1 /* Convert tree expression to rtl instructions, for GNU compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
4 2012 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "hard-reg-set.h"
34 #include "insn-config.h"
35 #include "insn-attr.h"
36 /* Include expr.h after insn-config.h so we get HAVE_conditional_move. */
43 #include "typeclass.h"
45 #include "langhooks.h"
48 #include "tree-iterator.h"
49 #include "tree-pass.h"
50 #include "tree-flow.h"
52 #include "common/common-target.h"
55 #include "diagnostic.h"
56 #include "ssaexpand.h"
57 #include "target-globals.h"
60 /* Decide whether a function's arguments should be processed
61 from first to last or from last to first.
63 They should if the stack and args grow in opposite directions, but
64 only if we have push insns. */
68 #ifndef PUSH_ARGS_REVERSED
69 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
70 #define PUSH_ARGS_REVERSED /* If it's last to first. */
76 #ifndef STACK_PUSH_CODE
77 #ifdef STACK_GROWS_DOWNWARD
78 #define STACK_PUSH_CODE PRE_DEC
80 #define STACK_PUSH_CODE PRE_INC
85 /* If this is nonzero, we do not bother generating VOLATILE
86 around volatile memory references, and we are willing to
87 output indirect addresses. If cse is to follow, we reject
88 indirect addresses so a useful potential cse is generated;
89 if it is used only once, instruction combination will produce
90 the same indirect address eventually. */
93 /* This structure is used by move_by_pieces to describe the move to
95 struct move_by_pieces_d
104 int explicit_inc_from
;
105 unsigned HOST_WIDE_INT len
;
106 HOST_WIDE_INT offset
;
110 /* This structure is used by store_by_pieces to describe the clear to
113 struct store_by_pieces_d
119 unsigned HOST_WIDE_INT len
;
120 HOST_WIDE_INT offset
;
121 rtx (*constfun
) (void *, HOST_WIDE_INT
, enum machine_mode
);
126 static void move_by_pieces_1 (rtx (*) (rtx
, ...), enum machine_mode
,
127 struct move_by_pieces_d
*);
128 static bool block_move_libcall_safe_for_call_parm (void);
129 static bool emit_block_move_via_movmem (rtx
, rtx
, rtx
, unsigned, unsigned, HOST_WIDE_INT
);
130 static tree
emit_block_move_libcall_fn (int);
131 static void emit_block_move_via_loop (rtx
, rtx
, rtx
, unsigned);
132 static rtx
clear_by_pieces_1 (void *, HOST_WIDE_INT
, enum machine_mode
);
133 static void clear_by_pieces (rtx
, unsigned HOST_WIDE_INT
, unsigned int);
134 static void store_by_pieces_1 (struct store_by_pieces_d
*, unsigned int);
135 static void store_by_pieces_2 (rtx (*) (rtx
, ...), enum machine_mode
,
136 struct store_by_pieces_d
*);
137 static tree
clear_storage_libcall_fn (int);
138 static rtx
compress_float_constant (rtx
, rtx
);
139 static rtx
get_subtarget (rtx
);
140 static void store_constructor_field (rtx
, unsigned HOST_WIDE_INT
,
141 HOST_WIDE_INT
, enum machine_mode
,
142 tree
, tree
, int, alias_set_type
);
143 static void store_constructor (tree
, rtx
, int, HOST_WIDE_INT
);
144 static rtx
store_field (rtx
, HOST_WIDE_INT
, HOST_WIDE_INT
,
145 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
,
147 tree
, tree
, alias_set_type
, bool);
149 static unsigned HOST_WIDE_INT
highest_pow2_factor_for_target (const_tree
, const_tree
);
151 static int is_aligning_offset (const_tree
, const_tree
);
152 static void expand_operands (tree
, tree
, rtx
, rtx
*, rtx
*,
153 enum expand_modifier
);
154 static rtx
reduce_to_bit_field_precision (rtx
, rtx
, tree
);
155 static rtx
do_store_flag (sepops
, rtx
, enum machine_mode
);
157 static void emit_single_push_insn (enum machine_mode
, rtx
, tree
);
159 static void do_tablejump (rtx
, enum machine_mode
, rtx
, rtx
, rtx
);
160 static rtx
const_vector_from_tree (tree
);
161 static void write_complex_part (rtx
, rtx
, bool);
163 /* This macro is used to determine whether move_by_pieces should be called
164 to perform a structure copy. */
165 #ifndef MOVE_BY_PIECES_P
166 #define MOVE_BY_PIECES_P(SIZE, ALIGN) \
167 (move_by_pieces_ninsns (SIZE, ALIGN, MOVE_MAX_PIECES + 1) \
168 < (unsigned int) MOVE_RATIO (optimize_insn_for_speed_p ()))
171 /* This macro is used to determine whether clear_by_pieces should be
172 called to clear storage. */
173 #ifndef CLEAR_BY_PIECES_P
174 #define CLEAR_BY_PIECES_P(SIZE, ALIGN) \
175 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
176 < (unsigned int) CLEAR_RATIO (optimize_insn_for_speed_p ()))
179 /* This macro is used to determine whether store_by_pieces should be
180 called to "memset" storage with byte values other than zero. */
181 #ifndef SET_BY_PIECES_P
182 #define SET_BY_PIECES_P(SIZE, ALIGN) \
183 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
184 < (unsigned int) SET_RATIO (optimize_insn_for_speed_p ()))
187 /* This macro is used to determine whether store_by_pieces should be
188 called to "memcpy" storage when the source is a constant string. */
189 #ifndef STORE_BY_PIECES_P
190 #define STORE_BY_PIECES_P(SIZE, ALIGN) \
191 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
192 < (unsigned int) MOVE_RATIO (optimize_insn_for_speed_p ()))
195 /* SLOW_UNALIGNED_ACCESS is nonzero if unaligned accesses are very slow. */
197 #ifndef SLOW_UNALIGNED_ACCESS
198 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) STRICT_ALIGNMENT
201 /* This is run to set up which modes can be used
202 directly in memory and to initialize the block move optab. It is run
203 at the beginning of compilation and when the target is reinitialized. */
206 init_expr_target (void)
209 enum machine_mode mode
;
214 /* Try indexing by frame ptr and try by stack ptr.
215 It is known that on the Convex the stack ptr isn't a valid index.
216 With luck, one or the other is valid on any machine. */
217 mem
= gen_rtx_MEM (VOIDmode
, stack_pointer_rtx
);
218 mem1
= gen_rtx_MEM (VOIDmode
, frame_pointer_rtx
);
220 /* A scratch register we can modify in-place below to avoid
221 useless RTL allocations. */
222 reg
= gen_rtx_REG (VOIDmode
, -1);
224 insn
= rtx_alloc (INSN
);
225 pat
= gen_rtx_SET (VOIDmode
, NULL_RTX
, NULL_RTX
);
226 PATTERN (insn
) = pat
;
228 for (mode
= VOIDmode
; (int) mode
< NUM_MACHINE_MODES
;
229 mode
= (enum machine_mode
) ((int) mode
+ 1))
233 direct_load
[(int) mode
] = direct_store
[(int) mode
] = 0;
234 PUT_MODE (mem
, mode
);
235 PUT_MODE (mem1
, mode
);
236 PUT_MODE (reg
, mode
);
238 /* See if there is some register that can be used in this mode and
239 directly loaded or stored from memory. */
241 if (mode
!= VOIDmode
&& mode
!= BLKmode
)
242 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
243 && (direct_load
[(int) mode
] == 0 || direct_store
[(int) mode
] == 0);
246 if (! HARD_REGNO_MODE_OK (regno
, mode
))
249 SET_REGNO (reg
, regno
);
252 SET_DEST (pat
) = reg
;
253 if (recog (pat
, insn
, &num_clobbers
) >= 0)
254 direct_load
[(int) mode
] = 1;
256 SET_SRC (pat
) = mem1
;
257 SET_DEST (pat
) = reg
;
258 if (recog (pat
, insn
, &num_clobbers
) >= 0)
259 direct_load
[(int) mode
] = 1;
262 SET_DEST (pat
) = mem
;
263 if (recog (pat
, insn
, &num_clobbers
) >= 0)
264 direct_store
[(int) mode
] = 1;
267 SET_DEST (pat
) = mem1
;
268 if (recog (pat
, insn
, &num_clobbers
) >= 0)
269 direct_store
[(int) mode
] = 1;
273 mem
= gen_rtx_MEM (VOIDmode
, gen_rtx_raw_REG (Pmode
, 10000));
275 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
276 mode
= GET_MODE_WIDER_MODE (mode
))
278 enum machine_mode srcmode
;
279 for (srcmode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); srcmode
!= mode
;
280 srcmode
= GET_MODE_WIDER_MODE (srcmode
))
284 ic
= can_extend_p (mode
, srcmode
, 0);
285 if (ic
== CODE_FOR_nothing
)
288 PUT_MODE (mem
, srcmode
);
290 if (insn_operand_matches (ic
, 1, mem
))
291 float_extend_from_mem
[mode
][srcmode
] = true;
296 /* This is run at the start of compiling a function. */
301 memset (&crtl
->expr
, 0, sizeof (crtl
->expr
));
304 /* Copy data from FROM to TO, where the machine modes are not the same.
305 Both modes may be integer, or both may be floating, or both may be
307 UNSIGNEDP should be nonzero if FROM is an unsigned type.
308 This causes zero-extension instead of sign-extension. */
311 convert_move (rtx to
, rtx from
, int unsignedp
)
313 enum machine_mode to_mode
= GET_MODE (to
);
314 enum machine_mode from_mode
= GET_MODE (from
);
315 int to_real
= SCALAR_FLOAT_MODE_P (to_mode
);
316 int from_real
= SCALAR_FLOAT_MODE_P (from_mode
);
320 /* rtx code for making an equivalent value. */
321 enum rtx_code equiv_code
= (unsignedp
< 0 ? UNKNOWN
322 : (unsignedp
? ZERO_EXTEND
: SIGN_EXTEND
));
325 gcc_assert (to_real
== from_real
);
326 gcc_assert (to_mode
!= BLKmode
);
327 gcc_assert (from_mode
!= BLKmode
);
329 /* If the source and destination are already the same, then there's
334 /* If FROM is a SUBREG that indicates that we have already done at least
335 the required extension, strip it. We don't handle such SUBREGs as
338 if (GET_CODE (from
) == SUBREG
&& SUBREG_PROMOTED_VAR_P (from
)
339 && (GET_MODE_PRECISION (GET_MODE (SUBREG_REG (from
)))
340 >= GET_MODE_PRECISION (to_mode
))
341 && SUBREG_PROMOTED_UNSIGNED_P (from
) == unsignedp
)
342 from
= gen_lowpart (to_mode
, from
), from_mode
= to_mode
;
344 gcc_assert (GET_CODE (to
) != SUBREG
|| !SUBREG_PROMOTED_VAR_P (to
));
346 if (to_mode
== from_mode
347 || (from_mode
== VOIDmode
&& CONSTANT_P (from
)))
349 emit_move_insn (to
, from
);
353 if (VECTOR_MODE_P (to_mode
) || VECTOR_MODE_P (from_mode
))
355 gcc_assert (GET_MODE_BITSIZE (from_mode
) == GET_MODE_BITSIZE (to_mode
));
357 if (VECTOR_MODE_P (to_mode
))
358 from
= simplify_gen_subreg (to_mode
, from
, GET_MODE (from
), 0);
360 to
= simplify_gen_subreg (from_mode
, to
, GET_MODE (to
), 0);
362 emit_move_insn (to
, from
);
366 if (GET_CODE (to
) == CONCAT
&& GET_CODE (from
) == CONCAT
)
368 convert_move (XEXP (to
, 0), XEXP (from
, 0), unsignedp
);
369 convert_move (XEXP (to
, 1), XEXP (from
, 1), unsignedp
);
378 gcc_assert ((GET_MODE_PRECISION (from_mode
)
379 != GET_MODE_PRECISION (to_mode
))
380 || (DECIMAL_FLOAT_MODE_P (from_mode
)
381 != DECIMAL_FLOAT_MODE_P (to_mode
)));
383 if (GET_MODE_PRECISION (from_mode
) == GET_MODE_PRECISION (to_mode
))
384 /* Conversion between decimal float and binary float, same size. */
385 tab
= DECIMAL_FLOAT_MODE_P (from_mode
) ? trunc_optab
: sext_optab
;
386 else if (GET_MODE_PRECISION (from_mode
) < GET_MODE_PRECISION (to_mode
))
391 /* Try converting directly if the insn is supported. */
393 code
= convert_optab_handler (tab
, to_mode
, from_mode
);
394 if (code
!= CODE_FOR_nothing
)
396 emit_unop_insn (code
, to
, from
,
397 tab
== sext_optab
? FLOAT_EXTEND
: FLOAT_TRUNCATE
);
401 /* Otherwise use a libcall. */
402 libcall
= convert_optab_libfunc (tab
, to_mode
, from_mode
);
404 /* Is this conversion implemented yet? */
405 gcc_assert (libcall
);
408 value
= emit_library_call_value (libcall
, NULL_RTX
, LCT_CONST
, to_mode
,
410 insns
= get_insns ();
412 emit_libcall_block (insns
, to
, value
,
413 tab
== trunc_optab
? gen_rtx_FLOAT_TRUNCATE (to_mode
,
415 : gen_rtx_FLOAT_EXTEND (to_mode
, from
));
419 /* Handle pointer conversion. */ /* SPEE 900220. */
420 /* Targets are expected to provide conversion insns between PxImode and
421 xImode for all MODE_PARTIAL_INT modes they use, but no others. */
422 if (GET_MODE_CLASS (to_mode
) == MODE_PARTIAL_INT
)
424 enum machine_mode full_mode
425 = smallest_mode_for_size (GET_MODE_BITSIZE (to_mode
), MODE_INT
);
427 gcc_assert (convert_optab_handler (trunc_optab
, to_mode
, full_mode
)
428 != CODE_FOR_nothing
);
430 if (full_mode
!= from_mode
)
431 from
= convert_to_mode (full_mode
, from
, unsignedp
);
432 emit_unop_insn (convert_optab_handler (trunc_optab
, to_mode
, full_mode
),
436 if (GET_MODE_CLASS (from_mode
) == MODE_PARTIAL_INT
)
439 enum machine_mode full_mode
440 = smallest_mode_for_size (GET_MODE_BITSIZE (from_mode
), MODE_INT
);
442 gcc_assert (convert_optab_handler (sext_optab
, full_mode
, from_mode
)
443 != CODE_FOR_nothing
);
445 if (to_mode
== full_mode
)
447 emit_unop_insn (convert_optab_handler (sext_optab
, full_mode
,
453 new_from
= gen_reg_rtx (full_mode
);
454 emit_unop_insn (convert_optab_handler (sext_optab
, full_mode
, from_mode
),
455 new_from
, from
, UNKNOWN
);
457 /* else proceed to integer conversions below. */
458 from_mode
= full_mode
;
462 /* Make sure both are fixed-point modes or both are not. */
463 gcc_assert (ALL_SCALAR_FIXED_POINT_MODE_P (from_mode
) ==
464 ALL_SCALAR_FIXED_POINT_MODE_P (to_mode
));
465 if (ALL_SCALAR_FIXED_POINT_MODE_P (from_mode
))
467 /* If we widen from_mode to to_mode and they are in the same class,
468 we won't saturate the result.
469 Otherwise, always saturate the result to play safe. */
470 if (GET_MODE_CLASS (from_mode
) == GET_MODE_CLASS (to_mode
)
471 && GET_MODE_SIZE (from_mode
) < GET_MODE_SIZE (to_mode
))
472 expand_fixed_convert (to
, from
, 0, 0);
474 expand_fixed_convert (to
, from
, 0, 1);
478 /* Now both modes are integers. */
480 /* Handle expanding beyond a word. */
481 if (GET_MODE_PRECISION (from_mode
) < GET_MODE_PRECISION (to_mode
)
482 && GET_MODE_PRECISION (to_mode
) > BITS_PER_WORD
)
489 enum machine_mode lowpart_mode
;
490 int nwords
= CEIL (GET_MODE_SIZE (to_mode
), UNITS_PER_WORD
);
492 /* Try converting directly if the insn is supported. */
493 if ((code
= can_extend_p (to_mode
, from_mode
, unsignedp
))
496 /* If FROM is a SUBREG, put it into a register. Do this
497 so that we always generate the same set of insns for
498 better cse'ing; if an intermediate assignment occurred,
499 we won't be doing the operation directly on the SUBREG. */
500 if (optimize
> 0 && GET_CODE (from
) == SUBREG
)
501 from
= force_reg (from_mode
, from
);
502 emit_unop_insn (code
, to
, from
, equiv_code
);
505 /* Next, try converting via full word. */
506 else if (GET_MODE_PRECISION (from_mode
) < BITS_PER_WORD
507 && ((code
= can_extend_p (to_mode
, word_mode
, unsignedp
))
508 != CODE_FOR_nothing
))
510 rtx word_to
= gen_reg_rtx (word_mode
);
513 if (reg_overlap_mentioned_p (to
, from
))
514 from
= force_reg (from_mode
, from
);
517 convert_move (word_to
, from
, unsignedp
);
518 emit_unop_insn (code
, to
, word_to
, equiv_code
);
522 /* No special multiword conversion insn; do it by hand. */
525 /* Since we will turn this into a no conflict block, we must ensure
526 that the source does not overlap the target. */
528 if (reg_overlap_mentioned_p (to
, from
))
529 from
= force_reg (from_mode
, from
);
531 /* Get a copy of FROM widened to a word, if necessary. */
532 if (GET_MODE_PRECISION (from_mode
) < BITS_PER_WORD
)
533 lowpart_mode
= word_mode
;
535 lowpart_mode
= from_mode
;
537 lowfrom
= convert_to_mode (lowpart_mode
, from
, unsignedp
);
539 lowpart
= gen_lowpart (lowpart_mode
, to
);
540 emit_move_insn (lowpart
, lowfrom
);
542 /* Compute the value to put in each remaining word. */
544 fill_value
= const0_rtx
;
546 fill_value
= emit_store_flag (gen_reg_rtx (word_mode
),
547 LT
, lowfrom
, const0_rtx
,
550 /* Fill the remaining words. */
551 for (i
= GET_MODE_SIZE (lowpart_mode
) / UNITS_PER_WORD
; i
< nwords
; i
++)
553 int index
= (WORDS_BIG_ENDIAN
? nwords
- i
- 1 : i
);
554 rtx subword
= operand_subword (to
, index
, 1, to_mode
);
556 gcc_assert (subword
);
558 if (fill_value
!= subword
)
559 emit_move_insn (subword
, fill_value
);
562 insns
= get_insns ();
569 /* Truncating multi-word to a word or less. */
570 if (GET_MODE_PRECISION (from_mode
) > BITS_PER_WORD
571 && GET_MODE_PRECISION (to_mode
) <= BITS_PER_WORD
)
574 && ! MEM_VOLATILE_P (from
)
575 && direct_load
[(int) to_mode
]
576 && ! mode_dependent_address_p (XEXP (from
, 0)))
578 || GET_CODE (from
) == SUBREG
))
579 from
= force_reg (from_mode
, from
);
580 convert_move (to
, gen_lowpart (word_mode
, from
), 0);
584 /* Now follow all the conversions between integers
585 no more than a word long. */
587 /* For truncation, usually we can just refer to FROM in a narrower mode. */
588 if (GET_MODE_BITSIZE (to_mode
) < GET_MODE_BITSIZE (from_mode
)
589 && TRULY_NOOP_TRUNCATION_MODES_P (to_mode
, from_mode
))
592 && ! MEM_VOLATILE_P (from
)
593 && direct_load
[(int) to_mode
]
594 && ! mode_dependent_address_p (XEXP (from
, 0)))
596 || GET_CODE (from
) == SUBREG
))
597 from
= force_reg (from_mode
, from
);
598 if (REG_P (from
) && REGNO (from
) < FIRST_PSEUDO_REGISTER
599 && ! HARD_REGNO_MODE_OK (REGNO (from
), to_mode
))
600 from
= copy_to_reg (from
);
601 emit_move_insn (to
, gen_lowpart (to_mode
, from
));
605 /* Handle extension. */
606 if (GET_MODE_PRECISION (to_mode
) > GET_MODE_PRECISION (from_mode
))
608 /* Convert directly if that works. */
609 if ((code
= can_extend_p (to_mode
, from_mode
, unsignedp
))
612 emit_unop_insn (code
, to
, from
, equiv_code
);
617 enum machine_mode intermediate
;
621 /* Search for a mode to convert via. */
622 for (intermediate
= from_mode
; intermediate
!= VOIDmode
;
623 intermediate
= GET_MODE_WIDER_MODE (intermediate
))
624 if (((can_extend_p (to_mode
, intermediate
, unsignedp
)
626 || (GET_MODE_SIZE (to_mode
) < GET_MODE_SIZE (intermediate
)
627 && TRULY_NOOP_TRUNCATION_MODES_P (to_mode
, intermediate
)))
628 && (can_extend_p (intermediate
, from_mode
, unsignedp
)
629 != CODE_FOR_nothing
))
631 convert_move (to
, convert_to_mode (intermediate
, from
,
632 unsignedp
), unsignedp
);
636 /* No suitable intermediate mode.
637 Generate what we need with shifts. */
638 shift_amount
= (GET_MODE_PRECISION (to_mode
)
639 - GET_MODE_PRECISION (from_mode
));
640 from
= gen_lowpart (to_mode
, force_reg (from_mode
, from
));
641 tmp
= expand_shift (LSHIFT_EXPR
, to_mode
, from
, shift_amount
,
643 tmp
= expand_shift (RSHIFT_EXPR
, to_mode
, tmp
, shift_amount
,
646 emit_move_insn (to
, tmp
);
651 /* Support special truncate insns for certain modes. */
652 if (convert_optab_handler (trunc_optab
, to_mode
,
653 from_mode
) != CODE_FOR_nothing
)
655 emit_unop_insn (convert_optab_handler (trunc_optab
, to_mode
, from_mode
),
660 /* Handle truncation of volatile memrefs, and so on;
661 the things that couldn't be truncated directly,
662 and for which there was no special instruction.
664 ??? Code above formerly short-circuited this, for most integer
665 mode pairs, with a force_reg in from_mode followed by a recursive
666 call to this routine. Appears always to have been wrong. */
667 if (GET_MODE_PRECISION (to_mode
) < GET_MODE_PRECISION (from_mode
))
669 rtx temp
= force_reg (to_mode
, gen_lowpart (to_mode
, from
));
670 emit_move_insn (to
, temp
);
674 /* Mode combination is not recognized. */
678 /* Return an rtx for a value that would result
679 from converting X to mode MODE.
680 Both X and MODE may be floating, or both integer.
681 UNSIGNEDP is nonzero if X is an unsigned value.
682 This can be done by referring to a part of X in place
683 or by copying to a new temporary with conversion. */
686 convert_to_mode (enum machine_mode mode
, rtx x
, int unsignedp
)
688 return convert_modes (mode
, VOIDmode
, x
, unsignedp
);
691 /* Return an rtx for a value that would result
692 from converting X from mode OLDMODE to mode MODE.
693 Both modes may be floating, or both integer.
694 UNSIGNEDP is nonzero if X is an unsigned value.
696 This can be done by referring to a part of X in place
697 or by copying to a new temporary with conversion.
699 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode. */
702 convert_modes (enum machine_mode mode
, enum machine_mode oldmode
, rtx x
, int unsignedp
)
706 /* If FROM is a SUBREG that indicates that we have already done at least
707 the required extension, strip it. */
709 if (GET_CODE (x
) == SUBREG
&& SUBREG_PROMOTED_VAR_P (x
)
710 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x
))) >= GET_MODE_SIZE (mode
)
711 && SUBREG_PROMOTED_UNSIGNED_P (x
) == unsignedp
)
712 x
= gen_lowpart (mode
, x
);
714 if (GET_MODE (x
) != VOIDmode
)
715 oldmode
= GET_MODE (x
);
720 /* There is one case that we must handle specially: If we are converting
721 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
722 we are to interpret the constant as unsigned, gen_lowpart will do
723 the wrong if the constant appears negative. What we want to do is
724 make the high-order word of the constant zero, not all ones. */
726 if (unsignedp
&& GET_MODE_CLASS (mode
) == MODE_INT
727 && GET_MODE_BITSIZE (mode
) == 2 * HOST_BITS_PER_WIDE_INT
728 && CONST_INT_P (x
) && INTVAL (x
) < 0)
730 double_int val
= uhwi_to_double_int (INTVAL (x
));
732 /* We need to zero extend VAL. */
733 if (oldmode
!= VOIDmode
)
734 val
= double_int_zext (val
, GET_MODE_BITSIZE (oldmode
));
736 return immed_double_int_const (val
, mode
);
739 /* We can do this with a gen_lowpart if both desired and current modes
740 are integer, and this is either a constant integer, a register, or a
741 non-volatile MEM. Except for the constant case where MODE is no
742 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
745 && GET_MODE_PRECISION (mode
) <= HOST_BITS_PER_WIDE_INT
)
746 || (GET_MODE_CLASS (mode
) == MODE_INT
747 && GET_MODE_CLASS (oldmode
) == MODE_INT
748 && (GET_CODE (x
) == CONST_DOUBLE
749 || (GET_MODE_PRECISION (mode
) <= GET_MODE_PRECISION (oldmode
)
750 && ((MEM_P (x
) && ! MEM_VOLATILE_P (x
)
751 && direct_load
[(int) mode
])
753 && (! HARD_REGISTER_P (x
)
754 || HARD_REGNO_MODE_OK (REGNO (x
), mode
))
755 && TRULY_NOOP_TRUNCATION_MODES_P (mode
,
758 /* ?? If we don't know OLDMODE, we have to assume here that
759 X does not need sign- or zero-extension. This may not be
760 the case, but it's the best we can do. */
761 if (CONST_INT_P (x
) && oldmode
!= VOIDmode
762 && GET_MODE_PRECISION (mode
) > GET_MODE_PRECISION (oldmode
))
764 HOST_WIDE_INT val
= INTVAL (x
);
766 /* We must sign or zero-extend in this case. Start by
767 zero-extending, then sign extend if we need to. */
768 val
&= GET_MODE_MASK (oldmode
);
770 && val_signbit_known_set_p (oldmode
, val
))
771 val
|= ~GET_MODE_MASK (oldmode
);
773 return gen_int_mode (val
, mode
);
776 return gen_lowpart (mode
, x
);
779 /* Converting from integer constant into mode is always equivalent to an
781 if (VECTOR_MODE_P (mode
) && GET_MODE (x
) == VOIDmode
)
783 gcc_assert (GET_MODE_BITSIZE (mode
) == GET_MODE_BITSIZE (oldmode
));
784 return simplify_gen_subreg (mode
, x
, oldmode
, 0);
787 temp
= gen_reg_rtx (mode
);
788 convert_move (temp
, x
, unsignedp
);
792 /* Return the largest alignment we can use for doing a move (or store)
793 of MAX_PIECES. ALIGN is the largest alignment we could use. */
796 alignment_for_piecewise_move (unsigned int max_pieces
, unsigned int align
)
798 enum machine_mode tmode
;
800 tmode
= mode_for_size (max_pieces
* BITS_PER_UNIT
, MODE_INT
, 1);
801 if (align
>= GET_MODE_ALIGNMENT (tmode
))
802 align
= GET_MODE_ALIGNMENT (tmode
);
805 enum machine_mode tmode
, xmode
;
807 for (tmode
= GET_CLASS_NARROWEST_MODE (MODE_INT
), xmode
= tmode
;
809 xmode
= tmode
, tmode
= GET_MODE_WIDER_MODE (tmode
))
810 if (GET_MODE_SIZE (tmode
) > max_pieces
811 || SLOW_UNALIGNED_ACCESS (tmode
, align
))
814 align
= MAX (align
, GET_MODE_ALIGNMENT (xmode
));
820 /* Return the widest integer mode no wider than SIZE. If no such mode
821 can be found, return VOIDmode. */
823 static enum machine_mode
824 widest_int_mode_for_size (unsigned int size
)
826 enum machine_mode tmode
, mode
= VOIDmode
;
828 for (tmode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
829 tmode
!= VOIDmode
; tmode
= GET_MODE_WIDER_MODE (tmode
))
830 if (GET_MODE_SIZE (tmode
) < size
)
836 /* STORE_MAX_PIECES is the number of bytes at a time that we can
837 store efficiently. Due to internal GCC limitations, this is
838 MOVE_MAX_PIECES limited by the number of bytes GCC can represent
839 for an immediate constant. */
841 #define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
843 /* Determine whether the LEN bytes can be moved by using several move
844 instructions. Return nonzero if a call to move_by_pieces should
848 can_move_by_pieces (unsigned HOST_WIDE_INT len
,
849 unsigned int align ATTRIBUTE_UNUSED
)
851 return MOVE_BY_PIECES_P (len
, align
);
854 /* Generate several move instructions to copy LEN bytes from block FROM to
855 block TO. (These are MEM rtx's with BLKmode).
857 If PUSH_ROUNDING is defined and TO is NULL, emit_single_push_insn is
858 used to push FROM to the stack.
860 ALIGN is maximum stack alignment we can assume.
862 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
863 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
867 move_by_pieces (rtx to
, rtx from
, unsigned HOST_WIDE_INT len
,
868 unsigned int align
, int endp
)
870 struct move_by_pieces_d data
;
871 enum machine_mode to_addr_mode
, from_addr_mode
872 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (from
));
873 rtx to_addr
, from_addr
= XEXP (from
, 0);
874 unsigned int max_size
= MOVE_MAX_PIECES
+ 1;
875 enum insn_code icode
;
877 align
= MIN (to
? MEM_ALIGN (to
) : align
, MEM_ALIGN (from
));
880 data
.from_addr
= from_addr
;
883 to_addr_mode
= targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (to
));
884 to_addr
= XEXP (to
, 0);
887 = (GET_CODE (to_addr
) == PRE_INC
|| GET_CODE (to_addr
) == PRE_DEC
888 || GET_CODE (to_addr
) == POST_INC
|| GET_CODE (to_addr
) == POST_DEC
);
890 = (GET_CODE (to_addr
) == PRE_DEC
|| GET_CODE (to_addr
) == POST_DEC
);
894 to_addr_mode
= VOIDmode
;
898 #ifdef STACK_GROWS_DOWNWARD
904 data
.to_addr
= to_addr
;
907 = (GET_CODE (from_addr
) == PRE_INC
|| GET_CODE (from_addr
) == PRE_DEC
908 || GET_CODE (from_addr
) == POST_INC
909 || GET_CODE (from_addr
) == POST_DEC
);
911 data
.explicit_inc_from
= 0;
912 data
.explicit_inc_to
= 0;
913 if (data
.reverse
) data
.offset
= len
;
916 /* If copying requires more than two move insns,
917 copy addresses to registers (to make displacements shorter)
918 and use post-increment if available. */
919 if (!(data
.autinc_from
&& data
.autinc_to
)
920 && move_by_pieces_ninsns (len
, align
, max_size
) > 2)
922 /* Find the mode of the largest move...
923 MODE might not be used depending on the definitions of the
924 USE_* macros below. */
925 enum machine_mode mode ATTRIBUTE_UNUSED
926 = widest_int_mode_for_size (max_size
);
928 if (USE_LOAD_PRE_DECREMENT (mode
) && data
.reverse
&& ! data
.autinc_from
)
930 data
.from_addr
= copy_to_mode_reg (from_addr_mode
,
931 plus_constant (from_addr
, len
));
932 data
.autinc_from
= 1;
933 data
.explicit_inc_from
= -1;
935 if (USE_LOAD_POST_INCREMENT (mode
) && ! data
.autinc_from
)
937 data
.from_addr
= copy_to_mode_reg (from_addr_mode
, from_addr
);
938 data
.autinc_from
= 1;
939 data
.explicit_inc_from
= 1;
941 if (!data
.autinc_from
&& CONSTANT_P (from_addr
))
942 data
.from_addr
= copy_to_mode_reg (from_addr_mode
, from_addr
);
943 if (USE_STORE_PRE_DECREMENT (mode
) && data
.reverse
&& ! data
.autinc_to
)
945 data
.to_addr
= copy_to_mode_reg (to_addr_mode
,
946 plus_constant (to_addr
, len
));
948 data
.explicit_inc_to
= -1;
950 if (USE_STORE_POST_INCREMENT (mode
) && ! data
.reverse
&& ! data
.autinc_to
)
952 data
.to_addr
= copy_to_mode_reg (to_addr_mode
, to_addr
);
954 data
.explicit_inc_to
= 1;
956 if (!data
.autinc_to
&& CONSTANT_P (to_addr
))
957 data
.to_addr
= copy_to_mode_reg (to_addr_mode
, to_addr
);
960 align
= alignment_for_piecewise_move (MOVE_MAX_PIECES
, align
);
962 /* First move what we can in the largest integer mode, then go to
963 successively smaller modes. */
967 enum machine_mode mode
= widest_int_mode_for_size (max_size
);
969 if (mode
== VOIDmode
)
972 icode
= optab_handler (mov_optab
, mode
);
973 if (icode
!= CODE_FOR_nothing
&& align
>= GET_MODE_ALIGNMENT (mode
))
974 move_by_pieces_1 (GEN_FCN (icode
), mode
, &data
);
976 max_size
= GET_MODE_SIZE (mode
);
979 /* The code above should have handled everything. */
980 gcc_assert (!data
.len
);
986 gcc_assert (!data
.reverse
);
991 if (HAVE_POST_INCREMENT
&& data
.explicit_inc_to
> 0)
992 emit_insn (gen_add2_insn (data
.to_addr
, constm1_rtx
));
994 data
.to_addr
= copy_to_mode_reg (to_addr_mode
,
995 plus_constant (data
.to_addr
,
998 to1
= adjust_automodify_address (data
.to
, QImode
, data
.to_addr
,
1005 to1
= adjust_address (data
.to
, QImode
, data
.offset
);
1013 /* Return number of insns required to move L bytes by pieces.
1014 ALIGN (in bits) is maximum alignment we can assume. */
1016 unsigned HOST_WIDE_INT
1017 move_by_pieces_ninsns (unsigned HOST_WIDE_INT l
, unsigned int align
,
1018 unsigned int max_size
)
1020 unsigned HOST_WIDE_INT n_insns
= 0;
1022 align
= alignment_for_piecewise_move (MOVE_MAX_PIECES
, align
);
1024 while (max_size
> 1)
1026 enum machine_mode mode
;
1027 enum insn_code icode
;
1029 mode
= widest_int_mode_for_size (max_size
);
1031 if (mode
== VOIDmode
)
1034 icode
= optab_handler (mov_optab
, mode
);
1035 if (icode
!= CODE_FOR_nothing
&& align
>= GET_MODE_ALIGNMENT (mode
))
1036 n_insns
+= l
/ GET_MODE_SIZE (mode
), l
%= GET_MODE_SIZE (mode
);
1038 max_size
= GET_MODE_SIZE (mode
);
1045 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1046 with move instructions for mode MODE. GENFUN is the gen_... function
1047 to make a move insn for that mode. DATA has all the other info. */
1050 move_by_pieces_1 (rtx (*genfun
) (rtx
, ...), enum machine_mode mode
,
1051 struct move_by_pieces_d
*data
)
1053 unsigned int size
= GET_MODE_SIZE (mode
);
1054 rtx to1
= NULL_RTX
, from1
;
1056 while (data
->len
>= size
)
1059 data
->offset
-= size
;
1063 if (data
->autinc_to
)
1064 to1
= adjust_automodify_address (data
->to
, mode
, data
->to_addr
,
1067 to1
= adjust_address (data
->to
, mode
, data
->offset
);
1070 if (data
->autinc_from
)
1071 from1
= adjust_automodify_address (data
->from
, mode
, data
->from_addr
,
1074 from1
= adjust_address (data
->from
, mode
, data
->offset
);
1076 if (HAVE_PRE_DECREMENT
&& data
->explicit_inc_to
< 0)
1077 emit_insn (gen_add2_insn (data
->to_addr
,
1078 GEN_INT (-(HOST_WIDE_INT
)size
)));
1079 if (HAVE_PRE_DECREMENT
&& data
->explicit_inc_from
< 0)
1080 emit_insn (gen_add2_insn (data
->from_addr
,
1081 GEN_INT (-(HOST_WIDE_INT
)size
)));
1084 emit_insn ((*genfun
) (to1
, from1
));
1087 #ifdef PUSH_ROUNDING
1088 emit_single_push_insn (mode
, from1
, NULL
);
1094 if (HAVE_POST_INCREMENT
&& data
->explicit_inc_to
> 0)
1095 emit_insn (gen_add2_insn (data
->to_addr
, GEN_INT (size
)));
1096 if (HAVE_POST_INCREMENT
&& data
->explicit_inc_from
> 0)
1097 emit_insn (gen_add2_insn (data
->from_addr
, GEN_INT (size
)));
1099 if (! data
->reverse
)
1100 data
->offset
+= size
;
1106 /* Emit code to move a block Y to a block X. This may be done with
1107 string-move instructions, with multiple scalar move instructions,
1108 or with a library call.
1110 Both X and Y must be MEM rtx's (perhaps inside VOLATILE) with mode BLKmode.
1111 SIZE is an rtx that says how long they are.
1112 ALIGN is the maximum alignment we can assume they have.
1113 METHOD describes what kind of copy this is, and what mechanisms may be used.
1115 Return the address of the new block, if memcpy is called and returns it,
1119 emit_block_move_hints (rtx x
, rtx y
, rtx size
, enum block_op_methods method
,
1120 unsigned int expected_align
, HOST_WIDE_INT expected_size
)
1127 if (CONST_INT_P (size
)
1128 && INTVAL (size
) == 0)
1133 case BLOCK_OP_NORMAL
:
1134 case BLOCK_OP_TAILCALL
:
1135 may_use_call
= true;
1138 case BLOCK_OP_CALL_PARM
:
1139 may_use_call
= block_move_libcall_safe_for_call_parm ();
1141 /* Make inhibit_defer_pop nonzero around the library call
1142 to force it to pop the arguments right away. */
1146 case BLOCK_OP_NO_LIBCALL
:
1147 may_use_call
= false;
1154 gcc_assert (MEM_P (x
) && MEM_P (y
));
1155 align
= MIN (MEM_ALIGN (x
), MEM_ALIGN (y
));
1156 gcc_assert (align
>= BITS_PER_UNIT
);
1158 /* Make sure we've got BLKmode addresses; store_one_arg can decide that
1159 block copy is more efficient for other large modes, e.g. DCmode. */
1160 x
= adjust_address (x
, BLKmode
, 0);
1161 y
= adjust_address (y
, BLKmode
, 0);
1163 /* Set MEM_SIZE as appropriate for this block copy. The main place this
1164 can be incorrect is coming from __builtin_memcpy. */
1165 if (CONST_INT_P (size
))
1167 x
= shallow_copy_rtx (x
);
1168 y
= shallow_copy_rtx (y
);
1169 set_mem_size (x
, INTVAL (size
));
1170 set_mem_size (y
, INTVAL (size
));
1173 if (CONST_INT_P (size
) && MOVE_BY_PIECES_P (INTVAL (size
), align
))
1174 move_by_pieces (x
, y
, INTVAL (size
), align
, 0);
1175 else if (emit_block_move_via_movmem (x
, y
, size
, align
,
1176 expected_align
, expected_size
))
1178 else if (may_use_call
1179 && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (x
))
1180 && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (y
)))
1182 /* Since x and y are passed to a libcall, mark the corresponding
1183 tree EXPR as addressable. */
1184 tree y_expr
= MEM_EXPR (y
);
1185 tree x_expr
= MEM_EXPR (x
);
1187 mark_addressable (y_expr
);
1189 mark_addressable (x_expr
);
1190 retval
= emit_block_move_via_libcall (x
, y
, size
,
1191 method
== BLOCK_OP_TAILCALL
);
1195 emit_block_move_via_loop (x
, y
, size
, align
);
1197 if (method
== BLOCK_OP_CALL_PARM
)
1204 emit_block_move (rtx x
, rtx y
, rtx size
, enum block_op_methods method
)
1206 return emit_block_move_hints (x
, y
, size
, method
, 0, -1);
1209 /* A subroutine of emit_block_move. Returns true if calling the
1210 block move libcall will not clobber any parameters which may have
1211 already been placed on the stack. */
1214 block_move_libcall_safe_for_call_parm (void)
1216 #if defined (REG_PARM_STACK_SPACE)
1220 /* If arguments are pushed on the stack, then they're safe. */
1224 /* If registers go on the stack anyway, any argument is sure to clobber
1225 an outgoing argument. */
1226 #if defined (REG_PARM_STACK_SPACE)
1227 fn
= emit_block_move_libcall_fn (false);
1228 /* Avoid set but not used warning if *REG_PARM_STACK_SPACE doesn't
1229 depend on its argument. */
1231 if (OUTGOING_REG_PARM_STACK_SPACE ((!fn
? NULL_TREE
: TREE_TYPE (fn
)))
1232 && REG_PARM_STACK_SPACE (fn
) != 0)
1236 /* If any argument goes in memory, then it might clobber an outgoing
1239 CUMULATIVE_ARGS args_so_far_v
;
1240 cumulative_args_t args_so_far
;
1243 fn
= emit_block_move_libcall_fn (false);
1244 INIT_CUMULATIVE_ARGS (args_so_far_v
, TREE_TYPE (fn
), NULL_RTX
, 0, 3);
1245 args_so_far
= pack_cumulative_args (&args_so_far_v
);
1247 arg
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
1248 for ( ; arg
!= void_list_node
; arg
= TREE_CHAIN (arg
))
1250 enum machine_mode mode
= TYPE_MODE (TREE_VALUE (arg
));
1251 rtx tmp
= targetm
.calls
.function_arg (args_so_far
, mode
,
1253 if (!tmp
|| !REG_P (tmp
))
1255 if (targetm
.calls
.arg_partial_bytes (args_so_far
, mode
, NULL
, 1))
1257 targetm
.calls
.function_arg_advance (args_so_far
, mode
,
1264 /* A subroutine of emit_block_move. Expand a movmem pattern;
1265 return true if successful. */
1268 emit_block_move_via_movmem (rtx x
, rtx y
, rtx size
, unsigned int align
,
1269 unsigned int expected_align
, HOST_WIDE_INT expected_size
)
1271 int save_volatile_ok
= volatile_ok
;
1272 enum machine_mode mode
;
1274 if (expected_align
< align
)
1275 expected_align
= align
;
1277 /* Since this is a move insn, we don't care about volatility. */
1280 /* Try the most limited insn first, because there's no point
1281 including more than one in the machine description unless
1282 the more limited one has some advantage. */
1284 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
); mode
!= VOIDmode
;
1285 mode
= GET_MODE_WIDER_MODE (mode
))
1287 enum insn_code code
= direct_optab_handler (movmem_optab
, mode
);
1289 if (code
!= CODE_FOR_nothing
1290 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1291 here because if SIZE is less than the mode mask, as it is
1292 returned by the macro, it will definitely be less than the
1293 actual mode mask. */
1294 && ((CONST_INT_P (size
)
1295 && ((unsigned HOST_WIDE_INT
) INTVAL (size
)
1296 <= (GET_MODE_MASK (mode
) >> 1)))
1297 || GET_MODE_BITSIZE (mode
) >= BITS_PER_WORD
))
1299 struct expand_operand ops
[6];
1302 /* ??? When called via emit_block_move_for_call, it'd be
1303 nice if there were some way to inform the backend, so
1304 that it doesn't fail the expansion because it thinks
1305 emitting the libcall would be more efficient. */
1306 nops
= insn_data
[(int) code
].n_generator_args
;
1307 gcc_assert (nops
== 4 || nops
== 6);
1309 create_fixed_operand (&ops
[0], x
);
1310 create_fixed_operand (&ops
[1], y
);
1311 /* The check above guarantees that this size conversion is valid. */
1312 create_convert_operand_to (&ops
[2], size
, mode
, true);
1313 create_integer_operand (&ops
[3], align
/ BITS_PER_UNIT
);
1316 create_integer_operand (&ops
[4], expected_align
/ BITS_PER_UNIT
);
1317 create_integer_operand (&ops
[5], expected_size
);
1319 if (maybe_expand_insn (code
, nops
, ops
))
1321 volatile_ok
= save_volatile_ok
;
1327 volatile_ok
= save_volatile_ok
;
1331 /* A subroutine of emit_block_move. Expand a call to memcpy.
1332 Return the return value from memcpy, 0 otherwise. */
1335 emit_block_move_via_libcall (rtx dst
, rtx src
, rtx size
, bool tailcall
)
1337 rtx dst_addr
, src_addr
;
1338 tree call_expr
, fn
, src_tree
, dst_tree
, size_tree
;
1339 enum machine_mode size_mode
;
1342 /* Emit code to copy the addresses of DST and SRC and SIZE into new
1343 pseudos. We can then place those new pseudos into a VAR_DECL and
1346 dst_addr
= copy_to_mode_reg (Pmode
, XEXP (dst
, 0));
1347 src_addr
= copy_to_mode_reg (Pmode
, XEXP (src
, 0));
1349 dst_addr
= convert_memory_address (ptr_mode
, dst_addr
);
1350 src_addr
= convert_memory_address (ptr_mode
, src_addr
);
1352 dst_tree
= make_tree (ptr_type_node
, dst_addr
);
1353 src_tree
= make_tree (ptr_type_node
, src_addr
);
1355 size_mode
= TYPE_MODE (sizetype
);
1357 size
= convert_to_mode (size_mode
, size
, 1);
1358 size
= copy_to_mode_reg (size_mode
, size
);
1360 /* It is incorrect to use the libcall calling conventions to call
1361 memcpy in this context. This could be a user call to memcpy and
1362 the user may wish to examine the return value from memcpy. For
1363 targets where libcalls and normal calls have different conventions
1364 for returning pointers, we could end up generating incorrect code. */
1366 size_tree
= make_tree (sizetype
, size
);
1368 fn
= emit_block_move_libcall_fn (true);
1369 call_expr
= build_call_expr (fn
, 3, dst_tree
, src_tree
, size_tree
);
1370 CALL_EXPR_TAILCALL (call_expr
) = tailcall
;
1372 retval
= expand_normal (call_expr
);
1377 /* A subroutine of emit_block_move_via_libcall. Create the tree node
1378 for the function we use for block copies. The first time FOR_CALL
1379 is true, we call assemble_external. */
1381 static GTY(()) tree block_move_fn
;
1384 init_block_move_fn (const char *asmspec
)
1390 fn
= get_identifier ("memcpy");
1391 args
= build_function_type_list (ptr_type_node
, ptr_type_node
,
1392 const_ptr_type_node
, sizetype
,
1395 fn
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
, fn
, args
);
1396 DECL_EXTERNAL (fn
) = 1;
1397 TREE_PUBLIC (fn
) = 1;
1398 DECL_ARTIFICIAL (fn
) = 1;
1399 TREE_NOTHROW (fn
) = 1;
1400 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
1401 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
1407 set_user_assembler_name (block_move_fn
, asmspec
);
1411 emit_block_move_libcall_fn (int for_call
)
1413 static bool emitted_extern
;
1416 init_block_move_fn (NULL
);
1418 if (for_call
&& !emitted_extern
)
1420 emitted_extern
= true;
1421 make_decl_rtl (block_move_fn
);
1422 assemble_external (block_move_fn
);
1425 return block_move_fn
;
1428 /* A subroutine of emit_block_move. Copy the data via an explicit
1429 loop. This is used only when libcalls are forbidden. */
1430 /* ??? It'd be nice to copy in hunks larger than QImode. */
1433 emit_block_move_via_loop (rtx x
, rtx y
, rtx size
,
1434 unsigned int align ATTRIBUTE_UNUSED
)
1436 rtx cmp_label
, top_label
, iter
, x_addr
, y_addr
, tmp
;
1437 enum machine_mode x_addr_mode
1438 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (x
));
1439 enum machine_mode y_addr_mode
1440 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (y
));
1441 enum machine_mode iter_mode
;
1443 iter_mode
= GET_MODE (size
);
1444 if (iter_mode
== VOIDmode
)
1445 iter_mode
= word_mode
;
1447 top_label
= gen_label_rtx ();
1448 cmp_label
= gen_label_rtx ();
1449 iter
= gen_reg_rtx (iter_mode
);
1451 emit_move_insn (iter
, const0_rtx
);
1453 x_addr
= force_operand (XEXP (x
, 0), NULL_RTX
);
1454 y_addr
= force_operand (XEXP (y
, 0), NULL_RTX
);
1455 do_pending_stack_adjust ();
1457 emit_jump (cmp_label
);
1458 emit_label (top_label
);
1460 tmp
= convert_modes (x_addr_mode
, iter_mode
, iter
, true);
1461 x_addr
= gen_rtx_PLUS (x_addr_mode
, x_addr
, tmp
);
1463 if (x_addr_mode
!= y_addr_mode
)
1464 tmp
= convert_modes (y_addr_mode
, iter_mode
, iter
, true);
1465 y_addr
= gen_rtx_PLUS (y_addr_mode
, y_addr
, tmp
);
1467 x
= change_address (x
, QImode
, x_addr
);
1468 y
= change_address (y
, QImode
, y_addr
);
1470 emit_move_insn (x
, y
);
1472 tmp
= expand_simple_binop (iter_mode
, PLUS
, iter
, const1_rtx
, iter
,
1473 true, OPTAB_LIB_WIDEN
);
1475 emit_move_insn (iter
, tmp
);
1477 emit_label (cmp_label
);
1479 emit_cmp_and_jump_insns (iter
, size
, LT
, NULL_RTX
, iter_mode
,
1483 /* Copy all or part of a value X into registers starting at REGNO.
