is not denormal.
14687 Similar logic is present in nonzero_address in rtlanal.h.
14689 If the return value is based on the assumption that signed overflow
14690 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14691 change *STRICT_OVERFLOW_P. */
14694 tree_single_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
14696 bool sub_strict_overflow_p
;
14697 switch (TREE_CODE (t
))
14700 return !integer_zerop (t
);
14704 tree base
= TREE_OPERAND (t
, 0);
14706 if (!DECL_P (base
))
14707 base
= get_base_address (base
);
14712 /* For objects in symbol table check if we know they are non-zero.
14713 Don't do anything for variables and functions before symtab is built;
14714 it is quite possible that they will be declared weak later. */
14715 if (DECL_P (base
) && decl_in_symtab_p (base
))
14717 struct symtab_node
*symbol
;
14719 symbol
= symtab_node::get_create (base
);
14721 return symbol
->nonzero_address ();
14726 /* Function local objects are never NULL. */
14728 && (DECL_CONTEXT (base
)
14729 && TREE_CODE (DECL_CONTEXT (base
)) == FUNCTION_DECL
14730 && auto_var_in_fn_p (base
, DECL_CONTEXT (base
))))
14733 /* Constants are never weak. */
14734 if (CONSTANT_CLASS_P (base
))
14741 sub_strict_overflow_p
= false;
14742 if (tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
14743 &sub_strict_overflow_p
)
14744 && tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 2),
14745 &sub_strict_overflow_p
))
14747 if (sub_strict_overflow_p
)
14748 *strict_overflow_p
= true;
14759 /* Given the components of a binary expression CODE, TYPE, OP0 and OP1,
14760 attempt to fold the expression to a constant without modifying TYPE,
14763 If the expression could be simplified to a constant, then return
14764 the constant. If the expression would not be simplified to a
14765 constant, then return NULL_TREE. */
14768 fold_binary_to_constant (enum tree_code code
, tree type
, tree op0
, tree op1
)
14770 tree tem
= fold_binary (code
, type
, op0
, op1
);
14771 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14774 /* Given the components of a unary expression CODE, TYPE and OP0,
14775 attempt to fold the expression to a constant without modifying
14778 If the expression could be simplified to a constant, then return
14779 the constant. If the expression would not be simplified to a
14780 constant, then return NULL_TREE. */
14783 fold_unary_to_constant (enum tree_code code
, tree type
, tree op0
)
14785 tree tem
= fold_unary (code
, type
, op0
);
14786 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14789 /* If EXP represents referencing an element in a constant string
14790 (either via pointer arithmetic or array indexing), return the
14791 tree representing the value accessed, otherwise return NULL. */
14794 fold_read_from_constant_string (tree exp
)
14796 if ((TREE_CODE (exp
) == INDIRECT_REF
14797 || TREE_CODE (exp
) == ARRAY_REF
)
14798 && TREE_CODE (TREE_TYPE (exp
)) == INTEGER_TYPE
)
14800 tree exp1
= TREE_OPERAND (exp
, 0);
14803 location_t loc
= EXPR_LOCATION (exp
);
14805 if (TREE_CODE (exp
) == INDIRECT_REF
)
14806 string
= string_constant (exp1
, &index
);
14809 tree low_bound
= array_ref_low_bound (exp
);
14810 index
= fold_convert_loc (loc
, sizetype
, TREE_OPERAND (exp
, 1));
14812 /* Optimize the special-case of a zero lower bound.
