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
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"
58 /* Decide whether a function's arguments should be processed
59 from first to last or from last to first.
61 They should if the stack and args grow in opposite directions, but
62 only if we have push insns. */
66 #ifndef PUSH_ARGS_REVERSED
67 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
68 #define PUSH_ARGS_REVERSED /* If it's last to first. */
74 #ifndef STACK_PUSH_CODE
75 #ifdef STACK_GROWS_DOWNWARD
76 #define STACK_PUSH_CODE PRE_DEC
78 #define STACK_PUSH_CODE PRE_INC
83 /* If this is nonzero, we do not bother generating VOLATILE
84 around volatile memory references, and we are willing to
85 output indirect addresses. If cse is to follow, we reject
86 indirect addresses so a useful potential cse is generated;
87 if it is used only once, instruction combination will produce
88 the same indirect address eventually. */
91 /* This structure is used by move_by_pieces to describe the move to
102 int explicit_inc_from;
103 unsigned HOST_WIDE_INT len;
104 HOST_WIDE_INT offset;
108 /* This structure is used by store_by_pieces to describe the clear to
111 struct store_by_pieces
117 unsigned HOST_WIDE_INT len;
118 HOST_WIDE_INT offset;
119 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode);
124 static unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
127 static void move_by_pieces_1 (rtx (*) (rtx, ...), enum machine_mode,
128 struct move_by_pieces *);
129 static bool block_move_libcall_safe_for_call_parm (void);
130 static bool emit_block_move_via_movmem (rtx, rtx, rtx, unsigned, unsigned, HOST_WIDE_INT);
131 static tree emit_block_move_libcall_fn (int);
132 static void emit_block_move_via_loop (rtx, rtx, rtx, unsigned);
133 static rtx clear_by_pieces_1 (void *, HOST_WIDE_INT, enum machine_mode);
134 static void clear_by_pieces (rtx, unsigned HOST_WIDE_INT, unsigned int);
135 static void store_by_pieces_1 (struct store_by_pieces *, unsigned int);
136 static void store_by_pieces_2 (rtx (*) (rtx, ...), enum machine_mode,
137 struct store_by_pieces *);
138 static tree clear_storage_libcall_fn (int);
139 static rtx compress_float_constant (rtx, rtx);
140 static rtx get_subtarget (rtx);
141 static void store_constructor_field (rtx, unsigned HOST_WIDE_INT,
142 HOST_WIDE_INT, enum machine_mode,
143 tree, tree, int, alias_set_type);
144 static void store_constructor (tree, rtx, int, HOST_WIDE_INT);
145 static rtx store_field (rtx, HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode,
146 tree, tree, alias_set_type, bool);
148 static unsigned HOST_WIDE_INT highest_pow2_factor_for_target (const_tree, const_tree);
150 static int is_aligning_offset (const_tree, const_tree);
151 static void expand_operands (tree, tree, rtx, rtx*, rtx*,
152 enum expand_modifier);
153 static rtx reduce_to_bit_field_precision (rtx, rtx, tree);
154 static rtx do_store_flag (tree, rtx, enum machine_mode, int);
156 static void emit_single_push_insn (enum machine_mode, rtx, tree);
158 static void do_tablejump (rtx, enum machine_mode, rtx, rtx, rtx);
159 static rtx const_vector_from_tree (tree);
160 static void write_complex_part (rtx, rtx, bool);
162 /* Record for each mode whether we can move a register directly to or
163 from an object of that mode in memory. If we can't, we won't try
164 to use that mode directly when accessing a field of that mode. */
166 static char direct_load[NUM_MACHINE_MODES];
167 static char direct_store[NUM_MACHINE_MODES];
169 /* Record for each mode whether we can float-extend from memory. */
171 static bool float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
173 /* This macro is used to determine whether move_by_pieces should be called
174 to perform a structure copy. */
175 #ifndef MOVE_BY_PIECES_P
176 #define MOVE_BY_PIECES_P(SIZE, ALIGN) \
177 (move_by_pieces_ninsns (SIZE, ALIGN, MOVE_MAX_PIECES + 1) \
178 < (unsigned int) MOVE_RATIO)
181 /* This macro is used to determine whether clear_by_pieces should be
182 called to clear storage. */
183 #ifndef CLEAR_BY_PIECES_P
184 #define CLEAR_BY_PIECES_P(SIZE, ALIGN) \
185 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
186 < (unsigned int) CLEAR_RATIO)
189 /* This macro is used to determine whether store_by_pieces should be
190 called to "memset" storage with byte values other than zero. */
191 #ifndef SET_BY_PIECES_P
192 #define SET_BY_PIECES_P(SIZE, ALIGN) \
193 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
194 < (unsigned int) SET_RATIO)
197 /* This macro is used to determine whether store_by_pieces should be
198 called to "memcpy" storage when the source is a constant string. */
199 #ifndef STORE_BY_PIECES_P
200 #define STORE_BY_PIECES_P(SIZE, ALIGN) \
201 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
202 < (unsigned int) MOVE_RATIO)
205 /* This array records the insn_code of insns to perform block moves. */
206 enum insn_code movmem_optab[NUM_MACHINE_MODES];
208 /* This array records the insn_code of insns to perform block sets. */
209 enum insn_code setmem_optab[NUM_MACHINE_MODES];
211 /* These arrays record the insn_code of three different kinds of insns
212 to perform block compares. */
213 enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
214 enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
215 enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
217 /* Synchronization primitives. */
218 enum insn_code sync_add_optab[NUM_MACHINE_MODES];
219 enum insn_code sync_sub_optab[NUM_MACHINE_MODES];
220 enum insn_code sync_ior_optab[NUM_MACHINE_MODES];
221 enum insn_code sync_and_optab[NUM_MACHINE_MODES];
222 enum insn_code sync_xor_optab[NUM_MACHINE_MODES];
223 enum insn_code sync_nand_optab[NUM_MACHINE_MODES];
224 enum insn_code sync_old_add_optab[NUM_MACHINE_MODES];
225 enum insn_code sync_old_sub_optab[NUM_MACHINE_MODES];
226 enum insn_code sync_old_ior_optab[NUM_MACHINE_MODES];
227 enum insn_code sync_old_and_optab[NUM_MACHINE_MODES];
228 enum insn_code sync_old_xor_optab[NUM_MACHINE_MODES];
229 enum insn_code sync_old_nand_optab[NUM_MACHINE_MODES];
230 enum insn_code sync_new_add_optab[NUM_MACHINE_MODES];
231 enum insn_code sync_new_sub_optab[NUM_MACHINE_MODES];
232 enum insn_code sync_new_ior_optab[NUM_MACHINE_MODES];
233 enum insn_code sync_new_and_optab[NUM_MACHINE_MODES];
234 enum insn_code sync_new_xor_optab[NUM_MACHINE_MODES];
235 enum insn_code sync_new_nand_optab[NUM_MACHINE_MODES];
236 enum insn_code sync_compare_and_swap[NUM_MACHINE_MODES];
237 enum insn_code sync_compare_and_swap_cc[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 (0, 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 (&rtl.expr, 0, sizeof (rtl.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);
560 emit_insn (gen_rtx_CLOBBER (VOIDmode, to));
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;
594 && insn_data[(int) CODE_FOR_slt].operand[0].mode == word_mode
595 && STORE_FLAG_VALUE == -1)
597 emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX,
599 fill_value = gen_reg_rtx (word_mode);
600 emit_insn (gen_slt (fill_value));
606 = expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom,
607 size_int (GET_MODE_BITSIZE (lowpart_mode) - 1),
609 fill_value = convert_to_mode (word_mode, fill_value, 1);
613 /* Fill the remaining words. */
614 for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
616 int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
617 rtx subword = operand_subword (to, index, 1, to_mode);
619 gcc_assert (subword);
621 if (fill_value != subword)
622 emit_move_insn (subword, fill_value);
625 insns = get_insns ();
628 emit_no_conflict_block (insns, to, from, NULL_RTX,
629 gen_rtx_fmt_e (equiv_code, to_mode, copy_rtx (from)));
633 /* Truncating multi-word to a word or less. */
634 if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
635 && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
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 convert_move (to, gen_lowpart (word_mode, from), 0);
648 /* Now follow all the conversions between integers
649 no more than a word long. */
651 /* For truncation, usually we can just refer to FROM in a narrower mode. */
652 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
653 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
654 GET_MODE_BITSIZE (from_mode)))
657 && ! MEM_VOLATILE_P (from)
658 && direct_load[(int) to_mode]
659 && ! mode_dependent_address_p (XEXP (from, 0)))
661 || GET_CODE (from) == SUBREG))
662 from = force_reg (from_mode, from);
663 if (REG_P (from) && REGNO (from) < FIRST_PSEUDO_REGISTER
664 && ! HARD_REGNO_MODE_OK (REGNO (from), to_mode))
665 from = copy_to_reg (from);
666 emit_move_insn (to, gen_lowpart (to_mode, from));
670 /* Handle extension. */
671 if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
673 /* Convert directly if that works. */
674 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
677 emit_unop_insn (code, to, from, equiv_code);
682 enum machine_mode intermediate;
686 /* Search for a mode to convert via. */
687 for (intermediate = from_mode; intermediate != VOIDmode;
688 intermediate = GET_MODE_WIDER_MODE (intermediate))
689 if (((can_extend_p (to_mode, intermediate, unsignedp)
691 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
692 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
693 GET_MODE_BITSIZE (intermediate))))
694 && (can_extend_p (intermediate, from_mode, unsignedp)
695 != CODE_FOR_nothing))
697 convert_move (to, convert_to_mode (intermediate, from,
698 unsignedp), unsignedp);
702 /* No suitable intermediate mode.
703 Generate what we need with shifts. */
704 shift_amount = build_int_cst (NULL_TREE,
705 GET_MODE_BITSIZE (to_mode)
706 - GET_MODE_BITSIZE (from_mode));
707 from = gen_lowpart (to_mode, force_reg (from_mode, from));
708 tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount,
710 tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount,
713 emit_move_insn (to, tmp);
718 /* Support special truncate insns for certain modes. */
719 if (convert_optab_handler (trunc_optab, to_mode, from_mode)->insn_code != CODE_FOR_nothing)
721 emit_unop_insn (convert_optab_handler (trunc_optab, to_mode, from_mode)->insn_code,
726 /* Handle truncation of volatile memrefs, and so on;
727 the things that couldn't be truncated directly,
728 and for which there was no special instruction.
730 ??? Code above formerly short-circuited this, for most integer
731 mode pairs, with a force_reg in from_mode followed by a recursive
732 call to this routine. Appears always to have been wrong. */
733 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
735 rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
736 emit_move_insn (to, temp);
740 /* Mode combination is not recognized. */
744 /* Return an rtx for a value that would result
745 from converting X to mode MODE.
746 Both X and MODE may be floating, or both integer.
747 UNSIGNEDP is nonzero if X is an unsigned value.
748 This can be done by referring to a part of X in place
749 or by copying to a new temporary with conversion. */
752 convert_to_mode (enum machine_mode mode, rtx x, int unsignedp)
754 return convert_modes (mode, VOIDmode, x, unsignedp);
757 /* Return an rtx for a value that would result
758 from converting X from mode OLDMODE to mode MODE.
759 Both modes may be floating, or both integer.
760 UNSIGNEDP is nonzero if X is an unsigned value.
762 This can be done by referring to a part of X in place
763 or by copying to a new temporary with conversion.
765 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode. */
768 convert_modes (enum machine_mode mode, enum machine_mode oldmode, rtx x, int unsignedp)
772 /* If FROM is a SUBREG that indicates that we have already done at least
773 the required extension, strip it. */
775 if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x)
776 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode)
777 && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp)
778 x = gen_lowpart (mode, x);
780 if (GET_MODE (x) != VOIDmode)
781 oldmode = GET_MODE (x);
786 /* There is one case that we must handle specially: If we are converting
787 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
788 we are to interpret the constant as unsigned, gen_lowpart will do
789 the wrong if the constant appears negative. What we want to do is
790 make the high-order word of the constant zero, not all ones. */
792 if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
793 && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
794 && GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
796 HOST_WIDE_INT val = INTVAL (x);
798 if (oldmode != VOIDmode
799 && HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
801 int width = GET_MODE_BITSIZE (oldmode);
803 /* We need to zero extend VAL. */
804 val &= ((HOST_WIDE_INT) 1 << width) - 1;
807 return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
810 /* We can do this with a gen_lowpart if both desired and current modes
811 are integer, and this is either a constant integer, a register, or a
812 non-volatile MEM. Except for the constant case where MODE is no
813 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
815 if ((GET_CODE (x) == CONST_INT
816 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
817 || (GET_MODE_CLASS (mode) == MODE_INT
818 && GET_MODE_CLASS (oldmode) == MODE_INT
819 && (GET_CODE (x) == CONST_DOUBLE
820 || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
821 && ((MEM_P (x) && ! MEM_VOLATILE_P (x)
822 && direct_load[(int) mode])
824 && (! HARD_REGISTER_P (x)
825 || HARD_REGNO_MODE_OK (REGNO (x), mode))
826 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
827 GET_MODE_BITSIZE (GET_MODE (x)))))))))
829 /* ?? If we don't know OLDMODE, we have to assume here that
830 X does not need sign- or zero-extension. This may not be
831 the case, but it's the best we can do. */
832 if (GET_CODE (x) == CONST_INT && oldmode != VOIDmode
833 && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode))
835 HOST_WIDE_INT val = INTVAL (x);
836 int width = GET_MODE_BITSIZE (oldmode);
838 /* We must sign or zero-extend in this case. Start by
839 zero-extending, then sign extend if we need to. */
840 val &= ((HOST_WIDE_INT) 1 << width) - 1;
842 && (val & ((HOST_WIDE_INT) 1 << (width - 1))))
843 val |= (HOST_WIDE_INT) (-1) << width;
845 return gen_int_mode (val, mode);
848 return gen_lowpart (mode, x);
851 /* Converting from integer constant into mode is always equivalent to an
853 if (VECTOR_MODE_P (mode) && GET_MODE (x) == VOIDmode)
855 gcc_assert (GET_MODE_BITSIZE (mode) == GET_MODE_BITSIZE (oldmode));
856 return simplify_gen_subreg (mode, x, oldmode, 0);
859 temp = gen_reg_rtx (mode);
860 convert_move (temp, x, unsignedp);
864 /* STORE_MAX_PIECES is the number of bytes at a time that we can
865 store efficiently. Due to internal GCC limitations, this is
866 MOVE_MAX_PIECES limited by the number of bytes GCC can represent
867 for an immediate constant. */
869 #define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
871 /* Determine whether the LEN bytes can be moved by using several move
872 instructions. Return nonzero if a call to move_by_pieces should
876 can_move_by_pieces (unsigned HOST_WIDE_INT len,
877 unsigned int align ATTRIBUTE_UNUSED)
879 return MOVE_BY_PIECES_P (len, align);
882 /* Generate several move instructions to copy LEN bytes from block FROM to
883 block TO. (These are MEM rtx's with BLKmode).
885 If PUSH_ROUNDING is defined and TO is NULL, emit_single_push_insn is
886 used to push FROM to the stack.
888 ALIGN is maximum stack alignment we can assume.
890 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
891 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
895 move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
896 unsigned int align, int endp)
898 struct move_by_pieces data;
899 rtx to_addr, from_addr = XEXP (from, 0);
900 unsigned int max_size = MOVE_MAX_PIECES + 1;
901 enum machine_mode mode = VOIDmode, tmode;
902 enum insn_code icode;
904 align = MIN (to ? MEM_ALIGN (to) : align, MEM_ALIGN (from));
907 data.from_addr = from_addr;
910 to_addr = XEXP (to, 0);
913 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
914 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
916 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
923 #ifdef STACK_GROWS_DOWNWARD
929 data.to_addr = to_addr;
932 = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
933 || GET_CODE (from_addr) == POST_INC
934 || GET_CODE (from_addr) == POST_DEC);
936 data.explicit_inc_from = 0;
937 data.explicit_inc_to = 0;
938 if (data.reverse) data.offset = len;
941 /* If copying requires more than two move insns,
942 copy addresses to registers (to make displacements shorter)
943 and use post-increment if available. */
944 if (!(data.autinc_from && data.autinc_to)
945 && move_by_pieces_ninsns (len, align, max_size) > 2)
947 /* Find the mode of the largest move... */
948 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
949 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
950 if (GET_MODE_SIZE (tmode) < max_size)
953 if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
955 data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len));
956 data.autinc_from = 1;
957 data.explicit_inc_from = -1;
959 if (USE_LOAD_POST_INCREMENT (mode) && ! data.autinc_from)
961 data.from_addr = copy_addr_to_reg (from_addr);
962 data.autinc_from = 1;
963 data.explicit_inc_from = 1;
965 if (!data.autinc_from && CONSTANT_P (from_addr))
966 data.from_addr = copy_addr_to_reg (from_addr);
967 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
969 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
971 data.explicit_inc_to = -1;
973 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
975 data.to_addr = copy_addr_to_reg (to_addr);
977 data.explicit_inc_to = 1;
979 if (!data.autinc_to && CONSTANT_P (to_addr))
980 data.to_addr = copy_addr_to_reg (to_addr);
983 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
984 if (align >= GET_MODE_ALIGNMENT (tmode))
985 align = GET_MODE_ALIGNMENT (tmode);
988 enum machine_mode xmode;
990 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
992 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
993 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
994 || SLOW_UNALIGNED_ACCESS (tmode, align))
997 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
1000 /* First move what we can in the largest integer mode, then go to
1001 successively smaller modes. */
1003 while (max_size > 1)
1005 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1006 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1007 if (GET_MODE_SIZE (tmode) < max_size)
1010 if (mode == VOIDmode)
1013 icode = optab_handler (mov_optab, mode)->insn_code;
1014 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1015 move_by_pieces_1 (GEN_FCN (icode), mode, &data);
1017 max_size = GET_MODE_SIZE (mode);
1020 /* The code above should have handled everything. */
1021 gcc_assert (!data.len);
1027 gcc_assert (!data.reverse);
1032 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
1033 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
1035 data.to_addr = copy_addr_to_reg (plus_constant (data.to_addr,
1038 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
1045 to1 = adjust_address (data.to, QImode, data.offset);
1053 /* Return number of insns required to move L bytes by pieces.
1054 ALIGN (in bits) is maximum alignment we can assume. */
1056 static unsigned HOST_WIDE_INT
1057 move_by_pieces_ninsns (unsigned HOST_WIDE_INT l, unsigned int align,
1058 unsigned int max_size)
1060 unsigned HOST_WIDE_INT n_insns = 0;
1061 enum machine_mode tmode;
1063 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
1064 if (align >= GET_MODE_ALIGNMENT (tmode))
1065 align = GET_MODE_ALIGNMENT (tmode);
1068 enum machine_mode tmode, xmode;
1070 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
1072 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
1073 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
1074 || SLOW_UNALIGNED_ACCESS (tmode, align))
1077 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
1080 while (max_size > 1)
1082 enum machine_mode mode = VOIDmode;
1083 enum insn_code icode;
1085 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1086 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1087 if (GET_MODE_SIZE (tmode) < max_size)
1090 if (mode == VOIDmode)
1093 icode = optab_handler (mov_optab, mode)->insn_code;
1094 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1095 n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);
1097 max_size = GET_MODE_SIZE (mode);
1104 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1105 with move instructions for mode MODE. GENFUN is the gen_... function
1106 to make a move insn for that mode. DATA has all the other info. */
1109 move_by_pieces_1 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
1110 struct move_by_pieces *data)
1112 unsigned int size = GET_MODE_SIZE (mode);
1113 rtx to1 = NULL_RTX, from1;
1115 while (data->len >= size)
1118 data->offset -= size;
1122 if (data->autinc_to)
1123 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
1126 to1 = adjust_address (data->to, mode, data->offset);
1129 if (data->autinc_from)
1130 from1 = adjust_automodify_address (data->from, mode, data->from_addr,
1133 from1 = adjust_address (data->from, mode, data->offset);
1135 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
1136 emit_insn (gen_add2_insn (data->to_addr,
1137 GEN_INT (-(HOST_WIDE_INT)size)));
1138 if (HAVE_PRE_DECREMENT && data->explicit_inc_from < 0)
1139 emit_insn (gen_add2_insn (data->from_addr,
1140 GEN_INT (-(HOST_WIDE_INT)size)));
1143 emit_insn ((*genfun) (to1, from1));
1146 #ifdef PUSH_ROUNDING
1147 emit_single_push_insn (mode, from1, NULL);
1153 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
1154 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
1155 if (HAVE_POST_INCREMENT && data->explicit_inc_from > 0)
1156 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
1158 if (! data->reverse)
1159 data->offset += size;
1165 /* Emit code to move a block Y to a block X. This may be done with
1166 string-move instructions, with multiple scalar move instructions,
1167 or with a library call.
1169 Both X and Y must be MEM rtx's (perhaps inside VOLATILE) with mode BLKmode.
1170 SIZE is an rtx that says how long they are.
1171 ALIGN is the maximum alignment we can assume they have.
1172 METHOD describes what kind of copy this is, and what mechanisms may be used.
1174 Return the address of the new block, if memcpy is called and returns it,
1178 emit_block_move_hints (rtx x, rtx y, rtx size, enum block_op_methods method,
1179 unsigned int expected_align, HOST_WIDE_INT expected_size)
1187 case BLOCK_OP_NORMAL:
1188 case BLOCK_OP_TAILCALL:
1189 may_use_call = true;
1192 case BLOCK_OP_CALL_PARM:
1193 may_use_call = block_move_libcall_safe_for_call_parm ();
1195 /* Make inhibit_defer_pop nonzero around the library call
1196 to force it to pop the arguments right away. */
1200 case BLOCK_OP_NO_LIBCALL:
1201 may_use_call = false;
1208 align = MIN (MEM_ALIGN (x), MEM_ALIGN (y));
1210 gcc_assert (MEM_P (x));
1211 gcc_assert (MEM_P (y));
1214 /* Make sure we've got BLKmode addresses; store_one_arg can decide that
1215 block copy is more efficient for other large modes, e.g. DCmode. */
1216 x = adjust_address (x, BLKmode, 0);
1217 y = adjust_address (y, BLKmode, 0);
1219 /* Set MEM_SIZE as appropriate for this block copy. The main place this
1220 can be incorrect is coming from __builtin_memcpy. */
1221 if (GET_CODE (size) == CONST_INT)
1223 if (INTVAL (size) == 0)
1226 x = shallow_copy_rtx (x);
1227 y = shallow_copy_rtx (y);
1228 set_mem_size (x, size);
1229 set_mem_size (y, size);
1232 if (GET_CODE (size) == CONST_INT && MOVE_BY_PIECES_P (INTVAL (size), align))
1233 move_by_pieces (x, y, INTVAL (size), align, 0);
1234 else if (emit_block_move_via_movmem (x, y, size, align,
1235 expected_align, expected_size))
1237 else if (may_use_call)
1238 retval = emit_block_move_via_libcall (x, y, size,
1239 method == BLOCK_OP_TAILCALL);
1241 emit_block_move_via_loop (x, y, size, align);
1243 if (method == BLOCK_OP_CALL_PARM)
1250 emit_block_move (rtx x, rtx y, rtx size, enum block_op_methods method)
1252 return emit_block_move_hints (x, y, size, method, 0, -1);
1255 /* A subroutine of emit_block_move. Returns true if calling the
1256 block move libcall will not clobber any parameters which may have
1257 already been placed on the stack. */
1260 block_move_libcall_safe_for_call_parm (void)
1262 /* If arguments are pushed on the stack, then they're safe. */
1266 /* If registers go on the stack anyway, any argument is sure to clobber
1267 an outgoing argument. */
1268 #if defined (REG_PARM_STACK_SPACE)
1269 if (OUTGOING_REG_PARM_STACK_SPACE)
1272 fn = emit_block_move_libcall_fn (false);
1273 if (REG_PARM_STACK_SPACE (fn) != 0)
1278 /* If any argument goes in memory, then it might clobber an outgoing
1281 CUMULATIVE_ARGS args_so_far;
1284 fn = emit_block_move_libcall_fn (false);
1285 INIT_CUMULATIVE_ARGS (args_so_far, TREE_TYPE (fn), NULL_RTX, 0, 3);
1287 arg = TYPE_ARG_TYPES (TREE_TYPE (fn));
1288 for ( ; arg != void_list_node ; arg = TREE_CHAIN (arg))
1290 enum machine_mode mode = TYPE_MODE (TREE_VALUE (arg));
1291 rtx tmp = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
1292 if (!tmp || !REG_P (tmp))
1294 if (targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL, 1))
1296 FUNCTION_ARG_ADVANCE (args_so_far, mode, NULL_TREE, 1);
1302 /* A subroutine of emit_block_move. Expand a movmem pattern;
1303 return true if successful. */
1306 emit_block_move_via_movmem (rtx x, rtx y, rtx size, unsigned int align,
1307 unsigned int expected_align, HOST_WIDE_INT expected_size)
1309 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
1310 int save_volatile_ok = volatile_ok;
1311 enum machine_mode mode;
1313 if (expected_align < align)
1314 expected_align = align;
1316 /* Since this is a move insn, we don't care about volatility. */
1319 /* Try the most limited insn first, because there's no point
1320 including more than one in the machine description unless
1321 the more limited one has some advantage. */
1323 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
1324 mode = GET_MODE_WIDER_MODE (mode))
1326 enum insn_code code = movmem_optab[(int) mode];
1327 insn_operand_predicate_fn pred;
1329 if (code != CODE_FOR_nothing
1330 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1331 here because if SIZE is less than the mode mask, as it is
1332 returned by the macro, it will definitely be less than the
1333 actual mode mask. */
1334 && ((GET_CODE (size) == CONST_INT
1335 && ((unsigned HOST_WIDE_INT) INTVAL (size)
1336 <= (GET_MODE_MASK (mode) >> 1)))
1337 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
1338 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
1339 || (*pred) (x, BLKmode))
1340 && ((pred = insn_data[(int) code].operand[1].predicate) == 0
1341 || (*pred) (y, BLKmode))
1342 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
1343 || (*pred) (opalign, VOIDmode)))
1346 rtx last = get_last_insn ();
1349 op2 = convert_to_mode (mode, size, 1);
1350 pred = insn_data[(int) code].operand[2].predicate;
1351 if (pred != 0 && ! (*pred) (op2, mode))
1352 op2 = copy_to_mode_reg (mode, op2);
1354 /* ??? When called via emit_block_move_for_call, it'd be
1355 nice if there were some way to inform the backend, so
1356 that it doesn't fail the expansion because it thinks
1357 emitting the libcall would be more efficient. */
1359 if (insn_data[(int) code].n_operands == 4)
1360 pat = GEN_FCN ((int) code) (x, y, op2, opalign);
1362 pat = GEN_FCN ((int) code) (x, y, op2, opalign,
1363 GEN_INT (expected_align),
1364 GEN_INT (expected_size));
1368 volatile_ok = save_volatile_ok;
1372 delete_insns_since (last);
1376 volatile_ok = save_volatile_ok;
1380 /* A subroutine of emit_block_move. Expand a call to memcpy.
1381 Return the return value from memcpy, 0 otherwise. */
1384 emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall)
1386 rtx dst_addr, src_addr;
1387 tree call_expr, fn, src_tree, dst_tree, size_tree;
1388 enum machine_mode size_mode;
1391 /* Emit code to copy the addresses of DST and SRC and SIZE into new
1392 pseudos. We can then place those new pseudos into a VAR_DECL and
1395 dst_addr = copy_to_mode_reg (Pmode, XEXP (dst, 0));
1396 src_addr = copy_to_mode_reg (Pmode, XEXP (src, 0));
1398 dst_addr = convert_memory_address (ptr_mode, dst_addr);
1399 src_addr = convert_memory_address (ptr_mode, src_addr);
1401 dst_tree = make_tree (ptr_type_node, dst_addr);
1402 src_tree = make_tree (ptr_type_node, src_addr);
1404 size_mode = TYPE_MODE (sizetype);
1406 size = convert_to_mode (size_mode, size, 1);
1407 size = copy_to_mode_reg (size_mode, size);
1409 /* It is incorrect to use the libcall calling conventions to call
1410 memcpy in this context. This could be a user call to memcpy and
1411 the user may wish to examine the return value from memcpy. For
1412 targets where libcalls and normal calls have different conventions
1413 for returning pointers, we could end up generating incorrect code. */
1415 size_tree = make_tree (sizetype, size);
1417 fn = emit_block_move_libcall_fn (true);
1418 call_expr = build_call_expr (fn, 3, dst_tree, src_tree, size_tree);
1419 CALL_EXPR_TAILCALL (call_expr) = tailcall;
1421 retval = expand_normal (call_expr);
1426 /* A subroutine of emit_block_move_via_libcall. Create the tree node
1427 for the function we use for block copies. The first time FOR_CALL
1428 is true, we call assemble_external. */
1430 static GTY(()) tree block_move_fn;
1433 init_block_move_fn (const char *asmspec)
1439 fn = get_identifier ("memcpy");
1440 args = build_function_type_list (ptr_type_node, ptr_type_node,
1441 const_ptr_type_node, sizetype,
1444 fn = build_decl (FUNCTION_DECL, fn, args);
1445 DECL_EXTERNAL (fn) = 1;
1446 TREE_PUBLIC (fn) = 1;
1447 DECL_ARTIFICIAL (fn) = 1;
1448 TREE_NOTHROW (fn) = 1;
1449 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
1450 DECL_VISIBILITY_SPECIFIED (fn) = 1;
1456 set_user_assembler_name (block_move_fn, asmspec);
1460 emit_block_move_libcall_fn (int for_call)
1462 static bool emitted_extern;
1465 init_block_move_fn (NULL);
1467 if (for_call && !emitted_extern)
1469 emitted_extern = true;
1470 make_decl_rtl (block_move_fn);
1471 assemble_external (block_move_fn);
1474 return block_move_fn;
1477 /* A subroutine of emit_block_move. Copy the data via an explicit
1478 loop. This is used only when libcalls are forbidden. */
1479 /* ??? It'd be nice to copy in hunks larger than QImode. */
1482 emit_block_move_via_loop (rtx x, rtx y, rtx size,
1483 unsigned int align ATTRIBUTE_UNUSED)
1485 rtx cmp_label, top_label, iter, x_addr, y_addr, tmp;
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 (Pmode, iter_mode, iter, true);
1506 x_addr = gen_rtx_PLUS (Pmode, x_addr, tmp);
1507 y_addr = gen_rtx_PLUS (Pmode, y_addr, tmp);
1508 x = change_address (x, QImode, x_addr);
1509 y = change_address (y, QImode, y_addr);
1511 emit_move_insn (x, y);
1513 tmp = expand_simple_binop (iter_mode, PLUS, iter, const1_rtx, iter,
1514 true, OPTAB_LIB_WIDEN);
1516 emit_move_insn (iter, tmp);
1518 emit_label (cmp_label);
1520 emit_cmp_and_jump_insns (iter, size, LT, NULL_RTX, iter_mode,
1524 /* Copy all or part of a value X into registers starting at REGNO.
1525 The number of registers to be filled is NREGS. */
1528 move_block_to_reg (int regno, rtx x, int nregs, enum machine_mode mode)
1531 #ifdef HAVE_load_multiple
1539 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
1540 x = validize_mem (force_const_mem (mode, x));
1542 /* See if the machine can do this with a load multiple insn. */
1543 #ifdef HAVE_load_multiple
1544 if (HAVE_load_multiple)
1546 last = get_last_insn ();
1547 pat = gen_load_multiple (gen_rtx_REG (word_mode, regno), x,
1555 delete_insns_since (last);
1559 for (i = 0; i < nregs; i++)
1560 emit_move_insn (gen_rtx_REG (word_mode, regno + i),
1561 operand_subword_force (x, i, mode));
1564 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1565 The number of registers to be filled is NREGS. */
1568 move_block_from_reg (int regno, rtx x, int nregs)
1575 /* See if the machine can do this with a store multiple insn. */
1576 #ifdef HAVE_store_multiple
1577 if (HAVE_store_multiple)
1579 rtx last = get_last_insn ();
1580 rtx pat = gen_store_multiple (x, gen_rtx_REG (word_mode, regno),
1588 delete_insns_since (last);
1592 for (i = 0; i < nregs; i++)
1594 rtx tem = operand_subword (x, i, 1, BLKmode);
1598 emit_move_insn (tem, gen_rtx_REG (word_mode, regno + i));
1602 /* Generate a PARALLEL rtx for a new non-consecutive group of registers from
1603 ORIG, where ORIG is a non-consecutive group of registers represented by
1604 a PARALLEL. The clone is identical to the original except in that the
1605 original set of registers is replaced by a new set of pseudo registers.
1606 The new set has the same modes as the original set. */
1609 gen_group_rtx (rtx orig)
1614 gcc_assert (GET_CODE (orig) == PARALLEL);
1616 length = XVECLEN (orig, 0);
1617 tmps = alloca (sizeof (rtx) * length);
1619 /* Skip a NULL entry in first slot. */
1620 i = XEXP (XVECEXP (orig, 0, 0), 0) ? 0 : 1;
1625 for (; i < length; i++)
1627 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (orig, 0, i), 0));
1628 rtx offset = XEXP (XVECEXP (orig, 0, i), 1);
1630 tmps[i] = gen_rtx_EXPR_LIST (VOIDmode, gen_reg_rtx (mode), offset);
1633 return gen_rtx_PARALLEL (GET_MODE (orig), gen_rtvec_v (length, tmps));
1636 /* A subroutine of emit_group_load. Arguments as for emit_group_load,
1637 except that values are placed in TMPS[i], and must later be moved
1638 into corresponding XEXP (XVECEXP (DST, 0, i), 0) element. */
1641 emit_group_load_1 (rtx *tmps, rtx dst, rtx orig_src, tree type, int ssize)
1645 enum machine_mode m = GET_MODE (orig_src);
1647 gcc_assert (GET_CODE (dst) == PARALLEL);
1650 && !SCALAR_INT_MODE_P (m)
1651 && !MEM_P (orig_src)
1652 && GET_CODE (orig_src) != CONCAT)
1654 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_src));
1655 if (imode == BLKmode)
1656 src = assign_stack_temp (GET_MODE (orig_src), ssize, 0);
1658 src = gen_reg_rtx (imode);
1659 if (imode != BLKmode)
1660 src = gen_lowpart (GET_MODE (orig_src), src);
1661 emit_move_insn (src, orig_src);
1662 /* ...and back again. */
1663 if (imode != BLKmode)
1664 src = gen_lowpart (imode, src);
1665 emit_group_load_1 (tmps, dst, src, type, ssize);
1669 /* Check for a NULL entry, used to indicate that the parameter goes
1670 both on the stack and in registers. */
1671 if (XEXP (XVECEXP (dst, 0, 0), 0))
1676 /* Process the pieces. */
1677 for (i = start; i < XVECLEN (dst, 0); i++)
1679 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (dst, 0, i), 0));
1680 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (dst, 0, i), 1));
1681 unsigned int bytelen = GET_MODE_SIZE (mode);
1684 /* Handle trailing fragments that run over the size of the struct. */
1685 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
1687 /* Arrange to shift the fragment to where it belongs.
