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 Free Software Foundation,
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "coretypes.h"
33 #include "hard-reg-set.h"
36 #include "insn-config.h"
37 #include "insn-attr.h"
38 /* Include expr.h after insn-config.h so we get HAVE_conditional_move. */
45 #include "typeclass.h"
48 #include "langhooks.h"
51 #include "tree-iterator.h"
52 #include "tree-pass.h"
53 #include "tree-flow.h"
57 /* Decide whether a function's arguments should be processed
58 from first to last or from last to first.
60 They should if the stack and args grow in opposite directions, but
61 only if we have push insns. */
65 #ifndef PUSH_ARGS_REVERSED
66 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
67 #define PUSH_ARGS_REVERSED /* If it's last to first. */
73 #ifndef STACK_PUSH_CODE
74 #ifdef STACK_GROWS_DOWNWARD
75 #define STACK_PUSH_CODE PRE_DEC
77 #define STACK_PUSH_CODE PRE_INC
82 /* If this is nonzero, we do not bother generating VOLATILE
83 around volatile memory references, and we are willing to
84 output indirect addresses. If cse is to follow, we reject
85 indirect addresses so a useful potential cse is generated;
86 if it is used only once, instruction combination will produce
87 the same indirect address eventually. */
90 /* This structure is used by move_by_pieces to describe the move to
101 int explicit_inc_from;
102 unsigned HOST_WIDE_INT len;
103 HOST_WIDE_INT offset;
107 /* This structure is used by store_by_pieces to describe the clear to
110 struct store_by_pieces
116 unsigned HOST_WIDE_INT len;
117 HOST_WIDE_INT offset;
118 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode);
123 static unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
126 static void move_by_pieces_1 (rtx (*) (rtx, ...), enum machine_mode,
127 struct move_by_pieces *);
128 static bool block_move_libcall_safe_for_call_parm (void);
129 static bool emit_block_move_via_movmem (rtx, rtx, rtx, unsigned);
130 static rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
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 rtx clear_storage_via_libcall (rtx, rtx, bool);
139 static tree clear_storage_libcall_fn (int);
140 static rtx compress_float_constant (rtx, rtx);
141 static rtx get_subtarget (rtx);
142 static void store_constructor_field (rtx, unsigned HOST_WIDE_INT,
143 HOST_WIDE_INT, enum machine_mode,
144 tree, tree, int, int);
145 static void store_constructor (tree, rtx, int, HOST_WIDE_INT);
146 static rtx store_field (rtx, HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode,
149 static unsigned HOST_WIDE_INT highest_pow2_factor_for_target (tree, tree);
151 static int is_aligning_offset (tree, tree);
152 static void expand_operands (tree, tree, rtx, rtx*, rtx*,
153 enum expand_modifier);
154 static rtx reduce_to_bit_field_precision (rtx, rtx, tree);
155 static rtx do_store_flag (tree, rtx, enum machine_mode, int);
157 static void emit_single_push_insn (enum machine_mode, rtx, tree);
159 static void do_tablejump (rtx, enum machine_mode, rtx, rtx, rtx);
160 static rtx const_vector_from_tree (tree);
161 static void write_complex_part (rtx, rtx, bool);
163 /* Record for each mode whether we can move a register directly to or
164 from an object of that mode in memory. If we can't, we won't try
165 to use that mode directly when accessing a field of that mode. */
167 static char direct_load[NUM_MACHINE_MODES];
168 static char direct_store[NUM_MACHINE_MODES];
170 /* Record for each mode whether we can float-extend from memory. */
172 static bool float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
174 /* This macro is used to determine whether move_by_pieces should be called
175 to perform a structure copy. */
176 #ifndef MOVE_BY_PIECES_P
177 #define MOVE_BY_PIECES_P(SIZE, ALIGN) \
178 (move_by_pieces_ninsns (SIZE, ALIGN, MOVE_MAX_PIECES + 1) \
179 < (unsigned int) MOVE_RATIO)
182 /* This macro is used to determine whether clear_by_pieces should be
183 called to clear storage. */
184 #ifndef CLEAR_BY_PIECES_P
185 #define CLEAR_BY_PIECES_P(SIZE, ALIGN) \
186 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
187 < (unsigned int) CLEAR_RATIO)
190 /* This macro is used to determine whether store_by_pieces should be
191 called to "memset" storage with byte values other than zero, or
192 to "memcpy" storage when the source is a constant string. */
193 #ifndef STORE_BY_PIECES_P
194 #define STORE_BY_PIECES_P(SIZE, ALIGN) \
195 (move_by_pieces_ninsns (SIZE, ALIGN, STORE_MAX_PIECES + 1) \
196 < (unsigned int) MOVE_RATIO)
199 /* This array records the insn_code of insns to perform block moves. */
200 enum insn_code movmem_optab[NUM_MACHINE_MODES];
202 /* This array records the insn_code of insns to perform block sets. */
203 enum insn_code setmem_optab[NUM_MACHINE_MODES];
205 /* These arrays record the insn_code of three different kinds of insns
206 to perform block compares. */
207 enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
208 enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
209 enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
211 /* Synchronization primitives. */
212 enum insn_code sync_add_optab[NUM_MACHINE_MODES];
213 enum insn_code sync_sub_optab[NUM_MACHINE_MODES];
214 enum insn_code sync_ior_optab[NUM_MACHINE_MODES];
215 enum insn_code sync_and_optab[NUM_MACHINE_MODES];
216 enum insn_code sync_xor_optab[NUM_MACHINE_MODES];
217 enum insn_code sync_nand_optab[NUM_MACHINE_MODES];
218 enum insn_code sync_old_add_optab[NUM_MACHINE_MODES];
219 enum insn_code sync_old_sub_optab[NUM_MACHINE_MODES];
220 enum insn_code sync_old_ior_optab[NUM_MACHINE_MODES];
221 enum insn_code sync_old_and_optab[NUM_MACHINE_MODES];
222 enum insn_code sync_old_xor_optab[NUM_MACHINE_MODES];
223 enum insn_code sync_old_nand_optab[NUM_MACHINE_MODES];
224 enum insn_code sync_new_add_optab[NUM_MACHINE_MODES];
225 enum insn_code sync_new_sub_optab[NUM_MACHINE_MODES];
226 enum insn_code sync_new_ior_optab[NUM_MACHINE_MODES];
227 enum insn_code sync_new_and_optab[NUM_MACHINE_MODES];
228 enum insn_code sync_new_xor_optab[NUM_MACHINE_MODES];
229 enum insn_code sync_new_nand_optab[NUM_MACHINE_MODES];
230 enum insn_code sync_compare_and_swap[NUM_MACHINE_MODES];
231 enum insn_code sync_compare_and_swap_cc[NUM_MACHINE_MODES];
232 enum insn_code sync_lock_test_and_set[NUM_MACHINE_MODES];
233 enum insn_code sync_lock_release[NUM_MACHINE_MODES];
235 /* SLOW_UNALIGNED_ACCESS is nonzero if unaligned accesses are very slow. */
237 #ifndef SLOW_UNALIGNED_ACCESS
238 #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) STRICT_ALIGNMENT
241 /* This is run once per compilation to set up which modes can be used
242 directly in memory and to initialize the block move optab. */
245 init_expr_once (void)
248 enum machine_mode mode;
253 /* Try indexing by frame ptr and try by stack ptr.
254 It is known that on the Convex the stack ptr isn't a valid index.
255 With luck, one or the other is valid on any machine. */
256 mem = gen_rtx_MEM (VOIDmode, stack_pointer_rtx);
257 mem1 = gen_rtx_MEM (VOIDmode, frame_pointer_rtx);
259 /* A scratch register we can modify in-place below to avoid
260 useless RTL allocations. */
261 reg = gen_rtx_REG (VOIDmode, -1);
263 insn = rtx_alloc (INSN);
264 pat = gen_rtx_SET (0, NULL_RTX, NULL_RTX);
265 PATTERN (insn) = pat;
267 for (mode = VOIDmode; (int) mode < NUM_MACHINE_MODES;
268 mode = (enum machine_mode) ((int) mode + 1))
272 direct_load[(int) mode] = direct_store[(int) mode] = 0;
273 PUT_MODE (mem, mode);
274 PUT_MODE (mem1, mode);
275 PUT_MODE (reg, mode);
277 /* See if there is some register that can be used in this mode and
278 directly loaded or stored from memory. */
280 if (mode != VOIDmode && mode != BLKmode)
281 for (regno = 0; regno < FIRST_PSEUDO_REGISTER
282 && (direct_load[(int) mode] == 0 || direct_store[(int) mode] == 0);
285 if (! HARD_REGNO_MODE_OK (regno, mode))
291 SET_DEST (pat) = reg;
292 if (recog (pat, insn, &num_clobbers) >= 0)
293 direct_load[(int) mode] = 1;
295 SET_SRC (pat) = mem1;
296 SET_DEST (pat) = reg;
297 if (recog (pat, insn, &num_clobbers) >= 0)
298 direct_load[(int) mode] = 1;
301 SET_DEST (pat) = mem;
302 if (recog (pat, insn, &num_clobbers) >= 0)
303 direct_store[(int) mode] = 1;
306 SET_DEST (pat) = mem1;
307 if (recog (pat, insn, &num_clobbers) >= 0)
308 direct_store[(int) mode] = 1;
312 mem = gen_rtx_MEM (VOIDmode, gen_rtx_raw_REG (Pmode, 10000));
314 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
315 mode = GET_MODE_WIDER_MODE (mode))
317 enum machine_mode srcmode;
318 for (srcmode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); srcmode != mode;
319 srcmode = GET_MODE_WIDER_MODE (srcmode))
323 ic = can_extend_p (mode, srcmode, 0);
324 if (ic == CODE_FOR_nothing)
327 PUT_MODE (mem, srcmode);
329 if ((*insn_data[ic].operand[1].predicate) (mem, srcmode))
330 float_extend_from_mem[mode][srcmode] = true;
335 /* This is run at the start of compiling a function. */
340 cfun->expr = ggc_alloc_cleared (sizeof (struct expr_status));
343 /* Copy data from FROM to TO, where the machine modes are not the same.
344 Both modes may be integer, or both may be floating.
345 UNSIGNEDP should be nonzero if FROM is an unsigned type.
346 This causes zero-extension instead of sign-extension. */
349 convert_move (rtx to, rtx from, int unsignedp)
351 enum machine_mode to_mode = GET_MODE (to);
352 enum machine_mode from_mode = GET_MODE (from);
353 int to_real = SCALAR_FLOAT_MODE_P (to_mode);
354 int from_real = SCALAR_FLOAT_MODE_P (from_mode);
358 /* rtx code for making an equivalent value. */
359 enum rtx_code equiv_code = (unsignedp < 0 ? UNKNOWN
360 : (unsignedp ? ZERO_EXTEND : SIGN_EXTEND));
363 gcc_assert (to_real == from_real);
365 /* If the source and destination are already the same, then there's
370 /* If FROM is a SUBREG that indicates that we have already done at least
371 the required extension, strip it. We don't handle such SUBREGs as
374 if (GET_CODE (from) == SUBREG && SUBREG_PROMOTED_VAR_P (from)
375 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (from)))
376 >= GET_MODE_SIZE (to_mode))
377 && SUBREG_PROMOTED_UNSIGNED_P (from) == unsignedp)
378 from = gen_lowpart (to_mode, from), from_mode = to_mode;
380 gcc_assert (GET_CODE (to) != SUBREG || !SUBREG_PROMOTED_VAR_P (to));
382 if (to_mode == from_mode
383 || (from_mode == VOIDmode && CONSTANT_P (from)))
385 emit_move_insn (to, from);
389 if (VECTOR_MODE_P (to_mode) || VECTOR_MODE_P (from_mode))
391 gcc_assert (GET_MODE_BITSIZE (from_mode) == GET_MODE_BITSIZE (to_mode));
393 if (VECTOR_MODE_P (to_mode))
394 from = simplify_gen_subreg (to_mode, from, GET_MODE (from), 0);
396 to = simplify_gen_subreg (from_mode, to, GET_MODE (to), 0);
398 emit_move_insn (to, from);
402 if (GET_CODE (to) == CONCAT && GET_CODE (from) == CONCAT)
404 convert_move (XEXP (to, 0), XEXP (from, 0), unsignedp);
405 convert_move (XEXP (to, 1), XEXP (from, 1), unsignedp);
414 gcc_assert ((GET_MODE_PRECISION (from_mode)
415 != GET_MODE_PRECISION (to_mode))
416 || (DECIMAL_FLOAT_MODE_P (from_mode)
417 != DECIMAL_FLOAT_MODE_P (to_mode)));
419 if (GET_MODE_PRECISION (from_mode) == GET_MODE_PRECISION (to_mode))
420 /* Conversion between decimal float and binary float, same size. */
421 tab = DECIMAL_FLOAT_MODE_P (from_mode) ? trunc_optab : sext_optab;
422 else if (GET_MODE_PRECISION (from_mode) < GET_MODE_PRECISION (to_mode))
427 /* Try converting directly if the insn is supported. */
429 code = tab->handlers[to_mode][from_mode].insn_code;
430 if (code != CODE_FOR_nothing)
432 emit_unop_insn (code, to, from,
433 tab == sext_optab ? FLOAT_EXTEND : FLOAT_TRUNCATE);
437 /* Otherwise use a libcall. */
438 libcall = tab->handlers[to_mode][from_mode].libfunc;
440 /* Is this conversion implemented yet? */
441 gcc_assert (libcall);
444 value = emit_library_call_value (libcall, NULL_RTX, LCT_CONST, to_mode,
446 insns = get_insns ();
448 emit_libcall_block (insns, to, value,
449 tab == trunc_optab ? gen_rtx_FLOAT_TRUNCATE (to_mode,
451 : gen_rtx_FLOAT_EXTEND (to_mode, from));
455 /* Handle pointer conversion. */ /* SPEE 900220. */
456 /* Targets are expected to provide conversion insns between PxImode and
457 xImode for all MODE_PARTIAL_INT modes they use, but no others. */
458 if (GET_MODE_CLASS (to_mode) == MODE_PARTIAL_INT)
460 enum machine_mode full_mode
461 = smallest_mode_for_size (GET_MODE_BITSIZE (to_mode), MODE_INT);
463 gcc_assert (trunc_optab->handlers[to_mode][full_mode].insn_code
464 != CODE_FOR_nothing);
466 if (full_mode != from_mode)
467 from = convert_to_mode (full_mode, from, unsignedp);
468 emit_unop_insn (trunc_optab->handlers[to_mode][full_mode].insn_code,
472 if (GET_MODE_CLASS (from_mode) == MODE_PARTIAL_INT)
475 enum machine_mode full_mode
476 = smallest_mode_for_size (GET_MODE_BITSIZE (from_mode), MODE_INT);
478 gcc_assert (sext_optab->handlers[full_mode][from_mode].insn_code
479 != CODE_FOR_nothing);
481 if (to_mode == full_mode)
483 emit_unop_insn (sext_optab->handlers[full_mode][from_mode].insn_code,
488 new_from = gen_reg_rtx (full_mode);
489 emit_unop_insn (sext_optab->handlers[full_mode][from_mode].insn_code,
490 new_from, from, UNKNOWN);
492 /* else proceed to integer conversions below. */
493 from_mode = full_mode;
497 /* Now both modes are integers. */
499 /* Handle expanding beyond a word. */
500 if (GET_MODE_BITSIZE (from_mode) < GET_MODE_BITSIZE (to_mode)
501 && GET_MODE_BITSIZE (to_mode) > BITS_PER_WORD)
508 enum machine_mode lowpart_mode;
509 int nwords = CEIL (GET_MODE_SIZE (to_mode), UNITS_PER_WORD);
511 /* Try converting directly if the insn is supported. */
512 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
515 /* If FROM is a SUBREG, put it into a register. Do this
516 so that we always generate the same set of insns for
517 better cse'ing; if an intermediate assignment occurred,
518 we won't be doing the operation directly on the SUBREG. */
519 if (optimize > 0 && GET_CODE (from) == SUBREG)
520 from = force_reg (from_mode, from);
521 emit_unop_insn (code, to, from, equiv_code);
524 /* Next, try converting via full word. */
525 else if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD
526 && ((code = can_extend_p (to_mode, word_mode, unsignedp))
527 != CODE_FOR_nothing))
531 if (reg_overlap_mentioned_p (to, from))
532 from = force_reg (from_mode, from);
533 emit_insn (gen_rtx_CLOBBER (VOIDmode, to));
535 convert_move (gen_lowpart (word_mode, to), from, unsignedp);
536 emit_unop_insn (code, to,
537 gen_lowpart (word_mode, to), equiv_code);
541 /* No special multiword conversion insn; do it by hand. */
544 /* Since we will turn this into a no conflict block, we must ensure
545 that the source does not overlap the target. */
547 if (reg_overlap_mentioned_p (to, from))
548 from = force_reg (from_mode, from);
550 /* Get a copy of FROM widened to a word, if necessary. */
551 if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
552 lowpart_mode = word_mode;
554 lowpart_mode = from_mode;
556 lowfrom = convert_to_mode (lowpart_mode, from, unsignedp);
558 lowpart = gen_lowpart (lowpart_mode, to);
559 emit_move_insn (lowpart, lowfrom);
561 /* Compute the value to put in each remaining word. */
563 fill_value = const0_rtx;
568 && insn_data[(int) CODE_FOR_slt].operand[0].mode == word_mode
569 && STORE_FLAG_VALUE == -1)
571 emit_cmp_insn (lowfrom, const0_rtx, NE, NULL_RTX,
573 fill_value = gen_reg_rtx (word_mode);
574 emit_insn (gen_slt (fill_value));
580 = expand_shift (RSHIFT_EXPR, lowpart_mode, lowfrom,
581 size_int (GET_MODE_BITSIZE (lowpart_mode) - 1),
583 fill_value = convert_to_mode (word_mode, fill_value, 1);
587 /* Fill the remaining words. */
588 for (i = GET_MODE_SIZE (lowpart_mode) / UNITS_PER_WORD; i < nwords; i++)
590 int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
591 rtx subword = operand_subword (to, index, 1, to_mode);
593 gcc_assert (subword);
595 if (fill_value != subword)
596 emit_move_insn (subword, fill_value);
599 insns = get_insns ();
602 emit_no_conflict_block (insns, to, from, NULL_RTX,
603 gen_rtx_fmt_e (equiv_code, to_mode, copy_rtx (from)));
607 /* Truncating multi-word to a word or less. */
608 if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
609 && GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
612 && ! MEM_VOLATILE_P (from)
613 && direct_load[(int) to_mode]
614 && ! mode_dependent_address_p (XEXP (from, 0)))
616 || GET_CODE (from) == SUBREG))
617 from = force_reg (from_mode, from);
618 convert_move (to, gen_lowpart (word_mode, from), 0);
622 /* Now follow all the conversions between integers
623 no more than a word long. */
625 /* For truncation, usually we can just refer to FROM in a narrower mode. */
626 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
627 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
628 GET_MODE_BITSIZE (from_mode)))
631 && ! MEM_VOLATILE_P (from)
632 && direct_load[(int) to_mode]
633 && ! mode_dependent_address_p (XEXP (from, 0)))
635 || GET_CODE (from) == SUBREG))
636 from = force_reg (from_mode, from);
637 if (REG_P (from) && REGNO (from) < FIRST_PSEUDO_REGISTER
638 && ! HARD_REGNO_MODE_OK (REGNO (from), to_mode))
639 from = copy_to_reg (from);
640 emit_move_insn (to, gen_lowpart (to_mode, from));
644 /* Handle extension. */
645 if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
647 /* Convert directly if that works. */
648 if ((code = can_extend_p (to_mode, from_mode, unsignedp))
651 emit_unop_insn (code, to, from, equiv_code);
656 enum machine_mode intermediate;
660 /* Search for a mode to convert via. */
661 for (intermediate = from_mode; intermediate != VOIDmode;
662 intermediate = GET_MODE_WIDER_MODE (intermediate))
663 if (((can_extend_p (to_mode, intermediate, unsignedp)
665 || (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (intermediate)
666 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
667 GET_MODE_BITSIZE (intermediate))))
668 && (can_extend_p (intermediate, from_mode, unsignedp)
669 != CODE_FOR_nothing))
671 convert_move (to, convert_to_mode (intermediate, from,
672 unsignedp), unsignedp);
676 /* No suitable intermediate mode.
677 Generate what we need with shifts. */
678 shift_amount = build_int_cst (NULL_TREE,
679 GET_MODE_BITSIZE (to_mode)
680 - GET_MODE_BITSIZE (from_mode));
681 from = gen_lowpart (to_mode, force_reg (from_mode, from));
682 tmp = expand_shift (LSHIFT_EXPR, to_mode, from, shift_amount,
684 tmp = expand_shift (RSHIFT_EXPR, to_mode, tmp, shift_amount,
687 emit_move_insn (to, tmp);
692 /* Support special truncate insns for certain modes. */
693 if (trunc_optab->handlers[to_mode][from_mode].insn_code != CODE_FOR_nothing)
695 emit_unop_insn (trunc_optab->handlers[to_mode][from_mode].insn_code,
700 /* Handle truncation of volatile memrefs, and so on;
701 the things that couldn't be truncated directly,
702 and for which there was no special instruction.
704 ??? Code above formerly short-circuited this, for most integer
705 mode pairs, with a force_reg in from_mode followed by a recursive
706 call to this routine. Appears always to have been wrong. */
707 if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode))
709 rtx temp = force_reg (to_mode, gen_lowpart (to_mode, from));
710 emit_move_insn (to, temp);
714 /* Mode combination is not recognized. */
718 /* Return an rtx for a value that would result
719 from converting X to mode MODE.
720 Both X and MODE may be floating, or both integer.
721 UNSIGNEDP is nonzero if X is an unsigned value.
722 This can be done by referring to a part of X in place
723 or by copying to a new temporary with conversion. */
726 convert_to_mode (enum machine_mode mode, rtx x, int unsignedp)
728 return convert_modes (mode, VOIDmode, x, unsignedp);
731 /* Return an rtx for a value that would result
732 from converting X from mode OLDMODE to mode MODE.
733 Both modes may be floating, or both integer.
734 UNSIGNEDP is nonzero if X is an unsigned value.
736 This can be done by referring to a part of X in place
737 or by copying to a new temporary with conversion.
739 You can give VOIDmode for OLDMODE, if you are sure X has a nonvoid mode. */
742 convert_modes (enum machine_mode mode, enum machine_mode oldmode, rtx x, int unsignedp)
746 /* If FROM is a SUBREG that indicates that we have already done at least
747 the required extension, strip it. */
749 if (GET_CODE (x) == SUBREG && SUBREG_PROMOTED_VAR_P (x)
750 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) >= GET_MODE_SIZE (mode)
751 && SUBREG_PROMOTED_UNSIGNED_P (x) == unsignedp)
752 x = gen_lowpart (mode, x);
754 if (GET_MODE (x) != VOIDmode)
755 oldmode = GET_MODE (x);
760 /* There is one case that we must handle specially: If we are converting
761 a CONST_INT into a mode whose size is twice HOST_BITS_PER_WIDE_INT and
762 we are to interpret the constant as unsigned, gen_lowpart will do
763 the wrong if the constant appears negative. What we want to do is
764 make the high-order word of the constant zero, not all ones. */
766 if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
767 && GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
768 && GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
770 HOST_WIDE_INT val = INTVAL (x);
772 if (oldmode != VOIDmode
773 && HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
775 int width = GET_MODE_BITSIZE (oldmode);
777 /* We need to zero extend VAL. */
778 val &= ((HOST_WIDE_INT) 1 << width) - 1;
781 return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
784 /* We can do this with a gen_lowpart if both desired and current modes
785 are integer, and this is either a constant integer, a register, or a
786 non-volatile MEM. Except for the constant case where MODE is no
787 wider than HOST_BITS_PER_WIDE_INT, we must be narrowing the operand. */
789 if ((GET_CODE (x) == CONST_INT
790 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
791 || (GET_MODE_CLASS (mode) == MODE_INT
792 && GET_MODE_CLASS (oldmode) == MODE_INT
793 && (GET_CODE (x) == CONST_DOUBLE
794 || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
795 && ((MEM_P (x) && ! MEM_VOLATILE_P (x)
796 && direct_load[(int) mode])
798 && (! HARD_REGISTER_P (x)
799 || HARD_REGNO_MODE_OK (REGNO (x), mode))
800 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
801 GET_MODE_BITSIZE (GET_MODE (x)))))))))
803 /* ?? If we don't know OLDMODE, we have to assume here that
804 X does not need sign- or zero-extension. This may not be
805 the case, but it's the best we can do. */
806 if (GET_CODE (x) == CONST_INT && oldmode != VOIDmode
807 && GET_MODE_SIZE (mode) > GET_MODE_SIZE (oldmode))
809 HOST_WIDE_INT val = INTVAL (x);
810 int width = GET_MODE_BITSIZE (oldmode);
812 /* We must sign or zero-extend in this case. Start by
813 zero-extending, then sign extend if we need to. */
814 val &= ((HOST_WIDE_INT) 1 << width) - 1;
816 && (val & ((HOST_WIDE_INT) 1 << (width - 1))))
817 val |= (HOST_WIDE_INT) (-1) << width;
819 return gen_int_mode (val, mode);
822 return gen_lowpart (mode, x);
825 /* Converting from integer constant into mode is always equivalent to an
827 if (VECTOR_MODE_P (mode) && GET_MODE (x) == VOIDmode)
829 gcc_assert (GET_MODE_BITSIZE (mode) == GET_MODE_BITSIZE (oldmode));
830 return simplify_gen_subreg (mode, x, oldmode, 0);
833 temp = gen_reg_rtx (mode);
834 convert_move (temp, x, unsignedp);
838 /* STORE_MAX_PIECES is the number of bytes at a time that we can
839 store efficiently. Due to internal GCC limitations, this is
840 MOVE_MAX_PIECES limited by the number of bytes GCC can represent
841 for an immediate constant. */
843 #define STORE_MAX_PIECES MIN (MOVE_MAX_PIECES, 2 * sizeof (HOST_WIDE_INT))
845 /* Determine whether the LEN bytes can be moved by using several move
846 instructions. Return nonzero if a call to move_by_pieces should
850 can_move_by_pieces (unsigned HOST_WIDE_INT len,
851 unsigned int align ATTRIBUTE_UNUSED)
853 return MOVE_BY_PIECES_P (len, align);
856 /* Generate several move instructions to copy LEN bytes from block FROM to
857 block TO. (These are MEM rtx's with BLKmode).
859 If PUSH_ROUNDING is defined and TO is NULL, emit_single_push_insn is
860 used to push FROM to the stack.
862 ALIGN is maximum stack alignment we can assume.
864 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
865 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
869 move_by_pieces (rtx to, rtx from, unsigned HOST_WIDE_INT len,
870 unsigned int align, int endp)
872 struct move_by_pieces data;
873 rtx to_addr, from_addr = XEXP (from, 0);
874 unsigned int max_size = MOVE_MAX_PIECES + 1;
875 enum machine_mode mode = VOIDmode, tmode;
876 enum insn_code icode;
878 align = MIN (to ? MEM_ALIGN (to) : align, MEM_ALIGN (from));
881 data.from_addr = from_addr;
884 to_addr = XEXP (to, 0);
887 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
888 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
890 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
897 #ifdef STACK_GROWS_DOWNWARD
903 data.to_addr = to_addr;
906 = (GET_CODE (from_addr) == PRE_INC || GET_CODE (from_addr) == PRE_DEC
907 || GET_CODE (from_addr) == POST_INC
908 || GET_CODE (from_addr) == POST_DEC);
910 data.explicit_inc_from = 0;
911 data.explicit_inc_to = 0;
912 if (data.reverse) data.offset = len;
915 /* If copying requires more than two move insns,
916 copy addresses to registers (to make displacements shorter)
917 and use post-increment if available. */
918 if (!(data.autinc_from && data.autinc_to)
919 && move_by_pieces_ninsns (len, align, max_size) > 2)
921 /* Find the mode of the largest move... */
922 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
923 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
924 if (GET_MODE_SIZE (tmode) < max_size)
927 if (USE_LOAD_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_from)
929 data.from_addr = copy_addr_to_reg (plus_constant (from_addr, len));
930 data.autinc_from = 1;
931 data.explicit_inc_from = -1;
933 if (USE_LOAD_POST_INCREMENT (mode) && ! data.autinc_from)
935 data.from_addr = copy_addr_to_reg (from_addr);
936 data.autinc_from = 1;
937 data.explicit_inc_from = 1;
939 if (!data.autinc_from && CONSTANT_P (from_addr))
940 data.from_addr = copy_addr_to_reg (from_addr);
941 if (USE_STORE_PRE_DECREMENT (mode) && data.reverse && ! data.autinc_to)
943 data.to_addr = copy_addr_to_reg (plus_constant (to_addr, len));
945 data.explicit_inc_to = -1;
947 if (USE_STORE_POST_INCREMENT (mode) && ! data.reverse && ! data.autinc_to)
949 data.to_addr = copy_addr_to_reg (to_addr);
951 data.explicit_inc_to = 1;
953 if (!data.autinc_to && CONSTANT_P (to_addr))
954 data.to_addr = copy_addr_to_reg (to_addr);
957 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
958 if (align >= GET_MODE_ALIGNMENT (tmode))
959 align = GET_MODE_ALIGNMENT (tmode);
962 enum machine_mode xmode;
964 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
966 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
967 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
968 || SLOW_UNALIGNED_ACCESS (tmode, align))
971 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
974 /* First move what we can in the largest integer mode, then go to
975 successively smaller modes. */
979 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
980 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
981 if (GET_MODE_SIZE (tmode) < max_size)
984 if (mode == VOIDmode)
987 icode = mov_optab->handlers[(int) mode].insn_code;
988 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
989 move_by_pieces_1 (GEN_FCN (icode), mode, &data);
991 max_size = GET_MODE_SIZE (mode);
994 /* The code above should have handled everything. */
995 gcc_assert (!data.len);
1001 gcc_assert (!data.reverse);
1006 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
1007 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
1009 data.to_addr = copy_addr_to_reg (plus_constant (data.to_addr,
1012 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
1019 to1 = adjust_address (data.to, QImode, data.offset);
1027 /* Return number of insns required to move L bytes by pieces.
1028 ALIGN (in bits) is maximum alignment we can assume. */
1030 static unsigned HOST_WIDE_INT
1031 move_by_pieces_ninsns (unsigned HOST_WIDE_INT l, unsigned int align,
1032 unsigned int max_size)
1034 unsigned HOST_WIDE_INT n_insns = 0;
1035 enum machine_mode tmode;
1037 tmode = mode_for_size (MOVE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
1038 if (align >= GET_MODE_ALIGNMENT (tmode))
1039 align = GET_MODE_ALIGNMENT (tmode);
1042 enum machine_mode tmode, xmode;
1044 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
1046 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
1047 if (GET_MODE_SIZE (tmode) > MOVE_MAX_PIECES
1048 || SLOW_UNALIGNED_ACCESS (tmode, align))
1051 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
1054 while (max_size > 1)
1056 enum machine_mode mode = VOIDmode;
1057 enum insn_code icode;
1059 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
1060 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
1061 if (GET_MODE_SIZE (tmode) < max_size)
1064 if (mode == VOIDmode)
1067 icode = mov_optab->handlers[(int) mode].insn_code;
1068 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
1069 n_insns += l / GET_MODE_SIZE (mode), l %= GET_MODE_SIZE (mode);
1071 max_size = GET_MODE_SIZE (mode);
1078 /* Subroutine of move_by_pieces. Move as many bytes as appropriate
1079 with move instructions for mode MODE. GENFUN is the gen_... function
1080 to make a move insn for that mode. DATA has all the other info. */
1083 move_by_pieces_1 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
1084 struct move_by_pieces *data)
1086 unsigned int size = GET_MODE_SIZE (mode);
1087 rtx to1 = NULL_RTX, from1;
1089 while (data->len >= size)
1092 data->offset -= size;
1096 if (data->autinc_to)
1097 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
1100 to1 = adjust_address (data->to, mode, data->offset);
1103 if (data->autinc_from)
1104 from1 = adjust_automodify_address (data->from, mode, data->from_addr,
1107 from1 = adjust_address (data->from, mode, data->offset);
1109 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
1110 emit_insn (gen_add2_insn (data->to_addr,
1111 GEN_INT (-(HOST_WIDE_INT)size)));
1112 if (HAVE_PRE_DECREMENT && data->explicit_inc_from < 0)
1113 emit_insn (gen_add2_insn (data->from_addr,
1114 GEN_INT (-(HOST_WIDE_INT)size)));
1117 emit_insn ((*genfun) (to1, from1));
1120 #ifdef PUSH_ROUNDING
1121 emit_single_push_insn (mode, from1, NULL);
1127 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
1128 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
1129 if (HAVE_POST_INCREMENT && data->explicit_inc_from > 0)
1130 emit_insn (gen_add2_insn (data->from_addr, GEN_INT (size)));
1132 if (! data->reverse)
1133 data->offset += size;
1139 /* Emit code to move a block Y to a block X. This may be done with
1140 string-move instructions, with multiple scalar move instructions,
1141 or with a library call.
1143 Both X and Y must be MEM rtx's (perhaps inside VOLATILE) with mode BLKmode.
1144 SIZE is an rtx that says how long they are.
1145 ALIGN is the maximum alignment we can assume they have.
1146 METHOD describes what kind of copy this is, and what mechanisms may be used.
1148 Return the address of the new block, if memcpy is called and returns it,
1152 emit_block_move (rtx x, rtx y, rtx size, enum block_op_methods method)
1160 case BLOCK_OP_NORMAL:
1161 case BLOCK_OP_TAILCALL:
1162 may_use_call = true;
1165 case BLOCK_OP_CALL_PARM:
1166 may_use_call = block_move_libcall_safe_for_call_parm ();
1168 /* Make inhibit_defer_pop nonzero around the library call
1169 to force it to pop the arguments right away. */
1173 case BLOCK_OP_NO_LIBCALL:
1174 may_use_call = false;
1181 align = MIN (MEM_ALIGN (x), MEM_ALIGN (y));
1183 gcc_assert (MEM_P (x));
1184 gcc_assert (MEM_P (y));
1187 /* Make sure we've got BLKmode addresses; store_one_arg can decide that
1188 block copy is more efficient for other large modes, e.g. DCmode. */
1189 x = adjust_address (x, BLKmode, 0);
1190 y = adjust_address (y, BLKmode, 0);
1192 /* Set MEM_SIZE as appropriate for this block copy. The main place this
1193 can be incorrect is coming from __builtin_memcpy. */
1194 if (GET_CODE (size) == CONST_INT)
1196 if (INTVAL (size) == 0)
1199 x = shallow_copy_rtx (x);
1200 y = shallow_copy_rtx (y);
1201 set_mem_size (x, size);
1202 set_mem_size (y, size);
1205 if (GET_CODE (size) == CONST_INT && MOVE_BY_PIECES_P (INTVAL (size), align))
1206 move_by_pieces (x, y, INTVAL (size), align, 0);
1207 else if (emit_block_move_via_movmem (x, y, size, align))
1209 else if (may_use_call)
1210 retval = emit_block_move_via_libcall (x, y, size,
1211 method == BLOCK_OP_TAILCALL);
1213 emit_block_move_via_loop (x, y, size, align);
1215 if (method == BLOCK_OP_CALL_PARM)
1221 /* A subroutine of emit_block_move. Returns true if calling the
1222 block move libcall will not clobber any parameters which may have
1223 already been placed on the stack. */
1226 block_move_libcall_safe_for_call_parm (void)
1228 /* If arguments are pushed on the stack, then they're safe. */
1232 /* If registers go on the stack anyway, any argument is sure to clobber
1233 an outgoing argument. */
1234 #if defined (REG_PARM_STACK_SPACE) && defined (OUTGOING_REG_PARM_STACK_SPACE)
1236 tree fn = emit_block_move_libcall_fn (false);
1238 if (REG_PARM_STACK_SPACE (fn) != 0)
1243 /* If any argument goes in memory, then it might clobber an outgoing
1246 CUMULATIVE_ARGS args_so_far;
1249 fn = emit_block_move_libcall_fn (false);
1250 INIT_CUMULATIVE_ARGS (args_so_far, TREE_TYPE (fn), NULL_RTX, 0, 3);
1252 arg = TYPE_ARG_TYPES (TREE_TYPE (fn));
1253 for ( ; arg != void_list_node ; arg = TREE_CHAIN (arg))
1255 enum machine_mode mode = TYPE_MODE (TREE_VALUE (arg));
1256 rtx tmp = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
1257 if (!tmp || !REG_P (tmp))
1259 if (targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL, 1))
1261 FUNCTION_ARG_ADVANCE (args_so_far, mode, NULL_TREE, 1);
1267 /* A subroutine of emit_block_move. Expand a movmem pattern;
1268 return true if successful. */
1271 emit_block_move_via_movmem (rtx x, rtx y, rtx size, unsigned int align)
1273 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
1274 int save_volatile_ok = volatile_ok;
1275 enum machine_mode mode;
1277 /* Since this is a move insn, we don't care about volatility. */
1280 /* Try the most limited insn first, because there's no point
1281 including more than one in the machine description unless
1282 the more limited one has some advantage. */
1284 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
1285 mode = GET_MODE_WIDER_MODE (mode))
1287 enum insn_code code = movmem_optab[(int) mode];
1288 insn_operand_predicate_fn pred;
1290 if (code != CODE_FOR_nothing
1291 /* We don't need MODE to be narrower than BITS_PER_HOST_WIDE_INT
1292 here because if SIZE is less than the mode mask, as it is
1293 returned by the macro, it will definitely be less than the
1294 actual mode mask. */
1295 && ((GET_CODE (size) == CONST_INT
1296 && ((unsigned HOST_WIDE_INT) INTVAL (size)
1297 <= (GET_MODE_MASK (mode) >> 1)))
1298 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
1299 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
1300 || (*pred) (x, BLKmode))
1301 && ((pred = insn_data[(int) code].operand[1].predicate) == 0
1302 || (*pred) (y, BLKmode))
1303 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
1304 || (*pred) (opalign, VOIDmode)))
1307 rtx last = get_last_insn ();
1310 op2 = convert_to_mode (mode, size, 1);
1311 pred = insn_data[(int) code].operand[2].predicate;
1312 if (pred != 0 && ! (*pred) (op2, mode))
1313 op2 = copy_to_mode_reg (mode, op2);
1315 /* ??? When called via emit_block_move_for_call, it'd be
1316 nice if there were some way to inform the backend, so
1317 that it doesn't fail the expansion because it thinks
1318 emitting the libcall would be more efficient. */
1320 pat = GEN_FCN ((int) code) (x, y, op2, opalign);
1324 volatile_ok = save_volatile_ok;
1328 delete_insns_since (last);
1332 volatile_ok = save_volatile_ok;
1336 /* A subroutine of emit_block_move. Expand a call to memcpy.