14814 We convert the low_bound to sizetype to avoid some problems
14815 with constant folding. (E.g. suppose the lower bound is 1,
14816 and its mode is QI. Without the conversion,l (ARRAY
14817 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
14818 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
14819 if (! integer_zerop (low_bound
))
14820 index
= size_diffop_loc (loc
, index
,
14821 fold_convert_loc (loc
, sizetype
, low_bound
));
14827 && TYPE_MODE (TREE_TYPE (exp
)) == TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))
14828 && TREE_CODE (string
) == STRING_CST
14829 && TREE_CODE (index
) == INTEGER_CST
14830 && compare_tree_int (index
, TREE_STRING_LENGTH (string
)) < 0
14831 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
))))
14833 && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))) == 1))
14834 return build_int_cst_type (TREE_TYPE (exp
),
14835 (TREE_STRING_POINTER (string
)
14836 [TREE_INT_CST_LOW (index
)]));
14841 /* Return the tree for neg (ARG0) when ARG0 is known to be either
14842 an integer constant, real, or fixed-point constant.
14844 TYPE is the type of the result. */
14847 fold_negate_const (tree arg0
, tree type
)
14849 tree t
= NULL_TREE
;
14851 switch (TREE_CODE (arg0
))
14856 wide_int val
= wi::neg (arg0
, &overflow
);
14857 t
= force_fit_type (type
, val
, 1,
14858 (overflow
| TREE_OVERFLOW (arg0
))
14859 && !TYPE_UNSIGNED (type
));
14864 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14869 FIXED_VALUE_TYPE f
;
14870 bool overflow_p
= fixed_arithmetic (&f
, NEGATE_EXPR
,
14871 &(TREE_FIXED_CST (arg0
)), NULL
,
14872 TYPE_SATURATING (type
));
14873 t
= build_fixed (type
, f
);
14874 /* Propagate overflow flags. */
14875 if (overflow_p
| TREE_OVERFLOW (arg0
))
14876 TREE_OVERFLOW (t
) = 1;
14881 gcc_unreachable ();
14887 /* Return the tree for abs (ARG0) when ARG0 is known to be either
14888 an integer constant or real constant.
14890 TYPE is the type of the result. */
14893 fold_abs_const (tree arg0
, tree type
)
14895 tree t
= NULL_TREE
;
14897 switch (TREE_CODE (arg0
))
14901 /* If the value is unsigned or non-negative, then the absolute value
14902 is the same as the ordinary value. */
14903 if (!wi::neg_p (arg0
, TYPE_SIGN (type
)))
14906 /* If the value is negative, then the absolute value is
14911 wide_int val
= wi::neg (arg0
, &overflow
);
14912 t
= force_fit_type (type
, val
, -1,
14913 overflow
| TREE_OVERFLOW (arg0
));
14919 if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg0
)))
14920 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14926 gcc_unreachable ();
14932 /* Return the tree for not (ARG0) when ARG0 is known to be an integer
14933 constant. TYPE is the type of the result. */
14936 fold_not_const (const_tree arg0
, tree type
)
14938 gcc_assert (TREE_CODE (arg0
) == INTEGER_CST
);
14940 return force_fit_type (type
, wi::bit_not (arg0
), 0, TREE_OVERFLOW (arg0
));
14943 /* Given CODE, a relational operator, the target type, TYPE and two
14944 constant operands OP0 and OP1, return the result of the
14945 relational operation. If the result is not a compile time
14946 constant, then return NULL_TREE. */
14949 fold_relational_const (enum tree_code code
, tree type
, tree op0
, tree op1
)
14951 int result
, invert
;
