1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
29 #undef FFS /* Some systems predefine this symbol; don't let it interfere. */
30 #undef FLOAT /* Likewise. */
31 #undef ABS /* Likewise. */
32 #undef PC /* Likewise. */
38 /* Register Transfer Language EXPRESSIONS CODES */
40 #define RTX_CODE enum rtx_code
43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
44 #include "rtl.def" /* rtl expressions are documented here */
47 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
49 Assumes default enum value assignment. */
51 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
54 extern const int rtx_length[];
55 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
57 extern const char * const rtx_name[];
58 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
60 extern const char * const rtx_format[];
61 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
63 extern const char rtx_class[];
64 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
66 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
67 relative to which the offsets are calculated, as explained in rtl.def. */
70 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
71 unsigned min_align: 8;
73 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
74 unsigned min_after_vec: 1; /* minimum address target label is after the ADDR_DIFF_VEC. */
75 unsigned max_after_vec: 1; /* maximum address target label is after the ADDR_DIFF_VEC. */
76 unsigned min_after_base: 1; /* minimum address target label is after BASE. */
77 unsigned max_after_base: 1; /* maximum address target label is after BASE. */
78 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
79 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
82 } addr_diff_vec_flags;
84 /* Common union for an element of an rtx. */
86 typedef union rtunion_def
93 struct rtvec_def *rtvec;
94 enum machine_mode rttype;
95 addr_diff_vec_flags rt_addr_diff_vec_flags;
96 struct cselib_val_struct *rt_cselib;
97 struct bitmap_head_def *rtbit;
98 union tree_node *rttree;
99 struct basic_block_def *bb;
102 /* RTL expression ("rtx"). */
104 typedef struct rtx_def
106 /* The kind of expression this is. */
107 ENUM_BITFIELD(rtx_code) code: 16;
109 /* The kind of value the expression has. */
110 ENUM_BITFIELD(machine_mode) mode : 8;
112 /* 1 in an INSN if it can alter flow of control
113 within this function.
114 LINK_COST_ZERO in an INSN_LIST. */
115 unsigned int jump : 1;
116 /* 1 in an INSN if it can call another function.
117 LINK_COST_FREE in an INSN_LIST. */
118 unsigned int call : 1;
119 /* 1 in a MEM or REG if value of this expression will never change
120 during the current function, even though it is not
122 1 in a SUBREG if it is from a promoted variable that is unsigned.
123 1 in a SYMBOL_REF if it addresses something in the per-function
125 1 in a CALL_INSN if it is a const call.
126 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
127 reorg until end of compilation; cleared before used. */
128 unsigned int unchanging : 1;
129 /* 1 in a MEM expression if contents of memory are volatile.
130 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
132 1 in a REG expression if corresponds to a variable declared by the user.
133 0 for an internally generated temporary.
134 In a SYMBOL_REF, this flag is used for machine-specific purposes.
135 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
136 unsigned int volatil : 1;
137 /* 1 in a MEM referring to a field of an aggregate.
138 0 if the MEM was a variable or the result of a * operator in C;
139 1 if it was the result of a . or -> operator (on a struct) in C.
140 1 in a REG if the register is used only in exit code a loop.
141 1 in a SUBREG expression if was generated from a variable with a
143 1 in a CODE_LABEL if the label is used for nonlocal gotos
144 and must not be deleted even if its count is zero.
145 1 in a LABEL_REF if this is a reference to a label outside the
147 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
148 together with the preceding insn. Valid only within sched.
149 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
150 from the target of a branch. Valid from reorg until end of compilation;
151 cleared before used. */
152 unsigned int in_struct : 1;
153 /* 1 if this rtx is used. This is used for copying shared structure.
154 See `unshare_all_rtl'.
155 In a REG, this is not needed for that purpose, and used instead
156 in `leaf_renumber_regs_insn'.
157 In a SYMBOL_REF, means that emit_library_call
158 has used it as the function. */
159 unsigned int used : 1;
160 /* Nonzero if this rtx came from procedure integration.
161 In a REG, nonzero means this reg refers to the return value
162 of the current function. */
163 unsigned integrated : 1;
164 /* 1 in an INSN or a SET if this rtx is related to the call frame,
165 either changing how we compute the frame address or saving and
166 restoring registers in the prologue and epilogue.
167 1 in a MEM if the MEM refers to a scalar, rather than a member of
169 unsigned frame_related : 1;
171 /* The first element of the operands of this rtx.
