1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 91-96, 1997 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. */
24 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
25 #undef FLOAT /* Likewise. */
26 #undef ABS /* Likewise. */
27 #undef PC /* Likewise. */
33 /* Register Transfer Language EXPRESSIONS CODES */
35 #define RTX_CODE enum rtx_code
38 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
39 #include "rtl.def" /* rtl expressions are documented here */
42 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
44 Assumes default enum value assignment. */
46 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
47 /* The cast here, saves many elsewhere. */
49 extern int rtx_length[];
50 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
52 extern char *rtx_name[];
53 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
55 extern char *rtx_format[];
56 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
58 extern char rtx_class[];
59 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
61 /* Common union for an element of an rtx. */
63 typedef union rtunion_def
69 struct rtvec_def *rtvec;
70 enum machine_mode rttype;
73 /* RTL expression ("rtx"). */
75 typedef struct rtx_def
77 #ifdef ONLY_INT_FIELDS
79 unsigned int code : 16;
84 /* The kind of expression this is. */
85 enum rtx_code code : 16;
87 /* The kind of value the expression has. */
88 #ifdef ONLY_INT_FIELDS
91 enum machine_mode mode : 8;
93 /* 1 in an INSN if it can alter flow of control
94 within this function. Not yet used! */
95 unsigned int jump : 1;
96 /* 1 in an INSN if it can call another function. Not yet used! */
97 unsigned int call : 1;
98 /* 1 in a MEM or REG if value of this expression will never change
99 during the current function, even though it is not
101 1 in a SUBREG if it is from a promoted variable that is unsigned.
102 1 in a SYMBOL_REF if it addresses something in the per-function
104 1 in a CALL_INSN if it is a const call.
105 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
106 reorg until end of compilation; cleared before used. */
107 unsigned int unchanging : 1;
108 /* 1 in a MEM expression if contents of memory are volatile.
109 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
111 1 in a REG expression if corresponds to a variable declared by the user.
112 0 for an internally generated temporary.
113 In a SYMBOL_REF, this flag is used for machine-specific purposes.
114 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
115 unsigned int volatil : 1;
116 /* 1 in a MEM referring to a field of a structure (not a union!).
117 0 if the MEM was a variable or the result of a * operator in C;
118 1 if it was the result of a . or -> operator (on a struct) in C.
119 1 in a REG if the register is used only in exit code a loop.
120 1 in a SUBREG expression if was generated from a variable with a
122 1 in a CODE_LABEL if the label is used for nonlocal gotos
123 and must not be deleted even if its count is zero.
124 1 in a LABEL_REF if this is a reference to a label outside the
126 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
127 together with the preceding insn. Valid only within sched.
128 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
129 from the target of a branch. Valid from reorg until end of compilation;
130 cleared before used. */
131 unsigned int in_struct : 1;
132 /* 1 if this rtx is used. This is used for copying shared structure.
133 See `unshare_all_rtl'.
134 In a REG, this is not needed for that purpose, and used instead
135 in `leaf_renumber_regs_insn'.
136 In a SYMBOL_REF, means that emit_library_call
137 has used it as the function. */
138 unsigned int used : 1;
139 /* Nonzero if this rtx came from procedure integration.
140 In a REG, nonzero means this reg refers to the return value
141 of the current function. */
142 unsigned integrated : 1;
143 /* Nonzero if this rtx is related to the call frame, either changing how
144 we compute the frame address or saving and restoring registers in
145 the prologue and epilogue. */
146 unsigned frame_related : 1;
147 /* The first element of the operands of this rtx.
148 The number of operands and their types are controlled
149 by the `code' field, according to rtl.def. */
153 #include "gansidecl.h"
155 #define NULL_RTX (rtx) 0
157 /* Define macros to access the `code' field of the rtx. */
159 #ifdef SHORT_ENUM_BUG
160 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
161 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
163 #define GET_CODE(RTX) ((RTX)->code)
164 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
167 #define GET_MODE(RTX) ((RTX)->mode)
168 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
170 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
171 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
172 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
174 /* RTL vector. These appear inside RTX's when there is a need
175 for a variable number of things. The principle use is inside
176 PARALLEL expressions. */
178 typedef struct rtvec_def{
179 int num_elem; /* number of elements */
183 #define NULL_RTVEC (rtvec) 0
185 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
186 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
188 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
190 /* 1 if X is a REG. */
192 #define REG_P(X) (GET_CODE (X) == REG)
194 /* 1 if X is a constant value that is an integer. */
196 #define CONSTANT_P(X) \
197 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
198 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
199 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
201 /* General accessor macros for accessing the fields of an rtx. */
203 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
204 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
205 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
206 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
207 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
208 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
209 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
211 /* ACCESS MACROS for particular fields of insns. */
213 /* Holds a unique number for each insn.