14953 /* From here on, the only cases we handle are when the result is
14954 known to be a constant. */
14956 if (TREE_CODE (op0
) == REAL_CST
&& TREE_CODE (op1
) == REAL_CST
)
14958 const REAL_VALUE_TYPE
*c0
= TREE_REAL_CST_PTR (op0
);
14959 const REAL_VALUE_TYPE
*c1
= TREE_REAL_CST_PTR (op1
);
14961 /* Handle the cases where either operand is a NaN. */
14962 if (real_isnan (c0
) || real_isnan (c1
))
14972 case UNORDERED_EXPR
:
14986 if (flag_trapping_math
)
14992 gcc_unreachable ();
14995 return constant_boolean_node (result
, type
);
14998 return constant_boolean_node (real_compare (code
, c0
, c1
), type
);
15001 if (TREE_CODE (op0
) == FIXED_CST
&& TREE_CODE (op1
) == FIXED_CST
)
15003 const FIXED_VALUE_TYPE
*c0
= TREE_FIXED_CST_PTR (op0
);
15004 const FIXED_VALUE_TYPE
*c1
= TREE_FIXED_CST_PTR (op1
);
15005 return constant_boolean_node (fixed_compare (code
, c0
, c1
), type
);
15008 /* Handle equality/inequality of complex constants. */
15009 if (TREE_CODE (op0
) == COMPLEX_CST
&& TREE_CODE (op1
) == COMPLEX_CST
)
15011 tree rcond
= fold_relational_const (code
, type
,
15012 TREE_REALPART (op0
),
15013 TREE_REALPART (op1
));
15014 tree icond
= fold_relational_const (code
, type
,
15015 TREE_IMAGPART (op0
),
15016 TREE_IMAGPART (op1
));
15017 if (code
== EQ_EXPR
)
15018 return fold_build2 (TRUTH_ANDIF_EXPR
, type
, rcond
, icond
);
15019 else if (code
== NE_EXPR
)
15020 return fold_build2 (TRUTH_ORIF_EXPR
, type
, rcond
, icond
);
15025 if (TREE_CODE (op0
) == VECTOR_CST
&& TREE_CODE (op1
) == VECTOR_CST
)
15027 unsigned count
= VECTOR_CST_NELTS (op0
);
15028 tree
*elts
= XALLOCAVEC (tree
, count
);
15029 gcc_assert (VECTOR_CST_NELTS (op1
) == count
15030 && TYPE_VECTOR_SUBPARTS (type
) == count
);
15032 for (unsigned i
= 0; i
< count
; i
++)
15034 tree elem_type
= TREE_TYPE (type
);
15035 tree elem0
= VECTOR_CST_ELT (op0
, i
);
15036 tree elem1
= VECTOR_CST_ELT (op1
, i
);
15038 tree tem
= fold_relational_const (code
, elem_type
,
15041 if (tem
== NULL_TREE
)
15044 elts
[i
] = build_int_cst (elem_type
, integer_zerop (tem
) ? 0 : -1);
15047 return build_vector (type
, elts
);
15050 /* From here on we only handle LT, LE, GT, GE, EQ and NE.
15052 To compute GT, swap the arguments and do LT.
15053 To compute GE, do LT and invert the result.
15054 To compute LE, swap the arguments, do LT and invert the result.
15055 To compute NE, do EQ and invert the result.
15057 Therefore, the code below must handle only EQ and LT. */
15059 if (code
== LE_EXPR
|| code
== GT_EXPR
)
15061 std::swap (op0
, op1
);
15062 code
= swap_tree_comparison (code
);
15065 /* Note that it is safe to invert for real values here because we
15066 have already handled the one case that it matters. */
15069 if (code
== NE_EXPR
|| code
== GE_EXPR
)
15072 code
= invert_tree_comparison (code
, false);
15075 /* Compute a result for LT or EQ if args permit;
15076 Otherwise return T. */
15077 if (TREE_CODE (op0
) == INTEGER_CST
&& TREE_CODE (op1
) == INTEGER_CST
)
15079 if (code
== EQ_EXPR
)
15080 result
= tree_int_cst_equal (op0
, op1
);
15082 result
= tree_int_cst_lt (op0
, op1
);
15089 return constant_boolean_node (result
, type
);
15092 /* If necessary, return a CLEANUP_POINT_EXPR for EXPR with the
15093 indicated TYPE. If no CLEANUP_POINT_EXPR is necessary, return EXPR
15097 fold_build_cleanup_point_expr (tree type