1337 Return the return value from memcpy, 0 otherwise. */
1340 emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall)
1342 rtx dst_addr, src_addr;
1343 tree call_expr, arg_list, fn, src_tree, dst_tree, size_tree;
1344 enum machine_mode size_mode;
1347 /* Emit code to copy the addresses of DST and SRC and SIZE into new
1348 pseudos. We can then place those new pseudos into a VAR_DECL and
1351 dst_addr = copy_to_mode_reg (Pmode, XEXP (dst, 0));
1352 src_addr = copy_to_mode_reg (Pmode, XEXP (src, 0));
1354 dst_addr = convert_memory_address (ptr_mode, dst_addr);
1355 src_addr = convert_memory_address (ptr_mode, src_addr);
1357 dst_tree = make_tree (ptr_type_node, dst_addr);
1358 src_tree = make_tree (ptr_type_node, src_addr);
1360 size_mode = TYPE_MODE (sizetype);
1362 size = convert_to_mode (size_mode, size, 1);
1363 size = copy_to_mode_reg (size_mode, size);
1365 /* It is incorrect to use the libcall calling conventions to call
1366 memcpy in this context. This could be a user call to memcpy and
1367 the user may wish to examine the return value from memcpy. For
1368 targets where libcalls and normal calls have different conventions
1369 for returning pointers, we could end up generating incorrect code. */
1371 size_tree = make_tree (sizetype, size);
1373 fn = emit_block_move_libcall_fn (true);
1374 arg_list = tree_cons (NULL_TREE, size_tree, NULL_TREE);
1375 arg_list = tree_cons (NULL_TREE, src_tree, arg_list);
1376 arg_list = tree_cons (NULL_TREE, dst_tree, arg_list);
1378 /* Now we have to build up the CALL_EXPR itself. */
1379 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
1380 call_expr = build3 (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
1381 call_expr, arg_list, NULL_TREE);
1382 CALL_EXPR_TAILCALL (call_expr) = tailcall;
1384 retval = expand_normal (call_expr);
1389 /* A subroutine of emit_block_move_via_libcall. Create the tree node
1390 for the function we use for block copies. The first time FOR_CALL
1391 is true, we call assemble_external. */
1393 static GTY(()) tree block_move_fn;
1396 init_block_move_fn (const char *asmspec)
1402 fn = get_identifier ("memcpy");
1403 args = build_function_type_list (ptr_type_node, ptr_type_node,
1404 const_ptr_type_node, sizetype,
1407 fn = build_decl (FUNCTION_DECL, fn, args);
1408 DECL_EXTERNAL (fn) = 1;
1409 TREE_PUBLIC (fn) = 1;
1410 DECL_ARTIFICIAL (fn) = 1;
1411 TREE_NOTHROW (fn) = 1;
1412 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
1413 DECL_VISIBILITY_SPECIFIED (fn) = 1;
1419 set_user_assembler_name (block_move_fn, asmspec);
1423 emit_block_move_libcall_fn (int for_call)
1425 static bool emitted_extern;
1428 init_block_move_fn (NULL);
1430 if (for_call && !emitted_extern)
1432 emitted_extern = true;
1433 make_decl_rtl (block_move_fn);
1434 assemble_external (block_move_fn);
1437 return block_move_fn;
1440 /* A subroutine of emit_block_move. Copy the data via an explicit
1441 loop. This is used only when libcalls are forbidden. */
1442 /* ??? It'd be nice to copy in hunks larger than QImode. */
1445 emit_block_move_via_loop (rtx x, rtx y, rtx size,
1446 unsigned int align ATTRIBUTE_UNUSED)
1448 rtx cmp_label, top_label, iter, x_addr, y_addr, tmp;
1449 enum machine_mode iter_mode;
1451 iter_mode = GET_MODE (size);
1452 if (iter_mode == VOIDmode)
1453 iter_mode = word_mode;
1455 top_label = gen_label_rtx ();
1456 cmp_label = gen_label_rtx ();
1457 iter = gen_reg_rtx (iter_mode);
1459 emit_move_insn (iter, const0_rtx);
1461 x_addr = force_operand (XEXP (x, 0), NULL_RTX);
1462 y_addr = force_operand (XEXP (y, 0), NULL_RTX);
1463 do_pending_stack_adjust ();
1465 emit_jump (cmp_label);
1466 emit_label (top_label);
1468 tmp = convert_modes (Pmode, iter_mode, iter, true);
1469 x_addr = gen_rtx_PLUS (Pmode, x_addr, tmp);
1470 y_addr = gen_rtx_PLUS (Pmode, y_addr, tmp);
1471 x = change_address (x, QImode, x_addr);
1472 y = change_address (y, QImode, y_addr);
1474 emit_move_insn (x, y);
1476 tmp = expand_simple_binop (iter_mode, PLUS, iter, const1_rtx, iter,
1477 true, OPTAB_LIB_WIDEN);
1479 emit_move_insn (iter, tmp);
1481 emit_label (cmp_label);
1483 emit_cmp_and_jump_insns (iter, size, LT, NULL_RTX, iter_mode,
1487 /* Copy all or part of a value X into registers starting at REGNO.
1488 The number of registers to be filled is NREGS. */
1491 move_block_to_reg (int regno, rtx x, int nregs, enum machine_mode mode)
1494 #ifdef HAVE_load_multiple
1502 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
1503 x = validize_mem (force_const_mem (mode, x));
1505 /* See if the machine can do this with a load multiple insn. */
1506 #ifdef HAVE_load_multiple
1507 if (HAVE_load_multiple)
1509 last = get_last_insn ();
1510 pat = gen_load_multiple (gen_rtx_REG (word_mode, regno), x,
1518 delete_insns_since (last);
1522 for (i = 0; i < nregs; i++)
1523 emit_move_insn (gen_rtx_REG (word_mode, regno + i),
1524 operand_subword_force (x, i, mode));
1527 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
1528 The number of registers to be filled is NREGS. */
1531 move_block_from_reg (int regno, rtx x, int nregs)
1538 /* See if the machine can do this with a store multiple insn. */
1539 #ifdef HAVE_store_multiple
1540 if (HAVE_store_multiple)
1542 rtx last = get_last_insn ();
1543 rtx pat = gen_store_multiple (x, gen_rtx_REG (word_mode, regno),
1551 delete_insns_since (last);
1555 for (i = 0; i < nregs; i++)
1557 rtx tem = operand_subword (x, i, 1, BLKmode);
1561 emit_move_insn (tem, gen_rtx_REG (word_mode, regno + i));
1565 /* Generate a PARALLEL rtx for a new non-consecutive group of registers from
1566 ORIG, where ORIG is a non-consecutive group of registers represented by
1567 a PARALLEL. The clone is identical to the original except in that the
1568 original set of registers is replaced by a new set of pseudo registers.
1569 The new set has the same modes as the original set. */
1572 gen_group_rtx (rtx orig)
1577 gcc_assert (GET_CODE (orig) == PARALLEL);
1579 length = XVECLEN (orig, 0);
1580 tmps = alloca (sizeof (rtx) * length);
1582 /* Skip a NULL entry in first slot. */
1583 i = XEXP (XVECEXP (orig, 0, 0), 0) ? 0 : 1;
1588 for (; i < length; i++)
1590 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (orig, 0, i), 0));
1591 rtx offset = XEXP (XVECEXP (orig, 0, i), 1);
1593 tmps[i] = gen_rtx_EXPR_LIST (VOIDmode, gen_reg_rtx (mode), offset);
1596 return gen_rtx_PARALLEL (GET_MODE (orig), gen_rtvec_v (length, tmps));
1599 /* A subroutine of emit_group_load. Arguments as for emit_group_load,
1600 except that values are placed in TMPS[i], and must later be moved
1601 into corresponding XEXP (XVECEXP (DST, 0, i), 0) element. */
1604 emit_group_load_1 (rtx *tmps, rtx dst, rtx orig_src, tree type, int ssize)
1608 enum machine_mode m = GET_MODE (orig_src);
1610 gcc_assert (GET_CODE (dst) == PARALLEL);
1613 && !SCALAR_INT_MODE_P (m)
1614 && !MEM_P (orig_src)
1615 && GET_CODE (orig_src) != CONCAT)
1617 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_src));
1618 if (imode == BLKmode)
1619 src = assign_stack_temp (GET_MODE (orig_src), ssize, 0);
1621 src = gen_reg_rtx (imode);
1622 if (imode != BLKmode)
1623 src = gen_lowpart (GET_MODE (orig_src), src);
1624 emit_move_insn (src, orig_src);
1625 /* ...and back again. */
1626 if (imode != BLKmode)
1627 src = gen_lowpart (imode, src);
1628 emit_group_load_1 (tmps, dst, src, type, ssize);
1632 /* Check for a NULL entry, used to indicate that the parameter goes
1633 both on the stack and in registers. */
1634 if (XEXP (XVECEXP (dst, 0, 0), 0))
1639 /* Process the pieces. */
1640 for (i = start; i < XVECLEN (dst, 0); i++)
1642 enum machine_mode mode = GET_MODE (XEXP (XVECEXP (dst, 0, i), 0));
1643 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (dst, 0, i), 1));
1644 unsigned int bytelen = GET_MODE_SIZE (mode);
1647 /* Handle trailing fragments that run over the size of the struct. */
1648 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
1650 /* Arrange to shift the fragment to where it belongs.
1651 extract_bit_field loads to the lsb of the reg. */
1653 #ifdef BLOCK_REG_PADDING
1654 BLOCK_REG_PADDING (GET_MODE (orig_src), type, i == start)
1655 == (BYTES_BIG_ENDIAN ? upward : downward)
1660 shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
1661 bytelen = ssize - bytepos;
1662 gcc_assert (bytelen > 0);
1665 /* If we won't be loading directly from memory, protect the real source
1666 from strange tricks we might play; but make sure that the source can
1667 be loaded directly into the destination. */
1669 if (!MEM_P (orig_src)
1670 && (!CONSTANT_P (orig_src)
1671 || (GET_MODE (orig_src) != mode
1672 && GET_MODE (orig_src) != VOIDmode)))
1674 if (GET_MODE (orig_src) == VOIDmode)
1675 src = gen_reg_rtx (mode);
1677 src = gen_reg_rtx (GET_MODE (orig_src));
1679 emit_move_insn (src, orig_src);
1682 /* Optimize the access just a bit. */
1684 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (src))
1685 || MEM_ALIGN (src) >= GET_MODE_ALIGNMENT (mode))
1686 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
1687 && bytelen == GET_MODE_SIZE (mode))
1689 tmps[i] = gen_reg_rtx (mode);
1690 emit_move_insn (tmps[i], adjust_address (src, mode, bytepos));
1692 else if (COMPLEX_MODE_P (mode)
1693 && GET_MODE (src) == mode
1694 && bytelen == GET_MODE_SIZE (mode))
1695 /* Let emit_move_complex do the bulk of the work. */
1697 else if (GET_CODE (src) == CONCAT)
1699 unsigned int slen = GET_MODE_SIZE (GET_MODE (src));
1700 unsigned int slen0 = GET_MODE_SIZE (GET_MODE (XEXP (src, 0)));
1702 if ((bytepos == 0 && bytelen == slen0)
1703 || (bytepos != 0 && bytepos + bytelen <= slen))
1705 /* The following assumes that the concatenated objects all
1706 have the same size. In this case, a simple calculation
1707 can be used to determine the object and the bit field
1709 tmps[i] = XEXP (src, bytepos / slen0);
1710 if (! CONSTANT_P (tmps[i])
1711 && (!REG_P (tmps[i]) || GET_MODE (tmps[i]) != mode))
1712 tmps[i] = extract_bit_field (tmps[i], bytelen * BITS_PER_UNIT,
1713 (bytepos % slen0) * BITS_PER_UNIT,
1714 1, NULL_RTX, mode, mode);
1720 gcc_assert (!bytepos);
1721 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1722 emit_move_insn (mem, src);
1723 tmps[i] = extract_bit_field (mem, bytelen * BITS_PER_UNIT,
1724 0, 1, NULL_RTX, mode, mode);
1727 /* FIXME: A SIMD parallel will eventually lead to a subreg of a
1728 SIMD register, which is currently broken. While we get GCC
1729 to emit proper RTL for these cases, let's dump to memory. */
1730 else if (VECTOR_MODE_P (GET_MODE (dst))
1733 int slen = GET_MODE_SIZE (GET_MODE (src));
1736 mem = assign_stack_temp (GET_MODE (src), slen, 0);
1737 emit_move_insn (mem, src);
1738 tmps[i] = adjust_address (mem, mode, (int) bytepos);
1740 else if (CONSTANT_P (src) && GET_MODE (dst) != BLKmode
1741 && XVECLEN (dst, 0) > 1)
1742 tmps[i] = simplify_gen_subreg (mode, src, GET_MODE(dst), bytepos);
1743 else if (CONSTANT_P (src)
1744 || (REG_P (src) && GET_MODE (src) == mode))
1747 tmps[i] = extract_bit_field (src, bytelen * BITS_PER_UNIT,
1748 bytepos * BITS_PER_UNIT, 1, NULL_RTX,
1752 tmps[i] = expand_shift (LSHIFT_EXPR, mode, tmps[i],
1753 build_int_cst (NULL_TREE, shift), tmps[i], 0);
1757 /* Emit code to move a block SRC of type TYPE to a block DST,
1758 where DST is non-consecutive registers represented by a PARALLEL.
1759 SSIZE represents the total size of block ORIG_SRC in bytes, or -1
1763 emit_group_load (rtx dst, rtx src, tree type, int ssize)
1768 tmps = alloca (sizeof (rtx) * XVECLEN (dst, 0));
1769 emit_group_load_1 (tmps, dst, src, type, ssize);
1771 /* Copy the extracted pieces into the proper (probable) hard regs. */
1772 for (i = 0; i < XVECLEN (dst, 0); i++)
1774 rtx d = XEXP (XVECEXP (dst, 0, i), 0);
1777 emit_move_insn (d, tmps[i]);
1781 /* Similar, but load SRC into new pseudos in a format that looks like
1782 PARALLEL. This can later be fed to emit_group_move to get things
1783 in the right place. */
1786 emit_group_load_into_temps (rtx parallel, rtx src, tree type, int ssize)
1791 vec = rtvec_alloc (XVECLEN (parallel, 0));
1792 emit_group_load_1 (&RTVEC_ELT (vec, 0), parallel, src, type, ssize);
1794 /* Convert the vector to look just like the original PARALLEL, except
1795 with the computed values. */
1796 for (i = 0; i < XVECLEN (parallel, 0); i++)
1798 rtx e = XVECEXP (parallel, 0, i);
1799 rtx d = XEXP (e, 0);
1803 d = force_reg (GET_MODE (d), RTVEC_ELT (vec, i));
1804 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), d, XEXP (e, 1));
1806 RTVEC_ELT (vec, i) = e;
1809 return gen_rtx_PARALLEL (GET_MODE (parallel), vec);
1812 /* Emit code to move a block SRC to block DST, where SRC and DST are
1813 non-consecutive groups of registers, each represented by a PARALLEL. */
1816 emit_group_move (rtx dst, rtx src)
1820 gcc_assert (GET_CODE (src) == PARALLEL
1821 && GET_CODE (dst) == PARALLEL
1822 && XVECLEN (src, 0) == XVECLEN (dst, 0));
1824 /* Skip first entry if NULL. */
1825 for (i = XEXP (XVECEXP (src, 0, 0), 0) ? 0 : 1; i < XVECLEN (src, 0); i++)
1826 emit_move_insn (XEXP (XVECEXP (dst, 0, i), 0),
1827 XEXP (XVECEXP (src, 0, i), 0));
1830 /* Move a group of registers represented by a PARALLEL into pseudos. */
1833 emit_group_move_into_temps (rtx src)
1835 rtvec vec = rtvec_alloc (XVECLEN (src, 0));
1838 for (i = 0; i < XVECLEN (src, 0); i++)
1840 rtx e = XVECEXP (src, 0, i);
1841 rtx d = XEXP (e, 0);
1844 e = alloc_EXPR_LIST (REG_NOTE_KIND (e), copy_to_reg (d), XEXP (e, 1));
1845 RTVEC_ELT (vec, i) = e;
1848 return gen_rtx_PARALLEL (GET_MODE (src), vec);
1851 /* Emit code to move a block SRC to a block ORIG_DST of type TYPE,
1852 where SRC is non-consecutive registers represented by a PARALLEL.
1853 SSIZE represents the total size of block ORIG_DST, or -1 if not
1857 emit_group_store (rtx orig_dst, rtx src, tree type ATTRIBUTE_UNUSED, int ssize)
1860 int start, finish, i;
1861 enum machine_mode m = GET_MODE (orig_dst);
1863 gcc_assert (GET_CODE (src) == PARALLEL);
1865 if (!SCALAR_INT_MODE_P (m)
1866 && !MEM_P (orig_dst) && GET_CODE (orig_dst) != CONCAT)
1868 enum machine_mode imode = int_mode_for_mode (GET_MODE (orig_dst));
1869 if (imode == BLKmode)
1870 dst = assign_stack_temp (GET_MODE (orig_dst), ssize, 0);
1872 dst = gen_reg_rtx (imode);
1873 emit_group_store (dst, src, type, ssize);
1874 if (imode != BLKmode)
1875 dst = gen_lowpart (GET_MODE (orig_dst), dst);
1876 emit_move_insn (orig_dst, dst);
1880 /* Check for a NULL entry, used to indicate that the parameter goes
1881 both on the stack and in registers. */
1882 if (XEXP (XVECEXP (src, 0, 0), 0))
1886 finish = XVECLEN (src, 0);
1888 tmps = alloca (sizeof (rtx) * finish);
1890 /* Copy the (probable) hard regs into pseudos. */
1891 for (i = start; i < finish; i++)
1893 rtx reg = XEXP (XVECEXP (src, 0, i), 0);
1894 if (!REG_P (reg) || REGNO (reg) < FIRST_PSEUDO_REGISTER)
1896 tmps[i] = gen_reg_rtx (GET_MODE (reg));
1897 emit_move_insn (tmps[i], reg);
1903 /* If we won't be storing directly into memory, protect the real destination
1904 from strange tricks we might play. */
1906 if (GET_CODE (dst) == PARALLEL)
1910 /* We can get a PARALLEL dst if there is a conditional expression in
1911 a return statement. In that case, the dst and src are the same,
1912 so no action is necessary. */
1913 if (rtx_equal_p (dst, src))
1916 /* It is unclear if we can ever reach here, but we may as well handle
1917 it. Allocate a temporary, and split this into a store/load to/from
1920 temp = assign_stack_temp (GET_MODE (dst), ssize, 0);
1921 emit_group_store (temp, src, type, ssize);
1922 emit_group_load (dst, temp, type, ssize);
1925 else if (!MEM_P (dst) && GET_CODE (dst) != CONCAT)
1927 enum machine_mode outer = GET_MODE (dst);
1928 enum machine_mode inner;
1929 HOST_WIDE_INT bytepos;
1933 if (!REG_P (dst) || REGNO (dst) < FIRST_PSEUDO_REGISTER)
1934 dst = gen_reg_rtx (outer);
1936 /* Make life a bit easier for combine. */
1937 /* If the first element of the vector is the low part
1938 of the destination mode, use a paradoxical subreg to
1939 initialize the destination. */
1942 inner = GET_MODE (tmps[start]);
1943 bytepos = subreg_lowpart_offset (inner, outer);
1944 if (INTVAL (XEXP (XVECEXP (src, 0, start), 1)) == bytepos)
1946 temp = simplify_gen_subreg (outer, tmps[start],
1950 emit_move_insn (dst, temp);
1957 /* If the first element wasn't the low part, try the last. */
1959 && start < finish - 1)
1961 inner = GET_MODE (tmps[finish - 1]);
1962 bytepos = subreg_lowpart_offset (inner, outer);
1963 if (INTVAL (XEXP (XVECEXP (src, 0, finish - 1), 1)) == bytepos)
1965 temp = simplify_gen_subreg (outer, tmps[finish - 1],
1969 emit_move_insn (dst, temp);
1976 /* Otherwise, simply initialize the result to zero. */
1978 emit_move_insn (dst, CONST0_RTX (outer));
1981 /* Process the pieces. */
1982 for (i = start; i < finish; i++)
1984 HOST_WIDE_INT bytepos = INTVAL (XEXP (XVECEXP (src, 0, i), 1));
1985 enum machine_mode mode = GET_MODE (tmps[i]);
1986 unsigned int bytelen = GET_MODE_SIZE (mode);
1989 /* Handle trailing fragments that run over the size of the struct. */
1990 if (ssize >= 0 && bytepos + (HOST_WIDE_INT) bytelen > ssize)
1992 /* store_bit_field always takes its value from the lsb.
1993 Move the fragment to the lsb if it's not already there. */
1995 #ifdef BLOCK_REG_PADDING
1996 BLOCK_REG_PADDING (GET_MODE (orig_dst), type, i == start)
1997 == (BYTES_BIG_ENDIAN ? upward : downward)
2003 int shift = (bytelen - (ssize - bytepos)) * BITS_PER_UNIT;
2004 tmps[i] = expand_shift (RSHIFT_EXPR, mode, tmps[i],
2005 build_int_cst (NULL_TREE, shift),
2008 bytelen = ssize - bytepos;
2011 if (GET_CODE (dst) == CONCAT)
2013 if (bytepos + bytelen <= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2014 dest = XEXP (dst, 0);
2015 else if (bytepos >= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0))))
2017 bytepos -= GET_MODE_SIZE (GET_MODE (XEXP (dst, 0)));
2018 dest = XEXP (dst, 1);
2022 gcc_assert (bytepos == 0 && XVECLEN (src, 0));
2023 dest = assign_stack_temp (GET_MODE (dest),
2024 GET_MODE_SIZE (GET_MODE (dest)), 0);
2025 emit_move_insn (adjust_address (dest, GET_MODE (tmps[i]), bytepos),
2032 /* Optimize the access just a bit. */
2034 && (! SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (dest))
2035 || MEM_ALIGN (dest) >= GET_MODE_ALIGNMENT (mode))
2036 && bytepos * BITS_PER_UNIT % GET_MODE_ALIGNMENT (mode) == 0
2037 && bytelen == GET_MODE_SIZE (mode))
2038 emit_move_insn (adjust_address (dest, mode, bytepos), tmps[i]);
2040 store_bit_field (dest, bytelen * BITS_PER_UNIT, bytepos * BITS_PER_UNIT,
2044 /* Copy from the pseudo into the (probable) hard reg. */
2045 if (orig_dst != dst)
2046 emit_move_insn (orig_dst, dst);
2049 /* Generate code to copy a BLKmode object of TYPE out of a
2050 set of registers starting with SRCREG into TGTBLK. If TGTBLK
2051 is null, a stack temporary is created. TGTBLK is returned.
2053 The purpose of this routine is to handle functions that return
2054 BLKmode structures in registers. Some machines (the PA for example)
2055 want to return all small structures in registers regardless of the
2056 structure's alignment. */
2059 copy_blkmode_from_reg (rtx tgtblk, rtx srcreg, tree type)
2061 unsigned HOST_WIDE_INT bytes = int_size_in_bytes (type);
2062 rtx src = NULL, dst = NULL;
2063 unsigned HOST_WIDE_INT bitsize = MIN (TYPE_ALIGN (type), BITS_PER_WORD);
2064 unsigned HOST_WIDE_INT bitpos, xbitpos, padding_correction = 0;
2068 tgtblk = assign_temp (build_qualified_type (type,
2070 | TYPE_QUAL_CONST)),
2072 preserve_temp_slots (tgtblk);
2075 /* This code assumes srcreg is at least a full word. If it isn't, copy it
2076 into a new pseudo which is a full word. */
2078 if (GET_MODE (srcreg) != BLKmode
2079 && GET_MODE_SIZE (GET_MODE (srcreg)) < UNITS_PER_WORD)
2080 srcreg = convert_to_mode (word_mode, srcreg, TYPE_UNSIGNED (type));
2082 /* If the structure doesn't take up a whole number of words, see whether
2083 SRCREG is padded on the left or on the right. If it's on the left,
2084 set PADDING_CORRECTION to the number of bits to skip.
2086 In most ABIs, the structure will be returned at the least end of
2087 the register, which translates to right padding on little-endian
2088 targets and left padding on big-endian targets. The opposite
2089 holds if the structure is returned at the most significant
2090 end of the register. */
2091 if (bytes % UNITS_PER_WORD != 0
2092 && (targetm.calls.return_in_msb (type)
2094 : BYTES_BIG_ENDIAN))
2096 = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) * BITS_PER_UNIT));
2098 /* Copy the structure BITSIZE bites at a time.
2100 We could probably emit more efficient code for machines which do not use
2101 strict alignment, but it doesn't seem worth the effort at the current
2103 for (bitpos = 0, xbitpos = padding_correction;
2104 bitpos < bytes * BITS_PER_UNIT;
2105 bitpos += bitsize, xbitpos += bitsize)
2107 /* We need a new source operand each time xbitpos is on a
2108 word boundary and when xbitpos == padding_correction
2109 (the first time through). */
2110 if (xbitpos % BITS_PER_WORD == 0
2111 || xbitpos == padding_correction)
2112 src = operand_subword_force (srcreg, xbitpos / BITS_PER_WORD,
2115 /* We need a new destination operand each time bitpos is on
2117 if (bitpos % BITS_PER_WORD == 0)
2118 dst = operand_subword (tgtblk, bitpos / BITS_PER_WORD, 1, BLKmode);
2120 /* Use xbitpos for the source extraction (right justified) and
2121 xbitpos for the destination store (left justified). */
2122 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode,
2123 extract_bit_field (src, bitsize,
2124 xbitpos % BITS_PER_WORD, 1,
2125 NULL_RTX, word_mode, word_mode));
2131 /* Add a USE expression for REG to the (possibly empty) list pointed
2132 to by CALL_FUSAGE. REG must denote a hard register. */
2135 use_reg (rtx *call_fusage, rtx reg)
2137 gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
2140 = gen_rtx_EXPR_LIST (VOIDmode,
2141 gen_rtx_USE (VOIDmode, reg), *call_fusage);
2144 /* Add USE expressions to *CALL_FUSAGE for each of NREGS consecutive regs,
2145 starting at REGNO. All of these registers must be hard registers. */
2148 use_regs (rtx *call_fusage, int regno, int nregs)
2152 gcc_assert (regno + nregs <= FIRST_PSEUDO_REGISTER);
2154 for (i = 0; i < nregs; i++)
2155 use_reg (call_fusage, regno_reg_rtx[regno + i]);
2158 /* Add USE expressions to *CALL_FUSAGE for each REG contained in the
2159 PARALLEL REGS. This is for calls that pass values in multiple
2160 non-contiguous locations. The Irix 6 ABI has examples of this. */
2163 use_group_regs (rtx *call_fusage, rtx regs)
2167 for (i = 0; i < XVECLEN (regs, 0); i++)
2169 rtx reg = XEXP (XVECEXP (regs, 0, i), 0);
2171 /* A NULL entry means the parameter goes both on the stack and in
2172 registers. This can also be a MEM for targets that pass values
2173 partially on the stack and partially in registers. */
2174 if (reg != 0 && REG_P (reg))
2175 use_reg (call_fusage, reg);
2180 /* Determine whether the LEN bytes generated by CONSTFUN can be
2181 stored to memory using several move instructions. CONSTFUNDATA is
2182 a pointer which will be passed as argument in every CONSTFUN call.
2183 ALIGN is maximum alignment we can assume. Return nonzero if a
2184 call to store_by_pieces should succeed. */
2187 can_store_by_pieces (unsigned HOST_WIDE_INT len,
2188 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2189 void *constfundata, unsigned int align)
2191 unsigned HOST_WIDE_INT l;
2192 unsigned int max_size;
2193 HOST_WIDE_INT offset = 0;
2194 enum machine_mode mode, tmode;
2195 enum insn_code icode;
2202 if (! STORE_BY_PIECES_P (len, align))
2205 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2206 if (align >= GET_MODE_ALIGNMENT (tmode))
2207 align = GET_MODE_ALIGNMENT (tmode);
2210 enum machine_mode xmode;
2212 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2214 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2215 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2216 || SLOW_UNALIGNED_ACCESS (tmode, align))
2219 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2222 /* We would first store what we can in the largest integer mode, then go to
2223 successively smaller modes. */
2226 reverse <= (HAVE_PRE_DECREMENT || HAVE_POST_DECREMENT);
2231 max_size = STORE_MAX_PIECES + 1;
2232 while (max_size > 1)
2234 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2235 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2236 if (GET_MODE_SIZE (tmode) < max_size)
2239 if (mode == VOIDmode)
2242 icode = mov_optab->handlers[(int) mode].insn_code;
2243 if (icode != CODE_FOR_nothing
2244 && align >= GET_MODE_ALIGNMENT (mode))
2246 unsigned int size = GET_MODE_SIZE (mode);
2253 cst = (*constfun) (constfundata, offset, mode);
2254 if (!LEGITIMATE_CONSTANT_P (cst))
2264 max_size = GET_MODE_SIZE (mode);
2267 /* The code above should have handled everything. */
2274 /* Generate several move instructions to store LEN bytes generated by
2275 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a
2276 pointer which will be passed as argument in every CONSTFUN call.
2277 ALIGN is maximum alignment we can assume.
2278 If ENDP is 0 return to, if ENDP is 1 return memory at the end ala
2279 mempcpy, and if ENDP is 2 return memory the end minus one byte ala
2283 store_by_pieces (rtx to, unsigned HOST_WIDE_INT len,
2284 rtx (*constfun) (void *, HOST_WIDE_INT, enum machine_mode),
2285 void *constfundata, unsigned int align, int endp)
2287 struct store_by_pieces data;
2291 gcc_assert (endp != 2);
2295 gcc_assert (STORE_BY_PIECES_P (len, align));
2296 data.constfun = constfun;
2297 data.constfundata = constfundata;
2300 store_by_pieces_1 (&data, align);
2305 gcc_assert (!data.reverse);
2310 if (HAVE_POST_INCREMENT && data.explicit_inc_to > 0)
2311 emit_insn (gen_add2_insn (data.to_addr, constm1_rtx));
2313 data.to_addr = copy_addr_to_reg (plus_constant (data.to_addr,
2316 to1 = adjust_automodify_address (data.to, QImode, data.to_addr,
2323 to1 = adjust_address (data.to, QImode, data.offset);
2331 /* Generate several move instructions to clear LEN bytes of block TO. (A MEM
2332 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2335 clear_by_pieces (rtx to, unsigned HOST_WIDE_INT len, unsigned int align)
2337 struct store_by_pieces data;
2342 data.constfun = clear_by_pieces_1;
2343 data.constfundata = NULL;
2346 store_by_pieces_1 (&data, align);
2349 /* Callback routine for clear_by_pieces.
2350 Return const0_rtx unconditionally. */
2353 clear_by_pieces_1 (void *data ATTRIBUTE_UNUSED,
2354 HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
2355 enum machine_mode mode ATTRIBUTE_UNUSED)
2360 /* Subroutine of clear_by_pieces and store_by_pieces.
2361 Generate several move instructions to store LEN bytes of block TO. (A MEM
2362 rtx with BLKmode). ALIGN is maximum alignment we can assume. */
2365 store_by_pieces_1 (struct store_by_pieces *data ATTRIBUTE_UNUSED,
2366 unsigned int align ATTRIBUTE_UNUSED)
2368 rtx to_addr = XEXP (data->to, 0);
2369 unsigned int max_size = STORE_MAX_PIECES + 1;
2370 enum machine_mode mode = VOIDmode, tmode;
2371 enum insn_code icode;
2374 data->to_addr = to_addr;
2376 = (GET_CODE (to_addr) == PRE_INC || GET_CODE (to_addr) == PRE_DEC
2377 || GET_CODE (to_addr) == POST_INC || GET_CODE (to_addr) == POST_DEC);
2379 data->explicit_inc_to = 0;
2381 = (GET_CODE (to_addr) == PRE_DEC || GET_CODE (to_addr) == POST_DEC);
2383 data->offset = data->len;
2385 /* If storing requires more than two move insns,
2386 copy addresses to registers (to make displacements shorter)
2387 and use post-increment if available. */
2388 if (!data->autinc_to
2389 && move_by_pieces_ninsns (data->len, align, max_size) > 2)
2391 /* Determine the main mode we'll be using. */
2392 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2393 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2394 if (GET_MODE_SIZE (tmode) < max_size)
2397 if (USE_STORE_PRE_DECREMENT (mode) && data->reverse && ! data->autinc_to)
2399 data->to_addr = copy_addr_to_reg (plus_constant (to_addr, data->len));
2400 data->autinc_to = 1;
2401 data->explicit_inc_to = -1;
2404 if (USE_STORE_POST_INCREMENT (mode) && ! data->reverse
2405 && ! data->autinc_to)
2407 data->to_addr = copy_addr_to_reg (to_addr);
2408 data->autinc_to = 1;
2409 data->explicit_inc_to = 1;
2412 if ( !data->autinc_to && CONSTANT_P (to_addr))
2413 data->to_addr = copy_addr_to_reg (to_addr);
2416 tmode = mode_for_size (STORE_MAX_PIECES * BITS_PER_UNIT, MODE_INT, 1);
2417 if (align >= GET_MODE_ALIGNMENT (tmode))
2418 align = GET_MODE_ALIGNMENT (tmode);
2421 enum machine_mode xmode;
2423 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT), xmode = tmode;
2425 xmode = tmode, tmode = GET_MODE_WIDER_MODE (tmode))
2426 if (GET_MODE_SIZE (tmode) > STORE_MAX_PIECES
2427 || SLOW_UNALIGNED_ACCESS (tmode, align))
2430 align = MAX (align, GET_MODE_ALIGNMENT (xmode));
2433 /* First store what we can in the largest integer mode, then go to
2434 successively smaller modes. */
2436 while (max_size > 1)
2438 for (tmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
2439 tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode))
2440 if (GET_MODE_SIZE (tmode) < max_size)
2443 if (mode == VOIDmode)
2446 icode = mov_optab->handlers[(int) mode].insn_code;
2447 if (icode != CODE_FOR_nothing && align >= GET_MODE_ALIGNMENT (mode))
2448 store_by_pieces_2 (GEN_FCN (icode), mode, data);
2450 max_size = GET_MODE_SIZE (mode);
2453 /* The code above should have handled everything. */
2454 gcc_assert (!data->len);
2457 /* Subroutine of store_by_pieces_1. Store as many bytes as appropriate
2458 with move instructions for mode MODE. GENFUN is the gen_... function
2459 to make a move insn for that mode. DATA has all the other info. */
2462 store_by_pieces_2 (rtx (*genfun) (rtx, ...), enum machine_mode mode,
2463 struct store_by_pieces *data)
2465 unsigned int size = GET_MODE_SIZE (mode);
2468 while (data->len >= size)
2471 data->offset -= size;
2473 if (data->autinc_to)
2474 to1 = adjust_automodify_address (data->to, mode, data->to_addr,
2477 to1 = adjust_address (data->to, mode, data->offset);
2479 if (HAVE_PRE_DECREMENT && data->explicit_inc_to < 0)
2480 emit_insn (gen_add2_insn (data->to_addr,
2481 GEN_INT (-(HOST_WIDE_INT) size)));
2483 cst = (*data->constfun) (data->constfundata, data->offset, mode);
2484 emit_insn ((*genfun) (to1, cst));
2486 if (HAVE_POST_INCREMENT && data->explicit_inc_to > 0)
2487 emit_insn (gen_add2_insn (data->to_addr, GEN_INT (size)));
2489 if (! data->reverse)
2490 data->offset += size;
2496 /* Write zeros through the storage of OBJECT. If OBJECT has BLKmode, SIZE is
2497 its length in bytes. */
2500 clear_storage (rtx object, rtx size, enum block_op_methods method)
2502 enum machine_mode mode = GET_MODE (object);
2505 gcc_assert (method == BLOCK_OP_NORMAL || method == BLOCK_OP_TAILCALL);
2507 /* If OBJECT is not BLKmode and SIZE is the same size as its mode,
2508 just move a zero. Otherwise, do this a piece at a time. */
2510 && GET_CODE (size) == CONST_INT
2511 && INTVAL (size) == (HOST_WIDE_INT) GET_MODE_SIZE (mode))
2513 rtx zero = CONST0_RTX (mode);
2516 emit_move_insn (object, zero);
2520 if (COMPLEX_MODE_P (mode))
2522 zero = CONST0_RTX (GET_MODE_INNER (mode));
2525 write_complex_part (object, zero, 0);
2526 write_complex_part (object, zero, 1);
2532 if (size == const0_rtx)
2535 align = MEM_ALIGN (object);
2537 if (GET_CODE (size) == CONST_INT
2538 && CLEAR_BY_PIECES_P (INTVAL (size), align))
2539 clear_by_pieces (object, INTVAL (size), align);
2540 else if (set_storage_via_setmem (object, size, const0_rtx, align))
2543 return clear_storage_via_libcall (object, size,
2544 method == BLOCK_OP_TAILCALL);
2549 /* A subroutine of clear_storage. Expand a call to memset.
