1 /* Emit RTL for the GCC expander.
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* Middle-to-low level generation of rtx code and insns.
23 This file contains support functions for creating rtl expressions
24 and manipulating them in the doubly-linked chain of insns.
26 The patterns of the insns are created by machine-dependent
27 routines in insn-emit.c, which is generated automatically from
28 the machine description. These routines make the individual rtx's
29 of the pattern with `gen_rtx_fmt_ee' and others in genrtl.[ch],
30 which are automatically generated from rtl.def; what is machine
31 dependent is the kind of rtx's they make and what arguments they
36 #include "coretypes.h"
38 #include "diagnostic-core.h"
42 #include "basic-block.h"
47 #include "stringpool.h"
50 #include "hard-reg-set.h"
52 #include "insn-config.h"
56 #include "langhooks.h"
61 struct target_rtl default_target_rtl
;
63 struct target_rtl
*this_target_rtl
= &default_target_rtl
;
66 #define initial_regno_reg_rtx (this_target_rtl->x_initial_regno_reg_rtx)
68 /* Commonly used modes. */
70 enum machine_mode byte_mode
; /* Mode whose width is BITS_PER_UNIT. */
71 enum machine_mode word_mode
; /* Mode whose width is BITS_PER_WORD. */
72 enum machine_mode double_mode
; /* Mode whose width is DOUBLE_TYPE_SIZE. */
73 enum machine_mode ptr_mode
; /* Mode whose width is POINTER_SIZE. */
75 /* Datastructures maintained for currently processed function in RTL form. */
77 struct rtl_data x_rtl
;
79 /* Indexed by pseudo register number, gives the rtx for that pseudo.
80 Allocated in parallel with regno_pointer_align.
81 FIXME: We could put it into emit_status struct, but gengtype is not able to deal
82 with length attribute nested in top level structures. */
86 /* This is *not* reset after each function. It gives each CODE_LABEL
87 in the entire compilation a unique label number. */
89 static GTY(()) int label_num
= 1;
91 /* We record floating-point CONST_DOUBLEs in each floating-point mode for
92 the values of 0, 1, and 2. For the integer entries and VOIDmode, we
93 record a copy of const[012]_rtx and constm1_rtx. CONSTM1_RTX
94 is set only for MODE_INT and MODE_VECTOR_INT modes. */
96 rtx const_tiny_rtx
[4][(int) MAX_MACHINE_MODE
];
100 REAL_VALUE_TYPE dconst0
;
101 REAL_VALUE_TYPE dconst1
;
102 REAL_VALUE_TYPE dconst2
;
103 REAL_VALUE_TYPE dconstm1
;
104 REAL_VALUE_TYPE dconsthalf
;
106 /* Record fixed-point constant 0 and 1. */
107 FIXED_VALUE_TYPE fconst0
[MAX_FCONST0
];
108 FIXED_VALUE_TYPE fconst1
[MAX_FCONST1
];
110 /* We make one copy of (const_int C) where C is in
111 [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT]
112 to save space during the compilation and simplify comparisons of
115 rtx const_int_rtx
[MAX_SAVED_CONST_INT
* 2 + 1];
117 /* Standard pieces of rtx, to be substituted directly into things. */
120 rtx simple_return_rtx
;
123 /* A hash table storing CONST_INTs whose absolute value is greater
124 than MAX_SAVED_CONST_INT. */
126 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
127 htab_t const_int_htab
;
129 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
130 htab_t const_wide_int_htab
;
132 /* A hash table storing register attribute structures. */
133 static GTY ((if_marked ("ggc_marked_p"), param_is (struct reg_attrs
)))
134 htab_t reg_attrs_htab
;
136 /* A hash table storing all CONST_DOUBLEs. */
137 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
138 htab_t const_double_htab
;
140 /* A hash table storing all CONST_FIXEDs. */
141 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
142 htab_t const_fixed_htab
;
144 #define cur_insn_uid (crtl->emit.x_cur_insn_uid)
145 #define cur_debug_insn_uid (crtl->emit.x_cur_debug_insn_uid)
146 #define first_label_num (crtl->emit.x_first_label_num)
148 static void set_used_decls (tree
);
149 static void mark_label_nuses (rtx
);
150 static hashval_t
const_int_htab_hash (const void *);
151 static int const_int_htab_eq (const void *, const void *);
152 #if TARGET_SUPPORTS_WIDE_INT
153 static hashval_t
const_wide_int_htab_hash (const void *);
154 static int const_wide_int_htab_eq (const void *, const void *);
155 static rtx
lookup_const_wide_int (rtx
);
157 static hashval_t
const_double_htab_hash (const void *);
158 static int const_double_htab_eq (const void *, const void *);
159 static rtx
lookup_const_double (rtx
);
160 static hashval_t
const_fixed_htab_hash (const void *);
161 static int const_fixed_htab_eq (const void *, const void *);
162 static rtx
lookup_const_fixed (rtx
);
163 static hashval_t
reg_attrs_htab_hash (const void *);
164 static int reg_attrs_htab_eq (const void *, const void *);
165 static reg_attrs
*get_reg_attrs (tree
, int);
166 static rtx
gen_const_vector (enum machine_mode
, int);
167 static void copy_rtx_if_shared_1 (rtx
*orig
);
169 /* Probability of the conditional branch currently proceeded by try_split.
170 Set to -1 otherwise. */
171 int split_branch_probability
= -1;
173 /* Returns a hash code for X (which is a really a CONST_INT). */
176 const_int_htab_hash (const void *x
)
178 return (hashval_t
) INTVAL ((const_rtx
) x
);
181 /* Returns nonzero if the value represented by X (which is really a
182 CONST_INT) is the same as that given by Y (which is really a
186 const_int_htab_eq (const void *x
, const void *y
)
188 return (INTVAL ((const_rtx
) x
) == *((const HOST_WIDE_INT
*) y
));
191 #if TARGET_SUPPORTS_WIDE_INT
192 /* Returns a hash code for X (which is a really a CONST_WIDE_INT). */
195 const_wide_int_htab_hash (const void *x
)
198 HOST_WIDE_INT hash
= 0;
199 const_rtx xr
= (const_rtx
) x
;
201 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (xr
); i
++)
202 hash
+= CONST_WIDE_INT_ELT (xr
, i
);
204 return (hashval_t
) hash
;
207 /* Returns nonzero if the value represented by X (which is really a
208 CONST_WIDE_INT) is the same as that given by Y (which is really a
212 const_wide_int_htab_eq (const void *x
, const void *y
)
215 const_rtx xr
= (const_rtx
) x
;
216 const_rtx yr
= (const_rtx
) y
;
217 if (CONST_WIDE_INT_NUNITS (xr
) != CONST_WIDE_INT_NUNITS (yr
))
220 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (xr
); i
++)
221 if (CONST_WIDE_INT_ELT (xr
, i
) != CONST_WIDE_INT_ELT (yr
, i
))
228 /* Returns a hash code for X (which is really a CONST_DOUBLE). */
230 const_double_htab_hash (const void *x
)
232 const_rtx
const value
= (const_rtx
) x
;
235 if (TARGET_SUPPORTS_WIDE_INT
== 0 && GET_MODE (value
) == VOIDmode
)
236 h
= CONST_DOUBLE_LOW (value
) ^ CONST_DOUBLE_HIGH (value
);
239 h
= real_hash (CONST_DOUBLE_REAL_VALUE (value
));
240 /* MODE is used in the comparison, so it should be in the hash. */
241 h
^= GET_MODE (value
);
246 /* Returns nonzero if the value represented by X (really a ...)
247 is the same as that represented by Y (really a ...) */
249 const_double_htab_eq (const void *x
, const void *y
)
251 const_rtx
const a
= (const_rtx
)x
, b
= (const_rtx
)y
;
253 if (GET_MODE (a
) != GET_MODE (b
))
255 if (TARGET_SUPPORTS_WIDE_INT
== 0 && GET_MODE (a
) == VOIDmode
)
256 return (CONST_DOUBLE_LOW (a
) == CONST_DOUBLE_LOW (b
)
257 && CONST_DOUBLE_HIGH (a
) == CONST_DOUBLE_HIGH (b
));
259 return real_identical (CONST_DOUBLE_REAL_VALUE (a
),
260 CONST_DOUBLE_REAL_VALUE (b
));
263 /* Returns a hash code for X (which is really a CONST_FIXED). */
266 const_fixed_htab_hash (const void *x
)
268 const_rtx
const value
= (const_rtx
) x
;
271 h
= fixed_hash (CONST_FIXED_VALUE (value
));
272 /* MODE is used in the comparison, so it should be in the hash. */
273 h
^= GET_MODE (value
);
277 /* Returns nonzero if the value represented by X (really a ...)
278 is the same as that represented by Y (really a ...). */
281 const_fixed_htab_eq (const void *x
, const void *y
)
283 const_rtx
const a
= (const_rtx
) x
, b
= (const_rtx
) y
;
285 if (GET_MODE (a
) != GET_MODE (b
))
287 return fixed_identical (CONST_FIXED_VALUE (a
), CONST_FIXED_VALUE (b
));
290 /* Return true if the given memory attributes are equal. */
293 mem_attrs_eq_p (const struct mem_attrs
*p
, const struct mem_attrs
*q
)
295 return (p
->alias
== q
->alias
296 && p
->offset_known_p
== q
->offset_known_p
297 && (!p
->offset_known_p
|| p
->offset
== q
->offset
)
298 && p
->size_known_p
== q
->size_known_p
299 && (!p
->size_known_p
|| p
->size
== q
->size
)
300 && p
->align
== q
->align
301 && p
->addrspace
== q
->addrspace
302 && (p
->expr
== q
->expr
303 || (p
->expr
!= NULL_TREE
&& q
->expr
!= NULL_TREE
304 && operand_equal_p (p
->expr
, q
->expr
, 0))));
307 /* Set MEM's memory attributes so that they are the same as ATTRS. */
310 set_mem_attrs (rtx mem
, mem_attrs
*attrs
)
312 /* If everything is the default, we can just clear the attributes. */
313 if (mem_attrs_eq_p (attrs
, mode_mem_attrs
[(int) GET_MODE (mem
)]))
320 || !mem_attrs_eq_p (attrs
, MEM_ATTRS (mem
)))
322 MEM_ATTRS (mem
) = ggc_alloc_mem_attrs ();
323 memcpy (MEM_ATTRS (mem
), attrs
, sizeof (mem_attrs
));
327 /* Returns a hash code for X (which is a really a reg_attrs *). */
330 reg_attrs_htab_hash (const void *x
)
332 const reg_attrs
*const p
= (const reg_attrs
*) x
;
334 return ((p
->offset
* 1000) ^ (intptr_t) p
->decl
);
337 /* Returns nonzero if the value represented by X (which is really a
338 reg_attrs *) is the same as that given by Y (which is also really a
342 reg_attrs_htab_eq (const void *x
, const void *y
)
344 const reg_attrs
*const p
= (const reg_attrs
*) x
;
345 const reg_attrs
*const q
= (const reg_attrs
*) y
;
347 return (p
->decl
== q
->decl
&& p
->offset
== q
->offset
);
349 /* Allocate a new reg_attrs structure and insert it into the hash table if
350 one identical to it is not already in the table. We are doing this for
354 get_reg_attrs (tree decl
, int offset
)
359 /* If everything is the default, we can just return zero. */
360 if (decl
== 0 && offset
== 0)
364 attrs
.offset
= offset
;
366 slot
= htab_find_slot (reg_attrs_htab
, &attrs
, INSERT
);
369 *slot
= ggc_alloc_reg_attrs ();
370 memcpy (*slot
, &attrs
, sizeof (reg_attrs
));
373 return (reg_attrs
*) *slot
;
378 /* Generate an empty ASM_INPUT, which is used to block attempts to schedule,
379 and to block register equivalences to be seen across this insn. */
384 rtx x
= gen_rtx_ASM_INPUT (VOIDmode
, "");
385 MEM_VOLATILE_P (x
) = true;
391 /* Generate a new REG rtx. Make sure ORIGINAL_REGNO is set properly, and
392 don't attempt to share with the various global pieces of rtl (such as
393 frame_pointer_rtx). */
396 gen_raw_REG (enum machine_mode mode
, int regno
)
398 rtx x
= gen_rtx_raw_REG (mode
, regno
);
399 ORIGINAL_REGNO (x
) = regno
;
403 /* There are some RTL codes that require special attention; the generation
404 functions do the raw handling. If you add to this list, modify
405 special_rtx in gengenrtl.c as well. */
408 gen_rtx_CONST_INT (enum machine_mode mode ATTRIBUTE_UNUSED
, HOST_WIDE_INT arg
)
412 if (arg
>= - MAX_SAVED_CONST_INT
&& arg
<= MAX_SAVED_CONST_INT
)
413 return const_int_rtx
[arg
+ MAX_SAVED_CONST_INT
];
415 #if STORE_FLAG_VALUE != 1 && STORE_FLAG_VALUE != -1
416 if (const_true_rtx
&& arg
== STORE_FLAG_VALUE
)
417 return const_true_rtx
;
420 /* Look up the CONST_INT in the hash table. */
421 slot
= htab_find_slot_with_hash (const_int_htab
, &arg
,
422 (hashval_t
) arg
, INSERT
);
424 *slot
= gen_rtx_raw_CONST_INT (VOIDmode
, arg
);
430 gen_int_mode (HOST_WIDE_INT c
, enum machine_mode mode
)
432 return GEN_INT (trunc_int_for_mode (c
, mode
));
435 /* CONST_DOUBLEs might be created from pairs of integers, or from
436 REAL_VALUE_TYPEs. Also, their length is known only at run time,
437 so we cannot use gen_rtx_raw_CONST_DOUBLE. */
439 /* Determine whether REAL, a CONST_DOUBLE, already exists in the
440 hash table. If so, return its counterpart; otherwise add it
441 to the hash table and return it. */
443 lookup_const_double (rtx real
)
445 void **slot
= htab_find_slot (const_double_htab
, real
, INSERT
);
452 /* Return a CONST_DOUBLE rtx for a floating-point value specified by
453 VALUE in mode MODE. */
455 const_double_from_real_value (REAL_VALUE_TYPE value
, enum machine_mode mode
)
457 rtx real
= rtx_alloc (CONST_DOUBLE
);
458 PUT_MODE (real
, mode
);
462 return lookup_const_double (real
);
465 /* Determine whether FIXED, a CONST_FIXED, already exists in the
466 hash table. If so, return its counterpart; otherwise add it
467 to the hash table and return it. */
470 lookup_const_fixed (rtx fixed
)
472 void **slot
= htab_find_slot (const_fixed_htab
, fixed
, INSERT
);
479 /* Return a CONST_FIXED rtx for a fixed-point value specified by
480 VALUE in mode MODE. */
483 const_fixed_from_fixed_value (FIXED_VALUE_TYPE value
, enum machine_mode mode
)
485 rtx fixed
= rtx_alloc (CONST_FIXED
);
486 PUT_MODE (fixed
, mode
);
490 return lookup_const_fixed (fixed
);
493 #if TARGET_SUPPORTS_WIDE_INT == 0
494 /* Constructs double_int from rtx CST. */
497 rtx_to_double_int (const_rtx cst
)
501 if (CONST_INT_P (cst
))
502 r
= double_int::from_shwi (INTVAL (cst
));
503 else if (CONST_DOUBLE_AS_INT_P (cst
))
505 r
.low
= CONST_DOUBLE_LOW (cst
);
506 r
.high
= CONST_DOUBLE_HIGH (cst
);
515 #if TARGET_SUPPORTS_WIDE_INT
516 /* Determine whether CONST_WIDE_INT WINT already exists in the hash table.
517 If so, return its counterpart; otherwise add it to the hash table and
521 lookup_const_wide_int (rtx wint
)
523 void **slot
= htab_find_slot (const_wide_int_htab
, wint
, INSERT
);
531 /* Return an rtx constant for V, given that the constant has mode MODE.
532 The returned rtx will be a CONST_INT if V fits, otherwise it will be
533 a CONST_DOUBLE (if !TARGET_SUPPORTS_WIDE_INT) or a CONST_WIDE_INT
534 (if TARGET_SUPPORTS_WIDE_INT). */
537 immed_wide_int_const (const wide_int_ref
&v
, enum machine_mode mode
)
539 unsigned int len
= v
.get_len ();
540 unsigned int prec
= GET_MODE_PRECISION (mode
);
542 /* Allow truncation but not extension since we do not know if the
543 number is signed or unsigned. */
544 gcc_assert (prec
<= v
.get_precision ());
546 if (len
< 2 || prec
<= HOST_BITS_PER_WIDE_INT
)
547 return gen_int_mode (v
.elt (0), mode
);
549 #if TARGET_SUPPORTS_WIDE_INT
553 unsigned int blocks_needed
554 = (prec
+ HOST_BITS_PER_WIDE_INT
- 1) / HOST_BITS_PER_WIDE_INT
;
556 if (len
> blocks_needed
)
559 value
= const_wide_int_alloc (len
);
561 /* It is so tempting to just put the mode in here. Must control
563 PUT_MODE (value
, VOIDmode
);
564 CWI_PUT_NUM_ELEM (value
, len
);
566 for (i
= 0; i
< len
; i
++)
567 CONST_WIDE_INT_ELT (value
, i
) = v
.elt (i
);
569 return lookup_const_wide_int (value
);
572 return immed_double_const (v
.elt (0), v
.elt (1), mode
);
576 #if TARGET_SUPPORTS_WIDE_INT == 0
577 /* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair
578 of ints: I0 is the low-order word and I1 is the high-order word.
579 For values that are larger than HOST_BITS_PER_DOUBLE_INT, the
580 implied upper bits are copies of the high bit of i1. The value
581 itself is neither signed nor unsigned. Do not use this routine for
582 non-integer modes; convert to REAL_VALUE_TYPE and use
583 CONST_DOUBLE_FROM_REAL_VALUE. */
586 immed_double_const (HOST_WIDE_INT i0
, HOST_WIDE_INT i1
, enum machine_mode mode
)
591 /* There are the following cases (note that there are no modes with
592 HOST_BITS_PER_WIDE_INT < GET_MODE_BITSIZE (mode) < HOST_BITS_PER_DOUBLE_INT):
594 1) If GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT, then we use
596 2) If the value of the integer fits into HOST_WIDE_INT anyway
597 (i.e., i1 consists only from copies of the sign bit, and sign
598 of i0 and i1 are the same), then we return a CONST_INT for i0.
599 3) Otherwise, we create a CONST_DOUBLE for i0 and i1. */
600 if (mode
!= VOIDmode
)
602 gcc_assert (GET_MODE_CLASS (mode
) == MODE_INT
603 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
604 /* We can get a 0 for an error mark. */
605 || GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
606 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
);
608 if (GET_MODE_BITSIZE (mode
) <= HOST_BITS_PER_WIDE_INT
)
609 return gen_int_mode (i0
, mode
);
612 /* If this integer fits in one word, return a CONST_INT. */
613 if ((i1
== 0 && i0
>= 0) || (i1
== ~0 && i0
< 0))
616 /* We use VOIDmode for integers. */
617 value
= rtx_alloc (CONST_DOUBLE
);
618 PUT_MODE (value
, VOIDmode
);
620 CONST_DOUBLE_LOW (value
) = i0
;
621 CONST_DOUBLE_HIGH (value
) = i1
;
623 for (i
= 2; i
< (sizeof CONST_DOUBLE_FORMAT
- 1); i
++)
624 XWINT (value
, i
) = 0;
626 return lookup_const_double (value
);
631 gen_rtx_REG (enum machine_mode mode
, unsigned int regno
)
633 /* In case the MD file explicitly references the frame pointer, have
634 all such references point to the same frame pointer. This is
635 used during frame pointer elimination to distinguish the explicit
636 references to these registers from pseudos that happened to be
639 If we have eliminated the frame pointer or arg pointer, we will
640 be using it as a normal register, for example as a spill
641 register. In such cases, we might be accessing it in a mode that
642 is not Pmode and therefore cannot use the pre-allocated rtx.
644 Also don't do this when we are making new REGs in reload, since
645 we don't want to get confused with the real pointers. */
647 if (mode
== Pmode
&& !reload_in_progress
&& !lra_in_progress
)
649 if (regno
== FRAME_POINTER_REGNUM
650 && (!reload_completed
|| frame_pointer_needed
))
651 return frame_pointer_rtx
;
652 #if !HARD_FRAME_POINTER_IS_FRAME_POINTER
653 if (regno
== HARD_FRAME_POINTER_REGNUM
654 && (!reload_completed
|| frame_pointer_needed
))
655 return hard_frame_pointer_rtx
;
657 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM && !HARD_FRAME_POINTER_IS_ARG_POINTER
658 if (regno
== ARG_POINTER_REGNUM
)
659 return arg_pointer_rtx
;
661 #ifdef RETURN_ADDRESS_POINTER_REGNUM
662 if (regno
== RETURN_ADDRESS_POINTER_REGNUM
)
663 return return_address_pointer_rtx
;
665 if (regno
== (unsigned) PIC_OFFSET_TABLE_REGNUM
666 && PIC_OFFSET_TABLE_REGNUM
!= INVALID_REGNUM
667 && fixed_regs
[PIC_OFFSET_TABLE_REGNUM
])
668 return pic_offset_table_rtx
;
669 if (regno
== STACK_POINTER_REGNUM
)
670 return stack_pointer_rtx
;
674 /* If the per-function register table has been set up, try to re-use
675 an existing entry in that table to avoid useless generation of RTL.
677 This code is disabled for now until we can fix the various backends
678 which depend on having non-shared hard registers in some cases. Long
679 term we want to re-enable this code as it can significantly cut down
680 on the amount of useless RTL that gets generated.
