1 /* Emit RTL for the GCC expander.
2 Copyright (C) 1987-2016 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"
44 #include "stringpool.h"
45 #include "insn-config.h"
49 #include "diagnostic-core.h"
51 #include "fold-const.h"
60 #include "stor-layout.h"
63 struct target_rtl default_target_rtl
;
65 struct target_rtl
*this_target_rtl
= &default_target_rtl
;
68 #define initial_regno_reg_rtx (this_target_rtl->x_initial_regno_reg_rtx)
70 /* Commonly used modes. */
72 machine_mode byte_mode
; /* Mode whose width is BITS_PER_UNIT. */
73 machine_mode word_mode
; /* Mode whose width is BITS_PER_WORD. */
74 machine_mode double_mode
; /* Mode whose width is DOUBLE_TYPE_SIZE. */
75 machine_mode ptr_mode
; /* Mode whose width is POINTER_SIZE. */
77 /* Datastructures maintained for currently processed function in RTL form. */
79 struct rtl_data x_rtl
;
81 /* Indexed by pseudo register number, gives the rtx for that pseudo.
82 Allocated in parallel with regno_pointer_align.
83 FIXME: We could put it into emit_status struct, but gengtype is not able to deal
84 with length attribute nested in top level structures. */
88 /* This is *not* reset after each function. It gives each CODE_LABEL
89 in the entire compilation a unique label number. */
91 static GTY(()) int label_num
= 1;
93 /* We record floating-point CONST_DOUBLEs in each floating-point mode for
94 the values of 0, 1, and 2. For the integer entries and VOIDmode, we
95 record a copy of const[012]_rtx and constm1_rtx. CONSTM1_RTX
96 is set only for MODE_INT and MODE_VECTOR_INT modes. */
98 rtx const_tiny_rtx
[4][(int) MAX_MACHINE_MODE
];
102 REAL_VALUE_TYPE dconst0
;
103 REAL_VALUE_TYPE dconst1
;
104 REAL_VALUE_TYPE dconst2
;
105 REAL_VALUE_TYPE dconstm1
;
106 REAL_VALUE_TYPE dconsthalf
;
108 /* Record fixed-point constant 0 and 1. */
109 FIXED_VALUE_TYPE fconst0
[MAX_FCONST0
];
110 FIXED_VALUE_TYPE fconst1
[MAX_FCONST1
];
112 /* We make one copy of (const_int C) where C is in
113 [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT]
114 to save space during the compilation and simplify comparisons of
117 rtx const_int_rtx
[MAX_SAVED_CONST_INT
* 2 + 1];
119 /* Standard pieces of rtx, to be substituted directly into things. */
122 rtx simple_return_rtx
;
125 /* Marker used for denoting an INSN, which should never be accessed (i.e.,
126 this pointer should normally never be dereferenced), but is required to be
127 distinct from NULL_RTX. Currently used by peephole2 pass. */
128 rtx_insn
*invalid_insn_rtx
;
130 /* A hash table storing CONST_INTs whose absolute value is greater
131 than MAX_SAVED_CONST_INT. */
133 struct const_int_hasher
: ggc_cache_ptr_hash
<rtx_def
>
135 typedef HOST_WIDE_INT compare_type
;
137 static hashval_t
hash (rtx i
);
138 static bool equal (rtx i
, HOST_WIDE_INT h
);
141 static GTY ((cache
)) hash_table
<const_int_hasher
> *const_int_htab
;
143 struct const_wide_int_hasher
: ggc_cache_ptr_hash
<rtx_def
>
145 static hashval_t
hash (rtx x
);
146 static bool equal (rtx x
, rtx y
);
149 static GTY ((cache
)) hash_table
<const_wide_int_hasher
> *const_wide_int_htab
;
151 /* A hash table storing register attribute structures. */
152 struct reg_attr_hasher
: ggc_cache_ptr_hash
<reg_attrs
>
154 static hashval_t
hash (reg_attrs
*x
);
155 static bool equal (reg_attrs
*a
, reg_attrs
*b
);
158 static GTY ((cache
)) hash_table
<reg_attr_hasher
> *reg_attrs_htab
;
160 /* A hash table storing all CONST_DOUBLEs. */
161 struct const_double_hasher
: ggc_cache_ptr_hash
<rtx_def
>
163 static hashval_t
hash (rtx x
);
164 static bool equal (rtx x
, rtx y
);
167 static GTY ((cache
)) hash_table
<const_double_hasher
> *const_double_htab
;
169 /* A hash table storing all CONST_FIXEDs. */
170 struct const_fixed_hasher
: ggc_cache_ptr_hash
<rtx_def
>
172 static hashval_t
hash (rtx x
);
173 static bool equal (rtx x
, rtx y
);
176 static GTY ((cache
)) hash_table
<const_fixed_hasher
> *const_fixed_htab
;
178 #define cur_insn_uid (crtl->emit.x_cur_insn_uid)
179 #define cur_debug_insn_uid (crtl->emit.x_cur_debug_insn_uid)
180 #define first_label_num (crtl->emit.x_first_label_num)
182 static void set_used_decls (tree
);
183 static void mark_label_nuses (rtx
);
184 #if TARGET_SUPPORTS_WIDE_INT
185 static rtx
lookup_const_wide_int (rtx
);
187 static rtx
lookup_const_double (rtx
);
188 static rtx
lookup_const_fixed (rtx
);
189 static reg_attrs
*get_reg_attrs (tree
, int);
190 static rtx
gen_const_vector (machine_mode
, int);
191 static void copy_rtx_if_shared_1 (rtx
*orig
);
193 /* Probability of the conditional branch currently proceeded by try_split.
194 Set to -1 otherwise. */
195 int split_branch_probability
= -1;
197 /* Returns a hash code for X (which is a really a CONST_INT). */
200 const_int_hasher::hash (rtx x
)
202 return (hashval_t
) INTVAL (x
);
205 /* Returns nonzero if the value represented by X (which is really a
206 CONST_INT) is the same as that given by Y (which is really a
210 const_int_hasher::equal (rtx x
, HOST_WIDE_INT y
)
212 return (INTVAL (x
) == y
);
215 #if TARGET_SUPPORTS_WIDE_INT
216 /* Returns a hash code for X (which is a really a CONST_WIDE_INT). */
219 const_wide_int_hasher::hash (rtx x
)
222 unsigned HOST_WIDE_INT hash
= 0;
225 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (xr
); i
++)
226 hash
+= CONST_WIDE_INT_ELT (xr
, i
);
228 return (hashval_t
) hash
;
231 /* Returns nonzero if the value represented by X (which is really a
232 CONST_WIDE_INT) is the same as that given by Y (which is really a
236 const_wide_int_hasher::equal (rtx x
, rtx y
)
241 if (CONST_WIDE_INT_NUNITS (xr
) != CONST_WIDE_INT_NUNITS (yr
))
244 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (xr
); i
++)
245 if (CONST_WIDE_INT_ELT (xr
, i
) != CONST_WIDE_INT_ELT (yr
, i
))
252 /* Returns a hash code for X (which is really a CONST_DOUBLE). */
254 const_double_hasher::hash (rtx x
)
256 const_rtx
const value
= x
;
259 if (TARGET_SUPPORTS_WIDE_INT
== 0 && GET_MODE (value
) == VOIDmode
)
260 h
= CONST_DOUBLE_LOW (value
) ^ CONST_DOUBLE_HIGH (value
);
263 h
= real_hash (CONST_DOUBLE_REAL_VALUE (value
));
264 /* MODE is used in the comparison, so it should be in the hash. */
265 h
^= GET_MODE (value
);
270 /* Returns nonzero if the value represented by X (really a ...)
271 is the same as that represented by Y (really a ...) */
273 const_double_hasher::equal (rtx x
, rtx y
)
275 const_rtx
const a
= x
, b
= y
;
277 if (GET_MODE (a
) != GET_MODE (b
))
279 if (TARGET_SUPPORTS_WIDE_INT
== 0 && GET_MODE (a
) == VOIDmode
)
280 return (CONST_DOUBLE_LOW (a
) == CONST_DOUBLE_LOW (b
)
281 && CONST_DOUBLE_HIGH (a
) == CONST_DOUBLE_HIGH (b
));
283 return real_identical (CONST_DOUBLE_REAL_VALUE (a
),
284 CONST_DOUBLE_REAL_VALUE (b
));
287 /* Returns a hash code for X (which is really a CONST_FIXED). */
290 const_fixed_hasher::hash (rtx x
)
292 const_rtx
const value
= x
;
295 h
= fixed_hash (CONST_FIXED_VALUE (value
));
296 /* MODE is used in the comparison, so it should be in the hash. */
297 h
^= GET_MODE (value
);
301 /* Returns nonzero if the value represented by X is the same as that
305 const_fixed_hasher::equal (rtx x
, rtx y
)
307 const_rtx
const a
= x
, b
= y
;
309 if (GET_MODE (a
) != GET_MODE (b
))
311 return fixed_identical (CONST_FIXED_VALUE (a
), CONST_FIXED_VALUE (b
));
314 /* Return true if the given memory attributes are equal. */
317 mem_attrs_eq_p (const struct mem_attrs
*p
, const struct mem_attrs
*q
)
323 return (p
->alias
== q
->alias
324 && p
->offset_known_p
== q
->offset_known_p
325 && (!p
->offset_known_p
|| p
->offset
== q
->offset
)
326 && p
->size_known_p
== q
->size_known_p
327 && (!p
->size_known_p
|| p
->size
== q
->size
)
328 && p
->align
== q
->align
329 && p
->addrspace
== q
->addrspace
330 && (p
->expr
== q
->expr
331 || (p
->expr
!= NULL_TREE
&& q
->expr
!= NULL_TREE
332 && operand_equal_p (p
->expr
, q
->expr
, 0))));
335 /* Set MEM's memory attributes so that they are the same as ATTRS. */
338 set_mem_attrs (rtx mem
, mem_attrs
*attrs
)
340 /* If everything is the default, we can just clear the attributes. */
341 if (mem_attrs_eq_p (attrs
, mode_mem_attrs
[(int) GET_MODE (mem
)]))
348 || !mem_attrs_eq_p (attrs
, MEM_ATTRS (mem
)))
350 MEM_ATTRS (mem
) = ggc_alloc
<mem_attrs
> ();
351 memcpy (MEM_ATTRS (mem
), attrs
, sizeof (mem_attrs
));
355 /* Returns a hash code for X (which is a really a reg_attrs *). */
358 reg_attr_hasher::hash (reg_attrs
*x
)
360 const reg_attrs
*const p
= x
;
362 return ((p
->offset
* 1000) ^ (intptr_t) p
->decl
);
365 /* Returns nonzero if the value represented by X is the same as that given by
369 reg_attr_hasher::equal (reg_attrs
*x
, reg_attrs
*y
)
371 const reg_attrs
*const p
= x
;
372 const reg_attrs
*const q
= y
;
374 return (p
->decl
== q
->decl
&& p
->offset
== q
->offset
);
376 /* Allocate a new reg_attrs structure and insert it into the hash table if
377 one identical to it is not already in the table. We are doing this for
381 get_reg_attrs (tree decl
, int offset
)
385 /* If everything is the default, we can just return zero. */
386 if (decl
== 0 && offset
== 0)
390 attrs
.offset
= offset
;
392 reg_attrs
**slot
= reg_attrs_htab
->find_slot (&attrs
, INSERT
);
395 *slot
= ggc_alloc
<reg_attrs
> ();
396 memcpy (*slot
, &attrs
, sizeof (reg_attrs
));
404 /* Generate an empty ASM_INPUT, which is used to block attempts to schedule,
405 and to block register equivalences to be seen across this insn. */
410 rtx x
= gen_rtx_ASM_INPUT (VOIDmode
, "");
411 MEM_VOLATILE_P (x
) = true;
417 /* Set the mode and register number of X to MODE and REGNO. */
420 set_mode_and_regno (rtx x
, machine_mode mode
, unsigned int regno
)
422 unsigned int nregs
= (HARD_REGISTER_NUM_P (regno
)
423 ? hard_regno_nregs
[regno
][mode
]
425 PUT_MODE_RAW (x
, mode
);
426 set_regno_raw (x
, regno
, nregs
);
429 /* Generate a new REG rtx. Make sure ORIGINAL_REGNO is set properly, and
430 don't attempt to share with the various global pieces of rtl (such as
431 frame_pointer_rtx). */
434 gen_raw_REG (machine_mode mode
, unsigned int regno
)
436 rtx x
= rtx_alloc_stat (REG MEM_STAT_INFO
);
437 set_mode_and_regno (x
, mode
, regno
);
438 REG_ATTRS (x
) = NULL
;
439 ORIGINAL_REGNO (x
) = regno
;
443 /* There are some RTL codes that require special attention; the generation
444 functions do the raw handling. If you add to this list, modify
445 special_rtx in gengenrtl.c as well. */
448 gen_rtx_EXPR_LIST (machine_mode mode
, rtx expr
, rtx expr_list
)
450 return as_a
<rtx_expr_list
*> (gen_rtx_fmt_ee (EXPR_LIST
, mode
, expr
,
455 gen_rtx_INSN_LIST (machine_mode mode
, rtx insn
, rtx insn_list
)
457 return as_a
<rtx_insn_list
*> (gen_rtx_fmt_ue (INSN_LIST
, mode
, insn
,
462 gen_rtx_INSN (machine_mode mode
, rtx_insn
*prev_insn
, rtx_insn
*next_insn
,
463 basic_block bb
, rtx pattern
, int location
, int code
,
466 return as_a
<rtx_insn
*> (gen_rtx_fmt_uuBeiie (INSN
, mode
,
467 prev_insn
, next_insn
,
468 bb
, pattern
, location
, code
,
473 gen_rtx_CONST_INT (machine_mode mode ATTRIBUTE_UNUSED
, HOST_WIDE_INT arg
)
475 if (arg
>= - MAX_SAVED_CONST_INT
&& arg
<= MAX_SAVED_CONST_INT
)
476 return const_int_rtx
[arg
+ MAX_SAVED_CONST_INT
];
478 #if STORE_FLAG_VALUE != 1 && STORE_FLAG_VALUE != -1
479 if (const_true_rtx
&& arg
== STORE_FLAG_VALUE
)
480 return const_true_rtx
;
483 /* Look up the CONST_INT in the hash table. */
484 rtx
*slot
= const_int_htab
->find_slot_with_hash (arg
, (hashval_t
) arg
,
487 *slot
= gen_rtx_raw_CONST_INT (VOIDmode
, arg
);
493 gen_int_mode (HOST_WIDE_INT c
, machine_mode mode
)
495 return GEN_INT (trunc_int_for_mode (c
, mode
));
498 /* CONST_DOUBLEs might be created from pairs of integers, or from
499 REAL_VALUE_TYPEs. Also, their length is known only at run time,
500 so we cannot use gen_rtx_raw_CONST_DOUBLE. */
502 /* Determine whether REAL, a CONST_DOUBLE, already exists in the
503 hash table. If so, return its counterpart; otherwise add it
504 to the hash table and return it. */
506 lookup_const_double (rtx real
)
508 rtx
*slot
= const_double_htab
->find_slot (real
, INSERT
);
515 /* Return a CONST_DOUBLE rtx for a floating-point value specified by
516 VALUE in mode MODE. */
518 const_double_from_real_value (REAL_VALUE_TYPE value
, machine_mode mode
)
520 rtx real
= rtx_alloc (CONST_DOUBLE
);
521 PUT_MODE (real
, mode
);
525 return lookup_const_double (real
);
528 /* Determine whether FIXED, a CONST_FIXED, already exists in the
529 hash table. If so, return its counterpart; otherwise add it
530 to the hash table and return it. */
533 lookup_const_fixed (rtx fixed
)
535 rtx
*slot
= const_fixed_htab
->find_slot (fixed
, INSERT
);
542 /* Return a CONST_FIXED rtx for a fixed-point value specified by
543 VALUE in mode MODE. */
546 const_fixed_from_fixed_value (FIXED_VALUE_TYPE value
, machine_mode mode
)
548 rtx fixed
= rtx_alloc (CONST_FIXED
);
549 PUT_MODE (fixed
, mode
);
553 return lookup_const_fixed (fixed
);
556 #if TARGET_SUPPORTS_WIDE_INT == 0
557 /* Constructs double_int from rtx CST. */
560 rtx_to_double_int (const_rtx cst
)
564 if (CONST_INT_P (cst
))
565 r
= double_int::from_shwi (INTVAL (cst
));
566 else if (CONST_DOUBLE_AS_INT_P (cst
))
568 r
.low
= CONST_DOUBLE_LOW (cst
);
569 r
.high
= CONST_DOUBLE_HIGH (cst
);
578 #if TARGET_SUPPORTS_WIDE_INT
579 /* Determine whether CONST_WIDE_INT WINT already exists in the hash table.
580 If so, return its counterpart; otherwise add it to the hash table and
584 lookup_const_wide_int (rtx wint
)
586 rtx
*slot
= const_wide_int_htab
->find_slot (wint
, INSERT
);
594 /* Return an rtx constant for V, given that the constant has mode MODE.
595 The returned rtx will be a CONST_INT if V fits, otherwise it will be
596 a CONST_DOUBLE (if !TARGET_SUPPORTS_WIDE_INT) or a CONST_WIDE_INT
597 (if TARGET_SUPPORTS_WIDE_INT). */
600 immed_wide_int_const (const wide_int_ref
&v
, machine_mode mode
)
602 unsigned int len
= v
.get_len ();
603 unsigned int prec
= GET_MODE_PRECISION (mode
);
605 /* Allow truncation but not extension since we do not know if the
606 number is signed or unsigned. */
607 gcc_assert (prec
<= v
.get_precision ());
609 if (len
< 2 || prec
<= HOST_BITS_PER_WIDE_INT
)
610 return gen_int_mode (v
.elt (0), mode
);
612 #if TARGET_SUPPORTS_WIDE_INT
616 unsigned int blocks_needed
617 = (prec
+ HOST_BITS_PER_WIDE_INT
- 1) / HOST_BITS_PER_WIDE_INT
;
619 if (len
> blocks_needed
)
622 value
= const_wide_int_alloc (len
);
624 /* It is so tempting to just put the mode in here. Must control
626 PUT_MODE (value
, VOIDmode
);
627 CWI_PUT_NUM_ELEM (value
, len
);
629 for (i
= 0; i
< len
; i
++)
630 CONST_WIDE_INT_ELT (value
, i
) = v
.elt (i
);
632 return lookup_const_wide_int (value
);
635 return immed_double_const (v
.elt (0), v
.elt (1), mode
);
639 #if TARGET_SUPPORTS_WIDE_INT == 0
640 /* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair
641 of ints: I0 is the low-order word and I1 is the high-order word.
642 For values that are larger than HOST_BITS_PER_DOUBLE_INT, the
643 implied upper bits are copies of the high bit of i1. The value
644 itself is neither signed nor unsigned. Do not use this routine for
645 non-integer modes; convert to REAL_VALUE_TYPE and use
646 const_double_from_real_value. */
649 immed_double_const (HOST_WIDE_INT i0
, HOST_WIDE_INT i1
, machine_mode mode
)
654 /* There are the following cases (note that there are no modes with
655 HOST_BITS_PER_WIDE_INT < GET_MODE_BITSIZE (mode) < HOST_BITS_PER_DOUBLE_INT):
657 1) If GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT, then we use
659 2) If the value of the integer fits into HOST_WIDE_INT anyway
660 (i.e., i1 consists only from copies of the sign bit, and sign
661 of i0 and i1 are the same), then we return a CONST_INT for i0.
662 3) Otherwise, we create a CONST_DOUBLE for i0 and i1. */
663 if (mode
!= VOIDmode
)
665 gcc_assert (GET_MODE_CLASS (mode
) == MODE_INT
666 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
667 /* We can get a 0 for an error mark. */
668 || GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
669 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
670 || GET_MODE_CLASS (mode
) == MODE_POINTER_BOUNDS
);
672 if (GET_MODE_BITSIZE (mode
) <= HOST_BITS_PER_WIDE_INT
)
673 return gen_int_mode (i0
, mode
);
676 /* If this integer fits in one word, return a CONST_INT. */
677 if ((i1
== 0 && i0
>= 0) || (i1
== ~0 && i0
< 0))
680 /* We use VOIDmode for integers. */
681 value
= rtx_alloc (CONST_DOUBLE
);
682 PUT_MODE (value
, VOIDmode
);
684 CONST_DOUBLE_LOW (value
) = i0
;
685 CONST_DOUBLE_HIGH (value
) = i1
;
687 for (i
= 2; i
< (sizeof CONST_DOUBLE_FORMAT
- 1); i
++)
688 XWINT (value
, i
) = 0;
690 return lookup_const_double (value
);
695 gen_rtx_REG (machine_mode mode
, unsigned int regno
)
697 /* In case the MD file explicitly references the frame pointer, have
698 all such references point to the same frame pointer. This is
699 used during frame pointer elimination to distinguish the explicit
700 references to these registers from pseudos that happened to be
703 If we have eliminated the frame pointer or arg pointer, we will
704 be using it as a normal register, for example as a spill
705 register. In such cases, we might be accessing it in a mode that
706 is not Pmode and therefore cannot use the pre-allocated rtx.
708 Also don't do this when we are making new REGs in reload, since
709 we don't want to get confused with the real pointers. */
711 if (mode
== Pmode
&& !reload_in_progress
&& !lra_in_progress
)
713 if (regno
== FRAME_POINTER_REGNUM
714 && (!reload_completed
|| frame_pointer_needed
))
715 return frame_pointer_rtx
;
717 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER
718 && regno
== HARD_FRAME_POINTER_REGNUM
719 && (!reload_completed
|| frame_pointer_needed
))
720 return hard_frame_pointer_rtx
;
721 #if !HARD_FRAME_POINTER_IS_ARG_POINTER
722 if (FRAME_POINTER_REGNUM
!= ARG_POINTER_REGNUM
723 && regno
== ARG_POINTER_REGNUM
)
724 return arg_pointer_rtx
;
726 #ifdef RETURN_ADDRESS_POINTER_REGNUM
727 if (regno
== RETURN_ADDRESS_POINTER_REGNUM
)
728 return return_address_pointer_rtx
;
730 if (regno
== (unsigned) PIC_OFFSET_TABLE_REGNUM
731 && PIC_OFFSET_TABLE_REGNUM
!= INVALID_REGNUM
732 && fixed_regs
[PIC_OFFSET_TABLE_REGNUM
])
733 return pic_offset_table_rtx
;
734 if (regno
== STACK_POINTER_REGNUM
)
735 return stack_pointer_rtx
;
739 /* If the per-function register table has been set up, try to re-use
740 an existing entry in that table to avoid useless generation of RTL.
742 This code is disabled for now until we can fix the various backends
743 which depend on having non-shared hard registers in some cases. Long
744 term we want to re-enable this code as it can significantly cut down
745 on the amount of useless RTL that gets generated.
