1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
29 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
30 #undef FLOAT /* Likewise. */
31 #undef ABS /* Likewise. */
32 #undef PC /* Likewise. */
38 /* Register Transfer Language EXPRESSIONS CODES */
40 #define RTX_CODE enum rtx_code
43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
44 #include "rtl.def" /* rtl expressions are documented here */
47 LAST_AND_UNUSED_RTX_CODE
}; /* A convenient way to get a value for
49 Assumes default enum value assignment. */
51 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
54 extern const int rtx_length
[];
55 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
57 extern const char * const rtx_name
[];
58 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
60 extern const char * const rtx_format
[];
61 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
63 extern const char rtx_class
[];
64 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
66 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
67 relative to which the offsets are calculated, as explained in rtl.def. */
70 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
71 unsigned min_align
: 8;
73 unsigned base_after_vec
: 1; /* BASE is after the ADDR_DIFF_VEC. */
74 unsigned min_after_vec
: 1; /* minimum address target label is after the ADDR_DIFF_VEC. */
75 unsigned max_after_vec
: 1; /* maximum address target label is after the ADDR_DIFF_VEC. */
76 unsigned min_after_base
: 1; /* minimum address target label is after BASE. */
77 unsigned max_after_base
: 1; /* maximum address target label is after BASE. */
78 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
79 unsigned offset_unsigned
: 1; /* offsets have to be treated as unsigned. */
82 } addr_diff_vec_flags
;
84 /* Common union for an element of an rtx. */
86 typedef union rtunion_def
93 struct rtvec_def
*rtvec
;
94 enum machine_mode rttype
;
95 addr_diff_vec_flags rt_addr_diff_vec_flags
;
96 struct cselib_val_struct
*rt_cselib
;
97 struct bitmap_head_def
*rtbit
;
98 union tree_node
*rttree
;
99 struct basic_block_def
*bb
;
102 /* RTL expression ("rtx"). */
104 typedef struct rtx_def
106 /* The kind of expression this is. */
107 ENUM_BITFIELD(rtx_code
) code
: 16;
109 /* The kind of value the expression has. */
110 ENUM_BITFIELD(machine_mode
) mode
: 8;
112 /* 1 in an INSN if it can alter flow of control
113 within this function.
114 LINK_COST_ZERO in an INSN_LIST. */
115 unsigned int jump
: 1;
116 /* 1 in an INSN if it can call another function.
117 LINK_COST_FREE in an INSN_LIST. */
118 unsigned int call
: 1;
119 /* 1 in a MEM or REG if value of this expression will never change
120 during the current function, even though it is not
122 1 in a SUBREG if it is from a promoted variable that is unsigned.
123 1 in a SYMBOL_REF if it addresses something in the per-function
125 1 in a CALL_INSN if it is a const call.
126 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
127 reorg until end of compilation; cleared before used. */
128 unsigned int unchanging
: 1;
129 /* 1 in a MEM expression if contents of memory are volatile.
130 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
132 1 in a REG expression if corresponds to a variable declared by the user.
133 0 for an internally generated temporary.
134 In a SYMBOL_REF, this flag is used for machine-specific purposes.
135 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
136 unsigned int volatil
: 1;
137 /* 1 in a MEM referring to a field of an aggregate.
138 0 if the MEM was a variable or the result of a * operator in C;
139 1 if it was the result of a . or -> operator (on a struct) in C.
140 1 in a REG if the register is used only in exit code a loop.
141 1 in a SUBREG expression if was generated from a variable with a
143 1 in a CODE_LABEL if the label is used for nonlocal gotos
144 and must not be deleted even if its count is zero.
145 1 in a LABEL_REF if this is a reference to a label outside the
147 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
148 together with the preceding insn. Valid only within sched.
149 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
150 from the target of a branch. Valid from reorg until end of compilation;
151 cleared before used. */
152 unsigned int in_struct
: 1;
153 /* 1 if this rtx is used. This is used for copying shared structure.
154 See `unshare_all_rtl'.
155 In a REG, this is not needed for that purpose, and used instead
156 in `leaf_renumber_regs_insn'.
157 In a SYMBOL_REF, means that emit_library_call
158 has used it as the function. */
159 unsigned int used
: 1;
160 /* Nonzero if this rtx came from procedure integration.
161 In a REG, nonzero means this reg refers to the return value
162 of the current function. */
163 unsigned integrated
: 1;
164 /* 1 in an INSN or a SET if this rtx is related to the call frame,
165 either changing how we compute the frame address or saving and
166 restoring registers in the prologue and epilogue.
167 1 in a MEM if the MEM refers to a scalar, rather than a member of
169 unsigned frame_related
: 1;
171 /* The first element of the operands of this rtx.
172 The number of operands and their types are controlled
173 by the `code' field, according to rtl.def. */
177 #define NULL_RTX (rtx) 0
179 /* Define macros to access the `code' field of the rtx. */
181 #define GET_CODE(RTX) ((RTX)->code)
182 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
184 #define GET_MODE(RTX) ((RTX)->mode)
185 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
187 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
188 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
189 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
191 /* RTL vector. These appear inside RTX's when there is a need
192 for a variable number of things. The principle use is inside
193 PARALLEL expressions. */
195 typedef struct rtvec_def
{
196 int num_elem
; /* number of elements */
197 struct rtx_def
*elem
[1];
200 #define NULL_RTVEC (rtvec) 0
202 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
203 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
205 /* 1 if X is a REG. */
207 #define REG_P(X) (GET_CODE (X) == REG)
209 /* 1 if X is a constant value that is an integer. */
211 #define CONSTANT_P(X) \
212 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
213 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
214 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
215 || GET_CODE (X) == CONSTANT_P_RTX)
217 /* General accessor macros for accessing the fields of an rtx. */
219 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
220 /* The bit with a star outside the statement expr and an & inside is
221 so that N can be evaluated only once. */
222 #define RTL_CHECK1(RTX, N, C1) __extension__ \
223 (*({ rtx _rtx = (RTX); int _n = (N); \
224 enum rtx_code _code = GET_CODE (_rtx); \
225 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
226 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
227 if (GET_RTX_FORMAT(_code)[_n] != C1) \
228 rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
231 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
232 (*({ rtx _rtx = (RTX); int _n = (N); \
233 enum rtx_code _code = GET_CODE (_rtx); \
234 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
235 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
236 if (GET_RTX_FORMAT(_code)[_n] != C1 \
237 && GET_RTX_FORMAT(_code)[_n] != C2) \
238 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
242 #define RTL_CHECKC1(RTX, N, C) __extension__ \
243 (*({ rtx _rtx = (RTX); int _n = (N); \
244 if (GET_CODE (_rtx) != C) \
245 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
248 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
249 (*({ rtx _rtx = (RTX); int _n = (N); \
250 enum rtx_code _code = GET_CODE (_rtx); \
251 if (_code != C1 && _code != C2) \
252 rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
255 #define RTVEC_ELT(RTVEC, I) __extension__ \
256 (*({ rtvec _rtvec = (RTVEC); int _i = (I); \
257 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
258 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
260 &_rtvec->elem[_i]; }))
262 extern void rtl_check_failed_bounds
PARAMS ((rtx
, int,
263 const char *, int, const char *))
265 extern void rtl_check_failed_type1
PARAMS ((rtx
, int, int,
266 const char *, int, const char *))
268 extern void rtl_check_failed_type2
PARAMS ((rtx
, int, int, int,
269 const char *, int, const char *))
271 extern void rtl_check_failed_code1
PARAMS ((rtx
, enum rtx_code
,
272 const char *, int, const char *))
274 extern void rtl_check_failed_code2
PARAMS ((rtx
, enum rtx_code
, enum rtx_code
,
275 const char *, int, const char *))
277 extern void rtvec_check_failed_bounds
PARAMS ((rtvec
, int,
278 const char *, int, const char *))
281 #else /* not ENABLE_RTL_CHECKING */
283 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
284 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
285 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
286 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
287 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
291 #define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
292 #define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
293 #define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
294 #define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
295 #define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
296 #define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
297 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
298 #define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
299 #define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
301 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
302 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
304 /* These are like XWINT, etc. except that they expect a '0' field instead
305 of the normal type code. */
307 #define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
308 #define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
309 #define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
310 #define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
311 #define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
312 #define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
313 #define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
314 #define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
315 #define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
316 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
317 #define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
319 #define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
320 #define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
321 #define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
322 #define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
323 #define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
324 #define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
325 #define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
326 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
327 #define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
328 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
329 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
330 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
332 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
333 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
335 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
337 /* ACCESS MACROS for particular fields of insns. */
339 /* Determines whether X is an insn. */
340 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
342 /* Holds a unique number for each insn.
