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
4 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"
32 #include "hard-reg-set.h"
35 #include "insn-config.h"
36 #include "insn-attr.h"
37 /* Include expr.h after insn-config.h so we get HAVE_conditional_move. */
44 #include "typeclass.h"
47 #include "langhooks.h"
50 #include "tree-iterator.h"
51 #include "tree-pass.h"
52 #include "tree-flow.h"
56 #include "diagnostic.h"
57 #include "ssaexpand.h"
59 /* Decide whether a function's arguments should be processed
60 from first to last or from last to first.
62 They should if the stack and args grow in opposite directions, but
63 only if we have push insns. */
67 #ifndef PUSH_ARGS_REVERSED
68 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
69 #define PUSH_ARGS_REVERSED /* If it's last to first. */
75 #ifndef STACK_PUSH_CODE
76 #ifdef STACK_GROWS_DOWNWARD
77 #define STACK_PUSH_CODE PRE_DEC
79 #define STACK_PUSH_CODE PRE_INC
84 /* If this is nonzero, we do not bother generating VOLATILE
85 around volatile memory references, and we are willing to
86 output indirect addresses. If cse is to follow, we reject
87 indirect addresses so a useful potential cse is generated;
88 if it is used only once, instruction combination will produce
89 the same indirect address eventually. */
92 /* This structure is used by move_by_pieces to describe the move to
94 struct move_by_pieces_d
103 int explicit_inc_from;
104 unsigned HOST_WIDE_INT len;
105 HOST_WIDE_INT offset;
109 /* This structure is used by store_by_pieces to describe the clear to
112 struct store_by_pieces_d
118 unsigned HOST_WIDE_INT len;
119 HOST_WIDE_INT offset;
120 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode);
125 static unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
128 static void move_by_pieces_1 (rtx (*) (rtx, ...), enum machine_mode,
129 struct move_by_pieces_d *);
130 static bool block_move_libcall_safe_for_call_parm (void);
131 static bool emit_block_move_via_movmem (rtx, rtx, rtx, unsigned, unsigned, HOST_WIDE_INT);
132 static tree emit_block_move_libcall_fn (int);
133 static void emit_block_move_via_loop (rtx, rtx, rtx, unsigned);
134 static rtx clear_by_pieces_1 (void *, HOST_WIDE_INT, enum machine_mode);
135 static void clear_by_pieces (rtx, unsigned HOST_WIDE_INT, unsigned int);
136 static void store_by_pieces_1 (struct store_by_pieces_d *, unsigned int);
137 static void store_by_pieces_2 (rtx (*) (rtx, ...), enum machine_mode,
138 struct store_by_pieces_d *);
139 static tree clear_storage_libcall_fn (int);
140 static rtx compress_float_constant (rtx, rtx);
141 static rtx get_subtarget (rtx);
142 static void store_constructor_field (rtx, unsigned HOST_WIDE_INT,
143 HOST_WIDE_INT, enum machine_mode,
144 tree, tree, int, alias_set_type);
145 static void store_constructor (tree, rtx, int, HOST_WIDE_INT);
146 static rtx store_field (rtx, HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode,
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 /* Record for each mode whether we can move a register directly to or
164 from an object of that mode in memory. If we can't, we won't try
165 to use that mode directly when accessing a field of that mode. */
167 static char direct_load[NUM_MACHINE_MODES];
168 static char direct_store[NUM_MACHINE_MODES];
170 /* Record for each mode whether we can float-extend from memory. */
172 static bool float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
174 /* This macro is used to determine whether move_by_pieces should be called
175 to perform a structure copy. */
176 #ifndef MOVE_BY_PIECES_P
177 #define MOVE_BY_PIECES_P(SIZE, ALIGN) \
178 (move_by_pieces_ninsns (SIZE, ALIGN, MOVE_MAX_PIECES + 1) \
179 < (unsigned int) MOVE_RATIO (optimize_insn_for_speed_p ()))
182 /* This macro is used to determine whether clear_by_pieces should be
183 called to clear storage. */
184 #ifndef CLEAR_BY_PIECES_P
185 #define CLEAR_BY_PIECES_P(SIZE, ALIGN) \
186 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
187 < (unsigned int) CLEAR_RATIO (optimize_insn_for_speed_p ()))
190 /* This macro is used to determine whether store_by_pieces should be
191 called to "memset" storage with byte values other than zero. */
192 #ifndef SET_BY_PIECES_P
193 #define SET_BY_PIECES_P(SIZE, ALIGN) \
194 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
195 < (unsigned int) SET_RATIO (optimize_insn_for_speed_p ()))
198 /* This macro is used to determine whether store_by_pieces should be
199 called to "memcpy" storage when the source is a constant string. */
200 #ifndef STORE_BY_PIECES_P
201 #define STORE_BY_PIECES_P(SIZE, ALIGN) \
202 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
203 < (unsigned int) MOVE_RATIO (optimize_insn_for_speed_p ()))
206 /* This array records the insn_code of insns to perform block moves. */
207 enum insn_code movmem_optab[NUM_MACHINE_MODES];
209 /* This array records the insn_code of insns to perform block sets. */
210 enum insn_code setmem_optab[NUM_MACHINE_MODES];
212 /* These arrays record the insn_code of three different kinds of insns
213 to perform block compares. */
214 enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
215 enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
216 enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
218 /* Synchronization primitives. */
219 enum insn_code sync_add_optab[NUM_MACHINE_MODES];
220 enum insn_code sync_sub_optab[NUM_MACHINE_MODES];
221 enum insn_code sync_ior_optab[NUM_MACHINE_MODES];
222 enum insn_code sync_and_optab[NUM_MACHINE_MODES];
223 enum insn_code sync_xor_optab[NUM_MACHINE_MODES];
224 enum insn_code sync_nand_optab[NUM_MACHINE_MODES];
225 enum insn_code sync_old_add_optab[NUM_MACHINE_MODES];
226 enum insn_code sync_old_sub_optab[NUM_MACHINE_MODES];
227 enum insn_code sync_old_ior_optab[NUM_MACHINE_MODES];
228 enum insn_code sync_old_and_optab[NUM_MACHINE_MODES];
229 enum insn_code sync_old_xor_optab[NUM_MACHINE_MODES];
230 enum insn_code sync_old_nand_optab[NUM_MACHINE_MODES];
231 enum insn_code sync_new_add_optab[NUM_MACHINE_MODES];
232 enum insn_code sync_new_sub_optab[NUM_MACHINE_MODES];
233 enum insn_code sync_new_ior_optab[NUM_MACHINE_MODES];
234 enum insn_code sync_new_and_optab[NUM_MACHINE_MODES];
235 enum insn_code sync_new_xor_optab[NUM_MACHINE_MODES];
236 enum insn_code sync_new_nand_optab[NUM_MACHINE_MODES];
237 enum insn_code sync_compare_and_swap[NUM_MACHINE_MODES];
238 enum insn_code sync_lock_test_and_set[NUM_MACHINE_MODES];
239 enum insn_code sync_lock_release[NUM_MACHINE_MODES];
241 /* SLOW_UNALIGNED_ACCESS is nonzero if unaligned accesses are very slow. */
243 #ifndef SLOW_UNALIGNED_ACCESS
244 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) STRICT_ALIGNMENT
247 /* This is run to set up which modes can be used
248 directly in memory and to initialize the block move optab. It is run
249 at the beginning of compilation and when the target is reinitialized. */
252 init_expr_target (void)
255 enum machine_mode mode;
260 /* Try indexing by frame ptr and try by stack ptr.
261 It is known that on the Convex the stack ptr isn't a valid index.
262 With luck, one or the other is valid on any machine. */
263 mem = gen_rtx_MEM (VOIDmode, stack_pointer_rtx);
264 mem1 = gen_rtx_MEM (VOIDmode, frame_pointer_rtx);
266 /* A scratch register we can modify in-place below to avoid
267 useless RTL allocations. */
268 reg = gen_rtx_REG (VOIDmode, -1);
270 insn = rtx_alloc (INSN);
271 pat = gen_rtx_SET (VOIDmode, NULL_RTX, NULL_RTX);
272 PATTERN (insn) = pat;
274 for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES;
275 mode = (enum machine_mode) ((int) mode + 1))
279 direct_load[(int) mode] = direct_store[(int) mode] = 0;
280 PUT_MODE (mem, mode);
281 PUT_MODE (mem1, mode);
282 PUT_MODE (reg, mode);
284 /* See if there is some register that can be used in this mode and
285 directly loaded or stored from memory. */
287 if (mode != VOIDmode && mode != BLKmode)
288 for (regno = 0; regno < FIRST_PSEUDO_REGISTER
289 && (direct_load[(int) mode] == 0 || direct_store[(int) mode] == 0);
292 if (! HARD_REGNO_MODE_OK (regno, mode))
295 SET_REGNO (reg, regno);
298 SET_DEST (pat) = reg;
299 if (recog (pat, insn, &num_clobbers) >= 0)
300 direct_load[(int) mode] = 1;
302 SET_SRC (pat) = mem1;
303 SET_DEST (pat) = reg;
304 if (recog (pat, insn, &num_clobbers) >= 0)
305 direct_load[(int) mode] = 1;
308 SET_DEST (pat) = mem;
309 if (recog (pat, insn, &num_clobbers) >= 0)
310 direct_store[(int) mode] = 1;
313 SET_DEST (pat) = mem1;
314 if (recog (pat, insn, &num_clobbers) >= 0)
315 direct_store[(int) mode] = 1;
319 mem = gen_rtx_MEM (VOIDmode, gen_rtx_raw_REG (Pmode, 10000));
321 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
322 mode = GET_MODE_WIDER_MODE (mode))
324 enum machine_mode srcmode;
325 for (srcmode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); srcmode != mode;
326 srcmode = GET_MODE_WIDER_MODE (srcmode))
330 ic = can_extend_p (mode, srcmode, 0);
331 if (ic == CODE_FOR_nothing)
334 PUT_MODE (mem, srcmode);
336 if ((*insn_data[ic].operand[1].predicate) (mem, srcmode))
337 float_extend_from_mem[mode][srcmode] = true;
342 /* This is run at the start of compiling a function. */
347 memset (&crtl->expr, 0, sizeof (crtl->expr));
350 /* Copy data from FROM to TO, where the machine modes are not the same.
351 Both modes may be integer, or both may be floating, or both may be
353 UNSIGNEDP should be nonzero if FROM is an unsigned type.
354 This causes zero-extension instead of sign-extension. */
357 convert_move (rtx to, rtx from, int unsignedp)
359 enum machine_mode to_mode = GET_MODE (to);
360 enum machine_mode from_mode = GET_MODE (from);
361 int to_real = SCALAR_FLOAT_MODE_P (to_mode);
362 int from_real = SCALAR_FLOAT_MODE_P (from_mode);
366 /* rtx code for making an equivalent value. */
367 enum rtx_code equiv_code = (unsignedp < 0 ? UNKNOWN
368 : (unsignedp ? ZERO_EXTEND : SIGN_EXTEND));
371 gcc_assert (to_real == from_real);
372 gcc_assert (to_mode != BLKmode);
373 gcc_assert (from_mode != BLKmode);
375 /* If the source and destination are already the same, then there's
380 /* If FROM is a SUBREG that indicates that we have already done at least
381 the required extension, strip it. We don't handle such SUBREGs as
384 if (GET_CODE (from) == SUBREG && SUBREG_PROMOTED_VAR_P (from)
385 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (from)))
386 >= GET_MODE_SIZE (to_mode))
387 && SUBREG_PROMOTED_UNSIGNED_P (from) == unsignedp)
388 from = gen_lowpart (to_mode, from), from_mode = to_mode;
390 gcc_assert (GET_CODE (to) != SUBREG || !SUBREG_PROMOTED_VAR_P (to));
392 if (to_mode == from_mode
393 || (from_mode == VOIDmode && CONSTANT_P (from)))
395 emit_move_insn (to, from);
399 if (VECTOR_MODE_P (to_mode) || VECTOR_MODE_P (from_mode))
401 gcc_assert (GET_MODE_BITSIZE (from_mode) == GET_MODE_BITSIZE (to_mode));
403 if (VECTOR_MODE_P (to_mode))
404 from = simplify_gen_subreg (to_mode, from, GET_MODE (from), 0);
406 to = simplify_gen_subreg (from_mode, to, GET_MODE (to), 0);
408 emit_move_insn (to, from);
412 if (GET_CODE (to) == CONCAT && GET_CODE (from) == CONCAT)
414 convert_move (XEXP (to, 0), XEXP (from, 0), unsignedp);
415 convert_move (XEXP (to, 1), XEXP (from, 1), unsignedp);
424 gcc_assert ((GET_MODE_PRECISION (from_mode)
425 != GET_MODE_PRECISION (to_mode))
426 || (DECIMAL_FLOAT_MODE_P (from_mode)
427 != DECIMAL_FLOAT_MODE_P (to_mode)));
429 if (GET_MODE_PRECISION (from_mode) == GET_MODE_PRECISION (to_mode))
430 /* Conversion between decimal float and binary float, same size. */
431 tab = DECIMAL_FLOAT_MODE_P (from_mode) ? trunc_optab : sext_optab;
432 else if (GET_MODE_PRECISION (from_mode) < GET_MODE_PRECISION (to_mode))
437 /* Try converting directly if the insn is supported. */
439 code = convert_optab_handler (tab, to_mode, from_mode)->insn_code;
440 if (code != CODE_FOR_nothing)
442 emit_unop_insn (code, to, from,
443 tab == sext_optab ? FLOAT_EXTEND : FLOAT_TRUNCATE);
447 /* Otherwise use a libcall. */
448 libcall = convert_optab_libfunc (tab, to_mode, from_mode);
450 /* Is this conversion implemented yet? */
451 gcc_assert (libcall);
454 value = emit_library_call_value (libcall, NULL_RTX, LCT_CONST, to_mode,
456 insns = get_insns ();
458 emit_libcall_block (insns, to, value,
459 tab == trunc_optab ? gen_rtx_FLOAT_TRUNCATE (to_mode,
461 : gen_rtx_FLOAT_EXTEND (to_mode, from));
465 /* Handle pointer conversion. */ /* SPEE 900220. */
466 /* Targets are expected to provide conversion insns between PxImode and
467 xImode for all MODE_PARTIAL_INT modes they use, but no others. */
468 if (GET_MODE_CLASS (to_mode) == MODE_PARTIAL_INT)
470 enum machine_mode full_mode
471 = smallest_mode_for_size (GET_MODE_BITSIZE (to_mode), MODE_INT);
473 gcc_assert (convert_optab_handler (trunc_optab, to_mode, full_mode)->insn_code
474 != CODE_FOR_nothing);
476 if (full_mode != from_mode)
477 from = convert_to_mode (full_mode, from, unsignedp);
478 emit_unop_insn (convert_optab_handler (trunc_optab, to_mode, full_mode)->insn_code,
482 if (GET_MODE_CLASS (from_mode) == MODE_PARTIAL_INT)
485 enum machine_mode full_mode
486 = smallest_mode_for_size (GET_MODE_BITSIZE (from_mode), MODE_INT);
488 gcc_assert (convert_optab_handler (sext_optab, full_mode, from_mode)->insn_code
489 != CODE_FOR_nothing);
491 if (to_mode == full_mode)
493 emit_unop_insn (convert_optab_handler (sext_optab, full_mode, from_mode)->insn_code,
498 new_from = gen_reg_rtx (full_mode);
499 emit_unop_insn (convert_optab_handler (sext_optab, full_mode, from_mode)->insn_code,
500 new_from, from, UNKNOWN);
502 /* else proceed to integer conversions below. */
503 from_mode = full_mode;
507 /* Make sure both are fixed-point modes or both are not. */
508 gcc_assert (ALL_SCALAR_FIXED_POINT_MODE_P (from_mode) ==
509 ALL_SCALAR_FIXED_POINT_MODE_P (to_mode));
510 if (ALL_SCALAR_FIXED_POINT_MODE_P (from_mode))
512 /* If we widen from_mode to to_mode and they are in the same class,
513 we won't saturate the result.
514 Otherwise, always saturate the result to play safe. */
515 if (GET_MODE_CLASS (from_mode) == GET_MODE_CLASS (to_mode)
516 && GET_MODE_SIZE (from_mode) < GET_MODE_SIZE (to_mode))
517 expand_fixed_convert (to, from, 0, 0);
519 expand_fixed_convert (to, from, 0, 1);
523 /* Now both modes are integers. */
525 /* Handle expanding beyond a word. */
526 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode)
527 && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD)
534 enum machine_mode lowpart_mode;
535 int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD);
537 /* Try converting directly if the insn is supported. */
538 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
541 /* If FROM is a SUBREG, put it into a register. Do this
542 so that we always generate the same set of insns for
543 better cse'ing; if an intermediate assignment occurred,
544 we won't be doing the operation directly on the SUBREG. */
545 if (optimize > 0 && GET_CODE (from) == SUBREG)
546 from = force_reg (from_mode, from);
547 emit_unop_insn (code, to, from, equiv_code);
550 /* Next, try converting via full word. */
551 else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD
552 && ((code = can_extend_p (to_mode, word_mode, unsignedp))
553 != CODE_FOR_nothing))
555 rtx word_to = gen_reg_rtx (word_mode);
558 if (reg_overlap_mentioned_p (to, from))
559 from = force_reg (from_mode, from);
562 convert_move (word_to, from, unsignedp);
563 emit_unop_insn (code, to, word_to, equiv_code);
567 /* No special multiword conversion insn; do it by hand. */
570 /* Since we will turn this into a no conflict block, we must ensure
571 that the source does not overlap the target. */
573 if (reg_overlap_mentioned_p (to, from))
574 from = force_reg (from_mode, from);
576 /* Get a copy of FROM widened to a word, if necessary. */
577 if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
578 lowpart_mode = word_mode;
580 lowpart_mode = from_mode;
582 lowfrom = convert_to_mode (lowpart_mode, from, unsignedp);
584 lowpart = gen_lowpart (lowpart_mode, to);
585 emit_move_insn (lowpart, lowfrom);
587 /* Compute the value to put in each remaining word. */
589 fill_value = const0_rtx;
591 fill_value = emit_store_flag (gen_reg_rtx (word_mode),
592 LT, lowfrom, const0_rtx,
595 /* Fill the remaining words. */
596 for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
598 int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
599 rtx subword = operand_subword (to, index, 1, to_mode);
601 gcc_assert (subword);
603 if (fill_value != subword)
604 emit_move_insn (subword, fill_value);
607 insns = get_insns ();
614 /* Truncating multi-word to a word or less. */
615 if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
616 && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
619 && ! MEM_VOLATILE_P (from)
620 && direct_load[(int) to_mode]
621 && ! mode_dependent_address_p (XEXP (from, 0)))
623 || GET_CODE (from) == SUBREG))
624 from = force_reg (from_mode, from);
625 convert_move (to, gen_lowpart (word_mode, from), 0);
629 /* Now follow all the conversions between integers
630 no more than a word long. */
632 /* For truncation, usually we can just refer to FROM in a narrower mode. */
633 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
634 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
635 GET_MODE_BITSIZE (from_mode)))
638 && ! MEM_VOLATILE_P (from)
639 && direct_load[(int) to_mode]
640 && ! mode_dependent_address_p (XEXP (from, 0)))
642 || GET_CODE (from) == SUBREG))
643 from = force_reg (from_mode, from);
644 if (REG_P (from) && REGNO (from) < FIRST_PSEUDO_REGISTER
645 && ! HARD_REGNO_MODE_OK (REGNO (from), to_mode))
646 from = copy_to_reg (from);
647 emit_move_insn (to, gen_lowpart (to_mode, from));
651 /* Handle extension. */
652 if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
654 /* Convert directly if that works. */
655 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
658 emit_unop_insn (code, to, from, equiv_code);
663 enum machine_mode intermediate;
667 /* Search for a mode to convert via. */
668 for (intermediate = from_mode; intermediate != VOIDmode;
669 intermediate = GET_MODE_WIDER_MODE (intermediate))
670 if (((can_extend_p (to_mode, intermediate, unsignedp)
672 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
673 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
674 GET_MODE_BITSIZE (intermediate))))
675 && (can_extend_p (intermediate, from_mode, unsignedp)
676 != CODE_FOR_nothing))
678 convert_move (to, convert_to_mode (intermediate, from,
679 unsignedp), unsignedp);
683 /* No suitable intermediate mode.
684 Generate what we need with shifts. */
685 shift_amount = build_int_cst (NULL_TREE,
686 GET_MODE_BITSIZE (to_mode)
687 - GET_MODE_BITSIZE (from_mode));
688 from = gen_lowpart (to_mode, force_reg (from_mode, from));
689 tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount,
691 tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount,
694 emit_move_insn (to, tmp);
699 /* Support special truncate insns for certain modes. */
700 if (convert_optab_handler (trunc_optab, to_mode, from_mode)->insn_code != CODE_FOR_nothing)
702 emit_unop_insn (convert_optab_handler (trunc_optab, to_mode, from_mode)->insn_code,
707 /* Handle truncation of volatile memrefs, and so on;
708 the things that couldn't be truncated directly,
709 and for which there was no special instruction.
711 ??? Code above formerly short-circuited this, for most integer
712 mode pairs, with a force_reg in from_mode followed by a recursive
713 call to this routine. Appears always to have been wrong. */
714 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
716 rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
717 emit_move_insn (to, temp);
721 /* Mode combination is not recognized. */
725 /* Return an rtx for a value that would result
726 from converting X to mode MODE.
727 Both X and MODE may be floating, or both integer.
728 UNSIGNEDP is nonzero if X is an unsigned value.
729 This can be done by referring to a part of X in place
730 or by copying to a new temporary with conversion. */
733 convert_to_mode (enum machine_mode mode, rtx x, int unsignedp)
735 return convert_modes (mode, VOIDmode, x, unsignedp);
738 /* Return an rtx for a value that would result
739 from converting X from mode OLDMODE to mode MODE.
740 Both modes may be floating, or both integer.
741 UNSIGNEDP is nonzero if X is an unsigned value.
743 This can be done by referring to a part of X in place
744 or by copying to a new temporary with conversion.
746 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode. */
749 convert_modes (enum machine_mode mode, enum machine_mode oldmode, rtx x, int unsignedp)
753 /* If FROM is a SUBREG that indicates that we have already done at least
754 the required extension, strip it. */
756 if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x)
757 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode)
758 && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp)
759 x = gen_lowpart (mode, x);
761 if (GET_MODE (x) != VOIDmode)
762 oldmode = GET_MODE (x);
767 /* There is one case that we must handle specially: If we are converting
768 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
769 we are to interpret the constant as unsigned, gen_lowpart will do
770 the wrong if the constant appears negative. What we want to do is
771 make the high-order word of the constant zero, not all ones. */
773 if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
774 && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
775 && CONST_INT_P (x) && INTVAL (x) < 0)
777 HOST_WIDE_INT val = INTVAL (x);
779 if (oldmode != VOIDmode
780 && HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
782 int width = GET_MODE_BITSIZE (oldmode);
784 /* We need to zero extend VAL. */
785 val &= ((HOST_WIDE_INT) 1 << width) - 1;
788 return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
791 /* We can do this with a gen_lowpart if both desired and current modes
792 are integer, and this is either a constant integer, a register, or a
793 non-volatile MEM. Except for the constant case where MODE is no
794 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
797 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
798 || (GET_MODE_CLASS (mode) == MODE_INT
799 && GET_MODE_CLASS (oldmode) == MODE_INT
800 && (GET_CODE (x) == CONST_DOUBLE
801 || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
802 && ((MEM_P (x) && ! MEM_VOLATILE_P (x)
803 && direct_load[(int) mode])
805 && (! HARD_REGISTER_P (x)
806 || HARD_REGNO_MODE_OK (REGNO (x), mode))
807 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
808 GET_MODE_BITSIZE (GET_MODE (x)))))))))
810 /* ?? If we don't know OLDMODE, we have to assume here that
811 X does not need sign- or zero-extension. This may not be
812 the case, but it's the best we can do. */
813 if (CONST_INT_P (x) && oldmode != VOIDmode
814 && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode))
816 HOST_WIDE_INT val = INTVAL (x);
817 int width = GET_MODE_BITSIZE (oldmode);
819 /* We must sign or zero-extend in this case. Start by
820 zero-extending, then sign extend if we need to. */
821 val &= ((HOST_WIDE_INT) 1 << width) - 1;
823 && (val & ((HOST_WIDE_INT) 1 << (width - 1))))
824 val |= (HOST_WIDE_INT) (-1) << width;
826 return gen_int_mode (val, mode);
829 return gen_lowpart (mode, x);
832 /* Converting from integer constant into mode is always equivalent to an
834 if (VECTOR_MODE_P (mode) && GET_MODE (x) == VOIDmode)
836 gcc_assert (GET_MODE_BITSIZE (mode) == GET_MODE_BITSIZE (oldmode));
837 return simplify_gen_subreg (mode, x, oldmode, 0);
840 temp = gen_reg_rtx (mode);
841 convert_move (temp, x, unsignedp);
845 /* STORE_MAX_PIECES is the number of bytes at a time that we can
846 store efficiently. Due to internal GCC limitations, this is
847 MOVE_MAX_PIECES limited by the number of bytes GCC can represent
848 for an immediate constant. */
850 #define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
852 /* Determine whether the LEN bytes can be moved by using several move
853 instructions. Return nonzero if a call to move_by_pieces should
857 can_move_by_pieces (unsigned HOST_WIDE_INT len,
858 unsigned int align ATTRIBUTE_UNUSED)
860 return MOVE_BY_PIECES_P (len, align);
863 /* Generate several move instructions to copy LEN bytes from block FROM to
864 block TO. (These are MEM rtx's with BLKmode).
866 If PUSH_ROUNDING is defined and TO is NULL, emit_single_push_insn is
867 used to push FROM to the stack.
869 ALIGN is maximum stack alignment we can assume.
871 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
872 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
876 move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
877 unsigned int align, int endp)
879 struct move_by_pieces_d data;
880 enum machine_mode to_addr_mode, from_addr_mode
881 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (from));
882 rtx to_addr, from_addr = XEXP (from, 0);
883 unsigned int max_size = MOVE_MAX_PIECES + 1;
884 enum machine_mode mode = VOIDmode, tmode;
885 enum insn_code icode;
887 align = MIN (to ? MEM_ALIGN (to) : align, MEM_ALIGN (from));
890 data.from_addr = from_addr;
893 to_addr_mode = targetm.addr_space.address_mode (MEM_ADDR_SPACE (to));
894 to_addr = XEXP (to, 0);
897 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
898 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
900 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
904 to_addr_mode = VOIDmode;
908 #ifdef STACK_GROWS_DOWNWARD
914 data.to_addr = to_addr;
917 = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
918 || GET_CODE (from_addr) == POST_INC
919 || GET_CODE (from_addr) == POST_DEC);
921 data.explicit_inc_from = 0;
922 data.explicit_inc_to = 0;
923 if (data.reverse) data.offset = len;
926 /* If copying requires more than two move insns,
927 copy addresses to registers (to make displacements shorter)
928 and use post-increment if available. */
929 if (!(data.autinc_from && data.autinc_to)
930 && move_by_pieces_ninsns (len, align, max_size) > 2)
932 /* Find the mode of the largest move... */
933 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
934 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
935 if (GET_MODE_SIZE (tmode) < max_size)
938 if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
940 data.from_addr = copy_to_mode_reg (from_addr_mode,
941 plus_constant (from_addr, len));
942 data.autinc_from = 1;
943 data.explicit_inc_from = -1;
945 if (USE_LOAD_POST_INCREMENT (mode) && ! data.autinc_from)
947 data.from_addr = copy_to_mode_reg (from_addr_mode, from_addr);
948 data.autinc_from = 1;
949 data.explicit_inc_from = 1;
951 if (!data.autinc_from && CONSTANT_P (from_addr))
952 data.from_addr = copy_to_mode_reg (from_addr_mode, from_addr);
953 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
955 data.to_addr = copy_to_mode_reg (to_addr_mode,
956 plus_constant (to_addr, len));
958 data.explicit_inc_to = -1;
960 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
962 data.to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
964 data.explicit_inc_to = 1;
966 if (!data.autinc_to && CONSTANT_P (to_addr))
967 data.to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
970 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
971 if (align >= GET_MODE_ALIGNMENT (tmode))
972 align = GET_MODE_ALIGNMENT (tmode);
975 enum machine_mode xmode;
977 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
979 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
980 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
981 || SLOW_UNALIGNED_ACCESS (tmode, align))
984 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
987 /* First move what we can in the largest integer mode, then go to
988 successively smaller modes. */
992 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
993 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
994 if (GET_MODE_SIZE (tmode) < max_size)
997 if (mode == VOIDmode)
1000 icode = optab_handler (mov_optab, mode)->insn_code;
1001 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1002 move_by_pieces_1 (GEN_FCN (icode), mode, &data);
1004 max_size = GET_MODE_SIZE (mode);
1007 /* The code above should have handled everything. */
1008 gcc_assert (!data.len);
1014 gcc_assert (!data.reverse);
1019 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
1020 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
1022 data.to_addr = copy_to_mode_reg (to_addr_mode,
1023 plus_constant (data.to_addr,
1026 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
1033 to1 = adjust_address (data.to, QImode, data.offset);
1041 /* Return number of insns required to move L bytes by pieces.
1042 ALIGN (in bits) is maximum alignment we can assume. */
1044 static unsigned HOST_WIDE_INT
1045 move_by_pieces_ninsns (unsigned HOST_WIDE_INT l, unsigned int align,
1046 unsigned int max_size)
1048 unsigned HOST_WIDE_INT n_insns = 0;
1049 enum machine_mode tmode;
1051 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
1052 if (align >= GET_MODE_ALIGNMENT (tmode))
1053 align = GET_MODE_ALIGNMENT (tmode);
1056 enum machine_mode tmode, xmode;
1058 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
1060 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
1061 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
1062 || SLOW_UNALIGNED_ACCESS (tmode, align))
1065 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
1068 while (max_size > 1)
1070 enum machine_mode mode = VOIDmode;
1071 enum insn_code icode;
1073 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1074 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1075 if (GET_MODE_SIZE (tmode) < max_size)
1078 if (mode == VOIDmode)
1081 icode = optab_handler (mov_optab, mode)->insn_code;
1082 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1083 n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);
1085 max_size = GET_MODE_SIZE (mode);
1092 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1093 with move instructions for mode MODE. GENFUN is the gen_... function
1094 to make a move insn for that mode. DATA has all the other info. */
1097 move_by_pieces_1 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
1098 struct move_by_pieces_d *data)
1100 unsigned int size = GET_MODE_SIZE (mode);
1101 rtx to1 = NULL_RTX, from1;
1103 while (data->len >= size)
1106 data->offset -= size;
1110 if (data->autinc_to)
1111 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
1114 to1 = adjust_address (data->to, mode, data->offset);
1117 if (data->autinc_from)
1118 from1 = adjust_automodify_address (data->from, mode, data->from_addr,
1121 from1 = adjust_address (data->from, mode, data->offset);
1123 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
1124 emit_insn (gen_add2_insn (data->to_addr,
1125 GEN_INT (-(HOST_WIDE_INT)size)));
1126 if (HAVE_PRE_DECREMENT && data->explicit_inc_from < 0)
1127 emit_insn (gen_add2_insn (data->from_addr,
1128 GEN_INT (-(HOST_WIDE_INT)size)));
1131 emit_insn ((*genfun) (to1, from1));
1134 #ifdef PUSH_ROUNDING
1135 emit_single_push_insn (mode, from1, NULL);
1141 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
1142 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
1143 if (HAVE_POST_INCREMENT && data->explicit_inc_from > 0)
1144 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
1146 if (! data->reverse)
1147 data->offset += size;
1153 /* Emit code to move a block Y to a block X. This may be done with
1154 string-move instructions, with multiple scalar move instructions,
1155 or with a library call.
1157 Both X and Y must be MEM rtx's (perhaps inside VOLATILE) with mode BLKmode.
1158 SIZE is an rtx that says how long they are.
1159 ALIGN is the maximum alignment we can assume they have.
1160 METHOD describes what kind of copy this is, and what mechanisms may be used.
1162 Return the address of the new block, if memcpy is called and returns it,
1166 emit_block_move_hints (rtx x, rtx y, rtx size, enum block_op_methods method,
1167 unsigned int expected_align, HOST_WIDE_INT expected_size)
1175 case BLOCK_OP_NORMAL:
1176 case BLOCK_OP_TAILCALL:
1177 may_use_call = true;
1180 case BLOCK_OP_CALL_PARM:
1181 may_use_call = block_move_libcall_safe_for_call_parm ();
1183 /* Make inhibit_defer_pop nonzero around the library call
1184 to force it to pop the arguments right away. */
1188 case BLOCK_OP_NO_LIBCALL:
1189 may_use_call = false;
1196 align = MIN (MEM_ALIGN (x), MEM_ALIGN (y));
1197 gcc_assert (align >= BITS_PER_UNIT);
1199 gcc_assert (MEM_P (x));
1200 gcc_assert (MEM_P (y));
1203 /* Make sure we've got BLKmode addresses; store_one_arg can decide that
1204 block copy is more efficient for other large modes, e.g. DCmode. */
1205 x = adjust_address (x, BLKmode, 0);
1206 y = adjust_address (y, BLKmode, 0);
1208 /* Set MEM_SIZE as appropriate for this block copy. The main place this
1209 can be incorrect is coming from __builtin_memcpy. */
1210 if (CONST_INT_P (size))
1212 if (INTVAL (size) == 0)
1215 x = shallow_copy_rtx (x);
1216 y = shallow_copy_rtx (y);
1217 set_mem_size (x, size);
1218 set_mem_size (y, size);
1221 if (CONST_INT_P (size) && MOVE_BY_PIECES_P (INTVAL (size), align))
1222 move_by_pieces (x, y, INTVAL (size), align, 0);
1223 else if (emit_block_move_via_movmem (x, y, size, align,
1224 expected_align, expected_size))
1226 else if (may_use_call
1227 && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (x))
1228 && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (y)))
1229 retval = emit_block_move_via_libcall (x, y, size,
1230 method == BLOCK_OP_TAILCALL);
1232 emit_block_move_via_loop (x, y, size, align);
1234 if (method == BLOCK_OP_CALL_PARM)
1241 emit_block_move (rtx x, rtx y, rtx size, enum block_op_methods method)
1243 return emit_block_move_hints (x, y, size, method, 0, -1);
1246 /* A subroutine of emit_block_move. Returns true if calling the
1247 block move libcall will not clobber any parameters which may have
1248 already been placed on the stack. */
1251 block_move_libcall_safe_for_call_parm (void)
1253 #if defined (REG_PARM_STACK_SPACE)
1257 /* If arguments are pushed on the stack, then they're safe. */
1261 /* If registers go on the stack anyway, any argument is sure to clobber
1262 an outgoing argument. */
1263 #if defined (REG_PARM_STACK_SPACE)
1264 fn = emit_block_move_libcall_fn (false);
1265 /* Avoid set but not used warning if *REG_PARM_STACK_SPACE doesn't
1266 depend on its argument. */
1268 if (OUTGOING_REG_PARM_STACK_SPACE ((!fn ? NULL_TREE : TREE_TYPE (fn)))
1269 && REG_PARM_STACK_SPACE (fn) != 0)
1273 /* If any argument goes in memory, then it might clobber an outgoing
1276 CUMULATIVE_ARGS args_so_far;
1279 fn = emit_block_move_libcall_fn (false);
1280 INIT_CUMULATIVE_ARGS (args_so_far, TREE_TYPE (fn), NULL_RTX, 0, 3);
1282 arg = TYPE_ARG_TYPES (TREE_TYPE (fn));
1283 for ( ; arg != void_list_node ; arg = TREE_CHAIN (arg))
1285 enum machine_mode mode = TYPE_MODE (TREE_VALUE (arg));
1286 rtx tmp = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
1287 if (!tmp || !REG_P (tmp))
1289 if (targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL, 1))
1291 FUNCTION_ARG_ADVANCE (args_so_far, mode, NULL_TREE, 1);
1297 /* A subroutine of emit_block_move. Expand a movmem pattern;
1298 return true if successful. */
1301 emit_block_move_via_movmem (rtx x, rtx y, rtx size, unsigned int align,
1302 unsigned int expected_align, HOST_WIDE_INT expected_size)
1304 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
1305 int save_volatile_ok = volatile_ok;
1306 enum machine_mode mode;
1308 if (expected_align < align)
1309 expected_align = align;
1311 /* Since this is a move insn, we don't care about volatility. */
1314 /* Try the most limited insn first, because there's no point
1315 including more than one in the machine description unless
1316 the more limited one has some advantage. */
1318 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
1319 mode = GET_MODE_WIDER_MODE (mode))
1321 enum insn_code code = movmem_optab[(int) mode];
1322 insn_operand_predicate_fn pred;
1324 if (code != CODE_FOR_nothing
1325 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1326 here because if SIZE is less than the mode mask, as it is
1327 returned by the macro, it will definitely be less than the
1328 actual mode mask. */
1329 && ((CONST_INT_P (size)
1330 && ((unsigned HOST_WIDE_INT) INTVAL (size)
1331 <= (GET_MODE_MASK (mode) >> 1)))
1332 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
1333 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
1334 || (*pred) (x, BLKmode))
1335 && ((pred = insn_data[(int) code].operand[1].predicate) == 0
1336 || (*pred) (y, BLKmode))
1337 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
1338 || (*pred) (opalign, VOIDmode)))
1341 rtx last = get_last_insn ();
1344 op2 = convert_to_mode (mode, size, 1);
1345 pred = insn_data[(int) code].operand[2].predicate;
1346 if (pred != 0 && ! (*pred) (op2, mode))
1347 op2 = copy_to_mode_reg (mode, op2);
1349 /* ??? When called via emit_block_move_for_call, it'd be
1350 nice if there were some way to inform the backend, so
1351 that it doesn't fail the expansion because it thinks
1352 emitting the libcall would be more efficient. */
1354 if (insn_data[(int) code].n_operands == 4)
1355 pat = GEN_FCN ((int) code) (x, y, op2, opalign);
1357 pat = GEN_FCN ((int) code) (x, y, op2, opalign,
1358 GEN_INT (expected_align
1360 GEN_INT (expected_size));
1364 volatile_ok = save_volatile_ok;
1368 delete_insns_since (last);
1372 volatile_ok = save_volatile_ok;
1376 /* A subroutine of emit_block_move. Expand a call to memcpy.
