1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 91-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
27 #undef FLOAT /* Likewise. */
28 #undef ABS /* Likewise. */
29 #undef PC /* Likewise. */
35 /* Register Transfer Language EXPRESSIONS CODES */
37 #define RTX_CODE enum rtx_code
40 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
41 #include "rtl.def" /* rtl expressions are documented here */
44 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
46 Assumes default enum value assignment. */
48 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
49 /* The cast here, saves many elsewhere. */
51 extern int rtx_length[];
52 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
54 extern char *rtx_name[];
55 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
57 extern char *rtx_format[];
58 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
60 extern char rtx_class[];
61 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
63 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
64 relative to which the offsets are calculated, as explained in rtl.def. */
67 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
68 unsigned min_align: 8;
70 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
71 unsigned min_after_vec: 1; /* minimum address target label is after the ADDR_DIFF_VEC. */
72 unsigned max_after_vec: 1; /* maximum address target label is after the ADDR_DIFF_VEC. */
73 unsigned min_after_base: 1; /* minimum address target label is after BASE. */
74 unsigned max_after_base: 1; /* maximum address target label is after BASE. */
75 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
76 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
79 } addr_diff_vec_flags;
81 /* Common union for an element of an rtx. */
83 typedef union rtunion_def
89 struct rtvec_def *rtvec;
90 enum machine_mode rttype;
91 addr_diff_vec_flags rt_addr_diff_vec_flags;
92 struct bitmap_head_def *rtbit;
93 union tree_node *rttree;
94 struct basic_block_def *bb;
97 /* RTL expression ("rtx"). */
99 typedef struct rtx_def
101 #ifdef ONLY_INT_FIELDS
102 #ifdef CODE_FIELD_BUG
103 unsigned int code : 16;
108 /* The kind of expression this is. */
109 enum rtx_code code : 16;
111 /* The kind of value the expression has. */
112 #ifdef ONLY_INT_FIELDS
115 enum machine_mode mode : 8;
117 /* LINK_COST_ZERO in an INSN_LIST. */
118 unsigned int jump : 1;
119 /* LINK_COST_FREE in an INSN_LIST. */
120 unsigned int call : 1;
121 /* 1 in a MEM or REG if value of this expression will never change
122 during the current function, even though it is not
124 1 in a SUBREG if it is from a promoted variable that is unsigned.
125 1 in a SYMBOL_REF if it addresses something in the per-function
127 1 in a CALL_INSN if it is a const call.
128 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
129 reorg until end of compilation; cleared before used. */
130 unsigned int unchanging : 1;
131 /* 1 in a MEM expression if contents of memory are volatile.
132 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
134 1 in a REG expression if corresponds to a variable declared by the user.
135 0 for an internally generated temporary.
136 In a SYMBOL_REF, this flag is used for machine-specific purposes.
137 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
138 unsigned int volatil : 1;
139 /* 1 in a MEM referring to a field of an aggregate.
140 0 if the MEM was a variable or the result of a * operator in C;
141 1 if it was the result of a . or -> operator (on a struct) in C.
142 1 in a REG if the register is used only in exit code a loop.
143 1 in a SUBREG expression if was generated from a variable with a
145 1 in a CODE_LABEL if the label is used for nonlocal gotos
146 and must not be deleted even if its count is zero.
147 1 in a LABEL_REF if this is a reference to a label outside the
149 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
150 together with the preceding insn. Valid only within sched.
151 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
152 from the target of a branch. Valid from reorg until end of compilation;
153 cleared before used. */
154 unsigned int in_struct : 1;
155 /* 1 if this rtx is used. This is used for copying shared structure.
156 See `unshare_all_rtl'.
157 In a REG, this is not needed for that purpose, and used instead
158 in `leaf_renumber_regs_insn'.
159 In a SYMBOL_REF, means that emit_library_call
160 has used it as the function. */
161 unsigned int used : 1;
162 /* Nonzero if this rtx came from procedure integration.
163 In a REG, nonzero means this reg refers to the return value
164 of the current function. */
165 unsigned integrated : 1;
166 /* 1 in an INSN or a SET if this rtx is related to the call frame,
167 either changing how we compute the frame address or saving and
168 restoring registers in the prologue and epilogue.
169 1 in a MEM if the MEM refers to a scalar, rather than a member of
171 unsigned frame_related : 1;
172 /* The first element of the operands of this rtx.
173 The number of operands and their types are controlled
174 by the `code' field, according to rtl.def. */
178 #define NULL_RTX (rtx) 0
180 /* Define macros to access the `code' field of the rtx. */
182 #ifdef SHORT_ENUM_BUG
183 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
184 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
186 #define GET_CODE(RTX) ((RTX)->code)
187 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
190 #define GET_MODE(RTX) ((RTX)->mode)
191 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
193 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
194 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
195 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
197 /* RTL vector. These appear inside RTX's when there is a need
198 for a variable number of things. The principle use is inside
199 PARALLEL expressions. */
201 typedef struct rtvec_def{
202 int num_elem; /* number of elements */
206 #define NULL_RTVEC (rtvec) 0
208 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
209 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
211 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
213 /* 1 if X is a REG. */
215 #define REG_P(X) (GET_CODE (X) == REG)
217 /* 1 if X is a constant value that is an integer. */
219 #define CONSTANT_P(X) \
220 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
221 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
222 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
223 || GET_CODE (X) == CONSTANT_P_RTX)
225 /* General accessor macros for accessing the fields of an rtx. */
227 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
228 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
229 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
230 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
231 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
232 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
233 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
234 #define XBITMAP(RTX, N) ((RTX)->fld[N].rtbit)
235 #define XTREE(RTX, N) ((RTX)->fld[N].rttree)
238 /* ACCESS MACROS for particular fields of insns. */
240 /* Holds a unique number for each insn.
241 These are not necessarily sequentially increasing. */
242 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
244 /* Chain insns together in sequence. */
245 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
246 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
248 /* The body of an insn. */
249 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
251 /* Code number of instruction, from when it was recognized.
252 -1 means this instruction has not been recognized yet. */
253 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
255 /* Set up in flow.c; empty before then.
256 Holds a chain of INSN_LIST rtx's whose first operands point at
257 previous insns with direct data-flow connections to this one.
258 That means that those insns set variables whose next use is in this insn.
259 They are always in the same basic block as this insn. */
260 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
262 /* 1 if insn has been deleted. */
263 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
265 /* 1 if insn is a call to a const function. */
266 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
268 /* 1 if insn is a branch that should not unconditionally execute its
269 delay slots, i.e., it is an annulled branch. */
270 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
272 /* 1 if insn is in a delay slot and is from the target of the branch. If
273 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
274 executed if the branch is taken. For annulled branches with this bit
275 clear, the insn should be executed only if the branch is not taken. */
276 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
278 /* Holds a list of notes on what this insn does to various REGs.
279 It is a chain of EXPR_LIST rtx's, where the second operand
280 is the chain pointer and the first operand is the REG being described.