682 We'll also need to fix some code that runs after reload that wants to
683 set ORIGINAL_REGNO. */
688 && regno
< FIRST_PSEUDO_REGISTER
689 && reg_raw_mode
[regno
] == mode
)
690 return regno_reg_rtx
[regno
];
693 return gen_raw_REG (mode
, regno
);
697 gen_rtx_MEM (enum machine_mode mode
, rtx addr
)
699 rtx rt
= gen_rtx_raw_MEM (mode
, addr
);
701 /* This field is not cleared by the mere allocation of the rtx, so
708 /* Generate a memory referring to non-trapping constant memory. */
711 gen_const_mem (enum machine_mode mode
, rtx addr
)
713 rtx mem
= gen_rtx_MEM (mode
, addr
);
714 MEM_READONLY_P (mem
) = 1;
715 MEM_NOTRAP_P (mem
) = 1;
719 /* Generate a MEM referring to fixed portions of the frame, e.g., register
723 gen_frame_mem (enum machine_mode mode
, rtx addr
)
725 rtx mem
= gen_rtx_MEM (mode
, addr
);
726 MEM_NOTRAP_P (mem
) = 1;
727 set_mem_alias_set (mem
, get_frame_alias_set ());
731 /* Generate a MEM referring to a temporary use of the stack, not part
732 of the fixed stack frame. For example, something which is pushed
733 by a target splitter. */
735 gen_tmp_stack_mem (enum machine_mode mode
, rtx addr
)
737 rtx mem
= gen_rtx_MEM (mode
, addr
);
738 MEM_NOTRAP_P (mem
) = 1;
739 if (!cfun
->calls_alloca
)
740 set_mem_alias_set (mem
, get_frame_alias_set ());
744 /* We want to create (subreg:OMODE (obj:IMODE) OFFSET). Return true if
745 this construct would be valid, and false otherwise. */
748 validate_subreg (enum machine_mode omode
, enum machine_mode imode
,
749 const_rtx reg
, unsigned int offset
)
751 unsigned int isize
= GET_MODE_SIZE (imode
);
752 unsigned int osize
= GET_MODE_SIZE (omode
);
754 /* All subregs must be aligned. */
755 if (offset
% osize
!= 0)
758 /* The subreg offset cannot be outside the inner object. */
762 /* ??? This should not be here. Temporarily continue to allow word_mode
763 subregs of anything. The most common offender is (subreg:SI (reg:DF)).
764 Generally, backends are doing something sketchy but it'll take time to
766 if (omode
== word_mode
)
768 /* ??? Similarly, e.g. with (subreg:DF (reg:TI)). Though store_bit_field
769 is the culprit here, and not the backends. */
770 else if (osize
>= UNITS_PER_WORD
&& isize
>= osize
)
772 /* Allow component subregs of complex and vector. Though given the below
773 extraction rules, it's not always clear what that means. */
774 else if ((COMPLEX_MODE_P (imode
) || VECTOR_MODE_P (imode
))
775 && GET_MODE_INNER (imode
) == omode
)
777 /* ??? x86 sse code makes heavy use of *paradoxical* vector subregs,
778 i.e. (subreg:V4SF (reg:SF) 0). This surely isn't the cleanest way to
779 represent this. It's questionable if this ought to be represented at
780 all -- why can't this all be hidden in post-reload splitters that make
781 arbitrarily mode changes to the registers themselves. */
782 else if (VECTOR_MODE_P (omode
) && GET_MODE_INNER (omode
) == imode
)
784 /* Subregs involving floating point modes are not allowed to
785 change size. Therefore (subreg:DI (reg:DF) 0) is fine, but
786 (subreg:SI (reg:DF) 0) isn't. */
787 else if (FLOAT_MODE_P (imode
) || FLOAT_MODE_P (omode
))
789 if (! (isize
== osize
790 /* LRA can use subreg to store a floating point value in
791 an integer mode. Although the floating point and the
792 integer modes need the same number of hard registers,
793 the size of floating point mode can be less than the
794 integer mode. LRA also uses subregs for a register
795 should be used in different mode in on insn. */
800 /* Paradoxical subregs must have offset zero. */
804 /* This is a normal subreg. Verify that the offset is representable. */
806 /* For hard registers, we already have most of these rules collected in
807 subreg_offset_representable_p. */
808 if (reg
&& REG_P (reg
) && HARD_REGISTER_P (reg
))
810 unsigned int regno
= REGNO (reg
);
812 #ifdef CANNOT_CHANGE_MODE_CLASS
813 if ((COMPLEX_MODE_P (imode
) || VECTOR_MODE_P (imode
))
814 && GET_MODE_INNER (imode
) == omode
)
816 else if (REG_CANNOT_CHANGE_MODE_P (regno
, imode
, omode
))
820 return subreg_offset_representable_p (regno
, imode
, offset
, omode
);
823 /* For pseudo registers, we want most of the same checks. Namely:
824 If the register no larger than a word, the subreg must be lowpart.
825 If the register is larger than a word, the subreg must be the lowpart
826 of a subword. A subreg does *not* perform arbitrary bit extraction.
827 Given that we've already checked mode/offset alignment, we only have
828 to check subword subregs here. */
829 if (osize
< UNITS_PER_WORD
830 && ! (lra_in_progress
&& (FLOAT_MODE_P (imode
) || FLOAT_MODE_P (omode
))))
832 enum machine_mode wmode
= isize
> UNITS_PER_WORD
? word_mode
: imode
;
833 unsigned int low_off
= subreg_lowpart_offset (omode
, wmode
);
834 if (offset
% UNITS_PER_WORD
!= low_off
)
841 gen_rtx_SUBREG (enum machine_mode mode
, rtx reg
, int offset
)
843 gcc_assert (validate_subreg (mode
, GET_MODE (reg
), reg
, offset
));
844 return gen_rtx_raw_SUBREG (mode
, reg
, offset
);
847 /* Generate a SUBREG representing the least-significant part of REG if MODE
848 is smaller than mode of REG, otherwise paradoxical SUBREG. */
851 gen_lowpart_SUBREG (enum machine_mode mode
, rtx reg
)
853 enum machine_mode inmode
;
855 inmode
= GET_MODE (reg
);
856 if (inmode
== VOIDmode
)
858 return gen_rtx_SUBREG (mode
, reg
,
859 subreg_lowpart_offset (mode
, inmode
));
863 gen_rtx_VAR_LOCATION (enum machine_mode mode
, tree decl
, rtx loc
,
864 enum var_init_status status
)
866 rtx x
= gen_rtx_fmt_te (VAR_LOCATION
, mode
, decl
, loc
);
867 PAT_VAR_LOCATION_STATUS (x
) = status
;
872 /* Create an rtvec and stores within it the RTXen passed in the arguments. */
875 gen_rtvec (int n
, ...)
883 /* Don't allocate an empty rtvec... */
890 rt_val
= rtvec_alloc (n
);
892 for (i
= 0; i
< n
; i
++)
893 rt_val
->elem
[i
] = va_arg (p
, rtx
);
900 gen_rtvec_v (int n
, rtx
*argp
)
905 /* Don't allocate an empty rtvec... */
909 rt_val
= rtvec_alloc (n
);
911 for (i
= 0; i
< n
; i
++)
912 rt_val
->elem
[i
] = *argp
++;
917 /* Return the number of bytes between the start of an OUTER_MODE
918 in-memory value and the start of an INNER_MODE in-memory value,
919 given that the former is a lowpart of the latter. It may be a
920 paradoxical lowpart, in which case the offset will be negative
921 on big-endian targets. */
924 byte_lowpart_offset (enum machine_mode outer_mode
,
925 enum machine_mode inner_mode
)
927 if (GET_MODE_SIZE (outer_mode
) < GET_MODE_SIZE (inner_mode
))
928 return subreg_lowpart_offset (outer_mode
, inner_mode
);
930 return -subreg_lowpart_offset (inner_mode
, outer_mode
);
933 /* Generate a REG rtx for a new pseudo register of mode MODE.
934 This pseudo is assigned the next sequential register number. */
937 gen_reg_rtx (enum machine_mode mode
)
940 unsigned int align
= GET_MODE_ALIGNMENT (mode
);
942 gcc_assert (can_create_pseudo_p ());
944 /* If a virtual register with bigger mode alignment is generated,
945 increase stack alignment estimation because it might be spilled
947 if (SUPPORTS_STACK_ALIGNMENT
948 && crtl
->stack_alignment_estimated
< align
949 && !crtl
->stack_realign_processed
)
951 unsigned int min_align
= MINIMUM_ALIGNMENT (NULL
, mode
, align
);
952 if (crtl
->stack_alignment_estimated
< min_align
)
953 crtl
->stack_alignment_estimated
= min_align
;
956 if (generating_concat_p
957 && (GET_MODE_CLASS (mode
) == MODE_COMPLEX_FLOAT
958 || GET_MODE_CLASS (mode
) == MODE_COMPLEX_INT
))
960 /* For complex modes, don't make a single pseudo.
961 Instead, make a CONCAT of two pseudos.
962 This allows noncontiguous allocation of the real and imaginary parts,
963 which makes much better code. Besides, allocating DCmode
964 pseudos overstrains reload on some machines like the 386. */
965 rtx realpart
, imagpart
;
966 enum machine_mode partmode
= GET_MODE_INNER (mode
);
968 realpart
= gen_reg_rtx (partmode
);
969 imagpart
= gen_reg_rtx (partmode
);
970 return gen_rtx_CONCAT (mode
, realpart
, imagpart
);
973 /* Do not call gen_reg_rtx with uninitialized crtl. */
974 gcc_assert (crtl
->emit
.regno_pointer_align_length
);
976 /* Make sure regno_pointer_align, and regno_reg_rtx are large
977 enough to have an element for this pseudo reg number. */
979 if (reg_rtx_no
== crtl
->emit
.regno_pointer_align_length
)
981 int old_size
= crtl
->emit
.regno_pointer_align_length
;
985 tmp
= XRESIZEVEC (char, crtl
->emit
.regno_pointer_align
, old_size
* 2);
986 memset (tmp
+ old_size
, 0, old_size
);
987 crtl
->emit
.regno_pointer_align
= (unsigned char *) tmp
;
989 new1
= GGC_RESIZEVEC (rtx
, regno_reg_rtx
, old_size
* 2);
990 memset (new1
+ old_size
, 0, old_size
* sizeof (rtx
));
991 regno_reg_rtx
= new1
;
993 crtl
->emit
.regno_pointer_align_length
= old_size
* 2;
996 val
= gen_raw_REG (mode
, reg_rtx_no
);
997 regno_reg_rtx
[reg_rtx_no
++] = val
;
1001 /* Return TRUE if REG is a PARM_DECL, FALSE otherwise. */
1004 reg_is_parm_p (rtx reg
)
1008 gcc_assert (REG_P (reg
));
1009 decl
= REG_EXPR (reg
);
1010 return (decl
&& TREE_CODE (decl
) == PARM_DECL
);
1013 /* Update NEW with the same attributes as REG, but with OFFSET added
1014 to the REG_OFFSET. */
1017 update_reg_offset (rtx new_rtx
, rtx reg
, int offset
)
1019 REG_ATTRS (new_rtx
) = get_reg_attrs (REG_EXPR (reg
),
1020 REG_OFFSET (reg
) + offset
);
1023 /* Generate a register with same attributes as REG, but with OFFSET
1024 added to the REG_OFFSET. */
1027 gen_rtx_REG_offset (rtx reg
, enum machine_mode mode
, unsigned int regno
,
1030 rtx new_rtx
= gen_rtx_REG (mode
, regno
);
1032 update_reg_offset (new_rtx
, reg
, offset
);
1036 /* Generate a new pseudo-register with the same attributes as REG, but
1037 with OFFSET added to the REG_OFFSET. */
1040 gen_reg_rtx_offset (rtx reg
, enum machine_mode mode
, int offset
)
1042 rtx new_rtx
= gen_reg_rtx (mode
);
1044 update_reg_offset (new_rtx
, reg
, offset
);
1048 /* Adjust REG in-place so that it has mode MODE. It is assumed that the
1049 new register is a (possibly paradoxical) lowpart of the old one. */
1052 adjust_reg_mode (rtx reg
, enum machine_mode mode
)
1054 update_reg_offset (reg
, reg
, byte_lowpart_offset (mode
, GET_MODE (reg
)));
1055 PUT_MODE (reg
, mode
);
1058 /* Copy REG's attributes from X, if X has any attributes. If REG and X
1059 have different modes, REG is a (possibly paradoxical) lowpart of X. */
1062 set_reg_attrs_from_value (rtx reg
, rtx x
)
1065 bool can_be_reg_pointer
= true;
1067 /* Don't call mark_reg_pointer for incompatible pointer sign
1069 while (GET_CODE (x
) == SIGN_EXTEND
1070 || GET_CODE (x
) == ZERO_EXTEND
1071 || GET_CODE (x
) == TRUNCATE
1072 || (GET_CODE (x
) == SUBREG
&& subreg_lowpart_p (x
)))
1074 #if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
1075 if ((GET_CODE (x
) == SIGN_EXTEND
&& POINTERS_EXTEND_UNSIGNED
)
1076 || (GET_CODE (x
) != SIGN_EXTEND
&& ! POINTERS_EXTEND_UNSIGNED
))
1077 can_be_reg_pointer
= false;
1082 /* Hard registers can be reused for multiple purposes within the same
1083 function, so setting REG_ATTRS, REG_POINTER and REG_POINTER_ALIGN
1084 on them is wrong. */
1085 if (HARD_REGISTER_P (reg
))
1088 offset
= byte_lowpart_offset (GET_MODE (reg
), GET_MODE (x
));
1091 if (MEM_OFFSET_KNOWN_P (x
))
1092 REG_ATTRS (reg
) = get_reg_attrs (MEM_EXPR (x
),
1093 MEM_OFFSET (x
) + offset
);
1094 if (can_be_reg_pointer
&& MEM_POINTER (x
))
1095 mark_reg_pointer (reg
, 0);
1100 update_reg_offset (reg
, x
, offset
);
1101 if (can_be_reg_pointer
&& REG_POINTER (x
))
1102 mark_reg_pointer (reg
, REGNO_POINTER_ALIGN (REGNO (x
)));
1106 /* Generate a REG rtx for a new pseudo register, copying the mode
1107 and attributes from X. */
1110 gen_reg_rtx_and_attrs (rtx x
)
1112 rtx reg
= gen_reg_rtx (GET_MODE (x
));
1113 set_reg_attrs_from_value (reg
, x
);
1117 /* Set the register attributes for registers contained in PARM_RTX.
1118 Use needed values from memory attributes of MEM. */
1121 set_reg_attrs_for_parm (rtx parm_rtx
, rtx mem
)
1123 if (REG_P (parm_rtx
))
1124 set_reg_attrs_from_value (parm_rtx
, mem
);
1125 else if (GET_CODE (parm_rtx
) == PARALLEL
)
1127 /* Check for a NULL entry in the first slot, used to indicate that the
1128 parameter goes both on the stack and in registers. */
1129 int i
= XEXP (XVECEXP (parm_rtx
, 0, 0), 0) ? 0 : 1;
1130 for (; i
< XVECLEN (parm_rtx
, 0); i
++)
1132 rtx x
= XVECEXP (parm_rtx
, 0, i
);
1133 if (REG_P (XEXP (x
, 0)))
1134 REG_ATTRS (XEXP (x
, 0))
1135 = get_reg_attrs (MEM_EXPR (mem
),
1136 INTVAL (XEXP (x
, 1)));
1141 /* Set the REG_ATTRS for registers in value X, given that X represents
1145 set_reg_attrs_for_decl_rtl (tree t
, rtx x
)
1147 if (GET_CODE (x
) == SUBREG
)
1149 gcc_assert (subreg_lowpart_p (x
));
1154 = get_reg_attrs (t
, byte_lowpart_offset (GET_MODE (x
),
1156 if (GET_CODE (x
) == CONCAT
)
1158 if (REG_P (XEXP (x
, 0)))
1159 REG_ATTRS (XEXP (x
, 0)) = get_reg_attrs (t
, 0);
1160 if (REG_P (XEXP (x
, 1)))
1161 REG_ATTRS (XEXP (x
, 1))
1162 = get_reg_attrs (t
, GET_MODE_UNIT_SIZE (GET_MODE (XEXP (x
, 0))));
1164 if (GET_CODE (x
) == PARALLEL
)
1168 /* Check for a NULL entry, used to indicate that the parameter goes
1169 both on the stack and in registers. */
1170 if (XEXP (XVECEXP (x
, 0, 0), 0))
1175 for (i
= start
; i
< XVECLEN (x
, 0); i
++)
1177 rtx y
= XVECEXP (x
, 0, i
);
1178 if (REG_P (XEXP (y
, 0)))
1179 REG_ATTRS (XEXP (y
, 0)) = get_reg_attrs (t
, INTVAL (XEXP (y
, 1)));
1184 /* Assign the RTX X to declaration T. */
1187 set_decl_rtl (tree t
, rtx x
)
1189 DECL_WRTL_CHECK (t
)->decl_with_rtl
.rtl
= x
;
1191 set_reg_attrs_for_decl_rtl (t
, x
);
1194 /* Assign the RTX X to parameter declaration T. BY_REFERENCE_P is true
1195 if the ABI requires the parameter to be passed by reference. */
1198 set_decl_incoming_rtl (tree t
, rtx x
, bool by_reference_p
)
1200 DECL_INCOMING_RTL (t
) = x
;
1201 if (x
&& !by_reference_p
)
1202 set_reg_attrs_for_decl_rtl (t
, x
);
1205 /* Identify REG (which may be a CONCAT) as a user register. */
1208 mark_user_reg (rtx reg
)
1210 if (GET_CODE (reg
) == CONCAT
)
1212 REG_USERVAR_P (XEXP (reg
, 0)) = 1;
1213 REG_USERVAR_P (XEXP (reg
, 1)) = 1;
1217 gcc_assert (REG_P (reg
));
1218 REG_USERVAR_P (reg
) = 1;
1222 /* Identify REG as a probable pointer register and show its alignment
1223 as ALIGN, if nonzero. */
1226 mark_reg_pointer (rtx reg
, int align
)
1228 if (! REG_POINTER (reg
))
1230 REG_POINTER (reg
) = 1;
1233 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
1235 else if (align
&& align
< REGNO_POINTER_ALIGN (REGNO (reg
)))
1236 /* We can no-longer be sure just how aligned this pointer is. */
1237 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
1240 /* Return 1 plus largest pseudo reg number used in the current function. */
1248 /* Return 1 + the largest label number used so far in the current function. */
1251 max_label_num (void)
1256 /* Return first label number used in this function (if any were used). */
1259 get_first_label_num (void)
1261 return first_label_num
;
1264 /* If the rtx for label was created during the expansion of a nested
1265 function, then first_label_num won't include this label number.
1266 Fix this now so that array indices work later. */
1269 maybe_set_first_label_num (rtx x
)
1271 if (CODE_LABEL_NUMBER (x
) < first_label_num
)
1272 first_label_num
= CODE_LABEL_NUMBER (x
);
1275 /* Return a value representing some low-order bits of X, where the number
1276 of low-order bits is given by MODE. Note that no conversion is done
1277 between floating-point and fixed-point values, rather, the bit
1278 representation is returned.
1280 This function handles the cases in common between gen_lowpart, below,
1281 and two variants in cse.c and combine.c. These are the cases that can
1282 be safely handled at all points in the compilation.
1284 If this is not a case we can handle, return 0. */
1287 gen_lowpart_common (enum machine_mode mode
, rtx x
)
1289 int msize
= GET_MODE_SIZE (mode
);
1292 enum machine_mode innermode
;
1294 /* Unfortunately, this routine doesn't take a parameter for the mode of X,
1295 so we have to make one up. Yuk. */
1296 innermode
= GET_MODE (x
);
1298 && msize
* BITS_PER_UNIT
<= HOST_BITS_PER_WIDE_INT
)
1299 innermode
= mode_for_size (HOST_BITS_PER_WIDE_INT
, MODE_INT
, 0);
1300 else if (innermode
== VOIDmode
)
1301 innermode
= mode_for_size (HOST_BITS_PER_DOUBLE_INT
, MODE_INT
, 0);
1303 xsize
= GET_MODE_SIZE (innermode
);
1305 gcc_assert (innermode
!= VOIDmode
&& innermode
!= BLKmode
);
1307 if (innermode
== mode
)
1310 /* MODE must occupy no more words than the mode of X. */
1311 if ((msize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
1312 > ((xsize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
))
1315 /* Don't allow generating paradoxical FLOAT_MODE subregs. */
1316 if (SCALAR_FLOAT_MODE_P (mode
) && msize
> xsize
)
1319 offset
= subreg_lowpart_offset (mode
, innermode
);
1321 if ((GET_CODE (x
) == ZERO_EXTEND
|| GET_CODE (x
) == SIGN_EXTEND
)
1322 && (GET_MODE_CLASS (mode
) == MODE_INT
1323 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
))
1325 /* If we are getting the low-order part of something that has been
1326 sign- or zero-extended, we can either just use the object being
1327 extended or make a narrower extension. If we want an even smaller
1328 piece than the size of the object being extended, call ourselves
1331 This case is used mostly by combine and cse. */
1333 if (GET_MODE (XEXP (x
, 0)) == mode
)
1335 else if (msize
< GET_MODE_SIZE (GET_MODE (XEXP (x
, 0))))
1336 return gen_lowpart_common (mode
, XEXP (x
, 0));
1337 else if (msize
< xsize
)
1338 return gen_rtx_fmt_e (GET_CODE (x
), mode
, XEXP (x
, 0));
1340 else if (GET_CODE (x
) == SUBREG
|| REG_P (x
)
1341 || GET_CODE (x
) == CONCAT
|| GET_CODE (x
) == CONST_VECTOR
1342 || CONST_DOUBLE_AS_FLOAT_P (x
) || CONST_SCALAR_INT_P (x
))
1343 return simplify_gen_subreg (mode
, x
, innermode
, offset
);
1345 /* Otherwise, we can't do this. */
1350 gen_highpart (enum machine_mode mode
, rtx x
)
1352 unsigned int msize
= GET_MODE_SIZE (mode
);
1355 /* This case loses if X is a subreg. To catch bugs early,
1356 complain if an invalid MODE is used even in other cases. */
1357 gcc_assert (msize
<= UNITS_PER_WORD
1358 || msize
== (unsigned int) GET_MODE_UNIT_SIZE (GET_MODE (x
)));
1360 result
= simplify_gen_subreg (mode
, x
, GET_MODE (x
),
1361 subreg_highpart_offset (mode
, GET_MODE (x
)));
1362 gcc_assert (result
);
1364 /* simplify_gen_subreg is not guaranteed to return a valid operand for
1365 the target if we have a MEM. gen_highpart must return a valid operand,
1366 emitting code if necessary to do so. */
1369 result
= validize_mem (result
);
1370 gcc_assert (result
);
1376 /* Like gen_highpart, but accept mode of EXP operand in case EXP can
1377 be VOIDmode constant. */
1379 gen_highpart_mode (enum machine_mode outermode
, enum machine_mode innermode
, rtx exp
)
1381 if (GET_MODE (exp
) != VOIDmode
)
1383 gcc_assert (GET_MODE (exp
) == innermode
);
1384 return gen_highpart (outermode
, exp
);
1386 return simplify_gen_subreg (outermode
, exp
, innermode
,
1387 subreg_highpart_offset (outermode
, innermode
));
1390 /* Return the SUBREG_BYTE for an OUTERMODE lowpart of an INNERMODE value. */
1393 subreg_lowpart_offset (enum machine_mode outermode
, enum machine_mode innermode
)
1395 unsigned int offset
= 0;
1396 int difference
= (GET_MODE_SIZE (innermode
) - GET_MODE_SIZE (outermode
));
1400 if (WORDS_BIG_ENDIAN
)
1401 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
1402 if (BYTES_BIG_ENDIAN
)
1403 offset
+= difference
% UNITS_PER_WORD
;
1409 /* Return offset in bytes to get OUTERMODE high part
1410 of the value in mode INNERMODE stored in memory in target format. */
1412 subreg_highpart_offset (enum machine_mode outermode
, enum machine_mode innermode
)
1414 unsigned int offset
= 0;
1415 int difference
= (GET_MODE_SIZE (innermode
) - GET_MODE_SIZE (outermode
));
1417 gcc_assert (GET_MODE_SIZE (innermode
) >= GET_MODE_SIZE (outermode
));
1421 if (! WORDS_BIG_ENDIAN
)
1422 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
1423 if (! BYTES_BIG_ENDIAN
)
1424 offset
+= difference
% UNITS_PER_WORD
;
1430 /* Return 1 iff X, assumed to be a SUBREG,
1431 refers to the least significant part of its containing reg.