1688 extract_bit_field loads to the lsb of the reg. */
1690 #ifdef BLOCK_REG_PADDING
1691 BLOCK_REG_PADDING (GET_MODE (orig_src), type, i == start)
1692 == (BYTES_BIG_ENDIAN ? upward : downward)
1697 shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
1698 bytelen = ssize - bytepos;
1699 gcc_assert (bytelen > 0);
1702 /* If we won't be loading directly from memory, protect the real source
1703 from strange tricks we might play; but make sure that the source can
1704 be loaded directly into the destination. */
1706 if (!MEM_P (orig_src)
1707 && (!CONSTANT_P (orig_src)
1708 || (GET_MODE (orig_src) != mode
1709 && GET_MODE (orig_src) != VOIDmode)))
1711 if (GET_MODE (orig_src) == VOIDmode)
1712 src = gen_reg_rtx (mode);
1714 src = gen_reg_rtx (GET_MODE (orig_src));
1716 emit_move_insn (src, orig_src);
1719 /* Optimize the access just a bit. */
1721 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (src))
1722 || MEM_ALIGN (src) >= GET_MODE_ALIGNMENT (mode))
1723 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
1724 && bytelen == GET_MODE_SIZE (mode))
1726 tmps[i] = gen_reg_rtx (mode);
1727 emit_move_insn (tmps[i], adjust_address (src, mode, bytepos));
1729 else if (COMPLEX_MODE_P (mode)
1730 && GET_MODE (src) == mode
1731 && bytelen == GET_MODE_SIZE (mode))
1732 /* Let emit_move_complex do the bulk of the work. */
1734 else if (GET_CODE (src) == CONCAT)
1736 unsigned int slen = GET_MODE_SIZE (GET_MODE (src));
1737 unsigned int slen0 = GET_MODE_SIZE (GET_MODE (XEXP (src, 0)));
1739 if ((bytepos == 0 && bytelen == slen0)
1740 || (bytepos != 0 && bytepos + bytelen <= slen))
1742 /* The following assumes that the concatenated objects all
1743 have the same size. In this case, a simple calculation
1744 can be used to determine the object and the bit field
1746 tmps[i] = XEXP (src, bytepos / slen0);
1747 if (! CONSTANT_P (tmps[i])
1748 && (!REG_P (tmps[i]) || GET_MODE (tmps[i]) != mode))
1749 tmps[i] = extract_bit_field (tmps[i], bytelen * BITS_PER_UNIT,
1750 (bytepos % slen0) * BITS_PER_UNIT,
1751 1, NULL_RTX, mode, mode);
1757 gcc_assert (!bytepos);
1758 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1759 emit_move_insn (mem, src);
1760 tmps[i] = extract_bit_field (mem, bytelen * BITS_PER_UNIT,
1761 0, 1, NULL_RTX, mode, mode);
1764 /* FIXME: A SIMD parallel will eventually lead to a subreg of a
1765 SIMD register, which is currently broken. While we get GCC
1766 to emit proper RTL for these cases, let's dump to memory. */
1767 else if (VECTOR_MODE_P (GET_MODE (dst))
1770 int slen = GET_MODE_SIZE (GET_MODE (src));
1773 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1774 emit_move_insn (mem, src);
1775 tmps[i] = adjust_address (mem, mode, (int) bytepos);
1777 else if (CONSTANT_P (src) && GET_MODE (dst) != BLKmode
1778 && XVECLEN (dst, 0) > 1)
1779 tmps[i] = simplify_gen_subreg (mode, src, GET_MODE(dst), bytepos);
1780 else if (CONSTANT_P (src))
1782 HOST_WIDE_INT len = (HOST_WIDE_INT) bytelen;
1790 gcc_assert (2 * len == ssize);
1791 split_double (src, &first, &second);
1798 else if (REG_P (src) && GET_MODE (src) == mode)
1801 tmps[i] = extract_bit_field (src, bytelen * BITS_PER_UNIT,
1802 bytepos * BITS_PER_UNIT, 1, NULL_RTX,
1806 tmps[i] = expand_shift (LSHIFT_EXPR, mode, tmps[i],
1807 build_int_cst (NULL_TREE, shift), tmps[i], 0);
1811 /* Emit code to move a block SRC of type TYPE to a block DST,
1812 where DST is non-consecutive registers represented by a PARALLEL.
1813 SSIZE represents the total size of block ORIG_SRC in bytes, or -1
1817 emit_group_load (rtx dst, rtx src, tree type, int ssize)
1822 tmps = alloca (sizeof (rtx) * XVECLEN (dst, 0));
1823 emit_group_load_1 (tmps, dst, src, type, ssize);
1825 /* Copy the extracted pieces into the proper (probable) hard regs. */
1826 for (i = 0; i < XVECLEN (dst, 0); i++)
1828 rtx d = XEXP (XVECEXP (dst, 0, i), 0);
1831 emit_move_insn (d, tmps[i]);
1835 /* Similar, but load SRC into new pseudos in a format that looks like
1836 PARALLEL. This can later be fed to emit_group_move to get things
1837 in the right place. */
1840 emit_group_load_into_temps (rtx parallel, rtx src, tree type, int ssize)
1845 vec = rtvec_alloc (XVECLEN (parallel, 0));
1846 emit_group_load_1 (&RTVEC_ELT (vec, 0), parallel, src, type, ssize);
1848 /* Convert the vector to look just like the original PARALLEL, except
1849 with the computed values. */
1850 for (i = 0; i < XVECLEN (parallel, 0); i++)
1852 rtx e = XVECEXP (parallel, 0, i);
1853 rtx d = XEXP (e, 0);
1857 d = force_reg (GET_MODE (d), RTVEC_ELT (vec, i));
1858 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), d, XEXP (e, 1));
1860 RTVEC_ELT (vec, i) = e;
1863 return gen_rtx_PARALLEL (GET_MODE (parallel), vec);
1866 /* Emit code to move a block SRC to block DST, where SRC and DST are
1867 non-consecutive groups of registers, each represented by a PARALLEL. */
1870 emit_group_move (rtx dst, rtx src)
1874 gcc_assert (GET_CODE (src) == PARALLEL
1875 && GET_CODE (dst) == PARALLEL
1876 && XVECLEN (src, 0) == XVECLEN (dst, 0));
1878 /* Skip first entry if NULL. */
1879 for (i = XEXP (XVECEXP (src, 0, 0), 0) ? 0 : 1; i < XVECLEN (src, 0); i++)
1880 emit_move_insn (XEXP (XVECEXP (dst, 0, i), 0),
1881 XEXP (XVECEXP (src, 0, i), 0));
1884 /* Move a group of registers represented by a PARALLEL into pseudos. */
1887 emit_group_move_into_temps (rtx src)
1889 rtvec vec = rtvec_alloc (XVECLEN (src, 0));
1892 for (i = 0; i < XVECLEN (src, 0); i++)
1894 rtx e = XVECEXP (src, 0, i);
1895 rtx d = XEXP (e, 0);
1898 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), copy_to_reg (d), XEXP (e, 1));
1899 RTVEC_ELT (vec, i) = e;
1902 return gen_rtx_PARALLEL (GET_MODE (src), vec);
1905 /* Emit code to move a block SRC to a block ORIG_DST of type TYPE,
1906 where SRC is non-consecutive registers represented by a PARALLEL.
1907 SSIZE represents the total size of block ORIG_DST, or -1 if not
1911 emit_group_store (rtx orig_dst, rtx src, tree type ATTRIBUTE_UNUSED, int ssize)
1914 int start, finish, i;
1915 enum machine_mode m = GET_MODE (orig_dst);
1917 gcc_assert (GET_CODE (src) == PARALLEL);
1919 if (!SCALAR_INT_MODE_P (m)
1920 && !MEM_P (orig_dst) && GET_CODE (orig_dst) != CONCAT)
1922 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_dst));
1923 if (imode == BLKmode)
1924 dst = assign_stack_temp (GET_MODE (orig_dst), ssize, 0);
1926 dst = gen_reg_rtx (imode);
1927 emit_group_store (dst, src, type, ssize);
1928 if (imode != BLKmode)
1929 dst = gen_lowpart (GET_MODE (orig_dst), dst);
1930 emit_move_insn (orig_dst, dst);
1934 /* Check for a NULL entry, used to indicate that the parameter goes
1935 both on the stack and in registers. */
1936 if (XEXP (XVECEXP (src, 0, 0), 0))
1940 finish = XVECLEN (src, 0);
1942 tmps = alloca (sizeof (rtx) * finish);
1944 /* Copy the (probable) hard regs into pseudos. */
1945 for (i = start; i < finish; i++)
1947 rtx reg = XEXP (XVECEXP (src, 0, i), 0);
1948 if (!REG_P (reg) || REGNO (reg) < FIRST_PSEUDO_REGISTER)
1950 tmps[i] = gen_reg_rtx (GET_MODE (reg));
1951 emit_move_insn (tmps[i], reg);
1957 /* If we won't be storing directly into memory, protect the real destination
1958 from strange tricks we might play. */
1960 if (GET_CODE (dst) == PARALLEL)
1964 /* We can get a PARALLEL dst if there is a conditional expression in
1965 a return statement. In that case, the dst and src are the same,
1966 so no action is necessary. */
1967 if (rtx_equal_p (dst, src))
1970 /* It is unclear if we can ever reach here, but we may as well handle
1971 it. Allocate a temporary, and split this into a store/load to/from
1974 temp = assign_stack_temp (GET_MODE (dst), ssize, 0);
1975 emit_group_store (temp, src, type, ssize);
1976 emit_group_load (dst, temp, type, ssize);
1979 else if (!MEM_P (dst) && GET_CODE (dst) != CONCAT)
1981 enum machine_mode outer = GET_MODE (dst);
1982 enum machine_mode inner;
1983 HOST_WIDE_INT bytepos;
1987 if (!REG_P (dst) || REGNO (dst) < FIRST_PSEUDO_REGISTER)
1988 dst = gen_reg_rtx (outer);
1990 /* Make life a bit easier for combine. */
1991 /* If the first element of the vector is the low part
1992 of the destination mode, use a paradoxical subreg to
1993 initialize the destination. */
1996 inner = GET_MODE (tmps[start]);
1997 bytepos = subreg_lowpart_offset (inner, outer);
1998 if (INTVAL (XEXP (XVECEXP (src, 0, start), 1)) == bytepos)
2000 temp = simplify_gen_subreg (outer, tmps[start],
2004 emit_move_insn (dst, temp);
2011 /* If the first element wasn't the low part, try the last. */
2013 && start < finish - 1)
2015 inner = GET_MODE (tmps[finish - 1]);
2016 bytepos = subreg_lowpart_offset (inner, outer);
2017 if (INTVAL (XEXP (XVECEXP (src, 0, finish - 1), 1)) == bytepos)
2019 temp = simplify_gen_subreg (outer, tmps[finish - 1],
2023 emit_move_insn (dst, temp);
2030 /* Otherwise, simply initialize the result to zero. */
2032 emit_move_insn (dst, CONST0_RTX (outer));
2035 /* Process the pieces. */
2036 for (i = start; i < finish; i++)
2038 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (src, 0, i), 1));
2039 enum machine_mode mode = GET_MODE (tmps[i]);
2040 unsigned int bytelen = GET_MODE_SIZE (mode);
2043 /* Handle trailing fragments that run over the size of the struct. */
2044 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
2046 /* store_bit_field always takes its value from the lsb.
2047 Move the fragment to the lsb if it's not already there. */
2049 #ifdef BLOCK_REG_PADDING
2050 BLOCK_REG_PADDING (GET_MODE (orig_dst), type, i == start)
2051 == (BYTES_BIG_ENDIAN ? upward : downward)
2057 int shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
2058 tmps[i] = expand_shift (RSHIFT_EXPR, mode, tmps[i],
2059 build_int_cst (NULL_TREE, shift),
2062 bytelen = ssize - bytepos;
2065 if (GET_CODE (dst) == CONCAT)
2067 if (bytepos + bytelen <= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2068 dest = XEXP (dst, 0);
2069 else if (bytepos >= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2071 bytepos -= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0)));
2072 dest = XEXP (dst, 1);
2076 gcc_assert (bytepos == 0 && XVECLEN (src, 0));
2077 dest = assign_stack_temp (GET_MODE (dest),
2078 GET_MODE_SIZE (GET_MODE (dest)), 0);
2079 emit_move_insn (adjust_address (dest, GET_MODE (tmps[i]), bytepos),
2086 /* Optimize the access just a bit. */
2088 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (dest))
2089 || MEM_ALIGN (dest) >= GET_MODE_ALIGNMENT (mode))
2090 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
2091 && bytelen == GET_MODE_SIZE (mode))
2092 emit_move_insn (adjust_address (dest, mode, bytepos), tmps[i]);
2094 store_bit_field (dest, bytelen * BITS_PER_UNIT, bytepos * BITS_PER_UNIT,
2098 /* Copy from the pseudo into the (probable) hard reg. */
2099 if (orig_dst != dst)
2100 emit_move_insn (orig_dst, dst);
2103 /* Generate code to copy a BLKmode object of TYPE out of a
2104 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2105 is null, a stack temporary is created. TGTBLK is returned.
2107 The purpose of this routine is to handle functions that return
2108 BLKmode structures in registers. Some machines (the PA for example)
2109 want to return all small structures in registers regardless of the
2110 structure's alignment. */
2113 copy_blkmode_from_reg (rtx tgtblk, rtx srcreg, tree type)
2115 unsigned HOST_WIDE_INT bytes = int_size_in_bytes (type);
2116 rtx src = NULL, dst = NULL;
2117 unsigned HOST_WIDE_INT bitsize = MIN (TYPE_ALIGN (type), BITS_PER_WORD);
2118 unsigned HOST_WIDE_INT bitpos, xbitpos, padding_correction = 0;
2119 enum machine_mode copy_mode;
2123 tgtblk = assign_temp (build_qualified_type (type,
2125 | TYPE_QUAL_CONST)),
2127 preserve_temp_slots (tgtblk);
2130 /* This code assumes srcreg is at least a full word. If it isn't, copy it
2131 into a new pseudo which is a full word. */
2133 if (GET_MODE (srcreg) != BLKmode
2134 && GET_MODE_SIZE (GET_MODE (srcreg)) < UNITS_PER_WORD)
2135 srcreg = convert_to_mode (word_mode, srcreg, TYPE_UNSIGNED (type));
2137 /* If the structure doesn't take up a whole number of words, see whether
2138 SRCREG is padded on the left or on the right. If it's on the left,
2139 set PADDING_CORRECTION to the number of bits to skip.
2141 In most ABIs, the structure will be returned at the least end of
2142 the register, which translates to right padding on little-endian
2143 targets and left padding on big-endian targets. The opposite
2144 holds if the structure is returned at the most significant
2145 end of the register. */
2146 if (bytes % UNITS_PER_WORD != 0
2147 && (targetm.calls.return_in_msb (type)
2149 : BYTES_BIG_ENDIAN))
2151 = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) * BITS_PER_UNIT));
2153 /* Copy the structure BITSIZE bits at a time. If the target lives in
2154 memory, take care of not reading/writing past its end by selecting
2155 a copy mode suited to BITSIZE. This should always be possible given
2158 We could probably emit more efficient code for machines which do not use
2159 strict alignment, but it doesn't seem worth the effort at the current
2162 copy_mode = word_mode;
2165 enum machine_mode mem_mode = mode_for_size (bitsize, MODE_INT, 1);
2166 if (mem_mode != BLKmode)
2167 copy_mode = mem_mode;
2170 for (bitpos = 0, xbitpos = padding_correction;
2171 bitpos < bytes * BITS_PER_UNIT;
2172 bitpos += bitsize, xbitpos += bitsize)
2174 /* We need a new source operand each time xbitpos is on a
2175 word boundary and when xbitpos == padding_correction
2176 (the first time through). */
2177 if (xbitpos % BITS_PER_WORD == 0
2178 || xbitpos == padding_correction)
2179 src = operand_subword_force (srcreg, xbitpos / BITS_PER_WORD,
2182 /* We need a new destination operand each time bitpos is on
2184 if (bitpos % BITS_PER_WORD == 0)
2185 dst = operand_subword (tgtblk, bitpos / BITS_PER_WORD, 1, BLKmode);
2187 /* Use xbitpos for the source extraction (right justified) and
2188 bitpos for the destination store (left justified). */
2189 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, copy_mode,
2190 extract_bit_field (src, bitsize,
2191 xbitpos % BITS_PER_WORD, 1,
2192 NULL_RTX, copy_mode, copy_mode));
2198 /* Add a USE expression for REG to the (possibly empty) list pointed
2199 to by CALL_FUSAGE. REG must denote a hard register. */
2202 use_reg (rtx *call_fusage, rtx reg)
2204 gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
2207 = gen_rtx_EXPR_LIST (VOIDmode,
2208 gen_rtx_USE (VOIDmode, reg), *call_fusage);
2211 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2212 starting at REGNO. All of these registers must be hard registers. */
2215 use_regs (rtx *call_fusage, int regno, int nregs)
2219 gcc_assert (regno + nregs <= FIRST_PSEUDO_REGISTER);
2221 for (i = 0; i < nregs; i++)
2222 use_reg (call_fusage, regno_reg_rtx[regno + i]);
2225 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2226 PARALLEL REGS. This is for calls that pass values in multiple
2227 non-contiguous locations. The Irix 6 ABI has examples of this. */
2230 use_group_regs (rtx *call_fusage, rtx regs)
2234 for (i = 0; i < XVECLEN (regs, 0); i++)
2236 rtx reg = XEXP (XVECEXP (regs, 0, i), 0);
2238 /* A NULL entry means the parameter goes both on the stack and in
2239 registers. This can also be a MEM for targets that pass values
2240 partially on the stack and partially in registers. */
2241 if (reg != 0 && REG_P (reg))
2242 use_reg (call_fusage, reg);
2247 /* Determine whether the LEN bytes generated by CONSTFUN can be
2248 stored to memory using several move instructions. CONSTFUNDATA is
2249 a pointer which will be passed as argument in every CONSTFUN call.
2250 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2251 a memset operation and false if it's a copy of a constant string.
2252 Return nonzero if a call to store_by_pieces should succeed. */
2255 can_store_by_pieces (unsigned HOST_WIDE_INT len,
2256 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2257 void *constfundata, unsigned int align, bool memsetp)
2259 unsigned HOST_WIDE_INT l;
2260 unsigned int max_size;
2261 HOST_WIDE_INT offset = 0;
2262 enum machine_mode mode, tmode;
2263 enum insn_code icode;
2271 ? SET_BY_PIECES_P (len, align)
2272 : STORE_BY_PIECES_P (len, align)))
2275 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2276 if (align >= GET_MODE_ALIGNMENT (tmode))
2277 align = GET_MODE_ALIGNMENT (tmode);
2280 enum machine_mode xmode;
2282 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2284 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2285 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2286 || SLOW_UNALIGNED_ACCESS (tmode, align))
2289 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2292 /* We would first store what we can in the largest integer mode, then go to
2293 successively smaller modes. */
2296 reverse <= (HAVE_PRE_DECREMENT || HAVE_POST_DECREMENT);
2301 max_size = STORE_MAX_PIECES + 1;
2302 while (max_size > 1)
2304 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2305 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2306 if (GET_MODE_SIZE (tmode) < max_size)
2309 if (mode == VOIDmode)
2312 icode = optab_handler (mov_optab, mode)->insn_code;
2313 if (icode != CODE_FOR_nothing
2314 && align >= GET_MODE_ALIGNMENT (mode))
2316 unsigned int size = GET_MODE_SIZE (mode);
2323 cst = (*constfun) (constfundata, offset, mode);
2324 if (!LEGITIMATE_CONSTANT_P (cst))
2334 max_size = GET_MODE_SIZE (mode);
2337 /* The code above should have handled everything. */
2344 /* Generate several move instructions to store LEN bytes generated by
2345 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
2346 pointer which will be passed as argument in every CONSTFUN call.
2347 ALIGN is maximum alignment we can assume. MEMSETP is true if this is
2348 a memset operation and false if it's a copy of a constant string.
2349 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
2350 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
2354 store_by_pieces (rtx to, unsigned HOST_WIDE_INT len,
2355 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2356 void *constfundata, unsigned int align, bool memsetp, int endp)
2358 struct store_by_pieces data;
2362 gcc_assert (endp != 2);
2367 ? SET_BY_PIECES_P (len, align)
2368 : STORE_BY_PIECES_P (len, align));
2369 data.constfun = constfun;
2370 data.constfundata = constfundata;
2373 store_by_pieces_1 (&data, align);
2378 gcc_assert (!data.reverse);
2383 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
2384 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
2386 data.to_addr = copy_addr_to_reg (plus_constant (data.to_addr,
2389 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
2396 to1 = adjust_address (data.to, QImode, data.offset);
2404 /* Generate several move instructions to clear LEN bytes of block TO. (A MEM
2405 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2408 clear_by_pieces (rtx to, unsigned HOST_WIDE_INT len, unsigned int align)
2410 struct store_by_pieces data;
2415 data.constfun = clear_by_pieces_1;
2416 data.constfundata = NULL;
2419 store_by_pieces_1 (&data, align);
2422 /* Callback routine for clear_by_pieces.
2423 Return const0_rtx unconditionally. */
2426 clear_by_pieces_1 (void *data ATTRIBUTE_UNUSED,
2427 HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
2428 enum machine_mode mode ATTRIBUTE_UNUSED)
2433 /* Subroutine of clear_by_pieces and store_by_pieces.
2434 Generate several move instructions to store LEN bytes of block TO. (A MEM
2435 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2438 store_by_pieces_1 (struct store_by_pieces *data ATTRIBUTE_UNUSED,
2439 unsigned int align ATTRIBUTE_UNUSED)
2441 rtx to_addr = XEXP (data->to, 0);
2442 unsigned int max_size = STORE_MAX_PIECES + 1;
2443 enum machine_mode mode = VOIDmode, tmode;
2444 enum insn_code icode;
2447 data->to_addr = to_addr;
2449 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
2450 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
2452 data->explicit_inc_to = 0;
2454 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
2456 data->offset = data->len;
2458 /* If storing requires more than two move insns,
2459 copy addresses to registers (to make displacements shorter)
2460 and use post-increment if available. */
2461 if (!data->autinc_to
2462 && move_by_pieces_ninsns (data->len, align, max_size) > 2)
2464 /* Determine the main mode we'll be using. */
2465 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2466 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2467 if (GET_MODE_SIZE (tmode) < max_size)
2470 if (USE_STORE_PRE_DECREMENT (mode) && data->reverse && ! data->autinc_to)
2472 data->to_addr = copy_addr_to_reg (plus_constant (to_addr, data->len));
2473 data->autinc_to = 1;
2474 data->explicit_inc_to = -1;
2477 if (USE_STORE_POST_INCREMENT (mode) && ! data->reverse
2478 && ! data->autinc_to)
2480 data->to_addr = copy_addr_to_reg (to_addr);
2481 data->autinc_to = 1;
2482 data->explicit_inc_to = 1;
2485 if ( !data->autinc_to && CONSTANT_P (to_addr))
2486 data->to_addr = copy_addr_to_reg (to_addr);
2489 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2490 if (align >= GET_MODE_ALIGNMENT (tmode))
2491 align = GET_MODE_ALIGNMENT (tmode);
2494 enum machine_mode xmode;
2496 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2498 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2499 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2500 || SLOW_UNALIGNED_ACCESS (tmode, align))
2503 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2506 /* First store what we can in the largest integer mode, then go to
2507 successively smaller modes. */
2509 while (max_size > 1)
2511 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2512 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2513 if (GET_MODE_SIZE (tmode) < max_size)
2516 if (mode == VOIDmode)
2519 icode = optab_handler (mov_optab, mode)->insn_code;
2520 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
2521 store_by_pieces_2 (GEN_FCN (icode), mode, data);
2523 max_size = GET_MODE_SIZE (mode);
2526 /* The code above should have handled everything. */
2527 gcc_assert (!data->len);
2530 /* Subroutine of store_by_pieces_1. Store as many bytes as appropriate
2531 with move instructions for mode MODE. GENFUN is the gen_... function
2532 to make a move insn for that mode. DATA has all the other info. */
2535 store_by_pieces_2 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
2536 struct store_by_pieces *data)
2538 unsigned int size = GET_MODE_SIZE (mode);
2541 while (data->len >= size)
2544 data->offset -= size;
2546 if (data->autinc_to)
2547 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
2550 to1 = adjust_address (data->to, mode, data->offset);
2552 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
2553 emit_insn (gen_add2_insn (data->to_addr,
2554 GEN_INT (-(HOST_WIDE_INT) size)));
2556 cst = (*data->constfun) (data->constfundata, data->offset, mode);
2557 emit_insn ((*genfun) (to1, cst));
2559 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
2560 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
2562 if (! data->reverse)
2563 data->offset += size;
2569 /* Write zeros through the storage of OBJECT. If OBJECT has BLKmode, SIZE is
2570 its length in bytes. */
2573 clear_storage_hints (rtx object, rtx size, enum block_op_methods method,
2574 unsigned int expected_align, HOST_WIDE_INT expected_size)
2576 enum machine_mode mode = GET_MODE (object);
2579 gcc_assert (method == BLOCK_OP_NORMAL || method == BLOCK_OP_TAILCALL);
2581 /* If OBJECT is not BLKmode and SIZE is the same size as its mode,
2582 just move a zero. Otherwise, do this a piece at a time. */
2584 && GET_CODE (size) == CONST_INT
2585 && INTVAL (size) == (HOST_WIDE_INT) GET_MODE_SIZE (mode))
2587 rtx zero = CONST0_RTX (mode);
2590 emit_move_insn (object, zero);
2594 if (COMPLEX_MODE_P (mode))
2596 zero = CONST0_RTX (GET_MODE_INNER (mode));
2599 write_complex_part (object, zero, 0);
2600 write_complex_part (object, zero, 1);
2606 if (size == const0_rtx)
2609 align = MEM_ALIGN (object);
2611 if (GET_CODE (size) == CONST_INT
2612 && CLEAR_BY_PIECES_P (INTVAL (size), align))
2613 clear_by_pieces (object, INTVAL (size), align);
2614 else if (set_storage_via_setmem (object, size, const0_rtx, align,
2615 expected_align, expected_size))
2618 return set_storage_via_libcall (object, size, const0_rtx,
2619 method == BLOCK_OP_TAILCALL);
2625 clear_storage (rtx object, rtx size, enum block_op_methods method)
2627 return clear_storage_hints (object, size, method, 0, -1);
2631 /* A subroutine of clear_storage. Expand a call to memset.
2632 Return the return value of memset, 0 otherwise. */
2635 set_storage_via_libcall (rtx object, rtx size, rtx val, bool tailcall)
2637 tree call_expr, fn, object_tree, size_tree, val_tree;
2638 enum machine_mode size_mode;
2641 /* Emit code to copy OBJECT and SIZE into new pseudos. We can then
2642 place those into new pseudos into a VAR_DECL and use them later. */
2644 object = copy_to_mode_reg (Pmode, XEXP (object, 0));
2646 size_mode = TYPE_MODE (sizetype);
2647 size = convert_to_mode (size_mode, size, 1);
2648 size = copy_to_mode_reg (size_mode, size);
2650 /* It is incorrect to use the libcall calling conventions to call
2651 memset in this context. This could be a user call to memset and
2652 the user may wish to examine the return value from memset. For
2653 targets where libcalls and normal calls have different conventions
2654 for returning pointers, we could end up generating incorrect code. */
2656 object_tree = make_tree (ptr_type_node, object);
2657 if (GET_CODE (val) != CONST_INT)
2658 val = convert_to_mode (TYPE_MODE (integer_type_node), val, 1);
2659 size_tree = make_tree (sizetype, size);
2660 val_tree = make_tree (integer_type_node, val);
2662 fn = clear_storage_libcall_fn (true);
2663 call_expr = build_call_expr (fn, 3,
2664 object_tree, integer_zero_node, size_tree);
2665 CALL_EXPR_TAILCALL (call_expr) = tailcall;
2667 retval = expand_normal (call_expr);
2672 /* A subroutine of set_storage_via_libcall. Create the tree node
2673 for the function we use for block clears. The first time FOR_CALL
2674 is true, we call assemble_external. */
2676 static GTY(()) tree block_clear_fn;
2679 init_block_clear_fn (const char *asmspec)
2681 if (!block_clear_fn)
2685 fn = get_identifier ("memset");
2686 args = build_function_type_list (ptr_type_node, ptr_type_node,
2687 integer_type_node, sizetype,
2690 fn = build_decl (FUNCTION_DECL, fn, args);
2691 DECL_EXTERNAL (fn) = 1;
2692 TREE_PUBLIC (fn) = 1;
2693 DECL_ARTIFICIAL (fn) = 1;
2694 TREE_NOTHROW (fn) = 1;
2695 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
2696 DECL_VISIBILITY_SPECIFIED (fn) = 1;
2698 block_clear_fn = fn;
2702 set_user_assembler_name (block_clear_fn, asmspec);
2706 clear_storage_libcall_fn (int for_call)
2708 static bool emitted_extern;
2710 if (!block_clear_fn)
2711 init_block_clear_fn (NULL);
2713 if (for_call && !emitted_extern)
2715 emitted_extern = true;
2716 make_decl_rtl (block_clear_fn);
2717 assemble_external (block_clear_fn);
2720 return block_clear_fn;
2723 /* Expand a setmem pattern; return true if successful. */
2726 set_storage_via_setmem (rtx object, rtx size, rtx val, unsigned int align,
2727 unsigned int expected_align, HOST_WIDE_INT expected_size)
2729 /* Try the most limited insn first, because there's no point
2730 including more than one in the machine description unless
2731 the more limited one has some advantage. */
2733 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
2734 enum machine_mode mode;
2736 if (expected_align < align)
2737 expected_align = align;
2739 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
2740 mode = GET_MODE_WIDER_MODE (mode))
2742 enum insn_code code = setmem_optab[(int) mode];
2743 insn_operand_predicate_fn pred;
2745 if (code != CODE_FOR_nothing
2746 /* We don't need MODE to be narrower than
2747 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2748 the mode mask, as it is returned by the macro, it will
2749 definitely be less than the actual mode mask. */
2750 && ((GET_CODE (size) == CONST_INT
2751 && ((unsigned HOST_WIDE_INT) INTVAL (size)
2752 <= (GET_MODE_MASK (mode) >> 1)))
2753 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
2754 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
2755 || (*pred) (object, BLKmode))
2756 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
2757 || (*pred) (opalign, VOIDmode)))
2760 enum machine_mode char_mode;
2761 rtx last = get_last_insn ();
2764 opsize = convert_to_mode (mode, size, 1);
2765 pred = insn_data[(int) code].operand[1].predicate;
2766 if (pred != 0 && ! (*pred) (opsize, mode))
2767 opsize = copy_to_mode_reg (mode, opsize);
2770 char_mode = insn_data[(int) code].operand[2].mode;
2771 if (char_mode != VOIDmode)
2773 opchar = convert_to_mode (char_mode, opchar, 1);
2774 pred = insn_data[(int) code].operand[2].predicate;
2775 if (pred != 0 && ! (*pred) (opchar, char_mode))
2776 opchar = copy_to_mode_reg (char_mode, opchar);
2779 if (insn_data[(int) code].n_operands == 4)
2780 pat = GEN_FCN ((int) code) (object, opsize, opchar, opalign);
2782 pat = GEN_FCN ((int) code) (object, opsize, opchar, opalign,
2783 GEN_INT (expected_align),
2784 GEN_INT (expected_size));
2791 delete_insns_since (last);
2799 /* Write to one of the components of the complex value CPLX. Write VAL to
2800 the real part if IMAG_P is false, and the imaginary part if its true. */
2803 write_complex_part (rtx cplx, rtx val, bool imag_p)
2805 enum machine_mode cmode;
2806 enum machine_mode imode;
2809 if (GET_CODE (cplx) == CONCAT)
2811 emit_move_insn (XEXP (cplx, imag_p), val);
2815 cmode = GET_MODE (cplx);
2816 imode = GET_MODE_INNER (cmode);
2817 ibitsize = GET_MODE_BITSIZE (imode);
2819 /* For MEMs simplify_gen_subreg may generate an invalid new address
2820 because, e.g., the original address is considered mode-dependent
2821 by the target, which restricts simplify_subreg from invoking
2822 adjust_address_nv. Instead of preparing fallback support for an
2823 invalid address, we call adjust_address_nv directly. */
2826 emit_move_insn (adjust_address_nv (cplx, imode,
2827 imag_p ? GET_MODE_SIZE (imode) : 0),
2832 /* If the sub-object is at least word sized, then we know that subregging
2833 will work. This special case is important, since store_bit_field
2834 wants to operate on integer modes, and there's rarely an OImode to
2835 correspond to TCmode. */
2836 if (ibitsize >= BITS_PER_WORD
2837 /* For hard regs we have exact predicates. Assume we can split
2838 the original object if it spans an even number of hard regs.
2839 This special case is important for SCmode on 64-bit platforms
2840 where the natural size of floating-point regs is 32-bit. */
2842 && REGNO (cplx) < FIRST_PSEUDO_REGISTER
2843 && hard_regno_nregs[REGNO (cplx)][cmode] % 2 == 0))
2845 rtx part = simplify_gen_subreg (imode, cplx, cmode,
2846 imag_p ? GET_MODE_SIZE (imode) : 0);
2849 emit_move_insn (part, val);
2853 /* simplify_gen_subreg may fail for sub-word MEMs. */
2854 gcc_assert (MEM_P (cplx) && ibitsize < BITS_PER_WORD);
2857 store_bit_field (cplx, ibitsize, imag_p ? ibitsize : 0, imode, val);
2860 /* Extract one of the components of the complex value CPLX. Extract the
2861 real part if IMAG_P is false, and the imaginary part if it's true. */
2864 read_complex_part (rtx cplx, bool imag_p)
2866 enum machine_mode cmode, imode;
2869 if (GET_CODE (cplx) == CONCAT)
2870 return XEXP (cplx, imag_p);
2872 cmode = GET_MODE (cplx);
2873 imode = GET_MODE_INNER (cmode);
2874 ibitsize = GET_MODE_BITSIZE (imode);
2876 /* Special case reads from complex constants that got spilled to memory. */
2877 if (MEM_P (cplx) && GET_CODE (XEXP (cplx, 0)) == SYMBOL_REF)
2879 tree decl = SYMBOL_REF_DECL (XEXP (cplx, 0));
2880 if (decl && TREE_CODE (decl) == COMPLEX_CST)
2882 tree part = imag_p ? TREE_IMAGPART (decl) : TREE_REALPART (decl);
2883 if (CONSTANT_CLASS_P (part))
2884 return expand_expr (part, NULL_RTX, imode, EXPAND_NORMAL);
2888 /* For MEMs simplify_gen_subreg may generate an invalid new address
2889 because, e.g., the original address is considered mode-dependent
2890 by the target, which restricts simplify_subreg from invoking
2891 adjust_address_nv. Instead of preparing fallback support for an
2892 invalid address, we call adjust_address_nv directly. */
2894 return adjust_address_nv (cplx, imode,
2895 imag_p ? GET_MODE_SIZE (imode) : 0);
2897 /* If the sub-object is at least word sized, then we know that subregging
2898 will work. This special case is important, since extract_bit_field
2899 wants to operate on integer modes, and there's rarely an OImode to
2900 correspond to TCmode. */
2901 if (ibitsize >= BITS_PER_WORD
2902 /* For hard regs we have exact predicates. Assume we can split
2903 the original object if it spans an even number of hard regs.
2904 This special case is important for SCmode on 64-bit platforms
2905 where the natural size of floating-point regs is 32-bit. */
2907 && REGNO (cplx) < FIRST_PSEUDO_REGISTER
2908 && hard_regno_nregs[REGNO (cplx)][cmode] % 2 == 0))
2910 rtx ret = simplify_gen_subreg (imode, cplx, cmode,
2911 imag_p ? GET_MODE_SIZE (imode) : 0);
2915 /* simplify_gen_subreg may fail for sub-word MEMs. */
2916 gcc_assert (MEM_P (cplx) && ibitsize < BITS_PER_WORD);
2919 return extract_bit_field (cplx, ibitsize, imag_p ? ibitsize : 0,
2920 true, NULL_RTX, imode, imode);
2923 /* A subroutine of emit_move_insn_1. Yet another lowpart generator.
2924 NEW_MODE and OLD_MODE are the same size. Return NULL if X cannot be
2925 represented in NEW_MODE. If FORCE is true, this will never happen, as
2926 we'll force-create a SUBREG if needed. */
2929 emit_move_change_mode (enum machine_mode new_mode,
2930 enum machine_mode old_mode, rtx x, bool force)
2934 if (push_operand (x, GET_MODE (x)))
2936 ret = gen_rtx_MEM (new_mode, XEXP (x, 0));
2937 MEM_COPY_ATTRIBUTES (ret, x);
2941 /* We don't have to worry about changing the address since the
2942 size in bytes is supposed to be the same. */
2943 if (reload_in_progress)
2945 /* Copy the MEM to change the mode and move any
2946 substitutions from the old MEM to the new one. */
2947 ret = adjust_address_nv (x, new_mode, 0);
2948 copy_replacements (x, ret);
2951 ret = adjust_address (x, new_mode, 0);
2955 /* Note that we do want simplify_subreg's behavior of validating
2956 that the new mode is ok for a hard register. If we were to use
2957 simplify_gen_subreg, we would create the subreg, but would
2958 probably run into the target not being able to implement it. */
2959 /* Except, of course, when FORCE is true, when this is exactly what
2960 we want. Which is needed for CCmodes on some targets. */
2962 ret = simplify_gen_subreg (new_mode, x, old_mode, 0);
2964 ret = simplify_subreg (new_mode, x, old_mode, 0);
2970 /* A subroutine of emit_move_insn_1. Generate a move from Y into X using
2971 an integer mode of the same size as MODE. Returns the instruction
2972 emitted, or NULL if such a move could not be generated. */
2975 emit_move_via_integer (enum machine_mode mode, rtx x, rtx y, bool force)
2977 enum machine_mode imode;
2978 enum insn_code code;
2980 /* There must exist a mode of the exact size we require. */
2981 imode = int_mode_for_mode (mode);
2982 if (imode == BLKmode)
2985 /* The target must support moves in this mode. */
2986 code = optab_handler (mov_optab, imode)->insn_code;
2987 if (code == CODE_FOR_nothing)
2990 x = emit_move_change_mode (imode, mode, x, force);
2993 y = emit_move_change_mode (imode, mode, y, force);
2996 return emit_insn (GEN_FCN (code) (x, y));
2999 /* A subroutine of emit_move_insn_1. X is a push_operand in MODE.