747 We'll also need to fix some code that runs after reload that wants to
748 set ORIGINAL_REGNO. */
753 && regno
< FIRST_PSEUDO_REGISTER
754 && reg_raw_mode
[regno
] == mode
)
755 return regno_reg_rtx
[regno
];
758 return gen_raw_REG (mode
, regno
);
762 gen_rtx_MEM (machine_mode mode
, rtx addr
)
764 rtx rt
= gen_rtx_raw_MEM (mode
, addr
);
766 /* This field is not cleared by the mere allocation of the rtx, so
773 /* Generate a memory referring to non-trapping constant memory. */
776 gen_const_mem (machine_mode mode
, rtx addr
)
778 rtx mem
= gen_rtx_MEM (mode
, addr
);
779 MEM_READONLY_P (mem
) = 1;
780 MEM_NOTRAP_P (mem
) = 1;
784 /* Generate a MEM referring to fixed portions of the frame, e.g., register
788 gen_frame_mem (machine_mode mode
, rtx addr
)
790 rtx mem
= gen_rtx_MEM (mode
, addr
);
791 MEM_NOTRAP_P (mem
) = 1;
792 set_mem_alias_set (mem
, get_frame_alias_set ());
796 /* Generate a MEM referring to a temporary use of the stack, not part
797 of the fixed stack frame. For example, something which is pushed
798 by a target splitter. */
800 gen_tmp_stack_mem (machine_mode mode
, rtx addr
)
802 rtx mem
= gen_rtx_MEM (mode
, addr
);
803 MEM_NOTRAP_P (mem
) = 1;
804 if (!cfun
->calls_alloca
)
805 set_mem_alias_set (mem
, get_frame_alias_set ());
809 /* We want to create (subreg:OMODE (obj:IMODE) OFFSET). Return true if
810 this construct would be valid, and false otherwise. */
813 validate_subreg (machine_mode omode
, machine_mode imode
,
814 const_rtx reg
, unsigned int offset
)
816 unsigned int isize
= GET_MODE_SIZE (imode
);
817 unsigned int osize
= GET_MODE_SIZE (omode
);
819 /* All subregs must be aligned. */
820 if (offset
% osize
!= 0)
823 /* The subreg offset cannot be outside the inner object. */
827 /* ??? This should not be here. Temporarily continue to allow word_mode
828 subregs of anything. The most common offender is (subreg:SI (reg:DF)).
829 Generally, backends are doing something sketchy but it'll take time to
831 if (omode
== word_mode
)
833 /* ??? Similarly, e.g. with (subreg:DF (reg:TI)). Though store_bit_field
834 is the culprit here, and not the backends. */
835 else if (osize
>= UNITS_PER_WORD
&& isize
>= osize
)
837 /* Allow component subregs of complex and vector. Though given the below
838 extraction rules, it's not always clear what that means. */
839 else if ((COMPLEX_MODE_P (imode
) || VECTOR_MODE_P (imode
))
840 && GET_MODE_INNER (imode
) == omode
)
842 /* ??? x86 sse code makes heavy use of *paradoxical* vector subregs,
843 i.e. (subreg:V4SF (reg:SF) 0). This surely isn't the cleanest way to
844 represent this. It's questionable if this ought to be represented at
845 all -- why can't this all be hidden in post-reload splitters that make
846 arbitrarily mode changes to the registers themselves. */
847 else if (VECTOR_MODE_P (omode
) && GET_MODE_INNER (omode
) == imode
)
849 /* Subregs involving floating point modes are not allowed to
850 change size. Therefore (subreg:DI (reg:DF) 0) is fine, but
851 (subreg:SI (reg:DF) 0) isn't. */
852 else if (FLOAT_MODE_P (imode
) || FLOAT_MODE_P (omode
))
854 if (! (isize
== osize
855 /* LRA can use subreg to store a floating point value in
856 an integer mode. Although the floating point and the
857 integer modes need the same number of hard registers,
858 the size of floating point mode can be less than the
859 integer mode. LRA also uses subregs for a register
860 should be used in different mode in on insn. */
865 /* Paradoxical subregs must have offset zero. */
869 /* This is a normal subreg. Verify that the offset is representable. */
871 /* For hard registers, we already have most of these rules collected in
872 subreg_offset_representable_p. */
873 if (reg
&& REG_P (reg
) && HARD_REGISTER_P (reg
))
875 unsigned int regno
= REGNO (reg
);
877 #ifdef CANNOT_CHANGE_MODE_CLASS
878 if ((COMPLEX_MODE_P (imode
) || VECTOR_MODE_P (imode
))
879 && GET_MODE_INNER (imode
) == omode
)
881 else if (REG_CANNOT_CHANGE_MODE_P (regno
, imode
, omode
))
885 return subreg_offset_representable_p (regno
, imode
, offset
, omode
);
888 /* For pseudo registers, we want most of the same checks. Namely:
889 If the register no larger than a word, the subreg must be lowpart.
890 If the register is larger than a word, the subreg must be the lowpart
891 of a subword. A subreg does *not* perform arbitrary bit extraction.
892 Given that we've already checked mode/offset alignment, we only have
893 to check subword subregs here. */
894 if (osize
< UNITS_PER_WORD
895 && ! (lra_in_progress
&& (FLOAT_MODE_P (imode
) || FLOAT_MODE_P (omode
))))
897 machine_mode wmode
= isize
> UNITS_PER_WORD
? word_mode
: imode
;
898 unsigned int low_off
= subreg_lowpart_offset (omode
, wmode
);
899 if (offset
% UNITS_PER_WORD
!= low_off
)
906 gen_rtx_SUBREG (machine_mode mode
, rtx reg
, int offset
)
908 gcc_assert (validate_subreg (mode
, GET_MODE (reg
), reg
, offset
));
909 return gen_rtx_raw_SUBREG (mode
, reg
, offset
);
912 /* Generate a SUBREG representing the least-significant part of REG if MODE
913 is smaller than mode of REG, otherwise paradoxical SUBREG. */
916 gen_lowpart_SUBREG (machine_mode mode
, rtx reg
)
920 inmode
= GET_MODE (reg
);
921 if (inmode
== VOIDmode
)
923 return gen_rtx_SUBREG (mode
, reg
,
924 subreg_lowpart_offset (mode
, inmode
));
928 gen_rtx_VAR_LOCATION (machine_mode mode
, tree decl
, rtx loc
,
929 enum var_init_status status
)
931 rtx x
= gen_rtx_fmt_te (VAR_LOCATION
, mode
, decl
, loc
);
932 PAT_VAR_LOCATION_STATUS (x
) = status
;
937 /* Create an rtvec and stores within it the RTXen passed in the arguments. */
940 gen_rtvec (int n
, ...)
948 /* Don't allocate an empty rtvec... */
955 rt_val
= rtvec_alloc (n
);
957 for (i
= 0; i
< n
; i
++)
958 rt_val
->elem
[i
] = va_arg (p
, rtx
);
965 gen_rtvec_v (int n
, rtx
*argp
)
970 /* Don't allocate an empty rtvec... */
974 rt_val
= rtvec_alloc (n
);
976 for (i
= 0; i
< n
; i
++)
977 rt_val
->elem
[i
] = *argp
++;
983 gen_rtvec_v (int n
, rtx_insn
**argp
)
988 /* Don't allocate an empty rtvec... */
992 rt_val
= rtvec_alloc (n
);
994 for (i
= 0; i
< n
; i
++)
995 rt_val
->elem
[i
] = *argp
++;
1001 /* Return the number of bytes between the start of an OUTER_MODE
1002 in-memory value and the start of an INNER_MODE in-memory value,
1003 given that the former is a lowpart of the latter. It may be a
1004 paradoxical lowpart, in which case the offset will be negative
1005 on big-endian targets. */
1008 byte_lowpart_offset (machine_mode outer_mode
,
1009 machine_mode inner_mode
)
1011 if (GET_MODE_SIZE (outer_mode
) < GET_MODE_SIZE (inner_mode
))
1012 return subreg_lowpart_offset (outer_mode
, inner_mode
);
1014 return -subreg_lowpart_offset (inner_mode
, outer_mode
);
1017 /* Generate a REG rtx for a new pseudo register of mode MODE.
1018 This pseudo is assigned the next sequential register number. */
1021 gen_reg_rtx (machine_mode mode
)
1024 unsigned int align
= GET_MODE_ALIGNMENT (mode
);
1026 gcc_assert (can_create_pseudo_p ());
1028 /* If a virtual register with bigger mode alignment is generated,
1029 increase stack alignment estimation because it might be spilled
1031 if (SUPPORTS_STACK_ALIGNMENT
1032 && crtl
->stack_alignment_estimated
< align
1033 && !crtl
->stack_realign_processed
)
1035 unsigned int min_align
= MINIMUM_ALIGNMENT (NULL
, mode
, align
);
1036 if (crtl
->stack_alignment_estimated
< min_align
)
1037 crtl
->stack_alignment_estimated
= min_align
;
1040 if (generating_concat_p
1041 && (GET_MODE_CLASS (mode
) == MODE_COMPLEX_FLOAT
1042 || GET_MODE_CLASS (mode
) == MODE_COMPLEX_INT
))
1044 /* For complex modes, don't make a single pseudo.
1045 Instead, make a CONCAT of two pseudos.
1046 This allows noncontiguous allocation of the real and imaginary parts,
1047 which makes much better code. Besides, allocating DCmode
1048 pseudos overstrains reload on some machines like the 386. */
1049 rtx realpart
, imagpart
;
1050 machine_mode partmode
= GET_MODE_INNER (mode
);
1052 realpart
= gen_reg_rtx (partmode
);
1053 imagpart
= gen_reg_rtx (partmode
);
1054 return gen_rtx_CONCAT (mode
, realpart
, imagpart
);
1057 /* Do not call gen_reg_rtx with uninitialized crtl. */
1058 gcc_assert (crtl
->emit
.regno_pointer_align_length
);
1060 /* Make sure regno_pointer_align, and regno_reg_rtx are large
1061 enough to have an element for this pseudo reg number. */
1063 if (reg_rtx_no
== crtl
->emit
.regno_pointer_align_length
)
1065 int old_size
= crtl
->emit
.regno_pointer_align_length
;
1069 tmp
= XRESIZEVEC (char, crtl
->emit
.regno_pointer_align
, old_size
* 2);
1070 memset (tmp
+ old_size
, 0, old_size
);
1071 crtl
->emit
.regno_pointer_align
= (unsigned char *) tmp
;
1073 new1
= GGC_RESIZEVEC (rtx
, regno_reg_rtx
, old_size
* 2);
1074 memset (new1
+ old_size
, 0, old_size
* sizeof (rtx
));
1075 regno_reg_rtx
= new1
;
1077 crtl
->emit
.regno_pointer_align_length
= old_size
* 2;
1080 val
= gen_raw_REG (mode
, reg_rtx_no
);
1081 regno_reg_rtx
[reg_rtx_no
++] = val
;
1085 /* Return TRUE if REG is a PARM_DECL, FALSE otherwise. */
1088 reg_is_parm_p (rtx reg
)
1092 gcc_assert (REG_P (reg
));
1093 decl
= REG_EXPR (reg
);
1094 return (decl
&& TREE_CODE (decl
) == PARM_DECL
);
1097 /* Update NEW with the same attributes as REG, but with OFFSET added
1098 to the REG_OFFSET. */
1101 update_reg_offset (rtx new_rtx
, rtx reg
, int offset
)
1103 REG_ATTRS (new_rtx
) = get_reg_attrs (REG_EXPR (reg
),
1104 REG_OFFSET (reg
) + offset
);
1107 /* Generate a register with same attributes as REG, but with OFFSET
1108 added to the REG_OFFSET. */
1111 gen_rtx_REG_offset (rtx reg
, machine_mode mode
, unsigned int regno
,
1114 rtx new_rtx
= gen_rtx_REG (mode
, regno
);
1116 update_reg_offset (new_rtx
, reg
, offset
);
1120 /* Generate a new pseudo-register with the same attributes as REG, but
1121 with OFFSET added to the REG_OFFSET. */
1124 gen_reg_rtx_offset (rtx reg
, machine_mode mode
, int offset
)
1126 rtx new_rtx
= gen_reg_rtx (mode
);
1128 update_reg_offset (new_rtx
, reg
, offset
);
1132 /* Adjust REG in-place so that it has mode MODE. It is assumed that the
1133 new register is a (possibly paradoxical) lowpart of the old one. */
1136 adjust_reg_mode (rtx reg
, machine_mode mode
)
1138 update_reg_offset (reg
, reg
, byte_lowpart_offset (mode
, GET_MODE (reg
)));
1139 PUT_MODE (reg
, mode
);
1142 /* Copy REG's attributes from X, if X has any attributes. If REG and X
1143 have different modes, REG is a (possibly paradoxical) lowpart of X. */
1146 set_reg_attrs_from_value (rtx reg
, rtx x
)
1149 bool can_be_reg_pointer
= true;
1151 /* Don't call mark_reg_pointer for incompatible pointer sign
1153 while (GET_CODE (x
) == SIGN_EXTEND
1154 || GET_CODE (x
) == ZERO_EXTEND
1155 || GET_CODE (x
) == TRUNCATE
1156 || (GET_CODE (x
) == SUBREG
&& subreg_lowpart_p (x
)))
1158 #if defined(POINTERS_EXTEND_UNSIGNED)
1159 if (((GET_CODE (x
) == SIGN_EXTEND
&& POINTERS_EXTEND_UNSIGNED
)
1160 || (GET_CODE (x
) == ZERO_EXTEND
&& ! POINTERS_EXTEND_UNSIGNED
)
1161 || (paradoxical_subreg_p (x
)
1162 && ! (SUBREG_PROMOTED_VAR_P (x
)
1163 && SUBREG_CHECK_PROMOTED_SIGN (x
,
1164 POINTERS_EXTEND_UNSIGNED
))))
1165 && !targetm
.have_ptr_extend ())
1166 can_be_reg_pointer
= false;
1171 /* Hard registers can be reused for multiple purposes within the same
1172 function, so setting REG_ATTRS, REG_POINTER and REG_POINTER_ALIGN
1173 on them is wrong. */
1174 if (HARD_REGISTER_P (reg
))
1177 offset
= byte_lowpart_offset (GET_MODE (reg
), GET_MODE (x
));
1180 if (MEM_OFFSET_KNOWN_P (x
))
1181 REG_ATTRS (reg
) = get_reg_attrs (MEM_EXPR (x
),
1182 MEM_OFFSET (x
) + offset
);
1183 if (can_be_reg_pointer
&& MEM_POINTER (x
))
1184 mark_reg_pointer (reg
, 0);
1189 update_reg_offset (reg
, x
, offset
);
1190 if (can_be_reg_pointer
&& REG_POINTER (x
))
1191 mark_reg_pointer (reg
, REGNO_POINTER_ALIGN (REGNO (x
)));
1195 /* Generate a REG rtx for a new pseudo register, copying the mode
1196 and attributes from X. */
1199 gen_reg_rtx_and_attrs (rtx x
)
1201 rtx reg
= gen_reg_rtx (GET_MODE (x
));
1202 set_reg_attrs_from_value (reg
, x
);
1206 /* Set the register attributes for registers contained in PARM_RTX.
1207 Use needed values from memory attributes of MEM. */
1210 set_reg_attrs_for_parm (rtx parm_rtx
, rtx mem
)
1212 if (REG_P (parm_rtx
))
1213 set_reg_attrs_from_value (parm_rtx
, mem
);
1214 else if (GET_CODE (parm_rtx
) == PARALLEL
)
1216 /* Check for a NULL entry in the first slot, used to indicate that the
1217 parameter goes both on the stack and in registers. */
1218 int i
= XEXP (XVECEXP (parm_rtx
, 0, 0), 0) ? 0 : 1;
1219 for (; i
< XVECLEN (parm_rtx
, 0); i
++)
1221 rtx x
= XVECEXP (parm_rtx
, 0, i
);
1222 if (REG_P (XEXP (x
, 0)))
1223 REG_ATTRS (XEXP (x
, 0))
1224 = get_reg_attrs (MEM_EXPR (mem
),
1225 INTVAL (XEXP (x
, 1)));
1230 /* Set the REG_ATTRS for registers in value X, given that X represents
1234 set_reg_attrs_for_decl_rtl (tree t
, rtx x
)
1239 if (GET_CODE (x
) == SUBREG
)
1241 gcc_assert (subreg_lowpart_p (x
));
1246 = get_reg_attrs (t
, byte_lowpart_offset (GET_MODE (x
),
1249 : TYPE_MODE (TREE_TYPE (tdecl
))));
1250 if (GET_CODE (x
) == CONCAT
)
1252 if (REG_P (XEXP (x
, 0)))
1253 REG_ATTRS (XEXP (x
, 0)) = get_reg_attrs (t
, 0);
1254 if (REG_P (XEXP (x
, 1)))
1255 REG_ATTRS (XEXP (x
, 1))
1256 = get_reg_attrs (t
, GET_MODE_UNIT_SIZE (GET_MODE (XEXP (x
, 0))));
1258 if (GET_CODE (x
) == PARALLEL
)
1262 /* Check for a NULL entry, used to indicate that the parameter goes
1263 both on the stack and in registers. */
1264 if (XEXP (XVECEXP (x
, 0, 0), 0))
1269 for (i
= start
; i
< XVECLEN (x
, 0); i
++)
1271 rtx y
= XVECEXP (x
, 0, i
);
1272 if (REG_P (XEXP (y
, 0)))
1273 REG_ATTRS (XEXP (y
, 0)) = get_reg_attrs (t
, INTVAL (XEXP (y
, 1)));
1278 /* Assign the RTX X to declaration T. */
1281 set_decl_rtl (tree t
, rtx x
)
1283 DECL_WRTL_CHECK (t
)->decl_with_rtl
.rtl
= x
;
1285 set_reg_attrs_for_decl_rtl (t
, x
);
1288 /* Assign the RTX X to parameter declaration T. BY_REFERENCE_P is true
1289 if the ABI requires the parameter to be passed by reference. */
1292 set_decl_incoming_rtl (tree t
, rtx x
, bool by_reference_p
)
1294 DECL_INCOMING_RTL (t
) = x
;
1295 if (x
&& !by_reference_p
)
1296 set_reg_attrs_for_decl_rtl (t
, x
);
1299 /* Identify REG (which may be a CONCAT) as a user register. */
1302 mark_user_reg (rtx reg
)
1304 if (GET_CODE (reg
) == CONCAT
)
1306 REG_USERVAR_P (XEXP (reg
, 0)) = 1;
1307 REG_USERVAR_P (XEXP (reg
, 1)) = 1;
1311 gcc_assert (REG_P (reg
));
1312 REG_USERVAR_P (reg
) = 1;
1316 /* Identify REG as a probable pointer register and show its alignment
1317 as ALIGN, if nonzero. */
1320 mark_reg_pointer (rtx reg
, int align
)
1322 if (! REG_POINTER (reg
))
1324 REG_POINTER (reg
) = 1;
1327 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
1329 else if (align
&& align
< REGNO_POINTER_ALIGN (REGNO (reg
)))
1330 /* We can no-longer be sure just how aligned this pointer is. */
1331 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
1334 /* Return 1 plus largest pseudo reg number used in the current function. */
1342 /* Return 1 + the largest label number used so far in the current function. */
1345 max_label_num (void)
1350 /* Return first label number used in this function (if any were used). */
1353 get_first_label_num (void)
1355 return first_label_num
;
1358 /* If the rtx for label was created during the expansion of a nested
1359 function, then first_label_num won't include this label number.
1360 Fix this now so that array indices work later. */
1363 maybe_set_first_label_num (rtx_code_label
*x
)
1365 if (CODE_LABEL_NUMBER (x
) < first_label_num
)
1366 first_label_num
= CODE_LABEL_NUMBER (x
);
1369 /* Return a value representing some low-order bits of X, where the number
1370 of low-order bits is given by MODE. Note that no conversion is done
1371 between floating-point and fixed-point values, rather, the bit
1372 representation is returned.
1374 This function handles the cases in common between gen_lowpart, below,
1375 and two variants in cse.c and combine.c. These are the cases that can
1376 be safely handled at all points in the compilation.
1378 If this is not a case we can handle, return 0. */
1381 gen_lowpart_common (machine_mode mode
, rtx x
)
1383 int msize
= GET_MODE_SIZE (mode
);
1385 machine_mode innermode
;
1387 /* Unfortunately, this routine doesn't take a parameter for the mode of X,
1388 so we have to make one up. Yuk. */
1389 innermode
= GET_MODE (x
);
1391 && msize
* BITS_PER_UNIT
<= HOST_BITS_PER_WIDE_INT
)
1392 innermode
= mode_for_size (HOST_BITS_PER_WIDE_INT
, MODE_INT
, 0);
1393 else if (innermode
== VOIDmode
)
1394 innermode
= mode_for_size (HOST_BITS_PER_DOUBLE_INT
, MODE_INT
, 0);
1396 xsize
= GET_MODE_SIZE (innermode
);
1398 gcc_assert (innermode
!= VOIDmode
&& innermode
!= BLKmode
);
1400 if (innermode
== mode
)
1403 /* MODE must occupy no more words than the mode of X. */
1404 if ((msize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
1405 > ((xsize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
))
1408 /* Don't allow generating paradoxical FLOAT_MODE subregs. */
1409 if (SCALAR_FLOAT_MODE_P (mode
) && msize
> xsize
)
1412 if ((GET_CODE (x
) == ZERO_EXTEND
|| GET_CODE (x
) == SIGN_EXTEND
)
1413 && (GET_MODE_CLASS (mode
) == MODE_INT
1414 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
))
1416 /* If we are getting the low-order part of something that has been
1417 sign- or zero-extended, we can either just use the object being
1418 extended or make a narrower extension. If we want an even smaller
1419 piece than the size of the object being extended, call ourselves
1422 This case is used mostly by combine and cse. */
1424 if (GET_MODE (XEXP (x
, 0)) == mode
)
1426 else if (msize
< GET_MODE_SIZE (GET_MODE (XEXP (x
, 0))))
1427 return gen_lowpart_common (mode
, XEXP (x
, 0));
1428 else if (msize
< xsize
)
1429 return gen_rtx_fmt_e (GET_CODE (x
), mode
, XEXP (x
, 0));
1431 else if (GET_CODE (x
) == SUBREG
|| REG_P (x
)
1432 || GET_CODE (x
) == CONCAT
|| GET_CODE (x
) == CONST_VECTOR
1433 || CONST_DOUBLE_AS_FLOAT_P (x
) || CONST_SCALAR_INT_P (x
))
1434 return lowpart_subreg (mode
, x
, innermode
);
1436 /* Otherwise, we can't do this. */
1441 gen_highpart (machine_mode mode
, rtx x
)
1443 unsigned int msize
= GET_MODE_SIZE (mode
);
1446 /* This case loses if X is a subreg. To catch bugs early,
1447 complain if an invalid MODE is used even in other cases. */
1448 gcc_assert (msize
<= UNITS_PER_WORD
1449 || msize
== (unsigned int) GET_MODE_UNIT_SIZE (GET_MODE (x
)));
1451 result
= simplify_gen_subreg (mode
, x
, GET_MODE (x
),
1452 subreg_highpart_offset (mode
, GET_MODE (x
)));
1453 gcc_assert (result
);
1455 /* simplify_gen_subreg is not guaranteed to return a valid operand for
1456 the target if we have a MEM. gen_highpart must return a valid operand,
1457 emitting code if necessary to do so. */
1460 result
= validize_mem (result
);
1461 gcc_assert (result
);
1467 /* Like gen_highpart, but accept mode of EXP operand in case EXP can
1468 be VOIDmode constant. */
1470 gen_highpart_mode (machine_mode outermode
, machine_mode innermode
, rtx exp
)
1472 if (GET_MODE (exp
) != VOIDmode
)
1474 gcc_assert (GET_MODE (exp
) == innermode
);
1475 return gen_highpart (outermode
, exp
);
1477 return simplify_gen_subreg (outermode
, exp
, innermode
,
1478 subreg_highpart_offset (outermode
, innermode
));
1481 /* Return the SUBREG_BYTE for a lowpart subreg whose outer mode has
1482 OUTER_BYTES bytes and whose inner mode has INNER_BYTES bytes. */
1485 subreg_size_lowpart_offset (unsigned int outer_bytes
, unsigned int inner_bytes
)
1487 if (outer_bytes
> inner_bytes
)
1488 /* Paradoxical subregs always have a SUBREG_BYTE of 0. */
1491 if (BYTES_BIG_ENDIAN
&& WORDS_BIG_ENDIAN
)
1492 return inner_bytes
- outer_bytes
;
1493 else if (!BYTES_BIG_ENDIAN
&& !WORDS_BIG_ENDIAN
)
1496 return subreg_size_offset_from_lsb (outer_bytes
, inner_bytes
, 0);
1499 /* Return the SUBREG_BYTE for a highpart subreg whose outer mode has
1500 OUTER_BYTES bytes and whose inner mode has INNER_BYTES bytes. */
1503 subreg_size_highpart_offset (unsigned int outer_bytes
,
1504 unsigned int inner_bytes
)
1506 gcc_assert (inner_bytes
>= outer_bytes
);
1508 if (BYTES_BIG_ENDIAN
&& WORDS_BIG_ENDIAN
)
1510 else if (!BYTES_BIG_ENDIAN
&& !WORDS_BIG_ENDIAN
)
1511 return inner_bytes
- outer_bytes
;
1513 return subreg_size_offset_from_lsb (outer_bytes
, inner_bytes
,
1514 (inner_bytes
- outer_bytes
)
1518 /* Return 1 iff X, assumed to be a SUBREG,
1519 refers to the least significant part of its containing reg.
