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 /* 1 in an INSN if it can alter flow of control
118 within this function. Not yet used! */
119 unsigned int jump : 1;
120 /* 1 in an INSN if it can call another function. Not yet used! */
121 unsigned int call : 1;
122 /* 1 in a MEM or REG if value of this expression will never change
123 during the current function, even though it is not
125 1 in a SUBREG if it is from a promoted variable that is unsigned.
126 1 in a SYMBOL_REF if it addresses something in the per-function
128 1 in a CALL_INSN if it is a const call.
129 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
130 reorg until end of compilation; cleared before used. */
131 unsigned int unchanging : 1;
132 /* 1 in a MEM expression if contents of memory are volatile.
133 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
135 1 in a REG expression if corresponds to a variable declared by the user.
136 0 for an internally generated temporary.
137 In a SYMBOL_REF, this flag is used for machine-specific purposes.
138 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
139 unsigned int volatil : 1;
140 /* 1 in a MEM referring to a field of an aggregate.
141 0 if the MEM was a variable or the result of a * operator in C;
142 1 if it was the result of a . or -> operator (on a struct) in C.
143 1 in a REG if the register is used only in exit code a loop.
144 1 in a SUBREG expression if was generated from a variable with a
146 1 in a CODE_LABEL if the label is used for nonlocal gotos
147 and must not be deleted even if its count is zero.
148 1 in a LABEL_REF if this is a reference to a label outside the
150 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
151 together with the preceding insn. Valid only within sched.
152 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
153 from the target of a branch. Valid from reorg until end of compilation;
154 cleared before used. */
155 unsigned int in_struct : 1;
156 /* 1 if this rtx is used. This is used for copying shared structure.
157 See `unshare_all_rtl'.
158 In a REG, this is not needed for that purpose, and used instead
159 in `leaf_renumber_regs_insn'.
160 In a SYMBOL_REF, means that emit_library_call
161 has used it as the function. */
162 unsigned int used : 1;
163 /* Nonzero if this rtx came from procedure integration.
164 In a REG, nonzero means this reg refers to the return value
165 of the current function. */
166 unsigned integrated : 1;
167 /* 1 in an INSN or a SET if this rtx is related to the call frame,
168 either changing how we compute the frame address or saving and
169 restoring registers in the prologue and epilogue.
170 1 in a MEM if the MEM refers to a scalar, rather than a member of
172 unsigned frame_related : 1;
173 /* The first element of the operands of this rtx.
174 The number of operands and their types are controlled
175 by the `code' field, according to rtl.def. */
179 #define NULL_RTX (rtx) 0
181 /* Define macros to access the `code' field of the rtx. */
183 #ifdef SHORT_ENUM_BUG
184 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
185 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
187 #define GET_CODE(RTX) ((RTX)->code)
188 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
191 #define GET_MODE(RTX) ((RTX)->mode)
192 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
194 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
195 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
196 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
198 /* RTL vector. These appear inside RTX's when there is a need
199 for a variable number of things. The principle use is inside
200 PARALLEL expressions. */
202 typedef struct rtvec_def{
203 int num_elem; /* number of elements */
207 #define NULL_RTVEC (rtvec) 0
209 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
210 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
212 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
214 /* 1 if X is a REG. */
216 #define REG_P(X) (GET_CODE (X) == REG)
218 /* 1 if X is a constant value that is an integer. */
220 #define CONSTANT_P(X) \
221 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
222 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
223 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
224 || GET_CODE (X) == CONSTANT_P_RTX)
226 /* General accessor macros for accessing the fields of an rtx. */
228 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
229 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
230 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
231 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
232 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
233 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
234 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
235 #define XBITMAP(RTX, N) ((RTX)->fld[N].rtbit)
236 #define XTREE(RTX, N) ((RTX)->fld[N].rttree)
239 /* ACCESS MACROS for particular fields of insns. */
241 /* Holds a unique number for each insn.
242 These are not necessarily sequentially increasing. */
243 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
245 /* Chain insns together in sequence. */
246 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
247 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
249 /* The body of an insn. */
250 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
252 /* Code number of instruction, from when it was recognized.
253 -1 means this instruction has not been recognized yet. */
254 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
256 /* Set up in flow.c; empty before then.
257 Holds a chain of INSN_LIST rtx's whose first operands point at
258 previous insns with direct data-flow connections to this one.
259 That means that those insns set variables whose next use is in this insn.
260 They are always in the same basic block as this insn. */
261 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
263 /* 1 if insn has been deleted. */
264 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
266 /* 1 if insn is a call to a const function. */
267 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
269 /* 1 if insn is a branch that should not unconditionally execute its
270 delay slots, i.e., it is an annulled branch. */
271 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
273 /* 1 if insn is in a delay slot and is from the target of the branch. If
274 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
275 executed if the branch is taken. For annulled branches with this bit
276 clear, the insn should be executed only if the branch is not taken. */
277 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
279 /* Holds a list of notes on what this insn does to various REGs.
280 It is a chain of EXPR_LIST rtx's, where the second operand
281 is the chain pointer and the first operand is the REG being described.
282 The mode field of the EXPR_LIST contains not a real machine mode
283 but a value that says what this note says about the REG:
284 REG_DEAD means that the value in REG dies in this insn (i.e., it is
285 not needed past this insn). If REG is set in this insn, the REG_DEAD
286 note may, but need not, be omitted.
287 REG_INC means that the REG is autoincremented or autodecremented.
288 REG_EQUIV describes the insn as a whole; it says that the insn
289 sets a register to a constant value or to be equivalent to a memory
290 address. If the register is spilled to the stack then the constant
291 value should be substituted for it. The contents of the REG_EQUIV
292 is the constant value or memory address, which may be different
293 from the source of the SET although it has the same value. A
294 REG_EQUIV note may also appear on an insn which copies a register
295 parameter to a pseudo-register, if there is a memory address which
296 could be used to hold that pseudo-register throughout the function.
297 REG_EQUAL is like REG_EQUIV except that the destination
298 is only momentarily equal to the specified rtx. Therefore, it
299 cannot be used for substitution; but it can be used for cse.
300 REG_RETVAL means that this insn copies the return-value of
301 a library call out of the hard reg for return values. This note
302 is actually an INSN_LIST and it points to the first insn involved
303 in setting up arguments for the call. flow.c uses this to delete
304 the entire library call when its result is dead.
305 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
306 of the library call and points at the one that has the REG_RETVAL.
307 REG_WAS_0 says that the register set in this insn held 0 before the insn.
308 The contents of the note is the insn that stored the 0.
309 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
310 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
311 REG_NONNEG means that the register is always nonnegative during
312 the containing loop. This is used in branches so that decrement and
313 branch instructions terminating on zero can be matched. There must be
314 an insn pattern in the md file named `decrement_and_branch_until_zero'
315 or else this will never be added to any instructions.
316 REG_NO_CONFLICT means there is no conflict *after this insn*
317 between the register in the note and the destination of this insn.