, tree expr
)
15099 /* If the expression does not have side effects then we don't have to wrap
15100 it with a cleanup point expression. */
15101 if (!TREE_SIDE_EFFECTS (expr
))
15104 /* If the expression is a return, check to see if the expression inside the
15105 return has no side effects or the right hand side of the modify expression
15106 inside the return. If either don't have side effects set we don't need to
15107 wrap the expression in a cleanup point expression. Note we don't check the
15108 left hand side of the modify because it should always be a return decl. */
15109 if (TREE_CODE (expr
) == RETURN_EXPR
)
15111 tree op
= TREE_OPERAND (expr
, 0);
15112 if (!op
|| !TREE_SIDE_EFFECTS (op
))
15114 op
= TREE_OPERAND (op
, 1);
15115 if (!TREE_SIDE_EFFECTS (op
))
15119 return build1 (CLEANUP_POINT_EXPR
, type
, expr
);
15122 /* Given a pointer value OP0 and a type TYPE, return a simplified version
15123 of an indirection through OP0, or NULL_TREE if no simplification is
15127 fold_indirect_ref_1 (location_t loc
, tree type
, tree op0
)
15133 subtype
= TREE_TYPE (sub
);
15134 if (!POINTER_TYPE_P (subtype
))
15137 if (TREE_CODE (sub
) == ADDR_EXPR
)
15139 tree op
= TREE_OPERAND (sub
, 0);
15140 tree optype
= TREE_TYPE (op
);
15141 /* *&CONST_DECL -> to the value of the const decl. */
15142 if (TREE_CODE (op
) == CONST_DECL
)
15143 return DECL_INITIAL (op
);
15144 /* *&p => p; make sure to handle *&"str"[cst] here. */
15145 if (type
== optype
)
15147 tree fop
= fold_read_from_constant_string (op
);
15153 /* *(foo *)&fooarray => fooarray[0] */
15154 else if (TREE_CODE (optype
) == ARRAY_TYPE
15155 && type
== TREE_TYPE (optype
)
15156 && (!in_gimple_form
15157 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
15159 tree type_domain
= TYPE_DOMAIN (optype
);
15160 tree min_val
= size_zero_node
;
15161 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15162 min_val
= TYPE_MIN_VALUE (type_domain
);
15164 && TREE_CODE (min_val
) != INTEGER_CST
)
15166 return build4_loc (loc
, ARRAY_REF
, type
, op
, min_val
,
15167 NULL_TREE
, NULL_TREE
);
15169 /* *(foo *)&complexfoo => __real__ complexfoo */
15170 else if (TREE_CODE (optype
) == COMPLEX_TYPE
15171 && type
== TREE_TYPE (optype
))
15172 return fold_build1_loc (loc
, REALPART_EXPR
, type
, op
);
15173 /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
15174 else if (TREE_CODE (optype
) == VECTOR_TYPE
15175 && type
== TREE_TYPE (optype
))
15177 tree part_width
= TYPE_SIZE (type
);
15178 tree index
= bitsize_int (0);
15179 return fold_build3_loc (loc
, BIT_FIELD_REF
, type
, op
, part_width
, index
);
15183 if (TREE_CODE (sub
) == POINTER_PLUS_EXPR
15184 && TREE_CODE (TREE_OPERAND (sub
, 1)) == INTEGER_CST
)
15186 tree op00
= TREE_OPERAND (sub
, 0);
15187 tree op01
= TREE_OPERAND (sub
, 1);
15190 if (TREE_CODE (op00
) == ADDR_EXPR
)
15193 op00
= TREE_OPERAND (op00
, 0);
15194 op00type
= TREE_TYPE (op00
);
15196 /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */
15197 if (TREE_CODE (op00type
) == VECTOR_TYPE
15198 && type
== TREE_TYPE (op00type
))
15200 HOST_WIDE_INT offset
= tree_to_shwi (op01
);
15201 tree part_width
= TYPE_SIZE (type
);
15202 unsigned HOST_WIDE_INT part_widthi
= tree_to_shwi (part_width
)/BITS_PER_UNIT
;
15203 unsigned HOST_WIDE_INT indexi
