1 /* Match-and-simplify patterns for shared GENERIC and GIMPLE folding.
2 This file is consumed by genmatch which produces gimple-match.c
3 and generic-match.c from it.
5 Copyright (C) 2014-2015 Free Software Foundation, Inc.
6 Contributed by Richard Biener <rguenther@suse.de>
7 and Prathamesh Kulkarni <bilbotheelffriend@gmail.com>
9 This file is part of GCC.
11 GCC is free software; you can redistribute it and/or modify it under
12 the terms of the GNU General Public License as published by the Free
13 Software Foundation; either version 3, or (at your option) any later
16 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
17 WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with GCC; see the file COPYING3. If not see
23 <http://www.gnu.org/licenses/>. */
26 /* Generic tree predicates we inherit. */
28 integer_onep integer_zerop integer_all_onesp integer_minus_onep
29 integer_each_onep integer_truep
30 real_zerop real_onep real_minus_onep
32 tree_expr_nonnegative_p)
35 (define_operator_list tcc_comparison
36 lt le eq ne ge gt unordered ordered unlt unle ungt unge uneq ltgt)
37 (define_operator_list inverted_tcc_comparison
38 ge gt ne eq lt le ordered unordered ge gt le lt ltgt uneq)
39 (define_operator_list inverted_tcc_comparison_with_nans
40 unge ungt ne eq unlt unle ordered unordered ge gt le lt ltgt uneq)
41 (define_operator_list swapped_tcc_comparison
42 gt ge eq ne le lt unordered ordered ungt unge unlt unle uneq ltgt)
43 (define_operator_list simple_comparison lt le eq ne ge gt)
44 (define_operator_list swapped_simple_comparison gt ge eq ne le lt)
46 (define_operator_list LOG BUILT_IN_LOGF BUILT_IN_LOG BUILT_IN_LOGL)
47 (define_operator_list EXP BUILT_IN_EXPF BUILT_IN_EXP BUILT_IN_EXPL)
48 (define_operator_list LOG2 BUILT_IN_LOG2F BUILT_IN_LOG2 BUILT_IN_LOG2L)
49 (define_operator_list EXP2 BUILT_IN_EXP2F BUILT_IN_EXP2 BUILT_IN_EXP2L)
50 (define_operator_list LOG10 BUILT_IN_LOG10F BUILT_IN_LOG10 BUILT_IN_LOG10L)
51 (define_operator_list EXP10 BUILT_IN_EXP10F BUILT_IN_EXP10 BUILT_IN_EXP10L)
52 (define_operator_list POW BUILT_IN_POWF BUILT_IN_POW BUILT_IN_POWL)
53 (define_operator_list POW10 BUILT_IN_POW10F BUILT_IN_POW10 BUILT_IN_POW10L)
54 (define_operator_list SQRT BUILT_IN_SQRTF BUILT_IN_SQRT BUILT_IN_SQRTL)
55 (define_operator_list CBRT BUILT_IN_CBRTF BUILT_IN_CBRT BUILT_IN_CBRTL)
58 /* Simplifications of operations with one constant operand and
59 simplifications to constants or single values. */
61 (for op (plus pointer_plus minus bit_ior bit_xor)
66 /* 0 +p index -> (type)index */
68 (pointer_plus integer_zerop @1)
69 (non_lvalue (convert @1)))
71 /* See if ARG1 is zero and X + ARG1 reduces to X.
72 Likewise if the operands are reversed. */
74 (plus:c @0 real_zerop@1)
75 (if (fold_real_zero_addition_p (type, @1, 0))
78 /* See if ARG1 is zero and X - ARG1 reduces to X. */
80 (minus @0 real_zerop@1)
81 (if (fold_real_zero_addition_p (type, @1, 1))
85 This is unsafe for certain floats even in non-IEEE formats.
86 In IEEE, it is unsafe because it does wrong for NaNs.
87 Also note that operand_equal_p is always false if an operand
91 (if (!FLOAT_TYPE_P (type) || !HONOR_NANS (type))
92 { build_zero_cst (type); }))
95 (mult @0 integer_zerop@1)
98 /* Maybe fold x * 0 to 0. The expressions aren't the same
99 when x is NaN, since x * 0 is also NaN. Nor are they the
100 same in modes with signed zeros, since multiplying a
101 negative value by 0 gives -0, not +0. */
103 (mult @0 real_zerop@1)
104 (if (!HONOR_NANS (type) && !HONOR_SIGNED_ZEROS (type))
107 /* In IEEE floating point, x*1 is not equivalent to x for snans.
108 Likewise for complex arithmetic with signed zeros. */
111 (if (!HONOR_SNANS (type)
112 && (!HONOR_SIGNED_ZEROS (type)
113 || !COMPLEX_FLOAT_TYPE_P (type)))
116 /* Transform x * -1.0 into -x. */
118 (mult @0 real_minus_onep)
119 (if (!HONOR_SNANS (type)
120 && (!HONOR_SIGNED_ZEROS (type)
121 || !COMPLEX_FLOAT_TYPE_P (type)))
124 /* Make sure to preserve divisions by zero. This is the reason why
125 we don't simplify x / x to 1 or 0 / x to 0. */
126 (for op (mult trunc_div ceil_div floor_div round_div exact_div)
132 (for div (trunc_div ceil_div floor_div round_div exact_div)
134 (div @0 integer_minus_onep@1)
135 (if (!TYPE_UNSIGNED (type))
138 /* For unsigned integral types, FLOOR_DIV_EXPR is the same as
139 TRUNC_DIV_EXPR. Rewrite into the latter in this case. */
142 (if ((INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
143 && TYPE_UNSIGNED (type))
146 /* Combine two successive divisions. Note that combining ceil_div
147 and floor_div is trickier and combining round_div even more so. */
148 (for div (trunc_div exact_div)
150 (div (div @0 INTEGER_CST@1) INTEGER_CST@2)
153 wide_int mul = wi::mul (@1, @2, TYPE_SIGN (type), &overflow_p);
156 (div @0 { wide_int_to_tree (type, mul); })
157 (if (TYPE_UNSIGNED (type)
158 || mul != wi::min_value (TYPE_PRECISION (type), SIGNED))
159 { build_zero_cst (type); })))))
161 /* Optimize A / A to 1.0 if we don't care about
162 NaNs or Infinities. */
165 (if (FLOAT_TYPE_P (type)
166 && ! HONOR_NANS (type)
167 && ! HONOR_INFINITIES (type))
168 { build_one_cst (type); }))
170 /* Optimize -A / A to -1.0 if we don't care about
171 NaNs or Infinities. */
173 (rdiv:c @0 (negate @0))
174 (if (FLOAT_TYPE_P (type)
175 && ! HONOR_NANS (type)
176 && ! HONOR_INFINITIES (type))
177 { build_minus_one_cst (type); }))
179 /* In IEEE floating point, x/1 is not equivalent to x for snans. */
182 (if (!HONOR_SNANS (type))
185 /* In IEEE floating point, x/-1 is not equivalent to -x for snans. */
187 (rdiv @0 real_minus_onep)
188 (if (!HONOR_SNANS (type))
191 /* If ARG1 is a constant, we can convert this to a multiply by the
192 reciprocal. This does not have the same rounding properties,
193 so only do this if -freciprocal-math. We can actually
194 always safely do it if ARG1 is a power of two, but it's hard to
195 tell if it is or not in a portable manner. */
196 (for cst (REAL_CST COMPLEX_CST VECTOR_CST)
200 (if (flag_reciprocal_math
203 { tree tem = const_binop (RDIV_EXPR, type, build_one_cst (type), @1); }
205 (mult @0 { tem; } )))
206 (if (cst != COMPLEX_CST)
207 (with { tree inverse = exact_inverse (type, @1); }
209 (mult @0 { inverse; } ))))))))
211 /* Same applies to modulo operations, but fold is inconsistent here
212 and simplifies 0 % x to 0, only preserving literal 0 % 0. */
213 (for mod (ceil_mod floor_mod round_mod trunc_mod)
214 /* 0 % X is always zero. */
216 (mod integer_zerop@0 @1)
217 /* But not for 0 % 0 so that we can get the proper warnings and errors. */
218 (if (!integer_zerop (@1))
220 /* X % 1 is always zero. */
222 (mod @0 integer_onep)
223 { build_zero_cst (type); })
224 /* X % -1 is zero. */
226 (mod @0 integer_minus_onep@1)
227 (if (!TYPE_UNSIGNED (type))
228 { build_zero_cst (type); }))
229 /* (X % Y) % Y is just X % Y. */
231 (mod (mod@2 @0 @1) @1)
233 /* From extract_muldiv_1: (X * C1) % C2 is zero if C1 is a multiple of C2. */
235 (mod (mult @0 INTEGER_CST@1) INTEGER_CST@2)
236 (if (ANY_INTEGRAL_TYPE_P (type)
237 && TYPE_OVERFLOW_UNDEFINED (type)
238 && wi::multiple_of_p (@1, @2, TYPE_SIGN (type)))
239 { build_zero_cst (type); })))
241 /* X % -C is the same as X % C. */
243 (trunc_mod @0 INTEGER_CST@1)
244 (if (TYPE_SIGN (type) == SIGNED
245 && !TREE_OVERFLOW (@1)
247 && !TYPE_OVERFLOW_TRAPS (type)
248 /* Avoid this transformation if C is INT_MIN, i.e. C == -C. */
249 && !sign_bit_p (@1, @1))
250 (trunc_mod @0 (negate @1))))
252 /* X % -Y is the same as X % Y. */
254 (trunc_mod @0 (convert? (negate @1)))
255 (if (!TYPE_UNSIGNED (type)
256 && !TYPE_OVERFLOW_TRAPS (type)
257 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
258 (trunc_mod @0 (convert @1))))
260 /* X - (X / Y) * Y is the same as X % Y. */
262 (minus (convert1? @0) (convert2? (mult (trunc_div @0 @1) @1)))
263 (if (INTEGRAL_TYPE_P (type) || VECTOR_INTEGER_TYPE_P (type))
264 (trunc_mod (convert @0) (convert @1))))
266 /* Optimize TRUNC_MOD_EXPR by a power of two into a BIT_AND_EXPR,
267 i.e. "X % C" into "X & (C - 1)", if X and C are positive.