318 REG_UNUSED identifies a register set in this insn and never used.
319 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
320 CC0, respectively. Normally, these are required to be consecutive insns,
321 but we permit putting a cc0-setting insn in the delay slot of a branch
322 as long as only one copy of the insn exists. In that case, these notes
323 point from one to the other to allow code generation to determine what
324 any require information and to properly update CC_STATUS.
325 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
326 say that the CODE_LABEL contained in the REG_LABEL note is used
328 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
329 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
330 (write after write) dependencies. Data dependencies, which are the only
331 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
332 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
333 -fbranch-probabilities is given. It has an integer value. For jumps,
334 it is the probability that this is a taken branch. For calls, it is the
335 probability that this call won't return.
336 REG_EXEC_COUNT is attached to the first insn of each basic block, and
337 the first insn after each CALL_INSN. It indicates how many times this
339 REG_SAVE_AREA is used to optimize rtl generated by dynamic stack
340 allocations for targets where SETJMP_VIA_SAVE_AREA is true.
341 REG_BR_PRED is attached to JUMP_INSNs only, it holds the branch prediction
342 flags computed by get_jump_flags() after dbr scheduling is complete.
343 REG_FRAME_RELATED_EXPR is attached to insns that are RTX_FRAME_RELATED_P,
344 but are too complex for DWARF to interpret what they imply. The attached
345 rtx is used instead of intuition. */
346 /* REG_EH_REGION is used to indicate what exception region an INSN
347 belongs in. This can be used to indicate what region a call may throw
348 to. a REGION of 0 indicates that a call cannot throw at all.
349 REG_EH_RETHROW is used to indicate what that a call is actually a
350 call to rethrow, and specifies which region the rethrow is targetting.
351 This provides a way to generate the non standard flow edges required
355 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
357 #define ADDR_DIFF_VEC_FLAGS(RTX) ((RTX)->fld[4].rt_addr_diff_vec_flags)
359 /* Don't forget to change reg_note_name in rtl.c. */
360 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
361 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
362 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
363 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
364 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15, REG_BR_PROB = 16,
365 REG_EXEC_COUNT = 17, REG_NOALIAS = 18, REG_SAVE_AREA = 19,
366 REG_BR_PRED = 20, REG_EH_CONTEXT = 21,
367 REG_FRAME_RELATED_EXPR = 22, REG_EH_REGION = 23,
368 REG_EH_RETHROW = 24 };
369 /* The base value for branch probability notes. */
370 #define REG_BR_PROB_BASE 10000
372 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
373 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
374 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
376 /* Names for REG_NOTE's in EXPR_LIST insn's. */
378 extern char *reg_note_name[];
379 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
381 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
382 USE and CLOBBER expressions.
383 USE expressions list the registers filled with arguments that
384 are passed to the function.
385 CLOBBER expressions document the registers explicitly clobbered
387 Pseudo registers can not be mentioned in this list. */
388 #define CALL_INSN_FUNCTION_USAGE(INSN) ((INSN)->fld[7].rtx)
390 /* The label-number of a code-label. The assembler label
391 is made from `L' and the label-number printed in decimal.
392 Label numbers are unique in a compilation. */
393 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
395 #define LINE_NUMBER NOTE
397 /* In a NOTE that is a line number, this is a string for the file name that the
398 line is in. We use the same field to record block numbers temporarily in
399 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
400 between ints and pointers if we use a different macro for the block number.)
401 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
402 information as a rtx in the field. */
404 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
405 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
406 #define NOTE_RANGE_INFO(INSN) ((INSN)->fld[3].rtx)
407 #define NOTE_LIVE_INFO(INSN) ((INSN)->fld[3].rtx)
408 #define NOTE_BASIC_BLOCK(INSN) ((INSN)->fld[3].bb)
410 /* If the NOTE_BLOCK_NUMBER field gets a -1, it means create a new
411 block node for a live range block. */
412 #define NOTE_BLOCK_LIVE_RANGE_BLOCK -1
414 /* In a NOTE that is a line number, this is the line number.
415 Other kinds of NOTEs are identified by negative numbers here. */
416 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
418 /* Codes that appear in the NOTE_LINE_NUMBER field
419 for kinds of notes that are not line numbers.
421 Notice that we do not try to use zero here for any of
422 the special note codes because sometimes the source line
423 actually can be zero! This happens (for example) when we
424 are generating code for the per-translation-unit constructor
425 and destructor routines for some C++ translation unit.
427 If you should change any of the following values, or if you
428 should add a new value here, don't forget to change the
429 note_insn_name array in rtl.c. */
431 /* This note is used to get rid of an insn
432 when it isn't safe to patch the insn out of the chain. */
433 #define NOTE_INSN_DELETED -1
434 #define NOTE_INSN_BLOCK_BEG -2
435 #define NOTE_INSN_BLOCK_END -3
436 #define NOTE_INSN_LOOP_BEG -4
437 #define NOTE_INSN_LOOP_END -5
438 /* This kind of note is generated at the end of the function body,
439 just before the return insn or return label.
440 In an optimizing compilation it is deleted by the first jump optimization,
441 after enabling that optimizer to determine whether control can fall
442 off the end of the function body without a return statement. */
443 #define NOTE_INSN_FUNCTION_END -6
444 /* This kind of note is generated just after each call to `setjmp', et al. */
445 #define NOTE_INSN_SETJMP -7
446 /* Generated at the place in a loop that `continue' jumps to. */
447 #define NOTE_INSN_LOOP_CONT -8
448 /* Generated at the start of a duplicated exit test. */
449 #define NOTE_INSN_LOOP_VTOP -9
450 /* This marks the point immediately after the last prologue insn. */
451 #define NOTE_INSN_PROLOGUE_END -10
452 /* This marks the point immediately prior to the first epilogue insn. */
453 #define NOTE_INSN_EPILOGUE_BEG -11
454 /* Generated in place of user-declared labels when they are deleted. */
455 #define NOTE_INSN_DELETED_LABEL -12
456 /* This note indicates the start of the real body of the function,
457 i.e. the point just after all of the parms have been moved into
459 #define NOTE_INSN_FUNCTION_BEG -13
460 /* These note where exception handling regions begin and end. */
461 #define NOTE_INSN_EH_REGION_BEG -14
462 #define NOTE_INSN_EH_REGION_END -15
463 /* Generated whenever a duplicate line number note is output. For example,
464 one is output after the end of an inline function, in order to prevent
465 the line containing the inline call from being counted twice in gcov. */
466 #define NOTE_REPEATED_LINE_NUMBER -16
468 /* Start/end of a live range region, where pseudos allocated on the stack can
469 be allocated to temporary registers. */
470 #define NOTE_INSN_RANGE_START -17
471 #define NOTE_INSN_RANGE_END -18
472 /* Record which registers are currently live. */
473 #define NOTE_INSN_LIVE -19
474 /* Record the struct for the following basic block. */
475 #define NOTE_INSN_BASIC_BLOCK -20
477 #if 0 /* These are not used, and I don't know what they were for. --rms. */
478 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
479 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
480 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
481 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
482 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
485 /* Names for NOTE insn's other than line numbers. */
487 extern char *note_insn_name[];
488 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
490 /* The name of a label, in case it corresponds to an explicit label
491 in the input source code. */
492 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
494 /* In jump.c, each label contains a count of the number
495 of LABEL_REFs that point at it, so unused labels can be deleted. */
496 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
498 /* The original regno this ADDRESSOF was built for. */
499 #define ADDRESSOF_REGNO(RTX) ((RTX)->fld[1].rtint)
501 /* The variable in the register we took the address of. */
502 #define ADDRESSOF_DECL(X) ((tree) XEXP ((X), 2))
503 #define SET_ADDRESSOF_DECL(X, T) (XEXP ((X), 2) = (rtx) (T))
505 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
506 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
507 be decremented and possibly the label can be deleted. */
508 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
510 /* Once basic blocks are found in flow.c,
511 each CODE_LABEL starts a chain that goes through
512 all the LABEL_REFs that jump to that label.