2550 Return the return value of memset, 0 otherwise. */
2553 clear_storage_via_libcall (rtx object, rtx size, bool tailcall)
2555 tree call_expr, arg_list, fn, object_tree, size_tree;
2556 enum machine_mode size_mode;
2559 /* Emit code to copy OBJECT and SIZE into new pseudos. We can then
2560 place those into new pseudos into a VAR_DECL and use them later. */
2562 object = copy_to_mode_reg (Pmode, XEXP (object, 0));
2564 size_mode = TYPE_MODE (sizetype);
2565 size = convert_to_mode (size_mode, size, 1);
2566 size = copy_to_mode_reg (size_mode, size);
2568 /* It is incorrect to use the libcall calling conventions to call
2569 memset in this context. This could be a user call to memset and
2570 the user may wish to examine the return value from memset. For
2571 targets where libcalls and normal calls have different conventions
2572 for returning pointers, we could end up generating incorrect code. */
2574 object_tree = make_tree (ptr_type_node, object);
2575 size_tree = make_tree (sizetype, size);
2577 fn = clear_storage_libcall_fn (true);
2578 arg_list = tree_cons (NULL_TREE, size_tree, NULL_TREE);
2579 arg_list = tree_cons (NULL_TREE, integer_zero_node, arg_list);
2580 arg_list = tree_cons (NULL_TREE, object_tree, arg_list);
2582 /* Now we have to build up the CALL_EXPR itself. */
2583 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
2584 call_expr = build3 (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
2585 call_expr, arg_list, NULL_TREE);
2586 CALL_EXPR_TAILCALL (call_expr) = tailcall;
2588 retval = expand_normal (call_expr);
2593 /* A subroutine of clear_storage_via_libcall. Create the tree node
2594 for the function we use for block clears. The first time FOR_CALL
2595 is true, we call assemble_external. */
2597 static GTY(()) tree block_clear_fn;
2600 init_block_clear_fn (const char *asmspec)
2602 if (!block_clear_fn)
2606 fn = get_identifier ("memset");
2607 args = build_function_type_list (ptr_type_node, ptr_type_node,
2608 integer_type_node, sizetype,
2611 fn = build_decl (FUNCTION_DECL, fn, args);
2612 DECL_EXTERNAL (fn) = 1;
2613 TREE_PUBLIC (fn) = 1;
2614 DECL_ARTIFICIAL (fn) = 1;
2615 TREE_NOTHROW (fn) = 1;
2616 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
2617 DECL_VISIBILITY_SPECIFIED (fn) = 1;
2619 block_clear_fn = fn;
2623 set_user_assembler_name (block_clear_fn, asmspec);
2627 clear_storage_libcall_fn (int for_call)
2629 static bool emitted_extern;
2631 if (!block_clear_fn)
2632 init_block_clear_fn (NULL);
2634 if (for_call && !emitted_extern)
2636 emitted_extern = true;
2637 make_decl_rtl (block_clear_fn);
2638 assemble_external (block_clear_fn);
2641 return block_clear_fn;
2644 /* Expand a setmem pattern; return true if successful. */
2647 set_storage_via_setmem (rtx object, rtx size, rtx val, unsigned int align)
2649 /* Try the most limited insn first, because there's no point
2650 including more than one in the machine description unless
2651 the more limited one has some advantage. */
2653 rtx opalign = GEN_INT (align / BITS_PER_UNIT);
2654 enum machine_mode mode;
2656 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
2657 mode = GET_MODE_WIDER_MODE (mode))
2659 enum insn_code code = setmem_optab[(int) mode];
2660 insn_operand_predicate_fn pred;
2662 if (code != CODE_FOR_nothing
2663 /* We don't need MODE to be narrower than
2664 BITS_PER_HOST_WIDE_INT here because if SIZE is less than
2665 the mode mask, as it is returned by the macro, it will
2666 definitely be less than the actual mode mask. */
2667 && ((GET_CODE (size) == CONST_INT
2668 && ((unsigned HOST_WIDE_INT) INTVAL (size)
2669 <= (GET_MODE_MASK (mode) >> 1)))
2670 || GET_MODE_BITSIZE (mode) >= BITS_PER_WORD)
2671 && ((pred = insn_data[(int) code].operand[0].predicate) == 0
2672 || (*pred) (object, BLKmode))
2673 && ((pred = insn_data[(int) code].operand[3].predicate) == 0
2674 || (*pred) (opalign, VOIDmode)))
2677 enum machine_mode char_mode;
2678 rtx last = get_last_insn ();
2681 opsize = convert_to_mode (mode, size, 1);
2682 pred = insn_data[(int) code].operand[1].predicate;
2683 if (pred != 0 && ! (*pred) (opsize, mode))
2684 opsize = copy_to_mode_reg (mode, opsize);
2687 char_mode = insn_data[(int) code].operand[2].mode;
2688 if (char_mode != VOIDmode)
2690 opchar = convert_to_mode (char_mode, opchar, 1);
2691 pred = insn_data[(int) code].operand[2].predicate;
2692 if (pred != 0 && ! (*pred) (opchar, char_mode))
2693 opchar = copy_to_mode_reg (char_mode, opchar);
2696 pat = GEN_FCN ((int) code) (object, opsize, opchar, opalign);
2703 delete_insns_since (last);
2711 /* Write to one of the components of the complex value CPLX. Write VAL to
2712 the real part if IMAG_P is false, and the imaginary part if its true. */
2715 write_complex_part (rtx cplx, rtx val, bool imag_p)
2717 enum machine_mode cmode;
2718 enum machine_mode imode;
2721 if (GET_CODE (cplx) == CONCAT)
2723 emit_move_insn (XEXP (cplx, imag_p), val);
2727 cmode = GET_MODE (cplx);
2728 imode = GET_MODE_INNER (cmode);
2729 ibitsize = GET_MODE_BITSIZE (imode);
2731 /* For MEMs simplify_gen_subreg may generate an invalid new address
2732 because, e.g., the original address is considered mode-dependent
2733 by the target, which restricts simplify_subreg from invoking
2734 adjust_address_nv. Instead of preparing fallback support for an
2735 invalid address, we call adjust_address_nv directly. */
2738 emit_move_insn (adjust_address_nv (cplx, imode,
2739 imag_p ? GET_MODE_SIZE (imode) : 0),
2744 /* If the sub-object is at least word sized, then we know that subregging
2745 will work. This special case is important, since store_bit_field
2746 wants to operate on integer modes, and there's rarely an OImode to
2747 correspond to TCmode. */
2748 if (ibitsize >= BITS_PER_WORD
2749 /* For hard regs we have exact predicates. Assume we can split
2750 the original object if it spans an even number of hard regs.
2751 This special case is important for SCmode on 64-bit platforms
2752 where the natural size of floating-point regs is 32-bit. */
2754 && REGNO (cplx) < FIRST_PSEUDO_REGISTER
2755 && hard_regno_nregs[REGNO (cplx)][cmode] % 2 == 0))
2757 rtx part = simplify_gen_subreg (imode, cplx, cmode,
2758 imag_p ? GET_MODE_SIZE (imode) : 0);
2761 emit_move_insn (part, val);
2765 /* simplify_gen_subreg may fail for sub-word MEMs. */
2766 gcc_assert (MEM_P (cplx) && ibitsize < BITS_PER_WORD);
2769 store_bit_field (cplx, ibitsize, imag_p ? ibitsize : 0, imode, val);
2772 /* Extract one of the components of the complex value CPLX. Extract the
2773 real part if IMAG_P is false, and the imaginary part if it's true. */
2776 read_complex_part (rtx cplx, bool imag_p)
2778 enum machine_mode cmode, imode;
2781 if (GET_CODE (cplx) == CONCAT)
2782 return XEXP (cplx, imag_p);
2784 cmode = GET_MODE (cplx);
2785 imode = GET_MODE_INNER (cmode);
2786 ibitsize = GET_MODE_BITSIZE (imode);
2788 /* Special case reads from complex constants that got spilled to memory. */
2789 if (MEM_P (cplx) && GET_CODE (XEXP (cplx, 0)) == SYMBOL_REF)
2791 tree decl = SYMBOL_REF_DECL (XEXP (cplx, 0));
2792 if (decl && TREE_CODE (decl) == COMPLEX_CST)
2794 tree part = imag_p ? TREE_IMAGPART (decl) : TREE_REALPART (decl);
2795 if (CONSTANT_CLASS_P (part))
2796 return expand_expr (part, NULL_RTX, imode, EXPAND_NORMAL);
2800 /* For MEMs simplify_gen_subreg may generate an invalid new address
2801 because, e.g., the original address is considered mode-dependent
2802 by the target, which restricts simplify_subreg from invoking
2803 adjust_address_nv. Instead of preparing fallback support for an
2804 invalid address, we call adjust_address_nv directly. */
2806 return adjust_address_nv (cplx, imode,
2807 imag_p ? GET_MODE_SIZE (imode) : 0);
2809 /* If the sub-object is at least word sized, then we know that subregging
2810 will work. This special case is important, since extract_bit_field
2811 wants to operate on integer modes, and there's rarely an OImode to
2812 correspond to TCmode. */
2813 if (ibitsize >= BITS_PER_WORD
2814 /* For hard regs we have exact predicates. Assume we can split
2815 the original object if it spans an even number of hard regs.
2816 This special case is important for SCmode on 64-bit platforms
2817 where the natural size of floating-point regs is 32-bit. */
2819 && REGNO (cplx) < FIRST_PSEUDO_REGISTER
2820 && hard_regno_nregs[REGNO (cplx)][cmode] % 2 == 0))
2822 rtx ret = simplify_gen_subreg (imode, cplx, cmode,
2823 imag_p ? GET_MODE_SIZE (imode) : 0);
2827 /* simplify_gen_subreg may fail for sub-word MEMs. */
2828 gcc_assert (MEM_P (cplx) && ibitsize < BITS_PER_WORD);
2831 return extract_bit_field (cplx, ibitsize, imag_p ? ibitsize : 0,
2832 true, NULL_RTX, imode, imode);
2835 /* A subroutine of emit_move_insn_1. Yet another lowpart generator.
2836 NEW_MODE and OLD_MODE are the same size. Return NULL if X cannot be
2837 represented in NEW_MODE. If FORCE is true, this will never happen, as
2838 we'll force-create a SUBREG if needed. */
2841 emit_move_change_mode (enum machine_mode new_mode,
2842 enum machine_mode old_mode, rtx x, bool force)
2848 /* We don't have to worry about changing the address since the
2849 size in bytes is supposed to be the same. */
2850 if (reload_in_progress)
2852 /* Copy the MEM to change the mode and move any
2853 substitutions from the old MEM to the new one. */
2854 ret = adjust_address_nv (x, new_mode, 0);
2855 copy_replacements (x, ret);
2858 ret = adjust_address (x, new_mode, 0);
2862 /* Note that we do want simplify_subreg's behavior of validating
2863 that the new mode is ok for a hard register. If we were to use
2864 simplify_gen_subreg, we would create the subreg, but would
2865 probably run into the target not being able to implement it. */
2866 /* Except, of course, when FORCE is true, when this is exactly what
2867 we want. Which is needed for CCmodes on some targets. */
2869 ret = simplify_gen_subreg (new_mode, x, old_mode, 0);
2871 ret = simplify_subreg (new_mode, x, old_mode, 0);
2877 /* A subroutine of emit_move_insn_1. Generate a move from Y into X using
2878 an integer mode of the same size as MODE. Returns the instruction
2879 emitted, or NULL if such a move could not be generated. */
2882 emit_move_via_integer (enum machine_mode mode, rtx x, rtx y, bool force)
2884 enum machine_mode imode;
2885 enum insn_code code;
2887 /* There must exist a mode of the exact size we require. */
2888 imode = int_mode_for_mode (mode);
2889 if (imode == BLKmode)
2892 /* The target must support moves in this mode. */
2893 code = mov_optab->handlers[imode].insn_code;
2894 if (code == CODE_FOR_nothing)
2897 x = emit_move_change_mode (imode, mode, x, force);
2900 y = emit_move_change_mode (imode, mode, y, force);
2903 return emit_insn (GEN_FCN (code) (x, y));
2906 /* A subroutine of emit_move_insn_1. X is a push_operand in MODE.
2907 Return an equivalent MEM that does not use an auto-increment. */
2910 emit_move_resolve_push (enum machine_mode mode, rtx x)
2912 enum rtx_code code = GET_CODE (XEXP (x, 0));
2913 HOST_WIDE_INT adjust;
2916 adjust = GET_MODE_SIZE (mode);
2917 #ifdef PUSH_ROUNDING
2918 adjust = PUSH_ROUNDING (adjust);
2920 if (code == PRE_DEC || code == POST_DEC)
2922 else if (code == PRE_MODIFY || code == POST_MODIFY)
2924 rtx expr = XEXP (XEXP (x, 0), 1);
2927 gcc_assert (GET_CODE (expr) == PLUS || GET_CODE (expr) == MINUS);
2928 gcc_assert (GET_CODE (XEXP (expr, 1)) == CONST_INT);
2929 val = INTVAL (XEXP (expr, 1));
2930 if (GET_CODE (expr) == MINUS)
2932 gcc_assert (adjust == val || adjust == -val);
2936 /* Do not use anti_adjust_stack, since we don't want to update
2937 stack_pointer_delta. */
2938 temp = expand_simple_binop (Pmode, PLUS, stack_pointer_rtx,
2939 GEN_INT (adjust), stack_pointer_rtx,
2940 0, OPTAB_LIB_WIDEN);
2941 if (temp != stack_pointer_rtx)
2942 emit_move_insn (stack_pointer_rtx, temp);
2949 temp = stack_pointer_rtx;
2954 temp = plus_constant (stack_pointer_rtx, -adjust);
2960 return replace_equiv_address (x, temp);
2963 /* A subroutine of emit_move_complex. Generate a move from Y into X.
2964 X is known to satisfy push_operand, and MODE is known to be complex.
2965 Returns the last instruction emitted. */
2968 emit_move_complex_push (enum machine_mode mode, rtx x, rtx y)
2970 enum machine_mode submode = GET_MODE_INNER (mode);
2973 #ifdef PUSH_ROUNDING
2974 unsigned int submodesize = GET_MODE_SIZE (submode);
2976 /* In case we output to the stack, but the size is smaller than the
2977 machine can push exactly, we need to use move instructions. */
2978 if (PUSH_ROUNDING (submodesize) != submodesize)
2980 x = emit_move_resolve_push (mode, x);
2981 return emit_move_insn (x, y);
2985 /* Note that the real part always precedes the imag part in memory
2986 regardless of machine's endianness. */
2987 switch (GET_CODE (XEXP (x, 0)))
3001 emit_move_insn (gen_rtx_MEM (submode, XEXP (x, 0)),
3002 read_complex_part (y, imag_first));
3003 return emit_move_insn (gen_rtx_MEM (submode, XEXP (x, 0)),
3004 read_complex_part (y, !imag_first));
3007 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3008 MODE is known to be complex. Returns the last instruction emitted. */
3011 emit_move_complex (enum machine_mode mode, rtx x, rtx y)
3015 /* Need to take special care for pushes, to maintain proper ordering
3016 of the data, and possibly extra padding. */
3017 if (push_operand (x, mode))
3018 return emit_move_complex_push (mode, x, y);
3020 /* See if we can coerce the target into moving both values at once. */
3022 /* Move floating point as parts. */
3023 if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
3024 && mov_optab->handlers[GET_MODE_INNER (mode)].insn_code != CODE_FOR_nothing)
3026 /* Not possible if the values are inherently not adjacent. */
3027 else if (GET_CODE (x) == CONCAT || GET_CODE (y) == CONCAT)
3029 /* Is possible if both are registers (or subregs of registers). */
3030 else if (register_operand (x, mode) && register_operand (y, mode))
3032 /* If one of the operands is a memory, and alignment constraints
3033 are friendly enough, we may be able to do combined memory operations.
3034 We do not attempt this if Y is a constant because that combination is
3035 usually better with the by-parts thing below. */
3036 else if ((MEM_P (x) ? !CONSTANT_P (y) : MEM_P (y))
3037 && (!STRICT_ALIGNMENT
3038 || get_mode_alignment (mode) == BIGGEST_ALIGNMENT))
3047 /* For memory to memory moves, optimal behavior can be had with the
3048 existing block move logic. */
3049 if (MEM_P (x) && MEM_P (y))
3051 emit_block_move (x, y, GEN_INT (GET_MODE_SIZE (mode)),
3052 BLOCK_OP_NO_LIBCALL);
3053 return get_last_insn ();
3056 ret = emit_move_via_integer (mode, x, y, true);
3061 /* Show the output dies here. This is necessary for SUBREGs
3062 of pseudos since we cannot track their lifetimes correctly;
3063 hard regs shouldn't appear here except as return values. */
3064 if (!reload_completed && !reload_in_progress
3065 && REG_P (x) && !reg_overlap_mentioned_p (x, y))
3066 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
3068 write_complex_part (x, read_complex_part (y, false), false);
3069 write_complex_part (x, read_complex_part (y, true), true);
3070 return get_last_insn ();
3073 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3074 MODE is known to be MODE_CC. Returns the last instruction emitted. */
3077 emit_move_ccmode (enum machine_mode mode, rtx x, rtx y)
3081 /* Assume all MODE_CC modes are equivalent; if we have movcc, use it. */
3084 enum insn_code code = mov_optab->handlers[CCmode].insn_code;
3085 if (code != CODE_FOR_nothing)
3087 x = emit_move_change_mode (CCmode, mode, x, true);
3088 y = emit_move_change_mode (CCmode, mode, y, true);
3089 return emit_insn (GEN_FCN (code) (x, y));
3093 /* Otherwise, find the MODE_INT mode of the same width. */
3094 ret = emit_move_via_integer (mode, x, y, false);
3095 gcc_assert (ret != NULL);
3099 /* A subroutine of emit_move_insn_1. Generate a move from Y into X.
3100 MODE is any multi-word or full-word mode that lacks a move_insn
3101 pattern. Note that you will get better code if you define such
3102 patterns, even if they must turn into multiple assembler instructions. */
3105 emit_move_multi_word (enum machine_mode mode, rtx x, rtx y)
3112 gcc_assert (GET_MODE_SIZE (mode) >= UNITS_PER_WORD);
3114 /* If X is a push on the stack, do the push now and replace
3115 X with a reference to the stack pointer. */
3116 if (push_operand (x, mode))
3117 x = emit_move_resolve_push (mode, x);
3119 /* If we are in reload, see if either operand is a MEM whose address
3120 is scheduled for replacement. */
3121 if (reload_in_progress && MEM_P (x)
3122 && (inner = find_replacement (&XEXP (x, 0))) != XEXP (x, 0))
3123 x = replace_equiv_address_nv (x, inner);
3124 if (reload_in_progress && MEM_P (y)
3125 && (inner = find_replacement (&XEXP (y, 0))) != XEXP (y, 0))
3126 y = replace_equiv_address_nv (y, inner);
3130 need_clobber = false;
3132 i < (GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
3135 rtx xpart = operand_subword (x, i, 1, mode);
3136 rtx ypart = operand_subword (y, i, 1, mode);
3138 /* If we can't get a part of Y, put Y into memory if it is a
3139 constant. Otherwise, force it into a register. Then we must
3140 be able to get a part of Y. */
3141 if (ypart == 0 && CONSTANT_P (y))
3143 y = use_anchored_address (force_const_mem (mode, y));
3144 ypart = operand_subword (y, i, 1, mode);
3146 else if (ypart == 0)
3147 ypart = operand_subword_force (y, i, mode);
3149 gcc_assert (xpart && ypart);
3151 need_clobber |= (GET_CODE (xpart) == SUBREG);
3153 last_insn = emit_move_insn (xpart, ypart);
3159 /* Show the output dies here. This is necessary for SUBREGs
3160 of pseudos since we cannot track their lifetimes correctly;
3161 hard regs shouldn't appear here except as return values.
3162 We never want to emit such a clobber after reload. */
3164 && ! (reload_in_progress || reload_completed)
3165 && need_clobber != 0)
3166 emit_insn (gen_rtx_CLOBBER (VOIDmode, x));
3173 /* Low level part of emit_move_insn.
3174 Called just like emit_move_insn, but assumes X and Y
3175 are basically valid. */
3178 emit_move_insn_1 (rtx x, rtx y)
3180 enum machine_mode mode = GET_MODE (x);
3181 enum insn_code code;
3183 gcc_assert ((unsigned int) mode < (unsigned int) MAX_MACHINE_MODE);
3185 code = mov_optab->handlers[mode].insn_code;
3186 if (code != CODE_FOR_nothing)
3187 return emit_insn (GEN_FCN (code) (x, y));
3189 /* Expand complex moves by moving real part and imag part. */
3190 if (COMPLEX_MODE_P (mode))
3191 return emit_move_complex (mode, x, y);
3193 if (GET_MODE_CLASS (mode) == MODE_DECIMAL_FLOAT)
3195 rtx result = emit_move_via_integer (mode, x, y, true);
3197 /* If we can't find an integer mode, use multi words. */
3201 return emit_move_multi_word (mode, x, y);
3204 if (GET_MODE_CLASS (mode) == MODE_CC)
3205 return emit_move_ccmode (mode, x, y);
3207 /* Try using a move pattern for the corresponding integer mode. This is
3208 only safe when simplify_subreg can convert MODE constants into integer
3209 constants. At present, it can only do this reliably if the value
3210 fits within a HOST_WIDE_INT. */
3211 if (!CONSTANT_P (y) || GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
3213 rtx ret = emit_move_via_integer (mode, x, y, false);
3218 return emit_move_multi_word (mode, x, y);
3221 /* Generate code to copy Y into X.
3222 Both Y and X must have the same mode, except that
3223 Y can be a constant with VOIDmode.
3224 This mode cannot be BLKmode; use emit_block_move for that.
3226 Return the last instruction emitted. */
3229 emit_move_insn (rtx x, rtx y)
3231 enum machine_mode mode = GET_MODE (x);
3232 rtx y_cst = NULL_RTX;
3235 gcc_assert (mode != BLKmode
3236 && (GET_MODE (y) == mode || GET_MODE (y) == VOIDmode));
3241 && SCALAR_FLOAT_MODE_P (GET_MODE (x))
3242 && (last_insn = compress_float_constant (x, y)))
3247 if (!LEGITIMATE_CONSTANT_P (y))
3249 y = force_const_mem (mode, y);
3251 /* If the target's cannot_force_const_mem prevented the spill,
3252 assume that the target's move expanders will also take care
3253 of the non-legitimate constant. */
3257 y = use_anchored_address (y);
3261 /* If X or Y are memory references, verify that their addresses are valid
3264 && ((! memory_address_p (GET_MODE (x), XEXP (x, 0))
3265 && ! push_operand (x, GET_MODE (x)))
3267 && CONSTANT_ADDRESS_P (XEXP (x, 0)))))
3268 x = validize_mem (x);
3271 && (! memory_address_p (GET_MODE (y), XEXP (y, 0))
3273 && CONSTANT_ADDRESS_P (XEXP (y, 0)))))
3274 y = validize_mem (y);
3276 gcc_assert (mode != BLKmode);
3278 last_insn = emit_move_insn_1 (x, y);
3280 if (y_cst && REG_P (x)
3281 && (set = single_set (last_insn)) != NULL_RTX
3282 && SET_DEST (set) == x
3283 && ! rtx_equal_p (y_cst, SET_SRC (set)))
3284 set_unique_reg_note (last_insn, REG_EQUAL, y_cst);
3289 /* If Y is representable exactly in a narrower mode, and the target can
3290 perform the extension directly from constant or memory, then emit the
3291 move as an extension. */
3294 compress_float_constant (rtx x, rtx y)
3296 enum machine_mode dstmode = GET_MODE (x);
3297 enum machine_mode orig_srcmode = GET_MODE (y);
3298 enum machine_mode srcmode;
3300 int oldcost, newcost;
3302 REAL_VALUE_FROM_CONST_DOUBLE (r, y);
3304 if (LEGITIMATE_CONSTANT_P (y))
3305 oldcost = rtx_cost (y, SET);
3307 oldcost = rtx_cost (force_const_mem (dstmode, y), SET);
3309 for (srcmode = GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_srcmode));
3310 srcmode != orig_srcmode;
3311 srcmode = GET_MODE_WIDER_MODE (srcmode))
3314 rtx trunc_y, last_insn;
3316 /* Skip if the target can't extend this way. */
3317 ic = can_extend_p (dstmode, srcmode, 0);
3318 if (ic == CODE_FOR_nothing)
3321 /* Skip if the narrowed value isn't exact. */
3322 if (! exact_real_truncate (srcmode, &r))
3325 trunc_y = CONST_DOUBLE_FROM_REAL_VALUE (r, srcmode);
3327 if (LEGITIMATE_CONSTANT_P (trunc_y))
3329 /* Skip if the target needs extra instructions to perform
3331 if (! (*insn_data[ic].operand[1].predicate) (trunc_y, srcmode))
3333 /* This is valid, but may not be cheaper than the original. */
3334 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
3335 if (oldcost < newcost)
3338 else if (float_extend_from_mem[dstmode][srcmode])
3340 trunc_y = force_const_mem (srcmode, trunc_y);
3341 /* This is valid, but may not be cheaper than the original. */
3342 newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
3343 if (oldcost < newcost)
3345 trunc_y = validize_mem (trunc_y);
3350 /* For CSE's benefit, force the compressed constant pool entry
3351 into a new pseudo. This constant may be used in different modes,
3352 and if not, combine will put things back together for us. */
3353 trunc_y = force_reg (srcmode, trunc_y);
3354 emit_unop_insn (ic, x, trunc_y, UNKNOWN);
3355 last_insn = get_last_insn ();
3358 set_unique_reg_note (last_insn, REG_EQUAL, y);
3366 /* Pushing data onto the stack. */
3368 /* Push a block of length SIZE (perhaps variable)
3369 and return an rtx to address the beginning of the block.
3370 The value may be virtual_outgoing_args_rtx.
3372 EXTRA is the number of bytes of padding to push in addition to SIZE.
3373 BELOW nonzero means this padding comes at low addresses;
3374 otherwise, the padding comes at high addresses. */
3377 push_block (rtx size, int extra, int below)
3381 size = convert_modes (Pmode, ptr_mode, size, 1);
3382 if (CONSTANT_P (size))
3383 anti_adjust_stack (plus_constant (size, extra));
3384 else if (REG_P (size) && extra == 0)
3385 anti_adjust_stack (size);
3388 temp = copy_to_mode_reg (Pmode, size);
3390 temp = expand_binop (Pmode, add_optab, temp, GEN_INT (extra),
3391 temp, 0, OPTAB_LIB_WIDEN);
3392 anti_adjust_stack (temp);
3395 #ifndef STACK_GROWS_DOWNWARD
3401 temp = virtual_outgoing_args_rtx;
3402 if (extra != 0 && below)
3403 temp = plus_constant (temp, extra);
3407 if (GET_CODE (size) == CONST_INT)
3408 temp = plus_constant (virtual_outgoing_args_rtx,
3409 -INTVAL (size) - (below ? 0 : extra));
3410 else if (extra != 0 && !below)
3411 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3412 negate_rtx (Pmode, plus_constant (size, extra)));
3414 temp = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx,
3415 negate_rtx (Pmode, size));
3418 return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
3421 #ifdef PUSH_ROUNDING
3423 /* Emit single push insn. */
3426 emit_single_push_insn (enum machine_mode mode, rtx x, tree type)
3429 unsigned rounded_size = PUSH_ROUNDING (GET_MODE_SIZE (mode));
3431 enum insn_code icode;
3432 insn_operand_predicate_fn pred;
3434 stack_pointer_delta += PUSH_ROUNDING (GET_MODE_SIZE (mode));
3435 /* If there is push pattern, use it. Otherwise try old way of throwing
3436 MEM representing push operation to move expander. */
3437 icode = push_optab->handlers[(int) mode].insn_code;
3438 if (icode != CODE_FOR_nothing)
3440 if (((pred = insn_data[(int) icode].operand[0].predicate)
3441 && !((*pred) (x, mode))))
3442 x = force_reg (mode, x);
3443 emit_insn (GEN_FCN (icode) (x));
3446 if (GET_MODE_SIZE (mode) == rounded_size)
3447 dest_addr = gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
3448 /* If we are to pad downward, adjust the stack pointer first and
3449 then store X into the stack location using an offset. This is
3450 because emit_move_insn does not know how to pad; it does not have
3452 else if (FUNCTION_ARG_PADDING (mode, type) == downward)
3454 unsigned padding_size = rounded_size - GET_MODE_SIZE (mode);
3455 HOST_WIDE_INT offset;
3457 emit_move_insn (stack_pointer_rtx,
3458 expand_binop (Pmode,
3459 #ifdef STACK_GROWS_DOWNWARD
3465 GEN_INT (rounded_size),
3466 NULL_RTX, 0, OPTAB_LIB_WIDEN));
3468 offset = (HOST_WIDE_INT) padding_size;
3469 #ifdef STACK_GROWS_DOWNWARD
3470 if (STACK_PUSH_CODE == POST_DEC)
3471 /* We have already decremented the stack pointer, so get the
3473 offset += (HOST_WIDE_INT) rounded_size;
3475 if (STACK_PUSH_CODE == POST_INC)
3476 /* We have already incremented the stack pointer, so get the
3478 offset -= (HOST_WIDE_INT) rounded_size;
3480 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offset));
3484 #ifdef STACK_GROWS_DOWNWARD
3485 /* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC. */
3486 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3487 GEN_INT (-(HOST_WIDE_INT) rounded_size));
3489 /* ??? This seems wrong if STACK_PUSH_CODE == POST_INC. */
3490 dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
3491 GEN_INT (rounded_size));
3493 dest_addr = gen_rtx_PRE_MODIFY (Pmode, stack_pointer_rtx, dest_addr);
3496 dest = gen_rtx_MEM (mode, dest_addr);
3500 set_mem_attributes (dest, type, 1);
3502 if (flag_optimize_sibling_calls)
3503 /* Function incoming arguments may overlap with sibling call
3504 outgoing arguments and we cannot allow reordering of reads
3505 from function arguments with stores to outgoing arguments
3506 of sibling calls. */
3507 set_mem_alias_set (dest, 0);
3509 emit_move_insn (dest, x);
3513 /* Generate code to push X onto the stack, assuming it has mode MODE and
3515 MODE is redundant except when X is a CONST_INT (since they don't
3517 SIZE is an rtx for the size of data to be copied (in bytes),
3518 needed only if X is BLKmode.
3520 ALIGN (in bits) is maximum alignment we can assume.
3522 If PARTIAL and REG are both nonzero, then copy that many of the first
3523 bytes of X into registers starting with REG, and push the rest of X.
3524 The amount of space pushed is decreased by PARTIAL bytes.
3525 REG must be a hard register in this case.
3526 If REG is zero but PARTIAL is not, take any all others actions for an
3527 argument partially in registers, but do not actually load any
3530 EXTRA is the amount in bytes of extra space to leave next to this arg.
3531 This is ignored if an argument block has already been allocated.
3533 On a machine that lacks real push insns, ARGS_ADDR is the address of
3534 the bottom of the argument block for this call. We use indexing off there
3535 to store the arg. On machines with push insns, ARGS_ADDR is 0 when a
3536 argument block has not been preallocated.
3538 ARGS_SO_FAR is the size of args previously pushed for this call.
3540 REG_PARM_STACK_SPACE is nonzero if functions require stack space
3541 for arguments passed in registers. If nonzero, it will be the number
3542 of bytes required. */
3545 emit_push_insn (rtx x, enum machine_mode mode, tree type, rtx size,
3546 unsigned int align, int partial, rtx reg, int extra,
3547 rtx args_addr, rtx args_so_far, int reg_parm_stack_space,
3551 enum direction stack_direction
3552 #ifdef STACK_GROWS_DOWNWARD
3558 /* Decide where to pad the argument: `downward' for below,
3559 `upward' for above, or `none' for don't pad it.
3560 Default is below for small data on big-endian machines; else above. */
3561 enum direction where_pad = FUNCTION_ARG_PADDING (mode, type);
3563 /* Invert direction if stack is post-decrement.
3565 if (STACK_PUSH_CODE == POST_DEC)
3566 if (where_pad != none)
3567 where_pad = (where_pad == downward ? upward : downward);
3571 if (mode == BLKmode)
3573 /* Copy a block into the stack, entirely or partially. */
3580 offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3581 used = partial - offset;
3585 /* USED is now the # of bytes we need not copy to the stack
3586 because registers will take care of them. */
3589 xinner = adjust_address (xinner, BLKmode, used);
3591 /* If the partial register-part of the arg counts in its stack size,
3592 skip the part of stack space corresponding to the registers.
3593 Otherwise, start copying to the beginning of the stack space,
3594 by setting SKIP to 0. */
3595 skip = (reg_parm_stack_space == 0) ? 0 : used;
3597 #ifdef PUSH_ROUNDING
3598 /* Do it with several push insns if that doesn't take lots of insns
3599 and if there is no difficulty with push insns that skip bytes
3600 on the stack for alignment purposes. */
3603 && GET_CODE (size) == CONST_INT
3605 && MEM_ALIGN (xinner) >= align
3606 && (MOVE_BY_PIECES_P ((unsigned) INTVAL (size) - used, align))
3607 /* Here we avoid the case of a structure whose weak alignment
3608 forces many pushes of a small amount of data,
3609 and such small pushes do rounding that causes trouble. */
3610 && ((! SLOW_UNALIGNED_ACCESS (word_mode, align))
3611 || align >= BIGGEST_ALIGNMENT
3612 || (PUSH_ROUNDING (align / BITS_PER_UNIT)
3613 == (align / BITS_PER_UNIT)))
3614 && PUSH_ROUNDING (INTVAL (size)) == INTVAL (size))
3616 /* Push padding now if padding above and stack grows down,
3617 or if padding below and stack grows up.
3618 But if space already allocated, this has already been done. */
3619 if (extra && args_addr == 0
3620 && where_pad != none && where_pad != stack_direction)
3621 anti_adjust_stack (GEN_INT (extra));
3623 move_by_pieces (NULL, xinner, INTVAL (size) - used, align, 0);
3626 #endif /* PUSH_ROUNDING */
3630 /* Otherwise make space on the stack and copy the data
3631 to the address of that space. */
3633 /* Deduct words put into registers from the size we must copy. */
3636 if (GET_CODE (size) == CONST_INT)
3637 size = GEN_INT (INTVAL (size) - used);
3639 size = expand_binop (GET_MODE (size), sub_optab, size,
3640 GEN_INT (used), NULL_RTX, 0,
3644 /* Get the address of the stack space.
