1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 91-97, 1998 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;
96 /* RTL expression ("rtx"). */
98 typedef struct rtx_def
100 #ifdef ONLY_INT_FIELDS
101 #ifdef CODE_FIELD_BUG
102 unsigned int code : 16;
107 /* The kind of expression this is. */
108 enum rtx_code code : 16;
110 /* The kind of value the expression has. */
111 #ifdef ONLY_INT_FIELDS
114 enum machine_mode mode : 8;
116 /* 1 in an INSN if it can alter flow of control
117 within this function. Not yet used! */
118 unsigned int jump : 1;
119 /* 1 in an INSN if it can call another function. Not yet used! */
120 unsigned int call : 1;
121 /* 1 in a MEM or REG if value of this expression will never change
122 during the current function, even though it is not
124 1 in a SUBREG if it is from a promoted variable that is unsigned.
125 1 in a SYMBOL_REF if it addresses something in the per-function
127 1 in a CALL_INSN if it is a const call.
128 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
129 reorg until end of compilation; cleared before used. */
130 unsigned int unchanging : 1;
131 /* 1 in a MEM expression if contents of memory are volatile.
132 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
134 1 in a REG expression if corresponds to a variable declared by the user.
135 0 for an internally generated temporary.
136 In a SYMBOL_REF, this flag is used for machine-specific purposes.
137 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
138 unsigned int volatil : 1;
139 /* 1 in a MEM referring to a field of an aggregate.
140 0 if the MEM was a variable or the result of a * operator in C;
141 1 if it was the result of a . or -> operator (on a struct) in C.
142 1 in a REG if the register is used only in exit code a loop.
143 1 in a SUBREG expression if was generated from a variable with a
145 1 in a CODE_LABEL if the label is used for nonlocal gotos
146 and must not be deleted even if its count is zero.
147 1 in a LABEL_REF if this is a reference to a label outside the
149 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
150 together with the preceding insn. Valid only within sched.
151 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
152 from the target of a branch. Valid from reorg until end of compilation;
153 cleared before used. */
154 unsigned int in_struct : 1;
155 /* 1 if this rtx is used. This is used for copying shared structure.
156 See `unshare_all_rtl'.
157 In a REG, this is not needed for that purpose, and used instead
158 in `leaf_renumber_regs_insn'.
159 In a SYMBOL_REF, means that emit_library_call
160 has used it as the function. */
161 unsigned int used : 1;
162 /* Nonzero if this rtx came from procedure integration.
163 In a REG, nonzero means this reg refers to the return value
164 of the current function. */
165 unsigned integrated : 1;
166 /* Nonzero if this rtx is related to the call frame, either changing how
167 we compute the frame address or saving and restoring registers in
168 the prologue and epilogue. */
169 unsigned frame_related : 1;
170 /* The first element of the operands of this rtx.
171 The number of operands and their types are controlled
172 by the `code' field, according to rtl.def. */
176 #define NULL_RTX (rtx) 0
178 /* Define macros to access the `code' field of the rtx. */
180 #ifdef SHORT_ENUM_BUG
181 #define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
182 #define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
184 #define GET_CODE(RTX) ((RTX)->code)
185 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
188 #define GET_MODE(RTX) ((RTX)->mode)
189 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
191 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
192 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
193 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
195 /* RTL vector. These appear inside RTX's when there is a need
196 for a variable number of things. The principle use is inside
197 PARALLEL expressions. */
199 typedef struct rtvec_def{
200 int num_elem; /* number of elements */
204 #define NULL_RTVEC (rtvec) 0
206 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
207 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
209 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
211 /* 1 if X is a REG. */
213 #define REG_P(X) (GET_CODE (X) == REG)
215 /* 1 if X is a constant value that is an integer. */
217 #define CONSTANT_P(X) \
218 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
219 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
220 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
221 || GET_CODE (X) == CONSTANT_P_RTX)
223 /* General accessor macros for accessing the fields of an rtx. */
225 #define XEXP(RTX, N) ((RTX)->fld[N].rtx)
226 #define XINT(RTX, N) ((RTX)->fld[N].rtint)
227 #define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
228 #define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
229 #define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
230 #define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
231 #define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
232 #define XBITMAP(RTX, N) ((RTX)->fld[N].rtbit)
233 #define XTREE(RTX, N) ((RTX)->fld[N].rttree)
236 /* ACCESS MACROS for particular fields of insns. */
238 /* Holds a unique number for each insn.
239 These are not necessarily sequentially increasing. */
240 #define INSN_UID(INSN) ((INSN)->fld[0].rtint)
242 /* Chain insns together in sequence. */
243 #define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
244 #define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
246 /* The body of an insn. */
247 #define PATTERN(INSN) ((INSN)->fld[3].rtx)
249 /* Code number of instruction, from when it was recognized.
250 -1 means this instruction has not been recognized yet. */
251 #define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
253 /* Set up in flow.c; empty before then.
254 Holds a chain of INSN_LIST rtx's whose first operands point at
255 previous insns with direct data-flow connections to this one.
256 That means that those insns set variables whose next use is in this insn.
257 They are always in the same basic block as this insn. */
258 #define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
260 /* 1 if insn has been deleted. */
261 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
263 /* 1 if insn is a call to a const function. */
264 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
266 /* 1 if insn is a branch that should not unconditionally execute its
267 delay slots, i.e., it is an annulled branch. */
268 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
270 /* 1 if insn is in a delay slot and is from the target of the branch. If
271 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
272 executed if the branch is taken. For annulled branches with this bit
273 clear, the insn should be executed only if the branch is not taken. */
274 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
276 /* Holds a list of notes on what this insn does to various REGs.
277 It is a chain of EXPR_LIST rtx's, where the second operand
278 is the chain pointer and the first operand is the REG being described.
279 The mode field of the EXPR_LIST contains not a real machine mode
280 but a value that says what this note says about the REG:
281 REG_DEAD means that the value in REG dies in this insn (i.e., it is
282 not needed past this insn). If REG is set in this insn, the REG_DEAD
283 note may, but need not, be omitted.
284 REG_INC means that the REG is autoincremented or autodecremented.
285 REG_EQUIV describes the insn as a whole; it says that the insn
286 sets a register to a constant value or to be equivalent to a memory
287 address. If the register is spilled to the stack then the constant
288 value should be substituted for it. The contents of the REG_EQUIV
289 is the constant value or memory address, which may be different
290 from the source of the SET although it has the same value. A
291 REG_EQUIV note may also appear on an insn which copies a register
292 parameter to a pseudo-register, if there is a memory address which
293 could be used to hold that pseudo-register throughout the function.
294 REG_EQUAL is like REG_EQUIV except that the destination
295 is only momentarily equal to the specified rtx. Therefore, it
296 cannot be used for substitution; but it can be used for cse.
297 REG_RETVAL means that this insn copies the return-value of
298 a library call out of the hard reg for return values. This note
299 is actually an INSN_LIST and it points to the first insn involved
300 in setting up arguments for the call. flow.c uses this to delete
301 the entire library call when its result is dead.