1520 If X is not a SUBREG, always return 1 (it is its own low part!). */
1523 subreg_lowpart_p (const_rtx x
)
1525 if (GET_CODE (x
) != SUBREG
)
1527 else if (GET_MODE (SUBREG_REG (x
)) == VOIDmode
)
1530 return (subreg_lowpart_offset (GET_MODE (x
), GET_MODE (SUBREG_REG (x
)))
1531 == SUBREG_BYTE (x
));
1534 /* Return true if X is a paradoxical subreg, false otherwise. */
1536 paradoxical_subreg_p (const_rtx x
)
1538 if (GET_CODE (x
) != SUBREG
)
1540 return (GET_MODE_PRECISION (GET_MODE (x
))
1541 > GET_MODE_PRECISION (GET_MODE (SUBREG_REG (x
))));
1544 /* Return subword OFFSET of operand OP.
1545 The word number, OFFSET, is interpreted as the word number starting
1546 at the low-order address. OFFSET 0 is the low-order word if not
1547 WORDS_BIG_ENDIAN, otherwise it is the high-order word.
1549 If we cannot extract the required word, we return zero. Otherwise,
1550 an rtx corresponding to the requested word will be returned.
1552 VALIDATE_ADDRESS is nonzero if the address should be validated. Before
1553 reload has completed, a valid address will always be returned. After
1554 reload, if a valid address cannot be returned, we return zero.
1556 If VALIDATE_ADDRESS is zero, we simply form the required address; validating
1557 it is the responsibility of the caller.
1559 MODE is the mode of OP in case it is a CONST_INT.
1561 ??? This is still rather broken for some cases. The problem for the
1562 moment is that all callers of this thing provide no 'goal mode' to
1563 tell us to work with. This exists because all callers were written
1564 in a word based SUBREG world.
1565 Now use of this function can be deprecated by simplify_subreg in most
1570 operand_subword (rtx op
, unsigned int offset
, int validate_address
, machine_mode mode
)
1572 if (mode
== VOIDmode
)
1573 mode
= GET_MODE (op
);
1575 gcc_assert (mode
!= VOIDmode
);
1577 /* If OP is narrower than a word, fail. */
1579 && (GET_MODE_SIZE (mode
) < UNITS_PER_WORD
))
1582 /* If we want a word outside OP, return zero. */
1584 && (offset
+ 1) * UNITS_PER_WORD
> GET_MODE_SIZE (mode
))
1587 /* Form a new MEM at the requested address. */
1590 rtx new_rtx
= adjust_address_nv (op
, word_mode
, offset
* UNITS_PER_WORD
);
1592 if (! validate_address
)
1595 else if (reload_completed
)
1597 if (! strict_memory_address_addr_space_p (word_mode
,
1599 MEM_ADDR_SPACE (op
)))
1603 return replace_equiv_address (new_rtx
, XEXP (new_rtx
, 0));
1606 /* Rest can be handled by simplify_subreg. */
1607 return simplify_gen_subreg (word_mode
, op
, mode
, (offset
* UNITS_PER_WORD
));
1610 /* Similar to `operand_subword', but never return 0. If we can't
1611 extract the required subword, put OP into a register and try again.
1612 The second attempt must succeed. We always validate the address in
1615 MODE is the mode of OP, in case it is CONST_INT. */
1618 operand_subword_force (rtx op
, unsigned int offset
, machine_mode mode
)
1620 rtx result
= operand_subword (op
, offset
, 1, mode
);
1625 if (mode
!= BLKmode
&& mode
!= VOIDmode
)
1627 /* If this is a register which can not be accessed by words, copy it
1628 to a pseudo register. */
1630 op
= copy_to_reg (op
);
1632 op
= force_reg (mode
, op
);
1635 result
= operand_subword (op
, offset
, 1, mode
);
1636 gcc_assert (result
);
1641 /* Returns 1 if both MEM_EXPR can be considered equal
1645 mem_expr_equal_p (const_tree expr1
, const_tree expr2
)
1650 if (! expr1
|| ! expr2
)
1653 if (TREE_CODE (expr1
) != TREE_CODE (expr2
))
1656 return operand_equal_p (expr1
, expr2
, 0);
1659 /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
1660 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
1664 get_mem_align_offset (rtx mem
, unsigned int align
)
1667 unsigned HOST_WIDE_INT offset
;
1669 /* This function can't use
1670 if (!MEM_EXPR (mem) || !MEM_OFFSET_KNOWN_P (mem)
1671 || (MAX (MEM_ALIGN (mem),
1672 MAX (align, get_object_alignment (MEM_EXPR (mem))))
1676 return (- MEM_OFFSET (mem)) & (align / BITS_PER_UNIT - 1);
1678 - COMPONENT_REFs in MEM_EXPR can have NULL first operand,
1679 for <variable>. get_inner_reference doesn't handle it and
1680 even if it did, the alignment in that case needs to be determined
1681 from DECL_FIELD_CONTEXT's TYPE_ALIGN.
1682 - it would do suboptimal job for COMPONENT_REFs, even if MEM_EXPR
1683 isn't sufficiently aligned, the object it is in might be. */
1684 gcc_assert (MEM_P (mem
));
1685 expr
= MEM_EXPR (mem
);
1686 if (expr
== NULL_TREE
|| !MEM_OFFSET_KNOWN_P (mem
))
1689 offset
= MEM_OFFSET (mem
);
1692 if (DECL_ALIGN (expr
) < align
)
1695 else if (INDIRECT_REF_P (expr
))
1697 if (TYPE_ALIGN (TREE_TYPE (expr
)) < (unsigned int) align
)
1700 else if (TREE_CODE (expr
) == COMPONENT_REF
)
1704 tree inner
= TREE_OPERAND (expr
, 0);
1705 tree field
= TREE_OPERAND (expr
, 1);
1706 tree byte_offset
= component_ref_field_offset (expr
);
1707 tree bit_offset
= DECL_FIELD_BIT_OFFSET (field
);
1710 || !tree_fits_uhwi_p (byte_offset
)
1711 || !tree_fits_uhwi_p (bit_offset
))
1714 offset
+= tree_to_uhwi (byte_offset
);
1715 offset
+= tree_to_uhwi (bit_offset
) / BITS_PER_UNIT
;
1717 if (inner
== NULL_TREE
)
1719 if (TYPE_ALIGN (DECL_FIELD_CONTEXT (field
))
1720 < (unsigned int) align
)
1724 else if (DECL_P (inner
))
1726 if (DECL_ALIGN (inner
) < align
)
1730 else if (TREE_CODE (inner
) != COMPONENT_REF
)
1738 return offset
& ((align
/ BITS_PER_UNIT
) - 1);
1741 /* Given REF (a MEM) and T, either the type of X or the expression
1742 corresponding to REF, set the memory attributes. OBJECTP is nonzero
1743 if we are making a new object of this type. BITPOS is nonzero if
1744 there is an offset outstanding on T that will be applied later. */
1747 set_mem_attributes_minus_bitpos (rtx ref
, tree t
, int objectp
,
1748 HOST_WIDE_INT bitpos
)
1750 HOST_WIDE_INT apply_bitpos
= 0;
1752 struct mem_attrs attrs
, *defattrs
, *refattrs
;
1755 /* It can happen that type_for_mode was given a mode for which there
1756 is no language-level type. In which case it returns NULL, which
1761 type
= TYPE_P (t
) ? t
: TREE_TYPE (t
);
1762 if (type
== error_mark_node
)
1765 /* If we have already set DECL_RTL = ref, get_alias_set will get the
1766 wrong answer, as it assumes that DECL_RTL already has the right alias
1767 info. Callers should not set DECL_RTL until after the call to
1768 set_mem_attributes. */
1769 gcc_assert (!DECL_P (t
) || ref
!= DECL_RTL_IF_SET (t
));
1771 memset (&attrs
, 0, sizeof (attrs
));
1773 /* Get the alias set from the expression or type (perhaps using a
1774 front-end routine) and use it. */
1775 attrs
.alias
= get_alias_set (t
);
1777 MEM_VOLATILE_P (ref
) |= TYPE_VOLATILE (type
);
1778 MEM_POINTER (ref
) = POINTER_TYPE_P (type
);
1780 /* Default values from pre-existing memory attributes if present. */
1781 refattrs
= MEM_ATTRS (ref
);
1784 /* ??? Can this ever happen? Calling this routine on a MEM that
1785 already carries memory attributes should probably be invalid. */
1786 attrs
.expr
= refattrs
->expr
;
1787 attrs
.offset_known_p
= refattrs
->offset_known_p
;
1788 attrs
.offset
= refattrs
->offset
;
1789 attrs
.size_known_p
= refattrs
->size_known_p
;
1790 attrs
.size
= refattrs
->size
;
1791 attrs
.align
= refattrs
->align
;
1794 /* Otherwise, default values from the mode of the MEM reference. */
1797 defattrs
= mode_mem_attrs
[(int) GET_MODE (ref
)];
1798 gcc_assert (!defattrs
->expr
);
1799 gcc_assert (!defattrs
->offset_known_p
);
1801 /* Respect mode size. */
1802 attrs
.size_known_p
= defattrs
->size_known_p
;
1803 attrs
.size
= defattrs
->size
;
1804 /* ??? Is this really necessary? We probably should always get
1805 the size from the type below. */
1807 /* Respect mode alignment for STRICT_ALIGNMENT targets if T is a type;
1808 if T is an object, always compute the object alignment below. */
1810 attrs
.align
= defattrs
->align
;
1812 attrs
.align
= BITS_PER_UNIT
;
1813 /* ??? If T is a type, respecting mode alignment may *also* be wrong
1814 e.g. if the type carries an alignment attribute. Should we be
1815 able to simply always use TYPE_ALIGN? */
1818 /* We can set the alignment from the type if we are making an object or if
1819 this is an INDIRECT_REF. */
1820 if (objectp
|| TREE_CODE (t
) == INDIRECT_REF
)
1821 attrs
.align
= MAX (attrs
.align
, TYPE_ALIGN (type
));
1823 /* If the size is known, we can set that. */
1824 tree new_size
= TYPE_SIZE_UNIT (type
);
1826 /* The address-space is that of the type. */
1827 as
= TYPE_ADDR_SPACE (type
);
1829 /* If T is not a type, we may be able to deduce some more information about
1835 if (TREE_THIS_VOLATILE (t
))
1836 MEM_VOLATILE_P (ref
) = 1;
1838 /* Now remove any conversions: they don't change what the underlying
1839 object is. Likewise for SAVE_EXPR. */
1840 while (CONVERT_EXPR_P (t
)
1841 || TREE_CODE (t
) == VIEW_CONVERT_EXPR
1842 || TREE_CODE (t
) == SAVE_EXPR
)
1843 t
= TREE_OPERAND (t
, 0);
1845 /* Note whether this expression can trap. */
1846 MEM_NOTRAP_P (ref
) = !tree_could_trap_p (t
);
1848 base
= get_base_address (t
);
1852 && TREE_READONLY (base
)
1853 && (TREE_STATIC (base
) || DECL_EXTERNAL (base
))
1854 && !TREE_THIS_VOLATILE (base
))
1855 MEM_READONLY_P (ref
) = 1;
1857 /* Mark static const strings readonly as well. */
1858 if (TREE_CODE (base
) == STRING_CST
1859 && TREE_READONLY (base
)
1860 && TREE_STATIC (base
))
1861 MEM_READONLY_P (ref
) = 1;
1863 /* Address-space information is on the base object. */
1864 if (TREE_CODE (base
) == MEM_REF
1865 || TREE_CODE (base
) == TARGET_MEM_REF
)
1866 as
= TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (base
,
1869 as
= TYPE_ADDR_SPACE (TREE_TYPE (base
));
1872 /* If this expression uses it's parent's alias set, mark it such
1873 that we won't change it. */
1874 if (component_uses_parent_alias_set_from (t
) != NULL_TREE
)
1875 MEM_KEEP_ALIAS_SET_P (ref
) = 1;
1877 /* If this is a decl, set the attributes of the MEM from it. */
1881 attrs
.offset_known_p
= true;
1883 apply_bitpos
= bitpos
;
1884 new_size
= DECL_SIZE_UNIT (t
);
1887 /* ??? If we end up with a constant here do record a MEM_EXPR. */
1888 else if (CONSTANT_CLASS_P (t
))
1891 /* If this is a field reference, record it. */
1892 else if (TREE_CODE (t
) == COMPONENT_REF
)
1895 attrs
.offset_known_p
= true;
1897 apply_bitpos
= bitpos
;
1898 if (DECL_BIT_FIELD (TREE_OPERAND (t
, 1)))
1899 new_size
= DECL_SIZE_UNIT (TREE_OPERAND (t
, 1));
1902 /* If this is an array reference, look for an outer field reference. */
1903 else if (TREE_CODE (t
) == ARRAY_REF
)
1905 tree off_tree
= size_zero_node
;
1906 /* We can't modify t, because we use it at the end of the
1912 tree index
= TREE_OPERAND (t2
, 1);
1913 tree low_bound
= array_ref_low_bound (t2
);
1914 tree unit_size
= array_ref_element_size (t2
);
1916 /* We assume all arrays have sizes that are a multiple of a byte.
1917 First subtract the lower bound, if any, in the type of the
1918 index, then convert to sizetype and multiply by the size of
1919 the array element. */
1920 if (! integer_zerop (low_bound
))
1921 index
= fold_build2 (MINUS_EXPR
, TREE_TYPE (index
),
1924 off_tree
= size_binop (PLUS_EXPR
,
1925 size_binop (MULT_EXPR
,
1926 fold_convert (sizetype
,
1930 t2
= TREE_OPERAND (t2
, 0);
1932 while (TREE_CODE (t2
) == ARRAY_REF
);
1935 || TREE_CODE (t2
) == COMPONENT_REF
)
1938 attrs
.offset_known_p
= false;
1939 if (tree_fits_uhwi_p (off_tree
))
1941 attrs
.offset_known_p
= true;
1942 attrs
.offset
= tree_to_uhwi (off_tree
);
1943 apply_bitpos
= bitpos
;
1946 /* Else do not record a MEM_EXPR. */
1949 /* If this is an indirect reference, record it. */
1950 else if (TREE_CODE (t
) == MEM_REF
1951 || TREE_CODE (t
) == TARGET_MEM_REF
)
1954 attrs
.offset_known_p
= true;
1956 apply_bitpos
= bitpos
;
1959 /* Compute the alignment. */
1960 unsigned int obj_align
;
1961 unsigned HOST_WIDE_INT obj_bitpos
;
1962 get_object_alignment_1 (t
, &obj_align
, &obj_bitpos
);
1963 obj_bitpos
= (obj_bitpos
- bitpos
) & (obj_align
- 1);
1964 if (obj_bitpos
!= 0)
1965 obj_align
= least_bit_hwi (obj_bitpos
);
1966 attrs
.align
= MAX (attrs
.align
, obj_align
);
1969 if (tree_fits_uhwi_p (new_size
))
1971 attrs
.size_known_p
= true;
1972 attrs
.size
= tree_to_uhwi (new_size
);
1975 /* If we modified OFFSET based on T, then subtract the outstanding
1976 bit position offset. Similarly, increase the size of the accessed
1977 object to contain the negative offset. */
1980 gcc_assert (attrs
.offset_known_p
);
1981 attrs
.offset
-= apply_bitpos
/ BITS_PER_UNIT
;
1982 if (attrs
.size_known_p
)
1983 attrs
.size
+= apply_bitpos
/ BITS_PER_UNIT
;
1986 /* Now set the attributes we computed above. */
1987 attrs
.addrspace
= as
;
1988 set_mem_attrs (ref
, &attrs
);
1992 set_mem_attributes (rtx ref
, tree t
, int objectp
)
1994 set_mem_attributes_minus_bitpos (ref
, t
, objectp
, 0);
1997 /* Set the alias set of MEM to SET. */
2000 set_mem_alias_set (rtx mem
, alias_set_type set
)
2002 struct mem_attrs attrs
;
2004 /* If the new and old alias sets don't conflict, something is wrong. */
2005 gcc_checking_assert (alias_sets_conflict_p (set
, MEM_ALIAS_SET (mem
)));
2006 attrs
= *get_mem_attrs (mem
);
2008 set_mem_attrs (mem
, &attrs
);
2011 /* Set the address space of MEM to ADDRSPACE (target-defined). */
2014 set_mem_addr_space (rtx mem
, addr_space_t addrspace
)
2016 struct mem_attrs attrs
;
2018 attrs
= *get_mem_attrs (mem
);
2019 attrs
.addrspace
= addrspace
;
2020 set_mem_attrs (mem
, &attrs
);
2023 /* Set the alignment of MEM to ALIGN bits. */
2026 set_mem_align (rtx mem
, unsigned int align
)
2028 struct mem_attrs attrs
;
2030 attrs
= *get_mem_attrs (mem
);
2031 attrs
.align
= align
;
2032 set_mem_attrs (mem
, &attrs
);
2035 /* Set the expr for MEM to EXPR. */
2038 set_mem_expr (rtx mem
, tree expr
)
2040 struct mem_attrs attrs
;
2042 attrs
= *get_mem_attrs (mem
);
2044 set_mem_attrs (mem
, &attrs
);
2047 /* Set the offset of MEM to OFFSET. */
2050 set_mem_offset (rtx mem
, HOST_WIDE_INT offset
)
2052 struct mem_attrs attrs
;
2054 attrs
= *get_mem_attrs (mem
);
2055 attrs
.offset_known_p
= true;
2056 attrs
.offset
= offset
;
2057 set_mem_attrs (mem
, &attrs
);
2060 /* Clear the offset of MEM. */
2063 clear_mem_offset (rtx mem
)
2065 struct mem_attrs attrs
;
2067 attrs
= *get_mem_attrs (mem
);
2068 attrs
.offset_known_p
= false;
2069 set_mem_attrs (mem
, &attrs
);
2072 /* Set the size of MEM to SIZE. */
2075 set_mem_size (rtx mem
, HOST_WIDE_INT size
)
2077 struct mem_attrs attrs
;
2079 attrs
= *get_mem_attrs (mem
);
2080 attrs
.size_known_p
= true;
2082 set_mem_attrs (mem
, &attrs
);
2085 /* Clear the size of MEM. */
2088 clear_mem_size (rtx mem
)
2090 struct mem_attrs attrs
;
2092 attrs
= *get_mem_attrs (mem
);
2093 attrs
.size_known_p
= false;
2094 set_mem_attrs (mem
, &attrs
);
2097 /* Return a memory reference like MEMREF, but with its mode changed to MODE
2098 and its address changed to ADDR. (VOIDmode means don't change the mode.
2099 NULL for ADDR means don't change the address.) VALIDATE is nonzero if the
2100 returned memory location is required to be valid. INPLACE is true if any
2101 changes can be made directly to MEMREF or false if MEMREF must be treated
2104 The memory attributes are not changed. */
2107 change_address_1 (rtx memref
, machine_mode mode
, rtx addr
, int validate
,
2113 gcc_assert (MEM_P (memref
));
2114 as
= MEM_ADDR_SPACE (memref
);
2115 if (mode
== VOIDmode
)
2116 mode
= GET_MODE (memref
);
2118 addr
= XEXP (memref
, 0);
2119 if (mode
== GET_MODE (memref
) && addr
== XEXP (memref
, 0)
2120 && (!validate
|| memory_address_addr_space_p (mode
, addr
, as
)))
2123 /* Don't validate address for LRA. LRA can make the address valid
2124 by itself in most efficient way. */
2125 if (validate
&& !lra_in_progress
)
2127 if (reload_in_progress
|| reload_completed
)
2128 gcc_assert (memory_address_addr_space_p (mode
, addr
, as
));
2130 addr
= memory_address_addr_space (mode
, addr
, as
);
2133 if (rtx_equal_p (addr
, XEXP (memref
, 0)) && mode
== GET_MODE (memref
))
2138 XEXP (memref
, 0) = addr
;
2142 new_rtx
= gen_rtx_MEM (mode
, addr
);
2143 MEM_COPY_ATTRIBUTES (new_rtx
, memref
);
2147 /* Like change_address_1 with VALIDATE nonzero, but we are not saying in what
2148 way we are changing MEMREF, so we only preserve the alias set. */
2151 change_address (rtx memref
, machine_mode mode
, rtx addr
)
2153 rtx new_rtx
= change_address_1 (memref
, mode
, addr
, 1, false);
2154 machine_mode mmode
= GET_MODE (new_rtx
);
2155 struct mem_attrs attrs
, *defattrs
;
2157 attrs
= *get_mem_attrs (memref
);
2158 defattrs
= mode_mem_attrs
[(int) mmode
];
2159 attrs
.expr
= NULL_TREE
;
2160 attrs
.offset_known_p
= false;
2161 attrs
.size_known_p
= defattrs
->size_known_p
;
2162 attrs
.size
= defattrs
->size
;
2163 attrs
.align
= defattrs
->align
;
2165 /* If there are no changes, just return the original memory reference. */
2166 if (new_rtx
== memref
)
2168 if (mem_attrs_eq_p (get_mem_attrs (memref
), &attrs
))
2171 new_rtx
= gen_rtx_MEM (mmode
, XEXP (memref
, 0));
2172 MEM_COPY_ATTRIBUTES (new_rtx
, memref
);
2175 set_mem_attrs (new_rtx
, &attrs
);
2179 /* Return a memory reference like MEMREF, but with its mode changed
2180 to MODE and its address offset by OFFSET bytes. If VALIDATE is
2181 nonzero, the memory address is forced to be valid.
2182 If ADJUST_ADDRESS is zero, OFFSET is only used to update MEM_ATTRS
2183 and the caller is responsible for adjusting MEMREF base register.
2184 If ADJUST_OBJECT is zero, the underlying object associated with the
2185 memory reference is left unchanged and the caller is responsible for
2186 dealing with it. Otherwise, if the new memory reference is outside
2187 the underlying object, even partially, then the object is dropped.