1484 The number of registers to be filled is NREGS. */
1487 move_block_to_reg (int regno
, rtx x
, int nregs
, enum machine_mode mode
)
1490 #ifdef HAVE_load_multiple
1498 if (CONSTANT_P (x
) && !targetm
.legitimate_constant_p (mode
, x
))
1499 x
= validize_mem (force_const_mem (mode
, x
));
1501 /* See if the machine can do this with a load multiple insn. */
1502 #ifdef HAVE_load_multiple
1503 if (HAVE_load_multiple
)
1505 last
= get_last_insn ();
1506 pat
= gen_load_multiple (gen_rtx_REG (word_mode
, regno
), x
,
1514 delete_insns_since (last
);
1518 for (i
= 0; i
< nregs
; i
++)
1519 emit_move_insn (gen_rtx_REG (word_mode
, regno
+ i
),
1520 operand_subword_force (x
, i
, mode
));
1523 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1524 The number of registers to be filled is NREGS. */
1527 move_block_from_reg (int regno
, rtx x
, int nregs
)
1534 /* See if the machine can do this with a store multiple insn. */
1535 #ifdef HAVE_store_multiple
1536 if (HAVE_store_multiple
)
1538 rtx last
= get_last_insn ();
1539 rtx pat
= gen_store_multiple (x
, gen_rtx_REG (word_mode
, regno
),
1547 delete_insns_since (last
);
1551 for (i
= 0; i
< nregs
; i
++)
1553 rtx tem
= operand_subword (x
, i
, 1, BLKmode
);
1557 emit_move_insn (tem
, gen_rtx_REG (word_mode
, regno
+ i
));
1561 /* Generate a PARALLEL rtx for a new non-consecutive group of registers from
1562 ORIG, where ORIG is a non-consecutive group of registers represented by
1563 a PARALLEL. The clone is identical to the original except in that the
1564 original set of registers is replaced by a new set of pseudo registers.
1565 The new set has the same modes as the original set. */
1568 gen_group_rtx (rtx orig
)
1573 gcc_assert (GET_CODE (orig
) == PARALLEL
);
1575 length
= XVECLEN (orig
, 0);
1576 tmps
= XALLOCAVEC (rtx
, length
);
1578 /* Skip a NULL entry in first slot. */
1579 i
= XEXP (XVECEXP (orig
, 0, 0), 0) ? 0 : 1;
1584 for (; i
< length
; i
++)
1586 enum machine_mode mode
= GET_MODE (XEXP (XVECEXP (orig
, 0, i
), 0));
1587 rtx offset
= XEXP (XVECEXP (orig
, 0, i
), 1);
1589 tmps
[i
] = gen_rtx_EXPR_LIST (VOIDmode
, gen_reg_rtx (mode
), offset
);
1592 return gen_rtx_PARALLEL (GET_MODE (orig
), gen_rtvec_v (length
, tmps
));
1595 /* A subroutine of emit_group_load. Arguments as for emit_group_load,
1596 except that values are placed in TMPS[i], and must later be moved
1597 into corresponding XEXP (XVECEXP (DST, 0, i), 0) element. */
1600 emit_group_load_1 (rtx
*tmps
, rtx dst
, rtx orig_src
, tree type
, int ssize
)
1604 enum machine_mode m
= GET_MODE (orig_src
);
1606 gcc_assert (GET_CODE (dst
) == PARALLEL
);
1609 && !SCALAR_INT_MODE_P (m
)
1610 && !MEM_P (orig_src
)
1611 && GET_CODE (orig_src
) != CONCAT
)
1613 enum machine_mode imode
= int_mode_for_mode (GET_MODE (orig_src
));
1614 if (imode
== BLKmode
)
1615 src
= assign_stack_temp (GET_MODE (orig_src
), ssize
, 0);
1617 src
= gen_reg_rtx (imode
);
1618 if (imode
!= BLKmode
)
1619 src
= gen_lowpart (GET_MODE (orig_src
), src
);
1620 emit_move_insn (src
, orig_src
);
1621 /* ...and back again. */
1622 if (imode
!= BLKmode
)
1623 src
= gen_lowpart (imode
, src
);
1624 emit_group_load_1 (tmps
, dst
, src
, type
, ssize
);
1628 /* Check for a NULL entry, used to indicate that the parameter goes
1629 both on the stack and in registers. */
1630 if (XEXP (XVECEXP (dst
, 0, 0), 0))
1635 /* Process the pieces. */
1636 for (i
= start
; i
< XVECLEN (dst
, 0); i
++)
1638 enum machine_mode mode
= GET_MODE (XEXP (XVECEXP (dst
, 0, i
), 0));
1639 HOST_WIDE_INT bytepos
= INTVAL (XEXP (XVECEXP (dst
, 0, i
), 1));
1640 unsigned int bytelen
= GET_MODE_SIZE (mode
);
1643 /* Handle trailing fragments that run over the size of the struct. */
1644 if (ssize
>= 0 && bytepos
+ (HOST_WIDE_INT
) bytelen
> ssize
)
1646 /* Arrange to shift the fragment to where it belongs.
1647 extract_bit_field loads to the lsb of the reg. */
1649 #ifdef BLOCK_REG_PADDING
1650 BLOCK_REG_PADDING (GET_MODE (orig_src
), type
, i
== start
)
1651 == (BYTES_BIG_ENDIAN
? upward
: downward
)
1656 shift
= (bytelen
- (ssize
- bytepos
)) * BITS_PER_UNIT
;
1657 bytelen
= ssize
- bytepos
;
1658 gcc_assert (bytelen
> 0);
1661 /* If we won't be loading directly from memory, protect the real source
1662 from strange tricks we might play; but make sure that the source can
1663 be loaded directly into the destination. */
1665 if (!MEM_P (orig_src
)
1666 && (!CONSTANT_P (orig_src
)
1667 || (GET_MODE (orig_src
) != mode
1668 && GET_MODE (orig_src
) != VOIDmode
)))
1670 if (GET_MODE (orig_src
) == VOIDmode
)
1671 src
= gen_reg_rtx (mode
);
1673 src
= gen_reg_rtx (GET_MODE (orig_src
));
1675 emit_move_insn (src
, orig_src
);
1678 /* Optimize the access just a bit. */
1680 && (! SLOW_UNALIGNED_ACCESS (mode
, MEM_ALIGN (src
))
1681 || MEM_ALIGN (src
) >= GET_MODE_ALIGNMENT (mode
))
1682 && bytepos
* BITS_PER_UNIT
% GET_MODE_ALIGNMENT (mode
) == 0
1683 && bytelen
== GET_MODE_SIZE (mode
))
1685 tmps
[i
] = gen_reg_rtx (mode
);
1686 emit_move_insn (tmps
[i
], adjust_address (src
, mode
, bytepos
));
1688 else if (COMPLEX_MODE_P (mode
)
1689 && GET_MODE (src
) == mode
1690 && bytelen
== GET_MODE_SIZE (mode
))
1691 /* Let emit_move_complex do the bulk of the work. */
1693 else if (GET_CODE (src
) == CONCAT
)
1695 unsigned int slen
= GET_MODE_SIZE (GET_MODE (src
));
1696 unsigned int slen0
= GET_MODE_SIZE (GET_MODE (XEXP (src
, 0)));
1698 if ((bytepos
== 0 && bytelen
== slen0
)
1699 || (bytepos
!= 0 && bytepos
+ bytelen
<= slen
))
1701 /* The following assumes that the concatenated objects all
1702 have the same size. In this case, a simple calculation
1703 can be used to determine the object and the bit field
1705 tmps
[i
] = XEXP (src
, bytepos
/ slen0
);
1706 if (! CONSTANT_P (tmps
[i
])
1707 && (!REG_P (tmps
[i
]) || GET_MODE (tmps
[i
]) != mode
))
1708 tmps
[i
] = extract_bit_field (tmps
[i
], bytelen
* BITS_PER_UNIT
,
1709 (bytepos
% slen0
) * BITS_PER_UNIT
,
1710 1, false, NULL_RTX
, mode
, mode
);
1716 gcc_assert (!bytepos
);
1717 mem
= assign_stack_temp (GET_MODE (src
), slen
, 0);
1718 emit_move_insn (mem
, src
);
1719 tmps
[i
] = extract_bit_field (mem
, bytelen
* BITS_PER_UNIT
,
1720 0, 1, false, NULL_RTX
, mode
, mode
);
1723 /* FIXME: A SIMD parallel will eventually lead to a subreg of a
1724 SIMD register, which is currently broken. While we get GCC
1725 to emit proper RTL for these cases, let's dump to memory. */
1726 else if (VECTOR_MODE_P (GET_MODE (dst
))
1729 int slen
= GET_MODE_SIZE (GET_MODE (src
));
1732 mem
= assign_stack_temp (GET_MODE (src
), slen
, 0);
1733 emit_move_insn (mem
, src
);
1734 tmps
[i
] = adjust_address (mem
, mode
, (int) bytepos
);
1736 else if (CONSTANT_P (src
) && GET_MODE (dst
) != BLKmode
1737 && XVECLEN (dst
, 0) > 1)
1738 tmps
[i
] = simplify_gen_subreg (mode
, src
, GET_MODE(dst
), bytepos
);
1739 else if (CONSTANT_P (src
))
1741 HOST_WIDE_INT len
= (HOST_WIDE_INT
) bytelen
;
1749 gcc_assert (2 * len
== ssize
);
1750 split_double (src
, &first
, &second
);
1757 else if (REG_P (src
) && GET_MODE (src
) == mode
)
1760 tmps
[i
] = extract_bit_field (src
, bytelen
* BITS_PER_UNIT
,
1761 bytepos
* BITS_PER_UNIT
, 1, false, NULL_RTX
,
1765 tmps
[i
] = expand_shift (LSHIFT_EXPR
, mode
, tmps
[i
],
1770 /* Emit code to move a block SRC of type TYPE to a block DST,
1771 where DST is non-consecutive registers represented by a PARALLEL.
1772 SSIZE represents the total size of block ORIG_SRC in bytes, or -1
1776 emit_group_load (rtx dst
, rtx src
, tree type
, int ssize
)
1781 tmps
= XALLOCAVEC (rtx
, XVECLEN (dst
, 0));
1782 emit_group_load_1 (tmps
, dst
, src
, type
, ssize
);
1784 /* Copy the extracted pieces into the proper (probable) hard regs. */
1785 for (i
= 0; i
< XVECLEN (dst
, 0); i
++)
1787 rtx d
= XEXP (XVECEXP (dst
, 0, i
), 0);
1790 emit_move_insn (d
, tmps
[i
]);
1794 /* Similar, but load SRC into new pseudos in a format that looks like
1795 PARALLEL. This can later be fed to emit_group_move to get things
1796 in the right place. */
1799 emit_group_load_into_temps (rtx parallel
, rtx src
, tree type
, int ssize
)
1804 vec
= rtvec_alloc (XVECLEN (parallel
, 0));
1805 emit_group_load_1 (&RTVEC_ELT (vec
, 0), parallel
, src
, type
, ssize
);
1807 /* Convert the vector to look just like the original PARALLEL, except
1808 with the computed values. */
1809 for (i
= 0; i
< XVECLEN (parallel
, 0); i
++)
1811 rtx e
= XVECEXP (parallel
, 0, i
);
1812 rtx d
= XEXP (e
, 0);
1816 d
= force_reg (GET_MODE (d
), RTVEC_ELT (vec
, i
));
1817 e
= alloc_EXPR_LIST (REG_NOTE_KIND (e
), d
, XEXP (e
, 1));
1819 RTVEC_ELT (vec
, i
) = e
;
1822 return gen_rtx_PARALLEL (GET_MODE (parallel
), vec
);
1825 /* Emit code to move a block SRC to block DST, where SRC and DST are
1826 non-consecutive groups of registers, each represented by a PARALLEL. */
1829 emit_group_move (rtx dst
, rtx src
)
1833 gcc_assert (GET_CODE (src
) == PARALLEL
1834 && GET_CODE (dst
) == PARALLEL
1835 && XVECLEN (src
, 0) == XVECLEN (dst
, 0));
1837 /* Skip first entry if NULL. */
1838 for (i
= XEXP (XVECEXP (src
, 0, 0), 0) ? 0 : 1; i
< XVECLEN (src
, 0); i
++)
1839 emit_move_insn (XEXP (XVECEXP (dst
, 0, i
), 0),
1840 XEXP (XVECEXP (src
, 0, i
), 0));
1843 /* Move a group of registers represented by a PARALLEL into pseudos. */
1846 emit_group_move_into_temps (rtx src
)
1848 rtvec vec
= rtvec_alloc (XVECLEN (src
, 0));
1851 for (i
= 0; i
< XVECLEN (src
, 0); i
++)
1853 rtx e
= XVECEXP (src
, 0, i
);
1854 rtx d
= XEXP (e
, 0);
1857 e
= alloc_EXPR_LIST (REG_NOTE_KIND (e
), copy_to_reg (d
), XEXP (e
, 1));
1858 RTVEC_ELT (vec
, i
) = e
;
1861 return gen_rtx_PARALLEL (GET_MODE (src
), vec
);
1864 /* Emit code to move a block SRC to a block ORIG_DST of type TYPE,
1865 where SRC is non-consecutive registers represented by a PARALLEL.
1866 SSIZE represents the total size of block ORIG_DST, or -1 if not
1870 emit_group_store (rtx orig_dst
, rtx src
, tree type ATTRIBUTE_UNUSED
, int ssize
)
1873 int start
, finish
, i
;
1874 enum machine_mode m
= GET_MODE (orig_dst
);
1876 gcc_assert (GET_CODE (src
) == PARALLEL
);
1878 if (!SCALAR_INT_MODE_P (m
)
1879 && !MEM_P (orig_dst
) && GET_CODE (orig_dst
) != CONCAT
)
1881 enum machine_mode imode
= int_mode_for_mode (GET_MODE (orig_dst
));
1882 if (imode
== BLKmode
)
1883 dst
= assign_stack_temp (GET_MODE (orig_dst
), ssize
, 0);
1885 dst
= gen_reg_rtx (imode
);
1886 emit_group_store (dst
, src
, type
, ssize
);
1887 if (imode
!= BLKmode
)
1888 dst
= gen_lowpart (GET_MODE (orig_dst
), dst
);
1889 emit_move_insn (orig_dst
, dst
);
1893 /* Check for a NULL entry, used to indicate that the parameter goes
1894 both on the stack and in registers. */
1895 if (XEXP (XVECEXP (src
, 0, 0), 0))
1899 finish
= XVECLEN (src
, 0);
1901 tmps
= XALLOCAVEC (rtx
, finish
);
1903 /* Copy the (probable) hard regs into pseudos. */
1904 for (i
= start
; i
< finish
; i
++)
1906 rtx reg
= XEXP (XVECEXP (src
, 0, i
), 0);
1907 if (!REG_P (reg
) || REGNO (reg
) < FIRST_PSEUDO_REGISTER
)
1909 tmps
[i
] = gen_reg_rtx (GET_MODE (reg
));
1910 emit_move_insn (tmps
[i
], reg
);
1916 /* If we won't be storing directly into memory, protect the real destination
1917 from strange tricks we might play. */
1919 if (GET_CODE (dst
) == PARALLEL
)
1923 /* We can get a PARALLEL dst if there is a conditional expression in
1924 a return statement. In that case, the dst and src are the same,
1925 so no action is necessary. */
1926 if (rtx_equal_p (dst
, src
))
1929 /* It is unclear if we can ever reach here, but we may as well handle
1930 it. Allocate a temporary, and split this into a store/load to/from
1933 temp
= assign_stack_temp (GET_MODE (dst
), ssize
, 0);
1934 emit_group_store (temp
, src
, type
, ssize
);
1935 emit_group_load (dst
, temp
, type
, ssize
);
1938 else if (!MEM_P (dst
) && GET_CODE (dst
) != CONCAT
)
1940 enum machine_mode outer
= GET_MODE (dst
);
1941 enum machine_mode inner
;
1942 HOST_WIDE_INT bytepos
;
1946 if (!REG_P (dst
) || REGNO (dst
) < FIRST_PSEUDO_REGISTER
)
1947 dst
= gen_reg_rtx (outer
);
1949 /* Make life a bit easier for combine. */
1950 /* If the first element of the vector is the low part
1951 of the destination mode, use a paradoxical subreg to
1952 initialize the destination. */
1955 inner
= GET_MODE (tmps
[start
]);
1956 bytepos
= subreg_lowpart_offset (inner
, outer
);
1957 if (INTVAL (XEXP (XVECEXP (src
, 0, start
), 1)) == bytepos
)
1959 temp
= simplify_gen_subreg (outer
, tmps
[start
],
1963 emit_move_insn (dst
, temp
);
1970 /* If the first element wasn't the low part, try the last. */
1972 && start
< finish
- 1)
1974 inner
= GET_MODE (tmps
[finish
- 1]);
1975 bytepos
= subreg_lowpart_offset (inner
, outer
);
1976 if (INTVAL (XEXP (XVECEXP (src
, 0, finish
- 1), 1)) == bytepos
)
1978 temp
= simplify_gen_subreg (outer
, tmps
[finish
- 1],
1982 emit_move_insn (dst
, temp
);
1989 /* Otherwise, simply initialize the result to zero. */
1991 emit_move_insn (dst
, CONST0_RTX (outer
));
1994 /* Process the pieces. */
1995 for (i
= start
; i
< finish
; i
++)
1997 HOST_WIDE_INT bytepos
= INTVAL (XEXP (XVECEXP (src
, 0, i
), 1));
1998 enum machine_mode mode
= GET_MODE (tmps
[i
]);
1999 unsigned int bytelen
= GET_MODE_SIZE (mode
);
2000 unsigned int adj_bytelen
= bytelen
;
2003 /* Handle trailing fragments that run over the size of the struct. */
2004 if (ssize
>= 0 && bytepos
+ (HOST_WIDE_INT
) bytelen
> ssize
)
2005 adj_bytelen
= ssize
- bytepos
;
2007 if (GET_CODE (dst
) == CONCAT
)
2009 if (bytepos
+ adj_bytelen
2010 <= GET_MODE_SIZE (GET_MODE (XEXP (dst
, 0))))
2011 dest
= XEXP (dst
, 0);
2012 else if (bytepos
>= GET_MODE_SIZE (GET_MODE (XEXP (dst
, 0))))
2014 bytepos
-= GET_MODE_SIZE (GET_MODE (XEXP (dst
, 0)));
2015 dest
= XEXP (dst
, 1);
2019 enum machine_mode dest_mode
= GET_MODE (dest
);
2020 enum machine_mode tmp_mode
= GET_MODE (tmps
[i
]);
2022 gcc_assert (bytepos
== 0 && XVECLEN (src
, 0));
2024 if (GET_MODE_ALIGNMENT (dest_mode
)
2025 >= GET_MODE_ALIGNMENT (tmp_mode
))
2027 dest
= assign_stack_temp (dest_mode
,
2028 GET_MODE_SIZE (dest_mode
),
2030 emit_move_insn (adjust_address (dest
,
2038 dest
= assign_stack_temp (tmp_mode
,
2039 GET_MODE_SIZE (tmp_mode
),
2041 emit_move_insn (dest
, tmps
[i
]);
2042 dst
= adjust_address (dest
, dest_mode
, bytepos
);
2048 if (ssize
>= 0 && bytepos
+ (HOST_WIDE_INT
) bytelen
> ssize
)
2050 /* store_bit_field always takes its value from the lsb.
2051 Move the fragment to the lsb if it's not already there. */
2053 #ifdef BLOCK_REG_PADDING
2054 BLOCK_REG_PADDING (GET_MODE (orig_dst
), type
, i
== start
)
2055 == (BYTES_BIG_ENDIAN
? upward
: downward
)
2061 int shift
= (bytelen
- (ssize
- bytepos
)) * BITS_PER_UNIT
;
2062 tmps
[i
] = expand_shift (RSHIFT_EXPR
, mode
, tmps
[i
],
2065 bytelen
= adj_bytelen
;
2068 /* Optimize the access just a bit. */
2070 && (! SLOW_UNALIGNED_ACCESS (mode
, MEM_ALIGN (dest
))
2071 || MEM_ALIGN (dest
) >= GET_MODE_ALIGNMENT (mode
))
2072 && bytepos
* BITS_PER_UNIT
% GET_MODE_ALIGNMENT (mode
) == 0
2073 && bytelen
== GET_MODE_SIZE (mode
))
2074 emit_move_insn (adjust_address (dest
, mode
, bytepos
), tmps
[i
]);
2076 store_bit_field (dest
, bytelen
* BITS_PER_UNIT
, bytepos
* BITS_PER_UNIT
,
2077 0, 0, mode
, tmps
[i
]);
2080 /* Copy from the pseudo into the (probable) hard reg. */
2081 if (orig_dst
!= dst
)
2082 emit_move_insn (orig_dst
, dst
);
2085 /* Generate code to copy a BLKmode object of TYPE out of a
2086 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2087 is null, a stack temporary is created. TGTBLK is returned.
2089 The purpose of this routine is to handle functions that return
2090 BLKmode structures in registers. Some machines (the PA for example)
2091 want to return all small structures in registers regardless of the
2092 structure's alignment. */
2095 copy_blkmode_from_reg (rtx tgtblk
, rtx srcreg
, tree type
)
2097 unsigned HOST_WIDE_INT bytes
= int_size_in_bytes (type
);
2098 rtx src
= NULL
, dst
= NULL
;
2099 unsigned HOST_WIDE_INT bitsize
= MIN (TYPE_ALIGN (type
), BITS_PER_WORD
);
2100 unsigned HOST_WIDE_INT bitpos
, xbitpos
, padding_correction
= 0;
2101 enum machine_mode copy_mode
;
2105 tgtblk
= assign_temp (build_qualified_type (type
,
2107 | TYPE_QUAL_CONST
)),
2109 preserve_temp_slots (tgtblk
);
2112 /* This code assumes srcreg is at least a full word. If it isn't, copy it
2113 into a new pseudo which is a full word. */
2115 if (GET_MODE (srcreg
) != BLKmode
2116 && GET_MODE_SIZE (GET_MODE (srcreg
)) < UNITS_PER_WORD
)
2117 srcreg
= convert_to_mode (word_mode
, srcreg
, TYPE_UNSIGNED (type
));
2119 /* If the structure doesn't take up a whole number of words, see whether
2120 SRCREG is padded on the left or on the right. If it's on the left,
2121 set PADDING_CORRECTION to the number of bits to skip.
2123 In most ABIs, the structure will be returned at the least end of
2124 the register, which translates to right padding on little-endian
2125 targets and left padding on big-endian targets. The opposite
2126 holds if the structure is returned at the most significant
2127 end of the register. */
2128 if (bytes
% UNITS_PER_WORD
!= 0
2129 && (targetm
.calls
.return_in_msb (type
)
2131 : BYTES_BIG_ENDIAN
))
2133 = (BITS_PER_WORD
- ((bytes
% UNITS_PER_WORD
) * BITS_PER_UNIT
));
2135 /* Copy the structure BITSIZE bits at a time. If the target lives in
2136 memory, take care of not reading/writing past its end by selecting
2137 a copy mode suited to BITSIZE. This should always be possible given
2140 We could probably emit more efficient code for machines which do not use
2141 strict alignment, but it doesn't seem worth the effort at the current
2144 copy_mode
= word_mode
;
2147 enum machine_mode mem_mode
= mode_for_size (bitsize
, MODE_INT
, 1);
2148 if (mem_mode
!= BLKmode
)
2149 copy_mode
= mem_mode
;
2152 for (bitpos
= 0, xbitpos
= padding_correction
;
2153 bitpos
< bytes
* BITS_PER_UNIT
;
2154 bitpos
+= bitsize
, xbitpos
+= bitsize
)
2156 /* We need a new source operand each time xbitpos is on a
2157 word boundary and when xbitpos == padding_correction
2158 (the first time through). */
2159 if (xbitpos
% BITS_PER_WORD
== 0
2160 || xbitpos
== padding_correction
)
2161 src
= operand_subword_force (srcreg
, xbitpos
/ BITS_PER_WORD
,
2164 /* We need a new destination operand each time bitpos is on
2166 if (bitpos
% BITS_PER_WORD
== 0)
2167 dst
= operand_subword (tgtblk
, bitpos
/ BITS_PER_WORD
, 1, BLKmode
);
2169 /* Use xbitpos for the source extraction (right justified) and
2170 bitpos for the destination store (left justified). */
2171 store_bit_field (dst
, bitsize
, bitpos
% BITS_PER_WORD
, 0, 0, copy_mode
,
2172 extract_bit_field (src
, bitsize
,
2173 xbitpos
% BITS_PER_WORD
, 1, false,
2174 NULL_RTX
, copy_mode
, copy_mode
));
2180 /* Copy BLKmode value SRC into a register of mode MODE. Return the
2181 register if it contains any data, otherwise return null.
2183 This is used on targets that return BLKmode values in registers. */
2186 copy_blkmode_to_reg (enum machine_mode mode
, tree src
)
2189 unsigned HOST_WIDE_INT bitpos
, xbitpos
, padding_correction
= 0, bytes
;
2190 unsigned int bitsize
;
2191 rtx
*dst_words
, dst
, x
, src_word
= NULL_RTX
, dst_word
= NULL_RTX
;
2192 enum machine_mode dst_mode
;
2194 gcc_assert (TYPE_MODE (TREE_TYPE (src
)) == BLKmode
);
2196 x
= expand_normal (src
);
2198 bytes
= int_size_in_bytes (TREE_TYPE (src
));
2202 /* If the structure doesn't take up a whole number of words, see
2203 whether the register value should be padded on the left or on
2204 the right. Set PADDING_CORRECTION to the number of padding
2205 bits needed on the left side.
2207 In most ABIs, the structure will be returned at the least end of
2208 the register, which translates to right padding on little-endian
2209 targets and left padding on big-endian targets. The opposite
2210 holds if the structure is returned at the most significant
2211 end of the register. */
2212 if (bytes
% UNITS_PER_WORD
!= 0
2213 && (targetm
.calls
.return_in_msb (TREE_TYPE (src
))
2215 : BYTES_BIG_ENDIAN
))
2216 padding_correction
= (BITS_PER_WORD
- ((bytes
% UNITS_PER_WORD
)
2219 n_regs
= (bytes
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
2220 dst_words
= XALLOCAVEC (rtx
, n_regs
);
2221 bitsize
= MIN (TYPE_ALIGN (TREE_TYPE (src
)), BITS_PER_WORD
);
2223 /* Copy the structure BITSIZE bits at a time. */
2224 for (bitpos
= 0, xbitpos
= padding_correction
;
2225 bitpos
< bytes
* BITS_PER_UNIT
;
2226 bitpos
+= bitsize
, xbitpos
+= bitsize
)
2228 /* We need a new destination pseudo each time xbitpos is
2229 on a word boundary and when xbitpos == padding_correction
2230 (the first time through). */
2231 if (xbitpos
% BITS_PER_WORD
== 0
2232 || xbitpos
== padding_correction
)
2234 /* Generate an appropriate register. */
2235 dst_word
= gen_reg_rtx (word_mode
);
2236 dst_words
[xbitpos
/ BITS_PER_WORD
] = dst_word
;
2238 /* Clear the destination before we move anything into it. */
2239 emit_move_insn (dst_word
, CONST0_RTX (word_mode
));
2242 /* We need a new source operand each time bitpos is on a word
2244 if (bitpos
% BITS_PER_WORD
== 0)
2245 src_word
= operand_subword_force (x
, bitpos
/ BITS_PER_WORD
, BLKmode
);
2247 /* Use bitpos for the source extraction (left justified) and
2248 xbitpos for the destination store (right justified). */
2249 store_bit_field (dst_word
, bitsize
, xbitpos
% BITS_PER_WORD
,
2251 extract_bit_field (src_word
, bitsize
,
2252 bitpos
% BITS_PER_WORD
, 1, false,
2253 NULL_RTX
, word_mode
, word_mode
));
2256 if (mode
== BLKmode
)
2258 /* Find the smallest integer mode large enough to hold the
2259 entire structure. */
2260 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
2262 mode
= GET_MODE_WIDER_MODE (mode
))
2263 /* Have we found a large enough mode? */
2264 if (GET_MODE_SIZE (mode
) >= bytes
)
2267 /* A suitable mode should have been found. */
2268 gcc_assert (mode
!= VOIDmode
);
2271 if (GET_MODE_SIZE (mode
) < GET_MODE_SIZE (word_mode
))
2272 dst_mode
= word_mode
;
2275 dst
= gen_reg_rtx (dst_mode
);
2277 for (i
= 0; i
< n_regs
; i
++)
2278 emit_move_insn (operand_subword (dst
, i
, 0, dst_mode
), dst_words
[i
]);
2280 if (mode
!= dst_mode
)
2281 dst
= gen_lowpart (mode
, dst
);
2286 /* Add a USE expression for REG to the (possibly empty) list pointed
2287 to by CALL_FUSAGE. REG must denote a hard register. */
2290 use_reg_mode (rtx
*call_fusage
, rtx reg
, enum machine_mode mode
)
2292 gcc_assert (REG_P (reg
) && REGNO (reg
) < FIRST_PSEUDO_REGISTER
);
2295 = gen_rtx_EXPR_LIST (mode
, gen_rtx_USE (VOIDmode
, reg
), *call_fusage
);
2298 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2299 starting at REGNO. All of these registers must be hard registers. */
2302 use_regs (rtx
*call_fusage
, int regno
, int nregs
)
2306 gcc_assert (regno
+ nregs
<= FIRST_PSEUDO_REGISTER
);
2308 for (i
= 0; i
< nregs
; i
++)
2309 use_reg (call_fusage
, regno_reg_rtx
[regno
+ i
]);
2312 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2313 PARALLEL REGS. This is for calls that pass values in multiple
2314 non-contiguous locations. The Irix 6 ABI has examples of this. */
2317 use_group_regs (rtx
*call_fusage
, rtx regs
)
2321 for (i
= 0; i
< XVECLEN (regs
, 0); i
++)
2323 rtx reg
= XEXP (XVECEXP (regs
, 0, i
), 0);
2325 /* A NULL entry means the parameter goes both on the stack and in
2326 registers. This can also be a MEM for targets that pass values
2327 partially on the stack and partially in registers. */
2328 if (reg
!= 0 && REG_P (reg
))
2329 use_reg (call_fusage
, reg
);
2333 /* Return the defining gimple statement for SSA_NAME NAME if it is an
2334 assigment and the code of the expresion on the RHS is CODE. Return
2338 get_def_for_expr (tree name
, enum tree_code code
)
2342 if (TREE_CODE (name
) != SSA_NAME
)
2345 def_stmt
= get_gimple_for_ssa_name (name
);
2347 || gimple_assign_rhs_code (def_stmt
) != code
)
2354 /* Determine whether the LEN bytes generated by CONSTFUN can be
2355 stored to memory using several move instructions. CONSTFUNDATA is
2356 a pointer which will be passed as argument in every CONSTFUN call.
2357 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2358 a memset operation and false if it's a copy of a constant string.
2359 Return nonzero if a call to store_by_pieces should succeed. */
2362 can_store_by_pieces (unsigned HOST_WIDE_INT len
,
2363 rtx (*constfun
) (void *, HOST_WIDE_INT
, enum machine_mode
),
2364 void *constfundata
, unsigned int align
, bool memsetp
)
2366 unsigned HOST_WIDE_INT l
;
2367 unsigned int max_size
;
2368 HOST_WIDE_INT offset
= 0;
2369 enum machine_mode mode
;
2370 enum insn_code icode
;
2372 /* cst is set but not used if LEGITIMATE_CONSTANT doesn't use it. */
2373 rtx cst ATTRIBUTE_UNUSED
;
2379 ? SET_BY_PIECES_P (len
, align
)
2380 : STORE_BY_PIECES_P (len
, align
)))
2383 align
= alignment_for_piecewise_move (STORE_MAX_PIECES
, align
);
2385 /* We would first store what we can in the largest integer mode, then go to
2386 successively smaller modes. */
2389 reverse
<= (HAVE_PRE_DECREMENT
|| HAVE_POST_DECREMENT
);
2393 max_size
= STORE_MAX_PIECES
+ 1;
2394 while (max_size
> 1)
2396 mode
= widest_int_mode_for_size (max_size
);
2398 if (mode
== VOIDmode
)
2401 icode
= optab_handler (mov_optab
, mode
);
2402 if (icode
!= CODE_FOR_nothing
2403 && align
>= GET_MODE_ALIGNMENT (mode
))
2405 unsigned int size
= GET_MODE_SIZE (mode
);
2412 cst
= (*constfun
) (constfundata
, offset
, mode
);
2413 if (!targetm
.legitimate_constant_p (mode
, cst
))
2423 max_size
= GET_MODE_SIZE (mode
);
2426 /* The code above should have handled everything. */
2433 /* Generate several move instructions to store LEN bytes generated by
2434 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
2435 pointer which will be passed as argument in every CONSTFUN call.
2436 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2437 a memset operation and false if it's a copy of a constant string.
2438 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
2439 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
2443 store_by_pieces (rtx to
, unsigned HOST_WIDE_INT len
,
2444 rtx (*constfun
) (void *, HOST_WIDE_INT
, enum machine_mode
),
2445 void *constfundata
, unsigned int align
, bool memsetp
, int endp
)
2447 enum machine_mode to_addr_mode
2448 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (to
));
2449 struct store_by_pieces_d data
;
2453 gcc_assert (endp
!= 2);
2458 ? SET_BY_PIECES_P (len
, align
)
2459 : STORE_BY_PIECES_P (len
, align
));
2460 data
.constfun
= constfun
;
2461 data
.constfundata
= constfundata
;
2464 store_by_pieces_1 (&data
, align
);
2469 gcc_assert (!data
.reverse
);
2474 if (HAVE_POST_INCREMENT
&& data
.explicit_inc_to
> 0)
2475 emit_insn (gen_add2_insn (data
.to_addr
, constm1_rtx
));
2477 data
.to_addr
= copy_to_mode_reg (to_addr_mode
,
2478 plus_constant (data
.to_addr
,
2481 to1
= adjust_automodify_address (data
.to
, QImode
, data
.to_addr
,
2488 to1
= adjust_address (data
.to
, QImode
, data
.offset
);
2496 /* Generate several move instructions to clear LEN bytes of block TO. (A MEM
2497 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2500 clear_by_pieces (rtx to
, unsigned HOST_WIDE_INT len
, unsigned int align
)
2502 struct store_by_pieces_d data
;
2507 data
.constfun
= clear_by_pieces_1
;
2508 data
.constfundata
= NULL
;
2511 store_by_pieces_1 (&data
, align
);
2514 /* Callback routine for clear_by_pieces.
2515 Return const0_rtx unconditionally. */
2518 clear_by_pieces_1 (void *data ATTRIBUTE_UNUSED
,
2519 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
,
2520 enum machine_mode mode ATTRIBUTE_UNUSED
)
2525 /* Subroutine of clear_by_pieces and store_by_pieces.
2526 Generate several move instructions to store LEN bytes of block TO. (A MEM
2527 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2530 store_by_pieces_1 (struct store_by_pieces_d
*data ATTRIBUTE_UNUSED
,
2531 unsigned int align ATTRIBUTE_UNUSED
)
2533 enum machine_mode to_addr_mode
2534 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (data
->to
));
2535 rtx to_addr
= XEXP (data
->to
, 0);
2536 unsigned int max_size
= STORE_MAX_PIECES
+ 1;
2537 enum insn_code icode
;
2540 data
->to_addr
= to_addr
;
2542 = (GET_CODE (to_addr
) == PRE_INC
|| GET_CODE (to_addr
) == PRE_DEC
2543 || GET_CODE (to_addr
) == POST_INC
|| GET_CODE (to_addr
) == POST_DEC
);
2545 data
->explicit_inc_to
= 0;
2547 = (GET_CODE (to_addr
) == PRE_DEC
|| GET_CODE (to_addr
) == POST_DEC
);
2549 data
->offset
= data
->len
;
2551 /* If storing requires more than two move insns,
2552 copy addresses to registers (to make displacements shorter)
2553 and use post-increment if available. */
2554 if (!data
->autinc_to
2555 && move_by_pieces_ninsns (data
->len
, align
, max_size
) > 2)
2557 /* Determine the main mode we'll be using.
2558 MODE might not be used depending on the definitions of the
2559 USE_* macros below. */
2560 enum machine_mode mode ATTRIBUTE_UNUSED
2561 = widest_int_mode_for_size (max_size
);
2563 if (USE_STORE_PRE_DECREMENT (mode
) && data
->reverse
&& ! data
->autinc_to
)
2565 data
->to_addr
= copy_to_mode_reg (to_addr_mode
,
2566 plus_constant (to_addr
, data
->len
));
2567 data
->autinc_to
= 1;
2568 data
->explicit_inc_to
= -1;
2571 if (USE_STORE_POST_INCREMENT (mode
) && ! data
->reverse
2572 && ! data
->autinc_to
)
2574 data
->to_addr
= copy_to_mode_reg (to_addr_mode
, to_addr
);
2575 data
->autinc_to
= 1;
2576 data
->explicit_inc_to
= 1;
2579 if ( !data
->autinc_to
&& CONSTANT_P (to_addr
))
2580 data
->to_addr
= copy_to_mode_reg (to_addr_mode
, to_addr
);
2583 align
= alignment_for_piecewise_move (STORE_MAX_PIECES
, align
);
2585 /* First store what we can in the largest integer mode, then go to
2586 successively smaller modes. */
2588 while (max_size
> 1)
2590 enum machine_mode mode
= widest_int_mode_for_size (max_size
);
2592 if (mode
== VOIDmode
)
2595 icode
= optab_handler (mov_optab
, mode
);
2596 if (icode
!= CODE_FOR_nothing
&& align
>= GET_MODE_ALIGNMENT (mode
))
2597 store_by_pieces_2 (GEN_FCN (icode
), mode
, data
);
2599 max_size
= GET_MODE_SIZE (mode
);
2602 /* The code above should have handled everything. */
2603 gcc_assert (!data
->len
);
2606 /* Subroutine of store_by_pieces_1. Store as many bytes as appropriate
2607 with move instructions for mode MODE. GENFUN is the gen_... function
2608 to make a move insn for that mode. DATA has all the other info. */
2611 store_by_pieces_2 (rtx (*genfun
) (rtx
, ...), enum machine_mode mode
,
2612 struct store_by_pieces_d
*data
)
2614 unsigned int size
= GET_MODE_SIZE (mode
);
2617 while (data
->len
>= size
)
2620 data
->offset
-= size
;
2622 if (data
->autinc_to
)
2623 to1
= adjust_automodify_address (data
->to
, mode
, data
->to_addr
,
2626 to1
= adjust_address (data
->to
, mode
, data
->offset
);
2628 if (HAVE_PRE_DECREMENT
&& data
->explicit_inc_to
< 0)
2629 emit_insn (gen_add2_insn (data
->to_addr
,
2630 GEN_INT (-(HOST_WIDE_INT
) size
)));
2632 cst
= (*data
->constfun
) (data
->constfundata
, data
->offset
, mode
);
2633 emit_insn ((*genfun
) (to1
, cst
));
2635 if (HAVE_POST_INCREMENT
&& data
->explicit_inc_to
> 0)
2636 emit_insn (gen_add2_insn (data
->to_addr
, GEN_INT (size
)));
2638 if (! data
->reverse
)
2639 data
->offset
+= size
;
2645 /* Write zeros through the storage of OBJECT. If OBJECT has BLKmode, SIZE is
2646 its length in bytes. */
2649 clear_storage_hints (rtx object
, rtx size
, enum block_op_methods method
,
2650 unsigned int expected_align
, HOST_WIDE_INT expected_size
)
2652 enum machine_mode mode
= GET_MODE (object
);
2655 gcc_assert (method
== BLOCK_OP_NORMAL
|| method
== BLOCK_OP_TAILCALL
);
2657 /* If OBJECT is not BLKmode and SIZE is the same size as its mode,
2658 just move a zero. Otherwise, do this a piece at a time. */
2660 && CONST_INT_P (size
)
2661 && INTVAL (size
) == (HOST_WIDE_INT
) GET_MODE_SIZE (mode
))
2663 rtx zero
= CONST0_RTX (mode
);
2666 emit_move_insn (object
, zero
);
2670 if (COMPLEX_MODE_P (mode
))
2672 zero
= CONST0_RTX (GET_MODE_INNER (mode
));
2675 write_complex_part (object
, zero
, 0);
2676 write_complex_part (object
, zero
, 1);
2682 if (size
== const0_rtx
)
2685 align
= MEM_ALIGN (object
);
2687 if (CONST_INT_P (size
)
2688 && CLEAR_BY_PIECES_P (INTVAL (size
), align
))
2689 clear_by_pieces (object
, INTVAL (size
), align
);
2690 else if (set_storage_via_setmem (object
, size
, const0_rtx
, align
,
2691 expected_align
, expected_size
))
2693 else if (ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (object
)))
2694 return set_storage_via_libcall (object
, size
, const0_rtx
,
2695 method
== BLOCK_OP_TAILCALL
);
2703 clear_storage (rtx object
, rtx size
, enum block_op_methods method
)
2705 return clear_storage_hints (object
, size
, method
, 0, -1);
2709 /* A subroutine of clear_storage. Expand a call to memset.
2710 Return the return value of memset, 0 otherwise. */
2713 set_storage_via_libcall (rtx object
, rtx size
, rtx val
, bool tailcall
)
2715 tree call_expr
, fn
, object_tree
, size_tree
, val_tree
;
2716 enum machine_mode size_mode
;
2719 /* Emit code to copy OBJECT and SIZE into new pseudos. We can then
2720 place those into new pseudos into a VAR_DECL and use them later. */
2722 object
= copy_to_mode_reg (Pmode
, XEXP (object
, 0));
2724 size_mode
= TYPE_MODE (sizetype
);
2725 size
= convert_to_mode (size_mode
, size
, 1);
2726 size
= copy_to_mode_reg (size_mode
, size
);
2728 /* It is incorrect to use the libcall calling conventions to call
2729 memset in this context. This could be a user call to memset and
2730 the user may wish to examine the return value from memset. For
2731 targets where libcalls and normal calls have different conventions
2732 for returning pointers, we could end up generating incorrect code. */
2734 object_tree
= make_tree (ptr_type_node
, object
);
2735 if (!CONST_INT_P (val
))
2736 val
= convert_to_mode (TYPE_MODE (integer_type_node
), val
, 1);
2737 size_tree
= make_tree (sizetype
, size
);
2738 val_tree
= make_tree (integer_type_node
, val
);
2740 fn
= clear_storage_libcall_fn (true);
2741 call_expr
= build_call_expr (fn
, 3, object_tree
, val_tree
, size_tree
);
2742 CALL_EXPR_TAILCALL (call_expr
) = tailcall
;
2744 retval
= expand_normal (call_expr
);
2749 /* A subroutine of set_storage_via_libcall. Create the tree node
2750 for the function we use for block clears. The first time FOR_CALL
2751 is true, we call assemble_external. */
2753 tree block_clear_fn
;
2756 init_block_clear_fn (const char *asmspec
)
2758 if (!block_clear_fn
)
2762 fn
= get_identifier ("memset");
2763 args
= build_function_type_list (ptr_type_node
, ptr_type_node
,
2764 integer_type_node
, sizetype
,
2767 fn
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
, fn
, args
);
2768 DECL_EXTERNAL (fn
) = 1;
2769 TREE_PUBLIC (fn
) = 1;
2770 DECL_ARTIFICIAL (fn
) = 1;
2771 TREE_NOTHROW (fn
) = 1;
2772 DECL_VISIBILITY (fn
) = VISIBILITY_DEFAULT
;
2773 DECL_VISIBILITY_SPECIFIED (fn
) = 1;
2775 block_clear_fn
= fn
;
2779 set_user_assembler_name (block_clear_fn
, asmspec
);
2783 clear_storage_libcall_fn (int for_call
)
2785 static bool emitted_extern
;
2787 if (!block_clear_fn
)
2788 init_block_clear_fn (NULL
);
2790 if (for_call
&& !emitted_extern
)
2792 emitted_extern
= true;
2793 make_decl_rtl (block_clear_fn
);
2794 assemble_external (block_clear_fn
);
2797 return block_clear_fn
;
2800 /* Expand a setmem pattern; return true if successful. */
2803 set_storage_via_setmem (rtx object
, rtx size
, rtx val
, unsigned int align
,
2804 unsigned int expected_align
, HOST_WIDE_INT expected_size
)
2806 /* Try the most limited insn first, because there's no point
2807 including more than one in the machine description unless
2808 the more limited one has some advantage. */
2810 enum machine_mode mode
;
2812 if (expected_align
< align
)
2813 expected_align
= align
;
2815 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
); mode
!= VOIDmode
;
2816 mode
= GET_MODE_WIDER_MODE (mode
))
2818 enum insn_code code
= direct_optab_handler (setmem_optab
, mode
);
2820 if (code
!= CODE_FOR_nothing
2821 /* We don't need MODE to be narrower than
2822 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2823 the mode mask, as it is returned by the macro, it will
2824 definitely be less than the actual mode mask. */
2825 && ((CONST_INT_P (size
)
2826 && ((unsigned HOST_WIDE_INT
) INTVAL (size
)
2827 <= (GET_MODE_MASK (mode
) >> 1)))
2828 || GET_MODE_BITSIZE (mode
) >= BITS_PER_WORD
))
2830 struct expand_operand ops
[6];
2833 nops
= insn_data
[(int) code
].n_generator_args
;
2834 gcc_assert (nops
== 4 || nops
== 6);
2836 create_fixed_operand (&ops
[0], object
);
2837 /* The check above guarantees that this size conversion is valid. */
2838 create_convert_operand_to (&ops
[1], size
, mode
, true);
2839 create_convert_operand_from (&ops
[2], val
, byte_mode
, true);
2840 create_integer_operand (&ops
[3], align
/ BITS_PER_UNIT
);
2843 create_integer_operand (&ops
[4], expected_align
/ BITS_PER_UNIT
);
2844 create_integer_operand (&ops
[5], expected_size
);
2846 if (maybe_expand_insn (code
, nops
, ops
))
2855 /* Write to one of the components of the complex value CPLX. Write VAL to
2856 the real part if IMAG_P is false, and the imaginary part if its true. */
2859 write_complex_part (rtx cplx
, rtx val
, bool imag_p
)
2861 enum machine_mode cmode
;
2862 enum machine_mode imode
;
2865 if (GET_CODE (cplx
) == CONCAT
)
2867 emit_move_insn (XEXP (cplx
, imag_p
), val
);
2871 cmode
= GET_MODE (cplx
);
2872 imode
= GET_MODE_INNER (cmode
);
2873 ibitsize
= GET_MODE_BITSIZE (imode
);
2875 /* For MEMs simplify_gen_subreg may generate an invalid new address
2876 because, e.g., the original address is considered mode-dependent
2877 by the target, which restricts simplify_subreg from invoking
2878 adjust_address_nv. Instead of preparing fallback support for an
2879 invalid address, we call adjust_address_nv directly. */
2882 emit_move_insn (adjust_address_nv (cplx
, imode
,
2883 imag_p
? GET_MODE_SIZE (imode
) : 0),
2888 /* If the sub-object is at least word sized, then we know that subregging
2889 will work. This special case is important, since store_bit_field
2890 wants to operate on integer modes, and there's rarely an OImode to
2891 correspond to TCmode. */
2892 if (ibitsize
>= BITS_PER_WORD
2893 /* For hard regs we have exact predicates. Assume we can split
2894 the original object if it spans an even number of hard regs.