343 These are not necessarily sequentially increasing. */
344 #define INSN_UID(INSN) XINT(INSN, 0)
346 /* Chain insns together in sequence. */
347 #define PREV_INSN(INSN) XEXP(INSN, 1)
348 #define NEXT_INSN(INSN) XEXP(INSN, 2)
350 /* The body of an insn. */
351 #define PATTERN(INSN) XEXP(INSN, 3)
353 /* Code number of instruction, from when it was recognized.
354 -1 means this instruction has not been recognized yet. */
355 #define INSN_CODE(INSN) XINT(INSN, 4)
357 /* Set up in flow.c; empty before then.
358 Holds a chain of INSN_LIST rtx's whose first operands point at
359 previous insns with direct data-flow connections to this one.
360 That means that those insns set variables whose next use is in this insn.
361 They are always in the same basic block as this insn. */
362 #define LOG_LINKS(INSN) XEXP(INSN, 5)
364 /* 1 if insn has been deleted. */
365 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
367 /* 1 if insn is a call to a const function. */
368 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
370 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
371 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
373 /* 1 if insn is a branch that should not unconditionally execute its
374 delay slots, i.e., it is an annulled branch. */
375 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
377 /* 1 if insn is in a delay slot and is from the target of the branch. If
378 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
379 executed if the branch is taken. For annulled branches with this bit
380 clear, the insn should be executed only if the branch is not taken. */
381 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
383 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
385 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
387 /* Holds a list of notes on what this insn does to various REGs.
388 It is a chain of EXPR_LIST rtx's, where the second operand is the
389 chain pointer and the first operand is the REG being described.
390 The mode field of the EXPR_LIST contains not a real machine mode
391 but a value from enum reg_note. */
393 #define REG_NOTES(INSN) XEXP(INSN, 6)
395 /* Don't forget to change reg_note_name in rtl.c. */
398 /* The value in REG dies in this insn (i.e., it is not needed past
399 this insn). If REG is set in this insn, the REG_DEAD note may,
400 but need not, be omitted. */
403 /* The REG is autoincremented or autodecremented. */
406 /* Describes the insn as a whole; it says that the insn sets a register
407 to a constant value or to be equivalent to a memory address. If the
408 register is spilled to the stack then the constant value should be
409 substituted for it. The contents of the REG_EQUIV is the constant
410 value or memory address, which may be different from the source of
411 the SET although it has the same value. A REG_EQUIV note may also
412 appear on an insn which copies a register parameter to a pseudo-register,
413 if there is a memory address which could be used to hold that
414 pseudo-register throughout the function. */
417 /* Like REG_EQUIV except that the destination is only momentarily equal
418 to the specified rtx. Therefore, it cannot be used for substitution;
419 but it can be used for cse. */
422 /* The register set in this insn held 0 before the insn. The contents of
423 the note is the insn that stored the 0. If that insn is deleted or
424 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
425 is actually an INSN_LIST, not an EXPR_LIST. */
428 /* This insn copies the return-value of a library call out of the hard reg
429 for return values. This note is actually an INSN_LIST and it points to
430 the first insn involved in setting up arguments for the call. flow.c
431 uses this to delete the entire library call when its result is dead. */
434 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
435 and points at the one that has the REG_RETVAL. This note is also an
439 /* The register is always nonnegative during the containing loop. This is
440 used in branches so that decrement and branch instructions terminating
441 on zero can be matched. There must be an insn pattern in the md file
442 named `decrement_and_branch_until_zero' or else this will never be added
443 to any instructions. */
446 /* There is no conflict *after this insn* between the register in the note
447 and the destination of this insn. */
450 /* Identifies a register set in this insn and never used. */
453 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
454 respectively. Normally, these are required to be consecutive insns, but
455 we permit putting a cc0-setting insn in the delay slot of a branch as
456 long as only one copy of the insn exists. In that case, these notes
457 point from one to the other to allow code generation to determine what
458 any require information and to properly update CC_STATUS. These notes
460 REG_CC_SETTER
, REG_CC_USER
,
462 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
463 CODE_LABEL contained in the REG_LABEL note is used by the insn.
464 This note is an INSN_LIST. */
467 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
468 write-after-read and write-after-write dependencies respectively.
469 Data dependencies, which are the only type of LOG_LINK created by
470 flow, are represented by a 0 reg note kind. */
471 REG_DEP_ANTI
, REG_DEP_OUTPUT
,
473 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
474 -fbranch-probabilities is given. It has an integer value. For jumps,
475 it is the probability that this is a taken branch. For calls, it is
476 the probability that this call won't return. */
479 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
480 the first insn after each CALL_INSN. It indicates how many times this
481 block was executed. */
484 /* Attached to a call insn; indicates that the call is malloc-like and
485 that the pointer returned cannot alias anything else. */
488 /* Used to optimize rtl generated by dynamic stack allocations for targets
489 where SETJMP_VIA_SAVE_AREA is true. */
492 /* Attached to JUMP_INSNs only, it holds the branch prediction flags
493 computed by get_jump_flags() after dbr scheduling is complete. */
496 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
497 for DWARF to interpret what they imply. The attached rtx is used
498 instead of intuition. */
499 REG_FRAME_RELATED_EXPR
,
501 /* Indicates that REG holds the exception context for the function.
502 This context is shared by inline functions, so the code to acquire
503 the real exception context is delayed until after inlining. */
506 /* Indicates what exception region an INSN belongs in. This is used to
507 indicate what region to which a call may throw. REGION 0 indicates
508 that a call cannot throw at all. REGION -1 indicates that it cannot
509 throw, nor will it execute a non-local goto. */
512 /* Indicates that a call is actually a call to rethrow, and specifies the
513 rethrow symbol for the region the rethrow is targetting. This provides
514 a way to generate the non standard flow edges required for a rethrow. */
517 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
521 /* The base value for branch probability notes. */
522 #define REG_BR_PROB_BASE 10000
524 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
525 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
526 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
528 /* Names for REG_NOTE's in EXPR_LIST insn's. */
530 extern const char * const reg_note_name
[];
531 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
533 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
534 USE and CLOBBER expressions.
535 USE expressions list the registers filled with arguments that
536 are passed to the function.
537 CLOBBER expressions document the registers explicitly clobbered
539 Pseudo registers can not be mentioned in this list. */
540 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
542 /* The label-number of a code-label. The assembler label
543 is made from `L' and the label-number printed in decimal.
544 Label numbers are unique in a compilation. */
545 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
547 #define LINE_NUMBER NOTE
549 /* In a NOTE that is a line number, this is a string for the file name that the
550 line is in. We use the same field to record block numbers temporarily in
551 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
552 between ints and pointers if we use a different macro for the block number.)
553 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
554 information as a rtx in the field. */
556 #define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
557 #define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
558 #define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
559 #define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
560 #define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
561 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
562 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
564 /* In a NOTE that is a line number, this is the line number.
565 Other kinds of NOTEs are identified by negative numbers here. */
566 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
568 /* Codes that appear in the NOTE_LINE_NUMBER field
569 for kinds of notes that are not line numbers.
571 Notice that we do not try to use zero here for any of
572 the special note codes because sometimes the source line
573 actually can be zero! This happens (for example) when we
574 are generating code for the per-translation-unit constructor
575 and destructor routines for some C++ translation unit.
577 If you should change any of the following values, or if you
578 should add a new value here, don't forget to change the
579 note_insn_name array in rtl.c. */
583 /* Keep all of these numbers negative. Adjust as needed. */
584 NOTE_INSN_BIAS
= -100,
586 /* This note is used to get rid of an insn
587 when it isn't safe to patch the insn out of the chain. */
590 /* These are used to mark the beginning and end of a lexical block.
