1 /* Subroutines for manipulating rtx's in semantically interesting ways.
2 Copyright (C) 1987, 1991, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
32 #include "hard-reg-set.h"
33 #include "insn-config.h"
35 #include "insn-flags.h"
36 #include "insn-codes.h"
38 #if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY
39 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
42 static rtx break_out_memory_refs
PARAMS ((rtx
));
43 static void emit_stack_probe
PARAMS ((rtx
));
46 /* Truncate and perhaps sign-extend C as appropriate for MODE. */
49 trunc_int_for_mode (c
, mode
)
51 enum machine_mode mode
;
53 int width
= GET_MODE_BITSIZE (mode
);
55 /* We clear out all bits that don't belong in MODE, unless they and our
56 sign bit are all one. So we get either a reasonable negative
57 value or a reasonable unsigned value. */
59 if (width
< HOST_BITS_PER_WIDE_INT
60 && ((c
& ((HOST_WIDE_INT
) (-1) << (width
- 1)))
61 != ((HOST_WIDE_INT
) (-1) << (width
- 1))))
62 c
&= ((HOST_WIDE_INT
) 1 << width
) - 1;
64 /* If this would be an entire word for the target, but is not for
65 the host, then sign-extend on the host so that the number will look
66 the same way on the host that it would on the target.
68 For example, when building a 64 bit alpha hosted 32 bit sparc
69 targeted compiler, then we want the 32 bit unsigned value -1 to be
70 represented as a 64 bit value -1, and not as 0x00000000ffffffff.
71 The later confuses the sparc backend. */
73 if (BITS_PER_WORD
< HOST_BITS_PER_WIDE_INT
74 && BITS_PER_WORD
== width
75 && (c
& ((HOST_WIDE_INT
) 1 << (width
- 1))))
76 c
|= ((HOST_WIDE_INT
) (-1) << width
);
81 /* Return an rtx for the sum of X and the integer C.
83 This function should be used via the `plus_constant' macro. */
86 plus_constant_wide (x
, c
)
88 register HOST_WIDE_INT c
;
90 register RTX_CODE code
;
91 register enum machine_mode mode
;
105 return GEN_INT (INTVAL (x
) + c
);
109 unsigned HOST_WIDE_INT l1
= CONST_DOUBLE_LOW (x
);
110 HOST_WIDE_INT h1
= CONST_DOUBLE_HIGH (x
);
111 unsigned HOST_WIDE_INT l2
= c
;
112 HOST_WIDE_INT h2
= c
< 0 ? ~0 : 0;
113 unsigned HOST_WIDE_INT lv
;
116 add_double (l1
, h1
, l2
, h2
, &lv
, &hv
);
118 return immed_double_const (lv
, hv
, VOIDmode
);
122 /* If this is a reference to the constant pool, try replacing it with
123 a reference to a new constant. If the resulting address isn't
124 valid, don't return it because we have no way to validize it. */
125 if (GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
126 && CONSTANT_POOL_ADDRESS_P (XEXP (x
, 0)))
128 /* Any rtl we create here must go in a saveable obstack, since
129 we might have been called from within combine. */
130 push_obstacks_nochange ();
131 rtl_in_saveable_obstack ();
133 = force_const_mem (GET_MODE (x
),
134 plus_constant (get_pool_constant (XEXP (x
, 0)),
137 if (memory_address_p (GET_MODE (tem
), XEXP (tem
, 0)))
143 /* If adding to something entirely constant, set a flag
144 so that we can add a CONST around the result. */
155 /* The interesting case is adding the integer to a sum.
156 Look for constant term in the sum and combine
157 with C. For an integer constant term, we make a combined
158 integer. For a constant term that is not an explicit integer,
159 we cannot really combine, but group them together anyway.
161 Restart or use a recursive call in case the remaining operand is
162 something that we handle specially, such as a SYMBOL_REF.
164 We may not immediately return from the recursive call here, lest
165 all_constant gets lost. */
167 if (GET_CODE (XEXP (x
, 1)) == CONST_INT
)
169 c
+= INTVAL (XEXP (x
, 1));
171 if (GET_MODE (x
) != VOIDmode
)
172 c
= trunc_int_for_mode (c
, GET_MODE (x
));
177 else if (CONSTANT_P (XEXP (x
, 0)))
179 x
= gen_rtx_PLUS (mode
,
180 plus_constant (XEXP (x
, 0), c
),
184 else if (CONSTANT_P (XEXP (x
, 1)))
186 x
= gen_rtx_PLUS (mode
,
188 plus_constant (XEXP (x
, 1), c
));
198 x
= gen_rtx_PLUS (mode
, x
, GEN_INT (c
));
200 if (GET_CODE (x
) == SYMBOL_REF
|| GET_CODE (x
) == LABEL_REF
)
202 else if (all_constant
)
203 return gen_rtx_CONST (mode
, x
);
208 /* This is the same as `plus_constant', except that it handles LO_SUM.
210 This function should be used via the `plus_constant_for_output' macro. */
213 plus_constant_for_output_wide (x
, c
)
215 register HOST_WIDE_INT c
;
217 register enum machine_mode mode
= GET_MODE (x
);
219 if (GET_CODE (x
) == LO_SUM
)
220 return gen_rtx_LO_SUM (mode
, XEXP (x
, 0),
221 plus_constant_for_output (XEXP (x
, 1), c
));
224 return plus_constant (x
, c
);
227 /* If X is a sum, return a new sum like X but lacking any constant terms.