281 The mode field of the EXPR_LIST contains not a real machine mode
282 but a value that says what this note says about the REG:
283 REG_DEAD means that the value in REG dies in this insn (i.e., it is
284 not needed past this insn). If REG is set in this insn, the REG_DEAD
285 note may, but need not, be omitted.
286 REG_INC means that the REG is autoincremented or autodecremented.
287 REG_EQUIV describes the insn as a whole; it says that the insn
288 sets a register to a constant value or to be equivalent to a memory
289 address. If the register is spilled to the stack then the constant
290 value should be substituted for it. The contents of the REG_EQUIV
291 is the constant value or memory address, which may be different
292 from the source of the SET although it has the same value. A
293 REG_EQUIV note may also appear on an insn which copies a register
294 parameter to a pseudo-register, if there is a memory address which
295 could be used to hold that pseudo-register throughout the function.
296 REG_EQUAL is like REG_EQUIV except that the destination
297 is only momentarily equal to the specified rtx. Therefore, it
298 cannot be used for substitution; but it can be used for cse.
299 REG_RETVAL means that this insn copies the return-value of
300 a library call out of the hard reg for return values. This note
301 is actually an INSN_LIST and it points to the first insn involved
302 in setting up arguments for the call. flow.c uses this to delete
303 the entire library call when its result is dead.
304 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
305 of the library call and points at the one that has the REG_RETVAL.
306 REG_WAS_0 says that the register set in this insn held 0 before the insn.
307 The contents of the note is the insn that stored the 0.
308 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
309 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
310 REG_NONNEG means that the register is always nonnegative during
311 the containing loop. This is used in branches so that decrement and
312 branch instructions terminating on zero can be matched. There must be
313 an insn pattern in the md file named `decrement_and_branch_until_zero'
314 or else this will never be added to any instructions.
315 REG_NO_CONFLICT means there is no conflict *after this insn*
316 between the register in the note and the destination of this insn.
317 REG_UNUSED identifies a register set in this insn and never used.
318 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
319 CC0, respectively. Normally, these are required to be consecutive insns,
320 but we permit putting a cc0-setting insn in the delay slot of a branch
321 as long as only one copy of the insn exists. In that case, these notes
322 point from one to the other to allow code generation to determine what
323 any require information and to properly update CC_STATUS.
324 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
325 say that the CODE_LABEL contained in the REG_LABEL note is used
327 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
328 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
329 (write after write) dependencies. Data dependencies, which are the only
330 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
331 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
332 -fbranch-probabilities is given. It has an integer value. For jumps,
333 it is the probability that this is a taken branch. For calls, it is the
334 probability that this call won't return.
335 REG_EXEC_COUNT is attached to the first insn of each basic block, and
336 the first insn after each CALL_INSN. It indicates how many times this
338 REG_SAVE_AREA is used to optimize rtl generated by dynamic stack
339 allocations for targets where SETJMP_VIA_SAVE_AREA is true.
340 REG_BR_PRED is attached to JUMP_INSNs only, it holds the branch prediction
341 flags computed by get_jump_flags() after dbr scheduling is complete.
342 REG_FRAME_RELATED_EXPR is attached to insns that are RTX_FRAME_RELATED_P,
343 but are too complex for DWARF to interpret what they imply. The attached
344 rtx is used instead of intuition. */
345 /* REG_EH_REGION is used to indicate what exception region an INSN
346 belongs in. This can be used to indicate what region a call may throw
347 to. a REGION of 0 indicates that a call cannot throw at all.
348 a REGION of -1 indicates that it cannot throw, nor will it execute
350 REG_EH_RETHROW is used to indicate that a call is actually a
351 call to rethrow, and specifies the rethrow symbol for the region
352 the rethrow is targetting. This provides a way to generate the
353 non standard flow edges required for a rethrow. */
356 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
358 #define ADDR_DIFF_VEC_FLAGS(RTX) ((RTX)->fld[4].rt_addr_diff_vec_flags)
360 /* Don't forget to change reg_note_name in rtl.c. */
361 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
362 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
363 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
364 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
365 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15, REG_BR_PROB = 16,
366 REG_EXEC_COUNT = 17, REG_NOALIAS = 18, REG_SAVE_AREA = 19,
367 REG_BR_PRED = 20, REG_EH_CONTEXT = 21,
368 REG_FRAME_RELATED_EXPR = 22, REG_EH_REGION = 23,
369 REG_EH_RETHROW = 24 };
370 /* The base value for branch probability notes. */
371 #define REG_BR_PROB_BASE 10000
373 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
374 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
375 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
377 /* Names for REG_NOTE's in EXPR_LIST insn's. */
379 extern char *reg_note_name[];
380 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
382 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
383 USE and CLOBBER expressions.
384 USE expressions list the registers filled with arguments that
385 are passed to the function.
386 CLOBBER expressions document the registers explicitly clobbered
388 Pseudo registers can not be mentioned in this list. */
389 #define CALL_INSN_FUNCTION_USAGE(INSN) ((INSN)->fld[7].rtx)
391 /* The label-number of a code-label. The assembler label
392 is made from `L' and the label-number printed in decimal.
393 Label numbers are unique in a compilation. */
394 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
396 #define LINE_NUMBER NOTE
398 /* In a NOTE that is a line number, this is a string for the file name that the
399 line is in. We use the same field to record block numbers temporarily in
400 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
401 between ints and pointers if we use a different macro for the block number.)
402 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
403 information as a rtx in the field. */
405 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
406 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
407 #define NOTE_RANGE_INFO(INSN) ((INSN)->fld[3].rtx)
408 #define NOTE_LIVE_INFO(INSN) ((INSN)->fld[3].rtx)
409 #define NOTE_BASIC_BLOCK(INSN) ((INSN)->fld[3].bb)
411 /* If the NOTE_BLOCK_NUMBER field gets a -1, it means create a new
412 block node for a live range block. */
413 #define NOTE_BLOCK_LIVE_RANGE_BLOCK -1
415 /* In a NOTE that is a line number, this is the line number.
416 Other kinds of NOTEs are identified by negative numbers here. */
417 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
419 /* Codes that appear in the NOTE_LINE_NUMBER field
420 for kinds of notes that are not line numbers.
422 Notice that we do not try to use zero here for any of
423 the special note codes because sometimes the source line
424 actually can be zero! This happens (for example) when we
425 are generating code for the per-translation-unit constructor
426 and destructor routines for some C++ translation unit.
428 If you should change any of the following values, or if you
429 should add a new value here, don't forget to change the
430 note_insn_name array in rtl.c. */
432 /* This note is used to get rid of an insn
433 when it isn't safe to patch the insn out of the chain. */
434 #define NOTE_INSN_DELETED -1
435 #define NOTE_INSN_BLOCK_BEG -2
436 #define NOTE_INSN_BLOCK_END -3
437 #define NOTE_INSN_LOOP_BEG -4
438 #define NOTE_INSN_LOOP_END -5
439 /* This kind of note is generated at the end of the function body,
440 just before the return insn or return label.