591 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
595 /* These mark the extremes of a loop. */
599 /* Generated at the place in a loop that `continue' jumps to. */
601 /* Generated at the start of a duplicated exit test. */
604 /* This kind of note is generated at the end of the function body,
605 just before the return insn or return label. In an optimizing
606 compilation it is deleted by the first jump optimization, after
607 enabling that optimizer to determine whether control can fall
608 off the end of the function body without a return statement. */
609 NOTE_INSN_FUNCTION_END
,
611 /* This kind of note is generated just after each call to `setjmp',
612 and similar functions that can return twice. */
615 /* This marks the point immediately after the last prologue insn. */
616 NOTE_INSN_PROLOGUE_END
,
618 /* This marks the point immediately prior to the first epilogue insn. */
619 NOTE_INSN_EPILOGUE_BEG
,
621 /* Generated in place of user-declared labels when they are deleted. */
622 NOTE_INSN_DELETED_LABEL
,
624 /* This note indicates the start of the real body of the function,
625 i.e. the point just after all of the parms have been moved into
627 NOTE_INSN_FUNCTION_BEG
,
629 /* These note where exception handling regions begin and end.
630 Uses NOTE_EH_HANDLER to identify the region in question. */
631 NOTE_INSN_EH_REGION_BEG
,
632 NOTE_INSN_EH_REGION_END
,
634 /* Generated whenever a duplicate line number note is output. For example,
635 one is output after the end of an inline function, in order to prevent
636 the line containing the inline call from being counted twice in gcov. */
637 NOTE_INSN_REPEATED_LINE_NUMBER
,
639 /* Start/end of a live range region, where pseudos allocated on the stack
640 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
644 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
647 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
648 NOTE_INSN_BASIC_BLOCK
,
650 /* Record the expected value of a register at a location. Uses
651 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
652 NOTE_INSN_EXPECTED_VALUE
,
657 /* Names for NOTE insn's other than line numbers. */
659 extern const char * const note_insn_name
[NOTE_INSN_MAX
- NOTE_INSN_BIAS
];
660 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
661 (note_insn_name[(NOTE_CODE) - NOTE_INSN_BIAS])
663 /* The name of a label, in case it corresponds to an explicit label
664 in the input source code. */
665 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
667 /* In jump.c, each label contains a count of the number
668 of LABEL_REFs that point at it, so unused labels can be deleted. */
669 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
671 /* Associate a name with a CODE_LABEL. */
672 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
674 /* The original regno this ADDRESSOF was built for. */
675 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
677 /* The variable in the register we took the address of. */
678 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
680 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
681 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
682 be decremented and possibly the label can be deleted. */
683 #define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
685 /* Once basic blocks are found in flow.c,
686 each CODE_LABEL starts a chain that goes through
687 all the LABEL_REFs that jump to that label.
688 The chain eventually winds up at the CODE_LABEL: it is circular. */
689 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
691 /* This is the field in the LABEL_REF through which the circular chain
692 of references to a particular label is linked.
693 This chain is set up in flow.c. */
695 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
697 /* Once basic blocks are found in flow.c,
698 Each LABEL_REF points to its containing instruction with this field. */
700 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
702 /* For a REG rtx, REGNO extracts the register number. */
704 #define REGNO(RTX) XCUINT(RTX, 0, REG)
706 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
707 is the current function's return value. */
709 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
711 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
712 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
714 /* For a CONST_INT rtx, INTVAL extracts the integer. */
716 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
718 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
719 SUBREG_WORD extracts the word-number. */
721 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
722 #define SUBREG_WORD(RTX) XCUINT(RTX, 1, SUBREG)
724 /* 1 if the REG contained in SUBREG_REG is already known to be
725 sign- or zero-extended from the mode of the SUBREG to the mode of
726 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
729 When used as a LHS, is means that this extension must be done
730 when assigning to SUBREG_REG. */
732 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
733 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
735 /* Access various components of an ASM_OPERANDS rtx. */
737 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
738 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
739 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
740 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
741 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
742 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
743 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
744 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
745 XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
746 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
747 GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
748 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
749 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
751 /* For a MEM rtx, 1 if it's a volatile reference.
752 Also in an ASM_OPERANDS rtx. */
753 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
755 /* For a MEM rtx, 1 if it refers to an aggregate, either to the
756 aggregate itself of to a field of the aggregate. If zero, RTX may
757 or may not be such a refrence. */
758 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
760 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
761 not refer to a scalar.*/
762 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
764 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
765 RTX. Otherwise, vice versa. Use this macro only when you are
766 *sure* that you know that the MEM is in a structure, or is a
767 scalar. VAL is evaluated only once. */
768 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
771 MEM_IN_STRUCT_P (RTX) = 1; \
772 MEM_SCALAR_P (RTX) = 0; \
776 MEM_IN_STRUCT_P (RTX) = 0; \
777 MEM_SCALAR_P (RTX) = 1; \
781 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
782 set, and may alias anything. Otherwise, the MEM can only alias
783 MEMs in the same alias set. This value is set in a
784 language-dependent manner in the front-end, and should not be
785 altered in the back-end. These set numbers are tested for zero,
786 and compared for equality; they have no other significance. In
787 some front-ends, these numbers may correspond in some way to types,
788 or other language-level entities, but they need not, and the
789 back-end makes no such assumptions. */
790 #define MEM_ALIAS_SET(RTX) XCWINT(RTX, 1, MEM)
792 /* Copy the attributes that apply to memory locations from RHS to LHS. */
793 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
794 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
795 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
796 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
797 MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS), \
798 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
800 /* For a LABEL_REF, 1 means that this reference is to a label outside the
801 loop containing the reference. */
802 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
804 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
805 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
806 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
808 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
809 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
811 /* For a REG, 1 means the register is used only in an exit test of a loop. */
812 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
814 /* During sched, for an insn, 1 means that the insn must be scheduled together
815 with the preceding insn. */
816 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
818 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
819 cost of the dependence link. The cost of executing an instruction
820 may vary based on how the results are used. LINK_COST_ZERO is 1 when
821 the cost through the link varies and is unchanged (i.e., the link has
822 zero additional cost). LINK_COST_FREE is 1 when the cost through the
823 link is zero (i.e., the link makes the cost free). In other cases,
824 the adjustment to the cost is recomputed each time it is needed. */
825 #define LINK_COST_ZERO(X) ((X)->jump)
826 #define LINK_COST_FREE(X) ((X)->call)
828 /* For a SET rtx, SET_DEST is the place that is set
829 and SET_SRC is the value it is set to. */
830 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
831 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
833 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
834 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
835 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
837 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
838 conditionally executing the code on, COND_EXEC_CODE is the code
839 to execute if the condition is true. */
840 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
841 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
843 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
844 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
846 /* Flag in a SYMBOL_REF for machine-specific purposes. */
847 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
849 /* 1 in a SYMBOL_REF if it represents a symbol which might have to change
850 if its inlined or unrolled. */
851 #define SYMBOL_REF_NEED_ADJUST(RTX) ((RTX)->in_struct)
853 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
854 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
856 /* Define a macro to look for REG_INC notes,
857 but save time on machines where they never exist. */
859 /* Don't continue this line--convex cc version 4.1 would lose. */
860 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
861 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
863 #define FIND_REG_INC_NOTE(insn, reg) 0
866 /* Indicate whether the machine has any sort of auto increment addressing.