228 Add all the removed constant terms into *CONSTPTR.
229 X itself is not altered. The result != X if and only if
230 it is not isomorphic to X. */
233 eliminate_constant_term (x
, constptr
)
240 if (GET_CODE (x
) != PLUS
)
243 /* First handle constants appearing at this level explicitly. */
244 if (GET_CODE (XEXP (x
, 1)) == CONST_INT
245 && 0 != (tem
= simplify_binary_operation (PLUS
, GET_MODE (x
), *constptr
,
247 && GET_CODE (tem
) == CONST_INT
)
250 return eliminate_constant_term (XEXP (x
, 0), constptr
);
254 x0
= eliminate_constant_term (XEXP (x
, 0), &tem
);
255 x1
= eliminate_constant_term (XEXP (x
, 1), &tem
);
256 if ((x1
!= XEXP (x
, 1) || x0
!= XEXP (x
, 0))
257 && 0 != (tem
= simplify_binary_operation (PLUS
, GET_MODE (x
),
259 && GET_CODE (tem
) == CONST_INT
)
262 return gen_rtx_PLUS (GET_MODE (x
), x0
, x1
);
268 /* Returns the insn that next references REG after INSN, or 0
269 if REG is clobbered before next referenced or we cannot find
270 an insn that references REG in a straight-line piece of code. */
273 find_next_ref (reg
, insn
)
279 for (insn
= NEXT_INSN (insn
); insn
; insn
= next
)
281 next
= NEXT_INSN (insn
);
282 if (GET_CODE (insn
) == NOTE
)
284 if (GET_CODE (insn
) == CODE_LABEL
285 || GET_CODE (insn
) == BARRIER
)
287 if (GET_CODE (insn
) == INSN
288 || GET_CODE (insn
) == JUMP_INSN
289 || GET_CODE (insn
) == CALL_INSN
)
291 if (reg_set_p (reg
, insn
))
293 if (reg_mentioned_p (reg
, PATTERN (insn
)))
295 if (GET_CODE (insn
) == JUMP_INSN
)
297 if (simplejump_p (insn
))
298 next
= JUMP_LABEL (insn
);
302 if (GET_CODE (insn
) == CALL_INSN
303 && REGNO (reg
) < FIRST_PSEUDO_REGISTER
304 && call_used_regs
[REGNO (reg
)])
313 /* Return an rtx for the size in bytes of the value of EXP. */
319 tree size
= size_in_bytes (TREE_TYPE (exp
));
321 if (TREE_CODE (size
) != INTEGER_CST
322 && contains_placeholder_p (size
))
323 size
= build (WITH_RECORD_EXPR
, sizetype
, size
, exp
);
325 return expand_expr (size
, NULL_RTX
, TYPE_MODE (sizetype
),
326 EXPAND_MEMORY_USE_BAD
);
329 /* Return a copy of X in which all memory references
330 and all constants that involve symbol refs
331 have been replaced with new temporary registers.
332 Also emit code to load the memory locations and constants
333 into those registers.
335 If X contains no such constants or memory references,
336 X itself (not a copy) is returned.
338 If a constant is found in the address that is not a legitimate constant
339 in an insn, it is left alone in the hope that it might be valid in the
342 X may contain no arithmetic except addition, subtraction and multiplication.
343 Values returned by expand_expr with 1 for sum_ok fit this constraint. */
346 break_out_memory_refs (x
)
349 if (GET_CODE (x
) == MEM
350 || (CONSTANT_P (x
) && CONSTANT_ADDRESS_P (x
)
351 && GET_MODE (x
) != VOIDmode
))
352 x
= force_reg (GET_MODE (x
), x
);
353 else if (GET_CODE (x
) == PLUS
|| GET_CODE (x
) == MINUS
354 || GET_CODE (x
) == MULT
)
356 register rtx op0
= break_out_memory_refs (XEXP (x
, 0));
357 register rtx op1
= break_out_memory_refs (XEXP (x
, 1));
359 if (op0
!= XEXP (x
, 0) || op1
!= XEXP (x
, 1))
360 x
= gen_rtx_fmt_ee (GET_CODE (x
), Pmode
, op0
, op1
);
366 #ifdef POINTERS_EXTEND_UNSIGNED
368 /* Given X, a memory address in ptr_mode, convert it to an address
369 in Pmode, or vice versa (TO_MODE says which way). We take advantage of
370 the fact that pointers are not allowed to overflow by commuting arithmetic
371 operations over conversions so that address arithmetic insns can be
375 convert_memory_address (to_mode
, x
)
376 enum machine_mode to_mode
;
379 enum machine_mode from_mode
= to_mode
== ptr_mode
? Pmode
: ptr_mode
;
382 /* Here we handle some special cases. If none of them apply, fall through
383 to the default case. */
384 switch (GET_CODE (x
))
391 temp
= gen_rtx_LABEL_REF (to_mode
, XEXP (x
, 0));
392 LABEL_REF_NONLOCAL_P (temp
) = LABEL_REF_NONLOCAL_P (x
);
396 temp
= gen_rtx_SYMBOL_REF (to_mode
, XSTR (x
, 0));
397 SYMBOL_REF_FLAG (temp
) = SYMBOL_REF_FLAG (x
);
398 CONSTANT_POOL_ADDRESS_P (temp
) = CONSTANT_POOL_ADDRESS_P (x
);
402 return gen_rtx_CONST (to_mode
,
403 convert_memory_address (to_mode
, XEXP (x
, 0)));
407 /* For addition the second operand is a small constant, we can safely
408 permute the conversion and addition operation. We can always safely
409 permute them if we are making the address narrower. In addition,
410 always permute the operations if this is a constant. */
411 if (GET_MODE_SIZE (to_mode
) < GET_MODE_SIZE (from_mode
)
412 || (GET_CODE (x
) == PLUS
&& GET_CODE (XEXP (x
, 1)) == CONST_INT
413 && (INTVAL (XEXP (x
, 1)) + 20000 < 40000
414 || CONSTANT_P (XEXP (x
, 0)))))
415 return gen_rtx_fmt_ee (GET_CODE (x
), to_mode
,
416 convert_memory_address (to_mode
, XEXP (x
, 0)),
417 convert_memory_address (to_mode
, XEXP (x
, 1)));
424 return convert_modes (to_mode
, from_mode
,
425 x
, POINTERS_EXTEND_UNSIGNED
);
429 /* Given a memory address or facsimile X, construct a new address,
430 currently equivalent, that is stable: future stores won't change it.
432 X must be composed of constants, register and memory references
433 combined with addition, subtraction and multiplication:
434 in other words, just what you can get from expand_expr if sum_ok is 1.
436 Works by making copies of all regs and memory locations used
437 by X and combining them the same way X does.