441 In an optimizing compilation it is deleted by the first jump optimization,
442 after enabling that optimizer to determine whether control can fall
443 off the end of the function body without a return statement. */
444 #define NOTE_INSN_FUNCTION_END -6
445 /* This kind of note is generated just after each call to `setjmp', et al. */
446 #define NOTE_INSN_SETJMP -7
447 /* Generated at the place in a loop that `continue' jumps to. */
448 #define NOTE_INSN_LOOP_CONT -8
449 /* Generated at the start of a duplicated exit test. */
450 #define NOTE_INSN_LOOP_VTOP -9
451 /* This marks the point immediately after the last prologue insn. */
452 #define NOTE_INSN_PROLOGUE_END -10
453 /* This marks the point immediately prior to the first epilogue insn. */
454 #define NOTE_INSN_EPILOGUE_BEG -11
455 /* Generated in place of user-declared labels when they are deleted. */
456 #define NOTE_INSN_DELETED_LABEL -12
457 /* This note indicates the start of the real body of the function,
458 i.e. the point just after all of the parms have been moved into
460 #define NOTE_INSN_FUNCTION_BEG -13
461 /* These note where exception handling regions begin and end. */
462 #define NOTE_INSN_EH_REGION_BEG -14
463 #define NOTE_INSN_EH_REGION_END -15
464 /* Generated whenever a duplicate line number note is output. For example,
465 one is output after the end of an inline function, in order to prevent
466 the line containing the inline call from being counted twice in gcov. */
467 #define NOTE_REPEATED_LINE_NUMBER -16
469 /* Start/end of a live range region, where pseudos allocated on the stack can
470 be allocated to temporary registers. */
471 #define NOTE_INSN_RANGE_START -17
472 #define NOTE_INSN_RANGE_END -18
473 /* Record which registers are currently live. */
474 #define NOTE_INSN_LIVE -19
475 /* Record the struct for the following basic block. */
476 #define NOTE_INSN_BASIC_BLOCK -20
478 #if 0 /* These are not used, and I don't know what they were for. --rms. */
479 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
480 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
481 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
482 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
483 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
486 /* Names for NOTE insn's other than line numbers. */
488 extern char *note_insn_name[];
489 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
491 /* The name of a label, in case it corresponds to an explicit label
492 in the input source code. */
493 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
495 /* In jump.c, each label contains a count of the number
496 of LABEL_REFs that point at it, so unused labels can be deleted. */
497 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
499 /* The original regno this ADDRESSOF was built for. */
500 #define ADDRESSOF_REGNO(RTX) ((RTX)->fld[1].rtint)
502 /* The variable in the register we took the address of. */
503 #define ADDRESSOF_DECL(X) ((tree) XEXP ((X), 2))
504 #define SET_ADDRESSOF_DECL(X, T) (XEXP ((X), 2) = (rtx) (T))
506 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
507 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
508 be decremented and possibly the label can be deleted. */
509 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
511 /* Once basic blocks are found in flow.c,
512 each CODE_LABEL starts a chain that goes through
513 all the LABEL_REFs that jump to that label.
514 The chain eventually winds up at the CODE_LABEL; it is circular. */
515 #define LABEL_REFS(LABEL) ((LABEL)->fld[6].rtx)
517 /* This is the field in the LABEL_REF through which the circular chain
518 of references to a particular label is linked.
519 This chain is set up in flow.c. */
521 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
523 /* Once basic blocks are found in flow.c,
524 Each LABEL_REF points to its containing instruction with this field. */
526 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
528 /* For a REG rtx, REGNO extracts the register number. */
530 #define REGNO(RTX) ((RTX)->fld[0].rtint)
532 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
533 is the current function's return value. */
535 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
537 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
538 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
540 /* For a CONST_INT rtx, INTVAL extracts the integer. */
542 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
544 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
545 SUBREG_WORD extracts the word-number. */
547 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
548 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
550 /* 1 if the REG contained in SUBREG_REG is already known to be
551 sign- or zero-extended from the mode of the SUBREG to the mode of
552 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
555 When used as a LHS, is means that this extension must be done
556 when assigning to SUBREG_REG. */
558 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
559 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
561 /* Access various components of an ASM_OPERANDS rtx. */
563 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
564 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
565 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
566 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
567 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
568 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
569 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
570 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
571 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
572 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
573 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
575 /* For a MEM rtx, 1 if it's a volatile reference.
576 Also in an ASM_OPERANDS rtx. */
577 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
579 /* For a MEM rtx, 1 if it refers to a field of an aggregate. If zero,
580 RTX may or may not refer to a field of an aggregate. */
581 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
583 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
584 not refer to a scalar.*/
585 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
587 /* Copy the MEM_VOLATILE_P, MEM_IN_STRUCT_P, and MEM_SCALAR_P
588 attributes from RHS to LHS. */
589 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
590 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
591 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
592 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS))
594 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
595 RTX. Otherwise, vice versa. Use this macro only when you are
596 *sure* that you know that the MEM is in a structure, or is a
597 scalar. VAL is evaluated only once. */
598 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
599 ((VAL) ? (MEM_IN_STRUCT_P (RTX) = 1, MEM_SCALAR_P (RTX) = 0) \
600 : (MEM_IN_STRUCT_P (RTX) = 0, MEM_SCALAR_P (RTX) = 1))
602 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
603 set, and may alias anything. Otherwise, the MEM can only alias
604 MEMs in the same alias set. This value is set in a
605 language-dependent manner in the front-end, and should not be
606 altered in the back-end. These set numbers are tested for zero,
607 and compared for equality; they have no other significance. In
608 some front-ends, these numbers may correspond in some way to types,
609 or other language-level entities, but they need not, and the
610 back-end makes no such assumptions. */
611 #define MEM_ALIAS_SET(RTX) (XINT (RTX, 1))
613 /* For a LABEL_REF, 1 means that this reference is to a label outside the
614 loop containing the reference. */
615 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
617 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
618 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
619 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
621 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
622 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
624 /* For a REG, 1 means the register is used only in an exit test of a loop. */
625 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
627 /* During sched, for an insn, 1 means that the insn must be scheduled together
628 with the preceding insn. */
629 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
631 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
632 cost of the dependence link. The cost of executing an instruction
633 may vary based on how the results are used. LINK_COST_ZERO is 1 when
634 the cost through the link varies and is unchanged (i.e., the link has
635 zero additional cost). LINK_COST_FREE is 1 when the cost through the
636 link is zero (i.e., the link makes the cost free). In other cases,
637 the adjustment to the cost is recomputed each time it is needed. */
638 #define LINK_COST_ZERO(X) ((X)->jump)
639 #define LINK_COST_FREE(X) ((X)->call)
641 /* For a SET rtx, SET_DEST is the place that is set
642 and SET_SRC is the value it is set to. */
643 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
644 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
646 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
647 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
648 #define TRAP_CODE(RTX) (RTX)->fld[1].rtx
650 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
651 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
653 /* Flag in a SYMBOL_REF for machine-specific purposes. */
654 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
656 /* 1 in a SYMBOL_REF if it represents a symbol which might have to change
657 if its inlined or unrolled. */
658 #define SYMBOL_REF_NEED_ADJUST(RTX) ((RTX)->in_struct)
660 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
661 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
663 /* Define a macro to look for REG_INC notes,
664 but save time on machines where they never exist. */
666 /* Don't continue this line--convex cc version 4.1 would lose. */
667 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
668 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
670 #define FIND_REG_INC_NOTE(insn, reg) 0
673 /* Indicate whether the machine has any sort of auto increment addressing.