302 REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
303 of the library call and points at the one that has the REG_RETVAL.
304 REG_WAS_0 says that the register set in this insn held 0 before the insn.
305 The contents of the note is the insn that stored the 0.
306 If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
307 The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
308 REG_NONNEG means that the register is always nonnegative during
309 the containing loop. This is used in branches so that decrement and
310 branch instructions terminating on zero can be matched. There must be
311 an insn pattern in the md file named `decrement_and_branch_until_zero'
312 or else this will never be added to any instructions.
313 REG_NO_CONFLICT means there is no conflict *after this insn*
314 between the register in the note and the destination of this insn.
315 REG_UNUSED identifies a register set in this insn and never used.
316 REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
317 CC0, respectively. Normally, these are required to be consecutive insns,
318 but we permit putting a cc0-setting insn in the delay slot of a branch
319 as long as only one copy of the insn exists. In that case, these notes
320 point from one to the other to allow code generation to determine what
321 any require information and to properly update CC_STATUS.
322 REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
323 say that the CODE_LABEL contained in the REG_LABEL note is used
325 REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
326 dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
327 (write after write) dependencies. Data dependencies, which are the only
328 type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
329 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
330 -fbranch-probabilities is given. It has an integer value. For jumps,
331 it is the probability that this is a taken branch. For calls, it is the
332 probability that this call won't return.
333 REG_EXEC_COUNT is attached to the first insn of each basic block, and
334 the first insn after each CALL_INSN. It indicates how many times this
336 REG_SAVE_AREA is used to optimize rtl generated by dynamic stack
337 allocations for targets where SETJMP_VIA_SAVE_AREA is true.
338 REG_BR_PRED is attached to JUMP_INSNs only, it holds the branch prediction
339 flags computed by get_jump_flags() after dbr scheduling is complete.
340 REG_FRAME_RELATED_EXPR is attached to insns that are RTX_FRAME_RELATED_P,
341 but are too complex for DWARF to interpret what they imply. The attached
342 rtx is used instead of intuition. */
344 #define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
346 #define ADDR_DIFF_VEC_FLAGS(RTX) ((RTX)->fld[4].rt_addr_diff_vec_flags)
348 /* Don't forget to change reg_note_name in rtl.c. */
349 enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
350 REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
351 REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
352 REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
353 REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15, REG_BR_PROB = 16,
354 REG_EXEC_COUNT = 17, REG_NOALIAS = 18, REG_SAVE_AREA = 19,
355 REG_BR_PRED = 20, REG_EH_CONTEXT = 21,
356 REG_FRAME_RELATED_EXPR = 22 };
357 /* The base value for branch probability notes. */
358 #define REG_BR_PROB_BASE 10000
360 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
361 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
362 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
364 /* Names for REG_NOTE's in EXPR_LIST insn's. */
366 extern char *reg_note_name[];
367 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
369 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
370 USE and CLOBBER expressions.
371 USE expressions list the registers filled with arguments that
372 are passed to the function.
373 CLOBBER expressions document the registers explicitly clobbered
375 Pseudo registers can not be mentioned in this list. */
376 #define CALL_INSN_FUNCTION_USAGE(INSN) ((INSN)->fld[7].rtx)
378 /* The label-number of a code-label. The assembler label
379 is made from `L' and the label-number printed in decimal.
380 Label numbers are unique in a compilation. */
381 #define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
383 #define LINE_NUMBER NOTE
385 /* In a NOTE that is a line number, this is a string for the file name that the
386 line is in. We use the same field to record block numbers temporarily in
387 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
388 between ints and pointers if we use a different macro for the block number.)
389 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
390 information as a rtx in the field. */
392 #define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
393 #define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
394 #define NOTE_RANGE_INFO(INSN) ((INSN)->fld[3].rtx)
395 #define NOTE_LIVE_INFO(INSN) ((INSN)->fld[3].rtx)
397 /* If the NOTE_BLOCK_NUMBER field gets a -1, it means create a new
398 block node for a live range block. */
399 #define NOTE_BLOCK_LIVE_RANGE_BLOCK -1
401 /* In a NOTE that is a line number, this is the line number.
402 Other kinds of NOTEs are identified by negative numbers here. */
403 #define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
405 /* Codes that appear in the NOTE_LINE_NUMBER field
406 for kinds of notes that are not line numbers.
408 Notice that we do not try to use zero here for any of
409 the special note codes because sometimes the source line
410 actually can be zero! This happens (for example) when we
411 are generating code for the per-translation-unit constructor
412 and destructor routines for some C++ translation unit.
414 If you should change any of the following values, or if you
415 should add a new value here, don't forget to change the
416 note_insn_name array in rtl.c. */
418 /* This note is used to get rid of an insn
419 when it isn't safe to patch the insn out of the chain. */
420 #define NOTE_INSN_DELETED -1
421 #define NOTE_INSN_BLOCK_BEG -2
422 #define NOTE_INSN_BLOCK_END -3
423 #define NOTE_INSN_LOOP_BEG -4
424 #define NOTE_INSN_LOOP_END -5
425 /* This kind of note is generated at the end of the function body,
426 just before the return insn or return label.
427 In an optimizing compilation it is deleted by the first jump optimization,
428 after enabling that optimizer to determine whether control can fall
429 off the end of the function body without a return statement. */
430 #define NOTE_INSN_FUNCTION_END -6
431 /* This kind of note is generated just after each call to `setjmp', et al. */
432 #define NOTE_INSN_SETJMP -7
433 /* Generated at the place in a loop that `continue' jumps to. */
434 #define NOTE_INSN_LOOP_CONT -8
435 /* Generated at the start of a duplicated exit test. */
436 #define NOTE_INSN_LOOP_VTOP -9
437 /* This marks the point immediately after the last prologue insn. */
438 #define NOTE_INSN_PROLOGUE_END -10
439 /* This marks the point immediately prior to the first epilogue insn. */
440 #define NOTE_INSN_EPILOGUE_BEG -11
441 /* Generated in place of user-declared labels when they are deleted. */
442 #define NOTE_INSN_DELETED_LABEL -12
443 /* This note indicates the start of the real body of the function,
444 i.e. the point just after all of the parms have been moved into
446 #define NOTE_INSN_FUNCTION_BEG -13
447 /* These note where exception handling regions begin and end. */
448 #define NOTE_INSN_EH_REGION_BEG -14
449 #define NOTE_INSN_EH_REGION_END -15
450 /* Generated whenever a duplicate line number note is output. For example,
451 one is output after the end of an inline function, in order to prevent
452 the line containing the inline call from being counted twice in gcov. */
453 #define NOTE_REPEATED_LINE_NUMBER -16
455 /* Start/end of a live range region, where pseudos allocated on the stack can
456 be allocated to temporary registers. */
457 #define NOTE_INSN_RANGE_START -17
458 #define NOTE_INSN_RANGE_END -18
459 /* Record which registers are currently live. */
460 #define NOTE_INSN_LIVE -19
462 #if 0 /* These are not used, and I don't know what they were for. --rms. */
463 #define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
464 #define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
465 #define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
466 #define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
467 #define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
470 /* Names for NOTE insn's other than line numbers. */
472 extern char *note_insn_name[];
473 #define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
475 /* The name of a label, in case it corresponds to an explicit label
476 in the input source code. */
477 #define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
479 /* In jump.c, each label contains a count of the number
480 of LABEL_REFs that point at it, so unused labels can be deleted. */
481 #define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
483 /* The original regno this ADDRESSOF was built for. */
484 #define ADDRESSOF_REGNO(RTX) ((RTX)->fld[1].rtint)
486 /* The variable in the register we took the address of. */
487 #define ADDRESSOF_DECL(X) ((tree) XEXP ((X), 2))
488 #define SET_ADDRESSOF_DECL(X, T) (XEXP ((X), 2) = (rtx) (T))
490 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
491 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
492 be decremented and possibly the label can be deleted. */
493 #define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
495 /* Once basic blocks are found in flow.c,
496 each CODE_LABEL starts a chain that goes through
497 all the LABEL_REFs that jump to that label.