172 The number of operands and their types are controlled
173 by the `code' field, according to rtl.def. */
177 #define NULL_RTX (rtx) 0
179 /* Define macros to access the `code' field of the rtx. */
181 #define GET_CODE(RTX) ((RTX)->code)
182 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
184 #define GET_MODE(RTX) ((RTX)->mode)
185 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
187 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
188 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
189 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
191 /* RTL vector. These appear inside RTX's when there is a need
192 for a variable number of things. The principle use is inside
193 PARALLEL expressions. */
195 typedef struct rtvec_def{
196 int num_elem; /* number of elements */
197 struct rtx_def *elem[1];
200 #define NULL_RTVEC (rtvec) 0
202 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
203 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
205 /* 1 if X is a REG. */
207 #define REG_P(X) (GET_CODE (X) == REG)
209 /* 1 if X is a constant value that is an integer. */
211 #define CONSTANT_P(X) \
212 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
213 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
214 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
215 || GET_CODE (X) == CONSTANT_P_RTX)
217 /* General accessor macros for accessing the fields of an rtx. */
219 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
220 /* The bit with a star outside the statement expr and an & inside is
221 so that N can be evaluated only once. */
222 #define RTL_CHECK1(RTX, N, C1) __extension__ \
223 (*({ rtx _rtx = (RTX); int _n = (N); \
224 enum rtx_code _code = GET_CODE (_rtx); \
225 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
226 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
227 __PRETTY_FUNCTION__); \
228 if (GET_RTX_FORMAT(_code)[_n] != C1) \
229 rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
230 __PRETTY_FUNCTION__); \
233 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
234 (*({ rtx _rtx = (RTX); int _n = (N); \
235 enum rtx_code _code = GET_CODE (_rtx); \
236 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
237 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
238 __PRETTY_FUNCTION__); \
239 if (GET_RTX_FORMAT(_code)[_n] != C1 \
240 && GET_RTX_FORMAT(_code)[_n] != C2) \
241 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
242 __PRETTY_FUNCTION__); \
245 #define RTL_CHECKC1(RTX, N, C) __extension__ \
246 (*({ rtx _rtx = (RTX); int _n = (N); \
247 if (GET_CODE (_rtx) != C) \
248 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, \
249 __PRETTY_FUNCTION__); \
252 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
253 (*({ rtx _rtx = (RTX); int _n = (N); \
254 enum rtx_code _code = GET_CODE (_rtx); \
255 if (_code != C1 && _code != C2) \
256 rtl_check_failed_code2 (_rtx, C1, C2, __FILE__, __LINE__, \
257 __PRETTY_FUNCTION__); \
260 #define RTVEC_ELT(RTVEC, I) __extension__ \
261 (*({ rtvec _rtvec = (RTVEC); int _i = (I); \
262 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
263 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
264 __PRETTY_FUNCTION__); \
265 &_rtvec->elem[_i]; }))
267 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
268 const char *, int, const char *))
270 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
271 const char *, int, const char *))
273 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
274 const char *, int, const char *))
276 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
277 const char *, int, const char *))
279 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
280 const char *, int, const char *))
282 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
283 const char *, int, const char *))
286 #else /* not ENABLE_RTL_CHECKING */
288 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
289 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
290 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
291 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
292 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
296 #define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
297 #define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
298 #define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
299 #define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
300 #define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
301 #define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
302 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
303 #define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
304 #define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
306 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
307 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
309 /* These are like XWINT, etc. except that they expect a '0' field instead
310 of the normal type code. */
312 #define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
313 #define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
314 #define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
315 #define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
316 #define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
317 #define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
318 #define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
319 #define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
320 #define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
321 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
322 #define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
324 #define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
325 #define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
326 #define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
327 #define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
328 #define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
329 #define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
330 #define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
331 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
332 #define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
333 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
334 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
335 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
337 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
338 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
340 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
342 /* ACCESS MACROS for particular fields of insns. */
344 /* Determines whether X is an insn. */
345 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
347 /* Holds a unique number for each insn.
348 These are not necessarily sequentially increasing. */
349 #define INSN_UID(INSN) XINT(INSN, 0)
351 /* Chain insns together in sequence. */
352 #define PREV_INSN(INSN) XEXP(INSN, 1)
353 #define NEXT_INSN(INSN) XEXP(INSN, 2)
355 /* The body of an insn. */
356 #define PATTERN(INSN) XEXP(INSN, 3)
358 /* Code number of instruction, from when it was recognized.
359 -1 means this instruction has not been recognized yet. */
360 #define INSN_CODE(INSN) XINT(INSN, 4)
362 /* Set up in flow.c; empty before then.
363 Holds a chain of INSN_LIST rtx's whose first operands point at
364 previous insns with direct data-flow connections to this one.
365 That means that those insns set variables whose next use is in this insn.
366 They are always in the same basic block as this insn. */
367 #define LOG_LINKS(INSN) XEXP(INSN, 5)
369 /* 1 if insn has been deleted. */
370 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
372 /* 1 if insn is a call to a const function. */
373 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
375 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
376 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
378 /* 1 if insn is a branch that should not unconditionally execute its
379 delay slots, i.e., it is an annulled branch. */
380 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
382 /* 1 if insn is in a delay slot and is from the target of the branch. If
383 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
384 executed if the branch is taken. For annulled branches with this bit
385 clear, the insn should be executed only if the branch is not taken. */
386 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
388 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
390 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
392 /* Holds a list of notes on what this insn does to various REGs.
393 It is a chain of EXPR_LIST rtx's, where the second operand is the
394 chain pointer and the first operand is the REG being described.