= offset
* BITS_PER_UNIT
;
15204 tree index
= bitsize_int (indexi
);
15206 if (offset
/ part_widthi
< TYPE_VECTOR_SUBPARTS (op00type
))
15207 return fold_build3_loc (loc
,
15208 BIT_FIELD_REF
, type
, op00
,
15209 part_width
, index
);
15212 /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */
15213 else if (TREE_CODE (op00type
) == COMPLEX_TYPE
15214 && type
== TREE_TYPE (op00type
))
15216 tree size
= TYPE_SIZE_UNIT (type
);
15217 if (tree_int_cst_equal (size
, op01
))
15218 return fold_build1_loc (loc
, IMAGPART_EXPR
, type
, op00
);
15220 /* ((foo *)&fooarray)[1] => fooarray[1] */
15221 else if (TREE_CODE (op00type
) == ARRAY_TYPE
15222 && type
== TREE_TYPE (op00type
))
15224 tree type_domain
= TYPE_DOMAIN (op00type
);
15225 tree min_val
= size_zero_node
;
15226 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15227 min_val
= TYPE_MIN_VALUE (type_domain
);
15228 op01
= size_binop_loc (loc
, EXACT_DIV_EXPR
, op01
,
15229 TYPE_SIZE_UNIT (type
));
15230 op01
= size_binop_loc (loc
, PLUS_EXPR
, op01
, min_val
);
15231 return build4_loc (loc
, ARRAY_REF
, type
, op00
, op01
,
15232 NULL_TREE
, NULL_TREE
);
15237 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
15238 if (TREE_CODE (TREE_TYPE (subtype
)) == ARRAY_TYPE
15239 && type
== TREE_TYPE (TREE_TYPE (subtype
))
15240 && (!in_gimple_form
15241 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
15244 tree min_val
= size_zero_node
;
15245 sub
= build_fold_indirect_ref_loc (loc
, sub
);
15246 type_domain
= TYPE_DOMAIN (TREE_TYPE (sub
));
15247 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15248 min_val
= TYPE_MIN_VALUE (type_domain
);
15250 && TREE_CODE (min_val
) != INTEGER_CST
)
15252 return build4_loc (loc
, ARRAY_REF
, type
, sub
, min_val
, NULL_TREE
,
15259 /* Builds an expression for an indirection through T, simplifying some
15263 build_fold_indirect_ref_loc (location_t loc
, tree t
)
15265 tree type
= TREE_TYPE (TREE_TYPE (t
));
15266 tree sub
= fold_indirect_ref_1 (loc
, type
, t
);
15271 return build1_loc (loc
, INDIRECT_REF
, type
, t
);
15274 /* Given an INDIRECT_REF T, return either T or a simplified version. */
15277 fold_indirect_ref_loc (location_t loc
, tree t
)
15279 tree sub
= fold_indirect_ref_1 (loc
, TREE_TYPE (t
), TREE_OPERAND (t
, 0));
15287 /* Strip non-trapping, non-side-effecting tree nodes from an expression
15288 whose result is ignored. The type of the returned tree need not be
15289 the same as the original expression. */
15292 fold_ignored_result (tree t
)
15294 if (!TREE_SIDE_EFFECTS (t
))
15295 return integer_zero_node
;
15298 switch (TREE_CODE_CLASS (TREE_CODE (t
)))
15301 t
= TREE_OPERAND (t
, 0);
15305 case tcc_comparison
:
15306 if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15307 t
= TREE_OPERAND (t
, 0);
15308 else if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 0)))
15309 t
= TREE_OPERAND (t
, 1);
15314 case tcc_expression
:
15315 switch (TREE_CODE (t
))
15317 case COMPOUND_EXPR
:
15318 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15320 t
= TREE_OPERAND (t
, 0);
15324 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1))
15325 || TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 2)))
15327 t
= TREE_OPERAND (t
, 0);
15340 /* Return the value of VALUE, rounded up to a multiple of DIVISOR. */
