1 /* Emit RTL for the GNU C-Compiler expander.
2 Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* Middle-to-low level generation of rtx code and insns.
25 This file contains the functions `gen_rtx', `gen_reg_rtx'
26 and `gen_label_rtx' that are the usual ways of creating rtl
27 expressions for most purposes.
29 It also has the functions for creating insns and linking
30 them in the doubly-linked chain.
32 The patterns of the insns are created by machine-dependent
33 routines in insn-emit.c, which is generated automatically from
34 the machine description. These routines use `gen_rtx' to make
35 the individual rtx's of the pattern; what is machine dependent
36 is the kind of rtx's they make and what arguments they use. */
40 #include "coretypes.h"
50 #include "hard-reg-set.h"
52 #include "insn-config.h"
56 #include "basic-block.h"
59 #include "langhooks.h"
61 /* Commonly used modes. */
63 enum machine_mode byte_mode
; /* Mode whose width is BITS_PER_UNIT. */
64 enum machine_mode word_mode
; /* Mode whose width is BITS_PER_WORD. */
65 enum machine_mode double_mode
; /* Mode whose width is DOUBLE_TYPE_SIZE. */
66 enum machine_mode ptr_mode
; /* Mode whose width is POINTER_SIZE. */
69 /* This is *not* reset after each function. It gives each CODE_LABEL
70 in the entire compilation a unique label number. */
72 static GTY(()) int label_num
= 1;
74 /* Highest label number in current function.
75 Zero means use the value of label_num instead.
76 This is nonzero only when belatedly compiling an inline function. */
78 static int last_label_num
;
80 /* Value label_num had when set_new_first_and_last_label_number was called.
81 If label_num has not changed since then, last_label_num is valid. */
83 static int base_label_num
;
85 /* Nonzero means do not generate NOTEs for source line numbers. */
87 static int no_line_numbers
;
89 /* Commonly used rtx's, so that we only need space for one copy.
90 These are initialized once for the entire compilation.
91 All of these are unique; no other rtx-object will be equal to any
94 rtx global_rtl
[GR_MAX
];
96 /* Commonly used RTL for hard registers. These objects are not necessarily
97 unique, so we allocate them separately from global_rtl. They are
98 initialized once per compilation unit, then copied into regno_reg_rtx
99 at the beginning of each function. */
100 static GTY(()) rtx static_regno_reg_rtx
[FIRST_PSEUDO_REGISTER
];
102 /* We record floating-point CONST_DOUBLEs in each floating-point mode for
103 the values of 0, 1, and 2. For the integer entries and VOIDmode, we
104 record a copy of const[012]_rtx. */
106 rtx const_tiny_rtx
[3][(int) MAX_MACHINE_MODE
];
110 REAL_VALUE_TYPE dconst0
;
111 REAL_VALUE_TYPE dconst1
;
112 REAL_VALUE_TYPE dconst2
;
113 REAL_VALUE_TYPE dconstm1
;
115 /* All references to the following fixed hard registers go through
116 these unique rtl objects. On machines where the frame-pointer and
117 arg-pointer are the same register, they use the same unique object.
119 After register allocation, other rtl objects which used to be pseudo-regs
120 may be clobbered to refer to the frame-pointer register.
121 But references that were originally to the frame-pointer can be
122 distinguished from the others because they contain frame_pointer_rtx.
124 When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
125 tricky: until register elimination has taken place hard_frame_pointer_rtx
126 should be used if it is being set, and frame_pointer_rtx otherwise. After
127 register elimination hard_frame_pointer_rtx should always be used.
128 On machines where the two registers are same (most) then these are the
131 In an inline procedure, the stack and frame pointer rtxs may not be
132 used for anything else. */
133 rtx struct_value_rtx
; /* (REG:Pmode STRUCT_VALUE_REGNUM) */
134 rtx struct_value_incoming_rtx
; /* (REG:Pmode STRUCT_VALUE_INCOMING_REGNUM) */
135 rtx static_chain_rtx
; /* (REG:Pmode STATIC_CHAIN_REGNUM) */
136 rtx static_chain_incoming_rtx
; /* (REG:Pmode STATIC_CHAIN_INCOMING_REGNUM) */
137 rtx pic_offset_table_rtx
; /* (REG:Pmode PIC_OFFSET_TABLE_REGNUM) */
139 /* This is used to implement __builtin_return_address for some machines.
140 See for instance the MIPS port. */
141 rtx return_address_pointer_rtx
; /* (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM) */
143 /* We make one copy of (const_int C) where C is in
144 [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT]
145 to save space during the compilation and simplify comparisons of
148 rtx const_int_rtx
[MAX_SAVED_CONST_INT
* 2 + 1];
150 /* A hash table storing CONST_INTs whose absolute value is greater
151 than MAX_SAVED_CONST_INT. */
153 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
154 htab_t const_int_htab
;
156 /* A hash table storing memory attribute structures. */
157 static GTY ((if_marked ("ggc_marked_p"), param_is (struct mem_attrs
)))
158 htab_t mem_attrs_htab
;
160 /* A hash table storing all CONST_DOUBLEs. */
161 static GTY ((if_marked ("ggc_marked_p"), param_is (struct rtx_def
)))
162 htab_t const_double_htab
;
164 #define first_insn (cfun->emit->x_first_insn)
165 #define last_insn (cfun->emit->x_last_insn)
166 #define cur_insn_uid (cfun->emit->x_cur_insn_uid)
167 #define last_linenum (cfun->emit->x_last_linenum)
168 #define last_filename (cfun->emit->x_last_filename)
169 #define first_label_num (cfun->emit->x_first_label_num)
171 static rtx make_jump_insn_raw
PARAMS ((rtx
));
172 static rtx make_call_insn_raw
PARAMS ((rtx
));
173 static rtx find_line_note
PARAMS ((rtx
));
174 static rtx change_address_1
PARAMS ((rtx
, enum machine_mode
, rtx
,
176 static void unshare_all_rtl_1
PARAMS ((rtx
));
177 static void unshare_all_decls
PARAMS ((tree
));
178 static void reset_used_decls
PARAMS ((tree
));
179 static void mark_label_nuses
PARAMS ((rtx
));
180 static hashval_t const_int_htab_hash
PARAMS ((const void *));
181 static int const_int_htab_eq
PARAMS ((const void *,
183 static hashval_t const_double_htab_hash
PARAMS ((const void *));
184 static int const_double_htab_eq
PARAMS ((const void *,
186 static rtx lookup_const_double
PARAMS ((rtx
));
187 static hashval_t mem_attrs_htab_hash
PARAMS ((const void *));
188 static int mem_attrs_htab_eq
PARAMS ((const void *,
190 static mem_attrs
*get_mem_attrs
PARAMS ((HOST_WIDE_INT
, tree
, rtx
,
193 static tree component_ref_for_mem_expr
PARAMS ((tree
));
194 static rtx gen_const_vector_0
PARAMS ((enum machine_mode
));
196 /* Probability of the conditional branch currently proceeded by try_split.
197 Set to -1 otherwise. */
198 int split_branch_probability
= -1;
200 /* Returns a hash code for X (which is a really a CONST_INT). */
203 const_int_htab_hash (x
)
206 return (hashval_t
) INTVAL ((struct rtx_def
*) x
);
209 /* Returns nonzero if the value represented by X (which is really a
210 CONST_INT) is the same as that given by Y (which is really a
214 const_int_htab_eq (x
, y
)
218 return (INTVAL ((rtx
) x
) == *((const HOST_WIDE_INT
*) y
));
221 /* Returns a hash code for X (which is really a CONST_DOUBLE). */
223 const_double_htab_hash (x
)
229 if (GET_MODE (value
) == VOIDmode
)
230 h
= CONST_DOUBLE_LOW (value
) ^ CONST_DOUBLE_HIGH (value
);
232 h
= real_hash (CONST_DOUBLE_REAL_VALUE (value
));
236 /* Returns nonzero if the value represented by X (really a ...)
237 is the same as that represented by Y (really a ...) */
239 const_double_htab_eq (x
, y
)
243 rtx a
= (rtx
)x
, b
= (rtx
)y
;
245 if (GET_MODE (a
) != GET_MODE (b
))
247 if (GET_MODE (a
) == VOIDmode
)
248 return (CONST_DOUBLE_LOW (a
) == CONST_DOUBLE_LOW (b
)
249 && CONST_DOUBLE_HIGH (a
) == CONST_DOUBLE_HIGH (b
));
251 return real_identical (CONST_DOUBLE_REAL_VALUE (a
),
252 CONST_DOUBLE_REAL_VALUE (b
));
255 /* Returns a hash code for X (which is a really a mem_attrs *). */
258 mem_attrs_htab_hash (x
)
261 mem_attrs
*p
= (mem_attrs
*) x
;
263 return (p
->alias
^ (p
->align
* 1000)
264 ^ ((p
->offset
? INTVAL (p
->offset
) : 0) * 50000)
265 ^ ((p
->size
? INTVAL (p
->size
) : 0) * 2500000)
269 /* Returns nonzero if the value represented by X (which is really a
270 mem_attrs *) is the same as that given by Y (which is also really a
274 mem_attrs_htab_eq (x
, y
)
278 mem_attrs
*p
= (mem_attrs
*) x
;
279 mem_attrs
*q
= (mem_attrs
*) y
;
281 return (p
->alias
== q
->alias
&& p
->expr
== q
->expr
&& p
->offset
== q
->offset
282 && p
->size
== q
->size
&& p
->align
== q
->align
);
285 /* Allocate a new mem_attrs structure and insert it into the hash table if
286 one identical to it is not already in the table. We are doing this for
290 get_mem_attrs (alias
, expr
, offset
, size
, align
, mode
)
296 enum machine_mode mode
;
301 /* If everything is the default, we can just return zero. */
302 if (alias
== 0 && expr
== 0 && offset
== 0
304 || (mode
!= BLKmode
&& GET_MODE_SIZE (mode
) == INTVAL (size
)))
305 && (align
== BITS_PER_UNIT
307 && mode
!= BLKmode
&& align
== GET_MODE_ALIGNMENT (mode
))))
312 attrs
.offset
= offset
;
316 slot
= htab_find_slot (mem_attrs_htab
, &attrs
, INSERT
);
319 *slot
= ggc_alloc (sizeof (mem_attrs
));
320 memcpy (*slot
, &attrs
, sizeof (mem_attrs
));
326 /* Generate a new REG rtx. Make sure ORIGINAL_REGNO is set properly, and
327 don't attempt to share with the various global pieces of rtl (such as
328 frame_pointer_rtx). */
331 gen_raw_REG (mode
, regno
)
332 enum machine_mode mode
;
335 rtx x
= gen_rtx_raw_REG (mode
, regno
);
336 ORIGINAL_REGNO (x
) = regno
;
340 /* There are some RTL codes that require special attention; the generation
341 functions do the raw handling. If you add to this list, modify
342 special_rtx in gengenrtl.c as well. */
345 gen_rtx_CONST_INT (mode
, arg
)
346 enum machine_mode mode ATTRIBUTE_UNUSED
;
351 if (arg
>= - MAX_SAVED_CONST_INT
&& arg
<= MAX_SAVED_CONST_INT
)
352 return const_int_rtx
[arg
+ MAX_SAVED_CONST_INT
];
354 #if STORE_FLAG_VALUE != 1 && STORE_FLAG_VALUE != -1
355 if (const_true_rtx
&& arg
== STORE_FLAG_VALUE
)
356 return const_true_rtx
;
359 /* Look up the CONST_INT in the hash table. */
360 slot
= htab_find_slot_with_hash (const_int_htab
, &arg
,
361 (hashval_t
) arg
, INSERT
);
363 *slot
= gen_rtx_raw_CONST_INT (VOIDmode
, arg
);
369 gen_int_mode (c
, mode
)
371 enum machine_mode mode
;
373 return GEN_INT (trunc_int_for_mode (c
, mode
));
376 /* CONST_DOUBLEs might be created from pairs of integers, or from
377 REAL_VALUE_TYPEs. Also, their length is known only at run time,
378 so we cannot use gen_rtx_raw_CONST_DOUBLE. */
380 /* Determine whether REAL, a CONST_DOUBLE, already exists in the
381 hash table. If so, return its counterpart; otherwise add it
382 to the hash table and return it. */
384 lookup_const_double (real
)
387 void **slot
= htab_find_slot (const_double_htab
, real
, INSERT
);
394 /* Return a CONST_DOUBLE rtx for a floating-point value specified by
395 VALUE in mode MODE. */
397 const_double_from_real_value (value
, mode
)
398 REAL_VALUE_TYPE value
;
399 enum machine_mode mode
;
401 rtx real
= rtx_alloc (CONST_DOUBLE
);
402 PUT_MODE (real
, mode
);
404 memcpy (&CONST_DOUBLE_LOW (real
), &value
, sizeof (REAL_VALUE_TYPE
));
406 return lookup_const_double (real
);
409 /* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair
410 of ints: I0 is the low-order word and I1 is the high-order word.
411 Do not use this routine for non-integer modes; convert to
412 REAL_VALUE_TYPE and use CONST_DOUBLE_FROM_REAL_VALUE. */
415 immed_double_const (i0
, i1
, mode
)
416 HOST_WIDE_INT i0
, i1
;
417 enum machine_mode mode
;
422 if (mode
!= VOIDmode
)
425 if (GET_MODE_CLASS (mode
) != MODE_INT
426 && GET_MODE_CLASS (mode
) != MODE_PARTIAL_INT
427 /* We can get a 0 for an error mark. */
428 && GET_MODE_CLASS (mode
) != MODE_VECTOR_INT
429 && GET_MODE_CLASS (mode
) != MODE_VECTOR_FLOAT
)
432 /* We clear out all bits that don't belong in MODE, unless they and
433 our sign bit are all one. So we get either a reasonable negative
434 value or a reasonable unsigned value for this mode. */
435 width
= GET_MODE_BITSIZE (mode
);
436 if (width
< HOST_BITS_PER_WIDE_INT
437 && ((i0
& ((HOST_WIDE_INT
) (-1) << (width
- 1)))
438 != ((HOST_WIDE_INT
) (-1) << (width
- 1))))
439 i0
&= ((HOST_WIDE_INT
) 1 << width
) - 1, i1
= 0;
440 else if (width
== HOST_BITS_PER_WIDE_INT
441 && ! (i1
== ~0 && i0
< 0))
443 else if (width
> 2 * HOST_BITS_PER_WIDE_INT
)
444 /* We cannot represent this value as a constant. */
447 /* If this would be an entire word for the target, but is not for
448 the host, then sign-extend on the host so that the number will
449 look the same way on the host that it would on the target.
451 For example, when building a 64 bit alpha hosted 32 bit sparc
452 targeted compiler, then we want the 32 bit unsigned value -1 to be
453 represented as a 64 bit value -1, and not as 0x00000000ffffffff.
454 The latter confuses the sparc backend. */
456 if (width
< HOST_BITS_PER_WIDE_INT
457 && (i0
& ((HOST_WIDE_INT
) 1 << (width
- 1))))
458 i0
|= ((HOST_WIDE_INT
) (-1) << width
);
460 /* If MODE fits within HOST_BITS_PER_WIDE_INT, always use a
463 ??? Strictly speaking, this is wrong if we create a CONST_INT for
464 a large unsigned constant with the size of MODE being
465 HOST_BITS_PER_WIDE_INT and later try to interpret that constant
466 in a wider mode. In that case we will mis-interpret it as a
469 Unfortunately, the only alternative is to make a CONST_DOUBLE for
470 any constant in any mode if it is an unsigned constant larger
471 than the maximum signed integer in an int on the host. However,
472 doing this will break everyone that always expects to see a
473 CONST_INT for SImode and smaller.
475 We have always been making CONST_INTs in this case, so nothing
476 new is being broken. */
478 if (width
<= HOST_BITS_PER_WIDE_INT
)
479 i1
= (i0
< 0) ? ~(HOST_WIDE_INT
) 0 : 0;
482 /* If this integer fits in one word, return a CONST_INT. */
483 if ((i1
== 0 && i0
>= 0) || (i1
== ~0 && i0
< 0))
486 /* We use VOIDmode for integers. */
487 value
= rtx_alloc (CONST_DOUBLE
);
488 PUT_MODE (value
, VOIDmode
);
490 CONST_DOUBLE_LOW (value
) = i0
;
491 CONST_DOUBLE_HIGH (value
) = i1
;
493 for (i
= 2; i
< (sizeof CONST_DOUBLE_FORMAT
- 1); i
++)
494 XWINT (value
, i
) = 0;
496 return lookup_const_double (value
);
500 gen_rtx_REG (mode
, regno
)
501 enum machine_mode mode
;
504 /* In case the MD file explicitly references the frame pointer, have
505 all such references point to the same frame pointer. This is
506 used during frame pointer elimination to distinguish the explicit
507 references to these registers from pseudos that happened to be
510 If we have eliminated the frame pointer or arg pointer, we will
511 be using it as a normal register, for example as a spill
512 register. In such cases, we might be accessing it in a mode that
513 is not Pmode and therefore cannot use the pre-allocated rtx.
515 Also don't do this when we are making new REGs in reload, since
516 we don't want to get confused with the real pointers. */
518 if (mode
== Pmode
&& !reload_in_progress
)
520 if (regno
== FRAME_POINTER_REGNUM
521 && (!reload_completed
|| frame_pointer_needed
))
522 return frame_pointer_rtx
;
523 #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
524 if (regno
== HARD_FRAME_POINTER_REGNUM
525 && (!reload_completed
|| frame_pointer_needed
))
526 return hard_frame_pointer_rtx
;
528 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM && HARD_FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
529 if (regno
== ARG_POINTER_REGNUM
)
530 return arg_pointer_rtx
;
532 #ifdef RETURN_ADDRESS_POINTER_REGNUM
533 if (regno
== RETURN_ADDRESS_POINTER_REGNUM
)
534 return return_address_pointer_rtx
;
536 if (regno
== (unsigned) PIC_OFFSET_TABLE_REGNUM
537 && fixed_regs
[PIC_OFFSET_TABLE_REGNUM
])
538 return pic_offset_table_rtx
;
539 if (regno
== STACK_POINTER_REGNUM
)
540 return stack_pointer_rtx
;
544 /* If the per-function register table has been set up, try to re-use
545 an existing entry in that table to avoid useless generation of RTL.
547 This code is disabled for now until we can fix the various backends
548 which depend on having non-shared hard registers in some cases. Long
549 term we want to re-enable this code as it can significantly cut down
550 on the amount of useless RTL that gets generated.
552 We'll also need to fix some code that runs after reload that wants to
553 set ORIGINAL_REGNO. */
558 && regno
< FIRST_PSEUDO_REGISTER
559 && reg_raw_mode
[regno
] == mode
)
560 return regno_reg_rtx
[regno
];
563 return gen_raw_REG (mode
, regno
);
567 gen_rtx_MEM (mode
, addr
)
568 enum machine_mode mode
;
571 rtx rt
= gen_rtx_raw_MEM (mode
, addr
);
573 /* This field is not cleared by the mere allocation of the rtx, so
581 gen_rtx_SUBREG (mode
, reg
, offset
)
582 enum machine_mode mode
;
586 /* This is the most common failure type.