395 The mode field of the EXPR_LIST contains not a real machine mode
396 but a value from enum reg_note. */
398 #define REG_NOTES(INSN) XEXP(INSN, 6)
400 /* Don't forget to change reg_note_name in rtl.c. */
403 /* The value in REG dies in this insn (i.e., it is not needed past
404 this insn). If REG is set in this insn, the REG_DEAD note may,
405 but need not, be omitted. */
408 /* The REG is autoincremented or autodecremented. */
411 /* Describes the insn as a whole; it says that the insn sets a register
412 to a constant value or to be equivalent to a memory address. If the
413 register is spilled to the stack then the constant value should be
414 substituted for it. The contents of the REG_EQUIV is the constant
415 value or memory address, which may be different from the source of
416 the SET although it has the same value. A REG_EQUIV note may also
417 appear on an insn which copies a register parameter to a pseudo-register,
418 if there is a memory address which could be used to hold that
419 pseudo-register throughout the function. */
422 /* Like REG_EQUIV except that the destination is only momentarily equal
423 to the specified rtx. Therefore, it cannot be used for substitution;
424 but it can be used for cse. */
427 /* The register set in this insn held 0 before the insn. The contents of
428 the note is the insn that stored the 0. If that insn is deleted or
429 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
430 is actually an INSN_LIST, not an EXPR_LIST. */
433 /* This insn copies the return-value of a library call out of the hard reg
434 for return values. This note is actually an INSN_LIST and it points to
435 the first insn involved in setting up arguments for the call. flow.c
436 uses this to delete the entire library call when its result is dead. */
439 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
440 and points at the one that has the REG_RETVAL. This note is also an
444 /* The register is always nonnegative during the containing loop. This is
445 used in branches so that decrement and branch instructions terminating
446 on zero can be matched. There must be an insn pattern in the md file
447 named `decrement_and_branch_until_zero' or else this will never be added
448 to any instructions. */
451 /* There is no conflict *after this insn* between the register in the note
452 and the destination of this insn. */
455 /* Identifies a register set in this insn and never used. */
458 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
459 respectively. Normally, these are required to be consecutive insns, but
460 we permit putting a cc0-setting insn in the delay slot of a branch as
461 long as only one copy of the insn exists. In that case, these notes
462 point from one to the other to allow code generation to determine what
463 any require information and to properly update CC_STATUS. These notes
465 REG_CC_SETTER, REG_CC_USER,
467 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
468 CODE_LABEL contained in the REG_LABEL note is used by the insn.
469 This note is an INSN_LIST. */
472 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
473 write-after-read and write-after-write dependencies respectively.
474 Data dependencies, which are the only type of LOG_LINK created by
475 flow, are represented by a 0 reg note kind. */
476 REG_DEP_ANTI, REG_DEP_OUTPUT,
478 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
479 -fbranch-probabilities is given. It has an integer value. For jumps,
480 it is the probability that this is a taken branch. For calls, it is
481 the probability that this call won't return. */
484 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
485 the first insn after each CALL_INSN. It indicates how many times this
486 block was executed. */
489 /* Attached to a call insn; indicates that the call is malloc-like and
490 that the pointer returned cannot alias anything else. */
493 /* Used to optimize rtl generated by dynamic stack allocations for targets
494 where SETJMP_VIA_SAVE_AREA is true. */
497 /* Attached to JUMP_INSNs only, it holds the branch prediction flags
498 computed by get_jump_flags() after dbr scheduling is complete. */
501 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
502 for DWARF to interpret what they imply. The attached rtx is used
503 instead of intuition. */
504 REG_FRAME_RELATED_EXPR,
506 /* Indicates that REG holds the exception context for the function.
507 This context is shared by inline functions, so the code to acquire
508 the real exception context is delayed until after inlining. */
511 /* Indicates what exception region an INSN belongs in. This is used to
512 indicate what region to which a call may throw. REGION 0 indicates
513 that a call cannot throw at all. REGION -1 indicates that it cannot
514 throw, nor will it execute a non-local goto. */
517 /* Indicates that a call is actually a call to rethrow, and specifies the
518 rethrow symbol for the region the rethrow is targetting. This provides
519 a way to generate the non standard flow edges required for a rethrow. */
522 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
526 /* The base value for branch probability notes. */
527 #define REG_BR_PROB_BASE 10000
529 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
530 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
531 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
533 /* Names for REG_NOTE's in EXPR_LIST insn's. */
535 extern const char * const reg_note_name[];
536 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
538 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
539 USE and CLOBBER expressions.
540 USE expressions list the registers filled with arguments that
541 are passed to the function.
542 CLOBBER expressions document the registers explicitly clobbered
544 Pseudo registers can not be mentioned in this list. */
545 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
547 /* The label-number of a code-label. The assembler label
548 is made from `L' and the label-number printed in decimal.
549 Label numbers are unique in a compilation. */
550 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
552 #define LINE_NUMBER NOTE
554 /* In a NOTE that is a line number, this is a string for the file name that the
555 line is in. We use the same field to record block numbers temporarily in
556 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
557 between ints and pointers if we use a different macro for the block number.)
558 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
559 information as a rtx in the field. */
561 #define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
562 #define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
563 #define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
564 #define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
565 #define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
566 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
567 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
569 /* In a NOTE that is a line number, this is the line number.
570 Other kinds of NOTEs are identified by negative numbers here. */
571 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
573 /* Codes that appear in the NOTE_LINE_NUMBER field
574 for kinds of notes that are not line numbers.
576 Notice that we do not try to use zero here for any of
577 the special note codes because sometimes the source line
578 actually can be zero! This happens (for example) when we
579 are generating code for the per-translation-unit constructor
580 and destructor routines for some C++ translation unit.
582 If you should change any of the following values, or if you
583 should add a new value here, don't forget to change the
584 note_insn_name array in rtl.c. */
588 /* Keep all of these numbers negative. Adjust as needed. */
589 NOTE_INSN_BIAS = -100,
591 /* This note is used to get rid of an insn
592 when it isn't safe to patch the insn out of the chain. */
595 /* These are used to mark the beginning and end of a lexical block.