3000 Return an equivalent MEM that does not use an auto-increment. */
3003 emit_move_resolve_push (enum machine_mode mode, rtx x)
3005 enum rtx_code code = GET_CODE (XEXP (x, 0));
3006 HOST_WIDE_INT adjust;
3009 adjust = GET_MODE_SIZE (mode);
3010 #ifdef PUSH_ROUNDING
3011 adjust = PUSH_ROUNDING (adjust);
3013 if (code == PRE_DEC || code == POST_DEC)
3015 else if (code == PRE_MODIFY || code == POST_MODIFY)
3017 rtx expr = XEXP (XEXP (x, 0), 1);
3020 gcc_assert (GET_CODE (expr) == PLUS || GET_CODE (expr) == MINUS);
3021 gcc_assert (GET_CODE (XEXP (expr, 1)) == CONST_INT);
3022 val = INTVAL (XEXP (expr, 1));
3023 if (GET_CODE (expr) == MINUS)
3025 gcc_assert (adjust == val || adjust == -val);
3029 /* Do not use anti_adjust_stack, since we don't want to update
3030 stack_pointer_delta. */
3031 temp = expand_simple_binop (Pmode, PLUS, stack_pointer_rtx,
3032 GEN_INT (adjust), stack_pointer_rtx,
3033 0, OPTAB_LIB_WIDEN);
3034 if (temp != stack_pointer_rtx)
3035 emit_move_insn (stack_pointer_rtx, temp);
3042 temp = stack_pointer_rtx;
3047 temp = plus_constant (stack_pointer_rtx, -adjust);
3053 return replace_equiv_address (x, temp);
3056 /* A subroutine of emit_move_complex. Generate a move from Y into X.
3057 X is known to satisfy push_operand, and MODE is known to be complex.
3058 Returns the last instruction emitted. */
3061 emit_move_complex_push (enum machine_mode mode, rtx x, rtx y)
3063 enum machine_mode submode = GET_MODE_INNER (mode);
3066 #ifdef PUSH_ROUNDING
3067 unsigned int submodesize = GET_MODE_SIZE (submode);
3069 /* In case we output to the stack, but the size is smaller than the
3070 machine can push exactly, we need to use move instructions. */
3071 if (PUSH_ROUNDING (submodesize) != submodesize)
3073 x = emit_move_resolve_push (mode, x);
3074 return emit_move_insn (x, y);
3078 /* Note that the real part always precedes the imag part in memory
3079 regardless of machine's endianness. */
3080 switch (GET_CODE (XEXP (x, 0)))
3094 emit_move_insn (gen_rtx_MEM (submode, XEXP (x, 0)),
3095 read_complex_part (y, imag_first));
3096 return emit_move_insn (gen_rtx_MEM (submode, XEXP (x, 0)),
3097 read_complex_part (y, !imag_first));
3100 /* A subroutine of emit_move_complex. Perform the move from Y to X
3101 via two moves of the parts. Returns the last instruction emitted. */
3104 emit_move_complex_parts (rtx x, rtx y)
3106 /* Show the output dies here. This is necessary for SUBREGs
3107 of pseudos since we cannot track their lifetimes correctly;
3108 hard regs shouldn't appear here except as return values. */
3109 if (!reload_completed && !reload_in_progress
3110 && REG_P (x) && !reg_overlap_mentioned_p (x, y))
3111 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
3113 write_complex_part (x, read_complex_part (y, false), false);
3114 write_complex_part (x, read_complex_part (y, true), true);
3116 return get_last_insn ();
3119 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3120 MODE is known to be complex. Returns the last instruction emitted. */
3123 emit_move_complex (enum machine_mode mode, rtx x, rtx y)
3127 /* Need to take special care for pushes, to maintain proper ordering
3128 of the data, and possibly extra padding. */
3129 if (push_operand (x, mode))
3130 return emit_move_complex_push (mode, x, y);
3132 /* See if we can coerce the target into moving both values at once. */
3134 /* Move floating point as parts. */
3135 if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
3136 && optab_handler (mov_optab, GET_MODE_INNER (mode))->insn_code != CODE_FOR_nothing)
3138 /* Not possible if the values are inherently not adjacent. */
3139 else if (GET_CODE (x) == CONCAT || GET_CODE (y) == CONCAT)
3141 /* Is possible if both are registers (or subregs of registers). */
3142 else if (register_operand (x, mode) && register_operand (y, mode))
3144 /* If one of the operands is a memory, and alignment constraints
3145 are friendly enough, we may be able to do combined memory operations.
3146 We do not attempt this if Y is a constant because that combination is
3147 usually better with the by-parts thing below. */
3148 else if ((MEM_P (x) ? !CONSTANT_P (y) : MEM_P (y))
3149 && (!STRICT_ALIGNMENT
3150 || get_mode_alignment (mode) == BIGGEST_ALIGNMENT))
3159 /* For memory to memory moves, optimal behavior can be had with the
3160 existing block move logic. */
3161 if (MEM_P (x) && MEM_P (y))
3163 emit_block_move (x, y, GEN_INT (GET_MODE_SIZE (mode)),
3164 BLOCK_OP_NO_LIBCALL);
3165 return get_last_insn ();
3168 ret = emit_move_via_integer (mode, x, y, true);
3173 return emit_move_complex_parts (x, y);
3176 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3177 MODE is known to be MODE_CC. Returns the last instruction emitted. */
3180 emit_move_ccmode (enum machine_mode mode, rtx x, rtx y)
3184 /* Assume all MODE_CC modes are equivalent; if we have movcc, use it. */
3187 enum insn_code code = optab_handler (mov_optab, CCmode)->insn_code;
3188 if (code != CODE_FOR_nothing)
3190 x = emit_move_change_mode (CCmode, mode, x, true);
3191 y = emit_move_change_mode (CCmode, mode, y, true);
3192 return emit_insn (GEN_FCN (code) (x, y));
3196 /* Otherwise, find the MODE_INT mode of the same width. */
3197 ret = emit_move_via_integer (mode, x, y, false);
3198 gcc_assert (ret != NULL);
3202 /* Return true if word I of OP lies entirely in the
3203 undefined bits of a paradoxical subreg. */
3206 undefined_operand_subword_p (const_rtx op, int i)
3208 enum machine_mode innermode, innermostmode;
3210 if (GET_CODE (op) != SUBREG)
3212 innermode = GET_MODE (op);
3213 innermostmode = GET_MODE (SUBREG_REG (op));
3214 offset = i * UNITS_PER_WORD + SUBREG_BYTE (op);
3215 /* The SUBREG_BYTE represents offset, as if the value were stored in
3216 memory, except for a paradoxical subreg where we define
3217 SUBREG_BYTE to be 0; undo this exception as in
3219 if (SUBREG_BYTE (op) == 0
3220 && GET_MODE_SIZE (innermostmode) < GET_MODE_SIZE (innermode))
3222 int difference = (GET_MODE_SIZE (innermostmode) - GET_MODE_SIZE (innermode));
3223 if (WORDS_BIG_ENDIAN)
3224 offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
3225 if (BYTES_BIG_ENDIAN)
3226 offset += difference % UNITS_PER_WORD;
3228 if (offset >= GET_MODE_SIZE (innermostmode)
3229 || offset <= -GET_MODE_SIZE (word_mode))
3234 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3235 MODE is any multi-word or full-word mode that lacks a move_insn
3236 pattern. Note that you will get better code if you define such
3237 patterns, even if they must turn into multiple assembler instructions. */
3240 emit_move_multi_word (enum machine_mode mode, rtx x, rtx y)
3247 gcc_assert (GET_MODE_SIZE (mode) >= UNITS_PER_WORD);
3249 /* If X is a push on the stack, do the push now and replace
3250 X with a reference to the stack pointer. */
3251 if (push_operand (x, mode))
3252 x = emit_move_resolve_push (mode, x);
3254 /* If we are in reload, see if either operand is a MEM whose address
3255 is scheduled for replacement. */
3256 if (reload_in_progress && MEM_P (x)
3257 && (inner = find_replacement (&XEXP (x, 0))) != XEXP (x, 0))
3258 x = replace_equiv_address_nv (x, inner);
3259 if (reload_in_progress && MEM_P (y)
3260 && (inner = find_replacement (&XEXP (y, 0))) != XEXP (y, 0))
3261 y = replace_equiv_address_nv (y, inner);
3265 need_clobber = false;
3267 i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
3270 rtx xpart = operand_subword (x, i, 1, mode);
3273 /* Do not generate code for a move if it would come entirely
3274 from the undefined bits of a paradoxical subreg. */
3275 if (undefined_operand_subword_p (y, i))
3278 ypart = operand_subword (y, i, 1, mode);
3280 /* If we can't get a part of Y, put Y into memory if it is a
3281 constant. Otherwise, force it into a register. Then we must
3282 be able to get a part of Y. */
3283 if (ypart == 0 && CONSTANT_P (y))
3285 y = use_anchored_address (force_const_mem (mode, y));
3286 ypart = operand_subword (y, i, 1, mode);
3288 else if (ypart == 0)
3289 ypart = operand_subword_force (y, i, mode);
3291 gcc_assert (xpart && ypart);
3293 need_clobber |= (GET_CODE (xpart) == SUBREG);
3295 last_insn = emit_move_insn (xpart, ypart);
3301 /* Show the output dies here. This is necessary for SUBREGs
3302 of pseudos since we cannot track their lifetimes correctly;
3303 hard regs shouldn't appear here except as return values.
3304 We never want to emit such a clobber after reload. */
3306 && ! (reload_in_progress || reload_completed)
3307 && need_clobber != 0)
3308 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
3315 /* Low level part of emit_move_insn.
3316 Called just like emit_move_insn, but assumes X and Y
3317 are basically valid. */
3320 emit_move_insn_1 (rtx x, rtx y)
3322 enum machine_mode mode = GET_MODE (x);
3323 enum insn_code code;
3325 gcc_assert ((unsigned int) mode < (unsigned int) MAX_MACHINE_MODE);
3327 code = optab_handler (mov_optab, mode)->insn_code;
3328 if (code != CODE_FOR_nothing)
3329 return emit_insn (GEN_FCN (code) (x, y));
3331 /* Expand complex moves by moving real part and imag part. */
3332 if (COMPLEX_MODE_P (mode))
3333 return emit_move_complex (mode, x, y);
3335 if (GET_MODE_CLASS (mode) == MODE_DECIMAL_FLOAT
3336 || ALL_FIXED_POINT_MODE_P (mode))
3338 rtx result = emit_move_via_integer (mode, x, y, true);
3340 /* If we can't find an integer mode, use multi words. */
3344 return emit_move_multi_word (mode, x, y);
3347 if (GET_MODE_CLASS (mode) == MODE_CC)
3348 return emit_move_ccmode (mode, x, y);
3350 /* Try using a move pattern for the corresponding integer mode. This is
3351 only safe when simplify_subreg can convert MODE constants into integer
3352 constants. At present, it can only do this reliably if the value
3353 fits within a HOST_WIDE_INT. */
3354 if (!CONSTANT_P (y) || GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
3356 rtx ret = emit_move_via_integer (mode, x, y, false);
3361 return emit_move_multi_word (mode, x, y);
3364 /* Generate code to copy Y into X.
3365 Both Y and X must have the same mode, except that
3366 Y can be a constant with VOIDmode.
3367 This mode cannot be BLKmode; use emit_block_move for that.
3369 Return the last instruction emitted. */
3372 emit_move_insn (rtx x, rtx y)
3374 enum machine_mode mode = GET_MODE (x);
3375 rtx y_cst = NULL_RTX;
3378 gcc_assert (mode != BLKmode
3379 && (GET_MODE (y) == mode || GET_MODE (y) == VOIDmode));
3384 && SCALAR_FLOAT_MODE_P (GET_MODE (x))
3385 && (last_insn = compress_float_constant (x, y)))
3390 if (!LEGITIMATE_CONSTANT_P (y))
3392 y = force_const_mem (mode, y);
3394 /* If the target's cannot_force_const_mem prevented the spill,
3395 assume that the target's move expanders will also take care
3396 of the non-legitimate constant. */
3400 y = use_anchored_address (y);
3404 /* If X or Y are memory references, verify that their addresses are valid
3407 && (! memory_address_p (GET_MODE (x), XEXP (x, 0))
3408 && ! push_operand (x, GET_MODE (x))))
3409 x = validize_mem (x);
3412 && ! memory_address_p (GET_MODE (y), XEXP (y, 0)))
3413 y = validize_mem (y);
3415 gcc_assert (mode != BLKmode);
3417 last_insn = emit_move_insn_1 (x, y);
3419 if (y_cst && REG_P (x)
3420 && (set = single_set (last_insn)) != NULL_RTX
3421 && SET_DEST (set) == x
3422 && ! rtx_equal_p (y_cst, SET_SRC (set)))
3423 set_unique_reg_note (last_insn, REG_EQUAL, y_cst);
3428 /* If Y is representable exactly in a narrower mode, and the target can
3429 perform the extension directly from constant or memory, then emit the
3430 move as an extension. */
3433 compress_float_constant (rtx x, rtx y)
3435 enum machine_mode dstmode = GET_MODE (x);
3436 enum machine_mode orig_srcmode = GET_MODE (y);
3437 enum machine_mode srcmode;
3439 int oldcost, newcost;
3441 REAL_VALUE_FROM_CONST_DOUBLE (r, y);
3443 if (LEGITIMATE_CONSTANT_P (y))
3444 oldcost = rtx_cost (y, SET);
3446 oldcost = rtx_cost (force_const_mem (dstmode, y), SET);
3448 for (srcmode = GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_srcmode));
3449 srcmode != orig_srcmode;
3450 srcmode = GET_MODE_WIDER_MODE (srcmode))
3453 rtx trunc_y, last_insn;
3455 /* Skip if the target can't extend this way. */
3456 ic = can_extend_p (dstmode, srcmode, 0);
3457 if (ic == CODE_FOR_nothing)
3460 /* Skip if the narrowed value isn't exact. */
3461 if (! exact_real_truncate (srcmode, &r))
3464 trunc_y = CONST_DOUBLE_FROM_REAL_VALUE (r, srcmode);
3466 if (LEGITIMATE_CONSTANT_P (trunc_y))
3468 /* Skip if the target needs extra instructions to perform
3470 if (! (*insn_data[ic].operand[1].predicate) (trunc_y, srcmode))
3472 /* This is valid, but may not be cheaper than the original. */
3473 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
3474 if (oldcost < newcost)
3477 else if (float_extend_from_mem[dstmode][srcmode])
3479 trunc_y = force_const_mem (srcmode, trunc_y);
3480 /* This is valid, but may not be cheaper than the original. */
3481 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
3482 if (oldcost < newcost)
3484 trunc_y = validize_mem (trunc_y);
3489 /* For CSE's benefit, force the compressed constant pool entry
3490 into a new pseudo. This constant may be used in different modes,
3491 and if not, combine will put things back together for us. */
3492 trunc_y = force_reg (srcmode, trunc_y);
3493 emit_unop_insn (ic, x, trunc_y, UNKNOWN);
3494 last_insn = get_last_insn ();
3497 set_unique_reg_note (last_insn, REG_EQUAL, y);
3505 /* Pushing data onto the stack. */
3507 /* Push a block of length SIZE (perhaps variable)
3508 and return an rtx to address the beginning of the block.
3509 The value may be virtual_outgoing_args_rtx.
3511 EXTRA is the number of bytes of padding to push in addition to SIZE.
3512 BELOW nonzero means this padding comes at low addresses;
3513 otherwise, the padding comes at high addresses. */
3516 push_block (rtx size, int extra, int below)
3520 size = convert_modes (Pmode, ptr_mode, size, 1);
3521 if (CONSTANT_P (size))
3522 anti_adjust_stack (plus_constant (size, extra));
3523 else if (REG_P (size) && extra == 0)
3524 anti_adjust_stack (size);
3527 temp = copy_to_mode_reg (Pmode, size);
3529 temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
3530 temp, 0, OPTAB_LIB_WIDEN);
3531 anti_adjust_stack (temp);
3534 #ifndef STACK_GROWS_DOWNWARD
3540 temp = virtual_outgoing_args_rtx;
3541 if (extra != 0 && below)
3542 temp = plus_constant (temp, extra);
3546 if (GET_CODE (size) == CONST_INT)
3547 temp = plus_constant (virtual_outgoing_args_rtx,
3548 -INTVAL (size) - (below ? 0 : extra));
3549 else if (extra != 0 && !below)
3550 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3551 negate_rtx (Pmode, plus_constant (size, extra)));
3553 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3554 negate_rtx (Pmode, size));
3557 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
3560 #ifdef PUSH_ROUNDING
3562 /* Emit single push insn. */
3565 emit_single_push_insn (enum machine_mode mode, rtx x, tree type)
3568 unsigned rounded_size = PUSH_ROUNDING (GET_MODE_SIZE (mode));
3570 enum insn_code icode;
3571 insn_operand_predicate_fn pred;
3573 stack_pointer_delta += PUSH_ROUNDING (GET_MODE_SIZE (mode));
3574 /* If there is push pattern, use it. Otherwise try old way of throwing
3575 MEM representing push operation to move expander. */
3576 icode = optab_handler (push_optab, mode)->insn_code;
3577 if (icode != CODE_FOR_nothing)
3579 if (((pred = insn_data[(int) icode].operand[0].predicate)
3580 && !((*pred) (x, mode))))
3581 x = force_reg (mode, x);
3582 emit_insn (GEN_FCN (icode) (x));
3585 if (GET_MODE_SIZE (mode) == rounded_size)
3586 dest_addr = gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
3587 /* If we are to pad downward, adjust the stack pointer first and
3588 then store X into the stack location using an offset. This is
3589 because emit_move_insn does not know how to pad; it does not have
3591 else if (FUNCTION_ARG_PADDING (mode, type) == downward)
3593 unsigned padding_size = rounded_size - GET_MODE_SIZE (mode);
3594 HOST_WIDE_INT offset;
3596 emit_move_insn (stack_pointer_rtx,
3597 expand_binop (Pmode,
3598 #ifdef STACK_GROWS_DOWNWARD
3604 GEN_INT (rounded_size),
3605 NULL_RTX, 0, OPTAB_LIB_WIDEN));
3607 offset = (HOST_WIDE_INT) padding_size;
3608 #ifdef STACK_GROWS_DOWNWARD
3609 if (STACK_PUSH_CODE == POST_DEC)
3610 /* We have already decremented the stack pointer, so get the
3612 offset += (HOST_WIDE_INT) rounded_size;
3614 if (STACK_PUSH_CODE == POST_INC)
3615 /* We have already incremented the stack pointer, so get the
3617 offset -= (HOST_WIDE_INT) rounded_size;
3619 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offset));
3623 #ifdef STACK_GROWS_DOWNWARD
3624 /* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC. */
3625 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3626 GEN_INT (-(HOST_WIDE_INT) rounded_size));
3628 /* ??? This seems wrong if STACK_PUSH_CODE == POST_INC. */
3629 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3630 GEN_INT (rounded_size));
3632 dest_addr = gen_rtx_PRE_MODIFY (Pmode, stack_pointer_rtx, dest_addr);
3635 dest = gen_rtx_MEM (mode, dest_addr);
3639 set_mem_attributes (dest, type, 1);
3641 if (flag_optimize_sibling_calls)
3642 /* Function incoming arguments may overlap with sibling call
3643 outgoing arguments and we cannot allow reordering of reads
3644 from function arguments with stores to outgoing arguments
3645 of sibling calls. */
3646 set_mem_alias_set (dest, 0);
3648 emit_move_insn (dest, x);
3652 /* Generate code to push X onto the stack, assuming it has mode MODE and
3654 MODE is redundant except when X is a CONST_INT (since they don't
3656 SIZE is an rtx for the size of data to be copied (in bytes),
3657 needed only if X is BLKmode.
3659 ALIGN (in bits) is maximum alignment we can assume.
3661 If PARTIAL and REG are both nonzero, then copy that many of the first
3662 bytes of X into registers starting with REG, and push the rest of X.
3663 The amount of space pushed is decreased by PARTIAL bytes.
3664 REG must be a hard register in this case.
3665 If REG is zero but PARTIAL is not, take any all others actions for an
3666 argument partially in registers, but do not actually load any
3669 EXTRA is the amount in bytes of extra space to leave next to this arg.
3670 This is ignored if an argument block has already been allocated.
3672 On a machine that lacks real push insns, ARGS_ADDR is the address of
3673 the bottom of the argument block for this call. We use indexing off there
3674 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
3675 argument block has not been preallocated.
3677 ARGS_SO_FAR is the size of args previously pushed for this call.
3679 REG_PARM_STACK_SPACE is nonzero if functions require stack space
3680 for arguments passed in registers. If nonzero, it will be the number
3681 of bytes required. */
3684 emit_push_insn (rtx x, enum machine_mode mode, tree type, rtx size,
3685 unsigned int align, int partial, rtx reg, int extra,
3686 rtx args_addr, rtx args_so_far, int reg_parm_stack_space,
3690 enum direction stack_direction
3691 #ifdef STACK_GROWS_DOWNWARD
3697 /* Decide where to pad the argument: `downward' for below,
3698 `upward' for above, or `none' for don't pad it.
3699 Default is below for small data on big-endian machines; else above. */
3700 enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
3702 /* Invert direction if stack is post-decrement.
3704 if (STACK_PUSH_CODE == POST_DEC)
3705 if (where_pad != none)
3706 where_pad = (where_pad == downward ? upward : downward);
3711 || (STRICT_ALIGNMENT && align < GET_MODE_ALIGNMENT (mode)))
3713 /* Copy a block into the stack, entirely or partially. */
3720 offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3721 used = partial - offset;
3723 if (mode != BLKmode)
3725 /* A value is to be stored in an insufficiently aligned
3726 stack slot; copy via a suitably aligned slot if
3728 size = GEN_INT (GET_MODE_SIZE (mode));
3729 if (!MEM_P (xinner))
3731 temp = assign_temp (type, 0, 1, 1);
3732 emit_move_insn (temp, xinner);
3739 /* USED is now the # of bytes we need not copy to the stack
3740 because registers will take care of them. */
3743 xinner = adjust_address (xinner, BLKmode, used);
3745 /* If the partial register-part of the arg counts in its stack size,
3746 skip the part of stack space corresponding to the registers.
3747 Otherwise, start copying to the beginning of the stack space,
3748 by setting SKIP to 0. */
3749 skip = (reg_parm_stack_space == 0) ? 0 : used;
3751 #ifdef PUSH_ROUNDING
3752 /* Do it with several push insns if that doesn't take lots of insns
3753 and if there is no difficulty with push insns that skip bytes
3754 on the stack for alignment purposes. */
3757 && GET_CODE (size) == CONST_INT
3759 && MEM_ALIGN (xinner) >= align
3760 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size) - used, align))
3761 /* Here we avoid the case of a structure whose weak alignment
3762 forces many pushes of a small amount of data,
3763 and such small pushes do rounding that causes trouble. */
3764 && ((! SLOW_UNALIGNED_ACCESS (word_mode, align))
3765 || align >= BIGGEST_ALIGNMENT
3766 || (PUSH_ROUNDING (align / BITS_PER_UNIT)
3767 == (align / BITS_PER_UNIT)))
3768 && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
3770 /* Push padding now if padding above and stack grows down,
3771 or if padding below and stack grows up.
3772 But if space already allocated, this has already been done. */
3773 if (extra && args_addr == 0
3774 && where_pad != none && where_pad != stack_direction)
3775 anti_adjust_stack (GEN_INT (extra));
3777 move_by_pieces (NULL, xinner, INTVAL (size) - used, align, 0);
3780 #endif /* PUSH_ROUNDING */
3784 /* Otherwise make space on the stack and copy the data
3785 to the address of that space. */
3787 /* Deduct words put into registers from the size we must copy. */
3790 if (GET_CODE (size) == CONST_INT)
3791 size = GEN_INT (INTVAL (size) - used);
3793 size = expand_binop (GET_MODE (size), sub_optab, size,
3794 GEN_INT (used), NULL_RTX, 0,
3798 /* Get the address of the stack space.
3799 In this case, we do not deal with EXTRA separately.
3800 A single stack adjust will do. */
3803 temp = push_block (size, extra, where_pad == downward);
3806 else if (GET_CODE (args_so_far) == CONST_INT)
3807 temp = memory_address (BLKmode,
3808 plus_constant (args_addr,
3809 skip + INTVAL (args_so_far)));
3811 temp = memory_address (BLKmode,
3812 plus_constant (gen_rtx_PLUS (Pmode,
3817 if (!ACCUMULATE_OUTGOING_ARGS)
3819 /* If the source is referenced relative to the stack pointer,
3820 copy it to another register to stabilize it. We do not need
3821 to do this if we know that we won't be changing sp. */
3823 if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
3824 || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
3825 temp = copy_to_reg (temp);
3828 target = gen_rtx_MEM (BLKmode, temp);
3830 /* We do *not* set_mem_attributes here, because incoming arguments
3831 may overlap with sibling call outgoing arguments and we cannot
3832 allow reordering of reads from function arguments with stores
3833 to outgoing arguments of sibling calls. We do, however, want
3834 to record the alignment of the stack slot. */
3835 /* ALIGN may well be better aligned than TYPE, e.g. due to
3836 PARM_BOUNDARY. Assume the caller isn't lying. */
3837 set_mem_align (target, align);
3839 emit_block_move (target, xinner, size, BLOCK_OP_CALL_PARM);
3842 else if (partial > 0)
3844 /* Scalar partly in registers. */
3846 int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
3849 /* # bytes of start of argument
3850 that we must make space for but need not store. */
3851 int offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3852 int args_offset = INTVAL (args_so_far);
3855 /* Push padding now if padding above and stack grows down,
3856 or if padding below and stack grows up.
3857 But if space already allocated, this has already been done. */
3858 if (extra && args_addr == 0
3859 && where_pad != none && where_pad != stack_direction)
3860 anti_adjust_stack (GEN_INT (extra));
3862 /* If we make space by pushing it, we might as well push
3863 the real data. Otherwise, we can leave OFFSET nonzero
3864 and leave the space uninitialized. */
3868 /* Now NOT_STACK gets the number of words that we don't need to
3869 allocate on the stack. Convert OFFSET to words too. */
3870 not_stack = (partial - offset) / UNITS_PER_WORD;
3871 offset /= UNITS_PER_WORD;
3873 /* If the partial register-part of the arg counts in its stack size,
3874 skip the part of stack space corresponding to the registers.
3875 Otherwise, start copying to the beginning of the stack space,
3876 by setting SKIP to 0. */
3877 skip = (reg_parm_stack_space == 0) ? 0 : not_stack;
3879 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
3880 x = validize_mem (force_const_mem (mode, x));
3882 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
3883 SUBREGs of such registers are not allowed. */
3884 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER
3885 && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
3886 x = copy_to_reg (x);
3888 /* Loop over all the words allocated on the stack for this arg. */
3889 /* We can do it by words, because any scalar bigger than a word
3890 has a size a multiple of a word. */
3891 #ifndef PUSH_ARGS_REVERSED
3892 for (i = not_stack; i < size; i++)
3894 for (i = size - 1; i >= not_stack; i--)
3896 if (i >= not_stack + offset)
3897 emit_push_insn (operand_subword_force (x, i, mode),
3898 word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
3900 GEN_INT (args_offset + ((i - not_stack + skip)
3902 reg_parm_stack_space, alignment_pad);
3909 /* Push padding now if padding above and stack grows down,
3910 or if padding below and stack grows up.
3911 But if space already allocated, this has already been done. */
3912 if (extra && args_addr == 0
3913 && where_pad != none && where_pad != stack_direction)
3914 anti_adjust_stack (GEN_INT (extra));
3916 #ifdef PUSH_ROUNDING
3917 if (args_addr == 0 && PUSH_ARGS)
3918 emit_single_push_insn (mode, x, type);
3922 if (GET_CODE (args_so_far) == CONST_INT)
3924 = memory_address (mode,
3925 plus_constant (args_addr,
3926 INTVAL (args_so_far)));
3928 addr = memory_address (mode, gen_rtx_PLUS (Pmode, args_addr,
3930 dest = gen_rtx_MEM (mode, addr);
3932 /* We do *not* set_mem_attributes here, because incoming arguments
3933 may overlap with sibling call outgoing arguments and we cannot
3934 allow reordering of reads from function arguments with stores
3935 to outgoing arguments of sibling calls. We do, however, want
3936 to record the alignment of the stack slot. */
3937 /* ALIGN may well be better aligned than TYPE, e.g. due to
3938 PARM_BOUNDARY. Assume the caller isn't lying. */
3939 set_mem_align (dest, align);
3941 emit_move_insn (dest, x);
3945 /* If part should go in registers, copy that part
3946 into the appropriate registers. Do this now, at the end,
3947 since mem-to-mem copies above may do function calls. */
3948 if (partial > 0 && reg != 0)
3950 /* Handle calls that pass values in multiple non-contiguous locations.
3951 The Irix 6 ABI has examples of this. */
3952 if (GET_CODE (reg) == PARALLEL)
3953 emit_group_load (reg, x, type, -1);
3956 gcc_assert (partial % UNITS_PER_WORD == 0);
3957 move_block_to_reg (REGNO (reg), x, partial / UNITS_PER_WORD, mode);
3961 if (extra && args_addr == 0 && where_pad == stack_direction)
3962 anti_adjust_stack (GEN_INT (extra));
3964 if (alignment_pad && args_addr == 0)
3965 anti_adjust_stack (alignment_pad);
3968 /* Return X if X can be used as a subtarget in a sequence of arithmetic
3972 get_subtarget (rtx x)
3976 /* Only registers can be subtargets. */
3978 /* Don't use hard regs to avoid extending their life. */
3979 || REGNO (x) < FIRST_PSEUDO_REGISTER
3983 /* A subroutine of expand_assignment. Optimize FIELD op= VAL, where
3984 FIELD is a bitfield. Returns true if the optimization was successful,
3985 and there's nothing else to do. */
3988 optimize_bitfield_assignment_op (unsigned HOST_WIDE_INT bitsize,
3989 unsigned HOST_WIDE_INT bitpos,
3990 enum machine_mode mode1, rtx str_rtx,
3993 enum machine_mode str_mode = GET_MODE (str_rtx);
3994 unsigned int str_bitsize = GET_MODE_BITSIZE (str_mode);
3999 if (mode1 != VOIDmode
4000 || bitsize >= BITS_PER_WORD
4001 || str_bitsize > BITS_PER_WORD
4002 || TREE_SIDE_EFFECTS (to)
4003 || TREE_THIS_VOLATILE (to))
4007 if (!BINARY_CLASS_P (src)
4008 || TREE_CODE (TREE_TYPE (src)) != INTEGER_TYPE)
4011 op0 = TREE_OPERAND (src, 0);
4012 op1 = TREE_OPERAND (src, 1);
4015 if (!operand_equal_p (to, op0, 0))
4018 if (MEM_P (str_rtx))
4020 unsigned HOST_WIDE_INT offset1;
4022 if (str_bitsize == 0 || str_bitsize > BITS_PER_WORD)
4023 str_mode = word_mode;
4024 str_mode = get_best_mode (bitsize, bitpos,
4025 MEM_ALIGN (str_rtx), str_mode, 0);
4026 if (str_mode == VOIDmode)
4028 str_bitsize = GET_MODE_BITSIZE (str_mode);
4031 bitpos %= str_bitsize;
4032 offset1 = (offset1 - bitpos) / BITS_PER_UNIT;
4033 str_rtx = adjust_address (str_rtx, str_mode, offset1);
4035 else if (!REG_P (str_rtx) && GET_CODE (str_rtx) != SUBREG)
4038 /* If the bit field covers the whole REG/MEM, store_field
4039 will likely generate better code. */
4040 if (bitsize >= str_bitsize)
4043 /* We can't handle fields split across multiple entities. */
4044 if (bitpos + bitsize > str_bitsize)
4047 if (BYTES_BIG_ENDIAN)
4048 bitpos = str_bitsize - bitpos - bitsize;
4050 switch (TREE_CODE (src))
4054 /* For now, just optimize the case of the topmost bitfield
4055 where we don't need to do any masking and also
4056 1 bit bitfields where xor can be used.
4057 We might win by one instruction for the other bitfields
4058 too if insv/extv instructions aren't used, so that
4059 can be added later. */
4060 if (bitpos + bitsize != str_bitsize
4061 && (bitsize != 1 || TREE_CODE (op1) != INTEGER_CST))
4064 value = expand_expr (op1, NULL_RTX, str_mode, EXPAND_NORMAL);
4065 value = convert_modes (str_mode,
4066 TYPE_MODE (TREE_TYPE (op1)), value,
4067 TYPE_UNSIGNED (TREE_TYPE (op1)));
4069 /* We may be accessing data outside the field, which means
4070 we can alias adjacent data. */
4071 if (MEM_P (str_rtx))
4073 str_rtx = shallow_copy_rtx (str_rtx);
4074 set_mem_alias_set (str_rtx, 0);
4075 set_mem_expr (str_rtx, 0);
4078 binop = TREE_CODE (src) == PLUS_EXPR ? add_optab : sub_optab;
4079 if (bitsize == 1 && bitpos + bitsize != str_bitsize)
4081 value = expand_and (str_mode, value, const1_rtx, NULL);
4084 value = expand_shift (LSHIFT_EXPR, str_mode, value,
4085 build_int_cst (NULL_TREE, bitpos),
4087 result = expand_binop (str_mode, binop, str_rtx,
4088 value, str_rtx, 1, OPTAB_WIDEN);
4089 if (result != str_rtx)
4090 emit_move_insn (str_rtx, result);
4095 if (TREE_CODE (op1) != INTEGER_CST)
4097 value = expand_expr (op1, NULL_RTX, GET_MODE (str_rtx), EXPAND_NORMAL);
4098 value = convert_modes (GET_MODE (str_rtx),
4099 TYPE_MODE (TREE_TYPE (op1)), value,
4100 TYPE_UNSIGNED (TREE_TYPE (op1)));
4102 /* We may be accessing data outside the field, which means
4103 we can alias adjacent data. */
4104 if (MEM_P (str_rtx))
4106 str_rtx = shallow_copy_rtx (str_rtx);
4107 set_mem_alias_set (str_rtx, 0);
4108 set_mem_expr (str_rtx, 0);
4111 binop = TREE_CODE (src) == BIT_IOR_EXPR ? ior_optab : xor_optab;
4112 if (bitpos + bitsize != GET_MODE_BITSIZE (GET_MODE (str_rtx)))
4114 rtx mask = GEN_INT (((unsigned HOST_WIDE_INT) 1 << bitsize)
4116 value = expand_and (GET_MODE (str_rtx), value, mask,
4119 value = expand_shift (LSHIFT_EXPR, GET_MODE (str_rtx), value,
4120 build_int_cst (NULL_TREE, bitpos),
4122 result = expand_binop (GET_MODE (str_rtx), binop, str_rtx,
4123 value, str_rtx, 1, OPTAB_WIDEN);
4124 if (result != str_rtx)
4125 emit_move_insn (str_rtx, result);
4136 /* Expand an assignment that stores the value of FROM into TO. If NONTEMPORAL
4137 is true, try generating a nontemporal store. */
4140 expand_assignment (tree to, tree from, bool nontemporal)
4145 /* Don't crash if the lhs of the assignment was erroneous. */
4146 if (TREE_CODE (to) == ERROR_MARK)
4148 result = expand_normal (from);
4152 /* Optimize away no-op moves without side-effects. */
4153 if (operand_equal_p (to, from, 0))
4156 /* Assignment of a structure component needs special treatment
4157 if the structure component's rtx is not simply a MEM.