3645 In this case, we do not deal with EXTRA separately.
3646 A single stack adjust will do. */
3649 temp = push_block (size, extra, where_pad == downward);
3652 else if (GET_CODE (args_so_far) == CONST_INT)
3653 temp = memory_address (BLKmode,
3654 plus_constant (args_addr,
3655 skip + INTVAL (args_so_far)));
3657 temp = memory_address (BLKmode,
3658 plus_constant (gen_rtx_PLUS (Pmode,
3663 if (!ACCUMULATE_OUTGOING_ARGS)
3665 /* If the source is referenced relative to the stack pointer,
3666 copy it to another register to stabilize it. We do not need
3667 to do this if we know that we won't be changing sp. */
3669 if (reg_mentioned_p (virtual_stack_dynamic_rtx, temp)
3670 || reg_mentioned_p (virtual_outgoing_args_rtx, temp))
3671 temp = copy_to_reg (temp);
3674 target = gen_rtx_MEM (BLKmode, temp);
3676 /* We do *not* set_mem_attributes here, because incoming arguments
3677 may overlap with sibling call outgoing arguments and we cannot
3678 allow reordering of reads from function arguments with stores
3679 to outgoing arguments of sibling calls. We do, however, want
3680 to record the alignment of the stack slot. */
3681 /* ALIGN may well be better aligned than TYPE, e.g. due to
3682 PARM_BOUNDARY. Assume the caller isn't lying. */
3683 set_mem_align (target, align);
3685 emit_block_move (target, xinner, size, BLOCK_OP_CALL_PARM);
3688 else if (partial > 0)
3690 /* Scalar partly in registers. */
3692 int size = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
3695 /* # bytes of start of argument
3696 that we must make space for but need not store. */
3697 int offset = partial % (PARM_BOUNDARY / BITS_PER_UNIT);
3698 int args_offset = INTVAL (args_so_far);
3701 /* Push padding now if padding above and stack grows down,
3702 or if padding below and stack grows up.
3703 But if space already allocated, this has already been done. */
3704 if (extra && args_addr == 0
3705 && where_pad != none && where_pad != stack_direction)
3706 anti_adjust_stack (GEN_INT (extra));
3708 /* If we make space by pushing it, we might as well push
3709 the real data. Otherwise, we can leave OFFSET nonzero
3710 and leave the space uninitialized. */
3714 /* Now NOT_STACK gets the number of words that we don't need to
3715 allocate on the stack. Convert OFFSET to words too. */
3716 not_stack = (partial - offset) / UNITS_PER_WORD;
3717 offset /= UNITS_PER_WORD;
3719 /* If the partial register-part of the arg counts in its stack size,
3720 skip the part of stack space corresponding to the registers.
3721 Otherwise, start copying to the beginning of the stack space,
3722 by setting SKIP to 0. */
3723 skip = (reg_parm_stack_space == 0) ? 0 : not_stack;
3725 if (CONSTANT_P (x) && ! LEGITIMATE_CONSTANT_P (x))
3726 x = validize_mem (force_const_mem (mode, x));
3728 /* If X is a hard register in a non-integer mode, copy it into a pseudo;
3729 SUBREGs of such registers are not allowed. */
3730 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER
3731 && GET_MODE_CLASS (GET_MODE (x)) != MODE_INT))
3732 x = copy_to_reg (x);
3734 /* Loop over all the words allocated on the stack for this arg. */
3735 /* We can do it by words, because any scalar bigger than a word
3736 has a size a multiple of a word. */
3737 #ifndef PUSH_ARGS_REVERSED
3738 for (i = not_stack; i < size; i++)
3740 for (i = size - 1; i >= not_stack; i--)
3742 if (i >= not_stack + offset)
3743 emit_push_insn (operand_subword_force (x, i, mode),
3744 word_mode, NULL_TREE, NULL_RTX, align, 0, NULL_RTX,
3746 GEN_INT (args_offset + ((i - not_stack + skip)
3748 reg_parm_stack_space, alignment_pad);
3755 /* Push padding now if padding above and stack grows down,
3756 or if padding below and stack grows up.
3757 But if space already allocated, this has already been done. */
3758 if (extra && args_addr == 0
3759 && where_pad != none && where_pad != stack_direction)
3760 anti_adjust_stack (GEN_INT (extra));
3762 #ifdef PUSH_ROUNDING
3763 if (args_addr == 0 && PUSH_ARGS)
3764 emit_single_push_insn (mode, x, type);
3768 if (GET_CODE (args_so_far) == CONST_INT)
3770 = memory_address (mode,
3771 plus_constant (args_addr,
3772 INTVAL (args_so_far)));
3774 addr = memory_address (mode, gen_rtx_PLUS (Pmode, args_addr,
3776 dest = gen_rtx_MEM (mode, addr);
3778 /* We do *not* set_mem_attributes here, because incoming arguments
3779 may overlap with sibling call outgoing arguments and we cannot
3780 allow reordering of reads from function arguments with stores
3781 to outgoing arguments of sibling calls. We do, however, want
3782 to record the alignment of the stack slot. */
3783 /* ALIGN may well be better aligned than TYPE, e.g. due to
3784 PARM_BOUNDARY. Assume the caller isn't lying. */
3785 set_mem_align (dest, align);
3787 emit_move_insn (dest, x);
3791 /* If part should go in registers, copy that part
3792 into the appropriate registers. Do this now, at the end,
3793 since mem-to-mem copies above may do function calls. */
3794 if (partial > 0 && reg != 0)
3796 /* Handle calls that pass values in multiple non-contiguous locations.
3797 The Irix 6 ABI has examples of this. */
3798 if (GET_CODE (reg) == PARALLEL)
3799 emit_group_load (reg, x, type, -1);
3802 gcc_assert (partial % UNITS_PER_WORD == 0);
3803 move_block_to_reg (REGNO (reg), x, partial / UNITS_PER_WORD, mode);
3807 if (extra && args_addr == 0 && where_pad == stack_direction)
3808 anti_adjust_stack (GEN_INT (extra));
3810 if (alignment_pad && args_addr == 0)
3811 anti_adjust_stack (alignment_pad);
3814 /* Return X if X can be used as a subtarget in a sequence of arithmetic
3818 get_subtarget (rtx x)
3822 /* Only registers can be subtargets. */
3824 /* Don't use hard regs to avoid extending their life. */
3825 || REGNO (x) < FIRST_PSEUDO_REGISTER
3829 /* A subroutine of expand_assignment. Optimize FIELD op= VAL, where
3830 FIELD is a bitfield. Returns true if the optimization was successful,
3831 and there's nothing else to do. */
3834 optimize_bitfield_assignment_op (unsigned HOST_WIDE_INT bitsize,
3835 unsigned HOST_WIDE_INT bitpos,
3836 enum machine_mode mode1, rtx str_rtx,
3839 enum machine_mode str_mode = GET_MODE (str_rtx);
3840 unsigned int str_bitsize = GET_MODE_BITSIZE (str_mode);
3845 if (mode1 != VOIDmode
3846 || bitsize >= BITS_PER_WORD
3847 || str_bitsize > BITS_PER_WORD
3848 || TREE_SIDE_EFFECTS (to)
3849 || TREE_THIS_VOLATILE (to))
3853 if (!BINARY_CLASS_P (src)
3854 || TREE_CODE (TREE_TYPE (src)) != INTEGER_TYPE)
3857 op0 = TREE_OPERAND (src, 0);
3858 op1 = TREE_OPERAND (src, 1);
3861 if (!operand_equal_p (to, op0, 0))
3864 if (MEM_P (str_rtx))
3866 unsigned HOST_WIDE_INT offset1;
3868 if (str_bitsize == 0 || str_bitsize > BITS_PER_WORD)
3869 str_mode = word_mode;
3870 str_mode = get_best_mode (bitsize, bitpos,
3871 MEM_ALIGN (str_rtx), str_mode, 0);
3872 if (str_mode == VOIDmode)
3874 str_bitsize = GET_MODE_BITSIZE (str_mode);
3877 bitpos %= str_bitsize;
3878 offset1 = (offset1 - bitpos) / BITS_PER_UNIT;
3879 str_rtx = adjust_address (str_rtx, str_mode, offset1);
3881 else if (!REG_P (str_rtx) && GET_CODE (str_rtx) != SUBREG)
3884 /* If the bit field covers the whole REG/MEM, store_field
3885 will likely generate better code. */
3886 if (bitsize >= str_bitsize)
3889 /* We can't handle fields split across multiple entities. */
3890 if (bitpos + bitsize > str_bitsize)
3893 if (BYTES_BIG_ENDIAN)
3894 bitpos = str_bitsize - bitpos - bitsize;
3896 switch (TREE_CODE (src))
3900 /* For now, just optimize the case of the topmost bitfield
3901 where we don't need to do any masking and also
3902 1 bit bitfields where xor can be used.
3903 We might win by one instruction for the other bitfields
3904 too if insv/extv instructions aren't used, so that
3905 can be added later. */
3906 if (bitpos + bitsize != str_bitsize
3907 && (bitsize != 1 || TREE_CODE (op1) != INTEGER_CST))
3910 value = expand_expr (op1, NULL_RTX, str_mode, 0);
3911 value = convert_modes (str_mode,
3912 TYPE_MODE (TREE_TYPE (op1)), value,
3913 TYPE_UNSIGNED (TREE_TYPE (op1)));
3915 /* We may be accessing data outside the field, which means
3916 we can alias adjacent data. */
3917 if (MEM_P (str_rtx))
3919 str_rtx = shallow_copy_rtx (str_rtx);
3920 set_mem_alias_set (str_rtx, 0);
3921 set_mem_expr (str_rtx, 0);
3924 binop = TREE_CODE (src) == PLUS_EXPR ? add_optab : sub_optab;
3925 if (bitsize == 1 && bitpos + bitsize != str_bitsize)
3927 value = expand_and (str_mode, value, const1_rtx, NULL);
3930 value = expand_shift (LSHIFT_EXPR, str_mode, value,
3931 build_int_cst (NULL_TREE, bitpos),
3933 result = expand_binop (str_mode, binop, str_rtx,
3934 value, str_rtx, 1, OPTAB_WIDEN);
3935 if (result != str_rtx)
3936 emit_move_insn (str_rtx, result);
3941 if (TREE_CODE (op1) != INTEGER_CST)
3943 value = expand_expr (op1, NULL_RTX, GET_MODE (str_rtx), 0);
3944 value = convert_modes (GET_MODE (str_rtx),
3945 TYPE_MODE (TREE_TYPE (op1)), value,
3946 TYPE_UNSIGNED (TREE_TYPE (op1)));
3948 /* We may be accessing data outside the field, which means
3949 we can alias adjacent data. */
3950 if (MEM_P (str_rtx))
3952 str_rtx = shallow_copy_rtx (str_rtx);
3953 set_mem_alias_set (str_rtx, 0);
3954 set_mem_expr (str_rtx, 0);
3957 binop = TREE_CODE (src) == BIT_IOR_EXPR ? ior_optab : xor_optab;
3958 if (bitpos + bitsize != GET_MODE_BITSIZE (GET_MODE (str_rtx)))
3960 rtx mask = GEN_INT (((unsigned HOST_WIDE_INT) 1 << bitsize)
3962 value = expand_and (GET_MODE (str_rtx), value, mask,
3965 value = expand_shift (LSHIFT_EXPR, GET_MODE (str_rtx), value,
3966 build_int_cst (NULL_TREE, bitpos),
3968 result = expand_binop (GET_MODE (str_rtx), binop, str_rtx,
3969 value, str_rtx, 1, OPTAB_WIDEN);
3970 if (result != str_rtx)
3971 emit_move_insn (str_rtx, result);
3982 /* Expand an assignment that stores the value of FROM into TO. */
3985 expand_assignment (tree to, tree from)
3990 /* Don't crash if the lhs of the assignment was erroneous. */
3991 if (TREE_CODE (to) == ERROR_MARK)
3993 result = expand_normal (from);
3997 /* Optimize away no-op moves without side-effects. */
3998 if (operand_equal_p (to, from, 0))
4001 /* Assignment of a structure component needs special treatment
4002 if the structure component's rtx is not simply a MEM.
4003 Assignment of an array element at a constant index, and assignment of
4004 an array element in an unaligned packed structure field, has the same
4006 if (handled_component_p (to)
4007 || TREE_CODE (TREE_TYPE (to)) == ARRAY_TYPE)
4009 enum machine_mode mode1;
4010 HOST_WIDE_INT bitsize, bitpos;
4017 tem = get_inner_reference (to, &bitsize, &bitpos, &offset, &mode1,
4018 &unsignedp, &volatilep, true);
4020 /* If we are going to use store_bit_field and extract_bit_field,
4021 make sure to_rtx will be safe for multiple use. */
4023 to_rtx = expand_normal (tem);
4029 if (!MEM_P (to_rtx))
4031 /* We can get constant negative offsets into arrays with broken
4032 user code. Translate this to a trap instead of ICEing. */
4033 gcc_assert (TREE_CODE (offset) == INTEGER_CST);
4034 expand_builtin_trap ();
4035 to_rtx = gen_rtx_MEM (BLKmode, const0_rtx);
4038 offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, EXPAND_SUM);
4039 #ifdef POINTERS_EXTEND_UNSIGNED
4040 if (GET_MODE (offset_rtx) != Pmode)
4041 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
4043 if (GET_MODE (offset_rtx) != ptr_mode)
4044 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
4047 /* A constant address in TO_RTX can have VOIDmode, we must not try
4048 to call force_reg for that case. Avoid that case. */
4050 && GET_MODE (to_rtx) == BLKmode
4051 && GET_MODE (XEXP (to_rtx, 0)) != VOIDmode
4053 && (bitpos % bitsize) == 0
4054 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
4055 && MEM_ALIGN (to_rtx) == GET_MODE_ALIGNMENT (mode1))
4057 to_rtx = adjust_address (to_rtx, mode1, bitpos / BITS_PER_UNIT);
4061 to_rtx = offset_address (to_rtx, offset_rtx,
4062 highest_pow2_factor_for_target (to,
4066 /* Handle expand_expr of a complex value returning a CONCAT. */
4067 if (GET_CODE (to_rtx) == CONCAT)
4069 if (TREE_CODE (TREE_TYPE (from)) == COMPLEX_TYPE)
4071 gcc_assert (bitpos == 0);
4072 result = store_expr (from, to_rtx, false);
4076 gcc_assert (bitpos == 0 || bitpos == GET_MODE_BITSIZE (mode1));
4077 result = store_expr (from, XEXP (to_rtx, bitpos != 0), false);
4084 /* If the field is at offset zero, we could have been given the
4085 DECL_RTX of the parent struct. Don't munge it. */
4086 to_rtx = shallow_copy_rtx (to_rtx);
4088 set_mem_attributes_minus_bitpos (to_rtx, to, 0, bitpos);
4090 /* Deal with volatile and readonly fields. The former is only
4091 done for MEM. Also set MEM_KEEP_ALIAS_SET_P if needed. */
4093 MEM_VOLATILE_P (to_rtx) = 1;
4094 if (component_uses_parent_alias_set (to))
4095 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
4098 if (optimize_bitfield_assignment_op (bitsize, bitpos, mode1,
4102 result = store_field (to_rtx, bitsize, bitpos, mode1, from,
4103 TREE_TYPE (tem), get_alias_set (to));
4107 preserve_temp_slots (result);
4113 /* If the rhs is a function call and its value is not an aggregate,
4114 call the function before we start to compute the lhs.
4115 This is needed for correct code for cases such as
4116 val = setjmp (buf) on machines where reference to val
4117 requires loading up part of an address in a separate insn.
4119 Don't do this if TO is a VAR_DECL or PARM_DECL whose DECL_RTL is REG
4120 since it might be a promoted variable where the zero- or sign- extension
4121 needs to be done. Handling this in the normal way is safe because no
4122 computation is done before the call. */
4123 if (TREE_CODE (from) == CALL_EXPR && ! aggregate_value_p (from, from)
4124 && TREE_CODE (TYPE_SIZE (TREE_TYPE (from))) == INTEGER_CST
4125 && ! ((TREE_CODE (to) == VAR_DECL || TREE_CODE (to) == PARM_DECL)
4126 && REG_P (DECL_RTL (to))))
4131 value = expand_normal (from);
4133 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4135 /* Handle calls that return values in multiple non-contiguous locations.
4136 The Irix 6 ABI has examples of this. */
4137 if (GET_CODE (to_rtx) == PARALLEL)
4138 emit_group_load (to_rtx, value, TREE_TYPE (from),
4139 int_size_in_bytes (TREE_TYPE (from)));
4140 else if (GET_MODE (to_rtx) == BLKmode)
4141 emit_block_move (to_rtx, value, expr_size (from), BLOCK_OP_NORMAL);
4144 if (POINTER_TYPE_P (TREE_TYPE (to)))
4145 value = convert_memory_address (GET_MODE (to_rtx), value);
4146 emit_move_insn (to_rtx, value);
4148 preserve_temp_slots (to_rtx);
4154 /* Ordinary treatment. Expand TO to get a REG or MEM rtx.
4155 Don't re-expand if it was expanded already (in COMPONENT_REF case). */
4158 to_rtx = expand_expr (to, NULL_RTX, VOIDmode, EXPAND_WRITE);
4160 /* Don't move directly into a return register. */
4161 if (TREE_CODE (to) == RESULT_DECL
4162 && (REG_P (to_rtx) || GET_CODE (to_rtx) == PARALLEL))
4167 temp = expand_expr (from, 0, GET_MODE (to_rtx), 0);
4169 if (GET_CODE (to_rtx) == PARALLEL)
4170 emit_group_load (to_rtx, temp, TREE_TYPE (from),
4171 int_size_in_bytes (TREE_TYPE (from)));
4173 emit_move_insn (to_rtx, temp);
4175 preserve_temp_slots (to_rtx);
4181 /* In case we are returning the contents of an object which overlaps
4182 the place the value is being stored, use a safe function when copying
4183 a value through a pointer into a structure value return block. */
4184 if (TREE_CODE (to) == RESULT_DECL && TREE_CODE (from) == INDIRECT_REF
4185 && current_function_returns_struct
4186 && !current_function_returns_pcc_struct)
4191 size = expr_size (from);
4192 from_rtx = expand_normal (from);
4194 emit_library_call (memmove_libfunc, LCT_NORMAL,
4195 VOIDmode, 3, XEXP (to_rtx, 0), Pmode,
4196 XEXP (from_rtx, 0), Pmode,
4197 convert_to_mode (TYPE_MODE (sizetype),
4198 size, TYPE_UNSIGNED (sizetype)),
4199 TYPE_MODE (sizetype));
4201 preserve_temp_slots (to_rtx);
4207 /* Compute FROM and store the value in the rtx we got. */
4210 result = store_expr (from, to_rtx, 0);
4211 preserve_temp_slots (result);
4217 /* Generate code for computing expression EXP,
4218 and storing the value into TARGET.
4220 If the mode is BLKmode then we may return TARGET itself.
4221 It turns out that in BLKmode it doesn't cause a problem.
4222 because C has no operators that could combine two different
4223 assignments into the same BLKmode object with different values
4224 with no sequence point. Will other languages need this to
4227 If CALL_PARAM_P is nonzero, this is a store into a call param on the
4228 stack, and block moves may need to be treated specially. */
4231 store_expr (tree exp, rtx target, int call_param_p)
4234 rtx alt_rtl = NULL_RTX;
4235 int dont_return_target = 0;
4237 if (VOID_TYPE_P (TREE_TYPE (exp)))
4239 /* C++ can generate ?: expressions with a throw expression in one
4240 branch and an rvalue in the other. Here, we resolve attempts to
4241 store the throw expression's nonexistent result. */
4242 gcc_assert (!call_param_p);
4243 expand_expr (exp, const0_rtx, VOIDmode, 0);
4246 if (TREE_CODE (exp) == COMPOUND_EXPR)
4248 /* Perform first part of compound expression, then assign from second
4250 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
4251 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4252 return store_expr (TREE_OPERAND (exp, 1), target, call_param_p);
4254 else if (TREE_CODE (exp) == COND_EXPR && GET_MODE (target) == BLKmode)
4256 /* For conditional expression, get safe form of the target. Then
4257 test the condition, doing the appropriate assignment on either
4258 side. This avoids the creation of unnecessary temporaries.
4259 For non-BLKmode, it is more efficient not to do this. */
4261 rtx lab1 = gen_label_rtx (), lab2 = gen_label_rtx ();
4263 do_pending_stack_adjust ();
4265 jumpifnot (TREE_OPERAND (exp, 0), lab1);
4266 store_expr (TREE_OPERAND (exp, 1), target, call_param_p);
4267 emit_jump_insn (gen_jump (lab2));
4270 store_expr (TREE_OPERAND (exp, 2), target, call_param_p);
4276 else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
4277 /* If this is a scalar in a register that is stored in a wider mode
4278 than the declared mode, compute the result into its declared mode
4279 and then convert to the wider mode. Our value is the computed
4282 rtx inner_target = 0;
4284 /* We can do the conversion inside EXP, which will often result
4285 in some optimizations. Do the conversion in two steps: first
4286 change the signedness, if needed, then the extend. But don't
4287 do this if the type of EXP is a subtype of something else
4288 since then the conversion might involve more than just
4289 converting modes. */
4290 if (INTEGRAL_TYPE_P (TREE_TYPE (exp))
4291 && TREE_TYPE (TREE_TYPE (exp)) == 0
4292 && (!lang_hooks.reduce_bit_field_operations
4293 || (GET_MODE_PRECISION (GET_MODE (target))
4294 == TYPE_PRECISION (TREE_TYPE (exp)))))
4296 if (TYPE_UNSIGNED (TREE_TYPE (exp))
4297 != SUBREG_PROMOTED_UNSIGNED_P (target))
4299 (lang_hooks.types.signed_or_unsigned_type
4300 (SUBREG_PROMOTED_UNSIGNED_P (target), TREE_TYPE (exp)), exp);
4302 exp = fold_convert (lang_hooks.types.type_for_mode
4303 (GET_MODE (SUBREG_REG (target)),
4304 SUBREG_PROMOTED_UNSIGNED_P (target)),
4307 inner_target = SUBREG_REG (target);
4310 temp = expand_expr (exp, inner_target, VOIDmode,
4311 call_param_p ? EXPAND_STACK_PARM : EXPAND_NORMAL);
4313 /* If TEMP is a VOIDmode constant, use convert_modes to make
4314 sure that we properly convert it. */
4315 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
4317 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4318 temp, SUBREG_PROMOTED_UNSIGNED_P (target));
4319 temp = convert_modes (GET_MODE (SUBREG_REG (target)),
4320 GET_MODE (target), temp,
4321 SUBREG_PROMOTED_UNSIGNED_P (target));
4324 convert_move (SUBREG_REG (target), temp,
4325 SUBREG_PROMOTED_UNSIGNED_P (target));
4331 temp = expand_expr_real (exp, target, GET_MODE (target),
4333 ? EXPAND_STACK_PARM : EXPAND_NORMAL),
4335 /* Return TARGET if it's a specified hardware register.
4336 If TARGET is a volatile mem ref, either return TARGET
4337 or return a reg copied *from* TARGET; ANSI requires this.
4339 Otherwise, if TEMP is not TARGET, return TEMP
4340 if it is constant (for efficiency),
4341 or if we really want the correct value. */
4342 if (!(target && REG_P (target)
4343 && REGNO (target) < FIRST_PSEUDO_REGISTER)
4344 && !(MEM_P (target) && MEM_VOLATILE_P (target))
4345 && ! rtx_equal_p (temp, target)
4346 && CONSTANT_P (temp))
4347 dont_return_target = 1;
4350 /* If TEMP is a VOIDmode constant and the mode of the type of EXP is not
4351 the same as that of TARGET, adjust the constant. This is needed, for
4352 example, in case it is a CONST_DOUBLE and we want only a word-sized
4354 if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode
4355 && TREE_CODE (exp) != ERROR_MARK
4356 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
4357 temp = convert_modes (GET_MODE (target), TYPE_MODE (TREE_TYPE (exp)),
4358 temp, TYPE_UNSIGNED (TREE_TYPE (exp)));
4360 /* If value was not generated in the target, store it there.
4361 Convert the value to TARGET's type first if necessary and emit the
4362 pending incrementations that have been queued when expanding EXP.
4363 Note that we cannot emit the whole queue blindly because this will
4364 effectively disable the POST_INC optimization later.
4366 If TEMP and TARGET compare equal according to rtx_equal_p, but
4367 one or both of them are volatile memory refs, we have to distinguish
4369 - expand_expr has used TARGET. In this case, we must not generate
4370 another copy. This can be detected by TARGET being equal according
4372 - expand_expr has not used TARGET - that means that the source just
4373 happens to have the same RTX form. Since temp will have been created
4374 by expand_expr, it will compare unequal according to == .
4375 We must generate a copy in this case, to reach the correct number
4376 of volatile memory references. */
4378 if ((! rtx_equal_p (temp, target)
4379 || (temp != target && (side_effects_p (temp)
4380 || side_effects_p (target))))
4381 && TREE_CODE (exp) != ERROR_MARK
4382 /* If store_expr stores a DECL whose DECL_RTL(exp) == TARGET,
4383 but TARGET is not valid memory reference, TEMP will differ
4384 from TARGET although it is really the same location. */
4385 && !(alt_rtl && rtx_equal_p (alt_rtl, target))
4386 /* If there's nothing to copy, don't bother. Don't call
4387 expr_size unless necessary, because some front-ends (C++)
4388 expr_size-hook must not be given objects that are not
4389 supposed to be bit-copied or bit-initialized. */
4390 && expr_size (exp) != const0_rtx)
4392 if (GET_MODE (temp) != GET_MODE (target)
4393 && GET_MODE (temp) != VOIDmode)
4395 int unsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
4396 if (dont_return_target)
4398 /* In this case, we will return TEMP,
4399 so make sure it has the proper mode.
4400 But don't forget to store the value into TARGET. */
4401 temp = convert_to_mode (GET_MODE (target), temp, unsignedp);
4402 emit_move_insn (target, temp);
4405 convert_move (target, temp, unsignedp);
4408 else if (GET_MODE (temp) == BLKmode && TREE_CODE (exp) == STRING_CST)
4410 /* Handle copying a string constant into an array. The string
4411 constant may be shorter than the array. So copy just the string's
4412 actual length, and clear the rest. First get the size of the data
4413 type of the string, which is actually the size of the target. */
4414 rtx size = expr_size (exp);
4416 if (GET_CODE (size) == CONST_INT
4417 && INTVAL (size) < TREE_STRING_LENGTH (exp))
4418 emit_block_move (target, temp, size,
4420 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4423 /* Compute the size of the data to copy from the string. */
4425 = size_binop (MIN_EXPR,
4426 make_tree (sizetype, size),
4427 size_int (TREE_STRING_LENGTH (exp)));
4429 = expand_expr (copy_size, NULL_RTX, VOIDmode,
4431 ? EXPAND_STACK_PARM : EXPAND_NORMAL));
4434 /* Copy that much. */
4435 copy_size_rtx = convert_to_mode (ptr_mode, copy_size_rtx,
4436 TYPE_UNSIGNED (sizetype));
4437 emit_block_move (target, temp, copy_size_rtx,
4439 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4441 /* Figure out how much is left in TARGET that we have to clear.
4442 Do all calculations in ptr_mode. */
4443 if (GET_CODE (copy_size_rtx) == CONST_INT)
4445 size = plus_constant (size, -INTVAL (copy_size_rtx));
4446 target = adjust_address (target, BLKmode,
4447 INTVAL (copy_size_rtx));
4451 size = expand_binop (TYPE_MODE (sizetype), sub_optab, size,
4452 copy_size_rtx, NULL_RTX, 0,
4455 #ifdef POINTERS_EXTEND_UNSIGNED
4456 if (GET_MODE (copy_size_rtx) != Pmode)
4457 copy_size_rtx = convert_to_mode (Pmode, copy_size_rtx,
4458 TYPE_UNSIGNED (sizetype));
4461 target = offset_address (target, copy_size_rtx,
4462 highest_pow2_factor (copy_size));
4463 label = gen_label_rtx ();
4464 emit_cmp_and_jump_insns (size, const0_rtx, LT, NULL_RTX,
4465 GET_MODE (size), 0, label);
4468 if (size != const0_rtx)
4469 clear_storage (target, size, BLOCK_OP_NORMAL);
4475 /* Handle calls that return values in multiple non-contiguous locations.
4476 The Irix 6 ABI has examples of this. */
4477 else if (GET_CODE (target) == PARALLEL)
4478 emit_group_load (target, temp, TREE_TYPE (exp),
4479 int_size_in_bytes (TREE_TYPE (exp)));
4480 else if (GET_MODE (temp) == BLKmode)
4481 emit_block_move (target, temp, expr_size (exp),
4483 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
4486 temp = force_operand (temp, target);
4488 emit_move_insn (target, temp);
4495 /* Examine CTOR to discover:
4496 * how many scalar fields are set to nonzero values,
4497 and place it in *P_NZ_ELTS;
4498 * how many scalar fields are set to non-constant values,
4499 and place it in *P_NC_ELTS; and
4500 * how many scalar fields in total are in CTOR,
4501 and place it in *P_ELT_COUNT.
4502 * if a type is a union, and the initializer from the constructor
4503 is not the largest element in the union, then set *p_must_clear. */
4506 categorize_ctor_elements_1 (tree ctor, HOST_WIDE_INT *p_nz_elts,
4507 HOST_WIDE_INT *p_nc_elts,
4508 HOST_WIDE_INT *p_elt_count,
4511 unsigned HOST_WIDE_INT idx;
4512 HOST_WIDE_INT nz_elts, nc_elts, elt_count;
4513 tree value, purpose;
4519 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), idx, purpose, value)
4524 if (TREE_CODE (purpose) == RANGE_EXPR)
4526 tree lo_index = TREE_OPERAND (purpose, 0);
4527 tree hi_index = TREE_OPERAND (purpose, 1);
4529 if (host_integerp (lo_index, 1) && host_integerp (hi_index, 1))
4530 mult = (tree_low_cst (hi_index, 1)
4531 - tree_low_cst (lo_index, 1) + 1);
4534 switch (TREE_CODE (value))
4538 HOST_WIDE_INT nz = 0, nc = 0, ic = 0;
4539 categorize_ctor_elements_1 (value, &nz, &nc, &ic, p_must_clear);
4540 nz_elts += mult * nz;
4541 nc_elts += mult * nc;
4542 elt_count += mult * ic;
4548 if (!initializer_zerop (value))
4554 nz_elts += mult * TREE_STRING_LENGTH (value);
4555 elt_count += mult * TREE_STRING_LENGTH (value);
4559 if (!initializer_zerop (TREE_REALPART (value)))
4561 if (!initializer_zerop (TREE_IMAGPART (value)))
4569 for (v = TREE_VECTOR_CST_ELTS (value); v; v = TREE_CHAIN (v))
4571 if (!initializer_zerop (TREE_VALUE (v)))
4581 if (!initializer_constant_valid_p (value, TREE_TYPE (value)))
4588 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4589 || TREE_CODE (TREE_TYPE (ctor)) == QUAL_UNION_TYPE))
4592 bool clear_this = true;
4594 if (!VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)))
4596 /* We don't expect more than one element of the union to be
4597 initialized. Not sure what we should do otherwise... */
4598 gcc_assert (VEC_length (constructor_elt, CONSTRUCTOR_ELTS (ctor))
4601 init_sub_type = TREE_TYPE (VEC_index (constructor_elt,
4602 CONSTRUCTOR_ELTS (ctor),
4605 /* ??? We could look at each element of the union, and find the
4606 largest element. Which would avoid comparing the size of the
4607 initialized element against any tail padding in the union.
4608 Doesn't seem worth the effort... */
4609 if (simple_cst_equal (TYPE_SIZE (TREE_TYPE (ctor)),
4610 TYPE_SIZE (init_sub_type)) == 1)
4612 /* And now we have to find out if the element itself is fully
4613 constructed. E.g. for union { struct { int a, b; } s; } u
4614 = { .s = { .a = 1 } }. */
4615 if (elt_count == count_type_elements (init_sub_type, false))
4620 *p_must_clear = clear_this;
4623 *p_nz_elts += nz_elts;
4624 *p_nc_elts += nc_elts;
4625 *p_elt_count += elt_count;
4629 categorize_ctor_elements (tree ctor, HOST_WIDE_INT *p_nz_elts,
4630 HOST_WIDE_INT *p_nc_elts,
4631 HOST_WIDE_INT *p_elt_count,
4637 *p_must_clear = false;
4638 categorize_ctor_elements_1 (ctor, p_nz_elts, p_nc_elts, p_elt_count,
4642 /* Count the number of scalars in TYPE. Return -1 on overflow or
4643 variable-sized. If ALLOW_FLEXARR is true, don't count flexible
4644 array member at the end of the structure. */
4647 count_type_elements (tree type, bool allow_flexarr)
4649 const HOST_WIDE_INT max = ~((HOST_WIDE_INT)1 << (HOST_BITS_PER_WIDE_INT-1));
4650 switch (TREE_CODE (type))
4654 tree telts = array_type_nelts (type);
4655 if (telts && host_integerp (telts, 1))
4657 HOST_WIDE_INT n = tree_low_cst (telts, 1) + 1;
4658 HOST_WIDE_INT m = count_type_elements (TREE_TYPE (type), false);
4661 else if (max / n > m)
4669 HOST_WIDE_INT n = 0, t;
4672 for (f = TYPE_FIELDS (type); f ; f = TREE_CHAIN (f))
4673 if (TREE_CODE (f) == FIELD_DECL)
4675 t = count_type_elements (TREE_TYPE (f), false);
4678 /* Check for structures with flexible array member. */
4679 tree tf = TREE_TYPE (f);
4681 && TREE_CHAIN (f) == NULL
4682 && TREE_CODE (tf) == ARRAY_TYPE
4684 && TYPE_MIN_VALUE (TYPE_DOMAIN (tf))
4685 && integer_zerop (TYPE_MIN_VALUE (TYPE_DOMAIN (tf)))
4686 && !TYPE_MAX_VALUE (TYPE_DOMAIN (tf))
4687 && int_size_in_bytes (type) >= 0)
4699 case QUAL_UNION_TYPE:
4701 /* Ho hum. How in the world do we guess here? Clearly it isn't
4702 right to count the fields. Guess based on the number of words. */
4703 HOST_WIDE_INT n = int_size_in_bytes (type);
4706 return n / UNITS_PER_WORD;
4713 return TYPE_VECTOR_SUBPARTS (type);
4721 case REFERENCE_TYPE:
4733 /* Return 1 if EXP contains mostly (3/4) zeros. */
4736 mostly_zeros_p (tree exp)
4738 if (TREE_CODE (exp) == CONSTRUCTOR)
4741 HOST_WIDE_INT nz_elts, nc_elts, count, elts;
4744 categorize_ctor_elements (exp, &nz_elts, &nc_elts, &count, &must_clear);
4748 elts = count_type_elements (TREE_TYPE (exp), false);
4750 return nz_elts < elts / 4;
4753 return initializer_zerop (exp);
4756 /* Return 1 if EXP contains all zeros. */
4759 all_zeros_p (tree exp)
4761 if (TREE_CODE (exp) == CONSTRUCTOR)
4764 HOST_WIDE_INT nz_elts, nc_elts, count;
4767 categorize_ctor_elements (exp, &nz_elts, &nc_elts, &count, &must_clear);
4768 return nz_elts == 0;
4771 return initializer_zerop (exp);
4774 /* Helper function for store_constructor.
4775 TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
4776 TYPE is the type of the CONSTRUCTOR, not the element type.
4777 CLEARED is as for store_constructor.
4778 ALIAS_SET is the alias set to use for any stores.
4780 This provides a recursive shortcut back to store_constructor when it isn't
4781 necessary to go through store_field. This is so that we can pass through
4782 the cleared field to let store_constructor know that we may not have to
4783 clear a substructure if the outer structure has already been cleared. */
4786 store_constructor_field (rtx target, unsigned HOST_WIDE_INT bitsize,
4787 HOST_WIDE_INT bitpos, enum machine_mode mode,
4788 tree exp, tree type, int cleared, int alias_set)
4790 if (TREE_CODE (exp) == CONSTRUCTOR
4791 /* We can only call store_constructor recursively if the size and
4792 bit position are on a byte boundary. */
4793 && bitpos % BITS_PER_UNIT == 0
4794 && (bitsize > 0 && bitsize % BITS_PER_UNIT == 0)
4795 /* If we have a nonzero bitpos for a register target, then we just
4796 let store_field do the bitfield handling. This is unlikely to
4797 generate unnecessary clear instructions anyways. */
4798 && (bitpos == 0 || MEM_P (target)))
4802 = adjust_address (target,
4803 GET_MODE (target) == BLKmode
4805 % GET_MODE_ALIGNMENT (GET_MODE (target)))
4806 ? BLKmode : VOIDmode, bitpos / BITS_PER_UNIT);
4809 /* Update the alias set, if required. */
4810 if (MEM_P (target) && ! MEM_KEEP_ALIAS_SET_P (target)
4811 && MEM_ALIAS_SET (target) != 0)
4813 target = copy_rtx (target);
4814 set_mem_alias_set (target, alias_set);
4817 store_constructor (exp, target, cleared, bitsize / BITS_PER_UNIT);
4820 store_field (target, bitsize, bitpos, mode, exp, type, alias_set);
4823 /* Store the value of constructor EXP into the rtx TARGET.