596 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
600 /* These mark the extremes of a loop. */
604 /* Generated at the place in a loop that `continue' jumps to. */
606 /* Generated at the start of a duplicated exit test. */
609 /* This kind of note is generated at the end of the function body,
610 just before the return insn or return label. In an optimizing
611 compilation it is deleted by the first jump optimization, after
612 enabling that optimizer to determine whether control can fall
613 off the end of the function body without a return statement. */
614 NOTE_INSN_FUNCTION_END,
616 /* This kind of note is generated just after each call to `setjmp',
617 and similar functions that can return twice. */
620 /* This marks the point immediately after the last prologue insn. */
621 NOTE_INSN_PROLOGUE_END,
623 /* This marks the point immediately prior to the first epilogue insn. */
624 NOTE_INSN_EPILOGUE_BEG,
626 /* Generated in place of user-declared labels when they are deleted. */
627 NOTE_INSN_DELETED_LABEL,
629 /* This note indicates the start of the real body of the function,
630 i.e. the point just after all of the parms have been moved into
632 NOTE_INSN_FUNCTION_BEG,
634 /* These note where exception handling regions begin and end.
635 Uses NOTE_EH_HANDLER to identify the region in question. */
636 NOTE_INSN_EH_REGION_BEG,
637 NOTE_INSN_EH_REGION_END,
639 /* Generated whenever a duplicate line number note is output. For example,
640 one is output after the end of an inline function, in order to prevent
641 the line containing the inline call from being counted twice in gcov. */
642 NOTE_INSN_REPEATED_LINE_NUMBER,
644 /* Start/end of a live range region, where pseudos allocated on the stack
645 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
649 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
652 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
653 NOTE_INSN_BASIC_BLOCK,
655 /* Record the expected value of a register at a location. Uses
656 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
657 NOTE_INSN_EXPECTED_VALUE,
662 /* Names for NOTE insn's other than line numbers. */
664 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
665 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
666 (note_insn_name[(NOTE_CODE) - NOTE_INSN_BIAS])
668 /* The name of a label, in case it corresponds to an explicit label
669 in the input source code. */
670 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
672 /* In jump.c, each label contains a count of the number
673 of LABEL_REFs that point at it, so unused labels can be deleted. */
674 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
676 /* Associate a name with a CODE_LABEL. */
677 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
679 /* The original regno this ADDRESSOF was built for. */
680 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
682 /* The variable in the register we took the address of. */
683 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
685 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
686 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
687 be decremented and possibly the label can be deleted. */
688 #define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
690 /* Once basic blocks are found in flow.c,
691 each CODE_LABEL starts a chain that goes through
692 all the LABEL_REFs that jump to that label.
693 The chain eventually winds up at the CODE_LABEL: it is circular. */
694 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
696 /* This is the field in the LABEL_REF through which the circular chain
697 of references to a particular label is linked.
698 This chain is set up in flow.c. */
700 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
702 /* Once basic blocks are found in flow.c,
703 Each LABEL_REF points to its containing instruction with this field. */
705 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
707 /* For a REG rtx, REGNO extracts the register number. */
709 #define REGNO(RTX) XCUINT(RTX, 0, REG)
711 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
712 is the current function's return value. */
714 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
716 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
717 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
719 /* For a CONST_INT rtx, INTVAL extracts the integer. */
721 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
723 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
724 SUBREG_WORD extracts the word-number. */
726 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
727 #define SUBREG_WORD(RTX) XCUINT(RTX, 1, SUBREG)
729 /* 1 if the REG contained in SUBREG_REG is already known to be
730 sign- or zero-extended from the mode of the SUBREG to the mode of
731 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
734 When used as a LHS, is means that this extension must be done
735 when assigning to SUBREG_REG. */
737 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
738 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
740 /* Access various components of an ASM_OPERANDS rtx. */
742 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
743 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
744 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
745 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
746 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
747 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
748 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
749 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
750 #define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
751 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
752 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
754 /* For a MEM rtx, 1 if it's a volatile reference.
755 Also in an ASM_OPERANDS rtx. */
756 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
758 /* For a MEM rtx, 1 if it refers to a field of an aggregate. If zero,
759 RTX may or may not refer to a field of an aggregate. */
760 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
762 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
763 not refer to a scalar.*/
764 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
766 /* Copy the attributes that apply to memory locations from RHS to LHS. */
767 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
768 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
769 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
770 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
771 MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS), \
772 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
774 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
775 RTX. Otherwise, vice versa. Use this macro only when you are
776 *sure* that you know that the MEM is in a structure, or is a
777 scalar. VAL is evaluated only once. */
778 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
781 MEM_IN_STRUCT_P (RTX) = 1; \
782 MEM_SCALAR_P (RTX) = 0; \
786 MEM_IN_STRUCT_P (RTX) = 0; \
787 MEM_SCALAR_P (RTX) = 1; \
791 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
792 set, and may alias anything. Otherwise, the MEM can only alias
793 MEMs in the same alias set. This value is set in a
794 language-dependent manner in the front-end, and should not be
795 altered in the back-end. These set numbers are tested for zero,
796 and compared for equality; they have no other significance. In
797 some front-ends, these numbers may correspond in some way to types,
798 or other language-level entities, but they need not, and the
799 back-end makes no such assumptions. */
800 #define MEM_ALIAS_SET(RTX) XCINT(RTX, 1, MEM)
802 /* For a LABEL_REF, 1 means that this reference is to a label outside the
803 loop containing the reference. */
804 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
806 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
807 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
808 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
810 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
811 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
813 /* For a REG, 1 means the register is used only in an exit test of a loop. */
814 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
816 /* During sched, for an insn, 1 means that the insn must be scheduled together
817 with the preceding insn. */
818 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
820 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
821 cost of the dependence link. The cost of executing an instruction
822 may vary based on how the results are used. LINK_COST_ZERO is 1 when
823 the cost through the link varies and is unchanged (i.e., the link has
824 zero additional cost). LINK_COST_FREE is 1 when the cost through the
825 link is zero (i.e., the link makes the cost free). In other cases,
826 the adjustment to the cost is recomputed each time it is needed. */
827 #define LINK_COST_ZERO(X) ((X)->jump)
828 #define LINK_COST_FREE(X) ((X)->call)
830 /* For a SET rtx, SET_DEST is the place that is set
831 and SET_SRC is the value it is set to. */
832 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
833 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
835 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
836 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
837 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
839 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
840 conditionally executing the code on, COND_EXEC_CODE is the code
841 to execute if the condition is true. */
842 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
843 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
845 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
846 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
848 /* Flag in a SYMBOL_REF for machine-specific purposes. */
849 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
851 /* 1 in a SYMBOL_REF if it represents a symbol which might have to change
852 if its inlined or unrolled. */
853 #define SYMBOL_REF_NEED_ADJUST(RTX) ((RTX)->in_struct)
855 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
856 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
858 /* Define a macro to look for REG_INC notes,
859 but save time on machines where they never exist. */
861 /* Don't continue this line--convex cc version 4.1 would lose. */
862 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
863 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
865 #define FIND_REG_INC_NOTE(insn, reg) 0
868 /* Indicate whether the machine has any sort of auto increment addressing.