214 These are not necessarily sequentially increasing. */
215 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
217 /* Chain insns together in sequence. */
218 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
219 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
221 /* The body of an insn. */
222 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
224 /* Code number of instruction, from when it was recognized.
225 -1 means this instruction has not been recognized yet. */
226 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
228 /* Set up in flow.c; empty before then.
229 Holds a chain of INSN_LIST rtx's whose first operands point at
230 previous insns with direct data-flow connections to this one.
231 That means that those insns set variables whose next use is in this insn.
232 They are always in the same basic block as this insn. */
233 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
235 /* 1 if insn has been deleted. */
236 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
238 /* 1 if insn is a call to a const function. */
239 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
241 /* 1 if insn is a branch that should not unconditionally execute its
242 delay slots, i.e., it is an annulled branch. */
243 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
245 /* 1 if insn is in a delay slot and is from the target of the branch. If
246 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
247 executed if the branch is taken. For annulled branches with this bit
248 clear, the insn should be executed only if the branch is not taken. */
249 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
251 /* Holds a list of notes on what this insn does to various REGs.
252 It is a chain of EXPR_LIST rtx's, where the second operand
253 is the chain pointer and the first operand is the REG being described.
254 The mode field of the EXPR_LIST contains not a real machine mode
255 but a value that says what this note says about the REG:
256 REG_DEAD means that the value in REG dies in this insn (i.e., it is
257 not needed past this insn). If REG is set in this insn, the REG_DEAD
258 note may, but need not, be omitted.
259 REG_INC means that the REG is autoincremented or autodecremented.
260 REG_EQUIV describes the insn as a whole; it says that the insn
261 sets a register to a constant value or to be equivalent to a memory
262 address. If the register is spilled to the stack then the constant
263 value should be substituted for it. The contents of the REG_EQUIV
264 is the constant value or memory address, which may be different
265 from the source of the SET although it has the same value. A
266 REG_EQUIV note may also appear on an insn which copies a register
267 parameter to a pseudo-register, if there is a memory address which
268 could be used to hold that pseudo-register throughout the function.
269 REG_EQUAL is like REG_EQUIV except that the destination
270 is only momentarily equal to the specified rtx. Therefore, it
271 cannot be used for substitution; but it can be used for cse.
272 REG_RETVAL means that this insn copies the return-value of
273 a library call out of the hard reg for return values. This note
274 is actually an INSN_LIST and it points to the first insn involved
275 in setting up arguments for the call. flow.c uses this to delete
276 the entire library call when its result is dead.
277 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
278 of the library call and points at the one that has the REG_RETVAL.
279 REG_WAS_0 says that the register set in this insn held 0 before the insn.
280 The contents of the note is the insn that stored the 0.
281 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
282 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
283 REG_NONNEG means that the register is always nonnegative during
284 the containing loop. This is used in branches so that decrement and
285 branch instructions terminating on zero can be matched. There must be
286 an insn pattern in the md file named `decrement_and_branch_until_zero'
287 or else this will never be added to any instructions.
288 REG_NO_CONFLICT means there is no conflict *after this insn*
289 between the register in the note and the destination of this insn.
290 REG_UNUSED identifies a register set in this insn and never used.
291 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
292 CC0, respectively. Normally, these are required to be consecutive insns,
293 but we permit putting a cc0-setting insn in the delay slot of a branch
294 as long as only one copy of the insn exists. In that case, these notes
295 point from one to the other to allow code generation to determine what
296 any require information and to properly update CC_STATUS.
297 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
298 say that the CODE_LABEL contained in the REG_LABEL note is used
300 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
301 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
302 (write after write) dependencies. Data dependencies, which are the only
303 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
304 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
305 -fbranch-probabilities is given. It has an integer value. For jumps,
306 it is the probability that this is a taken branch. For calls, it is the
307 probability that this call won't return.