513 The chain eventually winds up at the CODE_LABEL; it is circular. */
514 #define LABEL_REFS(LABEL) ((LABEL)->fld[6].rtx)
516 /* This is the field in the LABEL_REF through which the circular chain
517 of references to a particular label is linked.
518 This chain is set up in flow.c. */
520 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
522 /* Once basic blocks are found in flow.c,
523 Each LABEL_REF points to its containing instruction with this field. */
525 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
527 /* For a REG rtx, REGNO extracts the register number. */
529 #define REGNO(RTX) ((RTX)->fld[0].rtint)
531 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
532 is the current function's return value. */
534 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
536 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
537 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
539 /* For a CONST_INT rtx, INTVAL extracts the integer. */
541 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
543 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
544 SUBREG_WORD extracts the word-number. */
546 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
547 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
549 /* 1 if the REG contained in SUBREG_REG is already known to be
550 sign- or zero-extended from the mode of the SUBREG to the mode of
551 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
554 When used as a LHS, is means that this extension must be done
555 when assigning to SUBREG_REG. */
557 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
558 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
560 /* Access various components of an ASM_OPERANDS rtx. */
562 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
563 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
564 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
565 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
566 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
567 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
568 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
569 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
570 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
571 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
572 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
574 /* For a MEM rtx, 1 if it's a volatile reference.
575 Also in an ASM_OPERANDS rtx. */
576 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
578 /* For a MEM rtx, 1 if it refers to a field of an aggregate. If zero,
579 RTX may or may not refer to a field of an aggregate. */
580 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
582 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
583 not refer to a scalar.*/
584 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
586 /* Copy the MEM_VOLATILE_P, MEM_IN_STRUCT_P, and MEM_SCALAR_P
587 attributes from RHS to LHS. */
588 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
589 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
590 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
591 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS))
593 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
594 RTX. Otherwise, vice versa. Use this macro only when you are
595 *sure* that you know that the MEM is in a structure, or is a
596 scalar. VAL is evaluated only once. */
597 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
598 ((VAL) ? (MEM_IN_STRUCT_P (RTX) = 1, MEM_SCALAR_P (RTX) = 0) \
599 : (MEM_IN_STRUCT_P (RTX) = 0, MEM_SCALAR_P (RTX) = 1))
601 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
602 set, and may alias anything. Otherwise, the MEM can only alias
603 MEMs in the same alias set. This value is set in a
604 language-dependent manner in the front-end, and should not be
605 altered in the back-end. These set numbers are tested for zero,
606 and compared for equality; they have no other significance. In
607 some front-ends, these numbers may correspond in some way to types,
608 or other language-level entities, but they need not, and the
609 back-end makes no such assumptions. */
610 #define MEM_ALIAS_SET(RTX) (XINT (RTX, 1))
612 /* For a LABEL_REF, 1 means that this reference is to a label outside the
613 loop containing the reference. */
614 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
616 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
617 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
618 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
620 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
621 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
623 /* For a REG, 1 means the register is used only in an exit test of a loop. */
624 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
626 /* During sched, for an insn, 1 means that the insn must be scheduled together
627 with the preceding insn. */
628 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
630 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
631 cost of the dependence link. The cost of executing an instruction
632 may vary based on how the results are used. LINK_COST_ZERO is 1 when
633 the cost through the link varies and is unchanged (i.e., the link has
634 zero additional cost). LINK_COST_FREE is 1 when the cost through the
635 link is zero (i.e., the link makes the cost free). In other cases,
636 the adjustment to the cost is recomputed each time it is needed. */
637 #define LINK_COST_ZERO(X) ((X)->jump)
638 #define LINK_COST_FREE(X) ((X)->call)
640 /* For a SET rtx, SET_DEST is the place that is set
641 and SET_SRC is the value it is set to. */
642 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
643 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
645 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
646 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
647 #define TRAP_CODE(RTX) (RTX)->fld[1].rtx
649 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
650 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
652 /* Flag in a SYMBOL_REF for machine-specific purposes. */
653 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
655 /* 1 in a SYMBOL_REF if it represents a symbol which might have to change
656 if its inlined or unrolled. */
657 #define SYMBOL_REF_NEED_ADJUST(RTX) ((RTX)->in_struct)
659 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
660 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
662 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
663 of the function that is not involved in copying parameters to
664 pseudo-registers. FIRST_PARM_INSN is the very first insn of
665 the function, including the parameter copying.
666 We keep this around in case we must splice
667 this function into the assembly code at the end of the file.
668 FIRST_LABELNO is the first label number used by the function (inclusive).
669 LAST_LABELNO is the last label used by the function (exclusive).
670 MAX_REGNUM is the largest pseudo-register used by that function.
671 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
672 POPS_ARGS is the number of bytes of input arguments popped by the function
673 STACK_SLOT_LIST is the list of stack slots.
674 FORCED_LABELS is the list of labels whose address was taken.
675 FUNCTION_FLAGS are where single-bit flags are saved.
676 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
677 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
678 for the function arguments.
679 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
681 INLINE_REGNO_REG_RTX, INLINE_REGNO_POINTER_FLAG, and
682 INLINE_REGNO_POINTER_ALIGN are pointers to the corresponding arrays.
684 We want this to lay down like an INSN. The PREV_INSN field
685 is always NULL. The NEXT_INSN field always points to the
686 first function insn of the function being squirreled away. */
688 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
689 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
690 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
691 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
692 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
693 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
694 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
695 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
696 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
697 #define FORCED_LABELS(RTX) ((RTX)->fld[11].rtx)
698 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[12].rtint)
699 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[13].rtint)
700 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[14].rtvec)
701 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[15].rtx)
702 #define INLINE_REGNO_REG_RTX(RTX) ((RTX)->fld[16].rtvec)
703 #define INLINE_REGNO_POINTER_FLAG(RTX) ((RTX)->fld[17].rtstr)
704 #define INLINE_REGNO_POINTER_ALIGN(RTX) ((RTX)->fld[18].rtstr)
705 #define PARMREG_STACK_LOC(RTX) ((RTX)->fld[19].rtvec)
707 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
708 for the function and which must be `or'ed into the current flag values when
709 insns from that function are being inlined. */
711 /* These ought to be an enum, but non-ANSI compilers don't like that. */
712 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
713 #define FUNCTION_FLAGS_CALLS_SETJMP 02
714 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
715 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
716 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
717 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
718 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
719 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
720 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
721 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
722 #define FUNCTION_FLAGS_HAS_COMPUTED_JUMP 02000
724 /* Define a macro to look for REG_INC notes,
725 but save time on machines where they never exist. */
727 /* Don't continue this line--convex cc version 4.1 would lose. */
728 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
729 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
731 #define FIND_REG_INC_NOTE(insn, reg) 0
734 /* Indicate whether the machine has any sort of auto increment addressing.