674 If not, we can avoid checking for REG_INC notes. */
676 /* Don't continue this line--convex cc version 4.1 would lose. */
677 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
681 #ifndef HAVE_PRE_INCREMENT
682 #define HAVE_PRE_INCREMENT 0
685 #ifndef HAVE_PRE_DECREMENT
686 #define HAVE_PRE_DECREMENT 0
689 #ifndef HAVE_POST_INCREMENT
690 #define HAVE_POST_INCREMENT 0
693 #ifndef HAVE_POST_DECREMENT
694 #define HAVE_POST_DECREMENT 0
698 /* Some architectures do not have complete pre/post increment/decrement
699 instruction sets, or only move some modes efficiently. These macros
700 allow us to tune autoincrement generation. */
702 #ifndef USE_LOAD_POST_INCREMENT
703 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
706 #ifndef USE_LOAD_POST_DECREMENT
707 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
710 #ifndef USE_LOAD_PRE_INCREMENT
711 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
714 #ifndef USE_LOAD_PRE_DECREMENT
715 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
718 #ifndef USE_STORE_POST_INCREMENT
719 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
722 #ifndef USE_STORE_POST_DECREMENT
723 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
726 #ifndef USE_STORE_PRE_INCREMENT
727 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
730 #ifndef USE_STORE_PRE_DECREMENT
731 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
735 /* Accessors for RANGE_INFO. */
736 /* For RANGE_{START,END} notes return the RANGE_START note. */
737 #define RANGE_INFO_NOTE_START(INSN) (XEXP (INSN, 0))
739 /* For RANGE_{START,END} notes return the RANGE_START note. */
740 #define RANGE_INFO_NOTE_END(INSN) (XEXP (INSN, 1))
742 /* For RANGE_{START,END} notes, return the vector containing the registers used
744 #define RANGE_INFO_REGS(INSN) (XVEC (INSN, 2))
745 #define RANGE_INFO_REGS_REG(INSN, N) (XVECEXP (INSN, 2, N))
746 #define RANGE_INFO_NUM_REGS(INSN) (XVECLEN (INSN, 2))
748 /* For RANGE_{START,END} notes, the number of calls within the range. */
749 #define RANGE_INFO_NCALLS(INSN) (XINT (INSN, 3))
751 /* For RANGE_{START,END} notes, the number of insns within the range. */
752 #define RANGE_INFO_NINSNS(INSN) (XINT (INSN, 4))
754 /* For RANGE_{START,END} notes, a unique # to identify this range. */
755 #define RANGE_INFO_UNIQUE(INSN) (XINT (INSN, 5))
757 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
758 #define RANGE_INFO_BB_START(INSN) (XINT (INSN, 6))
760 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
761 #define RANGE_INFO_BB_END(INSN) (XINT (INSN, 7))
763 /* For RANGE_{START,END} notes, the loop depth the range is in. */
764 #define RANGE_INFO_LOOP_DEPTH(INSN) (XINT (INSN, 8))
766 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
768 #define RANGE_INFO_LIVE_START(INSN) (XBITMAP (INSN, 9))
770 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
772 #define RANGE_INFO_LIVE_END(INSN) (XBITMAP (INSN, 10))
774 /* For RANGE_START notes, the marker # of the start of the range. */
775 #define RANGE_INFO_MARKER_START(INSN) (XINT (INSN, 11))
777 /* For RANGE_START notes, the marker # of the end of the range. */
778 #define RANGE_INFO_MARKER_END(INSN) (XINT (INSN, 12))
780 /* Original pseudo register # for a live range note. */
781 #define RANGE_REG_PSEUDO(INSN,N) (XINT (XVECEXP (INSN, 2, N), 0))
783 /* Pseudo register # original register is copied into or -1. */
784 #define RANGE_REG_COPY(INSN,N) (XINT (XVECEXP (INSN, 2, N), 1))
786 /* How many times a register in a live range note was referenced. */
787 #define RANGE_REG_REFS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 2))
789 /* How many times a register in a live range note was set. */
790 #define RANGE_REG_SETS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 3))
792 /* How many times a register in a live range note died. */
793 #define RANGE_REG_DEATHS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 4))
795 /* Whether the original value is needed to be copied into the range register at
796 the start of the range. */
797 #define RANGE_REG_COPY_FLAGS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 5))
799 /* # of insns the register copy is live over. */
800 #define RANGE_REG_LIVE_LENGTH(INSN,N) (XINT (XVECEXP (INSN, 2, N), 6))
802 /* # of calls the register copy is live over. */
803 #define RANGE_REG_N_CALLS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 7))
805 /* DECL_NODE pointer of the declaration if the register is a user defined
807 #define RANGE_REG_SYMBOL_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 8))
809 /* BLOCK_NODE pointer to the block the variable is declared in if the
810 register is a user defined variable. */
811 #define RANGE_REG_BLOCK_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 9))
813 /* EXPR_LIST of the distinct ranges a variable is in. */
814 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
816 /* Block a variable is declared in. */
817 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
819 /* # of distinct ranges a variable is in. */
820 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
822 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
823 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
825 /* For a NOTE_INSN_LIVE note, the original basic block number. */
826 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
828 /* Generally useful functions. */
830 /* The following functions accept a wide integer argument. Rather than
831 having to cast on every function call, we use a macro instead, that is
832 defined here and in tree.h. */
835 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
836 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
838 extern int exact_log2_wide PROTO((unsigned HOST_WIDE_INT));
839 extern int floor_log2_wide PROTO((unsigned HOST_WIDE_INT));
842 extern int ceil_log2 PROTO((unsigned HOST_WIDE_INT));
844 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
846 #define plus_constant_for_output(X,C) \
847 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
850 extern HOST_WIDE_INT trunc_int_for_mode PROTO((HOST_WIDE_INT,
852 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
853 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
854 extern void optimize_save_area_alloca PROTO((rtx));
856 extern rtx gen_rtx PVPROTO((enum rtx_code,
857 enum machine_mode, ...));
858 extern rtvec gen_rtvec PVPROTO((int, ...));
861 extern rtx read_rtx PROTO((FILE *));
864 extern char *oballoc PROTO((int));
865 extern char *permalloc PROTO((int));
866 extern rtx rtx_alloc PROTO((RTX_CODE));
867 extern rtvec rtvec_alloc PROTO((int));
868 extern rtx copy_rtx PROTO((rtx));
869 extern rtx copy_rtx_if_shared PROTO((rtx));
870 extern rtx copy_most_rtx PROTO((rtx, rtx));
871 extern rtx shallow_copy_rtx PROTO((rtx));
872 extern rtvec gen_rtvec_v PROTO((int, rtx *));
873 extern rtvec gen_rtvec_vv PROTO((int, rtunion *));
874 extern rtx gen_reg_rtx PROTO((enum machine_mode));
875 extern rtx gen_label_rtx PROTO((void));
876 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
877 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
878 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
879 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