308 REG_EXEC_COUNT is attached to the first insn of each basic block, and
309 the first insn after each CALL_INSN. It indicates how many times this
311 REG_SAVE_AREA is used to optimize rtl generated by dynamic stack
312 allocations for targets where SETJMP_VIA_SAVE_AREA is true.
313 REG_BR_PRED is attached to JUMP_INSNs only, it holds the branch prediction
314 flags computed by get_jump_flags() after dbr scheduling is complete. */
317 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
319 /* Don't forget to change reg_note_name in rtl.c. */
320 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
321 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
322 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
323 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
324 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15, REG_BR_PROB = 16,
325 REG_EXEC_COUNT = 17, REG_NOALIAS = 18, REG_SAVE_AREA = 19,
327 /* The base value for branch probability notes. */
328 #define REG_BR_PROB_BASE 10000
330 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
331 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
332 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
334 /* Names for REG_NOTE's in EXPR_LIST insn's. */
336 extern char *reg_note_name[];
337 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
339 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
340 USE and CLOBBER expressions.
341 USE expressions list the registers filled with arguments that
342 are passed to the function.
343 CLOBBER expressions document the registers explicitly clobbered
345 Pseudo registers can not be mentioned in this list. */
346 #define CALL_INSN_FUNCTION_USAGE(INSN) ((INSN)->fld[7].rtx)
348 /* The label-number of a code-label. The assembler label
349 is made from `L' and the label-number printed in decimal.
350 Label numbers are unique in a compilation. */
351 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
353 #define LINE_NUMBER NOTE
355 /* In a NOTE that is a line number, this is a string for the file name
356 that the line is in. We use the same field to record block numbers
357 temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
358 (We avoid lots of casts between ints and pointers if we use a
359 different macro for the bock number.) */
361 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
362 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
364 /* In a NOTE that is a line number, this is the line number.
365 Other kinds of NOTEs are identified by negative numbers here. */
366 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
368 /* Codes that appear in the NOTE_LINE_NUMBER field
369 for kinds of notes that are not line numbers.
371 Notice that we do not try to use zero here for any of
372 the special note codes because sometimes the source line
373 actually can be zero! This happens (for example) when we
374 are generating code for the per-translation-unit constructor
375 and destructor routines for some C++ translation unit.
377 If you should change any of the following values, or if you
378 should add a new value here, don't forget to change the
379 note_insn_name array in rtl.c. */
381 /* This note is used to get rid of an insn
382 when it isn't safe to patch the insn out of the chain. */
383 #define NOTE_INSN_DELETED -1
384 #define NOTE_INSN_BLOCK_BEG -2
385 #define NOTE_INSN_BLOCK_END -3
386 #define NOTE_INSN_LOOP_BEG -4
387 #define NOTE_INSN_LOOP_END -5
388 /* This kind of note is generated at the end of the function body,
389 just before the return insn or return label.
390 In an optimizing compilation it is deleted by the first jump optimization,
391 after enabling that optimizer to determine whether control can fall
392 off the end of the function body without a return statement. */
393 #define NOTE_INSN_FUNCTION_END -6
394 /* This kind of note is generated just after each call to `setjmp', et al. */
395 #define NOTE_INSN_SETJMP -7
396 /* Generated at the place in a loop that `continue' jumps to. */
397 #define NOTE_INSN_LOOP_CONT -8
398 /* Generated at the start of a duplicated exit test. */
399 #define NOTE_INSN_LOOP_VTOP -9
400 /* This marks the point immediately after the last prologue insn. */
401 #define NOTE_INSN_PROLOGUE_END -10
402 /* This marks the point immediately prior to the first epilogue insn. */
403 #define NOTE_INSN_EPILOGUE_BEG -11
404 /* Generated in place of user-declared labels when they are deleted. */
405 #define NOTE_INSN_DELETED_LABEL -12
406 /* This note indicates the start of the real body of the function,
407 i.e. the point just after all of the parms have been moved into
409 #define NOTE_INSN_FUNCTION_BEG -13
410 /* These note where exception handling regions begin and end. */
411 #define NOTE_INSN_EH_REGION_BEG -14
412 #define NOTE_INSN_EH_REGION_END -15
413 /* Generated whenever a duplicate line number note is output. For example,
414 one is output after the end of an inline function, in order to prevent
415 the line containing the inline call from being counted twice in gcov. */
416 #define NOTE_REPEATED_LINE_NUMBER -16
419 #if 0 /* These are not used, and I don't know what they were for. --rms. */
420 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
421 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
422 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
423 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
424 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
427 /* Names for NOTE insn's other than line numbers. */
429 extern char *note_insn_name[];
430 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
432 /* The name of a label, in case it corresponds to an explicit label
433 in the input source code. */
434 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
436 /* In jump.c, each label contains a count of the number
437 of LABEL_REFs that point at it, so unused labels can be deleted. */
438 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
440 /* The rest is used instead of the above, in a CODE_LABEL,
441 if bytecode is being output.