735 If not, we can avoid checking for REG_INC notes. */
737 /* Don't continue this line--convex cc version 4.1 would lose. */
738 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
742 #ifndef HAVE_PRE_INCREMENT
743 #define HAVE_PRE_INCREMENT 0
746 #ifndef HAVE_PRE_DECREMENT
747 #define HAVE_PRE_DECREMENT 0
750 #ifndef HAVE_POST_INCREMENT
751 #define HAVE_POST_INCREMENT 0
754 #ifndef HAVE_POST_DECREMENT
755 #define HAVE_POST_DECREMENT 0
759 /* Some architectures do not have complete pre/post increment/decrement
760 instruction sets, or only move some modes efficiently. These macros
761 allow us to tune autoincrement generation. */
763 #ifndef USE_LOAD_POST_INCREMENT
764 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
767 #ifndef USE_LOAD_POST_DECREMENT
768 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
771 #ifndef USE_LOAD_PRE_INCREMENT
772 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
775 #ifndef USE_LOAD_PRE_DECREMENT
776 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
779 #ifndef USE_STORE_POST_INCREMENT
780 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
783 #ifndef USE_STORE_POST_DECREMENT
784 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
787 #ifndef USE_STORE_PRE_INCREMENT
788 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
791 #ifndef USE_STORE_PRE_DECREMENT
792 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
796 /* Accessors for RANGE_INFO. */
797 /* For RANGE_{START,END} notes return the RANGE_START note. */
798 #define RANGE_INFO_NOTE_START(INSN) (XEXP (INSN, 0))
800 /* For RANGE_{START,END} notes return the RANGE_START note. */
801 #define RANGE_INFO_NOTE_END(INSN) (XEXP (INSN, 1))
803 /* For RANGE_{START,END} notes, return the vector containing the registers used
805 #define RANGE_INFO_REGS(INSN) (XVEC (INSN, 2))
806 #define RANGE_INFO_REGS_REG(INSN, N) (XVECEXP (INSN, 2, N))
807 #define RANGE_INFO_NUM_REGS(INSN) (XVECLEN (INSN, 2))
809 /* For RANGE_{START,END} notes, the number of calls within the range. */
810 #define RANGE_INFO_NCALLS(INSN) (XINT (INSN, 3))
812 /* For RANGE_{START,END} notes, the number of insns within the range. */
813 #define RANGE_INFO_NINSNS(INSN) (XINT (INSN, 4))
815 /* For RANGE_{START,END} notes, a unique # to identify this range. */
816 #define RANGE_INFO_UNIQUE(INSN) (XINT (INSN, 5))
818 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
819 #define RANGE_INFO_BB_START(INSN) (XINT (INSN, 6))
821 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
822 #define RANGE_INFO_BB_END(INSN) (XINT (INSN, 7))
824 /* For RANGE_{START,END} notes, the loop depth the range is in. */
825 #define RANGE_INFO_LOOP_DEPTH(INSN) (XINT (INSN, 8))
827 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
829 #define RANGE_INFO_LIVE_START(INSN) (XBITMAP (INSN, 9))
831 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
833 #define RANGE_INFO_LIVE_END(INSN) (XBITMAP (INSN, 10))
835 /* For RANGE_START notes, the marker # of the start of the range. */
836 #define RANGE_INFO_MARKER_START(INSN) (XINT (INSN, 11))
838 /* For RANGE_START notes, the marker # of the end of the range. */
839 #define RANGE_INFO_MARKER_END(INSN) (XINT (INSN, 12))
841 /* Original pseudo register # for a live range note. */
842 #define RANGE_REG_PSEUDO(INSN,N) (XINT (XVECEXP (INSN, 2, N), 0))
844 /* Pseudo register # original register is copied into or -1. */
845 #define RANGE_REG_COPY(INSN,N) (XINT (XVECEXP (INSN, 2, N), 1))
847 /* How many times a register in a live range note was referenced. */
848 #define RANGE_REG_REFS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 2))
850 /* How many times a register in a live range note was set. */
851 #define RANGE_REG_SETS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 3))
853 /* How many times a register in a live range note died. */
854 #define RANGE_REG_DEATHS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 4))
856 /* Whether the original value is needed to be copied into the range register at
857 the start of the range. */
858 #define RANGE_REG_COPY_FLAGS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 5))
860 /* # of insns the register copy is live over. */
861 #define RANGE_REG_LIVE_LENGTH(INSN,N) (XINT (XVECEXP (INSN, 2, N), 6))
863 /* # of calls the register copy is live over. */
864 #define RANGE_REG_N_CALLS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 7))
866 /* DECL_NODE pointer of the declaration if the register is a user defined
868 #define RANGE_REG_SYMBOL_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 8))
870 /* BLOCK_NODE pointer to the block the variable is declared in if the
871 register is a user defined variable. */
872 #define RANGE_REG_BLOCK_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 9))
874 /* EXPR_LIST of the distinct ranges a variable is in. */
875 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
877 /* Block a variable is declared in. */
878 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
880 /* # of distinct ranges a variable is in. */
881 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
883 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
884 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
886 /* For a NOTE_INSN_LIVE note, the original basic block number. */
887 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
889 /* Generally useful functions. */
891 /* The following functions accept a wide integer argument. Rather than
892 having to cast on every function call, we use a macro instead, that is
893 defined here and in tree.h. */
896 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
897 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
899 extern int exact_log2_wide PROTO((unsigned HOST_WIDE_INT));
900 extern int floor_log2_wide PROTO((unsigned HOST_WIDE_INT));
903 extern int ceil_log2 PROTO((unsigned HOST_WIDE_INT));
905 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
907 #define plus_constant_for_output(X,C) \
908 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
911 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
912 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
913 extern void optimize_save_area_alloca PROTO((rtx));
915 extern rtx gen_rtx PVPROTO((enum rtx_code,
916 enum machine_mode, ...));
917 extern rtvec gen_rtvec PVPROTO((int, ...));
920 extern rtx read_rtx PROTO((FILE *));
923 extern char *oballoc PROTO((int));
924 extern char *permalloc PROTO((int));
925 extern rtx rtx_alloc PROTO((RTX_CODE));
926 extern rtvec rtvec_alloc PROTO((int));
927 extern rtx copy_rtx PROTO((rtx));
928 extern rtx copy_rtx_if_shared PROTO((rtx));
929 extern rtx copy_most_rtx PROTO((rtx, rtx));
930 extern rtx shallow_copy_rtx PROTO((rtx));
931 extern rtvec gen_rtvec_v PROTO((int, rtx *));
932 extern rtvec gen_rtvec_vv PROTO((int, rtunion *));
933 extern rtx gen_reg_rtx PROTO((enum machine_mode));
934 extern rtx gen_label_rtx PROTO((void));
935 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int,
936 int, int, rtx, rtx, int, int,
938 rtvec, char *, char *, rtvec));
939 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
940 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
941 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