880 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
881 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
882 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
883 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
884 extern int subreg_lowpart_p PROTO((rtx));
885 extern rtx make_safe_from PROTO((rtx, rtx));
886 extern rtx convert_memory_address PROTO((enum machine_mode, rtx));
887 extern rtx memory_address PROTO((enum machine_mode, rtx));
888 extern rtx get_insns PROTO((void));
889 extern rtx get_last_insn PROTO((void));
890 extern rtx get_last_insn_anywhere PROTO((void));
891 extern void start_sequence PROTO((void));
892 extern void push_to_sequence PROTO((rtx));
893 extern void end_sequence PROTO((void));
894 extern rtx gen_sequence PROTO((void));
895 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
896 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
897 extern rtx force_reg PROTO((enum machine_mode, rtx));
898 extern rtx get_pool_constant PROTO((rtx));
899 extern enum machine_mode get_pool_mode PROTO((rtx));
900 extern int get_pool_offset PROTO((rtx));
901 extern rtx simplify_subtraction PROTO((rtx));
902 extern rtx assign_stack_local PROTO((enum machine_mode,
903 HOST_WIDE_INT, int));
904 extern rtx assign_stack_temp PROTO((enum machine_mode,
905 HOST_WIDE_INT, int));
906 extern rtx assign_temp PROTO((union tree_node *,
908 extern rtx protect_from_queue PROTO((rtx, int));
909 extern void emit_queue PROTO((void));
910 extern rtx emit_move_insn PROTO((rtx, rtx));
911 extern rtx emit_insn_before PROTO((rtx, rtx));
912 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
913 extern rtx emit_call_insn_before PROTO((rtx, rtx));
914 extern rtx emit_barrier_before PROTO((rtx));
915 extern rtx emit_label_before PROTO((rtx, rtx));
916 extern rtx emit_note_before PROTO((int, rtx));
917 extern rtx emit_insn_after PROTO((rtx, rtx));
918 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
919 extern rtx emit_barrier_after PROTO((rtx));
920 extern rtx emit_label_after PROTO((rtx, rtx));
921 extern rtx emit_note_after PROTO((int, rtx));
922 extern rtx emit_line_note_after PROTO((char *, int, rtx));
923 extern rtx emit_insn PROTO((rtx));
924 extern rtx emit_insns PROTO((rtx));
925 extern rtx emit_insns_before PROTO((rtx, rtx));
926 extern rtx emit_insns_after PROTO((rtx, rtx));
927 extern rtx emit_jump_insn PROTO((rtx));
928 extern rtx emit_call_insn PROTO((rtx));
929 extern rtx emit_label PROTO((rtx));
930 extern rtx emit_barrier PROTO((void));
931 extern rtx emit_line_note PROTO((char *, int));
932 extern rtx emit_note PROTO((char *, int));
933 extern rtx emit_line_note_force PROTO((char *, int));
934 extern rtx make_insn_raw PROTO((rtx));
935 extern rtx previous_insn PROTO((rtx));
936 extern rtx next_insn PROTO((rtx));
937 extern rtx prev_nonnote_insn PROTO((rtx));
938 extern rtx next_nonnote_insn PROTO((rtx));
939 extern rtx prev_real_insn PROTO((rtx));
940 extern rtx next_real_insn PROTO((rtx));
941 extern rtx prev_active_insn PROTO((rtx));
942 extern rtx next_active_insn PROTO((rtx));
943 extern rtx prev_label PROTO((rtx));
944 extern rtx next_label PROTO((rtx));
945 extern rtx next_cc0_user PROTO((rtx));
946 extern rtx prev_cc0_setter PROTO((rtx));
947 extern rtx next_nondeleted_insn PROTO((rtx));
948 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
949 extern enum rtx_code swap_condition PROTO((enum rtx_code));
950 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
951 extern enum rtx_code signed_condition PROTO((enum rtx_code));
952 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
953 extern rtx squeeze_notes PROTO((rtx, rtx));
954 extern rtx delete_insn PROTO((rtx));
955 extern void delete_jump PROTO((rtx));
956 extern rtx get_label_before PROTO((rtx));
957 extern rtx get_label_after PROTO((rtx));
958 extern rtx follow_jumps PROTO((rtx));
959 extern rtx adj_offsettable_operand PROTO((rtx, int));
960 extern rtx try_split PROTO((rtx, rtx, int));
961 extern rtx split_insns PROTO((rtx, rtx));
962 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
963 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
964 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
965 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
966 extern rtx gen_move_insn PROTO((rtx, rtx));
967 extern rtx gen_jump PROTO((rtx));
968 extern rtx gen_beq PROTO((rtx));
969 extern rtx gen_bge PROTO((rtx));
970 extern rtx gen_ble PROTO((rtx));
971 extern rtx gen_mem_addressof PROTO((rtx, union tree_node *));
972 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
973 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
974 extern enum machine_mode choose_hard_reg_mode PROTO((int, int));
975 extern void set_unique_reg_note PROTO((rtx, enum reg_note, rtx));
977 /* Functions in rtlanal.c */
979 extern int rtx_unstable_p PROTO((rtx));
980 extern int rtx_varies_p PROTO((rtx));
981 extern int rtx_addr_varies_p PROTO((rtx));
982 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
983 extern rtx get_related_value PROTO((rtx));
984 extern int reg_mentioned_p PROTO((rtx, rtx));
985 extern int reg_referenced_p PROTO((rtx, rtx));
986 extern int reg_used_between_p PROTO((rtx, rtx, rtx));
987 extern int reg_referenced_between_p PROTO((rtx, rtx, rtx));
988 extern int reg_set_between_p PROTO((rtx, rtx, rtx));
989 extern int regs_set_between_p PROTO((rtx, rtx, rtx));
990 extern int modified_between_p PROTO((rtx, rtx, rtx));
991 extern int no_labels_between_p PROTO((rtx, rtx));
992 extern int no_jumps_between_p PROTO((rtx, rtx));
993 extern int modified_in_p PROTO((rtx, rtx));
994 extern int reg_set_p PROTO((rtx, rtx));
995 extern rtx single_set PROTO((rtx));
996 extern int multiple_sets PROTO((rtx));
997 extern rtx find_last_value PROTO((rtx, rtx *, rtx, int));
998 extern int refers_to_regno_p PROTO((int, int, rtx, rtx *));
999 extern int reg_overlap_mentioned_p PROTO((rtx, rtx));
1000 extern void note_stores PROTO((rtx, void (*)(rtx, rtx)));
1001 extern rtx reg_set_last PROTO((rtx, rtx));
1002 extern int rtx_equal_p PROTO((rtx, rtx));
1003 extern int dead_or_set_p PROTO((rtx, rtx));
1004 extern int dead_or_set_regno_p PROTO((rtx, int));
1005 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
1006 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
1007 extern int find_reg_fusage PROTO((rtx, enum rtx_code, rtx));
1008 extern int find_regno_fusage PROTO((rtx, enum rtx_code, int));
1009 extern void remove_note PROTO((rtx, rtx));
1010 extern int side_effects_p PROTO((rtx));
1011 extern int volatile_refs_p PROTO((rtx));
1012 extern int volatile_insn_p PROTO((rtx));
1013 extern int may_trap_p PROTO((rtx));
1014 extern int inequality_comparisons_p PROTO ((rtx));
1015 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
1016 extern rtx replace_regs PROTO((rtx, rtx *, int, int));
1017 extern int computed_jump_p PROTO((rtx));
1018 typedef int (*rtx_function) PROTO((rtx *, void *));
1019 extern int for_each_rtx PROTO((rtx *, rtx_function, void *));
1020 extern rtx regno_use_in PROTO((int, rtx));
1021 extern int auto_inc_p PROTO((rtx));
1022 extern void remove_node_from_expr_list PROTO((rtx, rtx *));
1026 extern rtx find_use_as_address PROTO((rtx, rtx, HOST_WIDE_INT));