2188 SIZE, if nonzero, is the size of an access in cases where MODE
2189 has no inherent size. */
2192 adjust_address_1 (rtx memref
, machine_mode mode
, HOST_WIDE_INT offset
,
2193 int validate
, int adjust_address
, int adjust_object
,
2196 rtx addr
= XEXP (memref
, 0);
2198 machine_mode address_mode
;
2200 struct mem_attrs attrs
= *get_mem_attrs (memref
), *defattrs
;
2201 unsigned HOST_WIDE_INT max_align
;
2202 #ifdef POINTERS_EXTEND_UNSIGNED
2203 machine_mode pointer_mode
2204 = targetm
.addr_space
.pointer_mode (attrs
.addrspace
);
2207 /* VOIDmode means no mode change for change_address_1. */
2208 if (mode
== VOIDmode
)
2209 mode
= GET_MODE (memref
);
2211 /* Take the size of non-BLKmode accesses from the mode. */
2212 defattrs
= mode_mem_attrs
[(int) mode
];
2213 if (defattrs
->size_known_p
)
2214 size
= defattrs
->size
;
2216 /* If there are no changes, just return the original memory reference. */
2217 if (mode
== GET_MODE (memref
) && !offset
2218 && (size
== 0 || (attrs
.size_known_p
&& attrs
.size
== size
))
2219 && (!validate
|| memory_address_addr_space_p (mode
, addr
,
2223 /* ??? Prefer to create garbage instead of creating shared rtl.
2224 This may happen even if offset is nonzero -- consider
2225 (plus (plus reg reg) const_int) -- so do this always. */
2226 addr
= copy_rtx (addr
);
2228 /* Convert a possibly large offset to a signed value within the
2229 range of the target address space. */
2230 address_mode
= get_address_mode (memref
);
2231 pbits
= GET_MODE_BITSIZE (address_mode
);
2232 if (HOST_BITS_PER_WIDE_INT
> pbits
)
2234 int shift
= HOST_BITS_PER_WIDE_INT
- pbits
;
2235 offset
= (((HOST_WIDE_INT
) ((unsigned HOST_WIDE_INT
) offset
<< shift
))
2241 /* If MEMREF is a LO_SUM and the offset is within the alignment of the
2242 object, we can merge it into the LO_SUM. */
2243 if (GET_MODE (memref
) != BLKmode
&& GET_CODE (addr
) == LO_SUM
2245 && (unsigned HOST_WIDE_INT
) offset
2246 < GET_MODE_ALIGNMENT (GET_MODE (memref
)) / BITS_PER_UNIT
)
2247 addr
= gen_rtx_LO_SUM (address_mode
, XEXP (addr
, 0),
2248 plus_constant (address_mode
,
2249 XEXP (addr
, 1), offset
));
2250 #ifdef POINTERS_EXTEND_UNSIGNED
2251 /* If MEMREF is a ZERO_EXTEND from pointer_mode and the offset is valid
2252 in that mode, we merge it into the ZERO_EXTEND. We take advantage of
2253 the fact that pointers are not allowed to overflow. */
2254 else if (POINTERS_EXTEND_UNSIGNED
> 0
2255 && GET_CODE (addr
) == ZERO_EXTEND
2256 && GET_MODE (XEXP (addr
, 0)) == pointer_mode
2257 && trunc_int_for_mode (offset
, pointer_mode
) == offset
)
2258 addr
= gen_rtx_ZERO_EXTEND (address_mode
,
2259 plus_constant (pointer_mode
,
2260 XEXP (addr
, 0), offset
));
2263 addr
= plus_constant (address_mode
, addr
, offset
);
2266 new_rtx
= change_address_1 (memref
, mode
, addr
, validate
, false);
2268 /* If the address is a REG, change_address_1 rightfully returns memref,
2269 but this would destroy memref's MEM_ATTRS. */
2270 if (new_rtx
== memref
&& offset
!= 0)
2271 new_rtx
= copy_rtx (new_rtx
);
2273 /* Conservatively drop the object if we don't know where we start from. */
2274 if (adjust_object
&& (!attrs
.offset_known_p
|| !attrs
.size_known_p
))
2276 attrs
.expr
= NULL_TREE
;
2280 /* Compute the new values of the memory attributes due to this adjustment.
2281 We add the offsets and update the alignment. */
2282 if (attrs
.offset_known_p
)
2284 attrs
.offset
+= offset
;
2286 /* Drop the object if the new left end is not within its bounds. */
2287 if (adjust_object
&& attrs
.offset
< 0)
2289 attrs
.expr
= NULL_TREE
;
2294 /* Compute the new alignment by taking the MIN of the alignment and the
2295 lowest-order set bit in OFFSET, but don't change the alignment if OFFSET
2299 max_align
= least_bit_hwi (offset
) * BITS_PER_UNIT
;
2300 attrs
.align
= MIN (attrs
.align
, max_align
);
2305 /* Drop the object if the new right end is not within its bounds. */
2306 if (adjust_object
&& (offset
+ size
) > attrs
.size
)
2308 attrs
.expr
= NULL_TREE
;
2311 attrs
.size_known_p
= true;
2314 else if (attrs
.size_known_p
)
2316 gcc_assert (!adjust_object
);
2317 attrs
.size
-= offset
;
2318 /* ??? The store_by_pieces machinery generates negative sizes,
2319 so don't assert for that here. */
2322 set_mem_attrs (new_rtx
, &attrs
);
2327 /* Return a memory reference like MEMREF, but with its mode changed
2328 to MODE and its address changed to ADDR, which is assumed to be
2329 MEMREF offset by OFFSET bytes. If VALIDATE is
2330 nonzero, the memory address is forced to be valid. */
2333 adjust_automodify_address_1 (rtx memref
, machine_mode mode
, rtx addr
,
2334 HOST_WIDE_INT offset
, int validate
)
2336 memref
= change_address_1 (memref
, VOIDmode
, addr
, validate
, false);
2337 return adjust_address_1 (memref
, mode
, offset
, validate
, 0, 0, 0);
2340 /* Return a memory reference like MEMREF, but whose address is changed by
2341 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
2342 known to be in OFFSET (possibly 1). */
2345 offset_address (rtx memref
, rtx offset
, unsigned HOST_WIDE_INT pow2
)
2347 rtx new_rtx
, addr
= XEXP (memref
, 0);
2348 machine_mode address_mode
;
2349 struct mem_attrs attrs
, *defattrs
;
2351 attrs
= *get_mem_attrs (memref
);
2352 address_mode
= get_address_mode (memref
);
2353 new_rtx
= simplify_gen_binary (PLUS
, address_mode
, addr
, offset
);
2355 /* At this point we don't know _why_ the address is invalid. It
2356 could have secondary memory references, multiplies or anything.
2358 However, if we did go and rearrange things, we can wind up not
2359 being able to recognize the magic around pic_offset_table_rtx.
2360 This stuff is fragile, and is yet another example of why it is
2361 bad to expose PIC machinery too early. */
2362 if (! memory_address_addr_space_p (GET_MODE (memref
), new_rtx
,
2364 && GET_CODE (addr
) == PLUS
2365 && XEXP (addr
, 0) == pic_offset_table_rtx
)
2367 addr
= force_reg (GET_MODE (addr
), addr
);
2368 new_rtx
= simplify_gen_binary (PLUS
, address_mode
, addr
, offset
);
2371 update_temp_slot_address (XEXP (memref
, 0), new_rtx
);
2372 new_rtx
= change_address_1 (memref
, VOIDmode
, new_rtx
, 1, false);
2374 /* If there are no changes, just return the original memory reference. */
2375 if (new_rtx
== memref
)
2378 /* Update the alignment to reflect the offset. Reset the offset, which
2380 defattrs
= mode_mem_attrs
[(int) GET_MODE (new_rtx
)];
2381 attrs
.offset_known_p
= false;
2382 attrs
.size_known_p
= defattrs
->size_known_p
;
2383 attrs
.size
= defattrs
->size
;
2384 attrs
.align
= MIN (attrs
.align
, pow2
* BITS_PER_UNIT
);
2385 set_mem_attrs (new_rtx
, &attrs
);
2389 /* Return a memory reference like MEMREF, but with its address changed to
2390 ADDR. The caller is asserting that the actual piece of memory pointed
2391 to is the same, just the form of the address is being changed, such as
2392 by putting something into a register. INPLACE is true if any changes
2393 can be made directly to MEMREF or false if MEMREF must be treated as
2397 replace_equiv_address (rtx memref
, rtx addr
, bool inplace
)
2399 /* change_address_1 copies the memory attribute structure without change
2400 and that's exactly what we want here. */
2401 update_temp_slot_address (XEXP (memref
, 0), addr
);
2402 return change_address_1 (memref
, VOIDmode
, addr
, 1, inplace
);
2405 /* Likewise, but the reference is not required to be valid. */
2408 replace_equiv_address_nv (rtx memref
, rtx addr
, bool inplace
)
2410 return change_address_1 (memref
, VOIDmode
, addr
, 0, inplace
);
2413 /* Return a memory reference like MEMREF, but with its mode widened to
2414 MODE and offset by OFFSET. This would be used by targets that e.g.
2415 cannot issue QImode memory operations and have to use SImode memory
2416 operations plus masking logic. */
2419 widen_memory_access (rtx memref
, machine_mode mode
, HOST_WIDE_INT offset
)
2421 rtx new_rtx
= adjust_address_1 (memref
, mode
, offset
, 1, 1, 0, 0);
2422 struct mem_attrs attrs
;
2423 unsigned int size
= GET_MODE_SIZE (mode
);
2425 /* If there are no changes, just return the original memory reference. */
2426 if (new_rtx
== memref
)
2429 attrs
= *get_mem_attrs (new_rtx
);
2431 /* If we don't know what offset we were at within the expression, then
2432 we can't know if we've overstepped the bounds. */
2433 if (! attrs
.offset_known_p
)
2434 attrs
.expr
= NULL_TREE
;
2438 if (TREE_CODE (attrs
.expr
) == COMPONENT_REF
)
2440 tree field
= TREE_OPERAND (attrs
.expr
, 1);
2441 tree offset
= component_ref_field_offset (attrs
.expr
);
2443 if (! DECL_SIZE_UNIT (field
))
2445 attrs
.expr
= NULL_TREE
;
2449 /* Is the field at least as large as the access? If so, ok,
2450 otherwise strip back to the containing structure. */
2451 if (TREE_CODE (DECL_SIZE_UNIT (field
)) == INTEGER_CST
2452 && compare_tree_int (DECL_SIZE_UNIT (field
), size
) >= 0
2453 && attrs
.offset
>= 0)
2456 if (! tree_fits_uhwi_p (offset
))
2458 attrs
.expr
= NULL_TREE
;
2462 attrs
.expr
= TREE_OPERAND (attrs
.expr
, 0);
2463 attrs
.offset
+= tree_to_uhwi (offset
);
2464 attrs
.offset
+= (tree_to_uhwi (DECL_FIELD_BIT_OFFSET (field
))
2467 /* Similarly for the decl. */
2468 else if (DECL_P (attrs
.expr
)
2469 && DECL_SIZE_UNIT (attrs
.expr
)
2470 && TREE_CODE (DECL_SIZE_UNIT (attrs
.expr
)) == INTEGER_CST
2471 && compare_tree_int (DECL_SIZE_UNIT (attrs
.expr
), size
) >= 0
2472 && (! attrs
.offset_known_p
|| attrs
.offset
>= 0))
2476 /* The widened memory access overflows the expression, which means
2477 that it could alias another expression. Zap it. */
2478 attrs
.expr
= NULL_TREE
;
2484 attrs
.offset_known_p
= false;
2486 /* The widened memory may alias other stuff, so zap the alias set. */
2487 /* ??? Maybe use get_alias_set on any remaining expression. */
2489 attrs
.size_known_p
= true;
2491 set_mem_attrs (new_rtx
, &attrs
);
2495 /* A fake decl that is used as the MEM_EXPR of spill slots. */
2496 static GTY(()) tree spill_slot_decl
;
2499 get_spill_slot_decl (bool force_build_p
)
2501 tree d
= spill_slot_decl
;
2503 struct mem_attrs attrs
;
2505 if (d
|| !force_build_p
)
2508 d
= build_decl (DECL_SOURCE_LOCATION (current_function_decl
),
2509 VAR_DECL
, get_identifier ("%sfp"), void_type_node
);
2510 DECL_ARTIFICIAL (d
) = 1;
2511 DECL_IGNORED_P (d
) = 1;
2513 spill_slot_decl
= d
;
2515 rd
= gen_rtx_MEM (BLKmode
, frame_pointer_rtx
);
2516 MEM_NOTRAP_P (rd
) = 1;
2517 attrs
= *mode_mem_attrs
[(int) BLKmode
];
2518 attrs
.alias
= new_alias_set ();
2520 set_mem_attrs (rd
, &attrs
);
2521 SET_DECL_RTL (d
, rd
);
2526 /* Given MEM, a result from assign_stack_local, fill in the memory
2527 attributes as appropriate for a register allocator spill slot.
2528 These slots are not aliasable by other memory. We arrange for
2529 them all to use a single MEM_EXPR, so that the aliasing code can
2530 work properly in the case of shared spill slots. */
2533 set_mem_attrs_for_spill (rtx mem
)
2535 struct mem_attrs attrs
;
2538 attrs
= *get_mem_attrs (mem
);
2539 attrs
.expr
= get_spill_slot_decl (true);
2540 attrs
.alias
= MEM_ALIAS_SET (DECL_RTL (attrs
.expr
));
2541 attrs
.addrspace
= ADDR_SPACE_GENERIC
;
2543 /* We expect the incoming memory to be of the form:
2544 (mem:MODE (plus (reg sfp) (const_int offset)))
2545 with perhaps the plus missing for offset = 0. */
2546 addr
= XEXP (mem
, 0);
2547 attrs
.offset_known_p
= true;
2549 if (GET_CODE (addr
) == PLUS
2550 && CONST_INT_P (XEXP (addr
, 1)))
2551 attrs
.offset
= INTVAL (XEXP (addr
, 1));
2553 set_mem_attrs (mem
, &attrs
);
2554 MEM_NOTRAP_P (mem
) = 1;
2557 /* Return a newly created CODE_LABEL rtx with a unique label number. */
2560 gen_label_rtx (void)
2562 return as_a
<rtx_code_label
*> (
2563 gen_rtx_CODE_LABEL (VOIDmode
, NULL_RTX
, NULL_RTX
,
2564 NULL
, label_num
++, NULL
));
2567 /* For procedure integration. */
2569 /* Install new pointers to the first and last insns in the chain.
2570 Also, set cur_insn_uid to one higher than the last in use.
2571 Used for an inline-procedure after copying the insn chain. */
2574 set_new_first_and_last_insn (rtx_insn
*first
, rtx_insn
*last
)
2578 set_first_insn (first
);
2579 set_last_insn (last
);
2582 if (MIN_NONDEBUG_INSN_UID
|| MAY_HAVE_DEBUG_INSNS
)
2584 int debug_count
= 0;
2586 cur_insn_uid
= MIN_NONDEBUG_INSN_UID
- 1;
2587 cur_debug_insn_uid
= 0;
2589 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
2590 if (INSN_UID (insn
) < MIN_NONDEBUG_INSN_UID
)
2591 cur_debug_insn_uid
= MAX (cur_debug_insn_uid
, INSN_UID (insn
));
2594 cur_insn_uid
= MAX (cur_insn_uid
, INSN_UID (insn
));
2595 if (DEBUG_INSN_P (insn
))
2600 cur_debug_insn_uid
= MIN_NONDEBUG_INSN_UID
+ debug_count
;
2602 cur_debug_insn_uid
++;
2605 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
2606 cur_insn_uid
= MAX (cur_insn_uid
, INSN_UID (insn
));
2611 /* Go through all the RTL insn bodies and copy any invalid shared
2612 structure. This routine should only be called once. */
2615 unshare_all_rtl_1 (rtx_insn
*insn
)
2617 /* Unshare just about everything else. */
2618 unshare_all_rtl_in_chain (insn
);
2620 /* Make sure the addresses of stack slots found outside the insn chain
2621 (such as, in DECL_RTL of a variable) are not shared
2622 with the insn chain.
2624 This special care is necessary when the stack slot MEM does not
2625 actually appear in the insn chain. If it does appear, its address
2626 is unshared from all else at that point. */
2629 FOR_EACH_VEC_SAFE_ELT (stack_slot_list
, i
, temp
)
2630 (*stack_slot_list
)[i
] = copy_rtx_if_shared (temp
);
2633 /* Go through all the RTL insn bodies and copy any invalid shared
2634 structure, again. This is a fairly expensive thing to do so it
2635 should be done sparingly. */
2638 unshare_all_rtl_again (rtx_insn
*insn
)
2643 for (p
= insn
; p
; p
= NEXT_INSN (p
))
2646 reset_used_flags (PATTERN (p
));
2647 reset_used_flags (REG_NOTES (p
));
2649 reset_used_flags (CALL_INSN_FUNCTION_USAGE (p
));
2652 /* Make sure that virtual stack slots are not shared. */
2653 set_used_decls (DECL_INITIAL (cfun
->decl
));
2655 /* Make sure that virtual parameters are not shared. */
2656 for (decl
= DECL_ARGUMENTS (cfun
->decl
); decl
; decl
= DECL_CHAIN (decl
))
2657 set_used_flags (DECL_RTL (decl
));
2661 FOR_EACH_VEC_SAFE_ELT (stack_slot_list
, i
, temp
)
2662 reset_used_flags (temp
);
2664 unshare_all_rtl_1 (insn
);
2668 unshare_all_rtl (void)
2670 unshare_all_rtl_1 (get_insns ());
2672 for (tree decl
= DECL_ARGUMENTS (cfun
->decl
); decl
; decl
= DECL_CHAIN (decl
))
2674 if (DECL_RTL_SET_P (decl
))
2675 SET_DECL_RTL (decl
, copy_rtx_if_shared (DECL_RTL (decl
)));
2676 DECL_INCOMING_RTL (decl
) = copy_rtx_if_shared (DECL_INCOMING_RTL (decl
));
2683 /* Check that ORIG is not marked when it should not be and mark ORIG as in use,
2684 Recursively does the same for subexpressions. */
2687 verify_rtx_sharing (rtx orig
, rtx insn
)
2692 const char *format_ptr
;
2697 code
= GET_CODE (x
);
2699 /* These types may be freely shared. */
2715 /* SCRATCH must be shared because they represent distinct values. */
2718 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
2719 clobbers or clobbers of hard registers that originated as pseudos.
2720 This is needed to allow safe register renaming. */
2721 if (REG_P (XEXP (x
, 0))
2722 && HARD_REGISTER_NUM_P (REGNO (XEXP (x
, 0)))
2723 && HARD_REGISTER_NUM_P (ORIGINAL_REGNO (XEXP (x
, 0))))
2728 if (shared_const_p (orig
))
2733 /* A MEM is allowed to be shared if its address is constant. */
2734 if (CONSTANT_ADDRESS_P (XEXP (x
, 0))
2735 || reload_completed
|| reload_in_progress
)
2744 /* This rtx may not be shared. If it has already been seen,
2745 replace it with a copy of itself. */
2746 if (flag_checking
&& RTX_FLAG (x
, used
))
2748 error ("invalid rtl sharing found in the insn");
2750 error ("shared rtx");
2752 internal_error ("internal consistency failure");
2754 gcc_assert (!RTX_FLAG (x
, used
));
2756 RTX_FLAG (x
, used
) = 1;
2758 /* Now scan the subexpressions recursively. */
2760 format_ptr
= GET_RTX_FORMAT (code
);
2762 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++)
2764 switch (*format_ptr
++)
2767 verify_rtx_sharing (XEXP (x
, i
), insn
);
2771 if (XVEC (x
, i
) != NULL
)
2774 int len
= XVECLEN (x
, i
);
2776 for (j
= 0; j
< len
; j
++)
2778 /* We allow sharing of ASM_OPERANDS inside single
2780 if (j
&& GET_CODE (XVECEXP (x
, i
, j
)) == SET
2781 && (GET_CODE (SET_SRC (XVECEXP (x
, i
, j
)))
2783 verify_rtx_sharing (SET_DEST (XVECEXP (x
, i
, j
)), insn
);
2785 verify_rtx_sharing (XVECEXP (x
, i
, j
), insn
);
2794 /* Reset used-flags for INSN. */
2797 reset_insn_used_flags (rtx insn
)
2799 gcc_assert (INSN_P (insn
));
2800 reset_used_flags (PATTERN (insn
));
2801 reset_used_flags (REG_NOTES (insn
));
2803 reset_used_flags (CALL_INSN_FUNCTION_USAGE (insn
));
2806 /* Go through all the RTL insn bodies and clear all the USED bits. */
2809 reset_all_used_flags (void)
2813 for (p
= get_insns (); p
; p
= NEXT_INSN (p
))
2816 rtx pat
= PATTERN (p
);
2817 if (GET_CODE (pat
) != SEQUENCE
)
2818 reset_insn_used_flags (p
);
2821 gcc_assert (REG_NOTES (p
) == NULL
);
2822 for (int i
= 0; i
< XVECLEN (pat
, 0); i
++)
2824 rtx insn
= XVECEXP (pat
, 0, i
);
2826 reset_insn_used_flags (insn
);
2832 /* Verify sharing in INSN. */
2835 verify_insn_sharing (rtx insn
)
2837 gcc_assert (INSN_P (insn
));
2838 verify_rtx_sharing (PATTERN (insn
), insn
);
2839 verify_rtx_sharing (REG_NOTES (insn
), insn
);
2841 verify_rtx_sharing (CALL_INSN_FUNCTION_USAGE (insn
), insn
);
2844 /* Go through all the RTL insn bodies and check that there is no unexpected
2845 sharing in between the subexpressions. */
2848 verify_rtl_sharing (void)
2852 timevar_push (TV_VERIFY_RTL_SHARING
);
2854 reset_all_used_flags ();
2856 for (p
= get_insns (); p
; p
= NEXT_INSN (p
))
2859 rtx pat
= PATTERN (p
);
2860 if (GET_CODE (pat
) != SEQUENCE
)
2861 verify_insn_sharing (p
);
2863 for (int i
= 0; i
< XVECLEN (pat
, 0); i
++)
2865 rtx insn
= XVECEXP (pat
, 0, i
);
2867 verify_insn_sharing (insn
);
2871 reset_all_used_flags ();
2873 timevar_pop (TV_VERIFY_RTL_SHARING
);
2876 /* Go through all the RTL insn bodies and copy any invalid shared structure.
2877 Assumes the mark bits are cleared at entry. */
2880 unshare_all_rtl_in_chain (rtx_insn
*insn
)
2882 for (; insn
; insn
= NEXT_INSN (insn
))
2885 PATTERN (insn
) = copy_rtx_if_shared (PATTERN (insn
));
2886 REG_NOTES (insn
) = copy_rtx_if_shared (REG_NOTES (insn
));
2888 CALL_INSN_FUNCTION_USAGE (insn
)
2889 = copy_rtx_if_shared (CALL_INSN_FUNCTION_USAGE (insn
));
2893 /* Go through all virtual stack slots of a function and mark them as
2894 shared. We never replace the DECL_RTLs themselves with a copy,
2895 but expressions mentioned into a DECL_RTL cannot be shared with
2896 expressions in the instruction stream.
2898 Note that reload may convert pseudo registers into memories in-place.
2899 Pseudo registers are always shared, but MEMs never are. Thus if we
2900 reset the used flags on MEMs in the instruction stream, we must set
2901 them again on MEMs that appear in DECL_RTLs. */
2904 set_used_decls (tree blk
)
2909 for (t
= BLOCK_VARS (blk
); t
; t
= DECL_CHAIN (t
))
2910 if (DECL_RTL_SET_P (t
))
2911 set_used_flags (DECL_RTL (t
));
2913 /* Now process sub-blocks. */
2914 for (t
= BLOCK_SUBBLOCKS (blk
); t
; t
= BLOCK_CHAIN (t
))
2918 /* Mark ORIG as in use, and return a copy of it if it was already in use.