498 The chain eventually winds up at the CODE_LABEL; it is circular. */
499 #define LABEL_REFS(LABEL) ((LABEL)->fld[6].rtx)
501 /* This is the field in the LABEL_REF through which the circular chain
502 of references to a particular label is linked.
503 This chain is set up in flow.c. */
505 #define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
507 /* Once basic blocks are found in flow.c,
508 Each LABEL_REF points to its containing instruction with this field. */
510 #define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
512 /* For a REG rtx, REGNO extracts the register number. */
514 #define REGNO(RTX) ((RTX)->fld[0].rtint)
516 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
517 is the current function's return value. */
519 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
521 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
522 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
524 /* For a CONST_INT rtx, INTVAL extracts the integer. */
526 #define INTVAL(RTX) ((RTX)->fld[0].rtwint)
528 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
529 SUBREG_WORD extracts the word-number. */
531 #define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
532 #define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
534 /* 1 if the REG contained in SUBREG_REG is already known to be
535 sign- or zero-extended from the mode of the SUBREG to the mode of
536 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
539 When used as a LHS, is means that this extension must be done
540 when assigning to SUBREG_REG. */
542 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
543 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
545 /* Access various components of an ASM_OPERANDS rtx. */
547 #define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
548 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
549 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
550 #define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
551 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
552 #define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
553 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
554 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
555 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
556 #define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
557 #define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
559 /* For a MEM rtx, 1 if it's a volatile reference.
560 Also in an ASM_OPERANDS rtx. */
561 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
563 /* For a MEM rtx, 1 if it refers to a field of an aggregate. */
564 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
566 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
567 set, and may alias anything. Otherwise, the MEM can only alias
568 MEMs in the same alias set. This value is set in a
569 language-dependent manner in the front-end, and should not be
570 altered in the back-end. These set numbers are tested for zero,
571 and compared for equality; they have no other significance. In
572 some front-ends, these numbers may correspond in some way to types,
573 or other language-level entities, but they need not, and the
574 back-end makes no such assumptions. */
575 #define MEM_ALIAS_SET(RTX) (XINT (RTX, 1))
577 /* For a LABEL_REF, 1 means that this reference is to a label outside the
578 loop containing the reference. */
579 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
581 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
582 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
583 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
585 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
586 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
588 /* For a REG, 1 means the register is used only in an exit test of a loop. */
589 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
591 /* During sched, for an insn, 1 means that the insn must be scheduled together
592 with the preceding insn. */
593 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
595 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
596 cost of the dependence link. The cost of executing an instruction
597 may vary based on how the results are used. LINK_COST_ZERO is 1 when
598 the cost through the link varies and is unchanged (i.e., the link has
599 zero additional cost). LINK_COST_FREE is 1 when the cost through the
600 link is zero (i.e., the link makes the cost free). In other cases,
601 the adjustment to the cost is recomputed each time it is needed. */
602 #define LINK_COST_ZERO(X) ((X)->jump)
603 #define LINK_COST_FREE(X) ((X)->call)
605 /* For a SET rtx, SET_DEST is the place that is set
606 and SET_SRC is the value it is set to. */
607 #define SET_DEST(RTX) ((RTX)->fld[0].rtx)
608 #define SET_SRC(RTX) ((RTX)->fld[1].rtx)
610 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
611 #define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
612 #define TRAP_CODE(RTX) (RTX)->fld[1].rtx
614 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
615 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
617 /* Flag in a SYMBOL_REF for machine-specific purposes. */
618 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
620 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
621 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
623 /* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
624 of the function that is not involved in copying parameters to
625 pseudo-registers. FIRST_PARM_INSN is the very first insn of
626 the function, including the parameter copying.
627 We keep this around in case we must splice
628 this function into the assembly code at the end of the file.
629 FIRST_LABELNO is the first label number used by the function (inclusive).
630 LAST_LABELNO is the last label used by the function (exclusive).
631 MAX_REGNUM is the largest pseudo-register used by that function.
632 FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
633 POPS_ARGS is the number of bytes of input arguments popped by the function
634 STACK_SLOT_LIST is the list of stack slots.
635 FORCED_LABELS is the list of labels whose address was taken.
636 FUNCTION_FLAGS are where single-bit flags are saved.
637 OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
638 ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
639 for the function arguments.
640 ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
642 INLINE_REGNO_REG_RTX, INLINE_REGNO_POINTER_FLAG, and
643 INLINE_REGNO_POINTER_ALIGN are pointers to the corresponding arrays.
645 We want this to lay down like an INSN. The PREV_INSN field
646 is always NULL. The NEXT_INSN field always points to the
647 first function insn of the function being squirreled away. */
649 #define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
650 #define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
651 #define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
652 #define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
653 #define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
654 #define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
655 #define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
656 #define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
657 #define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
658 #define FORCED_LABELS(RTX) ((RTX)->fld[11].rtx)
659 #define FUNCTION_FLAGS(RTX) ((RTX)->fld[12].rtint)
660 #define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[13].rtint)
661 #define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[14].rtvec)
662 #define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[15].rtx)
663 #define INLINE_REGNO_REG_RTX(RTX) ((RTX)->fld[16].rtvec)
664 #define INLINE_REGNO_POINTER_FLAG(RTX) ((RTX)->fld[17].rtstr)
665 #define INLINE_REGNO_POINTER_ALIGN(RTX) ((RTX)->fld[18].rtstr)
666 #define PARMREG_STACK_LOC(RTX) ((RTX)->fld[19].rtvec)
668 /* In FUNCTION_FLAGS we save some variables computed when emitting the code
669 for the function and which must be `or'ed into the current flag values when
670 insns from that function are being inlined. */
672 /* These ought to be an enum, but non-ANSI compilers don't like that. */
673 #define FUNCTION_FLAGS_CALLS_ALLOCA 01
674 #define FUNCTION_FLAGS_CALLS_SETJMP 02
675 #define FUNCTION_FLAGS_RETURNS_STRUCT 04
676 #define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
677 #define FUNCTION_FLAGS_NEEDS_CONTEXT 020
678 #define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
679 #define FUNCTION_FLAGS_RETURNS_POINTER 0100
680 #define FUNCTION_FLAGS_USES_CONST_POOL 0200
681 #define FUNCTION_FLAGS_CALLS_LONGJMP 0400
682 #define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
684 /* Define a macro to look for REG_INC notes,
685 but save time on machines where they never exist. */
687 /* Don't continue this line--convex cc version 4.1 would lose. */
688 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
689 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
691 #define FIND_REG_INC_NOTE(insn, reg) 0
694 /* Indicate whether the machine has any sort of auto increment addressing.