268 Also optimize A % (C << N) where C is a power of 2,
269 to A & ((C << N) - 1). */
270 (match (power_of_two_cand @1)
272 (match (power_of_two_cand @1)
273 (lshift INTEGER_CST@1 @2))
274 (for mod (trunc_mod floor_mod)
276 (mod @0 (convert?@3 (power_of_two_cand@1 @2)))
277 (if ((TYPE_UNSIGNED (type)
278 || tree_expr_nonnegative_p (@0))
279 && tree_nop_conversion_p (type, TREE_TYPE (@3))
280 && integer_pow2p (@2) && tree_int_cst_sgn (@2) > 0)
281 (bit_and @0 (convert (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))))
283 /* X % Y is smaller than Y. */
286 (cmp (trunc_mod @0 @1) @1)
287 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
288 { constant_boolean_node (cmp == LT_EXPR, type); })))
291 (cmp @1 (trunc_mod @0 @1))
292 (if (TYPE_UNSIGNED (TREE_TYPE (@0)))
293 { constant_boolean_node (cmp == GT_EXPR, type); })))
297 (bit_ior @0 integer_all_onesp@1)
302 (bit_and @0 integer_zerop@1)
308 (for op (bit_ior bit_xor plus)
310 (op:c (convert? @0) (convert? (bit_not @0)))
311 (convert { build_all_ones_cst (TREE_TYPE (@0)); })))
316 { build_zero_cst (type); })
318 /* Canonicalize X ^ ~0 to ~X. */
320 (bit_xor @0 integer_all_onesp@1)
325 (bit_and @0 integer_all_onesp)
328 /* x & x -> x, x | x -> x */
329 (for bitop (bit_and bit_ior)
334 /* x + (x & 1) -> (x + 1) & ~1 */
336 (plus:c @0 (bit_and:s @0 integer_onep@1))
337 (bit_and (plus @0 @1) (bit_not @1)))
339 /* x & ~(x & y) -> x & ~y */
340 /* x | ~(x | y) -> x | ~y */
341 (for bitop (bit_and bit_ior)
343 (bitop:c @0 (bit_not (bitop:cs @0 @1)))
344 (bitop @0 (bit_not @1))))
346 /* (x | y) & ~x -> y & ~x */
347 /* (x & y) | ~x -> y | ~x */
348 (for bitop (bit_and bit_ior)
349 rbitop (bit_ior bit_and)
351 (bitop:c (rbitop:c @0 @1) (bit_not@2 @0))
354 /* (x & y) ^ (x | y) -> x ^ y */
356 (bit_xor:c (bit_and @0 @1) (bit_ior @0 @1))
359 /* (x ^ y) ^ (x | y) -> x & y */
361 (bit_xor:c (bit_xor @0 @1) (bit_ior @0 @1))
364 /* (x & y) + (x ^ y) -> x | y */
365 /* (x & y) | (x ^ y) -> x | y */
366 /* (x & y) ^ (x ^ y) -> x | y */
367 (for op (plus bit_ior bit_xor)
369 (op:c (bit_and @0 @1) (bit_xor @0 @1))
372 /* (x & y) + (x | y) -> x + y */
374 (plus:c (bit_and @0 @1) (bit_ior @0 @1))
377 /* (x + y) - (x | y) -> x & y */
379 (minus (plus @0 @1) (bit_ior @0 @1))
380 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
381 && !TYPE_SATURATING (type))
384 /* (x + y) - (x & y) -> x | y */
386 (minus (plus @0 @1) (bit_and @0 @1))
387 (if (!TYPE_OVERFLOW_SANITIZED (type) && !TYPE_OVERFLOW_TRAPS (type)
388 && !TYPE_SATURATING (type))
391 /* (x | y) - (x ^ y) -> x & y */
393 (minus (bit_ior @0 @1) (bit_xor @0 @1))
396 /* (x | y) - (x & y) -> x ^ y */
398 (minus (bit_ior @0 @1) (bit_and @0 @1))
401 /* (x | y) & ~(x & y) -> x ^ y */
403 (bit_and:c (bit_ior @0 @1) (bit_not (bit_and @0 @1)))
406 /* (x | y) & (~x ^ y) -> x & y */
408 (bit_and:c (bit_ior:c @0 @1) (bit_xor:c @1 (bit_not @0)))
411 /* ~x & ~y -> ~(x | y)
412 ~x | ~y -> ~(x & y) */
413 (for op (bit_and bit_ior)
414 rop (bit_ior bit_and)
416 (op (convert1? (bit_not @0)) (convert2? (bit_not @1)))
417 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
418 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
419 (bit_not (rop (convert @0) (convert @1))))))
421 /* If we are XORing or adding two BIT_AND_EXPR's, both of which are and'ing
422 with a constant, and the two constants have no bits in common,
423 we should treat this as a BIT_IOR_EXPR since this may produce more
425 (for op (bit_xor plus)
427 (op (convert1? (bit_and@4 @0 INTEGER_CST@1))
428 (convert2? (bit_and@5 @2 INTEGER_CST@3)))
429 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
430 && tree_nop_conversion_p (type, TREE_TYPE (@2))
431 && wi::bit_and (@1, @3) == 0)
432 (bit_ior (convert @4) (convert @5)))))
434 /* (X | Y) ^ X -> Y & ~ X*/
436 (bit_xor:c (convert? (bit_ior:c @0 @1)) (convert? @0))
437 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
438 (convert (bit_and @1 (bit_not @0)))))
440 /* Convert ~X ^ ~Y to X ^ Y. */
442 (bit_xor (convert1? (bit_not @0)) (convert2? (bit_not @1)))
443 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
444 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
445 (bit_xor (convert @0) (convert @1))))
447 /* Convert ~X ^ C to X ^ ~C. */
449 (bit_xor (convert? (bit_not @0)) INTEGER_CST@1)
450 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
451 (bit_xor (convert @0) (bit_not @1))))
453 /* Fold (X & Y) ^ Y as ~X & Y. */
455 (bit_xor:c (bit_and:c @0 @1) @1)
456 (bit_and (bit_not @0) @1))
458 /* Given a bit-wise operation CODE applied to ARG0 and ARG1, see if both
459 operands are another bit-wise operation with a common input. If so,
460 distribute the bit operations to save an operation and possibly two if
461 constants are involved. For example, convert
462 (A | B) & (A | C) into A | (B & C)
463 Further simplification will occur if B and C are constants. */
464 (for op (bit_and bit_ior)
465 rop (bit_ior bit_and)
467 (op (convert? (rop:c @0 @1)) (convert? (rop @0 @2)))
468 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
469 (rop (convert @0) (op (convert @1) (convert @2))))))
479 (abs tree_expr_nonnegative_p@0)
482 /* A few cases of fold-const.c negate_expr_p predicate. */
485 (if ((INTEGRAL_TYPE_P (type)
486 && TYPE_OVERFLOW_WRAPS (type))
487 || (!TYPE_OVERFLOW_SANITIZED (type)
488 && may_negate_without_overflow_p (t)))))
493 (if (!TYPE_OVERFLOW_SANITIZED (type))))
496 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (t)))))
497 /* VECTOR_CST handling of non-wrapping types would recurse in unsupported
501 (if (FLOAT_TYPE_P (TREE_TYPE (type)) || TYPE_OVERFLOW_WRAPS (type))))
503 /* -(A + B) -> (-B) - A. */
505 (negate (plus:c @0 negate_expr_p@1))
506 (if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type))
507 && !HONOR_SIGNED_ZEROS (element_mode (type)))
508 (minus (negate @1) @0)))
510 /* A - B -> A + (-B) if B is easily negatable. */
512 (minus @0 negate_expr_p@1)
513 (if (!FIXED_POINT_TYPE_P (type))
514 (plus @0 (negate @1))))
516 /* Try to fold (type) X op CST -> (type) (X op ((type-x) CST))
518 For bitwise binary operations apply operand conversions to the
519 binary operation result instead of to the operands. This allows
520 to combine successive conversions and bitwise binary operations.
521 We combine the above two cases by using a conditional convert. */
522 (for bitop (bit_and bit_ior bit_xor)
524 (bitop (convert @0) (convert? @1))
525 (if (((TREE_CODE (@1) == INTEGER_CST
526 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
527 && int_fits_type_p (@1, TREE_TYPE (@0)))
528 || types_match (@0, @1))
529 /* ??? This transform conflicts with fold-const.c doing
530 Convert (T)(x & c) into (T)x & (T)c, if c is an integer
531 constants (if x has signed type, the sign bit cannot be set
532 in c). This folds extension into the BIT_AND_EXPR.