438 You could also stabilize the reference to this address
439 by copying the address to a register with copy_to_reg;
440 but then you wouldn't get indexed addressing in the reference. */
446 if (GET_CODE (x
) == REG
)
448 if (REGNO (x
) != FRAME_POINTER_REGNUM
449 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
450 && REGNO (x
) != HARD_FRAME_POINTER_REGNUM
455 else if (GET_CODE (x
) == MEM
)
457 else if (GET_CODE (x
) == PLUS
|| GET_CODE (x
) == MINUS
458 || GET_CODE (x
) == MULT
)
460 register rtx op0
= copy_all_regs (XEXP (x
, 0));
461 register rtx op1
= copy_all_regs (XEXP (x
, 1));
462 if (op0
!= XEXP (x
, 0) || op1
!= XEXP (x
, 1))
463 x
= gen_rtx_fmt_ee (GET_CODE (x
), Pmode
, op0
, op1
);
468 /* Return something equivalent to X but valid as a memory address
469 for something of mode MODE. When X is not itself valid, this
470 works by copying X or subexpressions of it into registers. */
473 memory_address (mode
, x
)
474 enum machine_mode mode
;
477 register rtx oldx
= x
;
479 if (GET_CODE (x
) == ADDRESSOF
)
482 #ifdef POINTERS_EXTEND_UNSIGNED
483 if (GET_MODE (x
) == ptr_mode
)
484 x
= convert_memory_address (Pmode
, x
);
487 /* By passing constant addresses thru registers
488 we get a chance to cse them. */
489 if (! cse_not_expected
&& CONSTANT_P (x
) && CONSTANT_ADDRESS_P (x
))
490 x
= force_reg (Pmode
, x
);
492 /* Accept a QUEUED that refers to a REG
493 even though that isn't a valid address.
494 On attempting to put this in an insn we will call protect_from_queue
495 which will turn it into a REG, which is valid. */
496 else if (GET_CODE (x
) == QUEUED
497 && GET_CODE (QUEUED_VAR (x
)) == REG
)
500 /* We get better cse by rejecting indirect addressing at this stage.
501 Let the combiner create indirect addresses where appropriate.
502 For now, generate the code so that the subexpressions useful to share
503 are visible. But not if cse won't be done! */
506 if (! cse_not_expected
&& GET_CODE (x
) != REG
)
507 x
= break_out_memory_refs (x
);
509 /* At this point, any valid address is accepted. */
510 GO_IF_LEGITIMATE_ADDRESS (mode
, x
, win
);
512 /* If it was valid before but breaking out memory refs invalidated it,
513 use it the old way. */
514 if (memory_address_p (mode
, oldx
))
517 /* Perform machine-dependent transformations on X
518 in certain cases. This is not necessary since the code
519 below can handle all possible cases, but machine-dependent
520 transformations can make better code. */
521 LEGITIMIZE_ADDRESS (x
, oldx
, mode
, win
);
523 /* PLUS and MULT can appear in special ways
524 as the result of attempts to make an address usable for indexing.
525 Usually they are dealt with by calling force_operand, below.
526 But a sum containing constant terms is special
527 if removing them makes the sum a valid address:
528 then we generate that address in a register
529 and index off of it. We do this because it often makes
530 shorter code, and because the addresses thus generated
531 in registers often become common subexpressions. */
532 if (GET_CODE (x
) == PLUS
)
534 rtx constant_term
= const0_rtx
;
535 rtx y
= eliminate_constant_term (x
, &constant_term
);
536 if (constant_term
== const0_rtx
537 || ! memory_address_p (mode
, y
))
538 x
= force_operand (x
, NULL_RTX
);
541 y
= gen_rtx_PLUS (GET_MODE (x
), copy_to_reg (y
), constant_term
);
542 if (! memory_address_p (mode
, y
))
543 x
= force_operand (x
, NULL_RTX
);
549 else if (GET_CODE (x
) == MULT
|| GET_CODE (x
) == MINUS
)
550 x
= force_operand (x
, NULL_RTX
);
552 /* If we have a register that's an invalid address,
553 it must be a hard reg of the wrong class. Copy it to a pseudo. */
554 else if (GET_CODE (x
) == REG
)
557 /* Last resort: copy the value to a register, since
558 the register is a valid address. */
560 x
= force_reg (Pmode
, x
);
567 if (flag_force_addr
&& ! cse_not_expected
&& GET_CODE (x
) != REG
568 /* Don't copy an addr via a reg if it is one of our stack slots. */
569 && ! (GET_CODE (x
) == PLUS
570 && (XEXP (x
, 0) == virtual_stack_vars_rtx
571 || XEXP (x
, 0) == virtual_incoming_args_rtx
)))
573 if (general_operand (x
, Pmode
))
574 x
= force_reg (Pmode
, x
);
576 x
= force_operand (x
, NULL_RTX
);
582 /* If we didn't change the address, we are done. Otherwise, mark
583 a reg as a pointer if we have REG or REG + CONST_INT. */
586 else if (GET_CODE (x
) == REG
)
587 mark_reg_pointer (x
, BITS_PER_UNIT
);
588 else if (GET_CODE (x
) == PLUS
589 && GET_CODE (XEXP (x
, 0)) == REG
590 && GET_CODE (XEXP (x
, 1)) == CONST_INT
)
591 mark_reg_pointer (XEXP (x
, 0), BITS_PER_UNIT
);
593 /* OLDX may have been the address on a temporary. Update the address
594 to indicate that X is now used. */
595 update_temp_slot_address (oldx
, x
);
600 /* Like `memory_address' but pretend `flag_force_addr' is 0. */
603 memory_address_noforce (mode
, x
)
604 enum machine_mode mode
;
607 int ambient_force_addr
= flag_force_addr
;
611 val
= memory_address (mode
, x
);
612 flag_force_addr
= ambient_force_addr
;
616 /* Convert a mem ref into one with a valid memory address.
617 Pass through anything else unchanged. */
623 if (GET_CODE (ref
) != MEM
)
625 if (memory_address_p (GET_MODE (ref
), XEXP (ref
, 0)))
627 /* Don't alter REF itself, since that is probably a stack slot. */
628 return change_address (ref
, GET_MODE (ref
), XEXP (ref
, 0));
631 /* Return a modified copy of X with its memory address copied
632 into a temporary register to protect it from side effects.