587 Catch it early so we can see who does it. */
588 if ((offset
% GET_MODE_SIZE (mode
)) != 0)
591 /* This check isn't usable right now because combine will
592 throw arbitrary crap like a CALL into a SUBREG in
593 gen_lowpart_for_combine so we must just eat it. */
595 /* Check for this too. */
596 if (offset
>= GET_MODE_SIZE (GET_MODE (reg
)))
599 return gen_rtx_raw_SUBREG (mode
, reg
, offset
);
602 /* Generate a SUBREG representing the least-significant part of REG if MODE
603 is smaller than mode of REG, otherwise paradoxical SUBREG. */
606 gen_lowpart_SUBREG (mode
, reg
)
607 enum machine_mode mode
;
610 enum machine_mode inmode
;
612 inmode
= GET_MODE (reg
);
613 if (inmode
== VOIDmode
)
615 return gen_rtx_SUBREG (mode
, reg
,
616 subreg_lowpart_offset (mode
, inmode
));
619 /* rtx gen_rtx (code, mode, [element1, ..., elementn])
621 ** This routine generates an RTX of the size specified by
622 ** <code>, which is an RTX code. The RTX structure is initialized
623 ** from the arguments <element1> through <elementn>, which are
624 ** interpreted according to the specific RTX type's format. The
625 ** special machine mode associated with the rtx (if any) is specified
628 ** gen_rtx can be invoked in a way which resembles the lisp-like
629 ** rtx it will generate. For example, the following rtx structure:
631 ** (plus:QI (mem:QI (reg:SI 1))
632 ** (mem:QI (plusw:SI (reg:SI 2) (reg:SI 3))))
634 ** ...would be generated by the following C code:
636 ** gen_rtx (PLUS, QImode,
637 ** gen_rtx (MEM, QImode,
638 ** gen_rtx (REG, SImode, 1)),
639 ** gen_rtx (MEM, QImode,
640 ** gen_rtx (PLUS, SImode,
641 ** gen_rtx (REG, SImode, 2),
642 ** gen_rtx (REG, SImode, 3)))),
647 gen_rtx
VPARAMS ((enum rtx_code code
, enum machine_mode mode
, ...))
649 int i
; /* Array indices... */
650 const char *fmt
; /* Current rtx's format... */
651 rtx rt_val
; /* RTX to return to caller... */
654 VA_FIXEDARG (p
, enum rtx_code
, code
);
655 VA_FIXEDARG (p
, enum machine_mode
, mode
);
660 rt_val
= gen_rtx_CONST_INT (mode
, va_arg (p
, HOST_WIDE_INT
));
665 HOST_WIDE_INT arg0
= va_arg (p
, HOST_WIDE_INT
);
666 HOST_WIDE_INT arg1
= va_arg (p
, HOST_WIDE_INT
);
668 rt_val
= immed_double_const (arg0
, arg1
, mode
);
673 rt_val
= gen_rtx_REG (mode
, va_arg (p
, int));
677 rt_val
= gen_rtx_MEM (mode
, va_arg (p
, rtx
));
681 rt_val
= rtx_alloc (code
); /* Allocate the storage space. */
682 rt_val
->mode
= mode
; /* Store the machine mode... */
684 fmt
= GET_RTX_FORMAT (code
); /* Find the right format... */
685 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++)
689 case '0': /* Unused field. */
692 case 'i': /* An integer? */
693 XINT (rt_val
, i
) = va_arg (p
, int);
696 case 'w': /* A wide integer? */
697 XWINT (rt_val
, i
) = va_arg (p
, HOST_WIDE_INT
);
700 case 's': /* A string? */
701 XSTR (rt_val
, i
) = va_arg (p
, char *);
704 case 'e': /* An expression? */
705 case 'u': /* An insn? Same except when printing. */
706 XEXP (rt_val
, i
) = va_arg (p
, rtx
);
709 case 'E': /* An RTX vector? */
710 XVEC (rt_val
, i
) = va_arg (p
, rtvec
);
713 case 'b': /* A bitmap? */
714 XBITMAP (rt_val
, i
) = va_arg (p
, bitmap
);
717 case 't': /* A tree? */
718 XTREE (rt_val
, i
) = va_arg (p
, tree
);
732 /* gen_rtvec (n, [rt1, ..., rtn])
734 ** This routine creates an rtvec and stores within it the
735 ** pointers to rtx's which are its arguments.
740 gen_rtvec
VPARAMS ((int n
, ...))
746 VA_FIXEDARG (p
, int, n
);
749 return NULL_RTVEC
; /* Don't allocate an empty rtvec... */
751 vector
= (rtx
*) alloca (n
* sizeof (rtx
));
753 for (i
= 0; i
< n
; i
++)
754 vector
[i
] = va_arg (p
, rtx
);
756 /* The definition of VA_* in K&R C causes `n' to go out of scope. */
760 return gen_rtvec_v (save_n
, vector
);
764 gen_rtvec_v (n
, argp
)
772 return NULL_RTVEC
; /* Don't allocate an empty rtvec... */
774 rt_val
= rtvec_alloc (n
); /* Allocate an rtvec... */
776 for (i
= 0; i
< n
; i
++)
777 rt_val
->elem
[i
] = *argp
++;
782 /* Generate a REG rtx for a new pseudo register of mode MODE.
783 This pseudo is assigned the next sequential register number. */
787 enum machine_mode mode
;
789 struct function
*f
= cfun
;
792 /* Don't let anything called after initial flow analysis create new
797 if (generating_concat_p
798 && (GET_MODE_CLASS (mode
) == MODE_COMPLEX_FLOAT
799 || GET_MODE_CLASS (mode
) == MODE_COMPLEX_INT
))
801 /* For complex modes, don't make a single pseudo.
802 Instead, make a CONCAT of two pseudos.
803 This allows noncontiguous allocation of the real and imaginary parts,
804 which makes much better code. Besides, allocating DCmode
805 pseudos overstrains reload on some machines like the 386. */
806 rtx realpart
, imagpart
;
807 enum machine_mode partmode
= GET_MODE_INNER (mode
);
809 realpart
= gen_reg_rtx (partmode
);
810 imagpart
= gen_reg_rtx (partmode
);
811 return gen_rtx_CONCAT (mode
, realpart
, imagpart
);
814 /* Make sure regno_pointer_align, regno_decl, and regno_reg_rtx are large
815 enough to have an element for this pseudo reg number. */
817 if (reg_rtx_no
== f
->emit
->regno_pointer_align_length
)
819 int old_size
= f
->emit
->regno_pointer_align_length
;
824 new = ggc_realloc (f
->emit
->regno_pointer_align
, old_size
* 2);
825 memset (new + old_size
, 0, old_size
);
826 f
->emit
->regno_pointer_align
= (unsigned char *) new;
828 new1
= (rtx
*) ggc_realloc (f
->emit
->x_regno_reg_rtx
,
829 old_size
* 2 * sizeof (rtx
));
830 memset (new1
+ old_size
, 0, old_size
* sizeof (rtx
));
831 regno_reg_rtx
= new1
;
833 new2
= (tree
*) ggc_realloc (f
->emit
->regno_decl
,
834 old_size
* 2 * sizeof (tree
));
835 memset (new2
+ old_size
, 0, old_size
* sizeof (tree
));
836 f
->emit
->regno_decl
= new2
;
838 f
->emit
->regno_pointer_align_length
= old_size
* 2;
841 val
= gen_raw_REG (mode
, reg_rtx_no
);
842 regno_reg_rtx
[reg_rtx_no
++] = val
;
846 /* Identify REG (which may be a CONCAT) as a user register. */
852 if (GET_CODE (reg
) == CONCAT
)
854 REG_USERVAR_P (XEXP (reg
, 0)) = 1;
855 REG_USERVAR_P (XEXP (reg
, 1)) = 1;
857 else if (GET_CODE (reg
) == REG
)
858 REG_USERVAR_P (reg
) = 1;
863 /* Identify REG as a probable pointer register and show its alignment
864 as ALIGN, if nonzero. */
867 mark_reg_pointer (reg
, align
)
871 if (! REG_POINTER (reg
))
873 REG_POINTER (reg
) = 1;
876 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
878 else if (align
&& align
< REGNO_POINTER_ALIGN (REGNO (reg
)))
879 /* We can no-longer be sure just how aligned this pointer is */
880 REGNO_POINTER_ALIGN (REGNO (reg
)) = align
;
883 /* Return 1 plus largest pseudo reg number used in the current function. */
891 /* Return 1 + the largest label number used so far in the current function. */
896 if (last_label_num
&& label_num
== base_label_num
)
897 return last_label_num
;
901 /* Return first label number used in this function (if any were used). */
904 get_first_label_num ()
906 return first_label_num
;
909 /* Return the final regno of X, which is a SUBREG of a hard
912 subreg_hard_regno (x
, check_mode
)
916 enum machine_mode mode
= GET_MODE (x
);
917 unsigned int byte_offset
, base_regno
, final_regno
;
918 rtx reg
= SUBREG_REG (x
);
920 /* This is where we attempt to catch illegal subregs
921 created by the compiler. */
922 if (GET_CODE (x
) != SUBREG
923 || GET_CODE (reg
) != REG
)
925 base_regno
= REGNO (reg
);
926 if (base_regno
>= FIRST_PSEUDO_REGISTER
)
928 if (check_mode
&& ! HARD_REGNO_MODE_OK (base_regno
, GET_MODE (reg
)))
931 /* Catch non-congruent offsets too. */
932 byte_offset
= SUBREG_BYTE (x
);
933 if ((byte_offset
% GET_MODE_SIZE (mode
)) != 0)
936 final_regno
= subreg_regno (x
);
941 /* Return a value representing some low-order bits of X, where the number
942 of low-order bits is given by MODE. Note that no conversion is done
943 between floating-point and fixed-point values, rather, the bit
944 representation is returned.
946 This function handles the cases in common between gen_lowpart, below,
947 and two variants in cse.c and combine.c. These are the cases that can
948 be safely handled at all points in the compilation.
950 If this is not a case we can handle, return 0. */
953 gen_lowpart_common (mode
, x
)
954 enum machine_mode mode
;
957 int msize
= GET_MODE_SIZE (mode
);
958 int xsize
= GET_MODE_SIZE (GET_MODE (x
));
961 if (GET_MODE (x
) == mode
)
964 /* MODE must occupy no more words than the mode of X. */
965 if (GET_MODE (x
) != VOIDmode
966 && ((msize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
967 > ((xsize
+ (UNITS_PER_WORD
- 1)) / UNITS_PER_WORD
)))
970 /* Don't allow generating paradoxical FLOAT_MODE subregs. */
971 if (GET_MODE_CLASS (mode
) == MODE_FLOAT
972 && GET_MODE (x
) != VOIDmode
&& msize
> xsize
)
975 offset
= subreg_lowpart_offset (mode
, GET_MODE (x
));
977 if ((GET_CODE (x
) == ZERO_EXTEND
|| GET_CODE (x
) == SIGN_EXTEND
)
978 && (GET_MODE_CLASS (mode
) == MODE_INT
979 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
))
981 /* If we are getting the low-order part of something that has been
982 sign- or zero-extended, we can either just use the object being
983 extended or make a narrower extension. If we want an even smaller
984 piece than the size of the object being extended, call ourselves
987 This case is used mostly by combine and cse. */
989 if (GET_MODE (XEXP (x
, 0)) == mode
)
991 else if (GET_MODE_SIZE (mode
) < GET_MODE_SIZE (GET_MODE (XEXP (x
, 0))))
992 return gen_lowpart_common (mode
, XEXP (x
, 0));
993 else if (GET_MODE_SIZE (mode
) < GET_MODE_SIZE (GET_MODE (x
)))
994 return gen_rtx_fmt_e (GET_CODE (x
), mode
, XEXP (x
, 0));
996 else if (GET_CODE (x
) == SUBREG
|| GET_CODE (x
) == REG
997 || GET_CODE (x
) == CONCAT
|| GET_CODE (x
) == CONST_VECTOR
)
998 return simplify_gen_subreg (mode
, x
, GET_MODE (x
), offset
);
999 else if ((GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
1000 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
)
1001 && GET_MODE (x
) == VOIDmode
)
1002 return simplify_gen_subreg (mode
, x
, int_mode_for_mode (mode
), offset
);
1003 /* If X is a CONST_INT or a CONST_DOUBLE, extract the appropriate bits
1004 from the low-order part of the constant. */
1005 else if ((GET_MODE_CLASS (mode
) == MODE_INT
1006 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
)
1007 && GET_MODE (x
) == VOIDmode
1008 && (GET_CODE (x
) == CONST_INT
|| GET_CODE (x
) == CONST_DOUBLE
))
1010 /* If MODE is twice the host word size, X is already the desired
1011 representation. Otherwise, if MODE is wider than a word, we can't
1012 do this. If MODE is exactly a word, return just one CONST_INT. */
1014 if (GET_MODE_BITSIZE (mode
) >= 2 * HOST_BITS_PER_WIDE_INT
)
1016 else if (GET_MODE_BITSIZE (mode
) > HOST_BITS_PER_WIDE_INT
)
1018 else if (GET_MODE_BITSIZE (mode
) == HOST_BITS_PER_WIDE_INT
)
1019 return (GET_CODE (x
) == CONST_INT
? x
1020 : GEN_INT (CONST_DOUBLE_LOW (x
)));
1023 /* MODE must be narrower than HOST_BITS_PER_WIDE_INT. */
1024 HOST_WIDE_INT val
= (GET_CODE (x
) == CONST_INT
? INTVAL (x
)
1025 : CONST_DOUBLE_LOW (x
));
1027 /* Sign extend to HOST_WIDE_INT. */
1028 val
= trunc_int_for_mode (val
, mode
);
1030 return (GET_CODE (x
) == CONST_INT
&& INTVAL (x
) == val
? x
1035 /* The floating-point emulator can handle all conversions between
1036 FP and integer operands. This simplifies reload because it
1037 doesn't have to deal with constructs like (subreg:DI
1038 (const_double:SF ...)) or (subreg:DF (const_int ...)). */
1039 /* Single-precision floats are always 32-bits and double-precision
1040 floats are always 64-bits. */
1042 else if (GET_MODE_CLASS (mode
) == MODE_FLOAT
1043 && GET_MODE_BITSIZE (mode
) == 32
1044 && GET_CODE (x
) == CONST_INT
)
1047 long i
= INTVAL (x
);
1049 real_from_target (&r
, &i
, mode
);
1050 return CONST_DOUBLE_FROM_REAL_VALUE (r
, mode
);
1052 else if (GET_MODE_CLASS (mode
) == MODE_FLOAT
1053 && GET_MODE_BITSIZE (mode
) == 64
1054 && (GET_CODE (x
) == CONST_INT
|| GET_CODE (x
) == CONST_DOUBLE
)
1055 && GET_MODE (x
) == VOIDmode
)
1058 HOST_WIDE_INT low
, high
;
1061 if (GET_CODE (x
) == CONST_INT
)
1064 high
= low
>> (HOST_BITS_PER_WIDE_INT
- 1);
1068 low
= CONST_DOUBLE_LOW (x
);
1069 high
= CONST_DOUBLE_HIGH (x
);
1072 if (HOST_BITS_PER_WIDE_INT
> 32)
1073 high
= low
>> 31 >> 1;
1075 /* REAL_VALUE_TARGET_DOUBLE takes the addressing order of the
1077 if (WORDS_BIG_ENDIAN
)
1078 i
[0] = high
, i
[1] = low
;
1080 i
[0] = low
, i
[1] = high
;
1082 real_from_target (&r
, i
, mode
);
1083 return CONST_DOUBLE_FROM_REAL_VALUE (r
, mode
);
1085 else if ((GET_MODE_CLASS (mode
) == MODE_INT
1086 || GET_MODE_CLASS (mode
) == MODE_PARTIAL_INT
)
1087 && GET_CODE (x
) == CONST_DOUBLE
1088 && GET_MODE_CLASS (GET_MODE (x
)) == MODE_FLOAT
)
1091 long i
[4]; /* Only the low 32 bits of each 'long' are used. */
1092 int endian
= WORDS_BIG_ENDIAN
? 1 : 0;
1094 /* Convert 'r' into an array of four 32-bit words in target word
1096 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1097 switch (GET_MODE_BITSIZE (GET_MODE (x
)))
1100 REAL_VALUE_TO_TARGET_SINGLE (r
, i
[3 * endian
]);
1103 i
[3 - 3 * endian
] = 0;
1106 REAL_VALUE_TO_TARGET_DOUBLE (r
, i
+ 2 * endian
);
1107 i
[2 - 2 * endian
] = 0;
1108 i
[3 - 2 * endian
] = 0;
1111 REAL_VALUE_TO_TARGET_LONG_DOUBLE (r
, i
+ endian
);
1112 i
[3 - 3 * endian
] = 0;
1115 REAL_VALUE_TO_TARGET_LONG_DOUBLE (r
, i
);
1120 /* Now, pack the 32-bit elements of the array into a CONST_DOUBLE
1122 #if HOST_BITS_PER_WIDE_INT == 32
1123 return immed_double_const (i
[3 * endian
], i
[1 + endian
], mode
);
1125 if (HOST_BITS_PER_WIDE_INT
!= 64)
1128 return immed_double_const ((((unsigned long) i
[3 * endian
])
1129 | ((HOST_WIDE_INT
) i
[1 + endian
] << 32)),
1130 (((unsigned long) i
[2 - endian
])
1131 | ((HOST_WIDE_INT
) i
[3 - 3 * endian
] << 32)),
1136 /* Otherwise, we can't do this. */
1140 /* Return the real part (which has mode MODE) of a complex value X.
1141 This always comes at the low address in memory. */
1144 gen_realpart (mode
, x
)
1145 enum machine_mode mode
;
1148 if (WORDS_BIG_ENDIAN
1149 && GET_MODE_BITSIZE (mode
) < BITS_PER_WORD
1151 && REGNO (x
) < FIRST_PSEUDO_REGISTER
)
1153 ("can't access real part of complex value in hard register");
1154 else if (WORDS_BIG_ENDIAN
)
1155 return gen_highpart (mode
, x
);
1157 return gen_lowpart (mode
, x
);
1160 /* Return the imaginary part (which has mode MODE) of a complex value X.
1161 This always comes at the high address in memory. */
1164 gen_imagpart (mode
, x
)
1165 enum machine_mode mode
;
1168 if (WORDS_BIG_ENDIAN
)
1169 return gen_lowpart (mode
, x
);
1170 else if (! WORDS_BIG_ENDIAN
1171 && GET_MODE_BITSIZE (mode
) < BITS_PER_WORD
1173 && REGNO (x
) < FIRST_PSEUDO_REGISTER
)
1175 ("can't access imaginary part of complex value in hard register");
1177 return gen_highpart (mode
, x
);
1180 /* Return 1 iff X, assumed to be a SUBREG,
1181 refers to the real part of the complex value in its containing reg.
1182 Complex values are always stored with the real part in the first word,
1183 regardless of WORDS_BIG_ENDIAN. */
1186 subreg_realpart_p (x
)
1189 if (GET_CODE (x
) != SUBREG
)
1192 return ((unsigned int) SUBREG_BYTE (x
)
1193 < GET_MODE_UNIT_SIZE (GET_MODE (SUBREG_REG (x
))));
1196 /* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a value,
1197 return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
1198 least-significant part of X.
1199 MODE specifies how big a part of X to return;
1200 it usually should not be larger than a word.
1201 If X is a MEM whose address is a QUEUED, the value may be so also. */
1204 gen_lowpart (mode
, x
)
1205 enum machine_mode mode
;
1208 rtx result
= gen_lowpart_common (mode
, x
);
1212 else if (GET_CODE (x
) == REG
)
1214 /* Must be a hard reg that's not valid in MODE. */
1215 result
= gen_lowpart_common (mode
, copy_to_reg (x
));
1220 else if (GET_CODE (x
) == MEM
)
1222 /* The only additional case we can do is MEM. */
1224 if (WORDS_BIG_ENDIAN
)
1225 offset
= (MAX (GET_MODE_SIZE (GET_MODE (x
)), UNITS_PER_WORD
)
1226 - MAX (GET_MODE_SIZE (mode
), UNITS_PER_WORD
));
1228 if (BYTES_BIG_ENDIAN
)
1229 /* Adjust the address so that the address-after-the-data
1231 offset
-= (MIN (UNITS_PER_WORD
, GET_MODE_SIZE (mode
))
1232 - MIN (UNITS_PER_WORD
, GET_MODE_SIZE (GET_MODE (x
))));
1234 return adjust_address (x
, mode
, offset
);
1236 else if (GET_CODE (x
) == ADDRESSOF
)
1237 return gen_lowpart (mode
, force_reg (GET_MODE (x
), x
));
1242 /* Like `gen_lowpart', but refer to the most significant part.