869 If not, we can avoid checking for REG_INC notes. */
871 /* Don't continue this line--convex cc version 4.1 would lose. */
872 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
876 #ifndef HAVE_PRE_INCREMENT
877 #define HAVE_PRE_INCREMENT 0
880 #ifndef HAVE_PRE_DECREMENT
881 #define HAVE_PRE_DECREMENT 0
884 #ifndef HAVE_POST_INCREMENT
885 #define HAVE_POST_INCREMENT 0
888 #ifndef HAVE_POST_DECREMENT
889 #define HAVE_POST_DECREMENT 0
893 /* Some architectures do not have complete pre/post increment/decrement
894 instruction sets, or only move some modes efficiently. These macros
895 allow us to tune autoincrement generation. */
897 #ifndef USE_LOAD_POST_INCREMENT
898 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
901 #ifndef USE_LOAD_POST_DECREMENT
902 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
905 #ifndef USE_LOAD_PRE_INCREMENT
906 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
909 #ifndef USE_LOAD_PRE_DECREMENT
910 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
913 #ifndef USE_STORE_POST_INCREMENT
914 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
917 #ifndef USE_STORE_POST_DECREMENT
918 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
921 #ifndef USE_STORE_PRE_INCREMENT
922 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
925 #ifndef USE_STORE_PRE_DECREMENT
926 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
930 /* Accessors for RANGE_INFO. */
931 /* For RANGE_{START,END} notes return the RANGE_START note. */
932 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
934 /* For RANGE_{START,END} notes return the RANGE_START note. */
935 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
937 /* For RANGE_{START,END} notes, return the vector containing the registers used
939 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
940 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
941 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
943 /* For RANGE_{START,END} notes, the number of calls within the range. */
944 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
946 /* For RANGE_{START,END} notes, the number of insns within the range. */
947 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
949 /* For RANGE_{START,END} notes, a unique # to identify this range. */
950 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
952 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
953 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
955 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
956 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
958 /* For RANGE_{START,END} notes, the loop depth the range is in. */
959 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
961 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
963 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
965 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
967 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
969 /* For RANGE_START notes, the marker # of the start of the range. */
970 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
972 /* For RANGE_START notes, the marker # of the end of the range. */
973 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
975 /* Original pseudo register # for a live range note. */
976 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
978 /* Pseudo register # original register is copied into or -1. */
979 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
981 /* How many times a register in a live range note was referenced. */
982 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
984 /* How many times a register in a live range note was set. */
985 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
987 /* How many times a register in a live range note died. */
988 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
990 /* Whether the original value is needed to be copied into the range register at
991 the start of the range. */
992 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
994 /* # of insns the register copy is live over. */
995 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
997 /* # of calls the register copy is live over. */
998 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1000 /* DECL_NODE pointer of the declaration if the register is a user defined
1002 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1004 /* BLOCK_NODE pointer to the block the variable is declared in if the
1005 register is a user defined variable. */
1006 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1008 /* EXPR_LIST of the distinct ranges a variable is in. */
1009 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1011 /* Block a variable is declared in. */
1012 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1014 /* # of distinct ranges a variable is in. */
1015 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1017 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1018 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1020 /* For a NOTE_INSN_LIVE note, the original basic block number. */
1021 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1023 /* Determine if the insn is a PHI node. */
1024 #define PHI_NODE_P(X) \
1025 (X && GET_CODE (X) == INSN \
1026 && GET_CODE (PATTERN (X)) == SET \
1027 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1029 /* Nonzero if we need to distinguish between the return value of this function
1030 and the return value of a function called by this function. This helps
1032 This is 1 until after the rtl generation pass. */
1033 extern int rtx_equal_function_value_matters;
1035 /* Generally useful functions. */
1037 /* The following functions accept a wide integer argument. Rather than
1038 having to cast on every function call, we use a macro instead, that is
1039 defined here and in tree.h. */
1042 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
1043 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
1045 extern int exact_log2_wide PARAMS ((unsigned HOST_WIDE_INT));
1046 extern int floor_log2_wide PARAMS ((unsigned HOST_WIDE_INT));
1049 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1051 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1053 #define plus_constant_for_output(X,C) \
1054 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
1057 extern void set_stack_check_libfunc PARAMS ((rtx));
1058 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1059 enum machine_mode));