2895 This special case is important for SCmode on 64-bit platforms
2896 where the natural size of floating-point regs is 32-bit. */
2898 && REGNO (cplx
) < FIRST_PSEUDO_REGISTER
2899 && hard_regno_nregs
[REGNO (cplx
)][cmode
] % 2 == 0))
2901 rtx part
= simplify_gen_subreg (imode
, cplx
, cmode
,
2902 imag_p
? GET_MODE_SIZE (imode
) : 0);
2905 emit_move_insn (part
, val
);
2909 /* simplify_gen_subreg may fail for sub-word MEMs. */
2910 gcc_assert (MEM_P (cplx
) && ibitsize
< BITS_PER_WORD
);
2913 store_bit_field (cplx
, ibitsize
, imag_p
? ibitsize
: 0, 0, 0, imode
, val
);
2916 /* Extract one of the components of the complex value CPLX. Extract the
2917 real part if IMAG_P is false, and the imaginary part if it's true. */
2920 read_complex_part (rtx cplx
, bool imag_p
)
2922 enum machine_mode cmode
, imode
;
2925 if (GET_CODE (cplx
) == CONCAT
)
2926 return XEXP (cplx
, imag_p
);
2928 cmode
= GET_MODE (cplx
);
2929 imode
= GET_MODE_INNER (cmode
);
2930 ibitsize
= GET_MODE_BITSIZE (imode
);
2932 /* Special case reads from complex constants that got spilled to memory. */
2933 if (MEM_P (cplx
) && GET_CODE (XEXP (cplx
, 0)) == SYMBOL_REF
)
2935 tree decl
= SYMBOL_REF_DECL (XEXP (cplx
, 0));
2936 if (decl
&& TREE_CODE (decl
) == COMPLEX_CST
)
2938 tree part
= imag_p
? TREE_IMAGPART (decl
) : TREE_REALPART (decl
);
2939 if (CONSTANT_CLASS_P (part
))
2940 return expand_expr (part
, NULL_RTX
, imode
, EXPAND_NORMAL
);
2944 /* For MEMs simplify_gen_subreg may generate an invalid new address
2945 because, e.g., the original address is considered mode-dependent
2946 by the target, which restricts simplify_subreg from invoking
2947 adjust_address_nv. Instead of preparing fallback support for an
2948 invalid address, we call adjust_address_nv directly. */
2950 return adjust_address_nv (cplx
, imode
,
2951 imag_p
? GET_MODE_SIZE (imode
) : 0);
2953 /* If the sub-object is at least word sized, then we know that subregging
2954 will work. This special case is important, since extract_bit_field
2955 wants to operate on integer modes, and there's rarely an OImode to
2956 correspond to TCmode. */
2957 if (ibitsize
>= BITS_PER_WORD
2958 /* For hard regs we have exact predicates. Assume we can split
2959 the original object if it spans an even number of hard regs.
2960 This special case is important for SCmode on 64-bit platforms
2961 where the natural size of floating-point regs is 32-bit. */
2963 && REGNO (cplx
) < FIRST_PSEUDO_REGISTER
2964 && hard_regno_nregs
[REGNO (cplx
)][cmode
] % 2 == 0))
2966 rtx ret
= simplify_gen_subreg (imode
, cplx
, cmode
,
2967 imag_p
? GET_MODE_SIZE (imode
) : 0);
2971 /* simplify_gen_subreg may fail for sub-word MEMs. */
2972 gcc_assert (MEM_P (cplx
) && ibitsize
< BITS_PER_WORD
);
2975 return extract_bit_field (cplx
, ibitsize
, imag_p
? ibitsize
: 0,
2976 true, false, NULL_RTX
, imode
, imode
);
2979 /* A subroutine of emit_move_insn_1. Yet another lowpart generator.
2980 NEW_MODE and OLD_MODE are the same size. Return NULL if X cannot be
2981 represented in NEW_MODE. If FORCE is true, this will never happen, as
2982 we'll force-create a SUBREG if needed. */
2985 emit_move_change_mode (enum machine_mode new_mode
,
2986 enum machine_mode old_mode
, rtx x
, bool force
)
2990 if (push_operand (x
, GET_MODE (x
)))
2992 ret
= gen_rtx_MEM (new_mode
, XEXP (x
, 0));
2993 MEM_COPY_ATTRIBUTES (ret
, x
);
2997 /* We don't have to worry about changing the address since the
2998 size in bytes is supposed to be the same. */
2999 if (reload_in_progress
)
3001 /* Copy the MEM to change the mode and move any
3002 substitutions from the old MEM to the new one. */
3003 ret
= adjust_address_nv (x
, new_mode
, 0);
3004 copy_replacements (x
, ret
);
3007 ret
= adjust_address (x
, new_mode
, 0);
3011 /* Note that we do want simplify_subreg's behavior of validating
3012 that the new mode is ok for a hard register. If we were to use
3013 simplify_gen_subreg, we would create the subreg, but would
3014 probably run into the target not being able to implement it. */
3015 /* Except, of course, when FORCE is true, when this is exactly what
3016 we want. Which is needed for CCmodes on some targets. */
3018 ret
= simplify_gen_subreg (new_mode
, x
, old_mode
, 0);
3020 ret
= simplify_subreg (new_mode
, x
, old_mode
, 0);
3026 /* A subroutine of emit_move_insn_1. Generate a move from Y into X using
3027 an integer mode of the same size as MODE. Returns the instruction
3028 emitted, or NULL if such a move could not be generated. */
3031 emit_move_via_integer (enum machine_mode mode
, rtx x
, rtx y
, bool force
)
3033 enum machine_mode imode
;
3034 enum insn_code code
;
3036 /* There must exist a mode of the exact size we require. */
3037 imode
= int_mode_for_mode (mode
);
3038 if (imode
== BLKmode
)
3041 /* The target must support moves in this mode. */
3042 code
= optab_handler (mov_optab
, imode
);
3043 if (code
== CODE_FOR_nothing
)
3046 x
= emit_move_change_mode (imode
, mode
, x
, force
);
3049 y
= emit_move_change_mode (imode
, mode
, y
, force
);
3052 return emit_insn (GEN_FCN (code
) (x
, y
));
3055 /* A subroutine of emit_move_insn_1. X is a push_operand in MODE.
3056 Return an equivalent MEM that does not use an auto-increment. */
3059 emit_move_resolve_push (enum machine_mode mode
, rtx x
)
3061 enum rtx_code code
= GET_CODE (XEXP (x
, 0));
3062 HOST_WIDE_INT adjust
;
3065 adjust
= GET_MODE_SIZE (mode
);
3066 #ifdef PUSH_ROUNDING
3067 adjust
= PUSH_ROUNDING (adjust
);
3069 if (code
== PRE_DEC
|| code
== POST_DEC
)
3071 else if (code
== PRE_MODIFY
|| code
== POST_MODIFY
)
3073 rtx expr
= XEXP (XEXP (x
, 0), 1);
3076 gcc_assert (GET_CODE (expr
) == PLUS
|| GET_CODE (expr
) == MINUS
);
3077 gcc_assert (CONST_INT_P (XEXP (expr
, 1)));
3078 val
= INTVAL (XEXP (expr
, 1));
3079 if (GET_CODE (expr
) == MINUS
)
3081 gcc_assert (adjust
== val
|| adjust
== -val
);
3085 /* Do not use anti_adjust_stack, since we don't want to update
3086 stack_pointer_delta. */
3087 temp
= expand_simple_binop (Pmode
, PLUS
, stack_pointer_rtx
,
3088 GEN_INT (adjust
), stack_pointer_rtx
,
3089 0, OPTAB_LIB_WIDEN
);
3090 if (temp
!= stack_pointer_rtx
)
3091 emit_move_insn (stack_pointer_rtx
, temp
);
3098 temp
= stack_pointer_rtx
;
3103 temp
= plus_constant (stack_pointer_rtx
, -adjust
);
3109 return replace_equiv_address (x
, temp
);
3112 /* A subroutine of emit_move_complex. Generate a move from Y into X.
3113 X is known to satisfy push_operand, and MODE is known to be complex.
3114 Returns the last instruction emitted. */
3117 emit_move_complex_push (enum machine_mode mode
, rtx x
, rtx y
)
3119 enum machine_mode submode
= GET_MODE_INNER (mode
);
3122 #ifdef PUSH_ROUNDING
3123 unsigned int submodesize
= GET_MODE_SIZE (submode
);
3125 /* In case we output to the stack, but the size is smaller than the
3126 machine can push exactly, we need to use move instructions. */
3127 if (PUSH_ROUNDING (submodesize
) != submodesize
)
3129 x
= emit_move_resolve_push (mode
, x
);
3130 return emit_move_insn (x
, y
);
3134 /* Note that the real part always precedes the imag part in memory
3135 regardless of machine's endianness. */
3136 switch (GET_CODE (XEXP (x
, 0)))
3150 emit_move_insn (gen_rtx_MEM (submode
, XEXP (x
, 0)),
3151 read_complex_part (y
, imag_first
));
3152 return emit_move_insn (gen_rtx_MEM (submode
, XEXP (x
, 0)),
3153 read_complex_part (y
, !imag_first
));
3156 /* A subroutine of emit_move_complex. Perform the move from Y to X
3157 via two moves of the parts. Returns the last instruction emitted. */
3160 emit_move_complex_parts (rtx x
, rtx y
)
3162 /* Show the output dies here. This is necessary for SUBREGs
3163 of pseudos since we cannot track their lifetimes correctly;
3164 hard regs shouldn't appear here except as return values. */
3165 if (!reload_completed
&& !reload_in_progress
3166 && REG_P (x
) && !reg_overlap_mentioned_p (x
, y
))
3169 write_complex_part (x
, read_complex_part (y
, false), false);
3170 write_complex_part (x
, read_complex_part (y
, true), true);
3172 return get_last_insn ();
3175 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3176 MODE is known to be complex. Returns the last instruction emitted. */
3179 emit_move_complex (enum machine_mode mode
, rtx x
, rtx y
)
3183 /* Need to take special care for pushes, to maintain proper ordering
3184 of the data, and possibly extra padding. */
3185 if (push_operand (x
, mode
))
3186 return emit_move_complex_push (mode
, x
, y
);
3188 /* See if we can coerce the target into moving both values at once. */
3190 /* Move floating point as parts. */
3191 if (GET_MODE_CLASS (mode
) == MODE_COMPLEX_FLOAT
3192 && optab_handler (mov_optab
, GET_MODE_INNER (mode
)) != CODE_FOR_nothing
)
3194 /* Not possible if the values are inherently not adjacent. */
3195 else if (GET_CODE (x
) == CONCAT
|| GET_CODE (y
) == CONCAT
)
3197 /* Is possible if both are registers (or subregs of registers). */
3198 else if (register_operand (x
, mode
) && register_operand (y
, mode
))
3200 /* If one of the operands is a memory, and alignment constraints
3201 are friendly enough, we may be able to do combined memory operations.
3202 We do not attempt this if Y is a constant because that combination is
3203 usually better with the by-parts thing below. */
3204 else if ((MEM_P (x
) ? !CONSTANT_P (y
) : MEM_P (y
))
3205 && (!STRICT_ALIGNMENT
3206 || get_mode_alignment (mode
) == BIGGEST_ALIGNMENT
))
3215 /* For memory to memory moves, optimal behavior can be had with the
3216 existing block move logic. */
3217 if (MEM_P (x
) && MEM_P (y
))
3219 emit_block_move (x
, y
, GEN_INT (GET_MODE_SIZE (mode
)),
3220 BLOCK_OP_NO_LIBCALL
);
3221 return get_last_insn ();
3224 ret
= emit_move_via_integer (mode
, x
, y
, true);
3229 return emit_move_complex_parts (x
, y
);
3232 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3233 MODE is known to be MODE_CC. Returns the last instruction emitted. */
3236 emit_move_ccmode (enum machine_mode mode
, rtx x
, rtx y
)
3240 /* Assume all MODE_CC modes are equivalent; if we have movcc, use it. */
3243 enum insn_code code
= optab_handler (mov_optab
, CCmode
);
3244 if (code
!= CODE_FOR_nothing
)
3246 x
= emit_move_change_mode (CCmode
, mode
, x
, true);
3247 y
= emit_move_change_mode (CCmode
, mode
, y
, true);
3248 return emit_insn (GEN_FCN (code
) (x
, y
));
3252 /* Otherwise, find the MODE_INT mode of the same width. */
3253 ret
= emit_move_via_integer (mode
, x
, y
, false);
3254 gcc_assert (ret
!= NULL
);
3258 /* Return true if word I of OP lies entirely in the
3259 undefined bits of a paradoxical subreg. */
3262 undefined_operand_subword_p (const_rtx op
, int i
)
3264 enum machine_mode innermode
, innermostmode
;
3266 if (GET_CODE (op
) != SUBREG
)
3268 innermode
= GET_MODE (op
);
3269 innermostmode
= GET_MODE (SUBREG_REG (op
));
3270 offset
= i
* UNITS_PER_WORD
+ SUBREG_BYTE (op
);
3271 /* The SUBREG_BYTE represents offset, as if the value were stored in
3272 memory, except for a paradoxical subreg where we define
3273 SUBREG_BYTE to be 0; undo this exception as in
3275 if (SUBREG_BYTE (op
) == 0
3276 && GET_MODE_SIZE (innermostmode
) < GET_MODE_SIZE (innermode
))
3278 int difference
= (GET_MODE_SIZE (innermostmode
) - GET_MODE_SIZE (innermode
));
3279 if (WORDS_BIG_ENDIAN
)
3280 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
3281 if (BYTES_BIG_ENDIAN
)
3282 offset
+= difference
% UNITS_PER_WORD
;
3284 if (offset
>= GET_MODE_SIZE (innermostmode
)
3285 || offset
<= -GET_MODE_SIZE (word_mode
))
3290 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3291 MODE is any multi-word or full-word mode that lacks a move_insn
3292 pattern. Note that you will get better code if you define such
3293 patterns, even if they must turn into multiple assembler instructions. */
3296 emit_move_multi_word (enum machine_mode mode
, rtx x
, rtx y
)
3303 gcc_assert (GET_MODE_SIZE (mode
) >= UNITS_PER_WORD
);
3305 /* If X is a push on the stack, do the push now and replace
3306 X with a reference to the stack pointer. */
3307 if (push_operand (x
, mode
))
3308 x
= emit_move_resolve_push (mode
, x
);
3310 /* If we are in reload, see if either operand is a MEM whose address
3311 is scheduled for replacement. */
3312 if (reload_in_progress
&& MEM_P (x
)
3313 && (inner
= find_replacement (&XEXP (x
, 0))) != XEXP (x
, 0))
3314 x
= replace_equiv_address_nv (x
, inner
);
3315 if (reload_in_progress
&& MEM_P (y
)
3316 && (inner
= find_replacement (&XEXP (y
, 0))) != XEXP (y
, 0))
3317 y
= replace_equiv_address_nv (y
, inner
);
3321 need_clobber
= false;
3323 i
< (GET_MODE_SIZE (mode
) + (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
;
3326 rtx xpart
= operand_subword (x
, i
, 1, mode
);
3329 /* Do not generate code for a move if it would come entirely
3330 from the undefined bits of a paradoxical subreg. */
3331 if (undefined_operand_subword_p (y
, i
))
3334 ypart
= operand_subword (y
, i
, 1, mode
);
3336 /* If we can't get a part of Y, put Y into memory if it is a
3337 constant. Otherwise, force it into a register. Then we must
3338 be able to get a part of Y. */
3339 if (ypart
== 0 && CONSTANT_P (y
))
3341 y
= use_anchored_address (force_const_mem (mode
, y
));
3342 ypart
= operand_subword (y
, i
, 1, mode
);
3344 else if (ypart
== 0)
3345 ypart
= operand_subword_force (y
, i
, mode
);
3347 gcc_assert (xpart
&& ypart
);
3349 need_clobber
|= (GET_CODE (xpart
) == SUBREG
);
3351 last_insn
= emit_move_insn (xpart
, ypart
);
3357 /* Show the output dies here. This is necessary for SUBREGs
3358 of pseudos since we cannot track their lifetimes correctly;
3359 hard regs shouldn't appear here except as return values.
3360 We never want to emit such a clobber after reload. */
3362 && ! (reload_in_progress
|| reload_completed
)
3363 && need_clobber
!= 0)
3371 /* Low level part of emit_move_insn.
3372 Called just like emit_move_insn, but assumes X and Y
3373 are basically valid. */
3376 emit_move_insn_1 (rtx x
, rtx y
)
3378 enum machine_mode mode
= GET_MODE (x
);
3379 enum insn_code code
;
3381 gcc_assert ((unsigned int) mode
< (unsigned int) MAX_MACHINE_MODE
);
3383 code
= optab_handler (mov_optab
, mode
);
3384 if (code
!= CODE_FOR_nothing
)
3385 return emit_insn (GEN_FCN (code
) (x
, y
));
3387 /* Expand complex moves by moving real part and imag part. */
3388 if (COMPLEX_MODE_P (mode
))
3389 return emit_move_complex (mode
, x
, y
);
3391 if (GET_MODE_CLASS (mode
) == MODE_DECIMAL_FLOAT
3392 || ALL_FIXED_POINT_MODE_P (mode
))
3394 rtx result
= emit_move_via_integer (mode
, x
, y
, true);
3396 /* If we can't find an integer mode, use multi words. */
3400 return emit_move_multi_word (mode
, x
, y
);
3403 if (GET_MODE_CLASS (mode
) == MODE_CC
)
3404 return emit_move_ccmode (mode
, x
, y
);
3406 /* Try using a move pattern for the corresponding integer mode. This is
3407 only safe when simplify_subreg can convert MODE constants into integer
3408 constants. At present, it can only do this reliably if the value
3409 fits within a HOST_WIDE_INT. */
3410 if (!CONSTANT_P (y
) || GET_MODE_BITSIZE (mode
) <= HOST_BITS_PER_WIDE_INT
)
3412 rtx ret
= emit_move_via_integer (mode
, x
, y
, false);
3417 return emit_move_multi_word (mode
, x
, y
);
3420 /* Generate code to copy Y into X.
3421 Both Y and X must have the same mode, except that
3422 Y can be a constant with VOIDmode.
3423 This mode cannot be BLKmode; use emit_block_move for that.
3425 Return the last instruction emitted. */
3428 emit_move_insn (rtx x
, rtx y
)
3430 enum machine_mode mode
= GET_MODE (x
);
3431 rtx y_cst
= NULL_RTX
;
3434 gcc_assert (mode
!= BLKmode
3435 && (GET_MODE (y
) == mode
|| GET_MODE (y
) == VOIDmode
));
3440 && SCALAR_FLOAT_MODE_P (GET_MODE (x
))
3441 && (last_insn
= compress_float_constant (x
, y
)))
3446 if (!targetm
.legitimate_constant_p (mode
, y
))
3448 y
= force_const_mem (mode
, y
);
3450 /* If the target's cannot_force_const_mem prevented the spill,
3451 assume that the target's move expanders will also take care
3452 of the non-legitimate constant. */
3456 y
= use_anchored_address (y
);
3460 /* If X or Y are memory references, verify that their addresses are valid
3463 && (! memory_address_addr_space_p (GET_MODE (x
), XEXP (x
, 0),
3465 && ! push_operand (x
, GET_MODE (x
))))
3466 x
= validize_mem (x
);
3469 && ! memory_address_addr_space_p (GET_MODE (y
), XEXP (y
, 0),
3470 MEM_ADDR_SPACE (y
)))
3471 y
= validize_mem (y
);
3473 gcc_assert (mode
!= BLKmode
);
3475 last_insn
= emit_move_insn_1 (x
, y
);
3477 if (y_cst
&& REG_P (x
)
3478 && (set
= single_set (last_insn
)) != NULL_RTX
3479 && SET_DEST (set
) == x
3480 && ! rtx_equal_p (y_cst
, SET_SRC (set
)))
3481 set_unique_reg_note (last_insn
, REG_EQUAL
, copy_rtx (y_cst
));
3486 /* If Y is representable exactly in a narrower mode, and the target can
3487 perform the extension directly from constant or memory, then emit the
3488 move as an extension. */
3491 compress_float_constant (rtx x
, rtx y
)
3493 enum machine_mode dstmode
= GET_MODE (x
);
3494 enum machine_mode orig_srcmode
= GET_MODE (y
);
3495 enum machine_mode srcmode
;
3497 int oldcost
, newcost
;
3498 bool speed
= optimize_insn_for_speed_p ();
3500 REAL_VALUE_FROM_CONST_DOUBLE (r
, y
);
3502 if (targetm
.legitimate_constant_p (dstmode
, y
))
3503 oldcost
= set_src_cost (y
, speed
);
3505 oldcost
= set_src_cost (force_const_mem (dstmode
, y
), speed
);
3507 for (srcmode
= GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_srcmode
));
3508 srcmode
!= orig_srcmode
;
3509 srcmode
= GET_MODE_WIDER_MODE (srcmode
))
3512 rtx trunc_y
, last_insn
;
3514 /* Skip if the target can't extend this way. */
3515 ic
= can_extend_p (dstmode
, srcmode
, 0);
3516 if (ic
== CODE_FOR_nothing
)
3519 /* Skip if the narrowed value isn't exact. */
3520 if (! exact_real_truncate (srcmode
, &r
))
3523 trunc_y
= CONST_DOUBLE_FROM_REAL_VALUE (r
, srcmode
);
3525 if (targetm
.legitimate_constant_p (srcmode
, trunc_y
))
3527 /* Skip if the target needs extra instructions to perform
3529 if (!insn_operand_matches (ic
, 1, trunc_y
))
3531 /* This is valid, but may not be cheaper than the original. */
3532 newcost
= set_src_cost (gen_rtx_FLOAT_EXTEND (dstmode
, trunc_y
),
3534 if (oldcost
< newcost
)
3537 else if (float_extend_from_mem
[dstmode
][srcmode
])
3539 trunc_y
= force_const_mem (srcmode
, trunc_y
);
3540 /* This is valid, but may not be cheaper than the original. */
3541 newcost
= set_src_cost (gen_rtx_FLOAT_EXTEND (dstmode
, trunc_y
),
3543 if (oldcost
< newcost
)
3545 trunc_y
= validize_mem (trunc_y
);
3550 /* For CSE's benefit, force the compressed constant pool entry
3551 into a new pseudo. This constant may be used in different modes,
3552 and if not, combine will put things back together for us. */
3553 trunc_y
= force_reg (srcmode
, trunc_y
);
3554 emit_unop_insn (ic
, x
, trunc_y
, UNKNOWN
);
3555 last_insn
= get_last_insn ();
3558 set_unique_reg_note (last_insn
, REG_EQUAL
, y
);
3566 /* Pushing data onto the stack. */
3568 /* Push a block of length SIZE (perhaps variable)
3569 and return an rtx to address the beginning of the block.
3570 The value may be virtual_outgoing_args_rtx.
3572 EXTRA is the number of bytes of padding to push in addition to SIZE.
3573 BELOW nonzero means this padding comes at low addresses;
3574 otherwise, the padding comes at high addresses. */
3577 push_block (rtx size
, int extra
, int below
)
3581 size
= convert_modes (Pmode
, ptr_mode
, size
, 1);
3582 if (CONSTANT_P (size
))
3583 anti_adjust_stack (plus_constant (size
, extra
));
3584 else if (REG_P (size
) && extra
== 0)
3585 anti_adjust_stack (size
);
3588 temp
= copy_to_mode_reg (Pmode
, size
);
3590 temp
= expand_binop (Pmode
, add_optab
, temp
, GEN_INT (extra
),
3591 temp
, 0, OPTAB_LIB_WIDEN
);
3592 anti_adjust_stack (temp
);
3595 #ifndef STACK_GROWS_DOWNWARD
3601 temp
= virtual_outgoing_args_rtx
;
3602 if (extra
!= 0 && below
)
3603 temp
= plus_constant (temp
, extra
);
3607 if (CONST_INT_P (size
))
3608 temp
= plus_constant (virtual_outgoing_args_rtx
,
3609 -INTVAL (size
) - (below
? 0 : extra
));
3610 else if (extra
!= 0 && !below
)
3611 temp
= gen_rtx_PLUS (Pmode
, virtual_outgoing_args_rtx
,
3612 negate_rtx (Pmode
, plus_constant (size
, extra
)));
3614 temp
= gen_rtx_PLUS (Pmode
, virtual_outgoing_args_rtx
,
3615 negate_rtx (Pmode
, size
));
3618 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT
), temp
);
3621 /* A utility routine that returns the base of an auto-inc memory, or NULL. */
3624 mem_autoinc_base (rtx mem
)
3628 rtx addr
= XEXP (mem
, 0);
3629 if (GET_RTX_CLASS (GET_CODE (addr
)) == RTX_AUTOINC
)
3630 return XEXP (addr
, 0);
3635 /* A utility routine used here, in reload, and in try_split. The insns
3636 after PREV up to and including LAST are known to adjust the stack,
3637 with a final value of END_ARGS_SIZE. Iterate backward from LAST
3638 placing notes as appropriate. PREV may be NULL, indicating the
3639 entire insn sequence prior to LAST should be scanned.
3641 The set of allowed stack pointer modifications is small:
3642 (1) One or more auto-inc style memory references (aka pushes),
3643 (2) One or more addition/subtraction with the SP as destination,
3644 (3) A single move insn with the SP as destination,
3645 (4) A call_pop insn,
3646 (5) Noreturn call insns if !ACCUMULATE_OUTGOING_ARGS.
3648 Insns in the sequence that do not modify the SP are ignored,
3649 except for noreturn calls.
3651 The return value is the amount of adjustment that can be trivially
3652 verified, via immediate operand or auto-inc. If the adjustment
3653 cannot be trivially extracted, the return value is INT_MIN. */
3656 find_args_size_adjust (rtx insn
)
3661 pat
= PATTERN (insn
);
3664 /* Look for a call_pop pattern. */
3667 /* We have to allow non-call_pop patterns for the case
3668 of emit_single_push_insn of a TLS address. */
3669 if (GET_CODE (pat
) != PARALLEL
)
3672 /* All call_pop have a stack pointer adjust in the parallel.
3673 The call itself is always first, and the stack adjust is
3674 usually last, so search from the end. */
3675 for (i
= XVECLEN (pat
, 0) - 1; i
> 0; --i
)
3677 set
= XVECEXP (pat
, 0, i
);
3678 if (GET_CODE (set
) != SET
)
3680 dest
= SET_DEST (set
);
3681 if (dest
== stack_pointer_rtx
)
3684 /* We'd better have found the stack pointer adjust. */
3687 /* Fall through to process the extracted SET and DEST
3688 as if it was a standalone insn. */
3690 else if (GET_CODE (pat
) == SET
)
3692 else if ((set
= single_set (insn
)) != NULL
)
3694 else if (GET_CODE (pat
) == PARALLEL
)
3696 /* ??? Some older ports use a parallel with a stack adjust
3697 and a store for a PUSH_ROUNDING pattern, rather than a
3698 PRE/POST_MODIFY rtx. Don't force them to update yet... */
3699 /* ??? See h8300 and m68k, pushqi1. */
3700 for (i
= XVECLEN (pat
, 0) - 1; i
>= 0; --i
)
3702 set
= XVECEXP (pat
, 0, i
);
3703 if (GET_CODE (set
) != SET
)
3705 dest
= SET_DEST (set
);
3706 if (dest
== stack_pointer_rtx
)
3709 /* We do not expect an auto-inc of the sp in the parallel. */
3710 gcc_checking_assert (mem_autoinc_base (dest
) != stack_pointer_rtx
);
3711 gcc_checking_assert (mem_autoinc_base (SET_SRC (set
))
3712 != stack_pointer_rtx
);
3720 dest
= SET_DEST (set
);
3722 /* Look for direct modifications of the stack pointer. */
3723 if (REG_P (dest
) && REGNO (dest
) == STACK_POINTER_REGNUM
)
3725 /* Look for a trivial adjustment, otherwise assume nothing. */
3726 /* Note that the SPU restore_stack_block pattern refers to
3727 the stack pointer in V4SImode. Consider that non-trivial. */
3728 if (SCALAR_INT_MODE_P (GET_MODE (dest
))
3729 && GET_CODE (SET_SRC (set
)) == PLUS
3730 && XEXP (SET_SRC (set
), 0) == stack_pointer_rtx
3731 && CONST_INT_P (XEXP (SET_SRC (set
), 1)))
3732 return INTVAL (XEXP (SET_SRC (set
), 1));
3733 /* ??? Reload can generate no-op moves, which will be cleaned
3734 up later. Recognize it and continue searching. */
3735 else if (rtx_equal_p (dest
, SET_SRC (set
)))
3738 return HOST_WIDE_INT_MIN
;
3744 /* Otherwise only think about autoinc patterns. */
3745 if (mem_autoinc_base (dest
) == stack_pointer_rtx
)
3748 gcc_checking_assert (mem_autoinc_base (SET_SRC (set
))
3749 != stack_pointer_rtx
);
3751 else if (mem_autoinc_base (SET_SRC (set
)) == stack_pointer_rtx
)
3752 mem
= SET_SRC (set
);
3756 addr
= XEXP (mem
, 0);
3757 switch (GET_CODE (addr
))
3761 return GET_MODE_SIZE (GET_MODE (mem
));
3764 return -GET_MODE_SIZE (GET_MODE (mem
));
3767 addr
= XEXP (addr
, 1);
3768 gcc_assert (GET_CODE (addr
) == PLUS
);
3769 gcc_assert (XEXP (addr
, 0) == stack_pointer_rtx
);
3770 gcc_assert (CONST_INT_P (XEXP (addr
, 1)));
3771 return INTVAL (XEXP (addr
, 1));
3779 fixup_args_size_notes (rtx prev
, rtx last
, int end_args_size
)
3781 int args_size
= end_args_size
;
3782 bool saw_unknown
= false;
3785 for (insn
= last
; insn
!= prev
; insn
= PREV_INSN (insn
))
3787 HOST_WIDE_INT this_delta
;
3789 if (!NONDEBUG_INSN_P (insn
))
3792 this_delta
= find_args_size_adjust (insn
);
3793 if (this_delta
== 0)
3796 || ACCUMULATE_OUTGOING_ARGS
3797 || find_reg_note (insn
, REG_NORETURN
, NULL_RTX
) == NULL_RTX
)
3801 gcc_assert (!saw_unknown
);
3802 if (this_delta
== HOST_WIDE_INT_MIN
)
3805 add_reg_note (insn
, REG_ARGS_SIZE
, GEN_INT (args_size
));
3806 #ifdef STACK_GROWS_DOWNWARD
3807 this_delta
= -this_delta
;
3809 args_size
-= this_delta
;
3812 return saw_unknown
? INT_MIN
: args_size
;
3815 #ifdef PUSH_ROUNDING
3816 /* Emit single push insn. */
3819 emit_single_push_insn_1 (enum machine_mode mode
, rtx x
, tree type
)
3822 unsigned rounded_size
= PUSH_ROUNDING (GET_MODE_SIZE (mode
));
3824 enum insn_code icode
;
3826 stack_pointer_delta
+= PUSH_ROUNDING (GET_MODE_SIZE (mode
));
3827 /* If there is push pattern, use it. Otherwise try old way of throwing
3828 MEM representing push operation to move expander. */
3829 icode
= optab_handler (push_optab
, mode
);
3830 if (icode
!= CODE_FOR_nothing
)
3832 struct expand_operand ops
[1];
3834 create_input_operand (&ops
[0], x
, mode
);
3835 if (maybe_expand_insn (icode
, 1, ops
))
3838 if (GET_MODE_SIZE (mode
) == rounded_size
)
3839 dest_addr
= gen_rtx_fmt_e (STACK_PUSH_CODE
, Pmode
, stack_pointer_rtx
);
3840 /* If we are to pad downward, adjust the stack pointer first and
3841 then store X into the stack location using an offset. This is
3842 because emit_move_insn does not know how to pad; it does not have
3844 else if (FUNCTION_ARG_PADDING (mode
, type
) == downward
)
3846 unsigned padding_size
= rounded_size
- GET_MODE_SIZE (mode
);
3847 HOST_WIDE_INT offset
;
3849 emit_move_insn (stack_pointer_rtx
,
3850 expand_binop (Pmode
,
3851 #ifdef STACK_GROWS_DOWNWARD
3857 GEN_INT (rounded_size
),
3858 NULL_RTX
, 0, OPTAB_LIB_WIDEN
));
3860 offset
= (HOST_WIDE_INT
) padding_size
;
3861 #ifdef STACK_GROWS_DOWNWARD
3862 if (STACK_PUSH_CODE
== POST_DEC
)
3863 /* We have already decremented the stack pointer, so get the
3865 offset
+= (HOST_WIDE_INT
) rounded_size
;
3867 if (STACK_PUSH_CODE
== POST_INC
)
3868 /* We have already incremented the stack pointer, so get the
3870 offset
-= (HOST_WIDE_INT
) rounded_size
;
3872 dest_addr
= gen_rtx_PLUS (Pmode
, stack_pointer_rtx
, GEN_INT (offset
));
3876 #ifdef STACK_GROWS_DOWNWARD
3877 /* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC. */
3878 dest_addr
= gen_rtx_PLUS (Pmode
, stack_pointer_rtx
,
3879 GEN_INT (-(HOST_WIDE_INT
) rounded_size
));
3881 /* ??? This seems wrong if STACK_PUSH_CODE == POST_INC. */
3882 dest_addr
= gen_rtx_PLUS (Pmode
, stack_pointer_rtx
,
3883 GEN_INT (rounded_size
));
3885 dest_addr
= gen_rtx_PRE_MODIFY (Pmode
, stack_pointer_rtx
, dest_addr
);
3888 dest
= gen_rtx_MEM (mode
, dest_addr
);
3892 set_mem_attributes (dest
, type
, 1);
3894 if (flag_optimize_sibling_calls
)
3895 /* Function incoming arguments may overlap with sibling call
3896 outgoing arguments and we cannot allow reordering of reads
3897 from function arguments with stores to outgoing arguments
3898 of sibling calls. */
3899 set_mem_alias_set (dest
, 0);
3901 emit_move_insn (dest
, x
);
3904 /* Emit and annotate a single push insn. */
3907 emit_single_push_insn (enum machine_mode mode
, rtx x
, tree type
)
3909 int delta
, old_delta
= stack_pointer_delta
;
3910 rtx prev
= get_last_insn ();
3913 emit_single_push_insn_1 (mode
, x
, type
);
3915 last
= get_last_insn ();
3917 /* Notice the common case where we emitted exactly one insn. */
3918 if (PREV_INSN (last
) == prev
)
3920 add_reg_note (last
, REG_ARGS_SIZE
, GEN_INT (stack_pointer_delta
));
3924 delta
= fixup_args_size_notes (prev
, last
, stack_pointer_delta
);
3925 gcc_assert (delta
== INT_MIN
|| delta
== old_delta
);
3929 /* Generate code to push X onto the stack, assuming it has mode MODE and
3931 MODE is redundant except when X is a CONST_INT (since they don't
3933 SIZE is an rtx for the size of data to be copied (in bytes),
3934 needed only if X is BLKmode.
3936 ALIGN (in bits) is maximum alignment we can assume.
3938 If PARTIAL and REG are both nonzero, then copy that many of the first
3939 bytes of X into registers starting with REG, and push the rest of X.
3940 The amount of space pushed is decreased by PARTIAL bytes.
3941 REG must be a hard register in this case.
3942 If REG is zero but PARTIAL is not, take any all others actions for an
3943 argument partially in registers, but do not actually load any
3946 EXTRA is the amount in bytes of extra space to leave next to this arg.
3947 This is ignored if an argument block has already been allocated.
3949 On a machine that lacks real push insns, ARGS_ADDR is the address of
3950 the bottom of the argument block for this call. We use indexing off there
3951 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
3952 argument block has not been preallocated.
3954 ARGS_SO_FAR is the size of args previously pushed for this call.
3956 REG_PARM_STACK_SPACE is nonzero if functions require stack space
3957 for arguments passed in registers. If nonzero, it will be the number
3958 of bytes required. */
3961 emit_push_insn (rtx x
, enum machine_mode mode
, tree type
, rtx size
,
3962 unsigned int align
, int partial
, rtx reg
, int extra
,
3963 rtx args_addr
, rtx args_so_far
, int reg_parm_stack_space
,
3967 enum direction stack_direction
3968 #ifdef STACK_GROWS_DOWNWARD
3974 /* Decide where to pad the argument: `downward' for below,
3975 `upward' for above, or `none' for don't pad it.
3976 Default is below for small data on big-endian machines; else above. */
3977 enum direction where_pad
= FUNCTION_ARG_PADDING (mode
, type
);
3979 /* Invert direction if stack is post-decrement.
3981 if (STACK_PUSH_CODE
== POST_DEC
)
3982 if (where_pad
!= none
)
3983 where_pad
= (where_pad
== downward
? upward
: downward
);
3988 || (STRICT_ALIGNMENT
&& align
< GET_MODE_ALIGNMENT (mode
)))
3990 /* Copy a block into the stack, entirely or partially. */
3997 offset
= partial
% (PARM_BOUNDARY
/ BITS_PER_UNIT
);
3998 used
= partial
- offset
;
4000 if (mode
!= BLKmode
)
4002 /* A value is to be stored in an insufficiently aligned
4003 stack slot; copy via a suitably aligned slot if
4005 size
= GEN_INT (GET_MODE_SIZE (mode
));
4006 if (!MEM_P (xinner
))
4008 temp
= assign_temp (type
, 0, 1, 1);
4009 emit_move_insn (temp
, xinner
);
4016 /* USED is now the # of bytes we need not copy to the stack
4017 because registers will take care of them. */
4020 xinner
= adjust_address (xinner
, BLKmode
, used
);
4022 /* If the partial register-part of the arg counts in its stack size,
4023 skip the part of stack space corresponding to the registers.
4024 Otherwise, start copying to the beginning of the stack space,
4025 by setting SKIP to 0. */
4026 skip
= (reg_parm_stack_space
== 0) ? 0 : used
;
4028 #ifdef PUSH_ROUNDING
4029 /* Do it with several push insns if that doesn't take lots of insns
4030 and if there is no difficulty with push insns that skip bytes
4031 on the stack for alignment purposes. */
4034 && CONST_INT_P (size
)
4036 && MEM_ALIGN (xinner
) >= align
4037 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size
) - used
, align
))
4038 /* Here we avoid the case of a structure whose weak alignment
4039 forces many pushes of a small amount of data,
4040 and such small pushes do rounding that causes trouble. */
4041 && ((! SLOW_UNALIGNED_ACCESS (word_mode
, align
))
4042 || align
>= BIGGEST_ALIGNMENT
4043 || (PUSH_ROUNDING (align
/ BITS_PER_UNIT
)
4044 == (align
/ BITS_PER_UNIT
)))
4045 && (HOST_WIDE_INT
) PUSH_ROUNDING (INTVAL (size
)) == INTVAL (size
))
4047 /* Push padding now if padding above and stack grows down,
4048 or if padding below and stack grows up.
4049 But if space already allocated, this has already been done. */
4050 if (extra
&& args_addr
== 0
4051 && where_pad
!= none
&& where_pad
!= stack_direction
)
4052 anti_adjust_stack (GEN_INT (extra
));
4054 move_by_pieces (NULL
, xinner
, INTVAL (size
) - used
, align
, 0);
4057 #endif /* PUSH_ROUNDING */
4061 /* Otherwise make space on the stack and copy the data
4062 to the address of that space. */
4064 /* Deduct words put into registers from the size we must copy. */
4067 if (CONST_INT_P (size
))
4068 size
= GEN_INT (INTVAL (size
) - used
);
4070 size
= expand_binop (GET_MODE (size
), sub_optab
, size
,
4071 GEN_INT (used
), NULL_RTX
, 0,
4075 /* Get the address of the stack space.
4076 In this case, we do not deal with EXTRA separately.
4077 A single stack adjust will do. */
4080 temp
= push_block (size
, extra
, where_pad
== downward
);
4083 else if (CONST_INT_P (args_so_far
))
4084 temp
= memory_address (BLKmode
,
4085 plus_constant (args_addr
,
4086 skip
+ INTVAL (args_so_far
)));
4088 temp
= memory_address (BLKmode
,
4089 plus_constant (gen_rtx_PLUS (Pmode
,
4094 if (!ACCUMULATE_OUTGOING_ARGS
)
4096 /* If the source is referenced relative to the stack pointer,
4097 copy it to another register to stabilize it. We do not need
4098 to do this if we know that we won't be changing sp. */
4100 if (reg_mentioned_p (virtual_stack_dynamic_rtx
, temp
)
4101 || reg_mentioned_p (virtual_outgoing_args_rtx
, temp
))
4102 temp
= copy_to_reg (temp
);
4105 target
= gen_rtx_MEM (BLKmode
, temp
);
4107 /* We do *not* set_mem_attributes here, because incoming arguments
4108 may overlap with sibling call outgoing arguments and we cannot
4109 allow reordering of reads from function arguments with stores
4110 to outgoing arguments of sibling calls. We do, however, want
4111 to record the alignment of the stack slot. */
4112 /* ALIGN may well be better aligned than TYPE, e.g. due to
4113 PARM_BOUNDARY. Assume the caller isn't lying. */
4114 set_mem_align (target
, align
);
4116 emit_block_move (target
, xinner
, size
, BLOCK_OP_CALL_PARM
);
4119 else if (partial
> 0)
4121 /* Scalar partly in registers. */
4123 int size
= GET_MODE_SIZE (mode
) / UNITS_PER_WORD
;
4126 /* # bytes of start of argument
4127 that we must make space for but need not store. */
4128 int offset
= partial
% (PARM_BOUNDARY
/ BITS_PER_UNIT
);
4129 int args_offset
= INTVAL (args_so_far
);
4132 /* Push padding now if padding above and stack grows down,
4133 or if padding below and stack grows up.
4134 But if space already allocated, this has already been done. */
4135 if (extra
&& args_addr
== 0
4136 && where_pad
!= none
&& where_pad
!= stack_direction
)
4137 anti_adjust_stack (GEN_INT (extra
));
4139 /* If we make space by pushing it, we might as well push
4140 the real data. Otherwise, we can leave OFFSET nonzero
4141 and leave the space uninitialized. */
4145 /* Now NOT_STACK gets the number of words that we don't need to
4146 allocate on the stack. Convert OFFSET to words too. */
4147 not_stack
= (partial
- offset
) / UNITS_PER_WORD
;
4148 offset
/= UNITS_PER_WORD
;
4150 /* If the partial register-part of the arg counts in its stack size,
4151 skip the part of stack space corresponding to the registers.
4152 Otherwise, start copying to the beginning of the stack space,
4153 by setting SKIP to 0. */
4154 skip
= (reg_parm_stack_space
== 0) ? 0 : not_stack
;
4156 if (CONSTANT_P (x
) && !targetm
.legitimate_constant_p (mode
, x
))
4157 x
= validize_mem (force_const_mem (mode
, x
));
4159 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
4160 SUBREGs of such registers are not allowed. */
4161 if ((REG_P (x
) && REGNO (x
) < FIRST_PSEUDO_REGISTER
4162 && GET_MODE_CLASS (GET_MODE (x
)) != MODE_INT
))
4163 x
= copy_to_reg (x
);
4165 /* Loop over all the words allocated on the stack for this arg. */
4166 /* We can do it by words, because any scalar bigger than a word
4167 has a size a multiple of a word. */
4168 #ifndef PUSH_ARGS_REVERSED
4169 for (i
= not_stack
; i
< size
; i
++)
4171 for (i
= size
- 1; i
>= not_stack
; i
--)
4173 if (i
>= not_stack
+ offset
)
4174 emit_push_insn (operand_subword_force (x
, i
, mode
),
4175 word_mode
, NULL_TREE
, NULL_RTX
, align
, 0, NULL_RTX
,
4177 GEN_INT (args_offset
+ ((i
- not_stack
+ skip
)
4179 reg_parm_stack_space
, alignment_pad
);
4186 /* Push padding now if padding above and stack grows down,
4187 or if padding below and stack grows up.
4188 But if space already allocated, this has already been done. */
4189 if (extra
&& args_addr
== 0
4190 && where_pad
!= none
&& where_pad
!= stack_direction
)
4191 anti_adjust_stack (GEN_INT (extra
));
4193 #ifdef PUSH_ROUNDING
4194 if (args_addr
== 0 && PUSH_ARGS
)
4195 emit_single_push_insn (mode
, x
, type
);
4199 if (CONST_INT_P (args_so_far
))
4201 = memory_address (mode
,
4202 plus_constant (args_addr
,
4203 INTVAL (args_so_far
)));
4205 addr
= memory_address (mode
, gen_rtx_PLUS (Pmode
, args_addr
,
4207 dest
= gen_rtx_MEM (mode
, addr
);
4209 /* We do *not* set_mem_attributes here, because incoming arguments
4210 may overlap with sibling call outgoing arguments and we cannot
4211 allow reordering of reads from function arguments with stores
4212 to outgoing arguments of sibling calls. We do, however, want
4213 to record the alignment of the stack slot. */
4214 /* ALIGN may well be better aligned than TYPE, e.g. due to
4215 PARM_BOUNDARY. Assume the caller isn't lying. */
4216 set_mem_align (dest
, align
);
4218 emit_move_insn (dest
, x
);
4222 /* If part should go in registers, copy that part
4223 into the appropriate registers. Do this now, at the end,
4224 since mem-to-mem copies above may do function calls. */
4225 if (partial
> 0 && reg
!= 0)
4227 /* Handle calls that pass values in multiple non-contiguous locations.