942 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
943 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
944 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
945 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
946 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
947 extern int subreg_lowpart_p PROTO((rtx));
948 extern rtx make_safe_from PROTO((rtx, rtx));
949 extern rtx convert_memory_address PROTO((enum machine_mode, rtx));
950 extern rtx memory_address PROTO((enum machine_mode, rtx));
951 extern rtx get_insns PROTO((void));
952 extern rtx get_last_insn PROTO((void));
953 extern rtx get_last_insn_anywhere PROTO((void));
954 extern void start_sequence PROTO((void));
955 extern void push_to_sequence PROTO((rtx));
956 extern void end_sequence PROTO((void));
957 extern rtx gen_sequence PROTO((void));
958 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
959 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
960 extern rtx force_reg PROTO((enum machine_mode, rtx));
961 extern rtx get_pool_constant PROTO((rtx));
962 extern enum machine_mode get_pool_mode PROTO((rtx));
963 extern int get_pool_offset PROTO((rtx));
964 extern rtx simplify_subtraction PROTO((rtx));
965 extern rtx assign_stack_local PROTO((enum machine_mode,
966 HOST_WIDE_INT, int));
967 extern rtx assign_stack_temp PROTO((enum machine_mode,
968 HOST_WIDE_INT, int));
969 extern rtx assign_temp PROTO((union tree_node *,
971 extern rtx protect_from_queue PROTO((rtx, int));
972 extern void emit_queue PROTO((void));
973 extern rtx emit_move_insn PROTO((rtx, rtx));
974 extern rtx emit_insn_before PROTO((rtx, rtx));
975 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
976 extern rtx emit_call_insn_before PROTO((rtx, rtx));
977 extern rtx emit_barrier_before PROTO((rtx));
978 extern rtx emit_label_before PROTO((rtx, rtx));
979 extern rtx emit_note_before PROTO((int, rtx));
980 extern rtx emit_insn_after PROTO((rtx, rtx));
981 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
982 extern rtx emit_barrier_after PROTO((rtx));
983 extern rtx emit_label_after PROTO((rtx, rtx));
984 extern rtx emit_note_after PROTO((int, rtx));
985 extern rtx emit_line_note_after PROTO((char *, int, rtx));
986 extern rtx emit_insn PROTO((rtx));
987 extern rtx emit_insns PROTO((rtx));
988 extern rtx emit_insns_before PROTO((rtx, rtx));
989 extern rtx emit_insns_after PROTO((rtx, rtx));
990 extern rtx emit_jump_insn PROTO((rtx));
991 extern rtx emit_call_insn PROTO((rtx));
992 extern rtx emit_label PROTO((rtx));
993 extern rtx emit_barrier PROTO((void));
994 extern rtx emit_line_note PROTO((char *, int));
995 extern rtx emit_note PROTO((char *, int));
996 extern rtx emit_line_note_force PROTO((char *, int));
997 extern rtx make_insn_raw PROTO((rtx));
998 extern rtx previous_insn PROTO((rtx));
999 extern rtx next_insn PROTO((rtx));
1000 extern rtx prev_nonnote_insn PROTO((rtx));
1001 extern rtx next_nonnote_insn PROTO((rtx));
1002 extern rtx prev_real_insn PROTO((rtx));
1003 extern rtx next_real_insn PROTO((rtx));
1004 extern rtx prev_active_insn PROTO((rtx));
1005 extern rtx next_active_insn PROTO((rtx));
1006 extern rtx prev_label PROTO((rtx));
1007 extern rtx next_label PROTO((rtx));
1008 extern rtx next_cc0_user PROTO((rtx));
1009 extern rtx prev_cc0_setter PROTO((rtx));
1010 extern rtx next_nondeleted_insn PROTO((rtx));
1011 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
1012 extern enum rtx_code swap_condition PROTO((enum rtx_code));
1013 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
1014 extern enum rtx_code signed_condition PROTO((enum rtx_code));
1015 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
1016 extern rtx squeeze_notes PROTO((rtx, rtx));
1017 extern rtx delete_insn PROTO((rtx));
1018 extern void delete_jump PROTO((rtx));
1019 extern rtx get_label_before PROTO((rtx));
1020 extern rtx get_label_after PROTO((rtx));
1021 extern rtx follow_jumps PROTO((rtx));
1022 extern rtx adj_offsettable_operand PROTO((rtx, int));
1023 extern rtx try_split PROTO((rtx, rtx, int));
1024 extern rtx split_insns PROTO((rtx, rtx));
1025 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
1026 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
1027 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
1028 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
1029 extern rtx gen_move_insn PROTO((rtx, rtx));
1030 extern rtx gen_jump PROTO((rtx));
1031 extern rtx gen_beq PROTO((rtx));
1032 extern rtx gen_bge PROTO((rtx));
1033 extern rtx gen_ble PROTO((rtx));
1034 extern rtx gen_mem_addressof PROTO((rtx, union tree_node *));
1035 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
1036 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
1037 extern enum machine_mode choose_hard_reg_mode PROTO((int, int));
1038 extern void set_unique_reg_note PROTO((rtx, enum reg_note, rtx));
1040 /* Functions in rtlanal.c */
1042 extern int rtx_unstable_p PROTO((rtx));
1043 extern int rtx_varies_p PROTO((rtx));
1044 extern int rtx_addr_varies_p PROTO((rtx));
1045 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
1046 extern rtx get_related_value PROTO((rtx));
1047 extern int reg_mentioned_p PROTO((rtx, rtx));
1048 extern int reg_referenced_p PROTO((rtx, rtx));
1049 extern int reg_used_between_p PROTO((rtx, rtx, rtx));
1050 extern int reg_referenced_between_p PROTO((rtx, rtx, rtx));
1051 extern int reg_set_between_p PROTO((rtx, rtx, rtx));
1052 extern int regs_set_between_p PROTO((rtx, rtx, rtx));
1053 extern int modified_between_p PROTO((rtx, rtx, rtx));
1054 extern int no_labels_between_p PROTO((rtx, rtx));
1055 extern int no_jumps_between_p PROTO((rtx, rtx));
1056 extern int modified_in_p PROTO((rtx, rtx));
1057 extern int reg_set_p PROTO((rtx, rtx));
1058 extern rtx single_set PROTO((rtx));
1059 extern int multiple_sets PROTO((rtx));
1060 extern rtx find_last_value PROTO((rtx, rtx *, rtx, int));
1061 extern int refers_to_regno_p PROTO((int, int, rtx, rtx *));
1062 extern int reg_overlap_mentioned_p PROTO((rtx, rtx));
1063 extern void note_stores PROTO((rtx, void (*)(rtx, rtx)));
1064 extern rtx reg_set_last PROTO((rtx, rtx));
1065 extern int rtx_equal_p PROTO((rtx, rtx));
1066 extern int dead_or_set_p PROTO((rtx, rtx));
1067 extern int dead_or_set_regno_p PROTO((rtx, int));
1068 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
1069 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
1070 extern int find_reg_fusage PROTO((rtx, enum rtx_code, rtx));
1071 extern int find_regno_fusage PROTO((rtx, enum rtx_code, int));
1072 extern void remove_note PROTO((rtx, rtx));
1073 extern int side_effects_p PROTO((rtx));
1074 extern int volatile_refs_p PROTO((rtx));
1075 extern int volatile_insn_p PROTO((rtx));
1076 extern int may_trap_p PROTO((rtx));
1077 extern int inequality_comparisons_p PROTO ((rtx));
1078 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
1079 extern rtx replace_regs PROTO((rtx, rtx *, int, int));
1080 extern int computed_jump_p PROTO((rtx));
1081 typedef int (*rtx_function) PROTO((rtx *, void *));
1082 extern int for_each_rtx PROTO((rtx *, rtx_function, void *));
1083 extern rtx regno_use_in PROTO((int, rtx));
1084 extern int auto_inc_p PROTO((rtx));
1088 extern rtx find_use_as_address PROTO((rtx, rtx, HOST_WIDE_INT));