867 If not, we can avoid checking for REG_INC notes. */
869 /* Don't continue this line--convex cc version 4.1 would lose. */
870 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
874 #ifndef HAVE_PRE_INCREMENT
875 #define HAVE_PRE_INCREMENT 0
878 #ifndef HAVE_PRE_DECREMENT
879 #define HAVE_PRE_DECREMENT 0
882 #ifndef HAVE_POST_INCREMENT
883 #define HAVE_POST_INCREMENT 0
886 #ifndef HAVE_POST_DECREMENT
887 #define HAVE_POST_DECREMENT 0
891 /* Some architectures do not have complete pre/post increment/decrement
892 instruction sets, or only move some modes efficiently. These macros
893 allow us to tune autoincrement generation. */
895 #ifndef USE_LOAD_POST_INCREMENT
896 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
899 #ifndef USE_LOAD_POST_DECREMENT
900 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
903 #ifndef USE_LOAD_PRE_INCREMENT
904 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
907 #ifndef USE_LOAD_PRE_DECREMENT
908 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
911 #ifndef USE_STORE_POST_INCREMENT
912 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
915 #ifndef USE_STORE_POST_DECREMENT
916 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
919 #ifndef USE_STORE_PRE_INCREMENT
920 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
923 #ifndef USE_STORE_PRE_DECREMENT
924 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
928 /* Accessors for RANGE_INFO. */
929 /* For RANGE_{START,END} notes return the RANGE_START note. */
930 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
932 /* For RANGE_{START,END} notes return the RANGE_START note. */
933 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
935 /* For RANGE_{START,END} notes, return the vector containing the registers used
937 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
938 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
939 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
941 /* For RANGE_{START,END} notes, the number of calls within the range. */
942 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
944 /* For RANGE_{START,END} notes, the number of insns within the range. */
945 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
947 /* For RANGE_{START,END} notes, a unique # to identify this range. */
948 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
950 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
951 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
953 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
954 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
956 /* For RANGE_{START,END} notes, the loop depth the range is in. */
957 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
959 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
961 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
963 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
965 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
967 /* For RANGE_START notes, the marker # of the start of the range. */
968 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
970 /* For RANGE_START notes, the marker # of the end of the range. */
971 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
973 /* Original pseudo register # for a live range note. */
974 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
976 /* Pseudo register # original register is copied into or -1. */
977 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
979 /* How many times a register in a live range note was referenced. */
980 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
982 /* How many times a register in a live range note was set. */
983 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
985 /* How many times a register in a live range note died. */
986 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
988 /* Whether the original value is needed to be copied into the range register at
989 the start of the range. */
990 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
992 /* # of insns the register copy is live over. */
993 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
995 /* # of calls the register copy is live over. */
996 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
998 /* DECL_NODE pointer of the declaration if the register is a user defined
1000 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1002 /* BLOCK_NODE pointer to the block the variable is declared in if the
1003 register is a user defined variable. */
1004 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1006 /* EXPR_LIST of the distinct ranges a variable is in. */
1007 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1009 /* Block a variable is declared in. */
1010 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1012 /* # of distinct ranges a variable is in. */
1013 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1015 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1016 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1018 /* For a NOTE_INSN_LIVE note, the original basic block number. */
1019 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1021 /* Determine if the insn is a PHI node. */
1022 #define PHI_NODE_P(X) \
1023 (X && GET_CODE (X) == INSN \
1024 && GET_CODE (PATTERN (X)) == SET \
1025 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1027 /* Nonzero if we need to distinguish between the return value of this function
1028 and the return value of a function called by this function. This helps
1030 This is 1 until after the rtl generation pass. */
1031 extern int rtx_equal_function_value_matters
;
1033 /* Generally useful functions. */
1035 /* The following functions accept a wide integer argument. Rather than
1036 having to cast on every function call, we use a macro instead, that is
1037 defined here and in tree.h. */
1040 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
1041 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
1043 extern int exact_log2_wide
PARAMS ((unsigned HOST_WIDE_INT
));
1044 extern int floor_log2_wide
PARAMS ((unsigned HOST_WIDE_INT
));
1047 extern int ceil_log2
PARAMS ((unsigned HOST_WIDE_INT
));
1049 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1051 #define plus_constant_for_output(X,C) \
1052 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
1055 extern void set_stack_check_libfunc
PARAMS ((rtx
));
1056 extern HOST_WIDE_INT trunc_int_for_mode
PARAMS ((HOST_WIDE_INT
,
1057 enum machine_mode
));
1058 extern rtx plus_constant_wide
PARAMS ((rtx
, HOST_WIDE_INT
));
1059 extern rtx plus_constant_for_output_wide
PARAMS ((rtx
, HOST_WIDE_INT
));
1060 extern void optimize_save_area_alloca
PARAMS ((rtx
));
1062 extern rtx gen_rtx
PARAMS ((enum rtx_code
,
1063 enum machine_mode
, ...));
1064 extern rtvec gen_rtvec
PARAMS ((int, ...));
1066 extern char *oballoc
PARAMS ((int));
1067 extern char *permalloc
PARAMS ((int));
1068 extern rtx rtx_alloc
PARAMS ((RTX_CODE
));
1069 extern rtvec rtvec_alloc
PARAMS ((int));
1070 extern rtx copy_insn_1
PARAMS ((rtx
));
1071 extern rtx copy_insn
PARAMS ((rtx
));
1072 extern rtx copy_rtx
PARAMS ((rtx
));
1073 extern rtx copy_rtx_if_shared
PARAMS ((rtx
));
1074 extern rtx copy_most_rtx
PARAMS ((rtx
, rtx
));
1075 extern rtx shallow_copy_rtx
PARAMS ((rtx
));
1076 extern int rtx_equal_p
PARAMS ((rtx
, rtx
));
1077 extern rtvec gen_rtvec_v
PARAMS ((int, rtx
*));
1078 extern rtx gen_reg_rtx
PARAMS ((enum machine_mode
));
1079 extern rtx gen_label_rtx
PARAMS ((void));
1080 extern rtx gen_lowpart_common
PARAMS ((enum machine_mode
, rtx
));
1081 extern rtx gen_lowpart
PARAMS ((enum machine_mode
, rtx
));
1082 extern rtx gen_lowpart_if_possible
PARAMS ((enum machine_mode
, rtx
));
1083 extern rtx gen_highpart
PARAMS ((enum machine_mode
, rtx
));
1084 extern rtx gen_realpart
PARAMS ((enum machine_mode
, rtx
));
1085 extern rtx gen_imagpart
PARAMS ((enum machine_mode
, rtx
));
1086 extern rtx operand_subword
PARAMS ((rtx
, unsigned int, int,
1087 enum machine_mode
));
1088 extern rtx operand_subword_force
PARAMS ((rtx
, unsigned int,