4824 TARGET is either a REG or a MEM; we know it cannot conflict, since
4825 safe_from_p has been called.
4826 CLEARED is true if TARGET is known to have been zero'd.
4827 SIZE is the number of bytes of TARGET we are allowed to modify: this
4828 may not be the same as the size of EXP if we are assigning to a field
4829 which has been packed to exclude padding bits. */
4832 store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size)
4834 tree type = TREE_TYPE (exp);
4835 #ifdef WORD_REGISTER_OPERATIONS
4836 HOST_WIDE_INT exp_size = int_size_in_bytes (type);
4839 switch (TREE_CODE (type))
4843 case QUAL_UNION_TYPE:
4845 unsigned HOST_WIDE_INT idx;
4848 /* If size is zero or the target is already cleared, do nothing. */
4849 if (size == 0 || cleared)
4851 /* We either clear the aggregate or indicate the value is dead. */
4852 else if ((TREE_CODE (type) == UNION_TYPE
4853 || TREE_CODE (type) == QUAL_UNION_TYPE)
4854 && ! CONSTRUCTOR_ELTS (exp))
4855 /* If the constructor is empty, clear the union. */
4857 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
4861 /* If we are building a static constructor into a register,
4862 set the initial value as zero so we can fold the value into
4863 a constant. But if more than one register is involved,
4864 this probably loses. */
4865 else if (REG_P (target) && TREE_STATIC (exp)
4866 && GET_MODE_SIZE (GET_MODE (target)) <= UNITS_PER_WORD)
4868 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
4872 /* If the constructor has fewer fields than the structure or
4873 if we are initializing the structure to mostly zeros, clear
4874 the whole structure first. Don't do this if TARGET is a
4875 register whose mode size isn't equal to SIZE since
4876 clear_storage can't handle this case. */
4878 && (((int)VEC_length (constructor_elt, CONSTRUCTOR_ELTS (exp))
4879 != fields_length (type))
4880 || mostly_zeros_p (exp))
4882 || ((HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (target))
4885 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
4890 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
4892 /* Store each element of the constructor into the
4893 corresponding field of TARGET. */
4894 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, field, value)
4896 enum machine_mode mode;
4897 HOST_WIDE_INT bitsize;
4898 HOST_WIDE_INT bitpos = 0;
4900 rtx to_rtx = target;
4902 /* Just ignore missing fields. We cleared the whole
4903 structure, above, if any fields are missing. */
4907 if (cleared && initializer_zerop (value))
4910 if (host_integerp (DECL_SIZE (field), 1))
4911 bitsize = tree_low_cst (DECL_SIZE (field), 1);
4915 mode = DECL_MODE (field);
4916 if (DECL_BIT_FIELD (field))
4919 offset = DECL_FIELD_OFFSET (field);
4920 if (host_integerp (offset, 0)
4921 && host_integerp (bit_position (field), 0))
4923 bitpos = int_bit_position (field);
4927 bitpos = tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 0);
4934 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (offset,
4935 make_tree (TREE_TYPE (exp),
4938 offset_rtx = expand_normal (offset);
4939 gcc_assert (MEM_P (to_rtx));
4941 #ifdef POINTERS_EXTEND_UNSIGNED
4942 if (GET_MODE (offset_rtx) != Pmode)
4943 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
4945 if (GET_MODE (offset_rtx) != ptr_mode)
4946 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
4949 to_rtx = offset_address (to_rtx, offset_rtx,
4950 highest_pow2_factor (offset));
4953 #ifdef WORD_REGISTER_OPERATIONS
4954 /* If this initializes a field that is smaller than a
4955 word, at the start of a word, try to widen it to a full
4956 word. This special case allows us to output C++ member
4957 function initializations in a form that the optimizers
4960 && bitsize < BITS_PER_WORD
4961 && bitpos % BITS_PER_WORD == 0
4962 && GET_MODE_CLASS (mode) == MODE_INT
4963 && TREE_CODE (value) == INTEGER_CST
4965 && bitpos + BITS_PER_WORD <= exp_size * BITS_PER_UNIT)
4967 tree type = TREE_TYPE (value);
4969 if (TYPE_PRECISION (type) < BITS_PER_WORD)
4971 type = lang_hooks.types.type_for_size
4972 (BITS_PER_WORD, TYPE_UNSIGNED (type));
4973 value = fold_convert (type, value);
4976 if (BYTES_BIG_ENDIAN)
4978 = fold_build2 (LSHIFT_EXPR, type, value,
4979 build_int_cst (type,
4980 BITS_PER_WORD - bitsize));
4981 bitsize = BITS_PER_WORD;
4986 if (MEM_P (to_rtx) && !MEM_KEEP_ALIAS_SET_P (to_rtx)
4987 && DECL_NONADDRESSABLE_P (field))
4989 to_rtx = copy_rtx (to_rtx);
4990 MEM_KEEP_ALIAS_SET_P (to_rtx) = 1;
4993 store_constructor_field (to_rtx, bitsize, bitpos, mode,
4994 value, type, cleared,
4995 get_alias_set (TREE_TYPE (field)));
5002 unsigned HOST_WIDE_INT i;
5005 tree elttype = TREE_TYPE (type);
5007 HOST_WIDE_INT minelt = 0;
5008 HOST_WIDE_INT maxelt = 0;
5010 domain = TYPE_DOMAIN (type);
5011 const_bounds_p = (TYPE_MIN_VALUE (domain)
5012 && TYPE_MAX_VALUE (domain)
5013 && host_integerp (TYPE_MIN_VALUE (domain), 0)
5014 && host_integerp (TYPE_MAX_VALUE (domain), 0));
5016 /* If we have constant bounds for the range of the type, get them. */
5019 minelt = tree_low_cst (TYPE_MIN_VALUE (domain), 0);
5020 maxelt = tree_low_cst (TYPE_MAX_VALUE (domain), 0);
5023 /* If the constructor has fewer elements than the array, clear
5024 the whole array first. Similarly if this is static
5025 constructor of a non-BLKmode object. */
5028 else if (REG_P (target) && TREE_STATIC (exp))
5032 unsigned HOST_WIDE_INT idx;
5034 HOST_WIDE_INT count = 0, zero_count = 0;
5035 need_to_clear = ! const_bounds_p;
5037 /* This loop is a more accurate version of the loop in
5038 mostly_zeros_p (it handles RANGE_EXPR in an index). It
5039 is also needed to check for missing elements. */
5040 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, index, value)
5042 HOST_WIDE_INT this_node_count;
5047 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5049 tree lo_index = TREE_OPERAND (index, 0);
5050 tree hi_index = TREE_OPERAND (index, 1);
5052 if (! host_integerp (lo_index, 1)
5053 || ! host_integerp (hi_index, 1))
5059 this_node_count = (tree_low_cst (hi_index, 1)
5060 - tree_low_cst (lo_index, 1) + 1);
5063 this_node_count = 1;
5065 count += this_node_count;
5066 if (mostly_zeros_p (value))
5067 zero_count += this_node_count;
5070 /* Clear the entire array first if there are any missing
5071 elements, or if the incidence of zero elements is >=
5074 && (count < maxelt - minelt + 1
5075 || 4 * zero_count >= 3 * count))
5079 if (need_to_clear && size > 0)
5082 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5084 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5088 if (!cleared && REG_P (target))
5089 /* Inform later passes that the old value is dead. */
5090 emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
5092 /* Store each element of the constructor into the
5093 corresponding element of TARGET, determined by counting the
5095 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), i, index, value)
5097 enum machine_mode mode;
5098 HOST_WIDE_INT bitsize;
5099 HOST_WIDE_INT bitpos;
5101 rtx xtarget = target;
5103 if (cleared && initializer_zerop (value))
5106 unsignedp = TYPE_UNSIGNED (elttype);
5107 mode = TYPE_MODE (elttype);
5108 if (mode == BLKmode)
5109 bitsize = (host_integerp (TYPE_SIZE (elttype), 1)
5110 ? tree_low_cst (TYPE_SIZE (elttype), 1)
5113 bitsize = GET_MODE_BITSIZE (mode);
5115 if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
5117 tree lo_index = TREE_OPERAND (index, 0);
5118 tree hi_index = TREE_OPERAND (index, 1);
5119 rtx index_r, pos_rtx;
5120 HOST_WIDE_INT lo, hi, count;
5123 /* If the range is constant and "small", unroll the loop. */
5125 && host_integerp (lo_index, 0)
5126 && host_integerp (hi_index, 0)
5127 && (lo = tree_low_cst (lo_index, 0),
5128 hi = tree_low_cst (hi_index, 0),
5129 count = hi - lo + 1,
5132 || (host_integerp (TYPE_SIZE (elttype), 1)
5133 && (tree_low_cst (TYPE_SIZE (elttype), 1) * count
5136 lo -= minelt; hi -= minelt;
5137 for (; lo <= hi; lo++)
5139 bitpos = lo * tree_low_cst (TYPE_SIZE (elttype), 0);
5142 && !MEM_KEEP_ALIAS_SET_P (target)
5143 && TREE_CODE (type) == ARRAY_TYPE
5144 && TYPE_NONALIASED_COMPONENT (type))
5146 target = copy_rtx (target);
5147 MEM_KEEP_ALIAS_SET_P (target) = 1;
5150 store_constructor_field
5151 (target, bitsize, bitpos, mode, value, type, cleared,
5152 get_alias_set (elttype));
5157 rtx loop_start = gen_label_rtx ();
5158 rtx loop_end = gen_label_rtx ();
5161 expand_normal (hi_index);
5162 unsignedp = TYPE_UNSIGNED (domain);
5164 index = build_decl (VAR_DECL, NULL_TREE, domain);
5167 = gen_reg_rtx (promote_mode (domain, DECL_MODE (index),
5169 SET_DECL_RTL (index, index_r);
5170 store_expr (lo_index, index_r, 0);
5172 /* Build the head of the loop. */
5173 do_pending_stack_adjust ();
5174 emit_label (loop_start);
5176 /* Assign value to element index. */
5178 fold_convert (ssizetype,
5179 fold_build2 (MINUS_EXPR,
5182 TYPE_MIN_VALUE (domain)));
5185 size_binop (MULT_EXPR, position,
5186 fold_convert (ssizetype,
5187 TYPE_SIZE_UNIT (elttype)));
5189 pos_rtx = expand_normal (position);
5190 xtarget = offset_address (target, pos_rtx,
5191 highest_pow2_factor (position));
5192 xtarget = adjust_address (xtarget, mode, 0);
5193 if (TREE_CODE (value) == CONSTRUCTOR)
5194 store_constructor (value, xtarget, cleared,
5195 bitsize / BITS_PER_UNIT);
5197 store_expr (value, xtarget, 0);
5199 /* Generate a conditional jump to exit the loop. */
5200 exit_cond = build2 (LT_EXPR, integer_type_node,
5202 jumpif (exit_cond, loop_end);
5204 /* Update the loop counter, and jump to the head of
5206 expand_assignment (index,
5207 build2 (PLUS_EXPR, TREE_TYPE (index),
5208 index, integer_one_node));
5210 emit_jump (loop_start);
5212 /* Build the end of the loop. */
5213 emit_label (loop_end);
5216 else if ((index != 0 && ! host_integerp (index, 0))
5217 || ! host_integerp (TYPE_SIZE (elttype), 1))
5222 index = ssize_int (1);
5225 index = fold_convert (ssizetype,
5226 fold_build2 (MINUS_EXPR,
5229 TYPE_MIN_VALUE (domain)));
5232 size_binop (MULT_EXPR, index,
5233 fold_convert (ssizetype,
5234 TYPE_SIZE_UNIT (elttype)));
5235 xtarget = offset_address (target,
5236 expand_normal (position),
5237 highest_pow2_factor (position));
5238 xtarget = adjust_address (xtarget, mode, 0);
5239 store_expr (value, xtarget, 0);
5244 bitpos = ((tree_low_cst (index, 0) - minelt)
5245 * tree_low_cst (TYPE_SIZE (elttype), 1));
5247 bitpos = (i * tree_low_cst (TYPE_SIZE (elttype), 1));
5249 if (MEM_P (target) && !MEM_KEEP_ALIAS_SET_P (target)
5250 && TREE_CODE (type) == ARRAY_TYPE
5251 && TYPE_NONALIASED_COMPONENT (type))
5253 target = copy_rtx (target);
5254 MEM_KEEP_ALIAS_SET_P (target) = 1;
5256 store_constructor_field (target, bitsize, bitpos, mode, value,
5257 type, cleared, get_alias_set (elttype));
5265 unsigned HOST_WIDE_INT idx;
5266 constructor_elt *ce;
5270 tree elttype = TREE_TYPE (type);
5271 int elt_size = tree_low_cst (TYPE_SIZE (elttype), 1);
5272 enum machine_mode eltmode = TYPE_MODE (elttype);
5273 HOST_WIDE_INT bitsize;
5274 HOST_WIDE_INT bitpos;
5275 rtvec vector = NULL;
5278 gcc_assert (eltmode != BLKmode);
5280 n_elts = TYPE_VECTOR_SUBPARTS (type);
5281 if (REG_P (target) && VECTOR_MODE_P (GET_MODE (target)))
5283 enum machine_mode mode = GET_MODE (target);
5285 icode = (int) vec_init_optab->handlers[mode].insn_code;
5286 if (icode != CODE_FOR_nothing)
5290 vector = rtvec_alloc (n_elts);
5291 for (i = 0; i < n_elts; i++)
5292 RTVEC_ELT (vector, i) = CONST0_RTX (GET_MODE_INNER (mode));
5296 /* If the constructor has fewer elements than the vector,
5297 clear 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 count = 0, zero_count = 0;
5308 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
5310 int n_elts_here = tree_low_cst
5311 (int_const_binop (TRUNC_DIV_EXPR,
5312 TYPE_SIZE (TREE_TYPE (value)),
5313 TYPE_SIZE (elttype), 0), 1);
5315 count += n_elts_here;
5316 if (mostly_zeros_p (value))
5317 zero_count += n_elts_here;
5320 /* Clear the entire vector first if there are any missing elements,
5321 or if the incidence of zero elements is >= 75%. */
5322 need_to_clear = (count < n_elts || 4 * zero_count >= 3 * count);
5325 if (need_to_clear && size > 0 && !vector)
5328 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5330 clear_storage (target, GEN_INT (size), BLOCK_OP_NORMAL);
5334 /* Inform later passes that the old value is dead. */
5335 if (!cleared && !vector && REG_P (target))
5336 emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
5338 /* Store each element of the constructor into the corresponding
5339 element of TARGET, determined by counting the elements. */
5340 for (idx = 0, i = 0;
5341 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
5342 idx++, i += bitsize / elt_size)
5344 HOST_WIDE_INT eltpos;
5345 tree value = ce->value;
5347 bitsize = tree_low_cst (TYPE_SIZE (TREE_TYPE (value)), 1);
5348 if (cleared && initializer_zerop (value))
5352 eltpos = tree_low_cst (ce->index, 1);
5358 /* Vector CONSTRUCTORs should only be built from smaller
5359 vectors in the case of BLKmode vectors. */
5360 gcc_assert (TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE);
5361 RTVEC_ELT (vector, eltpos)
5362 = expand_normal (value);
5366 enum machine_mode value_mode =
5367 TREE_CODE (TREE_TYPE (value)) == VECTOR_TYPE
5368 ? TYPE_MODE (TREE_TYPE (value))
5370 bitpos = eltpos * elt_size;
5371 store_constructor_field (target, bitsize, bitpos,
5372 value_mode, value, type,
5373 cleared, get_alias_set (elttype));
5378 emit_insn (GEN_FCN (icode)
5380 gen_rtx_PARALLEL (GET_MODE (target), vector)));
5389 /* Store the value of EXP (an expression tree)
5390 into a subfield of TARGET which has mode MODE and occupies
5391 BITSIZE bits, starting BITPOS bits from the start of TARGET.
5392 If MODE is VOIDmode, it means that we are storing into a bit-field.
5394 Always return const0_rtx unless we have something particular to
5397 TYPE is the type of the underlying object,
5399 ALIAS_SET is the alias set for the destination. This value will
5400 (in general) be different from that for TARGET, since TARGET is a
5401 reference to the containing structure. */
5404 store_field (rtx target, HOST_WIDE_INT bitsize, HOST_WIDE_INT bitpos,
5405 enum machine_mode mode, tree exp, tree type, int alias_set)
5407 HOST_WIDE_INT width_mask = 0;
5409 if (TREE_CODE (exp) == ERROR_MARK)
5412 /* If we have nothing to store, do nothing unless the expression has
5415 return expand_expr (exp, const0_rtx, VOIDmode, 0);
5416 else if (bitsize >= 0 && bitsize < HOST_BITS_PER_WIDE_INT)
5417 width_mask = ((HOST_WIDE_INT) 1 << bitsize) - 1;
5419 /* If we are storing into an unaligned field of an aligned union that is
5420 in a register, we may have the mode of TARGET being an integer mode but
5421 MODE == BLKmode. In that case, get an aligned object whose size and
5422 alignment are the same as TARGET and store TARGET into it (we can avoid
5423 the store if the field being stored is the entire width of TARGET). Then
5424 call ourselves recursively to store the field into a BLKmode version of
5425 that object. Finally, load from the object into TARGET. This is not
5426 very efficient in general, but should only be slightly more expensive
5427 than the otherwise-required unaligned accesses. Perhaps this can be
5428 cleaned up later. It's tempting to make OBJECT readonly, but it's set
5429 twice, once with emit_move_insn and once via store_field. */
5432 && (REG_P (target) || GET_CODE (target) == SUBREG))
5434 rtx object = assign_temp (type, 0, 1, 1);
5435 rtx blk_object = adjust_address (object, BLKmode, 0);
5437 if (bitsize != (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (target)))
5438 emit_move_insn (object, target);
5440 store_field (blk_object, bitsize, bitpos, mode, exp, type, alias_set);
5442 emit_move_insn (target, object);
5444 /* We want to return the BLKmode version of the data. */
5448 if (GET_CODE (target) == CONCAT)
5450 /* We're storing into a struct containing a single __complex. */
5452 gcc_assert (!bitpos);
5453 return store_expr (exp, target, 0);
5456 /* If the structure is in a register or if the component
5457 is a bit field, we cannot use addressing to access it.
5458 Use bit-field techniques or SUBREG to store in it. */
5460 if (mode == VOIDmode
5461 || (mode != BLKmode && ! direct_store[(int) mode]
5462 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
5463 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
5465 || GET_CODE (target) == SUBREG
5466 /* If the field isn't aligned enough to store as an ordinary memref,
5467 store it as a bit field. */
5469 && ((((MEM_ALIGN (target) < GET_MODE_ALIGNMENT (mode))
5470 || bitpos % GET_MODE_ALIGNMENT (mode))
5471 && SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (target)))
5472 || (bitpos % BITS_PER_UNIT != 0)))
5473 /* If the RHS and field are a constant size and the size of the
5474 RHS isn't the same size as the bitfield, we must use bitfield
5477 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
5478 && compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)), bitsize) != 0))
5482 /* If EXP is a NOP_EXPR of precision less than its mode, then that
5483 implies a mask operation. If the precision is the same size as
5484 the field we're storing into, that mask is redundant. This is
5485 particularly common with bit field assignments generated by the
5487 if (TREE_CODE (exp) == NOP_EXPR)
5489 tree type = TREE_TYPE (exp);
5490 if (INTEGRAL_TYPE_P (type)
5491 && TYPE_PRECISION (type) < GET_MODE_BITSIZE (TYPE_MODE (type))
5492 && bitsize == TYPE_PRECISION (type))
5494 type = TREE_TYPE (TREE_OPERAND (exp, 0));
5495 if (INTEGRAL_TYPE_P (type) && TYPE_PRECISION (type) >= bitsize)
5496 exp = TREE_OPERAND (exp, 0);
5500 temp = expand_normal (exp);
5502 /* If BITSIZE is narrower than the size of the type of EXP
5503 we will be narrowing TEMP. Normally, what's wanted are the
5504 low-order bits. However, if EXP's type is a record and this is
5505 big-endian machine, we want the upper BITSIZE bits. */
5506 if (BYTES_BIG_ENDIAN && GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
5507 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (temp))
5508 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
5509 temp = expand_shift (RSHIFT_EXPR, GET_MODE (temp), temp,
5510 size_int (GET_MODE_BITSIZE (GET_MODE (temp))
5514 /* Unless MODE is VOIDmode or BLKmode, convert TEMP to
5516 if (mode != VOIDmode && mode != BLKmode
5517 && mode != TYPE_MODE (TREE_TYPE (exp)))
5518 temp = convert_modes (mode, TYPE_MODE (TREE_TYPE (exp)), temp, 1);
5520 /* If the modes of TARGET and TEMP are both BLKmode, both
5521 must be in memory and BITPOS must be aligned on a byte
5522 boundary. If so, we simply do a block copy. */
5523 if (GET_MODE (target) == BLKmode && GET_MODE (temp) == BLKmode)
5525 gcc_assert (MEM_P (target) && MEM_P (temp)
5526 && !(bitpos % BITS_PER_UNIT));
5528 target = adjust_address (target, VOIDmode, bitpos / BITS_PER_UNIT);
5529 emit_block_move (target, temp,
5530 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
5537 /* Store the value in the bitfield. */
5538 store_bit_field (target, bitsize, bitpos, mode, temp);
5544 /* Now build a reference to just the desired component. */
5545 rtx to_rtx = adjust_address (target, mode, bitpos / BITS_PER_UNIT);
5547 if (to_rtx == target)
5548 to_rtx = copy_rtx (to_rtx);
5550 MEM_SET_IN_STRUCT_P (to_rtx, 1);
5551 if (!MEM_KEEP_ALIAS_SET_P (to_rtx) && MEM_ALIAS_SET (to_rtx) != 0)
5552 set_mem_alias_set (to_rtx, alias_set);
5554 return store_expr (exp, to_rtx, 0);
5558 /* Given an expression EXP that may be a COMPONENT_REF, a BIT_FIELD_REF,
5559 an ARRAY_REF, or an ARRAY_RANGE_REF, look for nested operations of these
5560 codes and find the ultimate containing object, which we return.
5562 We set *PBITSIZE to the size in bits that we want, *PBITPOS to the
5563 bit position, and *PUNSIGNEDP to the signedness of the field.
5564 If the position of the field is variable, we store a tree
5565 giving the variable offset (in units) in *POFFSET.
5566 This offset is in addition to the bit position.
5567 If the position is not variable, we store 0 in *POFFSET.
5569 If any of the extraction expressions is volatile,
5570 we store 1 in *PVOLATILEP. Otherwise we don't change that.
5572 If the field is a bit-field, *PMODE is set to VOIDmode. Otherwise, it
5573 is a mode that can be used to access the field. In that case, *PBITSIZE
5576 If the field describes a variable-sized object, *PMODE is set to
5577 VOIDmode and *PBITSIZE is set to -1. An access cannot be made in
5578 this case, but the address of the object can be found.
5580 If KEEP_ALIGNING is true and the target is STRICT_ALIGNMENT, we don't
5581 look through nodes that serve as markers of a greater alignment than
5582 the one that can be deduced from the expression. These nodes make it
5583 possible for front-ends to prevent temporaries from being created by
5584 the middle-end on alignment considerations. For that purpose, the
5585 normal operating mode at high-level is to always pass FALSE so that
5586 the ultimate containing object is really returned; moreover, the
5587 associated predicate handled_component_p will always return TRUE
5588 on these nodes, thus indicating that they are essentially handled
5589 by get_inner_reference. TRUE should only be passed when the caller
5590 is scanning the expression in order to build another representation
5591 and specifically knows how to handle these nodes; as such, this is
5592 the normal operating mode in the RTL expanders. */
5595 get_inner_reference (tree exp, HOST_WIDE_INT *pbitsize,
5596 HOST_WIDE_INT *pbitpos, tree *poffset,
5597 enum machine_mode *pmode, int *punsignedp,
5598 int *pvolatilep, bool keep_aligning)
5601 enum machine_mode mode = VOIDmode;
5602 tree offset = size_zero_node;
5603 tree bit_offset = bitsize_zero_node;
5606 /* First get the mode, signedness, and size. We do this from just the
5607 outermost expression. */
5608 if (TREE_CODE (exp) == COMPONENT_REF)
5610 size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
5611 if (! DECL_BIT_FIELD (TREE_OPERAND (exp, 1)))
5612 mode = DECL_MODE (TREE_OPERAND (exp, 1));
5614 *punsignedp = DECL_UNSIGNED (TREE_OPERAND (exp, 1));
5616 else if (TREE_CODE (exp) == BIT_FIELD_REF)
5618 size_tree = TREE_OPERAND (exp, 1);
5619 *punsignedp = BIT_FIELD_REF_UNSIGNED (exp);
5623 mode = TYPE_MODE (TREE_TYPE (exp));
5624 *punsignedp = TYPE_UNSIGNED (TREE_TYPE (exp));
5626 if (mode == BLKmode)
5627 size_tree = TYPE_SIZE (TREE_TYPE (exp));
5629 *pbitsize = GET_MODE_BITSIZE (mode);
5634 if (! host_integerp (size_tree, 1))
5635 mode = BLKmode, *pbitsize = -1;
5637 *pbitsize = tree_low_cst (size_tree, 1);
5640 /* Compute cumulative bit-offset for nested component-refs and array-refs,
5641 and find the ultimate containing object. */
5644 switch (TREE_CODE (exp))
5647 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5648 TREE_OPERAND (exp, 2));
5653 tree field = TREE_OPERAND (exp, 1);
5654 tree this_offset = component_ref_field_offset (exp);
5656 /* If this field hasn't been filled in yet, don't go past it.
5657 This should only happen when folding expressions made during
5658 type construction. */
5659 if (this_offset == 0)
5662 offset = size_binop (PLUS_EXPR, offset, this_offset);
5663 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5664 DECL_FIELD_BIT_OFFSET (field));
5666 /* ??? Right now we don't do anything with DECL_OFFSET_ALIGN. */
5671 case ARRAY_RANGE_REF:
5673 tree index = TREE_OPERAND (exp, 1);
5674 tree low_bound = array_ref_low_bound (exp);
5675 tree unit_size = array_ref_element_size (exp);
5677 /* We assume all arrays have sizes that are a multiple of a byte.
5678 First subtract the lower bound, if any, in the type of the
5679 index, then convert to sizetype and multiply by the size of
5680 the array element. */
5681 if (! integer_zerop (low_bound))
5682 index = fold_build2 (MINUS_EXPR, TREE_TYPE (index),
5685 offset = size_binop (PLUS_EXPR, offset,
5686 size_binop (MULT_EXPR,
5687 fold_convert (sizetype, index),
5696 bit_offset = size_binop (PLUS_EXPR, bit_offset,
5697 bitsize_int (*pbitsize));
5700 case VIEW_CONVERT_EXPR:
5701 if (keep_aligning && STRICT_ALIGNMENT
5702 && (TYPE_ALIGN (TREE_TYPE (exp))
5703 > TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0))))
5704 && (TYPE_ALIGN (TREE_TYPE (TREE_OPERAND (exp, 0)))
5705 < BIGGEST_ALIGNMENT)
5706 && (TYPE_ALIGN_OK (TREE_TYPE (exp))
5707 || TYPE_ALIGN_OK (TREE_TYPE (TREE_OPERAND (exp, 0)))))
5715 /* If any reference in the chain is volatile, the effect is volatile. */
5716 if (TREE_THIS_VOLATILE (exp))
5719 exp = TREE_OPERAND (exp, 0);
5723 /* If OFFSET is constant, see if we can return the whole thing as a
5724 constant bit position. Otherwise, split it up. */
5725 if (host_integerp (offset, 0)
5726 && 0 != (tem = size_binop (MULT_EXPR,
5727 fold_convert (bitsizetype, offset),
5729 && 0 != (tem = size_binop (PLUS_EXPR, tem, bit_offset))
5730 && host_integerp (tem, 0))
5731 *pbitpos = tree_low_cst (tem, 0), *poffset = 0;
5733 *pbitpos = tree_low_cst (bit_offset, 0), *poffset = offset;
5739 /* Return a tree of sizetype representing the size, in bytes, of the element
5740 of EXP, an ARRAY_REF. */
5743 array_ref_element_size (tree exp)
5745 tree aligned_size = TREE_OPERAND (exp, 3);
5746 tree elmt_type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)));
5748 /* If a size was specified in the ARRAY_REF, it's the size measured
5749 in alignment units of the element type. So multiply by that value. */
5752 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
5753 sizetype from another type of the same width and signedness. */
5754 if (TREE_TYPE (aligned_size) != sizetype)
5755 aligned_size = fold_convert (sizetype, aligned_size);
5756 return size_binop (MULT_EXPR, aligned_size,
5757 size_int (TYPE_ALIGN_UNIT (elmt_type)));
5760 /* Otherwise, take the size from that of the element type. Substitute
5761 any PLACEHOLDER_EXPR that we have. */
5763 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (elmt_type), exp);
5766 /* Return a tree representing the lower bound of the array mentioned in
5767 EXP, an ARRAY_REF. */
5770 array_ref_low_bound (tree exp)
5772 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
5774 /* If a lower bound is specified in EXP, use it. */
5775 if (TREE_OPERAND (exp, 2))
5776 return TREE_OPERAND (exp, 2);
5778 /* Otherwise, if there is a domain type and it has a lower bound, use it,
5779 substituting for a PLACEHOLDER_EXPR as needed. */
5780 if (domain_type && TYPE_MIN_VALUE (domain_type))
5781 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MIN_VALUE (domain_type), exp);
5783 /* Otherwise, return a zero of the appropriate type. */
5784 return build_int_cst (TREE_TYPE (TREE_OPERAND (exp, 1)), 0);
5787 /* Return a tree representing the upper bound of the array mentioned in
5788 EXP, an ARRAY_REF. */
5791 array_ref_up_bound (tree exp)
5793 tree domain_type = TYPE_DOMAIN (TREE_TYPE (TREE_OPERAND (exp, 0)));
5795 /* If there is a domain type and it has an upper bound, use it, substituting
5796 for a PLACEHOLDER_EXPR as needed. */
5797 if (domain_type && TYPE_MAX_VALUE (domain_type))
5798 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_MAX_VALUE (domain_type), exp);
5800 /* Otherwise fail. */
5804 /* Return a tree representing the offset, in bytes, of the field referenced
5805 by EXP. This does not include any offset in DECL_FIELD_BIT_OFFSET. */
5808 component_ref_field_offset (tree exp)
5810 tree aligned_offset = TREE_OPERAND (exp, 2);
5811 tree field = TREE_OPERAND (exp, 1);
5813 /* If an offset was specified in the COMPONENT_REF, it's the offset measured
5814 in units of DECL_OFFSET_ALIGN / BITS_PER_UNIT. So multiply by that
5818 /* ??? tree_ssa_useless_type_conversion will eliminate casts to
5819 sizetype from another type of the same width and signedness. */
5820 if (TREE_TYPE (aligned_offset) != sizetype)
5821 aligned_offset = fold_convert (sizetype, aligned_offset);
5822 return size_binop (MULT_EXPR, aligned_offset,
5823 size_int (DECL_OFFSET_ALIGN (field) / BITS_PER_UNIT));
5826 /* Otherwise, take the offset from that of the field. Substitute
5827 any PLACEHOLDER_EXPR that we have. */
5829 return SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_FIELD_OFFSET (field), exp);
5832 /* Return 1 if T is an expression that get_inner_reference handles. */
5835 handled_component_p (tree t)
5837 switch (TREE_CODE (t))
5842 case ARRAY_RANGE_REF:
5843 case VIEW_CONVERT_EXPR:
5853 /* Given an rtx VALUE that may contain additions and multiplications, return
5854 an equivalent value that just refers to a register, memory, or constant.
5855 This is done by generating instructions to perform the arithmetic and
5856 returning a pseudo-register containing the value.
5858 The returned value may be a REG, SUBREG, MEM or constant. */
5861 force_operand (rtx value, rtx target)
5864 /* Use subtarget as the target for operand 0 of a binary operation. */
5865 rtx subtarget = get_subtarget (target);
5866 enum rtx_code code = GET_CODE (value);
5868 /* Check for subreg applied to an expression produced by loop optimizer. */
5870 && !REG_P (SUBREG_REG (value))
5871 && !MEM_P (SUBREG_REG (value)))
5873 value = simplify_gen_subreg (GET_MODE (value),
5874 force_reg (GET_MODE (SUBREG_REG (value)),
5875 force_operand (SUBREG_REG (value),
5877 GET_MODE (SUBREG_REG (value)),
5878 SUBREG_BYTE (value));
5879 code = GET_CODE (value);
5882 /* Check for a PIC address load. */
5883 if ((code == PLUS || code == MINUS)
5884 && XEXP (value, 0) == pic_offset_table_rtx
5885 && (GET_CODE (XEXP (value, 1)) == SYMBOL_REF
5886 || GET_CODE (XEXP (value, 1)) == LABEL_REF
5887 || GET_CODE (XEXP (value, 1)) == CONST))
5890 subtarget = gen_reg_rtx (GET_MODE (value));
5891 emit_move_insn (subtarget, value);
5895 if (ARITHMETIC_P (value))
5897 op2 = XEXP (value, 1);
5898 if (!CONSTANT_P (op2) && !(REG_P (op2) && op2 != subtarget))
5900 if (code == MINUS && GET_CODE (op2) == CONST_INT)
5903 op2 = negate_rtx (GET_MODE (value), op2);
5906 /* Check for an addition with OP2 a constant integer and our first
5907 operand a PLUS of a virtual register and something else. In that
5908 case, we want to emit the sum of the virtual register and the
5909 constant first and then add the other value. This allows virtual
5910 register instantiation to simply modify the constant rather than
5911 creating another one around this addition. */
5912 if (code == PLUS && GET_CODE (op2) == CONST_INT
5913 && GET_CODE (XEXP (value, 0)) == PLUS
5914 && REG_P (XEXP (XEXP (value, 0), 0))
5915 && REGNO (XEXP (XEXP (value, 0), 0)) >= FIRST_VIRTUAL_REGISTER
5916 && REGNO (XEXP (XEXP (value, 0), 0)) <= LAST_VIRTUAL_REGISTER)
5918 rtx temp = expand_simple_binop (GET_MODE (value), code,
5919 XEXP (XEXP (value, 0), 0), op2,
5920 subtarget, 0, OPTAB_LIB_WIDEN);
5921 return expand_simple_binop (GET_MODE (value), code, temp,
5922 force_operand (XEXP (XEXP (value,
5924 target, 0, OPTAB_LIB_WIDEN);
5927 op1 = force_operand (XEXP (value, 0), subtarget);
5928 op2 = force_operand (op2, NULL_RTX);
5932 return expand_mult (GET_MODE (value), op1, op2, target, 1);
5934 if (!INTEGRAL_MODE_P (GET_MODE (value)))
5935 return expand_simple_binop (GET_MODE (value), code, op1, op2,
5936 target, 1, OPTAB_LIB_WIDEN);
5938 return expand_divmod (0,
5939 FLOAT_MODE_P (GET_MODE (value))
5940 ? RDIV_EXPR : TRUNC_DIV_EXPR,
5941 GET_MODE (value), op1, op2, target, 0);
5944 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
5948 return expand_divmod (0, TRUNC_DIV_EXPR, GET_MODE (value), op1, op2,
5952 return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
5956 return expand_simple_binop (GET_MODE (value), code, op1, op2,
5957 target, 0, OPTAB_LIB_WIDEN);
5960 return expand_simple_binop (GET_MODE (value), code, op1, op2,
5961 target, 1, OPTAB_LIB_WIDEN);
5964 if (UNARY_P (value))
5967 target = gen_reg_rtx (GET_MODE (value));
5968 op1 = force_operand (XEXP (value, 0), NULL_RTX);
5974 convert_move (target, op1, code == ZERO_EXTEND);
5979 expand_fix (target, op1, code == UNSIGNED_FIX);
5983 case UNSIGNED_FLOAT:
5984 expand_float (target, op1, code == UNSIGNED_FLOAT);
5988 return expand_simple_unop (GET_MODE (value), code, op1, target, 0);
5992 #ifdef INSN_SCHEDULING
5993 /* On machines that have insn scheduling, we want all memory reference to be
5994 explicit, so we need to deal with such paradoxical SUBREGs. */
5995 if (GET_CODE (value) == SUBREG && MEM_P (SUBREG_REG (value))
5996 && (GET_MODE_SIZE (GET_MODE (value))
5997 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (value)))))
5999 = simplify_gen_subreg (GET_MODE (value),
6000 force_reg (GET_MODE (SUBREG_REG (value)),
6001 force_operand (SUBREG_REG (value),
6003 GET_MODE (SUBREG_REG (value)),
6004 SUBREG_BYTE (value));
6010 /* Subroutine of expand_expr: return nonzero iff there is no way that
6011 EXP can reference X, which is being modified. TOP_P is nonzero if this
6012 call is going to be used to determine whether we need a temporary
6013 for EXP, as opposed to a recursive call to this function.