533 Restrict it to GIMPLE to avoid endless recursions. */
534 && (bitop != BIT_AND_EXPR || GIMPLE)
535 && (/* That's a good idea if the conversion widens the operand, thus
536 after hoisting the conversion the operation will be narrower. */
537 TYPE_PRECISION (TREE_TYPE (@0)) < TYPE_PRECISION (type)
538 /* It's also a good idea if the conversion is to a non-integer
540 || GET_MODE_CLASS (TYPE_MODE (type)) != MODE_INT
541 /* Or if the precision of TO is not the same as the precision
543 || TYPE_PRECISION (type) != GET_MODE_PRECISION (TYPE_MODE (type))))
544 (convert (bitop @0 (convert @1))))))
546 (for bitop (bit_and bit_ior)
547 rbitop (bit_ior bit_and)
548 /* (x | y) & x -> x */
549 /* (x & y) | x -> x */
551 (bitop:c (rbitop:c @0 @1) @0)
553 /* (~x | y) & x -> x & y */
554 /* (~x & y) | x -> x | y */
556 (bitop:c (rbitop:c (bit_not @0) @1) @0)
559 /* Simplify (A & B) OP0 (C & B) to (A OP0 C) & B. */
560 (for bitop (bit_and bit_ior bit_xor)
562 (bitop (bit_and:c @0 @1) (bit_and @2 @1))
563 (bit_and (bitop @0 @2) @1)))
565 /* (x | CST1) & CST2 -> (x & CST2) | (CST1 & CST2) */
567 (bit_and (bit_ior @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
568 (bit_ior (bit_and @0 @2) (bit_and @1 @2)))
570 /* Combine successive equal operations with constants. */
571 (for bitop (bit_and bit_ior bit_xor)
573 (bitop (bitop @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
574 (bitop @0 (bitop @1 @2))))
576 /* Try simple folding for X op !X, and X op X with the help
577 of the truth_valued_p and logical_inverted_value predicates. */
578 (match truth_valued_p
580 (if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) == 1)))
581 (for op (tcc_comparison truth_and truth_andif truth_or truth_orif truth_xor)
582 (match truth_valued_p
584 (match truth_valued_p
587 (match (logical_inverted_value @0)
588 (bit_not truth_valued_p@0))
589 (match (logical_inverted_value @0)
590 (eq @0 integer_zerop))
591 (match (logical_inverted_value @0)
592 (ne truth_valued_p@0 integer_truep))
593 (match (logical_inverted_value @0)
594 (bit_xor truth_valued_p@0 integer_truep))
598 (bit_and:c @0 (logical_inverted_value @0))
599 { build_zero_cst (type); })
600 /* X | !X and X ^ !X -> 1, , if X is truth-valued. */
601 (for op (bit_ior bit_xor)
603 (op:c truth_valued_p@0 (logical_inverted_value @0))
604 { constant_boolean_node (true, type); }))
606 /* If arg1 and arg2 are booleans (or any single bit type)
607 then try to simplify:
614 But only do this if our result feeds into a comparison as
615 this transformation is not always a win, particularly on
616 targets with and-not instructions.
617 -> simplify_bitwise_binary_boolean */
619 (ne (bit_and:c (bit_not @0) @1) integer_zerop)
620 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
621 && TYPE_PRECISION (TREE_TYPE (@1)) == 1)
624 (ne (bit_ior:c (bit_not @0) @1) integer_zerop)
625 (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
626 && TYPE_PRECISION (TREE_TYPE (@1)) == 1)
631 (bit_not (bit_not @0))
634 /* Convert ~ (-A) to A - 1. */
636 (bit_not (convert? (negate @0)))
637 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
638 (convert (minus @0 { build_each_one_cst (TREE_TYPE (@0)); }))))
640 /* Convert ~ (A - 1) or ~ (A + -1) to -A. */
642 (bit_not (convert? (minus @0 integer_each_onep)))
643 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
644 (convert (negate @0))))
646 (bit_not (convert? (plus @0 integer_all_onesp)))
647 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
648 (convert (negate @0))))
650 /* Part of convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
652 (bit_not (convert? (bit_xor @0 INTEGER_CST@1)))
653 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
654 (convert (bit_xor @0 (bit_not @1)))))
656 (bit_not (convert? (bit_xor:c (bit_not @0) @1)))
657 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
658 (convert (bit_xor @0 @1))))
660 /* (x & ~m) | (y & m) -> ((x ^ y) & m) ^ x */
662 (bit_ior:c (bit_and:cs @0 (bit_not @2)) (bit_and:cs @1 @2))
663 (bit_xor (bit_and (bit_xor @0 @1) @2) @0))
665 /* Fold A - (A & B) into ~B & A. */
667 (minus (convert? @0) (convert?:s (bit_and:cs @0 @1)))
668 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
669 && tree_nop_conversion_p (type, TREE_TYPE (@1)))
670 (convert (bit_and (bit_not @1) @0))))
672 /* Associate (p +p off1) +p off2 as (p +p (off1 + off2)). */
674 (pointer_plus (pointer_plus:s @0 @1) @3)
675 (pointer_plus @0 (plus @1 @3)))
681 tem4 = (unsigned long) tem3;
686 (pointer_plus @0 (convert?@2 (minus@3 (convert @1) (convert @0))))
687 /* Conditionally look through a sign-changing conversion. */
688 (if (TYPE_PRECISION (TREE_TYPE (@2)) == TYPE_PRECISION (TREE_TYPE (@3))
689 && ((GIMPLE && useless_type_conversion_p (type, TREE_TYPE (@1)))
690 || (GENERIC && type == TREE_TYPE (@1))))
694 tem = (sizetype) ptr;
698 and produce the simpler and easier to analyze with respect to alignment
699 ... = ptr & ~algn; */
701 (pointer_plus @0 (negate (bit_and (convert @0) INTEGER_CST@1)))
702 (with { tree algn = wide_int_to_tree (TREE_TYPE (@0), wi::bit_not (@1)); }
703 (bit_and @0 { algn; })))
705 /* Try folding difference of addresses. */
707 (minus (convert ADDR_EXPR@0) (convert @1))
708 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
709 (with { HOST_WIDE_INT diff; }
710 (if (ptr_difference_const (@0, @1, &diff))
711 { build_int_cst_type (type, diff); }))))
713 (minus (convert @0) (convert ADDR_EXPR@1))
714 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
715 (with { HOST_WIDE_INT diff; }
716 (if (ptr_difference_const (@0, @1, &diff))
717 { build_int_cst_type (type, diff); }))))
719 /* If arg0 is derived from the address of an object or function, we may
720 be able to fold this expression using the object or function's
723 (bit_and (convert? @0) INTEGER_CST@1)
724 (if (POINTER_TYPE_P (TREE_TYPE (@0))
725 && tree_nop_conversion_p (type, TREE_TYPE (@0)))
729 unsigned HOST_WIDE_INT bitpos;
730 get_pointer_alignment_1 (@0, &align, &bitpos);
732 (if (wi::ltu_p (@1, align / BITS_PER_UNIT))
733 { wide_int_to_tree (type, wi::bit_and (@1, bitpos / BITS_PER_UNIT)); }))))
736 /* We can't reassociate at all for saturating types. */
737 (if (!TYPE_SATURATING (type))
739 /* Contract negates. */
740 /* A + (-B) -> A - B */
742 (plus:c (convert1? @0) (convert2? (negate @1)))
743 /* Apply STRIP_NOPS on @0 and the negate. */
744 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
745 && tree_nop_conversion_p (type, TREE_TYPE (@1))
746 && !TYPE_OVERFLOW_SANITIZED (type))
747 (minus (convert @0) (convert @1))))
748 /* A - (-B) -> A + B */
750 (minus (convert1? @0) (convert2? (negate @1)))
751 (if (tree_nop_conversion_p (type, TREE_TYPE (@0))
752 && tree_nop_conversion_p (type, TREE_TYPE (@1))
753 && !TYPE_OVERFLOW_SANITIZED (type))
754 (plus (convert @0) (convert @1))))
757 (negate (convert? (negate @1)))
758 (if (tree_nop_conversion_p (type, TREE_TYPE (@1))
759 && !TYPE_OVERFLOW_SANITIZED (type))
762 /* We can't reassociate floating-point unless -fassociative-math
763 or fixed-point plus or minus because of saturation to +-Inf. */
764 (if ((!FLOAT_TYPE_P (type) || flag_associative_math)
765 && !FIXED_POINT_TYPE_P (type))
767 /* Match patterns that allow contracting a plus-minus pair
768 irrespective of overflow issues. */
769 /* (A +- B) - A -> +- B */
770 /* (A +- B) -+ B -> A */
771 /* A - (A +- B) -> -+ B */
772 /* A +- (B -+ A) -> +- B */
774 (minus (plus:c @0 @1) @0)
777 (minus (minus @0 @1) @0)
780 (plus:c (minus @0 @1) @1)
783 (minus @0 (plus:c @0 @1))
786 (minus @0 (minus @0 @1))
789 /* (A +- CST) +- CST -> A + CST */
790 (for outer_op (plus minus)
791 (for inner_op (plus minus)
793 (outer_op (inner_op @0 CONSTANT_CLASS_P@1) CONSTANT_CLASS_P@2)
794 /* If the constant operation overflows we cannot do the transform
795 as we would introduce undefined overflow, for example
796 with (a - 1) + INT_MIN. */
797 (with { tree cst = fold_binary (outer_op == inner_op
798 ? PLUS_EXPR : MINUS_EXPR, type, @1, @2); }
799 (if (cst && !TREE_OVERFLOW (cst))
800 (inner_op @0 { cst; } ))))))
802 /* (CST - A) +- CST -> CST - A */
803 (for outer_op (plus minus)
805 (outer_op (minus CONSTANT_CLASS_P@1 @0) CONSTANT_CLASS_P@2)
806 (with { tree cst = fold_binary (outer_op, type, @1, @2); }
807 (if (cst && !TREE_OVERFLOW (cst))
808 (minus { cst; } @0)))))
812 (plus:c (bit_not @0) @0)
813 (if (!TYPE_OVERFLOW_TRAPS (type))
814 { build_all_ones_cst (type); }))
818 (plus (convert? (bit_not @0)) integer_each_onep)
819 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
820 (negate (convert @0))))
824 (minus (convert? (negate @0)) integer_each_onep)
825 (if (!TYPE_OVERFLOW_TRAPS (type)
826 && tree_nop_conversion_p (type, TREE_TYPE (@0)))
827 (bit_not (convert @0))))
831 (minus integer_all_onesp @0)
834 /* (T)(P + A) - (T)P -> (T) A */
835 (for add (plus pointer_plus)
837 (minus (convert (add @0 @1))
839 (if (element_precision (type) <= element_precision (TREE_TYPE (@1))