1089 enum machine_mode
));
1090 extern int subreg_lowpart_p
PARAMS ((rtx
));
1091 extern rtx make_safe_from
PARAMS ((rtx
, rtx
));
1092 extern rtx convert_memory_address
PARAMS ((enum machine_mode
, rtx
));
1093 extern rtx memory_address
PARAMS ((enum machine_mode
, rtx
));
1094 extern rtx get_insns
PARAMS ((void));
1095 extern const char *get_insn_name
PARAMS ((int));
1096 extern rtx get_last_insn
PARAMS ((void));
1097 extern rtx get_last_insn_anywhere
PARAMS ((void));
1098 extern void start_sequence
PARAMS ((void));
1099 extern void push_to_sequence
PARAMS ((rtx
));
1100 extern void end_sequence
PARAMS ((void));
1101 extern void push_to_full_sequence
PARAMS ((rtx
, rtx
));
1102 extern void end_full_sequence
PARAMS ((rtx
*, rtx
*));
1103 extern rtx gen_sequence
PARAMS ((void));
1104 extern rtx immed_double_const
PARAMS ((HOST_WIDE_INT
, HOST_WIDE_INT
, enum machine_mode
));
1105 extern rtx force_const_mem
PARAMS ((enum machine_mode
, rtx
));
1106 extern rtx force_reg
PARAMS ((enum machine_mode
, rtx
));
1107 extern rtx get_pool_constant
PARAMS ((rtx
));
1108 extern enum machine_mode get_pool_mode
PARAMS ((rtx
));
1109 extern rtx get_pool_constant_for_function
PARAMS ((struct function
*, rtx
));
1110 extern enum machine_mode get_pool_mode_for_function
PARAMS ((struct function
*, rtx
));
1111 extern int get_pool_offset
PARAMS ((rtx
));
1112 extern rtx simplify_subtraction
PARAMS ((rtx
));
1113 extern rtx assign_stack_local
PARAMS ((enum machine_mode
,
1114 HOST_WIDE_INT
, int));
1115 extern rtx assign_stack_temp
PARAMS ((enum machine_mode
,
1116 HOST_WIDE_INT
, int));
1117 extern rtx assign_temp
PARAMS ((union tree_node
*,
1119 extern rtx protect_from_queue
PARAMS ((rtx
, int));
1120 extern void emit_queue
PARAMS ((void));
1121 extern rtx emit_move_insn
PARAMS ((rtx
, rtx
));
1122 extern rtx emit_insn_before
PARAMS ((rtx
, rtx
));
1123 extern rtx emit_jump_insn_before
PARAMS ((rtx
, rtx
));
1124 extern rtx emit_call_insn_before
PARAMS ((rtx
, rtx
));
1125 extern rtx emit_barrier_before
PARAMS ((rtx
));
1126 extern rtx emit_label_before
PARAMS ((rtx
, rtx
));
1127 extern rtx emit_note_before
PARAMS ((int, rtx
));
1128 extern rtx emit_insn_after
PARAMS ((rtx
, rtx
));
1129 extern rtx emit_jump_insn_after
PARAMS ((rtx
, rtx
));
1130 extern rtx emit_barrier_after
PARAMS ((rtx
));
1131 extern rtx emit_label_after
PARAMS ((rtx
, rtx
));
1132 extern rtx emit_note_after
PARAMS ((int, rtx
));
1133 extern rtx emit_line_note_after
PARAMS ((const char *, int, rtx
));
1134 extern rtx emit_insn
PARAMS ((rtx
));
1135 extern rtx emit_insns
PARAMS ((rtx
));
1136 extern rtx emit_insns_before
PARAMS ((rtx
, rtx
));
1137 extern rtx emit_insns_after
PARAMS ((rtx
, rtx
));
1138 extern rtx emit_jump_insn
PARAMS ((rtx
));
1139 extern rtx emit_call_insn
PARAMS ((rtx
));
1140 extern rtx emit_label
PARAMS ((rtx
));
1141 extern rtx emit_barrier
PARAMS ((void));
1142 extern rtx emit_line_note
PARAMS ((const char *, int));
1143 extern rtx emit_note
PARAMS ((const char *, int));
1144 extern rtx emit_line_note_force
PARAMS ((const char *, int));
1145 extern rtx make_insn_raw
PARAMS ((rtx
));
1146 extern rtx previous_insn
PARAMS ((rtx
));
1147 extern rtx next_insn
PARAMS ((rtx
));
1148 extern rtx prev_nonnote_insn
PARAMS ((rtx
));
1149 extern rtx next_nonnote_insn
PARAMS ((rtx
));
1150 extern rtx prev_real_insn
PARAMS ((rtx
));
1151 extern rtx next_real_insn
PARAMS ((rtx
));
1152 extern rtx prev_active_insn
PARAMS ((rtx
));
1153 extern rtx next_active_insn
PARAMS ((rtx
));
1154 extern int active_insn_p
PARAMS ((rtx
));
1155 extern rtx prev_label
PARAMS ((rtx
));
1156 extern rtx next_label
PARAMS ((rtx
));
1157 extern rtx next_cc0_user
PARAMS ((rtx
));
1158 extern rtx prev_cc0_setter
PARAMS ((rtx
));
1159 extern rtx next_nondeleted_insn
PARAMS ((rtx
));
1160 extern enum rtx_code reverse_condition
PARAMS ((enum rtx_code
));
1161 extern enum rtx_code reverse_condition_maybe_unordered
PARAMS ((enum rtx_code
));
1162 extern enum rtx_code swap_condition
PARAMS ((enum rtx_code
));
1163 extern enum rtx_code unsigned_condition
PARAMS ((enum rtx_code
));
1164 extern enum rtx_code signed_condition
PARAMS ((enum rtx_code
));
1165 extern rtx find_equiv_reg
PARAMS ((rtx
, rtx
, enum reg_class
, int, short *, int, enum machine_mode
));
1166 extern rtx squeeze_notes
PARAMS ((rtx
, rtx
));
1167 extern rtx delete_insn
PARAMS ((rtx
));
1168 extern void delete_jump
PARAMS ((rtx
));
1169 extern void delete_barrier
PARAMS ((rtx
));
1170 extern rtx get_label_before
PARAMS ((rtx
));
1171 extern rtx get_label_after
PARAMS ((rtx
));
1172 extern rtx follow_jumps
PARAMS ((rtx
));
1173 extern rtx adj_offsettable_operand
PARAMS ((rtx
, int));
1174 extern rtx try_split
PARAMS ((rtx
, rtx
, int));
1175 extern rtx split_insns
PARAMS ((rtx
, rtx
));
1176 extern rtx simplify_unary_operation
PARAMS ((enum rtx_code
, enum machine_mode
, rtx
, enum machine_mode
));
1177 extern rtx simplify_binary_operation
PARAMS ((enum rtx_code
, enum machine_mode
, rtx
, rtx
));
1178 extern rtx simplify_ternary_operation
PARAMS ((enum rtx_code
, enum machine_mode
, enum machine_mode
, rtx
, rtx
, rtx
));
1179 extern rtx simplify_relational_operation
PARAMS ((enum rtx_code
, enum machine_mode
, rtx
, rtx
));
1180 extern rtx simplify_gen_binary
PARAMS ((enum rtx_code
, enum machine_mode
,
1182 extern rtx simplify_rtx
PARAMS ((rtx
));
1183 extern rtx gen_move_insn
PARAMS ((rtx
, rtx
));
1184 extern rtx gen_jump
PARAMS ((rtx
));
1185 extern rtx gen_beq
PARAMS ((rtx
));
1186 extern rtx gen_bge
PARAMS ((rtx
));
1187 extern rtx gen_ble
PARAMS ((rtx
));
1188 extern rtx gen_mem_addressof
PARAMS ((rtx
, union tree_node
*));
1189 extern rtx eliminate_constant_term
PARAMS ((rtx
, rtx
*));
1190 extern rtx expand_complex_abs
PARAMS ((enum machine_mode
, rtx
, rtx
,
1192 extern enum machine_mode choose_hard_reg_mode
PARAMS ((unsigned int,
1194 extern void set_unique_reg_note
PARAMS ((rtx
, enum reg_note
, rtx
));
1196 /* Functions in rtlanal.c */
1198 extern int rtx_unstable_p
PARAMS ((rtx
));
1199 extern int rtx_varies_p
PARAMS ((rtx
));
1200 extern int rtx_addr_varies_p
PARAMS ((rtx
));
1201 extern HOST_WIDE_INT get_integer_term
PARAMS ((rtx
));
1202 extern rtx get_related_value
PARAMS ((rtx
));
1203 extern int reg_mentioned_p
PARAMS ((rtx
, rtx
));
1204 extern int reg_referenced_p
PARAMS ((rtx
, rtx
));
1205 extern int reg_used_between_p
PARAMS ((rtx
, rtx
, rtx
));
1206 extern int reg_referenced_between_p
PARAMS ((rtx
, rtx
, rtx
));
1207 extern int reg_set_between_p
PARAMS ((rtx
, rtx
, rtx
));
1208 extern int regs_set_between_p
PARAMS ((rtx
, rtx
, rtx
));
1209 extern int modified_between_p
PARAMS ((rtx
, rtx
, rtx
));
1210 extern int no_labels_between_p
PARAMS ((rtx
, rtx
));
1211 extern int no_jumps_between_p
PARAMS ((rtx
, rtx
));
1212 extern int modified_in_p
PARAMS ((rtx
, rtx
));
1213 extern int insn_dependant_p
PARAMS ((rtx
, rtx
));
1214 extern int reg_set_p
PARAMS ((rtx
, rtx
));
1215 extern rtx single_set
PARAMS ((rtx
));
1216 extern int multiple_sets
PARAMS ((rtx
));
1217 extern rtx find_last_value
PARAMS ((rtx
, rtx
*, rtx
, int));
1218 extern int refers_to_regno_p
PARAMS ((unsigned int, unsigned int,
1220 extern int reg_overlap_mentioned_p
PARAMS ((rtx
, rtx
));
1221 extern void note_stores
PARAMS ((rtx
,
1222 void (*) (rtx
, rtx
, void *),
1224 extern rtx reg_set_last
PARAMS ((rtx
, rtx
));
1225 extern int dead_or_set_p
PARAMS ((rtx
, rtx
));
1226 extern int dead_or_set_regno_p
PARAMS ((rtx
, unsigned int));
1227 extern rtx find_reg_note
PARAMS ((rtx
, enum reg_note
, rtx
));
1228 extern rtx find_regno_note
PARAMS ((rtx
, enum reg_note
,
1230 extern int find_reg_fusage
PARAMS ((rtx
, enum rtx_code
, rtx
));
1231 extern int find_regno_fusage
PARAMS ((rtx
, enum rtx_code
,
1233 extern void remove_note
PARAMS ((rtx
, rtx
));
1234 extern int side_effects_p
PARAMS ((rtx
));
1235 extern int volatile_refs_p
PARAMS ((rtx
));
1236 extern int volatile_insn_p
PARAMS ((rtx
));
1237 extern int may_trap_p
PARAMS ((rtx
));
1238 extern int inequality_comparisons_p
PARAMS ((rtx