2919 Recursively does the same for subexpressions. Uses
2920 copy_rtx_if_shared_1 to reduce stack space. */
2923 copy_rtx_if_shared (rtx orig
)
2925 copy_rtx_if_shared_1 (&orig
);
2929 /* Mark *ORIG1 as in use, and set it to a copy of it if it was already in
2930 use. Recursively does the same for subexpressions. */
2933 copy_rtx_if_shared_1 (rtx
*orig1
)
2939 const char *format_ptr
;
2943 /* Repeat is used to turn tail-recursion into iteration. */
2950 code
= GET_CODE (x
);
2952 /* These types may be freely shared. */
2968 /* SCRATCH must be shared because they represent distinct values. */
2971 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
2972 clobbers or clobbers of hard registers that originated as pseudos.
2973 This is needed to allow safe register renaming. */
2974 if (REG_P (XEXP (x
, 0))
2975 && HARD_REGISTER_NUM_P (REGNO (XEXP (x
, 0)))
2976 && HARD_REGISTER_NUM_P (ORIGINAL_REGNO (XEXP (x
, 0))))
2981 if (shared_const_p (x
))
2991 /* The chain of insns is not being copied. */
2998 /* This rtx may not be shared. If it has already been seen,
2999 replace it with a copy of itself. */
3001 if (RTX_FLAG (x
, used
))
3003 x
= shallow_copy_rtx (x
);
3006 RTX_FLAG (x
, used
) = 1;
3008 /* Now scan the subexpressions recursively.
3009 We can store any replaced subexpressions directly into X
3010 since we know X is not shared! Any vectors in X
3011 must be copied if X was copied. */
3013 format_ptr
= GET_RTX_FORMAT (code
);
3014 length
= GET_RTX_LENGTH (code
);
3017 for (i
= 0; i
< length
; i
++)
3019 switch (*format_ptr
++)
3023 copy_rtx_if_shared_1 (last_ptr
);
3024 last_ptr
= &XEXP (x
, i
);
3028 if (XVEC (x
, i
) != NULL
)
3031 int len
= XVECLEN (x
, i
);
3033 /* Copy the vector iff I copied the rtx and the length
3035 if (copied
&& len
> 0)
3036 XVEC (x
, i
) = gen_rtvec_v (len
, XVEC (x
, i
)->elem
);
3038 /* Call recursively on all inside the vector. */
3039 for (j
= 0; j
< len
; j
++)
3042 copy_rtx_if_shared_1 (last_ptr
);
3043 last_ptr
= &XVECEXP (x
, i
, j
);
3058 /* Set the USED bit in X and its non-shareable subparts to FLAG. */
3061 mark_used_flags (rtx x
, int flag
)
3065 const char *format_ptr
;
3068 /* Repeat is used to turn tail-recursion into iteration. */
3073 code
= GET_CODE (x
);
3075 /* These types may be freely shared so we needn't do any resetting
3099 /* The chain of insns is not being copied. */
3106 RTX_FLAG (x
, used
) = flag
;
3108 format_ptr
= GET_RTX_FORMAT (code
);
3109 length
= GET_RTX_LENGTH (code
);
3111 for (i
= 0; i
< length
; i
++)
3113 switch (*format_ptr
++)
3121 mark_used_flags (XEXP (x
, i
), flag
);
3125 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
3126 mark_used_flags (XVECEXP (x
, i
, j
), flag
);
3132 /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used
3133 to look for shared sub-parts. */
3136 reset_used_flags (rtx x
)
3138 mark_used_flags (x
, 0);
3141 /* Set all the USED bits in X to allow copy_rtx_if_shared to be used
3142 to look for shared sub-parts. */
3145 set_used_flags (rtx x
)
3147 mark_used_flags (x
, 1);
3150 /* Copy X if necessary so that it won't be altered by changes in OTHER.
3151 Return X or the rtx for the pseudo reg the value of X was copied into.
3152 OTHER must be valid as a SET_DEST. */
3155 make_safe_from (rtx x
, rtx other
)
3158 switch (GET_CODE (other
))
3161 other
= SUBREG_REG (other
);
3163 case STRICT_LOW_PART
:
3166 other
= XEXP (other
, 0);
3175 && GET_CODE (x
) != SUBREG
)
3177 && (REGNO (other
) < FIRST_PSEUDO_REGISTER
3178 || reg_mentioned_p (other
, x
))))
3180 rtx temp
= gen_reg_rtx (GET_MODE (x
));
3181 emit_move_insn (temp
, x
);
3187 /* Emission of insns (adding them to the doubly-linked list). */
3189 /* Return the last insn emitted, even if it is in a sequence now pushed. */
3192 get_last_insn_anywhere (void)
3194 struct sequence_stack
*seq
;
3195 for (seq
= get_current_sequence (); seq
; seq
= seq
->next
)
3201 /* Return the first nonnote insn emitted in current sequence or current
3202 function. This routine looks inside SEQUENCEs. */
3205 get_first_nonnote_insn (void)
3207 rtx_insn
*insn
= get_insns ();
3212 for (insn
= next_insn (insn
);
3213 insn
&& NOTE_P (insn
);
3214 insn
= next_insn (insn
))
3218 if (NONJUMP_INSN_P (insn
)
3219 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3220 insn
= as_a
<rtx_sequence
*> (PATTERN (insn
))->insn (0);
3227 /* Return the last nonnote insn emitted in current sequence or current
3228 function. This routine looks inside SEQUENCEs. */
3231 get_last_nonnote_insn (void)
3233 rtx_insn
*insn
= get_last_insn ();
3238 for (insn
= previous_insn (insn
);
3239 insn
&& NOTE_P (insn
);
3240 insn
= previous_insn (insn
))
3244 if (NONJUMP_INSN_P (insn
))
3245 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3246 insn
= seq
->insn (seq
->len () - 1);
3253 /* Return the number of actual (non-debug) insns emitted in this
3257 get_max_insn_count (void)
3259 int n
= cur_insn_uid
;
3261 /* The table size must be stable across -g, to avoid codegen
3262 differences due to debug insns, and not be affected by
3263 -fmin-insn-uid, to avoid excessive table size and to simplify
3264 debugging of -fcompare-debug failures. */
3265 if (cur_debug_insn_uid
> MIN_NONDEBUG_INSN_UID
)
3266 n
-= cur_debug_insn_uid
;
3268 n
-= MIN_NONDEBUG_INSN_UID
;
3274 /* Return the next insn. If it is a SEQUENCE, return the first insn
3278 next_insn (rtx_insn
*insn
)
3282 insn
= NEXT_INSN (insn
);
3283 if (insn
&& NONJUMP_INSN_P (insn
)
3284 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3285 insn
= as_a
<rtx_sequence
*> (PATTERN (insn
))->insn (0);
3291 /* Return the previous insn. If it is a SEQUENCE, return the last insn
3295 previous_insn (rtx_insn
*insn
)
3299 insn
= PREV_INSN (insn
);
3300 if (insn
&& NONJUMP_INSN_P (insn
))
3301 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
3302 insn
= seq
->insn (seq
->len () - 1);
3308 /* Return the next insn after INSN that is not a NOTE. This routine does not
3309 look inside SEQUENCEs. */
3312 next_nonnote_insn (rtx_insn
*insn
)
3316 insn
= NEXT_INSN (insn
);
3317 if (insn
== 0 || !NOTE_P (insn
))
3324 /* Return the next insn after INSN that is not a NOTE, but stop the
3325 search before we enter another basic block. This routine does not
3326 look inside SEQUENCEs. */
3329 next_nonnote_insn_bb (rtx_insn
*insn
)
3333 insn
= NEXT_INSN (insn
);
3334 if (insn
== 0 || !NOTE_P (insn
))
3336 if (NOTE_INSN_BASIC_BLOCK_P (insn
))
3343 /* Return the previous insn before INSN that is not a NOTE. This routine does
3344 not look inside SEQUENCEs. */
3347 prev_nonnote_insn (rtx_insn
*insn
)
3351 insn
= PREV_INSN (insn
);
3352 if (insn
== 0 || !NOTE_P (insn
))
3359 /* Return the previous insn before INSN that is not a NOTE, but stop
3360 the search before we enter another basic block. This routine does
3361 not look inside SEQUENCEs. */
3364 prev_nonnote_insn_bb (rtx_insn
*insn
)
3369 insn
= PREV_INSN (insn
);
3370 if (insn
== 0 || !NOTE_P (insn
))
3372 if (NOTE_INSN_BASIC_BLOCK_P (insn
))
3379 /* Return the next insn after INSN that is not a DEBUG_INSN. This
3380 routine does not look inside SEQUENCEs. */
3383 next_nondebug_insn (rtx_insn
*insn
)
3387 insn
= NEXT_INSN (insn
);
3388 if (insn
== 0 || !DEBUG_INSN_P (insn
))
3395 /* Return the previous insn before INSN that is not a DEBUG_INSN.
3396 This routine does not look inside SEQUENCEs. */
3399 prev_nondebug_insn (rtx_insn
*insn
)
3403 insn
= PREV_INSN (insn
);
3404 if (insn
== 0 || !DEBUG_INSN_P (insn
))
3411 /* Return the next insn after INSN that is not a NOTE nor DEBUG_INSN.
3412 This routine does not look inside SEQUENCEs. */
3415 next_nonnote_nondebug_insn (rtx_insn
*insn
)
3419 insn
= NEXT_INSN (insn
);
3420 if (insn
== 0 || (!NOTE_P (insn
) && !DEBUG_INSN_P (insn
)))
3427 /* Return the previous insn before INSN that is not a NOTE nor DEBUG_INSN.
3428 This routine does not look inside SEQUENCEs. */
3431 prev_nonnote_nondebug_insn (rtx_insn
*insn
)
3435 insn
= PREV_INSN (insn
);
3436 if (insn
== 0 || (!NOTE_P (insn
) && !DEBUG_INSN_P (insn
)))
3443 /* Return the next INSN, CALL_INSN or JUMP_INSN after INSN;
3444 or 0, if there is none. This routine does not look inside
3448 next_real_insn (rtx uncast_insn
)
3450 rtx_insn
*insn
= safe_as_a
<rtx_insn
*> (uncast_insn
);
3454 insn
= NEXT_INSN (insn
);
3455 if (insn
== 0 || INSN_P (insn
))
3462 /* Return the last INSN, CALL_INSN or JUMP_INSN before INSN;
3463 or 0, if there is none. This routine does not look inside
3467 prev_real_insn (rtx_insn
*insn
)
3471 insn
= PREV_INSN (insn
);
3472 if (insn
== 0 || INSN_P (insn
))
3479 /* Return the last CALL_INSN in the current list, or 0 if there is none.
3480 This routine does not look inside SEQUENCEs. */
3483 last_call_insn (void)
3487 for (insn
= get_last_insn ();
3488 insn
&& !CALL_P (insn
);
3489 insn
= PREV_INSN (insn
))
3492 return safe_as_a
<rtx_call_insn
*> (insn
);
3495 /* Find the next insn after INSN that really does something. This routine
3496 does not look inside SEQUENCEs. After reload this also skips over
3497 standalone USE and CLOBBER insn. */
3500 active_insn_p (const rtx_insn
*insn
)
3502 return (CALL_P (insn
) || JUMP_P (insn
)
3503 || JUMP_TABLE_DATA_P (insn
) /* FIXME */
3504 || (NONJUMP_INSN_P (insn
)
3505 && (! reload_completed
3506 || (GET_CODE (PATTERN (insn
)) != USE
3507 && GET_CODE (PATTERN (insn
)) != CLOBBER
))));
3511 next_active_insn (rtx_insn
*insn
)
3515 insn
= NEXT_INSN (insn
);
3516 if (insn
== 0 || active_insn_p (insn
))
3523 /* Find the last insn before INSN that really does something. This routine
3524 does not look inside SEQUENCEs. After reload this also skips over
3525 standalone USE and CLOBBER insn. */
3528 prev_active_insn (rtx_insn
*insn
)
3532 insn
= PREV_INSN (insn
);
3533 if (insn
== 0 || active_insn_p (insn
))
3540 /* Return the next insn that uses CC0 after INSN, which is assumed to
3541 set it. This is the inverse of prev_cc0_setter (i.e., prev_cc0_setter
3542 applied to the result of this function should yield INSN).
3544 Normally, this is simply the next insn. However, if a REG_CC_USER note
3545 is present, it contains the insn that uses CC0.
3547 Return 0 if we can't find the insn. */
3550 next_cc0_user (rtx_insn
*insn
)
3552 rtx note
= find_reg_note (insn
, REG_CC_USER
, NULL_RTX
);
3555 return safe_as_a
<rtx_insn
*> (XEXP (note
, 0));
3557 insn
= next_nonnote_insn (insn
);
3558 if (insn
&& NONJUMP_INSN_P (insn
) && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3559 insn
= as_a
<rtx_sequence
*> (PATTERN (insn
))->insn (0);
3561 if (insn
&& INSN_P (insn
) && reg_mentioned_p (cc0_rtx
, PATTERN (insn
)))
3567 /* Find the insn that set CC0 for INSN. Unless INSN has a REG_CC_SETTER
3568 note, it is the previous insn. */
3571 prev_cc0_setter (rtx_insn
*insn
)
3573 rtx note
= find_reg_note (insn
, REG_CC_SETTER
, NULL_RTX
);
3576 return safe_as_a
<rtx_insn
*> (XEXP (note
, 0));
3578 insn
= prev_nonnote_insn (insn
);
3579 gcc_assert (sets_cc0_p (PATTERN (insn
)));
3584 /* Find a RTX_AUTOINC class rtx which matches DATA. */
3587 find_auto_inc (const_rtx x
, const_rtx reg
)
3589 subrtx_iterator::array_type array
;
3590 FOR_EACH_SUBRTX (iter
, array
, x
, NONCONST
)
3592 const_rtx x
= *iter
;
3593 if (GET_RTX_CLASS (GET_CODE (x
)) == RTX_AUTOINC
3594 && rtx_equal_p (reg
, XEXP (x
, 0)))
3600 /* Increment the label uses for all labels present in rtx. */
3603 mark_label_nuses (rtx x
)
3609 code
= GET_CODE (x
);
3610 if (code
== LABEL_REF
&& LABEL_P (label_ref_label (x
)))
3611 LABEL_NUSES (label_ref_label (x
))++;
3613 fmt
= GET_RTX_FORMAT (code
);
3614 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
3617 mark_label_nuses (XEXP (x
, i
));
3618 else if (fmt
[i
] == 'E')
3619 for (j
= XVECLEN (x
, i
) - 1; j
>= 0; j
--)
3620 mark_label_nuses (XVECEXP (x
, i
, j
));
3625 /* Try splitting insns that can be split for better scheduling.
3626 PAT is the pattern which might split.
3627 TRIAL is the insn providing PAT.
3628 LAST is nonzero if we should return the last insn of the sequence produced.
3630 If this routine succeeds in splitting, it returns the first or last
3631 replacement insn depending on the value of LAST. Otherwise, it
3632 returns TRIAL. If the insn to be returned can be split, it will be. */
3635 try_split (rtx pat
, rtx_insn
*trial
, int last
)
3637 rtx_insn
*before
= PREV_INSN (trial
);
3638 rtx_insn
*after
= NEXT_INSN (trial
);
3640 rtx_insn
*seq
, *tem
;
3642 rtx_insn
*insn_last
, *insn
;
3644 rtx_insn
*call_insn
= NULL
;
3646 /* We're not good at redistributing frame information. */
3647 if (RTX_FRAME_RELATED_P (trial
))
3650 if (any_condjump_p (trial
)
3651 && (note
= find_reg_note (trial
, REG_BR_PROB
, 0)))
3652 split_branch_probability
= XINT (note
, 0);
3653 probability
= split_branch_probability
;
3655 seq
= split_insns (pat
, trial
);
3657 split_branch_probability
= -1;
3662 /* Avoid infinite loop if any insn of the result matches
3663 the original pattern. */
3667 if (INSN_P (insn_last
)
3668 && rtx_equal_p (PATTERN (insn_last
), pat
))
3670 if (!NEXT_INSN (insn_last
))
3672 insn_last
= NEXT_INSN (insn_last
);
3675 /* We will be adding the new sequence to the function. The splitters
3676 may have introduced invalid RTL sharing, so unshare the sequence now. */
3677 unshare_all_rtl_in_chain (seq
);
3679 /* Mark labels and copy flags. */
3680 for (insn
= insn_last
; insn
; insn
= PREV_INSN (insn
))
3685 CROSSING_JUMP_P (insn
) = CROSSING_JUMP_P (trial
);
3686 mark_jump_label (PATTERN (insn
), insn
, 0);
3688 if (probability
!= -1
3689 && any_condjump_p (insn
)
3690 && !find_reg_note (insn
, REG_BR_PROB
, 0))
3692 /* We can preserve the REG_BR_PROB notes only if exactly
3693 one jump is created, otherwise the machine description
3694 is responsible for this step using
3695 split_branch_probability variable. */
3696 gcc_assert (njumps
== 1);
3697 add_int_reg_note (insn
, REG_BR_PROB
, probability
);
3702 /* If we are splitting a CALL_INSN, look for the CALL_INSN
3703 in SEQ and copy any additional information across. */
3706 for (insn
= insn_last
; insn
; insn
= PREV_INSN (insn
))
3712 gcc_assert (call_insn
== NULL_RTX
);
3715 /* Add the old CALL_INSN_FUNCTION_USAGE to whatever the
3716 target may have explicitly specified. */
3717 p
= &CALL_INSN_FUNCTION_USAGE (insn
);
3720 *p
= CALL_INSN_FUNCTION_USAGE (trial
);
3722 /* If the old call was a sibling call, the new one must
3724 SIBLING_CALL_P (insn
) = SIBLING_CALL_P (trial
);
3726 /* If the new call is the last instruction in the sequence,
3727 it will effectively replace the old call in-situ. Otherwise
3728 we must move any following NOTE_INSN_CALL_ARG_LOCATION note
3729 so that it comes immediately after the new call. */
3730 if (NEXT_INSN (insn
))
3731 for (next
= NEXT_INSN (trial
);
3732 next
&& NOTE_P (next
);
3733 next
= NEXT_INSN (next
))
3734 if (NOTE_KIND (next
) == NOTE_INSN_CALL_ARG_LOCATION
)
3737 add_insn_after (next
, insn
, NULL
);
3743 /* Copy notes, particularly those related to the CFG. */
3744 for (note
= REG_NOTES (trial
); note
; note
= XEXP (note
, 1))
3746 switch (REG_NOTE_KIND (note
))
3749 copy_reg_eh_region_note_backward (note
, insn_last
, NULL
);
3755 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3758 add_reg_note (insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3762 case REG_NON_LOCAL_GOTO
:
3763 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3766 add_reg_note (insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3774 for (insn
= insn_last
; insn
!= NULL_RTX
; insn
= PREV_INSN (insn
))
3776 rtx reg
= XEXP (note
, 0);
3777 if (!FIND_REG_INC_NOTE (insn
, reg
)
3778 && find_auto_inc (PATTERN (insn
), reg
))
3779 add_reg_note (insn
, REG_INC
, reg
);
3784 fixup_args_size_notes (NULL
, insn_last
, INTVAL (XEXP (note
, 0)));
3788 gcc_assert (call_insn
!= NULL_RTX
);
3789 add_reg_note (call_insn
, REG_NOTE_KIND (note
), XEXP (note
, 0));
3797 /* If there are LABELS inside the split insns increment the
3798 usage count so we don't delete the label. */
3802 while (insn
!= NULL_RTX
)
3804 /* JUMP_P insns have already been "marked" above. */
3805 if (NONJUMP_INSN_P (insn
))
3806 mark_label_nuses (PATTERN (insn
));
3808 insn
= PREV_INSN (insn
);
3812 tem
= emit_insn_after_setloc (seq
, trial
, INSN_LOCATION (trial
));
3814 delete_insn (trial
);
3816 /* Recursively call try_split for each new insn created; by the
3817 time control returns here that insn will be fully split, so
3818 set LAST and continue from the insn after the one returned.
3819 We can't use next_active_insn here since AFTER may be a note.
3820 Ignore deleted insns, which can be occur if not optimizing. */
3821 for (tem
= NEXT_INSN (before
); tem
!= after
; tem
= NEXT_INSN (tem
))
3822 if (! tem
->deleted () && INSN_P (tem
))
3823 tem
= try_split (PATTERN (tem
), tem
, 1);
3825 /* Return either the first or the last insn, depending on which was
3828 ? (after
? PREV_INSN (after
) : get_last_insn ())
3829 : NEXT_INSN (before
);
3832 /* Make and return an INSN rtx, initializing all its slots.
3833 Store PATTERN in the pattern slots. */
3836 make_insn_raw (rtx pattern
)
3840 insn
= as_a
<rtx_insn
*> (rtx_alloc (INSN
));
3842 INSN_UID (insn
) = cur_insn_uid
++;
3843 PATTERN (insn
) = pattern
;
3844 INSN_CODE (insn
) = -1;
3845 REG_NOTES (insn
) = NULL
;
3846 INSN_LOCATION (insn
) = curr_insn_location ();
3847 BLOCK_FOR_INSN (insn
) = NULL
;
3849 #ifdef ENABLE_RTL_CHECKING
3852 && (returnjump_p (insn
)
3853 || (GET_CODE (insn
) == SET
3854 && SET_DEST (insn
) == pc_rtx
)))
3856 warning (0, "ICE: emit_insn used where emit_jump_insn needed:\n");
3864 /* Like `make_insn_raw' but make a DEBUG_INSN instead of an insn. */
3867 make_debug_insn_raw (rtx pattern
)
3869 rtx_debug_insn
*insn
;
3871 insn
= as_a
<rtx_debug_insn
*> (rtx_alloc (DEBUG_INSN
));
3872 INSN_UID (insn
) = cur_debug_insn_uid
++;
3873 if (cur_debug_insn_uid
> MIN_NONDEBUG_INSN_UID
)
3874 INSN_UID (insn
) = cur_insn_uid
++;
3876 PATTERN (insn
) = pattern
;
3877 INSN_CODE (insn
) = -1;
3878 REG_NOTES (insn
) = NULL
;
3879 INSN_LOCATION (insn
) = curr_insn_location ();
3880 BLOCK_FOR_INSN (insn
) = NULL
;
3885 /* Like `make_insn_raw' but make a JUMP_INSN instead of an insn. */
3888 make_jump_insn_raw (rtx pattern
)
3890 rtx_jump_insn
*insn
;
3892 insn
= as_a
<rtx_jump_insn
*> (rtx_alloc (JUMP_INSN
));
3893 INSN_UID (insn
) = cur_insn_uid
++;
3895 PATTERN (insn
) = pattern
;
3896 INSN_CODE (insn
) = -1;
3897 REG_NOTES (insn
) = NULL
;
3898 JUMP_LABEL (insn
) = NULL
;
3899 INSN_LOCATION (insn
) = curr_insn_location ();
3900 BLOCK_FOR_INSN (insn
) = NULL
;
3905 /* Like `make_insn_raw' but make a CALL_INSN instead of an insn. */
3908 make_call_insn_raw (rtx pattern
)
3910 rtx_call_insn
*insn
;
3912 insn
= as_a
<rtx_call_insn
*> (rtx_alloc (CALL_INSN
));
3913 INSN_UID (insn
) = cur_insn_uid
++;
3915 PATTERN (insn
) = pattern
;
3916 INSN_CODE (insn
) = -1;
3917 REG_NOTES (insn
) = NULL
;
3918 CALL_INSN_FUNCTION_USAGE (insn
) = NULL
;
3919 INSN_LOCATION (insn
) = curr_insn_location ();
3920 BLOCK_FOR_INSN (insn
) = NULL
;
3925 /* Like `make_insn_raw' but make a NOTE instead of an insn. */
3928 make_note_raw (enum insn_note subtype
)
3930 /* Some notes are never created this way at all. These notes are
3931 only created by patching out insns. */
3932 gcc_assert (subtype
!= NOTE_INSN_DELETED_LABEL
3933 && subtype
!= NOTE_INSN_DELETED_DEBUG_LABEL
);
3935 rtx_note
*note
= as_a
<rtx_note
*> (rtx_alloc (NOTE
));
3936 INSN_UID (note
) = cur_insn_uid
++;
3937 NOTE_KIND (note
) = subtype
;
3938 BLOCK_FOR_INSN (note
) = NULL
;
3939 memset (&NOTE_DATA (note
), 0, sizeof (NOTE_DATA (note
)));
3943 /* Add INSN to the end of the doubly-linked list, between PREV and NEXT.