1030 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1031 Always at least 3, since the combiner could put that many togetherm
1032 and we want this to remain correct for all the remaining passes. */
1034 extern int max_parallel;
1036 /* Free up register info memory. */
1037 extern void free_reg_info PROTO((void));
1040 extern int asm_noperands PROTO((rtx));
1041 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **,
1043 enum machine_mode *));
1045 extern enum reg_class reg_preferred_class PROTO((int));
1046 extern enum reg_class reg_alternate_class PROTO((int));
1048 extern rtx get_first_nonparm_insn PROTO((void));
1050 extern void split_block_insns PROTO((int, int));
1051 extern void update_flow_info PROTO((rtx, rtx, rtx, rtx));
1053 /* Standard pieces of rtx, to be substituted directly into things. */
1054 #define pc_rtx (&global_rtl.pc_val)
1055 #define cc0_rtx (&global_rtl.cc0_val)
1057 #define MAX_SAVED_CONST_INT 64
1058 extern struct rtx_def const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1060 #define const0_rtx (&const_int_rtx[MAX_SAVED_CONST_INT])
1061 #define const1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+1])
1062 #define const2_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+2])
1063 #define constm1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT-1])
1064 extern rtx const_true_rtx;
1066 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1068 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1069 same as VOIDmode. */
1071 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1073 /* Likewise, for the constants 1 and 2. */
1075 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1076 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1078 extern struct _global_rtl
1080 struct rtx_def pc_val, cc0_val;
1081 struct rtx_def stack_pointer_val, frame_pointer_val;
1082 struct rtx_def hard_frame_pointer_val;
1083 struct rtx_def arg_pointer_val;
1084 struct rtx_def virtual_incoming_args_val;
1085 struct rtx_def virtual_stack_vars_val;
1086 struct rtx_def virtual_stack_dynamic_val;
1087 struct rtx_def virtual_outgoing_args_val;
1088 struct rtx_def virtual_cfa_val;
1091 /* All references to certain hard regs, except those created
1092 by allocating pseudo regs into them (when that's possible),
1093 go through these unique rtx objects. */
1094 #define stack_pointer_rtx (&global_rtl.stack_pointer_val)
1095 #define frame_pointer_rtx (&global_rtl.frame_pointer_val)
1097 extern rtx pic_offset_table_rtx;
1098 extern rtx struct_value_rtx;
1099 extern rtx struct_value_incoming_rtx;
1100 extern rtx static_chain_rtx;
1101 extern rtx static_chain_incoming_rtx;
1102 extern rtx return_address_pointer_rtx;
1104 /* Include the RTL generation functions. */
1110 /* There are some RTL codes that require special attention; the
1111 generation functions included above do the raw handling. If you
1112 add to this list, modify special_rtx in gengenrtl.c as well. You
1113 should also modify gen_rtx to use the special function. */
1115 extern rtx gen_rtx_CONST_DOUBLE PROTO((enum machine_mode, rtx,
1116 HOST_WIDE_INT, HOST_WIDE_INT));
1117 extern rtx gen_rtx_CONST_INT PROTO((enum machine_mode, HOST_WIDE_INT));
1118 extern rtx gen_rtx_REG PROTO((enum machine_mode, int));
1119 extern rtx gen_rtx_MEM PROTO((enum machine_mode, rtx));
1121 /* We need the cast here to ensure that we get the same result both with
1122 and without prototypes. */
1123 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1126 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1127 is used to represent the frame pointer. This is because the
1128 hard frame pointer and the automatic variables are separated by an amount
1129 that cannot be determined until after register allocation. We can assume
1130 that in this case ELIMINABLE_REGS will be defined, one action of which
1131 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1132 #ifndef HARD_FRAME_POINTER_REGNUM
1133 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1136 /* For register elimination to work properly these hard_frame_pointer_rtx,
1137 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1138 the same register. */
1139 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1140 #define hard_frame_pointer_rtx (&global_rtl.frame_pointer_val)
1142 #define hard_frame_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1145 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1146 #define arg_pointer_rtx (&global_rtl.frame_pointer_val)
1148 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1149 #define arg_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1151 #define arg_pointer_rtx (&global_rtl.arg_pointer_val)
1155 /* Virtual registers are used during RTL generation to refer to locations into
1156 the stack frame when the actual location isn't known until RTL generation
1157 is complete. The routine instantiate_virtual_regs replaces these with
1158 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1161 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1163 /* This points to the first word of the incoming arguments passed on the stack,
1164 either by the caller or by the callee when pretending it was passed by the
1167 #define virtual_incoming_args_rtx (&global_rtl.virtual_incoming_args_val)
1169 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1171 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1172 variable on the stack. Otherwise, it points to the first variable on
1175 #define virtual_stack_vars_rtx (&global_rtl.virtual_stack_vars_val)
1177 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1179 /* This points to the location of dynamically-allocated memory on the stack
1180 immediately after the stack pointer has been adjusted by the amount
1183 #define virtual_stack_dynamic_rtx (&global_rtl.virtual_stack_dynamic_val)
1185 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1187 /* This points to the location in the stack at which outgoing arguments should
1188 be written when the stack is pre-pushed (arguments pushed using push
1189 insns always use sp). */
1191 #define virtual_outgoing_args_rtx (&global_rtl.virtual_outgoing_args_val)
1193 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1195 /* This points to the Canonical Frame Address of the function. This
1196 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1197 but is calculated relative to the arg pointer for simplicity; the
1198 frame pointer nor stack pointer are necessarily fixed relative to
1199 the CFA until after reload. */
1201 #define virtual_cfa_rtx (&global_rtl.virtual_cfa_val)
1203 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1205 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1207 extern rtx find_next_ref PROTO((rtx, rtx));
1208 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
1210 extern rtx output_constant_def PROTO((union tree_node *));
1211 extern rtx immed_real_const PROTO((union tree_node *));
1212 extern union tree_node *make_tree PROTO((union tree_node *, rtx));
1214 /* Define a default value for STORE_FLAG_VALUE. */
1216 #ifndef STORE_FLAG_VALUE
1217 #define STORE_FLAG_VALUE 1
1220 /* Nonzero after the second flow pass has completed.