1092 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1093 Always at least 3, since the combiner could put that many togetherm
1094 and we want this to remain correct for all the remaining passes. */
1096 extern int max_parallel;
1098 /* Free up register info memory. */
1099 extern void free_reg_info PROTO((void));
1102 extern int asm_noperands PROTO((rtx));
1103 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **,
1105 enum machine_mode *));
1107 extern enum reg_class reg_preferred_class PROTO((int));
1108 extern enum reg_class reg_alternate_class PROTO((int));
1110 extern rtx get_first_nonparm_insn PROTO((void));
1112 extern void split_block_insns PROTO((int, int));
1113 extern void update_flow_info PROTO((rtx, rtx, rtx, rtx));
1115 /* Standard pieces of rtx, to be substituted directly into things. */
1116 #define pc_rtx (&global_rtl.pc_val)
1117 #define cc0_rtx (&global_rtl.cc0_val)
1119 #define MAX_SAVED_CONST_INT 64
1120 extern struct rtx_def const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1122 #define const0_rtx (&const_int_rtx[MAX_SAVED_CONST_INT])
1123 #define const1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+1])
1124 #define const2_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+2])
1125 #define constm1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT-1])
1126 extern rtx const_true_rtx;
1128 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1130 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1131 same as VOIDmode. */
1133 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1135 /* Likewise, for the constants 1 and 2. */
1137 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1138 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1140 extern struct _global_rtl
1142 struct rtx_def pc_val, cc0_val;
1143 struct rtx_def stack_pointer_val, frame_pointer_val;
1144 struct rtx_def hard_frame_pointer_val;
1145 struct rtx_def arg_pointer_val;
1146 struct rtx_def virtual_incoming_args_val;
1147 struct rtx_def virtual_stack_vars_val;
1148 struct rtx_def virtual_stack_dynamic_val;
1149 struct rtx_def virtual_outgoing_args_val;
1150 struct rtx_def virtual_cfa_val;
1153 /* All references to certain hard regs, except those created
1154 by allocating pseudo regs into them (when that's possible),
1155 go through these unique rtx objects. */
1156 #define stack_pointer_rtx (&global_rtl.stack_pointer_val)
1157 #define frame_pointer_rtx (&global_rtl.frame_pointer_val)
1159 extern rtx pic_offset_table_rtx;
1160 extern rtx struct_value_rtx;
1161 extern rtx struct_value_incoming_rtx;
1162 extern rtx static_chain_rtx;
1163 extern rtx static_chain_incoming_rtx;
1164 extern rtx return_address_pointer_rtx;
1166 /* Include the RTL generation functions. */
1172 /* There are some RTL codes that require special attention; the
1173 generation functions included above do the raw handling. If you
1174 add to this list, modify special_rtx in gengenrtl.c as well. You
1175 should also modify gen_rtx to use the special function. */
1177 extern rtx gen_rtx_CONST_DOUBLE PROTO((enum machine_mode, rtx,
1178 HOST_WIDE_INT, HOST_WIDE_INT));
1179 extern rtx gen_rtx_CONST_INT PROTO((enum machine_mode, HOST_WIDE_INT));
1180 extern rtx gen_rtx_REG PROTO((enum machine_mode, int));
1181 extern rtx gen_rtx_MEM PROTO((enum machine_mode, rtx));
1183 /* We need the cast here to ensure that we get the same result both with
1184 and without prototypes. */
1185 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1188 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1189 is used to represent the frame pointer. This is because the
1190 hard frame pointer and the automatic variables are separated by an amount
1191 that cannot be determined until after register allocation. We can assume
1192 that in this case ELIMINABLE_REGS will be defined, one action of which
1193 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1194 #ifndef HARD_FRAME_POINTER_REGNUM
1195 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1198 /* For register elimination to work properly these hard_frame_pointer_rtx,
1199 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1200 the same register. */
1201 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1202 #define hard_frame_pointer_rtx (&global_rtl.frame_pointer_val)
1204 #define hard_frame_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1207 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1208 #define arg_pointer_rtx (&global_rtl.frame_pointer_val)
1210 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1211 #define arg_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1213 #define arg_pointer_rtx (&global_rtl.arg_pointer_val)
1217 /* Virtual registers are used during RTL generation to refer to locations into
1218 the stack frame when the actual location isn't known until RTL generation
1219 is complete. The routine instantiate_virtual_regs replaces these with
1220 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1223 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1225 /* This points to the first word of the incoming arguments passed on the stack,
1226 either by the caller or by the callee when pretending it was passed by the
1229 #define virtual_incoming_args_rtx (&global_rtl.virtual_incoming_args_val)
1231 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1233 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1234 variable on the stack. Otherwise, it points to the first variable on
1237 #define virtual_stack_vars_rtx (&global_rtl.virtual_stack_vars_val)
1239 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1241 /* This points to the location of dynamically-allocated memory on the stack
1242 immediately after the stack pointer has been adjusted by the amount
1245 #define virtual_stack_dynamic_rtx (&global_rtl.virtual_stack_dynamic_val)
1247 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1249 /* This points to the location in the stack at which outgoing arguments should
1250 be written when the stack is pre-pushed (arguments pushed using push
1251 insns always use sp). */
1253 #define virtual_outgoing_args_rtx (&global_rtl.virtual_outgoing_args_val)
1255 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1257 /* This points to the Canonical Frame Address of the function. This
1258 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1259 but is calculated relative to the arg pointer for simplicity; the
1260 frame pointer nor stack pointer are necessarily fixed relative to
1261 the CFA until after reload. */
1263 #define virtual_cfa_rtx (&global_rtl.virtual_cfa_val)
1265 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1267 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1269 extern rtx find_next_ref PROTO((rtx, rtx));
1270 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
1272 extern rtx output_constant_def PROTO((union tree_node *));
1273 extern rtx immed_real_const PROTO((union tree_node *));
1274 extern union tree_node *make_tree PROTO((union tree_node *, rtx));
1276 /* Define a default value for STORE_FLAG_VALUE. */
1278 #ifndef STORE_FLAG_VALUE
1279 #define STORE_FLAG_VALUE 1
1282 /* Nonzero after the second flow pass has completed.