4228 The Irix 6 ABI has examples of this. */
4229 if (GET_CODE (reg
) == PARALLEL
)
4230 emit_group_load (reg
, x
, type
, -1);
4233 gcc_assert (partial
% UNITS_PER_WORD
== 0);
4234 move_block_to_reg (REGNO (reg
), x
, partial
/ UNITS_PER_WORD
, mode
);
4238 if (extra
&& args_addr
== 0 && where_pad
== stack_direction
)
4239 anti_adjust_stack (GEN_INT (extra
));
4241 if (alignment_pad
&& args_addr
== 0)
4242 anti_adjust_stack (alignment_pad
);
4245 /* Return X if X can be used as a subtarget in a sequence of arithmetic
4249 get_subtarget (rtx x
)
4253 /* Only registers can be subtargets. */
4255 /* Don't use hard regs to avoid extending their life. */
4256 || REGNO (x
) < FIRST_PSEUDO_REGISTER
4260 /* A subroutine of expand_assignment. Optimize FIELD op= VAL, where
4261 FIELD is a bitfield. Returns true if the optimization was successful,
4262 and there's nothing else to do. */
4265 optimize_bitfield_assignment_op (unsigned HOST_WIDE_INT bitsize
,
4266 unsigned HOST_WIDE_INT bitpos
,
4267 unsigned HOST_WIDE_INT bitregion_start
,
4268 unsigned HOST_WIDE_INT bitregion_end
,
4269 enum machine_mode mode1
, rtx str_rtx
,
4272 enum machine_mode str_mode
= GET_MODE (str_rtx
);
4273 unsigned int str_bitsize
= GET_MODE_BITSIZE (str_mode
);
4278 enum tree_code code
;
4280 if (mode1
!= VOIDmode
4281 || bitsize
>= BITS_PER_WORD
4282 || str_bitsize
> BITS_PER_WORD
4283 || TREE_SIDE_EFFECTS (to
)
4284 || TREE_THIS_VOLATILE (to
))
4288 if (TREE_CODE (src
) != SSA_NAME
)
4290 if (TREE_CODE (TREE_TYPE (src
)) != INTEGER_TYPE
)
4293 srcstmt
= get_gimple_for_ssa_name (src
);
4295 || TREE_CODE_CLASS (gimple_assign_rhs_code (srcstmt
)) != tcc_binary
)
4298 code
= gimple_assign_rhs_code (srcstmt
);
4300 op0
= gimple_assign_rhs1 (srcstmt
);
4302 /* If OP0 is an SSA_NAME, then we want to walk the use-def chain
4303 to find its initialization. Hopefully the initialization will
4304 be from a bitfield load. */
4305 if (TREE_CODE (op0
) == SSA_NAME
)
4307 gimple op0stmt
= get_gimple_for_ssa_name (op0
);
4309 /* We want to eventually have OP0 be the same as TO, which
4310 should be a bitfield. */
4312 || !is_gimple_assign (op0stmt
)
4313 || gimple_assign_rhs_code (op0stmt
) != TREE_CODE (to
))
4315 op0
= gimple_assign_rhs1 (op0stmt
);
4318 op1
= gimple_assign_rhs2 (srcstmt
);
4320 if (!operand_equal_p (to
, op0
, 0))
4323 if (MEM_P (str_rtx
))
4325 unsigned HOST_WIDE_INT offset1
;
4327 if (str_bitsize
== 0 || str_bitsize
> BITS_PER_WORD
)
4328 str_mode
= word_mode
;
4329 str_mode
= get_best_mode (bitsize
, bitpos
,
4330 bitregion_start
, bitregion_end
,
4331 MEM_ALIGN (str_rtx
), str_mode
, 0);
4332 if (str_mode
== VOIDmode
)
4334 str_bitsize
= GET_MODE_BITSIZE (str_mode
);
4337 bitpos
%= str_bitsize
;
4338 offset1
= (offset1
- bitpos
) / BITS_PER_UNIT
;
4339 str_rtx
= adjust_address (str_rtx
, str_mode
, offset1
);
4341 else if (!REG_P (str_rtx
) && GET_CODE (str_rtx
) != SUBREG
)
4344 /* If the bit field covers the whole REG/MEM, store_field
4345 will likely generate better code. */
4346 if (bitsize
>= str_bitsize
)
4349 /* We can't handle fields split across multiple entities. */
4350 if (bitpos
+ bitsize
> str_bitsize
)
4353 if (BYTES_BIG_ENDIAN
)
4354 bitpos
= str_bitsize
- bitpos
- bitsize
;
4360 /* For now, just optimize the case of the topmost bitfield
4361 where we don't need to do any masking and also
4362 1 bit bitfields where xor can be used.
4363 We might win by one instruction for the other bitfields
4364 too if insv/extv instructions aren't used, so that
4365 can be added later. */
4366 if (bitpos
+ bitsize
!= str_bitsize
4367 && (bitsize
!= 1 || TREE_CODE (op1
) != INTEGER_CST
))
4370 value
= expand_expr (op1
, NULL_RTX
, str_mode
, EXPAND_NORMAL
);
4371 value
= convert_modes (str_mode
,
4372 TYPE_MODE (TREE_TYPE (op1
)), value
,
4373 TYPE_UNSIGNED (TREE_TYPE (op1
)));
4375 /* We may be accessing data outside the field, which means
4376 we can alias adjacent data. */
4377 if (MEM_P (str_rtx
))
4379 str_rtx
= shallow_copy_rtx (str_rtx
);
4380 set_mem_alias_set (str_rtx
, 0);
4381 set_mem_expr (str_rtx
, 0);
4384 binop
= code
== PLUS_EXPR
? add_optab
: sub_optab
;
4385 if (bitsize
== 1 && bitpos
+ bitsize
!= str_bitsize
)
4387 value
= expand_and (str_mode
, value
, const1_rtx
, NULL
);
4390 value
= expand_shift (LSHIFT_EXPR
, str_mode
, value
,
4391 bitpos
, NULL_RTX
, 1);
4392 result
= expand_binop (str_mode
, binop
, str_rtx
,
4393 value
, str_rtx
, 1, OPTAB_WIDEN
);
4394 if (result
!= str_rtx
)
4395 emit_move_insn (str_rtx
, result
);
4400 if (TREE_CODE (op1
) != INTEGER_CST
)
4402 value
= expand_expr (op1
, NULL_RTX
, GET_MODE (str_rtx
), EXPAND_NORMAL
);
4403 value
= convert_modes (GET_MODE (str_rtx
),
4404 TYPE_MODE (TREE_TYPE (op1
)), value
,
4405 TYPE_UNSIGNED (TREE_TYPE (op1
)));
4407 /* We may be accessing data outside the field, which means
4408 we can alias adjacent data. */
4409 if (MEM_P (str_rtx
))
4411 str_rtx
= shallow_copy_rtx (str_rtx
);
4412 set_mem_alias_set (str_rtx
, 0);
4413 set_mem_expr (str_rtx
, 0);
4416 binop
= code
== BIT_IOR_EXPR
? ior_optab
: xor_optab
;
4417 if (bitpos
+ bitsize
!= GET_MODE_BITSIZE (GET_MODE (str_rtx
)))
4419 rtx mask
= GEN_INT (((unsigned HOST_WIDE_INT
) 1 << bitsize
)
4421 value
= expand_and (GET_MODE (str_rtx
), value
, mask
,
4424 value
= expand_shift (LSHIFT_EXPR
, GET_MODE (str_rtx
), value
,
4425 bitpos
, NULL_RTX
, 1);
4426 result
= expand_binop (GET_MODE (str_rtx
), binop
, str_rtx
,
4427 value
, str_rtx
, 1, OPTAB_WIDEN
);
4428 if (result
!= str_rtx
)
4429 emit_move_insn (str_rtx
, result
);
4439 /* In the C++ memory model, consecutive bit fields in a structure are
4440 considered one memory location.
4442 Given a COMPONENT_REF, this function returns the bit range of
4443 consecutive bits in which this COMPONENT_REF belongs in. The
4444 values are returned in *BITSTART and *BITEND. If either the C++
4445 memory model is not activated, or this memory access is not thread
4446 visible, 0 is returned in *BITSTART and *BITEND.
4448 EXP is the COMPONENT_REF.
4449 INNERDECL is the actual object being referenced.
4450 BITPOS is the position in bits where the bit starts within the structure.
4451 BITSIZE is size in bits of the field being referenced in EXP.
4453 For example, while storing into FOO.A here...
4464 ...we are not allowed to store past <b>, so for the layout above, a
4465 range of 0..7 (because no one cares if we store into the
4469 get_bit_range (unsigned HOST_WIDE_INT
*bitstart
,
4470 unsigned HOST_WIDE_INT
*bitend
,
4471 tree exp
, tree innerdecl
,
4472 HOST_WIDE_INT bitpos
, HOST_WIDE_INT bitsize
)
4474 tree field
, record_type
, fld
;
4475 bool found_field
= false;
4476 bool prev_field_is_bitfield
;
4478 gcc_assert (TREE_CODE (exp
) == COMPONENT_REF
);
4480 /* If other threads can't see this value, no need to restrict stores. */
4481 if (ALLOW_STORE_DATA_RACES
4482 || ((TREE_CODE (innerdecl
) == MEM_REF
4483 || TREE_CODE (innerdecl
) == TARGET_MEM_REF
)
4484 && !ptr_deref_may_alias_global_p (TREE_OPERAND (innerdecl
, 0)))
4485 || (DECL_P (innerdecl
)
4486 && ((TREE_CODE (innerdecl
) == VAR_DECL
4487 && DECL_THREAD_LOCAL_P (innerdecl
))
4488 || !TREE_STATIC (innerdecl
))))
4490 *bitstart
= *bitend
= 0;
4494 /* Bit field we're storing into. */
4495 field
= TREE_OPERAND (exp
, 1);
4496 record_type
= DECL_FIELD_CONTEXT (field
);
4498 /* Count the contiguous bitfields for the memory location that
4501 prev_field_is_bitfield
= true;
4502 for (fld
= TYPE_FIELDS (record_type
); fld
; fld
= DECL_CHAIN (fld
))
4505 enum machine_mode mode
;
4506 int unsignedp
, volatilep
;
4508 if (TREE_CODE (fld
) != FIELD_DECL
)
4511 t
= build3 (COMPONENT_REF
, TREE_TYPE (exp
),
4512 unshare_expr (TREE_OPERAND (exp
, 0)),
4514 get_inner_reference (t
, &bitsize
, &bitpos
, &offset
,
4515 &mode
, &unsignedp
, &volatilep
, true);
4520 if (DECL_BIT_FIELD_TYPE (fld
) && bitsize
> 0)
4522 if (prev_field_is_bitfield
== false)
4525 prev_field_is_bitfield
= true;
4530 prev_field_is_bitfield
= false;
4535 gcc_assert (found_field
);
4539 /* We found the end of the bit field sequence. Include the
4540 padding up to the next field and be done. */
4541 *bitend
= bitpos
- 1;
4545 /* If this is the last element in the structure, include the padding
4546 at the end of structure. */
4547 *bitend
= TREE_INT_CST_LOW (TYPE_SIZE (record_type
)) - 1;
4551 /* Returns true if the MEM_REF REF refers to an object that does not
4552 reside in memory and has non-BLKmode. */
4555 mem_ref_refers_to_non_mem_p (tree ref
)
4557 tree base
= TREE_OPERAND (ref
, 0);
4558 if (TREE_CODE (base
) != ADDR_EXPR
)
4560 base
= TREE_OPERAND (base
, 0);
4561 return (DECL_P (base
)
4562 && !TREE_ADDRESSABLE (base
)
4563 && DECL_MODE (base
) != BLKmode
4564 && DECL_RTL_SET_P (base
)
4565 && !MEM_P (DECL_RTL (base
)));
4568 /* Expand an assignment that stores the value of FROM into TO. If NONTEMPORAL
4569 is true, try generating a nontemporal store. */
4572 expand_assignment (tree to
, tree from
, bool nontemporal
)
4576 enum machine_mode mode
;
4578 enum insn_code icode
;
4580 /* Don't crash if the lhs of the assignment was erroneous. */
4581 if (TREE_CODE (to
) == ERROR_MARK
)
4583 expand_normal (from
);
4587 /* Optimize away no-op moves without side-effects. */
4588 if (operand_equal_p (to
, from
, 0))
4591 /* Handle misaligned stores. */
4592 mode
= TYPE_MODE (TREE_TYPE (to
));
4593 if ((TREE_CODE (to
) == MEM_REF
4594 || TREE_CODE (to
) == TARGET_MEM_REF
)
4596 && ((align
= get_object_or_type_alignment (to
))
4597 < GET_MODE_ALIGNMENT (mode
))
4598 && ((icode
= optab_handler (movmisalign_optab
, mode
))
4599 != CODE_FOR_nothing
))
4602 = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (to
, 0))));
4603 struct expand_operand ops
[2];
4604 enum machine_mode address_mode
;
4607 reg
= expand_expr (from
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
);
4608 reg
= force_not_mem (reg
);
4610 if (TREE_CODE (to
) == MEM_REF
)
4612 tree base
= TREE_OPERAND (to
, 0);
4613 address_mode
= targetm
.addr_space
.address_mode (as
);
4614 op0
= expand_expr (base
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
);
4615 op0
= convert_memory_address_addr_space (address_mode
, op0
, as
);
4616 if (!integer_zerop (TREE_OPERAND (to
, 1)))
4619 = immed_double_int_const (mem_ref_offset (to
), address_mode
);
4620 op0
= simplify_gen_binary (PLUS
, address_mode
, op0
, off
);
4622 op0
= memory_address_addr_space (mode
, op0
, as
);
4623 mem
= gen_rtx_MEM (mode
, op0
);
4624 set_mem_attributes (mem
, to
, 0);
4625 set_mem_addr_space (mem
, as
);
4627 else if (TREE_CODE (to
) == TARGET_MEM_REF
)
4629 struct mem_address addr
;
4630 get_address_description (to
, &addr
);
4631 op0
= addr_for_mem_ref (&addr
, as
, true);
4632 op0
= memory_address_addr_space (mode
, op0
, as
);
4633 mem
= gen_rtx_MEM (mode
, op0
);
4634 set_mem_attributes (mem
, to
, 0);
4635 set_mem_addr_space (mem
, as
);
4639 if (TREE_THIS_VOLATILE (to
))
4640 MEM_VOLATILE_P (mem
) = 1;
4642 create_fixed_operand (&ops
[0], mem
);
4643 create_input_operand (&ops
[1], reg
, mode
);
4644 /* The movmisalign<mode> pattern cannot fail, else the assignment would
4645 silently be omitted. */
4646 expand_insn (icode
, 2, ops
);
4650 /* Assignment of a structure component needs special treatment
4651 if the structure component's rtx is not simply a MEM.
4652 Assignment of an array element at a constant index, and assignment of
4653 an array element in an unaligned packed structure field, has the same
4654 problem. Same for (partially) storing into a non-memory object. */
4655 if (handled_component_p (to
)
4656 || (TREE_CODE (to
) == MEM_REF
4657 && mem_ref_refers_to_non_mem_p (to
))
4658 || TREE_CODE (TREE_TYPE (to
)) == ARRAY_TYPE
)
4660 enum machine_mode mode1
;
4661 HOST_WIDE_INT bitsize
, bitpos
;
4662 unsigned HOST_WIDE_INT bitregion_start
= 0;
4663 unsigned HOST_WIDE_INT bitregion_end
= 0;
4671 tem
= get_inner_reference (to
, &bitsize
, &bitpos
, &offset
, &mode1
,
4672 &unsignedp
, &volatilep
, true);
4674 if (TREE_CODE (to
) == COMPONENT_REF
4675 && DECL_BIT_FIELD_TYPE (TREE_OPERAND (to
, 1)))
4676 get_bit_range (&bitregion_start
, &bitregion_end
,
4677 to
, tem
, bitpos
, bitsize
);
4679 /* If we are going to use store_bit_field and extract_bit_field,
4680 make sure to_rtx will be safe for multiple use. */
4681 mode
= TYPE_MODE (TREE_TYPE (tem
));
4682 if (TREE_CODE (tem
) == MEM_REF
4684 && ((align
= get_object_or_type_alignment (tem
))
4685 < GET_MODE_ALIGNMENT (mode
))
4686 && ((icode
= optab_handler (movmisalign_optab
, mode
))
4687 != CODE_FOR_nothing
))
4690 to_rtx
= gen_reg_rtx (mode
);
4695 to_rtx
= expand_normal (tem
);
4698 /* If the bitfield is volatile, we want to access it in the
4699 field's mode, not the computed mode.
4700 If a MEM has VOIDmode (external with incomplete type),
4701 use BLKmode for it instead. */
4704 if (volatilep
&& flag_strict_volatile_bitfields
> 0)
4705 to_rtx
= adjust_address (to_rtx
, mode1
, 0);
4706 else if (GET_MODE (to_rtx
) == VOIDmode
)
4707 to_rtx
= adjust_address (to_rtx
, BLKmode
, 0);
4712 enum machine_mode address_mode
;
4715 if (!MEM_P (to_rtx
))
4717 /* We can get constant negative offsets into arrays with broken
4718 user code. Translate this to a trap instead of ICEing. */
4719 gcc_assert (TREE_CODE (offset
) == INTEGER_CST
);
4720 expand_builtin_trap ();
4721 to_rtx
= gen_rtx_MEM (BLKmode
, const0_rtx
);
4724 offset_rtx
= expand_expr (offset
, NULL_RTX
, VOIDmode
, EXPAND_SUM
);
4726 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (to_rtx
));
4727 if (GET_MODE (offset_rtx
) != address_mode
)
4728 offset_rtx
= convert_to_mode (address_mode
, offset_rtx
, 0);
4730 /* A constant address in TO_RTX can have VOIDmode, we must not try
4731 to call force_reg for that case. Avoid that case. */
4733 && GET_MODE (to_rtx
) == BLKmode
4734 && GET_MODE (XEXP (to_rtx
, 0)) != VOIDmode
4736 && (bitpos
% bitsize
) == 0
4737 && (bitsize
% GET_MODE_ALIGNMENT (mode1
)) == 0
4738 && MEM_ALIGN (to_rtx
) == GET_MODE_ALIGNMENT (mode1
))
4740 to_rtx
= adjust_address (to_rtx
, mode1
, bitpos
/ BITS_PER_UNIT
);
4744 to_rtx
= offset_address (to_rtx
, offset_rtx
,
4745 highest_pow2_factor_for_target (to
,
4749 /* No action is needed if the target is not a memory and the field
4750 lies completely outside that target. This can occur if the source
4751 code contains an out-of-bounds access to a small array. */
4753 && GET_MODE (to_rtx
) != BLKmode
4754 && (unsigned HOST_WIDE_INT
) bitpos
4755 >= GET_MODE_PRECISION (GET_MODE (to_rtx
)))
4757 expand_normal (from
);
4760 /* Handle expand_expr of a complex value returning a CONCAT. */
4761 else if (GET_CODE (to_rtx
) == CONCAT
)
4763 unsigned short mode_bitsize
= GET_MODE_BITSIZE (GET_MODE (to_rtx
));
4764 if (COMPLEX_MODE_P (TYPE_MODE (TREE_TYPE (from
)))
4766 && bitsize
== mode_bitsize
)
4767 result
= store_expr (from
, to_rtx
, false, nontemporal
);
4768 else if (bitsize
== mode_bitsize
/ 2
4769 && (bitpos
== 0 || bitpos
== mode_bitsize
/ 2))
4770 result
= store_expr (from
, XEXP (to_rtx
, bitpos
!= 0), false,
4772 else if (bitpos
+ bitsize
<= mode_bitsize
/ 2)
4773 result
= store_field (XEXP (to_rtx
, 0), bitsize
, bitpos
,
4774 bitregion_start
, bitregion_end
,
4775 mode1
, from
, TREE_TYPE (tem
),
4776 get_alias_set (to
), nontemporal
);
4777 else if (bitpos
>= mode_bitsize
/ 2)
4778 result
= store_field (XEXP (to_rtx
, 1), bitsize
,
4779 bitpos
- mode_bitsize
/ 2,
4780 bitregion_start
, bitregion_end
,
4782 TREE_TYPE (tem
), get_alias_set (to
),
4784 else if (bitpos
== 0 && bitsize
== mode_bitsize
)
4787 result
= expand_normal (from
);
4788 from_rtx
= simplify_gen_subreg (GET_MODE (to_rtx
), result
,
4789 TYPE_MODE (TREE_TYPE (from
)), 0);
4790 emit_move_insn (XEXP (to_rtx
, 0),
4791 read_complex_part (from_rtx
, false));
4792 emit_move_insn (XEXP (to_rtx
, 1),
4793 read_complex_part (from_rtx
, true));
4797 rtx temp
= assign_stack_temp (GET_MODE (to_rtx
),
4798 GET_MODE_SIZE (GET_MODE (to_rtx
)),
4800 write_complex_part (temp
, XEXP (to_rtx
, 0), false);
4801 write_complex_part (temp
, XEXP (to_rtx
, 1), true);
4802 result
= store_field (temp
, bitsize
, bitpos
,
4803 bitregion_start
, bitregion_end
,
4805 TREE_TYPE (tem
), get_alias_set (to
),
4807 emit_move_insn (XEXP (to_rtx
, 0), read_complex_part (temp
, false));
4808 emit_move_insn (XEXP (to_rtx
, 1), read_complex_part (temp
, true));
4815 /* If the field is at offset zero, we could have been given the
4816 DECL_RTX of the parent struct. Don't munge it. */
4817 to_rtx
= shallow_copy_rtx (to_rtx
);
4819 set_mem_attributes_minus_bitpos (to_rtx
, to
, 0, bitpos
);
4821 /* Deal with volatile and readonly fields. The former is only
4822 done for MEM. Also set MEM_KEEP_ALIAS_SET_P if needed. */
4824 MEM_VOLATILE_P (to_rtx
) = 1;
4825 if (component_uses_parent_alias_set (to
))
4826 MEM_KEEP_ALIAS_SET_P (to_rtx
) = 1;
4829 if (optimize_bitfield_assignment_op (bitsize
, bitpos
,
4830 bitregion_start
, bitregion_end
,
4835 result
= store_field (to_rtx
, bitsize
, bitpos
,
4836 bitregion_start
, bitregion_end
,
4838 TREE_TYPE (tem
), get_alias_set (to
),
4844 struct expand_operand ops
[2];
4845 enum machine_mode address_mode
;
4847 addr_space_t as
= TYPE_ADDR_SPACE
4848 (TREE_TYPE (TREE_TYPE (TREE_OPERAND (tem
, 0))));
4849 tree base
= TREE_OPERAND (tem
, 0);
4850 address_mode
= targetm
.addr_space
.address_mode (as
);
4851 op0
= expand_expr (base
, NULL_RTX
, VOIDmode
, EXPAND_NORMAL
);
4852 op0
= convert_memory_address_addr_space (address_mode
, op0
, as
);
4853 if (!integer_zerop (TREE_OPERAND (tem
, 1)))
4855 rtx off
= immed_double_int_const (mem_ref_offset (tem
),
4857 op0
= simplify_gen_binary (PLUS
, address_mode
, op0
, off
);
4859 op0
= memory_address_addr_space (mode
, op0
, as
);
4860 mem
= gen_rtx_MEM (mode
, op0
);
4861 set_mem_attributes (mem
, tem
, 0);
4862 set_mem_addr_space (mem
, as
);
4863 if (TREE_THIS_VOLATILE (tem
))
4864 MEM_VOLATILE_P (mem
) = 1;
4866 create_fixed_operand (&ops
[0], mem
);
4867 create_input_operand (&ops
[1], to_rtx
, mode
);
4868 /* The movmisalign<mode> pattern cannot fail, else the assignment
4869 would silently be omitted. */
4870 expand_insn (icode
, 2, ops
);
4874 preserve_temp_slots (result
);
4880 /* If the rhs is a function call and its value is not an aggregate,
4881 call the function before we start to compute the lhs.
4882 This is needed for correct code for cases such as
4883 val = setjmp (buf) on machines where reference to val
4884 requires loading up part of an address in a separate insn.
4886 Don't do this if TO is a VAR_DECL or PARM_DECL whose DECL_RTL is REG
4887 since it might be a promoted variable where the zero- or sign- extension
4888 needs to be done. Handling this in the normal way is safe because no
4889 computation is done before the call. The same is true for SSA names. */
4890 if (TREE_CODE (from
) == CALL_EXPR
&& ! aggregate_value_p (from
, from
)
4891 && COMPLETE_TYPE_P (TREE_TYPE (from
))
4892 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from
))) == INTEGER_CST
4893 && ! (((TREE_CODE (to
) == VAR_DECL
4894 || TREE_CODE (to
) == PARM_DECL
4895 || TREE_CODE (to
) == RESULT_DECL
)
4896 && REG_P (DECL_RTL (to
)))
4897 || TREE_CODE (to
) == SSA_NAME
))
4902 value
= expand_normal (from
);
4904 to_rtx
= expand_expr (to
, NULL_RTX
, VOIDmode
, EXPAND_WRITE
);
4906 /* Handle calls that return values in multiple non-contiguous locations.
4907 The Irix 6 ABI has examples of this. */
4908 if (GET_CODE (to_rtx
) == PARALLEL
)
4909 emit_group_load (to_rtx
, value
, TREE_TYPE (from
),
4910 int_size_in_bytes (TREE_TYPE (from
)));
4911 else if (GET_MODE (to_rtx
) == BLKmode
)
4912 emit_block_move (to_rtx
, value
, expr_size (from
), BLOCK_OP_NORMAL
);
4915 if (POINTER_TYPE_P (TREE_TYPE (to
)))
4916 value
= convert_memory_address_addr_space
4917 (GET_MODE (to_rtx
), value
,
4918 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (to
))));
4920 emit_move_insn (to_rtx
, value
);
4922 preserve_temp_slots (to_rtx
);
4928 /* Ordinary treatment. Expand TO to get a REG or MEM rtx. */
4929 to_rtx
= expand_expr (to
, NULL_RTX
, VOIDmode
, EXPAND_WRITE
);
4931 /* Don't move directly into a return register. */
4932 if (TREE_CODE (to
) == RESULT_DECL
4933 && (REG_P (to_rtx
) || GET_CODE (to_rtx
) == PARALLEL
))
4938 if (REG_P (to_rtx
) && TYPE_MODE (TREE_TYPE (from
)) == BLKmode
)
4939 temp
= copy_blkmode_to_reg (GET_MODE (to_rtx
), from
);
4941 temp
= expand_expr (from
, NULL_RTX
, GET_MODE (to_rtx
), EXPAND_NORMAL
);
4943 if (GET_CODE (to_rtx
) == PARALLEL
)
4944 emit_group_load (to_rtx
, temp
, TREE_TYPE (from
),
4945 int_size_in_bytes (TREE_TYPE (from
)));
4947 emit_move_insn (to_rtx
, temp
);
4949 preserve_temp_slots (to_rtx
);
4955 /* In case we are returning the contents of an object which overlaps
4956 the place the value is being stored, use a safe function when copying
4957 a value through a pointer into a structure value return block. */
4958 if (TREE_CODE (to
) == RESULT_DECL
4959 && TREE_CODE (from
) == INDIRECT_REF
4960 && ADDR_SPACE_GENERIC_P
4961 (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (from
, 0)))))
4962 && refs_may_alias_p (to
, from
)
4963 && cfun
->returns_struct
4964 && !cfun
->returns_pcc_struct
)
4969 size
= expr_size (from
);
4970 from_rtx
= expand_normal (from
);
4972 emit_library_call (memmove_libfunc
, LCT_NORMAL
,
4973 VOIDmode
, 3, XEXP (to_rtx
, 0), Pmode
,
4974 XEXP (from_rtx
, 0), Pmode
,
4975 convert_to_mode (TYPE_MODE (sizetype
),
4976 size
, TYPE_UNSIGNED (sizetype
)),
4977 TYPE_MODE (sizetype
));
4979 preserve_temp_slots (to_rtx
);
4985 /* Compute FROM and store the value in the rtx we got. */
4988 result
= store_expr (from
, to_rtx
, 0, nontemporal
);
4989 preserve_temp_slots (result
);
4995 /* Emits nontemporal store insn that moves FROM to TO. Returns true if this
4996 succeeded, false otherwise. */
4999 emit_storent_insn (rtx to
, rtx from
)
5001 struct expand_operand ops
[2];
5002 enum machine_mode mode
= GET_MODE (to
);
5003 enum insn_code code
= optab_handler (storent_optab
, mode
);
5005 if (code
== CODE_FOR_nothing
)
5008 create_fixed_operand (&ops
[0], to
);
5009 create_input_operand (&ops
[1], from
, mode
);
5010 return maybe_expand_insn (code
, 2, ops
);
5013 /* Generate code for computing expression EXP,
5014 and storing the value into TARGET.
5016 If the mode is BLKmode then we may return TARGET itself.
5017 It turns out that in BLKmode it doesn't cause a problem.
5018 because C has no operators that could combine two different
5019 assignments into the same BLKmode object with different values
5020 with no sequence point. Will other languages need this to
5023 If CALL_PARAM_P is nonzero, this is a store into a call param on the
5024 stack, and block moves may need to be treated specially.
5026 If NONTEMPORAL is true, try using a nontemporal store instruction. */
5029 store_expr (tree exp
, rtx target
, int call_param_p
, bool nontemporal
)
5032 rtx alt_rtl
= NULL_RTX
;
5033 location_t loc
= EXPR_LOCATION (exp
);
5035 if (VOID_TYPE_P (TREE_TYPE (exp
)))
5037 /* C++ can generate ?: expressions with a throw expression in one
5038 branch and an rvalue in the other. Here, we resolve attempts to
5039 store the throw expression's nonexistent result. */
5040 gcc_assert (!call_param_p
);
5041 expand_expr (exp
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
5044 if (TREE_CODE (exp
) == COMPOUND_EXPR
)
5046 /* Perform first part of compound expression, then assign from second
5048 expand_expr (TREE_OPERAND (exp
, 0), const0_rtx
, VOIDmode
,
5049 call_param_p
? EXPAND_STACK_PARM
: EXPAND_NORMAL
);
5050 return store_expr (TREE_OPERAND (exp
, 1), target
, call_param_p
,
5053 else if (TREE_CODE (exp
) == COND_EXPR
&& GET_MODE (target
) == BLKmode
)
5055 /* For conditional expression, get safe form of the target. Then
5056 test the condition, doing the appropriate assignment on either
5057 side. This avoids the creation of unnecessary temporaries.
5058 For non-BLKmode, it is more efficient not to do this. */
5060 rtx lab1
= gen_label_rtx (), lab2
= gen_label_rtx ();
5062 do_pending_stack_adjust ();
5064 jumpifnot (TREE_OPERAND (exp
, 0), lab1
, -1);
5065 store_expr (TREE_OPERAND (exp
, 1), target
, call_param_p
,
5067 emit_jump_insn (gen_jump (lab2
));
5070 store_expr (TREE_OPERAND (exp
, 2), target
, call_param_p
,
5077 else if (GET_CODE (target
) == SUBREG
&& SUBREG_PROMOTED_VAR_P (target
))
5078 /* If this is a scalar in a register that is stored in a wider mode
5079 than the declared mode, compute the result into its declared mode
5080 and then convert to the wider mode. Our value is the computed
5083 rtx inner_target
= 0;
5085 /* We can do the conversion inside EXP, which will often result
5086 in some optimizations. Do the conversion in two steps: first
5087 change the signedness, if needed, then the extend. But don't
5088 do this if the type of EXP is a subtype of something else
5089 since then the conversion might involve more than just
5090 converting modes. */
5091 if (INTEGRAL_TYPE_P (TREE_TYPE (exp
))
5092 && TREE_TYPE (TREE_TYPE (exp
)) == 0
5093 && GET_MODE_PRECISION (GET_MODE (target
))
5094 == TYPE_PRECISION (TREE_TYPE (exp
)))
5096 if (TYPE_UNSIGNED (TREE_TYPE (exp
))
5097 != SUBREG_PROMOTED_UNSIGNED_P (target
))
5099 /* Some types, e.g. Fortran's logical*4, won't have a signed
5100 version, so use the mode instead. */
5102 = (signed_or_unsigned_type_for
5103 (SUBREG_PROMOTED_UNSIGNED_P (target
), TREE_TYPE (exp
)));
5105 ntype
= lang_hooks
.types
.type_for_mode
5106 (TYPE_MODE (TREE_TYPE (exp
)),
5107 SUBREG_PROMOTED_UNSIGNED_P (target
));
5109 exp
= fold_convert_loc (loc
, ntype
, exp
);
5112 exp
= fold_convert_loc (loc
, lang_hooks
.types
.type_for_mode
5113 (GET_MODE (SUBREG_REG (target
)),
5114 SUBREG_PROMOTED_UNSIGNED_P (target
)),
5117 inner_target
= SUBREG_REG (target
);
5120 temp
= expand_expr (exp
, inner_target
, VOIDmode
,
5121 call_param_p
? EXPAND_STACK_PARM
: EXPAND_NORMAL
);
5123 /* If TEMP is a VOIDmode constant, use convert_modes to make
5124 sure that we properly convert it. */
5125 if (CONSTANT_P (temp
) && GET_MODE (temp
) == VOIDmode
)
5127 temp
= convert_modes (GET_MODE (target
), TYPE_MODE (TREE_TYPE (exp
)),
5128 temp
, SUBREG_PROMOTED_UNSIGNED_P (target
));
5129 temp
= convert_modes (GET_MODE (SUBREG_REG (target
)),
5130 GET_MODE (target
), temp
,
5131 SUBREG_PROMOTED_UNSIGNED_P (target
));
5134 convert_move (SUBREG_REG (target
), temp
,
5135 SUBREG_PROMOTED_UNSIGNED_P (target
));
5139 else if ((TREE_CODE (exp
) == STRING_CST
5140 || (TREE_CODE (exp
) == MEM_REF
5141 && TREE_CODE (TREE_OPERAND (exp
, 0)) == ADDR_EXPR
5142 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp
, 0), 0))
5144 && integer_zerop (TREE_OPERAND (exp
, 1))))
5145 && !nontemporal
&& !call_param_p
5148 /* Optimize initialization of an array with a STRING_CST. */
5149 HOST_WIDE_INT exp_len
, str_copy_len
;
5151 tree str
= TREE_CODE (exp
) == STRING_CST
5152 ? exp
: TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
5154 exp_len
= int_expr_size (exp
);
5158 if (TREE_STRING_LENGTH (str
) <= 0)
5161 str_copy_len
= strlen (TREE_STRING_POINTER (str
));
5162 if (str_copy_len
< TREE_STRING_LENGTH (str
) - 1)
5165 str_copy_len
= TREE_STRING_LENGTH (str
);
5166 if ((STORE_MAX_PIECES
& (STORE_MAX_PIECES
- 1)) == 0
5167 && TREE_STRING_POINTER (str
)[TREE_STRING_LENGTH (str
) - 1] == '\0')
5169 str_copy_len
+= STORE_MAX_PIECES
- 1;
5170 str_copy_len
&= ~(STORE_MAX_PIECES
- 1);
5172 str_copy_len
= MIN (str_copy_len
, exp_len
);
5173 if (!can_store_by_pieces (str_copy_len
, builtin_strncpy_read_str
,
5174 CONST_CAST (char *, TREE_STRING_POINTER (str
)),
5175 MEM_ALIGN (target
), false))
5180 dest_mem
= store_by_pieces (dest_mem
,
5181 str_copy_len
, builtin_strncpy_read_str
,
5183 TREE_STRING_POINTER (str
)),
5184 MEM_ALIGN (target
), false,
5185 exp_len
> str_copy_len
? 1 : 0);
5186 if (exp_len
> str_copy_len
)
5187 clear_storage (adjust_address (dest_mem
, BLKmode
, 0),
5188 GEN_INT (exp_len
- str_copy_len
),
5197 /* If we want to use a nontemporal store, force the value to
5199 tmp_target
= nontemporal
? NULL_RTX
: target
;
5200 temp
= expand_expr_real (exp
, tmp_target
, GET_MODE (target
),
5202 ? EXPAND_STACK_PARM
: EXPAND_NORMAL
),
5206 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
5207 the same as that of TARGET, adjust the constant. This is needed, for
5208 example, in case it is a CONST_DOUBLE and we want only a word-sized
5210 if (CONSTANT_P (temp
) && GET_MODE (temp
) == VOIDmode
5211 && TREE_CODE (exp
) != ERROR_MARK
5212 && GET_MODE (target
) != TYPE_MODE (TREE_TYPE (exp
)))
5213 temp
= convert_modes (GET_MODE (target
), TYPE_MODE (TREE_TYPE (exp
)),
5214 temp
, TYPE_UNSIGNED (TREE_TYPE (exp
)));
5216 /* If value was not generated in the target, store it there.
5217 Convert the value to TARGET's type first if necessary and emit the
5218 pending incrementations that have been queued when expanding EXP.
5219 Note that we cannot emit the whole queue blindly because this will
5220 effectively disable the POST_INC optimization later.
5222 If TEMP and TARGET compare equal according to rtx_equal_p, but
5223 one or both of them are volatile memory refs, we have to distinguish
5225 - expand_expr has used TARGET. In this case, we must not generate
5226 another copy. This can be detected by TARGET being equal according
5228 - expand_expr has not used TARGET - that means that the source just
5229 happens to have the same RTX form. Since temp will have been created
5230 by expand_expr, it will compare unequal according to == .
5231 We must generate a copy in this case, to reach the correct number
5232 of volatile memory references. */
5234 if ((! rtx_equal_p (temp
, target
)
5235 || (temp
!= target
&& (side_effects_p (temp
)
5236 || side_effects_p (target
))))
5237 && TREE_CODE (exp
) != ERROR_MARK
5238 /* If store_expr stores a DECL whose DECL_RTL(exp) == TARGET,
5239 but TARGET is not valid memory reference, TEMP will differ
5240 from TARGET although it is really the same location. */
5242 && rtx_equal_p (alt_rtl
, target
)
5243 && !side_effects_p (alt_rtl
)
5244 && !side_effects_p (target
))
5245 /* If there's nothing to copy, don't bother. Don't call
5246 expr_size unless necessary, because some front-ends (C++)
5247 expr_size-hook must not be given objects that are not
5248 supposed to be bit-copied or bit-initialized. */
5249 && expr_size (exp
) != const0_rtx
)
5251 if (GET_MODE (temp
) != GET_MODE (target
)
5252 && GET_MODE (temp
) != VOIDmode
)
5254 int unsignedp
= TYPE_UNSIGNED (TREE_TYPE (exp
));
5255 if (GET_MODE (target
) == BLKmode
5256 && GET_MODE (temp
) == BLKmode
)
5257 emit_block_move (target
, temp
, expr_size (exp
),
5259 ? BLOCK_OP_CALL_PARM
5260 : BLOCK_OP_NORMAL
));
5261 else if (GET_MODE (target
) == BLKmode
)
5262 store_bit_field (target
, INTVAL (expr_size (exp
)) * BITS_PER_UNIT
,
5263 0, 0, 0, GET_MODE (temp
), temp
);
5265 convert_move (target
, temp
, unsignedp
);
5268 else if (GET_MODE (temp
) == BLKmode
&& TREE_CODE (exp
) == STRING_CST
)
5270 /* Handle copying a string constant into an array. The string
5271 constant may be shorter than the array. So copy just the string's
5272 actual length, and clear the rest. First get the size of the data
5273 type of the string, which is actually the size of the target. */
5274 rtx size
= expr_size (exp
);
5276 if (CONST_INT_P (size
)
5277 && INTVAL (size
) < TREE_STRING_LENGTH (exp
))
5278 emit_block_move (target
, temp
, size
,
5280 ? BLOCK_OP_CALL_PARM
: BLOCK_OP_NORMAL
));
5283 enum machine_mode pointer_mode
5284 = targetm
.addr_space
.pointer_mode (MEM_ADDR_SPACE (target
));
5285 enum machine_mode address_mode
5286 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (target
));
5288 /* Compute the size of the data to copy from the string. */
5290 = size_binop_loc (loc
, MIN_EXPR
,
5291 make_tree (sizetype
, size
),
5292 size_int (TREE_STRING_LENGTH (exp
)));
5294 = expand_expr (copy_size
, NULL_RTX
, VOIDmode
,
5296 ? EXPAND_STACK_PARM
: EXPAND_NORMAL
));
5299 /* Copy that much. */
5300 copy_size_rtx
= convert_to_mode (pointer_mode
, copy_size_rtx
,
5301 TYPE_UNSIGNED (sizetype
));
5302 emit_block_move (target
, temp
, copy_size_rtx
,
5304 ? BLOCK_OP_CALL_PARM
: BLOCK_OP_NORMAL
));
5306 /* Figure out how much is left in TARGET that we have to clear.
5307 Do all calculations in pointer_mode. */
5308 if (CONST_INT_P (copy_size_rtx
))
5310 size
= plus_constant (size
, -INTVAL (copy_size_rtx
));
5311 target
= adjust_address (target
, BLKmode
,
5312 INTVAL (copy_size_rtx
));
5316 size
= expand_binop (TYPE_MODE (sizetype
), sub_optab
, size
,
5317 copy_size_rtx
, NULL_RTX
, 0,
5320 if (GET_MODE (copy_size_rtx
) != address_mode
)
5321 copy_size_rtx
= convert_to_mode (address_mode
,
5323 TYPE_UNSIGNED (sizetype
));
5325 target
= offset_address (target
, copy_size_rtx
,
5326 highest_pow2_factor (copy_size
));
5327 label
= gen_label_rtx ();
5328 emit_cmp_and_jump_insns (size
, const0_rtx
, LT
, NULL_RTX
,
5329 GET_MODE (size
), 0, label
);
5332 if (size
!= const0_rtx
)
5333 clear_storage (target
, size
, BLOCK_OP_NORMAL
);
5339 /* Handle calls that return values in multiple non-contiguous locations.
5340 The Irix 6 ABI has examples of this. */
5341 else if (GET_CODE (target
) == PARALLEL
)
5342 emit_group_load (target
, temp
, TREE_TYPE (exp
),
5343 int_size_in_bytes (TREE_TYPE (exp
)));
5344 else if (GET_MODE (temp
) == BLKmode
)
5345 emit_block_move (target
, temp
, expr_size (exp
),
5347 ? BLOCK_OP_CALL_PARM
: BLOCK_OP_NORMAL
));
5348 else if (nontemporal
5349 && emit_storent_insn (target
, temp
))
5350 /* If we managed to emit a nontemporal store, there is nothing else to
5355 temp
= force_operand (temp
, target
);
5357 emit_move_insn (target
, temp
);
5364 /* Return true if field F of structure TYPE is a flexible array. */
5367 flexible_array_member_p (const_tree f
, const_tree type
)
5372 return (DECL_CHAIN (f
) == NULL
5373 && TREE_CODE (tf
) == ARRAY_TYPE
5375 && TYPE_MIN_VALUE (TYPE_DOMAIN (tf
))
5376 && integer_zerop (TYPE_MIN_VALUE (TYPE_DOMAIN (tf
)))
5377 && !TYPE_MAX_VALUE (TYPE_DOMAIN (tf
))
5378 && int_size_in_bytes (type
) >= 0);
5381 /* If FOR_CTOR_P, return the number of top-level elements that a constructor
5382 must have in order for it to completely initialize a value of type TYPE.
5383 Return -1 if the number isn't known.
5385 If !FOR_CTOR_P, return an estimate of the number of scalars in TYPE. */
5387 static HOST_WIDE_INT
5388 count_type_elements (const_tree type
, bool for_ctor_p
)
5390 switch (TREE_CODE (type
))
5396 nelts
= array_type_nelts (type
);
5397 if (nelts
&& host_integerp (nelts
, 1))
5399 unsigned HOST_WIDE_INT n
;
5401 n
= tree_low_cst (nelts
, 1) + 1;
5402 if (n
== 0 || for_ctor_p
)
5405 return n
* count_type_elements (TREE_TYPE (type
), false);
5407 return for_ctor_p
? -1 : 1;
5412 unsigned HOST_WIDE_INT n
;
5416 for (f
= TYPE_FIELDS (type
); f
; f
= DECL_CHAIN (f
))
5417 if (TREE_CODE (f
) == FIELD_DECL
)
5420 n
+= count_type_elements (TREE_TYPE (f
), false);
5421 else if (!flexible_array_member_p (f
, type
))
5422 /* Don't count flexible arrays, which are not supposed
5423 to be initialized. */
5431 case QUAL_UNION_TYPE
:
5436 gcc_assert (!for_ctor_p
);
5437 /* Estimate the number of scalars in each field and pick the
5438 maximum. Other estimates would do instead; the idea is simply
5439 to make sure that the estimate is not sensitive to the ordering
5442 for (f
= TYPE_FIELDS (type
); f
; f
= DECL_CHAIN (f
))
5443 if (TREE_CODE (f
) == FIELD_DECL
)
5445 m
= count_type_elements (TREE_TYPE (f
), false);
5446 /* If the field doesn't span the whole union, add an extra
5447 scalar for the rest. */
5448 if (simple_cst_equal (TYPE_SIZE (TREE_TYPE (f
)),
5449 TYPE_SIZE (type
)) != 1)
5461 return TYPE_VECTOR_SUBPARTS (type
);
5465 case FIXED_POINT_TYPE
:
5470 case REFERENCE_TYPE
:
5486 /* Helper for categorize_ctor_elements. Identical interface. */
5489 categorize_ctor_elements_1 (const_tree ctor
, HOST_WIDE_INT
*p_nz_elts
,
5490 HOST_WIDE_INT
*p_init_elts
, bool *p_complete
)
5492 unsigned HOST_WIDE_INT idx
;
5493 HOST_WIDE_INT nz_elts
, init_elts
, num_fields
;
5494 tree value
, purpose
, elt_type
;
5496 /* Whether CTOR is a valid constant initializer, in accordance with what
5497 initializer_constant_valid_p does. If inferred from the constructor
5498 elements, true until proven otherwise. */
5499 bool const_from_elts_p
= constructor_static_from_elts_p (ctor
);
5500 bool const_p
= const_from_elts_p
? true : TREE_STATIC (ctor
);
5505 elt_type
= NULL_TREE
;
5507 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor
), idx
, purpose
, value
)
5509 HOST_WIDE_INT mult
= 1;
5511 if (TREE_CODE (purpose
) == RANGE_EXPR
)
5513 tree lo_index
= TREE_OPERAND (purpose
, 0);
5514 tree hi_index
= TREE_OPERAND (purpose
, 1);
5516 if (host_integerp (lo_index
, 1) && host_integerp (hi_index
, 1))
5517 mult
= (tree_low_cst (hi_index
, 1)
5518 - tree_low_cst (lo_index
, 1) + 1);
5521 elt_type
= TREE_TYPE (value
);
5523 switch (TREE_CODE (value
))
5527 HOST_WIDE_INT nz
= 0, ic
= 0;
5529 bool const_elt_p
= categorize_ctor_elements_1 (value
, &nz
, &ic
,
5532 nz_elts
+= mult
* nz
;
5533 init_elts
+= mult
* ic
;
5535 if (const_from_elts_p
&& const_p
)
5536 const_p
= const_elt_p
;
5543 if (!initializer_zerop (value
))
5549 nz_elts
+= mult
* TREE_STRING_LENGTH (value
);
5550 init_elts
+= mult
* TREE_STRING_LENGTH (value
);
5554 if (!initializer_zerop (TREE_REALPART (value
)))
5556 if (!initializer_zerop (TREE_IMAGPART (value
)))
5564 for (v
= TREE_VECTOR_CST_ELTS (value
); v
; v
= TREE_CHAIN (v
))
5566 if (!initializer_zerop (TREE_VALUE (v
)))
5575 HOST_WIDE_INT tc
= count_type_elements (elt_type
, false);
5576 nz_elts
+= mult
* tc
;
5577 init_elts
+= mult
* tc
;
5579 if (const_from_elts_p
&& const_p
)
5580 const_p
= initializer_constant_valid_p (value
, elt_type
)
5587 if (*p_complete
&& !complete_ctor_at_level_p (TREE_TYPE (ctor
),
5588 num_fields
, elt_type
))
5589 *p_complete
= false;
5591 *p_nz_elts
+= nz_elts
;
5592 *p_init_elts
+= init_elts
;
5597 /* Examine CTOR to discover:
5598 * how many scalar fields are set to nonzero values,
5599 and place it in *P_NZ_ELTS;
5600 * how many scalar fields in total are in CTOR,
5601 and place it in *P_ELT_COUNT.