1377 Return the return value from memcpy, 0 otherwise. */
1380 emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall)
1382 rtx dst_addr, src_addr;
1383 tree call_expr, fn, src_tree, dst_tree, size_tree;
1384 enum machine_mode size_mode;
1387 /* Emit code to copy the addresses of DST and SRC and SIZE into new
1388 pseudos. We can then place those new pseudos into a VAR_DECL and
1391 dst_addr = copy_to_mode_reg (Pmode, XEXP (dst, 0));
1392 src_addr = copy_to_mode_reg (Pmode, XEXP (src, 0));
1394 dst_addr = convert_memory_address (ptr_mode, dst_addr);
1395 src_addr = convert_memory_address (ptr_mode, src_addr);
1397 dst_tree = make_tree (ptr_type_node, dst_addr);
1398 src_tree = make_tree (ptr_type_node, src_addr);
1400 size_mode = TYPE_MODE (sizetype);
1402 size = convert_to_mode (size_mode, size, 1);
1403 size = copy_to_mode_reg (size_mode, size);
1405 /* It is incorrect to use the libcall calling conventions to call
1406 memcpy in this context. This could be a user call to memcpy and
1407 the user may wish to examine the return value from memcpy. For
1408 targets where libcalls and normal calls have different conventions
1409 for returning pointers, we could end up generating incorrect code. */
1411 size_tree = make_tree (sizetype, size);
1413 fn = emit_block_move_libcall_fn (true);
1414 call_expr = build_call_expr (fn, 3, dst_tree, src_tree, size_tree);
1415 CALL_EXPR_TAILCALL (call_expr) = tailcall;
1417 retval = expand_normal (call_expr);
1422 /* A subroutine of emit_block_move_via_libcall. Create the tree node
1423 for the function we use for block copies. The first time FOR_CALL
1424 is true, we call assemble_external. */
1426 static GTY(()) tree block_move_fn;
1429 init_block_move_fn (const char *asmspec)
1435 fn = get_identifier ("memcpy");
1436 args = build_function_type_list (ptr_type_node, ptr_type_node,
1437 const_ptr_type_node, sizetype,
1440 fn = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL, fn, args);
1441 DECL_EXTERNAL (fn) = 1;
1442 TREE_PUBLIC (fn) = 1;
1443 DECL_ARTIFICIAL (fn) = 1;
1444 TREE_NOTHROW (fn) = 1;
1445 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
1446 DECL_VISIBILITY_SPECIFIED (fn) = 1;
1452 set_user_assembler_name (block_move_fn, asmspec);
1456 emit_block_move_libcall_fn (int for_call)
1458 static bool emitted_extern;
1461 init_block_move_fn (NULL);
1463 if (for_call && !emitted_extern)
1465 emitted_extern = true;
1466 make_decl_rtl (block_move_fn);
1467 assemble_external (block_move_fn);
1470 return block_move_fn;
1473 /* A subroutine of emit_block_move. Copy the data via an explicit
1474 loop. This is used only when libcalls are forbidden. */
1475 /* ??? It'd be nice to copy in hunks larger than QImode. */
1478 emit_block_move_via_loop (rtx x, rtx y, rtx size,
1479 unsigned int align ATTRIBUTE_UNUSED)
1481 rtx cmp_label, top_label, iter, x_addr, y_addr, tmp;
1482 enum machine_mode x_addr_mode
1483 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (x));
1484 enum machine_mode y_addr_mode
1485 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (y));
1486 enum machine_mode iter_mode;
1488 iter_mode = GET_MODE (size);
1489 if (iter_mode == VOIDmode)
1490 iter_mode = word_mode;
1492 top_label = gen_label_rtx ();
1493 cmp_label = gen_label_rtx ();
1494 iter = gen_reg_rtx (iter_mode);
1496 emit_move_insn (iter, const0_rtx);
1498 x_addr = force_operand (XEXP (x, 0), NULL_RTX);
1499 y_addr = force_operand (XEXP (y, 0), NULL_RTX);
1500 do_pending_stack_adjust ();
1502 emit_jump (cmp_label);
1503 emit_label (top_label);
1505 tmp = convert_modes (x_addr_mode, iter_mode, iter, true);
1506 x_addr = gen_rtx_PLUS (x_addr_mode, x_addr, tmp);
1508 if (x_addr_mode != y_addr_mode)
1509 tmp = convert_modes (y_addr_mode, iter_mode, iter, true);
1510 y_addr = gen_rtx_PLUS (y_addr_mode, y_addr, tmp);
1512 x = change_address (x, QImode, x_addr);
1513 y = change_address (y, QImode, y_addr);
1515 emit_move_insn (x, y);
1517 tmp = expand_simple_binop (iter_mode, PLUS, iter, const1_rtx, iter,
1518 true, OPTAB_LIB_WIDEN);
1520 emit_move_insn (iter, tmp);
1522 emit_label (cmp_label);
1524 emit_cmp_and_jump_insns (iter, size, LT, NULL_RTX, iter_mode,
1528 /* Copy all or part of a value X into registers starting at REGNO.
1529 The number of registers to be filled is NREGS. */
1532 move_block_to_reg (int regno, rtx x, int nregs, enum machine_mode mode)
1535 #ifdef HAVE_load_multiple
1543 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
1544 x = validize_mem (force_const_mem (mode, x));
1546 /* See if the machine can do this with a load multiple insn. */
1547 #ifdef HAVE_load_multiple
1548 if (HAVE_load_multiple)
1550 last = get_last_insn ();
1551 pat = gen_load_multiple (gen_rtx_REG (word_mode, regno), x,
1559 delete_insns_since (last);
1563 for (i = 0; i < nregs; i++)
1564 emit_move_insn (gen_rtx_REG (word_mode, regno + i),
1565 operand_subword_force (x, i, mode));
1568 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1569 The number of registers to be filled is NREGS. */
1572 move_block_from_reg (int regno, rtx x, int nregs)
1579 /* See if the machine can do this with a store multiple insn. */
1580 #ifdef HAVE_store_multiple
1581 if (HAVE_store_multiple)
1583 rtx last = get_last_insn ();
1584 rtx pat = gen_store_multiple (x, gen_rtx_REG (word_mode, regno),
1592 delete_insns_since (last);
1596 for (i = 0; i < nregs; i++)
1598 rtx tem = operand_subword (x, i, 1, BLKmode);
1602 emit_move_insn (tem, gen_rtx_REG (word_mode, regno + i));
1606 /* Generate a PARALLEL rtx for a new non-consecutive group of registers from
1607 ORIG, where ORIG is a non-consecutive group of registers represented by
1608 a PARALLEL. The clone is identical to the original except in that the
1609 original set of registers is replaced by a new set of pseudo registers.
1610 The new set has the same modes as the original set. */
1613 gen_group_rtx (rtx orig)
1618 gcc_assert (GET_CODE (orig) == PARALLEL);
1620 length = XVECLEN (orig, 0);
1621 tmps = XALLOCAVEC (rtx, length);
1623 /* Skip a NULL entry in first slot. */
1624 i = XEXP (XVECEXP (orig, 0, 0), 0) ? 0 : 1;
1629 for (; i < length; i++)
1631 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (orig, 0, i), 0));
1632 rtx offset = XEXP (XVECEXP (orig, 0, i), 1);
1634 tmps[i] = gen_rtx_EXPR_LIST (VOIDmode, gen_reg_rtx (mode), offset);
1637 return gen_rtx_PARALLEL (GET_MODE (orig), gen_rtvec_v (length, tmps));
1640 /* A subroutine of emit_group_load. Arguments as for emit_group_load,
1641 except that values are placed in TMPS[i], and must later be moved
1642 into corresponding XEXP (XVECEXP (DST, 0, i), 0) element. */
1645 emit_group_load_1 (rtx *tmps, rtx dst, rtx orig_src, tree type, int ssize)
1649 enum machine_mode m = GET_MODE (orig_src);
1651 gcc_assert (GET_CODE (dst) == PARALLEL);
1654 && !SCALAR_INT_MODE_P (m)
1655 && !MEM_P (orig_src)
1656 && GET_CODE (orig_src) != CONCAT)
1658 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_src));
1659 if (imode == BLKmode)
1660 src = assign_stack_temp (GET_MODE (orig_src), ssize, 0);
1662 src = gen_reg_rtx (imode);
1663 if (imode != BLKmode)
1664 src = gen_lowpart (GET_MODE (orig_src), src);
1665 emit_move_insn (src, orig_src);
1666 /* ...and back again. */
1667 if (imode != BLKmode)
1668 src = gen_lowpart (imode, src);
1669 emit_group_load_1 (tmps, dst, src, type, ssize);
1673 /* Check for a NULL entry, used to indicate that the parameter goes
1674 both on the stack and in registers. */
1675 if (XEXP (XVECEXP (dst, 0, 0), 0))
1680 /* Process the pieces. */
1681 for (i = start; i < XVECLEN (dst, 0); i++)
1683 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (dst, 0, i), 0));
1684 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (dst, 0, i), 1));
1685 unsigned int bytelen = GET_MODE_SIZE (mode);
1688 /* Handle trailing fragments that run over the size of the struct. */
1689 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
1691 /* Arrange to shift the fragment to where it belongs.
1692 extract_bit_field loads to the lsb of the reg. */
1694 #ifdef BLOCK_REG_PADDING
1695 BLOCK_REG_PADDING (GET_MODE (orig_src), type, i == start)
1696 == (BYTES_BIG_ENDIAN ? upward : downward)
1701 shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
1702 bytelen = ssize - bytepos;
1703 gcc_assert (bytelen > 0);
1706 /* If we won't be loading directly from memory, protect the real source
1707 from strange tricks we might play; but make sure that the source can
1708 be loaded directly into the destination. */
1710 if (!MEM_P (orig_src)
1711 && (!CONSTANT_P (orig_src)
1712 || (GET_MODE (orig_src) != mode
1713 && GET_MODE (orig_src) != VOIDmode)))
1715 if (GET_MODE (orig_src) == VOIDmode)
1716 src = gen_reg_rtx (mode);
1718 src = gen_reg_rtx (GET_MODE (orig_src));
1720 emit_move_insn (src, orig_src);
1723 /* Optimize the access just a bit. */
1725 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (src))
1726 || MEM_ALIGN (src) >= GET_MODE_ALIGNMENT (mode))
1727 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
1728 && bytelen == GET_MODE_SIZE (mode))
1730 tmps[i] = gen_reg_rtx (mode);
1731 emit_move_insn (tmps[i], adjust_address (src, mode, bytepos));
1733 else if (COMPLEX_MODE_P (mode)
1734 && GET_MODE (src) == mode
1735 && bytelen == GET_MODE_SIZE (mode))
1736 /* Let emit_move_complex do the bulk of the work. */
1738 else if (GET_CODE (src) == CONCAT)
1740 unsigned int slen = GET_MODE_SIZE (GET_MODE (src));
1741 unsigned int slen0 = GET_MODE_SIZE (GET_MODE (XEXP (src, 0)));
1743 if ((bytepos == 0 && bytelen == slen0)
1744 || (bytepos != 0 && bytepos + bytelen <= slen))
1746 /* The following assumes that the concatenated objects all
1747 have the same size. In this case, a simple calculation
1748 can be used to determine the object and the bit field
1750 tmps[i] = XEXP (src, bytepos / slen0);
1751 if (! CONSTANT_P (tmps[i])
1752 && (!REG_P (tmps[i]) || GET_MODE (tmps[i]) != mode))
1753 tmps[i] = extract_bit_field (tmps[i], bytelen * BITS_PER_UNIT,
1754 (bytepos % slen0) * BITS_PER_UNIT,
1755 1, NULL_RTX, mode, mode);
1761 gcc_assert (!bytepos);
1762 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1763 emit_move_insn (mem, src);
1764 tmps[i] = extract_bit_field (mem, bytelen * BITS_PER_UNIT,
1765 0, 1, NULL_RTX, mode, mode);
1768 /* FIXME: A SIMD parallel will eventually lead to a subreg of a
1769 SIMD register, which is currently broken. While we get GCC
1770 to emit proper RTL for these cases, let's dump to memory. */
1771 else if (VECTOR_MODE_P (GET_MODE (dst))
1774 int slen = GET_MODE_SIZE (GET_MODE (src));
1777 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1778 emit_move_insn (mem, src);
1779 tmps[i] = adjust_address (mem, mode, (int) bytepos);
1781 else if (CONSTANT_P (src) && GET_MODE (dst) != BLKmode
1782 && XVECLEN (dst, 0) > 1)
1783 tmps[i] = simplify_gen_subreg (mode, src, GET_MODE(dst), bytepos);
1784 else if (CONSTANT_P (src))
1786 HOST_WIDE_INT len = (HOST_WIDE_INT) bytelen;
1794 gcc_assert (2 * len == ssize);
1795 split_double (src, &first, &second);
1802 else if (REG_P (src) && GET_MODE (src) == mode)
1805 tmps[i] = extract_bit_field (src, bytelen * BITS_PER_UNIT,
1806 bytepos * BITS_PER_UNIT, 1, NULL_RTX,
1810 tmps[i] = expand_shift (LSHIFT_EXPR, mode, tmps[i],
1811 build_int_cst (NULL_TREE, shift), tmps[i], 0);
1815 /* Emit code to move a block SRC of type TYPE to a block DST,
1816 where DST is non-consecutive registers represented by a PARALLEL.
1817 SSIZE represents the total size of block ORIG_SRC in bytes, or -1
1821 emit_group_load (rtx dst, rtx src, tree type, int ssize)
1826 tmps = XALLOCAVEC (rtx, XVECLEN (dst, 0));
1827 emit_group_load_1 (tmps, dst, src, type, ssize);
1829 /* Copy the extracted pieces into the proper (probable) hard regs. */
1830 for (i = 0; i < XVECLEN (dst, 0); i++)
1832 rtx d = XEXP (XVECEXP (dst, 0, i), 0);
1835 emit_move_insn (d, tmps[i]);
1839 /* Similar, but load SRC into new pseudos in a format that looks like
1840 PARALLEL. This can later be fed to emit_group_move to get things
1841 in the right place. */
1844 emit_group_load_into_temps (rtx parallel, rtx src, tree type, int ssize)
1849 vec = rtvec_alloc (XVECLEN (parallel, 0));
1850 emit_group_load_1 (&RTVEC_ELT (vec, 0), parallel, src, type, ssize);
1852 /* Convert the vector to look just like the original PARALLEL, except
1853 with the computed values. */
1854 for (i = 0; i < XVECLEN (parallel, 0); i++)
1856 rtx e = XVECEXP (parallel, 0, i);
1857 rtx d = XEXP (e, 0);
1861 d = force_reg (GET_MODE (d), RTVEC_ELT (vec, i));
1862 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), d, XEXP (e, 1));
1864 RTVEC_ELT (vec, i) = e;
1867 return gen_rtx_PARALLEL (GET_MODE (parallel), vec);
1870 /* Emit code to move a block SRC to block DST, where SRC and DST are
1871 non-consecutive groups of registers, each represented by a PARALLEL. */
1874 emit_group_move (rtx dst, rtx src)
1878 gcc_assert (GET_CODE (src) == PARALLEL
1879 && GET_CODE (dst) == PARALLEL
1880 && XVECLEN (src, 0) == XVECLEN (dst, 0));
1882 /* Skip first entry if NULL. */
1883 for (i = XEXP (XVECEXP (src, 0, 0), 0) ? 0 : 1; i < XVECLEN (src, 0); i++)
1884 emit_move_insn (XEXP (XVECEXP (dst, 0, i), 0),
1885 XEXP (XVECEXP (src, 0, i), 0));
1888 /* Move a group of registers represented by a PARALLEL into pseudos. */
1891 emit_group_move_into_temps (rtx src)
1893 rtvec vec = rtvec_alloc (XVECLEN (src, 0));
1896 for (i = 0; i < XVECLEN (src, 0); i++)
1898 rtx e = XVECEXP (src, 0, i);
1899 rtx d = XEXP (e, 0);
1902 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), copy_to_reg (d), XEXP (e, 1));
1903 RTVEC_ELT (vec, i) = e;
1906 return gen_rtx_PARALLEL (GET_MODE (src), vec);
1909 /* Emit code to move a block SRC to a block ORIG_DST of type TYPE,
1910 where SRC is non-consecutive registers represented by a PARALLEL.
1911 SSIZE represents the total size of block ORIG_DST, or -1 if not
1915 emit_group_store (rtx orig_dst, rtx src, tree type ATTRIBUTE_UNUSED, int ssize)
1918 int start, finish, i;
1919 enum machine_mode m = GET_MODE (orig_dst);
1921 gcc_assert (GET_CODE (src) == PARALLEL);
1923 if (!SCALAR_INT_MODE_P (m)
1924 && !MEM_P (orig_dst) && GET_CODE (orig_dst) != CONCAT)
1926 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_dst));
1927 if (imode == BLKmode)
1928 dst = assign_stack_temp (GET_MODE (orig_dst), ssize, 0);
1930 dst = gen_reg_rtx (imode);
1931 emit_group_store (dst, src, type, ssize);
1932 if (imode != BLKmode)
1933 dst = gen_lowpart (GET_MODE (orig_dst), dst);
1934 emit_move_insn (orig_dst, dst);
1938 /* Check for a NULL entry, used to indicate that the parameter goes
1939 both on the stack and in registers. */
1940 if (XEXP (XVECEXP (src, 0, 0), 0))
1944 finish = XVECLEN (src, 0);
1946 tmps = XALLOCAVEC (rtx, finish);
1948 /* Copy the (probable) hard regs into pseudos. */
1949 for (i = start; i < finish; i++)
1951 rtx reg = XEXP (XVECEXP (src, 0, i), 0);
1952 if (!REG_P (reg) || REGNO (reg) < FIRST_PSEUDO_REGISTER)
1954 tmps[i] = gen_reg_rtx (GET_MODE (reg));
1955 emit_move_insn (tmps[i], reg);
1961 /* If we won't be storing directly into memory, protect the real destination
1962 from strange tricks we might play. */
1964 if (GET_CODE (dst) == PARALLEL)
1968 /* We can get a PARALLEL dst if there is a conditional expression in
1969 a return statement. In that case, the dst and src are the same,
1970 so no action is necessary. */
1971 if (rtx_equal_p (dst, src))
1974 /* It is unclear if we can ever reach here, but we may as well handle
1975 it. Allocate a temporary, and split this into a store/load to/from
1978 temp = assign_stack_temp (GET_MODE (dst), ssize, 0);
1979 emit_group_store (temp, src, type, ssize);
1980 emit_group_load (dst, temp, type, ssize);
1983 else if (!MEM_P (dst) && GET_CODE (dst) != CONCAT)
1985 enum machine_mode outer = GET_MODE (dst);
1986 enum machine_mode inner;
1987 HOST_WIDE_INT bytepos;
1991 if (!REG_P (dst) || REGNO (dst) < FIRST_PSEUDO_REGISTER)
1992 dst = gen_reg_rtx (outer);
1994 /* Make life a bit easier for combine. */
1995 /* If the first element of the vector is the low part
1996 of the destination mode, use a paradoxical subreg to
1997 initialize the destination. */
2000 inner = GET_MODE (tmps[start]);
2001 bytepos = subreg_lowpart_offset (inner, outer);
2002 if (INTVAL (XEXP (XVECEXP (src, 0, start), 1)) == bytepos)
2004 temp = simplify_gen_subreg (outer, tmps[start],
2008 emit_move_insn (dst, temp);
2015 /* If the first element wasn't the low part, try the last. */
2017 && start < finish - 1)
2019 inner = GET_MODE (tmps[finish - 1]);
2020 bytepos = subreg_lowpart_offset (inner, outer);
2021 if (INTVAL (XEXP (XVECEXP (src, 0, finish - 1), 1)) == bytepos)
2023 temp = simplify_gen_subreg (outer, tmps[finish - 1],
2027 emit_move_insn (dst, temp);
2034 /* Otherwise, simply initialize the result to zero. */
2036 emit_move_insn (dst, CONST0_RTX (outer));
2039 /* Process the pieces. */
2040 for (i = start; i < finish; i++)
2042 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (src, 0, i), 1));
2043 enum machine_mode mode = GET_MODE (tmps[i]);
2044 unsigned int bytelen = GET_MODE_SIZE (mode);
2045 unsigned int adj_bytelen = bytelen;
2048 /* Handle trailing fragments that run over the size of the struct. */
2049 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
2050 adj_bytelen = ssize - bytepos;
2052 if (GET_CODE (dst) == CONCAT)
2054 if (bytepos + adj_bytelen
2055 <= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2056 dest = XEXP (dst, 0);
2057 else if (bytepos >= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2059 bytepos -= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0)));
2060 dest = XEXP (dst, 1);
2064 enum machine_mode dest_mode = GET_MODE (dest);
2065 enum machine_mode tmp_mode = GET_MODE (tmps[i]);
2067 gcc_assert (bytepos == 0 && XVECLEN (src, 0));
2069 if (GET_MODE_ALIGNMENT (dest_mode)
2070 >= GET_MODE_ALIGNMENT (tmp_mode))
2072 dest = assign_stack_temp (dest_mode,
2073 GET_MODE_SIZE (dest_mode),
2075 emit_move_insn (adjust_address (dest,
2083 dest = assign_stack_temp (tmp_mode,
2084 GET_MODE_SIZE (tmp_mode),
2086 emit_move_insn (dest, tmps[i]);
2087 dst = adjust_address (dest, dest_mode, bytepos);
2093 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
2095 /* store_bit_field always takes its value from the lsb.
2096 Move the fragment to the lsb if it's not already there. */
2098 #ifdef BLOCK_REG_PADDING
2099 BLOCK_REG_PADDING (GET_MODE (orig_dst), type, i == start)
2100 == (BYTES_BIG_ENDIAN ? upward : downward)
2106 int shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
2107 tmps[i] = expand_shift (RSHIFT_EXPR, mode, tmps[i],
2108 build_int_cst (NULL_TREE, shift),
2111 bytelen = adj_bytelen;
2114 /* Optimize the access just a bit. */
2116 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (dest))
2117 || MEM_ALIGN (dest) >= GET_MODE_ALIGNMENT (mode))
2118 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
2119 && bytelen == GET_MODE_SIZE (mode))
2120 emit_move_insn (adjust_address (dest, mode, bytepos), tmps[i]);
2122 store_bit_field (dest, bytelen * BITS_PER_UNIT, bytepos * BITS_PER_UNIT,
2126 /* Copy from the pseudo into the (probable) hard reg. */
2127 if (orig_dst != dst)
2128 emit_move_insn (orig_dst, dst);
2131 /* Generate code to copy a BLKmode object of TYPE out of a
2132 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2133 is null, a stack temporary is created. TGTBLK is returned.
2135 The purpose of this routine is to handle functions that return
2136 BLKmode structures in registers. Some machines (the PA for example)
2137 want to return all small structures in registers regardless of the
2138 structure's alignment. */
2141 copy_blkmode_from_reg (rtx tgtblk, rtx srcreg, tree type)
2143 unsigned HOST_WIDE_INT bytes = int_size_in_bytes (type);
2144 rtx src = NULL, dst = NULL;
2145 unsigned HOST_WIDE_INT bitsize = MIN (TYPE_ALIGN (type), BITS_PER_WORD);
2146 unsigned HOST_WIDE_INT bitpos, xbitpos, padding_correction = 0;
2147 enum machine_mode copy_mode;
2151 tgtblk = assign_temp (build_qualified_type (type,
2153 | TYPE_QUAL_CONST)),
2155 preserve_temp_slots (tgtblk);
2158 /* This code assumes srcreg is at least a full word. If it isn't, copy it
2159 into a new pseudo which is a full word. */
2161 if (GET_MODE (srcreg) != BLKmode
2162 && GET_MODE_SIZE (GET_MODE (srcreg)) < UNITS_PER_WORD)
2163 srcreg = convert_to_mode (word_mode, srcreg, TYPE_UNSIGNED (type));
2165 /* If the structure doesn't take up a whole number of words, see whether
2166 SRCREG is padded on the left or on the right. If it's on the left,
2167 set PADDING_CORRECTION to the number of bits to skip.
2169 In most ABIs, the structure will be returned at the least end of
2170 the register, which translates to right padding on little-endian
2171 targets and left padding on big-endian targets. The opposite
2172 holds if the structure is returned at the most significant
2173 end of the register. */
2174 if (bytes % UNITS_PER_WORD != 0
2175 && (targetm.calls.return_in_msb (type)
2177 : BYTES_BIG_ENDIAN))
2179 = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) * BITS_PER_UNIT));
2181 /* Copy the structure BITSIZE bits at a time. If the target lives in
2182 memory, take care of not reading/writing past its end by selecting
2183 a copy mode suited to BITSIZE. This should always be possible given
2186 We could probably emit more efficient code for machines which do not use
2187 strict alignment, but it doesn't seem worth the effort at the current
2190 copy_mode = word_mode;
2193 enum machine_mode mem_mode = mode_for_size (bitsize, MODE_INT, 1);
2194 if (mem_mode != BLKmode)
2195 copy_mode = mem_mode;
2198 for (bitpos = 0, xbitpos = padding_correction;
2199 bitpos < bytes * BITS_PER_UNIT;
2200 bitpos += bitsize, xbitpos += bitsize)
2202 /* We need a new source operand each time xbitpos is on a
2203 word boundary and when xbitpos == padding_correction
2204 (the first time through). */
2205 if (xbitpos % BITS_PER_WORD == 0
2206 || xbitpos == padding_correction)
2207 src = operand_subword_force (srcreg, xbitpos / BITS_PER_WORD,
2210 /* We need a new destination operand each time bitpos is on
2212 if (bitpos % BITS_PER_WORD == 0)
2213 dst = operand_subword (tgtblk, bitpos / BITS_PER_WORD, 1, BLKmode);
2215 /* Use xbitpos for the source extraction (right justified) and
2216 bitpos for the destination store (left justified). */
2217 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, copy_mode,
2218 extract_bit_field (src, bitsize,
2219 xbitpos % BITS_PER_WORD, 1,
2220 NULL_RTX, copy_mode, copy_mode));
2226 /* Add a USE expression for REG to the (possibly empty) list pointed
2227 to by CALL_FUSAGE. REG must denote a hard register. */
2230 use_reg (rtx *call_fusage, rtx reg)
2232 gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
2235 = gen_rtx_EXPR_LIST (VOIDmode,
2236 gen_rtx_USE (VOIDmode, reg), *call_fusage);
2239 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2240 starting at REGNO. All of these registers must be hard registers. */
2243 use_regs (rtx *call_fusage, int regno, int nregs)
2247 gcc_assert (regno + nregs <= FIRST_PSEUDO_REGISTER);
2249 for (i = 0; i < nregs; i++)
2250 use_reg (call_fusage, regno_reg_rtx[regno + i]);
2253 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2254 PARALLEL REGS. This is for calls that pass values in multiple
2255 non-contiguous locations. The Irix 6 ABI has examples of this. */
2258 use_group_regs (rtx *call_fusage, rtx regs)
2262 for (i = 0; i < XVECLEN (regs, 0); i++)
2264 rtx reg = XEXP (XVECEXP (regs, 0, i), 0);
2266 /* A NULL entry means the parameter goes both on the stack and in
2267 registers. This can also be a MEM for targets that pass values
2268 partially on the stack and partially in registers. */
2269 if (reg != 0 && REG_P (reg))
2270 use_reg (call_fusage, reg);
2274 /* Return the defining gimple statement for SSA_NAME NAME if it is an
2275 assigment and the code of the expresion on the RHS is CODE. Return
2279 get_def_for_expr (tree name, enum tree_code code)
2283 if (TREE_CODE (name) != SSA_NAME)
2286 def_stmt = get_gimple_for_ssa_name (name);
2288 || gimple_assign_rhs_code (def_stmt) != code)
2295 /* Determine whether the LEN bytes generated by CONSTFUN can be
2296 stored to memory using several move instructions. CONSTFUNDATA is
2297 a pointer which will be passed as argument in every CONSTFUN call.
2298 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2299 a memset operation and false if it's a copy of a constant string.
2300 Return nonzero if a call to store_by_pieces should succeed. */
2303 can_store_by_pieces (unsigned HOST_WIDE_INT len,
2304 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2305 void *constfundata, unsigned int align, bool memsetp)
2307 unsigned HOST_WIDE_INT l;
2308 unsigned int max_size;
2309 HOST_WIDE_INT offset = 0;
2310 enum machine_mode mode, tmode;
2311 enum insn_code icode;
2319 ? SET_BY_PIECES_P (len, align)
2320 : STORE_BY_PIECES_P (len, align)))
2323 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2324 if (align >= GET_MODE_ALIGNMENT (tmode))
2325 align = GET_MODE_ALIGNMENT (tmode);
2328 enum machine_mode xmode;
2330 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2332 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2333 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2334 || SLOW_UNALIGNED_ACCESS (tmode, align))
2337 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2340 /* We would first store what we can in the largest integer mode, then go to
2341 successively smaller modes. */
2344 reverse <= (HAVE_PRE_DECREMENT || HAVE_POST_DECREMENT);
2349 max_size = STORE_MAX_PIECES + 1;
2350 while (max_size > 1)
2352 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2353 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2354 if (GET_MODE_SIZE (tmode) < max_size)
2357 if (mode == VOIDmode)
2360 icode = optab_handler (mov_optab, mode)->insn_code;
2361 if (icode != CODE_FOR_nothing
2362 && align >= GET_MODE_ALIGNMENT (mode))
2364 unsigned int size = GET_MODE_SIZE (mode);
2371 cst = (*constfun) (constfundata, offset, mode);
2372 if (!LEGITIMATE_CONSTANT_P (cst))
2382 max_size = GET_MODE_SIZE (mode);
2385 /* The code above should have handled everything. */
2392 /* Generate several move instructions to store LEN bytes generated by
2393 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
2394 pointer which will be passed as argument in every CONSTFUN call.
2395 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2396 a memset operation and false if it's a copy of a constant string.
2397 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
2398 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
2402 store_by_pieces (rtx to, unsigned HOST_WIDE_INT len,
2403 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2404 void *constfundata, unsigned int align, bool memsetp, int endp)
2406 enum machine_mode to_addr_mode
2407 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (to));
2408 struct store_by_pieces_d data;
2412 gcc_assert (endp != 2);
2417 ? SET_BY_PIECES_P (len, align)
2418 : STORE_BY_PIECES_P (len, align));
2419 data.constfun = constfun;
2420 data.constfundata = constfundata;
2423 store_by_pieces_1 (&data, align);
2428 gcc_assert (!data.reverse);
2433 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
2434 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
2436 data.to_addr = copy_to_mode_reg (to_addr_mode,
2437 plus_constant (data.to_addr,
2440 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
2447 to1 = adjust_address (data.to, QImode, data.offset);
2455 /* Generate several move instructions to clear LEN bytes of block TO. (A MEM
2456 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2459 clear_by_pieces (rtx to, unsigned HOST_WIDE_INT len, unsigned int align)
2461 struct store_by_pieces_d data;
2466 data.constfun = clear_by_pieces_1;
2467 data.constfundata = NULL;
2470 store_by_pieces_1 (&data, align);
2473 /* Callback routine for clear_by_pieces.
2474 Return const0_rtx unconditionally. */
2477 clear_by_pieces_1 (void *data ATTRIBUTE_UNUSED,
2478 HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
2479 enum machine_mode mode ATTRIBUTE_UNUSED)
2484 /* Subroutine of clear_by_pieces and store_by_pieces.
2485 Generate several move instructions to store LEN bytes of block TO. (A MEM
2486 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2489 store_by_pieces_1 (struct store_by_pieces_d *data ATTRIBUTE_UNUSED,
2490 unsigned int align ATTRIBUTE_UNUSED)
2492 enum machine_mode to_addr_mode
2493 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (data->to));
2494 rtx to_addr = XEXP (data->to, 0);
2495 unsigned int max_size = STORE_MAX_PIECES + 1;
2496 enum machine_mode mode = VOIDmode, tmode;
2497 enum insn_code icode;
2500 data->to_addr = to_addr;
2502 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
2503 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
2505 data->explicit_inc_to = 0;
2507 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
2509 data->offset = data->len;
2511 /* If storing requires more than two move insns,
2512 copy addresses to registers (to make displacements shorter)
2513 and use post-increment if available. */
2514 if (!data->autinc_to
2515 && move_by_pieces_ninsns (data->len, align, max_size) > 2)
2517 /* Determine the main mode we'll be using. */
2518 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2519 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2520 if (GET_MODE_SIZE (tmode) < max_size)
2523 if (USE_STORE_PRE_DECREMENT (mode) && data->reverse && ! data->autinc_to)
2525 data->to_addr = copy_to_mode_reg (to_addr_mode,
2526 plus_constant (to_addr, data->len));
2527 data->autinc_to = 1;
2528 data->explicit_inc_to = -1;
2531 if (USE_STORE_POST_INCREMENT (mode) && ! data->reverse
2532 && ! data->autinc_to)
2534 data->to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
2535 data->autinc_to = 1;
2536 data->explicit_inc_to = 1;
2539 if ( !data->autinc_to && CONSTANT_P (to_addr))
2540 data->to_addr = copy_to_mode_reg (to_addr_mode, to_addr);
2543 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2544 if (align >= GET_MODE_ALIGNMENT (tmode))
2545 align = GET_MODE_ALIGNMENT (tmode);
2548 enum machine_mode xmode;
2550 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2552 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2553 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2554 || SLOW_UNALIGNED_ACCESS (tmode, align))
2557 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2560 /* First store what we can in the largest integer mode, then go to
2561 successively smaller modes. */
2563 while (max_size > 1)
2565 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2566 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2567 if (GET_MODE_SIZE (tmode) < max_size)
2570 if (mode == VOIDmode)
2573 icode = optab_handler (mov_optab, mode)->insn_code;
2574 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
2575 store_by_pieces_2 (GEN_FCN (icode), mode, data);
2577 max_size = GET_MODE_SIZE (mode);
2580 /* The code above should have handled everything. */
2581 gcc_assert (!data->len);
2584 /* Subroutine of store_by_pieces_1. Store as many bytes as appropriate
2585 with move instructions for mode MODE. GENFUN is the gen_... function
2586 to make a move insn for that mode. DATA has all the other info. */
2589 store_by_pieces_2 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
2590 struct store_by_pieces_d *data)
2592 unsigned int size = GET_MODE_SIZE (mode);
2595 while (data->len >= size)
2598 data->offset -= size;
2600 if (data->autinc_to)
2601 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
2604 to1 = adjust_address (data->to, mode, data->offset);
2606 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
2607 emit_insn (gen_add2_insn (data->to_addr,
2608 GEN_INT (-(HOST_WIDE_INT) size)));
2610 cst = (*data->constfun) (data->constfundata, data->offset, mode);
2611 emit_insn ((*genfun) (to1, cst));
2613 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
2614 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
2616 if (! data->reverse)
2617 data->offset += size;
2623 /* Write zeros through the storage of OBJECT. If OBJECT has BLKmode, SIZE is
2624 its length in bytes. */
2627 clear_storage_hints (rtx object, rtx size, enum block_op_methods method,
2628 unsigned int expected_align, HOST_WIDE_INT expected_size)
2630 enum machine_mode mode = GET_MODE (object);
2633 gcc_assert (method == BLOCK_OP_NORMAL || method == BLOCK_OP_TAILCALL);
2635 /* If OBJECT is not BLKmode and SIZE is the same size as its mode,
2636 just move a zero. Otherwise, do this a piece at a time. */
2638 && CONST_INT_P (size)
2639 && INTVAL (size) == (HOST_WIDE_INT) GET_MODE_SIZE (mode))
2641 rtx zero = CONST0_RTX (mode);
2644 emit_move_insn (object, zero);
2648 if (COMPLEX_MODE_P (mode))
2650 zero = CONST0_RTX (GET_MODE_INNER (mode));
2653 write_complex_part (object, zero, 0);
2654 write_complex_part (object, zero, 1);
2660 if (size == const0_rtx)
2663 align = MEM_ALIGN (object);
2665 if (CONST_INT_P (size)
2666 && CLEAR_BY_PIECES_P (INTVAL (size), align))
2667 clear_by_pieces (object, INTVAL (size), align);
2668 else if (set_storage_via_setmem (object, size, const0_rtx, align,
2669 expected_align, expected_size))
2671 else if (ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (object)))
2672 return set_storage_via_libcall (object, size, const0_rtx,
2673 method == BLOCK_OP_TAILCALL);
2681 clear_storage (rtx object, rtx size, enum block_op_methods method)
2683 return clear_storage_hints (object, size, method, 0, -1);
2687 /* A subroutine of clear_storage. Expand a call to memset.