1432 If X is not a SUBREG, always return 1 (it is its own low part!). */
1435 subreg_lowpart_p (const_rtx x
)
1437 if (GET_CODE (x
) != SUBREG
)
1439 else if (GET_MODE (SUBREG_REG (x
)) == VOIDmode
)
1442 return (subreg_lowpart_offset (GET_MODE (x
), GET_MODE (SUBREG_REG (x
)))
1443 == SUBREG_BYTE (x
));
1446 /* Return true if X is a paradoxical subreg, false otherwise. */
1448 paradoxical_subreg_p (const_rtx x
)
1450 if (GET_CODE (x
) != SUBREG
)
1452 return (GET_MODE_PRECISION (GET_MODE (x
))
1453 > GET_MODE_PRECISION (GET_MODE (SUBREG_REG (x
))));
1456 /* Return subword OFFSET of operand OP.
1457 The word number, OFFSET, is interpreted as the word number starting
1458 at the low-order address. OFFSET 0 is the low-order word if not
1459 WORDS_BIG_ENDIAN, otherwise it is the high-order word.
1461 If we cannot extract the required word, we return zero. Otherwise,
1462 an rtx corresponding to the requested word will be returned.
1464 VALIDATE_ADDRESS is nonzero if the address should be validated. Before
1465 reload has completed, a valid address will always be returned. After
1466 reload, if a valid address cannot be returned, we return zero.
1468 If VALIDATE_ADDRESS is zero, we simply form the required address; validating
1469 it is the responsibility of the caller.
1471 MODE is the mode of OP in case it is a CONST_INT.
1473 ??? This is still rather broken for some cases. The problem for the
1474 moment is that all callers of this thing provide no 'goal mode' to
1475 tell us to work with. This exists because all callers were written
1476 in a word based SUBREG world.
1477 Now use of this function can be deprecated by simplify_subreg in most
1482 operand_subword (rtx op
, unsigned int offset
, int validate_address
, enum machine_mode mode
)
1484 if (mode
== VOIDmode
)
1485 mode
= GET_MODE (op
);
1487 gcc_assert (mode
!= VOIDmode
);
1489 /* If OP is narrower than a word, fail. */
1491 && (GET_MODE_SIZE (mode
) < UNITS_PER_WORD
))
1494 /* If we want a word outside OP, return zero. */
1496 && (offset
+ 1) * UNITS_PER_WORD
> GET_MODE_SIZE (mode
))
1499 /* Form a new MEM at the requested address. */
1502 rtx new_rtx
= adjust_address_nv (op
, word_mode
, offset
* UNITS_PER_WORD
);
1504 if (! validate_address
)
1507 else if (reload_completed
)
1509 if (! strict_memory_address_addr_space_p (word_mode
,
1511 MEM_ADDR_SPACE (op
)))
1515 return replace_equiv_address (new_rtx
, XEXP (new_rtx
, 0));
1518 /* Rest can be handled by simplify_subreg. */
1519 return simplify_gen_subreg (word_mode
, op
, mode
, (offset
* UNITS_PER_WORD
));
1522 /* Similar to `operand_subword', but never return 0. If we can't
1523 extract the required subword, put OP into a register and try again.
1524 The second attempt must succeed. We always validate the address in
1527 MODE is the mode of OP, in case it is CONST_INT. */
1530 operand_subword_force (rtx op
, unsigned int offset
, enum machine_mode mode
)
1532 rtx result
= operand_subword (op
, offset
, 1, mode
);
1537 if (mode
!= BLKmode
&& mode
!= VOIDmode
)
1539 /* If this is a register which can not be accessed by words, copy it
1540 to a pseudo register. */
1542 op
= copy_to_reg (op
);
1544 op
= force_reg (mode
, op
);
1547 result
= operand_subword (op
, offset
, 1, mode
);
1548 gcc_assert (result
);
1553 /* Returns 1 if both MEM_EXPR can be considered equal
1557 mem_expr_equal_p (const_tree expr1
, const_tree expr2
)
1562 if (! expr1
|| ! expr2
)
1565 if (TREE_CODE (expr1
) != TREE_CODE (expr2
))
1568 return operand_equal_p (expr1
, expr2
, 0);
1571 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
1572 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
1576 get_mem_align_offset (rtx mem
, unsigned int align
)
1579 unsigned HOST_WIDE_INT offset
;
1581 /* This function can't use
1582 if (!MEM_EXPR (mem) || !MEM_OFFSET_KNOWN_P (mem)
1583 || (MAX (MEM_ALIGN (mem),
1584 MAX (align, get_object_alignment (MEM_EXPR (mem))))
1588 return (- MEM_OFFSET (mem)) & (align / BITS_PER_UNIT - 1);
1590 - COMPONENT_REFs in MEM_EXPR can have NULL first operand,
1591 for <variable>. get_inner_reference doesn't handle it and
1592 even if it did, the alignment in that case needs to be determined
1593 from DECL_FIELD_CONTEXT's TYPE_ALIGN.
1594 - it would do suboptimal job for COMPONENT_REFs, even if MEM_EXPR
1595 isn't sufficiently aligned, the object it is in might be. */
1596 gcc_assert (MEM_P (mem
));
1597 expr
= MEM_EXPR (mem
);
1598 if (expr
== NULL_TREE
|| !MEM_OFFSET_KNOWN_P (mem
))
1601 offset
= MEM_OFFSET (mem
);
1604 if (DECL_ALIGN (expr
) < align
)
1607 else if (INDIRECT_REF_P (expr
))
1609 if (TYPE_ALIGN (TREE_TYPE (expr
)) < (unsigned int) align
)
1612 else if (TREE_CODE (expr
) == COMPONENT_REF
)
1616 tree inner
= TREE_OPERAND (expr
, 0);
1617 tree field
= TREE_OPERAND (expr
, 1);
1618 tree byte_offset
= component_ref_field_offset (expr
);
1619 tree bit_offset
= DECL_FIELD_BIT_OFFSET (field
);
1622 || !tree_fits_uhwi_p (byte_offset
)
1623 || !tree_fits_uhwi_p (bit_offset
))
1626 offset
+= tree_to_uhwi (byte_offset
);
1627 offset
+= tree_to_uhwi (bit_offset
) / BITS_PER_UNIT
;
1629 if (inner
== NULL_TREE
)
1631 if (TYPE_ALIGN (DECL_FIELD_CONTEXT (field
))
1632 < (unsigned int) align
)
1636 else if (DECL_P (inner
))
1638 if (DECL_ALIGN (inner
) < align
)
1642 else if (TREE_CODE (inner
) != COMPONENT_REF
)
1650 return offset
& ((align
/ BITS_PER_UNIT
) - 1);
1653 /* Given REF (a MEM) and T, either the type of X or the expression
1654 corresponding to REF, set the memory attributes. OBJECTP is nonzero
1655 if we are making a new object of this type. BITPOS is nonzero if
1656 there is an offset outstanding on T that will be applied later. */
1659 set_mem_attributes_minus_bitpos (rtx ref
, tree t
, int objectp
,
1660 HOST_WIDE_INT bitpos
)
1662 HOST_WIDE_INT apply_bitpos
= 0;
1664 struct mem_attrs attrs
, *defattrs
, *refattrs
;
1667 /* It can happen that type_for_mode was given a mode for which there
1668 is no language-level type. In which case it returns NULL, which
1673 type
= TYPE_P (t
) ? t
: TREE_TYPE (t
);
1674 if (type
== error_mark_node
)
1677 /* If we have already set DECL_RTL = ref, get_alias_set will get the
1678 wrong answer, as it assumes that DECL_RTL already has the right alias
1679 info. Callers should not set DECL_RTL until after the call to
1680 set_mem_attributes. */
1681 gcc_assert (!DECL_P (t
) || ref
!= DECL_RTL_IF_SET (t
));
1683 memset (&attrs
, 0, sizeof (attrs
));
1685 /* Get the alias set from the expression or type (perhaps using a
1686 front-end routine) and use it. */
1687 attrs
.alias
= get_alias_set (t
);
1689 MEM_VOLATILE_P (ref
) |= TYPE_VOLATILE (type
);
1690 MEM_POINTER (ref
) = POINTER_TYPE_P (type
);
1692 /* Default values from pre-existing memory attributes if present. */
1693 refattrs
= MEM_ATTRS (ref
);
1696 /* ??? Can this ever happen? Calling this routine on a MEM that
1697 already carries memory attributes should probably be invalid. */
1698 attrs
.expr
= refattrs
->expr
;
1699 attrs
.offset_known_p
= refattrs
->offset_known_p
;
1700 attrs
.offset
= refattrs
->offset
;
1701 attrs
.size_known_p
= refattrs
->size_known_p
;
1702 attrs
.size
= refattrs
->size
;
1703 attrs
.align
= refattrs
->align
;
1706 /* Otherwise, default values from the mode of the MEM reference. */
1709 defattrs
= mode_mem_attrs
[(int) GET_MODE (ref
)];
1710 gcc_assert (!defattrs
->expr
);
1711 gcc_assert (!defattrs
->offset_known_p
);
1713 /* Respect mode size. */
1714 attrs
.size_known_p
= defattrs
->size_known_p
;
1715 attrs
.size
= defattrs
->size
;
1716 /* ??? Is this really necessary? We probably should always get
1717 the size from the type below. */
1719 /* Respect mode alignment for STRICT_ALIGNMENT targets if T is a type;
1720 if T is an object, always compute the object alignment below. */
1722 attrs
.align
= defattrs
->align
;
1724 attrs
.align
= BITS_PER_UNIT
;
1725 /* ??? If T is a type, respecting mode alignment may *also* be wrong
1726 e.g. if the type carries an alignment attribute. Should we be
1727 able to simply always use TYPE_ALIGN? */
1730 /* We can set the alignment from the type if we are making an object,
1731 this is an INDIRECT_REF, or if TYPE_ALIGN_OK. */
1732 if (objectp
|| TREE_CODE (t
) == INDIRECT_REF
|| TYPE_ALIGN_OK (type
))
1733 attrs
.align
= MAX (attrs
.align
, TYPE_ALIGN (type
));
1735 /* If the size is known, we can set that. */
1736 tree new_size
= TYPE_SIZE_UNIT (type
);
1738 /* The address-space is that of the type. */
1739 as
= TYPE_ADDR_SPACE (type
);
1741 /* If T is not a type, we may be able to deduce some more information about
1747 if (TREE_THIS_VOLATILE (t
))
1748 MEM_VOLATILE_P (ref
) = 1;
1750 /* Now remove any conversions: they don't change what the underlying
1751 object is. Likewise for SAVE_EXPR. */
1752 while (CONVERT_EXPR_P (t
)
1753 || TREE_CODE (t
) == VIEW_CONVERT_EXPR
1754 || TREE_CODE (t
) == SAVE_EXPR
)
1755 t
= TREE_OPERAND (t
, 0);
1757 /* Note whether this expression can trap. */
1758 MEM_NOTRAP_P (ref
) = !tree_could_trap_p (t
);
1760 base
= get_base_address (t
);
1764 && TREE_READONLY (base
)
1765 && (TREE_STATIC (base
) || DECL_EXTERNAL (base
))
1766 && !TREE_THIS_VOLATILE (base
))
1767 MEM_READONLY_P (ref
) = 1;
1769 /* Mark static const strings readonly as well. */
1770 if (TREE_CODE (base
) == STRING_CST
1771 && TREE_READONLY (base
)
1772 && TREE_STATIC (base
))
1773 MEM_READONLY_P (ref
) = 1;
1775 /* Address-space information is on the base object. */
1776 if (TREE_CODE (base
) == MEM_REF
1777 || TREE_CODE (base
) == TARGET_MEM_REF
)
1778 as
= TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (base
,
1781 as
= TYPE_ADDR_SPACE (TREE_TYPE (base
));
1784 /* If this expression uses it's parent's alias set, mark it such
1785 that we won't change it. */
1786 if (component_uses_parent_alias_set_from (t
) != NULL_TREE
)
1787 MEM_KEEP_ALIAS_SET_P (ref
) = 1;
1789 /* If this is a decl, set the attributes of the MEM from it. */
1793 attrs
.offset_known_p
= true;
1795 apply_bitpos
= bitpos
;
1796 new_size
= DECL_SIZE_UNIT (t
);
1799 /* ??? If we end up with a constant here do record a MEM_EXPR. */
1800 else if (CONSTANT_CLASS_P (t
))
1803 /* If this is a field reference, record it. */
1804 else if (TREE_CODE (t
) == COMPONENT_REF
)
1807 attrs
.offset_known_p
= true;
1809 apply_bitpos
= bitpos
;
1810 if (DECL_BIT_FIELD (TREE_OPERAND (t
, 1)))
1811 new_size
= DECL_SIZE_UNIT (TREE_OPERAND (t
, 1));
1814 /* If this is an array reference, look for an outer field reference. */
1815 else if (TREE_CODE (t
) == ARRAY_REF
)
1817 tree off_tree
= size_zero_node
;
1818 /* We can't modify t, because we use it at the end of the
1824 tree index
= TREE_OPERAND (t2
, 1);
1825 tree low_bound
= array_ref_low_bound (t2
);
1826 tree unit_size
= array_ref_element_size (t2
);
1828 /* We assume all arrays have sizes that are a multiple of a byte.
1829 First subtract the lower bound, if any, in the type of the
1830 index, then convert to sizetype and multiply by the size of
1831 the array element. */
1832 if (! integer_zerop (low_bound
))
1833 index
= fold_build2 (MINUS_EXPR
, TREE_TYPE (index
),
1836 off_tree
= size_binop (PLUS_EXPR
,
1837 size_binop (MULT_EXPR
,
1838 fold_convert (sizetype
,
1842 t2
= TREE_OPERAND (t2
, 0);
1844 while (TREE_CODE (t2
) == ARRAY_REF
);
1847 || TREE_CODE (t2
) == COMPONENT_REF
)
1850 attrs
.offset_known_p
= false;
1851 if (tree_fits_uhwi_p (off_tree
))
1853 attrs
.offset_known_p
= true;
1854 attrs
.offset
= tree_to_uhwi (off_tree
);
1855 apply_bitpos
= bitpos
;
1858 /* Else do not record a MEM_EXPR. */
1861 /* If this is an indirect reference, record it. */
1862 else if (TREE_CODE (t
) == MEM_REF
1863 || TREE_CODE (t
) == TARGET_MEM_REF
)
1866 attrs
.offset_known_p
= true;
1868 apply_bitpos
= bitpos
;
1871 /* Compute the alignment. */
1872 unsigned int obj_align
;
1873 unsigned HOST_WIDE_INT obj_bitpos
;
1874 get_object_alignment_1 (t
, &obj_align
, &obj_bitpos
);
1875 obj_bitpos
= (obj_bitpos
- bitpos
) & (obj_align
- 1);
1876 if (obj_bitpos
!= 0)
1877 obj_align
= (obj_bitpos
& -obj_bitpos
);
1878 attrs
.align
= MAX (attrs
.align
, obj_align
);
1881 if (tree_fits_uhwi_p (new_size
))
1883 attrs
.size_known_p
= true;
1884 attrs
.size
= tree_to_uhwi (new_size
);
1887 /* If we modified OFFSET based on T, then subtract the outstanding
1888 bit position offset. Similarly, increase the size of the accessed
1889 object to contain the negative offset. */
1892 gcc_assert (attrs
.offset_known_p
);
1893 attrs
.offset
-= apply_bitpos
/ BITS_PER_UNIT
;
1894 if (attrs
.size_known_p
)
1895 attrs
.size
+= apply_bitpos
/ BITS_PER_UNIT
;
1898 /* Now set the attributes we computed above. */
1899 attrs
.addrspace
= as
;
1900 set_mem_attrs (ref
, &attrs
);
1904 set_mem_attributes (rtx ref
, tree t
, int objectp
)
1906 set_mem_attributes_minus_bitpos (ref
, t
, objectp
, 0);
1909 /* Set the alias set of MEM to SET. */
1912 set_mem_alias_set (rtx mem
, alias_set_type set
)
1914 struct mem_attrs attrs
;
1916 /* If the new and old alias sets don't conflict, something is wrong. */
1917 gcc_checking_assert (alias_sets_conflict_p (set
, MEM_ALIAS_SET (mem
)));
1918 attrs
= *get_mem_attrs (mem
);
1920 set_mem_attrs (mem
, &attrs
);
1923 /* Set the address space of MEM to ADDRSPACE (target-defined). */
1926 set_mem_addr_space (rtx mem
, addr_space_t addrspace
)
1928 struct mem_attrs attrs
;
1930 attrs
= *get_mem_attrs (mem
);
1931 attrs
.addrspace
= addrspace
;
1932 set_mem_attrs (mem
, &attrs
);
1935 /* Set the alignment of MEM to ALIGN bits. */
1938 set_mem_align (rtx mem
, unsigned int align
)
1940 struct mem_attrs attrs
;
1942 attrs
= *get_mem_attrs (mem
);
1943 attrs
.align
= align
;
1944 set_mem_attrs (mem
, &attrs
);
1947 /* Set the expr for MEM to EXPR. */
1950 set_mem_expr (rtx mem
, tree expr
)
1952 struct mem_attrs attrs
;
1954 attrs
= *get_mem_attrs (mem
);
1956 set_mem_attrs (mem
, &attrs
);
1959 /* Set the offset of MEM to OFFSET. */
1962 set_mem_offset (rtx mem
, HOST_WIDE_INT offset
)
1964 struct mem_attrs attrs
;
1966 attrs
= *get_mem_attrs (mem
);
1967 attrs
.offset_known_p
= true;
1968 attrs
.offset
= offset
;
1969 set_mem_attrs (mem
, &attrs
);
1972 /* Clear the offset of MEM. */
1975 clear_mem_offset (rtx mem
)
1977 struct mem_attrs attrs
;
1979 attrs
= *get_mem_attrs (mem
);
1980 attrs
.offset_known_p
= false;
1981 set_mem_attrs (mem
, &attrs
);
1984 /* Set the size of MEM to SIZE. */
1987 set_mem_size (rtx mem
, HOST_WIDE_INT size
)
1989 struct mem_attrs attrs
;
1991 attrs
= *get_mem_attrs (mem
);
1992 attrs
.size_known_p
= true;
1994 set_mem_attrs (mem
, &attrs
);
1997 /* Clear the size of MEM. */
2000 clear_mem_size (rtx mem
)
2002 struct mem_attrs attrs
;
2004 attrs
= *get_mem_attrs (mem
);
2005 attrs
.size_known_p
= false;
2006 set_mem_attrs (mem
, &attrs
);
2009 /* Return a memory reference like MEMREF, but with its mode changed to MODE
2010 and its address changed to ADDR. (VOIDmode means don't change the mode.
2011 NULL for ADDR means don't change the address.) VALIDATE is nonzero if the
2012 returned memory location is required to be valid. INPLACE is true if any
2013 changes can be made directly to MEMREF or false if MEMREF must be treated
2016 The memory attributes are not changed. */
2019 change_address_1 (rtx memref
, enum machine_mode mode
, rtx addr
, int validate
,
2025 gcc_assert (MEM_P (memref
));
2026 as
= MEM_ADDR_SPACE (memref
);
2027 if (mode
== VOIDmode
)
2028 mode
= GET_MODE (memref
);
2030 addr
= XEXP (memref
, 0);
2031 if (mode
== GET_MODE (memref
) && addr
== XEXP (memref
, 0)
2032 && (!validate
|| memory_address_addr_space_p (mode
, addr
, as
)))
2035 /* Don't validate address for LRA. LRA can make the address valid
2036 by itself in most efficient way. */
2037 if (validate
&& !lra_in_progress
)
2039 if (reload_in_progress
|| reload_completed
)
2040 gcc_assert (memory_address_addr_space_p (mode
, addr
, as
));
2042 addr
= memory_address_addr_space (mode
, addr
, as
);
2045 if (rtx_equal_p (addr
, XEXP (memref
, 0)) && mode
== GET_MODE (memref
))
2050 XEXP (memref
, 0) = addr
;
2054 new_rtx
= gen_rtx_MEM (mode
, addr
);
2055 MEM_COPY_ATTRIBUTES (new_rtx
, memref
);
2059 /* Like change_address_1 with VALIDATE nonzero, but we are not saying in what
2060 way we are changing MEMREF, so we only preserve the alias set. */
2063 change_address (rtx memref
, enum machine_mode mode
, rtx addr
)
2065 rtx new_rtx
= change_address_1 (memref
, mode
, addr
, 1, false);
2066 enum machine_mode mmode
= GET_MODE (new_rtx
);
2067 struct mem_attrs attrs
, *defattrs
;
2069 attrs
= *get_mem_attrs (memref
);
2070 defattrs
= mode_mem_attrs
[(int) mmode
];
2071 attrs
.expr
= NULL_TREE
;
2072 attrs
.offset_known_p
= false;
2073 attrs
.size_known_p
= defattrs
->size_known_p
;
2074 attrs
.size
= defattrs
->size
;
2075 attrs
.align
= defattrs
->align
;
2077 /* If there are no changes, just return the original memory reference. */
2078 if (new_rtx
== memref
)
2080 if (mem_attrs_eq_p (get_mem_attrs (memref
), &attrs
))
2083 new_rtx
= gen_rtx_MEM (mmode
, XEXP (memref
, 0));
2084 MEM_COPY_ATTRIBUTES (new_rtx
, memref
);
2087 set_mem_attrs (new_rtx
, &attrs
);
2091 /* Return a memory reference like MEMREF, but with its mode changed
2092 to MODE and its address offset by OFFSET bytes. If VALIDATE is
2093 nonzero, the memory address is forced to be valid.