1283 Set to 1 or 0 by toplev.c */
1284 extern int flow2_completed;
1286 /* Nonzero after end of reload pass.
1287 Set to 1 or 0 by reload1.c. */
1289 extern int reload_completed;
1291 /* Set to 1 while reload_as_needed is operating.
1292 Required by some machines to handle any generated moves differently. */
1294 extern int reload_in_progress;
1296 /* If this is nonzero, we do not bother generating VOLATILE
1297 around volatile memory references, and we are willing to
1298 output indirect addresses. If cse is to follow, we reject
1299 indirect addresses so a useful potential cse is generated;
1300 if it is used only once, instruction combination will produce
1301 the same indirect address eventually. */
1302 extern int cse_not_expected;
1304 /* Set to nonzero before life analysis to indicate that it is unsafe to
1305 generate any new pseudo registers. */
1306 extern int no_new_pseudos;
1308 /* Indexed by pseudo register number, gives the rtx for that pseudo.
1309 Allocated in parallel with regno_pointer_flag. */
1310 extern rtx *regno_reg_rtx;
1312 /* Vector indexed by regno; contain the alignment in bytes and type
1313 pointed to for a register that contains a pointer, if known. */
1314 extern char *regno_pointer_align;
1315 #define REGNO_POINTER_ALIGN(REGNO) regno_pointer_align[REGNO]
1317 /* Translates rtx code to tree code, for those codes needed by
1318 REAL_ARITHMETIC. The function returns an int because the caller may not
1319 know what `enum tree_code' means. */
1321 extern int rtx_to_tree_code PROTO((enum rtx_code));
1324 extern void obfree PROTO ((char *));
1326 extern void gcc_obstack_init PROTO ((struct obstack *));
1327 extern void pop_obstacks PROTO ((void));
1328 extern void push_obstacks PROTO ((struct obstack *,
1331 extern int read_skip_spaces PROTO ((FILE *));
1335 struct cse_basic_block_data;
1336 extern int rtx_cost PROTO ((rtx, enum rtx_code));
1337 extern void delete_trivially_dead_insns PROTO ((rtx, int));
1339 extern int cse_main PROTO ((rtx, int, int, FILE *));
1341 extern void cse_end_of_basic_block PROTO ((rtx,
1342 struct cse_basic_block_data *,
1346 extern int comparison_dominates_p PROTO ((enum rtx_code, enum rtx_code));
1347 extern int condjump_p PROTO ((rtx));
1348 extern rtx condjump_label PROTO ((rtx));
1349 extern int simplejump_p PROTO ((rtx));
1350 extern int returnjump_p PROTO ((rtx));
1351 extern int sets_cc0_p PROTO ((rtx));
1352 extern int invert_jump PROTO ((rtx, rtx));
1353 extern int rtx_renumbered_equal_p PROTO ((rtx, rtx));
1354 extern int true_regnum PROTO ((rtx));
1355 extern int redirect_jump PROTO ((rtx, rtx));
1356 extern void jump_optimize PROTO ((rtx, int, int, int));
1357 extern void thread_jumps PROTO ((rtx, int, int));
1358 extern int redirect_exp PROTO ((rtx *, rtx, rtx, rtx));
1359 extern int rtx_equal_for_thread_p PROTO ((rtx, rtx, rtx));
1360 extern int invert_exp PROTO ((rtx, rtx));
1361 extern int can_reverse_comparison_p PROTO ((rtx, rtx));
1362 extern void delete_for_peephole PROTO ((rtx, rtx));
1363 extern int condjump_in_parallel_p PROTO ((rtx));
1365 /* Flags for jump_optimize() */
1366 #define JUMP_CROSS_JUMP 1
1367 #define JUMP_NOOP_MOVES 1
1368 #define JUMP_AFTER_REGSCAN 1
1370 /* In emit-rtl.c. */
1371 extern int max_reg_num PROTO ((void));
1372 extern int max_label_num PROTO ((void));
1373 extern int get_first_label_num PROTO ((void));
1374 extern void delete_insns_since PROTO ((rtx));
1375 extern void mark_reg_pointer PROTO ((rtx, int));
1376 extern void mark_user_reg PROTO ((rtx));
1377 extern void reset_used_flags PROTO ((rtx));
1378 extern void reorder_insns PROTO ((rtx, rtx, rtx));
1379 extern int get_max_uid PROTO ((void));
1380 extern int in_sequence_p PROTO ((void));
1381 extern void force_next_line_note PROTO ((void));
1382 extern void init_emit PROTO ((void));
1383 extern void init_emit_once PROTO ((int));
1384 extern void push_topmost_sequence PROTO ((void));
1385 extern void pop_topmost_sequence PROTO ((void));
1386 extern int subreg_realpart_p PROTO ((rtx));
1387 extern void reverse_comparison PROTO ((rtx));
1388 extern void set_new_first_and_last_insn PROTO ((rtx, rtx));
1389 extern void set_new_first_and_last_label_num PROTO ((int, int));
1390 extern void unshare_all_rtl PROTO ((rtx));
1391 extern void set_last_insn PROTO ((rtx));
1392 extern void link_cc0_insns PROTO ((rtx));
1393 extern void add_insn PROTO ((rtx));
1394 extern void add_insn_before PROTO ((rtx, rtx));
1395 extern void add_insn_after PROTO ((rtx, rtx));
1396 extern void remove_insn PROTO ((rtx));
1397 extern void reorder_insns_with_line_notes PROTO ((rtx, rtx, rtx));
1398 extern void emit_insn_after_with_line_notes PROTO ((rtx, rtx, rtx));
1399 extern enum rtx_code classify_insn PROTO ((rtx));
1400 extern void init_virtual_regs PROTO ((void));
1401 extern rtx emit PROTO ((rtx));
1402 /* Query and clear/ restore no_line_numbers. This is used by the
1403 switch / case handling in stmt.c to give proper line numbers in
1404 warnings about unreachable code. */
1405 int force_line_numbers PROTO((void));
1406 void restore_line_number_status PROTO((int old_value));
1408 /* In insn-emit.c */
1409 extern void add_clobbers PROTO ((rtx, int));
1412 extern void combine_instructions PROTO ((rtx, int));
1413 extern int extended_count PROTO ((rtx, enum machine_mode, int));
1414 extern rtx remove_death PROTO ((int, rtx));
1416 extern void dump_combine_stats PROTO ((FILE *));
1417 extern void dump_combine_total_stats PROTO ((FILE *));
1422 extern void schedule_insns PROTO ((FILE *));
1425 extern void fix_sched_param PROTO ((char *, char *));
1428 /* In print-rtl.c */
1429 extern void debug_rtx PROTO ((rtx));
1430 extern void debug_rtx_list PROTO ((rtx, int));
1431 extern rtx debug_rtx_find PROTO ((rtx, int));
1433 extern void print_rtl PROTO ((FILE *, rtx));