695 If not, we can avoid checking for REG_INC notes. */
697 /* Don't continue this line--convex cc version 4.1 would lose. */
698 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
702 #ifndef HAVE_PRE_INCREMENT
703 #define HAVE_PRE_INCREMENT 0
706 #ifndef HAVE_PRE_DECREMENT
707 #define HAVE_PRE_DECREMENT 0
710 #ifndef HAVE_POST_INCREMENT
711 #define HAVE_POST_INCREMENT 0
714 #ifndef HAVE_POST_DECREMENT
715 #define HAVE_POST_DECREMENT 0
718 /* Accessors for RANGE_INFO. */
719 /* For RANGE_{START,END} notes return the RANGE_START note. */
720 #define RANGE_INFO_NOTE_START(INSN) (XEXP (INSN, 0))
722 /* For RANGE_{START,END} notes return the RANGE_START note. */
723 #define RANGE_INFO_NOTE_END(INSN) (XEXP (INSN, 1))
725 /* For RANGE_{START,END} notes, return the vector containing the registers used
727 #define RANGE_INFO_REGS(INSN) (XVEC (INSN, 2))
728 #define RANGE_INFO_REGS_REG(INSN, N) (XVECEXP (INSN, 2, N))
729 #define RANGE_INFO_NUM_REGS(INSN) (XVECLEN (INSN, 2))
731 /* For RANGE_{START,END} notes, the number of calls within the range. */
732 #define RANGE_INFO_NCALLS(INSN) (XINT (INSN, 3))
734 /* For RANGE_{START,END} notes, the number of insns within the range. */
735 #define RANGE_INFO_NINSNS(INSN) (XINT (INSN, 4))
737 /* For RANGE_{START,END} notes, a unique # to identify this range. */
738 #define RANGE_INFO_UNIQUE(INSN) (XINT (INSN, 5))
740 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
741 #define RANGE_INFO_BB_START(INSN) (XINT (INSN, 6))
743 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
744 #define RANGE_INFO_BB_END(INSN) (XINT (INSN, 7))
746 /* For RANGE_{START,END} notes, the loop depth the range is in. */
747 #define RANGE_INFO_LOOP_DEPTH(INSN) (XINT (INSN, 8))
749 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
751 #define RANGE_INFO_LIVE_START(INSN) (XBITMAP (INSN, 9))
753 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
755 #define RANGE_INFO_LIVE_END(INSN) (XBITMAP (INSN, 10))
757 /* For RANGE_START notes, the marker # of the start of the range. */
758 #define RANGE_INFO_MARKER_START(INSN) (XINT (INSN, 11))
760 /* For RANGE_START notes, the marker # of the end of the range. */
761 #define RANGE_INFO_MARKER_END(INSN) (XINT (INSN, 12))
763 /* Original pseudo register # for a live range note. */
764 #define RANGE_REG_PSEUDO(INSN,N) (XINT (XVECEXP (INSN, 2, N), 0))
766 /* Pseudo register # original register is copied into or -1. */
767 #define RANGE_REG_COPY(INSN,N) (XINT (XVECEXP (INSN, 2, N), 1))
769 /* How many times a register in a live range note was referenced. */
770 #define RANGE_REG_REFS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 2))
772 /* How many times a register in a live range note was set. */
773 #define RANGE_REG_SETS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 3))
775 /* How many times a register in a live range note died. */
776 #define RANGE_REG_DEATHS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 4))
778 /* Whether the original value is needed to be copied into the range register at
779 the start of the range. */
780 #define RANGE_REG_COPY_FLAGS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 5))
782 /* # of insns the register copy is live over. */
783 #define RANGE_REG_LIVE_LENGTH(INSN,N) (XINT (XVECEXP (INSN, 2, N), 6))
785 /* # of calls the register copy is live over. */
786 #define RANGE_REG_N_CALLS(INSN,N) (XINT (XVECEXP (INSN, 2, N), 7))
788 /* DECL_NODE pointer of the declaration if the register is a user defined
790 #define RANGE_REG_SYMBOL_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 8))
792 /* BLOCK_NODE pointer to the block the variable is declared in if the
793 register is a user defined variable. */
794 #define RANGE_REG_BLOCK_NODE(INSN,N) (XTREE (XVECEXP (INSN, 2, N), 9))
796 /* EXPR_LIST of the distinct ranges a variable is in. */
797 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
799 /* Block a variable is declared in. */
800 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
802 /* # of distinct ranges a variable is in. */
803 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
805 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
806 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
808 /* For a NOTE_INSN_LIVE note, the original basic block number. */
809 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
811 /* Generally useful functions. */
813 /* The following functions accept a wide integer argument. Rather than
814 having to cast on every function call, we use a macro instead, that is
815 defined here and in tree.h. */
818 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
819 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
821 extern int exact_log2_wide PROTO((unsigned HOST_WIDE_INT));
822 extern int floor_log2_wide PROTO((unsigned HOST_WIDE_INT));
825 extern int ceil_log2 PROTO((unsigned HOST_WIDE_INT));
827 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
829 #define plus_constant_for_output(X,C) \
830 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
833 extern rtx plus_constant_wide PROTO((rtx, HOST_WIDE_INT));
834 extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
835 extern void optimize_save_area_alloca PROTO((rtx));
837 extern rtx gen_rtx PVPROTO((enum rtx_code,
838 enum machine_mode, ...));
839 extern rtvec gen_rtvec PVPROTO((int, ...));
842 extern rtx read_rtx PROTO((FILE *));
846 /* At present, don't prototype xrealloc, since all of the callers don't
847 cast their pointers to char *, and all of the xrealloc's don't use
849 extern char *xmalloc PROTO((size_t));
850 extern char *xcalloc PROTO((size_t, size_t));
851 extern char *xrealloc PROTO((void *, size_t));
853 extern char *xmalloc ();
854 extern char *xcalloc ();
855 extern char *xrealloc ();
858 extern char *oballoc PROTO((int));
859 extern char *permalloc PROTO((int));
860 extern rtx rtx_alloc PROTO((RTX_CODE));
861 extern rtvec rtvec_alloc PROTO((int));
862 extern rtx copy_rtx PROTO((rtx));
863 extern rtx copy_rtx_if_shared PROTO((rtx));
864 extern rtx copy_most_rtx PROTO((rtx, rtx));
865 extern rtvec gen_rtvec_v PROTO((int, rtx *));
866 extern rtvec gen_rtvec_vv PROTO((int, rtunion *));
867 extern rtx gen_reg_rtx PROTO((enum machine_mode));
868 extern rtx gen_label_rtx PROTO((void));
869 extern rtx gen_inline_header_rtx PROTO((rtx, rtx, int, int, int, int,
870 int, int, rtx, rtx, int, int,
872 rtvec, char *, char *, rtvec));
873 extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
874 extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
875 extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
876 extern rtx gen_highpart PROTO((enum machine_mode, rtx));
877 extern rtx gen_realpart PROTO((enum machine_mode, rtx));
878 extern rtx gen_imagpart PROTO((enum machine_mode, rtx));
879 extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
880 extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