2688 Return the return value of memset, 0 otherwise. */
2691 set_storage_via_libcall (rtx object, rtx size, rtx val, bool tailcall)
2693 tree call_expr, fn, object_tree, size_tree, val_tree;
2694 enum machine_mode size_mode;
2697 /* Emit code to copy OBJECT and SIZE into new pseudos. We can then
2698 place those into new pseudos into a VAR_DECL and use them later. */
2700 object = copy_to_mode_reg (Pmode, XEXP (object, 0));
2702 size_mode = TYPE_MODE (sizetype);
2703 size = convert_to_mode (size_mode, size, 1);
2704 size = copy_to_mode_reg (size_mode, size);
2706 /* It is incorrect to use the libcall calling conventions to call
2707 memset in this context. This could be a user call to memset and
2708 the user may wish to examine the return value from memset. For
2709 targets where libcalls and normal calls have different conventions
2710 for returning pointers, we could end up generating incorrect code. */
2712 object_tree = make_tree (ptr_type_node, object);
2713 if (!CONST_INT_P (val))
2714 val = convert_to_mode (TYPE_MODE (integer_type_node), val, 1);
2715 size_tree = make_tree (sizetype, size);
2716 val_tree = make_tree (integer_type_node, val);
2718 fn = clear_storage_libcall_fn (true);
2719 call_expr = build_call_expr (fn, 3, object_tree, val_tree, size_tree);
2720 CALL_EXPR_TAILCALL (call_expr) = tailcall;
2722 retval = expand_normal (call_expr);
2727 /* A subroutine of set_storage_via_libcall. Create the tree node
2728 for the function we use for block clears. The first time FOR_CALL
2729 is true, we call assemble_external. */
2731 tree block_clear_fn;
2734 init_block_clear_fn (const char *asmspec)
2736 if (!block_clear_fn)
2740 fn = get_identifier ("memset");
2741 args = build_function_type_list (ptr_type_node, ptr_type_node,
2742 integer_type_node, sizetype,
2745 fn = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL, fn, args);
2746 DECL_EXTERNAL (fn) = 1;
2747 TREE_PUBLIC (fn) = 1;
2748 DECL_ARTIFICIAL (fn) = 1;
2749 TREE_NOTHROW (fn) = 1;
2750 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
2751 DECL_VISIBILITY_SPECIFIED (fn) = 1;
2753 block_clear_fn = fn;
2757 set_user_assembler_name (block_clear_fn, asmspec);
2761 clear_storage_libcall_fn (int for_call)
2763 static bool emitted_extern;
2765 if (!block_clear_fn)
2766 init_block_clear_fn (NULL);
2768 if (for_call && !emitted_extern)
2770 emitted_extern = true;
2771 make_decl_rtl (block_clear_fn);
2772 assemble_external (block_clear_fn);
2775 return block_clear_fn;
2778 /* Expand a setmem pattern; return true if successful. */
2781 set_storage_via_setmem (rtx object, rtx size, rtx val, unsigned int align,
2782 unsigned int expected_align, HOST_WIDE_INT expected_size)
2784 /* Try the most limited insn first, because there's no point
2785 including more than one in the machine description unless
2786 the more limited one has some advantage. */
2788 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
2789 enum machine_mode mode;
2791 if (expected_align < align)
2792 expected_align = align;
2794 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
2795 mode = GET_MODE_WIDER_MODE (mode))
2797 enum insn_code code = setmem_optab[(int) mode];
2798 insn_operand_predicate_fn pred;
2800 if (code != CODE_FOR_nothing
2801 /* We don't need MODE to be narrower than
2802 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2803 the mode mask, as it is returned by the macro, it will
2804 definitely be less than the actual mode mask. */
2805 && ((CONST_INT_P (size)
2806 && ((unsigned HOST_WIDE_INT) INTVAL (size)
2807 <= (GET_MODE_MASK (mode) >> 1)))
2808 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
2809 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
2810 || (*pred) (object, BLKmode))
2811 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
2812 || (*pred) (opalign, VOIDmode)))
2815 enum machine_mode char_mode;
2816 rtx last = get_last_insn ();
2819 opsize = convert_to_mode (mode, size, 1);
2820 pred = insn_data[(int) code].operand[1].predicate;
2821 if (pred != 0 && ! (*pred) (opsize, mode))
2822 opsize = copy_to_mode_reg (mode, opsize);
2825 char_mode = insn_data[(int) code].operand[2].mode;
2826 if (char_mode != VOIDmode)
2828 opchar = convert_to_mode (char_mode, opchar, 1);
2829 pred = insn_data[(int) code].operand[2].predicate;
2830 if (pred != 0 && ! (*pred) (opchar, char_mode))
2831 opchar = copy_to_mode_reg (char_mode, opchar);
2834 if (insn_data[(int) code].n_operands == 4)
2835 pat = GEN_FCN ((int) code) (object, opsize, opchar, opalign);
2837 pat = GEN_FCN ((int) code) (object, opsize, opchar, opalign,
2838 GEN_INT (expected_align
2840 GEN_INT (expected_size));
2847 delete_insns_since (last);
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, 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, 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)->insn_code;
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))->insn_code != 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)->insn_code;
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)->insn_code;
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 (!LEGITIMATE_CONSTANT_P (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, 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 (LEGITIMATE_CONSTANT_P (y))
3503 oldcost = rtx_cost (y, SET, speed);
3505 oldcost = rtx_cost (force_const_mem (dstmode, y), SET, 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 (LEGITIMATE_CONSTANT_P (trunc_y))
3527 /* Skip if the target needs extra instructions to perform
3529 if (! (*insn_data[ic].operand[1].predicate) (trunc_y, srcmode))
3531 /* This is valid, but may not be cheaper than the original. */
3532 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET, speed);
3533 if (oldcost < newcost)
3536 else if (float_extend_from_mem[dstmode][srcmode])
3538 trunc_y = force_const_mem (srcmode, trunc_y);
3539 /* This is valid, but may not be cheaper than the original. */
3540 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET, speed);
3541 if (oldcost < newcost)
3543 trunc_y = validize_mem (trunc_y);
3548 /* For CSE's benefit, force the compressed constant pool entry
3549 into a new pseudo. This constant may be used in different modes,
3550 and if not, combine will put things back together for us. */
3551 trunc_y = force_reg (srcmode, trunc_y);
3552 emit_unop_insn (ic, x, trunc_y, UNKNOWN);
3553 last_insn = get_last_insn ();
3556 set_unique_reg_note (last_insn, REG_EQUAL, y);
3564 /* Pushing data onto the stack. */
3566 /* Push a block of length SIZE (perhaps variable)
3567 and return an rtx to address the beginning of the block.
3568 The value may be virtual_outgoing_args_rtx.
3570 EXTRA is the number of bytes of padding to push in addition to SIZE.
3571 BELOW nonzero means this padding comes at low addresses;
3572 otherwise, the padding comes at high addresses. */
3575 push_block (rtx size, int extra, int below)
3579 size = convert_modes (Pmode, ptr_mode, size, 1);
3580 if (CONSTANT_P (size))
3581 anti_adjust_stack (plus_constant (size, extra));
3582 else if (REG_P (size) && extra == 0)
3583 anti_adjust_stack (size);
3586 temp = copy_to_mode_reg (Pmode, size);
3588 temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
3589 temp, 0, OPTAB_LIB_WIDEN);
3590 anti_adjust_stack (temp);
3593 #ifndef STACK_GROWS_DOWNWARD
3599 temp = virtual_outgoing_args_rtx;
3600 if (extra != 0 && below)
3601 temp = plus_constant (temp, extra);
3605 if (CONST_INT_P (size))
3606 temp = plus_constant (virtual_outgoing_args_rtx,
3607 -INTVAL (size) - (below ? 0 : extra));
3608 else if (extra != 0 && !below)
3609 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3610 negate_rtx (Pmode, plus_constant (size, extra)));
3612 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3613 negate_rtx (Pmode, size));
3616 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
3619 #ifdef PUSH_ROUNDING
3621 /* Emit single push insn. */
3624 emit_single_push_insn (enum machine_mode mode, rtx x, tree type)
3627 unsigned rounded_size = PUSH_ROUNDING (GET_MODE_SIZE (mode));
3629 enum insn_code icode;
3630 insn_operand_predicate_fn pred;
3632 stack_pointer_delta += PUSH_ROUNDING (GET_MODE_SIZE (mode));
3633 /* If there is push pattern, use it. Otherwise try old way of throwing
3634 MEM representing push operation to move expander. */
3635 icode = optab_handler (push_optab, mode)->insn_code;
3636 if (icode != CODE_FOR_nothing)
3638 if (((pred = insn_data[(int) icode].operand[0].predicate)
3639 && !((*pred) (x, mode))))
3640 x = force_reg (mode, x);
3641 emit_insn (GEN_FCN (icode) (x));
3644 if (GET_MODE_SIZE (mode) == rounded_size)
3645 dest_addr = gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
3646 /* If we are to pad downward, adjust the stack pointer first and
3647 then store X into the stack location using an offset. This is
3648 because emit_move_insn does not know how to pad; it does not have
3650 else if (FUNCTION_ARG_PADDING (mode, type) == downward)
3652 unsigned padding_size = rounded_size - GET_MODE_SIZE (mode);
3653 HOST_WIDE_INT offset;
3655 emit_move_insn (stack_pointer_rtx,
3656 expand_binop (Pmode,
3657 #ifdef STACK_GROWS_DOWNWARD
3663 GEN_INT (rounded_size),
3664 NULL_RTX, 0, OPTAB_LIB_WIDEN));
3666 offset = (HOST_WIDE_INT) padding_size;
3667 #ifdef STACK_GROWS_DOWNWARD
3668 if (STACK_PUSH_CODE == POST_DEC)
3669 /* We have already decremented the stack pointer, so get the
3671 offset += (HOST_WIDE_INT) rounded_size;
3673 if (STACK_PUSH_CODE == POST_INC)
3674 /* We have already incremented the stack pointer, so get the
3676 offset -= (HOST_WIDE_INT) rounded_size;
3678 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offset));
3682 #ifdef STACK_GROWS_DOWNWARD
3683 /* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC. */
3684 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3685 GEN_INT (-(HOST_WIDE_INT) rounded_size));
3687 /* ??? This seems wrong if STACK_PUSH_CODE == POST_INC. */
3688 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3689 GEN_INT (rounded_size));
3691 dest_addr = gen_rtx_PRE_MODIFY (Pmode, stack_pointer_rtx, dest_addr);
3694 dest = gen_rtx_MEM (mode, dest_addr);
3698 set_mem_attributes (dest, type, 1);
3700 if (flag_optimize_sibling_calls)
3701 /* Function incoming arguments may overlap with sibling call
3702 outgoing arguments and we cannot allow reordering of reads
3703 from function arguments with stores to outgoing arguments
3704 of sibling calls. */
3705 set_mem_alias_set (dest, 0);
3707 emit_move_insn (dest, x);
3711 /* Generate code to push X onto the stack, assuming it has mode MODE and
3713 MODE is redundant except when X is a CONST_INT (since they don't
3715 SIZE is an rtx for the size of data to be copied (in bytes),
3716 needed only if X is BLKmode.
3718 ALIGN (in bits) is maximum alignment we can assume.
3720 If PARTIAL and REG are both nonzero, then copy that many of the first
3721 bytes of X into registers starting with REG, and push the rest of X.
3722 The amount of space pushed is decreased by PARTIAL bytes.
3723 REG must be a hard register in this case.
3724 If REG is zero but PARTIAL is not, take any all others actions for an
3725 argument partially in registers, but do not actually load any
3728 EXTRA is the amount in bytes of extra space to leave next to this arg.
3729 This is ignored if an argument block has already been allocated.
3731 On a machine that lacks real push insns, ARGS_ADDR is the address of
3732 the bottom of the argument block for this call. We use indexing off there
3733 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
3734 argument block has not been preallocated.
3736 ARGS_SO_FAR is the size of args previously pushed for this call.
3738 REG_PARM_STACK_SPACE is nonzero if functions require stack space
3739 for arguments passed in registers. If nonzero, it will be the number
3740 of bytes required. */
3743 emit_push_insn (rtx x, enum machine_mode mode, tree type, rtx size,
3744 unsigned int align, int partial, rtx reg, int extra,
3745 rtx args_addr, rtx args_so_far, int reg_parm_stack_space,
3749 enum direction stack_direction
3750 #ifdef STACK_GROWS_DOWNWARD
3756 /* Decide where to pad the argument: `downward' for below,
3757 `upward' for above, or `none' for don't pad it.
3758 Default is below for small data on big-endian machines; else above. */
3759 enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
3761 /* Invert direction if stack is post-decrement.
3763 if (STACK_PUSH_CODE == POST_DEC)
3764 if (where_pad != none)
3765 where_pad = (where_pad == downward ? upward : downward);
3770 || (STRICT_ALIGNMENT && align < GET_MODE_ALIGNMENT (mode)))
3772 /* Copy a block into the stack, entirely or partially. */
3779 offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3780 used = partial - offset;
3782 if (mode != BLKmode)
3784 /* A value is to be stored in an insufficiently aligned
3785 stack slot; copy via a suitably aligned slot if
3787 size = GEN_INT (GET_MODE_SIZE (mode));
3788 if (!MEM_P (xinner))
3790 temp = assign_temp (type, 0, 1, 1);
3791 emit_move_insn (temp, xinner);
3798 /* USED is now the # of bytes we need not copy to the stack
3799 because registers will take care of them. */
3802 xinner = adjust_address (xinner, BLKmode, used);
3804 /* If the partial register-part of the arg counts in its stack size,
3805 skip the part of stack space corresponding to the registers.
3806 Otherwise, start copying to the beginning of the stack space,
3807 by setting SKIP to 0. */
3808 skip = (reg_parm_stack_space == 0) ? 0 : used;
3810 #ifdef PUSH_ROUNDING
3811 /* Do it with several push insns if that doesn't take lots of insns
3812 and if there is no difficulty with push insns that skip bytes
3813 on the stack for alignment purposes. */
3816 && CONST_INT_P (size)
3818 && MEM_ALIGN (xinner) >= align
3819 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size) - used, align))
3820 /* Here we avoid the case of a structure whose weak alignment
3821 forces many pushes of a small amount of data,
3822 and such small pushes do rounding that causes trouble. */
3823 && ((! SLOW_UNALIGNED_ACCESS (word_mode, align))
3824 || align >= BIGGEST_ALIGNMENT
3825 || (PUSH_ROUNDING (align / BITS_PER_UNIT)
3826 == (align / BITS_PER_UNIT)))
3827 && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
3829 /* Push padding now if padding above and stack grows down,
3830 or if padding below and stack grows up.
3831 But if space already allocated, this has already been done. */
3832 if (extra && args_addr == 0
3833 && where_pad != none && where_pad != stack_direction)
3834 anti_adjust_stack (GEN_INT (extra));
3836 move_by_pieces (NULL, xinner, INTVAL (size) - used, align, 0);
3839 #endif /* PUSH_ROUNDING */
3843 /* Otherwise make space on the stack and copy the data
3844 to the address of that space. */
3846 /* Deduct words put into registers from the size we must copy. */
3849 if (CONST_INT_P (size))
3850 size = GEN_INT (INTVAL (size) - used);
3852 size = expand_binop (GET_MODE (size), sub_optab, size,
3853 GEN_INT (used), NULL_RTX, 0,
3857 /* Get the address of the stack space.
3858 In this case, we do not deal with EXTRA separately.
3859 A single stack adjust will do. */
3862 temp = push_block (size, extra, where_pad == downward);
3865 else if (CONST_INT_P (args_so_far))
3866 temp = memory_address (BLKmode,
3867 plus_constant (args_addr,
3868 skip + INTVAL (args_so_far)));
3870 temp = memory_address (BLKmode,
3871 plus_constant (gen_rtx_PLUS (Pmode,
3876 if (!ACCUMULATE_OUTGOING_ARGS)
3878 /* If the source is referenced relative to the stack pointer,
3879 copy it to another register to stabilize it. We do not need
3880 to do this if we know that we won't be changing sp. */
3882 if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
3883 || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
3884 temp = copy_to_reg (temp);
3887 target = gen_rtx_MEM (BLKmode, temp);
3889 /* We do *not* set_mem_attributes here, because incoming arguments
3890 may overlap with sibling call outgoing arguments and we cannot
3891 allow reordering of reads from function arguments with stores
3892 to outgoing arguments of sibling calls. We do, however, want
3893 to record the alignment of the stack slot. */
3894 /* ALIGN may well be better aligned than TYPE, e.g. due to
3895 PARM_BOUNDARY. Assume the caller isn't lying. */
3896 set_mem_align (target, align);
3898 emit_block_move (target, xinner, size, BLOCK_OP_CALL_PARM);
3901 else if (partial > 0)
3903 /* Scalar partly in registers. */
3905 int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
3908 /* # bytes of start of argument
3909 that we must make space for but need not store. */
3910 int offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3911 int args_offset = INTVAL (args_so_far);
3914 /* Push padding now if padding above and stack grows down,
3915 or if padding below and stack grows up.
3916 But if space already allocated, this has already been done. */
3917 if (extra && args_addr == 0
3918 && where_pad != none && where_pad != stack_direction)
3919 anti_adjust_stack (GEN_INT (extra));
3921 /* If we make space by pushing it, we might as well push
3922 the real data. Otherwise, we can leave OFFSET nonzero
3923 and leave the space uninitialized. */
3927 /* Now NOT_STACK gets the number of words that we don't need to
3928 allocate on the stack. Convert OFFSET to words too. */
3929 not_stack = (partial - offset) / UNITS_PER_WORD;
3930 offset /= UNITS_PER_WORD;
3932 /* If the partial register-part of the arg counts in its stack size,
3933 skip the part of stack space corresponding to the registers.
3934 Otherwise, start copying to the beginning of the stack space,
3935 by setting SKIP to 0. */
3936 skip = (reg_parm_stack_space == 0) ? 0 : not_stack;
3938 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
3939 x = validize_mem (force_const_mem (mode, x));
3941 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
3942 SUBREGs of such registers are not allowed. */
3943 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER
3944 && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
3945 x = copy_to_reg (x);
3947 /* Loop over all the words allocated on the stack for this arg. */
3948 /* We can do it by words, because any scalar bigger than a word
3949 has a size a multiple of a word. */
3950 #ifndef PUSH_ARGS_REVERSED
3951 for (i = not_stack; i < size; i++)
3953 for (i = size - 1; i >= not_stack; i--)
3955 if (i >= not_stack + offset)
3956 emit_push_insn (operand_subword_force (x, i, mode),
3957 word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
3959 GEN_INT (args_offset + ((i - not_stack + skip)
3961 reg_parm_stack_space, alignment_pad);
3968 /* Push padding now if padding above and stack grows down,
3969 or if padding below and stack grows up.
3970 But if space already allocated, this has already been done. */
3971 if (extra && args_addr == 0
3972 && where_pad != none && where_pad != stack_direction)
3973 anti_adjust_stack (GEN_INT (extra));
3975 #ifdef PUSH_ROUNDING
3976 if (args_addr == 0 && PUSH_ARGS)
3977 emit_single_push_insn (mode, x, type);
3981 if (CONST_INT_P (args_so_far))
3983 = memory_address (mode,
3984 plus_constant (args_addr,
3985 INTVAL (args_so_far)));
3987 addr = memory_address (mode, gen_rtx_PLUS (Pmode, args_addr,
3989 dest = gen_rtx_MEM (mode, addr);
3991 /* We do *not* set_mem_attributes here, because incoming arguments
3992 may overlap with sibling call outgoing arguments and we cannot
3993 allow reordering of reads from function arguments with stores
3994 to outgoing arguments of sibling calls. We do, however, want
3995 to record the alignment of the stack slot. */
3996 /* ALIGN may well be better aligned than TYPE, e.g. due to
3997 PARM_BOUNDARY. Assume the caller isn't lying. */
3998 set_mem_align (dest, align);
4000 emit_move_insn (dest, x);
4004 /* If part should go in registers, copy that part
4005 into the appropriate registers. Do this now, at the end,
4006 since mem-to-mem copies above may do function calls. */
4007 if (partial > 0 && reg != 0)
4009 /* Handle calls that pass values in multiple non-contiguous locations.
4010 The Irix 6 ABI has examples of this. */
4011 if (GET_CODE (reg) == PARALLEL)
4012 emit_group_load (reg, x, type, -1);
4015 gcc_assert (partial % UNITS_PER_WORD == 0);
4016 move_block_to_reg (REGNO (reg), x, partial / UNITS_PER_WORD, mode);
4020 if (extra && args_addr == 0 && where_pad == stack_direction)
4021 anti_adjust_stack (GEN_INT (extra));
4023 if (alignment_pad && args_addr == 0)
4024 anti_adjust_stack (alignment_pad);
4027 /* Return X if X can be used as a subtarget in a sequence of arithmetic
4031 get_subtarget (rtx x)
4035 /* Only registers can be subtargets. */
4037 /* Don't use hard regs to avoid extending their life. */
4038 || REGNO (x) < FIRST_PSEUDO_REGISTER
4042 /* A subroutine of expand_assignment. Optimize FIELD op= VAL, where
4043 FIELD is a bitfield. Returns true if the optimization was successful,
4044 and there's nothing else to do. */
4047 optimize_bitfield_assignment_op (unsigned HOST_WIDE_INT bitsize,
4048 unsigned HOST_WIDE_INT bitpos,
4049 enum machine_mode mode1, rtx str_rtx,
4052 enum machine_mode str_mode = GET_MODE (str_rtx);
4053 unsigned int str_bitsize = GET_MODE_BITSIZE (str_mode);
4058 if (mode1 != VOIDmode
4059 || bitsize >= BITS_PER_WORD
4060 || str_bitsize > BITS_PER_WORD
4061 || TREE_SIDE_EFFECTS (to)
4062 || TREE_THIS_VOLATILE (to))
4066 if (!BINARY_CLASS_P (src)
4067 || TREE_CODE (TREE_TYPE (src)) != INTEGER_TYPE)
4070 op0 = TREE_OPERAND (src, 0);
4071 op1 = TREE_OPERAND (src, 1);
4074 if (!operand_equal_p (to, op0, 0))
4077 if (MEM_P (str_rtx))
4079 unsigned HOST_WIDE_INT offset1;
4081 if (str_bitsize == 0 || str_bitsize > BITS_PER_WORD)
4082 str_mode = word_mode;
4083 str_mode = get_best_mode (bitsize, bitpos,
4084 MEM_ALIGN (str_rtx), str_mode, 0);
4085 if (str_mode == VOIDmode)
4087 str_bitsize = GET_MODE_BITSIZE (str_mode);
4090 bitpos %= str_bitsize;
4091 offset1 = (offset1 - bitpos) / BITS_PER_UNIT;
4092 str_rtx = adjust_address (str_rtx, str_mode, offset1);
4094 else if (!REG_P (str_rtx) && GET_CODE (str_rtx) != SUBREG)
4097 /* If the bit field covers the whole REG/MEM, store_field
4098 will likely generate better code. */
4099 if (bitsize >= str_bitsize)
4102 /* We can't handle fields split across multiple entities. */
4103 if (bitpos + bitsize > str_bitsize)
4106 if (BYTES_BIG_ENDIAN)
4107 bitpos = str_bitsize - bitpos - bitsize;
4109 switch (TREE_CODE (src))
4113 /* For now, just optimize the case of the topmost bitfield
4114 where we don't need to do any masking and also
4115 1 bit bitfields where xor can be used.
4116 We might win by one instruction for the other bitfields
4117 too if insv/extv instructions aren't used, so that
4118 can be added later. */
4119 if (bitpos + bitsize != str_bitsize
4120 && (bitsize != 1 || TREE_CODE (op1) != INTEGER_CST))
4123 value = expand_expr (op1, NULL_RTX, str_mode, EXPAND_NORMAL);
4124 value = convert_modes (str_mode,
4125 TYPE_MODE (TREE_TYPE (op1)), value,
4126 TYPE_UNSIGNED (TREE_TYPE (op1)));
4128 /* We may be accessing data outside the field, which means
4129 we can alias adjacent data. */
4130 if (MEM_P (str_rtx))
4132 str_rtx = shallow_copy_rtx (str_rtx);
4133 set_mem_alias_set (str_rtx, 0);
4134 set_mem_expr (str_rtx, 0);
4137 binop = TREE_CODE (src) == PLUS_EXPR ? add_optab : sub_optab;
4138 if (bitsize == 1 && bitpos + bitsize != str_bitsize)
4140 value = expand_and (str_mode, value, const1_rtx, NULL);
4143 value = expand_shift (LSHIFT_EXPR, str_mode, value,
4144 build_int_cst (NULL_TREE, bitpos),
4146 result = expand_binop (str_mode, binop, str_rtx,
4147 value, str_rtx, 1, OPTAB_WIDEN);
4148 if (result != str_rtx)
4149 emit_move_insn (str_rtx, result);
4154 if (TREE_CODE (op1) != INTEGER_CST)
4156 value = expand_expr (op1, NULL_RTX, GET_MODE (str_rtx), EXPAND_NORMAL);
4157 value = convert_modes (GET_MODE (str_rtx),
4158 TYPE_MODE (TREE_TYPE (op1)), value,
4159 TYPE_UNSIGNED (TREE_TYPE (op1)));
4161 /* We may be accessing data outside the field, which means
4162 we can alias adjacent data. */
4163 if (MEM_P (str_rtx))
4165 str_rtx = shallow_copy_rtx (str_rtx);
4166 set_mem_alias_set (str_rtx, 0);
4167 set_mem_expr (str_rtx, 0);
4170 binop = TREE_CODE (src) == BIT_IOR_EXPR ? ior_optab : xor_optab;
4171 if (bitpos + bitsize != GET_MODE_BITSIZE (GET_MODE (str_rtx)))
4173 rtx mask = GEN_INT (((unsigned HOST_WIDE_INT) 1 << bitsize)
4175 value = expand_and (GET_MODE (str_rtx), value, mask,
4178 value = expand_shift (LSHIFT_EXPR, GET_MODE (str_rtx), value,
4179 build_int_cst (NULL_TREE, bitpos),
4181 result = expand_binop (GET_MODE (str_rtx), binop, str_rtx,
4182 value, str_rtx, 1, OPTAB_WIDEN);
4183 if (result != str_rtx)
4184 emit_move_insn (str_rtx, result);
4195 /* Expand an assignment that stores the value of FROM into TO. If NONTEMPORAL
4196 is true, try generating a nontemporal store. */
4199 expand_assignment (tree to, tree from, bool nontemporal)
4204 /* Don't crash if the lhs of the assignment was erroneous. */
4205 if (TREE_CODE (to) == ERROR_MARK)
4207 result = expand_normal (from);
4211 /* Optimize away no-op moves without side-effects. */
4212 if (operand_equal_p (to, from, 0))
4215 /* Assignment of a structure component needs special treatment
4216 if the structure component's rtx is not simply a MEM.
4217 Assignment of an array element at a constant index, and assignment of
4218 an array element in an unaligned packed structure field, has the same
4220 if (handled_component_p (to)
4221 || TREE_CODE (TREE_TYPE (to)) == ARRAY_TYPE)
4223 enum machine_mode mode1;
4224 HOST_WIDE_INT bitsize, bitpos;
4231 tem = get_inner_reference (to, &bitsize, &bitpos, &offset, &mode1,
4232 &unsignedp, &volatilep, true);
4234 /* If we are going to use store_bit_field and extract_bit_field,
4235 make sure to_rtx will be safe for multiple use. */
4237 to_rtx = expand_normal (tem);
4241 enum machine_mode address_mode;
4244 if (!MEM_P (to_rtx))
4246 /* We can get constant negative offsets into arrays with broken
4247 user code. Translate this to a trap instead of ICEing. */
4248 gcc_assert (TREE_CODE (offset) == INTEGER_CST);
4249 expand_builtin_trap ();
4250 to_rtx = gen_rtx_MEM (BLKmode, const0_rtx);
4253 offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, EXPAND_SUM);
4255 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (to_rtx));
4256 if (GET_MODE (offset_rtx) != address_mode)
4257 offset_rtx = convert_to_mode (address_mode, offset_rtx, 0);
4259 /* A constant address in TO_RTX can have VOIDmode, we must not try
4260 to call force_reg for that case. Avoid that case. */
4262 && GET_MODE (to_rtx) == BLKmode
4263 && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
4265 && (bitpos % bitsize) == 0
4266 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
4267 && MEM_ALIGN (to_rtx) == GET_MODE_ALIGNMENT (mode1))
4269 to_rtx = adjust_address (to_rtx, mode1, bitpos / BITS_PER_UNIT);
4273 to_rtx = offset_address (to_rtx, offset_rtx,
4274 highest_pow2_factor_for_target (to,
4278 /* Handle expand_expr of a complex value returning a CONCAT. */
4279 if (GET_CODE (to_rtx) == CONCAT)
4281 if (COMPLEX_MODE_P (TYPE_MODE (TREE_TYPE (from))))
4283 gcc_assert (bitpos == 0);
4284 result = store_expr (from, to_rtx, false, nontemporal);
4288 gcc_assert (bitpos == 0 || bitpos == GET_MODE_BITSIZE (mode1));
4289 result = store_expr (from, XEXP (to_rtx, bitpos != 0), false,
4297 /* If the field is at offset zero, we could have been given the
4298 DECL_RTX of the parent struct. Don't munge it. */
4299 to_rtx = shallow_copy_rtx (to_rtx);
4301 set_mem_attributes_minus_bitpos (to_rtx, to, 0, bitpos);
4303 /* Deal with volatile and readonly fields. The former is only
4304 done for MEM. Also set MEM_KEEP_ALIAS_SET_P if needed. */
4306 MEM_VOLATILE_P (to_rtx) = 1;
4307 if (component_uses_parent_alias_set (to))
4308 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
4311 if (optimize_bitfield_assignment_op (bitsize, bitpos, mode1,
4315 result = store_field (to_rtx, bitsize, bitpos, mode1, from,
4316 TREE_TYPE (tem), get_alias_set (to),
4321 preserve_temp_slots (result);
4327 else if (TREE_CODE (to) == MISALIGNED_INDIRECT_REF)
4329 addr_space_t as = ADDR_SPACE_GENERIC;
4330 enum machine_mode mode, op_mode1;
4331 enum insn_code icode;
4332 rtx reg, addr, mem, insn;
4334 if (POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (to, 0))))
4335 as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (to, 0))));
4337 reg = expand_expr (from, NULL_RTX, VOIDmode, EXPAND_NORMAL);
4338 reg = force_not_mem (reg);
4340 mode = TYPE_MODE (TREE_TYPE (to));
4341 addr = expand_expr (TREE_OPERAND (to, 0), NULL_RTX, VOIDmode,
4343 addr = memory_address_addr_space (mode, addr, as);
4344 mem = gen_rtx_MEM (mode, addr);
4346 set_mem_attributes (mem, to, 0);
4347 set_mem_addr_space (mem, as);
4349 icode = movmisalign_optab->handlers[mode].insn_code;
4350 gcc_assert (icode != CODE_FOR_nothing);
4352 op_mode1 = insn_data[icode].operand[1].mode;
4353 if (! (*insn_data[icode].operand[1].predicate) (reg, op_mode1)
4354 && op_mode1 != VOIDmode)
4355 reg = copy_to_mode_reg (op_mode1, reg);
4357 insn = GEN_FCN (icode) (mem, reg);
4362 /* If the rhs is a function call and its value is not an aggregate,
4363 call the function before we start to compute the lhs.
4364 This is needed for correct code for cases such as
4365 val = setjmp (buf) on machines where reference to val
4366 requires loading up part of an address in a separate insn.
4368 Don't do this if TO is a VAR_DECL or PARM_DECL whose DECL_RTL is REG
4369 since it might be a promoted variable where the zero- or sign- extension
4370 needs to be done. Handling this in the normal way is safe because no
4371 computation is done before the call. The same is true for SSA names. */
4372 if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from, from)
4373 && COMPLETE_TYPE_P (TREE_TYPE (from))
4374 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from))) == INTEGER_CST
4375 && ! (((TREE_CODE (to) == VAR_DECL || TREE_CODE (to) == PARM_DECL)
4376 && REG_P (DECL_RTL (to)))
4377 || TREE_CODE (to) == SSA_NAME))
4382 value = expand_normal (from);
4384 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4386 /* Handle calls that return values in multiple non-contiguous locations.
4387 The Irix 6 ABI has examples of this. */
4388 if (GET_CODE (to_rtx) == PARALLEL)
4389 emit_group_load (to_rtx, value, TREE_TYPE (from),
4390 int_size_in_bytes (TREE_TYPE (from)));
4391 else if (GET_MODE (to_rtx) == BLKmode)
4392 emit_block_move (to_rtx, value, expr_size (from), BLOCK_OP_NORMAL);
4395 if (POINTER_TYPE_P (TREE_TYPE (to)))
4396 value = convert_memory_address_addr_space
4397 (GET_MODE (to_rtx), value,
4398 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (to))));
4400 emit_move_insn (to_rtx, value);
4402 preserve_temp_slots (to_rtx);
4408 /* Ordinary treatment. Expand TO to get a REG or MEM rtx.
4409 Don't re-expand if it was expanded already (in COMPONENT_REF case). */
4412 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4414 /* Don't move directly into a return register. */
4415 if (TREE_CODE (to) == RESULT_DECL
4416 && (REG_P (to_rtx) || GET_CODE (to_rtx) == PARALLEL))
4421 temp = expand_expr (from, NULL_RTX, GET_MODE (to_rtx), EXPAND_NORMAL);
4423 if (GET_CODE (to_rtx) == PARALLEL)
4424 emit_group_load (to_rtx, temp, TREE_TYPE (from),
4425 int_size_in_bytes (TREE_TYPE (from)));
4427 emit_move_insn (to_rtx, temp);
4429 preserve_temp_slots (to_rtx);
4435 /* In case we are returning the contents of an object which overlaps
4436 the place the value is being stored, use a safe function when copying
4437 a value through a pointer into a structure value return block. */
4438 if (TREE_CODE (to) == RESULT_DECL
4439 && TREE_CODE (from) == INDIRECT_REF
4440 && ADDR_SPACE_GENERIC_P
4441 (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (from, 0)))))
4442 && refs_may_alias_p (to, from)
4443 && cfun->returns_struct
4444 && !cfun->returns_pcc_struct)
4449 size = expr_size (from);
4450 from_rtx = expand_normal (from);
4452 emit_library_call (memmove_libfunc, LCT_NORMAL,
4453 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
4454 XEXP (from_rtx, 0), Pmode,
4455 convert_to_mode (TYPE_MODE (sizetype),
4456 size, TYPE_UNSIGNED (sizetype)),
4457 TYPE_MODE (sizetype));
4459 preserve_temp_slots (to_rtx);
4465 /* Compute FROM and store the value in the rtx we got. */
4468 result = store_expr (from, to_rtx, 0, nontemporal);
4469 preserve_temp_slots (result);
4475 /* Emits nontemporal store insn that moves FROM to TO. Returns true if this
4476 succeeded, false otherwise. */
4479 emit_storent_insn (rtx to, rtx from)
4481 enum machine_mode mode = GET_MODE (to), imode;
4482 enum insn_code code = optab_handler (storent_optab, mode)->insn_code;
4485 if (code == CODE_FOR_nothing)
4488 imode = insn_data[code].operand[0].mode;
4489 if (!insn_data[code].operand[0].predicate (to, imode))
4492 imode = insn_data[code].operand[1].mode;
4493 if (!insn_data[code].operand[1].predicate (from, imode))
4495 from = copy_to_mode_reg (imode, from);
4496 if (!insn_data[code].operand[1].predicate (from, imode))
4500 pattern = GEN_FCN (code) (to, from);
4501 if (pattern == NULL_RTX)
4504 emit_insn (pattern);
4508 /* Generate code for computing expression EXP,
4509 and storing the value into TARGET.