1060 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1061 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1062 extern void optimize_save_area_alloca PARAMS ((rtx));
1064 extern rtx gen_rtx PARAMS ((enum rtx_code,
1065 enum machine_mode, ...));
1066 extern rtvec gen_rtvec PARAMS ((int, ...));
1068 extern char *oballoc PARAMS ((int));
1069 extern char *permalloc PARAMS ((int));
1070 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1071 extern rtvec rtvec_alloc PARAMS ((int));
1072 extern rtx copy_insn_1 PARAMS ((rtx));
1073 extern rtx copy_insn PARAMS ((rtx));
1074 extern rtx copy_rtx PARAMS ((rtx));
1075 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1076 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1077 extern rtx shallow_copy_rtx PARAMS ((rtx));
1078 extern int rtx_equal_p PARAMS ((rtx, rtx));
1079 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1080 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1081 extern rtx gen_label_rtx PARAMS ((void));
1082 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1083 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1084 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1085 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1086 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1087 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1088 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1089 enum machine_mode));
1090 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1091 enum machine_mode));
1092 extern int subreg_lowpart_p PARAMS ((rtx));
1093 extern rtx make_safe_from PARAMS ((rtx, rtx));
1094 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1095 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
1096 extern rtx get_insns PARAMS ((void));
1097 extern const char *get_insn_name PARAMS ((int));
1098 extern rtx get_last_insn PARAMS ((void));
1099 extern rtx get_last_insn_anywhere PARAMS ((void));
1100 extern void start_sequence PARAMS ((void));
1101 extern void push_to_sequence PARAMS ((rtx));
1102 extern void end_sequence PARAMS ((void));
1103 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1104 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1105 extern rtx gen_sequence PARAMS ((void));
1106 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1107 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1108 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
1109 extern rtx get_pool_constant PARAMS ((rtx));
1110 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1111 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1112 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1113 extern int get_pool_offset PARAMS ((rtx));
1114 extern rtx simplify_subtraction PARAMS ((rtx));
1115 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1116 HOST_WIDE_INT, int));
1117 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1118 HOST_WIDE_INT, int));
1119 extern rtx assign_temp PARAMS ((union tree_node *,
1121 extern rtx protect_from_queue PARAMS ((rtx, int));
1122 extern void emit_queue PARAMS ((void));
1123 extern rtx emit_move_insn PARAMS ((rtx, rtx));
1124 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1125 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1126 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1127 extern rtx emit_barrier_before PARAMS ((rtx));
1128 extern rtx emit_label_before PARAMS ((rtx, rtx));
1129 extern rtx emit_note_before PARAMS ((int, rtx));
1130 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1131 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1132 extern rtx emit_barrier_after PARAMS ((rtx));
1133 extern rtx emit_label_after PARAMS ((rtx, rtx));
1134 extern rtx emit_note_after PARAMS ((int, rtx));
1135 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1136 extern rtx emit_insn PARAMS ((rtx));
1137 extern rtx emit_insns PARAMS ((rtx));
1138 extern rtx emit_insns_before PARAMS ((rtx, rtx));
1139 extern rtx emit_insns_after PARAMS ((rtx, rtx));
1140 extern rtx emit_jump_insn PARAMS ((rtx));
1141 extern rtx emit_call_insn PARAMS ((rtx));
1142 extern rtx emit_label PARAMS ((rtx));
1143 extern rtx emit_barrier PARAMS ((void));
1144 extern rtx emit_line_note PARAMS ((const char *, int));
1145 extern rtx emit_note PARAMS ((const char *, int));
1146 extern rtx emit_line_note_force PARAMS ((const char *, int));
1147 extern rtx make_insn_raw PARAMS ((rtx));
1148 extern rtx previous_insn PARAMS ((rtx));
1149 extern rtx next_insn PARAMS ((rtx));
1150 extern rtx prev_nonnote_insn PARAMS ((rtx));
1151 extern rtx next_nonnote_insn PARAMS ((rtx));
1152 extern rtx prev_real_insn PARAMS ((rtx));
1153 extern rtx next_real_insn PARAMS ((rtx));
1154 extern rtx prev_active_insn PARAMS ((rtx));
1155 extern rtx next_active_insn PARAMS ((rtx));
1156 extern int active_insn_p PARAMS ((rtx));
1157 extern rtx prev_label PARAMS ((rtx));
1158 extern rtx next_label PARAMS ((rtx));
1159 extern rtx next_cc0_user PARAMS ((rtx));
1160 extern rtx prev_cc0_setter PARAMS ((rtx));
1161 extern rtx next_nondeleted_insn PARAMS ((rtx));
1162 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1163 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1164 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1165 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1166 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1167 extern rtx find_equiv_reg PARAMS ((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
1168 extern rtx squeeze_notes PARAMS ((rtx, rtx));
1169 extern rtx delete_insn PARAMS ((rtx));
1170 extern void delete_jump PARAMS ((rtx));
1171 extern void delete_barrier PARAMS ((rtx));
1172 extern rtx get_label_before PARAMS ((rtx));
1173 extern rtx get_label_after PARAMS ((rtx));
1174 extern rtx follow_jumps PARAMS ((rtx));
1175 extern rtx adj_offsettable_operand PARAMS ((rtx, int));
1176 extern rtx try_split PARAMS ((rtx, rtx, int));
1177 extern rtx split_insns PARAMS ((rtx, rtx));
1178 extern rtx simplify_unary_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
1179 extern rtx simplify_binary_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, rtx));
1180 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
1181 extern rtx simplify_relational_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, rtx));
1182 extern rtx simplify_gen_binary PARAMS ((enum rtx_code, enum machine_mode,
1184 extern rtx simplify_rtx PARAMS ((rtx));
1185 extern rtx gen_move_insn PARAMS ((rtx, rtx));