15343 round_up_loc (location_t loc
, tree value
, unsigned int divisor
)
15345 tree div
= NULL_TREE
;
15350 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15351 have to do anything. Only do this when we are not given a const,
15352 because in that case, this check is more expensive than just
15354 if (TREE_CODE (value
) != INTEGER_CST
)
15356 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15358 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15362 /* If divisor is a power of two, simplify this to bit manipulation. */
15363 if (divisor
== (divisor
& -divisor
))
15365 if (TREE_CODE (value
) == INTEGER_CST
)
15367 wide_int val
= value
;
15370 if ((val
& (divisor
- 1)) == 0)
15373 overflow_p
= TREE_OVERFLOW (value
);
15374 val
+= divisor
- 1;
15375 val
&= - (int) divisor
;
15379 return force_fit_type (TREE_TYPE (value
), val
, -1, overflow_p
);
15385 t
= build_int_cst (TREE_TYPE (value
), divisor
- 1);
15386 value
= size_binop_loc (loc
, PLUS_EXPR
, value
, t
);
15387 t
= build_int_cst (TREE_TYPE (value
), - (int) divisor
);
15388 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15394 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15395 value
= size_binop_loc (loc
, CEIL_DIV_EXPR
, value
, div
);
15396 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15402 /* Likewise, but round down. */
15405 round_down_loc (location_t loc
, tree value
, int divisor
)
15407 tree div
= NULL_TREE
;
15409 gcc_assert (divisor
> 0);
15413 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15414 have to do anything. Only do this when we are not given a const,
15415 because in that case, this check is more expensive than just
15417 if (TREE_CODE (value
) != INTEGER_CST
)
15419 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15421 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15425 /* If divisor is a power of two, simplify this to bit manipulation. */
15426 if (divisor
== (divisor
& -divisor
))
15430 t
= build_int_cst (TREE_TYPE (value
), -divisor
);
15431 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15436 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15437 value
= size_binop_loc (loc
, FLOOR_DIV_EXPR
, value
, div
);
15438 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15444 /* Returns the pointer to the base of the object addressed by EXP and
15445 extracts the information about the offset of the access, storing it
15446 to PBITPOS and POFFSET. */
15449 split_address_to_core_and_offset (tree exp
,
15450 HOST_WIDE_INT
*pbitpos
, tree
*poffset
)
15454 int unsignedp
, volatilep
;
15455 HOST_WIDE_INT bitsize
;
15456 location_t loc
= EXPR_LOCATION (exp
);
15458 if (TREE_CODE (exp
) == ADDR_EXPR
)
15460 core
= get_inner_reference (TREE_OPERAND (exp
, 0), &bitsize
, pbitpos
,
15461 poffset
, &mode
, &unsignedp
, &volatilep
,
15463 core
= build_fold_addr_expr_loc (loc
, core
);
15469 *poffset
= NULL_TREE
;
15475 /* Returns true if addresses of E1 and E2 differ by a constant, false
15476 otherwise. If they do, E1 - E2 is stored in *DIFF. */
15479 ptr_difference_const (tree e1
, tree e2
, HOST_WIDE_INT
*diff
)
15482 HOST_WIDE_INT bitpos1
, bitpos2
;
15483 tree toffset1
, toffset2
, tdiff
, type
;
15485 core1
= split_address_to_core_and_offset (e1
, &bitpos1
, &toffset1
);
15486 core2