633 If X is not a MEM, it is returned unchanged (and not copied).
634 Perhaps even if it is a MEM, if there is no need to change it. */
641 if (GET_CODE (x
) != MEM
)
644 if (rtx_unstable_p (addr
))
646 rtx temp
= copy_all_regs (addr
);
649 if (GET_CODE (temp
) != REG
)
650 temp
= copy_to_reg (temp
);
651 mem
= gen_rtx_MEM (GET_MODE (x
), temp
);
653 /* Mark returned memref with in_struct if it's in an array or
654 structure. Copy everything else from original memref. */
656 MEM_COPY_ATTRIBUTES (mem
, x
);
657 if (GET_CODE (addr
) == PLUS
)
658 MEM_SET_IN_STRUCT_P (mem
, 1);
665 /* Copy the value or contents of X to a new temp reg and return that reg. */
671 register rtx temp
= gen_reg_rtx (GET_MODE (x
));
673 /* If not an operand, must be an address with PLUS and MULT so
674 do the computation. */
675 if (! general_operand (x
, VOIDmode
))
676 x
= force_operand (x
, temp
);
679 emit_move_insn (temp
, x
);
684 /* Like copy_to_reg but always give the new register mode Pmode
685 in case X is a constant. */
691 return copy_to_mode_reg (Pmode
, x
);
694 /* Like copy_to_reg but always give the new register mode MODE
695 in case X is a constant. */
698 copy_to_mode_reg (mode
, x
)
699 enum machine_mode mode
;
702 register rtx temp
= gen_reg_rtx (mode
);
704 /* If not an operand, must be an address with PLUS and MULT so
705 do the computation. */
706 if (! general_operand (x
, VOIDmode
))
707 x
= force_operand (x
, temp
);
709 if (GET_MODE (x
) != mode
&& GET_MODE (x
) != VOIDmode
)
712 emit_move_insn (temp
, x
);
716 /* Load X into a register if it is not already one.
717 Use mode MODE for the register.
718 X should be valid for mode MODE, but it may be a constant which
719 is valid for all integer modes; that's why caller must specify MODE.
721 The caller must not alter the value in the register we return,
722 since we mark it as a "constant" register. */
726 enum machine_mode mode
;
729 register rtx temp
, insn
, set
;
731 if (GET_CODE (x
) == REG
)
734 temp
= gen_reg_rtx (mode
);
736 if (! general_operand (x
, mode
))
737 x
= force_operand (x
, NULL_RTX
);
739 insn
= emit_move_insn (temp
, x
);
741 /* Let optimizers know that TEMP's value never changes
742 and that X can be substituted for it. Don't get confused
743 if INSN set something else (such as a SUBREG of TEMP). */
745 && (set
= single_set (insn
)) != 0
746 && SET_DEST (set
) == temp
)
748 rtx note
= find_reg_note (insn
, REG_EQUAL
, NULL_RTX
);
753 REG_NOTES (insn
) = gen_rtx_EXPR_LIST (REG_EQUAL
, x
, REG_NOTES (insn
));
758 /* If X is a memory ref, copy its contents to a new temp reg and return
759 that reg. Otherwise, return X. */
766 if (GET_CODE (x
) != MEM
|| GET_MODE (x
) == BLKmode
)
768 temp
= gen_reg_rtx (GET_MODE (x
));
769 emit_move_insn (temp
, x
);
773 /* Copy X to TARGET (if it's nonzero and a reg)
774 or to a new temp reg and return that reg.
775 MODE is the mode to use for X in case it is a constant. */
778 copy_to_suggested_reg (x
, target
, mode
)
780 enum machine_mode mode
;
784 if (target
&& GET_CODE (target
) == REG
)
787 temp
= gen_reg_rtx (mode
);
789 emit_move_insn (temp
, x
);
793 /* Return the mode to use to store a scalar of TYPE and MODE.
794 PUNSIGNEDP points to the signedness of the type and may be adjusted
795 to show what signedness to use on extension operations.
797 FOR_CALL is non-zero if this call is promoting args for a call. */
800 promote_mode (type
, mode
, punsignedp
, for_call
)
802 enum machine_mode mode
;
804 int for_call ATTRIBUTE_UNUSED
;
806 enum tree_code code
= TREE_CODE (type
);
807 int unsignedp
= *punsignedp
;
809 #ifdef PROMOTE_FOR_CALL_ONLY
817 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
818 case CHAR_TYPE
: case REAL_TYPE
: case OFFSET_TYPE
:
819 PROMOTE_MODE (mode
, unsignedp
, type
);
823 #ifdef POINTERS_EXTEND_UNSIGNED
827 unsignedp
= POINTERS_EXTEND_UNSIGNED
;
835 *punsignedp
= unsignedp
;
839 /* Adjust the stack pointer by ADJUST (an rtx for a number of bytes).
840 This pops when ADJUST is positive. ADJUST need not be constant. */
843 adjust_stack (adjust
)
847 adjust
= protect_from_queue (adjust
, 0);
849 if (adjust
== const0_rtx
)
852 /* We expect all variable sized adjustments to be multiple of
853 PREFERRED_STACK_BOUNDARY. */
854 if (GET_CODE (adjust
) == CONST_INT
)
855 stack_pointer_delta
-= INTVAL (adjust
);
857 temp
= expand_binop (Pmode
,
858 #ifdef STACK_GROWS_DOWNWARD
863 stack_pointer_rtx
, adjust
, stack_pointer_rtx
, 0,
866 if (temp
!= stack_pointer_rtx
)
867 emit_move_insn (stack_pointer_rtx
, temp
);
870 /* Adjust the stack pointer by minus ADJUST (an rtx for a number of bytes).
871 This pushes when ADJUST is positive. ADJUST need not be constant. */
874 anti_adjust_stack (adjust
)
878 adjust
= protect_from_queue (adjust
, 0);
880 if (adjust
== const0_rtx
)
883 /* We expect all variable sized adjustments to be multiple of
884 PREFERRED_STACK_BOUNDARY. */
885 if (GET_CODE (adjust
) == CONST_INT
)
886 stack_pointer_delta
+= INTVAL (adjust
);
888 temp
= expand_binop (Pmode
,
889 #ifdef STACK_GROWS_DOWNWARD
894 stack_pointer_rtx
, adjust
, stack_pointer_rtx
, 0,
897 if (temp
!= stack_pointer_rtx
)
898 emit_move_insn (stack_pointer_rtx
, temp
);
901 /* Round the size of a block to be pushed up to the boundary required
902 by this machine. SIZE is the desired size, which need not be constant. */
908 #ifdef PREFERRED_STACK_BOUNDARY
909 int align
= PREFERRED_STACK_BOUNDARY
/ BITS_PER_UNIT
;
912 if (GET_CODE (size
) == CONST_INT
)
914 int new = (INTVAL (size
) + align
- 1) / align
* align
;
915 if (INTVAL (size
) != new)
916 size
= GEN_INT (new);
920 /* CEIL_DIV_EXPR needs to worry about the addition overflowing,
921 but we know it can't. So add ourselves and then do
923 size
= expand_binop (Pmode
, add_optab
, size
, GEN_INT (align
- 1),
924 NULL_RTX
, 1, OPTAB_LIB_WIDEN
);
925 size
= expand_divmod (0, TRUNC_DIV_EXPR
, Pmode
, size
, GEN_INT (align
),
927 size
= expand_mult (Pmode
, size
, GEN_INT (align
), NULL_RTX
, 1);
929 #endif /* PREFERRED_STACK_BOUNDARY */
933 /* Save the stack pointer for the purpose in SAVE_LEVEL. PSAVE is a pointer
934 to a previously-created save area. If no save area has been allocated,
935 this function will allocate one. If a save area is specified, it
936 must be of the proper mode.