442 We make the slightly kludgy assumption that a LABEL has enough slots
443 to hold these things. That happens to be true. */
445 /* For static or external objects. */
446 #define BYTECODE_LABEL(X) (XSTR ((X), 0))
448 /* For goto labels inside bytecode functions. */
449 #define BYTECODE_BC_LABEL(X) (*(struct bc_label **) &XEXP ((X), 1))
451 /* The original regno this ADDRESSOF was built for. */
452 #define ADDRESSOF_REGNO(RTX) ((RTX)->fld[1].rtint)
454 /* The variable in the register we took the address of. */
455 #define ADDRESSOF_DECL(X) ((tree) XEXP ((X), 2))
456 #define SET_ADDRESSOF_DECL(X, T) (XEXP ((X), 2) = (rtx) (T))
458 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
459 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
460 be decremented and possibly the label can be deleted. */
461 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
463 /* Once basic blocks are found in flow.c,
464 each CODE_LABEL starts a chain that goes through
465 all the LABEL_REFs that jump to that label.
466 The chain eventually winds up at the CODE_LABEL; it is circular. */
467 #define LABEL_REFS(LABEL) ((LABEL)->fld[6].rtx)
469 /* This is the field in the LABEL_REF through which the circular chain
470 of references to a particular label is linked.
471 This chain is set up in flow.c. */
473 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
475 /* Once basic blocks are found in flow.c,
476 Each LABEL_REF points to its containing instruction with this field. */
478 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
480 /* For a REG rtx, REGNO extracts the register number. */
482 #define REGNO(RTX) ((RTX)->fld[0].rtint)
484 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
485 is the current function's return value. */
487 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
489 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
490 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
492 /* For a CONST_INT rtx, INTVAL extracts the integer. */
494 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
496 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
497 SUBREG_WORD extracts the word-number. */
499 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
500 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
502 /* 1 if the REG contained in SUBREG_REG is already known to be
503 sign- or zero-extended from the mode of the SUBREG to the mode of
504 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
507 When used as a LHS, is means that this extension must be done
508 when assigning to SUBREG_REG. */
510 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
511 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
513 /* Access various components of an ASM_OPERANDS rtx. */
515 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
516 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
517 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
518 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
519 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
520 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
521 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
522 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
523 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
524 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
525 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
527 /* For a MEM rtx, 1 if it's a volatile reference.
528 Also in an ASM_OPERANDS rtx. */
529 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
531 /* For a MEM rtx, 1 if it refers to a structure or union component. */
532 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
534 /* For a LABEL_REF, 1 means that this reference is to a label outside the
535 loop containing the reference. */
536 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
538 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
539 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
540 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
542 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
543 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
545 /* For a REG, 1 means the register is used only in an exit test of a loop. */
546 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
548 /* During sched, for an insn, 1 means that the insn must be scheduled together
549 with the preceding insn. */
550 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
552 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
553 cost of the dependence link. The cost of executing an instruction
554 may vary based on how the results are used. LINK_COST_ZERO is 1 when
555 the cost through the link varies and is unchanged (i.e., the link has
556 zero additional cost). LINK_COST_FREE is 1 when the cost through the
557 link is zero (i.e., the link makes the cost free). In other cases,
558 the adjustment to the cost is recomputed each time it is needed. */
559 #define LINK_COST_ZERO(X) ((X)->jump)
560 #define LINK_COST_FREE(X) ((X)->call)
562 /* For a SET rtx, SET_DEST is the place that is set
563 and SET_SRC is the value it is set to. */
564 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
565 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
567 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
568 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
570 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
571 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
573 /* Flag in a SYMBOL_REF for machine-specific purposes. */
574 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
576 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
577 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
579 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
580 of the function that is not involved in copying parameters to
581 pseudo-registers. FIRST_PARM_INSN is the very first insn of
582 the function, including the parameter copying.