840 /* For integer types, if A has a smaller type
841 than T the result depends on the possible
843 E.g. T=size_t, A=(unsigned)429497295, P>0.
844 However, if an overflow in P + A would cause
845 undefined behavior, we can assume that there
847 || (INTEGRAL_TYPE_P (TREE_TYPE (@0))
848 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
849 /* For pointer types, if the conversion of A to the
850 final type requires a sign- or zero-extension,
851 then we have to punt - it is not defined which
853 || (POINTER_TYPE_P (TREE_TYPE (@0))
854 && TREE_CODE (@1) == INTEGER_CST
855 && tree_int_cst_sign_bit (@1) == 0))
859 /* Simplifications of MIN_EXPR and MAX_EXPR. */
861 (for minmax (min max)
867 (if (INTEGRAL_TYPE_P (type)
868 && TYPE_MIN_VALUE (type)
869 && operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
873 (if (INTEGRAL_TYPE_P (type)
874 && TYPE_MAX_VALUE (type)
875 && operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
879 /* Simplifications of shift and rotates. */
881 (for rotate (lrotate rrotate)
883 (rotate integer_all_onesp@0 @1)
886 /* Optimize -1 >> x for arithmetic right shifts. */
888 (rshift integer_all_onesp@0 @1)
889 (if (!TYPE_UNSIGNED (type)
890 && tree_expr_nonnegative_p (@1))
893 (for shiftrotate (lrotate rrotate lshift rshift)
895 (shiftrotate @0 integer_zerop)
898 (shiftrotate integer_zerop@0 @1)
900 /* Prefer vector1 << scalar to vector1 << vector2
901 if vector2 is uniform. */
902 (for vec (VECTOR_CST CONSTRUCTOR)
904 (shiftrotate @0 vec@1)
905 (with { tree tem = uniform_vector_p (@1); }
907 (shiftrotate @0 { tem; }))))))
909 /* Rewrite an LROTATE_EXPR by a constant into an
910 RROTATE_EXPR by a new constant. */
912 (lrotate @0 INTEGER_CST@1)
913 (rrotate @0 { fold_binary (MINUS_EXPR, TREE_TYPE (@1),
914 build_int_cst (TREE_TYPE (@1),
915 element_precision (type)), @1); }))
917 /* Turn (a OP c1) OP c2 into a OP (c1+c2). */
918 (for op (lrotate rrotate rshift lshift)
920 (op (op @0 INTEGER_CST@1) INTEGER_CST@2)
921 (with { unsigned int prec = element_precision (type); }
922 (if (wi::ge_p (@1, 0, TYPE_SIGN (TREE_TYPE (@1)))
923 && wi::lt_p (@1, prec, TYPE_SIGN (TREE_TYPE (@1)))
924 && wi::ge_p (@2, 0, TYPE_SIGN (TREE_TYPE (@2)))
925 && wi::lt_p (@2, prec, TYPE_SIGN (TREE_TYPE (@2))))
926 (with { unsigned int low = wi::add (@1, @2).to_uhwi (); }
927 /* Deal with a OP (c1 + c2) being undefined but (a OP c1) OP c2
928 being well defined. */
930 (if (op == LROTATE_EXPR || op == RROTATE_EXPR)
931 (op @0 { build_int_cst (TREE_TYPE (@1), low % prec); })
932 (if (TYPE_UNSIGNED (type) || code == LSHIFT_EXPR)
933 { build_zero_cst (type); }
934 (op @0 { build_int_cst (TREE_TYPE (@1), prec - 1); })))
935 (op @0 { build_int_cst (TREE_TYPE (@1), low); })))))))
938 /* ((1 << A) & 1) != 0 -> A == 0
939 ((1 << A) & 1) == 0 -> A != 0 */
943 (cmp (bit_and (lshift integer_onep @0) integer_onep) integer_zerop)
944 (icmp @0 { build_zero_cst (TREE_TYPE (@0)); })))
946 /* (CST1 << A) == CST2 -> A == ctz (CST2) - ctz (CST1)
947 (CST1 << A) != CST2 -> A != ctz (CST2) - ctz (CST1)
951 (cmp (lshift INTEGER_CST@0 @1) INTEGER_CST@2)
952 (with { int cand = wi::ctz (@2) - wi::ctz (@0); }
954 || (!integer_zerop (@2)
955 && wi::ne_p (wi::lshift (@0, cand), @2)))
956 { constant_boolean_node (cmp == NE_EXPR, type); }
957 (if (!integer_zerop (@2)
958 && wi::eq_p (wi::lshift (@0, cand), @2))
959 (cmp @1 { build_int_cst (TREE_TYPE (@1), cand); }))))))
961 /* Fold (X << C1) & C2 into (X << C1) & (C2 | ((1 << C1) - 1))
962 (X >> C1) & C2 into (X >> C1) & (C2 | ~((type) -1 >> C1))
963 if the new mask might be further optimized. */
964 (for shift (lshift rshift)
966 (bit_and (convert?:s@4 (shift:s@5 (convert1?@3 @0) INTEGER_CST@1))
968 (if (tree_nop_conversion_p (TREE_TYPE (@4), TREE_TYPE (@5))
969 && TYPE_PRECISION (type) <= HOST_BITS_PER_WIDE_INT
970 && tree_fits_uhwi_p (@1)
971 && tree_to_uhwi (@1) > 0
972 && tree_to_uhwi (@1) < TYPE_PRECISION (type))
975 unsigned int shiftc = tree_to_uhwi (@1);
976 unsigned HOST_WIDE_INT mask = TREE_INT_CST_LOW (@2);
977 unsigned HOST_WIDE_INT newmask, zerobits = 0;
978 tree shift_type = TREE_TYPE (@3);
981 if (shift == LSHIFT_EXPR)
982 zerobits = ((((unsigned HOST_WIDE_INT) 1) << shiftc) - 1);
983 else if (shift == RSHIFT_EXPR
984 && (TYPE_PRECISION (shift_type)
985 == GET_MODE_PRECISION (TYPE_MODE (shift_type))))
987 prec = TYPE_PRECISION (TREE_TYPE (@3));
989 /* See if more bits can be proven as zero because of
992 && TYPE_UNSIGNED (TREE_TYPE (@0)))
994 tree inner_type = TREE_TYPE (@0);
995 if ((TYPE_PRECISION (inner_type)
996 == GET_MODE_PRECISION (TYPE_MODE (inner_type)))
997 && TYPE_PRECISION (inner_type) < prec)
999 prec = TYPE_PRECISION (inner_type);
1000 /* See if we can shorten the right shift. */
1002 shift_type = inner_type;
1003 /* Otherwise X >> C1 is all zeros, so we'll optimize
1004 it into (X, 0) later on by making sure zerobits
1008 zerobits = ~(unsigned HOST_WIDE_INT) 0;
1011 zerobits >>= HOST_BITS_PER_WIDE_INT - shiftc;
1012 zerobits <<= prec - shiftc;
1014 /* For arithmetic shift if sign bit could be set, zerobits
1015 can contain actually sign bits, so no transformation is
1016 possible, unless MASK masks them all away. In that
1017 case the shift needs to be converted into logical shift. */
1018 if (!TYPE_UNSIGNED (TREE_TYPE (@3))
1019 && prec == TYPE_PRECISION (TREE_TYPE (@3)))
1021 if ((mask & zerobits) == 0)
1022 shift_type = unsigned_type_for (TREE_TYPE (@3));
1028 /* ((X << 16) & 0xff00) is (X, 0). */
1029 (if ((mask & zerobits) == mask)
1030 { build_int_cst (type, 0); }
1031 (with { newmask = mask | zerobits; }
1032 (if (newmask != mask && (newmask & (newmask + 1)) == 0)
1035 /* Only do the transformation if NEWMASK is some integer
1037 for (prec = BITS_PER_UNIT;
1038 prec < HOST_BITS_PER_WIDE_INT; prec <<= 1)
1039 if (newmask == (((unsigned HOST_WIDE_INT) 1) << prec) - 1)
1042 (if (prec < HOST_BITS_PER_WIDE_INT
1043 || newmask == ~(unsigned HOST_WIDE_INT) 0)
1045 { tree newmaskt = build_int_cst_type (TREE_TYPE (@2), newmask); }
1046 (if (!tree_int_cst_equal (newmaskt, @2))
1047 (if (shift_type != TREE_TYPE (@3))
1048 (bit_and (convert (shift:shift_type (convert @3) @1)) { newmaskt; })
1049 (bit_and @4 { newmaskt; })))))))))))))
1051 /* Fold (X & C2) << C1 into (X << C1) & (C2 << C1)
1052 (X & C2) >> C1 into (X >> C1) & (C2 >> C1). */
1053 (for shift (lshift rshift)
1055 (shift (convert?:s (bit_and:s @0 INTEGER_CST@2)) INTEGER_CST@1)
1056 (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
1057 (with { tree mask = int_const_binop (shift, fold_convert (type, @2), @1); }
1058 (bit_and (shift (convert @0) @1) { mask; })))))
1061 /* Simplifications of conversions. */
1063 /* Basic strip-useless-type-conversions / strip_nops. */
1064 (for cvt (convert view_convert float fix_trunc)
1067 (if ((GIMPLE && useless_type_conversion_p (type, TREE_TYPE (@0)))
1068 || (GENERIC && type == TREE_TYPE (@0)))
1071 /* Contract view-conversions. */
1073 (view_convert (view_convert @0))
1076 /* For integral conversions with the same precision or pointer
1077 conversions use a NOP_EXPR instead. */
1080 (if ((INTEGRAL_TYPE_P (type) || POINTER_TYPE_P (type))
1081 && (INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
1082 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (@0)))