3944 INSN may be any object that can appear in the chain: INSN_P and NOTE_P objects,
3945 but also BARRIERs and JUMP_TABLE_DATAs. PREV and NEXT may be NULL. */
3948 link_insn_into_chain (rtx_insn
*insn
, rtx_insn
*prev
, rtx_insn
*next
)
3950 SET_PREV_INSN (insn
) = prev
;
3951 SET_NEXT_INSN (insn
) = next
;
3954 SET_NEXT_INSN (prev
) = insn
;
3955 if (NONJUMP_INSN_P (prev
) && GET_CODE (PATTERN (prev
)) == SEQUENCE
)
3957 rtx_sequence
*sequence
= as_a
<rtx_sequence
*> (PATTERN (prev
));
3958 SET_NEXT_INSN (sequence
->insn (sequence
->len () - 1)) = insn
;
3963 SET_PREV_INSN (next
) = insn
;
3964 if (NONJUMP_INSN_P (next
) && GET_CODE (PATTERN (next
)) == SEQUENCE
)
3966 rtx_sequence
*sequence
= as_a
<rtx_sequence
*> (PATTERN (next
));
3967 SET_PREV_INSN (sequence
->insn (0)) = insn
;
3971 if (NONJUMP_INSN_P (insn
) && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3973 rtx_sequence
*sequence
= as_a
<rtx_sequence
*> (PATTERN (insn
));
3974 SET_PREV_INSN (sequence
->insn (0)) = prev
;
3975 SET_NEXT_INSN (sequence
->insn (sequence
->len () - 1)) = next
;
3979 /* Add INSN to the end of the doubly-linked list.
3980 INSN may be an INSN, JUMP_INSN, CALL_INSN, CODE_LABEL, BARRIER or NOTE. */
3983 add_insn (rtx_insn
*insn
)
3985 rtx_insn
*prev
= get_last_insn ();
3986 link_insn_into_chain (insn
, prev
, NULL
);
3987 if (NULL
== get_insns ())
3988 set_first_insn (insn
);
3989 set_last_insn (insn
);
3992 /* Add INSN into the doubly-linked list after insn AFTER. */
3995 add_insn_after_nobb (rtx_insn
*insn
, rtx_insn
*after
)
3997 rtx_insn
*next
= NEXT_INSN (after
);
3999 gcc_assert (!optimize
|| !after
->deleted ());
4001 link_insn_into_chain (insn
, after
, next
);
4005 struct sequence_stack
*seq
;
4007 for (seq
= get_current_sequence (); seq
; seq
= seq
->next
)
4008 if (after
== seq
->last
)
4016 /* Add INSN into the doubly-linked list before insn BEFORE. */
4019 add_insn_before_nobb (rtx_insn
*insn
, rtx_insn
*before
)
4021 rtx_insn
*prev
= PREV_INSN (before
);
4023 gcc_assert (!optimize
|| !before
->deleted ());
4025 link_insn_into_chain (insn
, prev
, before
);
4029 struct sequence_stack
*seq
;
4031 for (seq
= get_current_sequence (); seq
; seq
= seq
->next
)
4032 if (before
== seq
->first
)
4042 /* Like add_insn_after_nobb, but try to set BLOCK_FOR_INSN.
4043 If BB is NULL, an attempt is made to infer the bb from before.
4045 This and the next function should be the only functions called
4046 to insert an insn once delay slots have been filled since only
4047 they know how to update a SEQUENCE. */
4050 add_insn_after (rtx uncast_insn
, rtx uncast_after
, basic_block bb
)
4052 rtx_insn
*insn
= as_a
<rtx_insn
*> (uncast_insn
);
4053 rtx_insn
*after
= as_a
<rtx_insn
*> (uncast_after
);
4054 add_insn_after_nobb (insn
, after
);
4055 if (!BARRIER_P (after
)
4056 && !BARRIER_P (insn
)
4057 && (bb
= BLOCK_FOR_INSN (after
)))
4059 set_block_for_insn (insn
, bb
);
4061 df_insn_rescan (insn
);
4062 /* Should not happen as first in the BB is always
4063 either NOTE or LABEL. */
4064 if (BB_END (bb
) == after
4065 /* Avoid clobbering of structure when creating new BB. */
4066 && !BARRIER_P (insn
)
4067 && !NOTE_INSN_BASIC_BLOCK_P (insn
))
4072 /* Like add_insn_before_nobb, but try to set BLOCK_FOR_INSN.
4073 If BB is NULL, an attempt is made to infer the bb from before.
4075 This and the previous function should be the only functions called
4076 to insert an insn once delay slots have been filled since only
4077 they know how to update a SEQUENCE. */
4080 add_insn_before (rtx uncast_insn
, rtx uncast_before
, basic_block bb
)
4082 rtx_insn
*insn
= as_a
<rtx_insn
*> (uncast_insn
);
4083 rtx_insn
*before
= as_a
<rtx_insn
*> (uncast_before
);
4084 add_insn_before_nobb (insn
, before
);
4087 && !BARRIER_P (before
)
4088 && !BARRIER_P (insn
))
4089 bb
= BLOCK_FOR_INSN (before
);
4093 set_block_for_insn (insn
, bb
);
4095 df_insn_rescan (insn
);
4096 /* Should not happen as first in the BB is always either NOTE or
4098 gcc_assert (BB_HEAD (bb
) != insn
4099 /* Avoid clobbering of structure when creating new BB. */
4101 || NOTE_INSN_BASIC_BLOCK_P (insn
));
4105 /* Replace insn with an deleted instruction note. */
4108 set_insn_deleted (rtx insn
)
4111 df_insn_delete (as_a
<rtx_insn
*> (insn
));
4112 PUT_CODE (insn
, NOTE
);
4113 NOTE_KIND (insn
) = NOTE_INSN_DELETED
;
4117 /* Unlink INSN from the insn chain.
4119 This function knows how to handle sequences.
4121 This function does not invalidate data flow information associated with
4122 INSN (i.e. does not call df_insn_delete). That makes this function
4123 usable for only disconnecting an insn from the chain, and re-emit it
4126 To later insert INSN elsewhere in the insn chain via add_insn and
4127 similar functions, PREV_INSN and NEXT_INSN must be nullified by
4128 the caller. Nullifying them here breaks many insn chain walks.
4130 To really delete an insn and related DF information, use delete_insn. */
4133 remove_insn (rtx uncast_insn
)
4135 rtx_insn
*insn
= as_a
<rtx_insn
*> (uncast_insn
);
4136 rtx_insn
*next
= NEXT_INSN (insn
);
4137 rtx_insn
*prev
= PREV_INSN (insn
);
4142 SET_NEXT_INSN (prev
) = next
;
4143 if (NONJUMP_INSN_P (prev
) && GET_CODE (PATTERN (prev
)) == SEQUENCE
)
4145 rtx_sequence
*sequence
= as_a
<rtx_sequence
*> (PATTERN (prev
));
4146 SET_NEXT_INSN (sequence
->insn (sequence
->len () - 1)) = next
;
4151 struct sequence_stack
*seq
;
4153 for (seq
= get_current_sequence (); seq
; seq
= seq
->next
)
4154 if (insn
== seq
->first
)
4165 SET_PREV_INSN (next
) = prev
;
4166 if (NONJUMP_INSN_P (next
) && GET_CODE (PATTERN (next
)) == SEQUENCE
)
4168 rtx_sequence
*sequence
= as_a
<rtx_sequence
*> (PATTERN (next
));
4169 SET_PREV_INSN (sequence
->insn (0)) = prev
;
4174 struct sequence_stack
*seq
;
4176 for (seq
= get_current_sequence (); seq
; seq
= seq
->next
)
4177 if (insn
== seq
->last
)
4186 /* Fix up basic block boundaries, if necessary. */
4187 if (!BARRIER_P (insn
)
4188 && (bb
= BLOCK_FOR_INSN (insn
)))
4190 if (BB_HEAD (bb
) == insn
)
4192 /* Never ever delete the basic block note without deleting whole
4194 gcc_assert (!NOTE_P (insn
));
4195 BB_HEAD (bb
) = next
;
4197 if (BB_END (bb
) == insn
)
4202 /* Append CALL_FUSAGE to the CALL_INSN_FUNCTION_USAGE for CALL_INSN. */
4205 add_function_usage_to (rtx call_insn
, rtx call_fusage
)
4207 gcc_assert (call_insn
&& CALL_P (call_insn
));
4209 /* Put the register usage information on the CALL. If there is already
4210 some usage information, put ours at the end. */
4211 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
4215 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
4216 link
= XEXP (link
, 1))
4219 XEXP (link
, 1) = call_fusage
;
4222 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
4225 /* Delete all insns made since FROM.
4226 FROM becomes the new last instruction. */
4229 delete_insns_since (rtx_insn
*from
)
4234 SET_NEXT_INSN (from
) = 0;
4235 set_last_insn (from
);
4238 /* This function is deprecated, please use sequences instead.
4240 Move a consecutive bunch of insns to a different place in the chain.
4241 The insns to be moved are those between FROM and TO.
4242 They are moved to a new position after the insn AFTER.
4243 AFTER must not be FROM or TO or any insn in between.
4245 This function does not know about SEQUENCEs and hence should not be
4246 called after delay-slot filling has been done. */
4249 reorder_insns_nobb (rtx_insn
*from
, rtx_insn
*to
, rtx_insn
*after
)
4253 for (rtx_insn
*x
= from
; x
!= to
; x
= NEXT_INSN (x
))
4254 gcc_assert (after
!= x
);
4255 gcc_assert (after
!= to
);
4258 /* Splice this bunch out of where it is now. */
4259 if (PREV_INSN (from
))
4260 SET_NEXT_INSN (PREV_INSN (from
)) = NEXT_INSN (to
);
4262 SET_PREV_INSN (NEXT_INSN (to
)) = PREV_INSN (from
);
4263 if (get_last_insn () == to
)
4264 set_last_insn (PREV_INSN (from
));
4265 if (get_insns () == from
)
4266 set_first_insn (NEXT_INSN (to
));
4268 /* Make the new neighbors point to it and it to them. */
4269 if (NEXT_INSN (after
))
4270 SET_PREV_INSN (NEXT_INSN (after
)) = to
;
4272 SET_NEXT_INSN (to
) = NEXT_INSN (after
);
4273 SET_PREV_INSN (from
) = after
;
4274 SET_NEXT_INSN (after
) = from
;
4275 if (after
== get_last_insn ())
4279 /* Same as function above, but take care to update BB boundaries. */
4281 reorder_insns (rtx_insn
*from
, rtx_insn
*to
, rtx_insn
*after
)
4283 rtx_insn
*prev
= PREV_INSN (from
);
4284 basic_block bb
, bb2
;
4286 reorder_insns_nobb (from
, to
, after
);
4288 if (!BARRIER_P (after
)
4289 && (bb
= BLOCK_FOR_INSN (after
)))
4292 df_set_bb_dirty (bb
);
4294 if (!BARRIER_P (from
)
4295 && (bb2
= BLOCK_FOR_INSN (from
)))
4297 if (BB_END (bb2
) == to
)
4298 BB_END (bb2
) = prev
;
4299 df_set_bb_dirty (bb2
);
4302 if (BB_END (bb
) == after
)
4305 for (x
= from
; x
!= NEXT_INSN (to
); x
= NEXT_INSN (x
))
4307 df_insn_change_bb (x
, bb
);
4312 /* Emit insn(s) of given code and pattern
4313 at a specified place within the doubly-linked list.
4315 All of the emit_foo global entry points accept an object
4316 X which is either an insn list or a PATTERN of a single
4319 There are thus a few canonical ways to generate code and
4320 emit it at a specific place in the instruction stream. For
4321 example, consider the instruction named SPOT and the fact that
4322 we would like to emit some instructions before SPOT. We might
4326 ... emit the new instructions ...
4327 insns_head = get_insns ();
4330 emit_insn_before (insns_head, SPOT);
4332 It used to be common to generate SEQUENCE rtl instead, but that
4333 is a relic of the past which no longer occurs. The reason is that
4334 SEQUENCE rtl results in much fragmented RTL memory since the SEQUENCE
4335 generated would almost certainly die right after it was created. */
4338 emit_pattern_before_noloc (rtx x
, rtx before
, rtx last
, basic_block bb
,
4339 rtx_insn
*(*make_raw
) (rtx
))
4343 gcc_assert (before
);
4346 return safe_as_a
<rtx_insn
*> (last
);
4348 switch (GET_CODE (x
))
4357 insn
= as_a
<rtx_insn
*> (x
);
4360 rtx_insn
*next
= NEXT_INSN (insn
);
4361 add_insn_before (insn
, before
, bb
);
4367 #ifdef ENABLE_RTL_CHECKING
4374 last
= (*make_raw
) (x
);
4375 add_insn_before (last
, before
, bb
);
4379 return safe_as_a
<rtx_insn
*> (last
);
4382 /* Make X be output before the instruction BEFORE. */
4385 emit_insn_before_noloc (rtx x
, rtx_insn
*before
, basic_block bb
)
4387 return emit_pattern_before_noloc (x
, before
, before
, bb
, make_insn_raw
);
4390 /* Make an instruction with body X and code JUMP_INSN
4391 and output it before the instruction BEFORE. */
4394 emit_jump_insn_before_noloc (rtx x
, rtx_insn
*before
)
4396 return as_a
<rtx_jump_insn
*> (
4397 emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4398 make_jump_insn_raw
));
4401 /* Make an instruction with body X and code CALL_INSN
4402 and output it before the instruction BEFORE. */
4405 emit_call_insn_before_noloc (rtx x
, rtx_insn
*before
)
4407 return emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4408 make_call_insn_raw
);
4411 /* Make an instruction with body X and code DEBUG_INSN
4412 and output it before the instruction BEFORE. */
4415 emit_debug_insn_before_noloc (rtx x
, rtx before
)
4417 return emit_pattern_before_noloc (x
, before
, NULL_RTX
, NULL
,
4418 make_debug_insn_raw
);
4421 /* Make an insn of code BARRIER
4422 and output it before the insn BEFORE. */
4425 emit_barrier_before (rtx before
)
4427 rtx_barrier
*insn
= as_a
<rtx_barrier
*> (rtx_alloc (BARRIER
));
4429 INSN_UID (insn
) = cur_insn_uid
++;
4431 add_insn_before (insn
, before
, NULL
);
4435 /* Emit the label LABEL before the insn BEFORE. */
4438 emit_label_before (rtx label
, rtx_insn
*before
)
4440 gcc_checking_assert (INSN_UID (label
) == 0);
4441 INSN_UID (label
) = cur_insn_uid
++;
4442 add_insn_before (label
, before
, NULL
);
4443 return as_a
<rtx_code_label
*> (label
);
4446 /* Helper for emit_insn_after, handles lists of instructions
4450 emit_insn_after_1 (rtx_insn
*first
, rtx uncast_after
, basic_block bb
)
4452 rtx_insn
*after
= safe_as_a
<rtx_insn
*> (uncast_after
);
4454 rtx_insn
*after_after
;
4455 if (!bb
&& !BARRIER_P (after
))
4456 bb
= BLOCK_FOR_INSN (after
);
4460 df_set_bb_dirty (bb
);
4461 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4462 if (!BARRIER_P (last
))
4464 set_block_for_insn (last
, bb
);
4465 df_insn_rescan (last
);
4467 if (!BARRIER_P (last
))
4469 set_block_for_insn (last
, bb
);
4470 df_insn_rescan (last
);
4472 if (BB_END (bb
) == after
)
4476 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4479 after_after
= NEXT_INSN (after
);
4481 SET_NEXT_INSN (after
) = first
;
4482 SET_PREV_INSN (first
) = after
;
4483 SET_NEXT_INSN (last
) = after_after
;
4485 SET_PREV_INSN (after_after
) = last
;
4487 if (after
== get_last_insn ())
4488 set_last_insn (last
);
4494 emit_pattern_after_noloc (rtx x
, rtx uncast_after
, basic_block bb
,
4495 rtx_insn
*(*make_raw
)(rtx
))
4497 rtx_insn
*after
= safe_as_a
<rtx_insn
*> (uncast_after
);
4498 rtx_insn
*last
= after
;
4505 switch (GET_CODE (x
))
4514 last
= emit_insn_after_1 (as_a
<rtx_insn
*> (x
), after
, bb
);
4517 #ifdef ENABLE_RTL_CHECKING
4524 last
= (*make_raw
) (x
);
4525 add_insn_after (last
, after
, bb
);
4532 /* Make X be output after the insn AFTER and set the BB of insn. If
4533 BB is NULL, an attempt is made to infer the BB from AFTER. */
4536 emit_insn_after_noloc (rtx x
, rtx after
, basic_block bb
)
4538 return emit_pattern_after_noloc (x
, after
, bb
, make_insn_raw
);
4542 /* Make an insn of code JUMP_INSN with body X
4543 and output it after the insn AFTER. */
4546 emit_jump_insn_after_noloc (rtx x
, rtx after
)
4548 return as_a
<rtx_jump_insn
*> (
4549 emit_pattern_after_noloc (x
, after
, NULL
, make_jump_insn_raw
));
4552 /* Make an instruction with body X and code CALL_INSN
4553 and output it after the instruction AFTER. */
4556 emit_call_insn_after_noloc (rtx x
, rtx after
)
4558 return emit_pattern_after_noloc (x
, after
, NULL
, make_call_insn_raw
);
4561 /* Make an instruction with body X and code CALL_INSN
4562 and output it after the instruction AFTER. */
4565 emit_debug_insn_after_noloc (rtx x
, rtx after
)
4567 return emit_pattern_after_noloc (x
, after
, NULL
, make_debug_insn_raw
);
4570 /* Make an insn of code BARRIER
4571 and output it after the insn AFTER. */
4574 emit_barrier_after (rtx after
)
4576 rtx_barrier
*insn
= as_a
<rtx_barrier
*> (rtx_alloc (BARRIER
));
4578 INSN_UID (insn
) = cur_insn_uid
++;
4580 add_insn_after (insn
, after
, NULL
);
4584 /* Emit the label LABEL after the insn AFTER. */
4587 emit_label_after (rtx label
, rtx_insn
*after
)
4589 gcc_checking_assert (INSN_UID (label
) == 0);
4590 INSN_UID (label
) = cur_insn_uid
++;
4591 add_insn_after (label
, after
, NULL
);
4592 return as_a
<rtx_insn
*> (label
);
4595 /* Notes require a bit of special handling: Some notes need to have their
4596 BLOCK_FOR_INSN set, others should never have it set, and some should
4597 have it set or clear depending on the context. */
4599 /* Return true iff a note of kind SUBTYPE should be emitted with routines
4600 that never set BLOCK_FOR_INSN on NOTE. BB_BOUNDARY is true if the
4601 caller is asked to emit a note before BB_HEAD, or after BB_END. */
4604 note_outside_basic_block_p (enum insn_note subtype
, bool on_bb_boundary_p
)
4608 /* NOTE_INSN_SWITCH_TEXT_SECTIONS only appears between basic blocks. */
4609 case NOTE_INSN_SWITCH_TEXT_SECTIONS
:
4612 /* Notes for var tracking and EH region markers can appear between or
4613 inside basic blocks. If the caller is emitting on the basic block
4614 boundary, do not set BLOCK_FOR_INSN on the new note. */
4615 case NOTE_INSN_VAR_LOCATION
:
4616 case NOTE_INSN_CALL_ARG_LOCATION
:
4617 case NOTE_INSN_EH_REGION_BEG
:
4618 case NOTE_INSN_EH_REGION_END
:
4619 return on_bb_boundary_p
;
4621 /* Otherwise, BLOCK_FOR_INSN must be set. */
4627 /* Emit a note of subtype SUBTYPE after the insn AFTER. */
4630 emit_note_after (enum insn_note subtype
, rtx_insn
*after
)
4632 rtx_note
*note
= make_note_raw (subtype
);
4633 basic_block bb
= BARRIER_P (after
) ? NULL
: BLOCK_FOR_INSN (after
);
4634 bool on_bb_boundary_p
= (bb
!= NULL
&& BB_END (bb
) == after
);
4636 if (note_outside_basic_block_p (subtype
, on_bb_boundary_p
))
4637 add_insn_after_nobb (note
, after
);
4639 add_insn_after (note
, after
, bb
);
4643 /* Emit a note of subtype SUBTYPE before the insn BEFORE. */
4646 emit_note_before (enum insn_note subtype
, rtx_insn
*before
)
4648 rtx_note
*note
= make_note_raw (subtype
);
4649 basic_block bb
= BARRIER_P (before
) ? NULL
: BLOCK_FOR_INSN (before
);
4650 bool on_bb_boundary_p
= (bb
!= NULL
&& BB_HEAD (bb
) == before
);
4652 if (note_outside_basic_block_p (subtype
, on_bb_boundary_p
))
4653 add_insn_before_nobb (note
, before
);
4655 add_insn_before (note
, before
, bb
);
4659 /* Insert PATTERN after AFTER, setting its INSN_LOCATION to LOC.
4660 MAKE_RAW indicates how to turn PATTERN into a real insn. */
4663 emit_pattern_after_setloc (rtx pattern
, rtx uncast_after
, int loc
,
4664 rtx_insn
*(*make_raw
) (rtx
))
4666 rtx_insn
*after
= safe_as_a
<rtx_insn
*> (uncast_after
);
4667 rtx_insn
*last
= emit_pattern_after_noloc (pattern
, after
, NULL
, make_raw
);
4669 if (pattern
== NULL_RTX
|| !loc
)
4672 after
= NEXT_INSN (after
);
4675 if (active_insn_p (after
)
4676 && !JUMP_TABLE_DATA_P (after
) /* FIXME */
4677 && !INSN_LOCATION (after
))
4678 INSN_LOCATION (after
) = loc
;
4681 after
= NEXT_INSN (after
);
4686 /* Insert PATTERN after AFTER. MAKE_RAW indicates how to turn PATTERN
4687 into a real insn. SKIP_DEBUG_INSNS indicates whether to insert after
4691 emit_pattern_after (rtx pattern
, rtx uncast_after
, bool skip_debug_insns
,
4692 rtx_insn
*(*make_raw
) (rtx
))
4694 rtx_insn
*after
= safe_as_a
<rtx_insn
*> (uncast_after
);
4695 rtx_insn
*prev
= after
;
4697 if (skip_debug_insns
)
4698 while (DEBUG_INSN_P (prev
))
4699 prev
= PREV_INSN (prev
);
4702 return emit_pattern_after_setloc (pattern
, after
, INSN_LOCATION (prev
),
4705 return emit_pattern_after_noloc (pattern
, after
, NULL
, make_raw
);
4708 /* Like emit_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4710 emit_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4712 return emit_pattern_after_setloc (pattern
, after
, loc
, make_insn_raw
);
4715 /* Like emit_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4717 emit_insn_after (rtx pattern
, rtx after
)
4719 return emit_pattern_after (pattern
, after
, true, make_insn_raw
);
4722 /* Like emit_jump_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4724 emit_jump_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4726 return as_a
<rtx_jump_insn
*> (
4727 emit_pattern_after_setloc (pattern
, after
, loc
, make_jump_insn_raw
));
4730 /* Like emit_jump_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4732 emit_jump_insn_after (rtx pattern
, rtx after
)
4734 return as_a
<rtx_jump_insn
*> (
4735 emit_pattern_after (pattern
, after
, true, make_jump_insn_raw
));
4738 /* Like emit_call_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4740 emit_call_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4742 return emit_pattern_after_setloc (pattern
, after
, loc
, make_call_insn_raw
);
4745 /* Like emit_call_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4747 emit_call_insn_after (rtx pattern
, rtx after
)
4749 return emit_pattern_after (pattern
, after
, true, make_call_insn_raw
);
4752 /* Like emit_debug_insn_after_noloc, but set INSN_LOCATION according to LOC. */
4754 emit_debug_insn_after_setloc (rtx pattern
, rtx after
, int loc
)
4756 return emit_pattern_after_setloc (pattern
, after
, loc
, make_debug_insn_raw
);
4759 /* Like emit_debug_insn_after_noloc, but set INSN_LOCATION according to AFTER. */
4761 emit_debug_insn_after (rtx pattern
, rtx after
)
4763 return emit_pattern_after (pattern
, after
, false, make_debug_insn_raw
);
4766 /* Insert PATTERN before BEFORE, setting its INSN_LOCATION to LOC.