583 We keep this around in case we must splice
584 this function into the assembly code at the end of the file.
585 FIRST_LABELNO is the first label number used by the function (inclusive).
586 LAST_LABELNO is the last label used by the function (exclusive).
587 MAX_REGNUM is the largest pseudo-register used by that function.
588 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
589 POPS_ARGS is the number of bytes of input arguments popped by the function
590 STACK_SLOT_LIST is the list of stack slots.
591 FORCED_LABELS is the list of labels whose address was taken.
592 FUNCTION_FLAGS are where single-bit flags are saved.
593 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
594 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
595 for the function arguments.
596 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
598 INLINE_REGNO_REG_RTX, INLINE_REGNO_POINTER_FLAG, and
599 INLINE_REGNO_POINTER_ALIGN are pointers to the corresponding arrays.
601 We want this to lay down like an INSN. The PREV_INSN field
602 is always NULL. The NEXT_INSN field always points to the
603 first function insn of the function being squirreled away. */
605 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
606 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
607 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
608 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
609 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
610 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
611 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
612 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
613 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
614 #define FORCED_LABELS(RTX) ((RTX)->fld[11].rtx)
615 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[12].rtint)
616 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[13].rtint)
617 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[14].rtvec)
618 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[15].rtx)
619 #define INLINE_REGNO_REG_RTX(RTX) ((RTX)->fld[16].rtvec)
620 #define INLINE_REGNO_POINTER_FLAG(RTX) ((RTX)->fld[17].rtstr)
621 #define INLINE_REGNO_POINTER_ALIGN(RTX) ((RTX)->fld[18].rtstr)
622 #define PARMREG_STACK_LOC(RTX) ((RTX)->fld[19].rtvec)
624 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
625 for the function and which must be `or'ed into the current flag values when
626 insns from that function are being inlined. */
628 /* These ought to be an enum, but non-ANSI compilers don't like that. */
629 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
630 #define FUNCTION_FLAGS_CALLS_SETJMP 02
631 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
632 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
633 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
634 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
635 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
636 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
637 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
638 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
640 /* Define a macro to look for REG_INC notes,
641 but save time on machines where they never exist. */
643 /* Don't continue this line--convex cc version 4.1 would lose. */
644 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
645 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
647 #define FIND_REG_INC_NOTE(insn, reg) 0
650 /* Indicate whether the machine has any sort of auto increment addressing.
651 If not, we can avoid checking for REG_INC notes. */
653 /* Don't continue this line--convex cc version 4.1 would lose. */
654 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
658 /* Generally useful functions. */
660 /* The following functions accept a wide integer argument. Rather than
661 having to cast on every function call, we use a macro instead, that is
662 defined here and in tree.h. */
665 #define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
666 #define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
669 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
671 #define plus_constant_for_output(X,C) \
672 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
674 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
675 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