4511 If the mode is BLKmode then we may return TARGET itself.
4512 It turns out that in BLKmode it doesn't cause a problem.
4513 because C has no operators that could combine two different
4514 assignments into the same BLKmode object with different values
4515 with no sequence point. Will other languages need this to
4518 If CALL_PARAM_P is nonzero, this is a store into a call param on the
4519 stack, and block moves may need to be treated specially.
4521 If NONTEMPORAL is true, try using a nontemporal store instruction. */
4524 store_expr (tree exp, rtx target, int call_param_p, bool nontemporal)
4527 rtx alt_rtl = NULL_RTX;
4528 location_t loc = EXPR_LOCATION (exp);
4530 if (VOID_TYPE_P (TREE_TYPE (exp)))
4532 /* C++ can generate ?: expressions with a throw expression in one
4533 branch and an rvalue in the other. Here, we resolve attempts to
4534 store the throw expression's nonexistent result. */
4535 gcc_assert (!call_param_p);
4536 expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL);
4539 if (TREE_CODE (exp) == COMPOUND_EXPR)
4541 /* Perform first part of compound expression, then assign from second
4543 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
4544 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4545 return store_expr (TREE_OPERAND (exp, 1), target, call_param_p,
4548 else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
4550 /* For conditional expression, get safe form of the target. Then
4551 test the condition, doing the appropriate assignment on either
4552 side. This avoids the creation of unnecessary temporaries.
4553 For non-BLKmode, it is more efficient not to do this. */
4555 rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();
4557 do_pending_stack_adjust ();
4559 jumpifnot (TREE_OPERAND (exp, 0), lab1, -1);
4560 store_expr (TREE_OPERAND (exp, 1), target, call_param_p,
4562 emit_jump_insn (gen_jump (lab2));
4565 store_expr (TREE_OPERAND (exp, 2), target, call_param_p,
4572 else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
4573 /* If this is a scalar in a register that is stored in a wider mode
4574 than the declared mode, compute the result into its declared mode
4575 and then convert to the wider mode. Our value is the computed
4578 rtx inner_target = 0;
4580 /* We can do the conversion inside EXP, which will often result
4581 in some optimizations. Do the conversion in two steps: first
4582 change the signedness, if needed, then the extend. But don't
4583 do this if the type of EXP is a subtype of something else
4584 since then the conversion might involve more than just
4585 converting modes. */
4586 if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
4587 && TREE_TYPE (TREE_TYPE (exp)) == 0
4588 && GET_MODE_PRECISION (GET_MODE (target))
4589 == TYPE_PRECISION (TREE_TYPE (exp)))
4591 if (TYPE_UNSIGNED (TREE_TYPE (exp))
4592 != SUBREG_PROMOTED_UNSIGNED_P (target))
4594 /* Some types, e.g. Fortran's logical*4, won't have a signed
4595 version, so use the mode instead. */
4597 = (signed_or_unsigned_type_for
4598 (SUBREG_PROMOTED_UNSIGNED_P (target), TREE_TYPE (exp)));
4600 ntype = lang_hooks.types.type_for_mode
4601 (TYPE_MODE (TREE_TYPE (exp)),
4602 SUBREG_PROMOTED_UNSIGNED_P (target));
4604 exp = fold_convert_loc (loc, ntype, exp);
4607 exp = fold_convert_loc (loc, lang_hooks.types.type_for_mode
4608 (GET_MODE (SUBREG_REG (target)),
4609 SUBREG_PROMOTED_UNSIGNED_P (target)),
4612 inner_target = SUBREG_REG (target);
4615 temp = expand_expr (exp, inner_target, VOIDmode,
4616 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4618 /* If TEMP is a VOIDmode constant, use convert_modes to make
4619 sure that we properly convert it. */
4620 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
4622 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4623 temp, SUBREG_PROMOTED_UNSIGNED_P (target));
4624 temp = convert_modes (GET_MODE (SUBREG_REG (target)),
4625 GET_MODE (target), temp,
4626 SUBREG_PROMOTED_UNSIGNED_P (target));
4629 convert_move (SUBREG_REG (target), temp,
4630 SUBREG_PROMOTED_UNSIGNED_P (target));
4634 else if (TREE_CODE (exp) == STRING_CST
4635 && !nontemporal && !call_param_p
4636 && TREE_STRING_LENGTH (exp) > 0
4637 && TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
4639 /* Optimize initialization of an array with a STRING_CST. */
4640 HOST_WIDE_INT exp_len, str_copy_len;
4643 exp_len = int_expr_size (exp);
4647 str_copy_len = strlen (TREE_STRING_POINTER (exp));
4648 if (str_copy_len < TREE_STRING_LENGTH (exp) - 1)
4651 str_copy_len = TREE_STRING_LENGTH (exp);
4652 if ((STORE_MAX_PIECES & (STORE_MAX_PIECES - 1)) == 0)
4654 str_copy_len += STORE_MAX_PIECES - 1;
4655 str_copy_len &= ~(STORE_MAX_PIECES - 1);
4657 str_copy_len = MIN (str_copy_len, exp_len);
4658 if (!can_store_by_pieces (str_copy_len, builtin_strncpy_read_str,
4659 CONST_CAST(char *, TREE_STRING_POINTER (exp)),
4660 MEM_ALIGN (target), false))
4665 dest_mem = store_by_pieces (dest_mem,
4666 str_copy_len, builtin_strncpy_read_str,
4667 CONST_CAST(char *, TREE_STRING_POINTER (exp)),
4668 MEM_ALIGN (target), false,
4669 exp_len > str_copy_len ? 1 : 0);
4670 if (exp_len > str_copy_len)
4671 clear_storage (adjust_address (dest_mem, BLKmode, 0),
4672 GEN_INT (exp_len - str_copy_len),
4681 /* If we want to use a nontemporal store, force the value to
4683 tmp_target = nontemporal ? NULL_RTX : target;
4684 temp = expand_expr_real (exp, tmp_target, GET_MODE (target),
4686 ? EXPAND_STACK_PARM : EXPAND_NORMAL),
4690 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
4691 the same as that of TARGET, adjust the constant. This is needed, for
4692 example, in case it is a CONST_DOUBLE and we want only a word-sized
4694 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode
4695 && TREE_CODE (exp) != ERROR_MARK
4696 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
4697 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4698 temp, TYPE_UNSIGNED (TREE_TYPE (exp)));
4700 /* If value was not generated in the target, store it there.
4701 Convert the value to TARGET's type first if necessary and emit the
4702 pending incrementations that have been queued when expanding EXP.
4703 Note that we cannot emit the whole queue blindly because this will
4704 effectively disable the POST_INC optimization later.
4706 If TEMP and TARGET compare equal according to rtx_equal_p, but
4707 one or both of them are volatile memory refs, we have to distinguish
4709 - expand_expr has used TARGET. In this case, we must not generate
4710 another copy. This can be detected by TARGET being equal according
4712 - expand_expr has not used TARGET - that means that the source just
4713 happens to have the same RTX form. Since temp will have been created
4714 by expand_expr, it will compare unequal according to == .
4715 We must generate a copy in this case, to reach the correct number
4716 of volatile memory references. */
4718 if ((! rtx_equal_p (temp, target)
4719 || (temp != target && (side_effects_p (temp)
4720 || side_effects_p (target))))
4721 && TREE_CODE (exp) != ERROR_MARK
4722 /* If store_expr stores a DECL whose DECL_RTL(exp) == TARGET,
4723 but TARGET is not valid memory reference, TEMP will differ
4724 from TARGET although it is really the same location. */
4725 && !(alt_rtl && rtx_equal_p (alt_rtl, target))
4726 /* If there's nothing to copy, don't bother. Don't call
4727 expr_size unless necessary, because some front-ends (C++)
4728 expr_size-hook must not be given objects that are not
4729 supposed to be bit-copied or bit-initialized. */
4730 && expr_size (exp) != const0_rtx)
4732 if (GET_MODE (temp) != GET_MODE (target)
4733 && GET_MODE (temp) != VOIDmode)
4735 int unsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
4736 if (GET_MODE (target) == BLKmode
4737 || GET_MODE (temp) == BLKmode)
4738 emit_block_move (target, temp, expr_size (exp),
4740 ? BLOCK_OP_CALL_PARM
4741 : BLOCK_OP_NORMAL));
4743 convert_move (target, temp, unsignedp);
4746 else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
4748 /* Handle copying a string constant into an array. The string
4749 constant may be shorter than the array. So copy just the string's
4750 actual length, and clear the rest. First get the size of the data
4751 type of the string, which is actually the size of the target. */
4752 rtx size = expr_size (exp);
4754 if (CONST_INT_P (size)
4755 && INTVAL (size) < TREE_STRING_LENGTH (exp))
4756 emit_block_move (target, temp, size,
4758 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4761 enum machine_mode pointer_mode
4762 = targetm.addr_space.pointer_mode (MEM_ADDR_SPACE (target));
4763 enum machine_mode address_mode
4764 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (target));
4766 /* Compute the size of the data to copy from the string. */
4768 = size_binop_loc (loc, MIN_EXPR,
4769 make_tree (sizetype, size),
4770 size_int (TREE_STRING_LENGTH (exp)));
4772 = expand_expr (copy_size, NULL_RTX, VOIDmode,
4774 ? EXPAND_STACK_PARM : EXPAND_NORMAL));
4777 /* Copy that much. */
4778 copy_size_rtx = convert_to_mode (pointer_mode, copy_size_rtx,
4779 TYPE_UNSIGNED (sizetype));
4780 emit_block_move (target, temp, copy_size_rtx,
4782 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4784 /* Figure out how much is left in TARGET that we have to clear.
4785 Do all calculations in pointer_mode. */
4786 if (CONST_INT_P (copy_size_rtx))
4788 size = plus_constant (size, -INTVAL (copy_size_rtx));
4789 target = adjust_address (target, BLKmode,
4790 INTVAL (copy_size_rtx));
4794 size = expand_binop (TYPE_MODE (sizetype), sub_optab, size,
4795 copy_size_rtx, NULL_RTX, 0,
4798 if (GET_MODE (copy_size_rtx) != address_mode)
4799 copy_size_rtx = convert_to_mode (address_mode,
4801 TYPE_UNSIGNED (sizetype));
4803 target = offset_address (target, copy_size_rtx,
4804 highest_pow2_factor (copy_size));
4805 label = gen_label_rtx ();
4806 emit_cmp_and_jump_insns (size, const0_rtx, LT, NULL_RTX,
4807 GET_MODE (size), 0, label);
4810 if (size != const0_rtx)
4811 clear_storage (target, size, BLOCK_OP_NORMAL);
4817 /* Handle calls that return values in multiple non-contiguous locations.
4818 The Irix 6 ABI has examples of this. */
4819 else if (GET_CODE (target) == PARALLEL)
4820 emit_group_load (target, temp, TREE_TYPE (exp),
4821 int_size_in_bytes (TREE_TYPE (exp)));
4822 else if (GET_MODE (temp) == BLKmode)
4823 emit_block_move (target, temp, expr_size (exp),
4825 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4826 else if (nontemporal
4827 && emit_storent_insn (target, temp))
4828 /* If we managed to emit a nontemporal store, there is nothing else to
4833 temp = force_operand (temp, target);
4835 emit_move_insn (target, temp);
4842 /* Helper for categorize_ctor_elements. Identical interface. */
4845 categorize_ctor_elements_1 (const_tree ctor, HOST_WIDE_INT *p_nz_elts,
4846 HOST_WIDE_INT *p_elt_count,
4849 unsigned HOST_WIDE_INT idx;
4850 HOST_WIDE_INT nz_elts, elt_count;
4851 tree value, purpose;
4853 /* Whether CTOR is a valid constant initializer, in accordance with what
4854 initializer_constant_valid_p does. If inferred from the constructor
4855 elements, true until proven otherwise. */
4856 bool const_from_elts_p = constructor_static_from_elts_p (ctor);
4857 bool const_p = const_from_elts_p ? true : TREE_STATIC (ctor);
4862 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), idx, purpose, value)
4867 if (TREE_CODE (purpose) == RANGE_EXPR)
4869 tree lo_index = TREE_OPERAND (purpose, 0);
4870 tree hi_index = TREE_OPERAND (purpose, 1);
4872 if (host_integerp (lo_index, 1) && host_integerp (hi_index, 1))
4873 mult = (tree_low_cst (hi_index, 1)
4874 - tree_low_cst (lo_index, 1) + 1);
4877 switch (TREE_CODE (value))
4881 HOST_WIDE_INT nz = 0, ic = 0;
4884 = categorize_ctor_elements_1 (value, &nz, &ic, p_must_clear);
4886 nz_elts += mult * nz;
4887 elt_count += mult * ic;
4889 if (const_from_elts_p && const_p)
4890 const_p = const_elt_p;
4897 if (!initializer_zerop (value))
4903 nz_elts += mult * TREE_STRING_LENGTH (value);
4904 elt_count += mult * TREE_STRING_LENGTH (value);
4908 if (!initializer_zerop (TREE_REALPART (value)))
4910 if (!initializer_zerop (TREE_IMAGPART (value)))
4918 for (v = TREE_VECTOR_CST_ELTS (value); v; v = TREE_CHAIN (v))
4920 if (!initializer_zerop (TREE_VALUE (v)))
4931 if (const_from_elts_p && const_p)
4932 const_p = initializer_constant_valid_p (value, TREE_TYPE (value))
4939 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4940 || TREE_CODE (TREE_TYPE (ctor)) == QUAL_UNION_TYPE))
4943 bool clear_this = true;
4945 if (!VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)))
4947 /* We don't expect more than one element of the union to be
4948 initialized. Not sure what we should do otherwise... */
4949 gcc_assert (VEC_length (constructor_elt, CONSTRUCTOR_ELTS (ctor))
4952 init_sub_type = TREE_TYPE (VEC_index (constructor_elt,
4953 CONSTRUCTOR_ELTS (ctor),
4956 /* ??? We could look at each element of the union, and find the
4957 largest element. Which would avoid comparing the size of the
4958 initialized element against any tail padding in the union.
4959 Doesn't seem worth the effort... */
4960 if (simple_cst_equal (TYPE_SIZE (TREE_TYPE (ctor)),
4961 TYPE_SIZE (init_sub_type)) == 1)
4963 /* And now we have to find out if the element itself is fully
4964 constructed. E.g. for union { struct { int a, b; } s; } u
4965 = { .s = { .a = 1 } }. */
4966 if (elt_count == count_type_elements (init_sub_type, false))
4971 *p_must_clear = clear_this;
4974 *p_nz_elts += nz_elts;
4975 *p_elt_count += elt_count;
4980 /* Examine CTOR to discover:
4981 * how many scalar fields are set to nonzero values,
4982 and place it in *P_NZ_ELTS;
4983 * how many scalar fields in total are in CTOR,
4984 and place it in *P_ELT_COUNT.
4985 * if a type is a union, and the initializer from the constructor
4986 is not the largest element in the union, then set *p_must_clear.
4988 Return whether or not CTOR is a valid static constant initializer, the same
4989 as "initializer_constant_valid_p (CTOR, TREE_TYPE (CTOR)) != 0". */
4992 categorize_ctor_elements (const_tree ctor, HOST_WIDE_INT *p_nz_elts,
4993 HOST_WIDE_INT *p_elt_count,
4998 *p_must_clear = false;
5001 categorize_ctor_elements_1 (ctor, p_nz_elts, p_elt_count, p_must_clear);
5004 /* Count the number of scalars in TYPE. Return -1 on overflow or
5005 variable-sized. If ALLOW_FLEXARR is true, don't count flexible
5006 array member at the end of the structure. */
5009 count_type_elements (const_tree type, bool allow_flexarr)
5011 const HOST_WIDE_INT max = ~((HOST_WIDE_INT)1 << (HOST_BITS_PER_WIDE_INT-1));
5012 switch (TREE_CODE (type))
5016 tree telts = array_type_nelts (type);
5017 if (telts && host_integerp (telts, 1))
5019 HOST_WIDE_INT n = tree_low_cst (telts, 1) + 1;
5020 HOST_WIDE_INT m = count_type_elements (TREE_TYPE (type), false);
5023 else if (max / n > m)
5031 HOST_WIDE_INT n = 0, t;
5034 for (f = TYPE_FIELDS (type); f ; f = TREE_CHAIN (f))
5035 if (TREE_CODE (f) == FIELD_DECL)
5037 t = count_type_elements (TREE_TYPE (f), false);
5040 /* Check for structures with flexible array member. */
5041 tree tf = TREE_TYPE (f);
5043 && TREE_CHAIN (f) == NULL
5044 && TREE_CODE (tf) == ARRAY_TYPE
5046 && TYPE_MIN_VALUE (TYPE_DOMAIN (tf))
5047 && integer_zerop (TYPE_MIN_VALUE (TYPE_DOMAIN (tf)))
5048 && !TYPE_MAX_VALUE (TYPE_DOMAIN (tf))
5049 && int_size_in_bytes (type) >= 0)
5061 case QUAL_UNION_TYPE:
5068 return TYPE_VECTOR_SUBPARTS (type);
5072 case FIXED_POINT_TYPE:
5077 case REFERENCE_TYPE:
5092 /* Return 1 if EXP contains mostly (3/4) zeros. */
5095 mostly_zeros_p (const_tree exp)
5097 if (TREE_CODE (exp) == CONSTRUCTOR)
5100 HOST_WIDE_INT nz_elts, count, elts;
5103 categorize_ctor_elements (exp, &nz_elts, &count, &must_clear);
5107 elts = count_type_elements (TREE_TYPE (exp), false);
5109 return nz_elts < elts / 4;
5112 return initializer_zerop (exp);
5115 /* Return 1 if EXP contains all zeros. */
5118 all_zeros_p (const_tree exp)
5120 if (TREE_CODE (exp) == CONSTRUCTOR)
5123 HOST_WIDE_INT nz_elts, count;
5126 categorize_ctor_elements (exp, &nz_elts, &count, &must_clear);
5127 return nz_elts == 0;
5130 return initializer_zerop (exp);
5133 /* Helper function for store_constructor.
5134 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
5135 TYPE is the type of the CONSTRUCTOR, not the element type.
5136 CLEARED is as for store_constructor.
5137 ALIAS_SET is the alias set to use for any stores.
5139 This provides a recursive shortcut back to store_constructor when it isn't
5140 necessary to go through store_field. This is so that we can pass through
5141 the cleared field to let store_constructor know that we may not have to
5142 clear a substructure if the outer structure has already been cleared. */
5145 store_constructor_field (rtx target, unsigned HOST_WIDE_INT bitsize,
5146 HOST_WIDE_INT bitpos, enum machine_mode mode,
5147 tree exp, tree type, int cleared,
5148 alias_set_type alias_set)
5150 if (TREE_CODE (exp) == CONSTRUCTOR
5151 /* We can only call store_constructor recursively if the size and
5152 bit position are on a byte boundary. */
5153 && bitpos % BITS_PER_UNIT == 0
5154 && (bitsize > 0 && bitsize % BITS_PER_UNIT == 0)
5155 /* If we have a nonzero bitpos for a register target, then we just
5156 let store_field do the bitfield handling. This is unlikely to
5157 generate unnecessary clear instructions anyways. */
5158 && (bitpos == 0 || MEM_P (target)))
5162 = adjust_address (target,
5163 GET_MODE (target) == BLKmode
5165 % GET_MODE_ALIGNMENT (GET_MODE (target)))
5166 ? BLKmode : VOIDmode, bitpos / BITS_PER_UNIT);
5169 /* Update the alias set, if required. */
5170 if (MEM_P (target) && ! MEM_KEEP_ALIAS_SET_P (target)
5171 && MEM_ALIAS_SET (target) != 0)
5173 target = copy_rtx (target);
5174 set_mem_alias_set (target, alias_set);
5177 store_constructor (exp, target, cleared, bitsize / BITS_PER_UNIT);
5180 store_field (target, bitsize, bitpos, mode, exp, type, alias_set, false);
5183 /* Store the value of constructor EXP into the rtx TARGET.
5184 TARGET is either a REG or a MEM; we know it cannot conflict, since
5185 safe_from_p has been called.
5186 CLEARED is true if TARGET is known to have been zero'd.
5187 SIZE is the number of bytes of TARGET we are allowed to modify: this
5188 may not be the same as the size of EXP if we are assigning to a field
5189 which has been packed to exclude padding bits. */
5192 store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size)
5194 tree type = TREE_TYPE (exp);
5195 #ifdef WORD_REGISTER_OPERATIONS
5196 HOST_WIDE_INT exp_size = int_size_in_bytes (type);
5199 switch (TREE_CODE (type))
5203 case QUAL_UNION_TYPE:
5205 unsigned HOST_WIDE_INT idx;
5208 /* If size is zero or the target is already cleared, do nothing. */
5209 if (size == 0 || cleared)
5211 /* We either clear the aggregate or indicate the value is dead. */
5212 else if ((TREE_CODE (type) == UNION_TYPE
5213 || TREE_CODE (type) == QUAL_UNION_TYPE)
5214 && ! CONSTRUCTOR_ELTS (exp))
5215 /* If the constructor is empty, clear the union. */
5217 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
5221 /* If we are building a static constructor into a register,
5222 set the initial value as zero so we can fold the value into
5223 a constant. But if more than one register is involved,
5224 this probably loses. */
5225 else if (REG_P (target) && TREE_STATIC (exp)
5226 && GET_MODE_SIZE (GET_MODE (target)) <= UNITS_PER_WORD)
5228 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5232 /* If the constructor has fewer fields than the structure or
5233 if we are initializing the structure to mostly zeros, clear
5234 the whole structure first. Don't do this if TARGET is a
5235 register whose mode size isn't equal to SIZE since
5236 clear_storage can't handle this case. */
5238 && (((int)VEC_length (constructor_elt, CONSTRUCTOR_ELTS (exp))
5239 != fields_length (type))
5240 || mostly_zeros_p (exp))
5242 || ((HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (target))
5245 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5249 if (REG_P (target) && !cleared)
5250 emit_clobber (target);
5252 /* Store each element of the constructor into the
5253 corresponding field of TARGET. */
5254 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, field, value)
5256 enum machine_mode mode;
5257 HOST_WIDE_INT bitsize;
5258 HOST_WIDE_INT bitpos = 0;
5260 rtx to_rtx = target;
5262 /* Just ignore missing fields. We cleared the whole
5263 structure, above, if any fields are missing. */
5267 if (cleared && initializer_zerop (value))
5270 if (host_integerp (DECL_SIZE (field), 1))
5271 bitsize = tree_low_cst (DECL_SIZE (field), 1);
5275 mode = DECL_MODE (field);
5276 if (DECL_BIT_FIELD (field))
5279 offset = DECL_FIELD_OFFSET (field);
5280 if (host_integerp (offset, 0)
5281 && host_integerp (bit_position (field), 0))
5283 bitpos = int_bit_position (field);
5287 bitpos = tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 0);
5291 enum machine_mode address_mode;
5295 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (offset,
5296 make_tree (TREE_TYPE (exp),
5299 offset_rtx = expand_normal (offset);
5300 gcc_assert (MEM_P (to_rtx));
5303 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (to_rtx));
5304 if (GET_MODE (offset_rtx) != address_mode)
5305 offset_rtx = convert_to_mode (address_mode, offset_rtx, 0);
5307 to_rtx = offset_address (to_rtx, offset_rtx,
5308 highest_pow2_factor (offset));
5311 #ifdef WORD_REGISTER_OPERATIONS
5312 /* If this initializes a field that is smaller than a
5313 word, at the start of a word, try to widen it to a full
5314 word. This special case allows us to output C++ member
5315 function initializations in a form that the optimizers
5318 && bitsize < BITS_PER_WORD
5319 && bitpos % BITS_PER_WORD == 0
5320 && GET_MODE_CLASS (mode) == MODE_INT
5321 && TREE_CODE (value) == INTEGER_CST
5323 && bitpos + BITS_PER_WORD <= exp_size * BITS_PER_UNIT)
5325 tree type = TREE_TYPE (value);
5327 if (TYPE_PRECISION (type) < BITS_PER_WORD)
5329 type = lang_hooks.types.type_for_size
5330 (BITS_PER_WORD, TYPE_UNSIGNED (type));
5331 value = fold_convert (type, value);
5334 if (BYTES_BIG_ENDIAN)
5336 = fold_build2 (LSHIFT_EXPR, type, value,
5337 build_int_cst (type,
5338 BITS_PER_WORD - bitsize));
5339 bitsize = BITS_PER_WORD;
5344 if (MEM_P (to_rtx) && !MEM_KEEP_ALIAS_SET_P (to_rtx)
5345 && DECL_NONADDRESSABLE_P (field))
5347 to_rtx = copy_rtx (to_rtx);
5348 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
5351 store_constructor_field (to_rtx, bitsize, bitpos, mode,
5352 value, type, cleared,
5353 get_alias_set (TREE_TYPE (field)));
5360 unsigned HOST_WIDE_INT i;
5363 tree elttype = TREE_TYPE (type);
5365 HOST_WIDE_INT minelt = 0;
5366 HOST_WIDE_INT maxelt = 0;
5368 domain = TYPE_DOMAIN (type);
5369 const_bounds_p = (TYPE_MIN_VALUE (domain)
5370 && TYPE_MAX_VALUE (domain)
5371 && host_integerp (TYPE_MIN_VALUE (domain), 0)
5372 && host_integerp (TYPE_MAX_VALUE (domain), 0));
5374 /* If we have constant bounds for the range of the type, get them. */
5377 minelt = tree_low_cst (TYPE_MIN_VALUE (domain), 0);
5378 maxelt = tree_low_cst (TYPE_MAX_VALUE (domain), 0);
5381 /* If the constructor has fewer elements than the array, clear
5382 the whole array first. Similarly if this is static
5383 constructor of a non-BLKmode object. */
5386 else if (REG_P (target) && TREE_STATIC (exp))
5390 unsigned HOST_WIDE_INT idx;
5392 HOST_WIDE_INT count = 0, zero_count = 0;
5393 need_to_clear = ! const_bounds_p;
5395 /* This loop is a more accurate version of the loop in
5396 mostly_zeros_p (it handles RANGE_EXPR in an index). It
5397 is also needed to check for missing elements. */
5398 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, index, value)
5400 HOST_WIDE_INT this_node_count;
5405 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5407 tree lo_index = TREE_OPERAND (index, 0);
5408 tree hi_index = TREE_OPERAND (index, 1);
5410 if (! host_integerp (lo_index, 1)
5411 || ! host_integerp (hi_index, 1))
5417 this_node_count = (tree_low_cst (hi_index, 1)
5418 - tree_low_cst (lo_index, 1) + 1);
5421 this_node_count = 1;
5423 count += this_node_count;
5424 if (mostly_zeros_p (value))
5425 zero_count += this_node_count;
5428 /* Clear the entire array first if there are any missing
5429 elements, or if the incidence of zero elements is >=
5432 && (count < maxelt - minelt + 1
5433 || 4 * zero_count >= 3 * count))
5437 if (need_to_clear && size > 0)
5440 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5442 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5446 if (!cleared && REG_P (target))
5447 /* Inform later passes that the old value is dead. */
5448 emit_clobber (target);
5450 /* Store each element of the constructor into the
5451 corresponding element of TARGET, determined by counting the
5453 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), i, index, value)
5455 enum machine_mode mode;
5456 HOST_WIDE_INT bitsize;
5457 HOST_WIDE_INT bitpos;
5458 rtx xtarget = target;
5460 if (cleared && initializer_zerop (value))
5463 mode = TYPE_MODE (elttype);
5464 if (mode == BLKmode)
5465 bitsize = (host_integerp (TYPE_SIZE (elttype), 1)
5466 ? tree_low_cst (TYPE_SIZE (elttype), 1)
5469 bitsize = GET_MODE_BITSIZE (mode);
5471 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5473 tree lo_index = TREE_OPERAND (index, 0);
5474 tree hi_index = TREE_OPERAND (index, 1);
5475 rtx index_r, pos_rtx;
5476 HOST_WIDE_INT lo, hi, count;
5479 /* If the range is constant and "small", unroll the loop. */
5481 && host_integerp (lo_index, 0)
5482 && host_integerp (hi_index, 0)
5483 && (lo = tree_low_cst (lo_index, 0),
5484 hi = tree_low_cst (hi_index, 0),
5485 count = hi - lo + 1,
5488 || (host_integerp (TYPE_SIZE (elttype), 1)
5489 && (tree_low_cst (TYPE_SIZE (elttype), 1) * count
5492 lo -= minelt; hi -= minelt;
5493 for (; lo <= hi; lo++)
5495 bitpos = lo * tree_low_cst (TYPE_SIZE (elttype), 0);
5498 && !MEM_KEEP_ALIAS_SET_P (target)
5499 && TREE_CODE (type) == ARRAY_TYPE
5500 && TYPE_NONALIASED_COMPONENT (type))
5502 target = copy_rtx (target);
5503 MEM_KEEP_ALIAS_SET_P (target) = 1;
5506 store_constructor_field
5507 (target, bitsize, bitpos, mode, value, type, cleared,
5508 get_alias_set (elttype));
5513 rtx loop_start = gen_label_rtx ();
5514 rtx loop_end = gen_label_rtx ();
5517 expand_normal (hi_index);
5519 index = build_decl (EXPR_LOCATION (exp),
5520 VAR_DECL, NULL_TREE, domain);
5521 index_r = gen_reg_rtx (promote_decl_mode (index, NULL));
5522 SET_DECL_RTL (index, index_r);
5523 store_expr (lo_index, index_r, 0, false);
5525 /* Build the head of the loop. */
5526 do_pending_stack_adjust ();
5527 emit_label (loop_start);
5529 /* Assign value to element index. */
5531 fold_convert (ssizetype,
5532 fold_build2 (MINUS_EXPR,
5535 TYPE_MIN_VALUE (domain)));
5538 size_binop (MULT_EXPR, position,
5539 fold_convert (ssizetype,
5540 TYPE_SIZE_UNIT (elttype)));
5542 pos_rtx = expand_normal (position);
5543 xtarget = offset_address (target, pos_rtx,
5544 highest_pow2_factor (position));
5545 xtarget = adjust_address (xtarget, mode, 0);
5546 if (TREE_CODE (value) == CONSTRUCTOR)
5547 store_constructor (value, xtarget, cleared,
5548 bitsize / BITS_PER_UNIT);
5550 store_expr (value, xtarget, 0, false);
5552 /* Generate a conditional jump to exit the loop. */
5553 exit_cond = build2 (LT_EXPR, integer_type_node,
5555 jumpif (exit_cond, loop_end, -1);
5557 /* Update the loop counter, and jump to the head of
5559 expand_assignment (index,
5560 build2 (PLUS_EXPR, TREE_TYPE (index),
5561 index, integer_one_node),
5564 emit_jump (loop_start);
5566 /* Build the end of the loop. */
5567 emit_label (loop_end);
5570 else if ((index != 0 && ! host_integerp (index, 0))
5571 || ! host_integerp (TYPE_SIZE (elttype), 1))
5576 index = ssize_int (1);
5579 index = fold_convert (ssizetype,
5580 fold_build2 (MINUS_EXPR,
5583 TYPE_MIN_VALUE (domain)));
5586 size_binop (MULT_EXPR, index,
5587 fold_convert (ssizetype,
5588 TYPE_SIZE_UNIT (elttype)));
5589 xtarget = offset_address (target,
5590 expand_normal (position),
5591 highest_pow2_factor (position));
5592 xtarget = adjust_address (xtarget, mode, 0);
5593 store_expr (value, xtarget, 0, false);
5598 bitpos = ((tree_low_cst (index, 0) - minelt)
5599 * tree_low_cst (TYPE_SIZE (elttype), 1));
5601 bitpos = (i * tree_low_cst (TYPE_SIZE (elttype), 1));
5603 if (MEM_P (target) && !MEM_KEEP_ALIAS_SET_P (target)
5604 && TREE_CODE (type) == ARRAY_TYPE
5605 && TYPE_NONALIASED_COMPONENT (type))
5607 target = copy_rtx (target);
5608 MEM_KEEP_ALIAS_SET_P (target) = 1;
5610 store_constructor_field (target, bitsize, bitpos, mode, value,
5611 type, cleared, get_alias_set (elttype));
5619 unsigned HOST_WIDE_INT idx;
5620 constructor_elt *ce;
5624 tree elttype = TREE_TYPE (type);
5625 int elt_size = tree_low_cst (TYPE_SIZE (elttype), 1);
5626 enum machine_mode eltmode = TYPE_MODE (elttype);
5627 HOST_WIDE_INT bitsize;
5628 HOST_WIDE_INT bitpos;
5629 rtvec vector = NULL;
5631 alias_set_type alias;
5633 gcc_assert (eltmode != BLKmode);
5635 n_elts = TYPE_VECTOR_SUBPARTS (type);
5636 if (REG_P (target) && VECTOR_MODE_P (GET_MODE (target)))
5638 enum machine_mode mode = GET_MODE (target);
5640 icode = (int) optab_handler (vec_init_optab, mode)->insn_code;
5641 if (icode != CODE_FOR_nothing)
5645 vector = rtvec_alloc (n_elts);
5646 for (i = 0; i < n_elts; i++)
5647 RTVEC_ELT (vector, i) = CONST0_RTX (GET_MODE_INNER (mode));
5651 /* If the constructor has fewer elements than the vector,
5652 clear the whole array first. Similarly if this is static
5653 constructor of a non-BLKmode object. */
5656 else if (REG_P (target) && TREE_STATIC (exp))
5660 unsigned HOST_WIDE_INT count = 0, zero_count = 0;
5663 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
5665 int n_elts_here = tree_low_cst
5666 (int_const_binop (TRUNC_DIV_EXPR,
5667 TYPE_SIZE (TREE_TYPE (value)),
5668 TYPE_SIZE (elttype), 0), 1);
5670 count += n_elts_here;
5671 if (mostly_zeros_p (value))
5672 zero_count += n_elts_here;
5675 /* Clear the entire vector first if there are any missing elements,
5676 or if the incidence of zero elements is >= 75%. */
5677 need_to_clear = (count < n_elts || 4 * zero_count >= 3 * count);
5680 if (need_to_clear && size > 0 && !vector)
5683 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5685 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5689 /* Inform later passes that the old value is dead. */
5690 if (!cleared && !vector && REG_P (target))
5691 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5694 alias = MEM_ALIAS_SET (target);
5696 alias = get_alias_set (elttype);
5698 /* Store each element of the constructor into the corresponding
5699 element of TARGET, determined by counting the elements. */
5700 for (idx = 0, i = 0;
5701 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
5702 idx++, i += bitsize / elt_size)
5704 HOST_WIDE_INT eltpos;
5705 tree value = ce->value;
5707 bitsize = tree_low_cst (TYPE_SIZE (TREE_TYPE (value)), 1);
5708 if (cleared && initializer_zerop (value))
5712 eltpos = tree_low_cst (ce->index, 1);
5718 /* Vector CONSTRUCTORs should only be built from smaller
5719 vectors in the case of BLKmode vectors. */
5720 gcc_assert (TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE);
5721 RTVEC_ELT (vector, eltpos)
5722 = expand_normal (value);
5726 enum machine_mode value_mode =
5727 TREE_CODE (TREE_TYPE (value)) == VECTOR_TYPE
5728 ? TYPE_MODE (TREE_TYPE (value))
5730 bitpos = eltpos * elt_size;
5731 store_constructor_field (target, bitsize, bitpos,
5732 value_mode, value, type,
5738 emit_insn (GEN_FCN (icode)
5740 gen_rtx_PARALLEL (GET_MODE (target), vector)));
5749 /* Store the value of EXP (an expression tree)
5750 into a subfield of TARGET which has mode MODE and occupies
5751 BITSIZE bits, starting BITPOS bits from the start of TARGET.
5752 If MODE is VOIDmode, it means that we are storing into a bit-field.
5754 Always return const0_rtx unless we have something particular to
5757 TYPE is the type of the underlying object,
5759 ALIAS_SET is the alias set for the destination. This value will
5760 (in general) be different from that for TARGET, since TARGET is a
5761 reference to the containing structure.