4158 Assignment of an array element at a constant index, and assignment of
4159 an array element in an unaligned packed structure field, has the same
4161 if (handled_component_p (to)
4162 || TREE_CODE (TREE_TYPE (to)) == ARRAY_TYPE)
4164 enum machine_mode mode1;
4165 HOST_WIDE_INT bitsize, bitpos;
4172 tem = get_inner_reference (to, &bitsize, &bitpos, &offset, &mode1,
4173 &unsignedp, &volatilep, true);
4175 /* If we are going to use store_bit_field and extract_bit_field,
4176 make sure to_rtx will be safe for multiple use. */
4178 to_rtx = expand_normal (tem);
4184 if (!MEM_P (to_rtx))
4186 /* We can get constant negative offsets into arrays with broken
4187 user code. Translate this to a trap instead of ICEing. */
4188 gcc_assert (TREE_CODE (offset) == INTEGER_CST);
4189 expand_builtin_trap ();
4190 to_rtx = gen_rtx_MEM (BLKmode, const0_rtx);
4193 offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, EXPAND_SUM);
4194 #ifdef POINTERS_EXTEND_UNSIGNED
4195 if (GET_MODE (offset_rtx) != Pmode)
4196 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
4198 if (GET_MODE (offset_rtx) != ptr_mode)
4199 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
4202 /* A constant address in TO_RTX can have VOIDmode, we must not try
4203 to call force_reg for that case. Avoid that case. */
4205 && GET_MODE (to_rtx) == BLKmode
4206 && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
4208 && (bitpos % bitsize) == 0
4209 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
4210 && MEM_ALIGN (to_rtx) == GET_MODE_ALIGNMENT (mode1))
4212 to_rtx = adjust_address (to_rtx, mode1, bitpos / BITS_PER_UNIT);
4216 to_rtx = offset_address (to_rtx, offset_rtx,
4217 highest_pow2_factor_for_target (to,
4221 /* Handle expand_expr of a complex value returning a CONCAT. */
4222 if (GET_CODE (to_rtx) == CONCAT)
4224 if (TREE_CODE (TREE_TYPE (from)) == COMPLEX_TYPE)
4226 gcc_assert (bitpos == 0);
4227 result = store_expr (from, to_rtx, false, nontemporal);
4231 gcc_assert (bitpos == 0 || bitpos == GET_MODE_BITSIZE (mode1));
4232 result = store_expr (from, XEXP (to_rtx, bitpos != 0), false,
4240 /* If the field is at offset zero, we could have been given the
4241 DECL_RTX of the parent struct. Don't munge it. */
4242 to_rtx = shallow_copy_rtx (to_rtx);
4244 set_mem_attributes_minus_bitpos (to_rtx, to, 0, bitpos);
4246 /* Deal with volatile and readonly fields. The former is only
4247 done for MEM. Also set MEM_KEEP_ALIAS_SET_P if needed. */
4249 MEM_VOLATILE_P (to_rtx) = 1;
4250 if (component_uses_parent_alias_set (to))
4251 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
4254 if (optimize_bitfield_assignment_op (bitsize, bitpos, mode1,
4258 result = store_field (to_rtx, bitsize, bitpos, mode1, from,
4259 TREE_TYPE (tem), get_alias_set (to),
4264 preserve_temp_slots (result);
4270 /* If the rhs is a function call and its value is not an aggregate,
4271 call the function before we start to compute the lhs.
4272 This is needed for correct code for cases such as
4273 val = setjmp (buf) on machines where reference to val
4274 requires loading up part of an address in a separate insn.
4276 Don't do this if TO is a VAR_DECL or PARM_DECL whose DECL_RTL is REG
4277 since it might be a promoted variable where the zero- or sign- extension
4278 needs to be done. Handling this in the normal way is safe because no
4279 computation is done before the call. */
4280 if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from, from)
4281 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from))) == INTEGER_CST
4282 && ! ((TREE_CODE (to) == VAR_DECL || TREE_CODE (to) == PARM_DECL)
4283 && REG_P (DECL_RTL (to))))
4288 value = expand_normal (from);
4290 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4292 /* Handle calls that return values in multiple non-contiguous locations.
4293 The Irix 6 ABI has examples of this. */
4294 if (GET_CODE (to_rtx) == PARALLEL)
4295 emit_group_load (to_rtx, value, TREE_TYPE (from),
4296 int_size_in_bytes (TREE_TYPE (from)));
4297 else if (GET_MODE (to_rtx) == BLKmode)
4298 emit_block_move (to_rtx, value, expr_size (from), BLOCK_OP_NORMAL);
4301 if (POINTER_TYPE_P (TREE_TYPE (to)))
4302 value = convert_memory_address (GET_MODE (to_rtx), value);
4303 emit_move_insn (to_rtx, value);
4305 preserve_temp_slots (to_rtx);
4311 /* Ordinary treatment. Expand TO to get a REG or MEM rtx.
4312 Don't re-expand if it was expanded already (in COMPONENT_REF case). */
4315 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4317 /* Don't move directly into a return register. */
4318 if (TREE_CODE (to) == RESULT_DECL
4319 && (REG_P (to_rtx) || GET_CODE (to_rtx) == PARALLEL))
4324 temp = expand_expr (from, NULL_RTX, GET_MODE (to_rtx), EXPAND_NORMAL);
4326 if (GET_CODE (to_rtx) == PARALLEL)
4327 emit_group_load (to_rtx, temp, TREE_TYPE (from),
4328 int_size_in_bytes (TREE_TYPE (from)));
4330 emit_move_insn (to_rtx, temp);
4332 preserve_temp_slots (to_rtx);
4338 /* In case we are returning the contents of an object which overlaps
4339 the place the value is being stored, use a safe function when copying
4340 a value through a pointer into a structure value return block. */
4341 if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF
4342 && current_function_returns_struct
4343 && !current_function_returns_pcc_struct)
4348 size = expr_size (from);
4349 from_rtx = expand_normal (from);
4351 emit_library_call (memmove_libfunc, LCT_NORMAL,
4352 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
4353 XEXP (from_rtx, 0), Pmode,
4354 convert_to_mode (TYPE_MODE (sizetype),
4355 size, TYPE_UNSIGNED (sizetype)),
4356 TYPE_MODE (sizetype));
4358 preserve_temp_slots (to_rtx);
4364 /* Compute FROM and store the value in the rtx we got. */
4367 result = store_expr (from, to_rtx, 0, nontemporal);
4368 preserve_temp_slots (result);
4374 /* Emits nontemporal store insn that moves FROM to TO. Returns true if this
4375 succeeded, false otherwise. */
4378 emit_storent_insn (rtx to, rtx from)
4380 enum machine_mode mode = GET_MODE (to), imode;
4381 enum insn_code code = optab_handler (storent_optab, mode)->insn_code;
4384 if (code == CODE_FOR_nothing)
4387 imode = insn_data[code].operand[0].mode;
4388 if (!insn_data[code].operand[0].predicate (to, imode))
4391 imode = insn_data[code].operand[1].mode;
4392 if (!insn_data[code].operand[1].predicate (from, imode))
4394 from = copy_to_mode_reg (imode, from);
4395 if (!insn_data[code].operand[1].predicate (from, imode))
4399 pattern = GEN_FCN (code) (to, from);
4400 if (pattern == NULL_RTX)
4403 emit_insn (pattern);
4407 /* Generate code for computing expression EXP,
4408 and storing the value into TARGET.
4410 If the mode is BLKmode then we may return TARGET itself.
4411 It turns out that in BLKmode it doesn't cause a problem.
4412 because C has no operators that could combine two different
4413 assignments into the same BLKmode object with different values
4414 with no sequence point. Will other languages need this to
4417 If CALL_PARAM_P is nonzero, this is a store into a call param on the
4418 stack, and block moves may need to be treated specially.
4420 If NONTEMPORAL is true, try using a nontemporal store instruction. */
4423 store_expr (tree exp, rtx target, int call_param_p, bool nontemporal)
4426 rtx alt_rtl = NULL_RTX;
4427 int dont_return_target = 0;
4429 if (VOID_TYPE_P (TREE_TYPE (exp)))
4431 /* C++ can generate ?: expressions with a throw expression in one
4432 branch and an rvalue in the other. Here, we resolve attempts to
4433 store the throw expression's nonexistent result. */
4434 gcc_assert (!call_param_p);
4435 expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL);
4438 if (TREE_CODE (exp) == COMPOUND_EXPR)
4440 /* Perform first part of compound expression, then assign from second
4442 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
4443 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4444 return store_expr (TREE_OPERAND (exp, 1), target, call_param_p,
4447 else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
4449 /* For conditional expression, get safe form of the target. Then
4450 test the condition, doing the appropriate assignment on either
4451 side. This avoids the creation of unnecessary temporaries.
4452 For non-BLKmode, it is more efficient not to do this. */
4454 rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();
4456 do_pending_stack_adjust ();
4458 jumpifnot (TREE_OPERAND (exp, 0), lab1);
4459 store_expr (TREE_OPERAND (exp, 1), target, call_param_p,
4461 emit_jump_insn (gen_jump (lab2));
4464 store_expr (TREE_OPERAND (exp, 2), target, call_param_p,
4471 else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
4472 /* If this is a scalar in a register that is stored in a wider mode
4473 than the declared mode, compute the result into its declared mode
4474 and then convert to the wider mode. Our value is the computed
4477 rtx inner_target = 0;
4479 /* We can do the conversion inside EXP, which will often result
4480 in some optimizations. Do the conversion in two steps: first
4481 change the signedness, if needed, then the extend. But don't
4482 do this if the type of EXP is a subtype of something else
4483 since then the conversion might involve more than just
4484 converting modes. */
4485 if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
4486 && TREE_TYPE (TREE_TYPE (exp)) == 0
4487 && GET_MODE_PRECISION (GET_MODE (target))
4488 == TYPE_PRECISION (TREE_TYPE (exp)))
4490 if (TYPE_UNSIGNED (TREE_TYPE (exp))
4491 != SUBREG_PROMOTED_UNSIGNED_P (target))
4493 /* Some types, e.g. Fortran's logical*4, won't have a signed
4494 version, so use the mode instead. */
4496 = (signed_or_unsigned_type_for
4497 (SUBREG_PROMOTED_UNSIGNED_P (target), TREE_TYPE (exp)));
4499 ntype = lang_hooks.types.type_for_mode
4500 (TYPE_MODE (TREE_TYPE (exp)),
4501 SUBREG_PROMOTED_UNSIGNED_P (target));
4503 exp = fold_convert (ntype, exp);
4506 exp = fold_convert (lang_hooks.types.type_for_mode
4507 (GET_MODE (SUBREG_REG (target)),
4508 SUBREG_PROMOTED_UNSIGNED_P (target)),
4511 inner_target = SUBREG_REG (target);
4514 temp = expand_expr (exp, inner_target, VOIDmode,
4515 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4517 /* If TEMP is a VOIDmode constant, use convert_modes to make
4518 sure that we properly convert it. */
4519 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
4521 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4522 temp, SUBREG_PROMOTED_UNSIGNED_P (target));
4523 temp = convert_modes (GET_MODE (SUBREG_REG (target)),
4524 GET_MODE (target), temp,
4525 SUBREG_PROMOTED_UNSIGNED_P (target));
4528 convert_move (SUBREG_REG (target), temp,
4529 SUBREG_PROMOTED_UNSIGNED_P (target));
4533 else if (TREE_CODE (exp) == STRING_CST
4534 && !nontemporal && !call_param_p
4535 && TREE_STRING_LENGTH (exp) > 0
4536 && TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
4538 /* Optimize initialization of an array with a STRING_CST. */
4539 HOST_WIDE_INT exp_len, str_copy_len;
4542 exp_len = int_expr_size (exp);
4546 str_copy_len = strlen (TREE_STRING_POINTER (exp));
4547 if (str_copy_len < TREE_STRING_LENGTH (exp) - 1)
4550 str_copy_len = TREE_STRING_LENGTH (exp);
4551 if ((STORE_MAX_PIECES & (STORE_MAX_PIECES - 1)) == 0)
4553 str_copy_len += STORE_MAX_PIECES - 1;
4554 str_copy_len &= ~(STORE_MAX_PIECES - 1);
4556 str_copy_len = MIN (str_copy_len, exp_len);
4557 if (!can_store_by_pieces (str_copy_len, builtin_strncpy_read_str,
4558 (void *) TREE_STRING_POINTER (exp),
4559 MEM_ALIGN (target), false))
4564 dest_mem = store_by_pieces (dest_mem,
4565 str_copy_len, builtin_strncpy_read_str,
4566 (void *) TREE_STRING_POINTER (exp),
4567 MEM_ALIGN (target), false,
4568 exp_len > str_copy_len ? 1 : 0);
4569 if (exp_len > str_copy_len)
4570 clear_storage (adjust_address (dest_mem, BLKmode, 0),
4571 GEN_INT (exp_len - str_copy_len),
4580 /* If we want to use a nontemporal store, force the value to
4582 tmp_target = nontemporal ? NULL_RTX : target;
4583 temp = expand_expr_real (exp, tmp_target, GET_MODE (target),
4585 ? EXPAND_STACK_PARM : EXPAND_NORMAL),
4587 /* Return TARGET if it's a specified hardware register.
4588 If TARGET is a volatile mem ref, either return TARGET
4589 or return a reg copied *from* TARGET; ANSI requires this.
4591 Otherwise, if TEMP is not TARGET, return TEMP
4592 if it is constant (for efficiency),
4593 or if we really want the correct value. */
4594 if (!(target && REG_P (target)
4595 && REGNO (target) < FIRST_PSEUDO_REGISTER)
4596 && !(MEM_P (target) && MEM_VOLATILE_P (target))
4597 && ! rtx_equal_p (temp, target)
4598 && CONSTANT_P (temp))
4599 dont_return_target = 1;
4602 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
4603 the same as that of TARGET, adjust the constant. This is needed, for
4604 example, in case it is a CONST_DOUBLE and we want only a word-sized
4606 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode
4607 && TREE_CODE (exp) != ERROR_MARK
4608 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
4609 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4610 temp, TYPE_UNSIGNED (TREE_TYPE (exp)));
4612 /* If value was not generated in the target, store it there.
4613 Convert the value to TARGET's type first if necessary and emit the
4614 pending incrementations that have been queued when expanding EXP.
4615 Note that we cannot emit the whole queue blindly because this will
4616 effectively disable the POST_INC optimization later.
4618 If TEMP and TARGET compare equal according to rtx_equal_p, but
4619 one or both of them are volatile memory refs, we have to distinguish
4621 - expand_expr has used TARGET. In this case, we must not generate
4622 another copy. This can be detected by TARGET being equal according
4624 - expand_expr has not used TARGET - that means that the source just
4625 happens to have the same RTX form. Since temp will have been created
4626 by expand_expr, it will compare unequal according to == .
4627 We must generate a copy in this case, to reach the correct number
4628 of volatile memory references. */
4630 if ((! rtx_equal_p (temp, target)
4631 || (temp != target && (side_effects_p (temp)
4632 || side_effects_p (target))))
4633 && TREE_CODE (exp) != ERROR_MARK
4634 /* If store_expr stores a DECL whose DECL_RTL(exp) == TARGET,
4635 but TARGET is not valid memory reference, TEMP will differ
4636 from TARGET although it is really the same location. */
4637 && !(alt_rtl && rtx_equal_p (alt_rtl, target))
4638 /* If there's nothing to copy, don't bother. Don't call
4639 expr_size unless necessary, because some front-ends (C++)
4640 expr_size-hook must not be given objects that are not
4641 supposed to be bit-copied or bit-initialized. */
4642 && expr_size (exp) != const0_rtx)
4644 if (GET_MODE (temp) != GET_MODE (target)
4645 && GET_MODE (temp) != VOIDmode)
4647 int unsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
4648 if (dont_return_target)
4650 /* In this case, we will return TEMP,
4651 so make sure it has the proper mode.
4652 But don't forget to store the value into TARGET. */
4653 temp = convert_to_mode (GET_MODE (target), temp, unsignedp);
4654 emit_move_insn (target, temp);
4656 else if (GET_MODE (target) == BLKmode
4657 || GET_MODE (temp) == BLKmode)
4658 emit_block_move (target, temp, expr_size (exp),
4660 ? BLOCK_OP_CALL_PARM
4661 : BLOCK_OP_NORMAL));
4663 convert_move (target, temp, unsignedp);
4666 else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
4668 /* Handle copying a string constant into an array. The string
4669 constant may be shorter than the array. So copy just the string's
4670 actual length, and clear the rest. First get the size of the data
4671 type of the string, which is actually the size of the target. */
4672 rtx size = expr_size (exp);
4674 if (GET_CODE (size) == CONST_INT
4675 && INTVAL (size) < TREE_STRING_LENGTH (exp))
4676 emit_block_move (target, temp, size,
4678 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4681 /* Compute the size of the data to copy from the string. */
4683 = size_binop (MIN_EXPR,
4684 make_tree (sizetype, size),
4685 size_int (TREE_STRING_LENGTH (exp)));
4687 = expand_expr (copy_size, NULL_RTX, VOIDmode,
4689 ? EXPAND_STACK_PARM : EXPAND_NORMAL));
4692 /* Copy that much. */
4693 copy_size_rtx = convert_to_mode (ptr_mode, copy_size_rtx,
4694 TYPE_UNSIGNED (sizetype));
4695 emit_block_move (target, temp, copy_size_rtx,
4697 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4699 /* Figure out how much is left in TARGET that we have to clear.
4700 Do all calculations in ptr_mode. */
4701 if (GET_CODE (copy_size_rtx) == CONST_INT)
4703 size = plus_constant (size, -INTVAL (copy_size_rtx));
4704 target = adjust_address (target, BLKmode,
4705 INTVAL (copy_size_rtx));
4709 size = expand_binop (TYPE_MODE (sizetype), sub_optab, size,
4710 copy_size_rtx, NULL_RTX, 0,
4713 #ifdef POINTERS_EXTEND_UNSIGNED
4714 if (GET_MODE (copy_size_rtx) != Pmode)
4715 copy_size_rtx = convert_to_mode (Pmode, copy_size_rtx,
4716 TYPE_UNSIGNED (sizetype));
4719 target = offset_address (target, copy_size_rtx,
4720 highest_pow2_factor (copy_size));
4721 label = gen_label_rtx ();
4722 emit_cmp_and_jump_insns (size, const0_rtx, LT, NULL_RTX,
4723 GET_MODE (size), 0, label);
4726 if (size != const0_rtx)
4727 clear_storage (target, size, BLOCK_OP_NORMAL);
4733 /* Handle calls that return values in multiple non-contiguous locations.
4734 The Irix 6 ABI has examples of this. */
4735 else if (GET_CODE (target) == PARALLEL)
4736 emit_group_load (target, temp, TREE_TYPE (exp),
4737 int_size_in_bytes (TREE_TYPE (exp)));
4738 else if (GET_MODE (temp) == BLKmode)
4739 emit_block_move (target, temp, expr_size (exp),
4741 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4742 else if (nontemporal
4743 && emit_storent_insn (target, temp))
4744 /* If we managed to emit a nontemporal store, there is nothing else to
4749 temp = force_operand (temp, target);
4751 emit_move_insn (target, temp);
4758 /* Helper for categorize_ctor_elements. Identical interface. */
4761 categorize_ctor_elements_1 (const_tree ctor, HOST_WIDE_INT *p_nz_elts,
4762 HOST_WIDE_INT *p_elt_count,
4765 unsigned HOST_WIDE_INT idx;
4766 HOST_WIDE_INT nz_elts, elt_count;
4767 tree value, purpose;
4769 /* Whether CTOR is a valid constant initializer, in accordance with what
4770 initializer_constant_valid_p does. If inferred from the constructor
4771 elements, true until proven otherwise. */
4772 bool const_from_elts_p = constructor_static_from_elts_p (ctor);
4773 bool const_p = const_from_elts_p ? true : TREE_STATIC (ctor);
4778 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), idx, purpose, value)
4783 if (TREE_CODE (purpose) == RANGE_EXPR)
4785 tree lo_index = TREE_OPERAND (purpose, 0);
4786 tree hi_index = TREE_OPERAND (purpose, 1);
4788 if (host_integerp (lo_index, 1) && host_integerp (hi_index, 1))
4789 mult = (tree_low_cst (hi_index, 1)
4790 - tree_low_cst (lo_index, 1) + 1);
4793 switch (TREE_CODE (value))
4797 HOST_WIDE_INT nz = 0, ic = 0;
4800 = categorize_ctor_elements_1 (value, &nz, &ic, p_must_clear);
4802 nz_elts += mult * nz;
4803 elt_count += mult * ic;
4805 if (const_from_elts_p && const_p)
4806 const_p = const_elt_p;
4813 if (!initializer_zerop (value))
4819 nz_elts += mult * TREE_STRING_LENGTH (value);
4820 elt_count += mult * TREE_STRING_LENGTH (value);
4824 if (!initializer_zerop (TREE_REALPART (value)))
4826 if (!initializer_zerop (TREE_IMAGPART (value)))
4834 for (v = TREE_VECTOR_CST_ELTS (value); v; v = TREE_CHAIN (v))
4836 if (!initializer_zerop (TREE_VALUE (v)))
4847 if (const_from_elts_p && const_p)
4848 const_p = initializer_constant_valid_p (value, TREE_TYPE (value))
4855 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4856 || TREE_CODE (TREE_TYPE (ctor)) == QUAL_UNION_TYPE))
4859 bool clear_this = true;
4861 if (!VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)))
4863 /* We don't expect more than one element of the union to be
4864 initialized. Not sure what we should do otherwise... */
4865 gcc_assert (VEC_length (constructor_elt, CONSTRUCTOR_ELTS (ctor))
4868 init_sub_type = TREE_TYPE (VEC_index (constructor_elt,
4869 CONSTRUCTOR_ELTS (ctor),
4872 /* ??? We could look at each element of the union, and find the
4873 largest element. Which would avoid comparing the size of the
4874 initialized element against any tail padding in the union.
4875 Doesn't seem worth the effort... */
4876 if (simple_cst_equal (TYPE_SIZE (TREE_TYPE (ctor)),
4877 TYPE_SIZE (init_sub_type)) == 1)
4879 /* And now we have to find out if the element itself is fully
4880 constructed. E.g. for union { struct { int a, b; } s; } u
4881 = { .s = { .a = 1 } }. */
4882 if (elt_count == count_type_elements (init_sub_type, false))
4887 *p_must_clear = clear_this;
4890 *p_nz_elts += nz_elts;
4891 *p_elt_count += elt_count;
4896 /* Examine CTOR to discover:
4897 * how many scalar fields are set to nonzero values,
4898 and place it in *P_NZ_ELTS;
4899 * how many scalar fields in total are in CTOR,
4900 and place it in *P_ELT_COUNT.
4901 * if a type is a union, and the initializer from the constructor
4902 is not the largest element in the union, then set *p_must_clear.
4904 Return whether or not CTOR is a valid static constant initializer, the same
4905 as "initializer_constant_valid_p (CTOR, TREE_TYPE (CTOR)) != 0". */
4908 categorize_ctor_elements (const_tree ctor, HOST_WIDE_INT *p_nz_elts,
4909 HOST_WIDE_INT *p_elt_count,
4914 *p_must_clear = false;
4917 categorize_ctor_elements_1 (ctor, p_nz_elts, p_elt_count, p_must_clear);
4920 /* Count the number of scalars in TYPE. Return -1 on overflow or
4921 variable-sized. If ALLOW_FLEXARR is true, don't count flexible
4922 array member at the end of the structure. */
4925 count_type_elements (const_tree type, bool allow_flexarr)
4927 const HOST_WIDE_INT max = ~((HOST_WIDE_INT)1 << (HOST_BITS_PER_WIDE_INT-1));
4928 switch (TREE_CODE (type))
4932 tree telts = array_type_nelts (type);
4933 if (telts && host_integerp (telts, 1))
4935 HOST_WIDE_INT n = tree_low_cst (telts, 1) + 1;
4936 HOST_WIDE_INT m = count_type_elements (TREE_TYPE (type), false);
4939 else if (max / n > m)
4947 HOST_WIDE_INT n = 0, t;
4950 for (f = TYPE_FIELDS (type); f ; f = TREE_CHAIN (f))
4951 if (TREE_CODE (f) == FIELD_DECL)
4953 t = count_type_elements (TREE_TYPE (f), false);
4956 /* Check for structures with flexible array member. */
4957 tree tf = TREE_TYPE (f);
4959 && TREE_CHAIN (f) == NULL
4960 && TREE_CODE (tf) == ARRAY_TYPE
4962 && TYPE_MIN_VALUE (TYPE_DOMAIN (tf))
4963 && integer_zerop (TYPE_MIN_VALUE (TYPE_DOMAIN (tf)))
4964 && !TYPE_MAX_VALUE (TYPE_DOMAIN (tf))
4965 && int_size_in_bytes (type) >= 0)
4977 case QUAL_UNION_TYPE:
4984 return TYPE_VECTOR_SUBPARTS (type);
4988 case FIXED_POINT_TYPE:
4993 case REFERENCE_TYPE:
5005 /* Return 1 if EXP contains mostly (3/4) zeros. */
5008 mostly_zeros_p (const_tree exp)
5010 if (TREE_CODE (exp) == CONSTRUCTOR)
5013 HOST_WIDE_INT nz_elts, count, elts;
5016 categorize_ctor_elements (exp, &nz_elts, &count, &must_clear);
5020 elts = count_type_elements (TREE_TYPE (exp), false);
5022 return nz_elts < elts / 4;
5025 return initializer_zerop (exp);
5028 /* Return 1 if EXP contains all zeros. */
5031 all_zeros_p (const_tree exp)
5033 if (TREE_CODE (exp) == CONSTRUCTOR)
5036 HOST_WIDE_INT nz_elts, count;
5039 categorize_ctor_elements (exp, &nz_elts, &count, &must_clear);
5040 return nz_elts == 0;
5043 return initializer_zerop (exp);
5046 /* Helper function for store_constructor.
5047 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
5048 TYPE is the type of the CONSTRUCTOR, not the element type.
5049 CLEARED is as for store_constructor.
5050 ALIAS_SET is the alias set to use for any stores.
5052 This provides a recursive shortcut back to store_constructor when it isn't
5053 necessary to go through store_field. This is so that we can pass through
5054 the cleared field to let store_constructor know that we may not have to
5055 clear a substructure if the outer structure has already been cleared. */
5058 store_constructor_field (rtx target, unsigned HOST_WIDE_INT bitsize,
5059 HOST_WIDE_INT bitpos, enum machine_mode mode,
5060 tree exp, tree type, int cleared,
5061 alias_set_type alias_set)
5063 if (TREE_CODE (exp) == CONSTRUCTOR
5064 /* We can only call store_constructor recursively if the size and
5065 bit position are on a byte boundary. */
5066 && bitpos % BITS_PER_UNIT == 0
5067 && (bitsize > 0 && bitsize % BITS_PER_UNIT == 0)
5068 /* If we have a nonzero bitpos for a register target, then we just
5069 let store_field do the bitfield handling. This is unlikely to
5070 generate unnecessary clear instructions anyways. */
5071 && (bitpos == 0 || MEM_P (target)))
5075 = adjust_address (target,
5076 GET_MODE (target) == BLKmode
5078 % GET_MODE_ALIGNMENT (GET_MODE (target)))
5079 ? BLKmode : VOIDmode, bitpos / BITS_PER_UNIT);
5082 /* Update the alias set, if required. */
5083 if (MEM_P (target) && ! MEM_KEEP_ALIAS_SET_P (target)
5084 && MEM_ALIAS_SET (target) != 0)
5086 target = copy_rtx (target);
5087 set_mem_alias_set (target, alias_set);
5090 store_constructor (exp, target, cleared, bitsize / BITS_PER_UNIT);
5093 store_field (target, bitsize, bitpos, mode, exp, type, alias_set, false);
5096 /* Store the value of constructor EXP into the rtx TARGET.
5097 TARGET is either a REG or a MEM; we know it cannot conflict, since
5098 safe_from_p has been called.
5099 CLEARED is true if TARGET is known to have been zero'd.
5100 SIZE is the number of bytes of TARGET we are allowed to modify: this
5101 may not be the same as the size of EXP if we are assigning to a field
5102 which has been packed to exclude padding bits. */
5105 store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size)
5107 tree type = TREE_TYPE (exp);
5108 #ifdef WORD_REGISTER_OPERATIONS
5109 HOST_WIDE_INT exp_size = int_size_in_bytes (type);
5112 switch (TREE_CODE (type))
5116 case QUAL_UNION_TYPE:
5118 unsigned HOST_WIDE_INT idx;
5121 /* If size is zero or the target is already cleared, do nothing. */
5122 if (size == 0 || cleared)
5124 /* We either clear the aggregate or indicate the value is dead. */
5125 else if ((TREE_CODE (type) == UNION_TYPE
5126 || TREE_CODE (type) == QUAL_UNION_TYPE)
5127 && ! CONSTRUCTOR_ELTS (exp))
5128 /* If the constructor is empty, clear the union. */
5130 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
5134 /* If we are building a static constructor into a register,
5135 set the initial value as zero so we can fold the value into
5136 a constant. But if more than one register is involved,
5137 this probably loses. */
5138 else if (REG_P (target) && TREE_STATIC (exp)
5139 && GET_MODE_SIZE (GET_MODE (target)) <= UNITS_PER_WORD)
5141 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5145 /* If the constructor has fewer fields than the structure or
5146 if we are initializing the structure to mostly zeros, clear
5147 the whole structure first. Don't do this if TARGET is a
5148 register whose mode size isn't equal to SIZE since
5149 clear_storage can't handle this case. */
5151 && (((int)VEC_length (constructor_elt, CONSTRUCTOR_ELTS (exp))
5152 != fields_length (type))
5153 || mostly_zeros_p (exp))
5155 || ((HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (target))
5158 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5162 if (REG_P (target) && !cleared)
5163 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
5165 /* Store each element of the constructor into the
5166 corresponding field of TARGET. */
5167 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, field, value)
5169 enum machine_mode mode;
5170 HOST_WIDE_INT bitsize;
5171 HOST_WIDE_INT bitpos = 0;
5173 rtx to_rtx = target;
5175 /* Just ignore missing fields. We cleared the whole
5176 structure, above, if any fields are missing. */
5180 if (cleared && initializer_zerop (value))
5183 if (host_integerp (DECL_SIZE (field), 1))
5184 bitsize = tree_low_cst (DECL_SIZE (field), 1);
5188 mode = DECL_MODE (field);
5189 if (DECL_BIT_FIELD (field))
5192 offset = DECL_FIELD_OFFSET (field);
5193 if (host_integerp (offset, 0)
5194 && host_integerp (bit_position (field), 0))
5196 bitpos = int_bit_position (field);
5200 bitpos = tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 0);
5207 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (offset,
5208 make_tree (TREE_TYPE (exp),
5211 offset_rtx = expand_normal (offset);
5212 gcc_assert (MEM_P (to_rtx));
5214 #ifdef POINTERS_EXTEND_UNSIGNED
5215 if (GET_MODE (offset_rtx) != Pmode)
5216 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
5218 if (GET_MODE (offset_rtx) != ptr_mode)
5219 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
5222 to_rtx = offset_address (to_rtx, offset_rtx,
5223 highest_pow2_factor (offset));
5226 #ifdef WORD_REGISTER_OPERATIONS
5227 /* If this initializes a field that is smaller than a
5228 word, at the start of a word, try to widen it to a full
5229 word. This special case allows us to output C++ member
5230 function initializations in a form that the optimizers
5233 && bitsize < BITS_PER_WORD
5234 && bitpos % BITS_PER_WORD == 0
5235 && GET_MODE_CLASS (mode) == MODE_INT
5236 && TREE_CODE (value) == INTEGER_CST
5238 && bitpos + BITS_PER_WORD <= exp_size * BITS_PER_UNIT)
5240 tree type = TREE_TYPE (value);
5242 if (TYPE_PRECISION (type) < BITS_PER_WORD)
5244 type = lang_hooks.types.type_for_size
5245 (BITS_PER_WORD, TYPE_UNSIGNED (type));
5246 value = fold_convert (type, value);
5249 if (BYTES_BIG_ENDIAN)
5251 = fold_build2 (LSHIFT_EXPR, type, value,
5252 build_int_cst (type,
5253 BITS_PER_WORD - bitsize));
5254 bitsize = BITS_PER_WORD;
5259 if (MEM_P (to_rtx) && !MEM_KEEP_ALIAS_SET_P (to_rtx)
5260 && DECL_NONADDRESSABLE_P (field))
5262 to_rtx = copy_rtx (to_rtx);
5263 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
5266 store_constructor_field (to_rtx, bitsize, bitpos, mode,
5267 value, type, cleared,
5268 get_alias_set (TREE_TYPE (field)));
5275 unsigned HOST_WIDE_INT i;
5278 tree elttype = TREE_TYPE (type);
5280 HOST_WIDE_INT minelt = 0;
5281 HOST_WIDE_INT maxelt = 0;
5283 domain = TYPE_DOMAIN (type);
5284 const_bounds_p = (TYPE_MIN_VALUE (domain)
5285 && TYPE_MAX_VALUE (domain)
5286 && host_integerp (TYPE_MIN_VALUE (domain), 0)
5287 && host_integerp (TYPE_MAX_VALUE (domain), 0));
5289 /* If we have constant bounds for the range of the type, get them. */
5292 minelt = tree_low_cst (TYPE_MIN_VALUE (domain), 0);
5293 maxelt = tree_low_cst (TYPE_MAX_VALUE (domain), 0);
5296 /* If the constructor has fewer elements than the array, clear
5297 the whole array first. Similarly if this is static
5298 constructor of a non-BLKmode object. */
5301 else if (REG_P (target) && TREE_STATIC (exp))
5305 unsigned HOST_WIDE_INT idx;
5307 HOST_WIDE_INT count = 0, zero_count = 0;
5308 need_to_clear = ! const_bounds_p;
5310 /* This loop is a more accurate version of the loop in
5311 mostly_zeros_p (it handles RANGE_EXPR in an index). It
5312 is also needed to check for missing elements. */
5313 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, index, value)
5315 HOST_WIDE_INT this_node_count;
5320 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5322 tree lo_index = TREE_OPERAND (index, 0);
5323 tree hi_index = TREE_OPERAND (index, 1);
5325 if (! host_integerp (lo_index, 1)
5326 || ! host_integerp (hi_index, 1))
5332 this_node_count = (tree_low_cst (hi_index, 1)
5333 - tree_low_cst (lo_index, 1) + 1);
5336 this_node_count = 1;
5338 count += this_node_count;
5339 if (mostly_zeros_p (value))
5340 zero_count += this_node_count;
5343 /* Clear the entire array first if there are any missing
5344 elements, or if the incidence of zero elements is >=
5347 && (count < maxelt - minelt + 1
5348 || 4 * zero_count >= 3 * count))
5352 if (need_to_clear && size > 0)
5355 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5357 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5361 if (!cleared && REG_P (target))
5362 /* Inform later passes that the old value is dead. */
5363 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
5365 /* Store each element of the constructor into the
5366 corresponding element of TARGET, determined by counting the
5368 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), i, index, value)
5370 enum machine_mode mode;
5371 HOST_WIDE_INT bitsize;
5372 HOST_WIDE_INT bitpos;
5374 rtx xtarget = target;
5376 if (cleared && initializer_zerop (value))
5379 unsignedp = TYPE_UNSIGNED (elttype);
5380 mode = TYPE_MODE (elttype);
5381 if (mode == BLKmode)
5382 bitsize = (host_integerp (TYPE_SIZE (elttype), 1)
5383 ? tree_low_cst (TYPE_SIZE (elttype), 1)
5386 bitsize = GET_MODE_BITSIZE (mode);
5388 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5390 tree lo_index = TREE_OPERAND (index, 0);
5391 tree hi_index = TREE_OPERAND (index, 1);
5392 rtx index_r, pos_rtx;
5393 HOST_WIDE_INT lo, hi, count;
5396 /* If the range is constant and "small", unroll the loop. */
5398 && host_integerp (lo_index, 0)
5399 && host_integerp (hi_index, 0)
5400 && (lo = tree_low_cst (lo_index, 0),
5401 hi = tree_low_cst (hi_index, 0),
5402 count = hi - lo + 1,
5405 || (host_integerp (TYPE_SIZE (elttype), 1)
5406 && (tree_low_cst (TYPE_SIZE (elttype), 1) * count
5409 lo -= minelt; hi -= minelt;
5410 for (; lo <= hi; lo++)
5412 bitpos = lo * tree_low_cst (TYPE_SIZE (elttype), 0);
5415 && !MEM_KEEP_ALIAS_SET_P (target)
5416 && TREE_CODE (type) == ARRAY_TYPE
5417 && TYPE_NONALIASED_COMPONENT (type))
5419 target = copy_rtx (target);
5420 MEM_KEEP_ALIAS_SET_P (target) = 1;
5423 store_constructor_field
5424 (target, bitsize, bitpos, mode, value, type, cleared,
5425 get_alias_set (elttype));
5430 rtx loop_start = gen_label_rtx ();
5431 rtx loop_end = gen_label_rtx ();
5434 expand_normal (hi_index);
5435 unsignedp = TYPE_UNSIGNED (domain);
5437 index = build_decl (VAR_DECL, NULL_TREE, domain);
5440 = gen_reg_rtx (promote_mode (domain, DECL_MODE (index),
5442 SET_DECL_RTL (index, index_r);
5443 store_expr (lo_index, index_r, 0, false);
5445 /* Build the head of the loop. */
5446 do_pending_stack_adjust ();
5447 emit_label (loop_start);
5449 /* Assign value to element index. */
5451 fold_convert (ssizetype,
5452 fold_build2 (MINUS_EXPR,
5455 TYPE_MIN_VALUE (domain)));
5458 size_binop (MULT_EXPR, position,
5459 fold_convert (ssizetype,
5460 TYPE_SIZE_UNIT (elttype)));
5462 pos_rtx = expand_normal (position);
5463 xtarget = offset_address (target, pos_rtx,
5464 highest_pow2_factor (position));
5465 xtarget = adjust_address (xtarget, mode, 0);
5466 if (TREE_CODE (value) == CONSTRUCTOR)
5467 store_constructor (value, xtarget, cleared,
5468 bitsize / BITS_PER_UNIT);
5470 store_expr (value, xtarget, 0, false);
5472 /* Generate a conditional jump to exit the loop. */
5473 exit_cond = build2 (LT_EXPR, integer_type_node,
5475 jumpif (exit_cond, loop_end);
5477 /* Update the loop counter, and jump to the head of
5479 expand_assignment (index,
5480 build2 (PLUS_EXPR, TREE_TYPE (index),
5481 index, integer_one_node),
5484 emit_jump (loop_start);
5486 /* Build the end of the loop. */
5487 emit_label (loop_end);
5490 else if ((index != 0 && ! host_integerp (index, 0))
5491 || ! host_integerp (TYPE_SIZE (elttype), 1))
5496 index = ssize_int (1);
5499 index = fold_convert (ssizetype,
5500 fold_build2 (MINUS_EXPR,
5503 TYPE_MIN_VALUE (domain)));
5506 size_binop (MULT_EXPR, index,
5507 fold_convert (ssizetype,
5508 TYPE_SIZE_UNIT (elttype)));
5509 xtarget = offset_address (target,
5510 expand_normal (position),
5511 highest_pow2_factor (position));
5512 xtarget = adjust_address (xtarget, mode, 0);
5513 store_expr (value, xtarget, 0, false);
5518 bitpos = ((tree_low_cst (index, 0) - minelt)
5519 * tree_low_cst (TYPE_SIZE (elttype), 1));
5521 bitpos = (i * tree_low_cst (TYPE_SIZE (elttype), 1));
5523 if (MEM_P (target) && !MEM_KEEP_ALIAS_SET_P (target)
5524 && TREE_CODE (type) == ARRAY_TYPE
5525 && TYPE_NONALIASED_COMPONENT (type))
5527 target = copy_rtx (target);
5528 MEM_KEEP_ALIAS_SET_P (target) = 1;
5530 store_constructor_field (target, bitsize, bitpos, mode, value,
5531 type, cleared, get_alias_set (elttype));
5539 unsigned HOST_WIDE_INT idx;
5540 constructor_elt *ce;
5544 tree elttype = TREE_TYPE (type);
5545 int elt_size = tree_low_cst (TYPE_SIZE (elttype), 1);
5546 enum machine_mode eltmode = TYPE_MODE (elttype);
5547 HOST_WIDE_INT bitsize;
5548 HOST_WIDE_INT bitpos;
5549 rtvec vector = NULL;
5552 gcc_assert (eltmode != BLKmode);
5554 n_elts = TYPE_VECTOR_SUBPARTS (type);
5555 if (REG_P (target) && VECTOR_MODE_P (GET_MODE (target)))
5557 enum machine_mode mode = GET_MODE (target);
5559 icode = (int) optab_handler (vec_init_optab, mode)->insn_code;
5560 if (icode != CODE_FOR_nothing)
5564 vector = rtvec_alloc (n_elts);
5565 for (i = 0; i < n_elts; i++)
5566 RTVEC_ELT (vector, i) = CONST0_RTX (GET_MODE_INNER (mode));
5570 /* If the constructor has fewer elements than the vector,
5571 clear the whole array first. Similarly if this is static
5572 constructor of a non-BLKmode object. */
5575 else if (REG_P (target) && TREE_STATIC (exp))
5579 unsigned HOST_WIDE_INT count = 0, zero_count = 0;
5582 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
5584 int n_elts_here = tree_low_cst
5585 (int_const_binop (TRUNC_DIV_EXPR,
5586 TYPE_SIZE (TREE_TYPE (value)),
5587 TYPE_SIZE (elttype), 0), 1);
5589 count += n_elts_here;
5590 if (mostly_zeros_p (value))
5591 zero_count += n_elts_here;
5594 /* Clear the entire vector first if there are any missing elements,
5595 or if the incidence of zero elements is >= 75%. */
5596 need_to_clear = (count < n_elts || 4 * zero_count >= 3 * count);
5599 if (need_to_clear && size > 0 && !vector)
5602 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5604 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5608 /* Inform later passes that the old value is dead. */
5609 if (!cleared && !vector && REG_P (target))
5610 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5612 /* Store each element of the constructor into the corresponding
5613 element of TARGET, determined by counting the elements. */
5614 for (idx = 0, i = 0;
5615 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
5616 idx++, i += bitsize / elt_size)
5618 HOST_WIDE_INT eltpos;
5619 tree value = ce->value;
5621 bitsize = tree_low_cst (TYPE_SIZE (TREE_TYPE (value)), 1);
5622 if (cleared && initializer_zerop (value))
5626 eltpos = tree_low_cst (ce->index, 1);
5632 /* Vector CONSTRUCTORs should only be built from smaller
5633 vectors in the case of BLKmode vectors. */
5634 gcc_assert (TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE);
5635 RTVEC_ELT (vector, eltpos)
5636 = expand_normal (value);
5640 enum machine_mode value_mode =
5641 TREE_CODE (TREE_TYPE (value)) == VECTOR_TYPE
5642 ? TYPE_MODE (TREE_TYPE (value))
5644 bitpos = eltpos * elt_size;
5645 store_constructor_field (target, bitsize, bitpos,
5646 value_mode, value, type,
5647 cleared, get_alias_set (elttype));
5652 emit_insn (GEN_FCN (icode)
5654 gen_rtx_PARALLEL (GET_MODE (target), vector)));
5663 /* Store the value of EXP (an expression tree)