1186 extern rtx gen_jump PARAMS ((rtx));
1187 extern rtx gen_beq PARAMS ((rtx));
1188 extern rtx gen_bge PARAMS ((rtx));
1189 extern rtx gen_ble PARAMS ((rtx));
1190 extern rtx gen_mem_addressof PARAMS ((rtx, union tree_node *));
1191 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
1192 extern rtx expand_complex_abs PARAMS ((enum machine_mode, rtx, rtx,
1194 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1196 extern void set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1198 /* Functions in rtlanal.c */
1200 extern int rtx_unstable_p PARAMS ((rtx));
1201 extern int rtx_varies_p PARAMS ((rtx));
1202 extern int rtx_addr_varies_p PARAMS ((rtx));
1203 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1204 extern rtx get_related_value PARAMS ((rtx));
1205 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1206 extern int reg_referenced_p PARAMS ((rtx, rtx));
1207 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1208 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1209 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1210 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1211 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1212 extern int no_labels_between_p PARAMS ((rtx, rtx));
1213 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1214 extern int modified_in_p PARAMS ((rtx, rtx));
1215 extern int insn_dependant_p PARAMS ((rtx, rtx));
1216 extern int reg_set_p PARAMS ((rtx, rtx));
1217 extern rtx single_set PARAMS ((rtx));
1218 extern int multiple_sets PARAMS ((rtx));
1219 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1220 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1222 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1223 extern void note_stores PARAMS ((rtx,
1224 void (*) (rtx, rtx, void *),
1226 extern rtx reg_set_last PARAMS ((rtx, rtx));
1227 extern int dead_or_set_p PARAMS ((rtx, rtx));
1228 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1229 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1230 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1232 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1233 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1235 extern void remove_note PARAMS ((rtx, rtx));
1236 extern int side_effects_p PARAMS ((rtx));
1237 extern int volatile_refs_p PARAMS ((rtx));
1238 extern int volatile_insn_p PARAMS ((rtx));
1239 extern int may_trap_p PARAMS ((rtx));
1240 extern int inequality_comparisons_p PARAMS ((rtx));
1241 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1242 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1244 extern int computed_jump_p PARAMS ((rtx));
1245 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1246 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1247 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1248 extern int auto_inc_p PARAMS ((rtx));
1249 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1250 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1254 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1255 void init_EXPR_INSN_LIST_cache PARAMS ((void));
1256 void free_EXPR_LIST_list PARAMS ((rtx *));
1257 void free_INSN_LIST_list PARAMS ((rtx *));
1258 void free_EXPR_LIST_node PARAMS ((rtx));
1259 void free_INSN_LIST_node PARAMS ((rtx));
1260 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1261 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1262 void clear_log_links PARAMS ((rtx));
1266 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1267 Always at least 3, since the combiner could put that many togetherm
1268 and we want this to remain correct for all the remaining passes. */
1270 extern int max_parallel;
1272 /* Free up register info memory. */
1273 extern void free_reg_info PARAMS ((void));
1276 extern int asm_noperands PARAMS ((rtx));
1277 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1279 enum machine_mode *));
1281 extern enum reg_class reg_preferred_class PARAMS ((int));
1282 extern enum reg_class reg_alternate_class PARAMS ((int));
1284 extern rtx get_first_nonparm_insn PARAMS ((void));
1286 extern void split_all_insns PARAMS ((int));
1288 #define MAX_SAVED_CONST_INT 64
1289 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1291 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1292 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1293 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1294 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1295 extern rtx const_true_rtx;
1297 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1299 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1300 same as VOIDmode. */
1302 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1304 /* Likewise, for the constants 1 and 2. */
1306 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1307 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1309 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1310 is used to represent the frame pointer. This is because the
1311 hard frame pointer and the automatic variables are separated by an amount
1312 that cannot be determined until after register allocation. We can assume
1313 that in this case ELIMINABLE_REGS will be defined, one action of which
1314 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1315 #ifndef HARD_FRAME_POINTER_REGNUM
1316 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1319 /* Index labels for global_rtl. */
1320 enum global_rtl_index
1326 /* For register elimination to work properly these hard_frame_pointer_rtx,
1327 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1328 the same register. */
1329 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1330 GR_ARG_POINTER = GR_FRAME_POINTER,
1332 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1333 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1335 GR_HARD_FRAME_POINTER,
1337 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1338 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1339 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1344 GR_VIRTUAL_INCOMING_ARGS,
1345 GR_VIRTUAL_STACK_ARGS,
1346 GR_VIRTUAL_STACK_DYNAMIC,
1347 GR_VIRTUAL_OUTGOING_ARGS,
1353 /* Pointers to standard pieces of rtx are stored here. */
1354 extern rtx global_rtl[GR_MAX];
1356 /* Standard pieces of rtx, to be substituted directly into things. */
1357 #define pc_rtx (global_rtl[GR_PC])
1358 #define cc0_rtx (global_rtl[GR_CC0])
1360 /* All references to certain hard regs, except those created