1085 /* Strip inner integral conversions that do not change precision or size. */
1087 (view_convert (convert@0 @1))
1088 (if ((INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
1089 && (INTEGRAL_TYPE_P (TREE_TYPE (@1)) || POINTER_TYPE_P (TREE_TYPE (@1)))
1090 && (TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
1091 && (TYPE_SIZE (TREE_TYPE (@0)) == TYPE_SIZE (TREE_TYPE (@1))))
1094 /* Re-association barriers around constants and other re-association
1095 barriers can be removed. */
1097 (paren CONSTANT_CLASS_P@0)
1100 (paren (paren@1 @0))
1103 /* Handle cases of two conversions in a row. */
1104 (for ocvt (convert float fix_trunc)
1105 (for icvt (convert float)
1110 tree inside_type = TREE_TYPE (@0);
1111 tree inter_type = TREE_TYPE (@1);
1112 int inside_int = INTEGRAL_TYPE_P (inside_type);
1113 int inside_ptr = POINTER_TYPE_P (inside_type);
1114 int inside_float = FLOAT_TYPE_P (inside_type);
1115 int inside_vec = VECTOR_TYPE_P (inside_type);
1116 unsigned int inside_prec = TYPE_PRECISION (inside_type);
1117 int inside_unsignedp = TYPE_UNSIGNED (inside_type);
1118 int inter_int = INTEGRAL_TYPE_P (inter_type);
1119 int inter_ptr = POINTER_TYPE_P (inter_type);
1120 int inter_float = FLOAT_TYPE_P (inter_type);
1121 int inter_vec = VECTOR_TYPE_P (inter_type);
1122 unsigned int inter_prec = TYPE_PRECISION (inter_type);
1123 int inter_unsignedp = TYPE_UNSIGNED (inter_type);
1124 int final_int = INTEGRAL_TYPE_P (type);
1125 int final_ptr = POINTER_TYPE_P (type);
1126 int final_float = FLOAT_TYPE_P (type);
1127 int final_vec = VECTOR_TYPE_P (type);
1128 unsigned int final_prec = TYPE_PRECISION (type);
1129 int final_unsignedp = TYPE_UNSIGNED (type);
1132 /* In addition to the cases of two conversions in a row
1133 handled below, if we are converting something to its own
1134 type via an object of identical or wider precision, neither
1135 conversion is needed. */
1136 (if (((GIMPLE && useless_type_conversion_p (type, inside_type))
1138 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (inside_type)))
1139 && (((inter_int || inter_ptr) && final_int)
1140 || (inter_float && final_float))
1141 && inter_prec >= final_prec)
1144 /* Likewise, if the intermediate and initial types are either both
1145 float or both integer, we don't need the middle conversion if the
1146 former is wider than the latter and doesn't change the signedness
1147 (for integers). Avoid this if the final type is a pointer since
1148 then we sometimes need the middle conversion. Likewise if the
1149 final type has a precision not equal to the size of its mode. */
1150 (if (((inter_int && inside_int) || (inter_float && inside_float))
1151 && (final_int || final_float)
1152 && inter_prec >= inside_prec
1153 && (inter_float || inter_unsignedp == inside_unsignedp)
1154 && ! (final_prec != GET_MODE_PRECISION (TYPE_MODE (type))
1155 && TYPE_MODE (type) == TYPE_MODE (inter_type)))
1158 /* If we have a sign-extension of a zero-extended value, we can
1159 replace that by a single zero-extension. Likewise if the
1160 final conversion does not change precision we can drop the
1161 intermediate conversion. */
1162 (if (inside_int && inter_int && final_int
1163 && ((inside_prec < inter_prec && inter_prec < final_prec
1164 && inside_unsignedp && !inter_unsignedp)
1165 || final_prec == inter_prec))
1168 /* Two conversions in a row are not needed unless:
1169 - some conversion is floating-point (overstrict for now), or
1170 - some conversion is a vector (overstrict for now), or
1171 - the intermediate type is narrower than both initial and
1173 - the intermediate type and innermost type differ in signedness,
1174 and the outermost type is wider than the intermediate, or
1175 - the initial type is a pointer type and the precisions of the
1176 intermediate and final types differ, or
1177 - the final type is a pointer type and the precisions of the
1178 initial and intermediate types differ. */
1179 (if (! inside_float && ! inter_float && ! final_float
1180 && ! inside_vec && ! inter_vec && ! final_vec
1181 && (inter_prec >= inside_prec || inter_prec >= final_prec)
1182 && ! (inside_int && inter_int
1183 && inter_unsignedp != inside_unsignedp
1184 && inter_prec < final_prec)
1185 && ((inter_unsignedp && inter_prec > inside_prec)
1186 == (final_unsignedp && final_prec > inter_prec))
1187 && ! (inside_ptr && inter_prec != final_prec)
1188 && ! (final_ptr && inside_prec != inter_prec)
1189 && ! (final_prec != GET_MODE_PRECISION (TYPE_MODE (type))
1190 && TYPE_MODE (type) == TYPE_MODE (inter_type)))
1193 /* A truncation to an unsigned type (a zero-extension) should be
1194 canonicalized as bitwise and of a mask. */
1195 (if (final_int && inter_int && inside_int
1196 && final_prec == inside_prec
1197 && final_prec > inter_prec
1199 (convert (bit_and @0 { wide_int_to_tree
1201 wi::mask (inter_prec, false,
1202 TYPE_PRECISION (inside_type))); })))
1204 /* If we are converting an integer to a floating-point that can
1205 represent it exactly and back to an integer, we can skip the
1206 floating-point conversion. */
1207 (if (GIMPLE /* PR66211 */
1208 && inside_int && inter_float && final_int &&
1209 (unsigned) significand_size (TYPE_MODE (inter_type))
1210 >= inside_prec - !inside_unsignedp)
1213 /* If we have a narrowing conversion to an integral type that is fed by a
1214 BIT_AND_EXPR, we might be able to remove the BIT_AND_EXPR if it merely
1215 masks off bits outside the final type (and nothing else). */
1217 (convert (bit_and @0 INTEGER_CST@1))
1218 (if (INTEGRAL_TYPE_P (type)
1219 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
1220 && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))
1221 && operand_equal_p (@1, build_low_bits_mask (TREE_TYPE (@1),
1222 TYPE_PRECISION (type)), 0))
1226 /* (X /[ex] A) * A -> X. */
1228 (mult (convert? (exact_div @0 @1)) @1)
1229 /* Look through a sign-changing conversion. */
1232 /* Canonicalization of binary operations. */
1234 /* Convert X + -C into X - C. */
1236 (plus @0 REAL_CST@1)
1237 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
1238 (with { tree tem = fold_unary (NEGATE_EXPR, type, @1); }
1239 (if (!TREE_OVERFLOW (tem) || !flag_trapping_math)
1240 (minus @0 { tem; })))))
1242 /* Convert x+x into x*2.0. */
1245 (if (SCALAR_FLOAT_TYPE_P (type))
1246 (mult @0 { build_real (type, dconst2); })))
1249 (minus integer_zerop @1)
1252 /* (ARG0 - ARG1) is the same as (-ARG1 + ARG0). So check whether
1253 ARG0 is zero and X + ARG0 reduces to X, since that would mean
1254 (-ARG1 + ARG0) reduces to -ARG1. */
1256 (minus real_zerop@0 @1)
1257 (if (fold_real_zero_addition_p (type, @0, 0))
1260 /* Transform x * -1 into -x. */
1262 (mult @0 integer_minus_onep)
1265 /* COMPLEX_EXPR and REALPART/IMAGPART_EXPR cancellations. */
1267 (complex (realpart @0) (imagpart @0))
1270 (realpart (complex @0 @1))
1273 (imagpart (complex @0 @1))
1277 /* BSWAP simplifications, transforms checked by gcc.dg/builtin-bswap-8.c. */
1278 (for bswap (BUILT_IN_BSWAP16 BUILT_IN_BSWAP32 BUILT_IN_BSWAP64)
1283 (bswap (bit_not (bswap @0)))
1285 (for bitop (bit_xor bit_ior bit_and)
1287 (bswap (bitop:c (bswap @0) @1))
1288 (bitop @0 (bswap @1)))))
1291 /* Combine COND_EXPRs and VEC_COND_EXPRs. */
1293 /* Simplify constant conditions.