1243 This is used to access the imaginary part of a complex number. */
1246 gen_highpart (mode
, x
)
1247 enum machine_mode mode
;
1250 unsigned int msize
= GET_MODE_SIZE (mode
);
1253 /* This case loses if X is a subreg. To catch bugs early,
1254 complain if an invalid MODE is used even in other cases. */
1255 if (msize
> UNITS_PER_WORD
1256 && msize
!= GET_MODE_UNIT_SIZE (GET_MODE (x
)))
1259 result
= simplify_gen_subreg (mode
, x
, GET_MODE (x
),
1260 subreg_highpart_offset (mode
, GET_MODE (x
)));
1262 /* simplify_gen_subreg is not guaranteed to return a valid operand for
1263 the target if we have a MEM. gen_highpart must return a valid operand,
1264 emitting code if necessary to do so. */
1265 if (result
!= NULL_RTX
&& GET_CODE (result
) == MEM
)
1266 result
= validize_mem (result
);
1273 /* Like gen_highpart_mode, but accept mode of EXP operand in case EXP can
1274 be VOIDmode constant. */
1276 gen_highpart_mode (outermode
, innermode
, exp
)
1277 enum machine_mode outermode
, innermode
;
1280 if (GET_MODE (exp
) != VOIDmode
)
1282 if (GET_MODE (exp
) != innermode
)
1284 return gen_highpart (outermode
, exp
);
1286 return simplify_gen_subreg (outermode
, exp
, innermode
,
1287 subreg_highpart_offset (outermode
, innermode
));
1290 /* Return offset in bytes to get OUTERMODE low part
1291 of the value in mode INNERMODE stored in memory in target format. */
1294 subreg_lowpart_offset (outermode
, innermode
)
1295 enum machine_mode outermode
, innermode
;
1297 unsigned int offset
= 0;
1298 int difference
= (GET_MODE_SIZE (innermode
) - GET_MODE_SIZE (outermode
));
1302 if (WORDS_BIG_ENDIAN
)
1303 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
1304 if (BYTES_BIG_ENDIAN
)
1305 offset
+= difference
% UNITS_PER_WORD
;
1311 /* Return offset in bytes to get OUTERMODE high part
1312 of the value in mode INNERMODE stored in memory in target format. */
1314 subreg_highpart_offset (outermode
, innermode
)
1315 enum machine_mode outermode
, innermode
;
1317 unsigned int offset
= 0;
1318 int difference
= (GET_MODE_SIZE (innermode
) - GET_MODE_SIZE (outermode
));
1320 if (GET_MODE_SIZE (innermode
) < GET_MODE_SIZE (outermode
))
1325 if (! WORDS_BIG_ENDIAN
)
1326 offset
+= (difference
/ UNITS_PER_WORD
) * UNITS_PER_WORD
;
1327 if (! BYTES_BIG_ENDIAN
)
1328 offset
+= difference
% UNITS_PER_WORD
;
1334 /* Return 1 iff X, assumed to be a SUBREG,
1335 refers to the least significant part of its containing reg.
1336 If X is not a SUBREG, always return 1 (it is its own low part!). */
1339 subreg_lowpart_p (x
)
1342 if (GET_CODE (x
) != SUBREG
)
1344 else if (GET_MODE (SUBREG_REG (x
)) == VOIDmode
)
1347 return (subreg_lowpart_offset (GET_MODE (x
), GET_MODE (SUBREG_REG (x
)))
1348 == SUBREG_BYTE (x
));
1352 /* Helper routine for all the constant cases of operand_subword.
1353 Some places invoke this directly. */
1356 constant_subword (op
, offset
, mode
)
1359 enum machine_mode mode
;
1361 int size_ratio
= HOST_BITS_PER_WIDE_INT
/ BITS_PER_WORD
;
1364 /* If OP is already an integer word, return it. */
1365 if (GET_MODE_CLASS (mode
) == MODE_INT
1366 && GET_MODE_SIZE (mode
) == UNITS_PER_WORD
)
1369 /* The output is some bits, the width of the target machine's word.
1370 A wider-word host can surely hold them in a CONST_INT. A narrower-word
1372 if (HOST_BITS_PER_WIDE_INT
>= BITS_PER_WORD
1373 && GET_MODE_CLASS (mode
) == MODE_FLOAT
1374 && GET_MODE_BITSIZE (mode
) == 64
1375 && GET_CODE (op
) == CONST_DOUBLE
)
1380 REAL_VALUE_FROM_CONST_DOUBLE (rv
, op
);
1381 REAL_VALUE_TO_TARGET_DOUBLE (rv
, k
);
1383 /* We handle 32-bit and >= 64-bit words here. Note that the order in
1384 which the words are written depends on the word endianness.
1385 ??? This is a potential portability problem and should
1386 be fixed at some point.
1388 We must exercise caution with the sign bit. By definition there
1389 are 32 significant bits in K; there may be more in a HOST_WIDE_INT.
1390 Consider a host with a 32-bit long and a 64-bit HOST_WIDE_INT.
1391 So we explicitly mask and sign-extend as necessary. */
1392 if (BITS_PER_WORD
== 32)
1395 val
= ((val
& 0xffffffff) ^ 0x80000000) - 0x80000000;
1396 return GEN_INT (val
);
1398 #if HOST_BITS_PER_WIDE_INT >= 64
1399 else if (BITS_PER_WORD
>= 64 && offset
== 0)
1401 val
= k
[! WORDS_BIG_ENDIAN
];
1402 val
= (((val
& 0xffffffff) ^ 0x80000000) - 0x80000000) << 32;
1403 val
|= (HOST_WIDE_INT
) k
[WORDS_BIG_ENDIAN
] & 0xffffffff;
1404 return GEN_INT (val
);
1407 else if (BITS_PER_WORD
== 16)
1409 val
= k
[offset
>> 1];
1410 if ((offset
& 1) == ! WORDS_BIG_ENDIAN
)
1412 val
= ((val
& 0xffff) ^ 0x8000) - 0x8000;
1413 return GEN_INT (val
);
1418 else if (HOST_BITS_PER_WIDE_INT
>= BITS_PER_WORD
1419 && GET_MODE_CLASS (mode
) == MODE_FLOAT
1420 && GET_MODE_BITSIZE (mode
) > 64
1421 && GET_CODE (op
) == CONST_DOUBLE
)
1426 REAL_VALUE_FROM_CONST_DOUBLE (rv
, op
);
1427 REAL_VALUE_TO_TARGET_LONG_DOUBLE (rv
, k
);
1429 if (BITS_PER_WORD
== 32)
1432 val
= ((val
& 0xffffffff) ^ 0x80000000) - 0x80000000;
1433 return GEN_INT (val
);
1435 #if HOST_BITS_PER_WIDE_INT >= 64
1436 else if (BITS_PER_WORD
>= 64 && offset
<= 1)
1438 val
= k
[offset
* 2 + ! WORDS_BIG_ENDIAN
];
1439 val
= (((val
& 0xffffffff) ^ 0x80000000) - 0x80000000) << 32;
1440 val
|= (HOST_WIDE_INT
) k
[offset
* 2 + WORDS_BIG_ENDIAN
] & 0xffffffff;
1441 return GEN_INT (val
);
1448 /* Single word float is a little harder, since single- and double-word
1449 values often do not have the same high-order bits. We have already
1450 verified that we want the only defined word of the single-word value. */
1451 if (GET_MODE_CLASS (mode
) == MODE_FLOAT
1452 && GET_MODE_BITSIZE (mode
) == 32
1453 && GET_CODE (op
) == CONST_DOUBLE
)
1458 REAL_VALUE_FROM_CONST_DOUBLE (rv
, op
);
1459 REAL_VALUE_TO_TARGET_SINGLE (rv
, l
);
1461 /* Sign extend from known 32-bit value to HOST_WIDE_INT. */
1463 val
= ((val
& 0xffffffff) ^ 0x80000000) - 0x80000000;
1465 if (BITS_PER_WORD
== 16)
1467 if ((offset
& 1) == ! WORDS_BIG_ENDIAN
)
1469 val
= ((val
& 0xffff) ^ 0x8000) - 0x8000;
1472 return GEN_INT (val
);
1475 /* The only remaining cases that we can handle are integers.
1476 Convert to proper endianness now since these cases need it.
1477 At this point, offset == 0 means the low-order word.
1479 We do not want to handle the case when BITS_PER_WORD <= HOST_BITS_PER_INT
1480 in general. However, if OP is (const_int 0), we can just return
1483 if (op
== const0_rtx
)
1486 if (GET_MODE_CLASS (mode
) != MODE_INT
1487 || (GET_CODE (op
) != CONST_INT
&& GET_CODE (op
) != CONST_DOUBLE
)
1488 || BITS_PER_WORD
> HOST_BITS_PER_WIDE_INT
)
1491 if (WORDS_BIG_ENDIAN
)
1492 offset
= GET_MODE_SIZE (mode
) / UNITS_PER_WORD
- 1 - offset
;
1494 /* Find out which word on the host machine this value is in and get
1495 it from the constant. */
1496 val
= (offset
/ size_ratio
== 0
1497 ? (GET_CODE (op
) == CONST_INT
? INTVAL (op
) : CONST_DOUBLE_LOW (op
))
1498 : (GET_CODE (op
) == CONST_INT
1499 ? (INTVAL (op
) < 0 ? ~0 : 0) : CONST_DOUBLE_HIGH (op
)));
1501 /* Get the value we want into the low bits of val. */
1502 if (BITS_PER_WORD
< HOST_BITS_PER_WIDE_INT
)
1503 val
= ((val
>> ((offset
% size_ratio
) * BITS_PER_WORD
)));
1505 val
= trunc_int_for_mode (val
, word_mode
);
1507 return GEN_INT (val
);
1510 /* Return subword OFFSET of operand OP.
1511 The word number, OFFSET, is interpreted as the word number starting
1512 at the low-order address. OFFSET 0 is the low-order word if not
1513 WORDS_BIG_ENDIAN, otherwise it is the high-order word.
1515 If we cannot extract the required word, we return zero. Otherwise,
1516 an rtx corresponding to the requested word will be returned.
1518 VALIDATE_ADDRESS is nonzero if the address should be validated. Before
1519 reload has completed, a valid address will always be returned. After
1520 reload, if a valid address cannot be returned, we return zero.
1522 If VALIDATE_ADDRESS is zero, we simply form the required address; validating
1523 it is the responsibility of the caller.
1525 MODE is the mode of OP in case it is a CONST_INT.
1527 ??? This is still rather broken for some cases. The problem for the
1528 moment is that all callers of this thing provide no 'goal mode' to
1529 tell us to work with. This exists because all callers were written
1530 in a word based SUBREG world.
1531 Now use of this function can be deprecated by simplify_subreg in most
1536 operand_subword (op
, offset
, validate_address
, mode
)
1538 unsigned int offset
;
1539 int validate_address
;
1540 enum machine_mode mode
;
1542 if (mode
== VOIDmode
)
1543 mode
= GET_MODE (op
);
1545 if (mode
== VOIDmode
)
1548 /* If OP is narrower than a word, fail. */
1550 && (GET_MODE_SIZE (mode
) < UNITS_PER_WORD
))
1553 /* If we want a word outside OP, return zero. */
1555 && (offset
+ 1) * UNITS_PER_WORD
> GET_MODE_SIZE (mode
))
1558 /* Form a new MEM at the requested address. */
1559 if (GET_CODE (op
) == MEM
)
1561 rtx
new = adjust_address_nv (op
, word_mode
, offset
* UNITS_PER_WORD
);
1563 if (! validate_address
)
1566 else if (reload_completed
)
1568 if (! strict_memory_address_p (word_mode
, XEXP (new, 0)))
1572 return replace_equiv_address (new, XEXP (new, 0));
1575 /* Rest can be handled by simplify_subreg. */
1576 return simplify_gen_subreg (word_mode
, op
, mode
, (offset
* UNITS_PER_WORD
));
1579 /* Similar to `operand_subword', but never return 0. If we can't extract
1580 the required subword, put OP into a register and try again. If that fails,
1581 abort. We always validate the address in this case.
1583 MODE is the mode of OP, in case it is CONST_INT. */
1586 operand_subword_force (op
, offset
, mode
)
1588 unsigned int offset
;
1589 enum machine_mode mode
;
1591 rtx result
= operand_subword (op
, offset
, 1, mode
);
1596 if (mode
!= BLKmode
&& mode
!= VOIDmode
)
1598 /* If this is a register which can not be accessed by words, copy it
1599 to a pseudo register. */
1600 if (GET_CODE (op
) == REG
)
1601 op
= copy_to_reg (op
);
1603 op
= force_reg (mode
, op
);
1606 result
= operand_subword (op
, offset
, 1, mode
);
1613 /* Given a compare instruction, swap the operands.
1614 A test instruction is changed into a compare of 0 against the operand. */
1617 reverse_comparison (insn
)
1620 rtx body
= PATTERN (insn
);
1623 if (GET_CODE (body
) == SET
)
1624 comp
= SET_SRC (body
);
1626 comp
= SET_SRC (XVECEXP (body
, 0, 0));
1628 if (GET_CODE (comp
) == COMPARE
)
1630 rtx op0
= XEXP (comp
, 0);
1631 rtx op1
= XEXP (comp
, 1);
1632 XEXP (comp
, 0) = op1
;
1633 XEXP (comp
, 1) = op0
;
1637 rtx
new = gen_rtx_COMPARE (VOIDmode
,
1638 CONST0_RTX (GET_MODE (comp
)), comp
);
1639 if (GET_CODE (body
) == SET
)
1640 SET_SRC (body
) = new;
1642 SET_SRC (XVECEXP (body
, 0, 0)) = new;
1646 /* Within a MEM_EXPR, we care about either (1) a component ref of a decl,
1647 or (2) a component ref of something variable. Represent the later with
1648 a NULL expression. */
1651 component_ref_for_mem_expr (ref
)
1654 tree inner
= TREE_OPERAND (ref
, 0);
1656 if (TREE_CODE (inner
) == COMPONENT_REF
)
1657 inner
= component_ref_for_mem_expr (inner
);
1660 tree placeholder_ptr
= 0;
1662 /* Now remove any conversions: they don't change what the underlying
1663 object is. Likewise for SAVE_EXPR. Also handle PLACEHOLDER_EXPR. */
1664 while (TREE_CODE (inner
) == NOP_EXPR
|| TREE_CODE (inner
) == CONVERT_EXPR
1665 || TREE_CODE (inner
) == NON_LVALUE_EXPR
1666 || TREE_CODE (inner
) == VIEW_CONVERT_EXPR
1667 || TREE_CODE (inner
) == SAVE_EXPR
1668 || TREE_CODE (inner
) == PLACEHOLDER_EXPR
)
1669 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
)
1670 inner
= find_placeholder (inner
, &placeholder_ptr
);
1672 inner
= TREE_OPERAND (inner
, 0);
1674 if (! DECL_P (inner
))
1678 if (inner
== TREE_OPERAND (ref
, 0))
1681 return build (COMPONENT_REF
, TREE_TYPE (ref
), inner
,
1682 TREE_OPERAND (ref
, 1));
1685 /* Given REF, a MEM, and T, either the type of X or the expression
1686 corresponding to REF, set the memory attributes. OBJECTP is nonzero
1687 if we are making a new object of this type. BITPOS is nonzero if
1688 there is an offset outstanding on T that will be applied later. */
1691 set_mem_attributes_minus_bitpos (ref
, t
, objectp
, bitpos
)
1695 HOST_WIDE_INT bitpos
;
1697 HOST_WIDE_INT alias
= MEM_ALIAS_SET (ref
);
1698 tree expr
= MEM_EXPR (ref
);
1699 rtx offset
= MEM_OFFSET (ref
);
1700 rtx size
= MEM_SIZE (ref
);
1701 unsigned int align
= MEM_ALIGN (ref
);
1702 HOST_WIDE_INT apply_bitpos
= 0;
1705 /* It can happen that type_for_mode was given a mode for which there
1706 is no language-level type. In which case it returns NULL, which
1711 type
= TYPE_P (t
) ? t
: TREE_TYPE (t
);
1713 /* If we have already set DECL_RTL = ref, get_alias_set will get the
1714 wrong answer, as it assumes that DECL_RTL already has the right alias
1715 info. Callers should not set DECL_RTL until after the call to
1716 set_mem_attributes. */
1717 if (DECL_P (t
) && ref
== DECL_RTL_IF_SET (t
))
1720 /* Get the alias set from the expression or type (perhaps using a
1721 front-end routine) and use it. */
1722 alias
= get_alias_set (t
);
1724 MEM_VOLATILE_P (ref
) = TYPE_VOLATILE (type
);
1725 MEM_IN_STRUCT_P (ref
) = AGGREGATE_TYPE_P (type
);
1726 RTX_UNCHANGING_P (ref
)
1727 |= ((lang_hooks
.honor_readonly
1728 && (TYPE_READONLY (type
) || TREE_READONLY (t
)))
1729 || (! TYPE_P (t
) && TREE_CONSTANT (t
)));
1731 /* If we are making an object of this type, or if this is a DECL, we know
1732 that it is a scalar if the type is not an aggregate. */
1733 if ((objectp
|| DECL_P (t
)) && ! AGGREGATE_TYPE_P (type
))
1734 MEM_SCALAR_P (ref
) = 1;
1736 /* We can set the alignment from the type if we are making an object,
1737 this is an INDIRECT_REF, or if TYPE_ALIGN_OK. */
1738 if (objectp
|| TREE_CODE (t
) == INDIRECT_REF
|| TYPE_ALIGN_OK (type
))
1739 align
= MAX (align
, TYPE_ALIGN (type
));
1741 /* If the size is known, we can set that. */
1742 if (TYPE_SIZE_UNIT (type
) && host_integerp (TYPE_SIZE_UNIT (type
), 1))
1743 size
= GEN_INT (tree_low_cst (TYPE_SIZE_UNIT (type
), 1));
1745 /* If T is not a type, we may be able to deduce some more information about
1749 maybe_set_unchanging (ref
, t
);
1750 if (TREE_THIS_VOLATILE (t
))
1751 MEM_VOLATILE_P (ref
) = 1;
1753 /* Now remove any conversions: they don't change what the underlying
1754 object is. Likewise for SAVE_EXPR. */
1755 while (TREE_CODE (t
) == NOP_EXPR
|| TREE_CODE (t
) == CONVERT_EXPR
1756 || TREE_CODE (t
) == NON_LVALUE_EXPR
1757 || TREE_CODE (t
) == VIEW_CONVERT_EXPR
1758 || TREE_CODE (t
) == SAVE_EXPR
)
1759 t
= TREE_OPERAND (t
, 0);
1761 /* If this expression can't be addressed (e.g., it contains a reference
1762 to a non-addressable field), show we don't change its alias set. */
1763 if (! can_address_p (t
))
1764 MEM_KEEP_ALIAS_SET_P (ref
) = 1;
1766 /* If this is a decl, set the attributes of the MEM from it. */
1770 offset
= const0_rtx
;
1771 apply_bitpos
= bitpos
;
1772 size
= (DECL_SIZE_UNIT (t
)
1773 && host_integerp (DECL_SIZE_UNIT (t
), 1)
1774 ? GEN_INT (tree_low_cst (DECL_SIZE_UNIT (t
), 1)) : 0);
1775 align
= DECL_ALIGN (t
);
1778 /* If this is a constant, we know the alignment. */
1779 else if (TREE_CODE_CLASS (TREE_CODE (t
)) == 'c')
1781 align
= TYPE_ALIGN (type
);
1782 #ifdef CONSTANT_ALIGNMENT
1783 align
= CONSTANT_ALIGNMENT (t
, align
);
1787 /* If this is a field reference and not a bit-field, record it. */
1788 /* ??? There is some information that can be gleened from bit-fields,
1789 such as the word offset in the structure that might be modified.