881 extern int subreg_lowpart_p PROTO((rtx));
882 extern rtx make_safe_from PROTO((rtx, rtx));
883 extern rtx convert_memory_address PROTO((enum machine_mode, rtx));
884 extern rtx memory_address PROTO((enum machine_mode, rtx));
885 extern rtx get_insns PROTO((void));
886 extern rtx get_last_insn PROTO((void));
887 extern rtx get_last_insn_anywhere PROTO((void));
888 extern void start_sequence PROTO((void));
889 extern void push_to_sequence PROTO((rtx));
890 extern void end_sequence PROTO((void));
891 extern rtx gen_sequence PROTO((void));
892 extern rtx immed_double_const PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
893 extern rtx force_const_mem PROTO((enum machine_mode, rtx));
894 extern rtx force_reg PROTO((enum machine_mode, rtx));
895 extern rtx get_pool_constant PROTO((rtx));
896 extern enum machine_mode get_pool_mode PROTO((rtx));
897 extern int get_pool_offset PROTO((rtx));
898 extern rtx simplify_subtraction PROTO((rtx));
899 extern rtx assign_stack_local PROTO((enum machine_mode,
900 HOST_WIDE_INT, int));
901 extern rtx assign_stack_temp PROTO((enum machine_mode,
902 HOST_WIDE_INT, int));
903 extern rtx assign_temp PROTO((union tree_node *,
905 extern rtx protect_from_queue PROTO((rtx, int));
906 extern void emit_queue PROTO((void));
907 extern rtx emit_move_insn PROTO((rtx, rtx));
908 extern rtx emit_insn_before PROTO((rtx, rtx));
909 extern rtx emit_jump_insn_before PROTO((rtx, rtx));
910 extern rtx emit_call_insn_before PROTO((rtx, rtx));
911 extern rtx emit_barrier_before PROTO((rtx));
912 extern rtx emit_note_before PROTO((int, rtx));
913 extern rtx emit_insn_after PROTO((rtx, rtx));
914 extern rtx emit_jump_insn_after PROTO((rtx, rtx));
915 extern rtx emit_barrier_after PROTO((rtx));
916 extern rtx emit_label_after PROTO((rtx, rtx));
917 extern rtx emit_note_after PROTO((int, rtx));
918 extern rtx emit_line_note_after PROTO((char *, int, rtx));
919 extern rtx emit_insn PROTO((rtx));
920 extern rtx emit_insns PROTO((rtx));
921 extern rtx emit_insns_before PROTO((rtx, rtx));
922 extern rtx emit_insns_after PROTO((rtx, rtx));
923 extern rtx emit_jump_insn PROTO((rtx));
924 extern rtx emit_call_insn PROTO((rtx));
925 extern rtx emit_label PROTO((rtx));
926 extern rtx emit_barrier PROTO((void));
927 extern rtx emit_line_note PROTO((char *, int));
928 extern rtx emit_note PROTO((char *, int));
929 extern rtx emit_line_note_force PROTO((char *, int));
930 extern rtx make_insn_raw PROTO((rtx));
931 extern rtx previous_insn PROTO((rtx));
932 extern rtx next_insn PROTO((rtx));
933 extern rtx prev_nonnote_insn PROTO((rtx));
934 extern rtx next_nonnote_insn PROTO((rtx));
935 extern rtx prev_real_insn PROTO((rtx));
936 extern rtx next_real_insn PROTO((rtx));
937 extern rtx prev_active_insn PROTO((rtx));
938 extern rtx next_active_insn PROTO((rtx));
939 extern rtx prev_label PROTO((rtx));
940 extern rtx next_label PROTO((rtx));
941 extern rtx next_cc0_user PROTO((rtx));
942 extern rtx prev_cc0_setter PROTO((rtx));
943 extern rtx next_nondeleted_insn PROTO((rtx));
944 extern enum rtx_code reverse_condition PROTO((enum rtx_code));
945 extern enum rtx_code swap_condition PROTO((enum rtx_code));
946 extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
947 extern enum rtx_code signed_condition PROTO((enum rtx_code));
948 extern rtx find_equiv_reg PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
949 extern rtx squeeze_notes PROTO((rtx, rtx));
950 extern rtx delete_insn PROTO((rtx));
951 extern void delete_jump PROTO((rtx));
952 extern rtx get_label_before PROTO((rtx));
953 extern rtx get_label_after PROTO((rtx));
954 extern rtx follow_jumps PROTO((rtx));
955 extern rtx adj_offsettable_operand PROTO((rtx, int));
956 extern rtx try_split PROTO((rtx, rtx, int));
957 extern rtx split_insns PROTO((rtx, rtx));
958 extern rtx simplify_unary_operation PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
959 extern rtx simplify_binary_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
960 extern rtx simplify_ternary_operation PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
961 extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
962 extern rtx nonlocal_label_rtx_list PROTO((void));
963 extern rtx gen_move_insn PROTO((rtx, rtx));
964 extern rtx gen_jump PROTO((rtx));
965 extern rtx gen_beq PROTO((rtx));
966 extern rtx gen_bge PROTO((rtx));
967 extern rtx gen_ble PROTO((rtx));
968 extern rtx gen_mem_addressof PROTO((rtx, union tree_node *));
969 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
970 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
971 extern enum machine_mode choose_hard_reg_mode PROTO((int, int));
973 /* Functions in rtlanal.c */
975 extern int rtx_unstable_p PROTO((rtx));
976 extern int rtx_varies_p PROTO((rtx));
977 extern int rtx_addr_varies_p PROTO((rtx));
978 extern HOST_WIDE_INT get_integer_term PROTO((rtx));
979 extern rtx get_related_value PROTO((rtx));
980 extern int reg_mentioned_p PROTO((rtx, rtx));
981 extern int reg_referenced_p PROTO((rtx, rtx));
982 extern int reg_used_between_p PROTO((rtx, rtx, rtx));
983 extern int reg_referenced_between_p PROTO((rtx, rtx, rtx));
984 extern int reg_set_between_p PROTO((rtx, rtx, rtx));
985 extern int modified_between_p PROTO((rtx, rtx, rtx));
986 extern int no_labels_between_p PROTO((rtx, rtx));
987 extern int modified_in_p PROTO((rtx, rtx));
988 extern int reg_set_p PROTO((rtx, rtx));
989 extern rtx single_set PROTO((rtx));
990 extern rtx find_last_value PROTO((rtx, rtx *, rtx));
991 extern int refers_to_regno_p PROTO((int, int, rtx, rtx *));
992 extern int reg_overlap_mentioned_p PROTO((rtx, rtx));
993 extern void note_stores PROTO((rtx, void (*)()));
994 extern rtx reg_set_last PROTO((rtx, rtx));
995 extern int rtx_equal_p PROTO((rtx, rtx));
996 extern int dead_or_set_p PROTO((rtx, rtx));
997 extern int dead_or_set_regno_p PROTO((rtx, int));
998 extern rtx find_reg_note PROTO((rtx, enum reg_note, rtx));
999 extern rtx find_regno_note PROTO((rtx, enum reg_note, int));
1000 extern int find_reg_fusage PROTO((rtx, enum rtx_code, rtx));
1001 extern int find_regno_fusage PROTO((rtx, enum rtx_code, int));
1002 extern void remove_note PROTO((rtx, rtx));
1003 extern int side_effects_p PROTO((rtx));
1004 extern int volatile_refs_p PROTO((rtx));
1005 extern int volatile_insn_p PROTO((rtx));
1006 extern int may_trap_p PROTO((rtx));
1007 extern int inequality_comparisons_p PROTO ((rtx));
1008 extern rtx replace_rtx PROTO((rtx, rtx, rtx));
1009 extern rtx replace_regs PROTO((rtx, rtx *, int, int));
1010 extern int computed_jump_p PROTO((rtx));
1011 typedef int (*rtx_function) PROTO((rtx *, void *));
1012 extern int for_each_rtx PROTO((rtx *, rtx_function, void *));
1016 extern rtx find_use_as_address PROTO((rtx, rtx, HOST_WIDE_INT));
1020 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1021 Always at least 3, since the combiner could put that many togetherm