5763 If NONTEMPORAL is true, try generating a nontemporal store. */
5766 store_field (rtx target, HOST_WIDE_INT bitsize, HOST_WIDE_INT bitpos,
5767 enum machine_mode mode, tree exp, tree type,
5768 alias_set_type alias_set, bool nontemporal)
5770 if (TREE_CODE (exp) == ERROR_MARK)
5773 /* If we have nothing to store, do nothing unless the expression has
5776 return expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL);
5778 /* If we are storing into an unaligned field of an aligned union that is
5779 in a register, we may have the mode of TARGET being an integer mode but
5780 MODE == BLKmode. In that case, get an aligned object whose size and
5781 alignment are the same as TARGET and store TARGET into it (we can avoid
5782 the store if the field being stored is the entire width of TARGET). Then
5783 call ourselves recursively to store the field into a BLKmode version of
5784 that object. Finally, load from the object into TARGET. This is not
5785 very efficient in general, but should only be slightly more expensive
5786 than the otherwise-required unaligned accesses. Perhaps this can be
5787 cleaned up later. It's tempting to make OBJECT readonly, but it's set
5788 twice, once with emit_move_insn and once via store_field. */
5791 && (REG_P (target) || GET_CODE (target) == SUBREG))
5793 rtx object = assign_temp (type, 0, 1, 1);
5794 rtx blk_object = adjust_address (object, BLKmode, 0);
5796 if (bitsize != (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (target)))
5797 emit_move_insn (object, target);
5799 store_field (blk_object, bitsize, bitpos, mode, exp, type, alias_set,
5802 emit_move_insn (target, object);
5804 /* We want to return the BLKmode version of the data. */
5808 if (GET_CODE (target) == CONCAT)
5810 /* We're storing into a struct containing a single __complex. */
5812 gcc_assert (!bitpos);
5813 return store_expr (exp, target, 0, nontemporal);
5816 /* If the structure is in a register or if the component
5817 is a bit field, we cannot use addressing to access it.
5818 Use bit-field techniques or SUBREG to store in it. */
5820 if (mode == VOIDmode
5821 || (mode != BLKmode && ! direct_store[(int) mode]
5822 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
5823 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
5825 || GET_CODE (target) == SUBREG
5826 /* If the field isn't aligned enough to store as an ordinary memref,
5827 store it as a bit field. */
5829 && ((((MEM_ALIGN (target) < GET_MODE_ALIGNMENT (mode))
5830 || bitpos % GET_MODE_ALIGNMENT (mode))
5831 && SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (target)))
5832 || (bitpos % BITS_PER_UNIT != 0)))
5833 /* If the RHS and field are a constant size and the size of the
5834 RHS isn't the same size as the bitfield, we must use bitfield
5837 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
5838 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) != 0))
5843 /* If EXP is a NOP_EXPR of precision less than its mode, then that
5844 implies a mask operation. If the precision is the same size as
5845 the field we're storing into, that mask is redundant. This is
5846 particularly common with bit field assignments generated by the
5848 nop_def = get_def_for_expr (exp, NOP_EXPR);
5851 tree type = TREE_TYPE (exp);
5852 if (INTEGRAL_TYPE_P (type)
5853 && TYPE_PRECISION (type) < GET_MODE_BITSIZE (TYPE_MODE (type))
5854 && bitsize == TYPE_PRECISION (type))
5856 tree op = gimple_assign_rhs1 (nop_def);
5857 type = TREE_TYPE (op);
5858 if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) >= bitsize)
5863 temp = expand_normal (exp);
5865 /* If BITSIZE is narrower than the size of the type of EXP
5866 we will be narrowing TEMP. Normally, what's wanted are the
5867 low-order bits. However, if EXP's type is a record and this is
5868 big-endian machine, we want the upper BITSIZE bits. */
5869 if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
5870 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (temp))
5871 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
5872 temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
5873 size_int (GET_MODE_BITSIZE (GET_MODE (temp))
5877 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
5879 if (mode != VOIDmode && mode != BLKmode
5880 && mode != TYPE_MODE (TREE_TYPE (exp)))
5881 temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1);
5883 /* If the modes of TEMP and TARGET are both BLKmode, both
5884 must be in memory and BITPOS must be aligned on a byte
5885 boundary. If so, we simply do a block copy. Likewise
5886 for a BLKmode-like TARGET. */
5887 if (GET_MODE (temp) == BLKmode
5888 && (GET_MODE (target) == BLKmode
5890 && GET_MODE_CLASS (GET_MODE (target)) == MODE_INT
5891 && (bitpos % BITS_PER_UNIT) == 0
5892 && (bitsize % BITS_PER_UNIT) == 0)))
5894 gcc_assert (MEM_P (target) && MEM_P (temp)
5895 && (bitpos % BITS_PER_UNIT) == 0);
5897 target = adjust_address (target, VOIDmode, bitpos / BITS_PER_UNIT);
5898 emit_block_move (target, temp,
5899 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
5906 /* Store the value in the bitfield. */
5907 store_bit_field (target, bitsize, bitpos, mode, temp);
5913 /* Now build a reference to just the desired component. */
5914 rtx to_rtx = adjust_address (target, mode, bitpos / BITS_PER_UNIT);
5916 if (to_rtx == target)
5917 to_rtx = copy_rtx (to_rtx);
5919 MEM_SET_IN_STRUCT_P (to_rtx, 1);
5920 if (!MEM_KEEP_ALIAS_SET_P (to_rtx) && MEM_ALIAS_SET (to_rtx) != 0)
5921 set_mem_alias_set (to_rtx, alias_set);
5923 return store_expr (exp, to_rtx, 0, nontemporal);
5927 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
5928 an ARRAY_REF, or an ARRAY_RANGE_REF, look for nested operations of these
5929 codes and find the ultimate containing object, which we return.
5931 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
5932 bit position, and *PUNSIGNEDP to the signedness of the field.
5933 If the position of the field is variable, we store a tree
5934 giving the variable offset (in units) in *POFFSET.
5935 This offset is in addition to the bit position.
5936 If the position is not variable, we store 0 in *POFFSET.
5938 If any of the extraction expressions is volatile,
5939 we store 1 in *PVOLATILEP. Otherwise we don't change that.
5941 If the field is a non-BLKmode bit-field, *PMODE is set to VOIDmode.
5942 Otherwise, it is a mode that can be used to access the field.
5944 If the field describes a variable-sized object, *PMODE is set to
5945 BLKmode and *PBITSIZE is set to -1. An access cannot be made in
5946 this case, but the address of the object can be found.
5948 If KEEP_ALIGNING is true and the target is STRICT_ALIGNMENT, we don't
5949 look through nodes that serve as markers of a greater alignment than
5950 the one that can be deduced from the expression. These nodes make it
5951 possible for front-ends to prevent temporaries from being created by
5952 the middle-end on alignment considerations. For that purpose, the
5953 normal operating mode at high-level is to always pass FALSE so that
5954 the ultimate containing object is really returned; moreover, the
5955 associated predicate handled_component_p will always return TRUE
5956 on these nodes, thus indicating that they are essentially handled
5957 by get_inner_reference. TRUE should only be passed when the caller
5958 is scanning the expression in order to build another representation
5959 and specifically knows how to handle these nodes; as such, this is
5960 the normal operating mode in the RTL expanders. */
5963 get_inner_reference (tree exp, HOST_WIDE_INT *pbitsize,
5964 HOST_WIDE_INT *pbitpos, tree *poffset,
5965 enum machine_mode *pmode, int *punsignedp,
5966 int *pvolatilep, bool keep_aligning)
5969 enum machine_mode mode = VOIDmode;
5970 bool blkmode_bitfield = false;
5971 tree offset = size_zero_node;
5972 tree bit_offset = bitsize_zero_node;
5974 /* First get the mode, signedness, and size. We do this from just the
5975 outermost expression. */
5977 if (TREE_CODE (exp) == COMPONENT_REF)
5979 tree field = TREE_OPERAND (exp, 1);
5980 size_tree = DECL_SIZE (field);
5981 if (!DECL_BIT_FIELD (field))
5982 mode = DECL_MODE (field);
5983 else if (DECL_MODE (field) == BLKmode)
5984 blkmode_bitfield = true;
5986 *punsignedp = DECL_UNSIGNED (field);
5988 else if (TREE_CODE (exp) == BIT_FIELD_REF)
5990 size_tree = TREE_OPERAND (exp, 1);
5991 *punsignedp = (! INTEGRAL_TYPE_P (TREE_TYPE (exp))
5992 || TYPE_UNSIGNED (TREE_TYPE (exp)));
5994 /* For vector types, with the correct size of access, use the mode of
5996 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == VECTOR_TYPE
5997 && TREE_TYPE (exp) == TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))
5998 && tree_int_cst_equal (size_tree, TYPE_SIZE (TREE_TYPE (exp))))
5999 mode = TYPE_MODE (TREE_TYPE (exp));
6003 mode = TYPE_MODE (TREE_TYPE (exp));
6004 *punsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
6006 if (mode == BLKmode)
6007 size_tree = TYPE_SIZE (TREE_TYPE (exp));
6009 *pbitsize = GET_MODE_BITSIZE (mode);
6014 if (! host_integerp (size_tree, 1))
6015 mode = BLKmode, *pbitsize = -1;
6017 *pbitsize = tree_low_cst (size_tree, 1);
6020 /* Compute cumulative bit-offset for nested component-refs and array-refs,
6021 and find the ultimate containing object. */
6024 switch (TREE_CODE (exp))
6027 bit_offset = size_binop (PLUS_EXPR, bit_offset,
6028 TREE_OPERAND (exp, 2));
6033 tree field = TREE_OPERAND (exp, 1);
6034 tree this_offset = component_ref_field_offset (exp);
6036 /* If this field hasn't been filled in yet, don't go past it.
6037 This should only happen when folding expressions made during
6038 type construction. */
6039 if (this_offset == 0)
6042 offset = size_binop (PLUS_EXPR, offset, this_offset);
6043 bit_offset = size_binop (PLUS_EXPR, bit_offset,
6044 DECL_FIELD_BIT_OFFSET (field));
6046 /* ??? Right now we don't do anything with DECL_OFFSET_ALIGN. */
6051 case ARRAY_RANGE_REF:
6053 tree index = TREE_OPERAND (exp, 1);
6054 tree low_bound = array_ref_low_bound (exp);
6055 tree unit_size = array_ref_element_size (exp);
6057 /* We assume all arrays have sizes that are a multiple of a byte.
6058 First subtract the lower bound, if any, in the type of the
6059 index, then convert to sizetype and multiply by the size of
6060 the array element. */
6061 if (! integer_zerop (low_bound))
6062 index = fold_build2 (MINUS_EXPR, TREE_TYPE (index),
6065 offset = size_binop (PLUS_EXPR, offset,
6066 size_binop (MULT_EXPR,
6067 fold_convert (sizetype, index),
6076 bit_offset = size_binop (PLUS_EXPR, bit_offset,
6077 bitsize_int (*pbitsize));
6080 case VIEW_CONVERT_EXPR:
6081 if (keep_aligning && STRICT_ALIGNMENT
6082 && (TYPE_ALIGN (TREE_TYPE (exp))
6083 > TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0))))
6084 && (TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0)))
6085 < BIGGEST_ALIGNMENT)
6086 && (TYPE_ALIGN_OK (TREE_TYPE (exp))
6087 || TYPE_ALIGN_OK (TREE_TYPE (TREE_OPERAND (exp, 0)))))
6095 /* If any reference in the chain is volatile, the effect is volatile. */
6096 if (TREE_THIS_VOLATILE (exp))
6099 exp = TREE_OPERAND (exp, 0);
6103 /* If OFFSET is constant, see if we can return the whole thing as a
6104 constant bit position. Make sure to handle overflow during
6106 if (host_integerp (offset, 0))
6108 double_int tem = double_int_mul (tree_to_double_int (offset),
6109 uhwi_to_double_int (BITS_PER_UNIT));
6110 tem = double_int_add (tem, tree_to_double_int (bit_offset));
6111 if (double_int_fits_in_shwi_p (tem))
6113 *pbitpos = double_int_to_shwi (tem);
6114 *poffset = offset = NULL_TREE;
6118 /* Otherwise, split it up. */
6121 *pbitpos = tree_low_cst (bit_offset, 0);
6125 /* We can use BLKmode for a byte-aligned BLKmode bitfield. */
6126 if (mode == VOIDmode
6128 && (*pbitpos % BITS_PER_UNIT) == 0
6129 && (*pbitsize % BITS_PER_UNIT) == 0)
6137 /* Given an expression EXP that may be a COMPONENT_REF, an ARRAY_REF or an
6138 ARRAY_RANGE_REF, look for whether EXP or any nested component-refs within
6139 EXP is marked as PACKED. */
6142 contains_packed_reference (const_tree exp)
6144 bool packed_p = false;
6148 switch (TREE_CODE (exp))
6152 tree field = TREE_OPERAND (exp, 1);
6153 packed_p = DECL_PACKED (field)
6154 || TYPE_PACKED (TREE_TYPE (field))
6155 || TYPE_PACKED (TREE_TYPE (exp));
6163 case ARRAY_RANGE_REF:
6166 case VIEW_CONVERT_EXPR:
6172 exp = TREE_OPERAND (exp, 0);
6178 /* Return a tree of sizetype representing the size, in bytes, of the element
6179 of EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6182 array_ref_element_size (tree exp)
6184 tree aligned_size = TREE_OPERAND (exp, 3);
6185 tree elmt_type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)));
6186 location_t loc = EXPR_LOCATION (exp);
6188 /* If a size was specified in the ARRAY_REF, it's the size measured
6189 in alignment units of the element type. So multiply by that value. */
6192 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6193 sizetype from another type of the same width and signedness. */
6194 if (TREE_TYPE (aligned_size) != sizetype)
6195 aligned_size = fold_convert_loc (loc, sizetype, aligned_size);
6196 return size_binop_loc (loc, MULT_EXPR, aligned_size,
6197 size_int (TYPE_ALIGN_UNIT (elmt_type)));
6200 /* Otherwise, take the size from that of the element type. Substitute
6201 any PLACEHOLDER_EXPR that we have. */
6203 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (elmt_type), exp);
6206 /* Return a tree representing the lower bound of the array mentioned in
6207 EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6210 array_ref_low_bound (tree exp)
6212 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
6214 /* If a lower bound is specified in EXP, use it. */
6215 if (TREE_OPERAND (exp, 2))
6216 return TREE_OPERAND (exp, 2);
6218 /* Otherwise, if there is a domain type and it has a lower bound, use it,
6219 substituting for a PLACEHOLDER_EXPR as needed. */
6220 if (domain_type && TYPE_MIN_VALUE (domain_type))
6221 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MIN_VALUE (domain_type), exp);
6223 /* Otherwise, return a zero of the appropriate type. */
6224 return build_int_cst (TREE_TYPE (TREE_OPERAND (exp, 1)), 0);
6227 /* Return a tree representing the upper bound of the array mentioned in
6228 EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
6231 array_ref_up_bound (tree exp)
6233 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
6235 /* If there is a domain type and it has an upper bound, use it, substituting
6236 for a PLACEHOLDER_EXPR as needed. */
6237 if (domain_type && TYPE_MAX_VALUE (domain_type))
6238 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MAX_VALUE (domain_type), exp);
6240 /* Otherwise fail. */
6244 /* Return a tree representing the offset, in bytes, of the field referenced
6245 by EXP. This does not include any offset in DECL_FIELD_BIT_OFFSET. */
6248 component_ref_field_offset (tree exp)
6250 tree aligned_offset = TREE_OPERAND (exp, 2);
6251 tree field = TREE_OPERAND (exp, 1);
6252 location_t loc = EXPR_LOCATION (exp);
6254 /* If an offset was specified in the COMPONENT_REF, it's the offset measured
6255 in units of DECL_OFFSET_ALIGN / BITS_PER_UNIT. So multiply by that
6259 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6260 sizetype from another type of the same width and signedness. */
6261 if (TREE_TYPE (aligned_offset) != sizetype)
6262 aligned_offset = fold_convert_loc (loc, sizetype, aligned_offset);
6263 return size_binop_loc (loc, MULT_EXPR, aligned_offset,
6264 size_int (DECL_OFFSET_ALIGN (field)
6268 /* Otherwise, take the offset from that of the field. Substitute
6269 any PLACEHOLDER_EXPR that we have. */
6271 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_FIELD_OFFSET (field), exp);
6274 /* Alignment in bits the TARGET of an assignment may be assumed to have. */
6276 static unsigned HOST_WIDE_INT
6277 target_align (const_tree target)
6279 /* We might have a chain of nested references with intermediate misaligning
6280 bitfields components, so need to recurse to find out. */
6282 unsigned HOST_WIDE_INT this_align, outer_align;
6284 switch (TREE_CODE (target))
6290 this_align = DECL_ALIGN (TREE_OPERAND (target, 1));
6291 outer_align = target_align (TREE_OPERAND (target, 0));
6292 return MIN (this_align, outer_align);
6295 case ARRAY_RANGE_REF:
6296 this_align = TYPE_ALIGN (TREE_TYPE (target));
6297 outer_align = target_align (TREE_OPERAND (target, 0));
6298 return MIN (this_align, outer_align);
6301 case NON_LVALUE_EXPR:
6302 case VIEW_CONVERT_EXPR:
6303 this_align = TYPE_ALIGN (TREE_TYPE (target));
6304 outer_align = target_align (TREE_OPERAND (target, 0));
6305 return MAX (this_align, outer_align);
6308 return TYPE_ALIGN (TREE_TYPE (target));
6313 /* Given an rtx VALUE that may contain additions and multiplications, return
6314 an equivalent value that just refers to a register, memory, or constant.
6315 This is done by generating instructions to perform the arithmetic and
6316 returning a pseudo-register containing the value.
6318 The returned value may be a REG, SUBREG, MEM or constant. */
6321 force_operand (rtx value, rtx target)
6324 /* Use subtarget as the target for operand 0 of a binary operation. */
6325 rtx subtarget = get_subtarget (target);
6326 enum rtx_code code = GET_CODE (value);
6328 /* Check for subreg applied to an expression produced by loop optimizer. */
6330 && !REG_P (SUBREG_REG (value))
6331 && !MEM_P (SUBREG_REG (value)))
6334 = simplify_gen_subreg (GET_MODE (value),
6335 force_reg (GET_MODE (SUBREG_REG (value)),
6336 force_operand (SUBREG_REG (value),
6338 GET_MODE (SUBREG_REG (value)),
6339 SUBREG_BYTE (value));
6340 code = GET_CODE (value);
6343 /* Check for a PIC address load. */
6344 if ((code == PLUS || code == MINUS)
6345 && XEXP (value, 0) == pic_offset_table_rtx
6346 && (GET_CODE (XEXP (value, 1)) == SYMBOL_REF
6347 || GET_CODE (XEXP (value, 1)) == LABEL_REF
6348 || GET_CODE (XEXP (value, 1)) == CONST))
6351 subtarget = gen_reg_rtx (GET_MODE (value));
6352 emit_move_insn (subtarget, value);
6356 if (ARITHMETIC_P (value))
6358 op2 = XEXP (value, 1);
6359 if (!CONSTANT_P (op2) && !(REG_P (op2) && op2 != subtarget))
6361 if (code == MINUS && CONST_INT_P (op2))
6364 op2 = negate_rtx (GET_MODE (value), op2);
6367 /* Check for an addition with OP2 a constant integer and our first
6368 operand a PLUS of a virtual register and something else. In that
6369 case, we want to emit the sum of the virtual register and the
6370 constant first and then add the other value. This allows virtual
6371 register instantiation to simply modify the constant rather than
6372 creating another one around this addition. */
6373 if (code == PLUS && CONST_INT_P (op2)
6374 && GET_CODE (XEXP (value, 0)) == PLUS
6375 && REG_P (XEXP (XEXP (value, 0), 0))
6376 && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
6377 && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
6379 rtx temp = expand_simple_binop (GET_MODE (value), code,
6380 XEXP (XEXP (value, 0), 0), op2,
6381 subtarget, 0, OPTAB_LIB_WIDEN);
6382 return expand_simple_binop (GET_MODE (value), code, temp,
6383 force_operand (XEXP (XEXP (value,
6385 target, 0, OPTAB_LIB_WIDEN);
6388 op1 = force_operand (XEXP (value, 0), subtarget);
6389 op2 = force_operand (op2, NULL_RTX);
6393 return expand_mult (GET_MODE (value), op1, op2, target, 1);
6395 if (!INTEGRAL_MODE_P (GET_MODE (value)))
6396 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6397 target, 1, OPTAB_LIB_WIDEN);
6399 return expand_divmod (0,
6400 FLOAT_MODE_P (GET_MODE (value))
6401 ? RDIV_EXPR : TRUNC_DIV_EXPR,
6402 GET_MODE (value), op1, op2, target, 0);
6404 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
6407 return expand_divmod (0, TRUNC_DIV_EXPR, GET_MODE (value), op1, op2,
6410 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
6413 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6414 target, 0, OPTAB_LIB_WIDEN);
6416 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6417 target, 1, OPTAB_LIB_WIDEN);
6420 if (UNARY_P (value))
6423 target = gen_reg_rtx (GET_MODE (value));
6424 op1 = force_operand (XEXP (value, 0), NULL_RTX);
6431 case FLOAT_TRUNCATE:
6432 convert_move (target, op1, code == ZERO_EXTEND);
6437 expand_fix (target, op1, code == UNSIGNED_FIX);
6441 case UNSIGNED_FLOAT:
6442 expand_float (target, op1, code == UNSIGNED_FLOAT);
6446 return expand_simple_unop (GET_MODE (value), code, op1, target, 0);
6450 #ifdef INSN_SCHEDULING
6451 /* On machines that have insn scheduling, we want all memory reference to be
6452 explicit, so we need to deal with such paradoxical SUBREGs. */
6453 if (GET_CODE (value) == SUBREG && MEM_P (SUBREG_REG (value))
6454 && (GET_MODE_SIZE (GET_MODE (value))
6455 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (value)))))
6457 = simplify_gen_subreg (GET_MODE (value),
6458 force_reg (GET_MODE (SUBREG_REG (value)),
6459 force_operand (SUBREG_REG (value),
6461 GET_MODE (SUBREG_REG (value)),
6462 SUBREG_BYTE (value));
6468 /* Subroutine of expand_expr: return nonzero iff there is no way that
6469 EXP can reference X, which is being modified. TOP_P is nonzero if this
6470 call is going to be used to determine whether we need a temporary
6471 for EXP, as opposed to a recursive call to this function.
6473 It is always safe for this routine to return zero since it merely
6474 searches for optimization opportunities. */
6477 safe_from_p (const_rtx x, tree exp, int top_p)
6483 /* If EXP has varying size, we MUST use a target since we currently
6484 have no way of allocating temporaries of variable size
6485 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
6486 So we assume here that something at a higher level has prevented a
6487 clash. This is somewhat bogus, but the best we can do. Only
6488 do this when X is BLKmode and when we are at the top level. */
6489 || (top_p && TREE_TYPE (exp) != 0 && COMPLETE_TYPE_P (TREE_TYPE (exp))
6490 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
6491 && (TREE_CODE (TREE_TYPE (exp)) != ARRAY_TYPE
6492 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)) == NULL_TREE
6493 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)))
6495 && GET_MODE (x) == BLKmode)
6496 /* If X is in the outgoing argument area, it is always safe. */
6498 && (XEXP (x, 0) == virtual_outgoing_args_rtx
6499 || (GET_CODE (XEXP (x, 0)) == PLUS
6500 && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx))))
6503 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
6504 find the underlying pseudo. */
6505 if (GET_CODE (x) == SUBREG)
6508 if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6512 /* Now look at our tree code and possibly recurse. */
6513 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
6515 case tcc_declaration:
6516 exp_rtl = DECL_RTL_IF_SET (exp);
6522 case tcc_exceptional:
6523 if (TREE_CODE (exp) == TREE_LIST)
6527 if (TREE_VALUE (exp) && !safe_from_p (x, TREE_VALUE (exp), 0))
6529 exp = TREE_CHAIN (exp);
6532 if (TREE_CODE (exp) != TREE_LIST)
6533 return safe_from_p (x, exp, 0);
6536 else if (TREE_CODE (exp) == CONSTRUCTOR)
6538 constructor_elt *ce;
6539 unsigned HOST_WIDE_INT idx;
6542 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
6544 if ((ce->index != NULL_TREE && !safe_from_p (x, ce->index, 0))
6545 || !safe_from_p (x, ce->value, 0))
6549 else if (TREE_CODE (exp) == ERROR_MARK)
6550 return 1; /* An already-visited SAVE_EXPR? */
6555 /* The only case we look at here is the DECL_INITIAL inside a
6557 return (TREE_CODE (exp) != DECL_EXPR
6558 || TREE_CODE (DECL_EXPR_DECL (exp)) != VAR_DECL
6559 || !DECL_INITIAL (DECL_EXPR_DECL (exp))
6560 || safe_from_p (x, DECL_INITIAL (DECL_EXPR_DECL (exp)), 0));
6563 case tcc_comparison:
6564 if (!safe_from_p (x, TREE_OPERAND (exp, 1), 0))
6569 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6571 case tcc_expression:
6574 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
6575 the expression. If it is set, we conflict iff we are that rtx or
6576 both are in memory. Otherwise, we check all operands of the
6577 expression recursively. */
6579 switch (TREE_CODE (exp))
6582 /* If the operand is static or we are static, we can't conflict.
6583 Likewise if we don't conflict with the operand at all. */
6584 if (staticp (TREE_OPERAND (exp, 0))
6585 || TREE_STATIC (exp)
6586 || safe_from_p (x, TREE_OPERAND (exp, 0), 0))
6589 /* Otherwise, the only way this can conflict is if we are taking
6590 the address of a DECL a that address if part of X, which is
6592 exp = TREE_OPERAND (exp, 0);
6595 if (!DECL_RTL_SET_P (exp)
6596 || !MEM_P (DECL_RTL (exp)))
6599 exp_rtl = XEXP (DECL_RTL (exp), 0);
6603 case MISALIGNED_INDIRECT_REF:
6604 case ALIGN_INDIRECT_REF:
6607 && alias_sets_conflict_p (MEM_ALIAS_SET (x),
6608 get_alias_set (exp)))
6613 /* Assume that the call will clobber all hard registers and
6615 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6620 case WITH_CLEANUP_EXPR:
6621 case CLEANUP_POINT_EXPR:
6622 /* Lowered by gimplify.c. */
6626 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6632 /* If we have an rtx, we do not need to scan our operands. */
6636 nops = TREE_OPERAND_LENGTH (exp);
6637 for (i = 0; i < nops; i++)
6638 if (TREE_OPERAND (exp, i) != 0
6639 && ! safe_from_p (x, TREE_OPERAND (exp, i), 0))
6645 /* Should never get a type here. */
6649 /* If we have an rtl, find any enclosed object. Then see if we conflict
6653 if (GET_CODE (exp_rtl) == SUBREG)
6655 exp_rtl = SUBREG_REG (exp_rtl);
6657 && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
6661 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
6662 are memory and they conflict. */
6663 return ! (rtx_equal_p (x, exp_rtl)
6664 || (MEM_P (x) && MEM_P (exp_rtl)
6665 && true_dependence (exp_rtl, VOIDmode, x,
6666 rtx_addr_varies_p)));
6669 /* If we reach here, it is safe. */
6674 /* Return the highest power of two that EXP is known to be a multiple of.
6675 This is used in updating alignment of MEMs in array references. */
6677 unsigned HOST_WIDE_INT
6678 highest_pow2_factor (const_tree exp)
6680 unsigned HOST_WIDE_INT c0, c1;
6682 switch (TREE_CODE (exp))
6685 /* We can find the lowest bit that's a one. If the low
6686 HOST_BITS_PER_WIDE_INT bits are zero, return BIGGEST_ALIGNMENT.
6687 We need to handle this case since we can find it in a COND_EXPR,
6688 a MIN_EXPR, or a MAX_EXPR. If the constant overflows, we have an
6689 erroneous program, so return BIGGEST_ALIGNMENT to avoid any
6691 if (TREE_OVERFLOW (exp))
6692 return BIGGEST_ALIGNMENT;
6695 /* Note: tree_low_cst is intentionally not used here,
6696 we don't care about the upper bits. */
6697 c0 = TREE_INT_CST_LOW (exp);
6699 return c0 ? c0 : BIGGEST_ALIGNMENT;
6703 case PLUS_EXPR: case MINUS_EXPR: case MIN_EXPR: case MAX_EXPR:
6704 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6705 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6706 return MIN (c0, c1);
6709 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6710 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6713 case ROUND_DIV_EXPR: case TRUNC_DIV_EXPR: case FLOOR_DIV_EXPR:
6715 if (integer_pow2p (TREE_OPERAND (exp, 1))
6716 && host_integerp (TREE_OPERAND (exp, 1), 1))
6718 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6719 c1 = tree_low_cst (TREE_OPERAND (exp, 1), 1);
6720 return MAX (1, c0 / c1);
6725 /* The highest power of two of a bit-and expression is the maximum of
6726 that of its operands. We typically get here for a complex LHS and
6727 a constant negative power of two on the RHS to force an explicit
6728 alignment, so don't bother looking at the LHS. */
6729 return highest_pow2_factor (TREE_OPERAND (exp, 1));
6733 return highest_pow2_factor (TREE_OPERAND (exp, 0));
6736 return highest_pow2_factor (TREE_OPERAND (exp, 1));
6739 c0 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6740 c1 = highest_pow2_factor (TREE_OPERAND (exp, 2));
6741 return MIN (c0, c1);
6750 /* Similar, except that the alignment requirements of TARGET are
6751 taken into account. Assume it is at least as aligned as its
6752 type, unless it is a COMPONENT_REF in which case the layout of
6753 the structure gives the alignment. */
6755 static unsigned HOST_WIDE_INT
6756 highest_pow2_factor_for_target (const_tree target, const_tree exp)
6758 unsigned HOST_WIDE_INT talign = target_align (target) / BITS_PER_UNIT;
6759 unsigned HOST_WIDE_INT factor = highest_pow2_factor (exp);
6761 return MAX (factor, talign);
6764 /* Return &VAR expression for emulated thread local VAR. */
6767 emutls_var_address (tree var)
6769 tree emuvar = emutls_decl (var);
6770 tree fn = built_in_decls [BUILT_IN_EMUTLS_GET_ADDRESS];
6771 tree arg = build_fold_addr_expr_with_type (emuvar, ptr_type_node);
6772 tree arglist = build_tree_list (NULL_TREE, arg);
6773 tree call = build_function_call_expr (UNKNOWN_LOCATION, fn, arglist);
6774 return fold_convert (build_pointer_type (TREE_TYPE (var)), call);
6778 /* Subroutine of expand_expr. Expand the two operands of a binary
6779 expression EXP0 and EXP1 placing the results in OP0 and OP1.
6780 The value may be stored in TARGET if TARGET is nonzero. The
6781 MODIFIER argument is as documented by expand_expr. */
6784 expand_operands (tree exp0, tree exp1, rtx target, rtx *op0, rtx *op1,
6785 enum expand_modifier modifier)
6787 if (! safe_from_p (target, exp1, 1))
6789 if (operand_equal_p (exp0, exp1, 0))
6791 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6792 *op1 = copy_rtx (*op0);
6796 /* If we need to preserve evaluation order, copy exp0 into its own
6797 temporary variable so that it can't be clobbered by exp1. */
6798 if (flag_evaluation_order && TREE_SIDE_EFFECTS (exp1))
6799 exp0 = save_expr (exp0);
6800 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6801 *op1 = expand_expr (exp1, NULL_RTX, VOIDmode, modifier);
6806 /* Return a MEM that contains constant EXP. DEFER is as for
6807 output_constant_def and MODIFIER is as for expand_expr. */
6810 expand_expr_constant (tree exp, int defer, enum expand_modifier modifier)
6814 mem = output_constant_def (exp, defer);
6815 if (modifier != EXPAND_INITIALIZER)
6816 mem = use_anchored_address (mem);
6820 /* A subroutine of expand_expr_addr_expr. Evaluate the address of EXP.
6821 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6824 expand_expr_addr_expr_1 (tree exp, rtx target, enum machine_mode tmode,
6825 enum expand_modifier modifier, addr_space_t as)
6827 rtx result, subtarget;
6829 HOST_WIDE_INT bitsize, bitpos;
6830 int volatilep, unsignedp;
6831 enum machine_mode mode1;
6833 /* If we are taking the address of a constant and are at the top level,
6834 we have to use output_constant_def since we can't call force_const_mem
6836 /* ??? This should be considered a front-end bug. We should not be
6837 generating ADDR_EXPR of something that isn't an LVALUE. The only
6838 exception here is STRING_CST. */
6839 if (CONSTANT_CLASS_P (exp))
6840 return XEXP (expand_expr_constant (exp, 0, modifier), 0);
6842 /* Everything must be something allowed by is_gimple_addressable. */
6843 switch (TREE_CODE (exp))
6846 /* This case will happen via recursion for &a->b. */
6847 return expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
6850 /* Expand the initializer like constants above. */
6851 return XEXP (expand_expr_constant (DECL_INITIAL (exp), 0, modifier), 0);
6854 /* The real part of the complex number is always first, therefore
6855 the address is the same as the address of the parent object. */
6858 inner = TREE_OPERAND (exp, 0);
6862 /* The imaginary part of the complex number is always second.
6863 The expression is therefore always offset by the size of the
6866 bitpos = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (exp)));
6867 inner = TREE_OPERAND (exp, 0);
6871 /* TLS emulation hook - replace __thread VAR's &VAR with
6872 __emutls_get_address (&_emutls.VAR). */
6873 if (! targetm.have_tls
6874 && TREE_CODE (exp) == VAR_DECL
6875 && DECL_THREAD_LOCAL_P (exp))
6877 exp = emutls_var_address (exp);
6878 return expand_expr (exp, target, tmode, modifier);
6883 /* If the object is a DECL, then expand it for its rtl. Don't bypass
6884 expand_expr, as that can have various side effects; LABEL_DECLs for
6885 example, may not have their DECL_RTL set yet. Expand the rtl of
6886 CONSTRUCTORs too, which should yield a memory reference for the
6887 constructor's contents. Assume language specific tree nodes can
6888 be expanded in some interesting way. */
6889 gcc_assert (TREE_CODE (exp) < LAST_AND_UNUSED_TREE_CODE);
6891 || TREE_CODE (exp) == CONSTRUCTOR
6892 || TREE_CODE (exp) == COMPOUND_LITERAL_EXPR)
6894 result = expand_expr (exp, target, tmode,
6895 modifier == EXPAND_INITIALIZER
6896 ? EXPAND_INITIALIZER : EXPAND_CONST_ADDRESS);
6898 /* If the DECL isn't in memory, then the DECL wasn't properly
6899 marked TREE_ADDRESSABLE, which will be either a front-end
6900 or a tree optimizer bug. */
6901 gcc_assert (MEM_P (result));
6902 result = XEXP (result, 0);
6904 /* ??? Is this needed anymore? */
6905 if (DECL_P (exp) && !TREE_USED (exp) == 0)
6907 assemble_external (exp);
6908 TREE_USED (exp) = 1;
6911 if (modifier != EXPAND_INITIALIZER
6912 && modifier != EXPAND_CONST_ADDRESS)
6913 result = force_operand (result, target);
6917 /* Pass FALSE as the last argument to get_inner_reference although
6918 we are expanding to RTL. The rationale is that we know how to
6919 handle "aligning nodes" here: we can just bypass them because
6920 they won't change the final object whose address will be returned
6921 (they actually exist only for that purpose). */
6922 inner = get_inner_reference (exp, &bitsize, &bitpos, &offset,
6923 &mode1, &unsignedp, &volatilep, false);
6927 /* We must have made progress. */
6928 gcc_assert (inner != exp);
6930 subtarget = offset || bitpos ? NULL_RTX : target;
6931 /* For VIEW_CONVERT_EXPR, where the outer alignment is bigger than
6932 inner alignment, force the inner to be sufficiently aligned. */
6933 if (CONSTANT_CLASS_P (inner)
6934 && TYPE_ALIGN (TREE_TYPE (inner)) < TYPE_ALIGN (TREE_TYPE (exp)))
6936 inner = copy_node (inner);
6937 TREE_TYPE (inner) = copy_node (TREE_TYPE (inner));
6938 TYPE_ALIGN (TREE_TYPE (inner)) = TYPE_ALIGN (TREE_TYPE (exp));
6939 TYPE_USER_ALIGN (TREE_TYPE (inner)) = 1;
6941 result = expand_expr_addr_expr_1 (inner, subtarget, tmode, modifier, as);
6947 if (modifier != EXPAND_NORMAL)
6948 result = force_operand (result, NULL);
6949 tmp = expand_expr (offset, NULL_RTX, tmode,
6950 modifier == EXPAND_INITIALIZER
6951 ? EXPAND_INITIALIZER : EXPAND_NORMAL);
6953 result = convert_memory_address_addr_space (tmode, result, as);
6954 tmp = convert_memory_address_addr_space (tmode, tmp, as);
6956 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
6957 result = gen_rtx_PLUS (tmode, result, tmp);
6960 subtarget = bitpos ? NULL_RTX : target;
6961 result = expand_simple_binop (tmode, PLUS, result, tmp, subtarget,
6962 1, OPTAB_LIB_WIDEN);
6968 /* Someone beforehand should have rejected taking the address
6969 of such an object. */
6970 gcc_assert ((bitpos % BITS_PER_UNIT) == 0);
6972 result = plus_constant (result, bitpos / BITS_PER_UNIT);
6973 if (modifier < EXPAND_SUM)
6974 result = force_operand (result, target);
6980 /* A subroutine of expand_expr. Evaluate EXP, which is an ADDR_EXPR.