1221 Set to 1 or 0 by toplev.c */
1222 extern int flow2_completed;
1224 /* Nonzero after end of reload pass.
1225 Set to 1 or 0 by reload1.c. */
1227 extern int reload_completed;
1229 /* Set to 1 while reload_as_needed is operating.
1230 Required by some machines to handle any generated moves differently. */
1232 extern int reload_in_progress;
1234 /* If this is nonzero, we do not bother generating VOLATILE
1235 around volatile memory references, and we are willing to
1236 output indirect addresses. If cse is to follow, we reject
1237 indirect addresses so a useful potential cse is generated;
1238 if it is used only once, instruction combination will produce
1239 the same indirect address eventually. */
1240 extern int cse_not_expected;
1242 /* Set to nonzero before life analysis to indicate that it is unsafe to
1243 generate any new pseudo registers. */
1244 extern int no_new_pseudos;
1246 /* Translates rtx code to tree code, for those codes needed by
1247 REAL_ARITHMETIC. The function returns an int because the caller may not
1248 know what `enum tree_code' means. */
1250 extern int rtx_to_tree_code PROTO((enum rtx_code));
1253 extern void obfree PROTO ((char *));
1255 extern void gcc_obstack_init PROTO ((struct obstack *));
1256 extern void pop_obstacks PROTO ((void));
1257 extern void push_obstacks PROTO ((struct obstack *,
1260 extern int read_skip_spaces PROTO ((FILE *));
1264 struct cse_basic_block_data;
1265 extern int rtx_cost PROTO ((rtx, enum rtx_code));
1266 extern void delete_trivially_dead_insns PROTO ((rtx, int));
1268 extern int cse_main PROTO ((rtx, int, int, FILE *));
1270 extern void cse_end_of_basic_block PROTO ((rtx,
1271 struct cse_basic_block_data *,
1275 extern int comparison_dominates_p PROTO ((enum rtx_code, enum rtx_code));
1276 extern int condjump_p PROTO ((rtx));
1277 extern rtx condjump_label PROTO ((rtx));
1278 extern int simplejump_p PROTO ((rtx));
1279 extern int returnjump_p PROTO ((rtx));
1280 extern int onlyjump_p PROTO ((rtx));
1281 extern int sets_cc0_p PROTO ((rtx));
1282 extern int invert_jump PROTO ((rtx, rtx));
1283 extern int rtx_renumbered_equal_p PROTO ((rtx, rtx));
1284 extern int true_regnum PROTO ((rtx));
1285 extern int redirect_jump PROTO ((rtx, rtx));
1286 extern void jump_optimize PROTO ((rtx, int, int, int));
1287 extern void rebuild_jump_labels PROTO ((rtx));
1288 extern void thread_jumps PROTO ((rtx, int, int));
1289 extern int redirect_exp PROTO ((rtx *, rtx, rtx, rtx));
1290 extern int rtx_equal_for_thread_p PROTO ((rtx, rtx, rtx));
1291 extern int invert_exp PROTO ((rtx, rtx));
1292 extern int can_reverse_comparison_p PROTO ((rtx, rtx));
1293 extern void delete_for_peephole PROTO ((rtx, rtx));
1294 extern int condjump_in_parallel_p PROTO ((rtx));
1296 /* Flags for jump_optimize() */
1297 #define JUMP_CROSS_JUMP 1
1298 #define JUMP_NOOP_MOVES 1
1299 #define JUMP_AFTER_REGSCAN 1
1301 /* In emit-rtl.c. */
1302 extern int max_reg_num PROTO ((void));
1303 extern int max_label_num PROTO ((void));
1304 extern int get_first_label_num PROTO ((void));
1305 extern void delete_insns_since PROTO ((rtx));
1306 extern void mark_reg_pointer PROTO ((rtx, int));
1307 extern void mark_user_reg PROTO ((rtx));
1308 extern void reset_used_flags PROTO ((rtx));
1309 extern void reorder_insns PROTO ((rtx, rtx, rtx));
1310 extern int get_max_uid PROTO ((void));
1311 extern int in_sequence_p PROTO ((void));
1312 extern void force_next_line_note PROTO ((void));
1313 extern void clear_emit_caches PROTO ((void));
1314 extern void init_emit PROTO ((void));
1315 extern void init_emit_once PROTO ((int));
1316 extern void push_topmost_sequence PROTO ((void));
1317 extern void pop_topmost_sequence PROTO ((void));
1318 extern int subreg_realpart_p PROTO ((rtx));
1319 extern void reverse_comparison PROTO ((rtx));
1320 extern void set_new_first_and_last_insn PROTO ((rtx, rtx));
1321 extern void set_new_first_and_last_label_num PROTO ((int, int));
1322 extern void set_new_last_label_num PROTO ((int));
1323 extern void unshare_all_rtl PROTO ((rtx));
1324 extern void set_last_insn PROTO ((rtx));
1325 extern void link_cc0_insns PROTO ((rtx));
1326 extern void add_insn PROTO ((rtx));
1327 extern void add_insn_before PROTO ((rtx, rtx));
1328 extern void add_insn_after PROTO ((rtx, rtx));
1329 extern void remove_insn PROTO ((rtx));
1330 extern void reorder_insns_with_line_notes PROTO ((rtx, rtx, rtx));
1331 extern void emit_insn_after_with_line_notes PROTO ((rtx, rtx, rtx));
1332 extern enum rtx_code classify_insn PROTO ((rtx));
1333 extern rtx emit PROTO ((rtx));
1334 /* Query and clear/ restore no_line_numbers. This is used by the
1335 switch / case handling in stmt.c to give proper line numbers in
1336 warnings about unreachable code. */
1337 int force_line_numbers PROTO((void));
1338 void restore_line_number_status PROTO((int old_value));
1340 /* In insn-emit.c */
1341 extern void add_clobbers PROTO ((rtx, int));
1344 extern void combine_instructions PROTO ((rtx, int));
1345 extern int extended_count PROTO ((rtx, enum machine_mode, int));
1346 extern rtx remove_death PROTO ((int, rtx));
1348 extern void dump_combine_stats PROTO ((FILE *));
1349 extern void dump_combine_total_stats PROTO ((FILE *));
1354 extern void schedule_insns PROTO ((FILE *));
1357 extern void fix_sched_param PROTO ((char *, char *));
1360 /* In print-rtl.c */
1361 extern void debug_rtx PROTO ((rtx));
1362 extern void debug_rtx_list PROTO ((rtx, int));
1363 extern rtx debug_rtx_find PROTO ((rtx, int));
1365 extern void print_rtl PROTO ((FILE *, rtx));
1366 extern int print_rtl_single PROTO ((FILE *, rtx));
1367 extern void print_inline_rtx PROTO ((FILE *, rtx, int));