2094 If ADJUST_ADDRESS is zero, OFFSET is only used to update MEM_ATTRS
2095 and the caller is responsible for adjusting MEMREF base register.
2096 If ADJUST_OBJECT is zero, the underlying object associated with the
2097 memory reference is left unchanged and the caller is responsible for
2098 dealing with it. Otherwise, if the new memory reference is outside
2099 the underlying object, even partially, then the object is dropped.
2100 SIZE, if nonzero, is the size of an access in cases where MODE
2101 has no inherent size. */
2104 adjust_address_1 (rtx memref
, enum machine_mode mode
, HOST_WIDE_INT offset
,
2105 int validate
, int adjust_address
, int adjust_object
,
2108 rtx addr
= XEXP (memref
, 0);
2110 enum machine_mode address_mode
;
2112 struct mem_attrs attrs
= *get_mem_attrs (memref
), *defattrs
;
2113 unsigned HOST_WIDE_INT max_align
;
2114 #ifdef POINTERS_EXTEND_UNSIGNED
2115 enum machine_mode pointer_mode
2116 = targetm
.addr_space
.pointer_mode (attrs
.addrspace
);
2119 /* VOIDmode means no mode change for change_address_1. */
2120 if (mode
== VOIDmode
)
2121 mode
= GET_MODE (memref
);
2123 /* Take the size of non-BLKmode accesses from the mode. */
2124 defattrs
= mode_mem_attrs
[(int) mode
];
2125 if (defattrs
->size_known_p
)
2126 size
= defattrs
->size
;
2128 /* If there are no changes, just return the original memory reference. */
2129 if (mode
== GET_MODE (memref
) && !offset
2130 && (size
== 0 || (attrs
.size_known_p
&& attrs
.size
== size
))
2131 && (!validate
|| memory_address_addr_space_p (mode
, addr
,
2135 /* ??? Prefer to create garbage instead of creating shared rtl.
2136 This may happen even if offset is nonzero -- consider
2137 (plus (plus reg reg) const_int) -- so do this always. */
2138 addr
= copy_rtx (addr
);
2140 /* Convert a possibly large offset to a signed value within the
2141 range of the target address space. */
2142 address_mode
= get_address_mode (memref
);
2143 pbits
= GET_MODE_BITSIZE (address_mode
);
2144 if (HOST_BITS_PER_WIDE_INT
> pbits
)
2146 int shift
= HOST_BITS_PER_WIDE_INT
- pbits
;
2147 offset
= (((HOST_WIDE_INT
) ((unsigned HOST_WIDE_INT
) offset
<< shift
))
2153 /* If MEMREF is a LO_SUM and the offset is within the alignment of the
2154 object, we can merge it into the LO_SUM. */
2155 if (GET_MODE (memref
) != BLKmode
&& GET_CODE (addr
) == LO_SUM
2157 && (unsigned HOST_WIDE_INT
) offset
2158 < GET_MODE_ALIGNMENT (GET_MODE (memref
)) / BITS_PER_UNIT
)
2159 addr
= gen_rtx_LO_SUM (address_mode
, XEXP (addr
, 0),
2160 plus_constant (address_mode
,
2161 XEXP (addr
, 1), offset
));
2162 #ifdef POINTERS_EXTEND_UNSIGNED
2163 /* If MEMREF is a ZERO_EXTEND from pointer_mode and the offset is valid
2164 in that mode, we merge it into the ZERO_EXTEND. We take advantage of
2165 the fact that pointers are not allowed to overflow. */
2166 else if (POINTERS_EXTEND_UNSIGNED
> 0
2167 && GET_CODE (addr
) == ZERO_EXTEND
2168 && GET_MODE (XEXP (addr
, 0)) == pointer_mode
2169 && trunc_int_for_mode (offset
, pointer_mode
) == offset
)
2170 addr
= gen_rtx_ZERO_EXTEND (address_mode
,
2171 plus_constant (pointer_mode
,
2172 XEXP (addr
, 0), offset
));
2175 addr
= plus_constant (address_mode
, addr
, offset
);
2178 new_rtx
= change_address_1 (memref
, mode
, addr
, validate
, false);
2180 /* If the address is a REG, change_address_1 rightfully returns memref,
2181 but this would destroy memref's MEM_ATTRS. */
2182 if (new_rtx
== memref
&& offset
!= 0)
2183 new_rtx
= copy_rtx (new_rtx
);
2185 /* Conservatively drop the object if we don't know where we start from. */
2186 if (adjust_object
&& (!attrs
.offset_known_p
|| !attrs
.size_known_p
))
2188 attrs
.expr
= NULL_TREE
;
2192 /* Compute the new values of the memory attributes due to this adjustment.
2193 We add the offsets and update the alignment. */
2194 if (attrs
.offset_known_p
)
2196 attrs
.offset
+= offset
;
2198 /* Drop the object if the new left end is not within its bounds. */
2199 if (adjust_object
&& attrs
.offset
< 0)
2201 attrs
.expr
= NULL_TREE
;
2206 /* Compute the new alignment by taking the MIN of the alignment and the
2207 lowest-order set bit in OFFSET, but don't change the alignment if OFFSET
2211 max_align
= (offset
& -offset
) * BITS_PER_UNIT
;
2212 attrs
.align
= MIN (attrs
.align
, max_align
);
2217 /* Drop the object if the new right end is not within its bounds. */
2218 if (adjust_object
&& (offset
+ size
) > attrs
.size
)
2220 attrs
.expr
= NULL_TREE
;
2223 attrs
.size_known_p
= true;
2226 else if (attrs
.size_known_p
)
2228 gcc_assert (!adjust_object
);
2229 attrs
.size
-= offset
;
2230 /* ??? The store_by_pieces machinery generates negative sizes,
2231 so don't assert for that here. */
2234 set_mem_attrs (new_rtx
, &attrs
);
2239 /* Return a memory reference like MEMREF, but with its mode changed
2240 to MODE and its address changed to ADDR, which is assumed to be
2241 MEMREF offset by OFFSET bytes. If VALIDATE is
2242 nonzero, the memory address is forced to be valid. */
2245 adjust_automodify_address_1 (rtx memref
, enum machine_mode mode
, rtx addr
,
2246 HOST_WIDE_INT offset
, int validate
)
2248 memref
= change_address_1 (memref
, VOIDmode
, addr
, validate
, false);
2249 return adjust_address_1 (memref
, mode
, offset
, validate
, 0, 0, 0);
2252 /* Return a memory reference like MEMREF, but whose address is changed by
2253 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
2254 known to be in OFFSET (possibly 1). */
2257 offset_address (rtx memref
, rtx offset
, unsigned HOST_WIDE_INT pow2
)
2259 rtx new_rtx
, addr
= XEXP (memref
, 0);
2260 enum machine_mode address_mode
;
2261 struct mem_attrs attrs
, *defattrs
;
2263 attrs
= *get_mem_attrs (memref
);
2264 address_mode
= get_address_mode (memref
);
2265 new_rtx
= simplify_gen_binary (PLUS
, address_mode
, addr
, offset
);
2267 /* At this point we don't know _why_ the address is invalid. It
2268 could have secondary memory references, multiplies or anything.
2270 However, if we did go and rearrange things, we can wind up not
2271 being able to recognize the magic around pic_offset_table_rtx.
2272 This stuff is fragile, and is yet another example of why it is
2273 bad to expose PIC machinery too early. */
2274 if (! memory_address_addr_space_p (GET_MODE (memref
), new_rtx
,
2276 && GET_CODE (addr
) == PLUS
2277 && XEXP (addr
, 0) == pic_offset_table_rtx
)
2279 addr
= force_reg (GET_MODE (addr
), addr
);
2280 new_rtx
= simplify_gen_binary (PLUS
, address_mode
, addr
, offset
);
2283 update_temp_slot_address (XEXP (memref
, 0), new_rtx
);
2284 new_rtx
= change_address_1 (memref
, VOIDmode
, new_rtx
, 1, false);
2286 /* If there are no changes, just return the original memory reference. */
2287 if (new_rtx
== memref
)
2290 /* Update the alignment to reflect the offset. Reset the offset, which
2292 defattrs
= mode_mem_attrs
[(int) GET_MODE (new_rtx
)];
2293 attrs
.offset_known_p
= false;
2294 attrs
.size_known_p
= defattrs
->size_known_p
;
2295 attrs
.size
= defattrs
->size
;
2296 attrs
.align
= MIN (attrs
.align
, pow2
* BITS_PER_UNIT
);
2297 set_mem_attrs (new_rtx
, &attrs
);
2301 /* Return a memory reference like MEMREF, but with its address changed to
2302 ADDR. The caller is asserting that the actual piece of memory pointed
2303 to is the same, just the form of the address is being changed, such as
2304 by putting something into a register. INPLACE is true if any changes
2305 can be made directly to MEMREF or false if MEMREF must be treated as
2309 replace_equiv_address (rtx memref
, rtx addr
, bool inplace
)
2311 /* change_address_1 copies the memory attribute structure without change
2312 and that's exactly what we want here. */
2313 update_temp_slot_address (XEXP (memref
, 0), addr
);
2314 return change_address_1 (memref
, VOIDmode
, addr
, 1, inplace
);
2317 /* Likewise, but the reference is not required to be valid. */
2320 replace_equiv_address_nv (rtx memref
, rtx addr
, bool inplace
)
2322 return change_address_1 (memref
, VOIDmode
, addr
, 0, inplace
);
2325 /* Return a memory reference like MEMREF, but with its mode widened to
2326 MODE and offset by OFFSET. This would be used by targets that e.g.
2327 cannot issue QImode memory operations and have to use SImode memory
2328 operations plus masking logic. */
2331 widen_memory_access (rtx memref
, enum machine_mode mode
, HOST_WIDE_INT offset
)
2333 rtx new_rtx
= adjust_address_1 (memref
, mode
, offset
, 1, 1, 0, 0);
2334 struct mem_attrs attrs
;
2335 unsigned int size
= GET_MODE_SIZE (mode
);
2337 /* If there are no changes, just return the original memory reference. */
2338 if (new_rtx
== memref
)
2341 attrs
= *get_mem_attrs (new_rtx
);
2343 /* If we don't know what offset we were at within the expression, then
2344 we can't know if we've overstepped the bounds. */
2345 if (! attrs
.offset_known_p
)
2346 attrs
.expr
= NULL_TREE
;
2350 if (TREE_CODE (attrs
.expr
) == COMPONENT_REF
)
2352 tree field
= TREE_OPERAND (attrs
.expr
, 1);
2353 tree offset
= component_ref_field_offset (attrs
.expr
);
2355 if (! DECL_SIZE_UNIT (field
))
2357 attrs
.expr
= NULL_TREE
;
2361 /* Is the field at least as large as the access? If so, ok,
2362 otherwise strip back to the containing structure. */
2363 if (TREE_CODE (DECL_SIZE_UNIT (field
)) == INTEGER_CST
2364 && compare_tree_int (DECL_SIZE_UNIT (field
), size
) >= 0
2365 && attrs
.offset
>= 0)
2368 if (! tree_fits_uhwi_p (offset
))
2370 attrs
.expr
= NULL_TREE
;
2374 attrs
.expr
= TREE_OPERAND (attrs
.expr
, 0);
2375 attrs
.offset
+= tree_to_uhwi (offset
);
2376 attrs
.offset
+= (tree_to_uhwi (DECL_FIELD_BIT_OFFSET (field
))
2379 /* Similarly for the decl. */
2380 else if (DECL_P (attrs
.expr
)
2381 && DECL_SIZE_UNIT (attrs
.expr
)
2382 && TREE_CODE (DECL_SIZE_UNIT (attrs
.expr
)) == INTEGER_CST
2383 && compare_tree_int (DECL_SIZE_UNIT (attrs
.expr
), size
) >= 0
2384 && (! attrs
.offset_known_p
|| attrs
.offset
>= 0))
2388 /* The widened memory access overflows the expression, which means
2389 that it could alias another expression. Zap it. */
2390 attrs
.expr
= NULL_TREE
;
2396 attrs
.offset_known_p
= false;
2398 /* The widened memory may alias other stuff, so zap the alias set. */
2399 /* ??? Maybe use get_alias_set on any remaining expression. */
2401 attrs
.size_known_p
= true;
2403 set_mem_attrs (new_rtx
, &attrs
);
2407 /* A fake decl that is used as the MEM_EXPR of spill slots. */
2408 static GTY(()) tree spill_slot_decl
;
2411 get_spill_slot_decl (bool force_build_p
)
2413 tree d
= spill_slot_decl
;
2415 struct mem_attrs attrs
;
2417 if (d
|| !force_build_p
)
2420 d
= build_decl (DECL_SOURCE_LOCATION (current_function_decl
),
2421 VAR_DECL
, get_identifier ("%sfp"), void_type_node
);
2422 DECL_ARTIFICIAL (d
) = 1;
2423 DECL_IGNORED_P (d
) = 1;
2425 spill_slot_decl
= d
;
2427 rd
= gen_rtx_MEM (BLKmode
, frame_pointer_rtx
);
2428 MEM_NOTRAP_P (rd
) = 1;
2429 attrs
= *mode_mem_attrs
[(int) BLKmode
];
2430 attrs
.alias
= new_alias_set ();
2432 set_mem_attrs (rd
, &attrs
);
2433 SET_DECL_RTL (d
, rd
);
2438 /* Given MEM, a result from assign_stack_local, fill in the memory
2439 attributes as appropriate for a register allocator spill slot.
2440 These slots are not aliasable by other memory. We arrange for
2441 them all to use a single MEM_EXPR, so that the aliasing code can
2442 work properly in the case of shared spill slots. */
2445 set_mem_attrs_for_spill (rtx mem
)
2447 struct mem_attrs attrs
;
2450 attrs
= *get_mem_attrs (mem
);
2451 attrs
.expr
= get_spill_slot_decl (true);
2452 attrs
.alias
= MEM_ALIAS_SET (DECL_RTL (attrs
.expr
));
2453 attrs
.addrspace
= ADDR_SPACE_GENERIC
;
2455 /* We expect the incoming memory to be of the form:
2456 (mem:MODE (plus (reg sfp) (const_int offset)))
2457 with perhaps the plus missing for offset = 0. */
2458 addr
= XEXP (mem
, 0);
2459 attrs
.offset_known_p
= true;
2461 if (GET_CODE (addr
) == PLUS
2462 && CONST_INT_P (XEXP (addr
, 1)))
2463 attrs
.offset
= INTVAL (XEXP (addr
, 1));
2465 set_mem_attrs (mem
, &attrs
);
2466 MEM_NOTRAP_P (mem
) = 1;
2469 /* Return a newly created CODE_LABEL rtx with a unique label number. */
2472 gen_label_rtx (void)
2474 return gen_rtx_CODE_LABEL (VOIDmode
, NULL_RTX
, NULL_RTX
,
2475 NULL
, label_num
++, NULL
);
2478 /* For procedure integration. */
2480 /* Install new pointers to the first and last insns in the chain.
2481 Also, set cur_insn_uid to one higher than the last in use.
2482 Used for an inline-procedure after copying the insn chain. */
2485 set_new_first_and_last_insn (rtx first
, rtx last
)
2489 set_first_insn (first
);
2490 set_last_insn (last
);
2493 if (MIN_NONDEBUG_INSN_UID
|| MAY_HAVE_DEBUG_INSNS
)
2495 int debug_count
= 0;
2497 cur_insn_uid
= MIN_NONDEBUG_INSN_UID
- 1;
2498 cur_debug_insn_uid
= 0;
2500 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
2501 if (INSN_UID (insn
) < MIN_NONDEBUG_INSN_UID
)
2502 cur_debug_insn_uid
= MAX (cur_debug_insn_uid
, INSN_UID (insn
));
2505 cur_insn_uid
= MAX (cur_insn_uid
, INSN_UID (insn
));
2506 if (DEBUG_INSN_P (insn
))
2511 cur_debug_insn_uid
= MIN_NONDEBUG_INSN_UID
+ debug_count
;
2513 cur_debug_insn_uid
++;
2516 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
2517 cur_insn_uid
= MAX (cur_insn_uid
, INSN_UID (insn
));
2522 /* Go through all the RTL insn bodies and copy any invalid shared
2523 structure. This routine should only be called once. */
2526 unshare_all_rtl_1 (rtx insn
)
2528 /* Unshare just about everything else. */
2529 unshare_all_rtl_in_chain (insn
);
2531 /* Make sure the addresses of stack slots found outside the insn chain
2532 (such as, in DECL_RTL of a variable) are not shared
2533 with the insn chain.
2535 This special care is necessary when the stack slot MEM does not
2536 actually appear in the insn chain. If it does appear, its address
2537 is unshared from all else at that point. */
2538 stack_slot_list
= copy_rtx_if_shared (stack_slot_list
);
2541 /* Go through all the RTL insn bodies and copy any invalid shared
2542 structure, again. This is a fairly expensive thing to do so it
2543 should be done sparingly. */
2546 unshare_all_rtl_again (rtx insn
)
2551 for (p
= insn
; p
; p
= NEXT_INSN (p
))
2554 reset_used_flags (PATTERN (p
));
2555 reset_used_flags (REG_NOTES (p
));
2557 reset_used_flags (CALL_INSN_FUNCTION_USAGE (p
));
2560 /* Make sure that virtual stack slots are not shared. */
2561 set_used_decls (DECL_INITIAL (cfun
->decl
));
2563 /* Make sure that virtual parameters are not shared. */
2564 for (decl
= DECL_ARGUMENTS (cfun
->decl
); decl
; decl
= DECL_CHAIN (decl
))
2565 set_used_flags (DECL_RTL (decl
));
2567 reset_used_flags (stack_slot_list
);
2569 unshare_all_rtl_1 (insn
);
2573 unshare_all_rtl (void)
2575 unshare_all_rtl_1 (get_insns ());
2580 /* Check that ORIG is not marked when it should not be and mark ORIG as in use,
2581 Recursively does the same for subexpressions. */
2584 verify_rtx_sharing (rtx orig
, rtx insn
)
2589 const char *format_ptr
;
2594 code
= GET_CODE (x
);
2596 /* These types may be freely shared. */
2612 /* SCRATCH must be shared because they represent distinct values. */
2615 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
2616 clobbers or clobbers of hard registers that originated as pseudos.
2617 This is needed to allow safe register renaming. */
2618 if (REG_P (XEXP (x
, 0)) && REGNO (XEXP (x
, 0)) < FIRST_PSEUDO_REGISTER
2619 && ORIGINAL_REGNO (XEXP (x
, 0)) == REGNO (XEXP (x
, 0)))
2624 if (shared_const_p (orig
))
2629 /* A MEM is allowed to be shared if its address is constant. */
2630 if (CONSTANT_ADDRESS_P (XEXP (x
, 0))
2631 || reload_completed
|| reload_in_progress
)
2640 /* This rtx may not be shared. If it has already been seen,
2641 replace it with a copy of itself. */
2642 #ifdef ENABLE_CHECKING
2643 if (RTX_FLAG (x
, used
))
2645 error ("invalid rtl sharing found in the insn");
2647 error ("shared rtx");
2649 internal_error ("internal consistency failure");
2652 gcc_assert (!RTX_FLAG (x
, used
));
2654 RTX_FLAG (x
, used
) = 1;
2656 /* Now scan the subexpressions recursively. */
2658 format_ptr
= GET_RTX_FORMAT (code
);
2660 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++)
2662 switch (*format_ptr
++)
2665 verify_rtx_sharing (XEXP (x
, i
), insn
);
2669 if (XVEC (x
, i
) != NULL
)
2672 int len
= XVECLEN (x
, i
);
2674 for (j
= 0; j
< len
; j
++)
2676 /* We allow sharing of ASM_OPERANDS inside single
2678 if (j
&& GET_CODE (XVECEXP (x
, i
, j
)) == SET
2679 && (GET_CODE (SET_SRC (XVECEXP (x
, i
, j
)))
2681 verify_rtx_sharing (SET_DEST (XVECEXP (x
, i
, j
)), insn
);
2683 verify_rtx_sharing (XVECEXP (x
, i
, j
), insn
);
2692 /* Reset used-flags for INSN. */
2695 reset_insn_used_flags (rtx insn
)
2697 gcc_assert (INSN_P (insn
));
2698 reset_used_flags (PATTERN (insn
));
2699 reset_used_flags (REG_NOTES (insn
));
2701 reset_used_flags (CALL_INSN_FUNCTION_USAGE (insn
));
2704 /* Go through all the RTL insn bodies and clear all the USED bits. */
2707 reset_all_used_flags (void)
2711 for (p
= get_insns (); p
; p
= NEXT_INSN (p
))
2714 rtx pat
= PATTERN (p
);
2715 if (GET_CODE (pat
) != SEQUENCE
)
2716 reset_insn_used_flags (p
);
2719 gcc_assert (REG_NOTES (p
) == NULL
);
2720 for (int i
= 0; i
< XVECLEN (pat
, 0); i
++)
2721 reset_insn_used_flags (XVECEXP (pat
, 0, i
));
2726 /* Verify sharing in INSN. */
2729 verify_insn_sharing (rtx insn
)
2731 gcc_assert (INSN_P (insn
));
2732 reset_used_flags (PATTERN (insn
));
2733 reset_used_flags (REG_NOTES (insn
));
2735 reset_used_flags (CALL_INSN_FUNCTION_USAGE (insn
));
2738 /* Go through all the RTL insn bodies and check that there is no unexpected
2739 sharing in between the subexpressions. */
2742 verify_rtl_sharing (void)
2746 timevar_push (TV_VERIFY_RTL_SHARING
);
2748 reset_all_used_flags ();
2750 for (p
= get_insns (); p
; p
= NEXT_INSN (p
))
2753 rtx pat
= PATTERN (p
);
2754 if (GET_CODE (pat
) != SEQUENCE
)
2755 verify_insn_sharing (p
);
2757 for (int i
= 0; i
< XVECLEN (pat
, 0); i
++)
2758 verify_insn_sharing (XVECEXP (pat
, 0, i
));
2761 reset_all_used_flags ();
2763 timevar_pop (TV_VERIFY_RTL_SHARING
);
2766 /* Go through all the RTL insn bodies and copy any invalid shared structure.