677 #define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (HOST_WIDE_INT) (N))
679 extern rtx bc_gen_rtx ();
681 extern rtx gen_rtx PVPROTO((enum rtx_code,
682 enum machine_mode, ...));
683 extern rtvec gen_rtvec PVPROTO((int, ...));
686 extern rtx read_rtx PROTO((FILE *));
690 /* At present, don't prototype xrealloc, since all of the callers don't
691 cast their pointers to char *, and all of the xrealloc's don't use
693 extern char *xmalloc PROTO((size_t));
694 extern char *xrealloc PROTO((void *, size_t));
696 extern char *xmalloc ();
697 extern char *xrealloc ();
700 extern char *oballoc PROTO((int));
701 extern char *permalloc PROTO((int));
702 #ifdef NEED_DECLARATION_FREE
703 extern void free PROTO((void *));
705 extern rtx rtx_alloc PROTO((RTX_CODE));
706 extern rtvec rtvec_alloc PROTO((int));
707 extern rtx copy_rtx PROTO((rtx));
708 extern rtx copy_rtx_if_shared PROTO((rtx));
709 extern rtx copy_most_rtx PROTO((rtx, rtx));
710 extern rtvec gen_rtvec_v PROTO((int, rtx *));
711 extern rtvec gen_rtvec_vv PROTO((int, rtunion *));
712 extern rtx gen_reg_rtx PROTO((enum machine_mode));
713 extern rtx gen_label_rtx PROTO((void));
714 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int,
715 int, int, rtx, rtx, int, int,
717 rtvec, char *, char *, rtvec));
718 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
719 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
720 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
721 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
722 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
723 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
724 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
725 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
726 extern int subreg_lowpart_p PROTO((rtx));
727 extern rtx make_safe_from PROTO((rtx, rtx));
728 extern rtx convert_memory_address PROTO((enum machine_mode, rtx));
729 extern rtx memory_address PROTO((enum machine_mode, rtx));
730 extern rtx get_insns PROTO((void));
731 extern rtx get_last_insn PROTO((void));
732 extern rtx get_last_insn_anywhere PROTO((void));
733 extern void start_sequence PROTO((void));
734 extern void push_to_sequence PROTO((rtx));
735 extern void end_sequence PROTO((void));
736 extern rtx gen_sequence PROTO((void));
737 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
738 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
739 extern rtx force_reg PROTO((enum machine_mode, rtx));
740 extern rtx get_pool_constant PROTO((rtx));
741 extern enum machine_mode get_pool_mode PROTO((rtx));
742 extern int get_pool_offset PROTO((rtx));
743 extern rtx simplify_subtraction PROTO((rtx));
744 extern rtx assign_stack_local PROTO((enum machine_mode, int, int));
745 extern rtx assign_stack_temp PROTO((enum machine_mode, int, int));
746 extern rtx assign_temp PROTO((union tree_node *, int,
748 extern rtx protect_from_queue PROTO((rtx, int));
749 extern void emit_queue PROTO((void));
750 extern rtx emit_move_insn PROTO((rtx, rtx));
751 extern rtx emit_insn_before PROTO((rtx, rtx));
752 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
753 extern rtx emit_call_insn_before PROTO((rtx, rtx));
754 extern rtx emit_barrier_before PROTO((rtx));
755 extern rtx emit_note_before PROTO((int, rtx));
756 extern rtx emit_insn_after PROTO((rtx, rtx));
757 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
758 extern rtx emit_barrier_after PROTO((rtx));
759 extern rtx emit_label_after PROTO((rtx, rtx));
760 extern rtx emit_note_after PROTO((int, rtx));
761 extern rtx emit_line_note_after PROTO((char *, int, rtx));
762 extern rtx emit_insn PROTO((rtx));
763 extern rtx emit_insns PROTO((rtx));
764 extern rtx emit_insns_before PROTO((rtx, rtx));
765 extern rtx emit_insns_after PROTO((rtx, rtx));
766 extern rtx emit_jump_insn PROTO((rtx));
767 extern rtx emit_call_insn PROTO((rtx));
768 extern rtx emit_label PROTO((rtx));
769 extern rtx emit_barrier PROTO((void));
770 extern rtx emit_line_note PROTO((char *, int));
771 extern rtx emit_note PROTO((char *, int));
772 extern rtx emit_line_note_force PROTO((char *, int));
773 extern rtx make_insn_raw PROTO((rtx));
774 extern rtx previous_insn PROTO((rtx));
775 extern rtx next_insn PROTO((rtx));
776 extern rtx prev_nonnote_insn PROTO((rtx));
777 extern rtx next_nonnote_insn PROTO((rtx));