6015 It is always safe for this routine to return zero since it merely
6016 searches for optimization opportunities. */
6019 safe_from_p (rtx x, tree exp, int top_p)
6025 /* If EXP has varying size, we MUST use a target since we currently
6026 have no way of allocating temporaries of variable size
6027 (except for arrays that have TYPE_ARRAY_MAX_SIZE set).
6028 So we assume here that something at a higher level has prevented a
6029 clash. This is somewhat bogus, but the best we can do. Only
6030 do this when X is BLKmode and when we are at the top level. */
6031 || (top_p && TREE_TYPE (exp) != 0 && COMPLETE_TYPE_P (TREE_TYPE (exp))
6032 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
6033 && (TREE_CODE (TREE_TYPE (exp)) != ARRAY_TYPE
6034 || TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)) == NULL_TREE
6035 || TREE_CODE (TYPE_ARRAY_MAX_SIZE (TREE_TYPE (exp)))
6037 && GET_MODE (x) == BLKmode)
6038 /* If X is in the outgoing argument area, it is always safe. */
6040 && (XEXP (x, 0) == virtual_outgoing_args_rtx
6041 || (GET_CODE (XEXP (x, 0)) == PLUS
6042 && XEXP (XEXP (x, 0), 0) == virtual_outgoing_args_rtx))))
6045 /* If this is a subreg of a hard register, declare it unsafe, otherwise,
6046 find the underlying pseudo. */
6047 if (GET_CODE (x) == SUBREG)
6050 if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6054 /* Now look at our tree code and possibly recurse. */
6055 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
6057 case tcc_declaration:
6058 exp_rtl = DECL_RTL_IF_SET (exp);
6064 case tcc_exceptional:
6065 if (TREE_CODE (exp) == TREE_LIST)
6069 if (TREE_VALUE (exp) && !safe_from_p (x, TREE_VALUE (exp), 0))
6071 exp = TREE_CHAIN (exp);
6074 if (TREE_CODE (exp) != TREE_LIST)
6075 return safe_from_p (x, exp, 0);
6078 else if (TREE_CODE (exp) == CONSTRUCTOR)
6080 constructor_elt *ce;
6081 unsigned HOST_WIDE_INT idx;
6084 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
6086 if ((ce->index != NULL_TREE && !safe_from_p (x, ce->index, 0))
6087 || !safe_from_p (x, ce->value, 0))
6091 else if (TREE_CODE (exp) == ERROR_MARK)
6092 return 1; /* An already-visited SAVE_EXPR? */
6097 /* The only case we look at here is the DECL_INITIAL inside a
6099 return (TREE_CODE (exp) != DECL_EXPR
6100 || TREE_CODE (DECL_EXPR_DECL (exp)) != VAR_DECL
6101 || !DECL_INITIAL (DECL_EXPR_DECL (exp))
6102 || safe_from_p (x, DECL_INITIAL (DECL_EXPR_DECL (exp)), 0));
6105 case tcc_comparison:
6106 if (!safe_from_p (x, TREE_OPERAND (exp, 1), 0))
6111 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6113 case tcc_expression:
6115 /* Now do code-specific tests. EXP_RTL is set to any rtx we find in
6116 the expression. If it is set, we conflict iff we are that rtx or
6117 both are in memory. Otherwise, we check all operands of the
6118 expression recursively. */
6120 switch (TREE_CODE (exp))
6123 /* If the operand is static or we are static, we can't conflict.
6124 Likewise if we don't conflict with the operand at all. */
6125 if (staticp (TREE_OPERAND (exp, 0))
6126 || TREE_STATIC (exp)
6127 || safe_from_p (x, TREE_OPERAND (exp, 0), 0))
6130 /* Otherwise, the only way this can conflict is if we are taking
6131 the address of a DECL a that address if part of X, which is
6133 exp = TREE_OPERAND (exp, 0);
6136 if (!DECL_RTL_SET_P (exp)
6137 || !MEM_P (DECL_RTL (exp)))
6140 exp_rtl = XEXP (DECL_RTL (exp), 0);
6144 case MISALIGNED_INDIRECT_REF:
6145 case ALIGN_INDIRECT_REF:
6148 && alias_sets_conflict_p (MEM_ALIAS_SET (x),
6149 get_alias_set (exp)))
6154 /* Assume that the call will clobber all hard registers and
6156 if ((REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER)
6161 case WITH_CLEANUP_EXPR:
6162 case CLEANUP_POINT_EXPR:
6163 /* Lowered by gimplify.c. */
6167 return safe_from_p (x, TREE_OPERAND (exp, 0), 0);
6173 /* If we have an rtx, we do not need to scan our operands. */
6177 nops = TREE_CODE_LENGTH (TREE_CODE (exp));
6178 for (i = 0; i < nops; i++)
6179 if (TREE_OPERAND (exp, i) != 0
6180 && ! safe_from_p (x, TREE_OPERAND (exp, i), 0))
6183 /* If this is a language-specific tree code, it may require
6184 special handling. */
6185 if ((unsigned int) TREE_CODE (exp)
6186 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
6187 && !lang_hooks.safe_from_p (x, exp))
6192 /* Should never get a type here. */
6196 /* If we have an rtl, find any enclosed object. Then see if we conflict
6200 if (GET_CODE (exp_rtl) == SUBREG)
6202 exp_rtl = SUBREG_REG (exp_rtl);
6204 && REGNO (exp_rtl) < FIRST_PSEUDO_REGISTER)
6208 /* If the rtl is X, then it is not safe. Otherwise, it is unless both
6209 are memory and they conflict. */
6210 return ! (rtx_equal_p (x, exp_rtl)
6211 || (MEM_P (x) && MEM_P (exp_rtl)
6212 && true_dependence (exp_rtl, VOIDmode, x,
6213 rtx_addr_varies_p)));
6216 /* If we reach here, it is safe. */
6221 /* Return the highest power of two that EXP is known to be a multiple of.
6222 This is used in updating alignment of MEMs in array references. */
6224 unsigned HOST_WIDE_INT
6225 highest_pow2_factor (tree exp)
6227 unsigned HOST_WIDE_INT c0, c1;
6229 switch (TREE_CODE (exp))
6232 /* We can find the lowest bit that's a one. If the low
6233 HOST_BITS_PER_WIDE_INT bits are zero, return BIGGEST_ALIGNMENT.
6234 We need to handle this case since we can find it in a COND_EXPR,
6235 a MIN_EXPR, or a MAX_EXPR. If the constant overflows, we have an
6236 erroneous program, so return BIGGEST_ALIGNMENT to avoid any
6238 if (TREE_CONSTANT_OVERFLOW (exp))
6239 return BIGGEST_ALIGNMENT;
6242 /* Note: tree_low_cst is intentionally not used here,
6243 we don't care about the upper bits. */
6244 c0 = TREE_INT_CST_LOW (exp);
6246 return c0 ? c0 : BIGGEST_ALIGNMENT;
6250 case PLUS_EXPR: case MINUS_EXPR: case MIN_EXPR: case MAX_EXPR:
6251 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6252 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6253 return MIN (c0, c1);
6256 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6257 c1 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6260 case ROUND_DIV_EXPR: case TRUNC_DIV_EXPR: case FLOOR_DIV_EXPR:
6262 if (integer_pow2p (TREE_OPERAND (exp, 1))
6263 && host_integerp (TREE_OPERAND (exp, 1), 1))
6265 c0 = highest_pow2_factor (TREE_OPERAND (exp, 0));
6266 c1 = tree_low_cst (TREE_OPERAND (exp, 1), 1);
6267 return MAX (1, c0 / c1);
6271 case NON_LVALUE_EXPR: case NOP_EXPR: case CONVERT_EXPR:
6273 return highest_pow2_factor (TREE_OPERAND (exp, 0));
6276 return highest_pow2_factor (TREE_OPERAND (exp, 1));
6279 c0 = highest_pow2_factor (TREE_OPERAND (exp, 1));
6280 c1 = highest_pow2_factor (TREE_OPERAND (exp, 2));
6281 return MIN (c0, c1);
6290 /* Similar, except that the alignment requirements of TARGET are
6291 taken into account. Assume it is at least as aligned as its
6292 type, unless it is a COMPONENT_REF in which case the layout of
6293 the structure gives the alignment. */
6295 static unsigned HOST_WIDE_INT
6296 highest_pow2_factor_for_target (tree target, tree exp)
6298 unsigned HOST_WIDE_INT target_align, factor;
6300 factor = highest_pow2_factor (exp);
6301 if (TREE_CODE (target) == COMPONENT_REF)
6302 target_align = DECL_ALIGN_UNIT (TREE_OPERAND (target, 1));
6304 target_align = TYPE_ALIGN_UNIT (TREE_TYPE (target));
6305 return MAX (factor, target_align);
6308 /* Expands variable VAR. */
6311 expand_var (tree var)
6313 if (DECL_EXTERNAL (var))
6316 if (TREE_STATIC (var))
6317 /* If this is an inlined copy of a static local variable,
6318 look up the original decl. */
6319 var = DECL_ORIGIN (var);
6321 if (TREE_STATIC (var)
6322 ? !TREE_ASM_WRITTEN (var)
6323 : !DECL_RTL_SET_P (var))
6325 if (TREE_CODE (var) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (var))
6326 /* Should be ignored. */;
6327 else if (lang_hooks.expand_decl (var))
6329 else if (TREE_CODE (var) == VAR_DECL && !TREE_STATIC (var))
6331 else if (TREE_CODE (var) == VAR_DECL && TREE_STATIC (var))
6332 rest_of_decl_compilation (var, 0, 0);
6334 /* No expansion needed. */
6335 gcc_assert (TREE_CODE (var) == TYPE_DECL
6336 || TREE_CODE (var) == CONST_DECL
6337 || TREE_CODE (var) == FUNCTION_DECL
6338 || TREE_CODE (var) == LABEL_DECL);
6342 /* Subroutine of expand_expr. Expand the two operands of a binary
6343 expression EXP0 and EXP1 placing the results in OP0 and OP1.
6344 The value may be stored in TARGET if TARGET is nonzero. The
6345 MODIFIER argument is as documented by expand_expr. */
6348 expand_operands (tree exp0, tree exp1, rtx target, rtx *op0, rtx *op1,
6349 enum expand_modifier modifier)
6351 if (! safe_from_p (target, exp1, 1))
6353 if (operand_equal_p (exp0, exp1, 0))
6355 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6356 *op1 = copy_rtx (*op0);
6360 /* If we need to preserve evaluation order, copy exp0 into its own
6361 temporary variable so that it can't be clobbered by exp1. */
6362 if (flag_evaluation_order && TREE_SIDE_EFFECTS (exp1))
6363 exp0 = save_expr (exp0);
6364 *op0 = expand_expr (exp0, target, VOIDmode, modifier);
6365 *op1 = expand_expr (exp1, NULL_RTX, VOIDmode, modifier);
6370 /* Return a MEM that contains constant EXP. DEFER is as for
6371 output_constant_def and MODIFIER is as for expand_expr. */
6374 expand_expr_constant (tree exp, int defer, enum expand_modifier modifier)
6378 mem = output_constant_def (exp, defer);
6379 if (modifier != EXPAND_INITIALIZER)
6380 mem = use_anchored_address (mem);
6384 /* A subroutine of expand_expr_addr_expr. Evaluate the address of EXP.
6385 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6388 expand_expr_addr_expr_1 (tree exp, rtx target, enum machine_mode tmode,
6389 enum expand_modifier modifier)
6391 rtx result, subtarget;
6393 HOST_WIDE_INT bitsize, bitpos;
6394 int volatilep, unsignedp;
6395 enum machine_mode mode1;
6397 /* If we are taking the address of a constant and are at the top level,
6398 we have to use output_constant_def since we can't call force_const_mem
6400 /* ??? This should be considered a front-end bug. We should not be
6401 generating ADDR_EXPR of something that isn't an LVALUE. The only
6402 exception here is STRING_CST. */
6403 if (TREE_CODE (exp) == CONSTRUCTOR
6404 || CONSTANT_CLASS_P (exp))
6405 return XEXP (expand_expr_constant (exp, 0, modifier), 0);
6407 /* Everything must be something allowed by is_gimple_addressable. */
6408 switch (TREE_CODE (exp))
6411 /* This case will happen via recursion for &a->b. */
6412 return expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
6415 /* Recurse and make the output_constant_def clause above handle this. */
6416 return expand_expr_addr_expr_1 (DECL_INITIAL (exp), target,
6420 /* The real part of the complex number is always first, therefore
6421 the address is the same as the address of the parent object. */
6424 inner = TREE_OPERAND (exp, 0);
6428 /* The imaginary part of the complex number is always second.
6429 The expression is therefore always offset by the size of the
6432 bitpos = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (exp)));
6433 inner = TREE_OPERAND (exp, 0);
6437 /* If the object is a DECL, then expand it for its rtl. Don't bypass
6438 expand_expr, as that can have various side effects; LABEL_DECLs for
6439 example, may not have their DECL_RTL set yet. Assume language
6440 specific tree nodes can be expanded in some interesting way. */
6442 || TREE_CODE (exp) >= LAST_AND_UNUSED_TREE_CODE)
6444 result = expand_expr (exp, target, tmode,
6445 modifier == EXPAND_INITIALIZER
6446 ? EXPAND_INITIALIZER : EXPAND_CONST_ADDRESS);
6448 /* If the DECL isn't in memory, then the DECL wasn't properly
6449 marked TREE_ADDRESSABLE, which will be either a front-end
6450 or a tree optimizer bug. */
6451 gcc_assert (MEM_P (result));
6452 result = XEXP (result, 0);
6454 /* ??? Is this needed anymore? */
6455 if (DECL_P (exp) && !TREE_USED (exp) == 0)
6457 assemble_external (exp);
6458 TREE_USED (exp) = 1;
6461 if (modifier != EXPAND_INITIALIZER
6462 && modifier != EXPAND_CONST_ADDRESS)
6463 result = force_operand (result, target);
6467 /* Pass FALSE as the last argument to get_inner_reference although
6468 we are expanding to RTL. The rationale is that we know how to
6469 handle "aligning nodes" here: we can just bypass them because
6470 they won't change the final object whose address will be returned
6471 (they actually exist only for that purpose). */
6472 inner = get_inner_reference (exp, &bitsize, &bitpos, &offset,
6473 &mode1, &unsignedp, &volatilep, false);
6477 /* We must have made progress. */
6478 gcc_assert (inner != exp);
6480 subtarget = offset || bitpos ? NULL_RTX : target;
6481 result = expand_expr_addr_expr_1 (inner, subtarget, tmode, modifier);
6487 if (modifier != EXPAND_NORMAL)
6488 result = force_operand (result, NULL);
6489 tmp = expand_expr (offset, NULL, tmode, EXPAND_NORMAL);
6491 result = convert_memory_address (tmode, result);
6492 tmp = convert_memory_address (tmode, tmp);
6494 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
6495 result = gen_rtx_PLUS (tmode, result, tmp);
6498 subtarget = bitpos ? NULL_RTX : target;
6499 result = expand_simple_binop (tmode, PLUS, result, tmp, subtarget,
6500 1, OPTAB_LIB_WIDEN);
6506 /* Someone beforehand should have rejected taking the address
6507 of such an object. */
6508 gcc_assert ((bitpos % BITS_PER_UNIT) == 0);
6510 result = plus_constant (result, bitpos / BITS_PER_UNIT);
6511 if (modifier < EXPAND_SUM)
6512 result = force_operand (result, target);
6518 /* A subroutine of expand_expr. Evaluate EXP, which is an ADDR_EXPR.
6519 The TARGET, TMODE and MODIFIER arguments are as for expand_expr. */
6522 expand_expr_addr_expr (tree exp, rtx target, enum machine_mode tmode,
6523 enum expand_modifier modifier)
6525 enum machine_mode rmode;
6528 /* Target mode of VOIDmode says "whatever's natural". */
6529 if (tmode == VOIDmode)
6530 tmode = TYPE_MODE (TREE_TYPE (exp));
6532 /* We can get called with some Weird Things if the user does silliness
6533 like "(short) &a". In that case, convert_memory_address won't do
6534 the right thing, so ignore the given target mode. */
6535 if (tmode != Pmode && tmode != ptr_mode)
6538 result = expand_expr_addr_expr_1 (TREE_OPERAND (exp, 0), target,
6541 /* Despite expand_expr claims concerning ignoring TMODE when not
6542 strictly convenient, stuff breaks if we don't honor it. Note
6543 that combined with the above, we only do this for pointer modes. */
6544 rmode = GET_MODE (result);
6545 if (rmode == VOIDmode)
6548 result = convert_memory_address (tmode, result);
6554 /* expand_expr: generate code for computing expression EXP.
6555 An rtx for the computed value is returned. The value is never null.
6556 In the case of a void EXP, const0_rtx is returned.
6558 The value may be stored in TARGET if TARGET is nonzero.
6559 TARGET is just a suggestion; callers must assume that
6560 the rtx returned may not be the same as TARGET.
6562 If TARGET is CONST0_RTX, it means that the value will be ignored.
6564 If TMODE is not VOIDmode, it suggests generating the
6565 result in mode TMODE. But this is done only when convenient.
6566 Otherwise, TMODE is ignored and the value generated in its natural mode.
6567 TMODE is just a suggestion; callers must assume that
6568 the rtx returned may not have mode TMODE.
6570 Note that TARGET may have neither TMODE nor MODE. In that case, it
6571 probably will not be used.
6573 If MODIFIER is EXPAND_SUM then when EXP is an addition
6574 we can return an rtx of the form (MULT (REG ...) (CONST_INT ...))
6575 or a nest of (PLUS ...) and (MINUS ...) where the terms are
6576 products as above, or REG or MEM, or constant.
6577 Ordinarily in such cases we would output mul or add instructions
6578 and then return a pseudo reg containing the sum.
6580 EXPAND_INITIALIZER is much like EXPAND_SUM except that
6581 it also marks a label as absolutely required (it can't be dead).
6582 It also makes a ZERO_EXTEND or SIGN_EXTEND instead of emitting extend insns.
6583 This is used for outputting expressions used in initializers.
6585 EXPAND_CONST_ADDRESS says that it is okay to return a MEM
6586 with a constant address even if that address is not normally legitimate.
6587 EXPAND_INITIALIZER and EXPAND_SUM also have this effect.
6589 EXPAND_STACK_PARM is used when expanding to a TARGET on the stack for
6590 a call parameter. Such targets require special care as we haven't yet
6591 marked TARGET so that it's safe from being trashed by libcalls. We
6592 don't want to use TARGET for anything but the final result;
6593 Intermediate values must go elsewhere. Additionally, calls to
6594 emit_block_move will be flagged with BLOCK_OP_CALL_PARM.
6596 If EXP is a VAR_DECL whose DECL_RTL was a MEM with an invalid
6597 address, and ALT_RTL is non-NULL, then *ALT_RTL is set to the
6598 DECL_RTL of the VAR_DECL. *ALT_RTL is also set if EXP is a
6599 COMPOUND_EXPR whose second argument is such a VAR_DECL, and so on
6602 static rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
6603 enum expand_modifier, rtx *);
6606 expand_expr_real (tree exp, rtx target, enum machine_mode tmode,
6607 enum expand_modifier modifier, rtx *alt_rtl)
6610 rtx ret, last = NULL;
6612 /* Handle ERROR_MARK before anybody tries to access its type. */
6613 if (TREE_CODE (exp) == ERROR_MARK
6614 || TREE_CODE (TREE_TYPE (exp)) == ERROR_MARK)
6616 ret = CONST0_RTX (tmode);
6617 return ret ? ret : const0_rtx;
6620 if (flag_non_call_exceptions)
6622 rn = lookup_stmt_eh_region (exp);
6623 /* If rn < 0, then either (1) tree-ssa not used or (2) doesn't throw. */
6625 last = get_last_insn ();
6628 /* If this is an expression of some kind and it has an associated line
6629 number, then emit the line number before expanding the expression.
6631 We need to save and restore the file and line information so that
6632 errors discovered during expansion are emitted with the right
6633 information. It would be better of the diagnostic routines
6634 used the file/line information embedded in the tree nodes rather
6636 if (cfun && cfun->ib_boundaries_block && EXPR_HAS_LOCATION (exp))
6638 location_t saved_location = input_location;
6639 input_location = EXPR_LOCATION (exp);
6640 emit_line_note (input_location);
6642 /* Record where the insns produced belong. */
6643 record_block_change (TREE_BLOCK (exp));
6645 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
6647 input_location = saved_location;
6651 ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
6654 /* If using non-call exceptions, mark all insns that may trap.
6655 expand_call() will mark CALL_INSNs before we get to this code,
6656 but it doesn't handle libcalls, and these may trap. */
6660 for (insn = next_real_insn (last); insn;
6661 insn = next_real_insn (insn))
6663 if (! find_reg_note (insn, REG_EH_REGION, NULL_RTX)
6664 /* If we want exceptions for non-call insns, any
6665 may_trap_p instruction may throw. */
6666 && GET_CODE (PATTERN (insn)) != CLOBBER
6667 && GET_CODE (PATTERN (insn)) != USE
6668 && (CALL_P (insn) || may_trap_p (PATTERN (insn))))
6670 REG_NOTES (insn) = alloc_EXPR_LIST (REG_EH_REGION, GEN_INT (rn),
6680 expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
6681 enum expand_modifier modifier, rtx *alt_rtl)
6683 rtx op0, op1, temp, decl_rtl;
6684 tree type = TREE_TYPE (exp);
6686 enum machine_mode mode;
6687 enum tree_code code = TREE_CODE (exp);
6689 rtx subtarget, original_target;
6691 tree context, subexp0, subexp1;
6692 bool reduce_bit_field = false;
6693 #define REDUCE_BIT_FIELD(expr) (reduce_bit_field && !ignore \
6694 ? reduce_to_bit_field_precision ((expr), \
6699 mode = TYPE_MODE (type);
6700 unsignedp = TYPE_UNSIGNED (type);
6701 if (lang_hooks.reduce_bit_field_operations
6702 && TREE_CODE (type) == INTEGER_TYPE
6703 && GET_MODE_PRECISION (mode) > TYPE_PRECISION (type))
6705 /* An operation in what may be a bit-field type needs the
6706 result to be reduced to the precision of the bit-field type,
6707 which is narrower than that of the type's mode. */
6708 reduce_bit_field = true;
6709 if (modifier == EXPAND_STACK_PARM)
6713 /* Use subtarget as the target for operand 0 of a binary operation. */
6714 subtarget = get_subtarget (target);
6715 original_target = target;
6716 ignore = (target == const0_rtx
6717 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
6718 || code == CONVERT_EXPR || code == COND_EXPR
6719 || code == VIEW_CONVERT_EXPR)
6720 && TREE_CODE (type) == VOID_TYPE));
6722 /* If we are going to ignore this result, we need only do something
6723 if there is a side-effect somewhere in the expression. If there
6724 is, short-circuit the most common cases here. Note that we must
6725 not call expand_expr with anything but const0_rtx in case this
6726 is an initial expansion of a size that contains a PLACEHOLDER_EXPR. */
6730 if (! TREE_SIDE_EFFECTS (exp))
6733 /* Ensure we reference a volatile object even if value is ignored, but
6734 don't do this if all we are doing is taking its address. */
6735 if (TREE_THIS_VOLATILE (exp)
6736 && TREE_CODE (exp) != FUNCTION_DECL
6737 && mode != VOIDmode && mode != BLKmode
6738 && modifier != EXPAND_CONST_ADDRESS)
6740 temp = expand_expr (exp, NULL_RTX, VOIDmode, modifier);
6742 temp = copy_to_reg (temp);
6746 if (TREE_CODE_CLASS (code) == tcc_unary
6747 || code == COMPONENT_REF || code == INDIRECT_REF)
6748 return expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode,
6751 else if (TREE_CODE_CLASS (code) == tcc_binary
6752 || TREE_CODE_CLASS (code) == tcc_comparison
6753 || code == ARRAY_REF || code == ARRAY_RANGE_REF)
6755 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier);
6756 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, modifier);
6759 else if (code == BIT_FIELD_REF)
6761 expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier);
6762 expand_expr (TREE_OPERAND (exp, 1), const0_rtx, VOIDmode, modifier);
6763 expand_expr (TREE_OPERAND (exp, 2), const0_rtx, VOIDmode, modifier);
6775 tree function = decl_function_context (exp);
6777 temp = label_rtx (exp);
6778 temp = gen_rtx_LABEL_REF (Pmode, temp);
6780 if (function != current_function_decl
6782 LABEL_REF_NONLOCAL_P (temp) = 1;
6784 temp = gen_rtx_MEM (FUNCTION_MODE, temp);
6789 return expand_expr_real_1 (SSA_NAME_VAR (exp), target, tmode, modifier,
6794 /* If a static var's type was incomplete when the decl was written,
6795 but the type is complete now, lay out the decl now. */
6796 if (DECL_SIZE (exp) == 0
6797 && COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (TREE_TYPE (exp))
6798 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
6799 layout_decl (exp, 0);
6801 /* ... fall through ... */
6805 decl_rtl = DECL_RTL (exp);
6806 gcc_assert (decl_rtl);
6808 /* Ensure variable marked as used even if it doesn't go through
6809 a parser. If it hasn't be used yet, write out an external
6811 if (! TREE_USED (exp))
6813 assemble_external (exp);
6814 TREE_USED (exp) = 1;
6817 /* Show we haven't gotten RTL for this yet. */
6820 /* Variables inherited from containing functions should have
6821 been lowered by this point. */
6822 context = decl_function_context (exp);
6823 gcc_assert (!context
6824 || context == current_function_decl
6825 || TREE_STATIC (exp)
6826 /* ??? C++ creates functions that are not TREE_STATIC. */
6827 || TREE_CODE (exp) == FUNCTION_DECL);
6829 /* This is the case of an array whose size is to be determined
6830 from its initializer, while the initializer is still being parsed.
6833 if (MEM_P (decl_rtl) && REG_P (XEXP (decl_rtl, 0)))
6834 temp = validize_mem (decl_rtl);
6836 /* If DECL_RTL is memory, we are in the normal case and either
6837 the address is not valid or it is not a register and -fforce-addr
6838 is specified, get the address into a register. */
6840 else if (MEM_P (decl_rtl) && modifier != EXPAND_INITIALIZER)
6843 *alt_rtl = decl_rtl;
6844 decl_rtl = use_anchored_address (decl_rtl);
6845 if (modifier != EXPAND_CONST_ADDRESS
6846 && modifier != EXPAND_SUM
6847 && (!memory_address_p (DECL_MODE (exp), XEXP (decl_rtl, 0))
6848 || (flag_force_addr && !REG_P (XEXP (decl_rtl, 0)))))
6849 temp = replace_equiv_address (decl_rtl,
6850 copy_rtx (XEXP (decl_rtl, 0)));
6853 /* If we got something, return it. But first, set the alignment
6854 if the address is a register. */
6857 if (MEM_P (temp) && REG_P (XEXP (temp, 0)))
6858 mark_reg_pointer (XEXP (temp, 0), DECL_ALIGN (exp));
6863 /* If the mode of DECL_RTL does not match that of the decl, it
6864 must be a promoted value. We return a SUBREG of the wanted mode,
6865 but mark it so that we know that it was already extended. */
6867 if (REG_P (decl_rtl)
6868 && GET_MODE (decl_rtl) != DECL_MODE (exp))
6870 enum machine_mode pmode;
6872 /* Get the signedness used for this variable. Ensure we get the
6873 same mode we got when the variable was declared. */
6874 pmode = promote_mode (type, DECL_MODE (exp), &unsignedp,
6875 (TREE_CODE (exp) == RESULT_DECL
6876 || TREE_CODE (exp) == PARM_DECL) ? 1 : 0);
6877 gcc_assert (GET_MODE (decl_rtl) == pmode);
6879 temp = gen_lowpart_SUBREG (mode, decl_rtl);
6880 SUBREG_PROMOTED_VAR_P (temp) = 1;
6881 SUBREG_PROMOTED_UNSIGNED_SET (temp, unsignedp);
6888 temp = immed_double_const (TREE_INT_CST_LOW (exp),
6889 TREE_INT_CST_HIGH (exp), mode);
6891 /* ??? If overflow is set, fold will have done an incomplete job,
6892 which can result in (plus xx (const_int 0)), which can get
6893 simplified by validate_replace_rtx during virtual register
6894 instantiation, which can result in unrecognizable insns.
6895 Avoid this by forcing all overflows into registers. */
6896 if (TREE_CONSTANT_OVERFLOW (exp)
6897 && modifier != EXPAND_INITIALIZER)
6898 temp = force_reg (mode, temp);
6903 if (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (exp))) == MODE_VECTOR_INT
6904 || GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (exp))) == MODE_VECTOR_FLOAT)
6905 return const_vector_from_tree (exp);
6907 return expand_expr (build_constructor_from_list
6909 TREE_VECTOR_CST_ELTS (exp)),
6910 ignore ? const0_rtx : target, tmode, modifier);
6913 return expand_expr (DECL_INITIAL (exp), target, VOIDmode, modifier);
6916 /* If optimized, generate immediate CONST_DOUBLE
6917 which will be turned into memory by reload if necessary.
6919 We used to force a register so that loop.c could see it. But
6920 this does not allow gen_* patterns to perform optimizations with
6921 the constants. It also produces two insns in cases like "x = 1.0;".
6922 On most machines, floating-point constants are not permitted in
6923 many insns, so we'd end up copying it to a register in any case.
6925 Now, we do the copying in expand_binop, if appropriate. */
6926 return CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (exp),
6927 TYPE_MODE (TREE_TYPE (exp)));
6930 /* Handle evaluating a complex constant in a CONCAT target. */
6931 if (original_target && GET_CODE (original_target) == CONCAT)
6933 enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
6936 rtarg = XEXP (original_target, 0);
6937 itarg = XEXP (original_target, 1);
6939 /* Move the real and imaginary parts separately. */
6940 op0 = expand_expr (TREE_REALPART (exp), rtarg, mode, 0);
6941 op1 = expand_expr (TREE_IMAGPART (exp), itarg, mode, 0);
6944 emit_move_insn (rtarg, op0);
6946 emit_move_insn (itarg, op1);
6948 return original_target;
6951 /* ... fall through ... */
6954 temp = expand_expr_constant (exp, 1, modifier);
6956 /* temp contains a constant address.
6957 On RISC machines where a constant address isn't valid,
6958 make some insns to get that address into a register. */
6959 if (modifier != EXPAND_CONST_ADDRESS
6960 && modifier != EXPAND_INITIALIZER
6961 && modifier != EXPAND_SUM
6962 && (! memory_address_p (mode, XEXP (temp, 0))
6963 || flag_force_addr))
6964 return replace_equiv_address (temp,
6965 copy_rtx (XEXP (temp, 0)));
6970 tree val = TREE_OPERAND (exp, 0);
6971 rtx ret = expand_expr_real_1 (val, target, tmode, modifier, alt_rtl);
6973 if (!SAVE_EXPR_RESOLVED_P (exp))
6975 /* We can indeed still hit this case, typically via builtin
6976 expanders calling save_expr immediately before expanding
6977 something. Assume this means that we only have to deal
6978 with non-BLKmode values. */
6979 gcc_assert (GET_MODE (ret) != BLKmode);
6981 val = build_decl (VAR_DECL, NULL, TREE_TYPE (exp));
6982 DECL_ARTIFICIAL (val) = 1;
6983 DECL_IGNORED_P (val) = 1;
6984 TREE_OPERAND (exp, 0) = val;
6985 SAVE_EXPR_RESOLVED_P (exp) = 1;
6987 if (!CONSTANT_P (ret))
6988 ret = copy_to_reg (ret);
6989 SET_DECL_RTL (val, ret);
6996 if (TREE_CODE (TREE_OPERAND (exp, 0)) == LABEL_DECL)
6997 expand_goto (TREE_OPERAND (exp, 0));
6999 expand_computed_goto (TREE_OPERAND (exp, 0));
7003 /* If we don't need the result, just ensure we evaluate any
7007 unsigned HOST_WIDE_INT idx;
7010 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
7011 expand_expr (value, const0_rtx, VOIDmode, 0);
7016 /* Try to avoid creating a temporary at all. This is possible
7017 if all of the initializer is zero.
7018 FIXME: try to handle all [0..255] initializers we can handle
7020 else if (TREE_STATIC (exp)
7021 && !TREE_ADDRESSABLE (exp)
7022 && target != 0 && mode == BLKmode
7023 && all_zeros_p (exp))
7025 clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
7029 /* All elts simple constants => refer to a constant in memory. But
7030 if this is a non-BLKmode mode, let it store a field at a time
7031 since that should make a CONST_INT or CONST_DOUBLE when we
7032 fold. Likewise, if we have a target we can use, it is best to
7033 store directly into the target unless the type is large enough
7034 that memcpy will be used. If we are making an initializer and
7035 all operands are constant, put it in memory as well.
7037 FIXME: Avoid trying to fill vector constructors piece-meal.
7038 Output them with output_constant_def below unless we're sure
7039 they're zeros. This should go away when vector initializers
7040 are treated like VECTOR_CST instead of arrays.
7042 else if ((TREE_STATIC (exp)
7043 && ((mode == BLKmode
7044 && ! (target != 0 && safe_from_p (target, exp, 1)))
7045 || TREE_ADDRESSABLE (exp)
7046 || (host_integerp (TYPE_SIZE_UNIT (type), 1)
7047 && (! MOVE_BY_PIECES_P
7048 (tree_low_cst (TYPE_SIZE_UNIT (type), 1),
7050 && ! mostly_zeros_p (exp))))
7051 || ((modifier == EXPAND_INITIALIZER
7052 || modifier == EXPAND_CONST_ADDRESS)
7053 && TREE_CONSTANT (exp)))
7055 rtx constructor = expand_expr_constant (exp, 1, modifier);
7057 if (modifier != EXPAND_CONST_ADDRESS
7058 && modifier != EXPAND_INITIALIZER
7059 && modifier != EXPAND_SUM)
7060 constructor = validize_mem (constructor);
7066 /* Handle calls that pass values in multiple non-contiguous
7067 locations. The Irix 6 ABI has examples of this. */
7068 if (target == 0 || ! safe_from_p (target, exp, 1)
7069 || GET_CODE (target) == PARALLEL
7070 || modifier == EXPAND_STACK_PARM)
7072 = assign_temp (build_qualified_type (type,
7074 | (TREE_READONLY (exp)
7075 * TYPE_QUAL_CONST))),
7076 0, TREE_ADDRESSABLE (exp), 1);
7078 store_constructor (exp, target, 0, int_expr_size (exp));
7082 case MISALIGNED_INDIRECT_REF:
7083 case ALIGN_INDIRECT_REF:
7086 tree exp1 = TREE_OPERAND (exp, 0);
7088 if (modifier != EXPAND_WRITE)
7092 t = fold_read_from_constant_string (exp);
7094 return expand_expr (t, target, tmode, modifier);
7097 op0 = expand_expr (exp1, NULL_RTX, VOIDmode, EXPAND_SUM);
7098 op0 = memory_address (mode, op0);
7100 if (code == ALIGN_INDIRECT_REF)
7102 int align = TYPE_ALIGN_UNIT (type);
7103 op0 = gen_rtx_AND (Pmode, op0, GEN_INT (-align));
7104 op0 = memory_address (mode, op0);
7107 temp = gen_rtx_MEM (mode, op0);
7109 set_mem_attributes (temp, exp, 0);
7111 /* Resolve the misalignment now, so that we don't have to remember
7112 to resolve it later. Of course, this only works for reads. */
7113 /* ??? When we get around to supporting writes, we'll have to handle
7114 this in store_expr directly. The vectorizer isn't generating
7115 those yet, however. */
7116 if (code == MISALIGNED_INDIRECT_REF)
7121 gcc_assert (modifier == EXPAND_NORMAL
7122 || modifier == EXPAND_STACK_PARM);
7124 /* The vectorizer should have already checked the mode. */
7125 icode = movmisalign_optab->handlers[mode].insn_code;
7126 gcc_assert (icode != CODE_FOR_nothing);
7128 /* We've already validated the memory, and we're creating a
7129 new pseudo destination. The predicates really can't fail. */
7130 reg = gen_reg_rtx (mode);
7132 /* Nor can the insn generator. */
7133 insn = GEN_FCN (icode) (reg, temp);
7142 case TARGET_MEM_REF:
7144 struct mem_address addr;
7146 get_address_description (exp, &addr);
7147 op0 = addr_for_mem_ref (&addr, true);
7148 op0 = memory_address (mode, op0);
7149 temp = gen_rtx_MEM (mode, op0);
7150 set_mem_attributes (temp, TMR_ORIGINAL (exp), 0);
7157 tree array = TREE_OPERAND (exp, 0);
7158 tree index = TREE_OPERAND (exp, 1);
7160 /* Fold an expression like: "foo"[2].