1371 extern void init_loop PROTO ((void));
1372 extern rtx libcall_other_reg PROTO ((rtx, rtx));
1374 extern void loop_optimize PROTO ((rtx, FILE *, int, int));
1376 extern void record_excess_regs PROTO ((rtx, rtx, rtx *));
1379 extern void reposition_prologue_and_epilogue_notes PROTO ((rtx));
1380 extern void thread_prologue_and_epilogue_insns PROTO ((rtx));
1381 extern int prologue_epilogue_contains PROTO ((rtx));
1382 extern void use_variable PROTO ((rtx));
1383 extern HOST_WIDE_INT get_frame_size PROTO ((void));
1384 extern void preserve_rtl_expr_result PROTO ((rtx));
1385 extern void mark_temp_addr_taken PROTO ((rtx));
1386 extern void update_temp_slot_address PROTO ((rtx, rtx));
1387 extern void use_variable_after PROTO ((rtx, rtx));
1388 extern void purge_addressof PROTO ((rtx));
1391 extern int operands_match_p PROTO ((rtx, rtx));
1392 extern int safe_from_earlyclobber PROTO ((rtx, rtx));
1395 extern void set_file_and_line_for_stmt PROTO ((char *, int));
1396 extern void expand_null_return PROTO((void));
1397 extern void emit_jump PROTO ((rtx));
1398 extern int preserve_subexpressions_p PROTO ((void));
1401 extern void init_expr_once PROTO ((void));
1402 extern void move_by_pieces PROTO ((rtx, rtx, int, int));
1407 extern void stupid_life_analysis PROTO ((rtx, int, FILE *));
1411 extern void allocate_bb_life_data PROTO ((void));
1412 extern void allocate_reg_life_data PROTO ((void));
1413 extern void recompute_reg_usage PROTO ((rtx, int));
1415 extern void dump_flow_info PROTO ((FILE *));
1417 extern void free_bb_mem PROTO ((void));
1420 extern void init_expmed PROTO ((void));
1421 extern void expand_inc PROTO ((rtx, rtx));
1422 extern void expand_dec PROTO ((rtx, rtx));
1423 extern rtx expand_mult_highpart PROTO ((enum machine_mode, rtx,
1424 unsigned HOST_WIDE_INT, rtx,
1429 extern int gcse_main PROTO ((rtx, FILE *));
1433 extern void mark_elimination PROTO ((int, int));
1435 extern int global_alloc PROTO ((FILE *));
1436 extern void dump_global_regs PROTO ((FILE *));
1439 extern void retry_global_alloc PROTO ((int, HARD_REG_SET));
1443 extern int reg_classes_intersect_p PROTO ((enum reg_class, enum reg_class));
1444 extern int reg_class_subset_p PROTO ((enum reg_class, enum reg_class));
1445 extern void globalize_reg PROTO ((int));
1446 extern void init_regs PROTO ((void));
1447 extern void init_reg_sets PROTO ((void));
1448 extern void regset_release_memory PROTO ((void));
1449 extern void regclass_init PROTO ((void));
1450 extern void regclass PROTO ((rtx, int));
1451 extern void reg_scan PROTO ((rtx, int, int));
1452 extern void reg_scan_update PROTO ((rtx, rtx, int));
1453 extern void fix_register PROTO ((char *, int, int));
1457 extern void regmove_optimize PROTO ((rtx, int, FILE *));
1462 extern void dbr_schedule PROTO ((rtx, FILE *));
1466 extern void init_optabs PROTO ((void));
1468 /* In local-alloc.c */
1470 extern void dump_local_alloc PROTO ((FILE *));
1472 extern int local_alloc PROTO ((void));
1473 extern int function_invariant_p PROTO ((rtx));
1476 extern void reload_cse_regs PROTO ((rtx));
1477 extern void init_reload PROTO ((void));
1478 extern void mark_home_live PROTO ((int));
1480 extern int reload PROTO ((rtx, int, FILE *));
1483 /* In caller-save.c */
1484 extern void init_caller_save PROTO ((void));
1487 extern void init_branch_prob PROTO ((const char *));
1489 extern void branch_prob PROTO ((rtx, FILE *));
1490 extern void end_branch_prob PROTO ((FILE *));
1492 extern void output_func_start_profiler PROTO ((void));
1494 /* In reg-stack.c */
1496 extern void reg_to_stack PROTO ((rtx, FILE *));
1498 extern int stack_regs_mentioned_p PROTO ((rtx));
1500 /* In fold-const.c */
1501 extern int add_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1502 HOST_WIDE_INT, HOST_WIDE_INT,
1503 HOST_WIDE_INT *, HOST_WIDE_INT *));
1504 extern int neg_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1505 HOST_WIDE_INT *, HOST_WIDE_INT *));
1506 extern int mul_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1507 HOST_WIDE_INT, HOST_WIDE_INT,
1508 HOST_WIDE_INT *, HOST_WIDE_INT *));
1509 extern void lshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1510 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1511 HOST_WIDE_INT *, int));
1512 extern void rshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1514 HOST_WIDE_INT *, HOST_WIDE_INT *, int));
1515 extern void lrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1516 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1518 extern void rrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1519 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1523 /* Emit library call. */
1524 extern void emit_library_call PVPROTO ((rtx, int, enum machine_mode,
1526 extern rtx emit_library_call_value PVPROTO((rtx, rtx, int,
1531 extern int set_dominates_use PROTO ((int, int, int, rtx, rtx));
1534 extern void bss_section PROTO ((void));
1535 extern int in_data_section PROTO ((void));
1536 extern int supports_one_only PROTO ((void));
1539 extern void init_rtl PROTO ((void));
1540 extern void rtx_free PROTO ((rtx));
1543 extern int true_dependence PROTO ((rtx, enum machine_mode, rtx,
1545 extern int read_dependence PROTO ((rtx, rtx));
1546 extern int anti_dependence PROTO ((rtx, rtx));
1547 extern int output_dependence PROTO ((rtx, rtx));
1548 extern void init_alias_once PROTO ((void));
1549 extern void init_alias_analysis PROTO ((void));
1550 extern void end_alias_analysis PROTO ((void));
1552 extern void record_base_value PROTO ((int, rtx, int));
1553 extern void record_alias_subset PROTO ((int, int));
1554 extern rtx addr_side_effect_eval PROTO ((rtx, int, int));
1557 extern int stack_regs_mentioned PROTO((rtx insn));