1434 extern int print_rtl_single PROTO ((FILE *, rtx));
1435 extern void print_inline_rtx PROTO ((FILE *, rtx, int));
1439 extern void init_loop PROTO ((void));
1440 extern rtx libcall_other_reg PROTO ((rtx, rtx));
1442 extern void loop_optimize PROTO ((rtx, FILE *, int, int));
1444 extern void record_excess_regs PROTO ((rtx, rtx, rtx *));
1447 extern void reposition_prologue_and_epilogue_notes PROTO ((rtx));
1448 extern void thread_prologue_and_epilogue_insns PROTO ((rtx));
1449 extern void use_variable PROTO ((rtx));
1450 extern HOST_WIDE_INT get_frame_size PROTO ((void));
1451 extern void preserve_rtl_expr_result PROTO ((rtx));
1452 extern void mark_temp_addr_taken PROTO ((rtx));
1453 extern void update_temp_slot_address PROTO ((rtx, rtx));
1454 extern void use_variable_after PROTO ((rtx, rtx));
1455 extern void purge_addressof PROTO ((rtx));
1458 extern int operands_match_p PROTO ((rtx, rtx));
1459 extern int safe_from_earlyclobber PROTO ((rtx, rtx));
1462 extern void expand_null_return PROTO((void));
1463 extern void emit_jump PROTO ((rtx));
1464 extern int preserve_subexpressions_p PROTO ((void));
1466 /* List (chain of EXPR_LIST) of labels heading the current handlers for
1468 extern rtx nonlocal_goto_handler_labels;
1471 extern void init_expr_once PROTO ((void));
1472 extern void move_by_pieces PROTO ((rtx, rtx, int, int));
1477 extern void stupid_life_analysis PROTO ((rtx, int, FILE *));
1481 extern void allocate_bb_life_data PROTO ((void));
1482 extern void allocate_reg_life_data PROTO ((void));
1483 extern void recompute_reg_usage PROTO ((rtx, int));
1485 extern void dump_flow_info PROTO ((FILE *));
1487 extern void free_bb_mem PROTO ((void));
1490 extern void init_expmed PROTO ((void));
1491 extern void expand_inc PROTO ((rtx, rtx));
1492 extern void expand_dec PROTO ((rtx, rtx));
1493 extern rtx expand_mult_highpart PROTO ((enum machine_mode, rtx,
1494 unsigned HOST_WIDE_INT, rtx,
1499 extern int gcse_main PROTO ((rtx, FILE *));
1503 extern void mark_elimination PROTO ((int, int));
1505 extern int global_alloc PROTO ((FILE *));
1506 extern void dump_global_regs PROTO ((FILE *));
1509 extern void retry_global_alloc PROTO ((int, HARD_REG_SET));
1513 extern int reg_classes_intersect_p PROTO ((enum reg_class, enum reg_class));
1514 extern int reg_class_subset_p PROTO ((enum reg_class, enum reg_class));
1515 extern void globalize_reg PROTO ((int));
1516 extern void init_regs PROTO ((void));
1517 extern void init_reg_sets PROTO ((void));
1518 extern void regset_release_memory PROTO ((void));
1519 extern void regclass_init PROTO ((void));
1520 extern void regclass PROTO ((rtx, int));
1521 extern void reg_scan PROTO ((rtx, int, int));
1522 extern void reg_scan_update PROTO ((rtx, rtx, int));
1523 extern void fix_register PROTO ((char *, int, int));
1527 extern void regmove_optimize PROTO ((rtx, int, FILE *));
1532 extern void dbr_schedule PROTO ((rtx, FILE *));
1536 extern void init_optabs PROTO ((void));
1538 /* In local-alloc.c */
1540 extern void dump_local_alloc PROTO ((FILE *));
1542 extern void local_alloc PROTO ((void));
1543 extern int function_invariant_p PROTO ((rtx));
1546 extern void reload_cse_regs PROTO ((rtx));
1547 extern void init_reload PROTO ((void));
1548 extern void mark_home_live PROTO ((int));
1550 extern int reload PROTO ((rtx, int, FILE *));
1553 /* In caller-save.c */
1554 extern void init_caller_save PROTO ((void));
1557 extern void init_branch_prob PROTO ((const char *));
1559 extern void branch_prob PROTO ((rtx, FILE *));
1560 extern void end_branch_prob PROTO ((FILE *));
1562 extern void output_func_start_profiler PROTO ((void));
1564 /* In reg-stack.c */
1566 extern void reg_to_stack PROTO ((rtx, FILE *));
1568 extern int stack_regs_mentioned_p PROTO ((rtx));
1570 /* In fold-const.c */
1571 extern int add_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1572 HOST_WIDE_INT, HOST_WIDE_INT,
1573 HOST_WIDE_INT *, HOST_WIDE_INT *));
1574 extern int neg_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1575 HOST_WIDE_INT *, HOST_WIDE_INT *));
1576 extern int mul_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1577 HOST_WIDE_INT, HOST_WIDE_INT,
1578 HOST_WIDE_INT *, HOST_WIDE_INT *));
1579 extern void lshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1580 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1581 HOST_WIDE_INT *, int));
1582 extern void rshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1584 HOST_WIDE_INT *, HOST_WIDE_INT *, int));
1585 extern void lrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1586 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1588 extern void rrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1589 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1593 /* Emit library call. */
1594 extern void emit_library_call PVPROTO ((rtx, int, enum machine_mode,
1596 extern rtx emit_library_call_value PVPROTO((rtx, rtx, int,
1601 extern int set_dominates_use PROTO ((int, int, int, rtx, rtx));
1604 extern void bss_section PROTO ((void));
1605 extern int in_data_section PROTO ((void));
1606 extern int supports_one_only PROTO ((void));
1609 extern void init_rtl PROTO ((void));
1610 extern void rtx_free PROTO ((rtx));
1613 extern int true_dependence PROTO ((rtx, enum machine_mode, rtx,
1615 extern int read_dependence PROTO ((rtx, rtx));
1616 extern int anti_dependence PROTO ((rtx, rtx));
1617 extern int output_dependence PROTO ((rtx, rtx));
1618 extern void init_alias_once PROTO ((void));
1619 extern void init_alias_analysis PROTO ((void));
1620 extern void end_alias_analysis PROTO ((void));
1622 extern void record_base_value PROTO ((int, rtx, int));
1623 extern void record_alias_subset PROTO ((int, int));
1624 extern rtx addr_side_effect_eval PROTO ((rtx, int, int));