2767 Assumes the mark bits are cleared at entry. */
2770 unshare_all_rtl_in_chain (rtx insn
)
2772 for (; insn
; insn
= NEXT_INSN (insn
))
2775 PATTERN (insn
) = copy_rtx_if_shared (PATTERN (insn
));
2776 REG_NOTES (insn
) = copy_rtx_if_shared (REG_NOTES (insn
));
2778 CALL_INSN_FUNCTION_USAGE (insn
)
2779 = copy_rtx_if_shared (CALL_INSN_FUNCTION_USAGE (insn
));
2783 /* Go through all virtual stack slots of a function and mark them as
2784 shared. We never replace the DECL_RTLs themselves with a copy,
2785 but expressions mentioned into a DECL_RTL cannot be shared with
2786 expressions in the instruction stream.
2788 Note that reload may convert pseudo registers into memories in-place.
2789 Pseudo registers are always shared, but MEMs never are. Thus if we
2790 reset the used flags on MEMs in the instruction stream, we must set
2791 them again on MEMs that appear in DECL_RTLs. */
2794 set_used_decls (tree blk
)
2799 for (t
= BLOCK_VARS (blk
); t
; t
= DECL_CHAIN (t
))
2800 if (DECL_RTL_SET_P (t
))
2801 set_used_flags (DECL_RTL (t
));
2803 /* Now process sub-blocks. */
2804 for (t
= BLOCK_SUBBLOCKS (blk
); t
; t
= BLOCK_CHAIN (t
))
2808 /* Mark ORIG as in use, and return a copy of it if it was already in use.
2809 Recursively does the same for subexpressions. Uses
2810 copy_rtx_if_shared_1 to reduce stack space. */
2813 copy_rtx_if_shared (rtx orig
)
2815 copy_rtx_if_shared_1 (&orig
);
2819 /* Mark *ORIG1 as in use, and set it to a copy of it if it was already in
2820 use. Recursively does the same for subexpressions. */
2823 copy_rtx_if_shared_1 (rtx
*orig1
)
2829 const char *format_ptr
;
2833 /* Repeat is used to turn tail-recursion into iteration. */
2840 code
= GET_CODE (x
);
2842 /* These types may be freely shared. */
2858 /* SCRATCH must be shared because they represent distinct values. */
2861 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
2862 clobbers or clobbers of hard registers that originated as pseudos.
2863 This is needed to allow safe register renaming. */
2864 if (REG_P (XEXP (x
, 0)) && REGNO (XEXP (x
, 0)) < FIRST_PSEUDO_REGISTER
2865 && ORIGINAL_REGNO (XEXP (x
, 0)) == REGNO (XEXP (x
, 0)))
2870 if (shared_const_p (x
))
2880 /* The chain of insns is not being copied. */
2887 /* This rtx may not be shared. If it has already been seen,
2888 replace it with a copy of itself. */
2890 if (RTX_FLAG (x
, used
))
2892 x
= shallow_copy_rtx (x
);
2895 RTX_FLAG (x
, used
) = 1;
2897 /* Now scan the subexpressions recursively.
2898 We can store any replaced subexpressions directly into X
2899 since we know X is not shared! Any vectors in X
2900 must be copied if X was copied. */
2902 format_ptr
= GET_RTX_FORMAT (code
);
2903 length
= GET_RTX_LENGTH (code
);
2906 for (i
= 0; i
< length
; i
++)
2908 switch (*format_ptr
++)
2912 copy_rtx_if_shared_1 (last_ptr
);
2913 last_ptr
= &XEXP (x
, i
);
2917 if (XVEC (x
, i
) != NULL
)
2920 int len
= XVECLEN (x
, i
);
2922 /* Copy the vector iff I copied the rtx and the length
2924 if (copied
&& len
> 0)
2925 XVEC (x
, i
) = gen_rtvec_v (len
, XVEC (x
, i
)->elem
);
2927 /* Call recursively on all inside the vector. */
2928 for (j
= 0; j
< len
; j
++)
2931 copy_rtx_if_shared_1 (last_ptr
);
2932 last_ptr
= &XVECEXP (x
, i
, j
);
2947 /* Set the USED bit in X and its non-shareable subparts to FLAG. */
2950 mark_used_flags (rtx x
, int flag
)
2954 const char *format_ptr
;
2957 /* Repeat is used to turn tail-recursion into iteration. */
2962 code
= GET_CODE (x
);
2964 /* These types may be freely shared so we needn't do any resetting
2988 /* The chain of insns is not being copied. */
2995 RTX_FLAG (x
, used
) = flag
;
2997 format_ptr
= GET_RTX_FORMAT (code
);
2998 length
= GET_RTX_LENGTH (code
);
3000 for (i
= 0; i
< length
; i
++)
3002 switch (*format_ptr
++)
3010 mark_used_flags (XEXP (x
, i
), flag
);
3014 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
3015 mark_used_flags (XVECEXP (x
, i
, j
), flag
);
3021 /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used
3022 to look for shared sub-parts. */
3025 reset_used_flags (rtx x
)
3027 mark_used_flags (x
, 0);
3030 /* Set all the USED bits in X to allow copy_rtx_if_shared to be used
3031 to look for shared sub-parts. */
3034 set_used_flags (rtx x
)
3036 mark_used_flags (x
, 1);
3039 /* Copy X if necessary so that it won't be altered by changes in OTHER.
3040 Return X or the rtx for the pseudo reg the value of X was copied into.
3041 OTHER must be valid as a SET_DEST. */
3044 make_safe_from (rtx x
, rtx other
)
3047 switch (GET_CODE (other
))
3050 other
= SUBREG_REG (other
);
3052 case STRICT_LOW_PART
:
3055 other
= XEXP (other
, 0);
3064 && GET_CODE (x
) != SUBREG
)
3066 && (REGNO (other
) < FIRST_PSEUDO_REGISTER
3067 || reg_mentioned_p (other
, x
))))
3069 rtx temp
= gen_reg_rtx (GET_MODE (x
));
3070 emit_move_insn (temp
, x
);
3076 /* Emission of insns (adding them to the doubly-linked list). */
3078 /* Return the last insn emitted, even if it is in a sequence now pushed. */
3081 get_last_insn_anywhere (void)
3083 struct sequence_stack
*stack
;
3084 if (get_last_insn ())
3085 return get_last_insn ();
3086 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
3087 if (stack
->last
!= 0)
3092 /* Return the first nonnote insn emitted in current sequence or current
3093 function. This routine looks inside SEQUENCEs. */
3096 get_first_nonnote_insn (void)
3098 rtx insn
= get_insns ();
3103 for (insn
= next_insn (insn
);
3104 insn
&& NOTE_P (insn
);
3105 insn
= next_insn (insn
))
3109 if (NONJUMP_INSN_P (insn
)
3110 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3111 insn
= XVECEXP (PATTERN (insn
), 0, 0);
3118 /* Return the last nonnote insn emitted in current sequence or current
3119 function. This routine looks inside SEQUENCEs. */
3122 get_last_nonnote_insn (void)
3124 rtx insn
= get_last_insn ();
3129 for (insn
= previous_insn (insn
);
3130 insn
&& NOTE_P (insn
);
3131 insn
= previous_insn (insn
))
3135 if (NONJUMP_INSN_P (insn
)
3136 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3137 insn
= XVECEXP (PATTERN (insn
), 0,
3138 XVECLEN (PATTERN (insn
), 0) - 1);
3145 /* Return the number of actual (non-debug) insns emitted in this
3149 get_max_insn_count (void)
3151 int n
= cur_insn_uid
;
3153 /* The table size must be stable across -g, to avoid codegen
3154 differences due to debug insns, and not be affected by
3155 -fmin-insn-uid, to avoid excessive table size and to simplify
3156 debugging of -fcompare-debug failures. */
3157 if (cur_debug_insn_uid
> MIN_NONDEBUG_INSN_UID
)
3158 n
-= cur_debug_insn_uid
;
3160 n
-= MIN_NONDEBUG_INSN_UID
;
3166 /* Return the next insn. If it is a SEQUENCE, return the first insn
3170 next_insn (rtx insn
)
3174 insn
= NEXT_INSN (insn
);
3175 if (insn
&& NONJUMP_INSN_P (insn
)
3176 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3177 insn
= XVECEXP (PATTERN (insn
), 0, 0);
3183 /* Return the previous insn. If it is a SEQUENCE, return the last insn
3187 previous_insn (rtx insn
)
3191 insn
= PREV_INSN (insn
);
3192 if (insn
&& NONJUMP_INSN_P (insn
)
3193 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3194 insn
= XVECEXP (PATTERN (insn
), 0, XVECLEN (PATTERN (insn
), 0) - 1);
3200 /* Return the next insn after INSN that is not a NOTE. This routine does not
3201 look inside SEQUENCEs. */
3204 next_nonnote_insn (rtx insn
)
3208 insn
= NEXT_INSN (insn
);
3209 if (insn
== 0 || !NOTE_P (insn
))
3216 /* Return the next insn after INSN that is not a NOTE, but stop the
3217 search before we enter another basic block. This routine does not
3218 look inside SEQUENCEs. */
3221 next_nonnote_insn_bb (rtx insn
)
3225 insn
= NEXT_INSN (insn
);
3226 if (insn
== 0 || !NOTE_P (insn
))
3228 if (NOTE_INSN_BASIC_BLOCK_P (insn
))
3235 /* Return the previous insn before INSN that is not a NOTE. This routine does
3236 not look inside SEQUENCEs. */
3239 prev_nonnote_insn (rtx insn
)
3243 insn
= PREV_INSN (insn
);
3244 if (insn
== 0 || !NOTE_P (insn
))
3251 /* Return the previous insn before INSN that is not a NOTE, but stop
3252 the search before we enter another basic block. This routine does
3253 not look inside SEQUENCEs. */
3256 prev_nonnote_insn_bb (rtx insn
)
3260 insn
= PREV_INSN (insn
);
3261 if (insn
== 0 || !NOTE_P (insn
))
3263 if (NOTE_INSN_BASIC_BLOCK_P (insn
))
3270 /* Return the next insn after INSN that is not a DEBUG_INSN. This
3271 routine does not look inside SEQUENCEs. */
3274 next_nondebug_insn (rtx insn
)
3278 insn
= NEXT_INSN (insn
);
3279 if (insn
== 0 || !DEBUG_INSN_P (insn
))
3286 /* Return the previous insn before INSN that is not a DEBUG_INSN.
3287 This routine does not look inside SEQUENCEs. */
3290 prev_nondebug_insn (rtx insn
)
3294 insn
= PREV_INSN (insn
);
3295 if (insn
== 0 || !DEBUG_INSN_P (insn
))
3302 /* Return the next insn after INSN that is not a NOTE nor DEBUG_INSN.
3303 This routine does not look inside SEQUENCEs. */
3306 next_nonnote_nondebug_insn (rtx insn
)
3310 insn
= NEXT_INSN (insn
);
3311 if (insn
== 0 || (!NOTE_P (insn
) && !DEBUG_INSN_P (insn
)))
3318 /* Return the previous insn before INSN that is not a NOTE nor DEBUG_INSN.
3319 This routine does not look inside SEQUENCEs. */
3322 prev_nonnote_nondebug_insn (rtx insn
)
3326 insn
= PREV_INSN (insn
);
3327 if (insn
== 0 || (!NOTE_P (insn
) && !DEBUG_INSN_P (insn
)))
3334 /* Return the next INSN, CALL_INSN or JUMP_INSN after INSN;
3335 or 0, if there is none. This routine does not look inside
3339 next_real_insn (rtx insn
)
3343 insn
= NEXT_INSN (insn
);
3344 if (insn
== 0 || INSN_P (insn
))
3351 /* Return the last INSN, CALL_INSN or JUMP_INSN before INSN;
3352 or 0, if there is none. This routine does not look inside
3356 prev_real_insn (rtx insn
)
3360 insn
= PREV_INSN (insn
);
3361 if (insn
== 0 || INSN_P (insn
))
3368 /* Return the last CALL_INSN in the current list, or 0 if there is none.
3369 This routine does not look inside SEQUENCEs. */
3372 last_call_insn (void)
3376 for (insn
= get_last_insn ();
3377 insn
&& !CALL_P (insn
);
3378 insn
= PREV_INSN (insn
))
3384 /* Find the next insn after INSN that really does something. This routine
3385 does not look inside SEQUENCEs. After reload this also skips over
3386 standalone USE and CLOBBER insn. */
3389 active_insn_p (const_rtx insn
)
3391 return (CALL_P (insn
) || JUMP_P (insn
)
3392 || JUMP_TABLE_DATA_P (insn
) /* FIXME */
3393 || (NONJUMP_INSN_P (insn
)
3394 && (! reload_completed
3395 || (GET_CODE (PATTERN (insn
)) != USE
3396 && GET_CODE (PATTERN (insn
)) != CLOBBER
))));
3400 next_active_insn (rtx insn
)
3404 insn
= NEXT_INSN (insn
);
3405 if (insn
== 0 || active_insn_p (insn
))
3412 /* Find the last insn before INSN that really does something. This routine
3413 does not look inside SEQUENCEs. After reload this also skips over
3414 standalone USE and CLOBBER insn. */
3417 prev_active_insn (rtx insn
)
3421 insn
= PREV_INSN (insn
);
3422 if (insn
== 0 || active_insn_p (insn
))
3430 /* Return the next insn that uses CC0 after INSN, which is assumed to
3431 set it. This is the inverse of prev_cc0_setter (i.e., prev_cc0_setter
3432 applied to the result of this function should yield INSN).
3434 Normally, this is simply the next insn. However, if a REG_CC_USER note
3435 is present, it contains the insn that uses CC0.
3437 Return 0 if we can't find the insn. */
3440 next_cc0_user (rtx insn
)
3442 rtx note
= find_reg_note (insn
, REG_CC_USER
, NULL_RTX
);
3445 return XEXP (note
, 0);
3447 insn
= next_nonnote_insn (insn
);
3448 if (insn
&& NONJUMP_INSN_P (insn
) && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3449 insn
= XVECEXP (PATTERN (insn
), 0, 0);
3451 if (insn
&& INSN_P (insn
) && reg_mentioned_p (cc0_rtx
, PATTERN (insn
)))
3457 /* Find the insn that set CC0 for INSN. Unless INSN has a REG_CC_SETTER
3458 note, it is the previous insn. */
3461 prev_cc0_setter (rtx insn
)
3463 rtx note
= find_reg_note (insn
, REG_CC_SETTER
, NULL_RTX
);
3466 return XEXP (note
, 0);
3468 insn
= prev_nonnote_insn (insn
);
3469 gcc_assert (sets_cc0_p (PATTERN (insn
)));
3476 /* Find a RTX_AUTOINC class rtx which matches DATA. */
3479 find_auto_inc (rtx
*xp
, void *data
)
3482 rtx reg
= (rtx
) data
;
3484 if (GET_RTX_CLASS (GET_CODE (x
)) != RTX_AUTOINC
)
3487 switch (GET_CODE (x
))
3495 if (rtx_equal_p (reg
, XEXP (x
, 0)))
3506 /* Increment the label uses for all labels present in rtx. */
3509 mark_label_nuses (rtx x
)
3515 code
= GET_CODE (x
);
3516 if (code
== LABEL_REF
&& LABEL_P (XEXP (x
, 0)))
3517 LABEL_NUSES (XEXP (x
, 0))++;
3519 fmt
= GET_RTX_FORMAT (code
);
3520 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
3523 mark_label_nuses (XEXP (x
, i
));
3524 else if (fmt
[i
] == 'E')
3525 for (j
= XVECLEN (x
, i
) - 1; j
>= 0; j
--)
3526 mark_label_nuses (XVECEXP (x
, i
, j
));
3531 /* Try splitting insns that can be split for better scheduling.
3532 PAT is the pattern which might split.
3533 TRIAL is the insn providing PAT.
3534 LAST is nonzero if we should return the last insn of the sequence produced.
3536 If this routine succeeds in splitting, it returns the first or last
3537 replacement insn depending on the value of LAST. Otherwise, it
3538 returns TRIAL. If the insn to be returned can be split, it will be. */
3541 try_split (rtx pat
, rtx trial
, int last
)
3543 rtx before
= PREV_INSN (trial
);
3544 rtx after
= NEXT_INSN (trial
);
3545 int has_barrier
= 0;
3548 rtx insn_last
, insn
;
3550 rtx call_insn
= NULL_RTX
;
3552 /* We're not good at redistributing frame information. */
3553 if (RTX_FRAME_RELATED_P (trial
))
3556 if (any_condjump_p (trial
)
3557 && (note
= find_reg_note (trial
, REG_BR_PROB
, 0)))
3558 split_branch_probability
= XINT (note
, 0);
3559 probability
= split_branch_probability
;
3561 seq
= split_insns (pat
, trial
);
3563 split_branch_probability
= -1;
3565 /* If we are splitting a JUMP_INSN, it might be followed by a BARRIER.
3566 We may need to handle this specially. */
3567 if (after
&& BARRIER_P (after
))
3570 after
= NEXT_INSN (after
);
3576 /* Avoid infinite loop if any insn of the result matches
3577 the original pattern. */
3581 if (INSN_P (insn_last
)
3582 && rtx_equal_p (PATTERN (insn_last
), pat
))
3584 if (!NEXT_INSN (insn_last
))
3586 insn_last
= NEXT_INSN (insn_last
);
3589 /* We will be adding the new sequence to the function. The splitters
3590 may have introduced invalid RTL sharing, so unshare the sequence now. */
3591 unshare_all_rtl_in_chain (seq
);
3594 for (insn
= insn_last
; insn
; insn
= PREV_INSN (insn
))
3598 mark_jump_label (PATTERN (insn
), insn
, 0);
3600 if (probability
!= -1
3601 && any_condjump_p (insn
)
3602 && !find_reg_note (insn
, REG_BR_PROB
, 0))
3604 /* We can preserve the REG_BR_PROB notes only if exactly
3605 one jump is created, otherwise the machine description
3606 is responsible for this step using
3607 split_branch_probability variable. */
3608 gcc_assert (njumps
== 1);
3609 add_int_reg_note (insn
, REG_BR_PROB
, probability
);
3614 /* If we are splitting a CALL_INSN, look for the CALL_INSN
3615 in SEQ and copy any additional information across. */
3618 for (insn
= insn_last
; insn
; insn
= PREV_INSN (insn
))
3623 gcc_assert (call_insn
== NULL_RTX
);
3626 /* Add the old CALL_INSN_FUNCTION_USAGE to whatever the
3627 target may have explicitly specified. */
3628 p
= &CALL_INSN_FUNCTION_USAGE (insn
);
3631 *p
= CALL_INSN_FUNCTION_USAGE (trial
);
3633 /* If the old call was a sibling call, the new one must
3635 SIBLING_CALL_P (insn
) = SIBLING_CALL_P (trial
);
3637 /* If the new call is the last instruction in the sequence,
3638 it will effectively replace the old call in-situ. Otherwise
3639 we must move any following NOTE_INSN_CALL_ARG_LOCATION note
3640 so that it comes immediately after the new call. */
3641 if (NEXT_INSN (insn
))
3642 for (next
= NEXT_INSN (trial
);
3643 next
&& NOTE_P (next
);
3644 next
= NEXT_INSN (next
))
3645 if (NOTE_KIND (next
) == NOTE_INSN_CALL_ARG_LOCATION
)
3648 add_insn_after (next
, insn
, NULL
);
3654 /* Copy notes, particularly those related to the CFG. */
3655 for (note
= REG_NOTES (trial
); note
; note
= XEXP (note
, 1))
3657 switch (REG_NOTE_KIND (note
))
3660 copy_reg_eh_region_note_backward (note
, insn_last
, NULL
);
3666 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3669 add_reg_note (insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3673 case REG_NON_LOCAL_GOTO
:
3674 case REG_CROSSING_JUMP
:
3675 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3678 add_reg_note (insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3684 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3686 rtx reg
= XEXP (note
, 0);
3687 if (!FIND_REG_INC_NOTE (insn
, reg
)
3688 && for_each_rtx (&PATTERN (insn
), find_auto_inc
, reg
) > 0)
3689 add_reg_note (insn
, REG_INC
, reg
);
3695 fixup_args_size_notes (NULL_RTX
, insn_last
, INTVAL (XEXP (note
, 0)));
3699 gcc_assert (call_insn
!= NULL_RTX
);
3700 add_reg_note (call_insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3708 /* If there are LABELS inside the split insns increment the
3709 usage count so we don't delete the label. */
3713 while (insn
!= NULL_RTX
)
3715 /* JUMP_P insns have already been "marked" above. */
3716 if (NONJUMP_INSN_P (insn
))
3717 mark_label_nuses (PATTERN (insn
));
3719 insn
= PREV_INSN (insn
);
3723 tem
= emit_insn_after_setloc (seq
, trial
, INSN_LOCATION (trial
));
3725 delete_insn (trial
);
3727 emit_barrier_after (tem
);
3729 /* Recursively call try_split for each new insn created; by the
3730 time control returns here that insn will be fully split, so
3731 set LAST and continue from the insn after the one returned.
3732 We can't use next_active_insn here since AFTER may be a note.
3733 Ignore deleted insns, which can be occur if not optimizing. */
3734 for (tem
= NEXT_INSN (before
); tem
!= after
; tem
= NEXT_INSN (tem
))
3735 if (! INSN_DELETED_P (tem
) && INSN_P (tem
))
3736 tem
= try_split (PATTERN (tem
), tem
, 1);
3738 /* Return either the first or the last insn, depending on which was
3741 ? (after
? PREV_INSN (after
) : get_last_insn ())
3742 : NEXT_INSN (before
);
3745 /* Make and return an INSN rtx, initializing all its slots.