1790 But skip it for now. */
1791 else if (TREE_CODE (t
) == COMPONENT_REF
1792 && ! DECL_BIT_FIELD (TREE_OPERAND (t
, 1)))
1794 expr
= component_ref_for_mem_expr (t
);
1795 offset
= const0_rtx
;
1796 apply_bitpos
= bitpos
;
1797 /* ??? Any reason the field size would be different than
1798 the size we got from the type? */
1801 /* If this is an array reference, look for an outer field reference. */
1802 else if (TREE_CODE (t
) == ARRAY_REF
)
1804 tree off_tree
= size_zero_node
;
1808 tree index
= TREE_OPERAND (t
, 1);
1809 tree array
= TREE_OPERAND (t
, 0);
1810 tree domain
= TYPE_DOMAIN (TREE_TYPE (array
));
1811 tree low_bound
= (domain
? TYPE_MIN_VALUE (domain
) : 0);
1812 tree unit_size
= TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (array
)));
1814 /* We assume all arrays have sizes that are a multiple of a byte.
1815 First subtract the lower bound, if any, in the type of the
1816 index, then convert to sizetype and multiply by the size of the
1818 if (low_bound
!= 0 && ! integer_zerop (low_bound
))
1819 index
= fold (build (MINUS_EXPR
, TREE_TYPE (index
),
1822 /* If the index has a self-referential type, pass it to a
1823 WITH_RECORD_EXPR; if the component size is, pass our
1824 component to one. */
1825 if (! TREE_CONSTANT (index
)
1826 && contains_placeholder_p (index
))
1827 index
= build (WITH_RECORD_EXPR
, TREE_TYPE (index
), index
, t
);
1828 if (! TREE_CONSTANT (unit_size
)
1829 && contains_placeholder_p (unit_size
))
1830 unit_size
= build (WITH_RECORD_EXPR
, sizetype
,
1834 = fold (build (PLUS_EXPR
, sizetype
,
1835 fold (build (MULT_EXPR
, sizetype
,
1839 t
= TREE_OPERAND (t
, 0);
1841 while (TREE_CODE (t
) == ARRAY_REF
);
1847 if (host_integerp (off_tree
, 1))
1849 HOST_WIDE_INT ioff
= tree_low_cst (off_tree
, 1);
1850 HOST_WIDE_INT aoff
= (ioff
& -ioff
) * BITS_PER_UNIT
;
1851 align
= DECL_ALIGN (t
);
1852 if (aoff
&& (unsigned HOST_WIDE_INT
) aoff
< align
)
1854 offset
= GEN_INT (ioff
);
1855 apply_bitpos
= bitpos
;
1858 else if (TREE_CODE (t
) == COMPONENT_REF
)
1860 expr
= component_ref_for_mem_expr (t
);
1861 if (host_integerp (off_tree
, 1))
1863 offset
= GEN_INT (tree_low_cst (off_tree
, 1));
1864 apply_bitpos
= bitpos
;
1866 /* ??? Any reason the field size would be different than
1867 the size we got from the type? */
1869 else if (flag_argument_noalias
> 1
1870 && TREE_CODE (t
) == INDIRECT_REF
1871 && TREE_CODE (TREE_OPERAND (t
, 0)) == PARM_DECL
)
1878 /* If this is a Fortran indirect argument reference, record the
1880 else if (flag_argument_noalias
> 1
1881 && TREE_CODE (t
) == INDIRECT_REF
1882 && TREE_CODE (TREE_OPERAND (t
, 0)) == PARM_DECL
)
1889 /* If we modified OFFSET based on T, then subtract the outstanding
1890 bit position offset. Similarly, increase the size of the accessed
1891 object to contain the negative offset. */
1894 offset
= plus_constant (offset
, -(apply_bitpos
/ BITS_PER_UNIT
));
1896 size
= plus_constant (size
, apply_bitpos
/ BITS_PER_UNIT
);
1899 /* Now set the attributes we computed above. */
1901 = get_mem_attrs (alias
, expr
, offset
, size
, align
, GET_MODE (ref
));
1903 /* If this is already known to be a scalar or aggregate, we are done. */
1904 if (MEM_IN_STRUCT_P (ref
) || MEM_SCALAR_P (ref
))
1907 /* If it is a reference into an aggregate, this is part of an aggregate.
1908 Otherwise we don't know. */
1909 else if (TREE_CODE (t
) == COMPONENT_REF
|| TREE_CODE (t
) == ARRAY_REF
1910 || TREE_CODE (t
) == ARRAY_RANGE_REF
1911 || TREE_CODE (t
) == BIT_FIELD_REF
)
1912 MEM_IN_STRUCT_P (ref
) = 1;
1916 set_mem_attributes (ref
, t
, objectp
)
1921 set_mem_attributes_minus_bitpos (ref
, t
, objectp
, 0);
1924 /* Set the alias set of MEM to SET. */
1927 set_mem_alias_set (mem
, set
)
1931 #ifdef ENABLE_CHECKING
1932 /* If the new and old alias sets don't conflict, something is wrong. */
1933 if (!alias_sets_conflict_p (set
, MEM_ALIAS_SET (mem
)))
1937 MEM_ATTRS (mem
) = get_mem_attrs (set
, MEM_EXPR (mem
), MEM_OFFSET (mem
),
1938 MEM_SIZE (mem
), MEM_ALIGN (mem
),
1942 /* Set the alignment of MEM to ALIGN bits. */
1945 set_mem_align (mem
, align
)
1949 MEM_ATTRS (mem
) = get_mem_attrs (MEM_ALIAS_SET (mem
), MEM_EXPR (mem
),
1950 MEM_OFFSET (mem
), MEM_SIZE (mem
), align
,
1954 /* Set the expr for MEM to EXPR. */
1957 set_mem_expr (mem
, expr
)
1962 = get_mem_attrs (MEM_ALIAS_SET (mem
), expr
, MEM_OFFSET (mem
),
1963 MEM_SIZE (mem
), MEM_ALIGN (mem
), GET_MODE (mem
));
1966 /* Set the offset of MEM to OFFSET. */
1969 set_mem_offset (mem
, offset
)
1972 MEM_ATTRS (mem
) = get_mem_attrs (MEM_ALIAS_SET (mem
), MEM_EXPR (mem
),
1973 offset
, MEM_SIZE (mem
), MEM_ALIGN (mem
),
1977 /* Set the size of MEM to SIZE. */
1980 set_mem_size (mem
, size
)
1983 MEM_ATTRS (mem
) = get_mem_attrs (MEM_ALIAS_SET (mem
), MEM_EXPR (mem
),
1984 MEM_OFFSET (mem
), size
, MEM_ALIGN (mem
),
1988 /* Return a memory reference like MEMREF, but with its mode changed to MODE
1989 and its address changed to ADDR. (VOIDmode means don't change the mode.
1990 NULL for ADDR means don't change the address.) VALIDATE is nonzero if the
1991 returned memory location is required to be valid. The memory
1992 attributes are not changed. */
1995 change_address_1 (memref
, mode
, addr
, validate
)
1997 enum machine_mode mode
;
2003 if (GET_CODE (memref
) != MEM
)
2005 if (mode
== VOIDmode
)
2006 mode
= GET_MODE (memref
);
2008 addr
= XEXP (memref
, 0);
2012 if (reload_in_progress
|| reload_completed
)
2014 if (! memory_address_p (mode
, addr
))
2018 addr
= memory_address (mode
, addr
);
2021 if (rtx_equal_p (addr
, XEXP (memref
, 0)) && mode
== GET_MODE (memref
))
2024 new = gen_rtx_MEM (mode
, addr
);
2025 MEM_COPY_ATTRIBUTES (new, memref
);
2029 /* Like change_address_1 with VALIDATE nonzero, but we are not saying in what
2030 way we are changing MEMREF, so we only preserve the alias set. */
2033 change_address (memref
, mode
, addr
)
2035 enum machine_mode mode
;
2038 rtx
new = change_address_1 (memref
, mode
, addr
, 1);
2039 enum machine_mode mmode
= GET_MODE (new);
2042 = get_mem_attrs (MEM_ALIAS_SET (memref
), 0, 0,
2043 mmode
== BLKmode
? 0 : GEN_INT (GET_MODE_SIZE (mmode
)),
2044 (mmode
== BLKmode
? BITS_PER_UNIT
2045 : GET_MODE_ALIGNMENT (mmode
)),
2051 /* Return a memory reference like MEMREF, but with its mode changed
2052 to MODE and its address offset by OFFSET bytes. If VALIDATE is
2053 nonzero, the memory address is forced to be valid.
2054 If ADJUST is zero, OFFSET is only used to update MEM_ATTRS
2055 and caller is responsible for adjusting MEMREF base register. */
2058 adjust_address_1 (memref
, mode
, offset
, validate
, adjust
)
2060 enum machine_mode mode
;
2061 HOST_WIDE_INT offset
;
2062 int validate
, adjust
;
2064 rtx addr
= XEXP (memref
, 0);
2066 rtx memoffset
= MEM_OFFSET (memref
);
2068 unsigned int memalign
= MEM_ALIGN (memref
);
2070 /* ??? Prefer to create garbage instead of creating shared rtl.
2071 This may happen even if offset is nonzero -- consider
2072 (plus (plus reg reg) const_int) -- so do this always. */
2073 addr
= copy_rtx (addr
);
2077 /* If MEMREF is a LO_SUM and the offset is within the alignment of the
2078 object, we can merge it into the LO_SUM. */
2079 if (GET_MODE (memref
) != BLKmode
&& GET_CODE (addr
) == LO_SUM
2081 && (unsigned HOST_WIDE_INT
) offset
2082 < GET_MODE_ALIGNMENT (GET_MODE (memref
)) / BITS_PER_UNIT
)
2083 addr
= gen_rtx_LO_SUM (Pmode
, XEXP (addr
, 0),
2084 plus_constant (XEXP (addr
, 1), offset
));
2086 addr
= plus_constant (addr
, offset
);
2089 new = change_address_1 (memref
, mode
, addr
, validate
);
2091 /* Compute the new values of the memory attributes due to this adjustment.
2092 We add the offsets and update the alignment. */
2094 memoffset
= GEN_INT (offset
+ INTVAL (memoffset
));
2096 /* Compute the new alignment by taking the MIN of the alignment and the
2097 lowest-order set bit in OFFSET, but don't change the alignment if OFFSET
2102 (unsigned HOST_WIDE_INT
) (offset
& -offset
) * BITS_PER_UNIT
);
2104 /* We can compute the size in a number of ways. */
2105 if (GET_MODE (new) != BLKmode
)
2106 size
= GEN_INT (GET_MODE_SIZE (GET_MODE (new)));
2107 else if (MEM_SIZE (memref
))
2108 size
= plus_constant (MEM_SIZE (memref
), -offset
);
2110 MEM_ATTRS (new) = get_mem_attrs (MEM_ALIAS_SET (memref
), MEM_EXPR (memref
),
2111 memoffset
, size
, memalign
, GET_MODE (new));
2113 /* At some point, we should validate that this offset is within the object,
2114 if all the appropriate values are known. */
2118 /* Return a memory reference like MEMREF, but with its mode changed
2119 to MODE and its address changed to ADDR, which is assumed to be
2120 MEMREF offseted by OFFSET bytes. If VALIDATE is
2121 nonzero, the memory address is forced to be valid. */
2124 adjust_automodify_address_1 (memref
, mode
, addr
, offset
, validate
)
2126 enum machine_mode mode
;
2128 HOST_WIDE_INT offset
;
2131 memref
= change_address_1 (memref
, VOIDmode
, addr
, validate
);
2132 return adjust_address_1 (memref
, mode
, offset
, validate
, 0);
2135 /* Return a memory reference like MEMREF, but whose address is changed by
2136 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
2137 known to be in OFFSET (possibly 1). */
2140 offset_address (memref
, offset
, pow2
)
2145 rtx
new, addr
= XEXP (memref
, 0);
2147 new = simplify_gen_binary (PLUS
, Pmode
, addr
, offset
);
2149 /* At this point we don't know _why_ the address is invalid. It
2150 could have secondary memory refereces, multiplies or anything.
2152 However, if we did go and rearrange things, we can wind up not
2153 being able to recognize the magic around pic_offset_table_rtx.
2154 This stuff is fragile, and is yet another example of why it is
2155 bad to expose PIC machinery too early. */
2156 if (! memory_address_p (GET_MODE (memref
), new)
2157 && GET_CODE (addr
) == PLUS
2158 && XEXP (addr
, 0) == pic_offset_table_rtx
)
2160 addr
= force_reg (GET_MODE (addr
), addr
);
2161 new = simplify_gen_binary (PLUS
, Pmode
, addr
, offset
);
2164 update_temp_slot_address (XEXP (memref
, 0), new);
2165 new = change_address_1 (memref
, VOIDmode
, new, 1);
2167 /* Update the alignment to reflect the offset. Reset the offset, which
2170 = get_mem_attrs (MEM_ALIAS_SET (memref
), MEM_EXPR (memref
), 0, 0,
2171 MIN (MEM_ALIGN (memref
),
2172 (unsigned HOST_WIDE_INT
) pow2
* BITS_PER_UNIT
),
2177 /* Return a memory reference like MEMREF, but with its address changed to
2178 ADDR. The caller is asserting that the actual piece of memory pointed
2179 to is the same, just the form of the address is being changed, such as
2180 by putting something into a register. */
2183 replace_equiv_address (memref
, addr
)
2187 /* change_address_1 copies the memory attribute structure without change
2188 and that's exactly what we want here. */
2189 update_temp_slot_address (XEXP (memref
, 0), addr
);
2190 return change_address_1 (memref
, VOIDmode
, addr
, 1);
2193 /* Likewise, but the reference is not required to be valid. */
2196 replace_equiv_address_nv (memref
, addr
)
2200 return change_address_1 (memref
, VOIDmode
, addr
, 0);
2203 /* Return a memory reference like MEMREF, but with its mode widened to
2204 MODE and offset by OFFSET. This would be used by targets that e.g.
2205 cannot issue QImode memory operations and have to use SImode memory
2206 operations plus masking logic. */
2209 widen_memory_access (memref
, mode
, offset
)
2211 enum machine_mode mode
;
2212 HOST_WIDE_INT offset
;
2214 rtx
new = adjust_address_1 (memref
, mode
, offset
, 1, 1);
2215 tree expr
= MEM_EXPR (new);
2216 rtx memoffset
= MEM_OFFSET (new);
2217 unsigned int size
= GET_MODE_SIZE (mode
);
2219 /* If we don't know what offset we were at within the expression, then
2220 we can't know if we've overstepped the bounds. */
2226 if (TREE_CODE (expr
) == COMPONENT_REF
)
2228 tree field
= TREE_OPERAND (expr
, 1);
2230 if (! DECL_SIZE_UNIT (field
))
2236 /* Is the field at least as large as the access? If so, ok,
2237 otherwise strip back to the containing structure. */
2238 if (TREE_CODE (DECL_SIZE_UNIT (field
)) == INTEGER_CST
2239 && compare_tree_int (DECL_SIZE_UNIT (field
), size
) >= 0
2240 && INTVAL (memoffset
) >= 0)
2243 if (! host_integerp (DECL_FIELD_OFFSET (field
), 1))
2249 expr
= TREE_OPERAND (expr
, 0);
2250 memoffset
= (GEN_INT (INTVAL (memoffset
)
2251 + tree_low_cst (DECL_FIELD_OFFSET (field
), 1)
2252 + (tree_low_cst (DECL_FIELD_BIT_OFFSET (field
), 1)
2255 /* Similarly for the decl. */
2256 else if (DECL_P (expr
)
2257 && DECL_SIZE_UNIT (expr
)
2258 && TREE_CODE (DECL_SIZE_UNIT (expr
)) == INTEGER_CST
2259 && compare_tree_int (DECL_SIZE_UNIT (expr
), size
) >= 0
2260 && (! memoffset
|| INTVAL (memoffset
) >= 0))
2264 /* The widened memory access overflows the expression, which means
2265 that it could alias another expression. Zap it. */
2272 memoffset
= NULL_RTX
;
2274 /* The widened memory may alias other stuff, so zap the alias set. */
2275 /* ??? Maybe use get_alias_set on any remaining expression. */
2277 MEM_ATTRS (new) = get_mem_attrs (0, expr
, memoffset
, GEN_INT (size
),
2278 MEM_ALIGN (new), mode
);
2283 /* Return a newly created CODE_LABEL rtx with a unique label number. */
2288 return gen_rtx_CODE_LABEL (VOIDmode
, 0, NULL_RTX
, NULL_RTX
,
2289 NULL
, label_num
++, NULL
);
2292 /* For procedure integration. */
2294 /* Install new pointers to the first and last insns in the chain.
2295 Also, set cur_insn_uid to one higher than the last in use.
2296 Used for an inline-procedure after copying the insn chain. */
2299 set_new_first_and_last_insn (first
, last
)
2308 for (insn
= first
; insn
; insn
= NEXT_INSN (insn
))
2309 cur_insn_uid
= MAX (cur_insn_uid
, INSN_UID (insn
));
2314 /* Set the range of label numbers found in the current function.
2315 This is used when belatedly compiling an inline function. */
2318 set_new_first_and_last_label_num (first
, last
)
2321 base_label_num
= label_num
;
2322 first_label_num
= first
;
2323 last_label_num
= last
;
2326 /* Set the last label number found in the current function.
2327 This is used when belatedly compiling an inline function. */
2330 set_new_last_label_num (last
)
2333 base_label_num
= label_num
;
2334 last_label_num
= last
;
2337 /* Restore all variables describing the current status from the structure *P.
2338 This is used after a nested function. */
2341 restore_emit_status (p
)
2342 struct function
*p ATTRIBUTE_UNUSED
;
2347 /* Go through all the RTL insn bodies and copy any invalid shared
2348 structure. This routine should only be called once. */
2351 unshare_all_rtl (fndecl
, insn
)
2357 /* Make sure that virtual parameters are not shared. */
2358 for (decl
= DECL_ARGUMENTS (fndecl
); decl
; decl
= TREE_CHAIN (decl
))
2359 SET_DECL_RTL (decl
, copy_rtx_if_shared (DECL_RTL (decl
)));
2361 /* Make sure that virtual stack slots are not shared. */
2362 unshare_all_decls (DECL_INITIAL (fndecl
));
2364 /* Unshare just about everything else. */
2365 unshare_all_rtl_1 (insn
);
2367 /* Make sure the addresses of stack slots found outside the insn chain
2368 (such as, in DECL_RTL of a variable) are not shared
2369 with the insn chain.