778 extern rtx prev_real_insn PROTO((rtx));
779 extern rtx next_real_insn PROTO((rtx));
780 extern rtx prev_active_insn PROTO((rtx));
781 extern rtx next_active_insn PROTO((rtx));
782 extern rtx prev_label PROTO((rtx));
783 extern rtx next_label PROTO((rtx));
784 extern rtx next_cc0_user PROTO((rtx));
785 extern rtx prev_cc0_setter PROTO((rtx));
786 extern rtx next_nondeleted_insn PROTO((rtx));
787 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
788 extern enum rtx_code swap_condition PROTO((enum rtx_code));
789 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
790 extern enum rtx_code signed_condition PROTO((enum rtx_code));
791 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
792 extern rtx squeeze_notes PROTO((rtx, rtx));
793 extern rtx delete_insn PROTO((rtx));
794 extern void delete_jump PROTO((rtx));
795 extern rtx get_label_before PROTO((rtx));
796 extern rtx get_label_after PROTO((rtx));
797 extern rtx follow_jumps PROTO((rtx));
798 extern rtx adj_offsettable_operand PROTO((rtx, int));
799 extern rtx try_split PROTO((rtx, rtx, int));
800 extern rtx split_insns PROTO((rtx, rtx));
801 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
802 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
803 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
804 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
805 extern rtx nonlocal_label_rtx_list PROTO((void));
806 extern rtx gen_move_insn PROTO((rtx, rtx));
807 extern rtx gen_jump PROTO((rtx));
808 extern rtx gen_beq PROTO((rtx));
809 extern rtx gen_bge PROTO((rtx));
810 extern rtx gen_ble PROTO((rtx));
811 extern rtx gen_mem_addressof PROTO((rtx, union tree_node *));
812 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
813 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
814 extern enum machine_mode choose_hard_reg_mode PROTO((int, int));
815 extern int rtx_varies_p PROTO((rtx));
816 extern int may_trap_p PROTO((rtx));
817 extern int side_effects_p PROTO((rtx));
818 extern int volatile_refs_p PROTO((rtx));
819 extern int volatile_insn_p PROTO((rtx));
820 extern void remove_note PROTO((rtx, rtx));
821 extern void note_stores PROTO((rtx, void (*)()));
822 extern int refers_to_regno_p PROTO((int, int, rtx, rtx *));
823 extern int reg_overlap_mentioned_p PROTO((rtx, rtx));
824 extern rtx find_use_as_address PROTO((rtx, rtx, HOST_WIDE_INT));
826 /* Functions in rtlanal.c */
828 extern int rtx_unstable_p PROTO((rtx));
829 extern int rtx_varies_p PROTO((rtx));
830 extern int rtx_addr_varies_p PROTO((rtx));
831 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
832 extern rtx get_related_value PROTO((rtx));
833 extern int reg_mentioned_p PROTO((rtx, rtx));
834 extern int reg_referenced_p PROTO((rtx, rtx));
835 extern int reg_used_between_p PROTO((rtx, rtx, rtx));
836 extern int reg_referenced_between_p PROTO((rtx, rtx, rtx));
837 extern int reg_set_between_p PROTO((rtx, rtx, rtx));
838 extern int modified_between_p PROTO((rtx, rtx, rtx));
839 extern int no_labels_between_p PROTO((rtx, rtx));
840 extern int modified_in_p PROTO((rtx, rtx));
841 extern int reg_set_p PROTO((rtx, rtx));
842 extern rtx single_set PROTO((rtx));
843 extern rtx find_last_value PROTO((rtx, rtx *, rtx));
844 extern int refers_to_regno_p PROTO((int, int, rtx, rtx *));
845 extern int reg_overlap_mentioned_p PROTO((rtx, rtx));
846 extern void note_stores PROTO((rtx, void (*)()));
847 extern rtx reg_set_last PROTO((rtx, rtx));
848 extern int rtx_equal_p PROTO((rtx, rtx));
849 extern int dead_or_set_p PROTO((rtx, rtx));
850 extern int dead_or_set_regno_p PROTO((rtx, int));
851 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
852 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
853 extern int find_reg_fusage PROTO((rtx, enum rtx_code, rtx));
854 extern int find_regno_fusage PROTO((rtx, enum rtx_code, int));
855 extern void remove_note PROTO((rtx, rtx));
856 extern int side_effects_p PROTO((rtx));
857 extern int volatile_refs_p PROTO((rtx));
858 extern int volatile_insn_p PROTO((rtx));
859 extern int may_trap_p PROTO((rtx));
860 extern int inequality_comparison_p PROTO((rtx));
861 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
862 extern rtx replace_regs PROTO((rtx, rtx *, int, int));
864 /* Maximum number of parallel sets and clobbers in any insn in this fn.