7161 This is not done in fold so it won't happen inside &.
7162 Don't fold if this is for wide characters since it's too
7163 difficult to do correctly and this is a very rare case. */
7165 if (modifier != EXPAND_CONST_ADDRESS
7166 && modifier != EXPAND_INITIALIZER
7167 && modifier != EXPAND_MEMORY)
7169 tree t = fold_read_from_constant_string (exp);
7172 return expand_expr (t, target, tmode, modifier);
7175 /* If this is a constant index into a constant array,
7176 just get the value from the array. Handle both the cases when
7177 we have an explicit constructor and when our operand is a variable
7178 that was declared const. */
7180 if (modifier != EXPAND_CONST_ADDRESS
7181 && modifier != EXPAND_INITIALIZER
7182 && modifier != EXPAND_MEMORY
7183 && TREE_CODE (array) == CONSTRUCTOR
7184 && ! TREE_SIDE_EFFECTS (array)
7185 && TREE_CODE (index) == INTEGER_CST)
7187 unsigned HOST_WIDE_INT ix;
7190 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (array), ix,
7192 if (tree_int_cst_equal (field, index))
7194 if (!TREE_SIDE_EFFECTS (value))
7195 return expand_expr (fold (value), target, tmode, modifier);
7200 else if (optimize >= 1
7201 && modifier != EXPAND_CONST_ADDRESS
7202 && modifier != EXPAND_INITIALIZER
7203 && modifier != EXPAND_MEMORY
7204 && TREE_READONLY (array) && ! TREE_SIDE_EFFECTS (array)
7205 && TREE_CODE (array) == VAR_DECL && DECL_INITIAL (array)
7206 && TREE_CODE (DECL_INITIAL (array)) != ERROR_MARK
7207 && targetm.binds_local_p (array))
7209 if (TREE_CODE (index) == INTEGER_CST)
7211 tree init = DECL_INITIAL (array);
7213 if (TREE_CODE (init) == CONSTRUCTOR)
7215 unsigned HOST_WIDE_INT ix;
7218 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (init), ix,
7220 if (tree_int_cst_equal (field, index))
7222 if (!TREE_SIDE_EFFECTS (value))
7223 return expand_expr (fold (value), target, tmode,
7228 else if(TREE_CODE (init) == STRING_CST)
7230 tree index1 = index;
7231 tree low_bound = array_ref_low_bound (exp);
7232 index1 = fold_convert (sizetype, TREE_OPERAND (exp, 1));
7234 /* Optimize the special-case of a zero lower bound.
7236 We convert the low_bound to sizetype to avoid some problems
7237 with constant folding. (E.g. suppose the lower bound is 1,
7238 and its mode is QI. Without the conversion,l (ARRAY
7239 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
7240 +INDEX), which becomes (ARRAY+255+INDEX). Opps!) */
7242 if (! integer_zerop (low_bound))
7243 index1 = size_diffop (index1, fold_convert (sizetype,
7246 if (0 > compare_tree_int (index1,
7247 TREE_STRING_LENGTH (init)))
7249 tree type = TREE_TYPE (TREE_TYPE (init));
7250 enum machine_mode mode = TYPE_MODE (type);
7252 if (GET_MODE_CLASS (mode) == MODE_INT
7253 && GET_MODE_SIZE (mode) == 1)
7254 return gen_int_mode (TREE_STRING_POINTER (init)
7255 [TREE_INT_CST_LOW (index1)],
7262 goto normal_inner_ref;
7265 /* If the operand is a CONSTRUCTOR, we can just extract the
7266 appropriate field if it is present. */
7267 if (TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR)
7269 unsigned HOST_WIDE_INT idx;
7272 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)),
7274 if (field == TREE_OPERAND (exp, 1)
7275 /* We can normally use the value of the field in the
7276 CONSTRUCTOR. However, if this is a bitfield in
7277 an integral mode that we can fit in a HOST_WIDE_INT,
7278 we must mask only the number of bits in the bitfield,
7279 since this is done implicitly by the constructor. If
7280 the bitfield does not meet either of those conditions,
7281 we can't do this optimization. */
7282 && (! DECL_BIT_FIELD (field)
7283 || ((GET_MODE_CLASS (DECL_MODE (field)) == MODE_INT)
7284 && (GET_MODE_BITSIZE (DECL_MODE (field))
7285 <= HOST_BITS_PER_WIDE_INT))))
7287 if (DECL_BIT_FIELD (field)
7288 && modifier == EXPAND_STACK_PARM)
7290 op0 = expand_expr (value, target, tmode, modifier);
7291 if (DECL_BIT_FIELD (field))
7293 HOST_WIDE_INT bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
7294 enum machine_mode imode = TYPE_MODE (TREE_TYPE (field));
7296 if (TYPE_UNSIGNED (TREE_TYPE (field)))
7298 op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
7299 op0 = expand_and (imode, op0, op1, target);
7304 = build_int_cst (NULL_TREE,
7305 GET_MODE_BITSIZE (imode) - bitsize);
7307 op0 = expand_shift (LSHIFT_EXPR, imode, op0, count,
7309 op0 = expand_shift (RSHIFT_EXPR, imode, op0, count,
7317 goto normal_inner_ref;
7320 case ARRAY_RANGE_REF:
7323 enum machine_mode mode1;
7324 HOST_WIDE_INT bitsize, bitpos;
7327 tree tem = get_inner_reference (exp, &bitsize, &bitpos, &offset,
7328 &mode1, &unsignedp, &volatilep, true);
7331 /* If we got back the original object, something is wrong. Perhaps
7332 we are evaluating an expression too early. In any event, don't
7333 infinitely recurse. */
7334 gcc_assert (tem != exp);
7336 /* If TEM's type is a union of variable size, pass TARGET to the inner
7337 computation, since it will need a temporary and TARGET is known
7338 to have to do. This occurs in unchecked conversion in Ada. */
7342 (TREE_CODE (TREE_TYPE (tem)) == UNION_TYPE
7343 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (tem)))
7345 && modifier != EXPAND_STACK_PARM
7346 ? target : NULL_RTX),
7348 (modifier == EXPAND_INITIALIZER
7349 || modifier == EXPAND_CONST_ADDRESS
7350 || modifier == EXPAND_STACK_PARM)
7351 ? modifier : EXPAND_NORMAL);
7353 /* If this is a constant, put it into a register if it is a legitimate
7354 constant, OFFSET is 0, and we won't try to extract outside the
7355 register (in case we were passed a partially uninitialized object
7356 or a view_conversion to a larger size). Force the constant to
7357 memory otherwise. */
7358 if (CONSTANT_P (op0))
7360 enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
7361 if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
7363 && bitpos + bitsize <= GET_MODE_BITSIZE (mode))
7364 op0 = force_reg (mode, op0);
7366 op0 = validize_mem (force_const_mem (mode, op0));
7369 /* Otherwise, if this object not in memory and we either have an
7370 offset, a BLKmode result, or a reference outside the object, put it
7371 there. Such cases can occur in Ada if we have unchecked conversion
7372 of an expression from a scalar type to an array or record type or
7373 for an ARRAY_RANGE_REF whose type is BLKmode. */
7374 else if (!MEM_P (op0)
7376 || (bitpos + bitsize > GET_MODE_BITSIZE (GET_MODE (op0)))
7377 || (code == ARRAY_RANGE_REF && mode == BLKmode)))
7379 tree nt = build_qualified_type (TREE_TYPE (tem),
7380 (TYPE_QUALS (TREE_TYPE (tem))
7381 | TYPE_QUAL_CONST));
7382 rtx memloc = assign_temp (nt, 1, 1, 1);
7384 emit_move_insn (memloc, op0);
7390 rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode,
7393 gcc_assert (MEM_P (op0));
7395 #ifdef POINTERS_EXTEND_UNSIGNED
7396 if (GET_MODE (offset_rtx) != Pmode)
7397 offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
7399 if (GET_MODE (offset_rtx) != ptr_mode)
7400 offset_rtx = convert_to_mode (ptr_mode, offset_rtx, 0);
7403 if (GET_MODE (op0) == BLKmode
7404 /* A constant address in OP0 can have VOIDmode, we must
7405 not try to call force_reg in that case. */
7406 && GET_MODE (XEXP (op0, 0)) != VOIDmode
7408 && (bitpos % bitsize) == 0
7409 && (bitsize % GET_MODE_ALIGNMENT (mode1)) == 0
7410 && MEM_ALIGN (op0) == GET_MODE_ALIGNMENT (mode1))
7412 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
7416 op0 = offset_address (op0, offset_rtx,
7417 highest_pow2_factor (offset));
7420 /* If OFFSET is making OP0 more aligned than BIGGEST_ALIGNMENT,
7421 record its alignment as BIGGEST_ALIGNMENT. */
7422 if (MEM_P (op0) && bitpos == 0 && offset != 0
7423 && is_aligning_offset (offset, tem))
7424 set_mem_align (op0, BIGGEST_ALIGNMENT);
7426 /* Don't forget about volatility even if this is a bitfield. */
7427 if (MEM_P (op0) && volatilep && ! MEM_VOLATILE_P (op0))
7429 if (op0 == orig_op0)
7430 op0 = copy_rtx (op0);
7432 MEM_VOLATILE_P (op0) = 1;
7435 /* The following code doesn't handle CONCAT.
7436 Assume only bitpos == 0 can be used for CONCAT, due to
7437 one element arrays having the same mode as its element. */
7438 if (GET_CODE (op0) == CONCAT)
7440 gcc_assert (bitpos == 0
7441 && bitsize == GET_MODE_BITSIZE (GET_MODE (op0)));
7445 /* In cases where an aligned union has an unaligned object
7446 as a field, we might be extracting a BLKmode value from
7447 an integer-mode (e.g., SImode) object. Handle this case
7448 by doing the extract into an object as wide as the field
7449 (which we know to be the width of a basic mode), then
7450 storing into memory, and changing the mode to BLKmode. */
7451 if (mode1 == VOIDmode
7452 || REG_P (op0) || GET_CODE (op0) == SUBREG
7453 || (mode1 != BLKmode && ! direct_load[(int) mode1]
7454 && GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
7455 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT
7456 && modifier != EXPAND_CONST_ADDRESS
7457 && modifier != EXPAND_INITIALIZER)
7458 /* If the field isn't aligned enough to fetch as a memref,
7459 fetch it as a bit field. */
7460 || (mode1 != BLKmode
7461 && (((TYPE_ALIGN (TREE_TYPE (tem)) < GET_MODE_ALIGNMENT (mode)
7462 || (bitpos % GET_MODE_ALIGNMENT (mode) != 0)
7464 && (MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode1)
7465 || (bitpos % GET_MODE_ALIGNMENT (mode1) != 0))))
7466 && ((modifier == EXPAND_CONST_ADDRESS
7467 || modifier == EXPAND_INITIALIZER)
7469 : SLOW_UNALIGNED_ACCESS (mode1, MEM_ALIGN (op0))))
7470 || (bitpos % BITS_PER_UNIT != 0)))
7471 /* If the type and the field are a constant size and the
7472 size of the type isn't the same size as the bitfield,
7473 we must use bitfield operations. */
7475 && TYPE_SIZE (TREE_TYPE (exp))
7476 && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) == INTEGER_CST
7477 && 0 != compare_tree_int (TYPE_SIZE (TREE_TYPE (exp)),
7480 enum machine_mode ext_mode = mode;
7482 if (ext_mode == BLKmode
7483 && ! (target != 0 && MEM_P (op0)
7485 && bitpos % BITS_PER_UNIT == 0))
7486 ext_mode = mode_for_size (bitsize, MODE_INT, 1);
7488 if (ext_mode == BLKmode)
7491 target = assign_temp (type, 0, 1, 1);
7496 /* In this case, BITPOS must start at a byte boundary and
7497 TARGET, if specified, must be a MEM. */
7498 gcc_assert (MEM_P (op0)
7499 && (!target || MEM_P (target))
7500 && !(bitpos % BITS_PER_UNIT));
7502 emit_block_move (target,
7503 adjust_address (op0, VOIDmode,
7504 bitpos / BITS_PER_UNIT),
7505 GEN_INT ((bitsize + BITS_PER_UNIT - 1)
7507 (modifier == EXPAND_STACK_PARM
7508 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
7513 op0 = validize_mem (op0);
7515 if (MEM_P (op0) && REG_P (XEXP (op0, 0)))
7516 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
7518 op0 = extract_bit_field (op0, bitsize, bitpos, unsignedp,
7519 (modifier == EXPAND_STACK_PARM
7520 ? NULL_RTX : target),
7521 ext_mode, ext_mode);
7523 /* If the result is a record type and BITSIZE is narrower than
7524 the mode of OP0, an integral mode, and this is a big endian
7525 machine, we must put the field into the high-order bits. */
7526 if (TREE_CODE (type) == RECORD_TYPE && BYTES_BIG_ENDIAN
7527 && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
7528 && bitsize < (HOST_WIDE_INT) GET_MODE_BITSIZE (GET_MODE (op0)))
7529 op0 = expand_shift (LSHIFT_EXPR, GET_MODE (op0), op0,
7530 size_int (GET_MODE_BITSIZE (GET_MODE (op0))
7534 /* If the result type is BLKmode, store the data into a temporary
7535 of the appropriate type, but with the mode corresponding to the
7536 mode for the data we have (op0's mode). It's tempting to make
7537 this a constant type, since we know it's only being stored once,
7538 but that can cause problems if we are taking the address of this
7539 COMPONENT_REF because the MEM of any reference via that address
7540 will have flags corresponding to the type, which will not
7541 necessarily be constant. */
7542 if (mode == BLKmode)
7545 = assign_stack_temp_for_type
7546 (ext_mode, GET_MODE_BITSIZE (ext_mode), 0, type);
7548 emit_move_insn (new, op0);
7549 op0 = copy_rtx (new);
7550 PUT_MODE (op0, BLKmode);
7551 set_mem_attributes (op0, exp, 1);
7557 /* If the result is BLKmode, use that to access the object
7559 if (mode == BLKmode)
7562 /* Get a reference to just this component. */
7563 if (modifier == EXPAND_CONST_ADDRESS
7564 || modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7565 op0 = adjust_address_nv (op0, mode1, bitpos / BITS_PER_UNIT);
7567 op0 = adjust_address (op0, mode1, bitpos / BITS_PER_UNIT);
7569 if (op0 == orig_op0)
7570 op0 = copy_rtx (op0);
7572 set_mem_attributes (op0, exp, 0);
7573 if (REG_P (XEXP (op0, 0)))
7574 mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));
7576 MEM_VOLATILE_P (op0) |= volatilep;
7577 if (mode == mode1 || mode1 == BLKmode || mode1 == tmode
7578 || modifier == EXPAND_CONST_ADDRESS
7579 || modifier == EXPAND_INITIALIZER)
7581 else if (target == 0)
7582 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
7584 convert_move (target, op0, unsignedp);
7589 return expand_expr (OBJ_TYPE_REF_EXPR (exp), target, tmode, modifier);
7592 /* Check for a built-in function. */
7593 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
7594 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
7596 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
7598 if (DECL_BUILT_IN_CLASS (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
7599 == BUILT_IN_FRONTEND)
7600 return lang_hooks.expand_expr (exp, original_target,
7604 return expand_builtin (exp, target, subtarget, tmode, ignore);
7607 return expand_call (exp, target, ignore);
7609 case NON_LVALUE_EXPR:
7612 if (TREE_OPERAND (exp, 0) == error_mark_node)
7615 if (TREE_CODE (type) == UNION_TYPE)
7617 tree valtype = TREE_TYPE (TREE_OPERAND (exp, 0));
7619 /* If both input and output are BLKmode, this conversion isn't doing
7620 anything except possibly changing memory attribute. */
7621 if (mode == BLKmode && TYPE_MODE (valtype) == BLKmode)
7623 rtx result = expand_expr (TREE_OPERAND (exp, 0), target, tmode,
7626 result = copy_rtx (result);
7627 set_mem_attributes (result, exp, 0);
7633 if (TYPE_MODE (type) != BLKmode)
7634 target = gen_reg_rtx (TYPE_MODE (type));
7636 target = assign_temp (type, 0, 1, 1);
7640 /* Store data into beginning of memory target. */
7641 store_expr (TREE_OPERAND (exp, 0),
7642 adjust_address (target, TYPE_MODE (valtype), 0),
7643 modifier == EXPAND_STACK_PARM);
7647 gcc_assert (REG_P (target));
7649 /* Store this field into a union of the proper type. */
7650 store_field (target,
7651 MIN ((int_size_in_bytes (TREE_TYPE
7652 (TREE_OPERAND (exp, 0)))
7654 (HOST_WIDE_INT) GET_MODE_BITSIZE (mode)),
7655 0, TYPE_MODE (valtype), TREE_OPERAND (exp, 0),
7659 /* Return the entire union. */
7663 if (mode == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))
7665 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode,
7668 /* If the signedness of the conversion differs and OP0 is
7669 a promoted SUBREG, clear that indication since we now
7670 have to do the proper extension. */
7671 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))) != unsignedp
7672 && GET_CODE (op0) == SUBREG)
7673 SUBREG_PROMOTED_VAR_P (op0) = 0;
7675 return REDUCE_BIT_FIELD (op0);
7678 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, modifier);
7679 if (GET_MODE (op0) == mode)
7682 /* If OP0 is a constant, just convert it into the proper mode. */
7683 else if (CONSTANT_P (op0))
7685 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
7686 enum machine_mode inner_mode = TYPE_MODE (inner_type);
7688 if (modifier == EXPAND_INITIALIZER)
7689 op0 = simplify_gen_subreg (mode, op0, inner_mode,
7690 subreg_lowpart_offset (mode,
7693 op0= convert_modes (mode, inner_mode, op0,
7694 TYPE_UNSIGNED (inner_type));
7697 else if (modifier == EXPAND_INITIALIZER)
7698 op0 = gen_rtx_fmt_e (unsignedp ? ZERO_EXTEND : SIGN_EXTEND, mode, op0);
7700 else if (target == 0)
7701 op0 = convert_to_mode (mode, op0,
7702 TYPE_UNSIGNED (TREE_TYPE
7703 (TREE_OPERAND (exp, 0))));
7706 convert_move (target, op0,
7707 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7711 return REDUCE_BIT_FIELD (op0);
7713 case VIEW_CONVERT_EXPR:
7714 op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, modifier);
7716 /* If the input and output modes are both the same, we are done. */
7717 if (TYPE_MODE (type) == GET_MODE (op0))
7719 /* If neither mode is BLKmode, and both modes are the same size
7720 then we can use gen_lowpart. */
7721 else if (TYPE_MODE (type) != BLKmode && GET_MODE (op0) != BLKmode
7722 && GET_MODE_SIZE (TYPE_MODE (type))
7723 == GET_MODE_SIZE (GET_MODE (op0)))
7725 if (GET_CODE (op0) == SUBREG)
7726 op0 = force_reg (GET_MODE (op0), op0);
7727 op0 = gen_lowpart (TYPE_MODE (type), op0);
7729 /* If both modes are integral, then we can convert from one to the
7731 else if (SCALAR_INT_MODE_P (GET_MODE (op0))
7732 && SCALAR_INT_MODE_P (TYPE_MODE (type)))
7733 op0 = convert_modes (TYPE_MODE (type), GET_MODE (op0), op0,
7734 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
7735 /* As a last resort, spill op0 to memory, and reload it in a
7737 else if (!MEM_P (op0))
7739 /* If the operand is not a MEM, force it into memory. Since we
7740 are going to be changing the mode of the MEM, don't call
7741 force_const_mem for constants because we don't allow pool
7742 constants to change mode. */
7743 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
7745 gcc_assert (!TREE_ADDRESSABLE (exp));
7747 if (target == 0 || GET_MODE (target) != TYPE_MODE (inner_type))
7749 = assign_stack_temp_for_type
7750 (TYPE_MODE (inner_type),
7751 GET_MODE_SIZE (TYPE_MODE (inner_type)), 0, inner_type);
7753 emit_move_insn (target, op0);
7757 /* At this point, OP0 is in the correct mode. If the output type is such
7758 that the operand is known to be aligned, indicate that it is.
7759 Otherwise, we need only be concerned about alignment for non-BLKmode
7763 op0 = copy_rtx (op0);
7765 if (TYPE_ALIGN_OK (type))
7766 set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type)));
7767 else if (TYPE_MODE (type) != BLKmode && STRICT_ALIGNMENT
7768 && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (TYPE_MODE (type)))
7770 tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
7771 HOST_WIDE_INT temp_size
7772 = MAX (int_size_in_bytes (inner_type),
7773 (HOST_WIDE_INT) GET_MODE_SIZE (TYPE_MODE (type)));
7774 rtx new = assign_stack_temp_for_type (TYPE_MODE (type),
7775 temp_size, 0, type);
7776 rtx new_with_op0_mode = adjust_address (new, GET_MODE (op0), 0);
7778 gcc_assert (!TREE_ADDRESSABLE (exp));
7780 if (GET_MODE (op0) == BLKmode)
7781 emit_block_move (new_with_op0_mode, op0,
7782 GEN_INT (GET_MODE_SIZE (TYPE_MODE (type))),
7783 (modifier == EXPAND_STACK_PARM
7784 ? BLOCK_OP_CALL_PARM : BLOCK_OP_NORMAL));
7786 emit_move_insn (new_with_op0_mode, op0);
7791 op0 = adjust_address (op0, TYPE_MODE (type), 0);
7797 /* If we are adding a constant, a VAR_DECL that is sp, fp, or ap, and
7798 something else, make sure we add the register to the constant and
7799 then to the other thing. This case can occur during strength
7800 reduction and doing it this way will produce better code if the
7801 frame pointer or argument pointer is eliminated.
7803 fold-const.c will ensure that the constant is always in the inner
7804 PLUS_EXPR, so the only case we need to do anything about is if
7805 sp, ap, or fp is our second argument, in which case we must swap
7806 the innermost first argument and our second argument. */
7808 if (TREE_CODE (TREE_OPERAND (exp, 0)) == PLUS_EXPR
7809 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 1)) == INTEGER_CST
7810 && TREE_CODE (TREE_OPERAND (exp, 1)) == VAR_DECL
7811 && (DECL_RTL (TREE_OPERAND (exp, 1)) == frame_pointer_rtx
7812 || DECL_RTL (TREE_OPERAND (exp, 1)) == stack_pointer_rtx
7813 || DECL_RTL (TREE_OPERAND (exp, 1)) == arg_pointer_rtx))
7815 tree t = TREE_OPERAND (exp, 1);
7817 TREE_OPERAND (exp, 1) = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
7818 TREE_OPERAND (TREE_OPERAND (exp, 0), 0) = t;
7821 /* If the result is to be ptr_mode and we are adding an integer to
7822 something, we might be forming a constant. So try to use
7823 plus_constant. If it produces a sum and we can't accept it,
7824 use force_operand. This allows P = &ARR[const] to generate
7825 efficient code on machines where a SYMBOL_REF is not a valid
7828 If this is an EXPAND_SUM call, always return the sum. */
7829 if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER
7830 || (mode == ptr_mode && (unsignedp || ! flag_trapv)))
7832 if (modifier == EXPAND_STACK_PARM)
7834 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
7835 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7836 && TREE_CONSTANT (TREE_OPERAND (exp, 1)))
7840 op1 = expand_expr (TREE_OPERAND (exp, 1), subtarget, VOIDmode,
7842 /* Use immed_double_const to ensure that the constant is
7843 truncated according to the mode of OP1, then sign extended
7844 to a HOST_WIDE_INT. Using the constant directly can result
7845 in non-canonical RTL in a 64x32 cross compile. */
7847 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 0)),
7849 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))));
7850 op1 = plus_constant (op1, INTVAL (constant_part));
7851 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7852 op1 = force_operand (op1, target);
7853 return REDUCE_BIT_FIELD (op1);
7856 else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
7857 && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
7858 && TREE_CONSTANT (TREE_OPERAND (exp, 0)))
7862 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7863 (modifier == EXPAND_INITIALIZER
7864 ? EXPAND_INITIALIZER : EXPAND_SUM));
7865 if (! CONSTANT_P (op0))
7867 op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX,
7868 VOIDmode, modifier);
7869 /* Return a PLUS if modifier says it's OK. */
7870 if (modifier == EXPAND_SUM
7871 || modifier == EXPAND_INITIALIZER)
7872 return simplify_gen_binary (PLUS, mode, op0, op1);
7875 /* Use immed_double_const to ensure that the constant is
7876 truncated according to the mode of OP1, then sign extended
7877 to a HOST_WIDE_INT. Using the constant directly can result
7878 in non-canonical RTL in a 64x32 cross compile. */
7880 = immed_double_const (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)),
7882 TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))));
7883 op0 = plus_constant (op0, INTVAL (constant_part));
7884 if (modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7885 op0 = force_operand (op0, target);
7886 return REDUCE_BIT_FIELD (op0);
7890 /* No sense saving up arithmetic to be done
7891 if it's all in the wrong mode to form part of an address.
7892 And force_operand won't know whether to sign-extend or
7894 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7895 || mode != ptr_mode)
7897 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
7898 subtarget, &op0, &op1, 0);
7899 if (op0 == const0_rtx)
7901 if (op1 == const0_rtx)
7906 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
7907 subtarget, &op0, &op1, modifier);
7908 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
7911 /* For initializers, we are allowed to return a MINUS of two
7912 symbolic constants. Here we handle all cases when both operands
7914 /* Handle difference of two symbolic constants,
7915 for the sake of an initializer. */
7916 if ((modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
7917 && really_constant_p (TREE_OPERAND (exp, 0))
7918 && really_constant_p (TREE_OPERAND (exp, 1)))
7920 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
7921 NULL_RTX, &op0, &op1, modifier);
7923 /* If the last operand is a CONST_INT, use plus_constant of
7924 the negated constant. Else make the MINUS. */
7925 if (GET_CODE (op1) == CONST_INT)
7926 return REDUCE_BIT_FIELD (plus_constant (op0, - INTVAL (op1)));
7928 return REDUCE_BIT_FIELD (gen_rtx_MINUS (mode, op0, op1));
7931 /* No sense saving up arithmetic to be done
7932 if it's all in the wrong mode to form part of an address.
7933 And force_operand won't know whether to sign-extend or
7935 if ((modifier != EXPAND_SUM && modifier != EXPAND_INITIALIZER)
7936 || mode != ptr_mode)
7939 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
7940 subtarget, &op0, &op1, modifier);
7942 /* Convert A - const to A + (-const). */
7943 if (GET_CODE (op1) == CONST_INT)
7945 op1 = negate_rtx (mode, op1);
7946 return REDUCE_BIT_FIELD (simplify_gen_binary (PLUS, mode, op0, op1));
7952 /* If first operand is constant, swap them.
7953 Thus the following special case checks need only
7954 check the second operand. */
7955 if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST)
7957 tree t1 = TREE_OPERAND (exp, 0);
7958 TREE_OPERAND (exp, 0) = TREE_OPERAND (exp, 1);
7959 TREE_OPERAND (exp, 1) = t1;
7962 /* Attempt to return something suitable for generating an
7963 indexed address, for machines that support that. */
7965 if (modifier == EXPAND_SUM && mode == ptr_mode
7966 && host_integerp (TREE_OPERAND (exp, 1), 0))
7968 tree exp1 = TREE_OPERAND (exp, 1);
7970 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode,
7974 op0 = force_operand (op0, NULL_RTX);
7976 op0 = copy_to_mode_reg (mode, op0);
7978 return REDUCE_BIT_FIELD (gen_rtx_MULT (mode, op0,
7979 gen_int_mode (tree_low_cst (exp1, 0),
7980 TYPE_MODE (TREE_TYPE (exp1)))));
7983 if (modifier == EXPAND_STACK_PARM)
7986 /* Check for multiplying things that have been extended
7987 from a narrower type. If this machine supports multiplying
7988 in that narrower type with a result in the desired type,
7989 do it that way, and avoid the explicit type-conversion. */
7991 subexp0 = TREE_OPERAND (exp, 0);
7992 subexp1 = TREE_OPERAND (exp, 1);
7993 /* First, check if we have a multiplication of one signed and one
7994 unsigned operand. */
7995 if (TREE_CODE (subexp0) == NOP_EXPR
7996 && TREE_CODE (subexp1) == NOP_EXPR
7997 && TREE_CODE (type) == INTEGER_TYPE
7998 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
7999 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
8000 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
8001 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (subexp1, 0))))
8002 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp0, 0)))
8003 != TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp1, 0)))))
8005 enum machine_mode innermode
8006 = TYPE_MODE (TREE_TYPE (TREE_OPERAND (subexp0, 0)));
8007 this_optab = usmul_widen_optab;
8008 if (mode == GET_MODE_WIDER_MODE (innermode))
8010 if (this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
8012 if (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (subexp0, 0))))
8013 expand_operands (TREE_OPERAND (subexp0, 0),
8014 TREE_OPERAND (subexp1, 0),
8015 NULL_RTX, &op0, &op1, 0);
8017 expand_operands (TREE_OPERAND (subexp0, 0),
8018 TREE_OPERAND (subexp1, 0),
8019 NULL_RTX, &op1, &op0, 0);
8025 /* Check for a multiplication with matching signedness. */
8026 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == NOP_EXPR
8027 && TREE_CODE (type) == INTEGER_TYPE
8028 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
8029 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))))
8030 && ((TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
8031 && int_fits_type_p (TREE_OPERAND (exp, 1),
8032 TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)))
8033 /* Don't use a widening multiply if a shift will do. */
8034 && ((GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 1))))
8035 > HOST_BITS_PER_WIDE_INT)
8036 || exact_log2 (TREE_INT_CST_LOW (TREE_OPERAND (exp, 1))) < 0))
8038 (TREE_CODE (TREE_OPERAND (exp, 1)) == NOP_EXPR
8039 && (TYPE_PRECISION (TREE_TYPE
8040 (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
8041 == TYPE_PRECISION (TREE_TYPE
8043 (TREE_OPERAND (exp, 0), 0))))
8044 /* If both operands are extended, they must either both
8045 be zero-extended or both be sign-extended. */
8046 && (TYPE_UNSIGNED (TREE_TYPE
8047 (TREE_OPERAND (TREE_OPERAND (exp, 1), 0)))
8048 == TYPE_UNSIGNED (TREE_TYPE
8050 (TREE_OPERAND (exp, 0), 0)))))))
8052 tree op0type = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0));
8053 enum machine_mode innermode = TYPE_MODE (op0type);
8054 bool zextend_p = TYPE_UNSIGNED (op0type);
8055 optab other_optab = zextend_p ? smul_widen_optab : umul_widen_optab;
8056 this_optab = zextend_p ? umul_widen_optab : smul_widen_optab;
8058 if (mode == GET_MODE_2XWIDER_MODE (innermode))
8060 if (this_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
8062 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
8063 expand_operands (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
8064 TREE_OPERAND (exp, 1),
8065 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8067 expand_operands (TREE_OPERAND (TREE_OPERAND (exp, 0), 0),
8068 TREE_OPERAND (TREE_OPERAND (exp, 1), 0),
8069 NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8072 else if (other_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing
8073 && innermode == word_mode)
8076 op0 = expand_normal (TREE_OPERAND (TREE_OPERAND (exp, 0), 0));
8077 if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
8078 op1 = convert_modes (innermode, mode,
8079 expand_normal (TREE_OPERAND (exp, 1)),
8082 op1 = expand_normal (TREE_OPERAND (TREE_OPERAND (exp, 1), 0));
8083 temp = expand_binop (mode, other_optab, op0, op1, target,
8084 unsignedp, OPTAB_LIB_WIDEN);
8085 hipart = gen_highpart (innermode, temp);
8086 htem = expand_mult_highpart_adjust (innermode, hipart,
8090 emit_move_insn (hipart, htem);
8091 return REDUCE_BIT_FIELD (temp);
8095 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8096 subtarget, &op0, &op1, 0);
8097 return REDUCE_BIT_FIELD (expand_mult (mode, op0, op1, target, unsignedp));
8099 case TRUNC_DIV_EXPR:
8100 case FLOOR_DIV_EXPR:
8102 case ROUND_DIV_EXPR:
8103 case EXACT_DIV_EXPR:
8104 if (modifier == EXPAND_STACK_PARM)
8106 /* Possible optimization: compute the dividend with EXPAND_SUM
8107 then if the divisor is constant can optimize the case
8108 where some terms of the dividend have coeffs divisible by it. */
8109 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8110 subtarget, &op0, &op1, 0);
8111 return expand_divmod (0, code, mode, op0, op1, target, unsignedp);
8116 case TRUNC_MOD_EXPR:
8117 case FLOOR_MOD_EXPR:
8119 case ROUND_MOD_EXPR:
8120 if (modifier == EXPAND_STACK_PARM)
8122 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8123 subtarget, &op0, &op1, 0);
8124 return expand_divmod (1, code, mode, op0, op1, target, unsignedp);
8126 case FIX_ROUND_EXPR:
8127 case FIX_FLOOR_EXPR:
8129 gcc_unreachable (); /* Not used for C. */
8131 case FIX_TRUNC_EXPR:
8132 op0 = expand_normal (TREE_OPERAND (exp, 0));
8133 if (target == 0 || modifier == EXPAND_STACK_PARM)
8134 target = gen_reg_rtx (mode);
8135 expand_fix (target, op0, unsignedp);
8139 op0 = expand_normal (TREE_OPERAND (exp, 0));
8140 if (target == 0 || modifier == EXPAND_STACK_PARM)
8141 target = gen_reg_rtx (mode);
8142 /* expand_float can't figure out what to do if FROM has VOIDmode.
8143 So give it the correct mode. With -O, cse will optimize this. */
8144 if (GET_MODE (op0) == VOIDmode)
8145 op0 = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))),
8147 expand_float (target, op0,
8148 TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
8152 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8153 if (modifier == EXPAND_STACK_PARM)
8155 temp = expand_unop (mode,
8156 optab_for_tree_code (NEGATE_EXPR, type),
8159 return REDUCE_BIT_FIELD (temp);
8162 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8163 if (modifier == EXPAND_STACK_PARM)
8166 /* ABS_EXPR is not valid for complex arguments. */
8167 gcc_assert (GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
8168 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT);
8170 /* Unsigned abs is simply the operand. Testing here means we don't
8171 risk generating incorrect code below. */
8172 if (TYPE_UNSIGNED (type))
8175 return expand_abs (mode, op0, target, unsignedp,
8176 safe_from_p (target, TREE_OPERAND (exp, 0), 1));
8180 target = original_target;
8182 || modifier == EXPAND_STACK_PARM
8183 || (MEM_P (target) && MEM_VOLATILE_P (target))
8184 || GET_MODE (target) != mode
8186 && REGNO (target) < FIRST_PSEUDO_REGISTER))
8187 target = gen_reg_rtx (mode);
8188 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8189 target, &op0, &op1, 0);
8191 /* First try to do it with a special MIN or MAX instruction.
8192 If that does not win, use a conditional jump to select the proper
8194 this_optab = optab_for_tree_code (code, type);
8195 temp = expand_binop (mode, this_optab, op0, op1, target, unsignedp,
8200 /* At this point, a MEM target is no longer useful; we will get better
8203 if (! REG_P (target))
8204 target = gen_reg_rtx (mode);
8206 /* If op1 was placed in target, swap op0 and op1. */
8207 if (target != op0 && target == op1)
8214 /* We generate better code and avoid problems with op1 mentioning
8215 target by forcing op1 into a pseudo if it isn't a constant. */
8216 if (! CONSTANT_P (op1))
8217 op1 = force_reg (mode, op1);
8220 enum rtx_code comparison_code;
8223 if (code == MAX_EXPR)
8224 comparison_code = unsignedp ? GEU : GE;
8226 comparison_code = unsignedp ? LEU : LE;
8228 /* Canonicalize to comparisons against 0. */
8229 if (op1 == const1_rtx)
8231 /* Converting (a >= 1 ? a : 1) into (a > 0 ? a : 1)
8232 or (a != 0 ? a : 1) for unsigned.