));
1239 extern rtx replace_rtx
PARAMS ((rtx
, rtx
, rtx
));
1240 extern rtx replace_regs
PARAMS ((rtx
, rtx
*, unsigned int,
1242 extern int computed_jump_p
PARAMS ((rtx
));
1243 typedef int (*rtx_function
) PARAMS ((rtx
*, void *));
1244 extern int for_each_rtx
PARAMS ((rtx
*, rtx_function
, void *));
1245 extern rtx regno_use_in
PARAMS ((unsigned int, rtx
));
1246 extern int auto_inc_p
PARAMS ((rtx
));
1247 extern void remove_node_from_expr_list
PARAMS ((rtx
, rtx
*));
1248 extern int insns_safe_to_move_p
PARAMS ((rtx
, rtx
, rtx
*));
1249 extern int loc_mentioned_in_p
PARAMS ((rtx
*, rtx
));
1253 extern rtx find_use_as_address
PARAMS ((rtx
, rtx
, HOST_WIDE_INT
));
1254 void init_EXPR_INSN_LIST_cache
PARAMS ((void));
1255 void free_EXPR_LIST_list
PARAMS ((rtx
*));
1256 void free_INSN_LIST_list
PARAMS ((rtx
*));
1257 void free_EXPR_LIST_node
PARAMS ((rtx
));
1258 void free_INSN_LIST_node
PARAMS ((rtx
));
1259 rtx alloc_INSN_LIST
PARAMS ((rtx
, rtx
));
1260 rtx alloc_EXPR_LIST
PARAMS ((int, rtx
, rtx
));
1261 void clear_log_links
PARAMS ((rtx
));
1265 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1266 Always at least 3, since the combiner could put that many togetherm
1267 and we want this to remain correct for all the remaining passes. */
1269 extern int max_parallel
;
1271 /* Free up register info memory. */
1272 extern void free_reg_info
PARAMS ((void));
1275 extern int asm_noperands
PARAMS ((rtx
));
1276 extern const char *decode_asm_operands
PARAMS ((rtx
, rtx
*, rtx
**,
1278 enum machine_mode
*));
1280 extern enum reg_class reg_preferred_class
PARAMS ((int));
1281 extern enum reg_class reg_alternate_class
PARAMS ((int));
1283 extern rtx get_first_nonparm_insn
PARAMS ((void));
1285 extern void split_all_insns
PARAMS ((int));
1287 #define MAX_SAVED_CONST_INT 64
1288 extern rtx const_int_rtx
[MAX_SAVED_CONST_INT
* 2 + 1];
1290 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1291 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1292 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1293 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1294 extern rtx const_true_rtx
;
1296 extern rtx const_tiny_rtx
[3][(int) MAX_MACHINE_MODE
];
1298 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1299 same as VOIDmode. */
1301 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1303 /* Likewise, for the constants 1 and 2. */
1305 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1306 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1308 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1309 is used to represent the frame pointer. This is because the
1310 hard frame pointer and the automatic variables are separated by an amount
1311 that cannot be determined until after register allocation. We can assume
1312 that in this case ELIMINABLE_REGS will be defined, one action of which
1313 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1314 #ifndef HARD_FRAME_POINTER_REGNUM
1315 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1318 /* Index labels for global_rtl. */
1319 enum global_rtl_index
1325 /* For register elimination to work properly these hard_frame_pointer_rtx,
1326 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1327 the same register. */
1328 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1329 GR_ARG_POINTER
= GR_FRAME_POINTER
,
1331 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1332 GR_HARD_FRAME_POINTER
= GR_FRAME_POINTER
,
1334 GR_HARD_FRAME_POINTER
,
1336 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1337 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1338 GR_ARG_POINTER
= GR_HARD_FRAME_POINTER
,
1343 GR_VIRTUAL_INCOMING_ARGS
,
1344 GR_VIRTUAL_STACK_ARGS
,
1345 GR_VIRTUAL_STACK_DYNAMIC
,
1346 GR_VIRTUAL_OUTGOING_ARGS
,
1352 /* Pointers to standard pieces of rtx are stored here. */
1353 extern rtx global_rtl
[GR_MAX
];
1355 /* Standard pieces of rtx, to be substituted directly into things. */
1356 #define pc_rtx (global_rtl[GR_PC])
1357 #define cc0_rtx (global_rtl[GR_CC0])
1359 /* All references to certain hard regs, except those created
1360 by allocating pseudo regs into them (when that's possible),
1361 go through these unique rtx objects. */
1362 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1363 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1364 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1365 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1367 extern rtx pic_offset_table_rtx
;
1368 extern rtx struct_value_rtx
;
1369 extern rtx struct_value_incoming_rtx
;
1370 extern rtx static_chain_rtx
;
1371 extern rtx static_chain_incoming_rtx
;
1372 extern rtx return_address_pointer_rtx
;
1374 /* Include the RTL generation functions. */
1380 /* There are some RTL codes that require special attention; the
1381 generation functions included above do the raw handling. If you
1382 add to this list, modify special_rtx in gengenrtl.c as well. You
1383 should also modify gen_rtx to use the special function. */
1385 extern rtx gen_rtx_CONST_DOUBLE
PARAMS ((enum machine_mode
, rtx
,
1386 HOST_WIDE_INT
, HOST_WIDE_INT
));
1387 extern rtx gen_rtx_CONST_INT
PARAMS ((enum machine_mode
, HOST_WIDE_INT
));
1388 extern rtx gen_rtx_REG
PARAMS ((enum machine_mode
, int));
1389 extern rtx gen_rtx_MEM
PARAMS ((enum machine_mode
, rtx
));
1391 /* We need the cast here to ensure that we get the same result both with
1392 and without prototypes. */
1393 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1395 /* Virtual registers are used during RTL generation to refer to locations into
1396 the stack frame when the actual location isn't known until RTL generation
1397 is complete. The routine instantiate_virtual_regs replaces these with
1398 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1401 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1403 /* This points to the first word of the incoming arguments passed on the stack,
1404 either by the caller or by the callee when pretending it was passed by the
1407 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1409 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1411 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1412 variable on the stack. Otherwise, it points to the first variable on
1415 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1417 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1419 /* This points to the location of dynamically-allocated memory on the stack
1420 immediately after the stack pointer has been adjusted by the amount
1423 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1425 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1427 /* This points to the location in the stack at which outgoing arguments should
1428 be written when the stack is pre-pushed (arguments pushed using push
1429 insns always use sp). */
1431 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1433 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1435 /* This points to the Canonical Frame Address of the function. This
1436 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1437 but is calculated relative to the arg pointer for simplicity; the
1438 frame pointer nor stack pointer are necessarily fixed relative to
1439 the CFA until after reload. */
1441 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1443 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1445 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1447 extern rtx find_next_ref
PARAMS ((rtx
, rtx
));
1448 extern rtx
*find_single_use
PARAMS ((rtx
, rtx
, rtx
*));
1450 extern rtx output_constant_def
PARAMS ((union tree_node
*));
1451 extern rtx immed_real_const
PARAMS ((union tree_node
*));
1452 extern union tree_node
*make_tree
PARAMS ((union tree_node
*, rtx
));
1454 /* Define a default value for STORE_FLAG_VALUE. */
1456 #ifndef STORE_FLAG_VALUE
1457 #define STORE_FLAG_VALUE 1
1460 /* Nonzero after the second flow pass has completed.
1461 Set to 1 or 0 by toplev.c */
1462 extern int flow2_completed
;
1464 /* Nonzero after end of reload pass.