1022 and we want this to remain correct for all the remaining passes. */
1024 extern int max_parallel;
1026 /* Free up register info memory. */
1027 extern void free_reg_info PROTO((void));
1030 extern int asm_noperands PROTO((rtx));
1031 extern char *decode_asm_operands PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
1033 extern enum reg_class reg_preferred_class PROTO((int));
1034 extern enum reg_class reg_alternate_class PROTO((int));
1036 extern rtx get_first_nonparm_insn PROTO((void));
1038 /* Standard pieces of rtx, to be substituted directly into things. */
1039 #define pc_rtx (&global_rtl.pc_val)
1040 #define cc0_rtx (&global_rtl.cc0_val)
1042 #define MAX_SAVED_CONST_INT 64
1043 extern struct rtx_def const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1045 #define const0_rtx (&const_int_rtx[MAX_SAVED_CONST_INT])
1046 #define const1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+1])
1047 #define const2_rtx (&const_int_rtx[MAX_SAVED_CONST_INT+2])
1048 #define constm1_rtx (&const_int_rtx[MAX_SAVED_CONST_INT-1])
1049 extern rtx const_true_rtx;
1051 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1053 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1054 same as VOIDmode. */
1056 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1058 /* Likewise, for the constants 1 and 2. */
1060 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1061 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1063 extern struct _global_rtl
1065 struct rtx_def pc_val, cc0_val;
1066 struct rtx_def stack_pointer_val, frame_pointer_val;
1067 struct rtx_def hard_frame_pointer_val;
1068 struct rtx_def arg_pointer_val;
1069 struct rtx_def virtual_incoming_args_val;
1070 struct rtx_def virtual_stack_vars_val;
1071 struct rtx_def virtual_stack_dynamic_val;
1072 struct rtx_def virtual_outgoing_args_val;
1073 struct rtx_def virtual_cfa_val;
1076 /* All references to certain hard regs, except those created
1077 by allocating pseudo regs into them (when that's possible),
1078 go through these unique rtx objects. */
1079 #define stack_pointer_rtx (&global_rtl.stack_pointer_val)
1080 #define frame_pointer_rtx (&global_rtl.frame_pointer_val)
1082 extern rtx pic_offset_table_rtx;
1083 extern rtx struct_value_rtx;
1084 extern rtx struct_value_incoming_rtx;
1085 extern rtx static_chain_rtx;
1086 extern rtx static_chain_incoming_rtx;
1087 extern rtx return_address_pointer_rtx;
1089 /* Include the RTL generation functions. */
1095 /* There are some RTL codes that require special attention; the
1096 generation functions included above do the raw handling. If you
1097 add to this list, modify special_rtx in gengenrtl.c as well. You
1098 should also modify gen_rtx to use the special function. */
1100 extern rtx gen_rtx_CONST_INT PROTO((enum machine_mode, HOST_WIDE_INT));
1101 extern rtx gen_rtx_REG PROTO((enum machine_mode, int));
1102 extern rtx gen_rtx_MEM PROTO((enum machine_mode, rtx));
1104 /* We need the cast here to ensure that we get the same result both with
1105 and without prototypes. */
1106 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1109 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1110 is used to represent the frame pointer. This is because the
1111 hard frame pointer and the automatic variables are separated by an amount
1112 that cannot be determined until after register allocation. We can assume
1113 that in this case ELIMINABLE_REGS will be defined, one action of which
1114 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1115 #ifndef HARD_FRAME_POINTER_REGNUM
1116 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1119 /* For register elimination to work properly these hard_frame_pointer_rtx,
1120 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1121 the same register. */
1122 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1123 #define hard_frame_pointer_rtx (&global_rtl.frame_pointer_val)
1125 #define hard_frame_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1128 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1129 #define arg_pointer_rtx (&global_rtl.frame_pointer_val)
1131 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1132 #define arg_pointer_rtx (&global_rtl.hard_frame_pointer_val)
1134 #define arg_pointer_rtx (&global_rtl.arg_pointer_val)
1138 /* Virtual registers are used during RTL generation to refer to locations into
1139 the stack frame when the actual location isn't known until RTL generation
1140 is complete. The routine instantiate_virtual_regs replaces these with
1141 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1144 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1146 /* This points to the first word of the incoming arguments passed on the stack,
1147 either by the caller or by the callee when pretending it was passed by the
1150 #define virtual_incoming_args_rtx (&global_rtl.virtual_incoming_args_val)
1152 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1154 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1155 variable on the stack. Otherwise, it points to the first variable on
1158 #define virtual_stack_vars_rtx (&global_rtl.virtual_stack_vars_val)
1160 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1162 /* This points to the location of dynamically-allocated memory on the stack
1163 immediately after the stack pointer has been adjusted by the amount
1166 #define virtual_stack_dynamic_rtx (&global_rtl.virtual_stack_dynamic_val)
1168 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1170 /* This points to the location in the stack at which outgoing arguments should
1171 be written when the stack is pre-pushed (arguments pushed using push
1172 insns always use sp). */
1174 #define virtual_outgoing_args_rtx (&global_rtl.virtual_outgoing_args_val)
1176 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1178 /* This points to the Canonical Frame Address of the function. This
1179 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1180 but is calculated relative to the arg pointer for simplicity; the
1181 frame pointer nor stack pointer are necessarily fixed relative to
1182 the CFA until after reload. */
1184 #define virtual_cfa_rtx (&global_rtl.virtual_cfa_val)
1186 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1188 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1190 extern rtx find_next_ref PROTO((rtx, rtx));
1191 extern rtx *find_single_use PROTO((rtx, rtx, rtx *));
1193 extern rtx output_constant_def PROTO((union tree_node *));
1194 extern rtx immed_real_const PROTO((union tree_node *));
1195 extern union tree_node *make_tree PROTO((union tree_node *, rtx));
1197 /* Define a default value for STORE_FLAG_VALUE. */
1199 #ifndef STORE_FLAG_VALUE
1200 #define STORE_FLAG_VALUE 1
1203 /* Nonzero after the second flow pass has completed.