938 The insns are emitted after insn AFTER, if nonzero, otherwise the insns
939 are emitted at the current position. */
942 emit_stack_save (save_level
, psave
, after
)
943 enum save_level save_level
;
948 /* The default is that we use a move insn and save in a Pmode object. */
949 rtx (*fcn
) PARAMS ((rtx
, rtx
)) = gen_move_insn
;
950 enum machine_mode mode
= STACK_SAVEAREA_MODE (save_level
);
952 /* See if this machine has anything special to do for this kind of save. */
955 #ifdef HAVE_save_stack_block
957 if (HAVE_save_stack_block
)
958 fcn
= gen_save_stack_block
;
961 #ifdef HAVE_save_stack_function
963 if (HAVE_save_stack_function
)
964 fcn
= gen_save_stack_function
;
967 #ifdef HAVE_save_stack_nonlocal
969 if (HAVE_save_stack_nonlocal
)
970 fcn
= gen_save_stack_nonlocal
;
977 /* If there is no save area and we have to allocate one, do so. Otherwise
978 verify the save area is the proper mode. */
982 if (mode
!= VOIDmode
)
984 if (save_level
== SAVE_NONLOCAL
)
985 *psave
= sa
= assign_stack_local (mode
, GET_MODE_SIZE (mode
), 0);
987 *psave
= sa
= gen_reg_rtx (mode
);
992 if (mode
== VOIDmode
|| GET_MODE (sa
) != mode
)
1001 /* We must validize inside the sequence, to ensure that any instructions
1002 created by the validize call also get moved to the right place. */
1004 sa
= validize_mem (sa
);
1005 emit_insn (fcn (sa
, stack_pointer_rtx
));
1006 seq
= gen_sequence ();
1008 emit_insn_after (seq
, after
);
1013 sa
= validize_mem (sa
);
1014 emit_insn (fcn (sa
, stack_pointer_rtx
));
1018 /* Restore the stack pointer for the purpose in SAVE_LEVEL. SA is the save
1019 area made by emit_stack_save. If it is zero, we have nothing to do.
1021 Put any emitted insns after insn AFTER, if nonzero, otherwise at
1022 current position. */
1025 emit_stack_restore (save_level
, sa
, after
)
1026 enum save_level save_level
;
1030 /* The default is that we use a move insn. */
1031 rtx (*fcn
) PARAMS ((rtx
, rtx
)) = gen_move_insn
;
1033 /* See if this machine has anything special to do for this kind of save. */
1036 #ifdef HAVE_restore_stack_block
1038 if (HAVE_restore_stack_block
)
1039 fcn
= gen_restore_stack_block
;
1042 #ifdef HAVE_restore_stack_function
1044 if (HAVE_restore_stack_function
)
1045 fcn
= gen_restore_stack_function
;
1048 #ifdef HAVE_restore_stack_nonlocal
1050 if (HAVE_restore_stack_nonlocal
)
1051 fcn
= gen_restore_stack_nonlocal
;
1059 sa
= validize_mem (sa
);
1066 emit_insn (fcn (stack_pointer_rtx
, sa
));
1067 seq
= gen_sequence ();
1069 emit_insn_after (seq
, after
);
1072 emit_insn (fcn (stack_pointer_rtx
, sa
));
1075 #ifdef SETJMP_VIA_SAVE_AREA
1076 /* Optimize RTL generated by allocate_dynamic_stack_space for targets
1077 where SETJMP_VIA_SAVE_AREA is true. The problem is that on these
1078 platforms, the dynamic stack space used can corrupt the original
1079 frame, thus causing a crash if a longjmp unwinds to it. */
1082 optimize_save_area_alloca (insns
)
1087 for (insn
= insns
; insn
; insn
= NEXT_INSN(insn
))
1091 if (GET_CODE (insn
) != INSN
)
1094 for (note
= REG_NOTES (insn
); note
; note
= XEXP (note
, 1))
1096 if (REG_NOTE_KIND (note
) != REG_SAVE_AREA
)
1099 if (!current_function_calls_setjmp
)
1101 rtx pat
= PATTERN (insn
);
1103 /* If we do not see the note in a pattern matching
1104 these precise characteristics, we did something
1105 entirely wrong in allocate_dynamic_stack_space.
1107 Note, one way this could happen is if SETJMP_VIA_SAVE_AREA
1108 was defined on a machine where stacks grow towards higher
1111 Right now only supported port with stack that grow upward
1112 is the HPPA and it does not define SETJMP_VIA_SAVE_AREA. */
1113 if (GET_CODE (pat
) != SET
1114 || SET_DEST (pat
) != stack_pointer_rtx
1115 || GET_CODE (SET_SRC (pat
)) != MINUS
1116 || XEXP (SET_SRC (pat
), 0) != stack_pointer_rtx
)
1119 /* This will now be transformed into a (set REG REG)
1120 so we can just blow away all the other notes. */
1121 XEXP (SET_SRC (pat
), 1) = XEXP (note
, 0);
1122 REG_NOTES (insn
) = NULL_RTX
;
1126 /* setjmp was called, we must remove the REG_SAVE_AREA
1127 note so that later passes do not get confused by its
1129 if (note
== REG_NOTES (insn
))
1131 REG_NOTES (insn
) = XEXP (note
, 1);
1137 for (srch
= REG_NOTES (insn
); srch
; srch
= XEXP (srch
, 1))
1138 if (XEXP (srch
, 1) == note
)
1141 if (srch
== NULL_RTX
)
1144 XEXP (srch
, 1) = XEXP (note
, 1);
1147 /* Once we've seen the note of interest, we need not look at
1148 the rest of them. */
1153 #endif /* SETJMP_VIA_SAVE_AREA */
1155 /* Return an rtx representing the address of an area of memory dynamically
1156 pushed on the stack. This region of memory is always aligned to
1157 a multiple of BIGGEST_ALIGNMENT.