1465 Set to 1 or 0 by reload1.c. */
1467 extern int reload_completed
;
1469 /* Set to 1 while reload_as_needed is operating.
1470 Required by some machines to handle any generated moves differently. */
1472 extern int reload_in_progress
;
1474 /* If this is nonzero, we do not bother generating VOLATILE
1475 around volatile memory references, and we are willing to
1476 output indirect addresses. If cse is to follow, we reject
1477 indirect addresses so a useful potential cse is generated;
1478 if it is used only once, instruction combination will produce
1479 the same indirect address eventually. */
1480 extern int cse_not_expected
;
1482 /* Set to nonzero before life analysis to indicate that it is unsafe to
1483 generate any new pseudo registers. */
1484 extern int no_new_pseudos
;
1486 /* Translates rtx code to tree code, for those codes needed by
1487 REAL_ARITHMETIC. The function returns an int because the caller may not
1488 know what `enum tree_code' means. */
1490 extern int rtx_to_tree_code
PARAMS ((enum rtx_code
));
1493 extern void obfree
PARAMS ((char *));
1495 extern void gcc_obstack_init
PARAMS ((struct obstack
*));
1496 extern void pop_obstacks
PARAMS ((void));
1497 extern void push_obstacks
PARAMS ((struct obstack
*,
1500 struct cse_basic_block_data
;
1501 extern int rtx_cost
PARAMS ((rtx
, enum rtx_code
));
1502 extern int address_cost
PARAMS ((rtx
, enum machine_mode
));
1503 extern void delete_trivially_dead_insns
PARAMS ((rtx
, int));
1505 extern int cse_main
PARAMS ((rtx
, int, int, FILE *));
1507 extern void cse_end_of_basic_block
PARAMS ((rtx
,
1508 struct cse_basic_block_data
*,
1512 extern int comparison_dominates_p
PARAMS ((enum rtx_code
, enum rtx_code
));
1513 extern int condjump_p
PARAMS ((rtx
));
1514 extern int any_condjump_p
PARAMS ((rtx
));
1515 extern int any_uncondjump_p
PARAMS ((rtx
));
1516 extern int safe_to_remove_jump_p
PARAMS ((rtx
));
1517 extern rtx pc_set
PARAMS ((rtx
));
1518 extern rtx condjump_label
PARAMS ((rtx
));
1519 extern int simplejump_p
PARAMS ((rtx
));
1520 extern int returnjump_p
PARAMS ((rtx
));
1521 extern int onlyjump_p
PARAMS ((rtx
));
1522 extern int sets_cc0_p
PARAMS ((rtx
));
1523 extern int invert_jump_1
PARAMS ((rtx
, rtx
));
1524 extern int invert_jump
PARAMS ((rtx
, rtx
, int));
1525 extern int rtx_renumbered_equal_p
PARAMS ((rtx
, rtx
));
1526 extern int true_regnum
PARAMS ((rtx
));
1527 extern int redirect_jump_1
PARAMS ((rtx
, rtx
));
1528 extern int redirect_jump
PARAMS ((rtx
, rtx
, int));
1529 extern void jump_optimize
PARAMS ((rtx
, int, int, int));
1530 extern void jump_optimize_minimal
PARAMS ((rtx
));
1531 extern void rebuild_jump_labels
PARAMS ((rtx
));
1532 extern void thread_jumps
PARAMS ((rtx
, int, int));
1533 extern int rtx_equal_for_thread_p
PARAMS ((rtx
, rtx
, rtx
));
1534 extern int can_reverse_comparison_p
PARAMS ((rtx
, rtx
));
1535 extern void delete_for_peephole
PARAMS ((rtx
, rtx
));
1536 extern int condjump_in_parallel_p
PARAMS ((rtx
));
1537 extern void never_reached_warning
PARAMS ((rtx
));
1539 /* Flags for jump_optimize() */
1540 #define JUMP_CROSS_JUMP 1
1541 #define JUMP_CROSS_JUMP_DEATH_MATTERS 2
1542 #define JUMP_NOOP_MOVES 1
1543 #define JUMP_AFTER_REGSCAN 1
1545 /* In emit-rtl.c. */
1546 extern int max_reg_num
PARAMS ((void));
1547 extern int max_label_num
PARAMS ((void));
1548 extern int get_first_label_num
PARAMS ((void));
1549 extern void delete_insns_since
PARAMS ((rtx
));
1550 extern void mark_reg_pointer
PARAMS ((rtx
, int));
1551 extern void mark_user_reg
PARAMS ((rtx
));
1552 extern void reset_used_flags
PARAMS ((rtx
));
1553 extern void reorder_insns
PARAMS ((rtx
, rtx
, rtx
));
1554 extern int get_max_uid
PARAMS ((void));
1555 extern int in_sequence_p
PARAMS ((void));
1556 extern void force_next_line_note
PARAMS ((void));
1557 extern void clear_emit_caches
PARAMS ((void));
1558 extern void init_emit
PARAMS ((void));
1559 extern void init_emit_once
PARAMS ((int));
1560 extern void push_topmost_sequence
PARAMS ((void));
1561 extern void pop_topmost_sequence
PARAMS ((void));
1562 extern int subreg_realpart_p
PARAMS ((rtx
));
1563 extern void reverse_comparison
PARAMS ((rtx
));
1564 extern void set_new_first_and_last_insn
PARAMS ((rtx
, rtx
));
1565 extern void set_new_first_and_last_label_num
PARAMS ((int, int));
1566 extern void set_new_last_label_num
PARAMS ((int));
1567 extern void unshare_all_rtl_again
PARAMS ((rtx
));
1568 extern void set_last_insn
PARAMS ((rtx
));
1569 extern void link_cc0_insns
PARAMS ((rtx
));
1570 extern void add_insn
PARAMS ((rtx
));
1571 extern void add_insn_before
PARAMS ((rtx
, rtx
));
1572 extern void add_insn_after
PARAMS ((rtx
, rtx
));
1573 extern void remove_insn
PARAMS ((rtx
));
1574 extern void reorder_insns_with_line_notes
PARAMS ((rtx
, rtx
, rtx
));
1575 extern void emit_insn_after_with_line_notes
PARAMS ((rtx
, rtx
, rtx
));
1576 extern enum rtx_code classify_insn
PARAMS ((rtx
));
1577 extern rtx emit
PARAMS ((rtx
));
1578 /* Query and clear/ restore no_line_numbers. This is used by the
1579 switch / case handling in stmt.c to give proper line numbers in
1580 warnings about unreachable code. */
1581 int force_line_numbers
PARAMS ((void));
1582 void restore_line_number_status
PARAMS ((int old_value
));
1583 extern void renumber_insns
PARAMS ((FILE *));
1584 extern void remove_unnecessary_notes
PARAMS ((void));
1586 /* In insn-emit.c */
1587 extern void add_clobbers
PARAMS ((rtx
, int));
1590 extern int combine_instructions
PARAMS ((rtx
, unsigned int));
1591 extern unsigned int extended_count
PARAMS ((rtx
, enum machine_mode
, int));
1592 extern rtx remove_death
PARAMS ((unsigned int, rtx
));
1594 extern void dump_combine_stats
PARAMS ((FILE *));
1595 extern void dump_combine_total_stats
PARAMS ((FILE *));
1600 extern void schedule_insns
PARAMS ((FILE *));
1602 extern void fix_sched_param
PARAMS ((const char *, const char *));
1604 /* In print-rtl.c */
1605 extern void debug_rtx
PARAMS ((rtx
));
1606 extern void debug_rtx_list
PARAMS ((rtx
, int));
1607 extern void debug_rtx_range
PARAMS ((rtx
, rtx
));
1608 extern rtx debug_rtx_find
PARAMS ((rtx
, int));
1610 extern void print_rtl
PARAMS ((FILE *, rtx
));
1611 extern int print_rtl_single
PARAMS ((FILE *, rtx
));
1612 extern void print_inline_rtx
PARAMS ((FILE *, rtx
, int));
1616 extern void init_loop
PARAMS ((void));
1617 extern rtx libcall_other_reg
PARAMS ((rtx
, rtx
));
1619 extern void loop_optimize
PARAMS ((rtx
, FILE *, int));
1621 extern void record_excess_regs
PARAMS ((rtx
, rtx
, rtx
*));
1624 extern void reposition_prologue_and_epilogue_notes
PARAMS ((rtx
));
1625 extern void thread_prologue_and_epilogue_insns