6981 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6984 expand_expr_addr_expr (tree exp, rtx target, enum machine_mode tmode,
6985 enum expand_modifier modifier)
6987 addr_space_t as = ADDR_SPACE_GENERIC;
6988 enum machine_mode address_mode = Pmode;
6989 enum machine_mode pointer_mode = ptr_mode;
6990 enum machine_mode rmode;
6993 /* Target mode of VOIDmode says "whatever's natural". */
6994 if (tmode == VOIDmode)
6995 tmode = TYPE_MODE (TREE_TYPE (exp));
6997 if (POINTER_TYPE_P (TREE_TYPE (exp)))
6999 as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)));
7000 address_mode = targetm.addr_space.address_mode (as);
7001 pointer_mode = targetm.addr_space.pointer_mode (as);
7004 /* We can get called with some Weird Things if the user does silliness
7005 like "(short) &a". In that case, convert_memory_address won't do
7006 the right thing, so ignore the given target mode. */
7007 if (tmode != address_mode && tmode != pointer_mode)
7008 tmode = address_mode;
7010 result = expand_expr_addr_expr_1 (TREE_OPERAND (exp, 0), target,
7011 tmode, modifier, as);
7013 /* Despite expand_expr claims concerning ignoring TMODE when not
7014 strictly convenient, stuff breaks if we don't honor it. Note
7015 that combined with the above, we only do this for pointer modes. */
7016 rmode = GET_MODE (result);
7017 if (rmode == VOIDmode)
7020 result = convert_memory_address_addr_space (tmode, result, as);
7025 /* Generate code for computing CONSTRUCTOR EXP.
7026 An rtx for the computed value is returned. If AVOID_TEMP_MEM
7027 is TRUE, instead of creating a temporary variable in memory
7028 NULL is returned and the caller needs to handle it differently. */
7031 expand_constructor (tree exp, rtx target, enum expand_modifier modifier,
7032 bool avoid_temp_mem)
7034 tree type = TREE_TYPE (exp);
7035 enum machine_mode mode = TYPE_MODE (type);
7037 /* Try to avoid creating a temporary at all. This is possible
7038 if all of the initializer is zero.
7039 FIXME: try to handle all [0..255] initializers we can handle
7041 if (TREE_STATIC (exp)
7042 && !TREE_ADDRESSABLE (exp)
7043 && target != 0 && mode == BLKmode
7044 && all_zeros_p (exp))
7046 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
7050 /* All elts simple constants => refer to a constant in memory. But
7051 if this is a non-BLKmode mode, let it store a field at a time
7052 since that should make a CONST_INT or CONST_DOUBLE when we
7053 fold. Likewise, if we have a target we can use, it is best to
7054 store directly into the target unless the type is large enough
7055 that memcpy will be used. If we are making an initializer and
7056 all operands are constant, put it in memory as well.
7058 FIXME: Avoid trying to fill vector constructors piece-meal.
7059 Output them with output_constant_def below unless we're sure
7060 they're zeros. This should go away when vector initializers
7061 are treated like VECTOR_CST instead of arrays. */
7062 if ((TREE_STATIC (exp)
7063 && ((mode == BLKmode
7064 && ! (target != 0 && safe_from_p (target, exp, 1)))
7065 || TREE_ADDRESSABLE (exp)
7066 || (host_integerp (TYPE_SIZE_UNIT (type), 1)
7067 && (! MOVE_BY_PIECES_P
7068 (tree_low_cst (TYPE_SIZE_UNIT (type), 1),
7070 && ! mostly_zeros_p (exp))))
7071 || ((modifier == EXPAND_INITIALIZER || modifier == EXPAND_CONST_ADDRESS)
7072 && TREE_CONSTANT (exp)))
7079 constructor = expand_expr_constant (exp, 1, modifier);
7081 if (modifier != EXPAND_CONST_ADDRESS
7082 && modifier != EXPAND_INITIALIZER
7083 && modifier != EXPAND_SUM)
7084 constructor = validize_mem (constructor);
7089 /* Handle calls that pass values in multiple non-contiguous
7090 locations. The Irix 6 ABI has examples of this. */
7091 if (target == 0 || ! safe_from_p (target, exp, 1)
7092 || GET_CODE (target) == PARALLEL || modifier == EXPAND_STACK_PARM)
7098 = assign_temp (build_qualified_type (type, (TYPE_QUALS (type)
7099 | (TREE_READONLY (exp)
7100 * TYPE_QUAL_CONST))),
7101 0, TREE_ADDRESSABLE (exp), 1);
7104 store_constructor (exp, target, 0, int_expr_size (exp));
7109 /* expand_expr: generate code for computing expression EXP.
7110 An rtx for the computed value is returned. The value is never null.
7111 In the case of a void EXP, const0_rtx is returned.
7113 The value may be stored in TARGET if TARGET is nonzero.
7114 TARGET is just a suggestion; callers must assume that
7115 the rtx returned may not be the same as TARGET.
7117 If TARGET is CONST0_RTX, it means that the value will be ignored.
7119 If TMODE is not VOIDmode, it suggests generating the
7120 result in mode TMODE. But this is done only when convenient.
7121 Otherwise, TMODE is ignored and the value generated in its natural mode.
7122 TMODE is just a suggestion; callers must assume that
7123 the rtx returned may not have mode TMODE.
7125 Note that TARGET may have neither TMODE nor MODE. In that case, it
7126 probably will not be used.
7128 If MODIFIER is EXPAND_SUM then when EXP is an addition
7129 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
7130 or a nest of (PLUS ...) and (MINUS ...) where the terms are
7131 products as above, or REG or MEM, or constant.
7132 Ordinarily in such cases we would output mul or add instructions
7133 and then return a pseudo reg containing the sum.
7135 EXPAND_INITIALIZER is much like EXPAND_SUM except that
7136 it also marks a label as absolutely required (it can't be dead).
7137 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
7138 This is used for outputting expressions used in initializers.
7140 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
7141 with a constant address even if that address is not normally legitimate.
7142 EXPAND_INITIALIZER and EXPAND_SUM also have this effect.
7144 EXPAND_STACK_PARM is used when expanding to a TARGET on the stack for
7145 a call parameter. Such targets require special care as we haven't yet
7146 marked TARGET so that it's safe from being trashed by libcalls. We
7147 don't want to use TARGET for anything but the final result;
7148 Intermediate values must go elsewhere. Additionally, calls to
7149 emit_block_move will be flagged with BLOCK_OP_CALL_PARM.
7151 If EXP is a VAR_DECL whose DECL_RTL was a MEM with an invalid
7152 address, and ALT_RTL is non-NULL, then *ALT_RTL is set to the
7153 DECL_RTL of the VAR_DECL. *ALT_RTL is also set if EXP is a
7154 COMPOUND_EXPR whose second argument is such a VAR_DECL, and so on
7158 expand_expr_real (tree exp, rtx target, enum machine_mode tmode,
7159 enum expand_modifier modifier, rtx *alt_rtl)
7163 /* Handle ERROR_MARK before anybody tries to access its type. */
7164 if (TREE_CODE (exp) == ERROR_MARK
7165 || (TREE_CODE (TREE_TYPE (exp)) == ERROR_MARK))
7167 ret = CONST0_RTX (tmode);
7168 return ret ? ret : const0_rtx;
7171 /* If this is an expression of some kind and it has an associated line
7172 number, then emit the line number before expanding the expression.
7174 We need to save and restore the file and line information so that
7175 errors discovered during expansion are emitted with the right
7176 information. It would be better of the diagnostic routines
7177 used the file/line information embedded in the tree nodes rather
7179 if (cfun && EXPR_HAS_LOCATION (exp))
7181 location_t saved_location = input_location;
7182 location_t saved_curr_loc = get_curr_insn_source_location ();
7183 tree saved_block = get_curr_insn_block ();
7184 input_location = EXPR_LOCATION (exp);
7185 set_curr_insn_source_location (input_location);
7187 /* Record where the insns produced belong. */
7188 set_curr_insn_block (TREE_BLOCK (exp));
7190 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
7192 input_location = saved_location;
7193 set_curr_insn_block (saved_block);
7194 set_curr_insn_source_location (saved_curr_loc);
7198 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
7205 expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode,
7206 enum expand_modifier modifier)
7208 rtx op0, op1, op2, temp;
7211 enum machine_mode mode;
7212 enum tree_code code = ops->code;
7214 rtx subtarget, original_target;
7216 tree subexp0, subexp1;
7217 bool reduce_bit_field;
7218 gimple subexp0_def, subexp1_def;
7220 location_t loc = ops->location;
7221 tree treeop0, treeop1;
7222 #define REDUCE_BIT_FIELD(expr) (reduce_bit_field \
7223 ? reduce_to_bit_field_precision ((expr), \
7229 mode = TYPE_MODE (type);
7230 unsignedp = TYPE_UNSIGNED (type);
7235 /* We should be called only on simple (binary or unary) expressions,
7236 exactly those that are valid in gimple expressions that aren't
7237 GIMPLE_SINGLE_RHS (or invalid). */
7238 gcc_assert (get_gimple_rhs_class (code) == GIMPLE_UNARY_RHS
7239 || get_gimple_rhs_class (code) == GIMPLE_BINARY_RHS);
7241 ignore = (target == const0_rtx
7242 || ((CONVERT_EXPR_CODE_P (code)
7243 || code == COND_EXPR || code == VIEW_CONVERT_EXPR)
7244 && TREE_CODE (type) == VOID_TYPE));
7246 /* We should be called only if we need the result. */
7247 gcc_assert (!ignore);
7249 /* An operation in what may be a bit-field type needs the
7250 result to be reduced to the precision of the bit-field type,
7251 which is narrower than that of the type's mode. */
7252 reduce_bit_field = (TREE_CODE (type) == INTEGER_TYPE
7253 && GET_MODE_PRECISION (mode) > TYPE_PRECISION (type));
7255 if (reduce_bit_field && modifier == EXPAND_STACK_PARM)
7258 /* Use subtarget as the target for operand 0 of a binary operation. */
7259 subtarget = get_subtarget (target);
7260 original_target = target;
7264 case NON_LVALUE_EXPR:
7267 if (treeop0 == error_mark_node)
7270 if (TREE_CODE (type) == UNION_TYPE)
7272 tree valtype = TREE_TYPE (treeop0);
7274 /* If both input and output are BLKmode, this conversion isn't doing
7275 anything except possibly changing memory attribute. */
7276 if (mode == BLKmode && TYPE_MODE (valtype) == BLKmode)
7278 rtx result = expand_expr (treeop0, target, tmode,
7281 result = copy_rtx (result);
7282 set_mem_attributes (result, type, 0);
7288 if (TYPE_MODE (type) != BLKmode)
7289 target = gen_reg_rtx (TYPE_MODE (type));
7291 target = assign_temp (type, 0, 1, 1);
7295 /* Store data into beginning of memory target. */
7296 store_expr (treeop0,
7297 adjust_address (target, TYPE_MODE (valtype), 0),
7298 modifier == EXPAND_STACK_PARM,
7303 gcc_assert (REG_P (target));
7305 /* Store this field into a union of the proper type. */
7306 store_field (target,
7307 MIN ((int_size_in_bytes (TREE_TYPE
7310 (HOST_WIDE_INT) GET_MODE_BITSIZE (mode)),
7311 0, TYPE_MODE (valtype), treeop0,
7315 /* Return the entire union. */
7319 if (mode == TYPE_MODE (TREE_TYPE (treeop0)))
7321 op0 = expand_expr (treeop0, target, VOIDmode,
7324 /* If the signedness of the conversion differs and OP0 is
7325 a promoted SUBREG, clear that indication since we now
7326 have to do the proper extension. */
7327 if (TYPE_UNSIGNED (TREE_TYPE (treeop0)) != unsignedp
7328 && GET_CODE (op0) == SUBREG)
7329 SUBREG_PROMOTED_VAR_P (op0) = 0;
7331 return REDUCE_BIT_FIELD (op0);
7334 op0 = expand_expr (treeop0, NULL_RTX, mode,
7335 modifier == EXPAND_SUM ? EXPAND_NORMAL : modifier);
7336 if (GET_MODE (op0) == mode)
7339 /* If OP0 is a constant, just convert it into the proper mode. */
7340 else if (CONSTANT_P (op0))
7342 tree inner_type = TREE_TYPE (treeop0);
7343 enum machine_mode inner_mode = TYPE_MODE (inner_type);
7345 if (modifier == EXPAND_INITIALIZER)
7346 op0 = simplify_gen_subreg (mode, op0, inner_mode,
7347 subreg_lowpart_offset (mode,
7350 op0= convert_modes (mode, inner_mode, op0,
7351 TYPE_UNSIGNED (inner_type));
7354 else if (modifier == EXPAND_INITIALIZER)
7355 op0 = gen_rtx_fmt_e (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
7357 else if (target == 0)
7358 op0 = convert_to_mode (mode, op0,
7359 TYPE_UNSIGNED (TREE_TYPE
7363 convert_move (target, op0,
7364 TYPE_UNSIGNED (TREE_TYPE (treeop0)));
7368 return REDUCE_BIT_FIELD (op0);
7370 case ADDR_SPACE_CONVERT_EXPR:
7372 tree treeop0_type = TREE_TYPE (treeop0);
7374 addr_space_t as_from;
7376 gcc_assert (POINTER_TYPE_P (type));
7377 gcc_assert (POINTER_TYPE_P (treeop0_type));
7379 as_to = TYPE_ADDR_SPACE (TREE_TYPE (type));
7380 as_from = TYPE_ADDR_SPACE (TREE_TYPE (treeop0_type));
7382 /* Conversions between pointers to the same address space should
7383 have been implemented via CONVERT_EXPR / NOP_EXPR. */
7384 gcc_assert (as_to != as_from);
7386 /* Ask target code to handle conversion between pointers
7387 to overlapping address spaces. */
7388 if (targetm.addr_space.subset_p (as_to, as_from)
7389 || targetm.addr_space.subset_p (as_from, as_to))
7391 op0 = expand_expr (treeop0, NULL_RTX, VOIDmode, modifier);
7392 op0 = targetm.addr_space.convert (op0, treeop0_type, type);
7397 /* For disjoint address spaces, converting anything but
7398 a null pointer invokes undefined behaviour. We simply
7399 always return a null pointer here. */
7400 return CONST0_RTX (mode);
7403 case POINTER_PLUS_EXPR:
7404 /* Even though the sizetype mode and the pointer's mode can be different
7405 expand is able to handle this correctly and get the correct result out
7406 of the PLUS_EXPR code. */
7407 /* Make sure to sign-extend the sizetype offset in a POINTER_PLUS_EXPR
7408 if sizetype precision is smaller than pointer precision. */
7409 if (TYPE_PRECISION (sizetype) < TYPE_PRECISION (type))
7410 treeop1 = fold_convert_loc (loc, type,
7411 fold_convert_loc (loc, ssizetype,
7415 /* Check if this is a case for multiplication and addition. */
7416 if ((TREE_CODE (type) == INTEGER_TYPE
7417 || TREE_CODE (type) == FIXED_POINT_TYPE)
7418 && (subexp0_def = get_def_for_expr (treeop0,
7421 tree subsubexp0, subsubexp1;
7422 gimple subsubexp0_def, subsubexp1_def;
7423 enum tree_code this_code;
7425 this_code = TREE_CODE (type) == INTEGER_TYPE ? NOP_EXPR
7426 : FIXED_CONVERT_EXPR;
7427 subsubexp0 = gimple_assign_rhs1 (subexp0_def);
7428 subsubexp0_def = get_def_for_expr (subsubexp0, this_code);
7429 subsubexp1 = gimple_assign_rhs2 (subexp0_def);
7430 subsubexp1_def = get_def_for_expr (subsubexp1, this_code);
7431 if (subsubexp0_def && subsubexp1_def
7432 && (top0 = gimple_assign_rhs1 (subsubexp0_def))
7433 && (top1 = gimple_assign_rhs1 (subsubexp1_def))
7434 && (TYPE_PRECISION (TREE_TYPE (top0))
7435 < TYPE_PRECISION (TREE_TYPE (subsubexp0)))
7436 && (TYPE_PRECISION (TREE_TYPE (top0))
7437 == TYPE_PRECISION (TREE_TYPE (top1)))
7438 && (TYPE_UNSIGNED (TREE_TYPE (top0))
7439 == TYPE_UNSIGNED (TREE_TYPE (top1))))
7441 tree op0type = TREE_TYPE (top0);
7442 enum machine_mode innermode = TYPE_MODE (op0type);
7443 bool zextend_p = TYPE_UNSIGNED (op0type);
7444 bool sat_p = TYPE_SATURATING (TREE_TYPE (subsubexp0));
7446 this_optab = zextend_p ? umadd_widen_optab : smadd_widen_optab;
7448 this_optab = zextend_p ? usmadd_widen_optab
7449 : ssmadd_widen_optab;
7450 if (mode == GET_MODE_2XWIDER_MODE (innermode)
7451 && (optab_handler (this_optab, mode)->insn_code
7452 != CODE_FOR_nothing))
7454 expand_operands (top0, top1, NULL_RTX, &op0, &op1,
7456 op2 = expand_expr (treeop1, subtarget,
7457 VOIDmode, EXPAND_NORMAL);
7458 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
7461 return REDUCE_BIT_FIELD (temp);
7466 /* If we are adding a constant, a VAR_DECL that is sp, fp, or ap, and
7467 something else, make sure we add the register to the constant and
7468 then to the other thing. This case can occur during strength
7469 reduction and doing it this way will produce better code if the
7470 frame pointer or argument pointer is eliminated.
7472 fold-const.c will ensure that the constant is always in the inner
7473 PLUS_EXPR, so the only case we need to do anything about is if
7474 sp, ap, or fp is our second argument, in which case we must swap
7475 the innermost first argument and our second argument. */
7477 if (TREE_CODE (treeop0) == PLUS_EXPR
7478 && TREE_CODE (TREE_OPERAND (treeop0, 1)) == INTEGER_CST
7479 && TREE_CODE (treeop1) == VAR_DECL
7480 && (DECL_RTL (treeop1) == frame_pointer_rtx
7481 || DECL_RTL (treeop1) == stack_pointer_rtx
7482 || DECL_RTL (treeop1) == arg_pointer_rtx))
7486 treeop1 = TREE_OPERAND (treeop0, 0);
7487 TREE_OPERAND (treeop0, 0) = t;
7490 /* If the result is to be ptr_mode and we are adding an integer to
7491 something, we might be forming a constant. So try to use
7492 plus_constant. If it produces a sum and we can't accept it,
7493 use force_operand. This allows P = &ARR[const] to generate
7494 efficient code on machines where a SYMBOL_REF is not a valid
7497 If this is an EXPAND_SUM call, always return the sum. */
7498 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
7499 || (mode == ptr_mode && (unsignedp || ! flag_trapv)))
7501 if (modifier == EXPAND_STACK_PARM)
7503 if (TREE_CODE (treeop0) == INTEGER_CST
7504 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7505 && TREE_CONSTANT (treeop1))
7509 op1 = expand_expr (treeop1, subtarget, VOIDmode,
7511 /* Use immed_double_const to ensure that the constant is
7512 truncated according to the mode of OP1, then sign extended
7513 to a HOST_WIDE_INT. Using the constant directly can result
7514 in non-canonical RTL in a 64x32 cross compile. */
7516 = immed_double_const (TREE_INT_CST_LOW (treeop0),
7518 TYPE_MODE (TREE_TYPE (treeop1)));
7519 op1 = plus_constant (op1, INTVAL (constant_part));
7520 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7521 op1 = force_operand (op1, target);
7522 return REDUCE_BIT_FIELD (op1);
7525 else if (TREE_CODE (treeop1) == INTEGER_CST
7526 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7527 && TREE_CONSTANT (treeop0))
7531 op0 = expand_expr (treeop0, subtarget, VOIDmode,
7532 (modifier == EXPAND_INITIALIZER
7533 ? EXPAND_INITIALIZER : EXPAND_SUM));
7534 if (! CONSTANT_P (op0))
7536 op1 = expand_expr (treeop1, NULL_RTX,
7537 VOIDmode, modifier);
7538 /* Return a PLUS if modifier says it's OK. */
7539 if (modifier == EXPAND_SUM
7540 || modifier == EXPAND_INITIALIZER)
7541 return simplify_gen_binary (PLUS, mode, op0, op1);
7544 /* Use immed_double_const to ensure that the constant is
7545 truncated according to the mode of OP1, then sign extended
7546 to a HOST_WIDE_INT. Using the constant directly can result
7547 in non-canonical RTL in a 64x32 cross compile. */
7549 = immed_double_const (TREE_INT_CST_LOW (treeop1),
7551 TYPE_MODE (TREE_TYPE (treeop0)));
7552 op0 = plus_constant (op0, INTVAL (constant_part));
7553 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7554 op0 = force_operand (op0, target);
7555 return REDUCE_BIT_FIELD (op0);
7559 /* No sense saving up arithmetic to be done
7560 if it's all in the wrong mode to form part of an address.
7561 And force_operand won't know whether to sign-extend or
7563 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7564 || mode != ptr_mode)
7566 expand_operands (treeop0, treeop1,
7567 subtarget, &op0, &op1, EXPAND_NORMAL);
7568 if (op0 == const0_rtx)
7570 if (op1 == const0_rtx)
7575 expand_operands (treeop0, treeop1,
7576 subtarget, &op0, &op1, modifier);
7577 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
7580 /* Check if this is a case for multiplication and subtraction. */
7581 if ((TREE_CODE (type) == INTEGER_TYPE
7582 || TREE_CODE (type) == FIXED_POINT_TYPE)
7583 && (subexp1_def = get_def_for_expr (treeop1,
7586 tree subsubexp0, subsubexp1;
7587 gimple subsubexp0_def, subsubexp1_def;
7588 enum tree_code this_code;
7590 this_code = TREE_CODE (type) == INTEGER_TYPE ? NOP_EXPR
7591 : FIXED_CONVERT_EXPR;
7592 subsubexp0 = gimple_assign_rhs1 (subexp1_def);
7593 subsubexp0_def = get_def_for_expr (subsubexp0, this_code);
7594 subsubexp1 = gimple_assign_rhs2 (subexp1_def);
7595 subsubexp1_def = get_def_for_expr (subsubexp1, this_code);
7596 if (subsubexp0_def && subsubexp1_def
7597 && (top0 = gimple_assign_rhs1 (subsubexp0_def))
7598 && (top1 = gimple_assign_rhs1 (subsubexp1_def))
7599 && (TYPE_PRECISION (TREE_TYPE (top0))
7600 < TYPE_PRECISION (TREE_TYPE (subsubexp0)))
7601 && (TYPE_PRECISION (TREE_TYPE (top0))
7602 == TYPE_PRECISION (TREE_TYPE (top1)))
7603 && (TYPE_UNSIGNED (TREE_TYPE (top0))
7604 == TYPE_UNSIGNED (TREE_TYPE (top1))))
7606 tree op0type = TREE_TYPE (top0);
7607 enum machine_mode innermode = TYPE_MODE (op0type);
7608 bool zextend_p = TYPE_UNSIGNED (op0type);
7609 bool sat_p = TYPE_SATURATING (TREE_TYPE (subsubexp0));
7611 this_optab = zextend_p ? umsub_widen_optab : smsub_widen_optab;
7613 this_optab = zextend_p ? usmsub_widen_optab
7614 : ssmsub_widen_optab;
7615 if (mode == GET_MODE_2XWIDER_MODE (innermode)
7616 && (optab_handler (this_optab, mode)->insn_code
7617 != CODE_FOR_nothing))
7619 expand_operands (top0, top1, NULL_RTX, &op0, &op1,
7621 op2 = expand_expr (treeop0, subtarget,
7622 VOIDmode, EXPAND_NORMAL);
7623 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
7626 return REDUCE_BIT_FIELD (temp);
7631 /* For initializers, we are allowed to return a MINUS of two
7632 symbolic constants. Here we handle all cases when both operands
7634 /* Handle difference of two symbolic constants,
7635 for the sake of an initializer. */
7636 if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7637 && really_constant_p (treeop0)
7638 && really_constant_p (treeop1))
7640 expand_operands (treeop0, treeop1,
7641 NULL_RTX, &op0, &op1, modifier);
7643 /* If the last operand is a CONST_INT, use plus_constant of
7644 the negated constant. Else make the MINUS. */
7645 if (CONST_INT_P (op1))
7646 return REDUCE_BIT_FIELD (plus_constant (op0, - INTVAL (op1)));
7648 return REDUCE_BIT_FIELD (gen_rtx_MINUS (mode, op0, op1));
7651 /* No sense saving up arithmetic to be done
7652 if it's all in the wrong mode to form part of an address.
7653 And force_operand won't know whether to sign-extend or
7655 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7656 || mode != ptr_mode)
7659 expand_operands (treeop0, treeop1,
7660 subtarget, &op0, &op1, modifier);
7662 /* Convert A - const to A + (-const). */
7663 if (CONST_INT_P (op1))
7665 op1 = negate_rtx (mode, op1);
7666 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
7672 /* If this is a fixed-point operation, then we cannot use the code
7673 below because "expand_mult" doesn't support sat/no-sat fixed-point
7675 if (ALL_FIXED_POINT_MODE_P (mode))
7678 /* If first operand is constant, swap them.
7679 Thus the following special case checks need only
7680 check the second operand. */
7681 if (TREE_CODE (treeop0) == INTEGER_CST)
7688 /* Attempt to return something suitable for generating an
7689 indexed address, for machines that support that. */
7691 if (modifier == EXPAND_SUM && mode == ptr_mode
7692 && host_integerp (treeop1, 0))
7694 tree exp1 = treeop1;
7696 op0 = expand_expr (treeop0, subtarget, VOIDmode,
7700 op0 = force_operand (op0, NULL_RTX);
7702 op0 = copy_to_mode_reg (mode, op0);
7704 return REDUCE_BIT_FIELD (gen_rtx_MULT (mode, op0,
7705 gen_int_mode (tree_low_cst (exp1, 0),
7706 TYPE_MODE (TREE_TYPE (exp1)))));
7709 if (modifier == EXPAND_STACK_PARM)
7712 /* Check for multiplying things that have been extended
7713 from a narrower type. If this machine supports multiplying
7714 in that narrower type with a result in the desired type,
7715 do it that way, and avoid the explicit type-conversion. */
7719 subexp0_def = get_def_for_expr (subexp0, NOP_EXPR);
7720 subexp1_def = get_def_for_expr (subexp1, NOP_EXPR);
7721 top0 = top1 = NULL_TREE;
7723 /* First, check if we have a multiplication of one signed and one
7724 unsigned operand. */
7726 && (top0 = gimple_assign_rhs1 (subexp0_def))
7728 && (top1 = gimple_assign_rhs1 (subexp1_def))
7729 && TREE_CODE (type) == INTEGER_TYPE
7730 && (TYPE_PRECISION (TREE_TYPE (top0))
7731 < TYPE_PRECISION (TREE_TYPE (subexp0)))
7732 && (TYPE_PRECISION (TREE_TYPE (top0))
7733 == TYPE_PRECISION (TREE_TYPE (top1)))
7734 && (TYPE_UNSIGNED (TREE_TYPE (top0))
7735 != TYPE_UNSIGNED (TREE_TYPE (top1))))
7737 enum machine_mode innermode
7738 = TYPE_MODE (TREE_TYPE (top0));
7739 this_optab = usmul_widen_optab;
7740 if (mode == GET_MODE_WIDER_MODE (innermode))
7742 if (optab_handler (this_optab, mode)->insn_code != CODE_FOR_nothing)
7744 if (TYPE_UNSIGNED (TREE_TYPE (top0)))
7745 expand_operands (top0, top1, NULL_RTX, &op0, &op1,
7748 expand_operands (top0, top1, NULL_RTX, &op1, &op0,
7755 /* Check for a multiplication with matching signedness. If
7756 valid, TOP0 and TOP1 were set in the previous if
7759 && TREE_CODE (type) == INTEGER_TYPE
7760 && (TYPE_PRECISION (TREE_TYPE (top0))
7761 < TYPE_PRECISION (TREE_TYPE (subexp0)))
7762 && ((TREE_CODE (subexp1) == INTEGER_CST
7763 && int_fits_type_p (subexp1, TREE_TYPE (top0))
7764 /* Don't use a widening multiply if a shift will do. */
7765 && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (subexp1)))
7766 > HOST_BITS_PER_WIDE_INT)
7767 || exact_log2 (TREE_INT_CST_LOW (subexp1)) < 0))
7770 && (TYPE_PRECISION (TREE_TYPE (top1))
7771 == TYPE_PRECISION (TREE_TYPE (top0))
7772 /* If both operands are extended, they must either both
7773 be zero-extended or both be sign-extended. */
7774 && (TYPE_UNSIGNED (TREE_TYPE (top1))
7775 == TYPE_UNSIGNED (TREE_TYPE (top0)))))))
7777 tree op0type = TREE_TYPE (top0);
7778 enum machine_mode innermode = TYPE_MODE (op0type);
7779 bool zextend_p = TYPE_UNSIGNED (op0type);
7780 optab other_optab = zextend_p ? smul_widen_optab : umul_widen_optab;
7781 this_optab = zextend_p ? umul_widen_optab : smul_widen_optab;
7783 if (mode == GET_MODE_2XWIDER_MODE (innermode))
7785 if (optab_handler (this_optab, mode)->insn_code != CODE_FOR_nothing)
7787 if (TREE_CODE (subexp1) == INTEGER_CST)
7788 expand_operands (top0, subexp1, NULL_RTX, &op0, &op1,
7791 expand_operands (top0, top1, NULL_RTX, &op0, &op1,
7795 else if (optab_handler (other_optab, mode)->insn_code != CODE_FOR_nothing
7796 && innermode == word_mode)
7799 op0 = expand_normal (top0);
7800 if (TREE_CODE (subexp1) == INTEGER_CST)
7801 op1 = convert_modes (innermode, mode,
7802 expand_normal (subexp1), unsignedp);
7804 op1 = expand_normal (top1);
7805 temp = expand_binop (mode, other_optab, op0, op1, target,
7806 unsignedp, OPTAB_LIB_WIDEN);
7807 hipart = gen_highpart (innermode, temp);
7808 htem = expand_mult_highpart_adjust (innermode, hipart,
7812 emit_move_insn (hipart, htem);
7813 return REDUCE_BIT_FIELD (temp);
7817 expand_operands (subexp0, subexp1, subtarget, &op0, &op1, EXPAND_NORMAL);
7818 return REDUCE_BIT_FIELD (expand_mult (mode, op0, op1, target, unsignedp));
7820 case TRUNC_DIV_EXPR:
7821 case FLOOR_DIV_EXPR:
7823 case ROUND_DIV_EXPR:
7824 case EXACT_DIV_EXPR:
7825 /* If this is a fixed-point operation, then we cannot use the code
7826 below because "expand_divmod" doesn't support sat/no-sat fixed-point
7828 if (ALL_FIXED_POINT_MODE_P (mode))
7831 if (modifier == EXPAND_STACK_PARM)
7833 /* Possible optimization: compute the dividend with EXPAND_SUM
7834 then if the divisor is constant can optimize the case
7835 where some terms of the dividend have coeffs divisible by it. */
7836 expand_operands (treeop0, treeop1,
7837 subtarget, &op0, &op1, EXPAND_NORMAL);
7838 return expand_divmod (0, code, mode, op0, op1, target, unsignedp);
7843 case TRUNC_MOD_EXPR:
7844 case FLOOR_MOD_EXPR:
7846 case ROUND_MOD_EXPR:
7847 if (modifier == EXPAND_STACK_PARM)
7849 expand_operands (treeop0, treeop1,
7850 subtarget, &op0, &op1, EXPAND_NORMAL);
7851 return expand_divmod (1, code, mode, op0, op1, target, unsignedp);
7853 case FIXED_CONVERT_EXPR:
7854 op0 = expand_normal (treeop0);
7855 if (target == 0 || modifier == EXPAND_STACK_PARM)
7856 target = gen_reg_rtx (mode);
7858 if ((TREE_CODE (TREE_TYPE (treeop0)) == INTEGER_TYPE
7859 && TYPE_UNSIGNED (TREE_TYPE (treeop0)))
7860 || (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type)))
7861 expand_fixed_convert (target, op0, 1, TYPE_SATURATING (type));
7863 expand_fixed_convert (target, op0, 0, TYPE_SATURATING (type));
7866 case FIX_TRUNC_EXPR:
7867 op0 = expand_normal (treeop0);
7868 if (target == 0 || modifier == EXPAND_STACK_PARM)
7869 target = gen_reg_rtx (mode);
7870 expand_fix (target, op0, unsignedp);
7874 op0 = expand_normal (treeop0);
7875 if (target == 0 || modifier == EXPAND_STACK_PARM)
7876 target = gen_reg_rtx (mode);
7877 /* expand_float can't figure out what to do if FROM has VOIDmode.
7878 So give it the correct mode. With -O, cse will optimize this. */
7879 if (GET_MODE (op0) == VOIDmode)
7880 op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (treeop0)),
7882 expand_float (target, op0,
7883 TYPE_UNSIGNED (TREE_TYPE (treeop0)));
7887 op0 = expand_expr (treeop0, subtarget,
7888 VOIDmode, EXPAND_NORMAL);
7889 if (modifier == EXPAND_STACK_PARM)
7891 temp = expand_unop (mode,
7892 optab_for_tree_code (NEGATE_EXPR, type,
7896 return REDUCE_BIT_FIELD (temp);
7899 op0 = expand_expr (treeop0, subtarget,
7900 VOIDmode, EXPAND_NORMAL);
7901 if (modifier == EXPAND_STACK_PARM)
7904 /* ABS_EXPR is not valid for complex arguments. */
7905 gcc_assert (GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
7906 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT);
7908 /* Unsigned abs is simply the operand. Testing here means we don't
7909 risk generating incorrect code below. */
7910 if (TYPE_UNSIGNED (type))
7913 return expand_abs (mode, op0, target, unsignedp,
7914 safe_from_p (target, treeop0, 1));
7918 target = original_target;
7920 || modifier == EXPAND_STACK_PARM
7921 || (MEM_P (target) && MEM_VOLATILE_P (target))
7922 || GET_MODE (target) != mode
7924 && REGNO (target) < FIRST_PSEUDO_REGISTER))
7925 target = gen_reg_rtx (mode);
7926 expand_operands (treeop0, treeop1,
7927 target, &op0, &op1, EXPAND_NORMAL);
7929 /* First try to do it with a special MIN or MAX instruction.
7930 If that does not win, use a conditional jump to select the proper
7932 this_optab = optab_for_tree_code (code, type, optab_default);
7933 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
7938 /* At this point, a MEM target is no longer useful; we will get better
7941 if (! REG_P (target))
7942 target = gen_reg_rtx (mode);
7944 /* If op1 was placed in target, swap op0 and op1. */
7945 if (target != op0 && target == op1)
7952 /* We generate better code and avoid problems with op1 mentioning
7953 target by forcing op1 into a pseudo if it isn't a constant. */
7954 if (! CONSTANT_P (op1))
7955 op1 = force_reg (mode, op1);
7958 enum rtx_code comparison_code;
7961 if (code == MAX_EXPR)
7962 comparison_code = unsignedp ? GEU : GE;
7964 comparison_code = unsignedp ? LEU : LE;
7966 /* Canonicalize to comparisons against 0. */
7967 if (op1 == const1_rtx)
7969 /* Converting (a >= 1 ? a : 1) into (a > 0 ? a : 1)
7970 or (a != 0 ? a : 1) for unsigned.