1294 Only optimize constant conditions when the selected branch
1295 has the same type as the COND_EXPR. This avoids optimizing
1296 away "c ? x : throw", where the throw has a void type.
1297 Note that we cannot throw away the fold-const.c variant nor
1298 this one as we depend on doing this transform before possibly
1299 A ? B : B -> B triggers and the fold-const.c one can optimize
1300 0 ? A : B to B even if A has side-effects. Something
1301 genmatch cannot handle. */
1303 (cond INTEGER_CST@0 @1 @2)
1304 (if (integer_zerop (@0))
1305 (if (!VOID_TYPE_P (TREE_TYPE (@2)) || VOID_TYPE_P (type))
1307 (if (!VOID_TYPE_P (TREE_TYPE (@1)) || VOID_TYPE_P (type))
1310 (vec_cond VECTOR_CST@0 @1 @2)
1311 (if (integer_all_onesp (@0))
1313 (if (integer_zerop (@0))
1316 (for cnd (cond vec_cond)
1317 /* A ? B : (A ? X : C) -> A ? B : C. */
1319 (cnd @0 (cnd @0 @1 @2) @3)
1322 (cnd @0 @1 (cnd @0 @2 @3))
1325 /* A ? B : B -> B. */
1330 /* !A ? B : C -> A ? C : B. */
1332 (cnd (logical_inverted_value truth_valued_p@0) @1 @2)
1335 /* A + (B vcmp C ? 1 : 0) -> A - (B vcmp C), since vector comparisons
1336 return all-1 or all-0 results. */
1337 /* ??? We could instead convert all instances of the vec_cond to negate,
1338 but that isn't necessarily a win on its own. */
1340 (plus:c @3 (view_convert? (vec_cond @0 integer_each_onep@1 integer_zerop@2)))
1341 (if (VECTOR_TYPE_P (type)
1342 && TYPE_VECTOR_SUBPARTS (type) == TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0))
1343 && (TYPE_MODE (TREE_TYPE (type))
1344 == TYPE_MODE (TREE_TYPE (TREE_TYPE (@0)))))
1345 (minus @3 (view_convert @0))))
1347 /* ... likewise A - (B vcmp C ? 1 : 0) -> A + (B vcmp C). */
1349 (minus @3 (view_convert? (vec_cond @0 integer_each_onep@1 integer_zerop@2)))
1350 (if (VECTOR_TYPE_P (type)
1351 && TYPE_VECTOR_SUBPARTS (type) == TYPE_VECTOR_SUBPARTS (TREE_TYPE (@0))
1352 && (TYPE_MODE (TREE_TYPE (type))
1353 == TYPE_MODE (TREE_TYPE (TREE_TYPE (@0)))))
1354 (plus @3 (view_convert @0))))
1357 /* Simplifications of comparisons. */
1359 /* We can simplify a logical negation of a comparison to the
1360 inverted comparison. As we cannot compute an expression
1361 operator using invert_tree_comparison we have to simulate
1362 that with expression code iteration. */
1363 (for cmp (tcc_comparison)
1364 icmp (inverted_tcc_comparison)
1365 ncmp (inverted_tcc_comparison_with_nans)
1366 /* Ideally we'd like to combine the following two patterns
1367 and handle some more cases by using
1368 (logical_inverted_value (cmp @0 @1))
1369 here but for that genmatch would need to "inline" that.
1370 For now implement what forward_propagate_comparison did. */
1372 (bit_not (cmp @0 @1))
1373 (if (VECTOR_TYPE_P (type)
1374 || (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) == 1))
1375 /* Comparison inversion may be impossible for trapping math,
1376 invert_tree_comparison will tell us. But we can't use
1377 a computed operator in the replacement tree thus we have
1378 to play the trick below. */
1379 (with { enum tree_code ic = invert_tree_comparison
1380 (cmp, HONOR_NANS (@0)); }
1386 (bit_xor (cmp @0 @1) integer_truep)
1387 (with { enum tree_code ic = invert_tree_comparison
1388 (cmp, HONOR_NANS (@0)); }
1394 /* Transform comparisons of the form X - Y CMP 0 to X CMP Y.
1395 ??? The transformation is valid for the other operators if overflow
1396 is undefined for the type, but performing it here badly interacts
1397 with the transformation in fold_cond_expr_with_comparison which
1398 attempts to synthetize ABS_EXPR. */
1401 (cmp (minus@2 @0 @1) integer_zerop)
1402 (if (single_use (@2))
1405 /* Transform comparisons of the form X * C1 CMP 0 to X CMP 0 in the
1406 signed arithmetic case. That form is created by the compiler
1407 often enough for folding it to be of value. One example is in
1408 computing loop trip counts after Operator Strength Reduction. */
1409 (for cmp (simple_comparison)
1410 scmp (swapped_simple_comparison)
1412 (cmp (mult @0 INTEGER_CST@1) integer_zerop@2)
1413 /* Handle unfolded multiplication by zero. */
1414 (if (integer_zerop (@1))
1416 (if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
1417 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
1418 /* If @1 is negative we swap the sense of the comparison. */
1419 (if (tree_int_cst_sgn (@1) < 0)
1423 /* Simplify comparison of something with itself. For IEEE
1424 floating-point, we can only do some of these simplifications. */
1427 (if (! FLOAT_TYPE_P (TREE_TYPE (@0))
1428 || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (@0))))
1429 { constant_boolean_node (true, type); }))
1438 || ! FLOAT_TYPE_P (TREE_TYPE (@0))
1439 || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (@0))))
1440 { constant_boolean_node (false, type); })))
1442 /* Fold ~X op ~Y as Y op X. */
1443 (for cmp (simple_comparison)
1445 (cmp (bit_not @0) (bit_not @1))
1448 /* Fold ~X op C as X op' ~C, where op' is the swapped comparison. */
1449 (for cmp (simple_comparison)
1450 scmp (swapped_simple_comparison)
1452 (cmp (bit_not @0) CONSTANT_CLASS_P@1)
1453 (if (TREE_CODE (@1) == INTEGER_CST || TREE_CODE (@1) == VECTOR_CST)
1454 (scmp @0 (bit_not @1)))))
1456 (for cmp (simple_comparison)
1457 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
1459 (cmp (convert@2 @0) (convert? @1))
1460 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
1461 && (DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@2))
1462 == DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@0)))
1463 && (DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@2))
1464 == DECIMAL_FLOAT_TYPE_P (TREE_TYPE (@1))))
1467 tree type1 = TREE_TYPE (@1);
1468 if (TREE_CODE (@1) == REAL_CST && !DECIMAL_FLOAT_TYPE_P (type1))
1470 REAL_VALUE_TYPE orig = TREE_REAL_CST (@1);
1471 if (TYPE_PRECISION (type1) > TYPE_PRECISION (float_type_node)
1472 && exact_real_truncate (TYPE_MODE (float_type_node), &orig))
1473 type1 = float_type_node;
1474 if (TYPE_PRECISION (type1) > TYPE_PRECISION (double_type_node)
1475 && exact_real_truncate (TYPE_MODE (double_type_node), &orig))
1476 type1 = double_type_node;
1479 = (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (type1)
1480 ? TREE_TYPE (@0) : type1);
1482 (if (TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (newtype))
1483 (cmp (convert:newtype @0) (convert:newtype @1))))))
1487 /* IEEE doesn't distinguish +0 and -0 in comparisons. */
1489 /* a CMP (-0) -> a CMP 0 */
1490 (if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (@1)))
1491 (cmp @0 { build_real (TREE_TYPE (@1), dconst0); }))
1492 /* x != NaN is always true, other ops are always false. */
1493 (if (REAL_VALUE_ISNAN (TREE_REAL_CST (@1))
1494 && ! HONOR_SNANS (@1))
1495 { constant_boolean_node (cmp == NE_EXPR, type); })
1496 /* Fold comparisons against infinity. */
1497 (if (REAL_VALUE_ISINF (TREE_REAL_CST (@1))
1498 && MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (@1))))
1501 REAL_VALUE_TYPE max;
1502 enum tree_code code = cmp;
1503 bool neg = REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1));
1505 code = swap_tree_comparison (code);
1508 /* x > +Inf is always false, if with ignore sNANs. */
1509 (if (code == GT_EXPR
1510 && ! HONOR_SNANS (@0))
1511 { constant_boolean_node (false, type); })
1512 (if (code == LE_EXPR)
1513 /* x <= +Inf is always true, if we don't case about NaNs. */
1514 (if (! HONOR_NANS (@0))
1515 { constant_boolean_node (true, type); }
1516 /* x <= +Inf is the same as x == x, i.e. isfinite(x). */
1518 /* x == +Inf and x >= +Inf are always equal to x > DBL_MAX. */
1519 (if (code == EQ_EXPR || code == GE_EXPR)
1520 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
1522 (lt @0 { build_real (TREE_TYPE (@0), max); })
1523 (gt @0 { build_real (TREE_TYPE (@0), max); }))))
1524 /* x < +Inf is always equal to x <= DBL_MAX. */
1525 (if (code == LT_EXPR)
1526 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
1528 (ge @0 { build_real (TREE_TYPE (@0), max); })
1529 (le @0 { build_real (TREE_TYPE (@0), max); }))))
1530 /* x != +Inf is always equal to !(x > DBL_MAX). */
1531 (if (code == NE_EXPR)
1532 (with { real_maxval (&max, neg, TYPE_MODE (TREE_TYPE (@0))); }
1533 (if (! HONOR_NANS (@0))
1535 (ge @0 { build_real (TREE_TYPE (@0), max); })
1536 (le @0 { build_real (TREE_TYPE (@0), max); }))
1538 (bit_xor (lt @0 { build_real (TREE_TYPE (@0), max); })
1539 { build_one_cst (type); })
1540 (bit_xor (gt @0 { build_real (TREE_TYPE (@0), max); })
1541 { build_one_cst (type); }))))))))))
1543 /* If this is a comparison of a real constant with a PLUS_EXPR
1544 or a MINUS_EXPR of a real constant, we can convert it into a
1545 comparison with a revised real constant as long as no overflow
1546 occurs when unsafe_math_optimizations are enabled. */
1547 (if (flag_unsafe_math_optimizations)
1548 (for op (plus minus)
1550 (cmp (op @0 REAL_CST@1) REAL_CST@2)
1553 tree tem = const_binop (op == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR,
1554 TREE_TYPE (@1), @2, @1);
1556 (if (!TREE_OVERFLOW (tem))
1557 (cmp @0 { tem; }))))))
1559 /* Likewise, we can simplify a comparison of a real constant with
1560 a MINUS_EXPR whose first operand is also a real constant, i.e.