2371 This special care is necessary when the stack slot MEM does not
2372 actually appear in the insn chain. If it does appear, its address
2373 is unshared from all else at that point. */
2374 stack_slot_list
= copy_rtx_if_shared (stack_slot_list
);
2377 /* Go through all the RTL insn bodies and copy any invalid shared
2378 structure, again. This is a fairly expensive thing to do so it
2379 should be done sparingly. */
2382 unshare_all_rtl_again (insn
)
2388 for (p
= insn
; p
; p
= NEXT_INSN (p
))
2391 reset_used_flags (PATTERN (p
));
2392 reset_used_flags (REG_NOTES (p
));
2393 reset_used_flags (LOG_LINKS (p
));
2396 /* Make sure that virtual stack slots are not shared. */
2397 reset_used_decls (DECL_INITIAL (cfun
->decl
));
2399 /* Make sure that virtual parameters are not shared. */
2400 for (decl
= DECL_ARGUMENTS (cfun
->decl
); decl
; decl
= TREE_CHAIN (decl
))
2401 reset_used_flags (DECL_RTL (decl
));
2403 reset_used_flags (stack_slot_list
);
2405 unshare_all_rtl (cfun
->decl
, insn
);
2408 /* Go through all the RTL insn bodies and copy any invalid shared structure.
2409 Assumes the mark bits are cleared at entry. */
2412 unshare_all_rtl_1 (insn
)
2415 for (; insn
; insn
= NEXT_INSN (insn
))
2418 PATTERN (insn
) = copy_rtx_if_shared (PATTERN (insn
));
2419 REG_NOTES (insn
) = copy_rtx_if_shared (REG_NOTES (insn
));
2420 LOG_LINKS (insn
) = copy_rtx_if_shared (LOG_LINKS (insn
));
2424 /* Go through all virtual stack slots of a function and copy any
2425 shared structure. */
2427 unshare_all_decls (blk
)
2432 /* Copy shared decls. */
2433 for (t
= BLOCK_VARS (blk
); t
; t
= TREE_CHAIN (t
))
2434 if (DECL_RTL_SET_P (t
))
2435 SET_DECL_RTL (t
, copy_rtx_if_shared (DECL_RTL (t
)));
2437 /* Now process sub-blocks. */
2438 for (t
= BLOCK_SUBBLOCKS (blk
); t
; t
= TREE_CHAIN (t
))
2439 unshare_all_decls (t
);
2442 /* Go through all virtual stack slots of a function and mark them as
2445 reset_used_decls (blk
)
2451 for (t
= BLOCK_VARS (blk
); t
; t
= TREE_CHAIN (t
))
2452 if (DECL_RTL_SET_P (t
))
2453 reset_used_flags (DECL_RTL (t
));
2455 /* Now process sub-blocks. */
2456 for (t
= BLOCK_SUBBLOCKS (blk
); t
; t
= TREE_CHAIN (t
))
2457 reset_used_decls (t
);
2460 /* Similar to `copy_rtx' except that if MAY_SHARE is present, it is
2461 placed in the result directly, rather than being copied. MAY_SHARE is
2462 either a MEM of an EXPR_LIST of MEMs. */
2465 copy_most_rtx (orig
, may_share
)
2472 const char *format_ptr
;
2474 if (orig
== may_share
2475 || (GET_CODE (may_share
) == EXPR_LIST
2476 && in_expr_list_p (may_share
, orig
)))
2479 code
= GET_CODE (orig
);
2497 copy
= rtx_alloc (code
);
2498 PUT_MODE (copy
, GET_MODE (orig
));
2499 RTX_FLAG (copy
, in_struct
) = RTX_FLAG (orig
, in_struct
);
2500 RTX_FLAG (copy
, volatil
) = RTX_FLAG (orig
, volatil
);
2501 RTX_FLAG (copy
, unchanging
) = RTX_FLAG (orig
, unchanging
);
2502 RTX_FLAG (copy
, integrated
) = RTX_FLAG (orig
, integrated
);
2503 RTX_FLAG (copy
, frame_related
) = RTX_FLAG (orig
, frame_related
);
2505 format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
2507 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
2509 switch (*format_ptr
++)
2512 XEXP (copy
, i
) = XEXP (orig
, i
);
2513 if (XEXP (orig
, i
) != NULL
&& XEXP (orig
, i
) != may_share
)
2514 XEXP (copy
, i
) = copy_most_rtx (XEXP (orig
, i
), may_share
);
2518 XEXP (copy
, i
) = XEXP (orig
, i
);
2523 XVEC (copy
, i
) = XVEC (orig
, i
);
2524 if (XVEC (orig
, i
) != NULL
)
2526 XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
2527 for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
2528 XVECEXP (copy
, i
, j
)
2529 = copy_most_rtx (XVECEXP (orig
, i
, j
), may_share
);
2534 XWINT (copy
, i
) = XWINT (orig
, i
);
2539 XINT (copy
, i
) = XINT (orig
, i
);
2543 XTREE (copy
, i
) = XTREE (orig
, i
);
2548 XSTR (copy
, i
) = XSTR (orig
, i
);
2552 /* Copy this through the wide int field; that's safest. */
2553 X0WINT (copy
, i
) = X0WINT (orig
, i
);
2563 /* Mark ORIG as in use, and return a copy of it if it was already in use.
2564 Recursively does the same for subexpressions. */
2567 copy_rtx_if_shared (orig
)
2573 const char *format_ptr
;
2579 code
= GET_CODE (x
);
2581 /* These types may be freely shared. */
2595 /* SCRATCH must be shared because they represent distinct values. */
2599 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
2600 a LABEL_REF, it isn't sharable. */
2601 if (GET_CODE (XEXP (x
, 0)) == PLUS
2602 && GET_CODE (XEXP (XEXP (x
, 0), 0)) == SYMBOL_REF
2603 && GET_CODE (XEXP (XEXP (x
, 0), 1)) == CONST_INT
)
2612 /* The chain of insns is not being copied. */
2616 /* A MEM is allowed to be shared if its address is constant.
2618 We used to allow sharing of MEMs which referenced
2619 virtual_stack_vars_rtx or virtual_incoming_args_rtx, but
2620 that can lose. instantiate_virtual_regs will not unshare
2621 the MEMs, and combine may change the structure of the address
2622 because it looks safe and profitable in one context, but
2623 in some other context it creates unrecognizable RTL. */
2624 if (CONSTANT_ADDRESS_P (XEXP (x
, 0)))
2633 /* This rtx may not be shared. If it has already been seen,
2634 replace it with a copy of itself. */
2636 if (RTX_FLAG (x
, used
))
2640 copy
= rtx_alloc (code
);
2642 (sizeof (*copy
) - sizeof (copy
->fld
)
2643 + sizeof (copy
->fld
[0]) * GET_RTX_LENGTH (code
)));
2647 RTX_FLAG (x
, used
) = 1;
2649 /* Now scan the subexpressions recursively.
2650 We can store any replaced subexpressions directly into X
2651 since we know X is not shared! Any vectors in X
2652 must be copied if X was copied. */
2654 format_ptr
= GET_RTX_FORMAT (code
);
2656 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++)
2658 switch (*format_ptr
++)
2661 XEXP (x
, i
) = copy_rtx_if_shared (XEXP (x
, i
));
2665 if (XVEC (x
, i
) != NULL
)
2668 int len
= XVECLEN (x
, i
);
2670 if (copied
&& len
> 0)
2671 XVEC (x
, i
) = gen_rtvec_v (len
, XVEC (x
, i
)->elem
);
2672 for (j
= 0; j
< len
; j
++)
2673 XVECEXP (x
, i
, j
) = copy_rtx_if_shared (XVECEXP (x
, i
, j
));
2681 /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used
2682 to look for shared sub-parts. */
2685 reset_used_flags (x
)
2690 const char *format_ptr
;
2695 code
= GET_CODE (x
);
2697 /* These types may be freely shared so we needn't do any resetting
2719 /* The chain of insns is not being copied. */
2726 RTX_FLAG (x
, used
) = 0;
2728 format_ptr
= GET_RTX_FORMAT (code
);
2729 for (i
= 0; i
< GET_RTX_LENGTH (code
); i
++)
2731 switch (*format_ptr
++)
2734 reset_used_flags (XEXP (x
, i
));
2738 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
2739 reset_used_flags (XVECEXP (x
, i
, j
));
2745 /* Copy X if necessary so that it won't be altered by changes in OTHER.
2746 Return X or the rtx for the pseudo reg the value of X was copied into.
2747 OTHER must be valid as a SET_DEST. */
2750 make_safe_from (x
, other
)
2754 switch (GET_CODE (other
))
2757 other
= SUBREG_REG (other
);
2759 case STRICT_LOW_PART
:
2762 other
= XEXP (other
, 0);
2768 if ((GET_CODE (other
) == MEM
2770 && GET_CODE (x
) != REG
2771 && GET_CODE (x
) != SUBREG
)
2772 || (GET_CODE (other
) == REG
2773 && (REGNO (other
) < FIRST_PSEUDO_REGISTER
2774 || reg_mentioned_p (other
, x
))))
2776 rtx temp
= gen_reg_rtx (GET_MODE (x
));
2777 emit_move_insn (temp
, x
);
2783 /* Emission of insns (adding them to the doubly-linked list). */
2785 /* Return the first insn of the current sequence or current function. */
2793 /* Specify a new insn as the first in the chain. */
2796 set_first_insn (insn
)
2799 if (PREV_INSN (insn
) != 0)
2804 /* Return the last insn emitted in current sequence or current function. */
2812 /* Specify a new insn as the last in the chain. */
2815 set_last_insn (insn
)
2818 if (NEXT_INSN (insn
) != 0)
2823 /* Return the last insn emitted, even if it is in a sequence now pushed. */
2826 get_last_insn_anywhere ()
2828 struct sequence_stack
*stack
;
2831 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
2832 if (stack
->last
!= 0)
2837 /* Return the first nonnote insn emitted in current sequence or current
2838 function. This routine looks inside SEQUENCEs. */
2841 get_first_nonnote_insn ()
2843 rtx insn
= first_insn
;
2847 insn
= next_insn (insn
);
2848 if (insn
== 0 || GET_CODE (insn
) != NOTE
)
2855 /* Return the last nonnote insn emitted in current sequence or current
2856 function. This routine looks inside SEQUENCEs. */
2859 get_last_nonnote_insn ()
2861 rtx insn
= last_insn
;
2865 insn
= previous_insn (insn
);
2866 if (insn
== 0 || GET_CODE (insn
) != NOTE
)
2873 /* Return a number larger than any instruction's uid in this function. */
2878 return cur_insn_uid
;
2881 /* Renumber instructions so that no instruction UIDs are wasted. */
2884 renumber_insns (stream
)
2889 /* If we're not supposed to renumber instructions, don't. */
2890 if (!flag_renumber_insns
)
2893 /* If there aren't that many instructions, then it's not really
2894 worth renumbering them. */
2895 if (flag_renumber_insns
== 1 && get_max_uid () < 25000)
2900 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
2903 fprintf (stream
, "Renumbering insn %d to %d\n",
2904 INSN_UID (insn
), cur_insn_uid
);
2905 INSN_UID (insn
) = cur_insn_uid
++;
2909 /* Return the next insn. If it is a SEQUENCE, return the first insn
2918 insn
= NEXT_INSN (insn
);
2919 if (insn
&& GET_CODE (insn
) == INSN
2920 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
2921 insn
= XVECEXP (PATTERN (insn
), 0, 0);
2927 /* Return the previous insn. If it is a SEQUENCE, return the last insn
2931 previous_insn (insn
)
2936 insn
= PREV_INSN (insn
);
2937 if (insn
&& GET_CODE (insn
) == INSN
2938 && GET_CODE (PATTERN (insn
)) == SEQUENCE
)
2939 insn
= XVECEXP (PATTERN (insn
), 0, XVECLEN (PATTERN (insn
), 0) - 1);
2945 /* Return the next insn after INSN that is not a NOTE. This routine does not
2946 look inside SEQUENCEs. */
2949 next_nonnote_insn (insn
)
2954 insn
= NEXT_INSN (insn
);
2955 if (insn
== 0 || GET_CODE (insn
) != NOTE
)
2962 /* Return the previous insn before INSN that is not a NOTE. This routine does
2963 not look inside SEQUENCEs. */
2966 prev_nonnote_insn (insn
)
2971 insn
= PREV_INSN (insn
);
2972 if (insn
== 0 || GET_CODE (insn
) != NOTE
)
2979 /* Return the next INSN, CALL_INSN or JUMP_INSN after INSN;
2980 or 0, if there is none. This routine does not look inside
2984 next_real_insn (insn
)
2989 insn
= NEXT_INSN (insn
);
2990 if (insn
== 0 || GET_CODE (insn
) == INSN
2991 || GET_CODE (insn
) == CALL_INSN
|| GET_CODE (insn
) == JUMP_INSN
)
2998 /* Return the last INSN, CALL_INSN or JUMP_INSN before INSN;
2999 or 0, if there is none. This routine does not look inside
3003 prev_real_insn (insn
)
3008 insn
= PREV_INSN (insn
);
3009 if (insn
== 0 || GET_CODE (insn
) == INSN
|| GET_CODE (insn
) == CALL_INSN
3010 || GET_CODE (insn
) == JUMP_INSN
)
3017 /* Find the next insn after INSN that really does something. This routine
3018 does not look inside SEQUENCEs. Until reload has completed, this is the
3019 same as next_real_insn. */
3022 active_insn_p (insn
)
3025 return (GET_CODE (insn
) == CALL_INSN
|| GET_CODE (insn
) == JUMP_INSN
3026 || (GET_CODE (insn
) == INSN
3027 && (! reload_completed
3028 || (GET_CODE (PATTERN (insn
)) != USE
3029 && GET_CODE (PATTERN (insn
)) != CLOBBER
))));
3033 next_active_insn (insn
)
3038 insn
= NEXT_INSN (insn
);
3039 if (insn
== 0 || active_insn_p (insn
))
3046 /* Find the last insn before INSN that really does something. This routine
3047 does not look inside SEQUENCEs. Until reload has completed, this is the
3048 same as prev_real_insn. */
3051 prev_active_insn (insn
)
3056 insn
= PREV_INSN (insn
);
3057 if (insn
== 0 || active_insn_p (insn
))
3064 /* Return the next CODE_LABEL after the insn INSN, or 0 if there is none. */
3072 insn
= NEXT_INSN (insn
);
3073 if (insn
== 0 || GET_CODE (insn
) == CODE_LABEL
)
3080 /* Return the last CODE_LABEL before the insn INSN, or 0 if there is none. */
3088 insn
= PREV_INSN (insn
);
3089 if (insn
== 0 || GET_CODE (insn
) == CODE_LABEL
)
3097 /* INSN uses CC0 and is being moved into a delay slot. Set up REG_CC_SETTER
3098 and REG_CC_USER notes so we can find it. */
3101 link_cc0_insns (insn
)
3104 rtx user
= next_nonnote_insn (insn
);
3106 if (GET_CODE (user
) == INSN
&& GET_CODE (PATTERN (user
)) == SEQUENCE
)
3107 user
= XVECEXP (PATTERN (user
), 0, 0);
3109 REG_NOTES (user
) = gen_rtx_INSN_LIST (REG_CC_SETTER
, insn
,
3111 REG_NOTES (insn
) = gen_rtx_INSN_LIST (REG_CC_USER
, user
, REG_NOTES (insn
));
3114 /* Return the next insn that uses CC0 after INSN, which is assumed to
3115 set it. This is the inverse of prev_cc0_setter (i.e., prev_cc0_setter
3116 applied to the result of this function should yield INSN).
3118 Normally, this is simply the next insn. However, if a REG_CC_USER note
3119 is present, it contains the insn that uses CC0.
3121 Return 0 if we can't find the insn. */
3124 next_cc0_user (insn
)
3127 rtx note
= find_reg_note (insn
, REG_CC_USER
, NULL_RTX
);
3130 return XEXP (note
, 0);
3132 insn
= next_nonnote_insn (insn
);
3133 if (insn
&& GET_CODE (insn
) == INSN
&& GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3134 insn
= XVECEXP (PATTERN (insn
), 0, 0);
3136 if (insn
&& INSN_P (insn
) && reg_mentioned_p (cc0_rtx
, PATTERN (insn
)))
3142 /* Find the insn that set CC0 for INSN. Unless INSN has a REG_CC_SETTER
3143 note, it is the previous insn. */
3146 prev_cc0_setter (insn
)
3149 rtx note
= find_reg_note (insn
, REG_CC_SETTER
, NULL_RTX
);
3152 return XEXP (note
, 0);
3154 insn
= prev_nonnote_insn (insn
);
3155 if (! sets_cc0_p (PATTERN (insn
)))
3162 /* Increment the label uses for all labels present in rtx. */
3165 mark_label_nuses (x
)
3172 code
= GET_CODE (x
);
3173 if (code
== LABEL_REF
)
3174 LABEL_NUSES (XEXP (x
, 0))++;
3176 fmt
= GET_RTX_FORMAT (code
);
3177 for (i
= GET_RTX_LENGTH (code
) - 1; i
>= 0; i
--)
3180 mark_label_nuses (XEXP (x
, i
));
3181 else if (fmt
[i
] == 'E')
3182 for (j
= XVECLEN (x
, i
) - 1; j
>= 0; j
--)
3183 mark_label_nuses (XVECEXP (x
, i
, j
));
3188 /* Try splitting insns that can be split for better scheduling.
3189 PAT is the pattern which might split.
3190 TRIAL is the insn providing PAT.
3191 LAST is nonzero if we should return the last insn of the sequence produced.
3193 If this routine succeeds in splitting, it returns the first or last
3194 replacement insn depending on the value of LAST. Otherwise, it
3195 returns TRIAL. If the insn to be returned can be split, it will be. */
3198 try_split (pat
, trial
, last
)
3202 rtx before
= PREV_INSN (trial
);
3203 rtx after
= NEXT_INSN (trial
);
3204 int has_barrier
= 0;
3209 if (any_condjump_p (trial
)
3210 && (note
= find_reg_note (trial
, REG_BR_PROB
, 0)))
3211 split_branch_probability
= INTVAL (XEXP (note
, 0));
3212 probability
= split_branch_probability
;
3214 seq
= split_insns (pat
, trial
);
3216 split_branch_probability
= -1;
3218 /* If we are splitting a JUMP_INSN, it might be followed by a BARRIER.