3746 Store PATTERN in the pattern slots. */
3749 make_insn_raw (rtx pattern
)
3753 insn
= rtx_alloc (INSN
);
3755 INSN_UID (insn
) = cur_insn_uid
++;
3756 PATTERN (insn
) = pattern
;
3757 INSN_CODE (insn
) = -1;
3758 REG_NOTES (insn
) = NULL
;
3759 INSN_LOCATION (insn
) = curr_insn_location ();
3760 BLOCK_FOR_INSN (insn
) = NULL
;
3762 #ifdef ENABLE_RTL_CHECKING
3765 && (returnjump_p (insn
)
3766 || (GET_CODE (insn
) == SET
3767 && SET_DEST (insn
) == pc_rtx
)))
3769 warning (0, "ICE: emit_insn used where emit_jump_insn needed:\n");
3777 /* Like `make_insn_raw' but make a DEBUG_INSN instead of an insn. */
3780 make_debug_insn_raw (rtx pattern
)
3784 insn
= rtx_alloc (DEBUG_INSN
);
3785 INSN_UID (insn
) = cur_debug_insn_uid
++;
3786 if (cur_debug_insn_uid
> MIN_NONDEBUG_INSN_UID
)
3787 INSN_UID (insn
) = cur_insn_uid
++;
3789 PATTERN (insn
) = pattern
;
3790 INSN_CODE (insn
) = -1;
3791 REG_NOTES (insn
) = NULL
;
3792 INSN_LOCATION (insn
) = curr_insn_location ();
3793 BLOCK_FOR_INSN (insn
) = NULL
;
3798 /* Like `make_insn_raw' but make a JUMP_INSN instead of an insn. */
3801 make_jump_insn_raw (rtx pattern
)
3805 insn
= rtx_alloc (JUMP_INSN
);
3806 INSN_UID (insn
) = cur_insn_uid
++;
3808 PATTERN (insn
) = pattern
;
3809 INSN_CODE (insn
) = -1;
3810 REG_NOTES (insn
) = NULL
;
3811 JUMP_LABEL (insn
) = NULL
;
3812 INSN_LOCATION (insn
) = curr_insn_location ();
3813 BLOCK_FOR_INSN (insn
) = NULL
;
3818 /* Like `make_insn_raw' but make a CALL_INSN instead of an insn. */
3821 make_call_insn_raw (rtx pattern
)
3825 insn
= rtx_alloc (CALL_INSN
);
3826 INSN_UID (insn
) = cur_insn_uid
++;
3828 PATTERN (insn
) = pattern
;
3829 INSN_CODE (insn
) = -1;
3830 REG_NOTES (insn
) = NULL
;
3831 CALL_INSN_FUNCTION_USAGE (insn
) = NULL
;
3832 INSN_LOCATION (insn
) = curr_insn_location ();
3833 BLOCK_FOR_INSN (insn
) = NULL
;
3838 /* Like `make_insn_raw' but make a NOTE instead of an insn. */
3841 make_note_raw (enum insn_note subtype
)
3843 /* Some notes are never created this way at all. These notes are
3844 only created by patching out insns. */
3845 gcc_assert (subtype
!= NOTE_INSN_DELETED_LABEL
3846 && subtype
!= NOTE_INSN_DELETED_DEBUG_LABEL
);
3848 rtx note
= rtx_alloc (NOTE
);
3849 INSN_UID (note
) = cur_insn_uid
++;
3850 NOTE_KIND (note
) = subtype
;
3851 BLOCK_FOR_INSN (note
) = NULL
;
3852 memset (&NOTE_DATA (note
), 0, sizeof (NOTE_DATA (note
)));
3856 /* Add INSN to the end of the doubly-linked list, between PREV and NEXT.
3857 INSN may be any object that can appear in the chain: INSN_P and NOTE_P objects,
3858 but also BARRIERs and JUMP_TABLE_DATAs. PREV and NEXT may be NULL. */
3861 link_insn_into_chain (rtx insn
, rtx prev
, rtx next
)
3863 PREV_INSN (insn
) = prev
;
3864 NEXT_INSN (insn
) = next
;
3867 NEXT_INSN (prev
) = insn
;
3868 if (NONJUMP_INSN_P (prev
) && GET_CODE (PATTERN (prev
)) == SEQUENCE
)
3870 rtx sequence
= PATTERN (prev
);
3871 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = insn
;
3876 PREV_INSN (next
) = insn
;
3877 if (NONJUMP_INSN_P (next
) && GET_CODE (PATTERN (next
)) == SEQUENCE
)
3878 PREV_INSN (XVECEXP (PATTERN (next
), 0, 0)) = insn
;
3881 if (NONJUMP_INSN_P (insn
) && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3883 rtx sequence
= PATTERN (insn
);
3884 PREV_INSN (XVECEXP (sequence
, 0, 0)) = prev
;
3885 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = next
;
3889 /* Add INSN to the end of the doubly-linked list.
3890 INSN may be an INSN, JUMP_INSN, CALL_INSN, CODE_LABEL, BARRIER or NOTE. */
3895 rtx prev
= get_last_insn ();
3896 link_insn_into_chain (insn
, prev
, NULL
);
3897 if (NULL
== get_insns ())
3898 set_first_insn (insn
);
3899 set_last_insn (insn
);
3902 /* Add INSN into the doubly-linked list after insn AFTER. */
3905 add_insn_after_nobb (rtx insn
, rtx after
)
3907 rtx next
= NEXT_INSN (after
);
3909 gcc_assert (!optimize
|| !INSN_DELETED_P (after
));
3911 link_insn_into_chain (insn
, after
, next
);
3915 if (get_last_insn () == after
)
3916 set_last_insn (insn
);
3919 struct sequence_stack
*stack
= seq_stack
;
3920 /* Scan all pending sequences too. */
3921 for (; stack
; stack
= stack
->next
)
3922 if (after
== stack
->last
)
3931 /* Add INSN into the doubly-linked list before insn BEFORE. */
3934 add_insn_before_nobb (rtx insn
, rtx before
)
3936 rtx prev
= PREV_INSN (before
);
3938 gcc_assert (!optimize
|| !INSN_DELETED_P (before
));
3940 link_insn_into_chain (insn
, prev
, before
);
3944 if (get_insns () == before
)
3945 set_first_insn (insn
);
3948 struct sequence_stack
*stack
= seq_stack
;
3949 /* Scan all pending sequences too. */
3950 for (; stack
; stack
= stack
->next
)
3951 if (before
== stack
->first
)
3953 stack
->first
= insn
;
3962 /* Like add_insn_after_nobb, but try to set BLOCK_FOR_INSN.
3963 If BB is NULL, an attempt is made to infer the bb from before.
3965 This and the next function should be the only functions called
3966 to insert an insn once delay slots have been filled since only
3967 they know how to update a SEQUENCE. */
3970 add_insn_after (rtx insn
, rtx after
, basic_block bb
)
3972 add_insn_after_nobb (insn
, after
);
3973 if (!BARRIER_P (after
)
3974 && !BARRIER_P (insn
)
3975 && (bb
= BLOCK_FOR_INSN (after
)))
3977 set_block_for_insn (insn
, bb
);
3979 df_insn_rescan (insn
);
3980 /* Should not happen as first in the BB is always
3981 either NOTE or LABEL. */
3982 if (BB_END (bb
) == after
3983 /* Avoid clobbering of structure when creating new BB. */
3984 && !BARRIER_P (insn
)
3985 && !NOTE_INSN_BASIC_BLOCK_P (insn
))
3990 /* Like add_insn_before_nobb, but try to set BLOCK_FOR_INSN.
3991 If BB is NULL, an attempt is made to infer the bb from before.
3993 This and the previous function should be the only functions called
3994 to insert an insn once delay slots have been filled since only
3995 they know how to update a SEQUENCE. */
3998 add_insn_before (rtx insn
, rtx before
, basic_block bb
)
4000 add_insn_before_nobb (insn
, before
);
4003 && !BARRIER_P (before
)
4004 && !BARRIER_P (insn
))
4005 bb
= BLOCK_FOR_INSN (before
);
4009 set_block_for_insn (insn
, bb
);
4011 df_insn_rescan (insn
);
4012 /* Should not happen as first in the BB is always either NOTE or
4014 gcc_assert (BB_HEAD (bb
) != insn
4015 /* Avoid clobbering of structure when creating new BB. */
4017 || NOTE_INSN_BASIC_BLOCK_P (insn
));
4021 /* Replace insn with an deleted instruction note. */
4024 set_insn_deleted (rtx insn
)
4027 df_insn_delete (insn
);
4028 PUT_CODE (insn
, NOTE
);
4029 NOTE_KIND (insn
) = NOTE_INSN_DELETED
;
4033 /* Unlink INSN from the insn chain.
4035 This function knows how to handle sequences.
4037 This function does not invalidate data flow information associated with
4038 INSN (i.e. does not call df_insn_delete). That makes this function
4039 usable for only disconnecting an insn from the chain, and re-emit it
4042 To later insert INSN elsewhere in the insn chain via add_insn and
4043 similar functions, PREV_INSN and NEXT_INSN must be nullified by
4044 the caller. Nullifying them here breaks many insn chain walks.
4046 To really delete an insn and related DF information, use delete_insn. */
4049 remove_insn (rtx insn
)
4051 rtx next
= NEXT_INSN (insn
);
4052 rtx prev
= PREV_INSN (insn
);
4057 NEXT_INSN (prev
) = next
;
4058 if (NONJUMP_INSN_P (prev
) && GET_CODE (PATTERN (prev
)) == SEQUENCE
)
4060 rtx sequence
= PATTERN (prev
);
4061 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = next
;
4064 else if (get_insns () == insn
)
4067 PREV_INSN (next
) = NULL
;
4068 set_first_insn (next
);
4072 struct sequence_stack
*stack
= seq_stack
;
4073 /* Scan all pending sequences too. */
4074 for (; stack
; stack
= stack
->next
)
4075 if (insn
== stack
->first
)
4077 stack
->first
= next
;
4086 PREV_INSN (next
) = prev
;
4087 if (NONJUMP_INSN_P (next
) && GET_CODE (PATTERN (next
)) == SEQUENCE
)
4088 PREV_INSN (XVECEXP (PATTERN (next
), 0, 0)) = prev
;
4090 else if (get_last_insn () == insn
)
4091 set_last_insn (prev
);
4094 struct sequence_stack
*stack
= seq_stack
;
4095 /* Scan all pending sequences too. */
4096 for (; stack
; stack
= stack
->next
)
4097 if (insn
== stack
->last
)
4106 /* Fix up basic block boundaries, if necessary. */
4107 if (!BARRIER_P (insn
)
4108 && (bb
= BLOCK_FOR_INSN (insn
)))
4110 if (BB_HEAD (bb
) == insn
)
4112 /* Never ever delete the basic block note without deleting whole
4114 gcc_assert (!NOTE_P (insn
));
4115 BB_HEAD (bb
) = next
;
4117 if (BB_END (bb
) == insn
)
4122 /* Append CALL_FUSAGE to the CALL_INSN_FUNCTION_USAGE for CALL_INSN. */
4125 add_function_usage_to (rtx call_insn
, rtx call_fusage
)
4127 gcc_assert (call_insn
&& CALL_P (call_insn
));
4129 /* Put the register usage information on the CALL. If there is already
4130 some usage information, put ours at the end. */
4131 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
4135 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
4136 link
= XEXP (link
, 1))
4139 XEXP (link
, 1) = call_fusage
;
4142 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
4145 /* Delete all insns made since FROM.
4146 FROM becomes the new last instruction. */
4149 delete_insns_since (rtx from
)
4154 NEXT_INSN (from
) = 0;
4155 set_last_insn (from
);
4158 /* This function is deprecated, please use sequences instead.
4160 Move a consecutive bunch of insns to a different place in the chain.
4161 The insns to be moved are those between FROM and TO.
4162 They are moved to a new position after the insn AFTER.
4163 AFTER must not be FROM or TO or any insn in between.
4165 This function does not know about SEQUENCEs and hence should not be
4166 called after delay-slot filling has been done. */
4169 reorder_insns_nobb (rtx from
, rtx to
, rtx after
)
4171 #ifdef ENABLE_CHECKING
4173 for (x
= from
; x
!= to
; x
= NEXT_INSN (x
))
4174 gcc_assert (after
!= x
);
4175 gcc_assert (after
!= to
);
4178 /* Splice this bunch out of where it is now. */
4179 if (PREV_INSN (from
))
4180 NEXT_INSN (PREV_INSN (from
)) = NEXT_INSN (to
);
4182 PREV_INSN (NEXT_INSN (to
)) = PREV_INSN (from
);
4183 if (get_last_insn () == to
)
4184 set_last_insn (PREV_INSN (from
));
4185 if (get_insns () == from
)
4186 set_first_insn (NEXT_INSN (to
));
4188 /* Make the new neighbors point to it and it to them. */
4189 if (NEXT_INSN (after
))
4190 PREV_INSN (NEXT_INSN (after
)) = to
;
4192 NEXT_INSN (to
) = NEXT_INSN (after
);
4193 PREV_INSN (from
) = after
;
4194 NEXT_INSN (after
) = from
;
4195 if (after
== get_last_insn ())
4199 /* Same as function above, but take care to update BB boundaries. */
4201 reorder_insns (rtx from
, rtx to
, rtx after
)
4203 rtx prev
= PREV_INSN (from
);
4204 basic_block bb
, bb2
;
4206 reorder_insns_nobb (from
, to
, after
);
4208 if (!BARRIER_P (after
)
4209 && (bb
= BLOCK_FOR_INSN (after
)))
4212 df_set_bb_dirty (bb
);
4214 if (!BARRIER_P (from
)
4215 && (bb2
= BLOCK_FOR_INSN (from
)))
4217 if (BB_END (bb2
) == to
)
4218 BB_END (bb2
) = prev
;
4219 df_set_bb_dirty (bb2
);
4222 if (BB_END (bb
) == after
)
4225 for (x
= from
; x
!= NEXT_INSN (to
); x
= NEXT_INSN (x
))
4227 df_insn_change_bb (x
, bb
);
4232 /* Emit insn(s) of given code and pattern
4233 at a specified place within the doubly-linked list.
4235 All of the emit_foo global entry points accept an object
4236 X which is either an insn list or a PATTERN of a single
4239 There are thus a few canonical ways to generate code and
4240 emit it at a specific place in the instruction stream. For
4241 example, consider the instruction named SPOT and the fact that
4242 we would like to emit some instructions before SPOT. We might
4246 ... emit the new instructions ...
4247 insns_head = get_insns ();
4250 emit_insn_before (insns_head, SPOT);
4252 It used to be common to generate SEQUENCE rtl instead, but that
4253 is a relic of the past which no longer occurs. The reason is that
4254 SEQUENCE rtl results in much fragmented RTL memory since the SEQUENCE
4255 generated would almost certainly die right after it was created. */
4258 emit_pattern_before_noloc (rtx x
, rtx before
, rtx last
, basic_block bb
,
4259 rtx (*make_raw
) (rtx
))
4263 gcc_assert (before
);
4268 switch (GET_CODE (x
))
4280 rtx next
= NEXT_INSN (insn
);
4281 add_insn_before (insn
, before
, bb
);
4287 #ifdef ENABLE_RTL_CHECKING
4294 last
= (*make_raw
) (x
);
4295 add_insn_before (last
, before
, bb
);
4302 /* Make X be output before the instruction BEFORE. */
4305 emit_insn_before_noloc (rtx x
, rtx before
, basic_block bb
)
4307 return emit_pattern_before_noloc (x
, before
, before
, bb
, make_insn_raw
);
4310 /* Make an instruction with body X and code JUMP_INSN
4311 and output it before the instruction BEFORE. */
4314 emit_jump_insn_before_noloc (rtx x
, rtx before
)
4316 return emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4317 make_jump_insn_raw
);
4320 /* Make an instruction with body X and code CALL_INSN
4321 and output it before the instruction BEFORE. */
4324 emit_call_insn_before_noloc (rtx x
, rtx before
)
4326 return emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4327 make_call_insn_raw
);
4330 /* Make an instruction with body X and code DEBUG_INSN
4331 and output it before the instruction BEFORE. */
4334 emit_debug_insn_before_noloc (rtx x
, rtx before
)
4336 return emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4337 make_debug_insn_raw
);
4340 /* Make an insn of code BARRIER
4341 and output it before the insn BEFORE. */
4344 emit_barrier_before (rtx before
)
4346 rtx insn
= rtx_alloc (BARRIER
);
4348 INSN_UID (insn
) = cur_insn_uid
++;
4350 add_insn_before (insn
, before
, NULL
);
4354 /* Emit the label LABEL before the insn BEFORE. */
4357 emit_label_before (rtx label
, rtx before
)
4359 gcc_checking_assert (INSN_UID (label
) == 0);
4360 INSN_UID (label
) = cur_insn_uid
++;
4361 add_insn_before (label
, before
, NULL
);
4365 /* Helper for emit_insn_after, handles lists of instructions
4369 emit_insn_after_1 (rtx first
, rtx after
, basic_block bb
)
4373 if (!bb
&& !BARRIER_P (after
))
4374 bb
= BLOCK_FOR_INSN (after
);
4378 df_set_bb_dirty (bb
);
4379 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4380 if (!BARRIER_P (last
))
4382 set_block_for_insn (last
, bb
);
4383 df_insn_rescan (last
);
4385 if (!BARRIER_P (last
))
4387 set_block_for_insn (last
, bb
);
4388 df_insn_rescan (last
);
4390 if (BB_END (bb
) == after
)
4394 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4397 after_after
= NEXT_INSN (after
);
4399 NEXT_INSN (after
) = first
;
4400 PREV_INSN (first
) = after
;
4401 NEXT_INSN (last
) = after_after
;
4403 PREV_INSN (after_after
) = last
;
4405 if (after
== get_last_insn ())
4406 set_last_insn (last
);
4412 emit_pattern_after_noloc (rtx x
, rtx after
, basic_block bb
,
4413 rtx (*make_raw
)(rtx
))
4422 switch (GET_CODE (x
))
4431 last
= emit_insn_after_1 (x
, after
, bb
);
4434 #ifdef ENABLE_RTL_CHECKING
4441 last
= (*make_raw
) (x
);
4442 add_insn_after (last
, after
, bb
);
4449 /* Make X be output after the insn AFTER and set the BB of insn. If
4450 BB is NULL, an attempt is made to infer the BB from AFTER. */
4453 emit_insn_after_noloc (rtx x
, rtx after
, basic_block bb
)
4455 return emit_pattern_after_noloc (x
, after
, bb
, make_insn_raw
);
4459 /* Make an insn of code JUMP_INSN with body X
4460 and output it after the insn AFTER. */
4463 emit_jump_insn_after_noloc (rtx x
, rtx after
)
4465 return emit_pattern_after_noloc (x
, after
, NULL
, make_jump_insn_raw
);
4468 /* Make an instruction with body X and code CALL_INSN
4469 and output it after the instruction AFTER. */
4472 emit_call_insn_after_noloc (rtx x
, rtx after
)
4474 return emit_pattern_after_noloc (x
, after
, NULL
, make_call_insn_raw
);
4477 /* Make an instruction with body X and code CALL_INSN
4478 and output it after the instruction AFTER. */
4481 emit_debug_insn_after_noloc (rtx x
, rtx after
)
4483 return emit_pattern_after_noloc (x
, after
, NULL
, make_debug_insn_raw
);
4486 /* Make an insn of code BARRIER
4487 and output it after the insn AFTER. */
4490 emit_barrier_after (rtx after
)
4492 rtx insn
= rtx_alloc (BARRIER
);
4494 INSN_UID (insn
) = cur_insn_uid
++;
4496 add_insn_after (insn
, after
, NULL
);
4500 /* Emit the label LABEL after the insn AFTER. */
4503 emit_label_after (rtx label
, rtx after
)
4505 gcc_checking_assert (INSN_UID (label
) == 0);
4506 INSN_UID (label
) = cur_insn_uid
++;
4507 add_insn_after (label
, after
, NULL
);
4511 /* Notes require a bit of special handling: Some notes need to have their
4512 BLOCK_FOR_INSN set, others should never have it set, and some should
4513 have it set or clear depending on the context. */
4515 /* Return true iff a note of kind SUBTYPE should be emitted with routines
4516 that never set BLOCK_FOR_INSN on NOTE. BB_BOUNDARY is true if the
4517 caller is asked to emit a note before BB_HEAD, or after BB_END. */
4520 note_outside_basic_block_p (enum insn_note subtype
, bool on_bb_boundary_p
)
4524 /* NOTE_INSN_SWITCH_TEXT_SECTIONS only appears between basic blocks. */
4525 case NOTE_INSN_SWITCH_TEXT_SECTIONS
:
4528 /* Notes for var tracking and EH region markers can appear between or
4529 inside basic blocks. If the caller is emitting on the basic block
4530 boundary, do not set BLOCK_FOR_INSN on the new note. */
4531 case NOTE_INSN_VAR_LOCATION
:
4532 case NOTE_INSN_CALL_ARG_LOCATION
:
4533 case NOTE_INSN_EH_REGION_BEG
:
4534 case NOTE_INSN_EH_REGION_END
:
4535 return on_bb_boundary_p
;
4537 /* Otherwise, BLOCK_FOR_INSN must be set. */
4543 /* Emit a note of subtype SUBTYPE after the insn AFTER. */
4546 emit_note_after (enum insn_note subtype
, rtx after
)
4548 rtx note
= make_note_raw (subtype
);
4549 basic_block bb
= BARRIER_P (after
) ? NULL
: BLOCK_FOR_INSN (after
);
4550 bool on_bb_boundary_p
= (bb
!= NULL
&& BB_END (bb
) == after
);
4552 if (note_outside_basic_block_p (subtype
, on_bb_boundary_p
))
4553 add_insn_after_nobb (note
, after
);
4555 add_insn_after (note
, after
, bb
);
4559 /* Emit a note of subtype SUBTYPE before the insn BEFORE. */
4562 emit_note_before (enum insn_note subtype
, rtx before
)
4564 rtx note
= make_note_raw (subtype
);
4565 basic_block bb
= BARRIER_P (before
) ? NULL
: BLOCK_FOR_INSN (before
);
4566 bool on_bb_boundary_p
= (bb
!= NULL
&& BB_HEAD (bb
) == before
);
4568 if (note_outside_basic_block_p (subtype
, on_bb_boundary_p
))
4569 add_insn_before_nobb (note
, before
);
4571 add_insn_before (note
, before
, bb
);
4575 /* Insert PATTERN after AFTER, setting its INSN_LOCATION to LOC.