5602 * whether the constructor is complete -- in the sense that every
5603 meaningful byte is explicitly given a value --
5604 and place it in *P_COMPLETE.
5606 Return whether or not CTOR is a valid static constant initializer, the same
5607 as "initializer_constant_valid_p (CTOR, TREE_TYPE (CTOR)) != 0". */
5610 categorize_ctor_elements (const_tree ctor
, HOST_WIDE_INT
*p_nz_elts
,
5611 HOST_WIDE_INT
*p_init_elts
, bool *p_complete
)
5617 return categorize_ctor_elements_1 (ctor
, p_nz_elts
, p_init_elts
, p_complete
);
5620 /* TYPE is initialized by a constructor with NUM_ELTS elements, the last
5621 of which had type LAST_TYPE. Each element was itself a complete
5622 initializer, in the sense that every meaningful byte was explicitly
5623 given a value. Return true if the same is true for the constructor
5627 complete_ctor_at_level_p (const_tree type
, HOST_WIDE_INT num_elts
,
5628 const_tree last_type
)
5630 if (TREE_CODE (type
) == UNION_TYPE
5631 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
5636 gcc_assert (num_elts
== 1 && last_type
);
5638 /* ??? We could look at each element of the union, and find the
5639 largest element. Which would avoid comparing the size of the
5640 initialized element against any tail padding in the union.
5641 Doesn't seem worth the effort... */
5642 return simple_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (last_type
)) == 1;
5645 return count_type_elements (type
, true) == num_elts
;
5648 /* Return 1 if EXP contains mostly (3/4) zeros. */
5651 mostly_zeros_p (const_tree exp
)
5653 if (TREE_CODE (exp
) == CONSTRUCTOR
)
5655 HOST_WIDE_INT nz_elts
, init_elts
;
5658 categorize_ctor_elements (exp
, &nz_elts
, &init_elts
, &complete_p
);
5659 return !complete_p
|| nz_elts
< init_elts
/ 4;
5662 return initializer_zerop (exp
);
5665 /* Return 1 if EXP contains all zeros. */
5668 all_zeros_p (const_tree exp
)
5670 if (TREE_CODE (exp
) == CONSTRUCTOR
)
5672 HOST_WIDE_INT nz_elts
, init_elts
;
5675 categorize_ctor_elements (exp
, &nz_elts
, &init_elts
, &complete_p
);
5676 return nz_elts
== 0;
5679 return initializer_zerop (exp
);
5682 /* Helper function for store_constructor.
5683 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
5684 TYPE is the type of the CONSTRUCTOR, not the element type.
5685 CLEARED is as for store_constructor.
5686 ALIAS_SET is the alias set to use for any stores.
5688 This provides a recursive shortcut back to store_constructor when it isn't
5689 necessary to go through store_field. This is so that we can pass through
5690 the cleared field to let store_constructor know that we may not have to
5691 clear a substructure if the outer structure has already been cleared. */
5694 store_constructor_field (rtx target
, unsigned HOST_WIDE_INT bitsize
,
5695 HOST_WIDE_INT bitpos
, enum machine_mode mode
,
5696 tree exp
, tree type
, int cleared
,
5697 alias_set_type alias_set
)
5699 if (TREE_CODE (exp
) == CONSTRUCTOR
5700 /* We can only call store_constructor recursively if the size and
5701 bit position are on a byte boundary. */
5702 && bitpos
% BITS_PER_UNIT
== 0
5703 && (bitsize
> 0 && bitsize
% BITS_PER_UNIT
== 0)
5704 /* If we have a nonzero bitpos for a register target, then we just
5705 let store_field do the bitfield handling. This is unlikely to
5706 generate unnecessary clear instructions anyways. */
5707 && (bitpos
== 0 || MEM_P (target
)))
5711 = adjust_address (target
,
5712 GET_MODE (target
) == BLKmode
5714 % GET_MODE_ALIGNMENT (GET_MODE (target
)))
5715 ? BLKmode
: VOIDmode
, bitpos
/ BITS_PER_UNIT
);
5718 /* Update the alias set, if required. */
5719 if (MEM_P (target
) && ! MEM_KEEP_ALIAS_SET_P (target
)
5720 && MEM_ALIAS_SET (target
) != 0)
5722 target
= copy_rtx (target
);
5723 set_mem_alias_set (target
, alias_set
);
5726 store_constructor (exp
, target
, cleared
, bitsize
/ BITS_PER_UNIT
);
5729 store_field (target
, bitsize
, bitpos
, 0, 0, mode
, exp
, type
, alias_set
,
5733 /* Store the value of constructor EXP into the rtx TARGET.
5734 TARGET is either a REG or a MEM; we know it cannot conflict, since
5735 safe_from_p has been called.
5736 CLEARED is true if TARGET is known to have been zero'd.
5737 SIZE is the number of bytes of TARGET we are allowed to modify: this
5738 may not be the same as the size of EXP if we are assigning to a field
5739 which has been packed to exclude padding bits. */
5742 store_constructor (tree exp
, rtx target
, int cleared
, HOST_WIDE_INT size
)
5744 tree type
= TREE_TYPE (exp
);
5745 #ifdef WORD_REGISTER_OPERATIONS
5746 HOST_WIDE_INT exp_size
= int_size_in_bytes (type
);
5749 switch (TREE_CODE (type
))
5753 case QUAL_UNION_TYPE
:
5755 unsigned HOST_WIDE_INT idx
;
5758 /* If size is zero or the target is already cleared, do nothing. */
5759 if (size
== 0 || cleared
)
5761 /* We either clear the aggregate or indicate the value is dead. */
5762 else if ((TREE_CODE (type
) == UNION_TYPE
5763 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
5764 && ! CONSTRUCTOR_ELTS (exp
))
5765 /* If the constructor is empty, clear the union. */
5767 clear_storage (target
, expr_size (exp
), BLOCK_OP_NORMAL
);
5771 /* If we are building a static constructor into a register,
5772 set the initial value as zero so we can fold the value into
5773 a constant. But if more than one register is involved,
5774 this probably loses. */
5775 else if (REG_P (target
) && TREE_STATIC (exp
)
5776 && GET_MODE_SIZE (GET_MODE (target
)) <= UNITS_PER_WORD
)
5778 emit_move_insn (target
, CONST0_RTX (GET_MODE (target
)));
5782 /* If the constructor has fewer fields than the structure or
5783 if we are initializing the structure to mostly zeros, clear
5784 the whole structure first. Don't do this if TARGET is a
5785 register whose mode size isn't equal to SIZE since
5786 clear_storage can't handle this case. */
5788 && (((int)VEC_length (constructor_elt
, CONSTRUCTOR_ELTS (exp
))
5789 != fields_length (type
))
5790 || mostly_zeros_p (exp
))
5792 || ((HOST_WIDE_INT
) GET_MODE_SIZE (GET_MODE (target
))
5795 clear_storage (target
, GEN_INT (size
), BLOCK_OP_NORMAL
);
5799 if (REG_P (target
) && !cleared
)
5800 emit_clobber (target
);
5802 /* Store each element of the constructor into the
5803 corresponding field of TARGET. */
5804 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, field
, value
)
5806 enum machine_mode mode
;
5807 HOST_WIDE_INT bitsize
;
5808 HOST_WIDE_INT bitpos
= 0;
5810 rtx to_rtx
= target
;
5812 /* Just ignore missing fields. We cleared the whole
5813 structure, above, if any fields are missing. */
5817 if (cleared
&& initializer_zerop (value
))
5820 if (host_integerp (DECL_SIZE (field
), 1))
5821 bitsize
= tree_low_cst (DECL_SIZE (field
), 1);
5825 mode
= DECL_MODE (field
);
5826 if (DECL_BIT_FIELD (field
))
5829 offset
= DECL_FIELD_OFFSET (field
);
5830 if (host_integerp (offset
, 0)
5831 && host_integerp (bit_position (field
), 0))
5833 bitpos
= int_bit_position (field
);
5837 bitpos
= tree_low_cst (DECL_FIELD_BIT_OFFSET (field
), 0);
5841 enum machine_mode address_mode
;
5845 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (offset
,
5846 make_tree (TREE_TYPE (exp
),
5849 offset_rtx
= expand_normal (offset
);
5850 gcc_assert (MEM_P (to_rtx
));
5853 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (to_rtx
));
5854 if (GET_MODE (offset_rtx
) != address_mode
)
5855 offset_rtx
= convert_to_mode (address_mode
, offset_rtx
, 0);
5857 to_rtx
= offset_address (to_rtx
, offset_rtx
,
5858 highest_pow2_factor (offset
));
5861 #ifdef WORD_REGISTER_OPERATIONS
5862 /* If this initializes a field that is smaller than a
5863 word, at the start of a word, try to widen it to a full
5864 word. This special case allows us to output C++ member
5865 function initializations in a form that the optimizers
5868 && bitsize
< BITS_PER_WORD
5869 && bitpos
% BITS_PER_WORD
== 0
5870 && GET_MODE_CLASS (mode
) == MODE_INT
5871 && TREE_CODE (value
) == INTEGER_CST
5873 && bitpos
+ BITS_PER_WORD
<= exp_size
* BITS_PER_UNIT
)
5875 tree type
= TREE_TYPE (value
);
5877 if (TYPE_PRECISION (type
) < BITS_PER_WORD
)
5879 type
= lang_hooks
.types
.type_for_size
5880 (BITS_PER_WORD
, TYPE_UNSIGNED (type
));
5881 value
= fold_convert (type
, value
);
5884 if (BYTES_BIG_ENDIAN
)
5886 = fold_build2 (LSHIFT_EXPR
, type
, value
,
5887 build_int_cst (type
,
5888 BITS_PER_WORD
- bitsize
));
5889 bitsize
= BITS_PER_WORD
;
5894 if (MEM_P (to_rtx
) && !MEM_KEEP_ALIAS_SET_P (to_rtx
)
5895 && DECL_NONADDRESSABLE_P (field
))
5897 to_rtx
= copy_rtx (to_rtx
);
5898 MEM_KEEP_ALIAS_SET_P (to_rtx
) = 1;
5901 store_constructor_field (to_rtx
, bitsize
, bitpos
, mode
,
5902 value
, type
, cleared
,
5903 get_alias_set (TREE_TYPE (field
)));
5910 unsigned HOST_WIDE_INT i
;
5913 tree elttype
= TREE_TYPE (type
);
5915 HOST_WIDE_INT minelt
= 0;
5916 HOST_WIDE_INT maxelt
= 0;
5918 domain
= TYPE_DOMAIN (type
);
5919 const_bounds_p
= (TYPE_MIN_VALUE (domain
)
5920 && TYPE_MAX_VALUE (domain
)
5921 && host_integerp (TYPE_MIN_VALUE (domain
), 0)
5922 && host_integerp (TYPE_MAX_VALUE (domain
), 0));
5924 /* If we have constant bounds for the range of the type, get them. */
5927 minelt
= tree_low_cst (TYPE_MIN_VALUE (domain
), 0);
5928 maxelt
= tree_low_cst (TYPE_MAX_VALUE (domain
), 0);
5931 /* If the constructor has fewer elements than the array, clear
5932 the whole array first. Similarly if this is static
5933 constructor of a non-BLKmode object. */
5936 else if (REG_P (target
) && TREE_STATIC (exp
))
5940 unsigned HOST_WIDE_INT idx
;
5942 HOST_WIDE_INT count
= 0, zero_count
= 0;
5943 need_to_clear
= ! const_bounds_p
;
5945 /* This loop is a more accurate version of the loop in
5946 mostly_zeros_p (it handles RANGE_EXPR in an index). It
5947 is also needed to check for missing elements. */
5948 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, index
, value
)
5950 HOST_WIDE_INT this_node_count
;
5955 if (index
!= NULL_TREE
&& TREE_CODE (index
) == RANGE_EXPR
)
5957 tree lo_index
= TREE_OPERAND (index
, 0);
5958 tree hi_index
= TREE_OPERAND (index
, 1);
5960 if (! host_integerp (lo_index
, 1)
5961 || ! host_integerp (hi_index
, 1))
5967 this_node_count
= (tree_low_cst (hi_index
, 1)
5968 - tree_low_cst (lo_index
, 1) + 1);
5971 this_node_count
= 1;
5973 count
+= this_node_count
;
5974 if (mostly_zeros_p (value
))
5975 zero_count
+= this_node_count
;
5978 /* Clear the entire array first if there are any missing
5979 elements, or if the incidence of zero elements is >=
5982 && (count
< maxelt
- minelt
+ 1
5983 || 4 * zero_count
>= 3 * count
))
5987 if (need_to_clear
&& size
> 0)
5990 emit_move_insn (target
, CONST0_RTX (GET_MODE (target
)));
5992 clear_storage (target
, GEN_INT (size
), BLOCK_OP_NORMAL
);
5996 if (!cleared
&& REG_P (target
))
5997 /* Inform later passes that the old value is dead. */
5998 emit_clobber (target
);
6000 /* Store each element of the constructor into the
6001 corresponding element of TARGET, determined by counting the
6003 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), i
, index
, value
)
6005 enum machine_mode mode
;
6006 HOST_WIDE_INT bitsize
;
6007 HOST_WIDE_INT bitpos
;
6008 rtx xtarget
= target
;
6010 if (cleared
&& initializer_zerop (value
))
6013 mode
= TYPE_MODE (elttype
);
6014 if (mode
== BLKmode
)
6015 bitsize
= (host_integerp (TYPE_SIZE (elttype
), 1)
6016 ? tree_low_cst (TYPE_SIZE (elttype
), 1)
6019 bitsize
= GET_MODE_BITSIZE (mode
);
6021 if (index
!= NULL_TREE
&& TREE_CODE (index
) == RANGE_EXPR
)
6023 tree lo_index
= TREE_OPERAND (index
, 0);
6024 tree hi_index
= TREE_OPERAND (index
, 1);
6025 rtx index_r
, pos_rtx
;
6026 HOST_WIDE_INT lo
, hi
, count
;
6029 /* If the range is constant and "small", unroll the loop. */
6031 && host_integerp (lo_index
, 0)
6032 && host_integerp (hi_index
, 0)
6033 && (lo
= tree_low_cst (lo_index
, 0),
6034 hi
= tree_low_cst (hi_index
, 0),
6035 count
= hi
- lo
+ 1,
6038 || (host_integerp (TYPE_SIZE (elttype
), 1)
6039 && (tree_low_cst (TYPE_SIZE (elttype
), 1) * count
6042 lo
-= minelt
; hi
-= minelt
;
6043 for (; lo
<= hi
; lo
++)
6045 bitpos
= lo
* tree_low_cst (TYPE_SIZE (elttype
), 0);
6048 && !MEM_KEEP_ALIAS_SET_P (target
)
6049 && TREE_CODE (type
) == ARRAY_TYPE
6050 && TYPE_NONALIASED_COMPONENT (type
))
6052 target
= copy_rtx (target
);
6053 MEM_KEEP_ALIAS_SET_P (target
) = 1;
6056 store_constructor_field
6057 (target
, bitsize
, bitpos
, mode
, value
, type
, cleared
,
6058 get_alias_set (elttype
));
6063 rtx loop_start
= gen_label_rtx ();
6064 rtx loop_end
= gen_label_rtx ();
6067 expand_normal (hi_index
);
6069 index
= build_decl (EXPR_LOCATION (exp
),
6070 VAR_DECL
, NULL_TREE
, domain
);
6071 index_r
= gen_reg_rtx (promote_decl_mode (index
, NULL
));
6072 SET_DECL_RTL (index
, index_r
);
6073 store_expr (lo_index
, index_r
, 0, false);
6075 /* Build the head of the loop. */
6076 do_pending_stack_adjust ();
6077 emit_label (loop_start
);
6079 /* Assign value to element index. */
6081 fold_convert (ssizetype
,
6082 fold_build2 (MINUS_EXPR
,
6085 TYPE_MIN_VALUE (domain
)));
6088 size_binop (MULT_EXPR
, position
,
6089 fold_convert (ssizetype
,
6090 TYPE_SIZE_UNIT (elttype
)));
6092 pos_rtx
= expand_normal (position
);
6093 xtarget
= offset_address (target
, pos_rtx
,
6094 highest_pow2_factor (position
));
6095 xtarget
= adjust_address (xtarget
, mode
, 0);
6096 if (TREE_CODE (value
) == CONSTRUCTOR
)
6097 store_constructor (value
, xtarget
, cleared
,
6098 bitsize
/ BITS_PER_UNIT
);
6100 store_expr (value
, xtarget
, 0, false);
6102 /* Generate a conditional jump to exit the loop. */
6103 exit_cond
= build2 (LT_EXPR
, integer_type_node
,
6105 jumpif (exit_cond
, loop_end
, -1);
6107 /* Update the loop counter, and jump to the head of
6109 expand_assignment (index
,
6110 build2 (PLUS_EXPR
, TREE_TYPE (index
),
6111 index
, integer_one_node
),
6114 emit_jump (loop_start
);
6116 /* Build the end of the loop. */
6117 emit_label (loop_end
);
6120 else if ((index
!= 0 && ! host_integerp (index
, 0))
6121 || ! host_integerp (TYPE_SIZE (elttype
), 1))
6126 index
= ssize_int (1);
6129 index
= fold_convert (ssizetype
,
6130 fold_build2 (MINUS_EXPR
,
6133 TYPE_MIN_VALUE (domain
)));
6136 size_binop (MULT_EXPR
, index
,
6137 fold_convert (ssizetype
,
6138 TYPE_SIZE_UNIT (elttype
)));
6139 xtarget
= offset_address (target
,
6140 expand_normal (position
),
6141 highest_pow2_factor (position
));
6142 xtarget
= adjust_address (xtarget
, mode
, 0);
6143 store_expr (value
, xtarget
, 0, false);
6148 bitpos
= ((tree_low_cst (index
, 0) - minelt
)
6149 * tree_low_cst (TYPE_SIZE (elttype
), 1));
6151 bitpos
= (i
* tree_low_cst (TYPE_SIZE (elttype
), 1));
6153 if (MEM_P (target
) && !MEM_KEEP_ALIAS_SET_P (target
)
6154 && TREE_CODE (type
) == ARRAY_TYPE
6155 && TYPE_NONALIASED_COMPONENT (type
))
6157 target
= copy_rtx (target
);
6158 MEM_KEEP_ALIAS_SET_P (target
) = 1;
6160 store_constructor_field (target
, bitsize
, bitpos
, mode
, value
,
6161 type
, cleared
, get_alias_set (elttype
));
6169 unsigned HOST_WIDE_INT idx
;
6170 constructor_elt
*ce
;
6174 tree elttype
= TREE_TYPE (type
);
6175 int elt_size
= tree_low_cst (TYPE_SIZE (elttype
), 1);
6176 enum machine_mode eltmode
= TYPE_MODE (elttype
);
6177 HOST_WIDE_INT bitsize
;
6178 HOST_WIDE_INT bitpos
;
6179 rtvec vector
= NULL
;
6181 alias_set_type alias
;
6183 gcc_assert (eltmode
!= BLKmode
);
6185 n_elts
= TYPE_VECTOR_SUBPARTS (type
);
6186 if (REG_P (target
) && VECTOR_MODE_P (GET_MODE (target
)))
6188 enum machine_mode mode
= GET_MODE (target
);
6190 icode
= (int) optab_handler (vec_init_optab
, mode
);
6191 if (icode
!= CODE_FOR_nothing
)
6195 vector
= rtvec_alloc (n_elts
);
6196 for (i
= 0; i
< n_elts
; i
++)
6197 RTVEC_ELT (vector
, i
) = CONST0_RTX (GET_MODE_INNER (mode
));
6201 /* If the constructor has fewer elements than the vector,
6202 clear the whole array first. Similarly if this is static
6203 constructor of a non-BLKmode object. */
6206 else if (REG_P (target
) && TREE_STATIC (exp
))
6210 unsigned HOST_WIDE_INT count
= 0, zero_count
= 0;
6213 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
6215 int n_elts_here
= tree_low_cst
6216 (int_const_binop (TRUNC_DIV_EXPR
,
6217 TYPE_SIZE (TREE_TYPE (value
)),
6218 TYPE_SIZE (elttype
)), 1);
6220 count
+= n_elts_here
;
6221 if (mostly_zeros_p (value
))
6222 zero_count
+= n_elts_here
;
6225 /* Clear the entire vector first if there are any missing elements,
6226 or if the incidence of zero elements is >= 75%. */
6227 need_to_clear
= (count
< n_elts
|| 4 * zero_count
>= 3 * count
);
6230 if (need_to_clear
&& size
> 0 && !vector
)
6233 emit_move_insn (target
, CONST0_RTX (GET_MODE (target
)));
6235 clear_storage (target
, GEN_INT (size
), BLOCK_OP_NORMAL
);
6239 /* Inform later passes that the old value is dead. */
6240 if (!cleared
&& !vector
&& REG_P (target
))
6241 emit_move_insn (target
, CONST0_RTX (GET_MODE (target
)));
6244 alias
= MEM_ALIAS_SET (target
);
6246 alias
= get_alias_set (elttype
);
6248 /* Store each element of the constructor into the corresponding
6249 element of TARGET, determined by counting the elements. */
6250 for (idx
= 0, i
= 0;
6251 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), idx
, ce
);
6252 idx
++, i
+= bitsize
/ elt_size
)
6254 HOST_WIDE_INT eltpos
;
6255 tree value
= ce
->value
;
6257 bitsize
= tree_low_cst (TYPE_SIZE (TREE_TYPE (value
)), 1);
6258 if (cleared
&& initializer_zerop (value
))
6262 eltpos
= tree_low_cst (ce
->index
, 1);
6268 /* Vector CONSTRUCTORs should only be built from smaller
6269 vectors in the case of BLKmode vectors. */
6270 gcc_assert (TREE_CODE (TREE_TYPE (value
)) != VECTOR_TYPE
);
6271 RTVEC_ELT (vector
, eltpos
)
6272 = expand_normal (value
);
6276 enum machine_mode value_mode
=
6277 TREE_CODE (TREE_TYPE (value
)) == VECTOR_TYPE
6278 ? TYPE_MODE (TREE_TYPE (value
))
6280 bitpos
= eltpos
* elt_size
;
6281 store_constructor_field (target
, bitsize
, bitpos
,
6282 value_mode
, value
, type
,
6288 emit_insn (GEN_FCN (icode
)
6290 gen_rtx_PARALLEL (GET_MODE (target
), vector
)));
6299 /* Store the value of EXP (an expression tree)
6300 into a subfield of TARGET which has mode MODE and occupies
6301 BITSIZE bits, starting BITPOS bits from the start of TARGET.
6302 If MODE is VOIDmode, it means that we are storing into a bit-field.
6304 BITREGION_START is bitpos of the first bitfield in this region.
6305 BITREGION_END is the bitpos of the ending bitfield in this region.
6306 These two fields are 0, if the C++ memory model does not apply,
6307 or we are not interested in keeping track of bitfield regions.
6309 Always return const0_rtx unless we have something particular to
6312 TYPE is the type of the underlying object,
6314 ALIAS_SET is the alias set for the destination. This value will
6315 (in general) be different from that for TARGET, since TARGET is a
6316 reference to the containing structure.
6318 If NONTEMPORAL is true, try generating a nontemporal store. */
6321 store_field (rtx target
, HOST_WIDE_INT bitsize
, HOST_WIDE_INT bitpos
,
6322 unsigned HOST_WIDE_INT bitregion_start
,
6323 unsigned HOST_WIDE_INT bitregion_end
,
6324 enum machine_mode mode
, tree exp
, tree type
,
6325 alias_set_type alias_set
, bool nontemporal
)
6327 if (TREE_CODE (exp
) == ERROR_MARK
)
6330 /* If we have nothing to store, do nothing unless the expression has
6333 return expand_expr (exp
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
6335 /* If we are storing into an unaligned field of an aligned union that is
6336 in a register, we may have the mode of TARGET being an integer mode but
6337 MODE == BLKmode. In that case, get an aligned object whose size and
6338 alignment are the same as TARGET and store TARGET into it (we can avoid
6339 the store if the field being stored is the entire width of TARGET). Then
6340 call ourselves recursively to store the field into a BLKmode version of
6341 that object. Finally, load from the object into TARGET. This is not
6342 very efficient in general, but should only be slightly more expensive
6343 than the otherwise-required unaligned accesses. Perhaps this can be
6344 cleaned up later. It's tempting to make OBJECT readonly, but it's set
6345 twice, once with emit_move_insn and once via store_field. */
6348 && (REG_P (target
) || GET_CODE (target
) == SUBREG
))
6350 rtx object
= assign_temp (type
, 0, 1, 1);
6351 rtx blk_object
= adjust_address (object
, BLKmode
, 0);
6353 if (bitsize
!= (HOST_WIDE_INT
) GET_MODE_BITSIZE (GET_MODE (target
)))
6354 emit_move_insn (object
, target
);
6356 store_field (blk_object
, bitsize
, bitpos
,
6357 bitregion_start
, bitregion_end
,
6358 mode
, exp
, type
, MEM_ALIAS_SET (blk_object
), nontemporal
);
6360 emit_move_insn (target
, object
);
6362 /* We want to return the BLKmode version of the data. */
6366 if (GET_CODE (target
) == CONCAT
)
6368 /* We're storing into a struct containing a single __complex. */
6370 gcc_assert (!bitpos
);
6371 return store_expr (exp
, target
, 0, nontemporal
);
6374 /* If the structure is in a register or if the component
6375 is a bit field, we cannot use addressing to access it.
6376 Use bit-field techniques or SUBREG to store in it. */
6378 if (mode
== VOIDmode
6379 || (mode
!= BLKmode
&& ! direct_store
[(int) mode
]
6380 && GET_MODE_CLASS (mode
) != MODE_COMPLEX_INT
6381 && GET_MODE_CLASS (mode
) != MODE_COMPLEX_FLOAT
)
6383 || GET_CODE (target
) == SUBREG
6384 /* If the field isn't aligned enough to store as an ordinary memref,
6385 store it as a bit field. */
6387 && ((((MEM_ALIGN (target
) < GET_MODE_ALIGNMENT (mode
))
6388 || bitpos
% GET_MODE_ALIGNMENT (mode
))
6389 && SLOW_UNALIGNED_ACCESS (mode
, MEM_ALIGN (target
)))
6390 || (bitpos
% BITS_PER_UNIT
!= 0)))
6391 || (bitsize
>= 0 && mode
!= BLKmode
6392 && GET_MODE_BITSIZE (mode
) > bitsize
)
6393 /* If the RHS and field are a constant size and the size of the
6394 RHS isn't the same size as the bitfield, we must use bitfield
6397 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp
))) == INTEGER_CST
6398 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp
)), bitsize
) != 0)
6399 /* If we are expanding a MEM_REF of a non-BLKmode non-addressable
6400 decl we must use bitfield operations. */
6402 && TREE_CODE (exp
) == MEM_REF
6403 && TREE_CODE (TREE_OPERAND (exp
, 0)) == ADDR_EXPR
6404 && DECL_P (TREE_OPERAND (TREE_OPERAND (exp
, 0), 0))
6405 && !TREE_ADDRESSABLE (TREE_OPERAND (TREE_OPERAND (exp
, 0),0 ))
6406 && DECL_MODE (TREE_OPERAND (TREE_OPERAND (exp
, 0), 0)) != BLKmode
))
6411 /* If EXP is a NOP_EXPR of precision less than its mode, then that
6412 implies a mask operation. If the precision is the same size as
6413 the field we're storing into, that mask is redundant. This is
6414 particularly common with bit field assignments generated by the
6416 nop_def
= get_def_for_expr (exp
, NOP_EXPR
);
6419 tree type
= TREE_TYPE (exp
);
6420 if (INTEGRAL_TYPE_P (type
)
6421 && TYPE_PRECISION (type
) < GET_MODE_BITSIZE (TYPE_MODE (type
))
6422 && bitsize
== TYPE_PRECISION (type
))
6424 tree op
= gimple_assign_rhs1 (nop_def
);
6425 type
= TREE_TYPE (op
);
6426 if (INTEGRAL_TYPE_P (type
) && TYPE_PRECISION (type
) >= bitsize
)
6431 temp
= expand_normal (exp
);
6433 /* If BITSIZE is narrower than the size of the type of EXP
6434 we will be narrowing TEMP. Normally, what's wanted are the
6435 low-order bits. However, if EXP's type is a record and this is
6436 big-endian machine, we want the upper BITSIZE bits. */
6437 if (BYTES_BIG_ENDIAN
&& GET_MODE_CLASS (GET_MODE (temp
)) == MODE_INT
6438 && bitsize
< (HOST_WIDE_INT
) GET_MODE_BITSIZE (GET_MODE (temp
))
6439 && TREE_CODE (TREE_TYPE (exp
)) == RECORD_TYPE
)
6440 temp
= expand_shift (RSHIFT_EXPR
, GET_MODE (temp
), temp
,
6441 GET_MODE_BITSIZE (GET_MODE (temp
)) - bitsize
,
6444 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
6446 if (mode
!= VOIDmode
&& mode
!= BLKmode
6447 && mode
!= TYPE_MODE (TREE_TYPE (exp
)))
6448 temp
= convert_modes (mode
, TYPE_MODE (TREE_TYPE (exp
)), temp
, 1);
6450 /* If the modes of TEMP and TARGET are both BLKmode, both
6451 must be in memory and BITPOS must be aligned on a byte
6452 boundary. If so, we simply do a block copy. Likewise
6453 for a BLKmode-like TARGET. */
6454 if (GET_MODE (temp
) == BLKmode
6455 && (GET_MODE (target
) == BLKmode
6457 && GET_MODE_CLASS (GET_MODE (target
)) == MODE_INT
6458 && (bitpos
% BITS_PER_UNIT
) == 0
6459 && (bitsize
% BITS_PER_UNIT
) == 0)))
6461 gcc_assert (MEM_P (target
) && MEM_P (temp
)
6462 && (bitpos
% BITS_PER_UNIT
) == 0);
6464 target
= adjust_address (target
, VOIDmode
, bitpos
/ BITS_PER_UNIT
);
6465 emit_block_move (target
, temp
,
6466 GEN_INT ((bitsize
+ BITS_PER_UNIT
- 1)
6473 /* Store the value in the bitfield. */
6474 store_bit_field (target
, bitsize
, bitpos
,
6475 bitregion_start
, bitregion_end
,
6482 /* Now build a reference to just the desired component. */
6483 rtx to_rtx
= adjust_address (target
, mode
, bitpos
/ BITS_PER_UNIT
);
6485 if (to_rtx
== target
)
6486 to_rtx
= copy_rtx (to_rtx
);
6488 if (!MEM_KEEP_ALIAS_SET_P (to_rtx
) && MEM_ALIAS_SET (to_rtx
) != 0)
6489 set_mem_alias_set (to_rtx
, alias_set
);
6491 return store_expr (exp
, to_rtx
, 0, nontemporal
);
6495 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
6496 an ARRAY_REF, or an ARRAY_RANGE_REF, look for nested operations of these
6497 codes and find the ultimate containing object, which we return.
6499 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
6500 bit position, and *PUNSIGNEDP to the signedness of the field.
6501 If the position of the field is variable, we store a tree
6502 giving the variable offset (in units) in *POFFSET.
6503 This offset is in addition to the bit position.
6504 If the position is not variable, we store 0 in *POFFSET.
6506 If any of the extraction expressions is volatile,
6507 we store 1 in *PVOLATILEP. Otherwise we don't change that.
6509 If the field is a non-BLKmode bit-field, *PMODE is set to VOIDmode.
6510 Otherwise, it is a mode that can be used to access the field.
6512 If the field describes a variable-sized object, *PMODE is set to
6513 BLKmode and *PBITSIZE is set to -1. An access cannot be made in
6514 this case, but the address of the object can be found.
6516 If KEEP_ALIGNING is true and the target is STRICT_ALIGNMENT, we don't
6517 look through nodes that serve as markers of a greater alignment than
6518 the one that can be deduced from the expression. These nodes make it
6519 possible for front-ends to prevent temporaries from being created by
6520 the middle-end on alignment considerations. For that purpose, the
6521 normal operating mode at high-level is to always pass FALSE so that
6522 the ultimate containing object is really returned; moreover, the
6523 associated predicate handled_component_p will always return TRUE
6524 on these nodes, thus indicating that they are essentially handled
6525 by get_inner_reference. TRUE should only be passed when the caller
6526 is scanning the expression in order to build another representation
6527 and specifically knows how to handle these nodes; as such, this is
6528 the normal operating mode in the RTL expanders. */
6531 get_inner_reference (tree exp
, HOST_WIDE_INT
*pbitsize
,
6532 HOST_WIDE_INT
*pbitpos
, tree
*poffset
,
6533 enum machine_mode
*pmode
, int *punsignedp
,
6534 int *pvolatilep
, bool keep_aligning
)
6537 enum machine_mode mode
= VOIDmode
;
6538 bool blkmode_bitfield
= false;
6539 tree offset
= size_zero_node
;
6540 double_int bit_offset
= double_int_zero
;
6542 /* First get the mode, signedness, and size. We do this from just the
6543 outermost expression. */
6545 if (TREE_CODE (exp
) == COMPONENT_REF
)
6547 tree field
= TREE_OPERAND (exp
, 1);
6548 size_tree
= DECL_SIZE (field
);
6549 if (!DECL_BIT_FIELD (field
))
6550 mode
= DECL_MODE (field
);
6551 else if (DECL_MODE (field
) == BLKmode
)
6552 blkmode_bitfield
= true;
6553 else if (TREE_THIS_VOLATILE (exp
)
6554 && flag_strict_volatile_bitfields
> 0)
6555 /* Volatile bitfields should be accessed in the mode of the
6556 field's type, not the mode computed based on the bit
6558 mode
= TYPE_MODE (DECL_BIT_FIELD_TYPE (field
));
6560 *punsignedp
= DECL_UNSIGNED (field
);
6562 else if (TREE_CODE (exp
) == BIT_FIELD_REF
)
6564 size_tree
= TREE_OPERAND (exp
, 1);
6565 *punsignedp
= (! INTEGRAL_TYPE_P (TREE_TYPE (exp
))
6566 || TYPE_UNSIGNED (TREE_TYPE (exp
)));
6568 /* For vector types, with the correct size of access, use the mode of
6570 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp
, 0))) == VECTOR_TYPE
6571 && TREE_TYPE (exp
) == TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp
, 0)))
6572 && tree_int_cst_equal (size_tree
, TYPE_SIZE (TREE_TYPE (exp
))))
6573 mode
= TYPE_MODE (TREE_TYPE (exp
));
6577 mode
= TYPE_MODE (TREE_TYPE (exp
));
6578 *punsignedp
= TYPE_UNSIGNED (TREE_TYPE (exp
));
6580 if (mode
== BLKmode
)
6581 size_tree
= TYPE_SIZE (TREE_TYPE (exp
));
6583 *pbitsize
= GET_MODE_BITSIZE (mode
);
6588 if (! host_integerp (size_tree
, 1))
6589 mode
= BLKmode
, *pbitsize
= -1;
6591 *pbitsize
= tree_low_cst (size_tree
, 1);
6594 /* Compute cumulative bit-offset for nested component-refs and array-refs,
6595 and find the ultimate containing object. */
6598 switch (TREE_CODE (exp
))
6602 = double_int_add (bit_offset
,
6603 tree_to_double_int (TREE_OPERAND (exp
, 2)));
6608 tree field
= TREE_OPERAND (exp
, 1);
6609 tree this_offset
= component_ref_field_offset (exp
);
6611 /* If this field hasn't been filled in yet, don't go past it.
6612 This should only happen when folding expressions made during
6613 type construction. */
6614 if (this_offset
== 0)
6617 offset
= size_binop (PLUS_EXPR
, offset
, this_offset
);
6618 bit_offset
= double_int_add (bit_offset
,
6620 (DECL_FIELD_BIT_OFFSET (field
)));
6622 /* ??? Right now we don't do anything with DECL_OFFSET_ALIGN. */
6627 case ARRAY_RANGE_REF
:
6629 tree index
= TREE_OPERAND (exp
, 1);
6630 tree low_bound
= array_ref_low_bound (exp
);
6631 tree unit_size
= array_ref_element_size (exp
);
6633 /* We assume all arrays have sizes that are a multiple of a byte.
6634 First subtract the lower bound, if any, in the type of the
6635 index, then convert to sizetype and multiply by the size of
6636 the array element. */
6637 if (! integer_zerop (low_bound
))
6638 index
= fold_build2 (MINUS_EXPR
, TREE_TYPE (index
),
6641 offset
= size_binop (PLUS_EXPR
, offset
,
6642 size_binop (MULT_EXPR
,
6643 fold_convert (sizetype
, index
),
6652 bit_offset
= double_int_add (bit_offset
,
6653 uhwi_to_double_int (*pbitsize
));
6656 case VIEW_CONVERT_EXPR
:
6657 if (keep_aligning
&& STRICT_ALIGNMENT
6658 && (TYPE_ALIGN (TREE_TYPE (exp
))
6659 > TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp
, 0))))
6660 && (TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp
, 0)))
6661 < BIGGEST_ALIGNMENT
)
6662 && (TYPE_ALIGN_OK (TREE_TYPE (exp
))
6663 || TYPE_ALIGN_OK (TREE_TYPE (TREE_OPERAND (exp
, 0)))))
6668 /* Hand back the decl for MEM[&decl, off]. */
6669 if (TREE_CODE (TREE_OPERAND (exp
, 0)) == ADDR_EXPR
)
6671 tree off
= TREE_OPERAND (exp
, 1);
6672 if (!integer_zerop (off
))
6674 double_int boff
, coff
= mem_ref_offset (exp
);
6675 boff
= double_int_lshift (coff
,
6677 ? 3 : exact_log2 (BITS_PER_UNIT
),
6678 HOST_BITS_PER_DOUBLE_INT
, true);
6679 bit_offset
= double_int_add (bit_offset
, boff
);
6681 exp
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
6689 /* If any reference in the chain is volatile, the effect is volatile. */
6690 if (TREE_THIS_VOLATILE (exp
))
6693 exp
= TREE_OPERAND (exp
, 0);
6697 /* If OFFSET is constant, see if we can return the whole thing as a
6698 constant bit position. Make sure to handle overflow during
6700 if (TREE_CODE (offset
) == INTEGER_CST
)
6702 double_int tem
= tree_to_double_int (offset
);
6703 tem
= double_int_sext (tem
, TYPE_PRECISION (sizetype
));
6704 tem
= double_int_lshift (tem
,
6706 ? 3 : exact_log2 (BITS_PER_UNIT
),
6707 HOST_BITS_PER_DOUBLE_INT
, true);
6708 tem
= double_int_add (tem
, bit_offset
);
6709 if (double_int_fits_in_shwi_p (tem
))
6711 *pbitpos
= double_int_to_shwi (tem
);
6712 *poffset
= offset
= NULL_TREE
;
6716 /* Otherwise, split it up. */
6719 /* Avoid returning a negative bitpos as this may wreak havoc later. */
6720 if (double_int_negative_p (bit_offset
))
6723 = double_int_mask (BITS_PER_UNIT
== 8
6724 ? 3 : exact_log2 (BITS_PER_UNIT
));
6725 double_int tem
= double_int_and_not (bit_offset
, mask
);
6726 /* TEM is the bitpos rounded to BITS_PER_UNIT towards -Inf.
6727 Subtract it to BIT_OFFSET and add it (scaled) to OFFSET. */
6728 bit_offset
= double_int_sub (bit_offset
, tem
);
6729 tem
= double_int_rshift (tem
,
6731 ? 3 : exact_log2 (BITS_PER_UNIT
),
6732 HOST_BITS_PER_DOUBLE_INT
, true);
6733 offset
= size_binop (PLUS_EXPR
, offset
,
6734 double_int_to_tree (sizetype
, tem
));
6737 *pbitpos
= double_int_to_shwi (bit_offset
);
6741 /* We can use BLKmode for a byte-aligned BLKmode bitfield. */
6742 if (mode
== VOIDmode
6744 && (*pbitpos
% BITS_PER_UNIT
) == 0
6745 && (*pbitsize
% BITS_PER_UNIT
) == 0)
6753 /* Given an expression EXP that may be a COMPONENT_REF, an ARRAY_REF or an
6754 ARRAY_RANGE_REF, look for whether EXP or any nested component-refs within
6755 EXP is marked as PACKED. */
6758 contains_packed_reference (const_tree exp
)
6760 bool packed_p
= false;
6764 switch (TREE_CODE (exp
))
6768 tree field
= TREE_OPERAND (exp
, 1);
6769 packed_p
= DECL_PACKED (field
)
6770 || TYPE_PACKED (TREE_TYPE (field
))
6771 || TYPE_PACKED (TREE_TYPE (exp
));
6779 case ARRAY_RANGE_REF
:
6782 case VIEW_CONVERT_EXPR
:
6788 exp
= TREE_OPERAND (exp
, 0);
6794 /* Return a tree of sizetype representing the size, in bytes, of the element
6795 of EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6798 array_ref_element_size (tree exp
)
6800 tree aligned_size
= TREE_OPERAND (exp
, 3);
6801 tree elmt_type
= TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp
, 0)));
6802 location_t loc
= EXPR_LOCATION (exp
);
6804 /* If a size was specified in the ARRAY_REF, it's the size measured
6805 in alignment units of the element type. So multiply by that value. */
6808 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6809 sizetype from another type of the same width and signedness. */
6810 if (TREE_TYPE (aligned_size
) != sizetype
)
6811 aligned_size
= fold_convert_loc (loc
, sizetype
, aligned_size
);
6812 return size_binop_loc (loc
, MULT_EXPR
, aligned_size
,
6813 size_int (TYPE_ALIGN_UNIT (elmt_type
)));
6816 /* Otherwise, take the size from that of the element type. Substitute
6817 any PLACEHOLDER_EXPR that we have. */
6819 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (elmt_type
), exp
);
6822 /* Return a tree representing the lower bound of the array mentioned in
6823 EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6826 array_ref_low_bound (tree exp
)
6828 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp
, 0)));
6830 /* If a lower bound is specified in EXP, use it. */
6831 if (TREE_OPERAND (exp
, 2))
6832 return TREE_OPERAND (exp
, 2);
6834 /* Otherwise, if there is a domain type and it has a lower bound, use it,
6835 substituting for a PLACEHOLDER_EXPR as needed. */
6836 if (domain_type
&& TYPE_MIN_VALUE (domain_type
))
6837 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MIN_VALUE (domain_type
), exp
);
6839 /* Otherwise, return a zero of the appropriate type. */
6840 return build_int_cst (TREE_TYPE (TREE_OPERAND (exp
, 1)), 0);
6843 /* Return a tree representing the upper bound of the array mentioned in
6844 EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6847 array_ref_up_bound (tree exp
)
6849 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp
, 0)));
6851 /* If there is a domain type and it has an upper bound, use it, substituting
6852 for a PLACEHOLDER_EXPR as needed. */
6853 if (domain_type
&& TYPE_MAX_VALUE (domain_type
))
6854 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MAX_VALUE (domain_type
), exp
);
6856 /* Otherwise fail. */
6860 /* Return a tree representing the offset, in bytes, of the field referenced
6861 by EXP. This does not include any offset in DECL_FIELD_BIT_OFFSET. */
6864 component_ref_field_offset (tree exp
)
6866 tree aligned_offset
= TREE_OPERAND (exp
, 2);
6867 tree field
= TREE_OPERAND (exp
, 1);
6868 location_t loc
= EXPR_LOCATION (exp
);
6870 /* If an offset was specified in the COMPONENT_REF, it's the offset measured
6871 in units of DECL_OFFSET_ALIGN / BITS_PER_UNIT. So multiply by that
6875 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6876 sizetype from another type of the same width and signedness. */
6877 if (TREE_TYPE (aligned_offset
) != sizetype
)
6878 aligned_offset
= fold_convert_loc (loc
, sizetype
, aligned_offset
);
6879 return size_binop_loc (loc
, MULT_EXPR
, aligned_offset
,
6880 size_int (DECL_OFFSET_ALIGN (field
)
6884 /* Otherwise, take the offset from that of the field. Substitute
6885 any PLACEHOLDER_EXPR that we have. */
6887 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_FIELD_OFFSET (field
), exp
);
6890 /* Alignment in bits the TARGET of an assignment may be assumed to have. */
6892 static unsigned HOST_WIDE_INT
6893 target_align (const_tree target
)
6895 /* We might have a chain of nested references with intermediate misaligning
6896 bitfields components, so need to recurse to find out. */
6898 unsigned HOST_WIDE_INT this_align
, outer_align
;
6900 switch (TREE_CODE (target
))
6906 this_align
= DECL_ALIGN (TREE_OPERAND (target
, 1));
6907 outer_align
= target_align (TREE_OPERAND (target
, 0));
6908 return MIN (this_align
, outer_align
);
6911 case ARRAY_RANGE_REF
:
6912 this_align
= TYPE_ALIGN (TREE_TYPE (target
));
6913 outer_align
= target_align (TREE_OPERAND (target
, 0));
6914 return MIN (this_align
, outer_align
);
6917 case NON_LVALUE_EXPR
:
6918 case VIEW_CONVERT_EXPR
:
6919 this_align
= TYPE_ALIGN (TREE_TYPE (target
));
6920 outer_align
= target_align (TREE_OPERAND (target
, 0));
6921 return MAX (this_align
, outer_align
);
6924 return TYPE_ALIGN (TREE_TYPE (target
));
6929 /* Given an rtx VALUE that may contain additions and multiplications, return
6930 an equivalent value that just refers to a register, memory, or constant.
6931 This is done by generating instructions to perform the arithmetic and
6932 returning a pseudo-register containing the value.