5664 into a subfield of TARGET which has mode MODE and occupies
5665 BITSIZE bits, starting BITPOS bits from the start of TARGET.
5666 If MODE is VOIDmode, it means that we are storing into a bit-field.
5668 Always return const0_rtx unless we have something particular to
5671 TYPE is the type of the underlying object,
5673 ALIAS_SET is the alias set for the destination. This value will
5674 (in general) be different from that for TARGET, since TARGET is a
5675 reference to the containing structure.
5677 If NONTEMPORAL is true, try generating a nontemporal store. */
5680 store_field (rtx target, HOST_WIDE_INT bitsize, HOST_WIDE_INT bitpos,
5681 enum machine_mode mode, tree exp, tree type,
5682 alias_set_type alias_set, bool nontemporal)
5684 HOST_WIDE_INT width_mask = 0;
5686 if (TREE_CODE (exp) == ERROR_MARK)
5689 /* If we have nothing to store, do nothing unless the expression has
5692 return expand_expr (exp, const0_rtx, VOIDmode, EXPAND_NORMAL);
5693 else if (bitsize >= 0 && bitsize < HOST_BITS_PER_WIDE_INT)
5694 width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1;
5696 /* If we are storing into an unaligned field of an aligned union that is
5697 in a register, we may have the mode of TARGET being an integer mode but
5698 MODE == BLKmode. In that case, get an aligned object whose size and
5699 alignment are the same as TARGET and store TARGET into it (we can avoid
5700 the store if the field being stored is the entire width of TARGET). Then
5701 call ourselves recursively to store the field into a BLKmode version of
5702 that object. Finally, load from the object into TARGET. This is not
5703 very efficient in general, but should only be slightly more expensive
5704 than the otherwise-required unaligned accesses. Perhaps this can be
5705 cleaned up later. It's tempting to make OBJECT readonly, but it's set
5706 twice, once with emit_move_insn and once via store_field. */
5709 && (REG_P (target) || GET_CODE (target) == SUBREG))
5711 rtx object = assign_temp (type, 0, 1, 1);
5712 rtx blk_object = adjust_address (object, BLKmode, 0);
5714 if (bitsize != (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (target)))
5715 emit_move_insn (object, target);
5717 store_field (blk_object, bitsize, bitpos, mode, exp, type, alias_set,
5720 emit_move_insn (target, object);
5722 /* We want to return the BLKmode version of the data. */
5726 if (GET_CODE (target) == CONCAT)
5728 /* We're storing into a struct containing a single __complex. */
5730 gcc_assert (!bitpos);
5731 return store_expr (exp, target, 0, nontemporal);
5734 /* If the structure is in a register or if the component
5735 is a bit field, we cannot use addressing to access it.
5736 Use bit-field techniques or SUBREG to store in it. */
5738 if (mode == VOIDmode
5739 || (mode != BLKmode && ! direct_store[(int) mode]
5740 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
5741 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
5743 || GET_CODE (target) == SUBREG
5744 /* If the field isn't aligned enough to store as an ordinary memref,
5745 store it as a bit field. */
5747 && ((((MEM_ALIGN (target) < GET_MODE_ALIGNMENT (mode))
5748 || bitpos % GET_MODE_ALIGNMENT (mode))
5749 && SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (target)))
5750 || (bitpos % BITS_PER_UNIT != 0)))
5751 /* If the RHS and field are a constant size and the size of the
5752 RHS isn't the same size as the bitfield, we must use bitfield
5755 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
5756 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) != 0))
5760 /* If EXP is a NOP_EXPR of precision less than its mode, then that
5761 implies a mask operation. If the precision is the same size as
5762 the field we're storing into, that mask is redundant. This is
5763 particularly common with bit field assignments generated by the
5765 if (TREE_CODE (exp) == NOP_EXPR)
5767 tree type = TREE_TYPE (exp);
5768 if (INTEGRAL_TYPE_P (type)
5769 && TYPE_PRECISION (type) < GET_MODE_BITSIZE (TYPE_MODE (type))
5770 && bitsize == TYPE_PRECISION (type))
5772 type = TREE_TYPE (TREE_OPERAND (exp, 0));
5773 if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) >= bitsize)
5774 exp = TREE_OPERAND (exp, 0);
5778 temp = expand_normal (exp);
5780 /* If BITSIZE is narrower than the size of the type of EXP
5781 we will be narrowing TEMP. Normally, what's wanted are the
5782 low-order bits. However, if EXP's type is a record and this is
5783 big-endian machine, we want the upper BITSIZE bits. */
5784 if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
5785 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (temp))
5786 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
5787 temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
5788 size_int (GET_MODE_BITSIZE (GET_MODE (temp))
5792 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
5794 if (mode != VOIDmode && mode != BLKmode
5795 && mode != TYPE_MODE (TREE_TYPE (exp)))
5796 temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1);
5798 /* If the modes of TARGET and TEMP are both BLKmode, both
5799 must be in memory and BITPOS must be aligned on a byte
5800 boundary. If so, we simply do a block copy. */
5801 if (GET_MODE (target) == BLKmode && GET_MODE (temp) == BLKmode)
5803 gcc_assert (MEM_P (target) && MEM_P (temp)
5804 && !(bitpos % BITS_PER_UNIT));
5806 target = adjust_address (target, VOIDmode, bitpos / BITS_PER_UNIT);
5807 emit_block_move (target, temp,
5808 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
5815 /* Store the value in the bitfield. */
5816 store_bit_field (target, bitsize, bitpos, mode, temp);
5822 /* Now build a reference to just the desired component. */
5823 rtx to_rtx = adjust_address (target, mode, bitpos / BITS_PER_UNIT);
5825 if (to_rtx == target)
5826 to_rtx = copy_rtx (to_rtx);
5828 MEM_SET_IN_STRUCT_P (to_rtx, 1);
5829 if (!MEM_KEEP_ALIAS_SET_P (to_rtx) && MEM_ALIAS_SET (to_rtx) != 0)
5830 set_mem_alias_set (to_rtx, alias_set);
5832 return store_expr (exp, to_rtx, 0, nontemporal);
5836 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
5837 an ARRAY_REF, or an ARRAY_RANGE_REF, look for nested operations of these
5838 codes and find the ultimate containing object, which we return.
5840 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
5841 bit position, and *PUNSIGNEDP to the signedness of the field.
5842 If the position of the field is variable, we store a tree
5843 giving the variable offset (in units) in *POFFSET.
5844 This offset is in addition to the bit position.
5845 If the position is not variable, we store 0 in *POFFSET.
5847 If any of the extraction expressions is volatile,
5848 we store 1 in *PVOLATILEP. Otherwise we don't change that.
5850 If the field is a bit-field, *PMODE is set to VOIDmode. Otherwise, it
5851 is a mode that can be used to access the field. In that case, *PBITSIZE
5854 If the field describes a variable-sized object, *PMODE is set to
5855 VOIDmode and *PBITSIZE is set to -1. An access cannot be made in
5856 this case, but the address of the object can be found.
5858 If KEEP_ALIGNING is true and the target is STRICT_ALIGNMENT, we don't
5859 look through nodes that serve as markers of a greater alignment than
5860 the one that can be deduced from the expression. These nodes make it
5861 possible for front-ends to prevent temporaries from being created by
5862 the middle-end on alignment considerations. For that purpose, the
5863 normal operating mode at high-level is to always pass FALSE so that
5864 the ultimate containing object is really returned; moreover, the
5865 associated predicate handled_component_p will always return TRUE
5866 on these nodes, thus indicating that they are essentially handled
5867 by get_inner_reference. TRUE should only be passed when the caller
5868 is scanning the expression in order to build another representation
5869 and specifically knows how to handle these nodes; as such, this is
5870 the normal operating mode in the RTL expanders. */
5873 get_inner_reference (tree exp, HOST_WIDE_INT *pbitsize,
5874 HOST_WIDE_INT *pbitpos, tree *poffset,
5875 enum machine_mode *pmode, int *punsignedp,
5876 int *pvolatilep, bool keep_aligning)
5879 enum machine_mode mode = VOIDmode;
5880 tree offset = size_zero_node;
5881 tree bit_offset = bitsize_zero_node;
5883 /* First get the mode, signedness, and size. We do this from just the
5884 outermost expression. */
5885 if (TREE_CODE (exp) == COMPONENT_REF)
5887 size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
5888 if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1)))
5889 mode = DECL_MODE (TREE_OPERAND (exp, 1));
5891 *punsignedp = DECL_UNSIGNED (TREE_OPERAND (exp, 1));
5893 else if (TREE_CODE (exp) == BIT_FIELD_REF)
5895 size_tree = TREE_OPERAND (exp, 1);
5896 *punsignedp = (! INTEGRAL_TYPE_P (TREE_TYPE (exp))
5897 || TYPE_UNSIGNED (TREE_TYPE (exp)));
5899 /* For vector types, with the correct size of access, use the mode of
5901 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == VECTOR_TYPE
5902 && TREE_TYPE (exp) == TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))
5903 && tree_int_cst_equal (size_tree, TYPE_SIZE (TREE_TYPE (exp))))
5904 mode = TYPE_MODE (TREE_TYPE (exp));
5908 mode = TYPE_MODE (TREE_TYPE (exp));
5909 *punsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
5911 if (mode == BLKmode)
5912 size_tree = TYPE_SIZE (TREE_TYPE (exp));
5914 *pbitsize = GET_MODE_BITSIZE (mode);
5919 if (! host_integerp (size_tree, 1))
5920 mode = BLKmode, *pbitsize = -1;
5922 *pbitsize = tree_low_cst (size_tree, 1);
5927 /* Compute cumulative bit-offset for nested component-refs and array-refs,
5928 and find the ultimate containing object. */
5931 switch (TREE_CODE (exp))
5934 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5935 TREE_OPERAND (exp, 2));
5940 tree field = TREE_OPERAND (exp, 1);
5941 tree this_offset = component_ref_field_offset (exp);
5943 /* If this field hasn't been filled in yet, don't go past it.
5944 This should only happen when folding expressions made during
5945 type construction. */
5946 if (this_offset == 0)
5949 offset = size_binop (PLUS_EXPR, offset, this_offset);
5950 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5951 DECL_FIELD_BIT_OFFSET (field));
5953 /* ??? Right now we don't do anything with DECL_OFFSET_ALIGN. */
5958 case ARRAY_RANGE_REF:
5960 tree index = TREE_OPERAND (exp, 1);
5961 tree low_bound = array_ref_low_bound (exp);
5962 tree unit_size = array_ref_element_size (exp);
5964 /* We assume all arrays have sizes that are a multiple of a byte.
5965 First subtract the lower bound, if any, in the type of the
5966 index, then convert to sizetype and multiply by the size of
5967 the array element. */
5968 if (! integer_zerop (low_bound))
5969 index = fold_build2 (MINUS_EXPR, TREE_TYPE (index),
5972 offset = size_binop (PLUS_EXPR, offset,
5973 size_binop (MULT_EXPR,
5974 fold_convert (sizetype, index),
5983 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5984 bitsize_int (*pbitsize));
5987 case VIEW_CONVERT_EXPR:
5988 if (keep_aligning && STRICT_ALIGNMENT
5989 && (TYPE_ALIGN (TREE_TYPE (exp))
5990 > TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0))))
5991 && (TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0)))
5992 < BIGGEST_ALIGNMENT)
5993 && (TYPE_ALIGN_OK (TREE_TYPE (exp))
5994 || TYPE_ALIGN_OK (TREE_TYPE (TREE_OPERAND (exp, 0)))))
6002 /* If any reference in the chain is volatile, the effect is volatile. */
6003 if (TREE_THIS_VOLATILE (exp))
6006 exp = TREE_OPERAND (exp, 0);
6010 /* If OFFSET is constant, see if we can return the whole thing as a
6011 constant bit position. Make sure to handle overflow during
6013 if (host_integerp (offset, 0))
6015 double_int tem = double_int_mul (tree_to_double_int (offset),
6016 uhwi_to_double_int (BITS_PER_UNIT));
6017 tem = double_int_add (tem, tree_to_double_int (bit_offset));
6018 if (double_int_fits_in_shwi_p (tem))
6020 *pbitpos = double_int_to_shwi (tem);
6021 *poffset = NULL_TREE;
6026 /* Otherwise, split it up. */
6027 *pbitpos = tree_low_cst (bit_offset, 0);
6033 /* Given an expression EXP that may be a COMPONENT_REF or an ARRAY_REF,
6034 look for whether EXP or any nested component-refs within EXP is marked
6038 contains_packed_reference (const_tree exp)
6040 bool packed_p = false;
6044 switch (TREE_CODE (exp))
6048 tree field = TREE_OPERAND (exp, 1);
6049 packed_p = DECL_PACKED (field)
6050 || TYPE_PACKED (TREE_TYPE (field))
6051 || TYPE_PACKED (TREE_TYPE (exp));
6059 case ARRAY_RANGE_REF:
6062 case VIEW_CONVERT_EXPR:
6068 exp = TREE_OPERAND (exp, 0);
6074 /* Return a tree of sizetype representing the size, in bytes, of the element
6075 of EXP, an ARRAY_REF. */
6078 array_ref_element_size (tree exp)
6080 tree aligned_size = TREE_OPERAND (exp, 3);
6081 tree elmt_type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)));
6083 /* If a size was specified in the ARRAY_REF, it's the size measured
6084 in alignment units of the element type. So multiply by that value. */
6087 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6088 sizetype from another type of the same width and signedness. */
6089 if (TREE_TYPE (aligned_size) != sizetype)
6090 aligned_size = fold_convert (sizetype, aligned_size);
6091 return size_binop (MULT_EXPR, aligned_size,
6092 size_int (TYPE_ALIGN_UNIT (elmt_type)));
6095 /* Otherwise, take the size from that of the element type. Substitute
6096 any PLACEHOLDER_EXPR that we have. */
6098 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (elmt_type), exp);
6101 /* Return a tree representing the lower bound of the array mentioned in
6102 EXP, an ARRAY_REF. */
6105 array_ref_low_bound (tree exp)
6107 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
6109 /* If a lower bound is specified in EXP, use it. */
6110 if (TREE_OPERAND (exp, 2))
6111 return TREE_OPERAND (exp, 2);
6113 /* Otherwise, if there is a domain type and it has a lower bound, use it,
6114 substituting for a PLACEHOLDER_EXPR as needed. */
6115 if (domain_type && TYPE_MIN_VALUE (domain_type))
6116 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MIN_VALUE (domain_type), exp);
6118 /* Otherwise, return a zero of the appropriate type. */
6119 return build_int_cst (TREE_TYPE (TREE_OPERAND (exp, 1)), 0);
6122 /* Return a tree representing the upper bound of the array mentioned in
6123 EXP, an ARRAY_REF. */
6126 array_ref_up_bound (tree exp)
6128 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
6130 /* If there is a domain type and it has an upper bound, use it, substituting
6131 for a PLACEHOLDER_EXPR as needed. */
6132 if (domain_type && TYPE_MAX_VALUE (domain_type))
6133 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MAX_VALUE (domain_type), exp);
6135 /* Otherwise fail. */
6139 /* Return a tree representing the offset, in bytes, of the field referenced
6140 by EXP. This does not include any offset in DECL_FIELD_BIT_OFFSET. */
6143 component_ref_field_offset (tree exp)
6145 tree aligned_offset = TREE_OPERAND (exp, 2);
6146 tree field = TREE_OPERAND (exp, 1);
6148 /* If an offset was specified in the COMPONENT_REF, it's the offset measured
6149 in units of DECL_OFFSET_ALIGN / BITS_PER_UNIT. So multiply by that
6153 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
6154 sizetype from another type of the same width and signedness. */
6155 if (TREE_TYPE (aligned_offset) != sizetype)
6156 aligned_offset = fold_convert (sizetype, aligned_offset);
6157 return size_binop (MULT_EXPR, aligned_offset,
6158 size_int (DECL_OFFSET_ALIGN (field) / BITS_PER_UNIT));
6161 /* Otherwise, take the offset from that of the field. Substitute
6162 any PLACEHOLDER_EXPR that we have. */
6164 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_FIELD_OFFSET (field), exp);
6167 /* Return 1 if T is an expression that get_inner_reference handles. */
6170 handled_component_p (const_tree t)
6172 switch (TREE_CODE (t))
6177 case ARRAY_RANGE_REF:
6178 case VIEW_CONVERT_EXPR:
6188 /* Given an rtx VALUE that may contain additions and multiplications, return
6189 an equivalent value that just refers to a register, memory, or constant.
6190 This is done by generating instructions to perform the arithmetic and
6191 returning a pseudo-register containing the value.
6193 The returned value may be a REG, SUBREG, MEM or constant. */
6196 force_operand (rtx value, rtx target)
6199 /* Use subtarget as the target for operand 0 of a binary operation. */
6200 rtx subtarget = get_subtarget (target);
6201 enum rtx_code code = GET_CODE (value);
6203 /* Check for subreg applied to an expression produced by loop optimizer. */
6205 && !REG_P (SUBREG_REG (value))
6206 && !MEM_P (SUBREG_REG (value)))
6209 = simplify_gen_subreg (GET_MODE (value),
6210 force_reg (GET_MODE (SUBREG_REG (value)),
6211 force_operand (SUBREG_REG (value),
6213 GET_MODE (SUBREG_REG (value)),
6214 SUBREG_BYTE (value));
6215 code = GET_CODE (value);
6218 /* Check for a PIC address load. */
6219 if ((code == PLUS || code == MINUS)
6220 && XEXP (value, 0) == pic_offset_table_rtx
6221 && (GET_CODE (XEXP (value, 1)) == SYMBOL_REF
6222 || GET_CODE (XEXP (value, 1)) == LABEL_REF
6223 || GET_CODE (XEXP (value, 1)) == CONST))
6226 subtarget = gen_reg_rtx (GET_MODE (value));
6227 emit_move_insn (subtarget, value);
6231 if (ARITHMETIC_P (value))
6233 op2 = XEXP (value, 1);
6234 if (!CONSTANT_P (op2) && !(REG_P (op2) && op2 != subtarget))
6236 if (code == MINUS && GET_CODE (op2) == CONST_INT)
6239 op2 = negate_rtx (GET_MODE (value), op2);
6242 /* Check for an addition with OP2 a constant integer and our first
6243 operand a PLUS of a virtual register and something else. In that
6244 case, we want to emit the sum of the virtual register and the
6245 constant first and then add the other value. This allows virtual
6246 register instantiation to simply modify the constant rather than
6247 creating another one around this addition. */
6248 if (code == PLUS && GET_CODE (op2) == CONST_INT
6249 && GET_CODE (XEXP (value, 0)) == PLUS
6250 && REG_P (XEXP (XEXP (value, 0), 0))
6251 && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
6252 && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
6254 rtx temp = expand_simple_binop (GET_MODE (value), code,
6255 XEXP (XEXP (value, 0), 0), op2,
6256 subtarget, 0, OPTAB_LIB_WIDEN);
6257 return expand_simple_binop (GET_MODE (value), code, temp,
6258 force_operand (XEXP (XEXP (value,
6260 target, 0, OPTAB_LIB_WIDEN);
6263 op1 = force_operand (XEXP (value, 0), subtarget);
6264 op2 = force_operand (op2, NULL_RTX);
6268 return expand_mult (GET_MODE (value), op1, op2, target, 1);
6270 if (!INTEGRAL_MODE_P (GET_MODE (value)))
6271 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6272 target, 1, OPTAB_LIB_WIDEN);
6274 return expand_divmod (0,
6275 FLOAT_MODE_P (GET_MODE (value))
6276 ? RDIV_EXPR : TRUNC_DIV_EXPR,
6277 GET_MODE (value), op1, op2, target, 0);
6279 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
6282 return expand_divmod (0, TRUNC_DIV_EXPR, GET_MODE (value), op1, op2,
6285 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
6288 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6289 target, 0, OPTAB_LIB_WIDEN);
6291 return expand_simple_binop (GET_MODE (value), code, op1, op2,
6292 target, 1, OPTAB_LIB_WIDEN);
6295 if (UNARY_P (value))
6298 target = gen_reg_rtx (GET_MODE (value));
6299 op1 = force_operand (XEXP (value, 0), NULL_RTX);
6306 case FLOAT_TRUNCATE:
6307 convert_move (target, op1, code == ZERO_EXTEND);
6312 expand_fix (target, op1, code == UNSIGNED_FIX);
6316 case UNSIGNED_FLOAT:
6317 expand_float (target, op1, code == UNSIGNED_FLOAT);
6321 return expand_simple_unop (GET_MODE (value), code, op1, target, 0);
6325 #ifdef INSN_SCHEDULING
6326 /* On machines that have insn scheduling, we want all memory reference to be
6327 explicit, so we need to deal with such paradoxical SUBREGs. */
6328 if (GET_CODE (value) == SUBREG && MEM_P (SUBREG_REG (value))
6329 && (GET_MODE_SIZE (GET_MODE (value))
6330 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (value)))))
6332 = simplify_gen_subreg (GET_MODE (value),
6333 force_reg (GET_MODE (SUBREG_REG (value)),
6334 force_operand (SUBREG_REG (value),
6336 GET_MODE (SUBREG_REG (value)),
6337 SUBREG_BYTE (value));
6343 /* Subroutine of expand_expr: return nonzero iff there is no way that
6344 EXP can reference X, which is being modified. TOP_P is nonzero if this
6345 call is going to be used to determine whether we need a temporary
6346 for EXP, as opposed to a recursive call to this function.
6348 It is always safe for this routine to return zero since it merely
6349 searches for optimization opportunities. */
6352 safe_from_p (const_rtx x, tree exp, int top_p)
6358 /* If EXP has varying size, we MUST use a target since we currently
6359 have no way of allocating temporaries of variable size
6360 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
6361 So we assume here that something at a higher level has prevented a
6362 clash. This is somewhat bogus, but the best we can do. Only
6363 do this when X is BLKmode and when we are at the top level. */
6364 || (top_p && TREE_TYPE (exp) != 0 && COMPLETE_TYPE_P (TREE_TYPE (exp))
6365 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
6366 && (TREE_CODE (TREE_TYPE (exp)) != ARRAY_TYPE
6367 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)) == NULL_TREE
6368 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)))
6370 && GET_MODE (x) == BLKmode)
6371 /* If X is in the outgoing argument area, it is always safe. */
6373 && (XEXP (x, 0) == virtual_outgoing_args_rtx
6374 || (GET_CODE (XEXP (x, 0)) == PLUS
6375 && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx))))
6378 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
6379 find the underlying pseudo. */
6380 if (GET_CODE (x) == SUBREG)
6383 if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6387 /* Now look at our tree code and possibly recurse. */
6388 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
6390 case tcc_declaration:
6391 exp_rtl = DECL_RTL_IF_SET (exp);
6397 case tcc_exceptional:
6398 if (TREE_CODE (exp) == TREE_LIST)
6402 if (TREE_VALUE (exp) && !safe_from_p (x, TREE_VALUE (exp), 0))
6404 exp = TREE_CHAIN (exp);
6407 if (TREE_CODE (exp) != TREE_LIST)
6408 return safe_from_p (x, exp, 0);
6411 else if (TREE_CODE (exp) == CONSTRUCTOR)
6413 constructor_elt *ce;
6414 unsigned HOST_WIDE_INT idx;
6417 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
6419 if ((ce->index != NULL_TREE && !safe_from_p (x, ce->index, 0))
6420 || !safe_from_p (x, ce->value, 0))
6424 else if (TREE_CODE (exp) == ERROR_MARK)
6425 return 1; /* An already-visited SAVE_EXPR? */
6430 /* The only case we look at here is the DECL_INITIAL inside a
6432 return (TREE_CODE (exp) != DECL_EXPR
6433 || TREE_CODE (DECL_EXPR_DECL (exp)) != VAR_DECL
6434 || !DECL_INITIAL (DECL_EXPR_DECL (exp))
6435 || safe_from_p (x, DECL_INITIAL (DECL_EXPR_DECL (exp)), 0));
6438 case tcc_comparison:
6439 if (!safe_from_p (x, TREE_OPERAND (exp, 1), 0))
6444 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6446 case tcc_expression:
6449 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
6450 the expression. If it is set, we conflict iff we are that rtx or
6451 both are in memory. Otherwise, we check all operands of the
6452 expression recursively. */
6454 switch (TREE_CODE (exp))
6457 /* If the operand is static or we are static, we can't conflict.
6458 Likewise if we don't conflict with the operand at all. */
6459 if (staticp (TREE_OPERAND (exp, 0))
6460 || TREE_STATIC (exp)
6461 || safe_from_p (x, TREE_OPERAND (exp, 0), 0))
6464 /* Otherwise, the only way this can conflict is if we are taking
6465 the address of a DECL a that address if part of X, which is
6467 exp = TREE_OPERAND (exp, 0);
6470 if (!DECL_RTL_SET_P (exp)
6471 || !MEM_P (DECL_RTL (exp)))
6474 exp_rtl = XEXP (DECL_RTL (exp), 0);
6478 case MISALIGNED_INDIRECT_REF:
6479 case ALIGN_INDIRECT_REF:
6482 && alias_sets_conflict_p (MEM_ALIAS_SET (x),
6483 get_alias_set (exp)))
6488 /* Assume that the call will clobber all hard registers and
6490 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6495 case WITH_CLEANUP_EXPR:
6496 case CLEANUP_POINT_EXPR:
6497 /* Lowered by gimplify.c. */
6501 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6507 /* If we have an rtx, we do not need to scan our operands. */
6511 nops = TREE_OPERAND_LENGTH (exp);
6512 for (i = 0; i < nops; i++)
6513 if (TREE_OPERAND (exp, i) != 0
6514 && ! safe_from_p (x, TREE_OPERAND (exp, i), 0))
6520 /* Should never get a type here. */
6523 case tcc_gimple_stmt:
6527 /* If we have an rtl, find any enclosed object. Then see if we conflict
6531 if (GET_CODE (exp_rtl) == SUBREG)
6533 exp_rtl = SUBREG_REG (exp_rtl);
6535 && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
6539 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
6540 are memory and they conflict. */
6541 return ! (rtx_equal_p (x, exp_rtl)
6542 || (MEM_P (x) && MEM_P (exp_rtl)
6543 && true_dependence (exp_rtl, VOIDmode, x,
6544 rtx_addr_varies_p)));
6547 /* If we reach here, it is safe. */
6552 /* Return the highest power of two that EXP is known to be a multiple of.
6553 This is used in updating alignment of MEMs in array references. */
6555 unsigned HOST_WIDE_INT
6556 highest_pow2_factor (const_tree exp)
6558 unsigned HOST_WIDE_INT c0, c1;
6560 switch (TREE_CODE (exp))
6563 /* We can find the lowest bit that's a one. If the low
6564 HOST_BITS_PER_WIDE_INT bits are zero, return BIGGEST_ALIGNMENT.
6565 We need to handle this case since we can find it in a COND_EXPR,
6566 a MIN_EXPR, or a MAX_EXPR. If the constant overflows, we have an
6567 erroneous program, so return BIGGEST_ALIGNMENT to avoid any
6569 if (TREE_OVERFLOW (exp))
6570 return BIGGEST_ALIGNMENT;
6573 /* Note: tree_low_cst is intentionally not used here,
6574 we don't care about the upper bits. */
6575 c0 = TREE_INT_CST_LOW (exp);
6577 return c0 ? c0 : BIGGEST_ALIGNMENT;
6581 case PLUS_EXPR: case MINUS_EXPR: case MIN_EXPR: case MAX_EXPR:
6582 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6583 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6584 return MIN (c0, c1);
6587 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6588 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6591 case ROUND_DIV_EXPR: case TRUNC_DIV_EXPR: case FLOOR_DIV_EXPR:
6593 if (integer_pow2p (TREE_OPERAND (exp, 1))
6594 && host_integerp (TREE_OPERAND (exp, 1), 1))
6596 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6597 c1 = tree_low_cst (TREE_OPERAND (exp, 1), 1);
6598 return MAX (1, c0 / c1);
6602 case NON_LVALUE_EXPR: case NOP_EXPR: case CONVERT_EXPR:
6604 return highest_pow2_factor (TREE_OPERAND (exp, 0));
6607 return highest_pow2_factor (TREE_OPERAND (exp, 1));
6610 c0 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6611 c1 = highest_pow2_factor (TREE_OPERAND (exp, 2));
6612 return MIN (c0, c1);
6621 /* Similar, except that the alignment requirements of TARGET are
6622 taken into account. Assume it is at least as aligned as its
6623 type, unless it is a COMPONENT_REF in which case the layout of
6624 the structure gives the alignment. */
6626 static unsigned HOST_WIDE_INT
6627 highest_pow2_factor_for_target (const_tree target, const_tree exp)
6629 unsigned HOST_WIDE_INT target_align, factor;
6631 factor = highest_pow2_factor (exp);
6632 if (TREE_CODE (target) == COMPONENT_REF)
6633 target_align = DECL_ALIGN_UNIT (TREE_OPERAND (target, 1));
6635 target_align = TYPE_ALIGN_UNIT (TREE_TYPE (target));
6636 return MAX (factor, target_align);
6639 /* Return &VAR expression for emulated thread local VAR. */
6642 emutls_var_address (tree var)
6644 tree emuvar = emutls_decl (var);
6645 tree fn = built_in_decls [BUILT_IN_EMUTLS_GET_ADDRESS];
6646 tree arg = build_fold_addr_expr_with_type (emuvar, ptr_type_node);
6647 tree arglist = build_tree_list (NULL_TREE, arg);
6648 tree call = build_function_call_expr (fn, arglist);
6649 return fold_convert (build_pointer_type (TREE_TYPE (var)), call);
6652 /* Expands variable VAR. */
6655 expand_var (tree var)
6657 if (DECL_EXTERNAL (var))
6660 if (TREE_STATIC (var))
6661 /* If this is an inlined copy of a static local variable,
6662 look up the original decl. */
6663 var = DECL_ORIGIN (var);
6665 if (TREE_STATIC (var)
6666 ? !TREE_ASM_WRITTEN (var)
6667 : !DECL_RTL_SET_P (var))
6669 if (TREE_CODE (var) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (var))
6670 /* Should be ignored. */;
6671 else if (lang_hooks.expand_decl (var))
6673 else if (TREE_CODE (var) == VAR_DECL && !TREE_STATIC (var))
6675 else if (TREE_CODE (var) == VAR_DECL && TREE_STATIC (var))
6676 rest_of_decl_compilation (var, 0, 0);
6678 /* No expansion needed. */
6679 gcc_assert (TREE_CODE (var) == TYPE_DECL
6680 || TREE_CODE (var) == CONST_DECL
6681 || TREE_CODE (var) == FUNCTION_DECL
6682 || TREE_CODE (var) == LABEL_DECL);
6686 /* Subroutine of expand_expr. Expand the two operands of a binary
6687 expression EXP0 and EXP1 placing the results in OP0 and OP1.