4576 MAKE_RAW indicates how to turn PATTERN into a real insn. */
4579 emit_pattern_after_setloc (rtx pattern
, rtx after
, int loc
,
4580 rtx (*make_raw
) (rtx
))
4582 rtx last
= emit_pattern_after_noloc (pattern
, after
, NULL
, make_raw
);
4584 if (pattern
== NULL_RTX
|| !loc
)
4587 after
= NEXT_INSN (after
);
4590 if (active_insn_p (after
) && !INSN_LOCATION (after
))
4591 INSN_LOCATION (after
) = loc
;
4594 after
= NEXT_INSN (after
);
4599 /* Insert PATTERN after AFTER. MAKE_RAW indicates how to turn PATTERN
4600 into a real insn. SKIP_DEBUG_INSNS indicates whether to insert after
4604 emit_pattern_after (rtx pattern
, rtx after
, bool skip_debug_insns
,
4605 rtx (*make_raw
) (rtx
))
4609 if (skip_debug_insns
)
4610 while (DEBUG_INSN_P (prev
))
4611 prev
= PREV_INSN (prev
);
4614 return emit_pattern_after_setloc (pattern
, after
, INSN_LOCATION (prev
),
4617 return emit_pattern_after_noloc (pattern
, after
, NULL
, make_raw
);
4620 /* Like emit_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4622 emit_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4624 return emit_pattern_after_setloc (pattern
, after
, loc
, make_insn_raw
);
4627 /* Like emit_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4629 emit_insn_after (rtx pattern
, rtx after
)
4631 return emit_pattern_after (pattern
, after
, true, make_insn_raw
);
4634 /* Like emit_jump_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4636 emit_jump_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4638 return emit_pattern_after_setloc (pattern
, after
, loc
, make_jump_insn_raw
);
4641 /* Like emit_jump_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4643 emit_jump_insn_after (rtx pattern
, rtx after
)
4645 return emit_pattern_after (pattern
, after
, true, make_jump_insn_raw
);
4648 /* Like emit_call_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4650 emit_call_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4652 return emit_pattern_after_setloc (pattern
, after
, loc
, make_call_insn_raw
);
4655 /* Like emit_call_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4657 emit_call_insn_after (rtx pattern
, rtx after
)
4659 return emit_pattern_after (pattern
, after
, true, make_call_insn_raw
);
4662 /* Like emit_debug_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4664 emit_debug_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4666 return emit_pattern_after_setloc (pattern
, after
, loc
, make_debug_insn_raw
);
4669 /* Like emit_debug_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4671 emit_debug_insn_after (rtx pattern
, rtx after
)
4673 return emit_pattern_after (pattern
, after
, false, make_debug_insn_raw
);
4676 /* Insert PATTERN before BEFORE, setting its INSN_LOCATION to LOC.
4677 MAKE_RAW indicates how to turn PATTERN into a real insn. INSNP
4678 indicates if PATTERN is meant for an INSN as opposed to a JUMP_INSN,
4682 emit_pattern_before_setloc (rtx pattern
, rtx before
, int loc
, bool insnp
,
4683 rtx (*make_raw
) (rtx
))
4685 rtx first
= PREV_INSN (before
);
4686 rtx last
= emit_pattern_before_noloc (pattern
, before
,
4687 insnp
? before
: NULL_RTX
,
4690 if (pattern
== NULL_RTX
|| !loc
)
4694 first
= get_insns ();
4696 first
= NEXT_INSN (first
);
4699 if (active_insn_p (first
) && !INSN_LOCATION (first
))
4700 INSN_LOCATION (first
) = loc
;
4703 first
= NEXT_INSN (first
);
4708 /* Insert PATTERN before BEFORE. MAKE_RAW indicates how to turn PATTERN
4709 into a real insn. SKIP_DEBUG_INSNS indicates whether to insert
4710 before any DEBUG_INSNs. INSNP indicates if PATTERN is meant for an
4711 INSN as opposed to a JUMP_INSN, CALL_INSN, etc. */
4714 emit_pattern_before (rtx pattern
, rtx before
, bool skip_debug_insns
,
4715 bool insnp
, rtx (*make_raw
) (rtx
))
4719 if (skip_debug_insns
)
4720 while (DEBUG_INSN_P (next
))
4721 next
= PREV_INSN (next
);
4724 return emit_pattern_before_setloc (pattern
, before
, INSN_LOCATION (next
),
4727 return emit_pattern_before_noloc (pattern
, before
,
4728 insnp
? before
: NULL_RTX
,
4732 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4734 emit_insn_before_setloc (rtx pattern
, rtx before
, int loc
)
4736 return emit_pattern_before_setloc (pattern
, before
, loc
, true,
4740 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to BEFORE. */
4742 emit_insn_before (rtx pattern
, rtx before
)
4744 return emit_pattern_before (pattern
, before
, true, true, make_insn_raw
);
4747 /* like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4749 emit_jump_insn_before_setloc (rtx pattern
, rtx before
, int loc
)
4751 return emit_pattern_before_setloc (pattern
, before
, loc
, false,
4752 make_jump_insn_raw
);
4755 /* Like emit_jump_insn_before_noloc, but set INSN_LOCATION according to BEFORE. */
4757 emit_jump_insn_before (rtx pattern
, rtx before
)
4759 return emit_pattern_before (pattern
, before
, true, false,
4760 make_jump_insn_raw
);
4763 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4765 emit_call_insn_before_setloc (rtx pattern
, rtx before
, int loc
)
4767 return emit_pattern_before_setloc (pattern
, before
, loc
, false,
4768 make_call_insn_raw
);
4771 /* Like emit_call_insn_before_noloc,
4772 but set insn_location according to BEFORE. */
4774 emit_call_insn_before (rtx pattern
, rtx before
)
4776 return emit_pattern_before (pattern
, before
, true, false,
4777 make_call_insn_raw
);
4780 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4782 emit_debug_insn_before_setloc (rtx pattern
, rtx before
, int loc
)
4784 return emit_pattern_before_setloc (pattern
, before
, loc
, false,
4785 make_debug_insn_raw
);
4788 /* Like emit_debug_insn_before_noloc,
4789 but set insn_location according to BEFORE. */
4791 emit_debug_insn_before (rtx pattern
, rtx before
)
4793 return emit_pattern_before (pattern
, before
, false, false,
4794 make_debug_insn_raw
);
4797 /* Take X and emit it at the end of the doubly-linked
4800 Returns the last insn emitted. */
4805 rtx last
= get_last_insn ();
4811 switch (GET_CODE (x
))
4823 rtx next
= NEXT_INSN (insn
);
4830 #ifdef ENABLE_RTL_CHECKING
4831 case JUMP_TABLE_DATA
:
4838 last
= make_insn_raw (x
);
4846 /* Make an insn of code DEBUG_INSN with pattern X
4847 and add it to the end of the doubly-linked list. */
4850 emit_debug_insn (rtx x
)
4852 rtx last
= get_last_insn ();
4858 switch (GET_CODE (x
))
4870 rtx next
= NEXT_INSN (insn
);
4877 #ifdef ENABLE_RTL_CHECKING
4878 case JUMP_TABLE_DATA
:
4885 last
= make_debug_insn_raw (x
);
4893 /* Make an insn of code JUMP_INSN with pattern X
4894 and add it to the end of the doubly-linked list. */
4897 emit_jump_insn (rtx x
)
4899 rtx last
= NULL_RTX
, insn
;
4901 switch (GET_CODE (x
))
4913 rtx next
= NEXT_INSN (insn
);
4920 #ifdef ENABLE_RTL_CHECKING
4921 case JUMP_TABLE_DATA
:
4928 last
= make_jump_insn_raw (x
);
4936 /* Make an insn of code CALL_INSN with pattern X
4937 and add it to the end of the doubly-linked list. */
4940 emit_call_insn (rtx x
)
4944 switch (GET_CODE (x
))
4953 insn
= emit_insn (x
);
4956 #ifdef ENABLE_RTL_CHECKING
4958 case JUMP_TABLE_DATA
:
4964 insn
= make_call_insn_raw (x
);
4972 /* Add the label LABEL to the end of the doubly-linked list. */
4975 emit_label (rtx label
)
4977 gcc_checking_assert (INSN_UID (label
) == 0);
4978 INSN_UID (label
) = cur_insn_uid
++;
4983 /* Make an insn of code JUMP_TABLE_DATA
4984 and add it to the end of the doubly-linked list. */
4987 emit_jump_table_data (rtx table
)
4989 rtx jump_table_data
= rtx_alloc (JUMP_TABLE_DATA
);
4990 INSN_UID (jump_table_data
) = cur_insn_uid
++;
4991 PATTERN (jump_table_data
) = table
;
4992 BLOCK_FOR_INSN (jump_table_data
) = NULL
;
4993 add_insn (jump_table_data
);
4994 return jump_table_data
;
4997 /* Make an insn of code BARRIER
4998 and add it to the end of the doubly-linked list. */
5003 rtx barrier
= rtx_alloc (BARRIER
);
5004 INSN_UID (barrier
) = cur_insn_uid
++;
5009 /* Emit a copy of note ORIG. */
5012 emit_note_copy (rtx orig
)
5014 enum insn_note kind
= (enum insn_note
) NOTE_KIND (orig
);
5015 rtx note
= make_note_raw (kind
);
5016 NOTE_DATA (note
) = NOTE_DATA (orig
);
5021 /* Make an insn of code NOTE or type NOTE_NO
5022 and add it to the end of the doubly-linked list. */
5025 emit_note (enum insn_note kind
)
5027 rtx note
= make_note_raw (kind
);
5032 /* Emit a clobber of lvalue X. */
5035 emit_clobber (rtx x
)
5037 /* CONCATs should not appear in the insn stream. */
5038 if (GET_CODE (x
) == CONCAT
)
5040 emit_clobber (XEXP (x
, 0));
5041 return emit_clobber (XEXP (x
, 1));
5043 return emit_insn (gen_rtx_CLOBBER (VOIDmode
, x
));
5046 /* Return a sequence of insns to clobber lvalue X. */
5060 /* Emit a use of rvalue X. */
5065 /* CONCATs should not appear in the insn stream. */
5066 if (GET_CODE (x
) == CONCAT
)
5068 emit_use (XEXP (x
, 0));
5069 return emit_use (XEXP (x
, 1));
5071 return emit_insn (gen_rtx_USE (VOIDmode
, x
));
5074 /* Return a sequence of insns to use rvalue X. */
5088 /* Place a note of KIND on insn INSN with DATUM as the datum. If a
5089 note of this type already exists, remove it first. */
5092 set_unique_reg_note (rtx insn
, enum reg_note kind
, rtx datum
)
5094 rtx note
= find_reg_note (insn
, kind
, NULL_RTX
);
5100 /* Don't add REG_EQUAL/REG_EQUIV notes if the insn
5101 has multiple sets (some callers assume single_set
5102 means the insn only has one set, when in fact it
5103 means the insn only has one * useful * set). */
5104 if (GET_CODE (PATTERN (insn
)) == PARALLEL
&& multiple_sets (insn
))
5110 /* Don't add ASM_OPERAND REG_EQUAL/REG_EQUIV notes.
5111 It serves no useful purpose and breaks eliminate_regs. */
5112 if (GET_CODE (datum
) == ASM_OPERANDS
)
5117 XEXP (note
, 0) = datum
;
5118 df_notes_rescan (insn
);
5126 XEXP (note
, 0) = datum
;
5132 add_reg_note (insn
, kind
, datum
);
5138 df_notes_rescan (insn
);
5144 return REG_NOTES (insn
);
5147 /* Like set_unique_reg_note, but don't do anything unless INSN sets DST. */
5149 set_dst_reg_note (rtx insn
, enum reg_note kind
, rtx datum
, rtx dst
)
5151 rtx set
= single_set (insn
);
5153 if (set
&& SET_DEST (set
) == dst
)
5154 return set_unique_reg_note (insn
, kind
, datum
);
5158 /* Return an indication of which type of insn should have X as a body.
5159 The value is CODE_LABEL, INSN, CALL_INSN or JUMP_INSN. */
5161 static enum rtx_code
5162 classify_insn (rtx x
)
5166 if (GET_CODE (x
) == CALL
)
5168 if (ANY_RETURN_P (x
))
5170 if (GET_CODE (x
) == SET
)
5172 if (SET_DEST (x
) == pc_rtx
)
5174 else if (GET_CODE (SET_SRC (x
)) == CALL
)
5179 if (GET_CODE (x
) == PARALLEL
)
5182 for (j
= XVECLEN (x
, 0) - 1; j
>= 0; j
--)
5183 if (GET_CODE (XVECEXP (x
, 0, j
)) == CALL
)
5185 else if (GET_CODE (XVECEXP (x
, 0, j
)) == SET
5186 && SET_DEST (XVECEXP (x
, 0, j
)) == pc_rtx
)
5188 else if (GET_CODE (XVECEXP (x
, 0, j
)) == SET
5189 && GET_CODE (SET_SRC (XVECEXP (x
, 0, j
))) == CALL
)
5195 /* Emit the rtl pattern X as an appropriate kind of insn.
5196 If X is a label, it is simply added into the insn chain. */
5201 enum rtx_code code
= classify_insn (x
);
5206 return emit_label (x
);
5208 return emit_insn (x
);
5211 rtx insn
= emit_jump_insn (x
);
5212 if (any_uncondjump_p (insn
) || GET_CODE (x
) == RETURN
)
5213 return emit_barrier ();
5217 return emit_call_insn (x
);
5219 return emit_debug_insn (x
);
5225 /* Space for free sequence stack entries. */
5226 static GTY ((deletable
)) struct sequence_stack
*free_sequence_stack
;
5228 /* Begin emitting insns to a sequence. If this sequence will contain
5229 something that might cause the compiler to pop arguments to function
5230 calls (because those pops have previously been deferred; see
5231 INHIBIT_DEFER_POP for more details), use do_pending_stack_adjust
5232 before calling this function. That will ensure that the deferred
5233 pops are not accidentally emitted in the middle of this sequence. */
5236 start_sequence (void)
5238 struct sequence_stack
*tem
;
5240 if (free_sequence_stack
!= NULL
)
5242 tem
= free_sequence_stack
;
5243 free_sequence_stack
= tem
->next
;
5246 tem
= ggc_alloc_sequence_stack ();
5248 tem
->next
= seq_stack
;
5249 tem
->first
= get_insns ();
5250 tem
->last
= get_last_insn ();
5258 /* Set up the insn chain starting with FIRST as the current sequence,
5259 saving the previously current one. See the documentation for
5260 start_sequence for more information about how to use this function. */
5263 push_to_sequence (rtx first
)
5269 for (last
= first
; last
&& NEXT_INSN (last
); last
= NEXT_INSN (last
))
5272 set_first_insn (first
);
5273 set_last_insn (last
);
5276 /* Like push_to_sequence, but take the last insn as an argument to avoid
5277 looping through the list. */
5280 push_to_sequence2 (rtx first
, rtx last
)
5284 set_first_insn (first
);
5285 set_last_insn (last
);
5288 /* Set up the outer-level insn chain
5289 as the current sequence, saving the previously current one. */
5292 push_topmost_sequence (void)
5294 struct sequence_stack
*stack
, *top
= NULL
;
5298 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
5301 set_first_insn (top
->first
);
5302 set_last_insn (top
->last
);
5305 /* After emitting to the outer-level insn chain, update the outer-level
5306 insn chain, and restore the previous saved state. */
5309 pop_topmost_sequence (void)
5311 struct sequence_stack
*stack
, *top
= NULL
;
5313 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
5316 top
->first
= get_insns ();
5317 top
->last
= get_last_insn ();
5322 /* After emitting to a sequence, restore previous saved state.
5324 To get the contents of the sequence just made, you must call
5325 `get_insns' *before* calling here.
5327 If the compiler might have deferred popping arguments while
5328 generating this sequence, and this sequence will not be immediately
5329 inserted into the instruction stream, use do_pending_stack_adjust
5330 before calling get_insns. That will ensure that the deferred
5331 pops are inserted into this sequence, and not into some random
5332 location in the instruction stream. See INHIBIT_DEFER_POP for more
5333 information about deferred popping of arguments. */
5338 struct sequence_stack
*tem
= seq_stack
;
5340 set_first_insn (tem
->first
);
5341 set_last_insn (tem
->last
);
5342 seq_stack
= tem
->next
;
5344 memset (tem
, 0, sizeof (*tem
));
5345 tem
->next
= free_sequence_stack
;
5346 free_sequence_stack
= tem
;
5349 /* Return 1 if currently emitting into a sequence. */
5352 in_sequence_p (void)
5354 return seq_stack
!= 0;
5357 /* Put the various virtual registers into REGNO_REG_RTX. */
5360 init_virtual_regs (void)
5362 regno_reg_rtx
[VIRTUAL_INCOMING_ARGS_REGNUM
] = virtual_incoming_args_rtx
;
5363 regno_reg_rtx
[VIRTUAL_STACK_VARS_REGNUM
] = virtual_stack_vars_rtx
;
5364 regno_reg_rtx
[VIRTUAL_STACK_DYNAMIC_REGNUM
] = virtual_stack_dynamic_rtx
;
5365 regno_reg_rtx
[VIRTUAL_OUTGOING_ARGS_REGNUM
] = virtual_outgoing_args_rtx
;
5366 regno_reg_rtx
[VIRTUAL_CFA_REGNUM
] = virtual_cfa_rtx
;
5367 regno_reg_rtx
[VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM
]
5368 = virtual_preferred_stack_boundary_rtx
;
5372 /* Used by copy_insn_1 to avoid copying SCRATCHes more than once. */
5373 static rtx copy_insn_scratch_in
[MAX_RECOG_OPERANDS
];
5374 static rtx copy_insn_scratch_out
[MAX_RECOG_OPERANDS
];
5375 static int copy_insn_n_scratches
;
5377 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5378 copied an ASM_OPERANDS.
5379 In that case, it is the original input-operand vector. */
5380 static rtvec orig_asm_operands_vector
;
5382 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5383 copied an ASM_OPERANDS.
5384 In that case, it is the copied input-operand vector. */
5385 static rtvec copy_asm_operands_vector
;
5387 /* Likewise for the constraints vector. */
5388 static rtvec orig_asm_constraints_vector
;
5389 static rtvec copy_asm_constraints_vector
;
5391 /* Recursively create a new copy of an rtx for copy_insn.
5392 This function differs from copy_rtx in that it handles SCRATCHes and
5393 ASM_OPERANDs properly.
5394 Normally, this function is not used directly; use copy_insn as front end.
5395 However, you could first copy an insn pattern with copy_insn and then use
5396 this function afterwards to properly copy any REG_NOTEs containing
5400 copy_insn_1 (rtx orig
)
5405 const char *format_ptr
;
5410 code
= GET_CODE (orig
);
5425 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
5426 clobbers or clobbers of hard registers that originated as pseudos.
5427 This is needed to allow safe register renaming. */
5428 if (REG_P (XEXP (orig
, 0)) && REGNO (XEXP (orig
, 0)) < FIRST_PSEUDO_REGISTER
5429 && ORIGINAL_REGNO (XEXP (orig
, 0)) == REGNO (XEXP (orig
, 0)))
5434 for (i
= 0; i
< copy_insn_n_scratches
; i
++)
5435 if (copy_insn_scratch_in
[i
] == orig
)
5436 return copy_insn_scratch_out
[i
];
5440 if (shared_const_p (orig
))
5444 /* A MEM with a constant address is not sharable. The problem is that
5445 the constant address may need to be reloaded. If the mem is shared,
5446 then reloading one copy of this mem will cause all copies to appear
5447 to have been reloaded. */
5453 /* Copy the various flags, fields, and other information. We assume
5454 that all fields need copying, and then clear the fields that should
5455 not be copied. That is the sensible default behavior, and forces
5456 us to explicitly document why we are *not* copying a flag. */
5457 copy
= shallow_copy_rtx (orig
);
5459 /* We do not copy the USED flag, which is used as a mark bit during
5460 walks over the RTL. */
5461 RTX_FLAG (copy
, used
) = 0;
5463 /* We do not copy JUMP, CALL, or FRAME_RELATED for INSNs. */
5466 RTX_FLAG (copy
, jump
) = 0;
5467 RTX_FLAG (copy
, call
) = 0;
5468 RTX_FLAG (copy
, frame_related
) = 0;
5471 format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
5473 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
5474 switch (*format_ptr
++)
5477 if (XEXP (orig
, i
) != NULL
)
5478 XEXP (copy
, i
) = copy_insn_1 (XEXP (orig
, i
));
5483 if (XVEC (orig
, i
) == orig_asm_constraints_vector
)
5484 XVEC (copy
, i
) = copy_asm_constraints_vector
;
5485 else if (XVEC (orig
, i
) == orig_asm_operands_vector
)
5486 XVEC (copy
, i
) = copy_asm_operands_vector
;
5487 else if (XVEC (orig
, i
) != NULL
)
5489 XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
5490 for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
5491 XVECEXP (copy
, i
, j
) = copy_insn_1 (XVECEXP (orig
, i
, j
));
5502 /* These are left unchanged. */
5509 if (code
== SCRATCH
)
5511 i
= copy_insn_n_scratches
++;
5512 gcc_assert (i
< MAX_RECOG_OPERANDS
);
5513 copy_insn_scratch_in
[i
] = orig
;
5514 copy_insn_scratch_out
[i
] = copy
;
5516 else if (code
== ASM_OPERANDS
)
5518 orig_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (orig
);
5519 copy_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (copy
);
5520 orig_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (orig
);
5521 copy_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (copy
);
5527 /* Create a new copy of an rtx.