6934 The returned value may be a REG, SUBREG, MEM or constant. */
6937 force_operand (rtx value
, rtx target
)
6940 /* Use subtarget as the target for operand 0 of a binary operation. */
6941 rtx subtarget
= get_subtarget (target
);
6942 enum rtx_code code
= GET_CODE (value
);
6944 /* Check for subreg applied to an expression produced by loop optimizer. */
6946 && !REG_P (SUBREG_REG (value
))
6947 && !MEM_P (SUBREG_REG (value
)))
6950 = simplify_gen_subreg (GET_MODE (value
),
6951 force_reg (GET_MODE (SUBREG_REG (value
)),
6952 force_operand (SUBREG_REG (value
),
6954 GET_MODE (SUBREG_REG (value
)),
6955 SUBREG_BYTE (value
));
6956 code
= GET_CODE (value
);
6959 /* Check for a PIC address load. */
6960 if ((code
== PLUS
|| code
== MINUS
)
6961 && XEXP (value
, 0) == pic_offset_table_rtx
6962 && (GET_CODE (XEXP (value
, 1)) == SYMBOL_REF
6963 || GET_CODE (XEXP (value
, 1)) == LABEL_REF
6964 || GET_CODE (XEXP (value
, 1)) == CONST
))
6967 subtarget
= gen_reg_rtx (GET_MODE (value
));
6968 emit_move_insn (subtarget
, value
);
6972 if (ARITHMETIC_P (value
))
6974 op2
= XEXP (value
, 1);
6975 if (!CONSTANT_P (op2
) && !(REG_P (op2
) && op2
!= subtarget
))
6977 if (code
== MINUS
&& CONST_INT_P (op2
))
6980 op2
= negate_rtx (GET_MODE (value
), op2
);
6983 /* Check for an addition with OP2 a constant integer and our first
6984 operand a PLUS of a virtual register and something else. In that
6985 case, we want to emit the sum of the virtual register and the
6986 constant first and then add the other value. This allows virtual
6987 register instantiation to simply modify the constant rather than
6988 creating another one around this addition. */
6989 if (code
== PLUS
&& CONST_INT_P (op2
)
6990 && GET_CODE (XEXP (value
, 0)) == PLUS
6991 && REG_P (XEXP (XEXP (value
, 0), 0))
6992 && REGNO (XEXP (XEXP (value
, 0), 0)) >= FIRST_VIRTUAL_REGISTER
6993 && REGNO (XEXP (XEXP (value
, 0), 0)) <= LAST_VIRTUAL_REGISTER
)
6995 rtx temp
= expand_simple_binop (GET_MODE (value
), code
,
6996 XEXP (XEXP (value
, 0), 0), op2
,
6997 subtarget
, 0, OPTAB_LIB_WIDEN
);
6998 return expand_simple_binop (GET_MODE (value
), code
, temp
,
6999 force_operand (XEXP (XEXP (value
,
7001 target
, 0, OPTAB_LIB_WIDEN
);
7004 op1
= force_operand (XEXP (value
, 0), subtarget
);
7005 op2
= force_operand (op2
, NULL_RTX
);
7009 return expand_mult (GET_MODE (value
), op1
, op2
, target
, 1);
7011 if (!INTEGRAL_MODE_P (GET_MODE (value
)))
7012 return expand_simple_binop (GET_MODE (value
), code
, op1
, op2
,
7013 target
, 1, OPTAB_LIB_WIDEN
);
7015 return expand_divmod (0,
7016 FLOAT_MODE_P (GET_MODE (value
))
7017 ? RDIV_EXPR
: TRUNC_DIV_EXPR
,
7018 GET_MODE (value
), op1
, op2
, target
, 0);
7020 return expand_divmod (1, TRUNC_MOD_EXPR
, GET_MODE (value
), op1
, op2
,
7023 return expand_divmod (0, TRUNC_DIV_EXPR
, GET_MODE (value
), op1
, op2
,
7026 return expand_divmod (1, TRUNC_MOD_EXPR
, GET_MODE (value
), op1
, op2
,
7029 return expand_simple_binop (GET_MODE (value
), code
, op1
, op2
,
7030 target
, 0, OPTAB_LIB_WIDEN
);
7032 return expand_simple_binop (GET_MODE (value
), code
, op1
, op2
,
7033 target
, 1, OPTAB_LIB_WIDEN
);
7036 if (UNARY_P (value
))
7039 target
= gen_reg_rtx (GET_MODE (value
));
7040 op1
= force_operand (XEXP (value
, 0), NULL_RTX
);
7047 case FLOAT_TRUNCATE
:
7048 convert_move (target
, op1
, code
== ZERO_EXTEND
);
7053 expand_fix (target
, op1
, code
== UNSIGNED_FIX
);
7057 case UNSIGNED_FLOAT
:
7058 expand_float (target
, op1
, code
== UNSIGNED_FLOAT
);
7062 return expand_simple_unop (GET_MODE (value
), code
, op1
, target
, 0);
7066 #ifdef INSN_SCHEDULING
7067 /* On machines that have insn scheduling, we want all memory reference to be
7068 explicit, so we need to deal with such paradoxical SUBREGs. */
7069 if (paradoxical_subreg_p (value
) && MEM_P (SUBREG_REG (value
)))
7071 = simplify_gen_subreg (GET_MODE (value
),
7072 force_reg (GET_MODE (SUBREG_REG (value
)),
7073 force_operand (SUBREG_REG (value
),
7075 GET_MODE (SUBREG_REG (value
)),
7076 SUBREG_BYTE (value
));
7082 /* Subroutine of expand_expr: return nonzero iff there is no way that
7083 EXP can reference X, which is being modified. TOP_P is nonzero if this
7084 call is going to be used to determine whether we need a temporary
7085 for EXP, as opposed to a recursive call to this function.
7087 It is always safe for this routine to return zero since it merely
7088 searches for optimization opportunities. */
7091 safe_from_p (const_rtx x
, tree exp
, int top_p
)
7097 /* If EXP has varying size, we MUST use a target since we currently
7098 have no way of allocating temporaries of variable size
7099 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
7100 So we assume here that something at a higher level has prevented a
7101 clash. This is somewhat bogus, but the best we can do. Only
7102 do this when X is BLKmode and when we are at the top level. */
7103 || (top_p
&& TREE_TYPE (exp
) != 0 && COMPLETE_TYPE_P (TREE_TYPE (exp
))
7104 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp
))) != INTEGER_CST
7105 && (TREE_CODE (TREE_TYPE (exp
)) != ARRAY_TYPE
7106 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp
)) == NULL_TREE
7107 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp
)))
7109 && GET_MODE (x
) == BLKmode
)
7110 /* If X is in the outgoing argument area, it is always safe. */
7112 && (XEXP (x
, 0) == virtual_outgoing_args_rtx
7113 || (GET_CODE (XEXP (x
, 0)) == PLUS
7114 && XEXP (XEXP (x
, 0), 0) == virtual_outgoing_args_rtx
))))
7117 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
7118 find the underlying pseudo. */
7119 if (GET_CODE (x
) == SUBREG
)
7122 if (REG_P (x
) && REGNO (x
) < FIRST_PSEUDO_REGISTER
)
7126 /* Now look at our tree code and possibly recurse. */
7127 switch (TREE_CODE_CLASS (TREE_CODE (exp
)))
7129 case tcc_declaration
:
7130 exp_rtl
= DECL_RTL_IF_SET (exp
);
7136 case tcc_exceptional
:
7137 if (TREE_CODE (exp
) == TREE_LIST
)
7141 if (TREE_VALUE (exp
) && !safe_from_p (x
, TREE_VALUE (exp
), 0))
7143 exp
= TREE_CHAIN (exp
);
7146 if (TREE_CODE (exp
) != TREE_LIST
)
7147 return safe_from_p (x
, exp
, 0);
7150 else if (TREE_CODE (exp
) == CONSTRUCTOR
)
7152 constructor_elt
*ce
;
7153 unsigned HOST_WIDE_INT idx
;
7155 FOR_EACH_VEC_ELT (constructor_elt
, CONSTRUCTOR_ELTS (exp
), idx
, ce
)
7156 if ((ce
->index
!= NULL_TREE
&& !safe_from_p (x
, ce
->index
, 0))
7157 || !safe_from_p (x
, ce
->value
, 0))
7161 else if (TREE_CODE (exp
) == ERROR_MARK
)
7162 return 1; /* An already-visited SAVE_EXPR? */
7167 /* The only case we look at here is the DECL_INITIAL inside a
7169 return (TREE_CODE (exp
) != DECL_EXPR
7170 || TREE_CODE (DECL_EXPR_DECL (exp
)) != VAR_DECL
7171 || !DECL_INITIAL (DECL_EXPR_DECL (exp
))
7172 || safe_from_p (x
, DECL_INITIAL (DECL_EXPR_DECL (exp
)), 0));
7175 case tcc_comparison
:
7176 if (!safe_from_p (x
, TREE_OPERAND (exp
, 1), 0))
7181 return safe_from_p (x
, TREE_OPERAND (exp
, 0), 0);
7183 case tcc_expression
:
7186 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
7187 the expression. If it is set, we conflict iff we are that rtx or
7188 both are in memory. Otherwise, we check all operands of the
7189 expression recursively. */
7191 switch (TREE_CODE (exp
))
7194 /* If the operand is static or we are static, we can't conflict.
7195 Likewise if we don't conflict with the operand at all. */
7196 if (staticp (TREE_OPERAND (exp
, 0))
7197 || TREE_STATIC (exp
)
7198 || safe_from_p (x
, TREE_OPERAND (exp
, 0), 0))
7201 /* Otherwise, the only way this can conflict is if we are taking
7202 the address of a DECL a that address if part of X, which is
7204 exp
= TREE_OPERAND (exp
, 0);
7207 if (!DECL_RTL_SET_P (exp
)
7208 || !MEM_P (DECL_RTL (exp
)))
7211 exp_rtl
= XEXP (DECL_RTL (exp
), 0);
7217 && alias_sets_conflict_p (MEM_ALIAS_SET (x
),
7218 get_alias_set (exp
)))
7223 /* Assume that the call will clobber all hard registers and
7225 if ((REG_P (x
) && REGNO (x
) < FIRST_PSEUDO_REGISTER
)
7230 case WITH_CLEANUP_EXPR
:
7231 case CLEANUP_POINT_EXPR
:
7232 /* Lowered by gimplify.c. */
7236 return safe_from_p (x
, TREE_OPERAND (exp
, 0), 0);
7242 /* If we have an rtx, we do not need to scan our operands. */
7246 nops
= TREE_OPERAND_LENGTH (exp
);
7247 for (i
= 0; i
< nops
; i
++)
7248 if (TREE_OPERAND (exp
, i
) != 0
7249 && ! safe_from_p (x
, TREE_OPERAND (exp
, i
), 0))
7255 /* Should never get a type here. */
7259 /* If we have an rtl, find any enclosed object. Then see if we conflict
7263 if (GET_CODE (exp_rtl
) == SUBREG
)
7265 exp_rtl
= SUBREG_REG (exp_rtl
);
7267 && REGNO (exp_rtl
) < FIRST_PSEUDO_REGISTER
)
7271 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
7272 are memory and they conflict. */
7273 return ! (rtx_equal_p (x
, exp_rtl
)
7274 || (MEM_P (x
) && MEM_P (exp_rtl
)
7275 && true_dependence (exp_rtl
, VOIDmode
, x
)));
7278 /* If we reach here, it is safe. */
7283 /* Return the highest power of two that EXP is known to be a multiple of.
7284 This is used in updating alignment of MEMs in array references. */
7286 unsigned HOST_WIDE_INT
7287 highest_pow2_factor (const_tree exp
)
7289 unsigned HOST_WIDE_INT c0
, c1
;
7291 switch (TREE_CODE (exp
))
7294 /* We can find the lowest bit that's a one. If the low
7295 HOST_BITS_PER_WIDE_INT bits are zero, return BIGGEST_ALIGNMENT.
7296 We need to handle this case since we can find it in a COND_EXPR,
7297 a MIN_EXPR, or a MAX_EXPR. If the constant overflows, we have an
7298 erroneous program, so return BIGGEST_ALIGNMENT to avoid any
7300 if (TREE_OVERFLOW (exp
))
7301 return BIGGEST_ALIGNMENT
;
7304 /* Note: tree_low_cst is intentionally not used here,
7305 we don't care about the upper bits. */
7306 c0
= TREE_INT_CST_LOW (exp
);
7308 return c0
? c0
: BIGGEST_ALIGNMENT
;
7312 case PLUS_EXPR
: case MINUS_EXPR
: case MIN_EXPR
: case MAX_EXPR
:
7313 c0
= highest_pow2_factor (TREE_OPERAND (exp
, 0));
7314 c1
= highest_pow2_factor (TREE_OPERAND (exp
, 1));
7315 return MIN (c0
, c1
);
7318 c0
= highest_pow2_factor (TREE_OPERAND (exp
, 0));
7319 c1
= highest_pow2_factor (TREE_OPERAND (exp
, 1));
7322 case ROUND_DIV_EXPR
: case TRUNC_DIV_EXPR
: case FLOOR_DIV_EXPR
:
7324 if (integer_pow2p (TREE_OPERAND (exp
, 1))
7325 && host_integerp (TREE_OPERAND (exp
, 1), 1))
7327 c0
= highest_pow2_factor (TREE_OPERAND (exp
, 0));
7328 c1
= tree_low_cst (TREE_OPERAND (exp
, 1), 1);
7329 return MAX (1, c0
/ c1
);
7334 /* The highest power of two of a bit-and expression is the maximum of
7335 that of its operands. We typically get here for a complex LHS and
7336 a constant negative power of two on the RHS to force an explicit
7337 alignment, so don't bother looking at the LHS. */
7338 return highest_pow2_factor (TREE_OPERAND (exp
, 1));
7342 return highest_pow2_factor (TREE_OPERAND (exp
, 0));
7345 return highest_pow2_factor (TREE_OPERAND (exp
, 1));
7348 c0
= highest_pow2_factor (TREE_OPERAND (exp
, 1));
7349 c1
= highest_pow2_factor (TREE_OPERAND (exp
, 2));
7350 return MIN (c0
, c1
);
7359 /* Similar, except that the alignment requirements of TARGET are
7360 taken into account. Assume it is at least as aligned as its
7361 type, unless it is a COMPONENT_REF in which case the layout of
7362 the structure gives the alignment. */
7364 static unsigned HOST_WIDE_INT
7365 highest_pow2_factor_for_target (const_tree target
, const_tree exp
)
7367 unsigned HOST_WIDE_INT talign
= target_align (target
) / BITS_PER_UNIT
;
7368 unsigned HOST_WIDE_INT factor
= highest_pow2_factor (exp
);
7370 return MAX (factor
, talign
);
7373 /* Subroutine of expand_expr. Expand the two operands of a binary
7374 expression EXP0 and EXP1 placing the results in OP0 and OP1.
7375 The value may be stored in TARGET if TARGET is nonzero. The
7376 MODIFIER argument is as documented by expand_expr. */
7379 expand_operands (tree exp0
, tree exp1
, rtx target
, rtx
*op0
, rtx
*op1
,
7380 enum expand_modifier modifier
)
7382 if (! safe_from_p (target
, exp1
, 1))
7384 if (operand_equal_p (exp0
, exp1
, 0))
7386 *op0
= expand_expr (exp0
, target
, VOIDmode
, modifier
);
7387 *op1
= copy_rtx (*op0
);
7391 /* If we need to preserve evaluation order, copy exp0 into its own
7392 temporary variable so that it can't be clobbered by exp1. */
7393 if (flag_evaluation_order
&& TREE_SIDE_EFFECTS (exp1
))
7394 exp0
= save_expr (exp0
);
7395 *op0
= expand_expr (exp0
, target
, VOIDmode
, modifier
);
7396 *op1
= expand_expr (exp1
, NULL_RTX
, VOIDmode
, modifier
);
7401 /* Return a MEM that contains constant EXP. DEFER is as for
7402 output_constant_def and MODIFIER is as for expand_expr. */
7405 expand_expr_constant (tree exp
, int defer
, enum expand_modifier modifier
)
7409 mem
= output_constant_def (exp
, defer
);
7410 if (modifier
!= EXPAND_INITIALIZER
)
7411 mem
= use_anchored_address (mem
);
7415 /* A subroutine of expand_expr_addr_expr. Evaluate the address of EXP.
7416 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
7419 expand_expr_addr_expr_1 (tree exp
, rtx target
, enum machine_mode tmode
,
7420 enum expand_modifier modifier
, addr_space_t as
)
7422 rtx result
, subtarget
;
7424 HOST_WIDE_INT bitsize
, bitpos
;
7425 int volatilep
, unsignedp
;
7426 enum machine_mode mode1
;
7428 /* If we are taking the address of a constant and are at the top level,
7429 we have to use output_constant_def since we can't call force_const_mem
7431 /* ??? This should be considered a front-end bug. We should not be
7432 generating ADDR_EXPR of something that isn't an LVALUE. The only
7433 exception here is STRING_CST. */
7434 if (CONSTANT_CLASS_P (exp
))
7436 result
= XEXP (expand_expr_constant (exp
, 0, modifier
), 0);
7437 if (modifier
< EXPAND_SUM
)
7438 result
= force_operand (result
, target
);
7442 /* Everything must be something allowed by is_gimple_addressable. */
7443 switch (TREE_CODE (exp
))
7446 /* This case will happen via recursion for &a->b. */
7447 return expand_expr (TREE_OPERAND (exp
, 0), target
, tmode
, modifier
);
7451 tree tem
= TREE_OPERAND (exp
, 0);
7452 if (!integer_zerop (TREE_OPERAND (exp
, 1)))
7453 tem
= fold_build_pointer_plus (tem
, TREE_OPERAND (exp
, 1));
7454 return expand_expr (tem
, target
, tmode
, modifier
);
7458 /* Expand the initializer like constants above. */
7459 result
= XEXP (expand_expr_constant (DECL_INITIAL (exp
),
7461 if (modifier
< EXPAND_SUM
)
7462 result
= force_operand (result
, target
);
7466 /* The real part of the complex number is always first, therefore
7467 the address is the same as the address of the parent object. */
7470 inner
= TREE_OPERAND (exp
, 0);
7474 /* The imaginary part of the complex number is always second.
7475 The expression is therefore always offset by the size of the
7478 bitpos
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (exp
)));
7479 inner
= TREE_OPERAND (exp
, 0);
7483 /* If the object is a DECL, then expand it for its rtl. Don't bypass
7484 expand_expr, as that can have various side effects; LABEL_DECLs for
7485 example, may not have their DECL_RTL set yet. Expand the rtl of
7486 CONSTRUCTORs too, which should yield a memory reference for the
7487 constructor's contents. Assume language specific tree nodes can
7488 be expanded in some interesting way. */
7489 gcc_assert (TREE_CODE (exp
) < LAST_AND_UNUSED_TREE_CODE
);
7491 || TREE_CODE (exp
) == CONSTRUCTOR
7492 || TREE_CODE (exp
) == COMPOUND_LITERAL_EXPR
)
7494 result
= expand_expr (exp
, target
, tmode
,
7495 modifier
== EXPAND_INITIALIZER
7496 ? EXPAND_INITIALIZER
: EXPAND_CONST_ADDRESS
);
7498 /* If the DECL isn't in memory, then the DECL wasn't properly
7499 marked TREE_ADDRESSABLE, which will be either a front-end
7500 or a tree optimizer bug. */
7502 if (TREE_ADDRESSABLE (exp
)
7504 && ! targetm
.calls
.allocate_stack_slots_for_args())
7506 error ("local frame unavailable (naked function?)");
7510 gcc_assert (MEM_P (result
));
7511 result
= XEXP (result
, 0);
7513 /* ??? Is this needed anymore? */
7514 if (DECL_P (exp
) && !TREE_USED (exp
) == 0)
7516 assemble_external (exp
);
7517 TREE_USED (exp
) = 1;
7520 if (modifier
!= EXPAND_INITIALIZER
7521 && modifier
!= EXPAND_CONST_ADDRESS
7522 && modifier
!= EXPAND_SUM
)
7523 result
= force_operand (result
, target
);
7527 /* Pass FALSE as the last argument to get_inner_reference although
7528 we are expanding to RTL. The rationale is that we know how to
7529 handle "aligning nodes" here: we can just bypass them because
7530 they won't change the final object whose address will be returned
7531 (they actually exist only for that purpose). */
7532 inner
= get_inner_reference (exp
, &bitsize
, &bitpos
, &offset
,
7533 &mode1
, &unsignedp
, &volatilep
, false);
7537 /* We must have made progress. */
7538 gcc_assert (inner
!= exp
);
7540 subtarget
= offset
|| bitpos
? NULL_RTX
: target
;
7541 /* For VIEW_CONVERT_EXPR, where the outer alignment is bigger than
7542 inner alignment, force the inner to be sufficiently aligned. */
7543 if (CONSTANT_CLASS_P (inner
)
7544 && TYPE_ALIGN (TREE_TYPE (inner
)) < TYPE_ALIGN (TREE_TYPE (exp
)))
7546 inner
= copy_node (inner
);
7547 TREE_TYPE (inner
) = copy_node (TREE_TYPE (inner
));
7548 TYPE_ALIGN (TREE_TYPE (inner
)) = TYPE_ALIGN (TREE_TYPE (exp
));
7549 TYPE_USER_ALIGN (TREE_TYPE (inner
)) = 1;
7551 result
= expand_expr_addr_expr_1 (inner
, subtarget
, tmode
, modifier
, as
);
7557 if (modifier
!= EXPAND_NORMAL
)
7558 result
= force_operand (result
, NULL
);
7559 tmp
= expand_expr (offset
, NULL_RTX
, tmode
,
7560 modifier
== EXPAND_INITIALIZER
7561 ? EXPAND_INITIALIZER
: EXPAND_NORMAL
);
7563 result
= convert_memory_address_addr_space (tmode
, result
, as
);
7564 tmp
= convert_memory_address_addr_space (tmode
, tmp
, as
);
7566 if (modifier
== EXPAND_SUM
|| modifier
== EXPAND_INITIALIZER
)
7567 result
= simplify_gen_binary (PLUS
, tmode
, result
, tmp
);
7570 subtarget
= bitpos
? NULL_RTX
: target
;
7571 result
= expand_simple_binop (tmode
, PLUS
, result
, tmp
, subtarget
,
7572 1, OPTAB_LIB_WIDEN
);
7578 /* Someone beforehand should have rejected taking the address
7579 of such an object. */
7580 gcc_assert ((bitpos
% BITS_PER_UNIT
) == 0);
7582 result
= plus_constant (result
, bitpos
/ BITS_PER_UNIT
);
7583 if (modifier
< EXPAND_SUM
)
7584 result
= force_operand (result
, target
);
7590 /* A subroutine of expand_expr. Evaluate EXP, which is an ADDR_EXPR.
7591 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
7594 expand_expr_addr_expr (tree exp
, rtx target
, enum machine_mode tmode
,
7595 enum expand_modifier modifier
)
7597 addr_space_t as
= ADDR_SPACE_GENERIC
;
7598 enum machine_mode address_mode
= Pmode
;
7599 enum machine_mode pointer_mode
= ptr_mode
;
7600 enum machine_mode rmode
;
7603 /* Target mode of VOIDmode says "whatever's natural". */
7604 if (tmode
== VOIDmode
)
7605 tmode
= TYPE_MODE (TREE_TYPE (exp
));
7607 if (POINTER_TYPE_P (TREE_TYPE (exp
)))
7609 as
= TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)));
7610 address_mode
= targetm
.addr_space
.address_mode (as
);
7611 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
7614 /* We can get called with some Weird Things if the user does silliness
7615 like "(short) &a". In that case, convert_memory_address won't do
7616 the right thing, so ignore the given target mode. */
7617 if (tmode
!= address_mode
&& tmode
!= pointer_mode
)
7618 tmode
= address_mode
;
7620 result
= expand_expr_addr_expr_1 (TREE_OPERAND (exp
, 0), target
,
7621 tmode
, modifier
, as
);
7623 /* Despite expand_expr claims concerning ignoring TMODE when not
7624 strictly convenient, stuff breaks if we don't honor it. Note
7625 that combined with the above, we only do this for pointer modes. */
7626 rmode
= GET_MODE (result
);
7627 if (rmode
== VOIDmode
)
7630 result
= convert_memory_address_addr_space (tmode
, result
, as
);
7635 /* Generate code for computing CONSTRUCTOR EXP.
7636 An rtx for the computed value is returned. If AVOID_TEMP_MEM
7637 is TRUE, instead of creating a temporary variable in memory
7638 NULL is returned and the caller needs to handle it differently. */
7641 expand_constructor (tree exp
, rtx target
, enum expand_modifier modifier
,
7642 bool avoid_temp_mem
)
7644 tree type
= TREE_TYPE (exp
);
7645 enum machine_mode mode
= TYPE_MODE (type
);
7647 /* Try to avoid creating a temporary at all. This is possible
7648 if all of the initializer is zero.
7649 FIXME: try to handle all [0..255] initializers we can handle
7651 if (TREE_STATIC (exp
)
7652 && !TREE_ADDRESSABLE (exp
)
7653 && target
!= 0 && mode
== BLKmode
7654 && all_zeros_p (exp
))
7656 clear_storage (target
, expr_size (exp
), BLOCK_OP_NORMAL
);
7660 /* All elts simple constants => refer to a constant in memory. But
7661 if this is a non-BLKmode mode, let it store a field at a time
7662 since that should make a CONST_INT or CONST_DOUBLE when we
7663 fold. Likewise, if we have a target we can use, it is best to
7664 store directly into the target unless the type is large enough
7665 that memcpy will be used. If we are making an initializer and
7666 all operands are constant, put it in memory as well.
7668 FIXME: Avoid trying to fill vector constructors piece-meal.
7669 Output them with output_constant_def below unless we're sure
7670 they're zeros. This should go away when vector initializers
7671 are treated like VECTOR_CST instead of arrays. */
7672 if ((TREE_STATIC (exp
)
7673 && ((mode
== BLKmode
7674 && ! (target
!= 0 && safe_from_p (target
, exp
, 1)))
7675 || TREE_ADDRESSABLE (exp
)
7676 || (host_integerp (TYPE_SIZE_UNIT (type
), 1)
7677 && (! MOVE_BY_PIECES_P
7678 (tree_low_cst (TYPE_SIZE_UNIT (type
), 1),
7680 && ! mostly_zeros_p (exp
))))
7681 || ((modifier
== EXPAND_INITIALIZER
|| modifier
== EXPAND_CONST_ADDRESS
)
7682 && TREE_CONSTANT (exp
)))
7689 constructor
= expand_expr_constant (exp
, 1, modifier
);
7691 if (modifier
!= EXPAND_CONST_ADDRESS
7692 && modifier
!= EXPAND_INITIALIZER
7693 && modifier
!= EXPAND_SUM
)
7694 constructor
= validize_mem (constructor
);
7699 /* Handle calls that pass values in multiple non-contiguous
7700 locations. The Irix 6 ABI has examples of this. */
7701 if (target
== 0 || ! safe_from_p (target
, exp
, 1)
7702 || GET_CODE (target
) == PARALLEL
|| modifier
== EXPAND_STACK_PARM
)
7708 = assign_temp (build_qualified_type (type
, (TYPE_QUALS (type
)
7709 | (TREE_READONLY (exp
)
7710 * TYPE_QUAL_CONST
))),
7711 0, TREE_ADDRESSABLE (exp
), 1);
7714 store_constructor (exp
, target
, 0, int_expr_size (exp
));
7719 /* expand_expr: generate code for computing expression EXP.
7720 An rtx for the computed value is returned. The value is never null.
7721 In the case of a void EXP, const0_rtx is returned.
7723 The value may be stored in TARGET if TARGET is nonzero.
7724 TARGET is just a suggestion; callers must assume that
7725 the rtx returned may not be the same as TARGET.
7727 If TARGET is CONST0_RTX, it means that the value will be ignored.
7729 If TMODE is not VOIDmode, it suggests generating the
7730 result in mode TMODE. But this is done only when convenient.
7731 Otherwise, TMODE is ignored and the value generated in its natural mode.
7732 TMODE is just a suggestion; callers must assume that
7733 the rtx returned may not have mode TMODE.
7735 Note that TARGET may have neither TMODE nor MODE. In that case, it
7736 probably will not be used.
7738 If MODIFIER is EXPAND_SUM then when EXP is an addition
7739 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
7740 or a nest of (PLUS ...) and (MINUS ...) where the terms are
7741 products as above, or REG or MEM, or constant.
7742 Ordinarily in such cases we would output mul or add instructions
7743 and then return a pseudo reg containing the sum.
7745 EXPAND_INITIALIZER is much like EXPAND_SUM except that
7746 it also marks a label as absolutely required (it can't be dead).
7747 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
7748 This is used for outputting expressions used in initializers.
7750 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
7751 with a constant address even if that address is not normally legitimate.
7752 EXPAND_INITIALIZER and EXPAND_SUM also have this effect.
7754 EXPAND_STACK_PARM is used when expanding to a TARGET on the stack for
7755 a call parameter. Such targets require special care as we haven't yet
7756 marked TARGET so that it's safe from being trashed by libcalls. We
7757 don't want to use TARGET for anything but the final result;
7758 Intermediate values must go elsewhere. Additionally, calls to
7759 emit_block_move will be flagged with BLOCK_OP_CALL_PARM.
7761 If EXP is a VAR_DECL whose DECL_RTL was a MEM with an invalid
7762 address, and ALT_RTL is non-NULL, then *ALT_RTL is set to the
7763 DECL_RTL of the VAR_DECL. *ALT_RTL is also set if EXP is a
7764 COMPOUND_EXPR whose second argument is such a VAR_DECL, and so on
7768 expand_expr_real (tree exp
, rtx target
, enum machine_mode tmode
,
7769 enum expand_modifier modifier
, rtx
*alt_rtl
)
7773 /* Handle ERROR_MARK before anybody tries to access its type. */
7774 if (TREE_CODE (exp
) == ERROR_MARK
7775 || (TREE_CODE (TREE_TYPE (exp
)) == ERROR_MARK
))
7777 ret
= CONST0_RTX (tmode
);
7778 return ret
? ret
: const0_rtx
;
7781 /* If this is an expression of some kind and it has an associated line
7782 number, then emit the line number before expanding the expression.
7784 We need to save and restore the file and line information so that
7785 errors discovered during expansion are emitted with the right
7786 information. It would be better of the diagnostic routines
7787 used the file/line information embedded in the tree nodes rather
7789 if (cfun
&& EXPR_HAS_LOCATION (exp
))
7791 location_t saved_location
= input_location
;
7792 location_t saved_curr_loc
= get_curr_insn_source_location ();
7793 tree saved_block
= get_curr_insn_block ();
7794 input_location
= EXPR_LOCATION (exp
);
7795 set_curr_insn_source_location (input_location
);
7797 /* Record where the insns produced belong. */
7798 set_curr_insn_block (TREE_BLOCK (exp
));
7800 ret
= expand_expr_real_1 (exp
, target
, tmode
, modifier
, alt_rtl
);
7802 input_location
= saved_location
;
7803 set_curr_insn_block (saved_block
);
7804 set_curr_insn_source_location (saved_curr_loc
);
7808 ret
= expand_expr_real_1 (exp
, target
, tmode
, modifier
, alt_rtl
);
7815 expand_expr_real_2 (sepops ops
, rtx target
, enum machine_mode tmode
,
7816 enum expand_modifier modifier
)
7818 rtx op0
, op1
, op2
, temp
;
7821 enum machine_mode mode
;
7822 enum tree_code code
= ops
->code
;
7824 rtx subtarget
, original_target
;
7826 bool reduce_bit_field
;
7827 location_t loc
= ops
->location
;
7828 tree treeop0
, treeop1
, treeop2
;
7829 #define REDUCE_BIT_FIELD(expr) (reduce_bit_field \
7830 ? reduce_to_bit_field_precision ((expr), \
7836 mode
= TYPE_MODE (type
);
7837 unsignedp
= TYPE_UNSIGNED (type
);
7843 /* We should be called only on simple (binary or unary) expressions,
7844 exactly those that are valid in gimple expressions that aren't
7845 GIMPLE_SINGLE_RHS (or invalid). */
7846 gcc_assert (get_gimple_rhs_class (code
) == GIMPLE_UNARY_RHS
7847 || get_gimple_rhs_class (code
) == GIMPLE_BINARY_RHS
7848 || get_gimple_rhs_class (code
) == GIMPLE_TERNARY_RHS
);
7850 ignore
= (target
== const0_rtx
7851 || ((CONVERT_EXPR_CODE_P (code
)
7852 || code
== COND_EXPR
|| code
== VIEW_CONVERT_EXPR
)
7853 && TREE_CODE (type
) == VOID_TYPE
));
7855 /* We should be called only if we need the result. */
7856 gcc_assert (!ignore
);
7858 /* An operation in what may be a bit-field type needs the
7859 result to be reduced to the precision of the bit-field type,
7860 which is narrower than that of the type's mode. */
7861 reduce_bit_field
= (INTEGRAL_TYPE_P (type
)
7862 && GET_MODE_PRECISION (mode
) > TYPE_PRECISION (type
));
7864 if (reduce_bit_field
&& modifier
== EXPAND_STACK_PARM
)
7867 /* Use subtarget as the target for operand 0 of a binary operation. */
7868 subtarget
= get_subtarget (target
);
7869 original_target
= target
;
7873 case NON_LVALUE_EXPR
:
7876 if (treeop0
== error_mark_node
)
7879 if (TREE_CODE (type
) == UNION_TYPE
)
7881 tree valtype
= TREE_TYPE (treeop0
);
7883 /* If both input and output are BLKmode, this conversion isn't doing
7884 anything except possibly changing memory attribute. */
7885 if (mode
== BLKmode
&& TYPE_MODE (valtype
) == BLKmode
)
7887 rtx result
= expand_expr (treeop0
, target
, tmode
,
7890 result
= copy_rtx (result
);
7891 set_mem_attributes (result
, type
, 0);
7897 if (TYPE_MODE (type
) != BLKmode
)
7898 target
= gen_reg_rtx (TYPE_MODE (type
));
7900 target
= assign_temp (type
, 0, 1, 1);
7904 /* Store data into beginning of memory target. */
7905 store_expr (treeop0
,
7906 adjust_address (target
, TYPE_MODE (valtype
), 0),
7907 modifier
== EXPAND_STACK_PARM
,
7912 gcc_assert (REG_P (target
));
7914 /* Store this field into a union of the proper type. */
7915 store_field (target
,
7916 MIN ((int_size_in_bytes (TREE_TYPE
7919 (HOST_WIDE_INT
) GET_MODE_BITSIZE (mode
)),
7920 0, 0, 0, TYPE_MODE (valtype
), treeop0
,
7924 /* Return the entire union. */
7928 if (mode
== TYPE_MODE (TREE_TYPE (treeop0
)))
7930 op0
= expand_expr (treeop0
, target
, VOIDmode
,
7933 /* If the signedness of the conversion differs and OP0 is
7934 a promoted SUBREG, clear that indication since we now
7935 have to do the proper extension. */
7936 if (TYPE_UNSIGNED (TREE_TYPE (treeop0
)) != unsignedp
7937 && GET_CODE (op0
) == SUBREG
)
7938 SUBREG_PROMOTED_VAR_P (op0
) = 0;
7940 return REDUCE_BIT_FIELD (op0
);
7943 op0
= expand_expr (treeop0
, NULL_RTX
, mode
,
7944 modifier
== EXPAND_SUM
? EXPAND_NORMAL
: modifier
);
7945 if (GET_MODE (op0
) == mode
)
7948 /* If OP0 is a constant, just convert it into the proper mode. */
7949 else if (CONSTANT_P (op0
))
7951 tree inner_type
= TREE_TYPE (treeop0
);
7952 enum machine_mode inner_mode
= GET_MODE (op0
);
7954 if (inner_mode
== VOIDmode
)
7955 inner_mode
= TYPE_MODE (inner_type
);
7957 if (modifier
== EXPAND_INITIALIZER
)
7958 op0
= simplify_gen_subreg (mode
, op0
, inner_mode
,
7959 subreg_lowpart_offset (mode
,
7962 op0
= convert_modes (mode
, inner_mode
, op0
,
7963 TYPE_UNSIGNED (inner_type
));
7966 else if (modifier
== EXPAND_INITIALIZER
)
7967 op0
= gen_rtx_fmt_e (unsignedp
? ZERO_EXTEND
: SIGN_EXTEND
, mode
, op0
);
7969 else if (target
== 0)
7970 op0
= convert_to_mode (mode
, op0
,
7971 TYPE_UNSIGNED (TREE_TYPE
7975 convert_move (target
, op0
,
7976 TYPE_UNSIGNED (TREE_TYPE (treeop0
)));
7980 return REDUCE_BIT_FIELD (op0
);
7982 case ADDR_SPACE_CONVERT_EXPR
:
7984 tree treeop0_type
= TREE_TYPE (treeop0
);
7986 addr_space_t as_from
;
7988 gcc_assert (POINTER_TYPE_P (type
));
7989 gcc_assert (POINTER_TYPE_P (treeop0_type
));
7991 as_to
= TYPE_ADDR_SPACE (TREE_TYPE (type
));
7992 as_from
= TYPE_ADDR_SPACE (TREE_TYPE (treeop0_type
));
7994 /* Conversions between pointers to the same address space should
7995 have been implemented via CONVERT_EXPR / NOP_EXPR. */
7996 gcc_assert (as_to
!= as_from
);
7998 /* Ask target code to handle conversion between pointers
7999 to overlapping address spaces. */
8000 if (targetm
.addr_space
.subset_p (as_to
, as_from
)
8001 || targetm
.addr_space
.subset_p (as_from
, as_to
))
8003 op0
= expand_expr (treeop0
, NULL_RTX
, VOIDmode
, modifier
);
8004 op0
= targetm
.addr_space
.convert (op0
, treeop0_type
, type
);
8009 /* For disjoint address spaces, converting anything but
8010 a null pointer invokes undefined behaviour. We simply
8011 always return a null pointer here. */
8012 return CONST0_RTX (mode
);
8015 case POINTER_PLUS_EXPR
:
8016 /* Even though the sizetype mode and the pointer's mode can be different
8017 expand is able to handle this correctly and get the correct result out
8018 of the PLUS_EXPR code. */
8019 /* Make sure to sign-extend the sizetype offset in a POINTER_PLUS_EXPR
8020 if sizetype precision is smaller than pointer precision. */
8021 if (TYPE_PRECISION (sizetype
) < TYPE_PRECISION (type
))
8022 treeop1
= fold_convert_loc (loc
, type
,
8023 fold_convert_loc (loc
, ssizetype
,
8026 /* If we are adding a constant, a VAR_DECL that is sp, fp, or ap, and
8027 something else, make sure we add the register to the constant and
8028 then to the other thing. This case can occur during strength
8029 reduction and doing it this way will produce better code if the
8030 frame pointer or argument pointer is eliminated.
8032 fold-const.c will ensure that the constant is always in the inner
8033 PLUS_EXPR, so the only case we need to do anything about is if
8034 sp, ap, or fp is our second argument, in which case we must swap
8035 the innermost first argument and our second argument. */
8037 if (TREE_CODE (treeop0
) == PLUS_EXPR
8038 && TREE_CODE (TREE_OPERAND (treeop0
, 1)) == INTEGER_CST
8039 && TREE_CODE (treeop1
) == VAR_DECL
8040 && (DECL_RTL (treeop1
) == frame_pointer_rtx
8041 || DECL_RTL (treeop1
) == stack_pointer_rtx
8042 || DECL_RTL (treeop1
) == arg_pointer_rtx
))
8046 treeop1
= TREE_OPERAND (treeop0
, 0);
8047 TREE_OPERAND (treeop0
, 0) = t
;
8050 /* If the result is to be ptr_mode and we are adding an integer to
8051 something, we might be forming a constant. So try to use
8052 plus_constant. If it produces a sum and we can't accept it,
8053 use force_operand. This allows P = &ARR[const] to generate
8054 efficient code on machines where a SYMBOL_REF is not a valid
8057 If this is an EXPAND_SUM call, always return the sum. */
8058 if (modifier
== EXPAND_SUM
|| modifier
== EXPAND_INITIALIZER
8059 || (mode
== ptr_mode
&& (unsignedp
|| ! flag_trapv
)))
8061 if (modifier
== EXPAND_STACK_PARM
)
8063 if (TREE_CODE (treeop0
) == INTEGER_CST
8064 && GET_MODE_PRECISION (mode
) <= HOST_BITS_PER_WIDE_INT
8065 && TREE_CONSTANT (treeop1
))
8069 op1
= expand_expr (treeop1
, subtarget
, VOIDmode
,
8071 /* Use immed_double_const to ensure that the constant is
8072 truncated according to the mode of OP1, then sign extended
8073 to a HOST_WIDE_INT. Using the constant directly can result
8074 in non-canonical RTL in a 64x32 cross compile. */
8076 = immed_double_const (TREE_INT_CST_LOW (treeop0
),
8078 TYPE_MODE (TREE_TYPE (treeop1
)));
8079 op1
= plus_constant (op1
, INTVAL (constant_part
));
8080 if (modifier
!= EXPAND_SUM
&& modifier
!= EXPAND_INITIALIZER
)
8081 op1
= force_operand (op1
, target
);
8082 return REDUCE_BIT_FIELD (op1
);
8085 else if (TREE_CODE (treeop1
) == INTEGER_CST
8086 && GET_MODE_PRECISION (mode
) <= HOST_BITS_PER_WIDE_INT
8087 && TREE_CONSTANT (treeop0
))
8091 op0
= expand_expr (treeop0
, subtarget
, VOIDmode
,
8092 (modifier
== EXPAND_INITIALIZER
8093 ? EXPAND_INITIALIZER
: EXPAND_SUM
));
8094 if (! CONSTANT_P (op0
))
8096 op1
= expand_expr (treeop1
, NULL_RTX
,
8097 VOIDmode
, modifier
);
8098 /* Return a PLUS if modifier says it's OK. */
8099 if (modifier
== EXPAND_SUM
8100 || modifier
== EXPAND_INITIALIZER
)
8101 return simplify_gen_binary (PLUS
, mode
, op0
, op1
);
8104 /* Use immed_double_const to ensure that the constant is
8105 truncated according to the mode of OP1, then sign extended
8106 to a HOST_WIDE_INT. Using the constant directly can result
8107 in non-canonical RTL in a 64x32 cross compile. */
8109 = immed_double_const (TREE_INT_CST_LOW (treeop1
),
8111 TYPE_MODE (TREE_TYPE (treeop0
)));
8112 op0
= plus_constant (op0
, INTVAL (constant_part
));
8113 if (modifier
!= EXPAND_SUM
&& modifier
!= EXPAND_INITIALIZER
)
8114 op0
= force_operand (op0
, target
);
8115 return REDUCE_BIT_FIELD (op0
);
8119 /* Use TER to expand pointer addition of a negated value
8120 as pointer subtraction. */
8121 if ((POINTER_TYPE_P (TREE_TYPE (treeop0
))
8122 || (TREE_CODE (TREE_TYPE (treeop0
)) == VECTOR_TYPE
8123 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (treeop0
)))))
8124 && TREE_CODE (treeop1
) == SSA_NAME
8125 && TYPE_MODE (TREE_TYPE (treeop0
))
8126 == TYPE_MODE (TREE_TYPE (treeop1
)))
8128 gimple def
= get_def_for_expr (treeop1
, NEGATE_EXPR
);
8131 treeop1
= gimple_assign_rhs1 (def
);
8137 /* No sense saving up arithmetic to be done
8138 if it's all in the wrong mode to form part of an address.
8139 And force_operand won't know whether to sign-extend or
8141 if ((modifier
!= EXPAND_SUM
&& modifier
!= EXPAND_INITIALIZER
)
8142 || mode
!= ptr_mode
)
8144 expand_operands (treeop0
, treeop1
,
8145 subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8146 if (op0
== const0_rtx
)
8148 if (op1
== const0_rtx
)
8153 expand_operands (treeop0
, treeop1
,
8154 subtarget
, &op0
, &op1
, modifier
);
8155 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS
, mode
, op0
, op1
));
8159 /* For initializers, we are allowed to return a MINUS of two
8160 symbolic constants. Here we handle all cases when both operands
8162 /* Handle difference of two symbolic constants,
8163 for the sake of an initializer. */
8164 if ((modifier
== EXPAND_SUM
|| modifier
== EXPAND_INITIALIZER
)
8165 && really_constant_p (treeop0
)
8166 && really_constant_p (treeop1
))
8168 expand_operands (treeop0
, treeop1
,
8169 NULL_RTX
, &op0
, &op1
, modifier
);
8171 /* If the last operand is a CONST_INT, use plus_constant of
8172 the negated constant. Else make the MINUS. */
8173 if (CONST_INT_P (op1
))
8174 return REDUCE_BIT_FIELD (plus_constant (op0
, - INTVAL (op1
)));
8176 return REDUCE_BIT_FIELD (gen_rtx_MINUS (mode
, op0
, op1
));
8179 /* No sense saving up arithmetic to be done
8180 if it's all in the wrong mode to form part of an address.
8181 And force_operand won't know whether to sign-extend or
8183 if ((modifier
!= EXPAND_SUM
&& modifier
!= EXPAND_INITIALIZER
)
8184 || mode
!= ptr_mode
)
8187 expand_operands (treeop0
, treeop1
,
8188 subtarget
, &op0
, &op1
, modifier
);
8190 /* Convert A - const to A + (-const). */
8191 if (CONST_INT_P (op1
))
8193 op1
= negate_rtx (mode
, op1
);
8194 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS
, mode
, op0
, op1
));
8199 case WIDEN_MULT_PLUS_EXPR
:
8200 case WIDEN_MULT_MINUS_EXPR
:
8201 expand_operands (treeop0
, treeop1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8202 op2
= expand_normal (treeop2
);
8203 target
= expand_widen_pattern_expr (ops
, op0
, op1
, op2
,
8207 case WIDEN_MULT_EXPR
:
8208 /* If first operand is constant, swap them.
8209 Thus the following special case checks need only
8210 check the second operand. */
8211 if (TREE_CODE (treeop0
) == INTEGER_CST
)
8218 /* First, check if we have a multiplication of one signed and one
8219 unsigned operand. */
8220 if (TREE_CODE (treeop1
) != INTEGER_CST
8221 && (TYPE_UNSIGNED (TREE_TYPE (treeop0
))
8222 != TYPE_UNSIGNED (TREE_TYPE (treeop1
))))
8224 enum machine_mode innermode
= TYPE_MODE (TREE_TYPE (treeop0
));
8225 this_optab
= usmul_widen_optab
;
8226 if (find_widening_optab_handler (this_optab
, mode
, innermode
, 0)
8227 != CODE_FOR_nothing
)
8229 if (TYPE_UNSIGNED (TREE_TYPE (treeop0
)))
8230 expand_operands (treeop0
, treeop1
, NULL_RTX
, &op0
, &op1
,
8233 expand_operands (treeop0
, treeop1
, NULL_RTX
, &op1
, &op0
,
8238 /* Check for a multiplication with matching signedness. */
8239 else if ((TREE_CODE (treeop1
) == INTEGER_CST
8240 && int_fits_type_p (treeop1
, TREE_TYPE (treeop0
)))
8241 || (TYPE_UNSIGNED (TREE_TYPE (treeop1
))
8242 == TYPE_UNSIGNED (TREE_TYPE (treeop0
))))
8244 tree op0type
= TREE_TYPE (treeop0
);
8245 enum machine_mode innermode
= TYPE_MODE (op0type
);
8246 bool zextend_p
= TYPE_UNSIGNED (op0type
);
8247 optab other_optab
= zextend_p
? smul_widen_optab
: umul_widen_optab
;
8248 this_optab
= zextend_p
? umul_widen_optab
: smul_widen_optab
;
8250 if (TREE_CODE (treeop0
) != INTEGER_CST
)
8252 if (find_widening_optab_handler (this_optab
, mode
, innermode
, 0)
8253 != CODE_FOR_nothing
)
8255 expand_operands (treeop0
, treeop1
, NULL_RTX
, &op0
, &op1
,
8257 temp
= expand_widening_mult (mode
, op0
, op1
, target
,
8258 unsignedp
, this_optab
);
8259 return REDUCE_BIT_FIELD (temp
);
8261 if (find_widening_optab_handler (other_optab
, mode
, innermode
, 0)
8263 && innermode
== word_mode
)
8266 op0
= expand_normal (treeop0
);
8267 if (TREE_CODE (treeop1
) == INTEGER_CST
)
8268 op1
= convert_modes (innermode
, mode
,
8269 expand_normal (treeop1
), unsignedp
);
8271 op1
= expand_normal (treeop1
);
8272 temp
= expand_binop (mode
, other_optab
, op0
, op1
, target
,
8273 unsignedp
, OPTAB_LIB_WIDEN
);
8274 hipart
= gen_highpart (innermode
, temp
);
8275 htem
= expand_mult_highpart_adjust (innermode
, hipart
,
8279 emit_move_insn (hipart
, htem
);
8280 return REDUCE_BIT_FIELD (temp
);
8284 treeop0
= fold_build1 (CONVERT_EXPR
, type
, treeop0
);
8285 treeop1
= fold_build1 (CONVERT_EXPR
, type
, treeop1
);
8286 expand_operands (treeop0
, treeop1
, subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8287 return REDUCE_BIT_FIELD (expand_mult (mode
, op0
, op1
, target
, unsignedp
));
8291 optab opt
= fma_optab
;
8294 /* If there is no insn for FMA, emit it as __builtin_fma{,f,l}
8296 if (optab_handler (fma_optab
, mode
) == CODE_FOR_nothing
)
8298 tree fn
= mathfn_built_in (TREE_TYPE (treeop0
), BUILT_IN_FMA
);
8301 gcc_assert (fn
!= NULL_TREE
);
8302 call_expr
= build_call_expr (fn
, 3, treeop0
, treeop1
, treeop2
);
8303 return expand_builtin (call_expr
, target
, subtarget
, mode
, false);
8306 def0
= get_def_for_expr (treeop0
, NEGATE_EXPR
);
8307 def2
= get_def_for_expr (treeop2
, NEGATE_EXPR
);
8312 && optab_handler (fnms_optab
, mode
) != CODE_FOR_nothing
)
8315 op0
= expand_normal (gimple_assign_rhs1 (def0
));
8316 op2
= expand_normal (gimple_assign_rhs1 (def2
));
8319 && optab_handler (fnma_optab
, mode
) != CODE_FOR_nothing
)
8322 op0
= expand_normal (gimple_assign_rhs1 (def0
));
8325 && optab_handler (fms_optab
, mode
) != CODE_FOR_nothing
)
8328 op2
= expand_normal (gimple_assign_rhs1 (def2
));
8332 op0
= expand_expr (treeop0
, subtarget
, VOIDmode
, EXPAND_NORMAL
);
8334 op2
= expand_normal (treeop2
);
8335 op1
= expand_normal (treeop1
);
8337 return expand_ternary_op (TYPE_MODE (type
), opt
,
8338 op0
, op1
, op2
, target
, 0);
8342 /* If this is a fixed-point operation, then we cannot use the code
8343 below because "expand_mult" doesn't support sat/no-sat fixed-point
8345 if (ALL_FIXED_POINT_MODE_P (mode
))
8348 /* If first operand is constant, swap them.