7971 For MIN we are safe converting (a <= 1 ? a : 1)
7972 into (a <= 0 ? a : 1) */
7973 cmpop1 = const0_rtx;
7974 if (code == MAX_EXPR)
7975 comparison_code = unsignedp ? NE : GT;
7977 if (op1 == constm1_rtx && !unsignedp)
7979 /* Converting (a >= -1 ? a : -1) into (a >= 0 ? a : -1)
7980 and (a <= -1 ? a : -1) into (a < 0 ? a : -1) */
7981 cmpop1 = const0_rtx;
7982 if (code == MIN_EXPR)
7983 comparison_code = LT;
7985 #ifdef HAVE_conditional_move
7986 /* Use a conditional move if possible. */
7987 if (can_conditionally_move_p (mode))
7991 /* ??? Same problem as in expmed.c: emit_conditional_move
7992 forces a stack adjustment via compare_from_rtx, and we
7993 lose the stack adjustment if the sequence we are about
7994 to create is discarded. */
7995 do_pending_stack_adjust ();
7999 /* Try to emit the conditional move. */
8000 insn = emit_conditional_move (target, comparison_code,
8005 /* If we could do the conditional move, emit the sequence,
8009 rtx seq = get_insns ();
8015 /* Otherwise discard the sequence and fall back to code with
8021 emit_move_insn (target, op0);
8023 temp = gen_label_rtx ();
8024 do_compare_rtx_and_jump (target, cmpop1, comparison_code,
8025 unsignedp, mode, NULL_RTX, NULL_RTX, temp,
8028 emit_move_insn (target, op1);
8033 op0 = expand_expr (treeop0, subtarget,
8034 VOIDmode, EXPAND_NORMAL);
8035 if (modifier == EXPAND_STACK_PARM)
8037 temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
8041 /* ??? Can optimize bitwise operations with one arg constant.
8042 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
8043 and (a bitwise1 b) bitwise2 b (etc)
8044 but that is probably not worth while. */
8046 /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two
8047 boolean values when we want in all cases to compute both of them. In
8048 general it is fastest to do TRUTH_AND_EXPR by computing both operands
8049 as actual zero-or-1 values and then bitwise anding. In cases where
8050 there cannot be any side effects, better code would be made by
8051 treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is
8052 how to recognize those cases. */
8054 case TRUTH_AND_EXPR:
8055 code = BIT_AND_EXPR;
8060 code = BIT_IOR_EXPR;
8064 case TRUTH_XOR_EXPR:
8065 code = BIT_XOR_EXPR;
8071 gcc_assert (VECTOR_MODE_P (TYPE_MODE (type))
8072 || (GET_MODE_PRECISION (TYPE_MODE (type))
8073 == TYPE_PRECISION (type)));
8078 /* If this is a fixed-point operation, then we cannot use the code
8079 below because "expand_shift" doesn't support sat/no-sat fixed-point
8081 if (ALL_FIXED_POINT_MODE_P (mode))
8084 if (! safe_from_p (subtarget, treeop1, 1))
8086 if (modifier == EXPAND_STACK_PARM)
8088 op0 = expand_expr (treeop0, subtarget,
8089 VOIDmode, EXPAND_NORMAL);
8090 temp = expand_shift (code, mode, op0, treeop1, target,
8092 if (code == LSHIFT_EXPR)
8093 temp = REDUCE_BIT_FIELD (temp);
8096 /* Could determine the answer when only additive constants differ. Also,
8097 the addition of one can be handled by changing the condition. */
8104 case UNORDERED_EXPR:
8112 temp = do_store_flag (ops,
8113 modifier != EXPAND_STACK_PARM ? target : NULL_RTX,
8114 tmode != VOIDmode ? tmode : mode);
8118 /* Use a compare and a jump for BLKmode comparisons, or for function
8119 type comparisons is HAVE_canonicalize_funcptr_for_compare. */
8122 || modifier == EXPAND_STACK_PARM
8123 || ! safe_from_p (target, treeop0, 1)
8124 || ! safe_from_p (target, treeop1, 1)
8125 /* Make sure we don't have a hard reg (such as function's return
8126 value) live across basic blocks, if not optimizing. */
8127 || (!optimize && REG_P (target)
8128 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
8129 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
8131 emit_move_insn (target, const0_rtx);
8133 op1 = gen_label_rtx ();
8134 jumpifnot_1 (code, treeop0, treeop1, op1, -1);
8136 emit_move_insn (target, const1_rtx);
8141 case TRUTH_NOT_EXPR:
8142 if (modifier == EXPAND_STACK_PARM)
8144 op0 = expand_expr (treeop0, target,
8145 VOIDmode, EXPAND_NORMAL);
8146 /* The parser is careful to generate TRUTH_NOT_EXPR
8147 only with operands that are always zero or one. */
8148 temp = expand_binop (mode, xor_optab, op0, const1_rtx,
8149 target, 1, OPTAB_LIB_WIDEN);
8154 /* Get the rtx code of the operands. */
8155 op0 = expand_normal (treeop0);
8156 op1 = expand_normal (treeop1);
8159 target = gen_reg_rtx (TYPE_MODE (type));
8161 /* Move the real (op0) and imaginary (op1) parts to their location. */
8162 write_complex_part (target, op0, false);
8163 write_complex_part (target, op1, true);
8167 case WIDEN_SUM_EXPR:
8169 tree oprnd0 = treeop0;
8170 tree oprnd1 = treeop1;
8172 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8173 target = expand_widen_pattern_expr (ops, op0, NULL_RTX, op1,
8178 case REDUC_MAX_EXPR:
8179 case REDUC_MIN_EXPR:
8180 case REDUC_PLUS_EXPR:
8182 op0 = expand_normal (treeop0);
8183 this_optab = optab_for_tree_code (code, type, optab_default);
8184 temp = expand_unop (mode, this_optab, op0, target, unsignedp);
8189 case VEC_EXTRACT_EVEN_EXPR:
8190 case VEC_EXTRACT_ODD_EXPR:
8192 expand_operands (treeop0, treeop1,
8193 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8194 this_optab = optab_for_tree_code (code, type, optab_default);
8195 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
8201 case VEC_INTERLEAVE_HIGH_EXPR:
8202 case VEC_INTERLEAVE_LOW_EXPR:
8204 expand_operands (treeop0, treeop1,
8205 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8206 this_optab = optab_for_tree_code (code, type, optab_default);
8207 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
8213 case VEC_LSHIFT_EXPR:
8214 case VEC_RSHIFT_EXPR:
8216 target = expand_vec_shift_expr (ops, target);
8220 case VEC_UNPACK_HI_EXPR:
8221 case VEC_UNPACK_LO_EXPR:
8223 op0 = expand_normal (treeop0);
8224 this_optab = optab_for_tree_code (code, type, optab_default);
8225 temp = expand_widen_pattern_expr (ops, op0, NULL_RTX, NULL_RTX,
8231 case VEC_UNPACK_FLOAT_HI_EXPR:
8232 case VEC_UNPACK_FLOAT_LO_EXPR:
8234 op0 = expand_normal (treeop0);
8235 /* The signedness is determined from input operand. */
8236 this_optab = optab_for_tree_code (code,
8237 TREE_TYPE (treeop0),
8239 temp = expand_widen_pattern_expr
8240 (ops, op0, NULL_RTX, NULL_RTX,
8241 target, TYPE_UNSIGNED (TREE_TYPE (treeop0)));
8247 case VEC_WIDEN_MULT_HI_EXPR:
8248 case VEC_WIDEN_MULT_LO_EXPR:
8250 tree oprnd0 = treeop0;
8251 tree oprnd1 = treeop1;
8253 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8254 target = expand_widen_pattern_expr (ops, op0, op1, NULL_RTX,
8256 gcc_assert (target);
8260 case VEC_PACK_TRUNC_EXPR:
8261 case VEC_PACK_SAT_EXPR:
8262 case VEC_PACK_FIX_TRUNC_EXPR:
8263 mode = TYPE_MODE (TREE_TYPE (treeop0));
8270 /* Here to do an ordinary binary operator. */
8272 expand_operands (treeop0, treeop1,
8273 subtarget, &op0, &op1, EXPAND_NORMAL);
8275 this_optab = optab_for_tree_code (code, type, optab_default);
8277 if (modifier == EXPAND_STACK_PARM)
8279 temp = expand_binop (mode, this_optab, op0, op1, target,
8280 unsignedp, OPTAB_LIB_WIDEN);
8282 return REDUCE_BIT_FIELD (temp);
8284 #undef REDUCE_BIT_FIELD
8287 expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
8288 enum expand_modifier modifier, rtx *alt_rtl)
8290 rtx op0, op1, temp, decl_rtl;
8293 enum machine_mode mode;
8294 enum tree_code code = TREE_CODE (exp);
8296 rtx subtarget, original_target;
8299 bool reduce_bit_field;
8300 location_t loc = EXPR_LOCATION (exp);
8301 struct separate_ops ops;
8302 tree treeop0, treeop1, treeop2;
8304 type = TREE_TYPE (exp);
8305 mode = TYPE_MODE (type);
8306 unsignedp = TYPE_UNSIGNED (type);
8308 treeop0 = treeop1 = treeop2 = NULL_TREE;
8309 if (!VL_EXP_CLASS_P (exp))
8310 switch (TREE_CODE_LENGTH (code))
8313 case 3: treeop2 = TREE_OPERAND (exp, 2);
8314 case 2: treeop1 = TREE_OPERAND (exp, 1);
8315 case 1: treeop0 = TREE_OPERAND (exp, 0);
8325 ignore = (target == const0_rtx
8326 || ((CONVERT_EXPR_CODE_P (code)
8327 || code == COND_EXPR || code == VIEW_CONVERT_EXPR)
8328 && TREE_CODE (type) == VOID_TYPE));
8330 /* An operation in what may be a bit-field type needs the
8331 result to be reduced to the precision of the bit-field type,
8332 which is narrower than that of the type's mode. */
8333 reduce_bit_field = (!ignore
8334 && TREE_CODE (type) == INTEGER_TYPE
8335 && GET_MODE_PRECISION (mode) > TYPE_PRECISION (type));
8337 /* If we are going to ignore this result, we need only do something
8338 if there is a side-effect somewhere in the expression. If there
8339 is, short-circuit the most common cases here. Note that we must
8340 not call expand_expr with anything but const0_rtx in case this
8341 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
8345 if (! TREE_SIDE_EFFECTS (exp))
8348 /* Ensure we reference a volatile object even if value is ignored, but
8349 don't do this if all we are doing is taking its address. */
8350 if (TREE_THIS_VOLATILE (exp)
8351 && TREE_CODE (exp) != FUNCTION_DECL
8352 && mode != VOIDmode && mode != BLKmode
8353 && modifier != EXPAND_CONST_ADDRESS)
8355 temp = expand_expr (exp, NULL_RTX, VOIDmode, modifier);
8357 temp = copy_to_reg (temp);
8361 if (TREE_CODE_CLASS (code) == tcc_unary
8362 || code == COMPONENT_REF || code == INDIRECT_REF)
8363 return expand_expr (treeop0, const0_rtx, VOIDmode,
8366 else if (TREE_CODE_CLASS (code) == tcc_binary
8367 || TREE_CODE_CLASS (code) == tcc_comparison
8368 || code == ARRAY_REF || code == ARRAY_RANGE_REF)
8370 expand_expr (treeop0, const0_rtx, VOIDmode, modifier);
8371 expand_expr (treeop1, const0_rtx, VOIDmode, modifier);
8374 else if (code == BIT_FIELD_REF)
8376 expand_expr (treeop0, const0_rtx, VOIDmode, modifier);
8377 expand_expr (treeop1, const0_rtx, VOIDmode, modifier);
8378 expand_expr (treeop2, const0_rtx, VOIDmode, modifier);
8385 if (reduce_bit_field && modifier == EXPAND_STACK_PARM)
8388 /* Use subtarget as the target for operand 0 of a binary operation. */
8389 subtarget = get_subtarget (target);
8390 original_target = target;
8396 tree function = decl_function_context (exp);
8398 temp = label_rtx (exp);
8399 temp = gen_rtx_LABEL_REF (Pmode, temp);
8401 if (function != current_function_decl
8403 LABEL_REF_NONLOCAL_P (temp) = 1;
8405 temp = gen_rtx_MEM (FUNCTION_MODE, temp);
8410 /* ??? ivopts calls expander, without any preparation from
8411 out-of-ssa. So fake instructions as if this was an access to the
8412 base variable. This unnecessarily allocates a pseudo, see how we can
8413 reuse it, if partition base vars have it set already. */
8414 if (!currently_expanding_to_rtl)
8415 return expand_expr_real_1 (SSA_NAME_VAR (exp), target, tmode, modifier, NULL);
8417 gimple g = get_gimple_for_ssa_name (exp);
8419 return expand_expr_real (gimple_assign_rhs_to_tree (g), target,
8420 tmode, modifier, NULL);
8422 decl_rtl = get_rtx_for_ssa_name (exp);
8423 exp = SSA_NAME_VAR (exp);
8424 goto expand_decl_rtl;
8428 /* If a static var's type was incomplete when the decl was written,
8429 but the type is complete now, lay out the decl now. */
8430 if (DECL_SIZE (exp) == 0
8431 && COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (TREE_TYPE (exp))
8432 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
8433 layout_decl (exp, 0);
8435 /* TLS emulation hook - replace __thread vars with
8436 *__emutls_get_address (&_emutls.var). */
8437 if (! targetm.have_tls
8438 && TREE_CODE (exp) == VAR_DECL
8439 && DECL_THREAD_LOCAL_P (exp))
8441 exp = build_fold_indirect_ref_loc (loc, emutls_var_address (exp));
8442 return expand_expr_real_1 (exp, target, tmode, modifier, NULL);
8445 /* ... fall through ... */
8449 decl_rtl = DECL_RTL (exp);
8451 gcc_assert (decl_rtl);
8452 decl_rtl = copy_rtx (decl_rtl);
8454 /* Ensure variable marked as used even if it doesn't go through
8455 a parser. If it hasn't be used yet, write out an external
8457 if (! TREE_USED (exp))
8459 assemble_external (exp);
8460 TREE_USED (exp) = 1;
8463 /* Show we haven't gotten RTL for this yet. */
8466 /* Variables inherited from containing functions should have
8467 been lowered by this point. */
8468 context = decl_function_context (exp);
8469 gcc_assert (!context
8470 || context == current_function_decl
8471 || TREE_STATIC (exp)
8472 /* ??? C++ creates functions that are not TREE_STATIC. */
8473 || TREE_CODE (exp) == FUNCTION_DECL);
8475 /* This is the case of an array whose size is to be determined
8476 from its initializer, while the initializer is still being parsed.
8479 if (MEM_P (decl_rtl) && REG_P (XEXP (decl_rtl, 0)))
8480 temp = validize_mem (decl_rtl);
8482 /* If DECL_RTL is memory, we are in the normal case and the
8483 address is not valid, get the address into a register. */
8485 else if (MEM_P (decl_rtl) && modifier != EXPAND_INITIALIZER)
8488 *alt_rtl = decl_rtl;
8489 decl_rtl = use_anchored_address (decl_rtl);
8490 if (modifier != EXPAND_CONST_ADDRESS
8491 && modifier != EXPAND_SUM
8492 && !memory_address_addr_space_p (DECL_MODE (exp),
8494 MEM_ADDR_SPACE (decl_rtl)))
8495 temp = replace_equiv_address (decl_rtl,
8496 copy_rtx (XEXP (decl_rtl, 0)));
8499 /* If we got something, return it. But first, set the alignment
8500 if the address is a register. */
8503 if (MEM_P (temp) && REG_P (XEXP (temp, 0)))
8504 mark_reg_pointer (XEXP (temp, 0), DECL_ALIGN (exp));
8509 /* If the mode of DECL_RTL does not match that of the decl, it
8510 must be a promoted value. We return a SUBREG of the wanted mode,
8511 but mark it so that we know that it was already extended. */
8513 if (REG_P (decl_rtl)
8514 && GET_MODE (decl_rtl) != DECL_MODE (exp))
8516 enum machine_mode pmode;
8518 /* Get the signedness used for this variable. Ensure we get the
8519 same mode we got when the variable was declared. */
8520 pmode = promote_decl_mode (exp, &unsignedp);
8521 gcc_assert (GET_MODE (decl_rtl) == pmode);
8523 temp = gen_lowpart_SUBREG (mode, decl_rtl);
8524 SUBREG_PROMOTED_VAR_P (temp) = 1;
8525 SUBREG_PROMOTED_UNSIGNED_SET (temp, unsignedp);
8532 temp = immed_double_const (TREE_INT_CST_LOW (exp),
8533 TREE_INT_CST_HIGH (exp), mode);
8539 tree tmp = NULL_TREE;
8540 if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT
8541 || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT
8542 || GET_MODE_CLASS (mode) == MODE_VECTOR_FRACT
8543 || GET_MODE_CLASS (mode) == MODE_VECTOR_UFRACT
8544 || GET_MODE_CLASS (mode) == MODE_VECTOR_ACCUM
8545 || GET_MODE_CLASS (mode) == MODE_VECTOR_UACCUM)
8546 return const_vector_from_tree (exp);
8547 if (GET_MODE_CLASS (mode) == MODE_INT)
8549 tree type_for_mode = lang_hooks.types.type_for_mode (mode, 1);
8551 tmp = fold_unary_loc (loc, VIEW_CONVERT_EXPR, type_for_mode, exp);
8554 tmp = build_constructor_from_list (type,
8555 TREE_VECTOR_CST_ELTS (exp));
8556 return expand_expr (tmp, ignore ? const0_rtx : target,
8561 return expand_expr (DECL_INITIAL (exp), target, VOIDmode, modifier);
8564 /* If optimized, generate immediate CONST_DOUBLE
8565 which will be turned into memory by reload if necessary.
8567 We used to force a register so that loop.c could see it. But
8568 this does not allow gen_* patterns to perform optimizations with
8569 the constants. It also produces two insns in cases like "x = 1.0;".
8570 On most machines, floating-point constants are not permitted in
8571 many insns, so we'd end up copying it to a register in any case.
8573 Now, we do the copying in expand_binop, if appropriate. */
8574 return CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (exp),
8575 TYPE_MODE (TREE_TYPE (exp)));
8578 return CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (exp),
8579 TYPE_MODE (TREE_TYPE (exp)));
8582 /* Handle evaluating a complex constant in a CONCAT target. */
8583 if (original_target && GET_CODE (original_target) == CONCAT)
8585 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
8588 rtarg = XEXP (original_target, 0);
8589 itarg = XEXP (original_target, 1);
8591 /* Move the real and imaginary parts separately. */
8592 op0 = expand_expr (TREE_REALPART (exp), rtarg, mode, EXPAND_NORMAL);
8593 op1 = expand_expr (TREE_IMAGPART (exp), itarg, mode, EXPAND_NORMAL);
8596 emit_move_insn (rtarg, op0);
8598 emit_move_insn (itarg, op1);
8600 return original_target;
8603 /* ... fall through ... */
8606 temp = expand_expr_constant (exp, 1, modifier);
8608 /* temp contains a constant address.
8609 On RISC machines where a constant address isn't valid,
8610 make some insns to get that address into a register. */
8611 if (modifier != EXPAND_CONST_ADDRESS
8612 && modifier != EXPAND_INITIALIZER
8613 && modifier != EXPAND_SUM
8614 && ! memory_address_addr_space_p (mode, XEXP (temp, 0),
8615 MEM_ADDR_SPACE (temp)))
8616 return replace_equiv_address (temp,
8617 copy_rtx (XEXP (temp, 0)));
8623 rtx ret = expand_expr_real_1 (val, target, tmode, modifier, alt_rtl);
8625 if (!SAVE_EXPR_RESOLVED_P (exp))
8627 /* We can indeed still hit this case, typically via builtin
8628 expanders calling save_expr immediately before expanding
8629 something. Assume this means that we only have to deal
8630 with non-BLKmode values. */
8631 gcc_assert (GET_MODE (ret) != BLKmode);
8633 val = build_decl (EXPR_LOCATION (exp),
8634 VAR_DECL, NULL, TREE_TYPE (exp));
8635 DECL_ARTIFICIAL (val) = 1;
8636 DECL_IGNORED_P (val) = 1;
8638 TREE_OPERAND (exp, 0) = treeop0;
8639 SAVE_EXPR_RESOLVED_P (exp) = 1;
8641 if (!CONSTANT_P (ret))
8642 ret = copy_to_reg (ret);
8643 SET_DECL_RTL (val, ret);
8651 /* If we don't need the result, just ensure we evaluate any
8655 unsigned HOST_WIDE_INT idx;
8658 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
8659 expand_expr (value, const0_rtx, VOIDmode, EXPAND_NORMAL);
8664 return expand_constructor (exp, target, modifier, false);
8666 case MISALIGNED_INDIRECT_REF:
8667 case ALIGN_INDIRECT_REF:
8670 tree exp1 = treeop0;
8671 addr_space_t as = ADDR_SPACE_GENERIC;
8672 enum machine_mode address_mode = Pmode;
8674 if (modifier != EXPAND_WRITE)
8678 t = fold_read_from_constant_string (exp);
8680 return expand_expr (t, target, tmode, modifier);
8683 if (POINTER_TYPE_P (TREE_TYPE (exp1)))
8685 as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp1)));
8686 address_mode = targetm.addr_space.address_mode (as);
8689 op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
8690 op0 = memory_address_addr_space (mode, op0, as);
8692 if (code == ALIGN_INDIRECT_REF)
8694 int align = TYPE_ALIGN_UNIT (type);
8695 op0 = gen_rtx_AND (address_mode, op0, GEN_INT (-align));
8696 op0 = memory_address_addr_space (mode, op0, as);
8699 temp = gen_rtx_MEM (mode, op0);
8701 set_mem_attributes (temp, exp, 0);
8702 set_mem_addr_space (temp, as);
8704 /* Resolve the misalignment now, so that we don't have to remember
8705 to resolve it later. Of course, this only works for reads. */
8706 if (code == MISALIGNED_INDIRECT_REF)
8711 gcc_assert (modifier == EXPAND_NORMAL
8712 || modifier == EXPAND_STACK_PARM);
8714 /* The vectorizer should have already checked the mode. */
8715 icode = optab_handler (movmisalign_optab, mode)->insn_code;
8716 gcc_assert (icode != CODE_FOR_nothing);
8718 /* We've already validated the memory, and we're creating a
8719 new pseudo destination. The predicates really can't fail. */
8720 reg = gen_reg_rtx (mode);
8722 /* Nor can the insn generator. */
8723 insn = GEN_FCN (icode) (reg, temp);
8732 case TARGET_MEM_REF:
8734 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (exp));
8735 struct mem_address addr;
8738 get_address_description (exp, &addr);
8739 op0 = addr_for_mem_ref (&addr, as, true);
8740 op0 = memory_address_addr_space (mode, op0, as);
8741 temp = gen_rtx_MEM (mode, op0);
8742 set_mem_attributes (temp, TMR_ORIGINAL (exp), 0);
8743 set_mem_addr_space (temp, as);
8744 base = get_base_address (TMR_ORIGINAL (exp));
8745 if (INDIRECT_REF_P (base)
8747 && TREE_CODE (TMR_BASE (exp)) == SSA_NAME
8748 && POINTER_TYPE_P (TREE_TYPE (TMR_BASE (exp))))
8750 set_mem_expr (temp, build1 (INDIRECT_REF,
8751 TREE_TYPE (exp), TMR_BASE (exp)));
8752 set_mem_offset (temp, NULL_RTX);
8760 tree array = treeop0;
8761 tree index = treeop1;
8763 /* Fold an expression like: "foo"[2].
8764 This is not done in fold so it won't happen inside &.
8765 Don't fold if this is for wide characters since it's too
8766 difficult to do correctly and this is a very rare case. */
8768 if (modifier != EXPAND_CONST_ADDRESS
8769 && modifier != EXPAND_INITIALIZER
8770 && modifier != EXPAND_MEMORY)
8772 tree t = fold_read_from_constant_string (exp);
8775 return expand_expr (t, target, tmode, modifier);
8778 /* If this is a constant index into a constant array,
8779 just get the value from the array. Handle both the cases when
8780 we have an explicit constructor and when our operand is a variable
8781 that was declared const. */
8783 if (modifier != EXPAND_CONST_ADDRESS
8784 && modifier != EXPAND_INITIALIZER
8785 && modifier != EXPAND_MEMORY
8786 && TREE_CODE (array) == CONSTRUCTOR
8787 && ! TREE_SIDE_EFFECTS (array)
8788 && TREE_CODE (index) == INTEGER_CST)
8790 unsigned HOST_WIDE_INT ix;
8793 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (array), ix,
8795 if (tree_int_cst_equal (field, index))
8797 if (!TREE_SIDE_EFFECTS (value))
8798 return expand_expr (fold (value), target, tmode, modifier);
8803 else if (optimize >= 1
8804 && modifier != EXPAND_CONST_ADDRESS
8805 && modifier != EXPAND_INITIALIZER
8806 && modifier != EXPAND_MEMORY
8807 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
8808 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
8809 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK
8810 && targetm.binds_local_p (array))
8812 if (TREE_CODE (index) == INTEGER_CST)
8814 tree init = DECL_INITIAL (array);
8816 if (TREE_CODE (init) == CONSTRUCTOR)
8818 unsigned HOST_WIDE_INT ix;
8821 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (init), ix,
8823 if (tree_int_cst_equal (field, index))
8825 if (TREE_SIDE_EFFECTS (value))
8828 if (TREE_CODE (value) == CONSTRUCTOR)
8830 /* If VALUE is a CONSTRUCTOR, this
8831 optimization is only useful if
8832 this doesn't store the CONSTRUCTOR
8833 into memory. If it does, it is more
8834 efficient to just load the data from
8835 the array directly. */
8836 rtx ret = expand_constructor (value, target,
8838 if (ret == NULL_RTX)
8842 return expand_expr (fold (value), target, tmode,
8846 else if(TREE_CODE (init) == STRING_CST)
8848 tree index1 = index;
8849 tree low_bound = array_ref_low_bound (exp);
8850 index1 = fold_convert_loc (loc, sizetype,
8853 /* Optimize the special-case of a zero lower bound.
8855 We convert the low_bound to sizetype to avoid some problems
8856 with constant folding. (E.g. suppose the lower bound is 1,
8857 and its mode is QI. Without the conversion,l (ARRAY
8858 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
8859 +INDEX), which becomes (ARRAY+255+INDEX). Opps!) */
8861 if (! integer_zerop (low_bound))
8862 index1 = size_diffop_loc (loc, index1,
8863 fold_convert_loc (loc, sizetype,
8866 if (0 > compare_tree_int (index1,
8867 TREE_STRING_LENGTH (init)))
8869 tree type = TREE_TYPE (TREE_TYPE (init));
8870 enum machine_mode mode = TYPE_MODE (type);
8872 if (GET_MODE_CLASS (mode) == MODE_INT
8873 && GET_MODE_SIZE (mode) == 1)
8874 return gen_int_mode (TREE_STRING_POINTER (init)
8875 [TREE_INT_CST_LOW (index1)],
8882 goto normal_inner_ref;
8885 /* If the operand is a CONSTRUCTOR, we can just extract the
8886 appropriate field if it is present. */
8887 if (TREE_CODE (treeop0) == CONSTRUCTOR)
8889 unsigned HOST_WIDE_INT idx;
8892 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (treeop0),
8894 if (field == treeop1
8895 /* We can normally use the value of the field in the
8896 CONSTRUCTOR. However, if this is a bitfield in
8897 an integral mode that we can fit in a HOST_WIDE_INT,
8898 we must mask only the number of bits in the bitfield,
8899 since this is done implicitly by the constructor. If
8900 the bitfield does not meet either of those conditions,
8901 we can't do this optimization. */
8902 && (! DECL_BIT_FIELD (field)
8903 || ((GET_MODE_CLASS (DECL_MODE (field)) == MODE_INT)
8904 && (GET_MODE_BITSIZE (DECL_MODE (field))
8905 <= HOST_BITS_PER_WIDE_INT))))
8907 if (DECL_BIT_FIELD (field)
8908 && modifier == EXPAND_STACK_PARM)
8910 op0 = expand_expr (value, target, tmode, modifier);
8911 if (DECL_BIT_FIELD (field))
8913 HOST_WIDE_INT bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
8914 enum machine_mode imode = TYPE_MODE (TREE_TYPE (field));
8916 if (TYPE_UNSIGNED (TREE_TYPE (field)))
8918 op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
8919 op0 = expand_and (imode, op0, op1, target);
8924 = build_int_cst (NULL_TREE,
8925 GET_MODE_BITSIZE (imode) - bitsize);
8927 op0 = expand_shift (LSHIFT_EXPR, imode, op0, count,
8929 op0 = expand_shift (RSHIFT_EXPR, imode, op0, count,
8937 goto normal_inner_ref;
8940 case ARRAY_RANGE_REF:
8943 enum machine_mode mode1, mode2;
8944 HOST_WIDE_INT bitsize, bitpos;
8946 int volatilep = 0, must_force_mem;
8947 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
8948 &mode1, &unsignedp, &volatilep, true);
8949 rtx orig_op0, memloc;
8951 /* If we got back the original object, something is wrong. Perhaps
8952 we are evaluating an expression too early. In any event, don't
8953 infinitely recurse. */
8954 gcc_assert (tem != exp);
8956 /* If TEM's type is a union of variable size, pass TARGET to the inner
8957 computation, since it will need a temporary and TARGET is known
8958 to have to do. This occurs in unchecked conversion in Ada. */
8961 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
8962 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
8964 && modifier != EXPAND_STACK_PARM
8965 ? target : NULL_RTX),
8967 (modifier == EXPAND_INITIALIZER
8968 || modifier == EXPAND_CONST_ADDRESS
8969 || modifier == EXPAND_STACK_PARM)
8970 ? modifier : EXPAND_NORMAL);
8973 = CONSTANT_P (op0) ? TYPE_MODE (TREE_TYPE (tem)) : GET_MODE (op0);
8975 /* If we have either an offset, a BLKmode result, or a reference
8976 outside the underlying object, we must force it to memory.