1561 (c1 - x) < c2 becomes x > c1-c2. Reordering is allowed on
1562 floating-point types only if -fassociative-math is set. */
1563 (if (flag_associative_math)
1565 (cmp (minus REAL_CST@0 @1) REAL_CST@2)
1566 (with { tree tem = const_binop (MINUS_EXPR, TREE_TYPE (@1), @0, @2); }
1567 (if (!TREE_OVERFLOW (tem))
1568 (cmp { tem; } @1)))))
1570 /* Fold comparisons against built-in math functions. */
1571 (if (flag_unsafe_math_optimizations
1572 && ! flag_errno_math)
1575 (cmp (sq @0) REAL_CST@1)
1577 (if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (@1)))
1579 /* sqrt(x) < y is always false, if y is negative. */
1580 (if (cmp == EQ_EXPR || cmp == LT_EXPR || cmp == LE_EXPR)
1581 { constant_boolean_node (false, type); })
1582 /* sqrt(x) > y is always true, if y is negative and we
1583 don't care about NaNs, i.e. negative values of x. */
1584 (if (cmp == NE_EXPR || !HONOR_NANS (@0))
1585 { constant_boolean_node (true, type); })
1586 /* sqrt(x) > y is the same as x >= 0, if y is negative. */
1587 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })))
1588 (if (cmp == GT_EXPR || cmp == GE_EXPR)
1592 REAL_ARITHMETIC (c2, MULT_EXPR,
1593 TREE_REAL_CST (@1), TREE_REAL_CST (@1));
1594 real_convert (&c2, TYPE_MODE (TREE_TYPE (@0)), &c2);
1596 (if (REAL_VALUE_ISINF (c2))
1597 /* sqrt(x) > y is x == +Inf, when y is very large. */
1598 (if (HONOR_INFINITIES (@0))
1599 (eq @0 { build_real (TREE_TYPE (@0), c2); })
1600 { constant_boolean_node (false, type); })
1601 /* sqrt(x) > c is the same as x > c*c. */
1602 (cmp @0 { build_real (TREE_TYPE (@0), c2); }))))
1603 (if (cmp == LT_EXPR || cmp == LE_EXPR)
1607 REAL_ARITHMETIC (c2, MULT_EXPR,
1608 TREE_REAL_CST (@1), TREE_REAL_CST (@1));
1609 real_convert (&c2, TYPE_MODE (TREE_TYPE (@0)), &c2);
1611 (if (REAL_VALUE_ISINF (c2))
1613 /* sqrt(x) < y is always true, when y is a very large
1614 value and we don't care about NaNs or Infinities. */
1615 (if (! HONOR_NANS (@0) && ! HONOR_INFINITIES (@0))
1616 { constant_boolean_node (true, type); })
1617 /* sqrt(x) < y is x != +Inf when y is very large and we
1618 don't care about NaNs. */
1619 (if (! HONOR_NANS (@0))
1620 (ne @0 { build_real (TREE_TYPE (@0), c2); }))
1621 /* sqrt(x) < y is x >= 0 when y is very large and we
1622 don't care about Infinities. */
1623 (if (! HONOR_INFINITIES (@0))
1624 (ge @0 { build_real (TREE_TYPE (@0), dconst0); }))
1625 /* sqrt(x) < y is x >= 0 && x != +Inf, when y is large. */
1628 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })
1629 (ne @0 { build_real (TREE_TYPE (@0), c2); }))))
1630 /* sqrt(x) < c is the same as x < c*c, if we ignore NaNs. */
1631 (if (! HONOR_NANS (@0))
1632 (cmp @0 { build_real (TREE_TYPE (@0), c2); })
1633 /* sqrt(x) < c is the same as x >= 0 && x < c*c. */
1636 (ge @0 { build_real (TREE_TYPE (@0), dconst0); })
1637 (cmp @0 { build_real (TREE_TYPE (@0), c2); }))))))))))))
1639 /* Unordered tests if either argument is a NaN. */
1641 (bit_ior (unordered @0 @0) (unordered @1 @1))
1642 (if (types_match (@0, @1))
1645 (bit_and (ordered @0 @0) (ordered @1 @1))
1646 (if (types_match (@0, @1))
1649 (bit_ior:c (unordered @0 @0) (unordered:c@2 @0 @1))
1652 (bit_and:c (ordered @0 @0) (ordered:c@2 @0 @1))
1655 /* -A CMP -B -> B CMP A. */
1656 (for cmp (tcc_comparison)
1657 scmp (swapped_tcc_comparison)
1659 (cmp (negate @0) (negate @1))
1660 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
1661 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
1662 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))))
1665 (cmp (negate @0) CONSTANT_CLASS_P@1)
1666 (if (FLOAT_TYPE_P (TREE_TYPE (@0))
1667 || (ANY_INTEGRAL_TYPE_P (TREE_TYPE (@0))
1668 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))))
1669 (with { tree tem = fold_unary (NEGATE_EXPR, TREE_TYPE (@0), @1); }
1670 (if (tem && !TREE_OVERFLOW (tem))
1671 (scmp @0 { tem; }))))))
1673 /* From fold_sign_changed_comparison and fold_widened_comparison. */
1674 (for cmp (simple_comparison)
1676 (cmp (convert@0 @00) (convert?@1 @10))
1677 (if (TREE_CODE (TREE_TYPE (@0)) == INTEGER_TYPE
1678 /* Disable this optimization if we're casting a function pointer
1679 type on targets that require function pointer canonicalization. */
1680 && !(targetm.have_canonicalize_funcptr_for_compare ()
1681 && TREE_CODE (TREE_TYPE (@00)) == POINTER_TYPE
1682 && TREE_CODE (TREE_TYPE (TREE_TYPE (@00))) == FUNCTION_TYPE)
1684 (if (TYPE_PRECISION (TREE_TYPE (@00)) == TYPE_PRECISION (TREE_TYPE (@0))
1685 && (TREE_CODE (@10) == INTEGER_CST
1686 || (@1 != @10 && types_match (TREE_TYPE (@10), TREE_TYPE (@00))))
1687 && (TYPE_UNSIGNED (TREE_TYPE (@00)) == TYPE_UNSIGNED (TREE_TYPE (@0))
1690 && (POINTER_TYPE_P (TREE_TYPE (@00)) == POINTER_TYPE_P (TREE_TYPE (@0))))
1691 /* ??? The special-casing of INTEGER_CST conversion was in the original
1692 code and here to avoid a spurious overflow flag on the resulting
1693 constant which fold_convert produces. */
1694 (if (TREE_CODE (@1) == INTEGER_CST)
1695 (cmp @00 { force_fit_type (TREE_TYPE (@00), wi::to_widest (@1), 0,
1696 TREE_OVERFLOW (@1)); })
1697 (cmp @00 (convert @1)))
1699 (if (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (TREE_TYPE (@00)))
1700 /* If possible, express the comparison in the shorter mode. */
1701 (if ((cmp == EQ_EXPR || cmp == NE_EXPR
1702 || TYPE_UNSIGNED (TREE_TYPE (@0)) == TYPE_UNSIGNED (TREE_TYPE (@00)))
1703 && (types_match (TREE_TYPE (@10), TREE_TYPE (@00))
1704 || ((TYPE_PRECISION (TREE_TYPE (@00))
1705 >= TYPE_PRECISION (TREE_TYPE (@10)))
1706 && (TYPE_UNSIGNED (TREE_TYPE (@00))
1707 == TYPE_UNSIGNED (TREE_TYPE (@10))))
1708 || (TREE_CODE (@10) == INTEGER_CST
1709 && (TREE_CODE (TREE_TYPE (@00)) == INTEGER_TYPE
1710 || TREE_CODE (TREE_TYPE (@00)) == BOOLEAN_TYPE)
1711 && int_fits_type_p (@10, TREE_TYPE (@00)))))
1712 (cmp @00 (convert @10))
1713 (if (TREE_CODE (@10) == INTEGER_CST
1714 && TREE_CODE (TREE_TYPE (@00)) == INTEGER_TYPE
1715 && !int_fits_type_p (@10, TREE_TYPE (@00)))
1718 tree min = lower_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
1719 tree max = upper_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
1720 bool above = integer_nonzerop (const_binop (LT_EXPR, type, max, @10));
1721 bool below = integer_nonzerop (const_binop (LT_EXPR, type, @10, min));
1723 (if (above || below)
1724 (if (cmp == EQ_EXPR || cmp == NE_EXPR)
1725 { constant_boolean_node (cmp == EQ_EXPR ? false : true, type); }
1726 (if (cmp == LT_EXPR || cmp == LE_EXPR)
1727 { constant_boolean_node (above ? true : false, type); }
1728 (if (cmp == GT_EXPR || cmp == GE_EXPR)
1729 { constant_boolean_node (above ? false : true, type); }))))))))))))
1731 /* Equality compare simplifications from fold_binary */
1734 /* If we have (A | C) == D where C & ~D != 0, convert this into 0.