8349 Thus the following special case checks need only
8350 check the second operand. */
8351 if (TREE_CODE (treeop0
) == INTEGER_CST
)
8358 /* Attempt to return something suitable for generating an
8359 indexed address, for machines that support that. */
8361 if (modifier
== EXPAND_SUM
&& mode
== ptr_mode
8362 && host_integerp (treeop1
, 0))
8364 tree exp1
= treeop1
;
8366 op0
= expand_expr (treeop0
, subtarget
, VOIDmode
,
8370 op0
= force_operand (op0
, NULL_RTX
);
8372 op0
= copy_to_mode_reg (mode
, op0
);
8374 return REDUCE_BIT_FIELD (gen_rtx_MULT (mode
, op0
,
8375 gen_int_mode (tree_low_cst (exp1
, 0),
8376 TYPE_MODE (TREE_TYPE (exp1
)))));
8379 if (modifier
== EXPAND_STACK_PARM
)
8382 expand_operands (treeop0
, treeop1
, subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8383 return REDUCE_BIT_FIELD (expand_mult (mode
, op0
, op1
, target
, unsignedp
));
8385 case TRUNC_DIV_EXPR
:
8386 case FLOOR_DIV_EXPR
:
8388 case ROUND_DIV_EXPR
:
8389 case EXACT_DIV_EXPR
:
8390 /* If this is a fixed-point operation, then we cannot use the code
8391 below because "expand_divmod" doesn't support sat/no-sat fixed-point
8393 if (ALL_FIXED_POINT_MODE_P (mode
))
8396 if (modifier
== EXPAND_STACK_PARM
)
8398 /* Possible optimization: compute the dividend with EXPAND_SUM
8399 then if the divisor is constant can optimize the case
8400 where some terms of the dividend have coeffs divisible by it. */
8401 expand_operands (treeop0
, treeop1
,
8402 subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8403 return expand_divmod (0, code
, mode
, op0
, op1
, target
, unsignedp
);
8408 case TRUNC_MOD_EXPR
:
8409 case FLOOR_MOD_EXPR
:
8411 case ROUND_MOD_EXPR
:
8412 if (modifier
== EXPAND_STACK_PARM
)
8414 expand_operands (treeop0
, treeop1
,
8415 subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8416 return expand_divmod (1, code
, mode
, op0
, op1
, target
, unsignedp
);
8418 case FIXED_CONVERT_EXPR
:
8419 op0
= expand_normal (treeop0
);
8420 if (target
== 0 || modifier
== EXPAND_STACK_PARM
)
8421 target
= gen_reg_rtx (mode
);
8423 if ((TREE_CODE (TREE_TYPE (treeop0
)) == INTEGER_TYPE
8424 && TYPE_UNSIGNED (TREE_TYPE (treeop0
)))
8425 || (TREE_CODE (type
) == INTEGER_TYPE
&& TYPE_UNSIGNED (type
)))
8426 expand_fixed_convert (target
, op0
, 1, TYPE_SATURATING (type
));
8428 expand_fixed_convert (target
, op0
, 0, TYPE_SATURATING (type
));
8431 case FIX_TRUNC_EXPR
:
8432 op0
= expand_normal (treeop0
);
8433 if (target
== 0 || modifier
== EXPAND_STACK_PARM
)
8434 target
= gen_reg_rtx (mode
);
8435 expand_fix (target
, op0
, unsignedp
);
8439 op0
= expand_normal (treeop0
);
8440 if (target
== 0 || modifier
== EXPAND_STACK_PARM
)
8441 target
= gen_reg_rtx (mode
);
8442 /* expand_float can't figure out what to do if FROM has VOIDmode.
8443 So give it the correct mode. With -O, cse will optimize this. */
8444 if (GET_MODE (op0
) == VOIDmode
)
8445 op0
= copy_to_mode_reg (TYPE_MODE (TREE_TYPE (treeop0
)),
8447 expand_float (target
, op0
,
8448 TYPE_UNSIGNED (TREE_TYPE (treeop0
)));
8452 op0
= expand_expr (treeop0
, subtarget
,
8453 VOIDmode
, EXPAND_NORMAL
);
8454 if (modifier
== EXPAND_STACK_PARM
)
8456 temp
= expand_unop (mode
,
8457 optab_for_tree_code (NEGATE_EXPR
, type
,
8461 return REDUCE_BIT_FIELD (temp
);
8464 op0
= expand_expr (treeop0
, subtarget
,
8465 VOIDmode
, EXPAND_NORMAL
);
8466 if (modifier
== EXPAND_STACK_PARM
)
8469 /* ABS_EXPR is not valid for complex arguments. */
8470 gcc_assert (GET_MODE_CLASS (mode
) != MODE_COMPLEX_INT
8471 && GET_MODE_CLASS (mode
) != MODE_COMPLEX_FLOAT
);
8473 /* Unsigned abs is simply the operand. Testing here means we don't
8474 risk generating incorrect code below. */
8475 if (TYPE_UNSIGNED (type
))
8478 return expand_abs (mode
, op0
, target
, unsignedp
,
8479 safe_from_p (target
, treeop0
, 1));
8483 target
= original_target
;
8485 || modifier
== EXPAND_STACK_PARM
8486 || (MEM_P (target
) && MEM_VOLATILE_P (target
))
8487 || GET_MODE (target
) != mode
8489 && REGNO (target
) < FIRST_PSEUDO_REGISTER
))
8490 target
= gen_reg_rtx (mode
);
8491 expand_operands (treeop0
, treeop1
,
8492 target
, &op0
, &op1
, EXPAND_NORMAL
);
8494 /* First try to do it with a special MIN or MAX instruction.
8495 If that does not win, use a conditional jump to select the proper
8497 this_optab
= optab_for_tree_code (code
, type
, optab_default
);
8498 temp
= expand_binop (mode
, this_optab
, op0
, op1
, target
, unsignedp
,
8503 /* At this point, a MEM target is no longer useful; we will get better
8506 if (! REG_P (target
))
8507 target
= gen_reg_rtx (mode
);
8509 /* If op1 was placed in target, swap op0 and op1. */
8510 if (target
!= op0
&& target
== op1
)
8517 /* We generate better code and avoid problems with op1 mentioning
8518 target by forcing op1 into a pseudo if it isn't a constant. */
8519 if (! CONSTANT_P (op1
))
8520 op1
= force_reg (mode
, op1
);
8523 enum rtx_code comparison_code
;
8526 if (code
== MAX_EXPR
)
8527 comparison_code
= unsignedp
? GEU
: GE
;
8529 comparison_code
= unsignedp
? LEU
: LE
;
8531 /* Canonicalize to comparisons against 0. */
8532 if (op1
== const1_rtx
)
8534 /* Converting (a >= 1 ? a : 1) into (a > 0 ? a : 1)
8535 or (a != 0 ? a : 1) for unsigned.
8536 For MIN we are safe converting (a <= 1 ? a : 1)
8537 into (a <= 0 ? a : 1) */
8538 cmpop1
= const0_rtx
;
8539 if (code
== MAX_EXPR
)
8540 comparison_code
= unsignedp
? NE
: GT
;
8542 if (op1
== constm1_rtx
&& !unsignedp
)
8544 /* Converting (a >= -1 ? a : -1) into (a >= 0 ? a : -1)
8545 and (a <= -1 ? a : -1) into (a < 0 ? a : -1) */
8546 cmpop1
= const0_rtx
;
8547 if (code
== MIN_EXPR
)
8548 comparison_code
= LT
;
8550 #ifdef HAVE_conditional_move
8551 /* Use a conditional move if possible. */
8552 if (can_conditionally_move_p (mode
))
8556 /* ??? Same problem as in expmed.c: emit_conditional_move
8557 forces a stack adjustment via compare_from_rtx, and we
8558 lose the stack adjustment if the sequence we are about
8559 to create is discarded. */
8560 do_pending_stack_adjust ();
8564 /* Try to emit the conditional move. */
8565 insn
= emit_conditional_move (target
, comparison_code
,
8570 /* If we could do the conditional move, emit the sequence,
8574 rtx seq
= get_insns ();
8580 /* Otherwise discard the sequence and fall back to code with
8586 emit_move_insn (target
, op0
);
8588 temp
= gen_label_rtx ();
8589 do_compare_rtx_and_jump (target
, cmpop1
, comparison_code
,
8590 unsignedp
, mode
, NULL_RTX
, NULL_RTX
, temp
,
8593 emit_move_insn (target
, op1
);
8598 op0
= expand_expr (treeop0
, subtarget
,
8599 VOIDmode
, EXPAND_NORMAL
);
8600 if (modifier
== EXPAND_STACK_PARM
)
8602 /* In case we have to reduce the result to bitfield precision
8603 for unsigned bitfield expand this as XOR with a proper constant
8605 if (reduce_bit_field
&& TYPE_UNSIGNED (type
))
8606 temp
= expand_binop (mode
, xor_optab
, op0
,
8607 immed_double_int_const
8608 (double_int_mask (TYPE_PRECISION (type
)), mode
),
8609 target
, 1, OPTAB_LIB_WIDEN
);
8611 temp
= expand_unop (mode
, one_cmpl_optab
, op0
, target
, 1);
8615 /* ??? Can optimize bitwise operations with one arg constant.
8616 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
8617 and (a bitwise1 b) bitwise2 b (etc)
8618 but that is probably not worth while. */
8627 gcc_assert (VECTOR_MODE_P (TYPE_MODE (type
))
8628 || (GET_MODE_PRECISION (TYPE_MODE (type
))
8629 == TYPE_PRECISION (type
)));
8634 /* If this is a fixed-point operation, then we cannot use the code
8635 below because "expand_shift" doesn't support sat/no-sat fixed-point
8637 if (ALL_FIXED_POINT_MODE_P (mode
))
8640 if (! safe_from_p (subtarget
, treeop1
, 1))
8642 if (modifier
== EXPAND_STACK_PARM
)
8644 op0
= expand_expr (treeop0
, subtarget
,
8645 VOIDmode
, EXPAND_NORMAL
);
8646 temp
= expand_variable_shift (code
, mode
, op0
, treeop1
, target
,
8648 if (code
== LSHIFT_EXPR
)
8649 temp
= REDUCE_BIT_FIELD (temp
);
8652 /* Could determine the answer when only additive constants differ. Also,
8653 the addition of one can be handled by changing the condition. */
8660 case UNORDERED_EXPR
:
8668 temp
= do_store_flag (ops
,
8669 modifier
!= EXPAND_STACK_PARM
? target
: NULL_RTX
,
8670 tmode
!= VOIDmode
? tmode
: mode
);
8674 /* Use a compare and a jump for BLKmode comparisons, or for function
8675 type comparisons is HAVE_canonicalize_funcptr_for_compare. */
8678 || modifier
== EXPAND_STACK_PARM
8679 || ! safe_from_p (target
, treeop0
, 1)
8680 || ! safe_from_p (target
, treeop1
, 1)
8681 /* Make sure we don't have a hard reg (such as function's return
8682 value) live across basic blocks, if not optimizing. */
8683 || (!optimize
&& REG_P (target
)
8684 && REGNO (target
) < FIRST_PSEUDO_REGISTER
)))
8685 target
= gen_reg_rtx (tmode
!= VOIDmode
? tmode
: mode
);
8687 emit_move_insn (target
, const0_rtx
);
8689 op1
= gen_label_rtx ();
8690 jumpifnot_1 (code
, treeop0
, treeop1
, op1
, -1);
8692 if (TYPE_PRECISION (type
) == 1 && !TYPE_UNSIGNED (type
))
8693 emit_move_insn (target
, constm1_rtx
);
8695 emit_move_insn (target
, const1_rtx
);
8701 /* Get the rtx code of the operands. */
8702 op0
= expand_normal (treeop0
);
8703 op1
= expand_normal (treeop1
);
8706 target
= gen_reg_rtx (TYPE_MODE (type
));
8708 /* Move the real (op0) and imaginary (op1) parts to their location. */
8709 write_complex_part (target
, op0
, false);
8710 write_complex_part (target
, op1
, true);
8714 case WIDEN_SUM_EXPR
:
8716 tree oprnd0
= treeop0
;
8717 tree oprnd1
= treeop1
;
8719 expand_operands (oprnd0
, oprnd1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8720 target
= expand_widen_pattern_expr (ops
, op0
, NULL_RTX
, op1
,
8725 case REDUC_MAX_EXPR
:
8726 case REDUC_MIN_EXPR
:
8727 case REDUC_PLUS_EXPR
:
8729 op0
= expand_normal (treeop0
);
8730 this_optab
= optab_for_tree_code (code
, type
, optab_default
);
8731 temp
= expand_unop (mode
, this_optab
, op0
, target
, unsignedp
);
8736 case VEC_LSHIFT_EXPR
:
8737 case VEC_RSHIFT_EXPR
:
8739 target
= expand_vec_shift_expr (ops
, target
);
8743 case VEC_UNPACK_HI_EXPR
:
8744 case VEC_UNPACK_LO_EXPR
:
8746 op0
= expand_normal (treeop0
);
8747 temp
= expand_widen_pattern_expr (ops
, op0
, NULL_RTX
, NULL_RTX
,
8753 case VEC_UNPACK_FLOAT_HI_EXPR
:
8754 case VEC_UNPACK_FLOAT_LO_EXPR
:
8756 op0
= expand_normal (treeop0
);
8757 /* The signedness is determined from input operand. */
8758 temp
= expand_widen_pattern_expr
8759 (ops
, op0
, NULL_RTX
, NULL_RTX
,
8760 target
, TYPE_UNSIGNED (TREE_TYPE (treeop0
)));
8766 case VEC_WIDEN_MULT_HI_EXPR
:
8767 case VEC_WIDEN_MULT_LO_EXPR
:
8769 tree oprnd0
= treeop0
;
8770 tree oprnd1
= treeop1
;
8772 expand_operands (oprnd0
, oprnd1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8773 target
= expand_widen_pattern_expr (ops
, op0
, op1
, NULL_RTX
,
8775 gcc_assert (target
);
8779 case VEC_WIDEN_LSHIFT_HI_EXPR
:
8780 case VEC_WIDEN_LSHIFT_LO_EXPR
:
8782 tree oprnd0
= treeop0
;
8783 tree oprnd1
= treeop1
;
8785 expand_operands (oprnd0
, oprnd1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8786 target
= expand_widen_pattern_expr (ops
, op0
, op1
, NULL_RTX
,
8788 gcc_assert (target
);
8792 case VEC_PACK_TRUNC_EXPR
:
8793 case VEC_PACK_SAT_EXPR
:
8794 case VEC_PACK_FIX_TRUNC_EXPR
:
8795 mode
= TYPE_MODE (TREE_TYPE (treeop0
));
8799 expand_operands (treeop0
, treeop1
, target
, &op0
, &op1
, EXPAND_NORMAL
);
8800 op2
= expand_normal (treeop2
);
8802 /* Careful here: if the target doesn't support integral vector modes,
8803 a constant selection vector could wind up smooshed into a normal
8804 integral constant. */
8805 if (CONSTANT_P (op2
) && GET_CODE (op2
) != CONST_VECTOR
)
8807 tree sel_type
= TREE_TYPE (treeop2
);
8808 enum machine_mode vmode
8809 = mode_for_vector (TYPE_MODE (TREE_TYPE (sel_type
)),
8810 TYPE_VECTOR_SUBPARTS (sel_type
));
8811 gcc_assert (GET_MODE_CLASS (vmode
) == MODE_VECTOR_INT
);
8812 op2
= simplify_subreg (vmode
, op2
, TYPE_MODE (sel_type
), 0);
8813 gcc_assert (op2
&& GET_CODE (op2
) == CONST_VECTOR
);
8816 gcc_assert (GET_MODE_CLASS (GET_MODE (op2
)) == MODE_VECTOR_INT
);
8818 temp
= expand_vec_perm (mode
, op0
, op1
, op2
, target
);
8824 tree oprnd0
= treeop0
;
8825 tree oprnd1
= treeop1
;
8826 tree oprnd2
= treeop2
;
8829 expand_operands (oprnd0
, oprnd1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8830 op2
= expand_normal (oprnd2
);
8831 target
= expand_widen_pattern_expr (ops
, op0
, op1
, op2
,
8836 case REALIGN_LOAD_EXPR
:
8838 tree oprnd0
= treeop0
;
8839 tree oprnd1
= treeop1
;
8840 tree oprnd2
= treeop2
;
8843 this_optab
= optab_for_tree_code (code
, type
, optab_default
);
8844 expand_operands (oprnd0
, oprnd1
, NULL_RTX
, &op0
, &op1
, EXPAND_NORMAL
);
8845 op2
= expand_normal (oprnd2
);
8846 temp
= expand_ternary_op (mode
, this_optab
, op0
, op1
, op2
,
8853 /* A COND_EXPR with its type being VOID_TYPE represents a
8854 conditional jump and is handled in
8855 expand_gimple_cond_expr. */
8856 gcc_assert (!VOID_TYPE_P (type
));
8858 /* Note that COND_EXPRs whose type is a structure or union
8859 are required to be constructed to contain assignments of
8860 a temporary variable, so that we can evaluate them here
8861 for side effect only. If type is void, we must do likewise. */
8863 gcc_assert (!TREE_ADDRESSABLE (type
)
8865 && TREE_TYPE (treeop1
) != void_type_node
8866 && TREE_TYPE (treeop2
) != void_type_node
);
8868 /* If we are not to produce a result, we have no target. Otherwise,
8869 if a target was specified use it; it will not be used as an
8870 intermediate target unless it is safe. If no target, use a
8873 if (modifier
!= EXPAND_STACK_PARM
8875 && safe_from_p (original_target
, treeop0
, 1)
8876 && GET_MODE (original_target
) == mode
8877 #ifdef HAVE_conditional_move
8878 && (! can_conditionally_move_p (mode
)
8879 || REG_P (original_target
))
8881 && !MEM_P (original_target
))
8882 temp
= original_target
;
8884 temp
= assign_temp (type
, 0, 0, 1);
8886 do_pending_stack_adjust ();
8888 op0
= gen_label_rtx ();
8889 op1
= gen_label_rtx ();
8890 jumpifnot (treeop0
, op0
, -1);
8891 store_expr (treeop1
, temp
,
8892 modifier
== EXPAND_STACK_PARM
,
8895 emit_jump_insn (gen_jump (op1
));
8898 store_expr (treeop2
, temp
,
8899 modifier
== EXPAND_STACK_PARM
,
8907 target
= expand_vec_cond_expr (type
, treeop0
, treeop1
, treeop2
, target
);
8914 /* Here to do an ordinary binary operator. */
8916 expand_operands (treeop0
, treeop1
,
8917 subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
8919 this_optab
= optab_for_tree_code (code
, type
, optab_default
);
8921 if (modifier
== EXPAND_STACK_PARM
)
8923 temp
= expand_binop (mode
, this_optab
, op0
, op1
, target
,
8924 unsignedp
, OPTAB_LIB_WIDEN
);
8926 /* Bitwise operations do not need bitfield reduction as we expect their
8927 operands being properly truncated. */
8928 if (code
== BIT_XOR_EXPR
8929 || code
== BIT_AND_EXPR
8930 || code
== BIT_IOR_EXPR
)
8932 return REDUCE_BIT_FIELD (temp
);
8934 #undef REDUCE_BIT_FIELD
8937 expand_expr_real_1 (tree exp
, rtx target
, enum machine_mode tmode
,
8938 enum expand_modifier modifier
, rtx
*alt_rtl
)
8940 rtx op0
, op1
, temp
, decl_rtl
;
8943 enum machine_mode mode
;
8944 enum tree_code code
= TREE_CODE (exp
);
8945 rtx subtarget
, original_target
;
8948 bool reduce_bit_field
;
8949 location_t loc
= EXPR_LOCATION (exp
);
8950 struct separate_ops ops
;
8951 tree treeop0
, treeop1
, treeop2
;
8952 tree ssa_name
= NULL_TREE
;
8955 type
= TREE_TYPE (exp
);
8956 mode
= TYPE_MODE (type
);
8957 unsignedp
= TYPE_UNSIGNED (type
);
8959 treeop0
= treeop1
= treeop2
= NULL_TREE
;
8960 if (!VL_EXP_CLASS_P (exp
))
8961 switch (TREE_CODE_LENGTH (code
))
8964 case 3: treeop2
= TREE_OPERAND (exp
, 2);
8965 case 2: treeop1
= TREE_OPERAND (exp
, 1);
8966 case 1: treeop0
= TREE_OPERAND (exp
, 0);
8976 ignore
= (target
== const0_rtx
8977 || ((CONVERT_EXPR_CODE_P (code
)
8978 || code
== COND_EXPR
|| code
== VIEW_CONVERT_EXPR
)
8979 && TREE_CODE (type
) == VOID_TYPE
));
8981 /* An operation in what may be a bit-field type needs the
8982 result to be reduced to the precision of the bit-field type,
8983 which is narrower than that of the type's mode. */
8984 reduce_bit_field
= (!ignore
8985 && INTEGRAL_TYPE_P (type
)
8986 && GET_MODE_PRECISION (mode
) > TYPE_PRECISION (type
));
8988 /* If we are going to ignore this result, we need only do something
8989 if there is a side-effect somewhere in the expression. If there
8990 is, short-circuit the most common cases here. Note that we must
8991 not call expand_expr with anything but const0_rtx in case this
8992 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
8996 if (! TREE_SIDE_EFFECTS (exp
))
8999 /* Ensure we reference a volatile object even if value is ignored, but
9000 don't do this if all we are doing is taking its address. */
9001 if (TREE_THIS_VOLATILE (exp
)
9002 && TREE_CODE (exp
) != FUNCTION_DECL
9003 && mode
!= VOIDmode
&& mode
!= BLKmode
9004 && modifier
!= EXPAND_CONST_ADDRESS
)
9006 temp
= expand_expr (exp
, NULL_RTX
, VOIDmode
, modifier
);
9012 if (TREE_CODE_CLASS (code
) == tcc_unary
9013 || code
== COMPONENT_REF
|| code
== INDIRECT_REF
)
9014 return expand_expr (treeop0
, const0_rtx
, VOIDmode
,
9017 else if (TREE_CODE_CLASS (code
) == tcc_binary
9018 || TREE_CODE_CLASS (code
) == tcc_comparison
9019 || code
== ARRAY_REF
|| code
== ARRAY_RANGE_REF
)
9021 expand_expr (treeop0
, const0_rtx
, VOIDmode
, modifier
);
9022 expand_expr (treeop1
, const0_rtx
, VOIDmode
, modifier
);
9025 else if (code
== BIT_FIELD_REF
)
9027 expand_expr (treeop0
, const0_rtx
, VOIDmode
, modifier
);
9028 expand_expr (treeop1
, const0_rtx
, VOIDmode
, modifier
);
9029 expand_expr (treeop2
, const0_rtx
, VOIDmode
, modifier
);
9036 if (reduce_bit_field
&& modifier
== EXPAND_STACK_PARM
)
9039 /* Use subtarget as the target for operand 0 of a binary operation. */
9040 subtarget
= get_subtarget (target
);
9041 original_target
= target
;
9047 tree function
= decl_function_context (exp
);
9049 temp
= label_rtx (exp
);
9050 temp
= gen_rtx_LABEL_REF (Pmode
, temp
);
9052 if (function
!= current_function_decl
9054 LABEL_REF_NONLOCAL_P (temp
) = 1;
9056 temp
= gen_rtx_MEM (FUNCTION_MODE
, temp
);
9061 /* ??? ivopts calls expander, without any preparation from
9062 out-of-ssa. So fake instructions as if this was an access to the
9063 base variable. This unnecessarily allocates a pseudo, see how we can
9064 reuse it, if partition base vars have it set already. */
9065 if (!currently_expanding_to_rtl
)
9066 return expand_expr_real_1 (SSA_NAME_VAR (exp
), target
, tmode
, modifier
,
9069 g
= get_gimple_for_ssa_name (exp
);
9070 /* For EXPAND_INITIALIZER try harder to get something simpler. */
9072 && modifier
== EXPAND_INITIALIZER
9073 && !SSA_NAME_IS_DEFAULT_DEF (exp
)
9074 && (optimize
|| DECL_IGNORED_P (SSA_NAME_VAR (exp
)))
9075 && stmt_is_replaceable_p (SSA_NAME_DEF_STMT (exp
)))
9076 g
= SSA_NAME_DEF_STMT (exp
);
9078 return expand_expr_real (gimple_assign_rhs_to_tree (g
), target
, tmode
,
9082 decl_rtl
= get_rtx_for_ssa_name (ssa_name
);
9083 exp
= SSA_NAME_VAR (ssa_name
);
9084 goto expand_decl_rtl
;
9088 /* If a static var's type was incomplete when the decl was written,
9089 but the type is complete now, lay out the decl now. */
9090 if (DECL_SIZE (exp
) == 0
9091 && COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (TREE_TYPE (exp
))
9092 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
9093 layout_decl (exp
, 0);
9095 /* ... fall through ... */
9099 decl_rtl
= DECL_RTL (exp
);
9101 gcc_assert (decl_rtl
);
9102 decl_rtl
= copy_rtx (decl_rtl
);
9103 /* Record writes to register variables. */
9104 if (modifier
== EXPAND_WRITE
9106 && HARD_REGISTER_P (decl_rtl
))
9107 add_to_hard_reg_set (&crtl
->asm_clobbers
,
9108 GET_MODE (decl_rtl
), REGNO (decl_rtl
));
9110 /* Ensure variable marked as used even if it doesn't go through
9111 a parser. If it hasn't be used yet, write out an external
9113 if (! TREE_USED (exp
))
9115 assemble_external (exp
);
9116 TREE_USED (exp
) = 1;
9119 /* Show we haven't gotten RTL for this yet. */
9122 /* Variables inherited from containing functions should have
9123 been lowered by this point. */
9124 context
= decl_function_context (exp
);
9125 gcc_assert (!context
9126 || context
== current_function_decl
9127 || TREE_STATIC (exp
)
9128 || DECL_EXTERNAL (exp
)
9129 /* ??? C++ creates functions that are not TREE_STATIC. */
9130 || TREE_CODE (exp
) == FUNCTION_DECL
);
9132 /* This is the case of an array whose size is to be determined
9133 from its initializer, while the initializer is still being parsed.
9136 if (MEM_P (decl_rtl
) && REG_P (XEXP (decl_rtl
, 0)))
9137 temp
= validize_mem (decl_rtl
);
9139 /* If DECL_RTL is memory, we are in the normal case and the
9140 address is not valid, get the address into a register. */
9142 else if (MEM_P (decl_rtl
) && modifier
!= EXPAND_INITIALIZER
)
9145 *alt_rtl
= decl_rtl
;
9146 decl_rtl
= use_anchored_address (decl_rtl
);
9147 if (modifier
!= EXPAND_CONST_ADDRESS
9148 && modifier
!= EXPAND_SUM
9149 && !memory_address_addr_space_p (DECL_MODE (exp
),
9151 MEM_ADDR_SPACE (decl_rtl
)))
9152 temp
= replace_equiv_address (decl_rtl
,
9153 copy_rtx (XEXP (decl_rtl
, 0)));
9156 /* If we got something, return it. But first, set the alignment
9157 if the address is a register. */
9160 if (MEM_P (temp
) && REG_P (XEXP (temp
, 0)))
9161 mark_reg_pointer (XEXP (temp
, 0), DECL_ALIGN (exp
));
9166 /* If the mode of DECL_RTL does not match that of the decl,
9167 there are two cases: we are dealing with a BLKmode value
9168 that is returned in a register, or we are dealing with
9169 a promoted value. In the latter case, return a SUBREG
9170 of the wanted mode, but mark it so that we know that it
9171 was already extended. */
9172 if (REG_P (decl_rtl
)
9173 && DECL_MODE (exp
) != BLKmode
9174 && GET_MODE (decl_rtl
) != DECL_MODE (exp
))
9176 enum machine_mode pmode
;
9178 /* Get the signedness to be used for this variable. Ensure we get
9179 the same mode we got when the variable was declared. */
9180 if (code
== SSA_NAME
9181 && (g
= SSA_NAME_DEF_STMT (ssa_name
))
9182 && gimple_code (g
) == GIMPLE_CALL
)
9184 gcc_assert (!gimple_call_internal_p (g
));
9185 pmode
= promote_function_mode (type
, mode
, &unsignedp
,
9186 gimple_call_fntype (g
),
9190 pmode
= promote_decl_mode (exp
, &unsignedp
);
9191 gcc_assert (GET_MODE (decl_rtl
) == pmode
);
9193 temp
= gen_lowpart_SUBREG (mode
, decl_rtl
);
9194 SUBREG_PROMOTED_VAR_P (temp
) = 1;
9195 SUBREG_PROMOTED_UNSIGNED_SET (temp
, unsignedp
);
9202 temp
= immed_double_const (TREE_INT_CST_LOW (exp
),
9203 TREE_INT_CST_HIGH (exp
), mode
);
9209 tree tmp
= NULL_TREE
;
9210 if (GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
9211 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
9212 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FRACT
9213 || GET_MODE_CLASS (mode
) == MODE_VECTOR_UFRACT
9214 || GET_MODE_CLASS (mode
) == MODE_VECTOR_ACCUM
9215 || GET_MODE_CLASS (mode
) == MODE_VECTOR_UACCUM
)
9216 return const_vector_from_tree (exp
);
9217 if (GET_MODE_CLASS (mode
) == MODE_INT
)
9219 tree type_for_mode
= lang_hooks
.types
.type_for_mode (mode
, 1);
9221 tmp
= fold_unary_loc (loc
, VIEW_CONVERT_EXPR
, type_for_mode
, exp
);
9224 tmp
= build_constructor_from_list (type
,
9225 TREE_VECTOR_CST_ELTS (exp
));
9226 return expand_expr (tmp
, ignore
? const0_rtx
: target
,
9231 return expand_expr (DECL_INITIAL (exp
), target
, VOIDmode
, modifier
);
9234 /* If optimized, generate immediate CONST_DOUBLE
9235 which will be turned into memory by reload if necessary.
9237 We used to force a register so that loop.c could see it. But
9238 this does not allow gen_* patterns to perform optimizations with
9239 the constants. It also produces two insns in cases like "x = 1.0;".
9240 On most machines, floating-point constants are not permitted in
9241 many insns, so we'd end up copying it to a register in any case.
9243 Now, we do the copying in expand_binop, if appropriate. */
9244 return CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (exp
),
9245 TYPE_MODE (TREE_TYPE (exp
)));
9248 return CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (exp
),
9249 TYPE_MODE (TREE_TYPE (exp
)));
9252 /* Handle evaluating a complex constant in a CONCAT target. */
9253 if (original_target
&& GET_CODE (original_target
) == CONCAT
)
9255 enum machine_mode mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
9258 rtarg
= XEXP (original_target
, 0);
9259 itarg
= XEXP (original_target
, 1);
9261 /* Move the real and imaginary parts separately. */
9262 op0
= expand_expr (TREE_REALPART (exp
), rtarg
, mode
, EXPAND_NORMAL
);
9263 op1
= expand_expr (TREE_IMAGPART (exp
), itarg
, mode
, EXPAND_NORMAL
);
9266 emit_move_insn (rtarg
, op0
);
9268 emit_move_insn (itarg
, op1
);
9270 return original_target
;
9273 /* ... fall through ... */
9276 temp
= expand_expr_constant (exp
, 1, modifier
);
9278 /* temp contains a constant address.
9279 On RISC machines where a constant address isn't valid,
9280 make some insns to get that address into a register. */
9281 if (modifier
!= EXPAND_CONST_ADDRESS
9282 && modifier
!= EXPAND_INITIALIZER
9283 && modifier
!= EXPAND_SUM
9284 && ! memory_address_addr_space_p (mode
, XEXP (temp
, 0),
9285 MEM_ADDR_SPACE (temp
)))
9286 return replace_equiv_address (temp
,
9287 copy_rtx (XEXP (temp
, 0)));
9293 rtx ret
= expand_expr_real_1 (val
, target
, tmode
, modifier
, alt_rtl
);
9295 if (!SAVE_EXPR_RESOLVED_P (exp
))
9297 /* We can indeed still hit this case, typically via builtin
9298 expanders calling save_expr immediately before expanding
9299 something. Assume this means that we only have to deal
9300 with non-BLKmode values. */
9301 gcc_assert (GET_MODE (ret
) != BLKmode
);
9303 val
= build_decl (EXPR_LOCATION (exp
),
9304 VAR_DECL
, NULL
, TREE_TYPE (exp
));
9305 DECL_ARTIFICIAL (val
) = 1;
9306 DECL_IGNORED_P (val
) = 1;
9308 TREE_OPERAND (exp
, 0) = treeop0
;
9309 SAVE_EXPR_RESOLVED_P (exp
) = 1;
9311 if (!CONSTANT_P (ret
))
9312 ret
= copy_to_reg (ret
);
9313 SET_DECL_RTL (val
, ret
);
9321 /* If we don't need the result, just ensure we evaluate any
9325 unsigned HOST_WIDE_INT idx
;
9328 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
9329 expand_expr (value
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
9334 return expand_constructor (exp
, target
, modifier
, false);
9336 case TARGET_MEM_REF
:
9339 = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp
, 0))));
9340 struct mem_address addr
;
9341 enum insn_code icode
;
9344 get_address_description (exp
, &addr
);
9345 op0
= addr_for_mem_ref (&addr
, as
, true);
9346 op0
= memory_address_addr_space (mode
, op0
, as
);
9347 temp
= gen_rtx_MEM (mode
, op0
);
9348 set_mem_attributes (temp
, exp
, 0);
9349 set_mem_addr_space (temp
, as
);
9350 align
= get_object_or_type_alignment (exp
);
9352 && align
< GET_MODE_ALIGNMENT (mode
)
9353 /* If the target does not have special handling for unaligned
9354 loads of mode then it can use regular moves for them. */
9355 && ((icode
= optab_handler (movmisalign_optab
, mode
))
9356 != CODE_FOR_nothing
))
9358 struct expand_operand ops
[2];
9360 /* We've already validated the memory, and we're creating a
9361 new pseudo destination. The predicates really can't fail,
9362 nor can the generator. */
9363 create_output_operand (&ops
[0], NULL_RTX
, mode
);
9364 create_fixed_operand (&ops
[1], temp
);
9365 expand_insn (icode
, 2, ops
);
9366 return ops
[0].value
;
9374 = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp
, 0))));
9375 enum machine_mode address_mode
;
9376 tree base
= TREE_OPERAND (exp
, 0);
9378 enum insn_code icode
;
9380 /* Handle expansion of non-aliased memory with non-BLKmode. That
9381 might end up in a register. */
9382 if (mem_ref_refers_to_non_mem_p (exp
))
9384 HOST_WIDE_INT offset
= mem_ref_offset (exp
).low
;
9387 base
= TREE_OPERAND (base
, 0);
9389 && host_integerp (TYPE_SIZE (TREE_TYPE (exp
)), 1)
9390 && (GET_MODE_BITSIZE (DECL_MODE (base
))
9391 == TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp
)))))
9392 return expand_expr (build1 (VIEW_CONVERT_EXPR
,
9393 TREE_TYPE (exp
), base
),
9394 target
, tmode
, modifier
);
9395 bit_offset
= bitsize_int (offset
* BITS_PER_UNIT
);
9396 bftype
= TREE_TYPE (base
);
9397 if (TYPE_MODE (TREE_TYPE (exp
)) != BLKmode
)
9398 bftype
= TREE_TYPE (exp
);
9401 temp
= assign_stack_temp (DECL_MODE (base
),
9402 GET_MODE_SIZE (DECL_MODE (base
)),
9404 store_expr (base
, temp
, 0, false);
9405 temp
= adjust_address (temp
, BLKmode
, offset
);
9406 set_mem_size (temp
, int_size_in_bytes (TREE_TYPE (exp
)));
9409 return expand_expr (build3 (BIT_FIELD_REF
, bftype
,
9411 TYPE_SIZE (TREE_TYPE (exp
)),
9413 target
, tmode
, modifier
);
9415 address_mode
= targetm
.addr_space
.address_mode (as
);
9416 base
= TREE_OPERAND (exp
, 0);
9417 if ((def_stmt
= get_def_for_expr (base
, BIT_AND_EXPR
)))
9419 tree mask
= gimple_assign_rhs2 (def_stmt
);
9420 base
= build2 (BIT_AND_EXPR
, TREE_TYPE (base
),
9421 gimple_assign_rhs1 (def_stmt
), mask
);
9422 TREE_OPERAND (exp
, 0) = base
;
9424 align
= get_object_or_type_alignment (exp
);
9425 op0
= expand_expr (base
, NULL_RTX
, VOIDmode
, EXPAND_SUM
);
9426 op0
= memory_address_addr_space (address_mode
, op0
, as
);
9427 if (!integer_zerop (TREE_OPERAND (exp
, 1)))
9430 = immed_double_int_const (mem_ref_offset (exp
), address_mode
);
9431 op0
= simplify_gen_binary (PLUS
, address_mode
, op0
, off
);
9433 op0
= memory_address_addr_space (mode
, op0
, as
);
9434 temp
= gen_rtx_MEM (mode
, op0
);
9435 set_mem_attributes (temp
, exp
, 0);
9436 set_mem_addr_space (temp
, as
);
9437 if (TREE_THIS_VOLATILE (exp
))
9438 MEM_VOLATILE_P (temp
) = 1;
9440 && align
< GET_MODE_ALIGNMENT (mode
)
9441 /* If the target does not have special handling for unaligned
9442 loads of mode then it can use regular moves for them. */
9443 && ((icode
= optab_handler (movmisalign_optab
, mode
))
9444 != CODE_FOR_nothing
))
9446 struct expand_operand ops
[2];
9448 /* We've already validated the memory, and we're creating a
9449 new pseudo destination. The predicates really can't fail,
9450 nor can the generator. */
9451 create_output_operand (&ops
[0], NULL_RTX
, mode
);
9452 create_fixed_operand (&ops
[1], temp
);
9453 expand_insn (icode
, 2, ops
);
9454 return ops
[0].value
;
9462 tree array
= treeop0
;
9463 tree index
= treeop1
;
9465 /* Fold an expression like: "foo"[2].
9466 This is not done in fold so it won't happen inside &.
9467 Don't fold if this is for wide characters since it's too
9468 difficult to do correctly and this is a very rare case. */
9470 if (modifier
!= EXPAND_CONST_ADDRESS
9471 && modifier
!= EXPAND_INITIALIZER
9472 && modifier
!= EXPAND_MEMORY
)
9474 tree t
= fold_read_from_constant_string (exp
);
9477 return expand_expr (t
, target
, tmode
, modifier
);
9480 /* If this is a constant index into a constant array,
9481 just get the value from the array. Handle both the cases when
9482 we have an explicit constructor and when our operand is a variable
9483 that was declared const. */
9485 if (modifier
!= EXPAND_CONST_ADDRESS
9486 && modifier
!= EXPAND_INITIALIZER
9487 && modifier
!= EXPAND_MEMORY
9488 && TREE_CODE (array
) == CONSTRUCTOR
9489 && ! TREE_SIDE_EFFECTS (array
)
9490 && TREE_CODE (index
) == INTEGER_CST
)
9492 unsigned HOST_WIDE_INT ix
;
9495 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (array
), ix
,
9497 if (tree_int_cst_equal (field
, index
))
9499 if (!TREE_SIDE_EFFECTS (value
))
9500 return expand_expr (fold (value
), target
, tmode
, modifier
);
9505 else if (optimize
>= 1
9506 && modifier
!= EXPAND_CONST_ADDRESS
9507 && modifier
!= EXPAND_INITIALIZER
9508 && modifier
!= EXPAND_MEMORY
9509 && TREE_READONLY (array
) && ! TREE_SIDE_EFFECTS (array
)
9510 && TREE_CODE (array
) == VAR_DECL
&& DECL_INITIAL (array
)
9511 && TREE_CODE (DECL_INITIAL (array
)) != ERROR_MARK
9512 && const_value_known_p (array
))
9514 if (TREE_CODE (index
) == INTEGER_CST
)
9516 tree init
= DECL_INITIAL (array
);
9518 if (TREE_CODE (init
) == CONSTRUCTOR
)
9520 unsigned HOST_WIDE_INT ix
;
9523 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (init
), ix
,
9525 if (tree_int_cst_equal (field
, index
))
9527 if (TREE_SIDE_EFFECTS (value
))
9530 if (TREE_CODE (value
) == CONSTRUCTOR
)
9532 /* If VALUE is a CONSTRUCTOR, this
9533 optimization is only useful if
9534 this doesn't store the CONSTRUCTOR
9535 into memory. If it does, it is more
9536 efficient to just load the data from
9537 the array directly. */
9538 rtx ret
= expand_constructor (value
, target
,
9540 if (ret
== NULL_RTX
)
9544 return expand_expr (fold (value
), target
, tmode
,
9548 else if(TREE_CODE (init
) == STRING_CST
)
9550 tree index1
= index
;
9551 tree low_bound
= array_ref_low_bound (exp
);
9552 index1
= fold_convert_loc (loc
, sizetype
,
9555 /* Optimize the special-case of a zero lower bound.
9557 We convert the low_bound to sizetype to avoid some problems
9558 with constant folding. (E.g. suppose the lower bound is 1,
9559 and its mode is QI. Without the conversion,l (ARRAY
9560 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
9561 +INDEX), which becomes (ARRAY+255+INDEX). Opps!) */
9563 if (! integer_zerop (low_bound
))
9564 index1
= size_diffop_loc (loc
, index1
,
9565 fold_convert_loc (loc
, sizetype
,
9568 if (0 > compare_tree_int (index1
,
9569 TREE_STRING_LENGTH (init
)))
9571 tree type
= TREE_TYPE (TREE_TYPE (init
));
9572 enum machine_mode mode
= TYPE_MODE (type
);
9574 if (GET_MODE_CLASS (mode
) == MODE_INT
9575 && GET_MODE_SIZE (mode
) == 1)
9576 return gen_int_mode (TREE_STRING_POINTER (init
)
9577 [TREE_INT_CST_LOW (index1
)],
9584 goto normal_inner_ref
;
9587 /* If the operand is a CONSTRUCTOR, we can just extract the
9588 appropriate field if it is present. */
9589 if (TREE_CODE (treeop0
) == CONSTRUCTOR
)
9591 unsigned HOST_WIDE_INT idx
;
9594 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (treeop0
),
9596 if (field
== treeop1
9597 /* We can normally use the value of the field in the
9598 CONSTRUCTOR. However, if this is a bitfield in
9599 an integral mode that we can fit in a HOST_WIDE_INT,
9600 we must mask only the number of bits in the bitfield,
9601 since this is done implicitly by the constructor. If
9602 the bitfield does not meet either of those conditions,
9603 we can't do this optimization. */
9604 && (! DECL_BIT_FIELD (field
)
9605 || ((GET_MODE_CLASS (DECL_MODE (field
)) == MODE_INT
)
9606 && (GET_MODE_PRECISION (DECL_MODE (field
))
9607 <= HOST_BITS_PER_WIDE_INT
))))
9609 if (DECL_BIT_FIELD (field
)
9610 && modifier
== EXPAND_STACK_PARM
)
9612 op0
= expand_expr (value
, target
, tmode
, modifier
);
9613 if (DECL_BIT_FIELD (field
))
9615 HOST_WIDE_INT bitsize
= TREE_INT_CST_LOW (DECL_SIZE (field
));
9616 enum machine_mode imode
= TYPE_MODE (TREE_TYPE (field
));
9618 if (TYPE_UNSIGNED (TREE_TYPE (field
)))
9620 op1
= GEN_INT (((HOST_WIDE_INT
) 1 << bitsize
) - 1);
9621 op0
= expand_and (imode
, op0
, op1
, target
);
9625 int count
= GET_MODE_PRECISION (imode
) - bitsize
;
9627 op0
= expand_shift (LSHIFT_EXPR
, imode
, op0
, count
,
9629 op0
= expand_shift (RSHIFT_EXPR
, imode
, op0
, count
,
9637 goto normal_inner_ref
;
9640 case ARRAY_RANGE_REF
:
9643 enum machine_mode mode1
, mode2
;
9644 HOST_WIDE_INT bitsize
, bitpos
;
9646 int volatilep
= 0, must_force_mem
;
9647 bool packedp
= false;
9648 tree tem
= get_inner_reference (exp
, &bitsize
, &bitpos
, &offset
,
9649 &mode1
, &unsignedp
, &volatilep
, true);
9650 rtx orig_op0
, memloc
;
9652 /* If we got back the original object, something is wrong. Perhaps
9653 we are evaluating an expression too early. In any event, don't
9654 infinitely recurse. */
9655 gcc_assert (tem
!= exp
);
9657 if (TYPE_PACKED (TREE_TYPE (TREE_OPERAND (exp
, 0)))
9658 || (TREE_CODE (TREE_OPERAND (exp
, 1)) == FIELD_DECL
9659 && DECL_PACKED (TREE_OPERAND (exp
, 1))))
9662 /* If TEM's type is a union of variable size, pass TARGET to the inner
9663 computation, since it will need a temporary and TARGET is known
9664 to have to do. This occurs in unchecked conversion in Ada. */
9667 (TREE_CODE (TREE_TYPE (tem
)) == UNION_TYPE
9668 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem
)))
9670 && modifier
!= EXPAND_STACK_PARM
9671 ? target
: NULL_RTX
),
9673 (modifier
== EXPAND_INITIALIZER
9674 || modifier
== EXPAND_CONST_ADDRESS
9675 || modifier
== EXPAND_STACK_PARM
)
9676 ? modifier
: EXPAND_NORMAL
);
9679 /* If the bitfield is volatile, we want to access it in the
9680 field's mode, not the computed mode.