1159 Any required stack pointer alignment is preserved.
1161 SIZE is an rtx representing the size of the area.
1162 TARGET is a place in which the address can be placed.
1164 KNOWN_ALIGN is the alignment (in bits) that we know SIZE has. */
1167 allocate_dynamic_stack_space (size
, target
, known_align
)
1172 #ifdef SETJMP_VIA_SAVE_AREA
1173 rtx setjmpless_size
= NULL_RTX
;
1176 /* If we're asking for zero bytes, it doesn't matter what we point
1177 to since we can't dereference it. But return a reasonable
1179 if (size
== const0_rtx
)
1180 return virtual_stack_dynamic_rtx
;
1182 /* Otherwise, show we're calling alloca or equivalent. */
1183 current_function_calls_alloca
= 1;
1185 /* Ensure the size is in the proper mode. */
1186 if (GET_MODE (size
) != VOIDmode
&& GET_MODE (size
) != Pmode
)
1187 size
= convert_to_mode (Pmode
, size
, 1);
1189 /* We can't attempt to minimize alignment necessary, because we don't
1190 know the final value of preferred_stack_boundary yet while executing
1192 #ifdef PREFERRED_STACK_BOUNDARY
1193 cfun
->preferred_stack_boundary
= PREFERRED_STACK_BOUNDARY
;
1196 /* We will need to ensure that the address we return is aligned to
1197 BIGGEST_ALIGNMENT. If STACK_DYNAMIC_OFFSET is defined, we don't
1198 always know its final value at this point in the compilation (it
1199 might depend on the size of the outgoing parameter lists, for
1200 example), so we must align the value to be returned in that case.
1201 (Note that STACK_DYNAMIC_OFFSET will have a default non-zero value if
1202 STACK_POINTER_OFFSET or ACCUMULATE_OUTGOING_ARGS are defined).
1203 We must also do an alignment operation on the returned value if
1204 the stack pointer alignment is less strict that BIGGEST_ALIGNMENT.
1206 If we have to align, we must leave space in SIZE for the hole
1207 that might result from the alignment operation. */
1209 #if defined (STACK_DYNAMIC_OFFSET) || defined (STACK_POINTER_OFFSET) || ! defined (PREFERRED_STACK_BOUNDARY)
1210 #define MUST_ALIGN 1
1212 #define MUST_ALIGN (PREFERRED_STACK_BOUNDARY < BIGGEST_ALIGNMENT)
1217 if (GET_CODE (size
) == CONST_INT
)
1218 size
= GEN_INT (INTVAL (size
)
1219 + (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
- 1));
1221 size
= expand_binop (Pmode
, add_optab
, size
,
1222 GEN_INT (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
- 1),
1223 NULL_RTX
, 1, OPTAB_LIB_WIDEN
);
1226 #ifdef SETJMP_VIA_SAVE_AREA
1227 /* If setjmp restores regs from a save area in the stack frame,
1228 avoid clobbering the reg save area. Note that the offset of
1229 virtual_incoming_args_rtx includes the preallocated stack args space.
1230 It would be no problem to clobber that, but it's on the wrong side
1231 of the old save area. */
1234 = expand_binop (Pmode
, sub_optab
, virtual_stack_dynamic_rtx
,
1235 stack_pointer_rtx
, NULL_RTX
, 1, OPTAB_LIB_WIDEN
);
1237 if (!current_function_calls_setjmp
)
1239 int align
= PREFERRED_STACK_BOUNDARY
/ BITS_PER_UNIT
;
1241 /* See optimize_save_area_alloca to understand what is being
1244 #if !defined(PREFERRED_STACK_BOUNDARY) || !defined(MUST_ALIGN) || (PREFERRED_STACK_BOUNDARY != BIGGEST_ALIGNMENT)
1245 /* If anyone creates a target with these characteristics, let them
1246 know that our optimization cannot work correctly in such a case. */
1250 if (GET_CODE (size
) == CONST_INT
)
1252 int new = INTVAL (size
) / align
* align
;
1254 if (INTVAL (size
) != new)
1255 setjmpless_size
= GEN_INT (new);
1257 setjmpless_size
= size
;
1261 /* Since we know overflow is not possible, we avoid using
1262 CEIL_DIV_EXPR and use TRUNC_DIV_EXPR instead. */
1263 setjmpless_size
= expand_divmod (0, TRUNC_DIV_EXPR
, Pmode
, size
,
1264 GEN_INT (align
), NULL_RTX
, 1);
1265 setjmpless_size
= expand_mult (Pmode
, setjmpless_size
,
1266 GEN_INT (align
), NULL_RTX
, 1);
1268 /* Our optimization works based upon being able to perform a simple
1269 transformation of this RTL into a (set REG REG) so make sure things
1270 did in fact end up in a REG. */
1271 if (!register_operand (setjmpless_size
, Pmode
))
1272 setjmpless_size
= force_reg (Pmode
, setjmpless_size
);
1275 size
= expand_binop (Pmode
, add_optab
, size
, dynamic_offset
,
1276 NULL_RTX
, 1, OPTAB_LIB_WIDEN
);
1278 #endif /* SETJMP_VIA_SAVE_AREA */
1280 /* Round the size to a multiple of the required stack alignment.
1281 Since the stack if presumed to be rounded before this allocation,
1282 this will maintain the required alignment.