1735 Similarly for NE_EXPR. */
1737 (cmp (convert?@3 (bit_ior @0 INTEGER_CST@1)) INTEGER_CST@2)
1738 (if (tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0))
1739 && wi::bit_and_not (@1, @2) != 0)
1740 { constant_boolean_node (cmp == NE_EXPR, type); }))
1742 /* (X ^ Y) == 0 becomes X == Y, and (X ^ Y) != 0 becomes X != Y. */
1744 (cmp (bit_xor @0 @1) integer_zerop)
1747 /* (X ^ Y) == Y becomes X == 0.
1748 Likewise (X ^ Y) == X becomes Y == 0. */
1750 (cmp:c (bit_xor:c @0 @1) @0)
1751 (cmp @1 { build_zero_cst (TREE_TYPE (@1)); }))
1753 /* (X ^ C1) op C2 can be rewritten as X op (C1 ^ C2). */
1755 (cmp (convert?@3 (bit_xor @0 INTEGER_CST@1)) INTEGER_CST@2)
1756 (if (tree_nop_conversion_p (TREE_TYPE (@3), TREE_TYPE (@0)))
1757 (cmp @0 (bit_xor @1 (convert @2)))))
1759 /* If this is an equality comparison of the address of two non-weak,
1760 unaliased symbols neither of which are extern (since we do not
1761 have access to attributes for externs), then we know the result. */
1763 (cmp (convert? addr@0) (convert? addr@1))
1764 (if (decl_in_symtab_p (TREE_OPERAND (@0, 0))
1765 && decl_in_symtab_p (TREE_OPERAND (@1, 0)))
1768 int equal = symtab_node::get_create (TREE_OPERAND (@0, 0))
1769 ->equal_address_to (symtab_node::get_create (TREE_OPERAND (@1, 0)));
1772 { constant_boolean_node (equal ? cmp == EQ_EXPR : cmp != EQ_EXPR, type); }))))
1775 (cmp (convert? addr@0) integer_zerop)
1776 (if (tree_single_nonzero_warnv_p (@0, NULL))
1777 { constant_boolean_node (cmp == NE_EXPR, type); })))
1780 /* bool_var != 0 becomes bool_var. */
1782 (ne @0 integer_zerop@1)
1783 (if (TREE_CODE (TREE_TYPE (@0)) == BOOLEAN_TYPE
1784 && types_match (type, TREE_TYPE (@0)))
1786 /* bool_var == 1 becomes bool_var. */
1788 (eq @0 integer_onep@1)
1789 (if (TREE_CODE (TREE_TYPE (@0)) == BOOLEAN_TYPE
1790 && types_match (type, TREE_TYPE (@0)))
1794 /* Simplification of math builtins. */
1796 /* fold_builtin_logarithm */
1797 (if (flag_unsafe_math_optimizations)
1798 /* Special case, optimize logN(expN(x)) = x. */
1799 (for logs (LOG LOG2 LOG10)
1800 exps (EXP EXP2 EXP10)
1804 /* Optimize logN(func()) for various exponential functions. We
1805 want to determine the value "x" and the power "exponent" in
1806 order to transform logN(x**exponent) into exponent*logN(x). */
1807 (for logs (LOG LOG LOG LOG
1809 LOG10 LOG10 LOG10 LOG10)
1810 exps (EXP EXP2 EXP10 POW10)
1817 CASE_FLT_FN (BUILT_IN_EXP):
1818 /* Prepare to do logN(exp(exponent) -> exponent*logN(e). */
1819 x = build_real (type, real_value_truncate (TYPE_MODE (type),
1822 CASE_FLT_FN (BUILT_IN_EXP2):
1823 /* Prepare to do logN(exp2(exponent) -> exponent*logN(2). */
1824 x = build_real (type, dconst2);
1826 CASE_FLT_FN (BUILT_IN_EXP10):
1827 CASE_FLT_FN (BUILT_IN_POW10):
1828 /* Prepare to do logN(exp10(exponent) -> exponent*logN(10). */
1830 REAL_VALUE_TYPE dconst10;
1831 real_from_integer (&dconst10, VOIDmode, 10, SIGNED);
1832 x = build_real (type, dconst10);
1837 (mult (logs { x; }) @0))))
1848 CASE_FLT_FN (BUILT_IN_SQRT):
1849 /* Prepare to do logN(sqrt(x) -> 0.5*logN(x). */
1850 x = build_real (type, dconsthalf);
1852 CASE_FLT_FN (BUILT_IN_CBRT):
1853 /* Prepare to do logN(cbrt(x) -> (1/3)*logN(x). */
1854 x = build_real (type, real_value_truncate (TYPE_MODE (type),
1859 (mult { x; } (logs @0)))))
1860 /* logN(pow(x,exponent) -> exponent*logN(x). */
1861 (for logs (LOG LOG2 LOG10)
1865 (mult @1 (logs @0)))))
1867 /* Narrowing of arithmetic and logical operations.
1869 These are conceptually similar to the transformations performed for
1870 the C/C++ front-ends by shorten_binary_op and shorten_compare. Long
1871 term we want to move all that code out of the front-ends into here. */
1873 /* If we have a narrowing conversion of an arithmetic operation where
1874 both operands are widening conversions from the same type as the outer
1875 narrowing conversion. Then convert the innermost operands to a suitable
1876 unsigned type (to avoid introducing undefined behaviour), perform the
1877 operation and convert the result to the desired type. */
1878 (for op (plus minus)
1880 (convert (op:s (convert@2 @0) (convert@3 @1)))
1881 (if (INTEGRAL_TYPE_P (type)
1882 /* We check for type compatibility between @0 and @1 below,
1883 so there's no need to check that @1/@3 are integral types. */
1884 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
1885 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
1886 /* The precision of the type of each operand must match the
1887 precision of the mode of each operand, similarly for the
1889 && (TYPE_PRECISION (TREE_TYPE (@0))
1890 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (@0))))
1891 && (TYPE_PRECISION (TREE_TYPE (@1))
1892 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (@1))))
1893 && TYPE_PRECISION (type) == GET_MODE_PRECISION (TYPE_MODE (type))
1894 /* The inner conversion must be a widening conversion. */
1895 && TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (TREE_TYPE (@0))
1896 && types_match (@0, @1)
1897 && types_match (@0, type))
1898 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
1899 (convert (op @0 @1))
1900 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
1901 (convert (op (convert:utype @0) (convert:utype @1))))))))
1903 /* This is another case of narrowing, specifically when there's an outer
1904 BIT_AND_EXPR which masks off bits outside the type of the innermost
1905 operands. Like the previous case we have to convert the operands
1906 to unsigned types to avoid introducing undefined behaviour for the
1907 arithmetic operation. */
1908 (for op (minus plus)
1910 (bit_and (op:s (convert@2 @0) (convert@3 @1)) INTEGER_CST@4)
1911 (if (INTEGRAL_TYPE_P (type)
1912 /* We check for type compatibility between @0 and @1 below,
1913 so there's no need to check that @1/@3 are integral types. */
1914 && INTEGRAL_TYPE_P (TREE_TYPE (@0))
1915 && INTEGRAL_TYPE_P (TREE_TYPE (@2))
1916 /* The precision of the type of each operand must match the
1917 precision of the mode of each operand, similarly for the
1919 && (TYPE_PRECISION (TREE_TYPE (@0))
1920 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (@0))))
1921 && (TYPE_PRECISION (TREE_TYPE (@1))
1922 == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (@1))))
1923 && TYPE_PRECISION (type) == GET_MODE_PRECISION (TYPE_MODE (type))
1924 /* The inner conversion must be a widening conversion. */
1925 && TYPE_PRECISION (TREE_TYPE (@2)) > TYPE_PRECISION (TREE_TYPE (@0))
1926 && types_match (@0, @1)
1927 && (tree_int_cst_min_precision (@4, TYPE_SIGN (TREE_TYPE (@0)))
1928 <= TYPE_PRECISION (TREE_TYPE (@0)))
1929 && (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0))
1930 || tree_int_cst_sgn (@4) >= 0))
1931 (if (TYPE_OVERFLOW_WRAPS (TREE_TYPE (@0)))
1932 (with { tree ntype = TREE_TYPE (@0); }
1933 (convert (bit_and (op @0 @1) (convert:ntype @4))))
1934 (with { tree utype = unsigned_type_for (TREE_TYPE (@0)); }
1935 (convert (bit_and (op (convert:utype @0) (convert:utype @1))
1936 (convert:utype @4))))))))