4767 MAKE_RAW indicates how to turn PATTERN into a real insn. INSNP
4768 indicates if PATTERN is meant for an INSN as opposed to a JUMP_INSN,
4772 emit_pattern_before_setloc (rtx pattern
, rtx uncast_before
, int loc
, bool insnp
,
4773 rtx_insn
*(*make_raw
) (rtx
))
4775 rtx_insn
*before
= as_a
<rtx_insn
*> (uncast_before
);
4776 rtx_insn
*first
= PREV_INSN (before
);
4777 rtx_insn
*last
= emit_pattern_before_noloc (pattern
, before
,
4778 insnp
? before
: NULL_RTX
,
4781 if (pattern
== NULL_RTX
|| !loc
)
4785 first
= get_insns ();
4787 first
= NEXT_INSN (first
);
4790 if (active_insn_p (first
)
4791 && !JUMP_TABLE_DATA_P (first
) /* FIXME */
4792 && !INSN_LOCATION (first
))
4793 INSN_LOCATION (first
) = loc
;
4796 first
= NEXT_INSN (first
);
4801 /* Insert PATTERN before BEFORE. MAKE_RAW indicates how to turn PATTERN
4802 into a real insn. SKIP_DEBUG_INSNS indicates whether to insert
4803 before any DEBUG_INSNs. INSNP indicates if PATTERN is meant for an
4804 INSN as opposed to a JUMP_INSN, CALL_INSN, etc. */
4807 emit_pattern_before (rtx pattern
, rtx uncast_before
, bool skip_debug_insns
,
4808 bool insnp
, rtx_insn
*(*make_raw
) (rtx
))
4810 rtx_insn
*before
= safe_as_a
<rtx_insn
*> (uncast_before
);
4811 rtx_insn
*next
= before
;
4813 if (skip_debug_insns
)
4814 while (DEBUG_INSN_P (next
))
4815 next
= PREV_INSN (next
);
4818 return emit_pattern_before_setloc (pattern
, before
, INSN_LOCATION (next
),
4821 return emit_pattern_before_noloc (pattern
, before
,
4822 insnp
? before
: NULL_RTX
,
4826 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4828 emit_insn_before_setloc (rtx pattern
, rtx_insn
*before
, int loc
)
4830 return emit_pattern_before_setloc (pattern
, before
, loc
, true,
4834 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to BEFORE. */
4836 emit_insn_before (rtx pattern
, rtx before
)
4838 return emit_pattern_before (pattern
, before
, true, true, make_insn_raw
);
4841 /* like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4843 emit_jump_insn_before_setloc (rtx pattern
, rtx_insn
*before
, int loc
)
4845 return as_a
<rtx_jump_insn
*> (
4846 emit_pattern_before_setloc (pattern
, before
, loc
, false,
4847 make_jump_insn_raw
));
4850 /* Like emit_jump_insn_before_noloc, but set INSN_LOCATION according to BEFORE. */
4852 emit_jump_insn_before (rtx pattern
, rtx before
)
4854 return as_a
<rtx_jump_insn
*> (
4855 emit_pattern_before (pattern
, before
, true, false,
4856 make_jump_insn_raw
));
4859 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4861 emit_call_insn_before_setloc (rtx pattern
, rtx_insn
*before
, int loc
)
4863 return emit_pattern_before_setloc (pattern
, before
, loc
, false,
4864 make_call_insn_raw
);
4867 /* Like emit_call_insn_before_noloc,
4868 but set insn_location according to BEFORE. */
4870 emit_call_insn_before (rtx pattern
, rtx_insn
*before
)
4872 return emit_pattern_before (pattern
, before
, true, false,
4873 make_call_insn_raw
);
4876 /* Like emit_insn_before_noloc, but set INSN_LOCATION according to LOC. */
4878 emit_debug_insn_before_setloc (rtx pattern
, rtx before
, int loc
)
4880 return emit_pattern_before_setloc (pattern
, before
, loc
, false,
4881 make_debug_insn_raw
);
4884 /* Like emit_debug_insn_before_noloc,
4885 but set insn_location according to BEFORE. */
4887 emit_debug_insn_before (rtx pattern
, rtx_insn
*before
)
4889 return emit_pattern_before (pattern
, before
, false, false,
4890 make_debug_insn_raw
);
4893 /* Take X and emit it at the end of the doubly-linked
4896 Returns the last insn emitted. */
4901 rtx_insn
*last
= get_last_insn ();
4907 switch (GET_CODE (x
))
4916 insn
= as_a
<rtx_insn
*> (x
);
4919 rtx_insn
*next
= NEXT_INSN (insn
);
4926 #ifdef ENABLE_RTL_CHECKING
4927 case JUMP_TABLE_DATA
:
4934 last
= make_insn_raw (x
);
4942 /* Make an insn of code DEBUG_INSN with pattern X
4943 and add it to the end of the doubly-linked list. */
4946 emit_debug_insn (rtx x
)
4948 rtx_insn
*last
= get_last_insn ();
4954 switch (GET_CODE (x
))
4963 insn
= as_a
<rtx_insn
*> (x
);
4966 rtx_insn
*next
= NEXT_INSN (insn
);
4973 #ifdef ENABLE_RTL_CHECKING
4974 case JUMP_TABLE_DATA
:
4981 last
= make_debug_insn_raw (x
);
4989 /* Make an insn of code JUMP_INSN with pattern X
4990 and add it to the end of the doubly-linked list. */
4993 emit_jump_insn (rtx x
)
4995 rtx_insn
*last
= NULL
;
4998 switch (GET_CODE (x
))
5007 insn
= as_a
<rtx_insn
*> (x
);
5010 rtx_insn
*next
= NEXT_INSN (insn
);
5017 #ifdef ENABLE_RTL_CHECKING
5018 case JUMP_TABLE_DATA
:
5025 last
= make_jump_insn_raw (x
);
5033 /* Make an insn of code CALL_INSN with pattern X
5034 and add it to the end of the doubly-linked list. */
5037 emit_call_insn (rtx x
)
5041 switch (GET_CODE (x
))
5050 insn
= emit_insn (x
);
5053 #ifdef ENABLE_RTL_CHECKING
5055 case JUMP_TABLE_DATA
:
5061 insn
= make_call_insn_raw (x
);
5069 /* Add the label LABEL to the end of the doubly-linked list. */
5072 emit_label (rtx uncast_label
)
5074 rtx_code_label
*label
= as_a
<rtx_code_label
*> (uncast_label
);
5076 gcc_checking_assert (INSN_UID (label
) == 0);
5077 INSN_UID (label
) = cur_insn_uid
++;
5082 /* Make an insn of code JUMP_TABLE_DATA
5083 and add it to the end of the doubly-linked list. */
5085 rtx_jump_table_data
*
5086 emit_jump_table_data (rtx table
)
5088 rtx_jump_table_data
*jump_table_data
=
5089 as_a
<rtx_jump_table_data
*> (rtx_alloc (JUMP_TABLE_DATA
));
5090 INSN_UID (jump_table_data
) = cur_insn_uid
++;
5091 PATTERN (jump_table_data
) = table
;
5092 BLOCK_FOR_INSN (jump_table_data
) = NULL
;
5093 add_insn (jump_table_data
);
5094 return jump_table_data
;
5097 /* Make an insn of code BARRIER
5098 and add it to the end of the doubly-linked list. */
5103 rtx_barrier
*barrier
= as_a
<rtx_barrier
*> (rtx_alloc (BARRIER
));
5104 INSN_UID (barrier
) = cur_insn_uid
++;
5109 /* Emit a copy of note ORIG. */
5112 emit_note_copy (rtx_note
*orig
)
5114 enum insn_note kind
= (enum insn_note
) NOTE_KIND (orig
);
5115 rtx_note
*note
= make_note_raw (kind
);
5116 NOTE_DATA (note
) = NOTE_DATA (orig
);
5121 /* Make an insn of code NOTE or type NOTE_NO
5122 and add it to the end of the doubly-linked list. */
5125 emit_note (enum insn_note kind
)
5127 rtx_note
*note
= make_note_raw (kind
);
5132 /* Emit a clobber of lvalue X. */
5135 emit_clobber (rtx x
)
5137 /* CONCATs should not appear in the insn stream. */
5138 if (GET_CODE (x
) == CONCAT
)
5140 emit_clobber (XEXP (x
, 0));
5141 return emit_clobber (XEXP (x
, 1));
5143 return emit_insn (gen_rtx_CLOBBER (VOIDmode
, x
));
5146 /* Return a sequence of insns to clobber lvalue X. */
5160 /* Emit a use of rvalue X. */
5165 /* CONCATs should not appear in the insn stream. */
5166 if (GET_CODE (x
) == CONCAT
)
5168 emit_use (XEXP (x
, 0));
5169 return emit_use (XEXP (x
, 1));
5171 return emit_insn (gen_rtx_USE (VOIDmode
, x
));
5174 /* Return a sequence of insns to use rvalue X. */
5188 /* Notes like REG_EQUAL and REG_EQUIV refer to a set in an instruction.
5189 Return the set in INSN that such notes describe, or NULL if the notes
5190 have no meaning for INSN. */
5193 set_for_reg_notes (rtx insn
)
5200 pat
= PATTERN (insn
);
5201 if (GET_CODE (pat
) == PARALLEL
)
5203 /* We do not use single_set because that ignores SETs of unused
5204 registers. REG_EQUAL and REG_EQUIV notes really do require the
5205 PARALLEL to have a single SET. */
5206 if (multiple_sets (insn
))
5208 pat
= XVECEXP (pat
, 0, 0);
5211 if (GET_CODE (pat
) != SET
)
5214 reg
= SET_DEST (pat
);
5216 /* Notes apply to the contents of a STRICT_LOW_PART. */
5217 if (GET_CODE (reg
) == STRICT_LOW_PART
5218 || GET_CODE (reg
) == ZERO_EXTRACT
)
5219 reg
= XEXP (reg
, 0);
5221 /* Check that we have a register. */
5222 if (!(REG_P (reg
) || GET_CODE (reg
) == SUBREG
))
5228 /* Place a note of KIND on insn INSN with DATUM as the datum. If a
5229 note of this type already exists, remove it first. */
5232 set_unique_reg_note (rtx insn
, enum reg_note kind
, rtx datum
)
5234 rtx note
= find_reg_note (insn
, kind
, NULL_RTX
);
5240 /* We need to support the REG_EQUAL on USE trick of find_reloads. */
5241 if (!set_for_reg_notes (insn
) && GET_CODE (PATTERN (insn
)) != USE
)
5244 /* Don't add ASM_OPERAND REG_EQUAL/REG_EQUIV notes.
5245 It serves no useful purpose and breaks eliminate_regs. */
5246 if (GET_CODE (datum
) == ASM_OPERANDS
)
5249 /* Notes with side effects are dangerous. Even if the side-effect
5250 initially mirrors one in PATTERN (INSN), later optimizations
5251 might alter the way that the final register value is calculated
5252 and so move or alter the side-effect in some way. The note would
5253 then no longer be a valid substitution for SET_SRC. */
5254 if (side_effects_p (datum
))
5263 XEXP (note
, 0) = datum
;
5266 add_reg_note (insn
, kind
, datum
);
5267 note
= REG_NOTES (insn
);
5274 df_notes_rescan (as_a
<rtx_insn
*> (insn
));
5283 /* Like set_unique_reg_note, but don't do anything unless INSN sets DST. */
5285 set_dst_reg_note (rtx insn
, enum reg_note kind
, rtx datum
, rtx dst
)
5287 rtx set
= set_for_reg_notes (insn
);
5289 if (set
&& SET_DEST (set
) == dst
)
5290 return set_unique_reg_note (insn
, kind
, datum
);
5294 /* Emit the rtl pattern X as an appropriate kind of insn. Also emit a
5295 following barrier if the instruction needs one and if ALLOW_BARRIER_P
5298 If X is a label, it is simply added into the insn chain. */
5301 emit (rtx x
, bool allow_barrier_p
)
5303 enum rtx_code code
= classify_insn (x
);
5308 return emit_label (x
);
5310 return emit_insn (x
);
5313 rtx_insn
*insn
= emit_jump_insn (x
);
5315 && (any_uncondjump_p (insn
) || GET_CODE (x
) == RETURN
))
5316 return emit_barrier ();
5320 return emit_call_insn (x
);
5322 return emit_debug_insn (x
);
5328 /* Space for free sequence stack entries. */
5329 static GTY ((deletable
)) struct sequence_stack
*free_sequence_stack
;
5331 /* Begin emitting insns to a sequence. If this sequence will contain
5332 something that might cause the compiler to pop arguments to function
5333 calls (because those pops have previously been deferred; see
5334 INHIBIT_DEFER_POP for more details), use do_pending_stack_adjust
5335 before calling this function. That will ensure that the deferred
5336 pops are not accidentally emitted in the middle of this sequence. */
5339 start_sequence (void)
5341 struct sequence_stack
*tem
;
5343 if (free_sequence_stack
!= NULL
)
5345 tem
= free_sequence_stack
;
5346 free_sequence_stack
= tem
->next
;
5349 tem
= ggc_alloc
<sequence_stack
> ();
5351 tem
->next
= get_current_sequence ()->next
;
5352 tem
->first
= get_insns ();
5353 tem
->last
= get_last_insn ();
5354 get_current_sequence ()->next
= tem
;
5360 /* Set up the insn chain starting with FIRST as the current sequence,
5361 saving the previously current one. See the documentation for
5362 start_sequence for more information about how to use this function. */
5365 push_to_sequence (rtx_insn
*first
)
5371 for (last
= first
; last
&& NEXT_INSN (last
); last
= NEXT_INSN (last
))
5374 set_first_insn (first
);
5375 set_last_insn (last
);
5378 /* Like push_to_sequence, but take the last insn as an argument to avoid
5379 looping through the list. */
5382 push_to_sequence2 (rtx_insn
*first
, rtx_insn
*last
)
5386 set_first_insn (first
);
5387 set_last_insn (last
);
5390 /* Set up the outer-level insn chain
5391 as the current sequence, saving the previously current one. */
5394 push_topmost_sequence (void)
5396 struct sequence_stack
*top
;
5400 top
= get_topmost_sequence ();
5401 set_first_insn (top
->first
);
5402 set_last_insn (top
->last
);
5405 /* After emitting to the outer-level insn chain, update the outer-level
5406 insn chain, and restore the previous saved state. */
5409 pop_topmost_sequence (void)
5411 struct sequence_stack
*top
;
5413 top
= get_topmost_sequence ();
5414 top
->first
= get_insns ();
5415 top
->last
= get_last_insn ();
5420 /* After emitting to a sequence, restore previous saved state.
5422 To get the contents of the sequence just made, you must call
5423 `get_insns' *before* calling here.
5425 If the compiler might have deferred popping arguments while
5426 generating this sequence, and this sequence will not be immediately
5427 inserted into the instruction stream, use do_pending_stack_adjust
5428 before calling get_insns. That will ensure that the deferred
5429 pops are inserted into this sequence, and not into some random
5430 location in the instruction stream. See INHIBIT_DEFER_POP for more
5431 information about deferred popping of arguments. */
5436 struct sequence_stack
*tem
= get_current_sequence ()->next
;
5438 set_first_insn (tem
->first
);
5439 set_last_insn (tem
->last
);
5440 get_current_sequence ()->next
= tem
->next
;
5442 memset (tem
, 0, sizeof (*tem
));
5443 tem
->next
= free_sequence_stack
;
5444 free_sequence_stack
= tem
;
5447 /* Return 1 if currently emitting into a sequence. */
5450 in_sequence_p (void)
5452 return get_current_sequence ()->next
!= 0;
5455 /* Put the various virtual registers into REGNO_REG_RTX. */
5458 init_virtual_regs (void)
5460 regno_reg_rtx
[VIRTUAL_INCOMING_ARGS_REGNUM
] = virtual_incoming_args_rtx
;
5461 regno_reg_rtx
[VIRTUAL_STACK_VARS_REGNUM
] = virtual_stack_vars_rtx
;
5462 regno_reg_rtx
[VIRTUAL_STACK_DYNAMIC_REGNUM
] = virtual_stack_dynamic_rtx
;
5463 regno_reg_rtx
[VIRTUAL_OUTGOING_ARGS_REGNUM
] = virtual_outgoing_args_rtx
;
5464 regno_reg_rtx
[VIRTUAL_CFA_REGNUM
] = virtual_cfa_rtx
;
5465 regno_reg_rtx
[VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM
]
5466 = virtual_preferred_stack_boundary_rtx
;
5470 /* Used by copy_insn_1 to avoid copying SCRATCHes more than once. */
5471 static rtx copy_insn_scratch_in
[MAX_RECOG_OPERANDS
];
5472 static rtx copy_insn_scratch_out
[MAX_RECOG_OPERANDS
];
5473 static int copy_insn_n_scratches
;
5475 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5476 copied an ASM_OPERANDS.
5477 In that case, it is the original input-operand vector. */
5478 static rtvec orig_asm_operands_vector
;
5480 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5481 copied an ASM_OPERANDS.
5482 In that case, it is the copied input-operand vector. */
5483 static rtvec copy_asm_operands_vector
;
5485 /* Likewise for the constraints vector. */
5486 static rtvec orig_asm_constraints_vector
;
5487 static rtvec copy_asm_constraints_vector
;
5489 /* Recursively create a new copy of an rtx for copy_insn.
5490 This function differs from copy_rtx in that it handles SCRATCHes and
5491 ASM_OPERANDs properly.
5492 Normally, this function is not used directly; use copy_insn as front end.
5493 However, you could first copy an insn pattern with copy_insn and then use
5494 this function afterwards to properly copy any REG_NOTEs containing
5498 copy_insn_1 (rtx orig
)
5503 const char *format_ptr
;
5508 code
= GET_CODE (orig
);
5523 /* Share clobbers of hard registers (like cc0), but do not share pseudo reg
5524 clobbers or clobbers of hard registers that originated as pseudos.
5525 This is needed to allow safe register renaming. */
5526 if (REG_P (XEXP (orig
, 0))
5527 && HARD_REGISTER_NUM_P (REGNO (XEXP (orig
, 0)))
5528 && HARD_REGISTER_NUM_P (ORIGINAL_REGNO (XEXP (orig
, 0))))
5533 for (i
= 0; i
< copy_insn_n_scratches
; i
++)
5534 if (copy_insn_scratch_in
[i
] == orig
)
5535 return copy_insn_scratch_out
[i
];
5539 if (shared_const_p (orig
))
5543 /* A MEM with a constant address is not sharable. The problem is that
5544 the constant address may need to be reloaded. If the mem is shared,
5545 then reloading one copy of this mem will cause all copies to appear
5546 to have been reloaded. */
5552 /* Copy the various flags, fields, and other information. We assume
5553 that all fields need copying, and then clear the fields that should
5554 not be copied. That is the sensible default behavior, and forces
5555 us to explicitly document why we are *not* copying a flag. */
5556 copy
= shallow_copy_rtx (orig
);
5558 /* We do not copy JUMP, CALL, or FRAME_RELATED for INSNs. */
5561 RTX_FLAG (copy
, jump
) = 0;
5562 RTX_FLAG (copy
, call
) = 0;
5563 RTX_FLAG (copy
, frame_related
) = 0;
5566 format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
5568 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
5569 switch (*format_ptr
++)
5572 if (XEXP (orig
, i
) != NULL
)
5573 XEXP (copy
, i
) = copy_insn_1 (XEXP (orig
, i
));
5578 if (XVEC (orig
, i
) == orig_asm_constraints_vector
)
5579 XVEC (copy
, i
) = copy_asm_constraints_vector
;
5580 else if (XVEC (orig
, i
) == orig_asm_operands_vector
)
5581 XVEC (copy
, i
) = copy_asm_operands_vector
;
5582 else if (XVEC (orig
, i
) != NULL
)
5584 XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
5585 for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
5586 XVECEXP (copy
, i
, j
) = copy_insn_1 (XVECEXP (orig
, i
, j
));
5597 /* These are left unchanged. */
5604 if (code
== SCRATCH
)
5606 i
= copy_insn_n_scratches
++;
5607 gcc_assert (i
< MAX_RECOG_OPERANDS
);
5608 copy_insn_scratch_in
[i
] = orig
;
5609 copy_insn_scratch_out
[i
] = copy
;
5611 else if (code
== ASM_OPERANDS
)
5613 orig_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (orig
);
5614 copy_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (copy
);
5615 orig_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (orig
);
5616 copy_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (copy
);
5622 /* Create a new copy of an rtx.