865 Always at least 3, since the combiner could put that many togetherm
866 and we want this to remain correct for all the remaining passes. */
868 extern int max_parallel;
870 extern int asm_noperands PROTO((rtx));
871 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
873 extern enum reg_class reg_preferred_class PROTO((int));
874 extern enum reg_class reg_alternate_class PROTO((int));
876 extern rtx get_first_nonparm_insn PROTO((void));
878 /* Standard pieces of rtx, to be substituted directly into things. */
881 extern rtx const0_rtx;
882 extern rtx const1_rtx;
883 extern rtx const2_rtx;
884 extern rtx constm1_rtx;
885 extern rtx const_true_rtx;
887 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
889 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
892 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
894 /* Likewise, for the constants 1 and 2. */
896 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
897 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
899 /* All references to certain hard regs, except those created
900 by allocating pseudo regs into them (when that's possible),
901 go through these unique rtx objects. */
902 extern rtx stack_pointer_rtx;
903 extern rtx frame_pointer_rtx;
904 extern rtx hard_frame_pointer_rtx;
905 extern rtx arg_pointer_rtx;
906 extern rtx pic_offset_table_rtx;
907 extern rtx struct_value_rtx;
908 extern rtx struct_value_incoming_rtx;
909 extern rtx static_chain_rtx;
910 extern rtx static_chain_incoming_rtx;
912 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
913 is used to represent the frame pointer. This is because the
914 hard frame pointer and the automatic variables are separated by an amount
915 that cannot be determined until after register allocation. We can assume
916 that in this case ELIMINABLE_REGS will be defined, one action of which
917 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
918 #ifndef HARD_FRAME_POINTER_REGNUM
919 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
922 /* Virtual registers are used during RTL generation to refer to locations into
923 the stack frame when the actual location isn't known until RTL generation
924 is complete. The routine instantiate_virtual_regs replaces these with
925 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
928 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
930 /* This points to the first word of the incoming arguments passed on the stack,
931 either by the caller or by the callee when pretending it was passed by the
934 extern rtx virtual_incoming_args_rtx;
936 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
938 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
939 variable on the stack. Otherwise, it points to the first variable on
942 extern rtx virtual_stack_vars_rtx;
944 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
946 /* This points to the location of dynamically-allocated memory on the stack
947 immediately after the stack pointer has been adjusted by the amount
950 extern rtx virtual_stack_dynamic_rtx;
952 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
954 /* This points to the location in the stack at which outgoing arguments should
955 be written when the stack is pre-pushed (arguments pushed using push
956 insns always use sp). */
958 extern rtx virtual_outgoing_args_rtx;
960 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
962 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
964 extern rtx find_next_ref PROTO((rtx, rtx));
965 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
967 /* It is hard to write the prototype for expand_expr, since it needs
968 expr.h to be included for the enumeration. */
970 extern rtx expand_expr ();
972 extern rtx output_constant_def PROTO((union tree_node *));
973 extern rtx immed_real_const PROTO((union tree_node *));
974 extern union tree_node *make_tree PROTO((union tree_node *, rtx));
977 extern void fatal_insn_not_found PROTO((rtx));
978 extern void fatal_insn PROTO((char *, rtx));
980 /* Define a default value for STORE_FLAG_VALUE. */
982 #ifndef STORE_FLAG_VALUE
983 #define STORE_FLAG_VALUE 1
986 /* Nonzero after end of reload pass.
987 Set to 1 or 0 by toplev.c. */
989 extern int reload_completed;
991 /* Set to 1 while reload_as_needed is operating.
992 Required by some machines to handle any generated moves differently. */
994 extern int reload_in_progress;
996 /* If this is nonzero, we do not bother generating VOLATILE
997 around volatile memory references, and we are willing to
998 output indirect addresses. If cse is to follow, we reject
999 indirect addresses so a useful potential cse is generated;
1000 if it is used only once, instruction combination will produce
1001 the same indirect address eventually. */
1002 extern int cse_not_expected;
1004 /* Indexed by pseudo register number, gives the rtx for that pseudo.
1005 Allocated in parallel with regno_pointer_flag. */
1006 extern rtx *regno_reg_rtx;
1008 /* Vector indexed by regno; contains the alignment in bytes for a
1009 register that contains a pointer, if known. */
1010 extern char *regno_pointer_align;
1011 #define REGNO_POINTER_ALIGN(REGNO) regno_pointer_align[REGNO]
1013 /* Translates rtx code to tree code, for those codes needed by
1014 REAL_ARITHMETIC. The function returns an int because the caller may not
1015 know what `enum tree_code' means. */
1017 extern int rtx_to_tree_code PROTO((enum rtx_code));
1019 extern int true_dependence PROTO((rtx, enum machine_mode, rtx, int (*)()));
1020 extern int read_dependence PROTO((rtx, rtx));
1021 extern int anti_dependence PROTO((rtx, rtx));
1022 extern int output_dependence PROTO((rtx, rtx));
1023 extern void init_alias_analysis PROTO((void));
1024 extern void end_alias_analysis PROTO((void));
1025 extern void mark_user_reg PROTO((rtx));
1026 extern void mark_reg_pointer PROTO((rtx, int));
1027 extern int computed_jump_p PROTO((rtx));