6688 The value may be stored in TARGET if TARGET is nonzero. The
6689 MODIFIER argument is as documented by expand_expr. */
6692 expand_operands (tree exp0, tree exp1, rtx target, rtx *op0, rtx *op1,
6693 enum expand_modifier modifier)
6695 if (! safe_from_p (target, exp1, 1))
6697 if (operand_equal_p (exp0, exp1, 0))
6699 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6700 *op1 = copy_rtx (*op0);
6704 /* If we need to preserve evaluation order, copy exp0 into its own
6705 temporary variable so that it can't be clobbered by exp1. */
6706 if (flag_evaluation_order && TREE_SIDE_EFFECTS (exp1))
6707 exp0 = save_expr (exp0);
6708 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6709 *op1 = expand_expr (exp1, NULL_RTX, VOIDmode, modifier);
6714 /* Return a MEM that contains constant EXP. DEFER is as for
6715 output_constant_def and MODIFIER is as for expand_expr. */
6718 expand_expr_constant (tree exp, int defer, enum expand_modifier modifier)
6722 mem = output_constant_def (exp, defer);
6723 if (modifier != EXPAND_INITIALIZER)
6724 mem = use_anchored_address (mem);
6728 /* A subroutine of expand_expr_addr_expr. Evaluate the address of EXP.
6729 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6732 expand_expr_addr_expr_1 (tree exp, rtx target, enum machine_mode tmode,
6733 enum expand_modifier modifier)
6735 rtx result, subtarget;
6737 HOST_WIDE_INT bitsize, bitpos;
6738 int volatilep, unsignedp;
6739 enum machine_mode mode1;
6741 /* If we are taking the address of a constant and are at the top level,
6742 we have to use output_constant_def since we can't call force_const_mem
6744 /* ??? This should be considered a front-end bug. We should not be
6745 generating ADDR_EXPR of something that isn't an LVALUE. The only
6746 exception here is STRING_CST. */
6747 if (CONSTANT_CLASS_P (exp))
6748 return XEXP (expand_expr_constant (exp, 0, modifier), 0);
6750 /* Everything must be something allowed by is_gimple_addressable. */
6751 switch (TREE_CODE (exp))
6754 /* This case will happen via recursion for &a->b. */
6755 return expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
6758 /* Recurse and make the output_constant_def clause above handle this. */
6759 return expand_expr_addr_expr_1 (DECL_INITIAL (exp), target,
6763 /* The real part of the complex number is always first, therefore
6764 the address is the same as the address of the parent object. */
6767 inner = TREE_OPERAND (exp, 0);
6771 /* The imaginary part of the complex number is always second.
6772 The expression is therefore always offset by the size of the
6775 bitpos = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (exp)));
6776 inner = TREE_OPERAND (exp, 0);
6780 /* TLS emulation hook - replace __thread VAR's &VAR with
6781 __emutls_get_address (&_emutls.VAR). */
6782 if (! targetm.have_tls
6783 && TREE_CODE (exp) == VAR_DECL
6784 && DECL_THREAD_LOCAL_P (exp))
6786 exp = emutls_var_address (exp);
6787 return expand_expr (exp, target, tmode, modifier);
6792 /* If the object is a DECL, then expand it for its rtl. Don't bypass
6793 expand_expr, as that can have various side effects; LABEL_DECLs for
6794 example, may not have their DECL_RTL set yet. Expand the rtl of
6795 CONSTRUCTORs too, which should yield a memory reference for the
6796 constructor's contents. Assume language specific tree nodes can
6797 be expanded in some interesting way. */
6799 || TREE_CODE (exp) == CONSTRUCTOR
6800 || TREE_CODE (exp) >= LAST_AND_UNUSED_TREE_CODE)
6802 result = expand_expr (exp, target, tmode,
6803 modifier == EXPAND_INITIALIZER
6804 ? EXPAND_INITIALIZER : EXPAND_CONST_ADDRESS);
6806 /* If the DECL isn't in memory, then the DECL wasn't properly
6807 marked TREE_ADDRESSABLE, which will be either a front-end
6808 or a tree optimizer bug. */
6809 gcc_assert (MEM_P (result));
6810 result = XEXP (result, 0);
6812 /* ??? Is this needed anymore? */
6813 if (DECL_P (exp) && !TREE_USED (exp) == 0)
6815 assemble_external (exp);
6816 TREE_USED (exp) = 1;
6819 if (modifier != EXPAND_INITIALIZER
6820 && modifier != EXPAND_CONST_ADDRESS)
6821 result = force_operand (result, target);
6825 /* Pass FALSE as the last argument to get_inner_reference although
6826 we are expanding to RTL. The rationale is that we know how to
6827 handle "aligning nodes" here: we can just bypass them because
6828 they won't change the final object whose address will be returned
6829 (they actually exist only for that purpose). */
6830 inner = get_inner_reference (exp, &bitsize, &bitpos, &offset,
6831 &mode1, &unsignedp, &volatilep, false);
6835 /* We must have made progress. */
6836 gcc_assert (inner != exp);
6838 subtarget = offset || bitpos ? NULL_RTX : target;
6839 result = expand_expr_addr_expr_1 (inner, subtarget, tmode, modifier);
6845 if (modifier != EXPAND_NORMAL)
6846 result = force_operand (result, NULL);
6847 tmp = expand_expr (offset, NULL_RTX, tmode,
6848 modifier == EXPAND_INITIALIZER
6849 ? EXPAND_INITIALIZER : EXPAND_NORMAL);
6851 result = convert_memory_address (tmode, result);
6852 tmp = convert_memory_address (tmode, tmp);
6854 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
6855 result = gen_rtx_PLUS (tmode, result, tmp);
6858 subtarget = bitpos ? NULL_RTX : target;
6859 result = expand_simple_binop (tmode, PLUS, result, tmp, subtarget,
6860 1, OPTAB_LIB_WIDEN);
6866 /* Someone beforehand should have rejected taking the address
6867 of such an object. */
6868 gcc_assert ((bitpos % BITS_PER_UNIT) == 0);
6870 result = plus_constant (result, bitpos / BITS_PER_UNIT);
6871 if (modifier < EXPAND_SUM)
6872 result = force_operand (result, target);
6878 /* A subroutine of expand_expr. Evaluate EXP, which is an ADDR_EXPR.
6879 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6882 expand_expr_addr_expr (tree exp, rtx target, enum machine_mode tmode,
6883 enum expand_modifier modifier)
6885 enum machine_mode rmode;
6888 /* Target mode of VOIDmode says "whatever's natural". */
6889 if (tmode == VOIDmode)
6890 tmode = TYPE_MODE (TREE_TYPE (exp));
6892 /* We can get called with some Weird Things if the user does silliness
6893 like "(short) &a". In that case, convert_memory_address won't do
6894 the right thing, so ignore the given target mode. */
6895 if (tmode != Pmode && tmode != ptr_mode)
6898 result = expand_expr_addr_expr_1 (TREE_OPERAND (exp, 0), target,
6901 /* Despite expand_expr claims concerning ignoring TMODE when not
6902 strictly convenient, stuff breaks if we don't honor it. Note
6903 that combined with the above, we only do this for pointer modes. */
6904 rmode = GET_MODE (result);
6905 if (rmode == VOIDmode)
6908 result = convert_memory_address (tmode, result);
6913 /* Generate code for computing CONSTRUCTOR EXP.
6914 An rtx for the computed value is returned. If AVOID_TEMP_MEM
6915 is TRUE, instead of creating a temporary variable in memory
6916 NULL is returned and the caller needs to handle it differently. */
6919 expand_constructor (tree exp, rtx target, enum expand_modifier modifier,
6920 bool avoid_temp_mem)
6922 tree type = TREE_TYPE (exp);
6923 enum machine_mode mode = TYPE_MODE (type);
6925 /* Try to avoid creating a temporary at all. This is possible
6926 if all of the initializer is zero.
6927 FIXME: try to handle all [0..255] initializers we can handle
6929 if (TREE_STATIC (exp)
6930 && !TREE_ADDRESSABLE (exp)
6931 && target != 0 && mode == BLKmode
6932 && all_zeros_p (exp))
6934 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
6938 /* All elts simple constants => refer to a constant in memory. But
6939 if this is a non-BLKmode mode, let it store a field at a time
6940 since that should make a CONST_INT or CONST_DOUBLE when we
6941 fold. Likewise, if we have a target we can use, it is best to
6942 store directly into the target unless the type is large enough
6943 that memcpy will be used. If we are making an initializer and
6944 all operands are constant, put it in memory as well.
6946 FIXME: Avoid trying to fill vector constructors piece-meal.
6947 Output them with output_constant_def below unless we're sure
6948 they're zeros. This should go away when vector initializers
6949 are treated like VECTOR_CST instead of arrays. */
6950 if ((TREE_STATIC (exp)
6951 && ((mode == BLKmode
6952 && ! (target != 0 && safe_from_p (target, exp, 1)))
6953 || TREE_ADDRESSABLE (exp)
6954 || (host_integerp (TYPE_SIZE_UNIT (type), 1)
6955 && (! MOVE_BY_PIECES_P
6956 (tree_low_cst (TYPE_SIZE_UNIT (type), 1),
6958 && ! mostly_zeros_p (exp))))
6959 || ((modifier == EXPAND_INITIALIZER || modifier == EXPAND_CONST_ADDRESS)
6960 && TREE_CONSTANT (exp)))
6967 constructor = expand_expr_constant (exp, 1, modifier);
6969 if (modifier != EXPAND_CONST_ADDRESS
6970 && modifier != EXPAND_INITIALIZER
6971 && modifier != EXPAND_SUM)
6972 constructor = validize_mem (constructor);
6977 /* Handle calls that pass values in multiple non-contiguous
6978 locations. The Irix 6 ABI has examples of this. */
6979 if (target == 0 || ! safe_from_p (target, exp, 1)
6980 || GET_CODE (target) == PARALLEL || modifier == EXPAND_STACK_PARM)
6986 = assign_temp (build_qualified_type (type, (TYPE_QUALS (type)
6987 | (TREE_READONLY (exp)
6988 * TYPE_QUAL_CONST))),
6989 0, TREE_ADDRESSABLE (exp), 1);
6992 store_constructor (exp, target, 0, int_expr_size (exp));
6997 /* expand_expr: generate code for computing expression EXP.
6998 An rtx for the computed value is returned. The value is never null.
6999 In the case of a void EXP, const0_rtx is returned.
7001 The value may be stored in TARGET if TARGET is nonzero.
7002 TARGET is just a suggestion; callers must assume that
7003 the rtx returned may not be the same as TARGET.
7005 If TARGET is CONST0_RTX, it means that the value will be ignored.
7007 If TMODE is not VOIDmode, it suggests generating the
7008 result in mode TMODE. But this is done only when convenient.
7009 Otherwise, TMODE is ignored and the value generated in its natural mode.
7010 TMODE is just a suggestion; callers must assume that
7011 the rtx returned may not have mode TMODE.
7013 Note that TARGET may have neither TMODE nor MODE. In that case, it
7014 probably will not be used.
7016 If MODIFIER is EXPAND_SUM then when EXP is an addition
7017 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
7018 or a nest of (PLUS ...) and (MINUS ...) where the terms are
7019 products as above, or REG or MEM, or constant.
7020 Ordinarily in such cases we would output mul or add instructions
7021 and then return a pseudo reg containing the sum.
7023 EXPAND_INITIALIZER is much like EXPAND_SUM except that
7024 it also marks a label as absolutely required (it can't be dead).
7025 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
7026 This is used for outputting expressions used in initializers.
7028 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
7029 with a constant address even if that address is not normally legitimate.
7030 EXPAND_INITIALIZER and EXPAND_SUM also have this effect.
7032 EXPAND_STACK_PARM is used when expanding to a TARGET on the stack for
7033 a call parameter. Such targets require special care as we haven't yet
7034 marked TARGET so that it's safe from being trashed by libcalls. We
7035 don't want to use TARGET for anything but the final result;
7036 Intermediate values must go elsewhere. Additionally, calls to
7037 emit_block_move will be flagged with BLOCK_OP_CALL_PARM.
7039 If EXP is a VAR_DECL whose DECL_RTL was a MEM with an invalid
7040 address, and ALT_RTL is non-NULL, then *ALT_RTL is set to the
7041 DECL_RTL of the VAR_DECL. *ALT_RTL is also set if EXP is a
7042 COMPOUND_EXPR whose second argument is such a VAR_DECL, and so on
7045 static rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
7046 enum expand_modifier, rtx *);
7049 expand_expr_real (tree exp, rtx target, enum machine_mode tmode,
7050 enum expand_modifier modifier, rtx *alt_rtl)
7053 rtx ret, last = NULL;
7055 /* Handle ERROR_MARK before anybody tries to access its type. */
7056 if (TREE_CODE (exp) == ERROR_MARK
7057 || TREE_CODE (exp) == PREDICT_EXPR
7058 || (!GIMPLE_TUPLE_P (exp) && TREE_CODE (TREE_TYPE (exp)) == ERROR_MARK))
7060 ret = CONST0_RTX (tmode);
7061 return ret ? ret : const0_rtx;
7064 if (flag_non_call_exceptions)
7066 rn = lookup_stmt_eh_region (exp);
7067 /* If rn < 0, then either (1) tree-ssa not used or (2) doesn't throw. */
7069 last = get_last_insn ();
7072 /* If this is an expression of some kind and it has an associated line
7073 number, then emit the line number before expanding the expression.
7075 We need to save and restore the file and line information so that
7076 errors discovered during expansion are emitted with the right
7077 information. It would be better of the diagnostic routines
7078 used the file/line information embedded in the tree nodes rather
7080 if (cfun && EXPR_HAS_LOCATION (exp))
7082 location_t saved_location = input_location;
7083 input_location = EXPR_LOCATION (exp);
7084 set_curr_insn_source_location (input_location);
7086 /* Record where the insns produced belong. */
7087 set_curr_insn_block (TREE_BLOCK (exp));
7089 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
7091 input_location = saved_location;
7095 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
7098 /* If using non-call exceptions, mark all insns that may trap.
7099 expand_call() will mark CALL_INSNs before we get to this code,
7100 but it doesn't handle libcalls, and these may trap. */
7104 for (insn = next_real_insn (last); insn;
7105 insn = next_real_insn (insn))
7107 if (! find_reg_note (insn, REG_EH_REGION, NULL_RTX)
7108 /* If we want exceptions for non-call insns, any
7109 may_trap_p instruction may throw. */
7110 && GET_CODE (PATTERN (insn)) != CLOBBER
7111 && GET_CODE (PATTERN (insn)) != USE
7112 && (CALL_P (insn) || may_trap_p (PATTERN (insn))))
7114 REG_NOTES (insn) = alloc_EXPR_LIST (REG_EH_REGION, GEN_INT (rn),
7124 expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
7125 enum expand_modifier modifier, rtx *alt_rtl)
7127 rtx op0, op1, op2, temp, decl_rtl;
7130 enum machine_mode mode;
7131 enum tree_code code = TREE_CODE (exp);
7133 rtx subtarget, original_target;
7135 tree context, subexp0, subexp1;
7136 bool reduce_bit_field;
7137 #define REDUCE_BIT_FIELD(expr) (reduce_bit_field \
7138 ? reduce_to_bit_field_precision ((expr), \
7143 if (GIMPLE_STMT_P (exp))
7145 type = void_type_node;
7151 type = TREE_TYPE (exp);
7152 mode = TYPE_MODE (type);
7153 unsignedp = TYPE_UNSIGNED (type);
7156 ignore = (target == const0_rtx
7157 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
7158 || code == CONVERT_EXPR || code == COND_EXPR
7159 || code == VIEW_CONVERT_EXPR)
7160 && TREE_CODE (type) == VOID_TYPE));
7162 /* An operation in what may be a bit-field type needs the
7163 result to be reduced to the precision of the bit-field type,
7164 which is narrower than that of the type's mode. */
7165 reduce_bit_field = (!ignore
7166 && TREE_CODE (type) == INTEGER_TYPE
7167 && GET_MODE_PRECISION (mode) > TYPE_PRECISION (type));
7169 /* If we are going to ignore this result, we need only do something
7170 if there is a side-effect somewhere in the expression. If there
7171 is, short-circuit the most common cases here. Note that we must
7172 not call expand_expr with anything but const0_rtx in case this
7173 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
7177 if (! TREE_SIDE_EFFECTS (exp))
7180 /* Ensure we reference a volatile object even if value is ignored, but
7181 don't do this if all we are doing is taking its address. */
7182 if (TREE_THIS_VOLATILE (exp)
7183 && TREE_CODE (exp) != FUNCTION_DECL
7184 && mode != VOIDmode && mode != BLKmode
7185 && modifier != EXPAND_CONST_ADDRESS)
7187 temp = expand_expr (exp, NULL_RTX, VOIDmode, modifier);
7189 temp = copy_to_reg (temp);
7193 if (TREE_CODE_CLASS (code) == tcc_unary
7194 || code == COMPONENT_REF || code == INDIRECT_REF)
7195 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
7198 else if (TREE_CODE_CLASS (code) == tcc_binary
7199 || TREE_CODE_CLASS (code) == tcc_comparison
7200 || code == ARRAY_REF || code == ARRAY_RANGE_REF)
7202 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier);
7203 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, modifier);
7206 else if (code == BIT_FIELD_REF)
7208 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier);
7209 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, modifier);
7210 expand_expr (TREE_OPERAND (exp, 2), const0_rtx, VOIDmode, modifier);
7217 if (reduce_bit_field && modifier == EXPAND_STACK_PARM)
7220 /* Use subtarget as the target for operand 0 of a binary operation. */
7221 subtarget = get_subtarget (target);
7222 original_target = target;
7228 tree function = decl_function_context (exp);
7230 temp = label_rtx (exp);
7231 temp = gen_rtx_LABEL_REF (Pmode, temp);
7233 if (function != current_function_decl
7235 LABEL_REF_NONLOCAL_P (temp) = 1;
7237 temp = gen_rtx_MEM (FUNCTION_MODE, temp);
7242 return expand_expr_real_1 (SSA_NAME_VAR (exp), target, tmode, modifier,
7247 /* If a static var's type was incomplete when the decl was written,
7248 but the type is complete now, lay out the decl now. */
7249 if (DECL_SIZE (exp) == 0
7250 && COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (TREE_TYPE (exp))
7251 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
7252 layout_decl (exp, 0);
7254 /* TLS emulation hook - replace __thread vars with
7255 *__emutls_get_address (&_emutls.var). */
7256 if (! targetm.have_tls
7257 && TREE_CODE (exp) == VAR_DECL
7258 && DECL_THREAD_LOCAL_P (exp))
7260 exp = build_fold_indirect_ref (emutls_var_address (exp));
7261 return expand_expr_real_1 (exp, target, tmode, modifier, NULL);
7264 /* ... fall through ... */
7268 decl_rtl = DECL_RTL (exp);
7269 gcc_assert (decl_rtl);
7270 decl_rtl = copy_rtx (decl_rtl);
7272 /* Ensure variable marked as used even if it doesn't go through
7273 a parser. If it hasn't be used yet, write out an external
7275 if (! TREE_USED (exp))
7277 assemble_external (exp);
7278 TREE_USED (exp) = 1;
7281 /* Show we haven't gotten RTL for this yet. */
7284 /* Variables inherited from containing functions should have
7285 been lowered by this point. */
7286 context = decl_function_context (exp);
7287 gcc_assert (!context
7288 || context == current_function_decl
7289 || TREE_STATIC (exp)
7290 /* ??? C++ creates functions that are not TREE_STATIC. */
7291 || TREE_CODE (exp) == FUNCTION_DECL);
7293 /* This is the case of an array whose size is to be determined
7294 from its initializer, while the initializer is still being parsed.
7297 if (MEM_P (decl_rtl) && REG_P (XEXP (decl_rtl, 0)))
7298 temp = validize_mem (decl_rtl);
7300 /* If DECL_RTL is memory, we are in the normal case and the
7301 address is not valid, get the address into a register. */
7303 else if (MEM_P (decl_rtl) && modifier != EXPAND_INITIALIZER)
7306 *alt_rtl = decl_rtl;
7307 decl_rtl = use_anchored_address (decl_rtl);
7308 if (modifier != EXPAND_CONST_ADDRESS
7309 && modifier != EXPAND_SUM
7310 && !memory_address_p (DECL_MODE (exp), XEXP (decl_rtl, 0)))
7311 temp = replace_equiv_address (decl_rtl,
7312 copy_rtx (XEXP (decl_rtl, 0)));
7315 /* If we got something, return it. But first, set the alignment
7316 if the address is a register. */
7319 if (MEM_P (temp) && REG_P (XEXP (temp, 0)))
7320 mark_reg_pointer (XEXP (temp, 0), DECL_ALIGN (exp));
7325 /* If the mode of DECL_RTL does not match that of the decl, it
7326 must be a promoted value. We return a SUBREG of the wanted mode,
7327 but mark it so that we know that it was already extended. */
7329 if (REG_P (decl_rtl)
7330 && GET_MODE (decl_rtl) != DECL_MODE (exp))
7332 enum machine_mode pmode;
7334 /* Get the signedness used for this variable. Ensure we get the
7335 same mode we got when the variable was declared. */
7336 pmode = promote_mode (type, DECL_MODE (exp), &unsignedp,
7337 (TREE_CODE (exp) == RESULT_DECL
7338 || TREE_CODE (exp) == PARM_DECL) ? 1 : 0);
7339 gcc_assert (GET_MODE (decl_rtl) == pmode);
7341 temp = gen_lowpart_SUBREG (mode, decl_rtl);
7342 SUBREG_PROMOTED_VAR_P (temp) = 1;
7343 SUBREG_PROMOTED_UNSIGNED_SET (temp, unsignedp);
7350 temp = immed_double_const (TREE_INT_CST_LOW (exp),
7351 TREE_INT_CST_HIGH (exp), mode);
7357 tree tmp = NULL_TREE;
7358 if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT
7359 || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT
7360 || GET_MODE_CLASS (mode) == MODE_VECTOR_FRACT
7361 || GET_MODE_CLASS (mode) == MODE_VECTOR_UFRACT
7362 || GET_MODE_CLASS (mode) == MODE_VECTOR_ACCUM
7363 || GET_MODE_CLASS (mode) == MODE_VECTOR_UACCUM)
7364 return const_vector_from_tree (exp);
7365 if (GET_MODE_CLASS (mode) == MODE_INT)
7367 tree type_for_mode = lang_hooks.types.type_for_mode (mode, 1);
7369 tmp = fold_unary (VIEW_CONVERT_EXPR, type_for_mode, exp);
7372 tmp = build_constructor_from_list (type,
7373 TREE_VECTOR_CST_ELTS (exp));
7374 return expand_expr (tmp, ignore ? const0_rtx : target,
7379 return expand_expr (DECL_INITIAL (exp), target, VOIDmode, modifier);
7382 /* If optimized, generate immediate CONST_DOUBLE
7383 which will be turned into memory by reload if necessary.
7385 We used to force a register so that loop.c could see it. But
7386 this does not allow gen_* patterns to perform optimizations with
7387 the constants. It also produces two insns in cases like "x = 1.0;".
7388 On most machines, floating-point constants are not permitted in
7389 many insns, so we'd end up copying it to a register in any case.
7391 Now, we do the copying in expand_binop, if appropriate. */
7392 return CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (exp),
7393 TYPE_MODE (TREE_TYPE (exp)));
7396 return CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (exp),
7397 TYPE_MODE (TREE_TYPE (exp)));
7400 /* Handle evaluating a complex constant in a CONCAT target. */
7401 if (original_target && GET_CODE (original_target) == CONCAT)
7403 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
7406 rtarg = XEXP (original_target, 0);
7407 itarg = XEXP (original_target, 1);
7409 /* Move the real and imaginary parts separately. */
7410 op0 = expand_expr (TREE_REALPART (exp), rtarg, mode, EXPAND_NORMAL);
7411 op1 = expand_expr (TREE_IMAGPART (exp), itarg, mode, EXPAND_NORMAL);
7414 emit_move_insn (rtarg, op0);
7416 emit_move_insn (itarg, op1);
7418 return original_target;
7421 /* ... fall through ... */
7424 temp = expand_expr_constant (exp, 1, modifier);
7426 /* temp contains a constant address.
7427 On RISC machines where a constant address isn't valid,
7428 make some insns to get that address into a register. */
7429 if (modifier != EXPAND_CONST_ADDRESS
7430 && modifier != EXPAND_INITIALIZER
7431 && modifier != EXPAND_SUM
7432 && ! memory_address_p (mode, XEXP (temp, 0)))
7433 return replace_equiv_address (temp,
7434 copy_rtx (XEXP (temp, 0)));
7439 tree val = TREE_OPERAND (exp, 0);
7440 rtx ret = expand_expr_real_1 (val, target, tmode, modifier, alt_rtl);
7442 if (!SAVE_EXPR_RESOLVED_P (exp))
7444 /* We can indeed still hit this case, typically via builtin
7445 expanders calling save_expr immediately before expanding
7446 something. Assume this means that we only have to deal
7447 with non-BLKmode values. */
7448 gcc_assert (GET_MODE (ret) != BLKmode);
7450 val = build_decl (VAR_DECL, NULL, TREE_TYPE (exp));
7451 DECL_ARTIFICIAL (val) = 1;
7452 DECL_IGNORED_P (val) = 1;
7453 TREE_OPERAND (exp, 0) = val;
7454 SAVE_EXPR_RESOLVED_P (exp) = 1;
7456 if (!CONSTANT_P (ret))
7457 ret = copy_to_reg (ret);
7458 SET_DECL_RTL (val, ret);
7465 if (TREE_CODE (TREE_OPERAND (exp, 0)) == LABEL_DECL)
7466 expand_goto (TREE_OPERAND (exp, 0));
7468 expand_computed_goto (TREE_OPERAND (exp, 0));
7472 /* If we don't need the result, just ensure we evaluate any
7476 unsigned HOST_WIDE_INT idx;
7479 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
7480 expand_expr (value, const0_rtx, VOIDmode, EXPAND_NORMAL);
7485 return expand_constructor (exp, target, modifier, false);
7487 case MISALIGNED_INDIRECT_REF:
7488 case ALIGN_INDIRECT_REF:
7491 tree exp1 = TREE_OPERAND (exp, 0);
7493 if (modifier != EXPAND_WRITE)
7497 t = fold_read_from_constant_string (exp);
7499 return expand_expr (t, target, tmode, modifier);
7502 op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
7503 op0 = memory_address (mode, op0);
7505 if (code == ALIGN_INDIRECT_REF)
7507 int align = TYPE_ALIGN_UNIT (type);
7508 op0 = gen_rtx_AND (Pmode, op0, GEN_INT (-align));
7509 op0 = memory_address (mode, op0);
7512 temp = gen_rtx_MEM (mode, op0);
7514 set_mem_attributes (temp, exp, 0);
7516 /* Resolve the misalignment now, so that we don't have to remember
7517 to resolve it later. Of course, this only works for reads. */
7518 /* ??? When we get around to supporting writes, we'll have to handle
7519 this in store_expr directly. The vectorizer isn't generating
7520 those yet, however. */
7521 if (code == MISALIGNED_INDIRECT_REF)
7526 gcc_assert (modifier == EXPAND_NORMAL
7527 || modifier == EXPAND_STACK_PARM);
7529 /* The vectorizer should have already checked the mode. */
7530 icode = optab_handler (movmisalign_optab, mode)->insn_code;
7531 gcc_assert (icode != CODE_FOR_nothing);
7533 /* We've already validated the memory, and we're creating a
7534 new pseudo destination. The predicates really can't fail. */
7535 reg = gen_reg_rtx (mode);
7537 /* Nor can the insn generator. */
7538 insn = GEN_FCN (icode) (reg, temp);
7547 case TARGET_MEM_REF:
7549 struct mem_address addr;
7551 get_address_description (exp, &addr);
7552 op0 = addr_for_mem_ref (&addr, true);
7553 op0 = memory_address (mode, op0);
7554 temp = gen_rtx_MEM (mode, op0);
7555 set_mem_attributes (temp, TMR_ORIGINAL (exp), 0);
7562 tree array = TREE_OPERAND (exp, 0);
7563 tree index = TREE_OPERAND (exp, 1);
7565 /* Fold an expression like: "foo"[2].
7566 This is not done in fold so it won't happen inside &.
7567 Don't fold if this is for wide characters since it's too
7568 difficult to do correctly and this is a very rare case. */
7570 if (modifier != EXPAND_CONST_ADDRESS
7571 && modifier != EXPAND_INITIALIZER
7572 && modifier != EXPAND_MEMORY)
7574 tree t = fold_read_from_constant_string (exp);
7577 return expand_expr (t, target, tmode, modifier);
7580 /* If this is a constant index into a constant array,
7581 just get the value from the array. Handle both the cases when
7582 we have an explicit constructor and when our operand is a variable
7583 that was declared const. */
7585 if (modifier != EXPAND_CONST_ADDRESS
7586 && modifier != EXPAND_INITIALIZER
7587 && modifier != EXPAND_MEMORY
7588 && TREE_CODE (array) == CONSTRUCTOR
7589 && ! TREE_SIDE_EFFECTS (array)
7590 && TREE_CODE (index) == INTEGER_CST)
7592 unsigned HOST_WIDE_INT ix;
7595 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (array), ix,
7597 if (tree_int_cst_equal (field, index))
7599 if (!TREE_SIDE_EFFECTS (value))
7600 return expand_expr (fold (value), target, tmode, modifier);
7605 else if (optimize >= 1
7606 && modifier != EXPAND_CONST_ADDRESS
7607 && modifier != EXPAND_INITIALIZER
7608 && modifier != EXPAND_MEMORY
7609 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
7610 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
7611 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK
7612 && targetm.binds_local_p (array))
7614 if (TREE_CODE (index) == INTEGER_CST)
7616 tree init = DECL_INITIAL (array);
7618 if (TREE_CODE (init) == CONSTRUCTOR)
7620 unsigned HOST_WIDE_INT ix;
7623 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (init), ix,
7625 if (tree_int_cst_equal (field, index))
7627 if (TREE_SIDE_EFFECTS (value))
7630 if (TREE_CODE (value) == CONSTRUCTOR)
7632 /* If VALUE is a CONSTRUCTOR, this
7633 optimization is only useful if
7634 this doesn't store the CONSTRUCTOR
7635 into memory. If it does, it is more
7636 efficient to just load the data from
7637 the array directly. */
7638 rtx ret = expand_constructor (value, target,
7640 if (ret == NULL_RTX)
7644 return expand_expr (fold (value), target, tmode,
7648 else if(TREE_CODE (init) == STRING_CST)
7650 tree index1 = index;
7651 tree low_bound = array_ref_low_bound (exp);
7652 index1 = fold_convert (sizetype, TREE_OPERAND (exp, 1));
7654 /* Optimize the special-case of a zero lower bound.
7656 We convert the low_bound to sizetype to avoid some problems
7657 with constant folding. (E.g. suppose the lower bound is 1,
7658 and its mode is QI. Without the conversion,l (ARRAY
7659 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
7660 +INDEX), which becomes (ARRAY+255+INDEX). Opps!) */
7662 if (! integer_zerop (low_bound))
7663 index1 = size_diffop (index1, fold_convert (sizetype,
7666 if (0 > compare_tree_int (index1,
7667 TREE_STRING_LENGTH (init)))
7669 tree type = TREE_TYPE (TREE_TYPE (init));
7670 enum machine_mode mode = TYPE_MODE (type);
7672 if (GET_MODE_CLASS (mode) == MODE_INT
7673 && GET_MODE_SIZE (mode) == 1)
7674 return gen_int_mode (TREE_STRING_POINTER (init)
7675 [TREE_INT_CST_LOW (index1)],
7682 goto normal_inner_ref;
7685 /* If the operand is a CONSTRUCTOR, we can just extract the
7686 appropriate field if it is present. */
7687 if (TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR)
7689 unsigned HOST_WIDE_INT idx;
7692 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)),
7694 if (field == TREE_OPERAND (exp, 1)
7695 /* We can normally use the value of the field in the
7696 CONSTRUCTOR. However, if this is a bitfield in
7697 an integral mode that we can fit in a HOST_WIDE_INT,
7698 we must mask only the number of bits in the bitfield,
7699 since this is done implicitly by the constructor. If
7700 the bitfield does not meet either of those conditions,
7701 we can't do this optimization. */
7702 && (! DECL_BIT_FIELD (field)
7703 || ((GET_MODE_CLASS (DECL_MODE (field)) == MODE_INT)
7704 && (GET_MODE_BITSIZE (DECL_MODE (field))
7705 <= HOST_BITS_PER_WIDE_INT))))
7707 if (DECL_BIT_FIELD (field)
7708 && modifier == EXPAND_STACK_PARM)
7710 op0 = expand_expr (value, target, tmode, modifier);
7711 if (DECL_BIT_FIELD (field))
7713 HOST_WIDE_INT bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
7714 enum machine_mode imode = TYPE_MODE (TREE_TYPE (field));
7716 if (TYPE_UNSIGNED (TREE_TYPE (field)))
7718 op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
7719 op0 = expand_and (imode, op0, op1, target);
7724 = build_int_cst (NULL_TREE,
7725 GET_MODE_BITSIZE (imode) - bitsize);
7727 op0 = expand_shift (LSHIFT_EXPR, imode, op0, count,
7729 op0 = expand_shift (RSHIFT_EXPR, imode, op0, count,
7737 goto normal_inner_ref;
7740 case ARRAY_RANGE_REF:
7743 enum machine_mode mode1;
7744 HOST_WIDE_INT bitsize, bitpos;
7747 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
7748 &mode1, &unsignedp, &volatilep, true);
7751 /* If we got back the original object, something is wrong. Perhaps
7752 we are evaluating an expression too early. In any event, don't
7753 infinitely recurse. */
7754 gcc_assert (tem != exp);
7756 /* If TEM's type is a union of variable size, pass TARGET to the inner
7757 computation, since it will need a temporary and TARGET is known
7758 to have to do. This occurs in unchecked conversion in Ada. */
7762 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
7763 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
7765 && modifier != EXPAND_STACK_PARM
7766 ? target : NULL_RTX),
7768 (modifier == EXPAND_INITIALIZER
7769 || modifier == EXPAND_CONST_ADDRESS
7770 || modifier == EXPAND_STACK_PARM)
7771 ? modifier : EXPAND_NORMAL);
7773 /* If this is a constant, put it into a register if it is a legitimate
7774 constant, OFFSET is 0, and we won't try to extract outside the
7775 register (in case we were passed a partially uninitialized object
7776 or a view_conversion to a larger size). Force the constant to
7777 memory otherwise. */
7778 if (CONSTANT_P (op0))
7780 enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
7781 if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
7783 && bitpos + bitsize <= GET_MODE_BITSIZE (mode))
7784 op0 = force_reg (mode, op0);
7786 op0 = validize_mem (force_const_mem (mode, op0));
7789 /* Otherwise, if this object not in memory and we either have an
7790 offset, a BLKmode result, or a reference outside the object, put it
7791 there. Such cases can occur in Ada if we have unchecked conversion
7792 of an expression from a scalar type to an array or record type or
7793 for an ARRAY_RANGE_REF whose type is BLKmode. */
7794 else if (!MEM_P (op0)
7796 || (bitpos + bitsize > GET_MODE_BITSIZE (GET_MODE (op0)))
7797 || (code == ARRAY_RANGE_REF && mode == BLKmode)))
7799 tree nt = build_qualified_type (TREE_TYPE (tem),
7800 (TYPE_QUALS (TREE_TYPE (tem))
7801 | TYPE_QUAL_CONST));
7802 rtx memloc = assign_temp (nt, 1, 1, 1);
7804 emit_move_insn (memloc, op0);
7810 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode,
7813 gcc_assert (MEM_P (op0));
7815 #ifdef POINTERS_EXTEND_UNSIGNED
7816 if (GET_MODE (offset_rtx) != Pmode)
7817 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
7819 if (GET_MODE (offset_rtx) != ptr_mode)
7820 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
7823 if (GET_MODE (op0) == BLKmode
7824 /* A constant address in OP0 can have VOIDmode, we must
7825 not try to call force_reg in that case. */
7826 && GET_MODE (XEXP (op0, 0)) != VOIDmode
7828 && (bitpos % bitsize) == 0
7829 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
7830 && MEM_ALIGN (op0) == GET_MODE_ALIGNMENT (mode1))
7832 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
7836 op0 = offset_address (op0, offset_rtx,
7837 highest_pow2_factor (offset));
7840 /* If OFFSET is making OP0 more aligned than BIGGEST_ALIGNMENT,
7841 record its alignment as BIGGEST_ALIGNMENT. */
7842 if (MEM_P (op0) && bitpos == 0 && offset != 0
7843 && is_aligning_offset (offset, tem))
7844 set_mem_align (op0, BIGGEST_ALIGNMENT);
7846 /* Don't forget about volatility even if this is a bitfield. */
7847 if (MEM_P (op0) && volatilep && ! MEM_VOLATILE_P (op0))
7849 if (op0 == orig_op0)
7850 op0 = copy_rtx (op0);
7852 MEM_VOLATILE_P (op0) = 1;
7855 /* The following code doesn't handle CONCAT.