1284 If the stack grows downward, we could save an insn by subtracting
1285 SIZE from the stack pointer and then aligning the stack pointer.
1286 The problem with this is that the stack pointer may be unaligned
1287 between the execution of the subtraction and alignment insns and
1288 some machines do not allow this. Even on those that do, some
1289 signal handlers malfunction if a signal should occur between those
1290 insns. Since this is an extremely rare event, we have no reliable
1291 way of knowing which systems have this problem. So we avoid even
1292 momentarily mis-aligning the stack. */
1294 #ifdef PREFERRED_STACK_BOUNDARY
1295 /* If we added a variable amount to SIZE,
1296 we can no longer assume it is aligned. */
1297 #if !defined (SETJMP_VIA_SAVE_AREA)
1298 if (MUST_ALIGN
|| known_align
% PREFERRED_STACK_BOUNDARY
!= 0)
1300 size
= round_push (size
);
1303 do_pending_stack_adjust ();
1305 /* We ought to be called always on the toplevel and stack ought to be aligned
1307 #ifdef PREFERRED_STACK_BOUNDARY
1308 if (stack_pointer_delta
% (PREFERRED_STACK_BOUNDARY
/ BITS_PER_UNIT
))
1312 /* If needed, check that we have the required amount of stack. Take into
1313 account what has already been checked. */
1314 if (flag_stack_check
&& ! STACK_CHECK_BUILTIN
)
1315 probe_stack_range (STACK_CHECK_MAX_FRAME_SIZE
+ STACK_CHECK_PROTECT
, size
);
1317 /* Don't use a TARGET that isn't a pseudo. */
1318 if (target
== 0 || GET_CODE (target
) != REG
1319 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
1320 target
= gen_reg_rtx (Pmode
);
1322 mark_reg_pointer (target
, known_align
);
1324 /* Perform the required allocation from the stack. Some systems do
1325 this differently than simply incrementing/decrementing from the
1326 stack pointer, such as acquiring the space by calling malloc(). */
1327 #ifdef HAVE_allocate_stack
1328 if (HAVE_allocate_stack
)
1330 enum machine_mode mode
= STACK_SIZE_MODE
;
1331 insn_operand_predicate_fn pred
;
1333 pred
= insn_data
[(int) CODE_FOR_allocate_stack
].operand
[0].predicate
;
1334 if (pred
&& ! ((*pred
) (target
, Pmode
)))
1335 #ifdef POINTERS_EXTEND_UNSIGNED
1336 target
= convert_memory_address (Pmode
, target
);
1338 target
= copy_to_mode_reg (Pmode
, target
);
1341 if (mode
== VOIDmode
)
1344 size
= convert_modes (mode
, ptr_mode
, size
, 1);
1345 pred
= insn_data
[(int) CODE_FOR_allocate_stack
].operand
[1].predicate
;
1346 if (pred
&& ! ((*pred
) (size
, mode
)))
1347 size
= copy_to_mode_reg (mode
, size
);
1349 emit_insn (gen_allocate_stack (target
, size
));
1354 #ifndef STACK_GROWS_DOWNWARD
1355 emit_move_insn (target
, virtual_stack_dynamic_rtx
);
1357 size
= convert_modes (Pmode
, ptr_mode
, size
, 1);
1359 /* Check stack bounds if necessary. */
1360 if (current_function_limit_stack
)
1363 rtx space_available
= gen_label_rtx ();
1364 #ifdef STACK_GROWS_DOWNWARD
1365 available
= expand_binop (Pmode
, sub_optab
,
1366 stack_pointer_rtx
, stack_limit_rtx
,
1367 NULL_RTX
, 1, OPTAB_WIDEN
);
1369 available
= expand_binop (Pmode
, sub_optab
,
1370 stack_limit_rtx
, stack_pointer_rtx
,
1371 NULL_RTX
, 1, OPTAB_WIDEN
);
1373 emit_cmp_and_jump_insns (available
, size
, GEU
, NULL_RTX
, Pmode
, 1,
1374 0, space_available
);
1377 emit_insn (gen_trap ());
1380 error ("stack limits not supported on this target");
1382 emit_label (space_available
);
1385 anti_adjust_stack (size
);
1386 #ifdef SETJMP_VIA_SAVE_AREA
1387 if (setjmpless_size
!= NULL_RTX
)
1389 rtx note_target
= get_last_insn ();
1391 REG_NOTES (note_target
)
1392 = gen_rtx_EXPR_LIST (REG_SAVE_AREA
, setjmpless_size
,
1393 REG_NOTES (note_target
));
1395 #endif /* SETJMP_VIA_SAVE_AREA */
1396 #ifdef STACK_GROWS_DOWNWARD
1397 emit_move_insn (target
, virtual_stack_dynamic_rtx
);
1403 /* CEIL_DIV_EXPR needs to worry about the addition overflowing,
1404 but we know it can't. So add ourselves and then do
1406 target
= expand_binop (Pmode
, add_optab
, target
,
1407 GEN_INT (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
- 1),
1408 NULL_RTX
, 1, OPTAB_LIB_WIDEN
);
1409 target
= expand_divmod (0, TRUNC_DIV_EXPR
, Pmode
, target
,
1410 GEN_INT (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
),
1412 target
= expand_mult (Pmode
, target
,
1413 GEN_INT (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
),
1417 /* Some systems require a particular insn to refer to the stack
1418 to make the pages exist. */
1421 emit_insn (gen_probe ());
1424 /* Record the new stack level for nonlocal gotos. */
1425 if (nonlocal_goto_handler_slots
!= 0)
1426 emit_stack_save (SAVE_NONLOCAL
, &nonlocal_goto_stack_level
, NULL_RTX
);
1431 /* A front end may want to override GCC's stack checking by providing a
1432 run-time routine to call to check the stack, so provide a mechanism for
1433 calling that routine. */
1435 static rtx stack_check_libfunc
;
1438 set_stack_check_libfunc (libfunc
)
1441 stack_check_libfunc
= libfunc
;
1444 /* Emit one stack probe at ADDRESS, an address within the stack. */
1447 emit_stack_probe (address
)
1450 rtx memref
= gen_rtx_MEM (word_mode
, address
);
1452 MEM_VOLATILE_P (memref
) = 1;
1454 if (STACK_CHECK_PROBE_LOAD
)
1455 emit_move_insn (gen_reg_rtx (word_mode
), memref
);
1457 emit_move_insn (memref