5623 This function differs from copy_rtx in that it handles SCRATCHes and
5624 ASM_OPERANDs properly.
5625 INSN doesn't really have to be a full INSN; it could be just the
5628 copy_insn (rtx insn
)
5630 copy_insn_n_scratches
= 0;
5631 orig_asm_operands_vector
= 0;
5632 orig_asm_constraints_vector
= 0;
5633 copy_asm_operands_vector
= 0;
5634 copy_asm_constraints_vector
= 0;
5635 return copy_insn_1 (insn
);
5638 /* Return a copy of INSN that can be used in a SEQUENCE delay slot,
5639 on that assumption that INSN itself remains in its original place. */
5642 copy_delay_slot_insn (rtx_insn
*insn
)
5644 /* Copy INSN with its rtx_code, all its notes, location etc. */
5645 insn
= as_a
<rtx_insn
*> (copy_rtx (insn
));
5646 INSN_UID (insn
) = cur_insn_uid
++;
5650 /* Initialize data structures and variables in this file
5651 before generating rtl for each function. */
5656 set_first_insn (NULL
);
5657 set_last_insn (NULL
);
5658 if (MIN_NONDEBUG_INSN_UID
)
5659 cur_insn_uid
= MIN_NONDEBUG_INSN_UID
;
5662 cur_debug_insn_uid
= 1;
5663 reg_rtx_no
= LAST_VIRTUAL_REGISTER
+ 1;
5664 first_label_num
= label_num
;
5665 get_current_sequence ()->next
= NULL
;
5667 /* Init the tables that describe all the pseudo regs. */
5669 crtl
->emit
.regno_pointer_align_length
= LAST_VIRTUAL_REGISTER
+ 101;
5671 crtl
->emit
.regno_pointer_align
5672 = XCNEWVEC (unsigned char, crtl
->emit
.regno_pointer_align_length
);
5674 regno_reg_rtx
= ggc_vec_alloc
<rtx
> (crtl
->emit
.regno_pointer_align_length
);
5676 /* Put copies of all the hard registers into regno_reg_rtx. */
5677 memcpy (regno_reg_rtx
,
5678 initial_regno_reg_rtx
,
5679 FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
5681 /* Put copies of all the virtual register rtx into regno_reg_rtx. */
5682 init_virtual_regs ();
5684 /* Indicate that the virtual registers and stack locations are
5686 REG_POINTER (stack_pointer_rtx
) = 1;
5687 REG_POINTER (frame_pointer_rtx
) = 1;
5688 REG_POINTER (hard_frame_pointer_rtx
) = 1;
5689 REG_POINTER (arg_pointer_rtx
) = 1;
5691 REG_POINTER (virtual_incoming_args_rtx
) = 1;
5692 REG_POINTER (virtual_stack_vars_rtx
) = 1;
5693 REG_POINTER (virtual_stack_dynamic_rtx
) = 1;
5694 REG_POINTER (virtual_outgoing_args_rtx
) = 1;
5695 REG_POINTER (virtual_cfa_rtx
) = 1;
5697 #ifdef STACK_BOUNDARY
5698 REGNO_POINTER_ALIGN (STACK_POINTER_REGNUM
) = STACK_BOUNDARY
;
5699 REGNO_POINTER_ALIGN (FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5700 REGNO_POINTER_ALIGN (HARD_FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5701 REGNO_POINTER_ALIGN (ARG_POINTER_REGNUM
) = STACK_BOUNDARY
;
5703 REGNO_POINTER_ALIGN (VIRTUAL_INCOMING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5704 REGNO_POINTER_ALIGN (VIRTUAL_STACK_VARS_REGNUM
) = STACK_BOUNDARY
;
5705 REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM
) = STACK_BOUNDARY
;
5706 REGNO_POINTER_ALIGN (VIRTUAL_OUTGOING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5707 REGNO_POINTER_ALIGN (VIRTUAL_CFA_REGNUM
) = BITS_PER_WORD
;
5710 #ifdef INIT_EXPANDERS
5715 /* Generate a vector constant for mode MODE and constant value CONSTANT. */
5718 gen_const_vector (machine_mode mode
, int constant
)
5725 units
= GET_MODE_NUNITS (mode
);
5726 inner
= GET_MODE_INNER (mode
);
5728 gcc_assert (!DECIMAL_FLOAT_MODE_P (inner
));
5730 v
= rtvec_alloc (units
);
5732 /* We need to call this function after we set the scalar const_tiny_rtx
5734 gcc_assert (const_tiny_rtx
[constant
][(int) inner
]);
5736 for (i
= 0; i
< units
; ++i
)
5737 RTVEC_ELT (v
, i
) = const_tiny_rtx
[constant
][(int) inner
];
5739 tem
= gen_rtx_raw_CONST_VECTOR (mode
, v
);
5743 /* Generate a vector like gen_rtx_raw_CONST_VEC, but use the zero vector when
5744 all elements are zero, and the one vector when all elements are one. */
5746 gen_rtx_CONST_VECTOR (machine_mode mode
, rtvec v
)
5748 machine_mode inner
= GET_MODE_INNER (mode
);
5749 int nunits
= GET_MODE_NUNITS (mode
);
5753 /* Check to see if all of the elements have the same value. */
5754 x
= RTVEC_ELT (v
, nunits
- 1);
5755 for (i
= nunits
- 2; i
>= 0; i
--)
5756 if (RTVEC_ELT (v
, i
) != x
)
5759 /* If the values are all the same, check to see if we can use one of the
5760 standard constant vectors. */
5763 if (x
== CONST0_RTX (inner
))
5764 return CONST0_RTX (mode
);
5765 else if (x
== CONST1_RTX (inner
))
5766 return CONST1_RTX (mode
);
5767 else if (x
== CONSTM1_RTX (inner
))
5768 return CONSTM1_RTX (mode
);
5771 return gen_rtx_raw_CONST_VECTOR (mode
, v
);
5774 /* Initialise global register information required by all functions. */
5777 init_emit_regs (void)
5783 /* Reset register attributes */
5784 reg_attrs_htab
->empty ();
5786 /* We need reg_raw_mode, so initialize the modes now. */
5787 init_reg_modes_target ();
5789 /* Assign register numbers to the globally defined register rtx. */
5790 stack_pointer_rtx
= gen_raw_REG (Pmode
, STACK_POINTER_REGNUM
);
5791 frame_pointer_rtx
= gen_raw_REG (Pmode
, FRAME_POINTER_REGNUM
);
5792 hard_frame_pointer_rtx
= gen_raw_REG (Pmode
, HARD_FRAME_POINTER_REGNUM
);
5793 arg_pointer_rtx
= gen_raw_REG (Pmode
, ARG_POINTER_REGNUM
);
5794 virtual_incoming_args_rtx
=
5795 gen_raw_REG (Pmode
, VIRTUAL_INCOMING_ARGS_REGNUM
);
5796 virtual_stack_vars_rtx
=
5797 gen_raw_REG (Pmode
, VIRTUAL_STACK_VARS_REGNUM
);
5798 virtual_stack_dynamic_rtx
=
5799 gen_raw_REG (Pmode
, VIRTUAL_STACK_DYNAMIC_REGNUM
);
5800 virtual_outgoing_args_rtx
=
5801 gen_raw_REG (Pmode
, VIRTUAL_OUTGOING_ARGS_REGNUM
);
5802 virtual_cfa_rtx
= gen_raw_REG (Pmode
, VIRTUAL_CFA_REGNUM
);
5803 virtual_preferred_stack_boundary_rtx
=
5804 gen_raw_REG (Pmode
, VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM
);
5806 /* Initialize RTL for commonly used hard registers. These are
5807 copied into regno_reg_rtx as we begin to compile each function. */
5808 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
5809 initial_regno_reg_rtx
[i
] = gen_raw_REG (reg_raw_mode
[i
], i
);
5811 #ifdef RETURN_ADDRESS_POINTER_REGNUM
5812 return_address_pointer_rtx
5813 = gen_raw_REG (Pmode
, RETURN_ADDRESS_POINTER_REGNUM
);
5816 pic_offset_table_rtx
= NULL_RTX
;
5817 if ((unsigned) PIC_OFFSET_TABLE_REGNUM
!= INVALID_REGNUM
)
5818 pic_offset_table_rtx
= gen_raw_REG (Pmode
, PIC_OFFSET_TABLE_REGNUM
);
5820 for (i
= 0; i
< (int) MAX_MACHINE_MODE
; i
++)
5822 mode
= (machine_mode
) i
;
5823 attrs
= ggc_cleared_alloc
<mem_attrs
> ();
5824 attrs
->align
= BITS_PER_UNIT
;
5825 attrs
->addrspace
= ADDR_SPACE_GENERIC
;
5826 if (mode
!= BLKmode
)
5828 attrs
->size_known_p
= true;
5829 attrs
->size
= GET_MODE_SIZE (mode
);
5830 if (STRICT_ALIGNMENT
)
5831 attrs
->align
= GET_MODE_ALIGNMENT (mode
);
5833 mode_mem_attrs
[i
] = attrs
;
5837 /* Initialize global machine_mode variables. */
5840 init_derived_machine_modes (void)
5842 byte_mode
= VOIDmode
;
5843 word_mode
= VOIDmode
;
5845 for (machine_mode mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5847 mode
= GET_MODE_WIDER_MODE (mode
))
5849 if (GET_MODE_BITSIZE (mode
) == BITS_PER_UNIT
5850 && byte_mode
== VOIDmode
)
5853 if (GET_MODE_BITSIZE (mode
) == BITS_PER_WORD
5854 && word_mode
== VOIDmode
)
5858 ptr_mode
= mode_for_size (POINTER_SIZE
, GET_MODE_CLASS (Pmode
), 0);
5861 /* Create some permanent unique rtl objects shared between all functions. */
5864 init_emit_once (void)
5868 machine_mode double_mode
;
5870 /* Initialize the CONST_INT, CONST_WIDE_INT, CONST_DOUBLE,
5871 CONST_FIXED, and memory attribute hash tables. */
5872 const_int_htab
= hash_table
<const_int_hasher
>::create_ggc (37);
5874 #if TARGET_SUPPORTS_WIDE_INT
5875 const_wide_int_htab
= hash_table
<const_wide_int_hasher
>::create_ggc (37);
5877 const_double_htab
= hash_table
<const_double_hasher
>::create_ggc (37);
5879 const_fixed_htab
= hash_table
<const_fixed_hasher
>::create_ggc (37);
5881 reg_attrs_htab
= hash_table
<reg_attr_hasher
>::create_ggc (37);
5883 #ifdef INIT_EXPANDERS
5884 /* This is to initialize {init|mark|free}_machine_status before the first
5885 call to push_function_context_to. This is needed by the Chill front
5886 end which calls push_function_context_to before the first call to
5887 init_function_start. */
5891 /* Create the unique rtx's for certain rtx codes and operand values. */
5893 /* Process stack-limiting command-line options. */
5894 if (opt_fstack_limit_symbol_arg
!= NULL
)
5896 = gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (opt_fstack_limit_symbol_arg
));
5897 if (opt_fstack_limit_register_no
>= 0)
5898 stack_limit_rtx
= gen_rtx_REG (Pmode
, opt_fstack_limit_register_no
);
5900 /* Don't use gen_rtx_CONST_INT here since gen_rtx_CONST_INT in this case
5901 tries to use these variables. */
5902 for (i
= - MAX_SAVED_CONST_INT
; i
<= MAX_SAVED_CONST_INT
; i
++)
5903 const_int_rtx
[i
+ MAX_SAVED_CONST_INT
] =
5904 gen_rtx_raw_CONST_INT (VOIDmode
, (HOST_WIDE_INT
) i
);
5906 if (STORE_FLAG_VALUE
>= - MAX_SAVED_CONST_INT
5907 && STORE_FLAG_VALUE
<= MAX_SAVED_CONST_INT
)
5908 const_true_rtx
= const_int_rtx
[STORE_FLAG_VALUE
+ MAX_SAVED_CONST_INT
];
5910 const_true_rtx
= gen_rtx_CONST_INT (VOIDmode
, STORE_FLAG_VALUE
);
5912 double_mode
= mode_for_size (DOUBLE_TYPE_SIZE
, MODE_FLOAT
, 0);
5914 real_from_integer (&dconst0
, double_mode
, 0, SIGNED
);
5915 real_from_integer (&dconst1
, double_mode
, 1, SIGNED
);
5916 real_from_integer (&dconst2
, double_mode
, 2, SIGNED
);
5921 dconsthalf
= dconst1
;
5922 SET_REAL_EXP (&dconsthalf
, REAL_EXP (&dconsthalf
) - 1);
5924 for (i
= 0; i
< 3; i
++)
5926 const REAL_VALUE_TYPE
*const r
=
5927 (i
== 0 ? &dconst0
: i
== 1 ? &dconst1
: &dconst2
);
5929 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
5931 mode
= GET_MODE_WIDER_MODE (mode
))
5932 const_tiny_rtx
[i
][(int) mode
] =
5933 const_double_from_real_value (*r
, mode
);
5935 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_DECIMAL_FLOAT
);
5937 mode
= GET_MODE_WIDER_MODE (mode
))
5938 const_tiny_rtx
[i
][(int) mode
] =
5939 const_double_from_real_value (*r
, mode
);
5941 const_tiny_rtx
[i
][(int) VOIDmode
] = GEN_INT (i
);
5943 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5945 mode
= GET_MODE_WIDER_MODE (mode
))
5946 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5948 for (mode
= MIN_MODE_PARTIAL_INT
;
5949 mode
<= MAX_MODE_PARTIAL_INT
;
5950 mode
= (machine_mode
)((int)(mode
) + 1))
5951 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5954 const_tiny_rtx
[3][(int) VOIDmode
] = constm1_rtx
;
5956 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
5958 mode
= GET_MODE_WIDER_MODE (mode
))
5959 const_tiny_rtx
[3][(int) mode
] = constm1_rtx
;
5961 for (mode
= MIN_MODE_PARTIAL_INT
;
5962 mode
<= MAX_MODE_PARTIAL_INT
;
5963 mode
= (machine_mode
)((int)(mode
) + 1))
5964 const_tiny_rtx
[3][(int) mode
] = constm1_rtx
;
5966 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_COMPLEX_INT
);
5968 mode
= GET_MODE_WIDER_MODE (mode
))
5970 rtx inner
= const_tiny_rtx
[0][(int)GET_MODE_INNER (mode
)];
5971 const_tiny_rtx
[0][(int) mode
] = gen_rtx_CONCAT (mode
, inner
, inner
);
5974 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_COMPLEX_FLOAT
);
5976 mode
= GET_MODE_WIDER_MODE (mode
))
5978 rtx inner
= const_tiny_rtx
[0][(int)GET_MODE_INNER (mode
)];
5979 const_tiny_rtx
[0][(int) mode
] = gen_rtx_CONCAT (mode
, inner
, inner
);
5982 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
5984 mode
= GET_MODE_WIDER_MODE (mode
))
5986 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
5987 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
5988 const_tiny_rtx
[3][(int) mode
] = gen_const_vector (mode
, 3);
5991 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
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 (mode
= GET_CLASS_NARROWEST_MODE (MODE_FRACT
);
6001 mode
= GET_MODE_WIDER_MODE (mode
))
6003 FCONST0 (mode
).data
.high
= 0;
6004 FCONST0 (mode
).data
.low
= 0;
6005 FCONST0 (mode
).mode
= mode
;
6006 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6007 FCONST0 (mode
), mode
);
6010 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_UFRACT
);
6012 mode
= GET_MODE_WIDER_MODE (mode
))
6014 FCONST0 (mode
).data
.high
= 0;
6015 FCONST0 (mode
).data
.low
= 0;
6016 FCONST0 (mode
).mode
= mode
;
6017 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6018 FCONST0 (mode
), mode
);
6021 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_ACCUM
);
6023 mode
= GET_MODE_WIDER_MODE (mode
))
6025 FCONST0 (mode
).data
.high
= 0;
6026 FCONST0 (mode
).data
.low
= 0;
6027 FCONST0 (mode
).mode
= mode
;
6028 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6029 FCONST0 (mode
), mode
);
6031 /* We store the value 1. */
6032 FCONST1 (mode
).data
.high
= 0;
6033 FCONST1 (mode
).data
.low
= 0;
6034 FCONST1 (mode
).mode
= mode
;
6036 = double_int_one
.lshift (GET_MODE_FBIT (mode
),
6037 HOST_BITS_PER_DOUBLE_INT
,
6038 SIGNED_FIXED_POINT_MODE_P (mode
));
6039 const_tiny_rtx
[1][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6040 FCONST1 (mode
), mode
);
6043 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_UACCUM
);
6045 mode
= GET_MODE_WIDER_MODE (mode
))
6047 FCONST0 (mode
).data
.high
= 0;
6048 FCONST0 (mode
).data
.low
= 0;
6049 FCONST0 (mode
).mode
= mode
;
6050 const_tiny_rtx
[0][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6051 FCONST0 (mode
), mode
);
6053 /* We store the value 1. */
6054 FCONST1 (mode
).data
.high
= 0;
6055 FCONST1 (mode
).data
.low
= 0;
6056 FCONST1 (mode
).mode
= mode
;
6058 = double_int_one
.lshift (GET_MODE_FBIT (mode
),
6059 HOST_BITS_PER_DOUBLE_INT
,
6060 SIGNED_FIXED_POINT_MODE_P (mode
));
6061 const_tiny_rtx
[1][(int) mode
] = CONST_FIXED_FROM_FIXED_VALUE (
6062 FCONST1 (mode
), mode
);
6065 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FRACT
);
6067 mode
= GET_MODE_WIDER_MODE (mode
))
6069 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
6072 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_UFRACT
);
6074 mode
= GET_MODE_WIDER_MODE (mode
))
6076 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
6079 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_ACCUM
);
6081 mode
= GET_MODE_WIDER_MODE (mode
))
6083 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
6084 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
6087 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_UACCUM
);
6089 mode
= GET_MODE_WIDER_MODE (mode
))
6091 const_tiny_rtx
[0][(int) mode
] = gen_const_vector (mode
, 0);
6092 const_tiny_rtx
[1][(int) mode
] = gen_const_vector (mode
, 1);
6095 for (i
= (int) CCmode
; i
< (int) MAX_MACHINE_MODE
; ++i
)
6096 if (GET_MODE_CLASS ((machine_mode
) i
) == MODE_CC
)
6097 const_tiny_rtx
[0][i
] = const0_rtx
;
6099 const_tiny_rtx
[0][(int) BImode
] = const0_rtx
;
6100 if (STORE_FLAG_VALUE
== 1)
6101 const_tiny_rtx
[1][(int) BImode
] = const1_rtx
;
6103 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_POINTER_BOUNDS
);
6105 mode
= GET_MODE_WIDER_MODE (mode
))
6107 wide_int wi_zero
= wi::zero (GET_MODE_PRECISION (mode
));
6108 const_tiny_rtx
[0][mode
] = immed_wide_int_const (wi_zero
, mode
);
6111 pc_rtx
= gen_rtx_fmt_ (PC
, VOIDmode
);
6112 ret_rtx
= gen_rtx_fmt_ (RETURN
, VOIDmode
);
6113 simple_return_rtx
= gen_rtx_fmt_ (SIMPLE_RETURN
, VOIDmode
);
6114 cc0_rtx
= gen_rtx_fmt_ (CC0
, VOIDmode
);
6115 invalid_insn_rtx
= gen_rtx_INSN (VOIDmode
,
6119 /*pattern=*/NULL_RTX
,
6122 /*reg_notes=*/NULL_RTX
);
6125 /* Produce exact duplicate of insn INSN after AFTER.
6126 Care updating of libcall regions if present. */
6129 emit_copy_of_insn_after (rtx_insn
*insn
, rtx_insn
*after
)
6134 switch (GET_CODE (insn
))
6137 new_rtx
= emit_insn_after (copy_insn (PATTERN (insn
)), after
);
6141 new_rtx
= emit_jump_insn_after (copy_insn (PATTERN (insn
)), after
);
6142 CROSSING_JUMP_P (new_rtx
) = CROSSING_JUMP_P (insn
);
6146 new_rtx
= emit_debug_insn_after (copy_insn (PATTERN (insn
)), after
);
6150 new_rtx
= emit_call_insn_after (copy_insn (PATTERN (insn
)), after
);
6151 if (CALL_INSN_FUNCTION_USAGE (insn
))
6152 CALL_INSN_FUNCTION_USAGE (new_rtx
)
6153 = copy_insn (CALL_INSN_FUNCTION_USAGE (insn
));
6154 SIBLING_CALL_P (new_rtx
) = SIBLING_CALL_P (insn
);
6155 RTL_CONST_CALL_P (new_rtx
) = RTL_CONST_CALL_P (insn
);
6156 RTL_PURE_CALL_P (new_rtx
) = RTL_PURE_CALL_P (insn
);
6157 RTL_LOOPING_CONST_OR_PURE_CALL_P (new_rtx
)
6158 = RTL_LOOPING_CONST_OR_PURE_CALL_P (insn
);
6165 /* Update LABEL_NUSES. */
6166 mark_jump_label (PATTERN (new_rtx
), new_rtx
, 0);
6168 INSN_LOCATION (new_rtx
) = INSN_LOCATION (insn
);
6170 /* If the old insn is frame related, then so is the new one. This is
6171 primarily needed for IA-64 unwind info which marks epilogue insns,
6172 which may be duplicated by the basic block reordering code. */
6173 RTX_FRAME_RELATED_P (new_rtx
) = RTX_FRAME_RELATED_P (insn
);
6175 /* Locate the end of existing REG_NOTES in NEW_RTX. */
6176 rtx
*ptail
= ®_NOTES (new_rtx
);
6177 while (*ptail
!= NULL_RTX
)
6178 ptail
= &XEXP (*ptail
, 1);
6180 /* Copy all REG_NOTES except REG_LABEL_OPERAND since mark_jump_label
6181 will make them. REG_LABEL_TARGETs are created there too, but are
6182 supposed to be sticky, so we copy them. */
6183 for (link
= REG_NOTES (insn
); link
; link
= XEXP (link
, 1))
6184 if (REG_NOTE_KIND (link
) != REG_LABEL_OPERAND
)
6186 *ptail
= duplicate_reg_note (link
);
6187 ptail
= &XEXP (*ptail
, 1);
6190 INSN_CODE (new_rtx
) = INSN_CODE (insn
);
6194 static GTY((deletable
)) rtx hard_reg_clobbers
[NUM_MACHINE_MODES
][FIRST_PSEUDO_REGISTER
];
6196 gen_hard_reg_clobber (machine_mode mode
, unsigned int regno
)
6198 if (hard_reg_clobbers
[mode
][regno
])
6199 return hard_reg_clobbers
[mode
][regno
];
6201 return (hard_reg_clobbers
[mode
][regno
] =
6202 gen_rtx_CLOBBER (VOIDmode
, gen_rtx_REG (mode
, regno
)));
6205 location_t prologue_location
;
6206 location_t epilogue_location
;
6208 /* Hold current location information and last location information, so the
6209 datastructures are built lazily only when some instructions in given
6210 place are needed. */
6211 static location_t curr_location
;
6213 /* Allocate insn location datastructure. */
6215 insn_locations_init (void)
6217 prologue_location
= epilogue_location
= 0;
6218 curr_location
= UNKNOWN_LOCATION
;
6221 /* At the end of emit stage, clear current location. */
6223 insn_locations_finalize (void)
6225 epilogue_location
= curr_location
;
6226 curr_location
= UNKNOWN_LOCATION
;
6229 /* Set current location. */
6231 set_curr_insn_location (location_t location
)
6233 curr_location
= location
;
6236 /* Get current location. */
6238 curr_insn_location (void)
6240 return curr_location
;
6243 /* Return lexical scope block insn belongs to. */
6245 insn_scope (const rtx_insn
*insn
)
6247 return LOCATION_BLOCK (INSN_LOCATION (insn
));
6250 /* Return line number of the statement that produced this insn. */
6252 insn_line (const rtx_insn
*insn
)
6254 return LOCATION_LINE (INSN_LOCATION (insn
));
6257 /* Return source file of the statement that produced this insn. */
6259 insn_file (const rtx_insn
*insn
)
6261 return LOCATION_FILE (INSN_LOCATION (insn
));
6264 /* Return expanded location of the statement that produced this insn. */
6266 insn_location (const rtx_insn
*insn
)
6268 return expand_location (INSN_LOCATION (insn
));
6271 /* Return true if memory model MODEL requires a pre-operation (release-style)
6272 barrier or a post-operation (acquire-style) barrier. While not universal,
6273 this function matches behavior of several targets. */
6276 need_atomic_barrier_p (enum memmodel model
, bool pre
)
6278 switch (model
& MEMMODEL_BASE_MASK
)
6280 case MEMMODEL_RELAXED
:
6281 case MEMMODEL_CONSUME
:
6283 case MEMMODEL_RELEASE
:
6285 case MEMMODEL_ACQUIRE
:
6287 case MEMMODEL_ACQ_REL
:
6288 case MEMMODEL_SEQ_CST
:
6295 #include "gt-emit-rtl.h"