3219 We may need to handle this specially. */
3220 if (after
&& GET_CODE (after
) == BARRIER
)
3223 after
= NEXT_INSN (after
);
3228 /* Sometimes there will be only one insn in that list, this case will
3229 normally arise only when we want it in turn to be split (SFmode on
3230 the 29k is an example). */
3231 if (NEXT_INSN (seq
) != NULL_RTX
)
3233 rtx insn_last
, insn
;
3236 /* Avoid infinite loop if any insn of the result matches
3237 the original pattern. */
3241 if (INSN_P (insn_last
)
3242 && rtx_equal_p (PATTERN (insn_last
), pat
))
3244 if (NEXT_INSN (insn_last
) == NULL_RTX
)
3246 insn_last
= NEXT_INSN (insn_last
);
3251 while (insn
!= NULL_RTX
)
3253 if (GET_CODE (insn
) == JUMP_INSN
)
3255 mark_jump_label (PATTERN (insn
), insn
, 0);
3257 if (probability
!= -1
3258 && any_condjump_p (insn
)
3259 && !find_reg_note (insn
, REG_BR_PROB
, 0))
3261 /* We can preserve the REG_BR_PROB notes only if exactly
3262 one jump is created, otherwise the machine description
3263 is responsible for this step using
3264 split_branch_probability variable. */
3268 = gen_rtx_EXPR_LIST (REG_BR_PROB
,
3269 GEN_INT (probability
),
3274 insn
= PREV_INSN (insn
);
3277 /* If we are splitting a CALL_INSN, look for the CALL_INSN
3278 in SEQ and copy our CALL_INSN_FUNCTION_USAGE to it. */
3279 if (GET_CODE (trial
) == CALL_INSN
)
3282 while (insn
!= NULL_RTX
)
3284 if (GET_CODE (insn
) == CALL_INSN
)
3285 CALL_INSN_FUNCTION_USAGE (insn
)
3286 = CALL_INSN_FUNCTION_USAGE (trial
);
3288 insn
= PREV_INSN (insn
);
3292 /* Copy notes, particularly those related to the CFG. */
3293 for (note
= REG_NOTES (trial
); note
; note
= XEXP (note
, 1))
3295 switch (REG_NOTE_KIND (note
))
3299 while (insn
!= NULL_RTX
)
3301 if (GET_CODE (insn
) == CALL_INSN
3302 || (flag_non_call_exceptions
3303 && may_trap_p (PATTERN (insn
))))
3305 = gen_rtx_EXPR_LIST (REG_EH_REGION
,
3308 insn
= PREV_INSN (insn
);
3314 case REG_ALWAYS_RETURN
:
3316 while (insn
!= NULL_RTX
)
3318 if (GET_CODE (insn
) == CALL_INSN
)
3320 = gen_rtx_EXPR_LIST (REG_NOTE_KIND (note
),
3323 insn
= PREV_INSN (insn
);
3327 case REG_NON_LOCAL_GOTO
:
3329 while (insn
!= NULL_RTX
)
3331 if (GET_CODE (insn
) == JUMP_INSN
)
3333 = gen_rtx_EXPR_LIST (REG_NOTE_KIND (note
),
3336 insn
= PREV_INSN (insn
);
3345 /* If there are LABELS inside the split insns increment the
3346 usage count so we don't delete the label. */
3347 if (GET_CODE (trial
) == INSN
)
3350 while (insn
!= NULL_RTX
)
3352 if (GET_CODE (insn
) == INSN
)
3353 mark_label_nuses (PATTERN (insn
));
3355 insn
= PREV_INSN (insn
);
3359 tem
= emit_insn_after_scope (seq
, trial
, INSN_SCOPE (trial
));
3361 delete_insn (trial
);
3363 emit_barrier_after (tem
);
3365 /* Recursively call try_split for each new insn created; by the
3366 time control returns here that insn will be fully split, so
3367 set LAST and continue from the insn after the one returned.
3368 We can't use next_active_insn here since AFTER may be a note.
3369 Ignore deleted insns, which can be occur if not optimizing. */
3370 for (tem
= NEXT_INSN (before
); tem
!= after
; tem
= NEXT_INSN (tem
))
3371 if (! INSN_DELETED_P (tem
) && INSN_P (tem
))
3372 tem
= try_split (PATTERN (tem
), tem
, 1);
3374 /* Avoid infinite loop if the result matches the original pattern. */
3375 else if (rtx_equal_p (PATTERN (seq
), pat
))
3379 PATTERN (trial
) = PATTERN (seq
);
3380 INSN_CODE (trial
) = -1;
3381 try_split (PATTERN (trial
), trial
, last
);
3384 /* Return either the first or the last insn, depending on which was
3387 ? (after
? PREV_INSN (after
) : last_insn
)
3388 : NEXT_INSN (before
);
3394 /* Make and return an INSN rtx, initializing all its slots.
3395 Store PATTERN in the pattern slots. */
3398 make_insn_raw (pattern
)
3403 insn
= rtx_alloc (INSN
);
3405 INSN_UID (insn
) = cur_insn_uid
++;
3406 PATTERN (insn
) = pattern
;
3407 INSN_CODE (insn
) = -1;
3408 LOG_LINKS (insn
) = NULL
;
3409 REG_NOTES (insn
) = NULL
;
3410 INSN_SCOPE (insn
) = NULL
;
3411 BLOCK_FOR_INSN (insn
) = NULL
;
3413 #ifdef ENABLE_RTL_CHECKING
3416 && (returnjump_p (insn
)
3417 || (GET_CODE (insn
) == SET
3418 && SET_DEST (insn
) == pc_rtx
)))
3420 warning ("ICE: emit_insn used where emit_jump_insn needed:\n");
3428 /* Like `make_insn_raw' but make a JUMP_INSN instead of an insn. */
3431 make_jump_insn_raw (pattern
)
3436 insn
= rtx_alloc (JUMP_INSN
);
3437 INSN_UID (insn
) = cur_insn_uid
++;
3439 PATTERN (insn
) = pattern
;
3440 INSN_CODE (insn
) = -1;
3441 LOG_LINKS (insn
) = NULL
;
3442 REG_NOTES (insn
) = NULL
;
3443 JUMP_LABEL (insn
) = NULL
;
3444 INSN_SCOPE (insn
) = NULL
;
3445 BLOCK_FOR_INSN (insn
) = NULL
;
3450 /* Like `make_insn_raw' but make a CALL_INSN instead of an insn. */
3453 make_call_insn_raw (pattern
)
3458 insn
= rtx_alloc (CALL_INSN
);
3459 INSN_UID (insn
) = cur_insn_uid
++;
3461 PATTERN (insn
) = pattern
;
3462 INSN_CODE (insn
) = -1;
3463 LOG_LINKS (insn
) = NULL
;
3464 REG_NOTES (insn
) = NULL
;
3465 CALL_INSN_FUNCTION_USAGE (insn
) = NULL
;
3466 INSN_SCOPE (insn
) = NULL
;
3467 BLOCK_FOR_INSN (insn
) = NULL
;
3472 /* Add INSN to the end of the doubly-linked list.
3473 INSN may be an INSN, JUMP_INSN, CALL_INSN, CODE_LABEL, BARRIER or NOTE. */
3479 PREV_INSN (insn
) = last_insn
;
3480 NEXT_INSN (insn
) = 0;
3482 if (NULL
!= last_insn
)
3483 NEXT_INSN (last_insn
) = insn
;
3485 if (NULL
== first_insn
)
3491 /* Add INSN into the doubly-linked list after insn AFTER. This and
3492 the next should be the only functions called to insert an insn once
3493 delay slots have been filled since only they know how to update a
3497 add_insn_after (insn
, after
)
3500 rtx next
= NEXT_INSN (after
);
3503 if (optimize
&& INSN_DELETED_P (after
))
3506 NEXT_INSN (insn
) = next
;
3507 PREV_INSN (insn
) = after
;
3511 PREV_INSN (next
) = insn
;
3512 if (GET_CODE (next
) == INSN
&& GET_CODE (PATTERN (next
)) == SEQUENCE
)
3513 PREV_INSN (XVECEXP (PATTERN (next
), 0, 0)) = insn
;
3515 else if (last_insn
== after
)
3519 struct sequence_stack
*stack
= seq_stack
;
3520 /* Scan all pending sequences too. */
3521 for (; stack
; stack
= stack
->next
)
3522 if (after
== stack
->last
)
3532 if (GET_CODE (after
) != BARRIER
3533 && GET_CODE (insn
) != BARRIER
3534 && (bb
= BLOCK_FOR_INSN (after
)))
3536 set_block_for_insn (insn
, bb
);
3538 bb
->flags
|= BB_DIRTY
;
3539 /* Should not happen as first in the BB is always
3540 either NOTE or LABEL. */
3541 if (bb
->end
== after
3542 /* Avoid clobbering of structure when creating new BB. */
3543 && GET_CODE (insn
) != BARRIER
3544 && (GET_CODE (insn
) != NOTE
3545 || NOTE_LINE_NUMBER (insn
) != NOTE_INSN_BASIC_BLOCK
))
3549 NEXT_INSN (after
) = insn
;
3550 if (GET_CODE (after
) == INSN
&& GET_CODE (PATTERN (after
)) == SEQUENCE
)
3552 rtx sequence
= PATTERN (after
);
3553 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = insn
;
3557 /* Add INSN into the doubly-linked list before insn BEFORE. This and
3558 the previous should be the only functions called to insert an insn once
3559 delay slots have been filled since only they know how to update a
3563 add_insn_before (insn
, before
)
3566 rtx prev
= PREV_INSN (before
);
3569 if (optimize
&& INSN_DELETED_P (before
))
3572 PREV_INSN (insn
) = prev
;
3573 NEXT_INSN (insn
) = before
;
3577 NEXT_INSN (prev
) = insn
;
3578 if (GET_CODE (prev
) == INSN
&& GET_CODE (PATTERN (prev
)) == SEQUENCE
)
3580 rtx sequence
= PATTERN (prev
);
3581 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = insn
;
3584 else if (first_insn
== before
)
3588 struct sequence_stack
*stack
= seq_stack
;
3589 /* Scan all pending sequences too. */
3590 for (; stack
; stack
= stack
->next
)
3591 if (before
== stack
->first
)
3593 stack
->first
= insn
;
3601 if (GET_CODE (before
) != BARRIER
3602 && GET_CODE (insn
) != BARRIER
3603 && (bb
= BLOCK_FOR_INSN (before
)))
3605 set_block_for_insn (insn
, bb
);
3607 bb
->flags
|= BB_DIRTY
;
3608 /* Should not happen as first in the BB is always
3609 either NOTE or LABEl. */
3610 if (bb
->head
== insn
3611 /* Avoid clobbering of structure when creating new BB. */
3612 && GET_CODE (insn
) != BARRIER
3613 && (GET_CODE (insn
) != NOTE
3614 || NOTE_LINE_NUMBER (insn
) != NOTE_INSN_BASIC_BLOCK
))
3618 PREV_INSN (before
) = insn
;
3619 if (GET_CODE (before
) == INSN
&& GET_CODE (PATTERN (before
)) == SEQUENCE
)
3620 PREV_INSN (XVECEXP (PATTERN (before
), 0, 0)) = insn
;
3623 /* Remove an insn from its doubly-linked list. This function knows how
3624 to handle sequences. */
3629 rtx next
= NEXT_INSN (insn
);
3630 rtx prev
= PREV_INSN (insn
);
3635 NEXT_INSN (prev
) = next
;
3636 if (GET_CODE (prev
) == INSN
&& GET_CODE (PATTERN (prev
)) == SEQUENCE
)
3638 rtx sequence
= PATTERN (prev
);
3639 NEXT_INSN (XVECEXP (sequence
, 0, XVECLEN (sequence
, 0) - 1)) = next
;
3642 else if (first_insn
== insn
)
3646 struct sequence_stack
*stack
= seq_stack
;
3647 /* Scan all pending sequences too. */
3648 for (; stack
; stack
= stack
->next
)
3649 if (insn
== stack
->first
)
3651 stack
->first
= next
;
3661 PREV_INSN (next
) = prev
;
3662 if (GET_CODE (next
) == INSN
&& GET_CODE (PATTERN (next
)) == SEQUENCE
)
3663 PREV_INSN (XVECEXP (PATTERN (next
), 0, 0)) = prev
;
3665 else if (last_insn
== insn
)
3669 struct sequence_stack
*stack
= seq_stack
;
3670 /* Scan all pending sequences too. */
3671 for (; stack
; stack
= stack
->next
)
3672 if (insn
== stack
->last
)
3681 if (GET_CODE (insn
) != BARRIER
3682 && (bb
= BLOCK_FOR_INSN (insn
)))
3685 bb
->flags
|= BB_DIRTY
;
3686 if (bb
->head
== insn
)
3688 /* Never ever delete the basic block note without deleting whole
3690 if (GET_CODE (insn
) == NOTE
)
3694 if (bb
->end
== insn
)
3699 /* Delete all insns made since FROM.
3700 FROM becomes the new last instruction. */
3703 delete_insns_since (from
)
3709 NEXT_INSN (from
) = 0;
3713 /* This function is deprecated, please use sequences instead.
3715 Move a consecutive bunch of insns to a different place in the chain.
3716 The insns to be moved are those between FROM and TO.
3717 They are moved to a new position after the insn AFTER.
3718 AFTER must not be FROM or TO or any insn in between.
3720 This function does not know about SEQUENCEs and hence should not be
3721 called after delay-slot filling has been done. */
3724 reorder_insns_nobb (from
, to
, after
)
3725 rtx from
, to
, after
;
3727 /* Splice this bunch out of where it is now. */
3728 if (PREV_INSN (from
))
3729 NEXT_INSN (PREV_INSN (from
)) = NEXT_INSN (to
);
3731 PREV_INSN (NEXT_INSN (to
)) = PREV_INSN (from
);
3732 if (last_insn
== to
)
3733 last_insn
= PREV_INSN (from
);
3734 if (first_insn
== from
)
3735 first_insn
= NEXT_INSN (to
);
3737 /* Make the new neighbors point to it and it to them. */
3738 if (NEXT_INSN (after
))
3739 PREV_INSN (NEXT_INSN (after
)) = to
;
3741 NEXT_INSN (to
) = NEXT_INSN (after
);
3742 PREV_INSN (from
) = after
;
3743 NEXT_INSN (after
) = from
;
3744 if (after
== last_insn
)
3748 /* Same as function above, but take care to update BB boundaries. */
3750 reorder_insns (from
, to
, after
)
3751 rtx from
, to
, after
;
3753 rtx prev
= PREV_INSN (from
);
3754 basic_block bb
, bb2
;
3756 reorder_insns_nobb (from
, to
, after
);
3758 if (GET_CODE (after
) != BARRIER
3759 && (bb
= BLOCK_FOR_INSN (after
)))
3762 bb
->flags
|= BB_DIRTY
;
3764 if (GET_CODE (from
) != BARRIER
3765 && (bb2
= BLOCK_FOR_INSN (from
)))
3769 bb2
->flags
|= BB_DIRTY
;
3772 if (bb
->end
== after
)
3775 for (x
= from
; x
!= NEXT_INSN (to
); x
= NEXT_INSN (x
))
3776 set_block_for_insn (x
, bb
);
3780 /* Return the line note insn preceding INSN. */
3783 find_line_note (insn
)
3786 if (no_line_numbers
)
3789 for (; insn
; insn
= PREV_INSN (insn
))
3790 if (GET_CODE (insn
) == NOTE
3791 && NOTE_LINE_NUMBER (insn
) >= 0)
3797 /* Like reorder_insns, but inserts line notes to preserve the line numbers
3798 of the moved insns when debugging. This may insert a note between AFTER
3799 and FROM, and another one after TO. */
3802 reorder_insns_with_line_notes (from
, to
, after
)
3803 rtx from
, to
, after
;
3805 rtx from_line
= find_line_note (from
);
3806 rtx after_line
= find_line_note (after
);
3808 reorder_insns (from
, to
, after
);
3810 if (from_line
== after_line
)
3814 emit_line_note_after (NOTE_SOURCE_FILE (from_line
),
3815 NOTE_LINE_NUMBER (from_line
),
3818 emit_line_note_after (NOTE_SOURCE_FILE (after_line
),
3819 NOTE_LINE_NUMBER (after_line
),
3823 /* Remove unnecessary notes from the instruction stream. */
3826 remove_unnecessary_notes ()
3828 rtx block_stack
= NULL_RTX
;
3829 rtx eh_stack
= NULL_RTX
;
3834 /* We must not remove the first instruction in the function because
3835 the compiler depends on the first instruction being a note. */
3836 for (insn
= NEXT_INSN (get_insns ()); insn
; insn
= next
)
3838 /* Remember what's next. */
3839 next
= NEXT_INSN (insn
);
3841 /* We're only interested in notes. */
3842 if (GET_CODE (insn
) != NOTE
)
3845 switch (NOTE_LINE_NUMBER (insn
))
3847 case NOTE_INSN_DELETED
:
3848 case NOTE_INSN_LOOP_END_TOP_COND
:
3852 case NOTE_INSN_EH_REGION_BEG
:
3853 eh_stack
= alloc_INSN_LIST (insn
, eh_stack
);
3856 case NOTE_INSN_EH_REGION_END
:
3857 /* Too many end notes. */
3858 if (eh_stack
== NULL_RTX
)
3860 /* Mismatched nesting. */
3861 if (NOTE_EH_HANDLER (XEXP (eh_stack
, 0)) != NOTE_EH_HANDLER (insn
))
3864 eh_stack
= XEXP (eh_stack
, 1);
3865 free_INSN_LIST_node (tmp
);
3868 case NOTE_INSN_BLOCK_BEG
:
3869 /* By now, all notes indicating lexical blocks should have
3870 NOTE_BLOCK filled in. */
3871 if (NOTE_BLOCK (insn
) == NULL_TREE
)
3873 block_stack
= alloc_INSN_LIST (insn
, block_stack
);
3876 case NOTE_INSN_BLOCK_END
:
3877 /* Too many end notes. */
3878 if (block_stack
== NULL_RTX
)
3880 /* Mismatched nesting. */
3881 if (NOTE_BLOCK (XEXP (block_stack
, 0)) != NOTE_BLOCK (insn
))
3884 block_stack
= XEXP (block_stack
, 1);
3885 free_INSN_LIST_node (tmp
);
3887 /* Scan back to see if there are any non-note instructions
3888 between INSN and the beginning of this block. If not,
3889 then there is no PC range in the generated code that will
3890 actually be in this block, so there's no point in
3891 remembering the existence of the block. */
3892 for (tmp
= PREV_INSN (insn
); tmp
; tmp
= PREV_INSN (tmp
))
3894 /* This block contains a real instruction. Note that we
3895 don't include labels; if the only thing in the block
3896 is a label, then there are still no PC values that
3897 lie within the block. */
3901 /* We're only interested in NOTEs. */
3902 if (GET_CODE (tmp
) != NOTE
)
3905 if (NOTE_LINE_NUMBER (tmp
) == NOTE_INSN_BLOCK_BEG
)
3907 /* We just verified that this BLOCK matches us with
3908 the block_stack check above. Never delete the
3909 BLOCK for the outermost scope of the function; we
3910 can refer to names from that scope even if the
3911 block notes are messed up. */
3912 if (! is_body_block (NOTE_BLOCK (insn
))
3913 && (*debug_hooks
->ignore_block
) (NOTE_BLOCK (insn
)))
3920 else if (NOTE_LINE_NUMBER (tmp
) == NOTE_INSN_BLOCK_END
)
3921 /* There's a nested block. We need to leave the
3922 current block in place since otherwise the debugger
3923 wouldn't be able to show symbols from our block in
3924 the nested block. */
3930 /* Too many begin notes. */
3931 if (block_stack
|| eh_stack
)
3936 /* Emit insn(s) of given code and pattern
3937 at a specified place within the doubly-linked list.
3939 All of the emit_foo global entry points accept an object
3940 X which is either an insn list or a PATTERN of a single
3943 There are thus a few canonical ways to generate code and
3944 emit it at a specific place in the instruction stream. For
3945 example, consider the instruction named SPOT and the fact that
3946 we would like to emit some instructions before SPOT. We might
3950 ... emit the new instructions ...