1204 Set to 1 or 0 by toplev.c */
1205 extern int flow2_completed;
1207 /* Nonzero after end of reload pass.
1208 Set to 1 or 0 by reload1.c. */
1210 extern int reload_completed;
1212 /* Set to 1 while reload_as_needed is operating.
1213 Required by some machines to handle any generated moves differently. */
1215 extern int reload_in_progress;
1217 /* If this is nonzero, we do not bother generating VOLATILE
1218 around volatile memory references, and we are willing to
1219 output indirect addresses. If cse is to follow, we reject
1220 indirect addresses so a useful potential cse is generated;
1221 if it is used only once, instruction combination will produce
1222 the same indirect address eventually. */
1223 extern int cse_not_expected;
1225 /* Set to nonzero before life analysis to indicate that it is unsafe to
1226 generate any new pseudo registers. */
1227 extern int no_new_pseudos;
1229 /* Indexed by pseudo register number, gives the rtx for that pseudo.
1230 Allocated in parallel with regno_pointer_flag. */
1231 extern rtx *regno_reg_rtx;
1233 /* Vector indexed by regno; contain the alignment in bytes and type
1234 pointed to for a register that contains a pointer, if known. */
1235 extern char *regno_pointer_align;
1236 #define REGNO_POINTER_ALIGN(REGNO) regno_pointer_align[REGNO]
1238 /* Translates rtx code to tree code, for those codes needed by
1239 REAL_ARITHMETIC. The function returns an int because the caller may not
1240 know what `enum tree_code' means. */
1242 extern int rtx_to_tree_code PROTO((enum rtx_code));
1245 extern void obfree PROTO ((char *));
1247 extern void gcc_obstack_init PROTO ((struct obstack *));
1248 extern void pop_obstacks PROTO ((void));
1249 extern void push_obstacks PROTO ((struct obstack *,
1252 extern int read_skip_spaces PROTO ((FILE *));
1256 struct cse_basic_block_data;
1257 extern int rtx_cost PROTO ((rtx, enum rtx_code));
1258 extern void delete_trivially_dead_insns PROTO ((rtx, int));
1260 extern int cse_main PROTO ((rtx, int, int, FILE *));
1262 extern void cse_end_of_basic_block PROTO ((rtx,
1263 struct cse_basic_block_data *,
1267 extern int comparison_dominates_p PROTO ((enum rtx_code, enum rtx_code));
1268 extern int condjump_p PROTO ((rtx));
1269 extern int simplejump_p PROTO ((rtx));
1270 extern int sets_cc0_p PROTO ((rtx));
1271 extern int invert_jump PROTO ((rtx, rtx));
1272 extern int rtx_renumbered_equal_p PROTO ((rtx, rtx));
1273 extern int true_regnum PROTO ((rtx));
1274 extern int redirect_jump PROTO ((rtx, rtx));
1275 extern void jump_optimize PROTO ((rtx, int, int, int));
1276 extern void thread_jumps PROTO ((rtx, int, int));
1277 extern int redirect_exp PROTO ((rtx *, rtx, rtx, rtx));
1278 extern int rtx_equal_for_thread_p PROTO ((rtx, rtx, rtx));
1279 extern int invert_exp PROTO ((rtx, rtx));
1280 extern int can_reverse_comparison_p PROTO ((rtx, rtx));
1281 extern void delete_for_peephole PROTO ((rtx, rtx));
1282 extern int condjump_in_parallel_p PROTO ((rtx));
1284 /* Flags for jump_optimize() */
1285 #define JUMP_CROSS_JUMP 1
1286 #define JUMP_NOOP_MOVES 1
1287 #define JUMP_AFTER_REGSCAN 1
1289 /* In emit-rtl.c. */
1290 extern int max_reg_num PROTO ((void));
1291 extern int max_label_num PROTO ((void));
1292 extern int get_first_label_num PROTO ((void));
1293 extern void delete_insns_since PROTO ((rtx));
1294 extern void mark_reg_pointer PROTO ((rtx, int));
1295 extern void mark_user_reg PROTO ((rtx));
1296 extern void reset_used_flags PROTO ((rtx));
1297 extern void reorder_insns PROTO ((rtx, rtx, rtx));
1298 extern int get_max_uid PROTO ((void));
1299 extern int in_sequence_p PROTO ((void));
1300 extern void force_next_line_note PROTO ((void));
1301 extern void init_emit PROTO ((void));
1302 extern void init_emit_once PROTO ((int));
1303 extern void push_topmost_sequence PROTO ((void));
1304 extern void pop_topmost_sequence PROTO ((void));
1305 extern int subreg_realpart_p PROTO ((rtx));
1306 extern void reverse_comparison PROTO ((rtx));
1307 extern void set_new_first_and_last_insn PROTO ((rtx, rtx));
1308 extern void set_new_first_and_last_label_num PROTO ((int, int));
1309 extern void unshare_all_rtl PROTO ((rtx));
1310 extern void set_last_insn PROTO ((rtx));
1311 extern void link_cc0_insns PROTO ((rtx));
1312 extern void add_insn PROTO ((rtx));
1313 extern void add_insn_before PROTO ((rtx, rtx));
1314 extern void add_insn_after PROTO ((rtx, rtx));
1315 extern void reorder_insns_with_line_notes PROTO ((rtx, rtx, rtx));
1316 extern void emit_insn_after_with_line_notes PROTO ((rtx, rtx, rtx));
1317 extern enum rtx_code classify_insn PROTO ((rtx));
1318 extern void init_virtual_regs PROTO ((void));
1319 extern rtx emit PROTO ((rtx));
1320 /* Query and clear/ restore no_line_numbers. This is used by the
1321 switch / case handling in stmt.c to give proper line numbers in
1322 warnings about unreachable code. */
1323 int force_line_numbers PROTO((void));
1324 void restore_line_number_status PROTO((int old_value));
1326 /* In insn-emit.c */
1327 extern void add_clobbers PROTO ((rtx, int));
1330 extern void combine_instructions PROTO ((rtx, int));
1331 extern int extended_count PROTO ((rtx, enum machine_mode, int));
1332 extern rtx remove_death PROTO ((int, rtx));
1334 extern void dump_combine_stats PROTO ((FILE *));
1335 extern void dump_combine_total_stats PROTO ((FILE *));
1340 extern void schedule_insns PROTO ((FILE *));
1343 extern void fix_sched_param PROTO ((char *, char *));
1346 /* In print-rtl.c */
1347 extern void debug_rtx PROTO ((rtx));