5528 This function differs from copy_rtx in that it handles SCRATCHes and
5529 ASM_OPERANDs properly.
5530 INSN doesn't really have to be a full INSN; it could be just the
5533 copy_insn (rtx insn
)
5535 copy_insn_n_scratches
= 0;
5536 orig_asm_operands_vector
= 0;
5537 orig_asm_constraints_vector
= 0;
5538 copy_asm_operands_vector
= 0;
5539 copy_asm_constraints_vector
= 0;
5540 return copy_insn_1 (insn
);
5543 /* Return a copy of INSN that can be used in a SEQUENCE delay slot,
5544 on that assumption that INSN itself remains in its original place. */
5547 copy_delay_slot_insn (rtx insn
)
5549 /* Copy INSN with its rtx_code, all its notes, location etc. */
5550 insn
= copy_rtx (insn
);
5551 INSN_UID (insn
) = cur_insn_uid
++;
5555 /* Initialize data structures and variables in this file
5556 before generating rtl for each function. */
5561 set_first_insn (NULL
);
5562 set_last_insn (NULL
);
5563 if (MIN_NONDEBUG_INSN_UID
)
5564 cur_insn_uid
= MIN_NONDEBUG_INSN_UID
;
5567 cur_debug_insn_uid
= 1;
5568 reg_rtx_no
= LAST_VIRTUAL_REGISTER
+ 1;
5569 first_label_num
= label_num
;
5572 /* Init the tables that describe all the pseudo regs. */
5574 crtl
->emit
.regno_pointer_align_length
= LAST_VIRTUAL_REGISTER
+ 101;
5576 crtl
->emit
.regno_pointer_align
5577 = XCNEWVEC (unsigned char, crtl
->emit
.regno_pointer_align_length
);
5579 regno_reg_rtx
= ggc_alloc_vec_rtx (crtl
->emit
.regno_pointer_align_length
);
5581 /* Put copies of all the hard registers into regno_reg_rtx. */
5582 memcpy (regno_reg_rtx
,
5583 initial_regno_reg_rtx
,
5584 FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
5586 /* Put copies of all the virtual register rtx into regno_reg_rtx. */
5587 init_virtual_regs ();
5589 /* Indicate that the virtual registers and stack locations are
5591 REG_POINTER (stack_pointer_rtx
) = 1;
5592 REG_POINTER (frame_pointer_rtx
) = 1;
5593 REG_POINTER (hard_frame_pointer_rtx
) = 1;
5594 REG_POINTER (arg_pointer_rtx
) = 1;
5596 REG_POINTER (virtual_incoming_args_rtx
) = 1;
5597 REG_POINTER (virtual_stack_vars_rtx
) = 1;
5598 REG_POINTER (virtual_stack_dynamic_rtx
) = 1;
5599 REG_POINTER (virtual_outgoing_args_rtx
) = 1;
5600 REG_POINTER (virtual_cfa_rtx
) = 1;
5602 #ifdef STACK_BOUNDARY
5603 REGNO_POINTER_ALIGN (STACK_POINTER_REGNUM
) = STACK_BOUNDARY
;
5604 REGNO_POINTER_ALIGN (FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5605 REGNO_POINTER_ALIGN (HARD_FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5606 REGNO_POINTER_ALIGN (ARG_POINTER_REGNUM
) = STACK_BOUNDARY
;
5608 REGNO_POINTER_ALIGN (VIRTUAL_INCOMING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5609 REGNO_POINTER_ALIGN (VIRTUAL_STACK_VARS_REGNUM
) = STACK_BOUNDARY
;
5610 REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM
) = STACK_BOUNDARY
;
5611 REGNO_POINTER_ALIGN (VIRTUAL_OUTGOING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5612 REGNO_POINTER_ALIGN (VIRTUAL_CFA_REGNUM
) = BITS_PER_WORD
;
5615 #ifdef INIT_EXPANDERS
5620 /* Generate a vector constant for mode MODE and constant value CONSTANT. */
5623 gen_const_vector (enum machine_mode mode
, int constant
)
5628 enum machine_mode inner
;
5630 units
= GET_MODE_NUNITS (mode
);
5631 inner
= GET_MODE_INNER (mode
);
5633 gcc_assert (!DECIMAL_FLOAT_MODE_P (inner
));
5635 v
= rtvec_alloc (units
);
5637 /* We need to call this function after we set the scalar const_tiny_rtx
5639 gcc_assert (const_tiny_rtx
[constant
][(int) inner
]);
5641 for (i
= 0; i
< units
; ++i
)
5642 RTVEC_ELT (v
, i
) = const_tiny_rtx
[constant
][(int) inner
];
5644 tem
= gen_rtx_raw_CONST_VECTOR (mode
, v
);
5648 /* Generate a vector like gen_rtx_raw_CONST_VEC, but use the zero vector when
5649 all elements are zero, and the one vector when all elements are one. */
5651 gen_rtx_CONST_VECTOR (enum machine_mode mode
, rtvec v
)
5653 enum machine_mode inner
= GET_MODE_INNER (mode
);
5654 int nunits
= GET_MODE_NUNITS (mode
);
5658 /* Check to see if all of the elements have the same value. */
5659 x
= RTVEC_ELT (v
, nunits
- 1);
5660 for (i
= nunits
- 2; i
>= 0; i
--)
5661 if (RTVEC_ELT (v
, i
) != x
)
5664 /* If the values are all the same, check to see if we can use one of the
5665 standard constant vectors. */
5668 if (x
== CONST0_RTX (inner
))
5669 return CONST0_RTX (mode
);
5670 else if (x
== CONST1_RTX (inner
))
5671 return CONST1_RTX (mode
);
5672 else if (x
== CONSTM1_RTX (inner
))
5673 return CONSTM1_RTX (mode
);
5676 return gen_rtx_raw_CONST_VECTOR (mode
, v
);
5679 /* Initialise global register information required by all functions. */
5682 init_emit_regs (void)
5685 enum machine_mode mode
;
5688 /* Reset register attributes */
5689 htab_empty (reg_attrs_htab
);
5691 /* We need reg_raw_mode, so initialize the modes now. */
5692 init_reg_modes_target ();
5694 /* Assign register numbers to the globally defined register rtx. */
5695 stack_pointer_rtx
= gen_raw_REG (Pmode
, STACK_POINTER_REGNUM
);
5696 frame_pointer_rtx
= gen_raw_REG (Pmode
, FRAME_POINTER_REGNUM
);
5697 hard_frame_pointer_rtx
= gen_raw_REG (Pmode
, HARD_FRAME_POINTER_REGNUM
);
5698 arg_pointer_rtx
= gen_raw_REG (Pmode
, ARG_POINTER_REGNUM
);
5699 virtual_incoming_args_rtx
=
5700 gen_raw_REG (Pmode
, VIRTUAL_INCOMING_ARGS_REGNUM
);
5701 virtual_stack_vars_rtx
=
5702 gen_raw_REG (Pmode
, VIRTUAL_STACK_VARS_REGNUM
);
5703 virtual_stack_dynamic_rtx
=
5704 gen_raw_REG (Pmode
, VIRTUAL_STACK_DYNAMIC_REGNUM
);
5705 virtual_outgoing_args_rtx
=
5706 gen_raw_REG (Pmode
, VIRTUAL_OUTGOING_ARGS_REGNUM
);
5707 virtual_cfa_rtx
= gen_raw_REG (Pmode
, VIRTUAL_CFA_REGNUM
);
5708 virtual_preferred_stack_boundary_rtx
=
5709 gen_raw_REG (Pmode
, VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM
);
5711 /* Initialize RTL for commonly used hard registers. These are
5712 copied into regno_reg_rtx as we begin to compile each function. */
5713 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
5714 initial_regno_reg_rtx
[i
] = gen_raw_REG (reg_raw_mode
[i
], i
);
5716 #ifdef RETURN_ADDRESS_POINTER_REGNUM
5717 return_address_pointer_rtx
5718 = gen_raw_REG (Pmode
, RETURN_ADDRESS_POINTER_REGNUM
);
5721 if ((unsigned) PIC_OFFSET_TABLE_REGNUM
!= INVALID_REGNUM
)
5722 pic_offset_table_rtx
= gen_raw_REG (Pmode
, PIC_OFFSET_TABLE_REGNUM
);
5724 pic_offset_table_rtx
= NULL_RTX
;
5726 for (i
= 0; i
< (int) MAX_MACHINE_MODE
; i
++)
5728 mode
= (enum machine_mode
) i
;
5729 attrs
= ggc_alloc_cleared_mem_attrs ();
5730 attrs
->align
= BITS_PER_UNIT
;
5731 attrs
->addrspace
= ADDR_SPACE_GENERIC
;
5732 if (mode
!= BLKmode
)
5734 attrs
->size_known_p
= true;
5735 attrs
->size
= GET_MODE_SIZE (mode
);
5736 if (STRICT_ALIGNMENT
)
5737 attrs
->align
= GET_MODE_ALIGNMENT (mode
);
5739 mode_mem_attrs
[i
] = attrs
;
5743 /* Initialize global machine_mode variables. */
5746 init_derived_machine_modes (void)
5748 byte_mode
= VOIDmode
;
5749 word_mode
= VOIDmode
;
5751 for (enum machine_mode mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5753 mode
= GET_MODE_WIDER_MODE (mode
))
5755 if (GET_MODE_BITSIZE (mode
) == BITS_PER_UNIT
5756 && byte_mode
== VOIDmode
)
5759 if (GET_MODE_BITSIZE (mode
) == BITS_PER_WORD
5760 && word_mode
== VOIDmode
)
5764 ptr_mode
= mode_for_size (POINTER_SIZE
, GET_MODE_CLASS (Pmode
), 0);
5767 /* Create some permanent unique rtl objects shared between all functions. */
5770 init_emit_once (void)
5773 enum machine_mode mode
;
5774 enum machine_mode double_mode
;
5776 /* Initialize the CONST_INT, CONST_WIDE_INT, CONST_DOUBLE,
5777 CONST_FIXED, and memory attribute hash tables. */
5778 const_int_htab
= htab_create_ggc (37, const_int_htab_hash
,
5779 const_int_htab_eq
, NULL
);
5781 #if TARGET_SUPPORTS_WIDE_INT
5782 const_wide_int_htab
= htab_create_ggc (37, const_wide_int_htab_hash
,
5783 const_wide_int_htab_eq
, NULL
);
5785 const_double_htab
= htab_create_ggc (37, const_double_htab_hash
,
5786 const_double_htab_eq
, NULL
);
5788 const_fixed_htab
= htab_create_ggc (37, const_fixed_htab_hash
,
5789 const_fixed_htab_eq
, NULL
);
5791 reg_attrs_htab
= htab_create_ggc (37, reg_attrs_htab_hash
,
5792 reg_attrs_htab_eq
, NULL
);
5794 #ifdef INIT_EXPANDERS
5795 /* This is to initialize {init|mark|free}_machine_status before the first
5796 call to push_function_context_to. This is needed by the Chill front
5797 end which calls push_function_context_to before the first call to
5798 init_function_start. */
5802 /* Create the unique rtx's for certain rtx codes and operand values. */
5804 /* Don't use gen_rtx_CONST_INT here since gen_rtx_CONST_INT in this case
5805 tries to use these variables. */
5806 for (i
= - MAX_SAVED_CONST_INT
; i
<= MAX_SAVED_CONST_INT
; i
++)
5807 const_int_rtx
[i
+ MAX_SAVED_CONST_INT
] =
5808 gen_rtx_raw_CONST_INT (VOIDmode
, (HOST_WIDE_INT
) i
);
5810 if (STORE_FLAG_VALUE
>= - MAX_SAVED_CONST_INT
5811 && STORE_FLAG_VALUE
<= MAX_SAVED_CONST_INT
)
5812 const_true_rtx
= const_int_rtx
[STORE_FLAG_VALUE
+ MAX_SAVED_CONST_INT
];
5814 const_true_rtx
= gen_rtx_CONST_INT (VOIDmode
, STORE_FLAG_VALUE
);
5816 double_mode
= mode_for_size (DOUBLE_TYPE_SIZE
, MODE_FLOAT
, 0);
5818 real_from_integer (&dconst0
, double_mode
, 0, SIGNED
);
5819 real_from_integer (&dconst1
, double_mode
, 1, SIGNED
);
5820 real_from_integer (&dconst2
, double_mode
, 2, SIGNED
);
5825 dconsthalf
= dconst1
;
5826 SET_REAL_EXP (&dconsthalf
, REAL_EXP (&dconsthalf
) - 1);
5828 for (i
= 0; i
< 3; i
++)
5830 const REAL_VALUE_TYPE
*const r
=
5831 (i
== 0 ? &dconst0
: i
== 1 ? &dconst1
: &dconst2
);
5833 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
5835 mode
= GET_MODE_WIDER_MODE (mode
))
5836 const_tiny_rtx
[i
][(int) mode
] =
5837 CONST_DOUBLE_FROM_REAL_VALUE (*r
, mode
);
5839 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_DECIMAL_FLOAT
);
5841 mode
= GET_MODE_WIDER_MODE (mode
))
5842 const_tiny_rtx
[i
][(int) mode
] =
5843 CONST_DOUBLE_FROM_REAL_VALUE (*r
, mode
);
5845 const_tiny_rtx
[i
][(int) VOIDmode
] = GEN_INT (i
);
5847 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5849 mode
= GET_MODE_WIDER_MODE (mode
))
5850 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5852 for (mode
= MIN_MODE_PARTIAL_INT
;
5853 mode
<= MAX_MODE_PARTIAL_INT
;
5854 mode
= (enum machine_mode
)((int)(mode
) + 1))
5855 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5858 const_tiny_rtx
[3][(int) VOIDmode
] = constm1_rtx
;
5860 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5862 mode
= GET_MODE_WIDER_MODE (mode
))
5863 const_tiny_rtx
[3][(int) mode
] = constm1_rtx
;
5865 for (mode
= MIN_MODE_PARTIAL_INT
;
5866 mode
<= MAX_MODE_PARTIAL_INT
;
5867 mode
= (enum machine_mode
)((int)(mode
) + 1))
5868 const_tiny_rtx
[3][(int) mode
] = constm1_rtx
;
5870 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_COMPLEX_INT
);
5872 mode
= GET_MODE_WIDER_MODE (mode
))
5874 rtx inner
= const_tiny_rtx
[0][(int)GET_MODE_INNER (mode
)];
5875 const_tiny_rtx
[0][(int) mode
] = gen_rtx_CONCAT (mode
, inner
, inner
);
5878 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_COMPLEX_FLOAT
);
5880 mode
= GET_MODE_WIDER_MODE (mode
))
5882 rtx inner
= const_tiny_rtx
[0][(int)GET_MODE_INNER (mode
)];
5883 const_tiny_rtx
[0][(int) mode
] = gen_rtx_CONCAT (mode
, inner
, inner
);
5886 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
5888 mode
= GET_MODE_WIDER_MODE (mode
))
5890 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5891 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
5892 const_tiny_rtx
[3][(int) mode
] = gen_const_vector (mode
, 3);
5895 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
5897 mode
= GET_MODE_WIDER_MODE (mode
))
5899 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5900 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
5903 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FRACT
);
5905 mode
= GET_MODE_WIDER_MODE (mode
))
5907 FCONST0 (mode
).data
.high
= 0;
5908 FCONST0 (mode
).data
.low
= 0;
5909 FCONST0 (mode
).mode
= mode
;
5910 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5911 FCONST0 (mode
), mode
);
5914 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_UFRACT
);
5916 mode
= GET_MODE_WIDER_MODE (mode
))
5918 FCONST0 (mode
).data
.high
= 0;
5919 FCONST0 (mode
).data
.low
= 0;
5920 FCONST0 (mode
).mode
= mode
;
5921 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5922 FCONST0 (mode
), mode
);
5925 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_ACCUM
);
5927 mode
= GET_MODE_WIDER_MODE (mode
))
5929 FCONST0 (mode
).data
.high
= 0;
5930 FCONST0 (mode
).data
.low
= 0;
5931 FCONST0 (mode
).mode
= mode
;
5932 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5933 FCONST0 (mode
), mode
);
5935 /* We store the value 1. */
5936 FCONST1 (mode
).data
.high
= 0;
5937 FCONST1 (mode
).data
.low
= 0;
5938 FCONST1 (mode
).mode
= mode
;
5940 = double_int_one
.lshift (GET_MODE_FBIT (mode
),
5941 HOST_BITS_PER_DOUBLE_INT
,
5942 SIGNED_FIXED_POINT_MODE_P (mode
));
5943 const_tiny_rtx
[1][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5944 FCONST1 (mode
), mode
);
5947 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_UACCUM
);
5949 mode
= GET_MODE_WIDER_MODE (mode
))
5951 FCONST0 (mode
).data
.high
= 0;
5952 FCONST0 (mode
).data
.low
= 0;
5953 FCONST0 (mode
).mode
= mode
;
5954 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5955 FCONST0 (mode
), mode
);
5957 /* We store the value 1. */
5958 FCONST1 (mode
).data
.high
= 0;
5959 FCONST1 (mode
).data
.low
= 0;
5960 FCONST1 (mode
).mode
= mode
;
5962 = double_int_one
.lshift (GET_MODE_FBIT (mode
),
5963 HOST_BITS_PER_DOUBLE_INT
,
5964 SIGNED_FIXED_POINT_MODE_P (mode
));
5965 const_tiny_rtx
[1][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
5966 FCONST1 (mode
), mode
);
5969 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FRACT
);
5971 mode
= GET_MODE_WIDER_MODE (mode
))
5973 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5976 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_UFRACT
);
5978 mode
= GET_MODE_WIDER_MODE (mode
))
5980 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5983 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_ACCUM
);
5985 mode
= GET_MODE_WIDER_MODE (mode
))
5987 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5988 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
5991 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_UACCUM
);
5993 mode
= GET_MODE_WIDER_MODE (mode
))
5995 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5996 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
5999 for (i
= (int) CCmode
; i
< (int) MAX_MACHINE_MODE
; ++i
)
6000 if (GET_MODE_CLASS ((enum machine_mode
) i
) == MODE_CC
)
6001 const_tiny_rtx
[0][i
] = const0_rtx
;
6003 const_tiny_rtx
[0][(int) BImode
] = const0_rtx
;
6004 if (STORE_FLAG_VALUE
== 1)
6005 const_tiny_rtx
[1][(int) BImode
] = const1_rtx
;
6007 pc_rtx
= gen_rtx_fmt_ (PC
, VOIDmode
);
6008 ret_rtx
= gen_rtx_fmt_ (RETURN
, VOIDmode
);
6009 simple_return_rtx
= gen_rtx_fmt_ (SIMPLE_RETURN
, VOIDmode
);
6010 cc0_rtx
= gen_rtx_fmt_ (CC0
, VOIDmode
);
6013 /* Produce exact duplicate of insn INSN after AFTER.
6014 Care updating of libcall regions if present. */
6017 emit_copy_of_insn_after (rtx insn
, rtx after
)
6021 switch (GET_CODE (insn
))
6024 new_rtx
= emit_insn_after (copy_insn (PATTERN (insn
)), after
);
6028 new_rtx
= emit_jump_insn_after (copy_insn (PATTERN (insn
)), after
);
6032 new_rtx
= emit_debug_insn_after (copy_insn (PATTERN (insn
)), after
);
6036 new_rtx
= emit_call_insn_after (copy_insn (PATTERN (insn
)), after
);
6037 if (CALL_INSN_FUNCTION_USAGE (insn
))
6038 CALL_INSN_FUNCTION_USAGE (new_rtx
)
6039 = copy_insn (CALL_INSN_FUNCTION_USAGE (insn
));
6040 SIBLING_CALL_P (new_rtx
) = SIBLING_CALL_P (insn
);
6041 RTL_CONST_CALL_P (new_rtx
) = RTL_CONST_CALL_P (insn
);
6042 RTL_PURE_CALL_P (new_rtx
) = RTL_PURE_CALL_P (insn
);
6043 RTL_LOOPING_CONST_OR_PURE_CALL_P (new_rtx
)
6044 = RTL_LOOPING_CONST_OR_PURE_CALL_P (insn
);
6051 /* Update LABEL_NUSES. */
6052 mark_jump_label (PATTERN (new_rtx
), new_rtx
, 0);
6054 INSN_LOCATION (new_rtx
) = INSN_LOCATION (insn
);
6056 /* If the old insn is frame related, then so is the new one. This is
6057 primarily needed for IA-64 unwind info which marks epilogue insns,
6058 which may be duplicated by the basic block reordering code. */
6059 RTX_FRAME_RELATED_P (new_rtx
) = RTX_FRAME_RELATED_P (insn
);
6061 /* Copy all REG_NOTES except REG_LABEL_OPERAND since mark_jump_label
6062 will make them. REG_LABEL_TARGETs are created there too, but are
6063 supposed to be sticky, so we copy them. */
6064 for (link
= REG_NOTES (insn
); link
; link
= XEXP (link
, 1))
6065 if (REG_NOTE_KIND (link
) != REG_LABEL_OPERAND
)
6067 if (GET_CODE (link
) == EXPR_LIST
)
6068 add_reg_note (new_rtx
, REG_NOTE_KIND (link
),
6069 copy_insn_1 (XEXP (link
, 0)));
6071 add_shallow_copy_of_reg_note (new_rtx
, link
);
6074 INSN_CODE (new_rtx
) = INSN_CODE (insn
);
6078 static GTY((deletable
)) rtx hard_reg_clobbers
[NUM_MACHINE_MODES
][FIRST_PSEUDO_REGISTER
];
6080 gen_hard_reg_clobber (enum machine_mode mode
, unsigned int regno
)
6082 if (hard_reg_clobbers
[mode
][regno
])
6083 return hard_reg_clobbers
[mode
][regno
];
6085 return (hard_reg_clobbers
[mode
][regno
] =
6086 gen_rtx_CLOBBER (VOIDmode
, gen_rtx_REG (mode
, regno
)));
6089 location_t prologue_location
;
6090 location_t epilogue_location
;
6092 /* Hold current location information and last location information, so the
6093 datastructures are built lazily only when some instructions in given
6094 place are needed. */
6095 static location_t curr_location
;
6097 /* Allocate insn location datastructure. */
6099 insn_locations_init (void)
6101 prologue_location
= epilogue_location
= 0;
6102 curr_location
= UNKNOWN_LOCATION
;
6105 /* At the end of emit stage, clear current location. */
6107 insn_locations_finalize (void)
6109 epilogue_location
= curr_location
;
6110 curr_location
= UNKNOWN_LOCATION
;
6113 /* Set current location. */
6115 set_curr_insn_location (location_t location
)
6117 curr_location
= location
;
6120 /* Get current location. */
6122 curr_insn_location (void)
6124 return curr_location
;
6127 /* Return lexical scope block insn belongs to. */
6129 insn_scope (const_rtx insn
)
6131 return LOCATION_BLOCK (INSN_LOCATION (insn
));
6134 /* Return line number of the statement that produced this insn. */
6136 insn_line (const_rtx insn
)
6138 return LOCATION_LINE (INSN_LOCATION (insn
));
6141 /* Return source file of the statement that produced this insn. */
6143 insn_file (const_rtx insn
)
6145 return LOCATION_FILE (INSN_LOCATION (insn
));
6148 /* Return true if memory model MODEL requires a pre-operation (release-style)
6149 barrier or a post-operation (acquire-style) barrier. While not universal,
6150 this function matches behavior of several targets. */
6153 need_atomic_barrier_p (enum memmodel model
, bool pre
)
6155 switch (model
& MEMMODEL_MASK
)
6157 case MEMMODEL_RELAXED
:
6158 case MEMMODEL_CONSUME
:
6160 case MEMMODEL_RELEASE
:
6162 case MEMMODEL_ACQUIRE
:
6164 case MEMMODEL_ACQ_REL
:
6165 case MEMMODEL_SEQ_CST
:
6172 #include "gt-emit-rtl.h"