3951 insns_head = get_insns ();
3954 emit_insn_before (insns_head, SPOT);
3956 It used to be common to generate SEQUENCE rtl instead, but that
3957 is a relic of the past which no longer occurs. The reason is that
3958 SEQUENCE rtl results in much fragmented RTL memory since the SEQUENCE
3959 generated would almost certainly die right after it was created. */
3961 /* Make X be output before the instruction BEFORE. */
3964 emit_insn_before (x
, before
)
3970 #ifdef ENABLE_RTL_CHECKING
3971 if (before
== NULL_RTX
)
3978 switch (GET_CODE (x
))
3989 rtx next
= NEXT_INSN (insn
);
3990 add_insn_before (insn
, before
);
3996 #ifdef ENABLE_RTL_CHECKING
4003 last
= make_insn_raw (x
);
4004 add_insn_before (last
, before
);
4011 /* Make an instruction with body X and code JUMP_INSN
4012 and output it before the instruction BEFORE. */
4015 emit_jump_insn_before (x
, before
)
4018 rtx insn
, last
= NULL_RTX
;
4020 #ifdef ENABLE_RTL_CHECKING
4021 if (before
== NULL_RTX
)
4025 switch (GET_CODE (x
))
4036 rtx next
= NEXT_INSN (insn
);
4037 add_insn_before (insn
, before
);
4043 #ifdef ENABLE_RTL_CHECKING
4050 last
= make_jump_insn_raw (x
);
4051 add_insn_before (last
, before
);
4058 /* Make an instruction with body X and code CALL_INSN
4059 and output it before the instruction BEFORE. */
4062 emit_call_insn_before (x
, before
)
4065 rtx last
= NULL_RTX
, insn
;
4067 #ifdef ENABLE_RTL_CHECKING
4068 if (before
== NULL_RTX
)
4072 switch (GET_CODE (x
))
4083 rtx next
= NEXT_INSN (insn
);
4084 add_insn_before (insn
, before
);
4090 #ifdef ENABLE_RTL_CHECKING
4097 last
= make_call_insn_raw (x
);
4098 add_insn_before (last
, before
);
4105 /* Make an insn of code BARRIER
4106 and output it before the insn BEFORE. */
4109 emit_barrier_before (before
)
4112 rtx insn
= rtx_alloc (BARRIER
);
4114 INSN_UID (insn
) = cur_insn_uid
++;
4116 add_insn_before (insn
, before
);
4120 /* Emit the label LABEL before the insn BEFORE. */
4123 emit_label_before (label
, before
)
4126 /* This can be called twice for the same label as a result of the
4127 confusion that follows a syntax error! So make it harmless. */
4128 if (INSN_UID (label
) == 0)
4130 INSN_UID (label
) = cur_insn_uid
++;
4131 add_insn_before (label
, before
);
4137 /* Emit a note of subtype SUBTYPE before the insn BEFORE. */
4140 emit_note_before (subtype
, before
)
4144 rtx note
= rtx_alloc (NOTE
);
4145 INSN_UID (note
) = cur_insn_uid
++;
4146 NOTE_SOURCE_FILE (note
) = 0;
4147 NOTE_LINE_NUMBER (note
) = subtype
;
4148 BLOCK_FOR_INSN (note
) = NULL
;
4150 add_insn_before (note
, before
);
4154 /* Helper for emit_insn_after, handles lists of instructions
4157 static rtx emit_insn_after_1
PARAMS ((rtx
, rtx
));
4160 emit_insn_after_1 (first
, after
)
4167 if (GET_CODE (after
) != BARRIER
4168 && (bb
= BLOCK_FOR_INSN (after
)))
4170 bb
->flags
|= BB_DIRTY
;
4171 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4172 if (GET_CODE (last
) != BARRIER
)
4173 set_block_for_insn (last
, bb
);
4174 if (GET_CODE (last
) != BARRIER
)
4175 set_block_for_insn (last
, bb
);
4176 if (bb
->end
== after
)
4180 for (last
= first
; NEXT_INSN (last
); last
= NEXT_INSN (last
))
4183 after_after
= NEXT_INSN (after
);
4185 NEXT_INSN (after
) = first
;
4186 PREV_INSN (first
) = after
;
4187 NEXT_INSN (last
) = after_after
;
4189 PREV_INSN (after_after
) = last
;
4191 if (after
== last_insn
)
4196 /* Make X be output after the insn AFTER. */
4199 emit_insn_after (x
, after
)
4204 #ifdef ENABLE_RTL_CHECKING
4205 if (after
== NULL_RTX
)
4212 switch (GET_CODE (x
))
4220 last
= emit_insn_after_1 (x
, after
);
4223 #ifdef ENABLE_RTL_CHECKING
4230 last
= make_insn_raw (x
);
4231 add_insn_after (last
, after
);
4238 /* Similar to emit_insn_after, except that line notes are to be inserted so
4239 as to act as if this insn were at FROM. */
4242 emit_insn_after_with_line_notes (x
, after
, from
)
4245 rtx from_line
= find_line_note (from
);
4246 rtx after_line
= find_line_note (after
);
4247 rtx insn
= emit_insn_after (x
, after
);
4250 emit_line_note_after (NOTE_SOURCE_FILE (from_line
),
4251 NOTE_LINE_NUMBER (from_line
),
4255 emit_line_note_after (NOTE_SOURCE_FILE (after_line
),
4256 NOTE_LINE_NUMBER (after_line
),
4260 /* Make an insn of code JUMP_INSN with body X
4261 and output it after the insn AFTER. */
4264 emit_jump_insn_after (x
, after
)
4269 #ifdef ENABLE_RTL_CHECKING
4270 if (after
== NULL_RTX
)
4274 switch (GET_CODE (x
))
4282 last
= emit_insn_after_1 (x
, after
);
4285 #ifdef ENABLE_RTL_CHECKING
4292 last
= make_jump_insn_raw (x
);
4293 add_insn_after (last
, after
);
4300 /* Make an instruction with body X and code CALL_INSN
4301 and output it after the instruction AFTER. */
4304 emit_call_insn_after (x
, after
)
4309 #ifdef ENABLE_RTL_CHECKING
4310 if (after
== NULL_RTX
)
4314 switch (GET_CODE (x
))
4322 last
= emit_insn_after_1 (x
, after
);
4325 #ifdef ENABLE_RTL_CHECKING
4332 last
= make_call_insn_raw (x
);
4333 add_insn_after (last
, after
);
4340 /* Make an insn of code BARRIER
4341 and output it after the insn AFTER. */
4344 emit_barrier_after (after
)
4347 rtx insn
= rtx_alloc (BARRIER
);
4349 INSN_UID (insn
) = cur_insn_uid
++;
4351 add_insn_after (insn
, after
);
4355 /* Emit the label LABEL after the insn AFTER. */
4358 emit_label_after (label
, after
)
4361 /* This can be called twice for the same label
4362 as a result of the confusion that follows a syntax error!
4363 So make it harmless. */
4364 if (INSN_UID (label
) == 0)
4366 INSN_UID (label
) = cur_insn_uid
++;
4367 add_insn_after (label
, after
);
4373 /* Emit a note of subtype SUBTYPE after the insn AFTER. */
4376 emit_note_after (subtype
, after
)
4380 rtx note
= rtx_alloc (NOTE
);
4381 INSN_UID (note
) = cur_insn_uid
++;
4382 NOTE_SOURCE_FILE (note
) = 0;
4383 NOTE_LINE_NUMBER (note
) = subtype
;
4384 BLOCK_FOR_INSN (note
) = NULL
;
4385 add_insn_after (note
, after
);
4389 /* Emit a line note for FILE and LINE after the insn AFTER. */
4392 emit_line_note_after (file
, line
, after
)
4399 if (no_line_numbers
&& line
> 0)
4405 note
= rtx_alloc (NOTE
);
4406 INSN_UID (note
) = cur_insn_uid
++;
4407 NOTE_SOURCE_FILE (note
) = file
;
4408 NOTE_LINE_NUMBER (note
) = line
;
4409 BLOCK_FOR_INSN (note
) = NULL
;
4410 add_insn_after (note
, after
);
4414 /* Like emit_insn_after, but set INSN_SCOPE according to SCOPE. */
4416 emit_insn_after_scope (pattern
, after
, scope
)
4420 rtx last
= emit_insn_after (pattern
, after
);
4422 after
= NEXT_INSN (after
);
4425 if (active_insn_p (after
))
4426 INSN_SCOPE (after
) = scope
;
4429 after
= NEXT_INSN (after
);
4434 /* Like emit_jump_insn_after, but set INSN_SCOPE according to SCOPE. */
4436 emit_jump_insn_after_scope (pattern
, after
, scope
)
4440 rtx last
= emit_jump_insn_after (pattern
, after
);
4442 after
= NEXT_INSN (after
);
4445 if (active_insn_p (after
))
4446 INSN_SCOPE (after
) = scope
;
4449 after
= NEXT_INSN (after
);
4454 /* Like emit_call_insn_after, but set INSN_SCOPE according to SCOPE. */
4456 emit_call_insn_after_scope (pattern
, after
, scope
)
4460 rtx last
= emit_call_insn_after (pattern
, after
);
4462 after
= NEXT_INSN (after
);
4465 if (active_insn_p (after
))
4466 INSN_SCOPE (after
) = scope
;
4469 after
= NEXT_INSN (after
);
4474 /* Like emit_insn_before, but set INSN_SCOPE according to SCOPE. */
4476 emit_insn_before_scope (pattern
, before
, scope
)
4477 rtx pattern
, before
;
4480 rtx first
= PREV_INSN (before
);
4481 rtx last
= emit_insn_before (pattern
, before
);
4483 first
= NEXT_INSN (first
);
4486 if (active_insn_p (first
))
4487 INSN_SCOPE (first
) = scope
;
4490 first
= NEXT_INSN (first
);
4495 /* Take X and emit it at the end of the doubly-linked
4498 Returns the last insn emitted. */
4504 rtx last
= last_insn
;
4510 switch (GET_CODE (x
))
4521 rtx next
= NEXT_INSN (insn
);
4528 #ifdef ENABLE_RTL_CHECKING
4535 last
= make_insn_raw (x
);
4543 /* Make an insn of code JUMP_INSN with pattern X
4544 and add it to the end of the doubly-linked list. */
4550 rtx last
= NULL_RTX
, insn
;
4552 switch (GET_CODE (x
))
4563 rtx next
= NEXT_INSN (insn
);
4570 #ifdef ENABLE_RTL_CHECKING
4577 last
= make_jump_insn_raw (x
);
4585 /* Make an insn of code CALL_INSN with pattern X
4586 and add it to the end of the doubly-linked list. */
4594 switch (GET_CODE (x
))
4602 insn
= emit_insn (x
);
4605 #ifdef ENABLE_RTL_CHECKING
4612 insn
= make_call_insn_raw (x
);
4620 /* Add the label LABEL to the end of the doubly-linked list. */
4626 /* This can be called twice for the same label
4627 as a result of the confusion that follows a syntax error!
4628 So make it harmless. */
4629 if (INSN_UID (label
) == 0)
4631 INSN_UID (label
) = cur_insn_uid
++;
4637 /* Make an insn of code BARRIER
4638 and add it to the end of the doubly-linked list. */
4643 rtx barrier
= rtx_alloc (BARRIER
);
4644 INSN_UID (barrier
) = cur_insn_uid
++;
4649 /* Make an insn of code NOTE
4650 with data-fields specified by FILE and LINE
4651 and add it to the end of the doubly-linked list,
4652 but only if line-numbers are desired for debugging info. */
4655 emit_line_note (file
, line
)
4659 set_file_and_line_for_stmt (file
, line
);
4662 if (no_line_numbers
)
4666 return emit_note (file
, line
);
4669 /* Make an insn of code NOTE
4670 with data-fields specified by FILE and LINE
4671 and add it to the end of the doubly-linked list.
4672 If it is a line-number NOTE, omit it if it matches the previous one. */
4675 emit_note (file
, line
)
4683 if (file
&& last_filename
&& !strcmp (file
, last_filename
)
4684 && line
== last_linenum
)
4686 last_filename
= file
;
4687 last_linenum
= line
;
4690 if (no_line_numbers
&& line
> 0)
4696 note
= rtx_alloc (NOTE
);
4697 INSN_UID (note
) = cur_insn_uid
++;
4698 NOTE_SOURCE_FILE (note
) = file
;
4699 NOTE_LINE_NUMBER (note
) = line
;
4700 BLOCK_FOR_INSN (note
) = NULL
;
4705 /* Emit a NOTE, and don't omit it even if LINE is the previous note. */
4708 emit_line_note_force (file
, line
)
4713 return emit_line_note (file
, line
);
4716 /* Cause next statement to emit a line note even if the line number
4717 has not changed. This is used at the beginning of a function. */
4720 force_next_line_note ()
4725 /* Place a note of KIND on insn INSN with DATUM as the datum. If a
4726 note of this type already exists, remove it first. */
4729 set_unique_reg_note (insn
, kind
, datum
)
4734 rtx note
= find_reg_note (insn
, kind
, NULL_RTX
);
4740 /* Don't add REG_EQUAL/REG_EQUIV notes if the insn
4741 has multiple sets (some callers assume single_set
4742 means the insn only has one set, when in fact it
4743 means the insn only has one * useful * set). */
4744 if (GET_CODE (PATTERN (insn
)) == PARALLEL
&& multiple_sets (insn
))
4751 /* Don't add ASM_OPERAND REG_EQUAL/REG_EQUIV notes.
4752 It serves no useful purpose and breaks eliminate_regs. */
4753 if (GET_CODE (datum
) == ASM_OPERANDS
)
4763 XEXP (note
, 0) = datum
;
4767 REG_NOTES (insn
) = gen_rtx_EXPR_LIST (kind
, datum
, REG_NOTES (insn
));
4768 return REG_NOTES (insn
);
4771 /* Return an indication of which type of insn should have X as a body.
4772 The value is CODE_LABEL, INSN, CALL_INSN or JUMP_INSN. */
4778 if (GET_CODE (x
) == CODE_LABEL
)
4780 if (GET_CODE (x
) == CALL
)
4782 if (GET_CODE (x
) == RETURN
)
4784 if (GET_CODE (x
) == SET
)
4786 if (SET_DEST (x
) == pc_rtx
)
4788 else if (GET_CODE (SET_SRC (x
)) == CALL
)
4793 if (GET_CODE (x
) == PARALLEL
)
4796 for (j
= XVECLEN (x
, 0) - 1; j
>= 0; j
--)
4797 if (GET_CODE (XVECEXP (x
, 0, j
)) == CALL
)
4799 else if (GET_CODE (XVECEXP (x
, 0, j
)) == SET
4800 && SET_DEST (XVECEXP (x
, 0, j
)) == pc_rtx
)
4802 else if (GET_CODE (XVECEXP (x
, 0, j
)) == SET
4803 && GET_CODE (SET_SRC (XVECEXP (x
, 0, j
))) == CALL
)
4809 /* Emit the rtl pattern X as an appropriate kind of insn.
4810 If X is a label, it is simply added into the insn chain. */
4816 enum rtx_code code
= classify_insn (x
);
4818 if (code
== CODE_LABEL
)
4819 return emit_label (x
);
4820 else if (code
== INSN
)
4821 return emit_insn (x
);
4822 else if (code
== JUMP_INSN
)
4824 rtx insn
= emit_jump_insn (x
);
4825 if (any_uncondjump_p (insn
) || GET_CODE (x
) == RETURN
)
4826 return emit_barrier ();
4829 else if (code
== CALL_INSN
)
4830 return emit_call_insn (x
);
4835 /* Space for free sequence stack entries. */
4836 static GTY ((deletable (""))) struct sequence_stack
*free_sequence_stack
;
4838 /* Begin emitting insns to a sequence which can be packaged in an
4839 RTL_EXPR. If this sequence will contain something that might cause
4840 the compiler to pop arguments to function calls (because those
4841 pops have previously been deferred; see INHIBIT_DEFER_POP for more
4842 details), use do_pending_stack_adjust before calling this function.
4843 That will ensure that the deferred pops are not accidentally
4844 emitted in the middle of this sequence. */
4849 struct sequence_stack
*tem
;
4851 if (free_sequence_stack
!= NULL
)
4853 tem
= free_sequence_stack
;
4854 free_sequence_stack
= tem
->next
;
4857 tem
= (struct sequence_stack
*) ggc_alloc (sizeof (struct sequence_stack
));
4859 tem
->next
= seq_stack
;
4860 tem
->first
= first_insn
;
4861 tem
->last
= last_insn
;
4862 tem
->sequence_rtl_expr
= seq_rtl_expr
;
4870 /* Similarly, but indicate that this sequence will be placed in T, an
4871 RTL_EXPR. See the documentation for start_sequence for more
4872 information about how to use this function. */
4875 start_sequence_for_rtl_expr (t
)
4883 /* Set up the insn chain starting with FIRST as the current sequence,
4884 saving the previously current one. See the documentation for
4885 start_sequence for more information about how to use this function. */
4888 push_to_sequence (first
)
4895 for (last
= first
; last
&& NEXT_INSN (last
); last
= NEXT_INSN (last
));
4901 /* Set up the insn chain from a chain stort in FIRST to LAST. */
4904 push_to_full_sequence (first
, last
)
4910 /* We really should have the end of the insn chain here. */
4911 if (last
&& NEXT_INSN (last
))
4915 /* Set up the outer-level insn chain
4916 as the current sequence, saving the previously current one. */
4919 push_topmost_sequence ()
4921 struct sequence_stack
*stack
, *top
= NULL
;
4925 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
4928 first_insn
= top
->first
;
4929 last_insn
= top
->last
;
4930 seq_rtl_expr
= top
->sequence_rtl_expr
;
4933 /* After emitting to the outer-level insn chain, update the outer-level
4934 insn chain, and restore the previous saved state. */
4937 pop_topmost_sequence ()
4939 struct sequence_stack
*stack
, *top
= NULL
;
4941 for (stack
= seq_stack
; stack
; stack
= stack
->next
)
4944 top
->first
= first_insn
;
4945 top
->last
= last_insn
;
4946 /* ??? Why don't we save seq_rtl_expr here? */
4951 /* After emitting to a sequence, restore previous saved state.
4953 To get the contents of the sequence just made, you must call
4954 `get_insns' *before* calling here.
4956 If the compiler might have deferred popping arguments while
4957 generating this sequence, and this sequence will not be immediately
4958 inserted into the instruction stream, use do_pending_stack_adjust
4959 before calling get_insns. That will ensure that the deferred
4960 pops are inserted into this sequence, and not into some random
4961 location in the instruction stream. See INHIBIT_DEFER_POP for more
4962 information about deferred popping of arguments. */
4967 struct sequence_stack
*tem
= seq_stack
;
4969 first_insn
= tem
->first
;
4970 last_insn
= tem
->last
;
4971 seq_rtl_expr
= tem
->sequence_rtl_expr
;
4972 seq_stack
= tem
->next
;
4974 memset (tem
, 0, sizeof (*tem
));
4975 tem
->next
= free_sequence_stack
;
4976 free_sequence_stack
= tem
;
4979 /* This works like end_sequence, but records the old sequence in FIRST
4983 end_full_sequence (first
, last
)
4986 *first
= first_insn
;
4991 /* Return 1 if currently emitting into a sequence. */
4996 return seq_stack
!= 0;
4999 /* Put the various virtual registers into REGNO_REG_RTX. */
5002 init_virtual_regs (es
)
5003 struct emit_status
*es
;
5005 rtx
*ptr
= es
->x_regno_reg_rtx
;
5006 ptr
[VIRTUAL_INCOMING_ARGS_REGNUM
] = virtual_incoming_args_rtx
;
5007 ptr
[VIRTUAL_STACK_VARS_REGNUM
] = virtual_stack_vars_rtx
;
5008 ptr
[VIRTUAL_STACK_DYNAMIC_REGNUM
] = virtual_stack_dynamic_rtx
;
5009 ptr
[VIRTUAL_OUTGOING_ARGS_REGNUM
] = virtual_outgoing_args_rtx
;
5010 ptr
[VIRTUAL_CFA_REGNUM
] = virtual_cfa_rtx
;
5014 /* Used by copy_insn_1 to avoid copying SCRATCHes more than once. */
5015 static rtx copy_insn_scratch_in
[MAX_RECOG_OPERANDS
];
5016 static rtx copy_insn_scratch_out
[MAX_RECOG_OPERANDS
];
5017 static int copy_insn_n_scratches
;
5019 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5020 copied an ASM_OPERANDS.
5021 In that case, it is the original input-operand vector. */
5022 static rtvec orig_asm_operands_vector
;
5024 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
5025 copied an ASM_OPERANDS.
5026 In that case, it is the copied input-operand vector. */
5027 static rtvec copy_asm_operands_vector
;
5029 /* Likewise for the constraints vector. */
5030 static rtvec orig_asm_constraints_vector
;
5031 static rtvec copy_asm_constraints_vector
;
5033 /* Recursively create a new copy of an rtx for copy_insn.