7856 Assume only bitpos == 0 can be used for CONCAT, due to
7857 one element arrays having the same mode as its element. */
7858 if (GET_CODE (op0) == CONCAT)
7860 gcc_assert (bitpos == 0
7861 && bitsize == GET_MODE_BITSIZE (GET_MODE (op0)));
7865 /* In cases where an aligned union has an unaligned object
7866 as a field, we might be extracting a BLKmode value from
7867 an integer-mode (e.g., SImode) object. Handle this case
7868 by doing the extract into an object as wide as the field
7869 (which we know to be the width of a basic mode), then
7870 storing into memory, and changing the mode to BLKmode. */
7871 if (mode1 == VOIDmode
7872 || REG_P (op0) || GET_CODE (op0) == SUBREG
7873 || (mode1 != BLKmode && ! direct_load[(int) mode1]
7874 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
7875 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT
7876 && modifier != EXPAND_CONST_ADDRESS
7877 && modifier != EXPAND_INITIALIZER)
7878 /* If the field isn't aligned enough to fetch as a memref,
7879 fetch it as a bit field. */
7880 || (mode1 != BLKmode
7881 && (((TYPE_ALIGN (TREE_TYPE (tem)) < GET_MODE_ALIGNMENT (mode)
7882 || (bitpos % GET_MODE_ALIGNMENT (mode) != 0)
7884 && (MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode1)
7885 || (bitpos % GET_MODE_ALIGNMENT (mode1) != 0))))
7886 && ((modifier == EXPAND_CONST_ADDRESS
7887 || modifier == EXPAND_INITIALIZER)
7889 : SLOW_UNALIGNED_ACCESS (mode1, MEM_ALIGN (op0))))
7890 || (bitpos % BITS_PER_UNIT != 0)))
7891 /* If the type and the field are a constant size and the
7892 size of the type isn't the same size as the bitfield,
7893 we must use bitfield operations. */
7895 && TYPE_SIZE (TREE_TYPE (exp))
7896 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
7897 && 0 != compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)),
7900 enum machine_mode ext_mode = mode;
7902 if (ext_mode == BLKmode
7903 && ! (target != 0 && MEM_P (op0)
7905 && bitpos % BITS_PER_UNIT == 0))
7906 ext_mode = mode_for_size (bitsize, MODE_INT, 1);
7908 if (ext_mode == BLKmode)
7911 target = assign_temp (type, 0, 1, 1);
7916 /* In this case, BITPOS must start at a byte boundary and
7917 TARGET, if specified, must be a MEM. */
7918 gcc_assert (MEM_P (op0)
7919 && (!target || MEM_P (target))
7920 && !(bitpos % BITS_PER_UNIT));
7922 emit_block_move (target,
7923 adjust_address (op0, VOIDmode,
7924 bitpos / BITS_PER_UNIT),
7925 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
7927 (modifier == EXPAND_STACK_PARM
7928 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
7933 op0 = validize_mem (op0);
7935 if (MEM_P (op0) && REG_P (XEXP (op0, 0)))
7936 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
7938 op0 = extract_bit_field (op0, bitsize, bitpos, unsignedp,
7939 (modifier == EXPAND_STACK_PARM
7940 ? NULL_RTX : target),
7941 ext_mode, ext_mode);
7943 /* If the result is a record type and BITSIZE is narrower than
7944 the mode of OP0, an integral mode, and this is a big endian
7945 machine, we must put the field into the high-order bits. */
7946 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
7947 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
7948 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (op0)))
7949 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
7950 size_int (GET_MODE_BITSIZE (GET_MODE (op0))
7954 /* If the result type is BLKmode, store the data into a temporary
7955 of the appropriate type, but with the mode corresponding to the
7956 mode for the data we have (op0's mode). It's tempting to make
7957 this a constant type, since we know it's only being stored once,
7958 but that can cause problems if we are taking the address of this
7959 COMPONENT_REF because the MEM of any reference via that address
7960 will have flags corresponding to the type, which will not
7961 necessarily be constant. */
7962 if (mode == BLKmode)
7964 HOST_WIDE_INT size = GET_MODE_BITSIZE (ext_mode);
7967 /* If the reference doesn't use the alias set of its type,
7968 we cannot create the temporary using that type. */
7969 if (component_uses_parent_alias_set (exp))
7971 new = assign_stack_local (ext_mode, size, 0);
7972 set_mem_alias_set (new, get_alias_set (exp));
7975 new = assign_stack_temp_for_type (ext_mode, size, 0, type);
7977 emit_move_insn (new, op0);
7978 op0 = copy_rtx (new);
7979 PUT_MODE (op0, BLKmode);
7980 set_mem_attributes (op0, exp, 1);
7986 /* If the result is BLKmode, use that to access the object
7988 if (mode == BLKmode)
7991 /* Get a reference to just this component. */
7992 if (modifier == EXPAND_CONST_ADDRESS
7993 || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7994 op0 = adjust_address_nv (op0, mode1, bitpos / BITS_PER_UNIT);
7996 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
7998 if (op0 == orig_op0)
7999 op0 = copy_rtx (op0);
8001 set_mem_attributes (op0, exp, 0);
8002 if (REG_P (XEXP (op0, 0)))
8003 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
8005 MEM_VOLATILE_P (op0) |= volatilep;
8006 if (mode == mode1 || mode1 == BLKmode || mode1 == tmode
8007 || modifier == EXPAND_CONST_ADDRESS
8008 || modifier == EXPAND_INITIALIZER)
8010 else if (target == 0)
8011 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
8013 convert_move (target, op0, unsignedp);
8018 return expand_expr (OBJ_TYPE_REF_EXPR (exp), target, tmode, modifier);
8021 /* All valid uses of __builtin_va_arg_pack () are removed during
8023 if (CALL_EXPR_VA_ARG_PACK (exp))
8024 error ("%Kinvalid use of %<__builtin_va_arg_pack ()%>", exp);
8026 tree fndecl = get_callee_fndecl (exp), attr;
8029 && (attr = lookup_attribute ("error",
8030 DECL_ATTRIBUTES (fndecl))) != NULL)
8031 error ("%Kcall to %qs declared with attribute error: %s",
8032 exp, lang_hooks.decl_printable_name (fndecl, 1),
8033 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr))));
8035 && (attr = lookup_attribute ("warning",
8036 DECL_ATTRIBUTES (fndecl))) != NULL)
8037 warning (0, "%Kcall to %qs declared with attribute warning: %s",
8038 exp, lang_hooks.decl_printable_name (fndecl, 1),
8039 TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr))));
8041 /* Check for a built-in function. */
8042 if (fndecl && DECL_BUILT_IN (fndecl))
8044 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_FRONTEND)
8045 return lang_hooks.expand_expr (exp, original_target,
8046 tmode, modifier, alt_rtl);
8048 return expand_builtin (exp, target, subtarget, tmode, ignore);
8051 return expand_call (exp, target, ignore);
8054 case NON_LVALUE_EXPR:
8057 if (TREE_OPERAND (exp, 0) == error_mark_node)
8060 if (TREE_CODE (type) == UNION_TYPE)
8062 tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0));
8064 /* If both input and output are BLKmode, this conversion isn't doing
8065 anything except possibly changing memory attribute. */
8066 if (mode == BLKmode && TYPE_MODE (valtype) == BLKmode)
8068 rtx result = expand_expr (TREE_OPERAND (exp, 0), target, tmode,
8071 result = copy_rtx (result);
8072 set_mem_attributes (result, exp, 0);
8078 if (TYPE_MODE (type) != BLKmode)
8079 target = gen_reg_rtx (TYPE_MODE (type));
8081 target = assign_temp (type, 0, 1, 1);
8085 /* Store data into beginning of memory target. */
8086 store_expr (TREE_OPERAND (exp, 0),
8087 adjust_address (target, TYPE_MODE (valtype), 0),
8088 modifier == EXPAND_STACK_PARM,
8093 gcc_assert (REG_P (target));
8095 /* Store this field into a union of the proper type. */
8096 store_field (target,
8097 MIN ((int_size_in_bytes (TREE_TYPE
8098 (TREE_OPERAND (exp, 0)))
8100 (HOST_WIDE_INT) GET_MODE_BITSIZE (mode)),
8101 0, TYPE_MODE (valtype), TREE_OPERAND (exp, 0),
8105 /* Return the entire union. */
8109 if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
8111 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode,
8114 /* If the signedness of the conversion differs and OP0 is
8115 a promoted SUBREG, clear that indication since we now
8116 have to do the proper extension. */
8117 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))) != unsignedp
8118 && GET_CODE (op0) == SUBREG)
8119 SUBREG_PROMOTED_VAR_P (op0) = 0;
8121 return REDUCE_BIT_FIELD (op0);
8124 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode,
8125 modifier == EXPAND_SUM ? EXPAND_NORMAL : modifier);
8126 if (GET_MODE (op0) == mode)
8129 /* If OP0 is a constant, just convert it into the proper mode. */
8130 else if (CONSTANT_P (op0))
8132 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
8133 enum machine_mode inner_mode = TYPE_MODE (inner_type);
8135 if (modifier == EXPAND_INITIALIZER)
8136 op0 = simplify_gen_subreg (mode, op0, inner_mode,
8137 subreg_lowpart_offset (mode,
8140 op0= convert_modes (mode, inner_mode, op0,
8141 TYPE_UNSIGNED (inner_type));
8144 else if (modifier == EXPAND_INITIALIZER)
8145 op0 = gen_rtx_fmt_e (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
8147 else if (target == 0)
8148 op0 = convert_to_mode (mode, op0,
8149 TYPE_UNSIGNED (TREE_TYPE
8150 (TREE_OPERAND (exp, 0))));
8153 convert_move (target, op0,
8154 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
8158 return REDUCE_BIT_FIELD (op0);
8160 case VIEW_CONVERT_EXPR:
8161 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, modifier);
8163 /* If the input and output modes are both the same, we are done. */
8164 if (TYPE_MODE (type) == GET_MODE (op0))
8166 /* If neither mode is BLKmode, and both modes are the same size
8167 then we can use gen_lowpart. */
8168 else if (TYPE_MODE (type) != BLKmode && GET_MODE (op0) != BLKmode
8169 && GET_MODE_SIZE (TYPE_MODE (type))
8170 == GET_MODE_SIZE (GET_MODE (op0)))
8172 if (GET_CODE (op0) == SUBREG)
8173 op0 = force_reg (GET_MODE (op0), op0);
8174 op0 = gen_lowpart (TYPE_MODE (type), op0);
8176 /* If both modes are integral, then we can convert from one to the
8178 else if (SCALAR_INT_MODE_P (GET_MODE (op0))
8179 && SCALAR_INT_MODE_P (TYPE_MODE (type)))
8180 op0 = convert_modes (TYPE_MODE (type), GET_MODE (op0), op0,
8181 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
8182 /* As a last resort, spill op0 to memory, and reload it in a
8184 else if (!MEM_P (op0))
8186 /* If the operand is not a MEM, force it into memory. Since we
8187 are going to be changing the mode of the MEM, don't call
8188 force_const_mem for constants because we don't allow pool
8189 constants to change mode. */
8190 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
8192 gcc_assert (!TREE_ADDRESSABLE (exp));
8194 if (target == 0 || GET_MODE (target) != TYPE_MODE (inner_type))
8196 = assign_stack_temp_for_type
8197 (TYPE_MODE (inner_type),
8198 GET_MODE_SIZE (TYPE_MODE (inner_type)), 0, inner_type);
8200 emit_move_insn (target, op0);
8204 /* At this point, OP0 is in the correct mode. If the output type is such
8205 that the operand is known to be aligned, indicate that it is.
8206 Otherwise, we need only be concerned about alignment for non-BLKmode
8210 op0 = copy_rtx (op0);
8212 if (TYPE_ALIGN_OK (type))
8213 set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type)));
8214 else if (TYPE_MODE (type) != BLKmode && STRICT_ALIGNMENT
8215 && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (TYPE_MODE (type)))
8217 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
8218 HOST_WIDE_INT temp_size
8219 = MAX (int_size_in_bytes (inner_type),
8220 (HOST_WIDE_INT) GET_MODE_SIZE (TYPE_MODE (type)));
8221 rtx new = assign_stack_temp_for_type (TYPE_MODE (type),
8222 temp_size, 0, type);
8223 rtx new_with_op0_mode = adjust_address (new, GET_MODE (op0), 0);
8225 gcc_assert (!TREE_ADDRESSABLE (exp));
8227 if (GET_MODE (op0) == BLKmode)
8228 emit_block_move (new_with_op0_mode, op0,
8229 GEN_INT (GET_MODE_SIZE (TYPE_MODE (type))),
8230 (modifier == EXPAND_STACK_PARM
8231 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
8233 emit_move_insn (new_with_op0_mode, op0);
8238 op0 = adjust_address (op0, TYPE_MODE (type), 0);
8243 case POINTER_PLUS_EXPR:
8244 /* Even though the sizetype mode and the pointer's mode can be different
8245 expand is able to handle this correctly and get the correct result out
8246 of the PLUS_EXPR code. */
8249 /* Check if this is a case for multiplication and addition. */
8250 if ((TREE_CODE (type) == INTEGER_TYPE
8251 || TREE_CODE (type) == FIXED_POINT_TYPE)
8252 && TREE_CODE (TREE_OPERAND (exp, 0)) == MULT_EXPR)
8254 tree subsubexp0, subsubexp1;
8255 enum tree_code code0, code1, this_code;
8257 subexp0 = TREE_OPERAND (exp, 0);
8258 subsubexp0 = TREE_OPERAND (subexp0, 0);
8259 subsubexp1 = TREE_OPERAND (subexp0, 1);
8260 code0 = TREE_CODE (subsubexp0);
8261 code1 = TREE_CODE (subsubexp1);
8262 this_code = TREE_CODE (type) == INTEGER_TYPE ? NOP_EXPR
8263 : FIXED_CONVERT_EXPR;
8264 if (code0 == this_code && code1 == this_code
8265 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8266 < TYPE_PRECISION (TREE_TYPE (subsubexp0)))
8267 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8268 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp1, 0))))
8269 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8270 == TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subsubexp1, 0)))))
8272 tree op0type = TREE_TYPE (TREE_OPERAND (subsubexp0, 0));
8273 enum machine_mode innermode = TYPE_MODE (op0type);
8274 bool zextend_p = TYPE_UNSIGNED (op0type);
8275 bool sat_p = TYPE_SATURATING (TREE_TYPE (subsubexp0));
8277 this_optab = zextend_p ? umadd_widen_optab : smadd_widen_optab;
8279 this_optab = zextend_p ? usmadd_widen_optab
8280 : ssmadd_widen_optab;
8281 if (mode == GET_MODE_2XWIDER_MODE (innermode)
8282 && (optab_handler (this_optab, mode)->insn_code
8283 != CODE_FOR_nothing))
8285 expand_operands (TREE_OPERAND (subsubexp0, 0),
8286 TREE_OPERAND (subsubexp1, 0),
8287 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8288 op2 = expand_expr (TREE_OPERAND (exp, 1), subtarget,
8289 VOIDmode, EXPAND_NORMAL);
8290 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
8293 return REDUCE_BIT_FIELD (temp);
8298 /* If we are adding a constant, a VAR_DECL that is sp, fp, or ap, and
8299 something else, make sure we add the register to the constant and
8300 then to the other thing. This case can occur during strength
8301 reduction and doing it this way will produce better code if the
8302 frame pointer or argument pointer is eliminated.
8304 fold-const.c will ensure that the constant is always in the inner
8305 PLUS_EXPR, so the only case we need to do anything about is if
8306 sp, ap, or fp is our second argument, in which case we must swap
8307 the innermost first argument and our second argument. */
8309 if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
8310 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST
8311 && TREE_CODE (TREE_OPERAND (exp, 1)) == VAR_DECL
8312 && (DECL_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx
8313 || DECL_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx
8314 || DECL_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx))
8316 tree t = TREE_OPERAND (exp, 1);
8318 TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
8319 TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t;
8322 /* If the result is to be ptr_mode and we are adding an integer to
8323 something, we might be forming a constant. So try to use
8324 plus_constant. If it produces a sum and we can't accept it,
8325 use force_operand. This allows P = &ARR[const] to generate
8326 efficient code on machines where a SYMBOL_REF is not a valid
8329 If this is an EXPAND_SUM call, always return the sum. */
8330 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
8331 || (mode == ptr_mode && (unsignedp || ! flag_trapv)))
8333 if (modifier == EXPAND_STACK_PARM)
8335 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
8336 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
8337 && TREE_CONSTANT (TREE_OPERAND (exp, 1)))
8341 op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
8343 /* Use immed_double_const to ensure that the constant is
8344 truncated according to the mode of OP1, then sign extended
8345 to a HOST_WIDE_INT. Using the constant directly can result
8346 in non-canonical RTL in a 64x32 cross compile. */
8348 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)),
8350 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))));
8351 op1 = plus_constant (op1, INTVAL (constant_part));
8352 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
8353 op1 = force_operand (op1, target);
8354 return REDUCE_BIT_FIELD (op1);
8357 else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
8358 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
8359 && TREE_CONSTANT (TREE_OPERAND (exp, 0)))
8363 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
8364 (modifier == EXPAND_INITIALIZER
8365 ? EXPAND_INITIALIZER : EXPAND_SUM));
8366 if (! CONSTANT_P (op0))
8368 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
8369 VOIDmode, modifier);
8370 /* Return a PLUS if modifier says it's OK. */
8371 if (modifier == EXPAND_SUM
8372 || modifier == EXPAND_INITIALIZER)
8373 return simplify_gen_binary (PLUS, mode, op0, op1);
8376 /* Use immed_double_const to ensure that the constant is
8377 truncated according to the mode of OP1, then sign extended
8378 to a HOST_WIDE_INT. Using the constant directly can result
8379 in non-canonical RTL in a 64x32 cross compile. */
8381 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)),
8383 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))));
8384 op0 = plus_constant (op0, INTVAL (constant_part));
8385 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
8386 op0 = force_operand (op0, target);
8387 return REDUCE_BIT_FIELD (op0);
8391 /* No sense saving up arithmetic to be done
8392 if it's all in the wrong mode to form part of an address.
8393 And force_operand won't know whether to sign-extend or
8395 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
8396 || mode != ptr_mode)
8398 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8399 subtarget, &op0, &op1, 0);
8400 if (op0 == const0_rtx)
8402 if (op1 == const0_rtx)
8407 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8408 subtarget, &op0, &op1, modifier);
8409 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
8412 /* Check if this is a case for multiplication and subtraction. */
8413 if ((TREE_CODE (type) == INTEGER_TYPE
8414 || TREE_CODE (type) == FIXED_POINT_TYPE)
8415 && TREE_CODE (TREE_OPERAND (exp, 1)) == MULT_EXPR)
8417 tree subsubexp0, subsubexp1;
8418 enum tree_code code0, code1, this_code;
8420 subexp1 = TREE_OPERAND (exp, 1);
8421 subsubexp0 = TREE_OPERAND (subexp1, 0);
8422 subsubexp1 = TREE_OPERAND (subexp1, 1);
8423 code0 = TREE_CODE (subsubexp0);
8424 code1 = TREE_CODE (subsubexp1);
8425 this_code = TREE_CODE (type) == INTEGER_TYPE ? NOP_EXPR
8426 : FIXED_CONVERT_EXPR;
8427 if (code0 == this_code && code1 == this_code
8428 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8429 < TYPE_PRECISION (TREE_TYPE (subsubexp0)))
8430 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8431 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subsubexp1, 0))))
8432 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subsubexp0, 0)))
8433 == TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subsubexp1, 0)))))
8435 tree op0type = TREE_TYPE (TREE_OPERAND (subsubexp0, 0));
8436 enum machine_mode innermode = TYPE_MODE (op0type);
8437 bool zextend_p = TYPE_UNSIGNED (op0type);
8438 bool sat_p = TYPE_SATURATING (TREE_TYPE (subsubexp0));
8440 this_optab = zextend_p ? umsub_widen_optab : smsub_widen_optab;
8442 this_optab = zextend_p ? usmsub_widen_optab
8443 : ssmsub_widen_optab;
8444 if (mode == GET_MODE_2XWIDER_MODE (innermode)
8445 && (optab_handler (this_optab, mode)->insn_code
8446 != CODE_FOR_nothing))
8448 expand_operands (TREE_OPERAND (subsubexp0, 0),
8449 TREE_OPERAND (subsubexp1, 0),
8450 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8451 op2 = expand_expr (TREE_OPERAND (exp, 0), subtarget,
8452 VOIDmode, EXPAND_NORMAL);
8453 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
8456 return REDUCE_BIT_FIELD (temp);
8461 /* For initializers, we are allowed to return a MINUS of two
8462 symbolic constants. Here we handle all cases when both operands
8464 /* Handle difference of two symbolic constants,
8465 for the sake of an initializer. */
8466 if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
8467 && really_constant_p (TREE_OPERAND (exp, 0))
8468 && really_constant_p (TREE_OPERAND (exp, 1)))
8470 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8471 NULL_RTX, &op0, &op1, modifier);
8473 /* If the last operand is a CONST_INT, use plus_constant of
8474 the negated constant. Else make the MINUS. */
8475 if (GET_CODE (op1) == CONST_INT)
8476 return REDUCE_BIT_FIELD (plus_constant (op0, - INTVAL (op1)));
8478 return REDUCE_BIT_FIELD (gen_rtx_MINUS (mode, op0, op1));
8481 /* No sense saving up arithmetic to be done
8482 if it's all in the wrong mode to form part of an address.
8483 And force_operand won't know whether to sign-extend or
8485 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
8486 || mode != ptr_mode)
8489 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8490 subtarget, &op0, &op1, modifier);
8492 /* Convert A - const to A + (-const). */
8493 if (GET_CODE (op1) == CONST_INT)
8495 op1 = negate_rtx (mode, op1);
8496 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
8502 /* If this is a fixed-point operation, then we cannot use the code
8503 below because "expand_mult" doesn't support sat/no-sat fixed-point
8505 if (ALL_FIXED_POINT_MODE_P (mode))
8508 /* If first operand is constant, swap them.
8509 Thus the following special case checks need only
8510 check the second operand. */
8511 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
8513 tree t1 = TREE_OPERAND (exp, 0);
8514 TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1);
8515 TREE_OPERAND (exp, 1) = t1;
8518 /* Attempt to return something suitable for generating an
8519 indexed address, for machines that support that. */
8521 if (modifier == EXPAND_SUM && mode == ptr_mode
8522 && host_integerp (TREE_OPERAND (exp, 1), 0))
8524 tree exp1 = TREE_OPERAND (exp, 1);
8526 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
8530 op0 = force_operand (op0, NULL_RTX);
8532 op0 = copy_to_mode_reg (mode, op0);
8534 return REDUCE_BIT_FIELD (gen_rtx_MULT (mode, op0,
8535 gen_int_mode (tree_low_cst (exp1, 0),
8536 TYPE_MODE (TREE_TYPE (exp1)))));
8539 if (modifier == EXPAND_STACK_PARM)
8542 /* Check for multiplying things that have been extended
8543 from a narrower type. If this machine supports multiplying
8544 in that narrower type with a result in the desired type,
8545 do it that way, and avoid the explicit type-conversion. */
8547 subexp0 = TREE_OPERAND (exp, 0);
8548 subexp1 = TREE_OPERAND (exp, 1);
8549 /* First, check if we have a multiplication of one signed and one
8550 unsigned operand. */
8551 if (TREE_CODE (subexp0) == NOP_EXPR
8552 && TREE_CODE (subexp1) == NOP_EXPR
8553 && TREE_CODE (type) == INTEGER_TYPE
8554 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
8555 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
8556 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
8557 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp1, 0))))
8558 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
8559 != TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp1, 0)))))
8561 enum machine_mode innermode
8562 = TYPE_MODE (TREE_TYPE (TREE_OPERAND (subexp0, 0)));
8563 this_optab = usmul_widen_optab;
8564 if (mode == GET_MODE_WIDER_MODE (innermode))
8566 if (optab_handler (this_optab, mode)->insn_code != CODE_FOR_nothing)
8568 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp0, 0))))
8569 expand_operands (TREE_OPERAND (subexp0, 0),
8570 TREE_OPERAND (subexp1, 0),
8571 NULL_RTX, &op0, &op1, 0);
8573 expand_operands (TREE_OPERAND (subexp0, 0),
8574 TREE_OPERAND (subexp1, 0),
8575 NULL_RTX, &op1, &op0, 0);
8581 /* Check for a multiplication with matching signedness. */
8582 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR
8583 && TREE_CODE (type) == INTEGER_TYPE
8584 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
8585 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
8586 && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
8587 && int_fits_type_p (TREE_OPERAND (exp, 1),
8588 TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
8589 /* Don't use a widening multiply if a shift will do. */
8590 && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))))
8591 > HOST_BITS_PER_WIDE_INT)
8592 || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0))
8594 (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
8595 && (TYPE_PRECISION (TREE_TYPE
8596 (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
8597 == TYPE_PRECISION (TREE_TYPE
8599 (TREE_OPERAND (exp, 0), 0))))
8600 /* If both operands are extended, they must either both
8601 be zero-extended or both be sign-extended. */
8602 && (TYPE_UNSIGNED (TREE_TYPE
8603 (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
8604 == TYPE_UNSIGNED (TREE_TYPE
8606 (TREE_OPERAND (exp, 0), 0)))))))
8608 tree op0type = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0));
8609 enum machine_mode innermode = TYPE_MODE (op0type);
8610 bool zextend_p = TYPE_UNSIGNED (op0type);
8611 optab other_optab = zextend_p ? smul_widen_optab : umul_widen_optab;
8612 this_optab = zextend_p ? umul_widen_optab : smul_widen_optab;
8614 if (mode == GET_MODE_2XWIDER_MODE (innermode))
8616 if (optab_handler (this_optab, mode)->insn_code != CODE_FOR_nothing)
8618 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
8619 expand_operands (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
8620 TREE_OPERAND (exp, 1),
8621 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8623 expand_operands (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
8624 TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
8625 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8628 else if (optab_handler (other_optab, mode)->insn_code != CODE_FOR_nothing
8629 && innermode == word_mode)
8632 op0 = expand_normal (TREE_OPERAND (TREE_OPERAND (exp, 0), 0));
8633 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
8634 op1 = convert_modes (innermode, mode,
8635 expand_normal (TREE_OPERAND (exp, 1)),
8638 op1 = expand_normal (TREE_OPERAND (TREE_OPERAND (exp, 1), 0));
8639 temp = expand_binop (mode, other_optab, op0, op1, target,
8640 unsignedp, OPTAB_LIB_WIDEN);
8641 hipart = gen_highpart (innermode, temp);
8642 htem = expand_mult_highpart_adjust (innermode, hipart,
8646 emit_move_insn (hipart, htem);
8647 return REDUCE_BIT_FIELD (temp);
8651 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8652 subtarget, &op0, &op1, 0);
8653 return REDUCE_BIT_FIELD (expand_mult (mode, op0, op1, target, unsignedp));
8655 case TRUNC_DIV_EXPR:
8656 case FLOOR_DIV_EXPR:
8658 case ROUND_DIV_EXPR:
8659 case EXACT_DIV_EXPR:
8660 /* If this is a fixed-point operation, then we cannot use the code
8661 below because "expand_divmod" doesn't support sat/no-sat fixed-point
8663 if (ALL_FIXED_POINT_MODE_P (mode))
8666 if (modifier == EXPAND_STACK_PARM)
8668 /* Possible optimization: compute the dividend with EXPAND_SUM
8669 then if the divisor is constant can optimize the case
8670 where some terms of the dividend have coeffs divisible by it. */
8671 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8672 subtarget, &op0, &op1, 0);
8673 return expand_divmod (0, code, mode, op0, op1, target, unsignedp);
8678 case TRUNC_MOD_EXPR:
8679 case FLOOR_MOD_EXPR:
8681 case ROUND_MOD_EXPR:
8682 if (modifier == EXPAND_STACK_PARM)
8684 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8685 subtarget, &op0, &op1, 0);
8686 return expand_divmod (1, code, mode, op0, op1, target, unsignedp);
8688 case FIXED_CONVERT_EXPR:
8689 op0 = expand_normal (TREE_OPERAND (exp, 0));
8690 if (target == 0 || modifier == EXPAND_STACK_PARM)
8691 target = gen_reg_rtx (mode);
8693 if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == INTEGER_TYPE
8694 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))))
8695 || (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type)))
8696 expand_fixed_convert (target, op0, 1, TYPE_SATURATING (type));
8698 expand_fixed_convert (target, op0, 0, TYPE_SATURATING (type));
8701 case FIX_TRUNC_EXPR:
8702 op0 = expand_normal (TREE_OPERAND (exp, 0));
8703 if (target == 0 || modifier == EXPAND_STACK_PARM)
8704 target = gen_reg_rtx (mode);
8705 expand_fix (target, op0, unsignedp);
8709 op0 = expand_normal (TREE_OPERAND (exp, 0));
8710 if (target == 0 || modifier == EXPAND_STACK_PARM)
8711 target = gen_reg_rtx (mode);
8712 /* expand_float can't figure out what to do if FROM has VOIDmode.
8713 So give it the correct mode. With -O, cse will optimize this. */
8714 if (GET_MODE (op0) == VOIDmode)
8715 op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
8717 expand_float (target, op0,
8718 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
8722 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget,
8723 VOIDmode, EXPAND_NORMAL);
8724 if (modifier == EXPAND_STACK_PARM)
8726 temp = expand_unop (mode,
8727 optab_for_tree_code (NEGATE_EXPR, type),
8730 return REDUCE_BIT_FIELD (temp);
8733 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget,
8734 VOIDmode, EXPAND_NORMAL);
8735 if (modifier == EXPAND_STACK_PARM)
8738 /* ABS_EXPR is not valid for complex arguments. */
8739 gcc_assert (GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
8740 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT);
8742 /* Unsigned abs is simply the operand. Testing here means we don't
8743 risk generating incorrect code below. */
8744 if (TYPE_UNSIGNED (type))
8747 return expand_abs (mode, op0, target, unsignedp,
8748 safe_from_p (target, TREE_OPERAND (exp, 0), 1));
8752 target = original_target;
8754 || modifier == EXPAND_STACK_PARM
8755 || (MEM_P (target) && MEM_VOLATILE_P (target))
8756 || GET_MODE (target) != mode
8758 && REGNO (target) < FIRST_PSEUDO_REGISTER))
8759 target = gen_reg_rtx (mode);
8760 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8761 target, &op0, &op1, 0);
8763 /* First try to do it with a special MIN or MAX instruction.
8764 If that does not win, use a conditional jump to select the proper
8766 this_optab = optab_for_tree_code (code, type);
8767 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
8772 /* At this point, a MEM target is no longer useful; we will get better
8775 if (! REG_P (target))
8776 target = gen_reg_rtx (mode);
8778 /* If op1 was placed in target, swap op0 and op1. */
8779 if (target != op0 && target == op1)
8786 /* We generate better code and avoid problems with op1 mentioning
8787 target by forcing op1 into a pseudo if it isn't a constant. */
8788 if (! CONSTANT_P (op1))
8789 op1 = force_reg (mode, op1);
8792 enum rtx_code comparison_code;
8795 if (code == MAX_EXPR)
8796 comparison_code = unsignedp ? GEU : GE;
8798 comparison_code = unsignedp ? LEU : LE;
8800 /* Canonicalize to comparisons against 0. */
8801 if (op1 == const1_rtx)
8803 /* Converting (a >= 1 ? a : 1) into (a > 0 ? a : 1)
8804 or (a != 0 ? a : 1) for unsigned.
8805 For MIN we are safe converting (a <= 1 ? a : 1)
8806 into (a <= 0 ? a : 1) */
8807 cmpop1 = const0_rtx;
8808 if (code == MAX_EXPR)
8809 comparison_code = unsignedp ? NE : GT;
8811 if (op1 == constm1_rtx && !unsignedp)
8813 /* Converting (a >= -1 ? a : -1) into (a >= 0 ? a : -1)
8814 and (a <= -1 ? a : -1) into (a < 0 ? a : -1) */
8815 cmpop1 = const0_rtx;
8816 if (code == MIN_EXPR)
8817 comparison_code = LT;
8819 #ifdef HAVE_conditional_move
8820 /* Use a conditional move if possible. */
8821 if (can_conditionally_move_p (mode))
8825 /* ??? Same problem as in expmed.c: emit_conditional_move
8826 forces a stack adjustment via compare_from_rtx, and we
8827 lose the stack adjustment if the sequence we are about
8828 to create is discarded. */
8829 do_pending_stack_adjust ();
8833 /* Try to emit the conditional move. */
8834 insn = emit_conditional_move (target, comparison_code,
8839 /* If we could do the conditional move, emit the sequence,
8843 rtx seq = get_insns ();
8849 /* Otherwise discard the sequence and fall back to code with
8855 emit_move_insn (target, op0);
8857 temp = gen_label_rtx ();
8858 do_compare_rtx_and_jump (target, cmpop1, comparison_code,
8859 unsignedp, mode, NULL_RTX, NULL_RTX, temp);
8861 emit_move_insn (target, op1);
8866 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget,
8867 VOIDmode, EXPAND_NORMAL);
8868 if (modifier == EXPAND_STACK_PARM)
8870 temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
8874 /* ??? Can optimize bitwise operations with one arg constant.