PARAMS ((rtx
));
1626 extern int prologue_epilogue_contains
PARAMS ((rtx
));
1627 extern int sibcall_epilogue_contains
PARAMS ((rtx
));
1628 extern HOST_WIDE_INT get_frame_size
PARAMS ((void));
1629 extern void preserve_rtl_expr_result
PARAMS ((rtx
));
1630 extern void mark_temp_addr_taken
PARAMS ((rtx
));
1631 extern void update_temp_slot_address
PARAMS ((rtx
, rtx
));
1632 extern void purge_addressof
PARAMS ((rtx
));
1635 extern int operands_match_p
PARAMS ((rtx
, rtx
));
1636 extern int safe_from_earlyclobber
PARAMS ((rtx
, rtx
));
1639 extern void set_file_and_line_for_stmt
PARAMS ((const char *, int));
1640 extern void expand_null_return
PARAMS ((void));
1641 extern void emit_jump
PARAMS ((rtx
));
1642 extern int preserve_subexpressions_p
PARAMS ((void));
1645 extern void init_expr_once
PARAMS ((void));
1646 extern void move_by_pieces
PARAMS ((rtx
, rtx
,
1647 unsigned HOST_WIDE_INT
,
1651 extern void allocate_bb_life_data
PARAMS ((void));
1652 extern void allocate_reg_life_data
PARAMS ((void));
1653 extern void recompute_reg_usage
PARAMS ((rtx
, int));
1655 extern void print_rtl_with_bb
PARAMS ((FILE *, rtx
));
1656 extern void dump_flow_info
PARAMS ((FILE *));
1660 extern void init_expmed
PARAMS ((void));
1661 extern void expand_inc
PARAMS ((rtx
, rtx
));
1662 extern void expand_dec
PARAMS ((rtx
, rtx
));
1663 extern rtx expand_mult_highpart
PARAMS ((enum machine_mode
, rtx
,
1664 unsigned HOST_WIDE_INT
, rtx
,
1669 extern int gcse_main
PARAMS ((rtx
, FILE *));
1673 extern void mark_elimination
PARAMS ((int, int));
1675 extern int global_alloc
PARAMS ((FILE *));
1676 extern void dump_global_regs
PARAMS ((FILE *));
1679 extern void retry_global_alloc
PARAMS ((int, HARD_REG_SET
));
1681 extern void build_insn_chain
PARAMS ((rtx
));
1684 extern int reg_classes_intersect_p
PARAMS ((enum reg_class
, enum reg_class
));
1685 extern int reg_class_subset_p
PARAMS ((enum reg_class
, enum reg_class
));
1686 extern void globalize_reg
PARAMS ((int));
1687 extern void init_regs
PARAMS ((void));
1688 extern void init_reg_sets
PARAMS ((void));
1689 extern void regset_release_memory
PARAMS ((void));
1690 extern void regclass_init
PARAMS ((void));
1691 extern void regclass
PARAMS ((rtx
, int, FILE *));
1692 extern void reg_scan
PARAMS ((rtx
, unsigned int, int));
1693 extern void reg_scan_update
PARAMS ((rtx
, rtx
, unsigned int));
1694 extern void fix_register
PARAMS ((const char *, int, int));
1696 extern void delete_null_pointer_checks
PARAMS ((rtx
));
1700 extern void regmove_optimize
PARAMS ((rtx
, int, FILE *));
1702 extern void combine_stack_adjustments
PARAMS ((void));
1706 extern void dbr_schedule
PARAMS ((rtx
, FILE *));
1710 extern void init_optabs
PARAMS ((void));
1712 /* In local-alloc.c */
1714 extern void dump_local_alloc
PARAMS ((FILE *));
1716 extern int local_alloc
PARAMS ((void));
1717 extern int function_invariant_p
PARAMS ((rtx
));
1720 extern void reload_cse_regs
PARAMS ((rtx
));
1721 extern void init_reload
PARAMS ((void));
1722 extern void mark_home_live
PARAMS ((int));
1724 extern int reload
PARAMS ((rtx
, int, FILE *));
1727 /* In caller-save.c */
1728 extern void init_caller_save
PARAMS ((void));
1731 extern void init_branch_prob
PARAMS ((const char *));
1732 extern void branch_prob
PARAMS ((void));
1733 extern void end_branch_prob
PARAMS ((void));
1734 extern void output_func_start_profiler
PARAMS ((void));
1736 /* In reg-stack.c */
1738 extern void reg_to_stack
PARAMS ((rtx
, FILE *));
1741 /* In fold-const.c */
1742 extern int add_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1743 unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1744 unsigned HOST_WIDE_INT
*,
1746 extern int neg_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1747 unsigned HOST_WIDE_INT
*,
1749 extern int mul_double
PARAMS ((unsigned HOST_WIDE_INT
,
1751 unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1752 unsigned HOST_WIDE_INT
*,
1754 extern void lshift_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1755 HOST_WIDE_INT
, unsigned int,
1756 unsigned HOST_WIDE_INT
*,
1757 HOST_WIDE_INT
*, int));
1758 extern void rshift_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1759 HOST_WIDE_INT
, unsigned int,
1760 unsigned HOST_WIDE_INT
*,
1761 HOST_WIDE_INT
*, int));
1762 extern void lrotate_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1763 HOST_WIDE_INT
, unsigned int,
1764 unsigned HOST_WIDE_INT
*,
1766 extern void rrotate_double
PARAMS ((unsigned HOST_WIDE_INT
, HOST_WIDE_INT
,
1767 HOST_WIDE_INT
, unsigned int,
1768 unsigned HOST_WIDE_INT
*,
1772 extern void emit_library_call
PARAMS ((rtx
, int, enum machine_mode
,
1774 extern rtx emit_library_call_value
PARAMS ((rtx
, rtx
, int,
1779 extern int set_dominates_use
PARAMS ((int, int, int, rtx
, rtx
));
1782 extern void bss_section
PARAMS ((void));
1783 extern int in_data_section
PARAMS ((void));
1784 extern int supports_one_only
PARAMS ((void));
1785 extern void init_varasm_once
PARAMS ((void));
1788 extern void init_rtl
PARAMS ((void));
1789 extern void rtx_free
PARAMS ((rtx
));
1792 extern int read_skip_spaces
PARAMS ((FILE *));
1793 extern rtx read_rtx
PARAMS ((FILE *));
1796 extern const char *read_rtx_filename
;
1797 extern int read_rtx_lineno
;
1799 /* Redefine abort to report an internal error w/o coredump, and
1800 reporting the location of the error in the source file. This logic
1801 is duplicated in rtl.h and tree.h because every file that needs the
1802 special abort includes one or both. toplev.h gets too few files,
1803 system.h gets too many. */
1805 extern void fancy_abort
PARAMS ((const char *, int, const char *))
1807 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
1810 extern rtx canon_rtx
PARAMS ((rtx
));
1811 extern int true_dependence
PARAMS ((rtx
, enum machine_mode
, rtx
,
1813 extern int read_dependence
PARAMS ((rtx
, rtx
));
1814 extern int anti_dependence
PARAMS ((rtx
, rtx
));
1815 extern int output_dependence
PARAMS ((rtx
, rtx
));
1816 extern void mark_constant_function
PARAMS ((void));
1817 extern void init_alias_once
PARAMS ((void));
1818 extern void init_alias_analysis
PARAMS ((void));
1819 extern void end_alias_analysis
PARAMS ((void));
1820 extern rtx addr_side_effect_eval
PARAMS ((rtx
, int, int));
1824 sibcall_use_normal
= 1,
1825 sibcall_use_tail_recursion
,
1829 extern void optimize_sibling_and_tail_recursive_calls
PARAMS ((void));
1830 extern void replace_call_placeholder
PARAMS ((rtx
, sibcall_use_t
));
1833 extern int stack_regs_mentioned
PARAMS ((rtx insn
));
1837 extern rtx stack_limit_rtx
;
1839 /* In regrename.c */
1840 extern void regrename_optimize
PARAMS ((void));
1843 extern void if_convert
PARAMS ((int));