8233 For MIN we are safe converting (a <= 1 ? a : 1)
8234 into (a <= 0 ? a : 1) */
8235 cmpop1 = const0_rtx;
8236 if (code == MAX_EXPR)
8237 comparison_code = unsignedp ? NE : GT;
8239 if (op1 == constm1_rtx && !unsignedp)
8241 /* Converting (a >= -1 ? a : -1) into (a >= 0 ? a : -1)
8242 and (a <= -1 ? a : -1) into (a < 0 ? a : -1) */
8243 cmpop1 = const0_rtx;
8244 if (code == MIN_EXPR)
8245 comparison_code = LT;
8247 #ifdef HAVE_conditional_move
8248 /* Use a conditional move if possible. */
8249 if (can_conditionally_move_p (mode))
8253 /* ??? Same problem as in expmed.c: emit_conditional_move
8254 forces a stack adjustment via compare_from_rtx, and we
8255 lose the stack adjustment if the sequence we are about
8256 to create is discarded. */
8257 do_pending_stack_adjust ();
8261 /* Try to emit the conditional move. */
8262 insn = emit_conditional_move (target, comparison_code,
8267 /* If we could do the conditional move, emit the sequence,
8271 rtx seq = get_insns ();
8277 /* Otherwise discard the sequence and fall back to code with
8283 emit_move_insn (target, op0);
8285 temp = gen_label_rtx ();
8286 do_compare_rtx_and_jump (target, cmpop1, comparison_code,
8287 unsignedp, mode, NULL_RTX, NULL_RTX, temp);
8289 emit_move_insn (target, op1);
8294 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8295 if (modifier == EXPAND_STACK_PARM)
8297 temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
8301 /* ??? Can optimize bitwise operations with one arg constant.
8302 Can optimize (a bitwise1 n) bitwise2 (a bitwise3 b)
8303 and (a bitwise1 b) bitwise2 b (etc)
8304 but that is probably not worth while. */
8306 /* BIT_AND_EXPR is for bitwise anding. TRUTH_AND_EXPR is for anding two
8307 boolean values when we want in all cases to compute both of them. In
8308 general it is fastest to do TRUTH_AND_EXPR by computing both operands
8309 as actual zero-or-1 values and then bitwise anding. In cases where
8310 there cannot be any side effects, better code would be made by
8311 treating TRUTH_AND_EXPR like TRUTH_ANDIF_EXPR; but the question is
8312 how to recognize those cases. */
8314 case TRUTH_AND_EXPR:
8315 code = BIT_AND_EXPR;
8320 code = BIT_IOR_EXPR;
8324 case TRUTH_XOR_EXPR:
8325 code = BIT_XOR_EXPR;
8333 if (! safe_from_p (subtarget, TREE_OPERAND (exp, 1), 1))
8335 if (modifier == EXPAND_STACK_PARM)
8337 op0 = expand_expr (TREE_OPERAND (exp, 0), subtarget, VOIDmode, 0);
8338 return expand_shift (code, mode, op0, TREE_OPERAND (exp, 1), target,
8341 /* Could determine the answer when only additive constants differ. Also,
8342 the addition of one can be handled by changing the condition. */
8349 case UNORDERED_EXPR:
8357 temp = do_store_flag (exp,
8358 modifier != EXPAND_STACK_PARM ? target : NULL_RTX,
8359 tmode != VOIDmode ? tmode : mode, 0);
8363 /* For foo != 0, load foo, and if it is nonzero load 1 instead. */
8364 if (code == NE_EXPR && integer_zerop (TREE_OPERAND (exp, 1))
8366 && REG_P (original_target)
8367 && (GET_MODE (original_target)
8368 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)))))
8370 temp = expand_expr (TREE_OPERAND (exp, 0), original_target,
8373 /* If temp is constant, we can just compute the result. */
8374 if (GET_CODE (temp) == CONST_INT)
8376 if (INTVAL (temp) != 0)
8377 emit_move_insn (target, const1_rtx);
8379 emit_move_insn (target, const0_rtx);
8384 if (temp != original_target)
8386 enum machine_mode mode1 = GET_MODE (temp);
8387 if (mode1 == VOIDmode)
8388 mode1 = tmode != VOIDmode ? tmode : mode;
8390 temp = copy_to_mode_reg (mode1, temp);
8393 op1 = gen_label_rtx ();
8394 emit_cmp_and_jump_insns (temp, const0_rtx, EQ, NULL_RTX,
8395 GET_MODE (temp), unsignedp, op1);
8396 emit_move_insn (temp, const1_rtx);
8401 /* If no set-flag instruction, must generate a conditional store
8402 into a temporary variable. Drop through and handle this
8407 || modifier == EXPAND_STACK_PARM
8408 || ! safe_from_p (target, exp, 1)
8409 /* Make sure we don't have a hard reg (such as function's return
8410 value) live across basic blocks, if not optimizing. */
8411 || (!optimize && REG_P (target)
8412 && REGNO (target) < FIRST_PSEUDO_REGISTER)))
8413 target = gen_reg_rtx (tmode != VOIDmode ? tmode : mode);
8416 emit_move_insn (target, const0_rtx);
8418 op1 = gen_label_rtx ();
8419 jumpifnot (exp, op1);
8422 emit_move_insn (target, const1_rtx);
8425 return ignore ? const0_rtx : target;
8427 case TRUTH_NOT_EXPR:
8428 if (modifier == EXPAND_STACK_PARM)
8430 op0 = expand_expr (TREE_OPERAND (exp, 0), target, VOIDmode, 0);
8431 /* The parser is careful to generate TRUTH_NOT_EXPR
8432 only with operands that are always zero or one. */
8433 temp = expand_binop (mode, xor_optab, op0, const1_rtx,
8434 target, 1, OPTAB_LIB_WIDEN);
8438 case STATEMENT_LIST:
8440 tree_stmt_iterator iter;
8442 gcc_assert (ignore);
8444 for (iter = tsi_start (exp); !tsi_end_p (iter); tsi_next (&iter))
8445 expand_expr (tsi_stmt (iter), const0_rtx, VOIDmode, modifier);
8450 /* A COND_EXPR with its type being VOID_TYPE represents a
8451 conditional jump and is handled in
8452 expand_gimple_cond_expr. */
8453 gcc_assert (!VOID_TYPE_P (TREE_TYPE (exp)));
8455 /* Note that COND_EXPRs whose type is a structure or union
8456 are required to be constructed to contain assignments of
8457 a temporary variable, so that we can evaluate them here
8458 for side effect only. If type is void, we must do likewise. */
8460 gcc_assert (!TREE_ADDRESSABLE (type)
8462 && TREE_TYPE (TREE_OPERAND (exp, 1)) != void_type_node
8463 && TREE_TYPE (TREE_OPERAND (exp, 2)) != void_type_node);
8465 /* If we are not to produce a result, we have no target. Otherwise,
8466 if a target was specified use it; it will not be used as an
8467 intermediate target unless it is safe. If no target, use a
8470 if (modifier != EXPAND_STACK_PARM
8472 && safe_from_p (original_target, TREE_OPERAND (exp, 0), 1)
8473 && GET_MODE (original_target) == mode
8474 #ifdef HAVE_conditional_move
8475 && (! can_conditionally_move_p (mode)
8476 || REG_P (original_target))
8478 && !MEM_P (original_target))
8479 temp = original_target;
8481 temp = assign_temp (type, 0, 0, 1);
8483 do_pending_stack_adjust ();
8485 op0 = gen_label_rtx ();
8486 op1 = gen_label_rtx ();
8487 jumpifnot (TREE_OPERAND (exp, 0), op0);
8488 store_expr (TREE_OPERAND (exp, 1), temp,
8489 modifier == EXPAND_STACK_PARM);
8491 emit_jump_insn (gen_jump (op1));
8494 store_expr (TREE_OPERAND (exp, 2), temp,
8495 modifier == EXPAND_STACK_PARM);
8502 target = expand_vec_cond_expr (exp, target);
8507 tree lhs = TREE_OPERAND (exp, 0);
8508 tree rhs = TREE_OPERAND (exp, 1);
8510 gcc_assert (ignore);
8512 /* Check for |= or &= of a bitfield of size one into another bitfield
8513 of size 1. In this case, (unless we need the result of the
8514 assignment) we can do this more efficiently with a
8515 test followed by an assignment, if necessary.
8517 ??? At this point, we can't get a BIT_FIELD_REF here. But if
8518 things change so we do, this code should be enhanced to
8520 if (TREE_CODE (lhs) == COMPONENT_REF
8521 && (TREE_CODE (rhs) == BIT_IOR_EXPR
8522 || TREE_CODE (rhs) == BIT_AND_EXPR)
8523 && TREE_OPERAND (rhs, 0) == lhs
8524 && TREE_CODE (TREE_OPERAND (rhs, 1)) == COMPONENT_REF
8525 && integer_onep (DECL_SIZE (TREE_OPERAND (lhs, 1)))
8526 && integer_onep (DECL_SIZE (TREE_OPERAND (TREE_OPERAND (rhs, 1), 1))))
8528 rtx label = gen_label_rtx ();
8529 int value = TREE_CODE (rhs) == BIT_IOR_EXPR;
8530 do_jump (TREE_OPERAND (rhs, 1),
8533 expand_assignment (lhs, build_int_cst (TREE_TYPE (rhs), value));
8534 do_pending_stack_adjust ();
8539 expand_assignment (lhs, rhs);
8545 if (!TREE_OPERAND (exp, 0))
8546 expand_null_return ();
8548 expand_return (TREE_OPERAND (exp, 0));
8552 return expand_expr_addr_expr (exp, target, tmode, modifier);
8555 /* Get the rtx code of the operands. */
8556 op0 = expand_normal (TREE_OPERAND (exp, 0));
8557 op1 = expand_normal (TREE_OPERAND (exp, 1));
8560 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
8562 /* Move the real (op0) and imaginary (op1) parts to their location. */
8563 write_complex_part (target, op0, false);
8564 write_complex_part (target, op1, true);
8569 op0 = expand_normal (TREE_OPERAND (exp, 0));
8570 return read_complex_part (op0, false);
8573 op0 = expand_normal (TREE_OPERAND (exp, 0));
8574 return read_complex_part (op0, true);
8577 expand_resx_expr (exp);
8580 case TRY_CATCH_EXPR:
8582 case EH_FILTER_EXPR:
8583 case TRY_FINALLY_EXPR:
8584 /* Lowered by tree-eh.c. */
8587 case WITH_CLEANUP_EXPR:
8588 case CLEANUP_POINT_EXPR:
8590 case CASE_LABEL_EXPR:
8596 case PREINCREMENT_EXPR:
8597 case PREDECREMENT_EXPR:
8598 case POSTINCREMENT_EXPR:
8599 case POSTDECREMENT_EXPR:
8602 case TRUTH_ANDIF_EXPR:
8603 case TRUTH_ORIF_EXPR:
8604 /* Lowered by gimplify.c. */
8608 return get_exception_pointer (cfun);
8611 return get_exception_filter (cfun);
8614 /* Function descriptors are not valid except for as
8615 initialization constants, and should not be expanded. */
8623 expand_label (TREE_OPERAND (exp, 0));
8627 expand_asm_expr (exp);
8630 case WITH_SIZE_EXPR:
8631 /* WITH_SIZE_EXPR expands to its first argument. The caller should
8632 have pulled out the size to use in whatever context it needed. */
8633 return expand_expr_real (TREE_OPERAND (exp, 0), original_target, tmode,
8636 case REALIGN_LOAD_EXPR:
8638 tree oprnd0 = TREE_OPERAND (exp, 0);
8639 tree oprnd1 = TREE_OPERAND (exp, 1);
8640 tree oprnd2 = TREE_OPERAND (exp, 2);
8643 this_optab = optab_for_tree_code (code, type);
8644 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8645 op2 = expand_normal (oprnd2);
8646 temp = expand_ternary_op (mode, this_optab, op0, op1, op2,
8654 tree oprnd0 = TREE_OPERAND (exp, 0);
8655 tree oprnd1 = TREE_OPERAND (exp, 1);
8656 tree oprnd2 = TREE_OPERAND (exp, 2);
8659 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, EXPAND_NORMAL);
8660 op2 = expand_normal (oprnd2);
8661 target = expand_widen_pattern_expr (exp, op0, op1, op2,
8666 case WIDEN_SUM_EXPR:
8668 tree oprnd0 = TREE_OPERAND (exp, 0);
8669 tree oprnd1 = TREE_OPERAND (exp, 1);
8671 expand_operands (oprnd0, oprnd1, NULL_RTX, &op0, &op1, 0);
8672 target = expand_widen_pattern_expr (exp, op0, NULL_RTX, op1,
8677 case REDUC_MAX_EXPR:
8678 case REDUC_MIN_EXPR:
8679 case REDUC_PLUS_EXPR:
8681 op0 = expand_normal (TREE_OPERAND (exp, 0));
8682 this_optab = optab_for_tree_code (code, type);
8683 temp = expand_unop (mode, this_optab, op0, target, unsignedp);
8688 case VEC_LSHIFT_EXPR:
8689 case VEC_RSHIFT_EXPR:
8691 target = expand_vec_shift_expr (exp, target);
8696 return lang_hooks.expand_expr (exp, original_target, tmode,
8700 /* Here to do an ordinary binary operator. */
8702 expand_operands (TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
8703 subtarget, &op0, &op1, 0);
8705 this_optab = optab_for_tree_code (code, type);
8707 if (modifier == EXPAND_STACK_PARM)
8709 temp = expand_binop (mode, this_optab, op0, op1, target,
8710 unsignedp, OPTAB_LIB_WIDEN);
8712 return REDUCE_BIT_FIELD (temp);
8714 #undef REDUCE_BIT_FIELD
8716 /* Subroutine of above: reduce EXP to the precision of TYPE (in the
8717 signedness of TYPE), possibly returning the result in TARGET. */
8719 reduce_to_bit_field_precision (rtx exp, rtx target, tree type)
8721 HOST_WIDE_INT prec = TYPE_PRECISION (type);
8722 if (target && GET_MODE (target) != GET_MODE (exp))
8724 if (TYPE_UNSIGNED (type))
8727 if (prec < HOST_BITS_PER_WIDE_INT)
8728 mask = immed_double_const (((unsigned HOST_WIDE_INT) 1 << prec) - 1, 0,
8731 mask = immed_double_const ((unsigned HOST_WIDE_INT) -1,
8732 ((unsigned HOST_WIDE_INT) 1
8733 << (prec - HOST_BITS_PER_WIDE_INT)) - 1,
8735 return expand_and (GET_MODE (exp), exp, mask, target);
8739 tree count = build_int_cst (NULL_TREE,
8740 GET_MODE_BITSIZE (GET_MODE (exp)) - prec);
8741 exp = expand_shift (LSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
8742 return expand_shift (RSHIFT_EXPR, GET_MODE (exp), exp, count, target, 0);
8746 /* Subroutine of above: returns 1 if OFFSET corresponds to an offset that
8747 when applied to the address of EXP produces an address known to be
8748 aligned more than BIGGEST_ALIGNMENT. */
8751 is_aligning_offset (tree offset, tree exp)
8753 /* Strip off any conversions. */
8754 while (TREE_CODE (offset) == NON_LVALUE_EXPR
8755 || TREE_CODE (offset) == NOP_EXPR
8756 || TREE_CODE (offset) == CONVERT_EXPR)
8757 offset = TREE_OPERAND (offset, 0);
8759 /* We must now have a BIT_AND_EXPR with a constant that is one less than
8760 power of 2 and which is larger than BIGGEST_ALIGNMENT. */
8761 if (TREE_CODE (offset) != BIT_AND_EXPR
8762 || !host_integerp (TREE_OPERAND (offset, 1), 1)
8763 || compare_tree_int (TREE_OPERAND (offset, 1),
8764 BIGGEST_ALIGNMENT / BITS_PER_UNIT) <= 0
8765 || !exact_log2 (tree_low_cst (TREE_OPERAND (offset, 1), 1) + 1) < 0)
8768 /* Look at the first operand of BIT_AND_EXPR and strip any conversion.
8769 It must be NEGATE_EXPR. Then strip any more conversions. */
8770 offset = TREE_OPERAND (offset, 0);
8771 while (TREE_CODE (offset) == NON_LVALUE_EXPR
8772 || TREE_CODE (offset) == NOP_EXPR
8773 || TREE_CODE (offset) == CONVERT_EXPR)
8774 offset = TREE_OPERAND (offset, 0);
8776 if (TREE_CODE (offset) != NEGATE_EXPR)
8779 offset = TREE_OPERAND (offset, 0);
8780 while (TREE_CODE (offset) == NON_LVALUE_EXPR
8781 || TREE_CODE (offset) == NOP_EXPR
8782 || TREE_CODE (offset) == CONVERT_EXPR)
8783 offset = TREE_OPERAND (offset, 0);
8785 /* This must now be the address of EXP. */
8786 return TREE_CODE (offset) == ADDR_EXPR && TREE_OPERAND (offset, 0) == exp;
8789 /* Return the tree node if an ARG corresponds to a string constant or zero
8790 if it doesn't. If we return nonzero, set *PTR_OFFSET to the offset
8791 in bytes within the string that ARG is accessing. The type of the
8792 offset will be `sizetype'. */
8795 string_constant (tree arg, tree *ptr_offset)
8800 if (TREE_CODE (arg) == ADDR_EXPR)
8802 if (TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)
8804 *ptr_offset = size_zero_node;
8805 return TREE_OPERAND (arg, 0);
8807 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == VAR_DECL)
8809 array = TREE_OPERAND (arg, 0);
8810 offset = size_zero_node;
8812 else if (TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF)
8814 array = TREE_OPERAND (TREE_OPERAND (arg, 0), 0);
8815 offset = TREE_OPERAND (TREE_OPERAND (arg, 0), 1);
8816 if (TREE_CODE (array) != STRING_CST
8817 && TREE_CODE (array) != VAR_DECL)
8823 else if (TREE_CODE (arg) == PLUS_EXPR)
8825 tree arg0 = TREE_OPERAND (arg, 0);
8826 tree arg1 = TREE_OPERAND (arg, 1);
8831 if (TREE_CODE (arg0) == ADDR_EXPR
8832 && (TREE_CODE (TREE_OPERAND (arg0, 0)) == STRING_CST
8833 || TREE_CODE (TREE_OPERAND (arg0, 0)) == VAR_DECL))
8835 array = TREE_OPERAND (arg0, 0);
8838 else if (TREE_CODE (arg1) == ADDR_EXPR
8839 && (TREE_CODE (TREE_OPERAND (arg1, 0)) == STRING_CST
8840 || TREE_CODE (TREE_OPERAND (arg1, 0)) == VAR_DECL))
8842 array = TREE_OPERAND (arg1, 0);
8851 if (TREE_CODE (array) == STRING_CST)
8853 *ptr_offset = fold_convert (sizetype, offset);
8856 else if (TREE_CODE (array) == VAR_DECL)
8860 /* Variables initialized to string literals can be handled too. */
8861 if (DECL_INITIAL (array) == NULL_TREE
8862 || TREE_CODE (DECL_INITIAL (array)) != STRING_CST)
8865 /* If they are read-only, non-volatile and bind locally. */
8866 if (! TREE_READONLY (array)
8867 || TREE_SIDE_EFFECTS (array)
8868 || ! targetm.binds_local_p (array))
8871 /* Avoid const char foo[4] = "abcde"; */
8872 if (DECL_SIZE_UNIT (array) == NULL_TREE
8873 || TREE_CODE (DECL_SIZE_UNIT (array)) != INTEGER_CST
8874 || (length = TREE_STRING_LENGTH (DECL_INITIAL (array))) <= 0
8875 || compare_tree_int (DECL_SIZE_UNIT (array), length) < 0)
8878 /* If variable is bigger than the string literal, OFFSET must be constant
8879 and inside of the bounds of the string literal. */
8880 offset = fold_convert (sizetype, offset);
8881 if (compare_tree_int (DECL_SIZE_UNIT (array), length) > 0
8882 && (! host_integerp (offset, 1)
8883 || compare_tree_int (offset, length) >= 0))
8886 *ptr_offset = offset;
8887 return DECL_INITIAL (array);
8893 /* Generate code to calculate EXP using a store-flag instruction
8894 and return an rtx for the result. EXP is either a comparison
8895 or a TRUTH_NOT_EXPR whose operand is a comparison.
8897 If TARGET is nonzero, store the result there if convenient.
8899 If ONLY_CHEAP is nonzero, only do this if it is likely to be very
8902 Return zero if there is no suitable set-flag instruction
8903 available on this machine.
8905 Once expand_expr has been called on the arguments of the comparison,
8906 we are committed to doing the store flag, since it is not safe to
8907 re-evaluate the expression. We emit the store-flag insn by calling
8908 emit_store_flag, but only expand the arguments if we have a reason
8909 to believe that emit_store_flag will be successful. If we think that
8910 it will, but it isn't, we have to simulate the store-flag with a
8911 set/jump/set sequence. */
8914 do_store_flag (tree exp, rtx target, enum machine_mode mode, int only_cheap)
8917 tree arg0, arg1, type;
8919 enum machine_mode operand_mode;
8923 enum insn_code icode;
8924 rtx subtarget = target;
8927 /* If this is a TRUTH_NOT_EXPR, set a flag indicating we must invert the
8928 result at the end. We can't simply invert the test since it would
8929 have already been inverted if it were valid. This case occurs for
8930 some floating-point comparisons. */
8932 if (TREE_CODE (exp) == TRUTH_NOT_EXPR)
8933 invert = 1, exp = TREE_OPERAND (exp, 0);
8935 arg0 = TREE_OPERAND (exp, 0);
8936 arg1 = TREE_OPERAND (exp, 1);
8938 /* Don't crash if the comparison was erroneous. */
8939 if (arg0 == error_mark_node || arg1 == error_mark_node)
8942 type = TREE_TYPE (arg0);
8943 operand_mode = TYPE_MODE (type);
8944 unsignedp = TYPE_UNSIGNED (type);
8946 /* We won't bother with BLKmode store-flag operations because it would mean
8947 passing a lot of information to emit_store_flag. */
8948 if (operand_mode == BLKmode)
8951 /* We won't bother with store-flag operations involving function pointers
8952 when function pointers must be canonicalized before comparisons. */
8953 #ifdef HAVE_canonicalize_funcptr_for_compare
8954 if (HAVE_canonicalize_funcptr_for_compare
8955 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
8956 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
8958 || (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
8959 && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
8960 == FUNCTION_TYPE))))
8967 /* Get the rtx comparison code to use. We know that EXP is a comparison
8968 operation of some type. Some comparisons against 1 and -1 can be
8969 converted to comparisons with zero. Do so here so that the tests
8970 below will be aware that we have a comparison with zero. These
8971 tests will not catch constants in the first operand, but constants
8972 are rarely passed as the first operand. */
8974 switch (TREE_CODE (exp))
8983 if (integer_onep (arg1))
8984 arg1 = integer_zero_node, code = unsignedp ? LEU : LE;
8986 code = unsignedp ? LTU : LT;
8989 if (! unsignedp && integer_all_onesp (arg1))
8990 arg1 = integer_zero_node, code = LT;
8992 code = unsignedp ? LEU : LE;
8995 if (! unsignedp && integer_all_onesp (arg1))
8996 arg1 = integer_zero_node, code = GE;
8998 code = unsignedp ? GTU : GT;
9001 if (integer_onep (arg1))
9002 arg1 = integer_zero_node, code = unsignedp ? GTU : GT;
9004 code = unsignedp ? GEU : GE;
9007 case UNORDERED_EXPR:
9036 /* Put a constant second. */
9037 if (TREE_CODE (arg0) == REAL_CST || TREE_CODE (arg0) == INTEGER_CST)
9039 tem = arg0; arg0 = arg1; arg1 = tem;
9040 code = swap_condition (code);
9043 /* If this is an equality or inequality test of a single bit, we can
9044 do this by shifting the bit being tested to the low-order bit and
9045 masking the result with the constant 1. If the condition was EQ,
9046 we xor it with 1. This does not require an scc insn and is faster
9047 than an scc insn even if we have it.
9049 The code to make this transformation was moved into fold_single_bit_test,
9050 so we just call into the folder and expand its result. */
9052 if ((code == NE || code == EQ)
9053 && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1)
9054 && integer_pow2p (TREE_OPERAND (arg0, 1)))
9056 tree type = lang_hooks.types.type_for_mode (mode, unsignedp);
9057 return expand_expr (fold_single_bit_test (code == NE ? NE_EXPR : EQ_EXPR,
9059 target, VOIDmode, EXPAND_NORMAL);
9062 /* Now see if we are likely to be able to do this. Return if not. */
9063 if (! can_compare_p (code, operand_mode, ccp_store_flag))
9066 icode = setcc_gen_code[(int) code];
9067 if (icode == CODE_FOR_nothing
9068 || (only_cheap && insn_data[(int) icode].operand[0].mode != mode))
9070 /* We can only do this if it is one of the special cases that
9071 can be handled without an scc insn. */
9072 if ((code == LT && integer_zerop (arg1))
9073 || (! only_cheap && code == GE && integer_zerop (arg1)))
9075 else if (! only_cheap && (code == NE || code == EQ)
9076 && TREE_CODE (type) != REAL_TYPE
9077 && ((abs_optab->handlers[(int) operand_mode].insn_code
9078 != CODE_FOR_nothing)
9079 || (ffs_optab->handlers[(int) operand_mode].insn_code
9080 != CODE_FOR_nothing)))
9086 if (! get_subtarget (target)
9087 || GET_MODE (subtarget) != operand_mode)
9090 expand_operands (arg0, arg1, subtarget, &op0, &op1, 0);
9093 target = gen_reg_rtx (mode);
9095 result = emit_store_flag (target, code, op0, op1,
9096 operand_mode, unsignedp, 1);
9101 result = expand_binop (mode, xor_optab, result, const1_rtx,
9102 result, 0, OPTAB_LIB_WIDEN);
9106 /* If this failed, we have to do this with set/compare/jump/set code. */
9108 || reg_mentioned_p (target, op0) || reg_mentioned_p (target, op1))
9109 target = gen_reg_rtx (GET_MODE (target));
9111 emit_move_insn (target, invert ? const0_rtx : const1_rtx);
9112 result = compare_from_rtx (op0, op1, code, unsignedp,
9113 operand_mode, NULL_RTX);
9114 if (GET_CODE (result) == CONST_INT)
9115 return (((result == const0_rtx && ! invert)
9116 || (result != const0_rtx && invert))
9117 ? const0_rtx : const1_rtx);
9119 /* The code of RESULT may not match CODE if compare_from_rtx
9120 decided to swap its operands and reverse the original code.
9122 We know that compare_from_rtx returns either a CONST_INT or
9123 a new comparison code, so it is safe to just extract the
9124 code from RESULT. */
9125 code = GET_CODE (result);
9127 label = gen_label_rtx ();
9128 gcc_assert (bcc_gen_fctn[(int) code]);
9130 emit_jump_insn ((*bcc_gen_fctn[(int) code]) (label));
9131 emit_move_insn (target, invert ? const1_rtx : const0_rtx);
9138 /* Stubs in case we haven't got a casesi insn. */
9140 # define HAVE_casesi 0
9141 # define gen_casesi(a, b, c, d, e) (0)
9142 # define CODE_FOR_casesi CODE_FOR_nothing
9145 /* If the machine does not have a case insn that compares the bounds,
9146 this means extra overhead for dispatch tables, which raises the
9147 threshold for using them. */
9148 #ifndef CASE_VALUES_THRESHOLD
9149 #define CASE_VALUES_THRESHOLD (HAVE_casesi ? 4 : 5)
9150 #endif /* CASE_VALUES_THRESHOLD */
9153 case_values_threshold (void)
9155 return CASE_VALUES_THRESHOLD;
9158 /* Attempt to generate a casesi instruction. Returns 1 if successful,
9159 0 otherwise (i.e. if there is no casesi instruction). */
9161 try_casesi (tree index_type, tree index_expr, tree minval, tree range,
9162 rtx table_label ATTRIBUTE_UNUSED, rtx default_label)
9164 enum machine_mode index_mode = SImode;
9165 int index_bits = GET_MODE_BITSIZE (index_mode);
9166 rtx op1, op2, index;
9167 enum machine_mode op_mode;
9172 /* Convert the index to SImode. */
9173 if (GET_MODE_BITSIZE (TYPE_MODE (index_type)) > GET_MODE_BITSIZE (index_mode))
9175 enum machine_mode omode = TYPE_MODE (index_type);
9176 rtx rangertx = expand_normal (range);
9178 /* We must handle the endpoints in the original mode. */
9179 index_expr = build2 (MINUS_EXPR, index_type,
9180 index_expr, minval);
9181 minval = integer_zero_node;
9182 index = expand_normal (index_expr);
9183 emit_cmp_and_jump_insns (rangertx, index, LTU, NULL_RTX,
9184 omode, 1, default_label);
9185 /* Now we can safely truncate. */
9186 index = convert_to_mode (index_mode, index, 0);
9190 if (TYPE_MODE (index_type) != index_mode)
9192 index_type = lang_hooks.types.type_for_size (index_bits, 0);
9193 index_expr = fold_convert (index_type, index_expr);
9196 index = expand_normal (index_expr);
9199 do_pending_stack_adjust ();
9201 op_mode = insn_data[(int) CODE_FOR_casesi].operand[0].mode;
9202 if (! (*insn_data[(int) CODE_FOR_casesi].operand[0].predicate)
9204 index = copy_to_mode_reg (op_mode, index);
9206 op1 = expand_normal (minval);
9208 op_mode = insn_data[(int) CODE_FOR_casesi].operand[1].mode;
9209 op1 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (minval)),
9210 op1, TYPE_UNSIGNED (TREE_TYPE (minval)));
9211 if (! (*insn_data[(int) CODE_FOR_casesi].operand[1].predicate)
9213 op1 = copy_to_mode_reg (op_mode, op1);
9215 op2 = expand_normal (range);
9217 op_mode = insn_data[(int) CODE_FOR_casesi].operand[2].mode;
9218 op2 = convert_modes (op_mode, TYPE_MODE (TREE_TYPE (range)),
9219 op2, TYPE_UNSIGNED (TREE_TYPE (range)));
9220 if (! (*insn_data[(int) CODE_FOR_casesi].operand[2].predicate)
9222 op2 = copy_to_mode_reg (op_mode, op2);
9224 emit_jump_insn (gen_casesi (index, op1, op2,
9225 table_label, default_label));
9229 /* Attempt to generate a tablejump instruction; same concept. */
9230 #ifndef HAVE_tablejump
9231 #define HAVE_tablejump 0
9232 #define gen_tablejump(x, y) (0)
9235 /* Subroutine of the next function.
9237 INDEX is the value being switched on, with the lowest value
9238 in the table already subtracted.
9239 MODE is its expected mode (needed if INDEX is constant).
9240 RANGE is the length of the jump table.
9241 TABLE_LABEL is a CODE_LABEL rtx for the table itself.
9243 DEFAULT_LABEL is a CODE_LABEL rtx to jump to if the
9244 index value is out of range. */
9247 do_tablejump (rtx index, enum machine_mode mode, rtx range, rtx table_label,
9252 if (INTVAL (range) > cfun->max_jumptable_ents)
9253 cfun->max_jumptable_ents = INTVAL (range);
9255 /* Do an unsigned comparison (in the proper mode) between the index
9256 expression and the value which represents the length of the range.
9257 Since we just finished subtracting the lower bound of the range
9258 from the index expression, this comparison allows us to simultaneously
9259 check that the original index expression value is both greater than
9260 or equal to the minimum value of the range and less than or equal to
9261 the maximum value of the range. */
9263 emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1,
9266 /* If index is in range, it must fit in Pmode.
9267 Convert to Pmode so we can index with it. */
9269 index = convert_to_mode (Pmode, index, 1);
9271 /* Don't let a MEM slip through, because then INDEX that comes
9272 out of PIC_CASE_VECTOR_ADDRESS won't be a valid address,
9273 and break_out_memory_refs will go to work on it and mess it up. */
9274 #ifdef PIC_CASE_VECTOR_ADDRESS
9275 if (flag_pic && !REG_P (index))
9276 index = copy_to_mode_reg (Pmode, index);
9279 /* If flag_force_addr were to affect this address
9280 it could interfere with the tricky assumptions made
9281 about addresses that contain label-refs,
9282 which may be valid only very near the tablejump itself. */
9283 /* ??? The only correct use of CASE_VECTOR_MODE is the one inside the
9284 GET_MODE_SIZE, because this indicates how large insns are. The other
9285 uses should all be Pmode, because they are addresses. This code
9286 could fail if addresses and insns are not the same size. */
9287 index = gen_rtx_PLUS (Pmode,
9288 gen_rtx_MULT (Pmode, index,
9289 GEN_INT (GET_MODE_SIZE (CASE_VECTOR_MODE))),
9290 gen_rtx_LABEL_REF (Pmode, table_label));
9291 #ifdef PIC_CASE_VECTOR_ADDRESS
9293 index = PIC_CASE_VECTOR_ADDRESS (index);
9296 index = memory_address_noforce (CASE_VECTOR_MODE, index);
9297 temp = gen_reg_rtx (CASE_VECTOR_MODE);
9298 vector = gen_const_mem (CASE_VECTOR_MODE, index);
9299 convert_move (temp, vector, 0);
9301 emit_jump_insn (gen_tablejump (temp, table_label));
9303 /* If we are generating PIC code or if the table is PC-relative, the
9304 table and JUMP_INSN must be adjacent, so don't output a BARRIER. */
9305 if (! CASE_VECTOR_PC_RELATIVE && ! flag_pic)
9310 try_tablejump (tree index_type, tree index_expr, tree minval, tree range,
9311 rtx table_label, rtx default_label)
9315 if (! HAVE_tablejump)
9318 index_expr = fold_build2 (MINUS_EXPR, index_type,
9319 fold_convert (index_type, index_expr),
9320 fold_convert (index_type, minval));
9321 index = expand_normal (index_expr);
9322 do_pending_stack_adjust ();
9324 do_tablejump (index, TYPE_MODE (index_type),
9325 convert_modes (TYPE_MODE (index_type),
9326 TYPE_MODE (TREE_TYPE (range)),
9327 expand_normal (range),
9328 TYPE_UNSIGNED (TREE_TYPE (range))),
9329 table_label, default_label);
9333 /* Nonzero if the mode is a valid vector mode for this architecture.
9334 This returns nonzero even if there is no hardware support for the
9335 vector mode, but we can emulate with narrower modes. */
9338 vector_mode_valid_p (enum machine_mode mode)
9340 enum mode_class class = GET_MODE_CLASS (mode);
9341 enum machine_mode innermode;
9343 /* Doh! What's going on? */
9344 if (class != MODE_VECTOR_INT
9345 && class != MODE_VECTOR_FLOAT)
9348 /* Hardware support. Woo hoo! */
9349 if (targetm.vector_mode_supported_p (mode))
9352 innermode = GET_MODE_INNER (mode);
9354 /* We should probably return 1 if requesting V4DI and we have no DI,
9355 but we have V2DI, but this is probably very unlikely. */
9357 /* If we have support for the inner mode, we can safely emulate it.
9358 We may not have V2DI, but me can emulate with a pair of DIs. */
9359 return targetm.scalar_mode_supported_p (innermode);
9362 /* Return a CONST_VECTOR rtx for a VECTOR_CST tree. */
9364 const_vector_from_tree (tree exp)
9369 enum machine_mode inner, mode;
9371 mode = TYPE_MODE (TREE_TYPE (exp));
9373 if (initializer_zerop (exp))
9374 return CONST0_RTX (mode);
9376 units = GET_MODE_NUNITS (mode);
9377 inner = GET_MODE_INNER (mode);
9379 v = rtvec_alloc (units);
9381 link = TREE_VECTOR_CST_ELTS (exp);
9382 for (i = 0; link; link = TREE_CHAIN (link), ++i)
9384 elt = TREE_VALUE (link);
9386 if (TREE_CODE (elt) == REAL_CST)
9387 RTVEC_ELT (v, i) = CONST_DOUBLE_FROM_REAL_VALUE (TREE_REAL_CST (elt),
9390 RTVEC_ELT (v, i) = immed_double_const (TREE_INT_CST_LOW (elt),
9391 TREE_INT_CST_HIGH (elt),
9395 /* Initialize remaining elements to 0. */
9396 for (; i < units; ++i)
9397 RTVEC_ELT (v, i) = CONST0_RTX (inner);
9399 return gen_rtx_CONST_VECTOR (mode, v);
9401 #include "gt-expr.h"