, const0_rtx
);
1460 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
1461 FIRST is a constant and size is a Pmode RTX. These are offsets from the
1462 current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
1463 subtract from the stack. If SIZE is constant, this is done
1464 with a fixed number of probes. Otherwise, we must make a loop. */
1466 #ifdef STACK_GROWS_DOWNWARD
1467 #define STACK_GROW_OP MINUS
1469 #define STACK_GROW_OP PLUS
1473 probe_stack_range (first
, size
)
1474 HOST_WIDE_INT first
;
1477 /* First see if the front end has set up a function for us to call to
1479 if (stack_check_libfunc
!= 0)
1480 emit_library_call (stack_check_libfunc
, 0, VOIDmode
, 1,
1481 memory_address (QImode
,
1482 gen_rtx (STACK_GROW_OP
, Pmode
,
1484 plus_constant (size
, first
))),
1487 /* Next see if we have an insn to check the stack. Use it if so. */
1488 #ifdef HAVE_check_stack
1489 else if (HAVE_check_stack
)
1491 insn_operand_predicate_fn pred
;
1493 = force_operand (gen_rtx_STACK_GROW_OP (Pmode
,
1495 plus_constant (size
, first
)),
1498 pred
= insn_data
[(int) CODE_FOR_check_stack
].operand
[0].predicate
;
1499 if (pred
&& ! ((*pred
) (last_addr
, Pmode
)))
1500 last_addr
= copy_to_mode_reg (Pmode
, last_addr
);
1502 emit_insn (gen_check_stack (last_addr
));
1506 /* If we have to generate explicit probes, see if we have a constant
1507 small number of them to generate. If so, that's the easy case. */
1508 else if (GET_CODE (size
) == CONST_INT
1509 && INTVAL (size
) < 10 * STACK_CHECK_PROBE_INTERVAL
)
1511 HOST_WIDE_INT offset
;
1513 /* Start probing at FIRST + N * STACK_CHECK_PROBE_INTERVAL
1514 for values of N from 1 until it exceeds LAST. If only one
1515 probe is needed, this will not generate any code. Then probe
1517 for (offset
= first
+ STACK_CHECK_PROBE_INTERVAL
;
1518 offset
< INTVAL (size
);
1519 offset
= offset
+ STACK_CHECK_PROBE_INTERVAL
)
1520 emit_stack_probe (gen_rtx_fmt_ee (STACK_GROW_OP
, Pmode
,
1524 emit_stack_probe (gen_rtx_fmt_ee (STACK_GROW_OP
, Pmode
,
1526 plus_constant (size
, first
)));
1529 /* In the variable case, do the same as above, but in a loop. We emit loop
1530 notes so that loop optimization can be done. */
1534 = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP
, Pmode
,
1536 GEN_INT (first
+ STACK_CHECK_PROBE_INTERVAL
)),
1539 = force_operand (gen_rtx_fmt_ee (STACK_GROW_OP
, Pmode
,
1541 plus_constant (size
, first
)),
1543 rtx incr
= GEN_INT (STACK_CHECK_PROBE_INTERVAL
);
1544 rtx loop_lab
= gen_label_rtx ();
1545 rtx test_lab
= gen_label_rtx ();
1546 rtx end_lab
= gen_label_rtx ();
1549 if (GET_CODE (test_addr
) != REG
1550 || REGNO (test_addr
) < FIRST_PSEUDO_REGISTER
)
1551 test_addr
= force_reg (Pmode
, test_addr
);
1553 emit_note (NULL_PTR
, NOTE_INSN_LOOP_BEG
);
1554 emit_jump (test_lab
);
1556 emit_label (loop_lab
);
1557 emit_stack_probe (test_addr
);
1559 emit_note (NULL_PTR
, NOTE_INSN_LOOP_CONT
);
1561 #ifdef STACK_GROWS_DOWNWARD
1562 #define CMP_OPCODE GTU
1563 temp
= expand_binop (Pmode
, sub_optab
, test_addr
, incr
, test_addr
,
1566 #define CMP_OPCODE LTU
1567 temp
= expand_binop (Pmode
, add_optab
, test_addr
, incr
, test_addr
,
1571 if (temp
!= test_addr
)
1574 emit_label (test_lab
);
1575 emit_cmp_and_jump_insns (test_addr
, last_addr
, CMP_OPCODE
,
1576 NULL_RTX
, Pmode
, 1, 0, loop_lab
);
1577 emit_jump (end_lab
);
1578 emit_note (NULL_PTR
, NOTE_INSN_LOOP_END
);
1579 emit_label (end_lab
);
1581 emit_stack_probe (last_addr
);
1585 /* Return an rtx representing the register or memory location
1586 in which a scalar value of data type VALTYPE
1587 was returned by a function call to function FUNC.
1588 FUNC is a FUNCTION_DECL node if the precise function is known,
1590 OUTGOING is 1 if on a machine with register windows this function
1591 should return the register in which the function will put its result
1595 hard_function_value (valtype
, func
, outgoing
)
1597 tree func ATTRIBUTE_UNUSED
;
1598 int outgoing ATTRIBUTE_UNUSED
;
1602 #ifdef FUNCTION_OUTGOING_VALUE
1604 val
= FUNCTION_OUTGOING_VALUE (valtype
, func
);
1607 val
= FUNCTION_VALUE (valtype
, func
);
1609 if (GET_CODE (val
) == REG
1610 && GET_MODE (val
) == BLKmode
)
1612 unsigned HOST_WIDE_INT bytes
= int_size_in_bytes (valtype
);
1613 enum machine_mode tmpmode
;
1615 for (tmpmode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
1616 tmpmode
!= VOIDmode
;
1617 tmpmode
= GET_MODE_WIDER_MODE (tmpmode
))
1619 /* Have we found a large enough mode? */
1620 if (GET_MODE_SIZE (tmpmode
) >= bytes
)
1624 /* No suitable mode found. */
1625 if (tmpmode
== VOIDmode
)
1628 PUT_MODE (val
, tmpmode
);
1633 /* Return an rtx representing the register or memory location
1634 in which a scalar value of mode MODE was returned by a library call. */
1637 hard_libcall_value (mode
)
1638 enum machine_mode mode
;
1640 return LIBCALL_VALUE (mode
);
1643 /* Look up the tree code for a given rtx code
1644 to provide the arithmetic operation for REAL_ARITHMETIC.
1645 The function returns an int because the caller may not know
1646 what `enum tree_code' means. */
1649 rtx_to_tree_code (code
)
1652 enum tree_code tcode
;
1675 tcode
= LAST_AND_UNUSED_TREE_CODE
;
1678 return ((int) tcode
);