9681 If a MEM has VOIDmode (external with incomplete type),
9682 use BLKmode for it instead. */
9685 if (volatilep
&& flag_strict_volatile_bitfields
> 0)
9686 op0
= adjust_address (op0
, mode1
, 0);
9687 else if (GET_MODE (op0
) == VOIDmode
)
9688 op0
= adjust_address (op0
, BLKmode
, 0);
9692 = CONSTANT_P (op0
) ? TYPE_MODE (TREE_TYPE (tem
)) : GET_MODE (op0
);
9694 /* If we have either an offset, a BLKmode result, or a reference
9695 outside the underlying object, we must force it to memory.
9696 Such a case can occur in Ada if we have unchecked conversion
9697 of an expression from a scalar type to an aggregate type or
9698 for an ARRAY_RANGE_REF whose type is BLKmode, or if we were
9699 passed a partially uninitialized object or a view-conversion
9700 to a larger size. */
9701 must_force_mem
= (offset
9703 || bitpos
+ bitsize
> GET_MODE_BITSIZE (mode2
));
9705 /* Handle CONCAT first. */
9706 if (GET_CODE (op0
) == CONCAT
&& !must_force_mem
)
9709 && bitsize
== GET_MODE_BITSIZE (GET_MODE (op0
)))
9712 && bitsize
== GET_MODE_BITSIZE (GET_MODE (XEXP (op0
, 0)))
9715 op0
= XEXP (op0
, 0);
9716 mode2
= GET_MODE (op0
);
9718 else if (bitpos
== GET_MODE_BITSIZE (GET_MODE (XEXP (op0
, 0)))
9719 && bitsize
== GET_MODE_BITSIZE (GET_MODE (XEXP (op0
, 1)))
9723 op0
= XEXP (op0
, 1);
9725 mode2
= GET_MODE (op0
);
9728 /* Otherwise force into memory. */
9732 /* If this is a constant, put it in a register if it is a legitimate
9733 constant and we don't need a memory reference. */
9734 if (CONSTANT_P (op0
)
9736 && targetm
.legitimate_constant_p (mode2
, op0
)
9738 op0
= force_reg (mode2
, op0
);
9740 /* Otherwise, if this is a constant, try to force it to the constant
9741 pool. Note that back-ends, e.g. MIPS, may refuse to do so if it
9742 is a legitimate constant. */
9743 else if (CONSTANT_P (op0
) && (memloc
= force_const_mem (mode2
, op0
)))
9744 op0
= validize_mem (memloc
);
9746 /* Otherwise, if this is a constant or the object is not in memory
9747 and need be, put it there. */
9748 else if (CONSTANT_P (op0
) || (!MEM_P (op0
) && must_force_mem
))
9750 tree nt
= build_qualified_type (TREE_TYPE (tem
),
9751 (TYPE_QUALS (TREE_TYPE (tem
))
9752 | TYPE_QUAL_CONST
));
9753 memloc
= assign_temp (nt
, 1, 1, 1);
9754 emit_move_insn (memloc
, op0
);
9760 enum machine_mode address_mode
;
9761 rtx offset_rtx
= expand_expr (offset
, NULL_RTX
, VOIDmode
,
9764 gcc_assert (MEM_P (op0
));
9767 = targetm
.addr_space
.address_mode (MEM_ADDR_SPACE (op0
));
9768 if (GET_MODE (offset_rtx
) != address_mode
)
9769 offset_rtx
= convert_to_mode (address_mode
, offset_rtx
, 0);
9771 if (GET_MODE (op0
) == BLKmode
9772 /* A constant address in OP0 can have VOIDmode, we must
9773 not try to call force_reg in that case. */
9774 && GET_MODE (XEXP (op0
, 0)) != VOIDmode
9776 && (bitpos
% bitsize
) == 0
9777 && (bitsize
% GET_MODE_ALIGNMENT (mode1
)) == 0
9778 && MEM_ALIGN (op0
) == GET_MODE_ALIGNMENT (mode1
))
9780 op0
= adjust_address (op0
, mode1
, bitpos
/ BITS_PER_UNIT
);
9784 op0
= offset_address (op0
, offset_rtx
,
9785 highest_pow2_factor (offset
));
9788 /* If OFFSET is making OP0 more aligned than BIGGEST_ALIGNMENT,
9789 record its alignment as BIGGEST_ALIGNMENT. */
9790 if (MEM_P (op0
) && bitpos
== 0 && offset
!= 0
9791 && is_aligning_offset (offset
, tem
))
9792 set_mem_align (op0
, BIGGEST_ALIGNMENT
);
9794 /* Don't forget about volatility even if this is a bitfield. */
9795 if (MEM_P (op0
) && volatilep
&& ! MEM_VOLATILE_P (op0
))
9797 if (op0
== orig_op0
)
9798 op0
= copy_rtx (op0
);
9800 MEM_VOLATILE_P (op0
) = 1;
9803 /* In cases where an aligned union has an unaligned object
9804 as a field, we might be extracting a BLKmode value from
9805 an integer-mode (e.g., SImode) object. Handle this case
9806 by doing the extract into an object as wide as the field
9807 (which we know to be the width of a basic mode), then
9808 storing into memory, and changing the mode to BLKmode. */
9809 if (mode1
== VOIDmode
9810 || REG_P (op0
) || GET_CODE (op0
) == SUBREG
9811 || (mode1
!= BLKmode
&& ! direct_load
[(int) mode1
]
9812 && GET_MODE_CLASS (mode
) != MODE_COMPLEX_INT
9813 && GET_MODE_CLASS (mode
) != MODE_COMPLEX_FLOAT
9814 && modifier
!= EXPAND_CONST_ADDRESS
9815 && modifier
!= EXPAND_INITIALIZER
)
9816 /* If the field is volatile, we always want an aligned
9817 access. Do this in following two situations:
9818 1. the access is not already naturally
9819 aligned, otherwise "normal" (non-bitfield) volatile fields
9820 become non-addressable.
9821 2. the bitsize is narrower than the access size. Need
9822 to extract bitfields from the access. */
9823 || (volatilep
&& flag_strict_volatile_bitfields
> 0
9824 && (bitpos
% GET_MODE_ALIGNMENT (mode
) != 0
9825 || (mode1
!= BLKmode
9826 && bitsize
< GET_MODE_SIZE (mode1
) * BITS_PER_UNIT
)))
9827 /* If the field isn't aligned enough to fetch as a memref,
9828 fetch it as a bit field. */
9829 || (mode1
!= BLKmode
9830 && (((TYPE_ALIGN (TREE_TYPE (tem
)) < GET_MODE_ALIGNMENT (mode
)
9831 || (bitpos
% GET_MODE_ALIGNMENT (mode
) != 0)
9833 && (MEM_ALIGN (op0
) < GET_MODE_ALIGNMENT (mode1
)
9834 || (bitpos
% GET_MODE_ALIGNMENT (mode1
) != 0))))
9835 && ((modifier
== EXPAND_CONST_ADDRESS
9836 || modifier
== EXPAND_INITIALIZER
)
9838 : SLOW_UNALIGNED_ACCESS (mode1
, MEM_ALIGN (op0
))))
9839 || (bitpos
% BITS_PER_UNIT
!= 0)))
9840 /* If the type and the field are a constant size and the
9841 size of the type isn't the same size as the bitfield,
9842 we must use bitfield operations. */
9844 && TYPE_SIZE (TREE_TYPE (exp
))
9845 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp
))) == INTEGER_CST
9846 && 0 != compare_tree_int (TYPE_SIZE (TREE_TYPE (exp
)),
9849 enum machine_mode ext_mode
= mode
;
9851 if (ext_mode
== BLKmode
9852 && ! (target
!= 0 && MEM_P (op0
)
9854 && bitpos
% BITS_PER_UNIT
== 0))
9855 ext_mode
= mode_for_size (bitsize
, MODE_INT
, 1);
9857 if (ext_mode
== BLKmode
)
9860 target
= assign_temp (type
, 0, 1, 1);
9865 /* In this case, BITPOS must start at a byte boundary and
9866 TARGET, if specified, must be a MEM. */
9867 gcc_assert (MEM_P (op0
)
9868 && (!target
|| MEM_P (target
))
9869 && !(bitpos
% BITS_PER_UNIT
));
9871 emit_block_move (target
,
9872 adjust_address (op0
, VOIDmode
,
9873 bitpos
/ BITS_PER_UNIT
),
9874 GEN_INT ((bitsize
+ BITS_PER_UNIT
- 1)
9876 (modifier
== EXPAND_STACK_PARM
9877 ? BLOCK_OP_CALL_PARM
: BLOCK_OP_NORMAL
));
9882 op0
= validize_mem (op0
);
9884 if (MEM_P (op0
) && REG_P (XEXP (op0
, 0)))
9885 mark_reg_pointer (XEXP (op0
, 0), MEM_ALIGN (op0
));
9887 op0
= extract_bit_field (op0
, bitsize
, bitpos
, unsignedp
, packedp
,
9888 (modifier
== EXPAND_STACK_PARM
9889 ? NULL_RTX
: target
),
9890 ext_mode
, ext_mode
);
9892 /* If the result is a record type and BITSIZE is narrower than
9893 the mode of OP0, an integral mode, and this is a big endian
9894 machine, we must put the field into the high-order bits. */
9895 if (TREE_CODE (type
) == RECORD_TYPE
&& BYTES_BIG_ENDIAN
9896 && GET_MODE_CLASS (GET_MODE (op0
)) == MODE_INT
9897 && bitsize
< (HOST_WIDE_INT
) GET_MODE_BITSIZE (GET_MODE (op0
)))
9898 op0
= expand_shift (LSHIFT_EXPR
, GET_MODE (op0
), op0
,
9899 GET_MODE_BITSIZE (GET_MODE (op0
))
9902 /* If the result type is BLKmode, store the data into a temporary
9903 of the appropriate type, but with the mode corresponding to the
9904 mode for the data we have (op0's mode). It's tempting to make
9905 this a constant type, since we know it's only being stored once,
9906 but that can cause problems if we are taking the address of this
9907 COMPONENT_REF because the MEM of any reference via that address
9908 will have flags corresponding to the type, which will not
9909 necessarily be constant. */
9910 if (mode
== BLKmode
)
9912 HOST_WIDE_INT size
= GET_MODE_BITSIZE (ext_mode
);
9915 /* If the reference doesn't use the alias set of its type,
9916 we cannot create the temporary using that type. */
9917 if (component_uses_parent_alias_set (exp
))
9919 new_rtx
= assign_stack_local (ext_mode
, size
, 0);
9920 set_mem_alias_set (new_rtx
, get_alias_set (exp
));
9923 new_rtx
= assign_stack_temp_for_type (ext_mode
, size
, 0, type
);
9925 emit_move_insn (new_rtx
, op0
);
9926 op0
= copy_rtx (new_rtx
);
9927 PUT_MODE (op0
, BLKmode
);
9928 set_mem_attributes (op0
, exp
, 1);
9934 /* If the result is BLKmode, use that to access the object
9936 if (mode
== BLKmode
)
9939 /* Get a reference to just this component. */
9940 if (modifier
== EXPAND_CONST_ADDRESS
9941 || modifier
== EXPAND_SUM
|| modifier
== EXPAND_INITIALIZER
)
9942 op0
= adjust_address_nv (op0
, mode1
, bitpos
/ BITS_PER_UNIT
);
9944 op0
= adjust_address (op0
, mode1
, bitpos
/ BITS_PER_UNIT
);
9946 if (op0
== orig_op0
)
9947 op0
= copy_rtx (op0
);
9949 set_mem_attributes (op0
, exp
, 0);
9950 if (REG_P (XEXP (op0
, 0)))
9951 mark_reg_pointer (XEXP (op0
, 0), MEM_ALIGN (op0
));
9953 MEM_VOLATILE_P (op0
) |= volatilep
;
9954 if (mode
== mode1
|| mode1
== BLKmode
|| mode1
== tmode
9955 || modifier
== EXPAND_CONST_ADDRESS
9956 || modifier
== EXPAND_INITIALIZER
)
9958 else if (target
== 0)
9959 target
= gen_reg_rtx (tmode
!= VOIDmode
? tmode
: mode
);
9961 convert_move (target
, op0
, unsignedp
);
9966 return expand_expr (OBJ_TYPE_REF_EXPR (exp
), target
, tmode
, modifier
);
9969 /* All valid uses of __builtin_va_arg_pack () are removed during
9971 if (CALL_EXPR_VA_ARG_PACK (exp
))
9972 error ("%Kinvalid use of %<__builtin_va_arg_pack ()%>", exp
);
9974 tree fndecl
= get_callee_fndecl (exp
), attr
;
9977 && (attr
= lookup_attribute ("error",
9978 DECL_ATTRIBUTES (fndecl
))) != NULL
)
9979 error ("%Kcall to %qs declared with attribute error: %s",
9980 exp
, identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 1)),
9981 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr
))));
9983 && (attr
= lookup_attribute ("warning",
9984 DECL_ATTRIBUTES (fndecl
))) != NULL
)
9985 warning_at (tree_nonartificial_location (exp
),
9986 0, "%Kcall to %qs declared with attribute warning: %s",
9987 exp
, identifier_to_locale (lang_hooks
.decl_printable_name (fndecl
, 1)),
9988 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr
))));
9990 /* Check for a built-in function. */
9991 if (fndecl
&& DECL_BUILT_IN (fndecl
))
9993 gcc_assert (DECL_BUILT_IN_CLASS (fndecl
) != BUILT_IN_FRONTEND
);
9994 return expand_builtin (exp
, target
, subtarget
, tmode
, ignore
);
9997 return expand_call (exp
, target
, ignore
);
9999 case VIEW_CONVERT_EXPR
:
10002 /* If we are converting to BLKmode, try to avoid an intermediate
10003 temporary by fetching an inner memory reference. */
10004 if (mode
== BLKmode
10005 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp
))) == INTEGER_CST
10006 && TYPE_MODE (TREE_TYPE (treeop0
)) != BLKmode
10007 && handled_component_p (treeop0
))
10009 enum machine_mode mode1
;
10010 HOST_WIDE_INT bitsize
, bitpos
;
10015 = get_inner_reference (treeop0
, &bitsize
, &bitpos
,
10016 &offset
, &mode1
, &unsignedp
, &volatilep
,
10020 /* ??? We should work harder and deal with non-zero offsets. */
10022 && (bitpos
% BITS_PER_UNIT
) == 0
10024 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp
)), bitsize
) == 0)
10026 /* See the normal_inner_ref case for the rationale. */
10028 = expand_expr (tem
,
10029 (TREE_CODE (TREE_TYPE (tem
)) == UNION_TYPE
10030 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem
)))
10032 && modifier
!= EXPAND_STACK_PARM
10033 ? target
: NULL_RTX
),
10035 (modifier
== EXPAND_INITIALIZER
10036 || modifier
== EXPAND_CONST_ADDRESS
10037 || modifier
== EXPAND_STACK_PARM
)
10038 ? modifier
: EXPAND_NORMAL
);
10040 if (MEM_P (orig_op0
))
10044 /* Get a reference to just this component. */
10045 if (modifier
== EXPAND_CONST_ADDRESS
10046 || modifier
== EXPAND_SUM
10047 || modifier
== EXPAND_INITIALIZER
)
10048 op0
= adjust_address_nv (op0
, mode
, bitpos
/ BITS_PER_UNIT
);
10050 op0
= adjust_address (op0
, mode
, bitpos
/ BITS_PER_UNIT
);
10052 if (op0
== orig_op0
)
10053 op0
= copy_rtx (op0
);
10055 set_mem_attributes (op0
, treeop0
, 0);
10056 if (REG_P (XEXP (op0
, 0)))
10057 mark_reg_pointer (XEXP (op0
, 0), MEM_ALIGN (op0
));
10059 MEM_VOLATILE_P (op0
) |= volatilep
;
10065 op0
= expand_expr (treeop0
,
10066 NULL_RTX
, VOIDmode
, modifier
);
10068 /* If the input and output modes are both the same, we are done. */
10069 if (mode
== GET_MODE (op0
))
10071 /* If neither mode is BLKmode, and both modes are the same size
10072 then we can use gen_lowpart. */
10073 else if (mode
!= BLKmode
&& GET_MODE (op0
) != BLKmode
10074 && (GET_MODE_PRECISION (mode
)
10075 == GET_MODE_PRECISION (GET_MODE (op0
)))
10076 && !COMPLEX_MODE_P (GET_MODE (op0
)))
10078 if (GET_CODE (op0
) == SUBREG
)
10079 op0
= force_reg (GET_MODE (op0
), op0
);
10080 temp
= gen_lowpart_common (mode
, op0
);
10085 if (!REG_P (op0
) && !MEM_P (op0
))
10086 op0
= force_reg (GET_MODE (op0
), op0
);
10087 op0
= gen_lowpart (mode
, op0
);
10090 /* If both types are integral, convert from one mode to the other. */
10091 else if (INTEGRAL_TYPE_P (type
) && INTEGRAL_TYPE_P (TREE_TYPE (treeop0
)))
10092 op0
= convert_modes (mode
, GET_MODE (op0
), op0
,
10093 TYPE_UNSIGNED (TREE_TYPE (treeop0
)));
10094 /* As a last resort, spill op0 to memory, and reload it in a
10096 else if (!MEM_P (op0
))
10098 /* If the operand is not a MEM, force it into memory. Since we
10099 are going to be changing the mode of the MEM, don't call
10100 force_const_mem for constants because we don't allow pool
10101 constants to change mode. */
10102 tree inner_type
= TREE_TYPE (treeop0
);
10104 gcc_assert (!TREE_ADDRESSABLE (exp
));
10106 if (target
== 0 || GET_MODE (target
) != TYPE_MODE (inner_type
))
10108 = assign_stack_temp_for_type
10109 (TYPE_MODE (inner_type
),
10110 GET_MODE_SIZE (TYPE_MODE (inner_type
)), 0, inner_type
);
10112 emit_move_insn (target
, op0
);
10116 /* At this point, OP0 is in the correct mode. If the output type is
10117 such that the operand is known to be aligned, indicate that it is.
10118 Otherwise, we need only be concerned about alignment for non-BLKmode
10122 enum insn_code icode
;
10124 op0
= copy_rtx (op0
);
10126 if (TYPE_ALIGN_OK (type
))
10127 set_mem_align (op0
, MAX (MEM_ALIGN (op0
), TYPE_ALIGN (type
)));
10128 else if (mode
!= BLKmode
10129 && MEM_ALIGN (op0
) < GET_MODE_ALIGNMENT (mode
)
10130 /* If the target does have special handling for unaligned
10131 loads of mode then use them. */
10132 && ((icode
= optab_handler (movmisalign_optab
, mode
))
10133 != CODE_FOR_nothing
))
10137 op0
= adjust_address (op0
, mode
, 0);
10138 /* We've already validated the memory, and we're creating a
10139 new pseudo destination. The predicates really can't
10141 reg
= gen_reg_rtx (mode
);
10143 /* Nor can the insn generator. */
10144 insn
= GEN_FCN (icode
) (reg
, op0
);
10148 else if (STRICT_ALIGNMENT
10150 && MEM_ALIGN (op0
) < GET_MODE_ALIGNMENT (mode
))
10152 tree inner_type
= TREE_TYPE (treeop0
);
10153 HOST_WIDE_INT temp_size
10154 = MAX (int_size_in_bytes (inner_type
),
10155 (HOST_WIDE_INT
) GET_MODE_SIZE (mode
));
10157 = assign_stack_temp_for_type (mode
, temp_size
, 0, type
);
10158 rtx new_with_op0_mode
10159 = adjust_address (new_rtx
, GET_MODE (op0
), 0);
10161 gcc_assert (!TREE_ADDRESSABLE (exp
));
10163 if (GET_MODE (op0
) == BLKmode
)
10164 emit_block_move (new_with_op0_mode
, op0
,
10165 GEN_INT (GET_MODE_SIZE (mode
)),
10166 (modifier
== EXPAND_STACK_PARM
10167 ? BLOCK_OP_CALL_PARM
: BLOCK_OP_NORMAL
));
10169 emit_move_insn (new_with_op0_mode
, op0
);
10174 op0
= adjust_address (op0
, mode
, 0);
10181 tree lhs
= treeop0
;
10182 tree rhs
= treeop1
;
10183 gcc_assert (ignore
);
10185 /* Check for |= or &= of a bitfield of size one into another bitfield
10186 of size 1. In this case, (unless we need the result of the
10187 assignment) we can do this more efficiently with a
10188 test followed by an assignment, if necessary.
10190 ??? At this point, we can't get a BIT_FIELD_REF here. But if
10191 things change so we do, this code should be enhanced to
10193 if (TREE_CODE (lhs
) == COMPONENT_REF
10194 && (TREE_CODE (rhs
) == BIT_IOR_EXPR
10195 || TREE_CODE (rhs
) == BIT_AND_EXPR
)
10196 && TREE_OPERAND (rhs
, 0) == lhs
10197 && TREE_CODE (TREE_OPERAND (rhs
, 1)) == COMPONENT_REF
10198 && integer_onep (DECL_SIZE (TREE_OPERAND (lhs
, 1)))
10199 && integer_onep (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs
, 1), 1))))
10201 rtx label
= gen_label_rtx ();
10202 int value
= TREE_CODE (rhs
) == BIT_IOR_EXPR
;
10203 do_jump (TREE_OPERAND (rhs
, 1),
10205 value
? 0 : label
, -1);
10206 expand_assignment (lhs
, build_int_cst (TREE_TYPE (rhs
), value
),
10207 MOVE_NONTEMPORAL (exp
));
10208 do_pending_stack_adjust ();
10209 emit_label (label
);
10213 expand_assignment (lhs
, rhs
, MOVE_NONTEMPORAL (exp
));
10218 return expand_expr_addr_expr (exp
, target
, tmode
, modifier
);
10220 case REALPART_EXPR
:
10221 op0
= expand_normal (treeop0
);
10222 return read_complex_part (op0
, false);
10224 case IMAGPART_EXPR
:
10225 op0
= expand_normal (treeop0
);
10226 return read_complex_part (op0
, true);
10233 /* Expanded in cfgexpand.c. */
10234 gcc_unreachable ();
10236 case TRY_CATCH_EXPR
:
10238 case EH_FILTER_EXPR
:
10239 case TRY_FINALLY_EXPR
:
10240 /* Lowered by tree-eh.c. */
10241 gcc_unreachable ();
10243 case WITH_CLEANUP_EXPR
:
10244 case CLEANUP_POINT_EXPR
:
10246 case CASE_LABEL_EXPR
:
10251 case COMPOUND_EXPR
:
10252 case PREINCREMENT_EXPR
:
10253 case PREDECREMENT_EXPR
:
10254 case POSTINCREMENT_EXPR
:
10255 case POSTDECREMENT_EXPR
:
10258 /* Lowered by gimplify.c. */
10259 gcc_unreachable ();
10262 /* Function descriptors are not valid except for as
10263 initialization constants, and should not be expanded. */
10264 gcc_unreachable ();
10266 case WITH_SIZE_EXPR
:
10267 /* WITH_SIZE_EXPR expands to its first argument. The caller should
10268 have pulled out the size to use in whatever context it needed. */
10269 return expand_expr_real (treeop0
, original_target
, tmode
,
10270 modifier
, alt_rtl
);
10272 case COMPOUND_LITERAL_EXPR
:
10274 /* Initialize the anonymous variable declared in the compound
10275 literal, then return the variable. */
10276 tree decl
= COMPOUND_LITERAL_EXPR_DECL (exp
);
10278 /* Create RTL for this variable. */
10279 if (!DECL_RTL_SET_P (decl
))
10281 if (DECL_HARD_REGISTER (decl
))
10282 /* The user specified an assembler name for this variable.
10283 Set that up now. */
10284 rest_of_decl_compilation (decl
, 0, 0);
10286 expand_decl (decl
);
10289 return expand_expr_real (decl
, original_target
, tmode
,
10290 modifier
, alt_rtl
);
10294 return expand_expr_real_2 (&ops
, target
, tmode
, modifier
);
10298 /* Subroutine of above: reduce EXP to the precision of TYPE (in the
10299 signedness of TYPE), possibly returning the result in TARGET. */
10301 reduce_to_bit_field_precision (rtx exp
, rtx target
, tree type
)
10303 HOST_WIDE_INT prec
= TYPE_PRECISION (type
);
10304 if (target
&& GET_MODE (target
) != GET_MODE (exp
))
10306 /* For constant values, reduce using build_int_cst_type. */
10307 if (CONST_INT_P (exp
))
10309 HOST_WIDE_INT value
= INTVAL (exp
);
10310 tree t
= build_int_cst_type (type
, value
);
10311 return expand_expr (t
, target
, VOIDmode
, EXPAND_NORMAL
);
10313 else if (TYPE_UNSIGNED (type
))
10315 rtx mask
= immed_double_int_const (double_int_mask (prec
),
10317 return expand_and (GET_MODE (exp
), exp
, mask
, target
);
10321 int count
= GET_MODE_PRECISION (GET_MODE (exp
)) - prec
;
10322 exp
= expand_shift (LSHIFT_EXPR
, GET_MODE (exp
),
10323 exp
, count
, target
, 0);
10324 return expand_shift (RSHIFT_EXPR
, GET_MODE (exp
),
10325 exp
, count
, target
, 0);
10329 /* Subroutine of above: returns 1 if OFFSET corresponds to an offset that
10330 when applied to the address of EXP produces an address known to be
10331 aligned more than BIGGEST_ALIGNMENT. */
10334 is_aligning_offset (const_tree offset
, const_tree exp
)
10336 /* Strip off any conversions. */
10337 while (CONVERT_EXPR_P (offset
))
10338 offset
= TREE_OPERAND (offset
, 0);
10340 /* We must now have a BIT_AND_EXPR with a constant that is one less than
10341 power of 2 and which is larger than BIGGEST_ALIGNMENT. */
10342 if (TREE_CODE (offset
) != BIT_AND_EXPR
10343 || !host_integerp (TREE_OPERAND (offset
, 1), 1)
10344 || compare_tree_int (TREE_OPERAND (offset
, 1),
10345 BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) <= 0
10346 || !exact_log2 (tree_low_cst (TREE_OPERAND (offset
, 1), 1) + 1) < 0)
10349 /* Look at the first operand of BIT_AND_EXPR and strip any conversion.
10350 It must be NEGATE_EXPR. Then strip any more conversions. */
10351 offset
= TREE_OPERAND (offset
, 0);
10352 while (CONVERT_EXPR_P (offset
))
10353 offset
= TREE_OPERAND (offset
, 0);
10355 if (TREE_CODE (offset
) != NEGATE_EXPR
)
10358 offset
= TREE_OPERAND (offset
, 0);
10359 while (CONVERT_EXPR_P (offset
))
10360 offset
= TREE_OPERAND (offset
, 0);
10362 /* This must now be the address of EXP. */
10363 return TREE_CODE (offset
) == ADDR_EXPR
&& TREE_OPERAND (offset
, 0) == exp
;
10366 /* Return the tree node if an ARG corresponds to a string constant or zero
10367 if it doesn't. If we return nonzero, set *PTR_OFFSET to the offset
10368 in bytes within the string that ARG is accessing. The type of the
10369 offset will be `sizetype'. */
10372 string_constant (tree arg
, tree
*ptr_offset
)
10374 tree array
, offset
, lower_bound
;
10377 if (TREE_CODE (arg
) == ADDR_EXPR
)
10379 if (TREE_CODE (TREE_OPERAND (arg
, 0)) == STRING_CST
)
10381 *ptr_offset
= size_zero_node
;
10382 return TREE_OPERAND (arg
, 0);
10384 else if (TREE_CODE (TREE_OPERAND (arg
, 0)) == VAR_DECL
)
10386 array
= TREE_OPERAND (arg
, 0);
10387 offset
= size_zero_node
;
10389 else if (TREE_CODE (TREE_OPERAND (arg
, 0)) == ARRAY_REF
)
10391 array
= TREE_OPERAND (TREE_OPERAND (arg
, 0), 0);
10392 offset
= TREE_OPERAND (TREE_OPERAND (arg
, 0), 1);
10393 if (TREE_CODE (array
) != STRING_CST
10394 && TREE_CODE (array
) != VAR_DECL
)
10397 /* Check if the array has a nonzero lower bound. */
10398 lower_bound
= array_ref_low_bound (TREE_OPERAND (arg
, 0));
10399 if (!integer_zerop (lower_bound
))
10401 /* If the offset and base aren't both constants, return 0. */
10402 if (TREE_CODE (lower_bound
) != INTEGER_CST
)
10404 if (TREE_CODE (offset
) != INTEGER_CST
)
10406 /* Adjust offset by the lower bound. */
10407 offset
= size_diffop (fold_convert (sizetype
, offset
),
10408 fold_convert (sizetype
, lower_bound
));
10411 else if (TREE_CODE (TREE_OPERAND (arg
, 0)) == MEM_REF
)
10413 array
= TREE_OPERAND (TREE_OPERAND (arg
, 0), 0);
10414 offset
= TREE_OPERAND (TREE_OPERAND (arg
, 0), 1);
10415 if (TREE_CODE (array
) != ADDR_EXPR
)
10417 array
= TREE_OPERAND (array
, 0);
10418 if (TREE_CODE (array
) != STRING_CST
10419 && TREE_CODE (array
) != VAR_DECL
)
10425 else if (TREE_CODE (arg
) == PLUS_EXPR
|| TREE_CODE (arg
) == POINTER_PLUS_EXPR
)
10427 tree arg0
= TREE_OPERAND (arg
, 0);
10428 tree arg1
= TREE_OPERAND (arg
, 1);
10433 if (TREE_CODE (arg0
) == ADDR_EXPR
10434 && (TREE_CODE (TREE_OPERAND (arg0
, 0)) == STRING_CST
10435 || TREE_CODE (TREE_OPERAND (arg0
, 0)) == VAR_DECL
))
10437 array
= TREE_OPERAND (arg0
, 0);
10440 else if (TREE_CODE (arg1
) == ADDR_EXPR
10441 && (TREE_CODE (TREE_OPERAND (arg1
, 0)) == STRING_CST
10442 || TREE_CODE (TREE_OPERAND (arg1
, 0)) == VAR_DECL
))
10444 array
= TREE_OPERAND (arg1
, 0);
10453 if (TREE_CODE (array
) == STRING_CST
)
10455 *ptr_offset
= fold_convert (sizetype
, offset
);
10458 else if (TREE_CODE (array
) == VAR_DECL
10459 || TREE_CODE (array
) == CONST_DECL
)
10463 /* Variables initialized to string literals can be handled too. */
10464 if (!const_value_known_p (array
)
10465 || !DECL_INITIAL (array
)
10466 || TREE_CODE (DECL_INITIAL (array
)) != STRING_CST
)
10469 /* Avoid const char foo[4] = "abcde"; */
10470 if (DECL_SIZE_UNIT (array
) == NULL_TREE
10471 || TREE_CODE (DECL_SIZE_UNIT (array
)) != INTEGER_CST
10472 || (length
= TREE_STRING_LENGTH (DECL_INITIAL (array
))) <= 0
10473 || compare_tree_int (DECL_SIZE_UNIT (array
), length
) < 0)
10476 /* If variable is bigger than the string literal, OFFSET must be constant
10477 and inside of the bounds of the string literal. */
10478 offset
= fold_convert (sizetype
, offset
);
10479 if (compare_tree_int (DECL_SIZE_UNIT (array
), length
) > 0
10480 && (! host_integerp (offset
, 1)
10481 || compare_tree_int (offset
, length
) >= 0))
10484 *ptr_offset
= offset
;
10485 return DECL_INITIAL (array
);
10491 /* Generate code to calculate OPS, and exploded expression
10492 using a store-flag instruction and return an rtx for the result.
10493 OPS reflects a comparison.
10495 If TARGET is nonzero, store the result there if convenient.
10497 Return zero if there is no suitable set-flag instruction
10498 available on this machine.
10500 Once expand_expr has been called on the arguments of the comparison,
10501 we are committed to doing the store flag, since it is not safe to
10502 re-evaluate the expression. We emit the store-flag insn by calling
10503 emit_store_flag, but only expand the arguments if we have a reason
10504 to believe that emit_store_flag will be successful. If we think that
10505 it will, but it isn't, we have to simulate the store-flag with a
10506 set/jump/set sequence. */
10509 do_store_flag (sepops ops
, rtx target
, enum machine_mode mode
)
10511 enum rtx_code code
;
10512 tree arg0
, arg1
, type
;
10514 enum machine_mode operand_mode
;
10517 rtx subtarget
= target
;
10518 location_t loc
= ops
->location
;
10523 /* Don't crash if the comparison was erroneous. */
10524 if (arg0
== error_mark_node
|| arg1
== error_mark_node
)
10527 type
= TREE_TYPE (arg0
);
10528 operand_mode
= TYPE_MODE (type
);
10529 unsignedp
= TYPE_UNSIGNED (type
);
10531 /* We won't bother with BLKmode store-flag operations because it would mean
10532 passing a lot of information to emit_store_flag. */
10533 if (operand_mode
== BLKmode
)
10536 /* We won't bother with store-flag operations involving function pointers
10537 when function pointers must be canonicalized before comparisons. */
10538 #ifdef HAVE_canonicalize_funcptr_for_compare
10539 if (HAVE_canonicalize_funcptr_for_compare
10540 && ((TREE_CODE (TREE_TYPE (arg0
)) == POINTER_TYPE
10541 && (TREE_CODE (TREE_TYPE (TREE_TYPE (arg0
)))
10543 || (TREE_CODE (TREE_TYPE (arg1
)) == POINTER_TYPE
10544 && (TREE_CODE (TREE_TYPE (TREE_TYPE (arg1
)))
10545 == FUNCTION_TYPE
))))
10552 /* For vector typed comparisons emit code to generate the desired
10553 all-ones or all-zeros mask. Conveniently use the VEC_COND_EXPR
10554 expander for this. */
10555 if (TREE_CODE (ops
->type
) == VECTOR_TYPE
)
10557 tree ifexp
= build2 (ops
->code
, ops
->type
, arg0
, arg1
);
10558 tree if_true
= constant_boolean_node (true, ops
->type
);
10559 tree if_false
= constant_boolean_node (false, ops
->type
);
10560 return expand_vec_cond_expr (ops
->type
, ifexp
, if_true
, if_false
, target
);
10563 /* For vector typed comparisons emit code to generate the desired
10564 all-ones or all-zeros mask. Conveniently use the VEC_COND_EXPR
10565 expander for this. */
10566 if (TREE_CODE (ops
->type
) == VECTOR_TYPE
)
10568 tree ifexp
= build2 (ops
->code
, ops
->type
, arg0
, arg1
);
10569 tree if_true
= constant_boolean_node (true, ops
->type
);
10570 tree if_false
= constant_boolean_node (false, ops
->type
);
10571 return expand_vec_cond_expr (ops
->type
, ifexp
, if_true
, if_false
, target
);
10574 /* Get the rtx comparison code to use. We know that EXP is a comparison
10575 operation of some type. Some comparisons against 1 and -1 can be
10576 converted to comparisons with zero. Do so here so that the tests
10577 below will be aware that we have a comparison with zero. These
10578 tests will not catch constants in the first operand, but constants
10579 are rarely passed as the first operand. */
10590 if (integer_onep (arg1
))
10591 arg1
= integer_zero_node
, code
= unsignedp
? LEU
: LE
;
10593 code
= unsignedp
? LTU
: LT
;
10596 if (! unsignedp
&& integer_all_onesp (arg1
))
10597 arg1
= integer_zero_node
, code
= LT
;
10599 code
= unsignedp
? LEU
: LE
;
10602 if (! unsignedp
&& integer_all_onesp (arg1
))
10603 arg1
= integer_zero_node
, code
= GE
;
10605 code
= unsignedp
? GTU
: GT
;
10608 if (integer_onep (arg1
))
10609 arg1
= integer_zero_node
, code
= unsignedp
? GTU
: GT
;
10611 code
= unsignedp
? GEU
: GE
;
10614 case UNORDERED_EXPR
:
10640 gcc_unreachable ();
10643 /* Put a constant second. */
10644 if (TREE_CODE (arg0
) == REAL_CST
|| TREE_CODE (arg0
) == INTEGER_CST
10645 || TREE_CODE (arg0
) == FIXED_CST
)
10647 tem
= arg0
; arg0
= arg1
; arg1
= tem
;
10648 code
= swap_condition (code
);
10651 /* If this is an equality or inequality test of a single bit, we can
10652 do this by shifting the bit being tested to the low-order bit and
10653 masking the result with the constant 1. If the condition was EQ,
10654 we xor it with 1. This does not require an scc insn and is faster
10655 than an scc insn even if we have it.
10657 The code to make this transformation was moved into fold_single_bit_test,
10658 so we just call into the folder and expand its result. */
10660 if ((code
== NE
|| code
== EQ
)
10661 && integer_zerop (arg1
)
10662 && (TYPE_PRECISION (ops
->type
) != 1 || TYPE_UNSIGNED (ops
->type
)))
10664 gimple srcstmt
= get_def_for_expr (arg0
, BIT_AND_EXPR
);
10666 && integer_pow2p (gimple_assign_rhs2 (srcstmt
)))
10668 enum tree_code tcode
= code
== NE
? NE_EXPR
: EQ_EXPR
;
10669 tree type
= lang_hooks
.types
.type_for_mode (mode
, unsignedp
);
10670 tree temp
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg1
),
10671 gimple_assign_rhs1 (srcstmt
),
10672 gimple_assign_rhs2 (srcstmt
));
10673 temp
= fold_single_bit_test (loc
, tcode
, temp
, arg1
, type
);
10675 return expand_expr (temp
, target
, VOIDmode
, EXPAND_NORMAL
);
10679 if (! get_subtarget (target
)
10680 || GET_MODE (subtarget
) != operand_mode
)
10683 expand_operands (arg0
, arg1
, subtarget
, &op0
, &op1
, EXPAND_NORMAL
);
10686 target
= gen_reg_rtx (mode
);
10688 /* Try a cstore if possible. */
10689 return emit_store_flag_force (target
, code
, op0
, op1
,
10690 operand_mode
, unsignedp
,
10691 (TYPE_PRECISION (ops
->type
) == 1
10692 && !TYPE_UNSIGNED (ops
->type
)) ? -1 : 1);
10696 /* Stubs in case we haven't got a casesi insn. */
10697 #ifndef HAVE_casesi
10698 # define HAVE_casesi 0
10699 # define gen_casesi(a, b, c, d, e) (0)
10700 # define CODE_FOR_casesi CODE_FOR_nothing
10703 /* Attempt to generate a casesi instruction. Returns 1 if successful,
10704 0 otherwise (i.e. if there is no casesi instruction). */
10706 try_casesi (tree index_type
, tree index_expr
, tree minval
, tree range
,
10707 rtx table_label ATTRIBUTE_UNUSED
, rtx default_label
,
10708 rtx fallback_label ATTRIBUTE_UNUSED
)
10710 struct expand_operand ops
[5];
10711 enum machine_mode index_mode
= SImode
;
10712 int index_bits
= GET_MODE_BITSIZE (index_mode
);
10713 rtx op1
, op2
, index
;
10718 /* Convert the index to SImode. */
10719 if (GET_MODE_BITSIZE (TYPE_MODE (index_type
)) > GET_MODE_BITSIZE (index_mode
))
10721 enum machine_mode omode
= TYPE_MODE (index_type
);
10722 rtx rangertx
= expand_normal (range
);
10724 /* We must handle the endpoints in the original mode. */
10725 index_expr
= build2 (MINUS_EXPR
, index_type
,
10726 index_expr
, minval
);
10727 minval
= integer_zero_node
;
10728 index
= expand_normal (index_expr
);
10730 emit_cmp_and_jump_insns (rangertx
, index
, LTU
, NULL_RTX
,
10731 omode
, 1, default_label
);
10732 /* Now we can safely truncate. */
10733 index
= convert_to_mode (index_mode
, index
, 0);
10737 if (TYPE_MODE (index_type
) != index_mode
)
10739 index_type
= lang_hooks
.types
.type_for_size (index_bits
, 0);
10740 index_expr
= fold_convert (index_type
, index_expr
);
10743 index
= expand_normal (index_expr
);
10746 do_pending_stack_adjust ();
10748 op1
= expand_normal (minval
);
10749 op2
= expand_normal (range
);
10751 create_input_operand (&ops
[0], index
, index_mode
);
10752 create_convert_operand_from_type (&ops
[1], op1
, TREE_TYPE (minval
));
10753 create_convert_operand_from_type (&ops
[2], op2
, TREE_TYPE (range
));
10754 create_fixed_operand (&ops
[3], table_label
);
10755 create_fixed_operand (&ops
[4], (default_label
10757 : fallback_label
));
10758 expand_jump_insn (CODE_FOR_casesi
, 5, ops
);
10762 /* Attempt to generate a tablejump instruction; same concept. */
10763 #ifndef HAVE_tablejump
10764 #define HAVE_tablejump 0
10765 #define gen_tablejump(x, y) (0)
10768 /* Subroutine of the next function.
10770 INDEX is the value being switched on, with the lowest value
10771 in the table already subtracted.
10772 MODE is its expected mode (needed if INDEX is constant).
10773 RANGE is the length of the jump table.
10774 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
10776 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
10777 index value is out of range. */
10780 do_tablejump (rtx index
, enum machine_mode mode
, rtx range
, rtx table_label
,
10785 if (INTVAL (range
) > cfun
->cfg
->max_jumptable_ents
)
10786 cfun
->cfg
->max_jumptable_ents
= INTVAL (range
);
10788 /* Do an unsigned comparison (in the proper mode) between the index
10789 expression and the value which represents the length of the range.
10790 Since we just finished subtracting the lower bound of the range
10791 from the index expression, this comparison allows us to simultaneously
10792 check that the original index expression value is both greater than
10793 or equal to the minimum value of the range and less than or equal to
10794 the maximum value of the range. */
10797 emit_cmp_and_jump_insns (index
, range
, GTU
, NULL_RTX
, mode
, 1,
10800 /* If index is in range, it must fit in Pmode.
10801 Convert to Pmode so we can index with it. */
10803 index
= convert_to_mode (Pmode
, index
, 1);
10805 /* Don't let a MEM slip through, because then INDEX that comes
10806 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
10807 and break_out_memory_refs will go to work on it and mess it up. */
10808 #ifdef PIC_CASE_VECTOR_ADDRESS
10809 if (flag_pic
&& !REG_P (index
))
10810 index
= copy_to_mode_reg (Pmode
, index
);
10813 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
10814 GET_MODE_SIZE, because this indicates how large insns are. The other
10815 uses should all be Pmode, because they are addresses. This code
10816 could fail if addresses and insns are not the same size. */
10817 index
= gen_rtx_PLUS (Pmode
,
10818 gen_rtx_MULT (Pmode
, index
,
10819 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE
))),
10820 gen_rtx_LABEL_REF (Pmode
, table_label
));
10821 #ifdef PIC_CASE_VECTOR_ADDRESS
10823 index
= PIC_CASE_VECTOR_ADDRESS (index
);
10826 index
= memory_address (CASE_VECTOR_MODE
, index
);
10827 temp
= gen_reg_rtx (CASE_VECTOR_MODE
);
10828 vector
= gen_const_mem (CASE_VECTOR_MODE
, index
);
10829 convert_move (temp
, vector
, 0);
10831 emit_jump_insn (gen_tablejump (temp
, table_label
));
10833 /* If we are generating PIC code or if the table is PC-relative, the
10834 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
10835 if (! CASE_VECTOR_PC_RELATIVE
&& ! flag_pic
)
10840 try_tablejump (tree index_type
, tree index_expr
, tree minval
, tree range
,
10841 rtx table_label
, rtx default_label
)
10845 if (! HAVE_tablejump
)
10848 index_expr
= fold_build2 (MINUS_EXPR
, index_type
,
10849 fold_convert (index_type
, index_expr
),
10850 fold_convert (index_type
, minval
));
10851 index
= expand_normal (index_expr
);
10852 do_pending_stack_adjust ();
10854 do_tablejump (index
, TYPE_MODE (index_type
),
10855 convert_modes (TYPE_MODE (index_type
),
10856 TYPE_MODE (TREE_TYPE (range
)),
10857 expand_normal (range
),
10858 TYPE_UNSIGNED (TREE_TYPE (range
))),
10859 table_label
, default_label
);
10863 /* Return a CONST_VECTOR rtx for a VECTOR_CST tree. */
10865 const_vector_from_tree (tree exp
)
10870 enum machine_mode inner
, mode
;
10872 mode
= TYPE_MODE (TREE_TYPE (exp
));
10874 if (initializer_zerop (exp
))
10875 return CONST0_RTX (mode
);
10877 units
= GET_MODE_NUNITS (mode
);
10878 inner
= GET_MODE_INNER (mode
);
10880 v
= rtvec_alloc (units
);
10882 link
= TREE_VECTOR_CST_ELTS (exp
);
10883 for (i
= 0; link
; link
= TREE_CHAIN (link
), ++i
)
10885 elt
= TREE_VALUE (link
);
10887 if (TREE_CODE (elt
) == REAL_CST
)
10888 RTVEC_ELT (v
, i
) = CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (elt
),
10890 else if (TREE_CODE (elt
) == FIXED_CST
)
10891 RTVEC_ELT (v
, i
) = CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (elt
),
10894 RTVEC_ELT (v
, i
) = immed_double_int_const (tree_to_double_int (elt
),
10898 /* Initialize remaining elements to 0. */
10899 for (; i
< units
; ++i
)
10900 RTVEC_ELT (v
, i
) = CONST0_RTX (inner
);
10902 return gen_rtx_CONST_VECTOR (mode
, v
);
10905 /* Build a decl for a personality function given a language prefix. */
10908 build_personality_function (const char *lang
)
10910 const char *unwind_and_version
;
10914 switch (targetm_common
.except_unwind_info (&global_options
))
10919 unwind_and_version
= "_sj0";
10923 unwind_and_version
= "_v0";
10926 gcc_unreachable ();
10929 name
= ACONCAT (("__", lang
, "_personality", unwind_and_version
, NULL
));
10931 type
= build_function_type_list (integer_type_node
, integer_type_node
,
10932 long_long_unsigned_type_node
,
10933 ptr_type_node
, ptr_type_node
, NULL_TREE
);
10934 decl
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
10935 get_identifier (name
), type
);
10936 DECL_ARTIFICIAL (decl
) = 1;
10937 DECL_EXTERNAL (decl
) = 1;
10938 TREE_PUBLIC (decl
) = 1;
10940 /* Zap the nonsensical SYMBOL_REF_DECL for this. What we're left with
10941 are the flags assigned by targetm.encode_section_info. */
10942 SET_SYMBOL_REF_DECL (XEXP (DECL_RTL (decl
), 0), NULL
);
10947 /* Extracts the personality function of DECL and returns the corresponding
10951 get_personality_function (tree decl
)
10953 tree personality
= DECL_FUNCTION_PERSONALITY (decl
);
10954 enum eh_personality_kind pk
;
10956 pk
= function_needs_eh_personality (DECL_STRUCT_FUNCTION (decl
));
10957 if (pk
== eh_personality_none
)
10961 && pk
== eh_personality_any
)
10962 personality
= lang_hooks
.eh_personality ();
10964 if (pk
== eh_personality_lang
)
10965 gcc_assert (personality
!= NULL_TREE
);
10967 return XEXP (DECL_RTL (personality
), 0);
10970 #include "gt-expr.h"