5034 This function differs from copy_rtx in that it handles SCRATCHes and
5035 ASM_OPERANDs properly.
5036 Normally, this function is not used directly; use copy_insn as front end.
5037 However, you could first copy an insn pattern with copy_insn and then use
5038 this function afterwards to properly copy any REG_NOTEs containing
5048 const char *format_ptr
;
5050 code
= GET_CODE (orig
);
5067 for (i
= 0; i
< copy_insn_n_scratches
; i
++)
5068 if (copy_insn_scratch_in
[i
] == orig
)
5069 return copy_insn_scratch_out
[i
];
5073 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
5074 a LABEL_REF, it isn't sharable. */
5075 if (GET_CODE (XEXP (orig
, 0)) == PLUS
5076 && GET_CODE (XEXP (XEXP (orig
, 0), 0)) == SYMBOL_REF
5077 && GET_CODE (XEXP (XEXP (orig
, 0), 1)) == CONST_INT
)
5081 /* A MEM with a constant address is not sharable. The problem is that
5082 the constant address may need to be reloaded. If the mem is shared,
5083 then reloading one copy of this mem will cause all copies to appear
5084 to have been reloaded. */
5090 copy
= rtx_alloc (code
);
5092 /* Copy the various flags, and other information. We assume that
5093 all fields need copying, and then clear the fields that should
5094 not be copied. That is the sensible default behavior, and forces
5095 us to explicitly document why we are *not* copying a flag. */
5096 memcpy (copy
, orig
, sizeof (struct rtx_def
) - sizeof (rtunion
));
5098 /* We do not copy the USED flag, which is used as a mark bit during
5099 walks over the RTL. */
5100 RTX_FLAG (copy
, used
) = 0;
5102 /* We do not copy JUMP, CALL, or FRAME_RELATED for INSNs. */
5103 if (GET_RTX_CLASS (code
) == 'i')
5105 RTX_FLAG (copy
, jump
) = 0;
5106 RTX_FLAG (copy
, call
) = 0;
5107 RTX_FLAG (copy
, frame_related
) = 0;
5110 format_ptr
= GET_RTX_FORMAT (GET_CODE (copy
));
5112 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (copy
)); i
++)
5114 copy
->fld
[i
] = orig
->fld
[i
];
5115 switch (*format_ptr
++)
5118 if (XEXP (orig
, i
) != NULL
)
5119 XEXP (copy
, i
) = copy_insn_1 (XEXP (orig
, i
));
5124 if (XVEC (orig
, i
) == orig_asm_constraints_vector
)
5125 XVEC (copy
, i
) = copy_asm_constraints_vector
;
5126 else if (XVEC (orig
, i
) == orig_asm_operands_vector
)
5127 XVEC (copy
, i
) = copy_asm_operands_vector
;
5128 else if (XVEC (orig
, i
) != NULL
)
5130 XVEC (copy
, i
) = rtvec_alloc (XVECLEN (orig
, i
));
5131 for (j
= 0; j
< XVECLEN (copy
, i
); j
++)
5132 XVECEXP (copy
, i
, j
) = copy_insn_1 (XVECEXP (orig
, i
, j
));
5143 /* These are left unchanged. */
5151 if (code
== SCRATCH
)
5153 i
= copy_insn_n_scratches
++;
5154 if (i
>= MAX_RECOG_OPERANDS
)
5156 copy_insn_scratch_in
[i
] = orig
;
5157 copy_insn_scratch_out
[i
] = copy
;
5159 else if (code
== ASM_OPERANDS
)
5161 orig_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (orig
);
5162 copy_asm_operands_vector
= ASM_OPERANDS_INPUT_VEC (copy
);
5163 orig_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (orig
);
5164 copy_asm_constraints_vector
= ASM_OPERANDS_INPUT_CONSTRAINT_VEC (copy
);
5170 /* Create a new copy of an rtx.
5171 This function differs from copy_rtx in that it handles SCRATCHes and
5172 ASM_OPERANDs properly.
5173 INSN doesn't really have to be a full INSN; it could be just the
5179 copy_insn_n_scratches
= 0;
5180 orig_asm_operands_vector
= 0;
5181 orig_asm_constraints_vector
= 0;
5182 copy_asm_operands_vector
= 0;
5183 copy_asm_constraints_vector
= 0;
5184 return copy_insn_1 (insn
);
5187 /* Initialize data structures and variables in this file
5188 before generating rtl for each function. */
5193 struct function
*f
= cfun
;
5195 f
->emit
= (struct emit_status
*) ggc_alloc (sizeof (struct emit_status
));
5198 seq_rtl_expr
= NULL
;
5200 reg_rtx_no
= LAST_VIRTUAL_REGISTER
+ 1;
5203 first_label_num
= label_num
;
5207 /* Init the tables that describe all the pseudo regs. */
5209 f
->emit
->regno_pointer_align_length
= LAST_VIRTUAL_REGISTER
+ 101;
5211 f
->emit
->regno_pointer_align
5212 = (unsigned char *) ggc_alloc_cleared (f
->emit
->regno_pointer_align_length
5213 * sizeof (unsigned char));
5216 = (rtx
*) ggc_alloc_cleared (f
->emit
->regno_pointer_align_length
5220 = (tree
*) ggc_alloc_cleared (f
->emit
->regno_pointer_align_length
5223 /* Put copies of all the hard registers into regno_reg_rtx. */
5224 memcpy (regno_reg_rtx
,
5225 static_regno_reg_rtx
,
5226 FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
5228 /* Put copies of all the virtual register rtx into regno_reg_rtx. */
5229 init_virtual_regs (f
->emit
);
5231 /* Indicate that the virtual registers and stack locations are
5233 REG_POINTER (stack_pointer_rtx
) = 1;
5234 REG_POINTER (frame_pointer_rtx
) = 1;
5235 REG_POINTER (hard_frame_pointer_rtx
) = 1;
5236 REG_POINTER (arg_pointer_rtx
) = 1;
5238 REG_POINTER (virtual_incoming_args_rtx
) = 1;
5239 REG_POINTER (virtual_stack_vars_rtx
) = 1;
5240 REG_POINTER (virtual_stack_dynamic_rtx
) = 1;
5241 REG_POINTER (virtual_outgoing_args_rtx
) = 1;
5242 REG_POINTER (virtual_cfa_rtx
) = 1;
5244 #ifdef STACK_BOUNDARY
5245 REGNO_POINTER_ALIGN (STACK_POINTER_REGNUM
) = STACK_BOUNDARY
;
5246 REGNO_POINTER_ALIGN (FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5247 REGNO_POINTER_ALIGN (HARD_FRAME_POINTER_REGNUM
) = STACK_BOUNDARY
;
5248 REGNO_POINTER_ALIGN (ARG_POINTER_REGNUM
) = STACK_BOUNDARY
;
5250 REGNO_POINTER_ALIGN (VIRTUAL_INCOMING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5251 REGNO_POINTER_ALIGN (VIRTUAL_STACK_VARS_REGNUM
) = STACK_BOUNDARY
;
5252 REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM
) = STACK_BOUNDARY
;
5253 REGNO_POINTER_ALIGN (VIRTUAL_OUTGOING_ARGS_REGNUM
) = STACK_BOUNDARY
;
5254 REGNO_POINTER_ALIGN (VIRTUAL_CFA_REGNUM
) = BITS_PER_WORD
;
5257 #ifdef INIT_EXPANDERS
5262 /* Generate the constant 0. */
5265 gen_const_vector_0 (mode
)
5266 enum machine_mode mode
;
5271 enum machine_mode inner
;
5273 units
= GET_MODE_NUNITS (mode
);
5274 inner
= GET_MODE_INNER (mode
);
5276 v
= rtvec_alloc (units
);
5278 /* We need to call this function after we to set CONST0_RTX first. */
5279 if (!CONST0_RTX (inner
))
5282 for (i
= 0; i
< units
; ++i
)
5283 RTVEC_ELT (v
, i
) = CONST0_RTX (inner
);
5285 tem
= gen_rtx_raw_CONST_VECTOR (mode
, v
);
5289 /* Generate a vector like gen_rtx_raw_CONST_VEC, but use the zero vector when
5290 all elements are zero. */
5292 gen_rtx_CONST_VECTOR (mode
, v
)
5293 enum machine_mode mode
;
5296 rtx inner_zero
= CONST0_RTX (GET_MODE_INNER (mode
));
5299 for (i
= GET_MODE_NUNITS (mode
) - 1; i
>= 0; i
--)
5300 if (RTVEC_ELT (v
, i
) != inner_zero
)
5301 return gen_rtx_raw_CONST_VECTOR (mode
, v
);
5302 return CONST0_RTX (mode
);
5305 /* Create some permanent unique rtl objects shared between all functions.
5306 LINE_NUMBERS is nonzero if line numbers are to be generated. */
5309 init_emit_once (line_numbers
)
5313 enum machine_mode mode
;
5314 enum machine_mode double_mode
;
5316 /* Initialize the CONST_INT, CONST_DOUBLE, and memory attribute hash
5318 const_int_htab
= htab_create_ggc (37, const_int_htab_hash
,
5319 const_int_htab_eq
, NULL
);
5321 const_double_htab
= htab_create_ggc (37, const_double_htab_hash
,
5322 const_double_htab_eq
, NULL
);
5324 mem_attrs_htab
= htab_create_ggc (37, mem_attrs_htab_hash
,
5325 mem_attrs_htab_eq
, NULL
);
5327 no_line_numbers
= ! line_numbers
;
5329 /* Compute the word and byte modes. */
5331 byte_mode
= VOIDmode
;
5332 word_mode
= VOIDmode
;
5333 double_mode
= VOIDmode
;
5335 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
); mode
!= VOIDmode
;
5336 mode
= GET_MODE_WIDER_MODE (mode
))
5338 if (GET_MODE_BITSIZE (mode
) == BITS_PER_UNIT
5339 && byte_mode
== VOIDmode
)
5342 if (GET_MODE_BITSIZE (mode
) == BITS_PER_WORD
5343 && word_mode
== VOIDmode
)
5347 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
5348 mode
= GET_MODE_WIDER_MODE (mode
))
5350 if (GET_MODE_BITSIZE (mode
) == DOUBLE_TYPE_SIZE
5351 && double_mode
== VOIDmode
)
5355 ptr_mode
= mode_for_size (POINTER_SIZE
, GET_MODE_CLASS (Pmode
), 0);
5357 /* Assign register numbers to the globally defined register rtx.
5358 This must be done at runtime because the register number field
5359 is in a union and some compilers can't initialize unions. */
5361 pc_rtx
= gen_rtx (PC
, VOIDmode
);
5362 cc0_rtx
= gen_rtx (CC0
, VOIDmode
);
5363 stack_pointer_rtx
= gen_raw_REG (Pmode
, STACK_POINTER_REGNUM
);
5364 frame_pointer_rtx
= gen_raw_REG (Pmode
, FRAME_POINTER_REGNUM
);
5365 if (hard_frame_pointer_rtx
== 0)
5366 hard_frame_pointer_rtx
= gen_raw_REG (Pmode
,
5367 HARD_FRAME_POINTER_REGNUM
);
5368 if (arg_pointer_rtx
== 0)
5369 arg_pointer_rtx
= gen_raw_REG (Pmode
, ARG_POINTER_REGNUM
);
5370 virtual_incoming_args_rtx
=
5371 gen_raw_REG (Pmode
, VIRTUAL_INCOMING_ARGS_REGNUM
);
5372 virtual_stack_vars_rtx
=
5373 gen_raw_REG (Pmode
, VIRTUAL_STACK_VARS_REGNUM
);
5374 virtual_stack_dynamic_rtx
=
5375 gen_raw_REG (Pmode
, VIRTUAL_STACK_DYNAMIC_REGNUM
);
5376 virtual_outgoing_args_rtx
=
5377 gen_raw_REG (Pmode
, VIRTUAL_OUTGOING_ARGS_REGNUM
);
5378 virtual_cfa_rtx
= gen_raw_REG (Pmode
, VIRTUAL_CFA_REGNUM
);
5380 /* Initialize RTL for commonly used hard registers. These are
5381 copied into regno_reg_rtx as we begin to compile each function. */
5382 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
5383 static_regno_reg_rtx
[i
] = gen_raw_REG (reg_raw_mode
[i
], i
);
5385 #ifdef INIT_EXPANDERS
5386 /* This is to initialize {init|mark|free}_machine_status before the first
5387 call to push_function_context_to. This is needed by the Chill front
5388 end which calls push_function_context_to before the first call to
5389 init_function_start. */
5393 /* Create the unique rtx's for certain rtx codes and operand values. */
5395 /* Don't use gen_rtx here since gen_rtx in this case
5396 tries to use these variables. */
5397 for (i
= - MAX_SAVED_CONST_INT
; i
<= MAX_SAVED_CONST_INT
; i
++)
5398 const_int_rtx
[i
+ MAX_SAVED_CONST_INT
] =
5399 gen_rtx_raw_CONST_INT (VOIDmode
, (HOST_WIDE_INT
) i
);
5401 if (STORE_FLAG_VALUE
>= - MAX_SAVED_CONST_INT
5402 && STORE_FLAG_VALUE
<= MAX_SAVED_CONST_INT
)
5403 const_true_rtx
= const_int_rtx
[STORE_FLAG_VALUE
+ MAX_SAVED_CONST_INT
];
5405 const_true_rtx
= gen_rtx_CONST_INT (VOIDmode
, STORE_FLAG_VALUE
);
5407 REAL_VALUE_FROM_INT (dconst0
, 0, 0, double_mode
);
5408 REAL_VALUE_FROM_INT (dconst1
, 1, 0, double_mode
);
5409 REAL_VALUE_FROM_INT (dconst2
, 2, 0, double_mode
);
5410 REAL_VALUE_FROM_INT (dconstm1
, -1, -1, double_mode
);
5412 for (i
= 0; i
<= 2; i
++)
5414 REAL_VALUE_TYPE
*r
=
5415 (i
== 0 ? &dconst0
: i
== 1 ? &dconst1
: &dconst2
);
5417 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
); mode
!= VOIDmode
;
5418 mode
= GET_MODE_WIDER_MODE (mode
))
5419 const_tiny_rtx
[i
][(int) mode
] =
5420 CONST_DOUBLE_FROM_REAL_VALUE (*r
, mode
);
5422 const_tiny_rtx
[i
][(int) VOIDmode
] = GEN_INT (i
);
5424 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
); mode
!= VOIDmode
;
5425 mode
= GET_MODE_WIDER_MODE (mode
))
5426 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5428 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_PARTIAL_INT
);
5430 mode
= GET_MODE_WIDER_MODE (mode
))
5431 const_tiny_rtx
[i
][(int) mode
] = GEN_INT (i
);
5434 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
5436 mode
= GET_MODE_WIDER_MODE (mode
))
5437 const_tiny_rtx
[0][(int) mode
] = gen_const_vector_0 (mode
);
5439 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
5441 mode
= GET_MODE_WIDER_MODE (mode
))
5442 const_tiny_rtx
[0][(int) mode
] = gen_const_vector_0 (mode
);
5444 for (i
= (int) CCmode
; i
< (int) MAX_MACHINE_MODE
; ++i
)
5445 if (GET_MODE_CLASS ((enum machine_mode
) i
) == MODE_CC
)
5446 const_tiny_rtx
[0][i
] = const0_rtx
;
5448 const_tiny_rtx
[0][(int) BImode
] = const0_rtx
;
5449 if (STORE_FLAG_VALUE
== 1)
5450 const_tiny_rtx
[1][(int) BImode
] = const1_rtx
;
5452 #ifdef RETURN_ADDRESS_POINTER_REGNUM
5453 return_address_pointer_rtx
5454 = gen_raw_REG (Pmode
, RETURN_ADDRESS_POINTER_REGNUM
);
5458 struct_value_rtx
= STRUCT_VALUE
;
5460 struct_value_rtx
= gen_rtx_REG (Pmode
, STRUCT_VALUE_REGNUM
);
5463 #ifdef STRUCT_VALUE_INCOMING
5464 struct_value_incoming_rtx
= STRUCT_VALUE_INCOMING
;
5466 #ifdef STRUCT_VALUE_INCOMING_REGNUM
5467 struct_value_incoming_rtx
5468 = gen_rtx_REG (Pmode
, STRUCT_VALUE_INCOMING_REGNUM
);
5470 struct_value_incoming_rtx
= struct_value_rtx
;
5474 #ifdef STATIC_CHAIN_REGNUM
5475 static_chain_rtx
= gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
5477 #ifdef STATIC_CHAIN_INCOMING_REGNUM
5478 if (STATIC_CHAIN_INCOMING_REGNUM
!= STATIC_CHAIN_REGNUM
)
5479 static_chain_incoming_rtx
5480 = gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
5483 static_chain_incoming_rtx
= static_chain_rtx
;
5487 static_chain_rtx
= STATIC_CHAIN
;
5489 #ifdef STATIC_CHAIN_INCOMING
5490 static_chain_incoming_rtx
= STATIC_CHAIN_INCOMING
;
5492 static_chain_incoming_rtx
= static_chain_rtx
;
5496 if ((unsigned) PIC_OFFSET_TABLE_REGNUM
!= INVALID_REGNUM
)
5497 pic_offset_table_rtx
= gen_raw_REG (Pmode
, PIC_OFFSET_TABLE_REGNUM
);
5500 /* Query and clear/ restore no_line_numbers. This is used by the
5501 switch / case handling in stmt.c to give proper line numbers in
5502 warnings about unreachable code. */
5505 force_line_numbers ()
5507 int old
= no_line_numbers
;
5509 no_line_numbers
= 0;
5511 force_next_line_note ();
5516 restore_line_number_status (old_value
)
5519 no_line_numbers
= old_value
;
5522 /* Produce exact duplicate of insn INSN after AFTER.
5523 Care updating of libcall regions if present. */
5526 emit_copy_of_insn_after (insn
, after
)
5530 rtx note1
, note2
, link
;
5532 switch (GET_CODE (insn
))
5535 new = emit_insn_after (copy_insn (PATTERN (insn
)), after
);
5539 new = emit_jump_insn_after (copy_insn (PATTERN (insn
)), after
);
5543 new = emit_call_insn_after (copy_insn (PATTERN (insn
)), after
);
5544 if (CALL_INSN_FUNCTION_USAGE (insn
))
5545 CALL_INSN_FUNCTION_USAGE (new)
5546 = copy_insn (CALL_INSN_FUNCTION_USAGE (insn
));
5547 SIBLING_CALL_P (new) = SIBLING_CALL_P (insn
);
5548 CONST_OR_PURE_CALL_P (new) = CONST_OR_PURE_CALL_P (insn
);
5555 /* Update LABEL_NUSES. */
5556 mark_jump_label (PATTERN (new), new, 0);
5558 INSN_SCOPE (new) = INSN_SCOPE (insn
);
5560 /* Copy all REG_NOTES except REG_LABEL since mark_jump_label will
5562 for (link
= REG_NOTES (insn
); link
; link
= XEXP (link
, 1))
5563 if (REG_NOTE_KIND (link
) != REG_LABEL
)
5565 if (GET_CODE (link
) == EXPR_LIST
)
5567 = copy_insn_1 (gen_rtx_EXPR_LIST (REG_NOTE_KIND (link
),
5572 = copy_insn_1 (gen_rtx_INSN_LIST (REG_NOTE_KIND (link
),
5577 /* Fix the libcall sequences. */
5578 if ((note1
= find_reg_note (new, REG_RETVAL
, NULL_RTX
)) != NULL
)
5581 while ((note2
= find_reg_note (p
, REG_LIBCALL
, NULL_RTX
)) == NULL
)
5583 XEXP (note1
, 0) = p
;
5584 XEXP (note2
, 0) = new;
5589 #include "gt-emit-rtl.h"