8875 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
8876 and (a bitwise1 b) bitwise2 b (etc)
8877 but that is probably not worth while. */
8879 /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two
8880 boolean values when we want in all cases to compute both of them. In
8881 general it is fastest to do TRUTH_AND_EXPR by computing both operands
8882 as actual zero-or-1 values and then bitwise anding. In cases where
8883 there cannot be any side effects, better code would be made by
8884 treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is
8885 how to recognize those cases. */
8887 case TRUTH_AND_EXPR:
8888 code = BIT_AND_EXPR;
8893 code = BIT_IOR_EXPR;
8897 case TRUTH_XOR_EXPR:
8898 code = BIT_XOR_EXPR;
8904 /* The expansion code only handles expansion of mode precision
8906 gcc_assert (GET_MODE_PRECISION (TYPE_MODE (type))
8907 == TYPE_PRECISION (type));
8912 /* If this is a fixed-point operation, then we cannot use the code
8913 below because "expand_shift" doesn't support sat/no-sat fixed-point
8915 if (ALL_FIXED_POINT_MODE_P (mode))
8918 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
8920 if (modifier == EXPAND_STACK_PARM)
8922 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget,
8923 VOIDmode, EXPAND_NORMAL);
8924 temp = expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target,
8926 if (code == LSHIFT_EXPR)
8927 temp = REDUCE_BIT_FIELD (temp);
8930 /* Could determine the answer when only additive constants differ. Also,
8931 the addition of one can be handled by changing the condition. */
8938 case UNORDERED_EXPR:
8946 temp = do_store_flag (exp,
8947 modifier != EXPAND_STACK_PARM ? target : NULL_RTX,
8948 tmode != VOIDmode ? tmode : mode, 0);
8952 /* For foo != 0, load foo, and if it is nonzero load 1 instead. */
8953 if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1))
8955 && REG_P (original_target)
8956 && (GET_MODE (original_target)
8957 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
8959 temp = expand_expr (TREE_OPERAND (exp, 0), original_target,
8960 VOIDmode, EXPAND_NORMAL);
8962 /* If temp is constant, we can just compute the result. */
8963 if (GET_CODE (temp) == CONST_INT)
8965 if (INTVAL (temp) != 0)
8966 emit_move_insn (target, const1_rtx);
8968 emit_move_insn (target, const0_rtx);
8973 if (temp != original_target)
8975 enum machine_mode mode1 = GET_MODE (temp);
8976 if (mode1 == VOIDmode)
8977 mode1 = tmode != VOIDmode ? tmode : mode;
8979 temp = copy_to_mode_reg (mode1, temp);
8982 op1 = gen_label_rtx ();
8983 emit_cmp_and_jump_insns (temp, const0_rtx, EQ, NULL_RTX,
8984 GET_MODE (temp), unsignedp, op1);
8985 emit_move_insn (temp, const1_rtx);
8990 /* If no set-flag instruction, must generate a conditional store
8991 into a temporary variable. Drop through and handle this
8996 || modifier == EXPAND_STACK_PARM
8997 || ! safe_from_p (target, exp, 1)
8998 /* Make sure we don't have a hard reg (such as function's return
8999 value) live across basic blocks, if not optimizing. */
9000 || (!optimize && REG_P (target)
9001 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
9002 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
9005 emit_move_insn (target, const0_rtx);
9007 op1 = gen_label_rtx ();
9008 jumpifnot (exp, op1);
9011 emit_move_insn (target, const1_rtx);
9014 return ignore ? const0_rtx : target;
9016 case TRUTH_NOT_EXPR:
9017 if (modifier == EXPAND_STACK_PARM)
9019 op0 = expand_expr (TREE_OPERAND (exp, 0), target,
9020 VOIDmode, EXPAND_NORMAL);
9021 /* The parser is careful to generate TRUTH_NOT_EXPR
9022 only with operands that are always zero or one. */
9023 temp = expand_binop (mode, xor_optab, op0, const1_rtx,
9024 target, 1, OPTAB_LIB_WIDEN);
9028 case STATEMENT_LIST:
9030 tree_stmt_iterator iter;
9032 gcc_assert (ignore);
9034 for (iter = tsi_start (exp); !tsi_end_p (iter); tsi_next (&iter))
9035 expand_expr (tsi_stmt (iter), const0_rtx, VOIDmode, modifier);
9040 /* A COND_EXPR with its type being VOID_TYPE represents a
9041 conditional jump and is handled in
9042 expand_gimple_cond_expr. */
9043 gcc_assert (!VOID_TYPE_P (TREE_TYPE (exp)));
9045 /* Note that COND_EXPRs whose type is a structure or union
9046 are required to be constructed to contain assignments of
9047 a temporary variable, so that we can evaluate them here
9048 for side effect only. If type is void, we must do likewise. */
9050 gcc_assert (!TREE_ADDRESSABLE (type)
9052 && TREE_TYPE (TREE_OPERAND (exp, 1)) != void_type_node
9053 && TREE_TYPE (TREE_OPERAND (exp, 2)) != void_type_node);
9055 /* If we are not to produce a result, we have no target. Otherwise,
9056 if a target was specified use it; it will not be used as an
9057 intermediate target unless it is safe. If no target, use a
9060 if (modifier != EXPAND_STACK_PARM
9062 && safe_from_p (original_target, TREE_OPERAND (exp, 0), 1)
9063 && GET_MODE (original_target) == mode
9064 #ifdef HAVE_conditional_move
9065 && (! can_conditionally_move_p (mode)
9066 || REG_P (original_target))
9068 && !MEM_P (original_target))
9069 temp = original_target;
9071 temp = assign_temp (type, 0, 0, 1);
9073 do_pending_stack_adjust ();
9075 op0 = gen_label_rtx ();
9076 op1 = gen_label_rtx ();
9077 jumpifnot (TREE_OPERAND (exp, 0), op0);
9078 store_expr (TREE_OPERAND (exp, 1), temp,
9079 modifier == EXPAND_STACK_PARM,
9082 emit_jump_insn (gen_jump (op1));
9085 store_expr (TREE_OPERAND (exp, 2), temp,
9086 modifier == EXPAND_STACK_PARM,
9094 target = expand_vec_cond_expr (exp, target);
9099 tree lhs = TREE_OPERAND (exp, 0);
9100 tree rhs = TREE_OPERAND (exp, 1);
9101 gcc_assert (ignore);
9102 expand_assignment (lhs, rhs, false);
9106 case GIMPLE_MODIFY_STMT:
9108 tree lhs = GIMPLE_STMT_OPERAND (exp, 0);
9109 tree rhs = GIMPLE_STMT_OPERAND (exp, 1);
9111 gcc_assert (ignore);
9113 /* Check for |= or &= of a bitfield of size one into another bitfield
9114 of size 1. In this case, (unless we need the result of the
9115 assignment) we can do this more efficiently with a
9116 test followed by an assignment, if necessary.
9118 ??? At this point, we can't get a BIT_FIELD_REF here. But if
9119 things change so we do, this code should be enhanced to
9121 if (TREE_CODE (lhs) == COMPONENT_REF
9122 && (TREE_CODE (rhs) == BIT_IOR_EXPR
9123 || TREE_CODE (rhs) == BIT_AND_EXPR)
9124 && TREE_OPERAND (rhs, 0) == lhs
9125 && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
9126 && integer_onep (DECL_SIZE (TREE_OPERAND (lhs, 1)))
9127 && integer_onep (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))))
9129 rtx label = gen_label_rtx ();
9130 int value = TREE_CODE (rhs) == BIT_IOR_EXPR;
9131 do_jump (TREE_OPERAND (rhs, 1),
9134 expand_assignment (lhs, build_int_cst (TREE_TYPE (rhs), value),
9135 MOVE_NONTEMPORAL (exp));
9136 do_pending_stack_adjust ();
9141 expand_assignment (lhs, rhs, MOVE_NONTEMPORAL (exp));
9146 if (!TREE_OPERAND (exp, 0))
9147 expand_null_return ();
9149 expand_return (TREE_OPERAND (exp, 0));
9153 return expand_expr_addr_expr (exp, target, tmode, modifier);
9156 /* Get the rtx code of the operands. */
9157 op0 = expand_normal (TREE_OPERAND (exp, 0));
9158 op1 = expand_normal (TREE_OPERAND (exp, 1));
9161 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
9163 /* Move the real (op0) and imaginary (op1) parts to their location. */
9164 write_complex_part (target, op0, false);
9165 write_complex_part (target, op1, true);
9170 op0 = expand_normal (TREE_OPERAND (exp, 0));
9171 return read_complex_part (op0, false);
9174 op0 = expand_normal (TREE_OPERAND (exp, 0));
9175 return read_complex_part (op0, true);
9178 expand_resx_expr (exp);
9181 case TRY_CATCH_EXPR:
9183 case EH_FILTER_EXPR:
9184 case TRY_FINALLY_EXPR:
9185 /* Lowered by tree-eh.c. */
9188 case WITH_CLEANUP_EXPR:
9189 case CLEANUP_POINT_EXPR:
9191 case CASE_LABEL_EXPR:
9197 case PREINCREMENT_EXPR:
9198 case PREDECREMENT_EXPR:
9199 case POSTINCREMENT_EXPR:
9200 case POSTDECREMENT_EXPR:
9203 case TRUTH_ANDIF_EXPR:
9204 case TRUTH_ORIF_EXPR:
9205 /* Lowered by gimplify.c. */
9208 case CHANGE_DYNAMIC_TYPE_EXPR:
9209 /* This is ignored at the RTL level. The tree level set
9210 DECL_POINTER_ALIAS_SET of any variable to be 0, which is
9211 overkill for the RTL layer but is all that we can
9216 return get_exception_pointer (cfun);
9219 return get_exception_filter (cfun);
9222 /* Function descriptors are not valid except for as
9223 initialization constants, and should not be expanded. */
9231 expand_label (TREE_OPERAND (exp, 0));
9235 expand_asm_expr (exp);
9238 case WITH_SIZE_EXPR:
9239 /* WITH_SIZE_EXPR expands to its first argument. The caller should
9240 have pulled out the size to use in whatever context it needed. */
9241 return expand_expr_real (TREE_OPERAND (exp, 0), original_target, tmode,
9244 case REALIGN_LOAD_EXPR:
9246 tree oprnd0 = TREE_OPERAND (exp, 0);
9247 tree oprnd1 = TREE_OPERAND (exp, 1);
9248 tree oprnd2 = TREE_OPERAND (exp, 2);
9251 this_optab = optab_for_tree_code (code, type);
9252 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
9253 op2 = expand_normal (oprnd2);
9254 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
9262 tree oprnd0 = TREE_OPERAND (exp, 0);
9263 tree oprnd1 = TREE_OPERAND (exp, 1);
9264 tree oprnd2 = TREE_OPERAND (exp, 2);
9267 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
9268 op2 = expand_normal (oprnd2);
9269 target = expand_widen_pattern_expr (exp, op0, op1, op2,
9274 case WIDEN_SUM_EXPR:
9276 tree oprnd0 = TREE_OPERAND (exp, 0);
9277 tree oprnd1 = TREE_OPERAND (exp, 1);
9279 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, 0);
9280 target = expand_widen_pattern_expr (exp, op0, NULL_RTX, op1,
9285 case REDUC_MAX_EXPR:
9286 case REDUC_MIN_EXPR:
9287 case REDUC_PLUS_EXPR:
9289 op0 = expand_normal (TREE_OPERAND (exp, 0));
9290 this_optab = optab_for_tree_code (code, type);
9291 temp = expand_unop (mode, this_optab, op0, target, unsignedp);
9296 case VEC_EXTRACT_EVEN_EXPR:
9297 case VEC_EXTRACT_ODD_EXPR:
9299 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
9300 NULL_RTX, &op0, &op1, 0);
9301 this_optab = optab_for_tree_code (code, type);
9302 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
9308 case VEC_INTERLEAVE_HIGH_EXPR:
9309 case VEC_INTERLEAVE_LOW_EXPR:
9311 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
9312 NULL_RTX, &op0, &op1, 0);
9313 this_optab = optab_for_tree_code (code, type);
9314 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
9320 case VEC_LSHIFT_EXPR:
9321 case VEC_RSHIFT_EXPR:
9323 target = expand_vec_shift_expr (exp, target);
9327 case VEC_UNPACK_HI_EXPR:
9328 case VEC_UNPACK_LO_EXPR:
9330 op0 = expand_normal (TREE_OPERAND (exp, 0));
9331 this_optab = optab_for_tree_code (code, type);
9332 temp = expand_widen_pattern_expr (exp, op0, NULL_RTX, NULL_RTX,
9338 case VEC_UNPACK_FLOAT_HI_EXPR:
9339 case VEC_UNPACK_FLOAT_LO_EXPR:
9341 op0 = expand_normal (TREE_OPERAND (exp, 0));
9342 /* The signedness is determined from input operand. */
9343 this_optab = optab_for_tree_code (code,
9344 TREE_TYPE (TREE_OPERAND (exp, 0)));
9345 temp = expand_widen_pattern_expr
9346 (exp, op0, NULL_RTX, NULL_RTX,
9347 target, TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
9353 case VEC_WIDEN_MULT_HI_EXPR:
9354 case VEC_WIDEN_MULT_LO_EXPR:
9356 tree oprnd0 = TREE_OPERAND (exp, 0);
9357 tree oprnd1 = TREE_OPERAND (exp, 1);
9359 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, 0);
9360 target = expand_widen_pattern_expr (exp, op0, op1, NULL_RTX,
9362 gcc_assert (target);
9366 case VEC_PACK_TRUNC_EXPR:
9367 case VEC_PACK_SAT_EXPR:
9368 case VEC_PACK_FIX_TRUNC_EXPR:
9370 mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
9374 case OMP_ATOMIC_LOAD:
9375 case OMP_ATOMIC_STORE:
9376 /* OMP expansion is not run when there were errors, so these codes
9378 gcc_assert (errorcount != 0);
9382 return lang_hooks.expand_expr (exp, original_target, tmode,
9386 /* Here to do an ordinary binary operator. */
9388 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
9389 subtarget, &op0, &op1, 0);
9391 this_optab = optab_for_tree_code (code, type);
9393 if (modifier == EXPAND_STACK_PARM)
9395 temp = expand_binop (mode, this_optab, op0, op1, target,
9396 unsignedp, OPTAB_LIB_WIDEN);
9398 return REDUCE_BIT_FIELD (temp);
9400 #undef REDUCE_BIT_FIELD
9402 /* Subroutine of above: reduce EXP to the precision of TYPE (in the
9403 signedness of TYPE), possibly returning the result in TARGET. */
9405 reduce_to_bit_field_precision (rtx exp, rtx target, tree type)
9407 HOST_WIDE_INT prec = TYPE_PRECISION (type);
9408 if (target && GET_MODE (target) != GET_MODE (exp))
9410 /* For constant values, reduce using build_int_cst_type. */
9411 if (GET_CODE (exp) == CONST_INT)
9413 HOST_WIDE_INT value = INTVAL (exp);
9414 tree t = build_int_cst_type (type, value);
9415 return expand_expr (t, target, VOIDmode, EXPAND_NORMAL);
9417 else if (TYPE_UNSIGNED (type))
9420 if (prec < HOST_BITS_PER_WIDE_INT)
9421 mask = immed_double_const (((unsigned HOST_WIDE_INT) 1 << prec) - 1, 0,
9424 mask = immed_double_const ((unsigned HOST_WIDE_INT) -1,
9425 ((unsigned HOST_WIDE_INT) 1
9426 << (prec - HOST_BITS_PER_WIDE_INT)) - 1,
9428 return expand_and (GET_MODE (exp), exp, mask, target);
9432 tree count = build_int_cst (NULL_TREE,
9433 GET_MODE_BITSIZE (GET_MODE (exp)) - prec);
9434 exp = expand_shift (LSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
9435 return expand_shift (RSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
9439 /* Subroutine of above: returns 1 if OFFSET corresponds to an offset that
9440 when applied to the address of EXP produces an address known to be
9441 aligned more than BIGGEST_ALIGNMENT. */
9444 is_aligning_offset (const_tree offset, const_tree exp)
9446 /* Strip off any conversions. */
9447 while (TREE_CODE (offset) == NON_LVALUE_EXPR
9448 || TREE_CODE (offset) == NOP_EXPR
9449 || TREE_CODE (offset) == CONVERT_EXPR)
9450 offset = TREE_OPERAND (offset, 0);
9452 /* We must now have a BIT_AND_EXPR with a constant that is one less than
9453 power of 2 and which is larger than BIGGEST_ALIGNMENT. */
9454 if (TREE_CODE (offset) != BIT_AND_EXPR
9455 || !host_integerp (TREE_OPERAND (offset, 1), 1)
9456 || compare_tree_int (TREE_OPERAND (offset, 1),
9457 BIGGEST_ALIGNMENT / BITS_PER_UNIT) <= 0
9458 || !exact_log2 (tree_low_cst (TREE_OPERAND (offset, 1), 1) + 1) < 0)
9461 /* Look at the first operand of BIT_AND_EXPR and strip any conversion.
9462 It must be NEGATE_EXPR. Then strip any more conversions. */
9463 offset = TREE_OPERAND (offset, 0);
9464 while (TREE_CODE (offset) == NON_LVALUE_EXPR
9465 || TREE_CODE (offset) == NOP_EXPR
9466 || TREE_CODE (offset) == CONVERT_EXPR)
9467 offset = TREE_OPERAND (offset, 0);
9469 if (TREE_CODE (offset) != NEGATE_EXPR)
9472 offset = TREE_OPERAND (offset, 0);
9473 while (TREE_CODE (offset) == NON_LVALUE_EXPR
9474 || TREE_CODE (offset) == NOP_EXPR
9475 || TREE_CODE (offset) == CONVERT_EXPR)
9476 offset = TREE_OPERAND (offset, 0);
9478 /* This must now be the address of EXP. */
9479 return TREE_CODE (offset) == ADDR_EXPR && TREE_OPERAND (offset, 0) == exp;
9482 /* Return the tree node if an ARG corresponds to a string constant or zero
9483 if it doesn't. If we return nonzero, set *PTR_OFFSET to the offset
9484 in bytes within the string that ARG is accessing. The type of the
9485 offset will be `sizetype'. */
9488 string_constant (tree arg, tree *ptr_offset)
9490 tree array, offset, lower_bound;
9493 if (TREE_CODE (arg) == ADDR_EXPR)
9495 if (TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
9497 *ptr_offset = size_zero_node;
9498 return TREE_OPERAND (arg, 0);
9500 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == VAR_DECL)
9502 array = TREE_OPERAND (arg, 0);
9503 offset = size_zero_node;
9505 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF)
9507 array = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
9508 offset = TREE_OPERAND (TREE_OPERAND (arg, 0), 1);
9509 if (TREE_CODE (array) != STRING_CST
9510 && TREE_CODE (array) != VAR_DECL)
9513 /* Check if the array has a nonzero lower bound. */
9514 lower_bound = array_ref_low_bound (TREE_OPERAND (arg, 0));
9515 if (!integer_zerop (lower_bound))
9517 /* If the offset and base aren't both constants, return 0. */
9518 if (TREE_CODE (lower_bound) != INTEGER_CST)
9520 if (TREE_CODE (offset) != INTEGER_CST)
9522 /* Adjust offset by the lower bound. */
9523 offset = size_diffop (fold_convert (sizetype, offset),
9524 fold_convert (sizetype, lower_bound));
9530 else if (TREE_CODE (arg) == PLUS_EXPR || TREE_CODE (arg) == POINTER_PLUS_EXPR)
9532 tree arg0 = TREE_OPERAND (arg, 0);
9533 tree arg1 = TREE_OPERAND (arg, 1);
9538 if (TREE_CODE (arg0) == ADDR_EXPR
9539 && (TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST
9540 || TREE_CODE (TREE_OPERAND (arg0, 0)) == VAR_DECL))
9542 array = TREE_OPERAND (arg0, 0);
9545 else if (TREE_CODE (arg1) == ADDR_EXPR
9546 && (TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST
9547 || TREE_CODE (TREE_OPERAND (arg1, 0)) == VAR_DECL))
9549 array = TREE_OPERAND (arg1, 0);
9558 if (TREE_CODE (array) == STRING_CST)
9560 *ptr_offset = fold_convert (sizetype, offset);
9563 else if (TREE_CODE (array) == VAR_DECL)
9567 /* Variables initialized to string literals can be handled too. */
9568 if (DECL_INITIAL (array) == NULL_TREE
9569 || TREE_CODE (DECL_INITIAL (array)) != STRING_CST)
9572 /* If they are read-only, non-volatile and bind locally. */
9573 if (! TREE_READONLY (array)
9574 || TREE_SIDE_EFFECTS (array)
9575 || ! targetm.binds_local_p (array))
9578 /* Avoid const char foo[4] = "abcde"; */
9579 if (DECL_SIZE_UNIT (array) == NULL_TREE
9580 || TREE_CODE (DECL_SIZE_UNIT (array)) != INTEGER_CST
9581 || (length = TREE_STRING_LENGTH (DECL_INITIAL (array))) <= 0
9582 || compare_tree_int (DECL_SIZE_UNIT (array), length) < 0)
9585 /* If variable is bigger than the string literal, OFFSET must be constant
9586 and inside of the bounds of the string literal. */
9587 offset = fold_convert (sizetype, offset);
9588 if (compare_tree_int (DECL_SIZE_UNIT (array), length) > 0
9589 && (! host_integerp (offset, 1)
9590 || compare_tree_int (offset, length) >= 0))
9593 *ptr_offset = offset;
9594 return DECL_INITIAL (array);
9600 /* Generate code to calculate EXP using a store-flag instruction
9601 and return an rtx for the result. EXP is either a comparison
9602 or a TRUTH_NOT_EXPR whose operand is a comparison.
9604 If TARGET is nonzero, store the result there if convenient.
9606 If ONLY_CHEAP is nonzero, only do this if it is likely to be very
9609 Return zero if there is no suitable set-flag instruction
9610 available on this machine.
9612 Once expand_expr has been called on the arguments of the comparison,
9613 we are committed to doing the store flag, since it is not safe to
9614 re-evaluate the expression. We emit the store-flag insn by calling
9615 emit_store_flag, but only expand the arguments if we have a reason
9616 to believe that emit_store_flag will be successful. If we think that
9617 it will, but it isn't, we have to simulate the store-flag with a
9618 set/jump/set sequence. */
9621 do_store_flag (tree exp, rtx target, enum machine_mode mode, int only_cheap)
9624 tree arg0, arg1, type;
9626 enum machine_mode operand_mode;
9630 enum insn_code icode;
9631 rtx subtarget = target;
9634 /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the
9635 result at the end. We can't simply invert the test since it would
9636 have already been inverted if it were valid. This case occurs for
9637 some floating-point comparisons. */
9639 if (TREE_CODE (exp) == TRUTH_NOT_EXPR)
9640 invert = 1, exp = TREE_OPERAND (exp, 0);
9642 arg0 = TREE_OPERAND (exp, 0);
9643 arg1 = TREE_OPERAND (exp, 1);
9645 /* Don't crash if the comparison was erroneous. */
9646 if (arg0 == error_mark_node || arg1 == error_mark_node)
9649 type = TREE_TYPE (arg0);
9650 operand_mode = TYPE_MODE (type);
9651 unsignedp = TYPE_UNSIGNED (type);
9653 /* We won't bother with BLKmode store-flag operations because it would mean
9654 passing a lot of information to emit_store_flag. */
9655 if (operand_mode == BLKmode)
9658 /* We won't bother with store-flag operations involving function pointers
9659 when function pointers must be canonicalized before comparisons. */
9660 #ifdef HAVE_canonicalize_funcptr_for_compare
9661 if (HAVE_canonicalize_funcptr_for_compare
9662 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
9663 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
9665 || (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
9666 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
9667 == FUNCTION_TYPE))))
9674 /* Get the rtx comparison code to use. We know that EXP is a comparison
9675 operation of some type. Some comparisons against 1 and -1 can be
9676 converted to comparisons with zero. Do so here so that the tests
9677 below will be aware that we have a comparison with zero. These
9678 tests will not catch constants in the first operand, but constants
9679 are rarely passed as the first operand. */
9681 switch (TREE_CODE (exp))
9690 if (integer_onep (arg1))
9691 arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
9693 code = unsignedp ? LTU : LT;
9696 if (! unsignedp && integer_all_onesp (arg1))
9697 arg1 = integer_zero_node, code = LT;
9699 code = unsignedp ? LEU : LE;
9702 if (! unsignedp && integer_all_onesp (arg1))
9703 arg1 = integer_zero_node, code = GE;
9705 code = unsignedp ? GTU : GT;
9708 if (integer_onep (arg1))
9709 arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
9711 code = unsignedp ? GEU : GE;
9714 case UNORDERED_EXPR:
9743 /* Put a constant second. */
9744 if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST
9745 || TREE_CODE (arg0) == FIXED_CST)
9747 tem = arg0; arg0 = arg1; arg1 = tem;
9748 code = swap_condition (code);
9751 /* If this is an equality or inequality test of a single bit, we can
9752 do this by shifting the bit being tested to the low-order bit and
9753 masking the result with the constant 1. If the condition was EQ,
9754 we xor it with 1. This does not require an scc insn and is faster
9755 than an scc insn even if we have it.
9757 The code to make this transformation was moved into fold_single_bit_test,
9758 so we just call into the folder and expand its result. */
9760 if ((code == NE || code == EQ)
9761 && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
9762 && integer_pow2p (TREE_OPERAND (arg0, 1)))
9764 tree type = lang_hooks.types.type_for_mode (mode, unsignedp);
9765 return expand_expr (fold_single_bit_test (code == NE ? NE_EXPR : EQ_EXPR,
9767 target, VOIDmode, EXPAND_NORMAL);
9770 /* Now see if we are likely to be able to do this. Return if not. */
9771 if (! can_compare_p (code, operand_mode, ccp_store_flag))
9774 icode = setcc_gen_code[(int) code];
9776 if (icode == CODE_FOR_nothing)
9778 enum machine_mode wmode;
9780 for (wmode = operand_mode;
9781 icode == CODE_FOR_nothing && wmode != VOIDmode;
9782 wmode = GET_MODE_WIDER_MODE (wmode))
9783 icode = optab_handler (cstore_optab, wmode)->insn_code;
9786 if (icode == CODE_FOR_nothing
9787 || (only_cheap && insn_data[(int) icode].operand[0].mode != mode))
9789 /* We can only do this if it is one of the special cases that
9790 can be handled without an scc insn. */
9791 if ((code == LT && integer_zerop (arg1))
9792 || (! only_cheap && code == GE && integer_zerop (arg1)))
9794 else if (! only_cheap && (code == NE || code == EQ)
9795 && TREE_CODE (type) != REAL_TYPE
9796 && ((optab_handler (abs_optab, operand_mode)->insn_code
9797 != CODE_FOR_nothing)
9798 || (optab_handler (ffs_optab, operand_mode)->insn_code
9799 != CODE_FOR_nothing)))
9805 if (! get_subtarget (target)
9806 || GET_MODE (subtarget) != operand_mode)
9809 expand_operands (arg0, arg1, subtarget, &op0, &op1, 0);
9812 target = gen_reg_rtx (mode);
9814 result = emit_store_flag (target, code, op0, op1,
9815 operand_mode, unsignedp, 1);
9820 result = expand_binop (mode, xor_optab, result, const1_rtx,
9821 result, 0, OPTAB_LIB_WIDEN);
9825 /* If this failed, we have to do this with set/compare/jump/set code. */
9827 || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1))
9828 target = gen_reg_rtx (GET_MODE (target));
9830 emit_move_insn (target, invert ? const0_rtx : const1_rtx);
9831 label = gen_label_rtx ();
9832 do_compare_rtx_and_jump (op0, op1, code, unsignedp, operand_mode, NULL_RTX,
9835 emit_move_insn (target, invert ? const1_rtx : const0_rtx);
9842 /* Stubs in case we haven't got a casesi insn. */
9844 # define HAVE_casesi 0
9845 # define gen_casesi(a, b, c, d, e) (0)
9846 # define CODE_FOR_casesi CODE_FOR_nothing
9849 /* If the machine does not have a case insn that compares the bounds,
9850 this means extra overhead for dispatch tables, which raises the
9851 threshold for using them. */
9852 #ifndef CASE_VALUES_THRESHOLD
9853 #define CASE_VALUES_THRESHOLD (HAVE_casesi ? 4 : 5)
9854 #endif /* CASE_VALUES_THRESHOLD */
9857 case_values_threshold (void)
9859 return CASE_VALUES_THRESHOLD;
9862 /* Attempt to generate a casesi instruction. Returns 1 if successful,
9863 0 otherwise (i.e. if there is no casesi instruction). */
9865 try_casesi (tree index_type, tree index_expr, tree minval, tree range,
9866 rtx table_label ATTRIBUTE_UNUSED, rtx default_label)
9868 enum machine_mode index_mode = SImode;
9869 int index_bits = GET_MODE_BITSIZE (index_mode);
9870 rtx op1, op2, index;
9871 enum machine_mode op_mode;
9876 /* Convert the index to SImode. */
9877 if (GET_MODE_BITSIZE (TYPE_MODE (index_type)) > GET_MODE_BITSIZE (index_mode))
9879 enum machine_mode omode = TYPE_MODE (index_type);
9880 rtx rangertx = expand_normal (range);
9882 /* We must handle the endpoints in the original mode. */
9883 index_expr = build2 (MINUS_EXPR, index_type,
9884 index_expr, minval);
9885 minval = integer_zero_node;
9886 index = expand_normal (index_expr);
9887 emit_cmp_and_jump_insns (rangertx, index, LTU, NULL_RTX,
9888 omode, 1, default_label);
9889 /* Now we can safely truncate. */
9890 index = convert_to_mode (index_mode, index, 0);
9894 if (TYPE_MODE (index_type) != index_mode)
9896 index_type = lang_hooks.types.type_for_size (index_bits, 0);
9897 index_expr = fold_convert (index_type, index_expr);
9900 index = expand_normal (index_expr);
9903 do_pending_stack_adjust ();
9905 op_mode = insn_data[(int) CODE_FOR_casesi].operand[0].mode;
9906 if (! (*insn_data[(int) CODE_FOR_casesi].operand[0].predicate)
9908 index = copy_to_mode_reg (op_mode, index);
9910 op1 = expand_normal (minval);
9912 op_mode = insn_data[(int) CODE_FOR_casesi].operand[1].mode;
9913 op1 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (minval)),
9914 op1, TYPE_UNSIGNED (TREE_TYPE (minval)));
9915 if (! (*insn_data[(int) CODE_FOR_casesi].operand[1].predicate)
9917 op1 = copy_to_mode_reg (op_mode, op1);
9919 op2 = expand_normal (range);
9921 op_mode = insn_data[(int) CODE_FOR_casesi].operand[2].mode;
9922 op2 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (range)),
9923 op2, TYPE_UNSIGNED (TREE_TYPE (range)));
9924 if (! (*insn_data[(int) CODE_FOR_casesi].operand[2].predicate)
9926 op2 = copy_to_mode_reg (op_mode, op2);
9928 emit_jump_insn (gen_casesi (index, op1, op2,
9929 table_label, default_label));
9933 /* Attempt to generate a tablejump instruction; same concept. */
9934 #ifndef HAVE_tablejump
9935 #define HAVE_tablejump 0
9936 #define gen_tablejump(x, y) (0)
9939 /* Subroutine of the next function.
9941 INDEX is the value being switched on, with the lowest value
9942 in the table already subtracted.
9943 MODE is its expected mode (needed if INDEX is constant).
9944 RANGE is the length of the jump table.
9945 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
9947 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
9948 index value is out of range. */
9951 do_tablejump (rtx index, enum machine_mode mode, rtx range, rtx table_label,
9956 if (INTVAL (range) > cfun->max_jumptable_ents)
9957 cfun->max_jumptable_ents = INTVAL (range);
9959 /* Do an unsigned comparison (in the proper mode) between the index
9960 expression and the value which represents the length of the range.
9961 Since we just finished subtracting the lower bound of the range
9962 from the index expression, this comparison allows us to simultaneously
9963 check that the original index expression value is both greater than
9964 or equal to the minimum value of the range and less than or equal to
9965 the maximum value of the range. */
9967 emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1,
9970 /* If index is in range, it must fit in Pmode.
9971 Convert to Pmode so we can index with it. */
9973 index = convert_to_mode (Pmode, index, 1);
9975 /* Don't let a MEM slip through, because then INDEX that comes
9976 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
9977 and break_out_memory_refs will go to work on it and mess it up. */
9978 #ifdef PIC_CASE_VECTOR_ADDRESS
9979 if (flag_pic && !REG_P (index))
9980 index = copy_to_mode_reg (Pmode, index);
9983 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
9984 GET_MODE_SIZE, because this indicates how large insns are. The other
9985 uses should all be Pmode, because they are addresses. This code
9986 could fail if addresses and insns are not the same size. */
9987 index = gen_rtx_PLUS (Pmode,
9988 gen_rtx_MULT (Pmode, index,
9989 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
9990 gen_rtx_LABEL_REF (Pmode, table_label));
9991 #ifdef PIC_CASE_VECTOR_ADDRESS
9993 index = PIC_CASE_VECTOR_ADDRESS (index);
9996 index = memory_address (CASE_VECTOR_MODE, index);
9997 temp = gen_reg_rtx (CASE_VECTOR_MODE);
9998 vector = gen_const_mem (CASE_VECTOR_MODE, index);
9999 convert_move (temp, vector, 0);
10001 emit_jump_insn (gen_tablejump (temp, table_label));
10003 /* If we are generating PIC code or if the table is PC-relative, the
10004 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
10005 if (! CASE_VECTOR_PC_RELATIVE && ! flag_pic)
10010 try_tablejump (tree index_type, tree index_expr, tree minval, tree range,
10011 rtx table_label, rtx default_label)
10015 if (! HAVE_tablejump)
10018 index_expr = fold_build2 (MINUS_EXPR, index_type,
10019 fold_convert (index_type, index_expr),
10020 fold_convert (index_type, minval));
10021 index = expand_normal (index_expr);
10022 do_pending_stack_adjust ();
10024 do_tablejump (index, TYPE_MODE (index_type),
10025 convert_modes (TYPE_MODE (index_type),
10026 TYPE_MODE (TREE_TYPE (range)),
10027 expand_normal (range),
10028 TYPE_UNSIGNED (TREE_TYPE (range))),
10029 table_label, default_label);
10033 /* Nonzero if the mode is a valid vector mode for this architecture.
10034 This returns nonzero even if there is no hardware support for the
10035 vector mode, but we can emulate with narrower modes. */
10038 vector_mode_valid_p (enum machine_mode mode)
10040 enum mode_class class = GET_MODE_CLASS (mode);
10041 enum machine_mode innermode;
10043 /* Doh! What's going on? */
10044 if (class != MODE_VECTOR_INT
10045 && class != MODE_VECTOR_FLOAT
10046 && class != MODE_VECTOR_FRACT
10047 && class != MODE_VECTOR_UFRACT
10048 && class != MODE_VECTOR_ACCUM
10049 && class != MODE_VECTOR_UACCUM)
10052 /* Hardware support. Woo hoo! */
10053 if (targetm.vector_mode_supported_p (mode))
10056 innermode = GET_MODE_INNER (mode);
10058 /* We should probably return 1 if requesting V4DI and we have no DI,
10059 but we have V2DI, but this is probably very unlikely. */
10061 /* If we have support for the inner mode, we can safely emulate it.
10062 We may not have V2DI, but me can emulate with a pair of DIs. */
10063 return targetm.scalar_mode_supported_p (innermode);
10066 /* Return a CONST_VECTOR rtx for a VECTOR_CST tree. */
10068 const_vector_from_tree (tree exp)
10073 enum machine_mode inner, mode;
10075 mode = TYPE_MODE (TREE_TYPE (exp));
10077 if (initializer_zerop (exp))
10078 return CONST0_RTX (mode);
10080 units = GET_MODE_NUNITS (mode);
10081 inner = GET_MODE_INNER (mode);
10083 v = rtvec_alloc (units);
10085 link = TREE_VECTOR_CST_ELTS (exp);
10086 for (i = 0; link; link = TREE_CHAIN (link), ++i)
10088 elt = TREE_VALUE (link);
10090 if (TREE_CODE (elt) == REAL_CST)
10091 RTVEC_ELT (v, i) = CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (elt),
10093 else if (TREE_CODE (elt) == FIXED_CST)
10094 RTVEC_ELT (v, i) = CONST_FIXED_FROM_FIXED_VALUE (TREE_FIXED_CST (elt),
10097 RTVEC_ELT (v, i) = immed_double_const (TREE_INT_CST_LOW (elt),
10098 TREE_INT_CST_HIGH (elt),
10102 /* Initialize remaining elements to 0. */
10103 for (; i < units; ++i)
10104 RTVEC_ELT (v, i) = CONST0_RTX (inner);
10106 return gen_rtx_CONST_VECTOR (mode, v);
10108 #include "gt-expr.h"