= split_address_to_core_and_offset (e2
, &bitpos2
, &toffset2
);
15488 if (bitpos1
% BITS_PER_UNIT
!= 0
15489 || bitpos2
% BITS_PER_UNIT
!= 0
15490 || !operand_equal_p (core1
, core2
, 0))
15493 if (toffset1
&& toffset2
)
15495 type
= TREE_TYPE (toffset1
);
15496 if (type
!= TREE_TYPE (toffset2
))
15497 toffset2
= fold_convert (type
, toffset2
);
15499 tdiff
= fold_build2 (MINUS_EXPR
, type
, toffset1
, toffset2
);
15500 if (!cst_and_fits_in_hwi (tdiff
))
15503 *diff
= int_cst_value (tdiff
);
15505 else if (toffset1
|| toffset2
)
15507 /* If only one of the offsets is non-constant, the difference cannot
15514 *diff
+= (bitpos1
- bitpos2
) / BITS_PER_UNIT
;
15518 /* Simplify the floating point expression EXP when the sign of the
15519 result is not significant. Return NULL_TREE if no simplification
15523 fold_strip_sign_ops (tree exp
)
15526 location_t loc
= EXPR_LOCATION (exp
);
15528 switch (TREE_CODE (exp
))
15532 arg0
= fold_strip_sign_ops (TREE_OPERAND (exp
, 0));
15533 return arg0
? arg0
: TREE_OPERAND (exp
, 0);
15537 if (HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (exp
)))
15539 arg0
= fold_strip_sign_ops (TREE_OPERAND (exp
, 0));
15540 arg1
= fold_strip_sign_ops (TREE_OPERAND (exp
, 1));
15541 if (arg0
!= NULL_TREE
|| arg1
!= NULL_TREE
)
15542 return fold_build2_loc (loc
, TREE_CODE (exp
), TREE_TYPE (exp
),
15543 arg0
? arg0
: TREE_OPERAND (exp
, 0),
15544 arg1
? arg1
: TREE_OPERAND (exp
, 1));
15547 case COMPOUND_EXPR
:
15548 arg0
= TREE_OPERAND (exp
, 0);
15549 arg1
= fold_strip_sign_ops (TREE_OPERAND (exp
, 1));
15551 return fold_build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (exp
), arg0
, arg1
);
15555 arg0
= fold_strip_sign_ops (TREE_OPERAND (exp
, 1));
15556 arg1
= fold_strip_sign_ops (TREE_OPERAND (exp
, 2));
15558 return fold_build3_loc (loc
,
15559 COND_EXPR
, TREE_TYPE (exp
), TREE_OPERAND (exp
, 0),
15560 arg0
? arg0
: TREE_OPERAND (exp
, 1),
15561 arg1
? arg1
: TREE_OPERAND (exp
, 2));
15566 const enum built_in_function fcode
= builtin_mathfn_code (exp
);
15569 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
15570 /* Strip copysign function call, return the 1st argument. */
15571 arg0
= CALL_EXPR_ARG (exp
, 0);
15572 arg1
= CALL_EXPR_ARG (exp
, 1);
15573 return omit_one_operand_loc (loc
, TREE_TYPE (exp
), arg0
, arg1
);
15576 /* Strip sign ops from the argument of "odd" math functions. */
15577 if (negate_mathfn_p (fcode
))
15579 arg0
= fold_strip_sign_ops (CALL_EXPR_ARG (exp
, 0));
15581 return build_call_expr_loc (loc
, get_callee_fndecl (exp
), 1, arg0
);
15594 /* Return OFF converted to a pointer offset type suitable as offset for
15595 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
15597 convert_to_ptrofftype_loc (location_t loc
, tree off
)
15599 return fold_convert_loc (loc
, sizetype
, off
);
15602 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15604 fold_build_pointer_plus_loc (location_t loc
, tree ptr
, tree off
)
15606 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15607 ptr
, convert_to_ptrofftype_loc (loc
, off
));
15610 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15612 fold_build_pointer_plus_hwi_loc (location_t loc
, tree ptr
, HOST_WIDE_INT off
)
15614 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15615 ptr
, size_int (off
));