8977 Such a case can occur in Ada if we have unchecked conversion
8978 of an expression from a scalar type to an aggregate type or
8979 for an ARRAY_RANGE_REF whose type is BLKmode, or if we were
8980 passed a partially uninitialized object or a view-conversion
8981 to a larger size. */
8982 must_force_mem = (offset
8984 || bitpos + bitsize > GET_MODE_BITSIZE (mode2));
8986 /* Handle CONCAT first. */
8987 if (GET_CODE (op0) == CONCAT && !must_force_mem)
8990 && bitsize == GET_MODE_BITSIZE (GET_MODE (op0)))
8993 && bitsize == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 0)))
8996 op0 = XEXP (op0, 0);
8997 mode2 = GET_MODE (op0);
8999 else if (bitpos == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 0)))
9000 && bitsize == GET_MODE_BITSIZE (GET_MODE (XEXP (op0, 1)))
9004 op0 = XEXP (op0, 1);
9006 mode2 = GET_MODE (op0);
9009 /* Otherwise force into memory. */
9013 /* If this is a constant, put it in a register if it is a legitimate
9014 constant and we don't need a memory reference. */
9015 if (CONSTANT_P (op0)
9017 && LEGITIMATE_CONSTANT_P (op0)
9019 op0 = force_reg (mode2, op0);
9021 /* Otherwise, if this is a constant, try to force it to the constant
9022 pool. Note that back-ends, e.g. MIPS, may refuse to do so if it
9023 is a legitimate constant. */
9024 else if (CONSTANT_P (op0) && (memloc = force_const_mem (mode2, op0)))
9025 op0 = validize_mem (memloc);
9027 /* Otherwise, if this is a constant or the object is not in memory
9028 and need be, put it there. */
9029 else if (CONSTANT_P (op0) || (!MEM_P (op0) && must_force_mem))
9031 tree nt = build_qualified_type (TREE_TYPE (tem),
9032 (TYPE_QUALS (TREE_TYPE (tem))
9033 | TYPE_QUAL_CONST));
9034 memloc = assign_temp (nt, 1, 1, 1);
9035 emit_move_insn (memloc, op0);
9041 enum machine_mode address_mode;
9042 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode,
9045 gcc_assert (MEM_P (op0));
9048 = targetm.addr_space.address_mode (MEM_ADDR_SPACE (op0));
9049 if (GET_MODE (offset_rtx) != address_mode)
9050 offset_rtx = convert_to_mode (address_mode, offset_rtx, 0);
9052 if (GET_MODE (op0) == BLKmode
9053 /* A constant address in OP0 can have VOIDmode, we must
9054 not try to call force_reg in that case. */
9055 && GET_MODE (XEXP (op0, 0)) != VOIDmode
9057 && (bitpos % bitsize) == 0
9058 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
9059 && MEM_ALIGN (op0) == GET_MODE_ALIGNMENT (mode1))
9061 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
9065 op0 = offset_address (op0, offset_rtx,
9066 highest_pow2_factor (offset));
9069 /* If OFFSET is making OP0 more aligned than BIGGEST_ALIGNMENT,
9070 record its alignment as BIGGEST_ALIGNMENT. */
9071 if (MEM_P (op0) && bitpos == 0 && offset != 0
9072 && is_aligning_offset (offset, tem))
9073 set_mem_align (op0, BIGGEST_ALIGNMENT);
9075 /* Don't forget about volatility even if this is a bitfield. */
9076 if (MEM_P (op0) && volatilep && ! MEM_VOLATILE_P (op0))
9078 if (op0 == orig_op0)
9079 op0 = copy_rtx (op0);
9081 MEM_VOLATILE_P (op0) = 1;
9084 /* In cases where an aligned union has an unaligned object
9085 as a field, we might be extracting a BLKmode value from
9086 an integer-mode (e.g., SImode) object. Handle this case
9087 by doing the extract into an object as wide as the field
9088 (which we know to be the width of a basic mode), then
9089 storing into memory, and changing the mode to BLKmode. */
9090 if (mode1 == VOIDmode
9091 || REG_P (op0) || GET_CODE (op0) == SUBREG
9092 || (mode1 != BLKmode && ! direct_load[(int) mode1]
9093 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
9094 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT
9095 && modifier != EXPAND_CONST_ADDRESS
9096 && modifier != EXPAND_INITIALIZER)
9097 /* If the field isn't aligned enough to fetch as a memref,
9098 fetch it as a bit field. */
9099 || (mode1 != BLKmode
9100 && (((TYPE_ALIGN (TREE_TYPE (tem)) < GET_MODE_ALIGNMENT (mode)
9101 || (bitpos % GET_MODE_ALIGNMENT (mode) != 0)
9103 && (MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode1)
9104 || (bitpos % GET_MODE_ALIGNMENT (mode1) != 0))))
9105 && ((modifier == EXPAND_CONST_ADDRESS
9106 || modifier == EXPAND_INITIALIZER)
9108 : SLOW_UNALIGNED_ACCESS (mode1, MEM_ALIGN (op0))))
9109 || (bitpos % BITS_PER_UNIT != 0)))
9110 /* If the type and the field are a constant size and the
9111 size of the type isn't the same size as the bitfield,
9112 we must use bitfield operations. */
9114 && TYPE_SIZE (TREE_TYPE (exp))
9115 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
9116 && 0 != compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)),
9119 enum machine_mode ext_mode = mode;
9121 if (ext_mode == BLKmode
9122 && ! (target != 0 && MEM_P (op0)
9124 && bitpos % BITS_PER_UNIT == 0))
9125 ext_mode = mode_for_size (bitsize, MODE_INT, 1);
9127 if (ext_mode == BLKmode)
9130 target = assign_temp (type, 0, 1, 1);
9135 /* In this case, BITPOS must start at a byte boundary and
9136 TARGET, if specified, must be a MEM. */
9137 gcc_assert (MEM_P (op0)
9138 && (!target || MEM_P (target))
9139 && !(bitpos % BITS_PER_UNIT));
9141 emit_block_move (target,
9142 adjust_address (op0, VOIDmode,
9143 bitpos / BITS_PER_UNIT),
9144 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
9146 (modifier == EXPAND_STACK_PARM
9147 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
9152 op0 = validize_mem (op0);
9154 if (MEM_P (op0) && REG_P (XEXP (op0, 0)))
9155 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
9157 op0 = extract_bit_field (op0, bitsize, bitpos, unsignedp,
9158 (modifier == EXPAND_STACK_PARM
9159 ? NULL_RTX : target),
9160 ext_mode, ext_mode);
9162 /* If the result is a record type and BITSIZE is narrower than
9163 the mode of OP0, an integral mode, and this is a big endian
9164 machine, we must put the field into the high-order bits. */
9165 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
9166 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
9167 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (op0)))
9168 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
9169 size_int (GET_MODE_BITSIZE (GET_MODE (op0))
9173 /* If the result type is BLKmode, store the data into a temporary
9174 of the appropriate type, but with the mode corresponding to the
9175 mode for the data we have (op0's mode). It's tempting to make
9176 this a constant type, since we know it's only being stored once,
9177 but that can cause problems if we are taking the address of this
9178 COMPONENT_REF because the MEM of any reference via that address
9179 will have flags corresponding to the type, which will not
9180 necessarily be constant. */
9181 if (mode == BLKmode)
9183 HOST_WIDE_INT size = GET_MODE_BITSIZE (ext_mode);
9186 /* If the reference doesn't use the alias set of its type,
9187 we cannot create the temporary using that type. */
9188 if (component_uses_parent_alias_set (exp))
9190 new_rtx = assign_stack_local (ext_mode, size, 0);
9191 set_mem_alias_set (new_rtx, get_alias_set (exp));
9194 new_rtx = assign_stack_temp_for_type (ext_mode, size, 0, type);
9196 emit_move_insn (new_rtx, op0);
9197 op0 = copy_rtx (new_rtx);
9198 PUT_MODE (op0, BLKmode);
9199 set_mem_attributes (op0, exp, 1);
9205 /* If the result is BLKmode, use that to access the object
9207 if (mode == BLKmode)
9210 /* Get a reference to just this component. */
9211 if (modifier == EXPAND_CONST_ADDRESS
9212 || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
9213 op0 = adjust_address_nv (op0, mode1, bitpos / BITS_PER_UNIT);
9215 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
9217 if (op0 == orig_op0)
9218 op0 = copy_rtx (op0);
9220 set_mem_attributes (op0, exp, 0);
9221 if (REG_P (XEXP (op0, 0)))
9222 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
9224 MEM_VOLATILE_P (op0) |= volatilep;
9225 if (mode == mode1 || mode1 == BLKmode || mode1 == tmode
9226 || modifier == EXPAND_CONST_ADDRESS
9227 || modifier == EXPAND_INITIALIZER)
9229 else if (target == 0)
9230 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
9232 convert_move (target, op0, unsignedp);
9237 return expand_expr (OBJ_TYPE_REF_EXPR (exp), target, tmode, modifier);
9240 /* All valid uses of __builtin_va_arg_pack () are removed during
9242 if (CALL_EXPR_VA_ARG_PACK (exp))
9243 error ("%Kinvalid use of %<__builtin_va_arg_pack ()%>", exp);
9245 tree fndecl = get_callee_fndecl (exp), attr;
9248 && (attr = lookup_attribute ("error",
9249 DECL_ATTRIBUTES (fndecl))) != NULL)
9250 error ("%Kcall to %qs declared with attribute error: %s",
9251 exp, identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 1)),
9252 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr))));
9254 && (attr = lookup_attribute ("warning",
9255 DECL_ATTRIBUTES (fndecl))) != NULL)
9256 warning_at (tree_nonartificial_location (exp),
9257 0, "%Kcall to %qs declared with attribute warning: %s",
9258 exp, identifier_to_locale (lang_hooks.decl_printable_name (fndecl, 1)),
9259 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr))));
9261 /* Check for a built-in function. */
9262 if (fndecl && DECL_BUILT_IN (fndecl))
9264 gcc_assert (DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_FRONTEND);
9265 return expand_builtin (exp, target, subtarget, tmode, ignore);
9268 return expand_call (exp, target, ignore);
9270 case VIEW_CONVERT_EXPR:
9273 /* If we are converting to BLKmode, try to avoid an intermediate
9274 temporary by fetching an inner memory reference. */
9276 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
9277 && TYPE_MODE (TREE_TYPE (treeop0)) != BLKmode
9278 && handled_component_p (treeop0))
9280 enum machine_mode mode1;
9281 HOST_WIDE_INT bitsize, bitpos;
9286 = get_inner_reference (treeop0, &bitsize, &bitpos,
9287 &offset, &mode1, &unsignedp, &volatilep,
9291 /* ??? We should work harder and deal with non-zero offsets. */
9293 && (bitpos % BITS_PER_UNIT) == 0
9295 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) == 0)
9297 /* See the normal_inner_ref case for the rationale. */
9300 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
9301 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
9303 && modifier != EXPAND_STACK_PARM
9304 ? target : NULL_RTX),
9306 (modifier == EXPAND_INITIALIZER
9307 || modifier == EXPAND_CONST_ADDRESS
9308 || modifier == EXPAND_STACK_PARM)
9309 ? modifier : EXPAND_NORMAL);
9311 if (MEM_P (orig_op0))
9315 /* Get a reference to just this component. */
9316 if (modifier == EXPAND_CONST_ADDRESS
9317 || modifier == EXPAND_SUM
9318 || modifier == EXPAND_INITIALIZER)
9319 op0 = adjust_address_nv (op0, mode, bitpos / BITS_PER_UNIT);
9321 op0 = adjust_address (op0, mode, bitpos / BITS_PER_UNIT);
9323 if (op0 == orig_op0)
9324 op0 = copy_rtx (op0);
9326 set_mem_attributes (op0, treeop0, 0);
9327 if (REG_P (XEXP (op0, 0)))
9328 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
9330 MEM_VOLATILE_P (op0) |= volatilep;
9336 op0 = expand_expr (treeop0,
9337 NULL_RTX, VOIDmode, modifier);
9339 /* If the input and output modes are both the same, we are done. */
9340 if (mode == GET_MODE (op0))
9342 /* If neither mode is BLKmode, and both modes are the same size
9343 then we can use gen_lowpart. */
9344 else if (mode != BLKmode && GET_MODE (op0) != BLKmode
9345 && GET_MODE_SIZE (mode) == GET_MODE_SIZE (GET_MODE (op0))
9346 && !COMPLEX_MODE_P (GET_MODE (op0)))
9348 if (GET_CODE (op0) == SUBREG)
9349 op0 = force_reg (GET_MODE (op0), op0);
9350 op0 = gen_lowpart (mode, op0);
9352 /* If both modes are integral, then we can convert from one to the
9354 else if (SCALAR_INT_MODE_P (GET_MODE (op0)) && SCALAR_INT_MODE_P (mode))
9355 op0 = convert_modes (mode, GET_MODE (op0), op0,
9356 TYPE_UNSIGNED (TREE_TYPE (treeop0)));
9357 /* As a last resort, spill op0 to memory, and reload it in a
9359 else if (!MEM_P (op0))
9361 /* If the operand is not a MEM, force it into memory. Since we
9362 are going to be changing the mode of the MEM, don't call
9363 force_const_mem for constants because we don't allow pool
9364 constants to change mode. */
9365 tree inner_type = TREE_TYPE (treeop0);
9367 gcc_assert (!TREE_ADDRESSABLE (exp));
9369 if (target == 0 || GET_MODE (target) != TYPE_MODE (inner_type))
9371 = assign_stack_temp_for_type
9372 (TYPE_MODE (inner_type),
9373 GET_MODE_SIZE (TYPE_MODE (inner_type)), 0, inner_type);
9375 emit_move_insn (target, op0);
9379 /* At this point, OP0 is in the correct mode. If the output type is
9380 such that the operand is known to be aligned, indicate that it is.
9381 Otherwise, we need only be concerned about alignment for non-BLKmode
9385 op0 = copy_rtx (op0);
9387 if (TYPE_ALIGN_OK (type))
9388 set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type)));
9389 else if (STRICT_ALIGNMENT
9391 && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode))
9393 tree inner_type = TREE_TYPE (treeop0);
9394 HOST_WIDE_INT temp_size
9395 = MAX (int_size_in_bytes (inner_type),
9396 (HOST_WIDE_INT) GET_MODE_SIZE (mode));
9398 = assign_stack_temp_for_type (mode, temp_size, 0, type);
9399 rtx new_with_op0_mode
9400 = adjust_address (new_rtx, GET_MODE (op0), 0);
9402 gcc_assert (!TREE_ADDRESSABLE (exp));
9404 if (GET_MODE (op0) == BLKmode)
9405 emit_block_move (new_with_op0_mode, op0,
9406 GEN_INT (GET_MODE_SIZE (mode)),
9407 (modifier == EXPAND_STACK_PARM
9408 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
9410 emit_move_insn (new_with_op0_mode, op0);
9415 op0 = adjust_address (op0, mode, 0);
9420 /* Use a compare and a jump for BLKmode comparisons, or for function
9421 type comparisons is HAVE_canonicalize_funcptr_for_compare. */
9423 /* Although TRUTH_{AND,OR}IF_EXPR aren't present in GIMPLE, they
9424 are occassionally created by folding during expansion. */
9425 case TRUTH_ANDIF_EXPR:
9426 case TRUTH_ORIF_EXPR:
9429 || modifier == EXPAND_STACK_PARM
9430 || ! safe_from_p (target, treeop0, 1)
9431 || ! safe_from_p (target, treeop1, 1)
9432 /* Make sure we don't have a hard reg (such as function's return
9433 value) live across basic blocks, if not optimizing. */
9434 || (!optimize && REG_P (target)
9435 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
9436 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
9439 emit_move_insn (target, const0_rtx);
9441 op1 = gen_label_rtx ();
9442 jumpifnot_1 (code, treeop0, treeop1, op1, -1);
9445 emit_move_insn (target, const1_rtx);
9448 return ignore ? const0_rtx : target;
9450 case STATEMENT_LIST:
9452 tree_stmt_iterator iter;
9454 gcc_assert (ignore);
9456 for (iter = tsi_start (exp); !tsi_end_p (iter); tsi_next (&iter))
9457 expand_expr (tsi_stmt (iter), const0_rtx, VOIDmode, modifier);
9462 /* A COND_EXPR with its type being VOID_TYPE represents a
9463 conditional jump and is handled in
9464 expand_gimple_cond_expr. */
9465 gcc_assert (!VOID_TYPE_P (type));
9467 /* Note that COND_EXPRs whose type is a structure or union
9468 are required to be constructed to contain assignments of
9469 a temporary variable, so that we can evaluate them here
9470 for side effect only. If type is void, we must do likewise. */
9472 gcc_assert (!TREE_ADDRESSABLE (type)
9474 && TREE_TYPE (treeop1) != void_type_node
9475 && TREE_TYPE (treeop2) != void_type_node);
9477 /* If we are not to produce a result, we have no target. Otherwise,
9478 if a target was specified use it; it will not be used as an
9479 intermediate target unless it is safe. If no target, use a
9482 if (modifier != EXPAND_STACK_PARM
9484 && safe_from_p (original_target, treeop0, 1)
9485 && GET_MODE (original_target) == mode
9486 #ifdef HAVE_conditional_move
9487 && (! can_conditionally_move_p (mode)
9488 || REG_P (original_target))
9490 && !MEM_P (original_target))
9491 temp = original_target;
9493 temp = assign_temp (type, 0, 0, 1);
9495 do_pending_stack_adjust ();
9497 op0 = gen_label_rtx ();
9498 op1 = gen_label_rtx ();
9499 jumpifnot (treeop0, op0, -1);
9500 store_expr (treeop1, temp,
9501 modifier == EXPAND_STACK_PARM,
9504 emit_jump_insn (gen_jump (op1));
9507 store_expr (treeop2, temp,
9508 modifier == EXPAND_STACK_PARM,
9516 target = expand_vec_cond_expr (type, treeop0, treeop1, treeop2, target);
9523 gcc_assert (ignore);
9525 /* Check for |= or &= of a bitfield of size one into another bitfield
9526 of size 1. In this case, (unless we need the result of the
9527 assignment) we can do this more efficiently with a
9528 test followed by an assignment, if necessary.
9530 ??? At this point, we can't get a BIT_FIELD_REF here. But if
9531 things change so we do, this code should be enhanced to
9533 if (TREE_CODE (lhs) == COMPONENT_REF
9534 && (TREE_CODE (rhs) == BIT_IOR_EXPR
9535 || TREE_CODE (rhs) == BIT_AND_EXPR)
9536 && TREE_OPERAND (rhs, 0) == lhs
9537 && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
9538 && integer_onep (DECL_SIZE (TREE_OPERAND (lhs, 1)))
9539 && integer_onep (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))))
9541 rtx label = gen_label_rtx ();
9542 int value = TREE_CODE (rhs) == BIT_IOR_EXPR;
9543 do_jump (TREE_OPERAND (rhs, 1),
9545 value ? 0 : label, -1);
9546 expand_assignment (lhs, build_int_cst (TREE_TYPE (rhs), value),
9547 MOVE_NONTEMPORAL (exp));
9548 do_pending_stack_adjust ();
9553 expand_assignment (lhs, rhs, MOVE_NONTEMPORAL (exp));
9558 return expand_expr_addr_expr (exp, target, tmode, modifier);
9561 op0 = expand_normal (treeop0);
9562 return read_complex_part (op0, false);
9565 op0 = expand_normal (treeop0);
9566 return read_complex_part (op0, true);
9573 /* Expanded in cfgexpand.c. */
9576 case TRY_CATCH_EXPR:
9578 case EH_FILTER_EXPR:
9579 case TRY_FINALLY_EXPR:
9580 /* Lowered by tree-eh.c. */
9583 case WITH_CLEANUP_EXPR:
9584 case CLEANUP_POINT_EXPR:
9586 case CASE_LABEL_EXPR:
9592 case PREINCREMENT_EXPR:
9593 case PREDECREMENT_EXPR:
9594 case POSTINCREMENT_EXPR:
9595 case POSTDECREMENT_EXPR:
9598 /* Lowered by gimplify.c. */
9602 /* Function descriptors are not valid except for as
9603 initialization constants, and should not be expanded. */
9606 case WITH_SIZE_EXPR:
9607 /* WITH_SIZE_EXPR expands to its first argument. The caller should
9608 have pulled out the size to use in whatever context it needed. */
9609 return expand_expr_real (treeop0, original_target, tmode,
9612 case REALIGN_LOAD_EXPR:
9614 tree oprnd0 = treeop0;
9615 tree oprnd1 = treeop1;
9616 tree oprnd2 = treeop2;
9619 this_optab = optab_for_tree_code (code, type, optab_default);
9620 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
9621 op2 = expand_normal (oprnd2);
9622 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
9630 tree oprnd0 = treeop0;
9631 tree oprnd1 = treeop1;
9632 tree oprnd2 = treeop2;
9635 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
9636 op2 = expand_normal (oprnd2);
9637 target = expand_widen_pattern_expr (&ops, op0, op1, op2,
9642 case COMPOUND_LITERAL_EXPR:
9644 /* Initialize the anonymous variable declared in the compound
9645 literal, then return the variable. */
9646 tree decl = COMPOUND_LITERAL_EXPR_DECL (exp);
9648 /* Create RTL for this variable. */
9649 if (!DECL_RTL_SET_P (decl))
9651 if (DECL_HARD_REGISTER (decl))
9652 /* The user specified an assembler name for this variable.
9654 rest_of_decl_compilation (decl, 0, 0);
9659 return expand_expr_real (decl, original_target, tmode,
9664 return expand_expr_real_2 (&ops, target, tmode, modifier);
9668 /* Subroutine of above: reduce EXP to the precision of TYPE (in the
9669 signedness of TYPE), possibly returning the result in TARGET. */
9671 reduce_to_bit_field_precision (rtx exp, rtx target, tree type)
9673 HOST_WIDE_INT prec = TYPE_PRECISION (type);
9674 if (target && GET_MODE (target) != GET_MODE (exp))
9676 /* For constant values, reduce using build_int_cst_type. */
9677 if (CONST_INT_P (exp))
9679 HOST_WIDE_INT value = INTVAL (exp);
9680 tree t = build_int_cst_type (type, value);
9681 return expand_expr (t, target, VOIDmode, EXPAND_NORMAL);
9683 else if (TYPE_UNSIGNED (type))
9686 if (prec < HOST_BITS_PER_WIDE_INT)
9687 mask = immed_double_const (((unsigned HOST_WIDE_INT) 1 << prec) - 1, 0,
9690 mask = immed_double_const ((unsigned HOST_WIDE_INT) -1,
9691 ((unsigned HOST_WIDE_INT) 1
9692 << (prec - HOST_BITS_PER_WIDE_INT)) - 1,
9694 return expand_and (GET_MODE (exp), exp, mask, target);
9698 tree count = build_int_cst (NULL_TREE,
9699 GET_MODE_BITSIZE (GET_MODE (exp)) - prec);
9700 exp = expand_shift (LSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
9701 return expand_shift (RSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
9705 /* Subroutine of above: returns 1 if OFFSET corresponds to an offset that
9706 when applied to the address of EXP produces an address known to be
9707 aligned more than BIGGEST_ALIGNMENT. */
9710 is_aligning_offset (const_tree offset, const_tree exp)
9712 /* Strip off any conversions. */
9713 while (CONVERT_EXPR_P (offset))
9714 offset = TREE_OPERAND (offset, 0);
9716 /* We must now have a BIT_AND_EXPR with a constant that is one less than
9717 power of 2 and which is larger than BIGGEST_ALIGNMENT. */
9718 if (TREE_CODE (offset) != BIT_AND_EXPR
9719 || !host_integerp (TREE_OPERAND (offset, 1), 1)
9720 || compare_tree_int (TREE_OPERAND (offset, 1),
9721 BIGGEST_ALIGNMENT / BITS_PER_UNIT) <= 0
9722 || !exact_log2 (tree_low_cst (TREE_OPERAND (offset, 1), 1) + 1) < 0)
9725 /* Look at the first operand of BIT_AND_EXPR and strip any conversion.
9726 It must be NEGATE_EXPR. Then strip any more conversions. */
9727 offset = TREE_OPERAND (offset, 0);
9728 while (CONVERT_EXPR_P (offset))
9729 offset = TREE_OPERAND (offset, 0);
9731 if (TREE_CODE (offset) != NEGATE_EXPR)
9734 offset = TREE_OPERAND (offset, 0);
9735 while (CONVERT_EXPR_P (offset))
9736 offset = TREE_OPERAND (offset, 0);
9738 /* This must now be the address of EXP. */
9739 return TREE_CODE (offset) == ADDR_EXPR && TREE_OPERAND (offset, 0) == exp;
9742 /* Return the tree node if an ARG corresponds to a string constant or zero
9743 if it doesn't. If we return nonzero, set *PTR_OFFSET to the offset
9744 in bytes within the string that ARG is accessing. The type of the
9745 offset will be `sizetype'. */
9748 string_constant (tree arg, tree *ptr_offset)
9750 tree array, offset, lower_bound;
9753 if (TREE_CODE (arg) == ADDR_EXPR)
9755 if (TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
9757 *ptr_offset = size_zero_node;
9758 return TREE_OPERAND (arg, 0);
9760 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == VAR_DECL)
9762 array = TREE_OPERAND (arg, 0);
9763 offset = size_zero_node;
9765 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF)
9767 array = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
9768 offset = TREE_OPERAND (TREE_OPERAND (arg, 0), 1);
9769 if (TREE_CODE (array) != STRING_CST
9770 && TREE_CODE (array) != VAR_DECL)
9773 /* Check if the array has a nonzero lower bound. */
9774 lower_bound = array_ref_low_bound (TREE_OPERAND (arg, 0));
9775 if (!integer_zerop (lower_bound))
9777 /* If the offset and base aren't both constants, return 0. */
9778 if (TREE_CODE (lower_bound) != INTEGER_CST)
9780 if (TREE_CODE (offset) != INTEGER_CST)
9782 /* Adjust offset by the lower bound. */
9783 offset = size_diffop (fold_convert (sizetype, offset),
9784 fold_convert (sizetype, lower_bound));
9790 else if (TREE_CODE (arg) == PLUS_EXPR || TREE_CODE (arg) == POINTER_PLUS_EXPR)
9792 tree arg0 = TREE_OPERAND (arg, 0);
9793 tree arg1 = TREE_OPERAND (arg, 1);
9798 if (TREE_CODE (arg0) == ADDR_EXPR
9799 && (TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST
9800 || TREE_CODE (TREE_OPERAND (arg0, 0)) == VAR_DECL))
9802 array = TREE_OPERAND (arg0, 0);
9805 else if (TREE_CODE (arg1) == ADDR_EXPR
9806 && (TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST
9807 || TREE_CODE (TREE_OPERAND (arg1, 0)) == VAR_DECL))
9809 array = TREE_OPERAND (arg1, 0);
9818 if (TREE_CODE (array) == STRING_CST)
9820 *ptr_offset = fold_convert (sizetype, offset);
9823 else if (TREE_CODE (array) == VAR_DECL)
9827 /* Variables initialized to string literals can be handled too. */
9828 if (DECL_INITIAL (array) == NULL_TREE
9829 || TREE_CODE (DECL_INITIAL (array)) != STRING_CST)
9832 /* If they are read-only, non-volatile and bind locally. */
9833 if (! TREE_READONLY (array)
9834 || TREE_SIDE_EFFECTS (array)
9835 || ! targetm.binds_local_p (array))
9838 /* Avoid const char foo[4] = "abcde"; */
9839 if (DECL_SIZE_UNIT (array) == NULL_TREE
9840 || TREE_CODE (DECL_SIZE_UNIT (array)) != INTEGER_CST
9841 || (length = TREE_STRING_LENGTH (DECL_INITIAL (array))) <= 0
9842 || compare_tree_int (DECL_SIZE_UNIT (array), length) < 0)
9845 /* If variable is bigger than the string literal, OFFSET must be constant
9846 and inside of the bounds of the string literal. */
9847 offset = fold_convert (sizetype, offset);
9848 if (compare_tree_int (DECL_SIZE_UNIT (array), length) > 0
9849 && (! host_integerp (offset, 1)
9850 || compare_tree_int (offset, length) >= 0))
9853 *ptr_offset = offset;
9854 return DECL_INITIAL (array);
9860 /* Generate code to calculate OPS, and exploded expression
9861 using a store-flag instruction and return an rtx for the result.
9862 OPS reflects a comparison.
9864 If TARGET is nonzero, store the result there if convenient.
9866 Return zero if there is no suitable set-flag instruction
9867 available on this machine.
9869 Once expand_expr has been called on the arguments of the comparison,
9870 we are committed to doing the store flag, since it is not safe to
9871 re-evaluate the expression. We emit the store-flag insn by calling
9872 emit_store_flag, but only expand the arguments if we have a reason
9873 to believe that emit_store_flag will be successful. If we think that
9874 it will, but it isn't, we have to simulate the store-flag with a
9875 set/jump/set sequence. */
9878 do_store_flag (sepops ops, rtx target, enum machine_mode mode)
9881 tree arg0, arg1, type;
9883 enum machine_mode operand_mode;
9886 rtx subtarget = target;
9887 location_t loc = ops->location;
9892 /* Don't crash if the comparison was erroneous. */
9893 if (arg0 == error_mark_node || arg1 == error_mark_node)
9896 type = TREE_TYPE (arg0);
9897 operand_mode = TYPE_MODE (type);
9898 unsignedp = TYPE_UNSIGNED (type);
9900 /* We won't bother with BLKmode store-flag operations because it would mean
9901 passing a lot of information to emit_store_flag. */
9902 if (operand_mode == BLKmode)
9905 /* We won't bother with store-flag operations involving function pointers
9906 when function pointers must be canonicalized before comparisons. */
9907 #ifdef HAVE_canonicalize_funcptr_for_compare
9908 if (HAVE_canonicalize_funcptr_for_compare
9909 && ((TREE_CODE (TREE_TYPE (arg0)) == POINTER_TYPE
9910 && (TREE_CODE (TREE_TYPE (TREE_TYPE (arg0)))
9912 || (TREE_CODE (TREE_TYPE (arg1)) == POINTER_TYPE
9913 && (TREE_CODE (TREE_TYPE (TREE_TYPE (arg1)))
9914 == FUNCTION_TYPE))))
9921 /* Get the rtx comparison code to use. We know that EXP is a comparison
9922 operation of some type. Some comparisons against 1 and -1 can be
9923 converted to comparisons with zero. Do so here so that the tests
9924 below will be aware that we have a comparison with zero. These
9925 tests will not catch constants in the first operand, but constants
9926 are rarely passed as the first operand. */
9937 if (integer_onep (arg1))
9938 arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
9940 code = unsignedp ? LTU : LT;
9943 if (! unsignedp && integer_all_onesp (arg1))
9944 arg1 = integer_zero_node, code = LT;
9946 code = unsignedp ? LEU : LE;
9949 if (! unsignedp && integer_all_onesp (arg1))
9950 arg1 = integer_zero_node, code = GE;
9952 code = unsignedp ? GTU : GT;
9955 if (integer_onep (arg1))
9956 arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
9958 code = unsignedp ? GEU : GE;
9961 case UNORDERED_EXPR:
9990 /* Put a constant second. */
9991 if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST
9992 || TREE_CODE (arg0) == FIXED_CST)
9994 tem = arg0; arg0 = arg1; arg1 = tem;
9995 code = swap_condition (code);
9998 /* If this is an equality or inequality test of a single bit, we can
9999 do this by shifting the bit being tested to the low-order bit and
10000 masking the result with the constant 1. If the condition was EQ,
10001 we xor it with 1. This does not require an scc insn and is faster
10002 than an scc insn even if we have it.
10004 The code to make this transformation was moved into fold_single_bit_test,
10005 so we just call into the folder and expand its result. */
10007 if ((code == NE || code == EQ)
10008 && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
10009 && integer_pow2p (TREE_OPERAND (arg0, 1)))
10011 tree type = lang_hooks.types.type_for_mode (mode, unsignedp);
10012 return expand_expr (fold_single_bit_test (loc,
10013 code == NE ? NE_EXPR : EQ_EXPR,
10015 target, VOIDmode, EXPAND_NORMAL);
10018 if (! get_subtarget (target)
10019 || GET_MODE (subtarget) != operand_mode)
10022 expand_operands (arg0, arg1, subtarget, &op0, &op1, EXPAND_NORMAL);
10025 target = gen_reg_rtx (mode);
10027 /* Try a cstore if possible. */
10028 return emit_store_flag_force (target, code, op0, op1,
10029 operand_mode, unsignedp, 1);
10033 /* Stubs in case we haven't got a casesi insn. */
10034 #ifndef HAVE_casesi
10035 # define HAVE_casesi 0
10036 # define gen_casesi(a, b, c, d, e) (0)
10037 # define CODE_FOR_casesi CODE_FOR_nothing
10040 /* Attempt to generate a casesi instruction. Returns 1 if successful,
10041 0 otherwise (i.e. if there is no casesi instruction). */
10043 try_casesi (tree index_type, tree index_expr, tree minval, tree range,
10044 rtx table_label ATTRIBUTE_UNUSED, rtx default_label,
10045 rtx fallback_label ATTRIBUTE_UNUSED)
10047 enum machine_mode index_mode = SImode;
10048 int index_bits = GET_MODE_BITSIZE (index_mode);
10049 rtx op1, op2, index;
10050 enum machine_mode op_mode;
10055 /* Convert the index to SImode. */
10056 if (GET_MODE_BITSIZE (TYPE_MODE (index_type)) > GET_MODE_BITSIZE (index_mode))
10058 enum machine_mode omode = TYPE_MODE (index_type);
10059 rtx rangertx = expand_normal (range);
10061 /* We must handle the endpoints in the original mode. */
10062 index_expr = build2 (MINUS_EXPR, index_type,
10063 index_expr, minval);
10064 minval = integer_zero_node;
10065 index = expand_normal (index_expr);
10067 emit_cmp_and_jump_insns (rangertx, index, LTU, NULL_RTX,
10068 omode, 1, default_label);
10069 /* Now we can safely truncate. */
10070 index = convert_to_mode (index_mode, index, 0);
10074 if (TYPE_MODE (index_type) != index_mode)
10076 index_type = lang_hooks.types.type_for_size (index_bits, 0);
10077 index_expr = fold_convert (index_type, index_expr);
10080 index = expand_normal (index_expr);
10083 do_pending_stack_adjust ();
10085 op_mode = insn_data[(int) CODE_FOR_casesi].operand[0].mode;
10086 if (! (*insn_data[(int) CODE_FOR_casesi].operand[0].predicate)
10088 index = copy_to_mode_reg (op_mode, index);
10090 op1 = expand_normal (minval);
10092 op_mode = insn_data[(int) CODE_FOR_casesi].operand[1].mode;
10093 op1 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (minval)),
10094 op1, TYPE_UNSIGNED (TREE_TYPE (minval)));
10095 if (! (*insn_data[(int) CODE_FOR_casesi].operand[1].predicate)
10097 op1 = copy_to_mode_reg (op_mode, op1);
10099 op2 = expand_normal (range);
10101 op_mode = insn_data[(int) CODE_FOR_casesi].operand[2].mode;
10102 op2 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (range)),
10103 op2, TYPE_UNSIGNED (TREE_TYPE (range)));
10104 if (! (*insn_data[(int) CODE_FOR_casesi].operand[2].predicate)
10106 op2 = copy_to_mode_reg (op_mode, op2);
10108 emit_jump_insn (gen_casesi (index, op1, op2,
10109 table_label, !default_label
10110 ? fallback_label : default_label));
10114 /* Attempt to generate a tablejump instruction; same concept. */
10115 #ifndef HAVE_tablejump
10116 #define HAVE_tablejump 0
10117 #define gen_tablejump(x, y) (0)
10120 /* Subroutine of the next function.
10122 INDEX is the value being switched on, with the lowest value
10123 in the table already subtracted.
10124 MODE is its expected mode (needed if INDEX is constant).
10125 RANGE is the length of the jump table.
10126 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
10128 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
10129 index value is out of range. */
10132 do_tablejump (rtx index, enum machine_mode mode, rtx range, rtx table_label,
10137 if (INTVAL (range) > cfun->cfg->max_jumptable_ents)
10138 cfun->cfg->max_jumptable_ents = INTVAL (range);
10140 /* Do an unsigned comparison (in the proper mode) between the index
10141 expression and the value which represents the length of the range.
10142 Since we just finished subtracting the lower bound of the range
10143 from the index expression, this comparison allows us to simultaneously
10144 check that the original index expression value is both greater than
10145 or equal to the minimum value of the range and less than or equal to
10146 the maximum value of the range. */
10149 emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1,
10152 /* If index is in range, it must fit in Pmode.
10153 Convert to Pmode so we can index with it. */
10155 index = convert_to_mode (Pmode, index, 1);
10157 /* Don't let a MEM slip through, because then INDEX that comes
10158 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
10159 and break_out_memory_refs will go to work on it and mess it up. */
10160 #ifdef PIC_CASE_VECTOR_ADDRESS
10161 if (flag_pic && !REG_P (index))
10162 index = copy_to_mode_reg (Pmode, index);
10165 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
10166 GET_MODE_SIZE, because this indicates how large insns are. The other
10167 uses should all be Pmode, because they are addresses. This code
10168 could fail if addresses and insns are not the same size. */
10169 index = gen_rtx_PLUS (Pmode,
10170 gen_rtx_MULT (Pmode, index,
10171 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
10172 gen_rtx_LABEL_REF (Pmode, table_label));
10173 #ifdef PIC_CASE_VECTOR_ADDRESS
10175 index = PIC_CASE_VECTOR_ADDRESS (index);
10178 index = memory_address (CASE_VECTOR_MODE, index);
10179 temp = gen_reg_rtx (CASE_VECTOR_MODE);
10180 vector = gen_const_mem (CASE_VECTOR_MODE, index);
10181 convert_move (temp, vector, 0);
10183 emit_jump_insn (gen_tablejump (temp, table_label));
10185 /* If we are generating PIC code or if the table is PC-relative, the
10186 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
10187 if (! CASE_VECTOR_PC_RELATIVE && ! flag_pic)
10192 try_tablejump (tree index_type, tree index_expr, tree minval, tree range,
10193 rtx table_label, rtx default_label)
10197 if (! HAVE_tablejump)
10200 index_expr = fold_build2 (MINUS_EXPR, index_type,
10201 fold_convert (index_type, index_expr),
10202 fold_convert (index_type, minval));
10203 index = expand_normal (index_expr);
10204 do_pending_stack_adjust ();
10206 do_tablejump (index, TYPE_MODE (index_type),
10207 convert_modes (TYPE_MODE (index_type),
10208 TYPE_MODE (TREE_TYPE (range)),
10209 expand_normal (range),
10210 TYPE_UNSIGNED (TREE_TYPE (range))),
10211 table_label, default_label);
10215 /* Nonzero if the mode is a valid vector mode for this architecture.
10216 This returns nonzero even if there is no hardware support for the
10217 vector mode, but we can emulate with narrower modes. */
10220 vector_mode_valid_p (enum machine_mode mode)
10222 enum mode_class mclass = GET_MODE_CLASS (mode);
10223 enum machine_mode innermode;
10225 /* Doh! What's going on? */
10226 if (mclass != MODE_VECTOR_INT
10227 && mclass != MODE_VECTOR_FLOAT
10228 && mclass != MODE_VECTOR_FRACT
10229 && mclass != MODE_VECTOR_UFRACT
10230 && mclass != MODE_VECTOR_ACCUM
10231 && mclass != MODE_VECTOR_UACCUM)
10234 /* Hardware support. Woo hoo! */
10235 if (targetm.vector_mode_supported_p (mode))
10238 innermode = GET_MODE_INNER (mode);
10240 /* We should probably return 1 if requesting V4DI and we have no DI,
10241 but we have V2DI, but this is probably very unlikely. */
10243 /* If we have support for the inner mode, we can safely emulate it.
10244 We may not have V2DI, but me can emulate with a pair of DIs. */
10245 return targetm.scalar_mode_supported_p (innermode);
10248 /* Return a CONST_VECTOR rtx for a VECTOR_CST tree. */
10250 const_vector_from_tree (tree exp)
10255 enum machine_mode inner, mode;
10257 mode = TYPE_MODE (TREE_TYPE (exp));
10259 if (initializer_zerop (exp))
10260 return CONST0_RTX (mode);
10262 units = GET_MODE_NUNITS (mode);
10263 inner = GET_MODE_INNER (mode);
10265 v = rtvec_alloc (units);
10267 link = TREE_VECTOR_CST_ELTS (exp);
10268 for (i = 0; link; link = TREE_CHAIN (link), ++i)
10270 elt = TREE_VALUE (link);
10272 if (TREE_CODE (elt) == REAL_CST)
10273 RTVEC_ELT (v, i) = CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (elt),
10275 else if (TREE_CODE (elt) == FIXED_CST)
10276 RTVEC_ELT (v, i) = CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (elt),
10279 RTVEC_ELT (v, i) = immed_double_const (TREE_INT_CST_LOW (elt),
10280 TREE_INT_CST_HIGH (elt),
10284 /* Initialize remaining elements to 0. */
10285 for (; i < units; ++i)
10286 RTVEC_ELT (v, i) = CONST0_RTX (inner);
10288 return gen_rtx_CONST_VECTOR (mode, v);
10292 /* Build a decl for a EH personality function named NAME. */
10295 build_personality_function (const char *name)
10299 type = build_function_type_list (integer_type_node, integer_type_node,
10300 long_long_unsigned_type_node,
10301 ptr_type_node, ptr_type_node, NULL_TREE);
10302 decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
10303 get_identifier (name), type);
10304 DECL_ARTIFICIAL (decl) = 1;
10305 DECL_EXTERNAL (decl) = 1;
10306 TREE_PUBLIC (decl) = 1;
10308 /* Zap the nonsensical SYMBOL_REF_DECL for this. What we're left with
10309 are the flags assigned by targetm.encode_section_info. */
10310 SET_SYMBOL_REF_DECL (XEXP (DECL_RTL (decl), 0), NULL);
10315 /* Extracts the personality function of DECL and returns the corresponding
10319 get_personality_function (tree decl)
10321 tree personality = DECL_FUNCTION_PERSONALITY (decl);
10322 enum eh_personality_kind pk;
10324 pk = function_needs_eh_personality (DECL_STRUCT_FUNCTION (decl));
10325 if (pk == eh_personality_none)
10329 && pk == eh_personality_any)
10330 personality = lang_hooks.eh_personality ();
10332 if (pk == eh_personality_lang)
10333 gcc_assert (personality != NULL_TREE);
10335 return XEXP (DECL_RTL (personality), 0);
10338 #include "gt-expr.h"