1348 extern void debug_rtx_list PROTO ((rtx, int));
1349 extern rtx debug_rtx_find PROTO ((rtx, int));
1351 extern void print_rtl PROTO ((FILE *, rtx));
1352 extern int print_rtl_single PROTO ((FILE *, rtx));
1353 extern void print_inline_rtx PROTO ((FILE *, rtx, int));
1357 extern void init_loop PROTO ((void));
1359 extern void loop_optimize PROTO ((rtx, FILE *, int, int));
1361 extern void record_excess_regs PROTO ((rtx, rtx, rtx *));
1364 extern void reposition_prologue_and_epilogue_notes PROTO ((rtx));
1365 extern void thread_prologue_and_epilogue_insns PROTO ((rtx));
1366 extern void use_variable PROTO ((rtx));
1367 extern HOST_WIDE_INT get_frame_size PROTO ((void));
1368 extern void preserve_rtl_expr_result PROTO ((rtx));
1369 extern void mark_temp_addr_taken PROTO ((rtx));
1370 extern void update_temp_slot_address PROTO ((rtx, rtx));
1371 extern void use_variable_after PROTO ((rtx, rtx));
1372 extern void purge_addressof PROTO ((rtx));
1375 extern int operands_match_p PROTO ((rtx, rtx));
1376 extern int safe_from_earlyclobber PROTO ((rtx, rtx));
1379 extern void expand_null_return PROTO((void));
1380 extern void emit_jump PROTO ((rtx));
1381 extern int preserve_subexpressions_p PROTO ((void));
1384 extern void init_expr_once PROTO ((void));
1385 extern void move_by_pieces PROTO ((rtx, rtx, int, int));
1390 extern void stupid_life_analysis PROTO ((rtx, int, FILE *));
1394 extern void allocate_for_life_analysis PROTO ((void));
1395 extern void recompute_reg_usage PROTO ((rtx));
1397 extern void dump_flow_info PROTO ((FILE *));
1399 extern void free_bb_memory PROTO ((void));
1402 extern void init_expmed PROTO ((void));
1403 extern void expand_inc PROTO ((rtx, rtx));
1404 extern void expand_dec PROTO ((rtx, rtx));
1405 extern rtx expand_mult_highpart PROTO ((enum machine_mode, rtx,
1406 unsigned HOST_WIDE_INT, rtx,
1411 extern void gcse_main PROTO ((rtx, FILE *));
1415 extern void mark_elimination PROTO ((int, int));
1417 extern int global_alloc PROTO ((FILE *));
1418 extern void dump_global_regs PROTO ((FILE *));
1421 extern void retry_global_alloc PROTO ((int, HARD_REG_SET));
1425 extern int reg_classes_intersect_p PROTO ((enum reg_class, enum reg_class));
1426 extern int reg_class_subset_p PROTO ((enum reg_class, enum reg_class));
1427 extern void globalize_reg PROTO ((int));
1428 extern void init_regs PROTO ((void));
1429 extern void init_reg_sets PROTO ((void));
1430 extern void regset_release_memory PROTO ((void));
1431 extern void regclass_init PROTO ((void));
1432 extern void regclass PROTO ((rtx, int));
1433 extern void reg_scan PROTO ((rtx, int, int));
1434 extern void reg_scan_update PROTO ((rtx, rtx, int));
1435 extern void fix_register PROTO ((char *, int, int));
1439 extern void regmove_optimize PROTO ((rtx, int, FILE *));
1444 extern void dbr_schedule PROTO ((rtx, FILE *));
1448 extern void init_optabs PROTO ((void));
1450 /* In local-alloc.c */
1452 extern void dump_local_alloc PROTO ((FILE *));
1454 extern void local_alloc PROTO ((void));
1457 extern void reload_cse_regs PROTO ((rtx));
1458 extern void init_reload PROTO ((void));
1459 extern void mark_home_live PROTO ((int));
1461 extern int reload PROTO ((rtx, int, FILE *));
1464 /* In caller-save.c */
1465 extern void init_caller_save PROTO ((void));
1468 extern void init_branch_prob PROTO ((char *));
1470 extern void branch_prob PROTO ((rtx, FILE *));
1471 extern void end_branch_prob PROTO ((FILE *));
1473 extern void output_func_start_profiler PROTO ((void));
1475 /* In reg-stack.c */
1477 extern void reg_to_stack PROTO ((rtx, FILE *));
1479 extern int stack_regs_mentioned_p PROTO ((rtx));
1481 /* In fold-const.c */
1482 extern int add_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1483 HOST_WIDE_INT, HOST_WIDE_INT,
1484 HOST_WIDE_INT *, HOST_WIDE_INT *));
1485 extern int neg_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1486 HOST_WIDE_INT *, HOST_WIDE_INT *));
1487 extern int mul_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1488 HOST_WIDE_INT, HOST_WIDE_INT,
1489 HOST_WIDE_INT *, HOST_WIDE_INT *));
1490 extern void lshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1491 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1492 HOST_WIDE_INT *, int));
1493 extern void rshift_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1495 HOST_WIDE_INT *, HOST_WIDE_INT *, int));
1496 extern void lrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1497 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1499 extern void rrotate_double PROTO ((HOST_WIDE_INT, HOST_WIDE_INT,
1500 HOST_WIDE_INT, int, HOST_WIDE_INT *,
1504 /* Emit library call. */
1505 extern void emit_library_call PVPROTO ((rtx, int, enum machine_mode,
1507 extern rtx emit_library_call_value PVPROTO((rtx, rtx, int,
1512 extern int set_dominates_use PROTO ((int, int, int, rtx, rtx));
1515 extern void bss_section PROTO ((void));
1516 extern int in_data_section PROTO ((void));
1517 extern int supports_one_only PROTO ((void));
1520 extern void init_rtl PROTO ((void));
1521 extern void rtx_free PROTO ((rtx));
1524 extern int true_dependence PROTO ((rtx, enum machine_mode, rtx,
1526 extern int read_dependence PROTO ((rtx, rtx));
1527 extern int anti_dependence PROTO ((rtx, rtx));
1528 extern int output_dependence PROTO ((rtx, rtx));
1529 extern void init_alias_once PROTO ((void));
1530 extern void init_alias_analysis PROTO ((void));
1531 extern void end_alias_analysis PROTO ((void));
1533 extern void record_base_value PROTO ((int, rtx, int));
1534 extern void record_alias_subset PROTO ((int, int));