1361 by allocating pseudo regs into them (when that's possible),
1362 go through these unique rtx objects. */
1363 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1364 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1365 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1366 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1368 extern rtx pic_offset_table_rtx;
1369 extern rtx struct_value_rtx;
1370 extern rtx struct_value_incoming_rtx;
1371 extern rtx static_chain_rtx;
1372 extern rtx static_chain_incoming_rtx;
1373 extern rtx return_address_pointer_rtx;
1375 /* Include the RTL generation functions. */
1381 /* There are some RTL codes that require special attention; the
1382 generation functions included above do the raw handling. If you
1383 add to this list, modify special_rtx in gengenrtl.c as well. You
1384 should also modify gen_rtx to use the special function. */
1386 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1387 HOST_WIDE_INT, HOST_WIDE_INT));
1388 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1389 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1390 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1392 /* We need the cast here to ensure that we get the same result both with
1393 and without prototypes. */
1394 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1396 /* Virtual registers are used during RTL generation to refer to locations into
1397 the stack frame when the actual location isn't known until RTL generation
1398 is complete. The routine instantiate_virtual_regs replaces these with
1399 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1402 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1404 /* This points to the first word of the incoming arguments passed on the stack,
1405 either by the caller or by the callee when pretending it was passed by the
1408 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1410 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1412 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1413 variable on the stack. Otherwise, it points to the first variable on
1416 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1418 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1420 /* This points to the location of dynamically-allocated memory on the stack
1421 immediately after the stack pointer has been adjusted by the amount
1424 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1426 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1428 /* This points to the location in the stack at which outgoing arguments should
1429 be written when the stack is pre-pushed (arguments pushed using push
1430 insns always use sp). */
1432 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1434 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1436 /* This points to the Canonical Frame Address of the function. This
1437 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1438 but is calculated relative to the arg pointer for simplicity; the
1439 frame pointer nor stack pointer are necessarily fixed relative to
1440 the CFA until after reload. */
1442 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1444 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1446 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1448 extern rtx find_next_ref PARAMS ((rtx, rtx));
1449 extern rtx *find_single_use PARAMS ((rtx, rtx, rtx *));
1451 extern rtx output_constant_def PARAMS ((union tree_node *));
1452 extern rtx immed_real_const PARAMS ((union tree_node *));
1453 extern union tree_node *make_tree PARAMS ((union tree_node *, rtx));
1455 /* Define a default value for STORE_FLAG_VALUE. */
1457 #ifndef STORE_FLAG_VALUE
1458 #define STORE_FLAG_VALUE 1
1461 /* Nonzero after the second flow pass has completed.
1462 Set to 1 or 0 by toplev.c */
1463 extern int flow2_completed;
1465 /* Nonzero after end of reload pass.
1466 Set to 1 or 0 by reload1.c. */
1468 extern int reload_completed;
1470 /* Set to 1 while reload_as_needed is operating.
1471 Required by some machines to handle any generated moves differently. */
1473 extern int reload_in_progress;
1475 /* If this is nonzero, we do not bother generating VOLATILE
1476 around volatile memory references, and we are willing to
1477 output indirect addresses. If cse is to follow, we reject
1478 indirect addresses so a useful potential cse is generated;
1479 if it is used only once, instruction combination will produce
1480 the same indirect address eventually. */
1481 extern int cse_not_expected;
1483 /* Set to nonzero before life analysis to indicate that it is unsafe to
1484 generate any new pseudo registers. */
1485 extern int no_new_pseudos;
1487 /* Translates rtx code to tree code, for those codes needed by
1488 REAL_ARITHMETIC. The function returns an int because the caller may not
1489 know what `enum tree_code' means. */
1491 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1494 extern void obfree PARAMS ((char *));
1496 extern void gcc_obstack_init PARAMS ((struct obstack *));
1497 extern void pop_obstacks PARAMS ((void));
1498 extern void push_obstacks PARAMS ((struct obstack *,
1501 struct cse_basic_block_data;
1502 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1503 extern int address_cost PARAMS ((rtx, enum machine_mode));
1504 extern void delete_trivially_dead_insns PARAMS ((rtx, int));
1506 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1508 extern void cse_end_of_basic_block PARAMS ((rtx,
1509 struct cse_basic_block_data *,
1513 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1514 extern int condjump_p PARAMS ((rtx));
1515 extern int any_condjump_p PARAMS ((rtx));
1516 extern int any_uncondjump_p PARAMS ((rtx));
1517 extern int safe_to_remove_jump_p PARAMS ((rtx));
1518 extern rtx pc_set PARAMS ((rtx));
1519 extern rtx condjump_label PARAMS ((rtx));
1520 extern int simplejump_p PARAMS ((rtx));
1521 extern int returnjump_p PARAMS ((rtx));
1522 extern int onlyjump_p PARAMS ((rtx));
1523 extern int sets_cc0_p PARAMS ((rtx));
1524 extern int invert_jump_1 PARAMS ((rtx, rtx));
1525 extern int invert_jump PARAMS ((rtx, rtx, int));
1526 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1527 extern int true_regnum PARAMS ((rtx));
1528 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1529 extern int redirect_jump PARAMS ((rtx, rtx, int));
1530 extern void jump_optimize PARAMS ((rtx, int, int, int));
1531 extern void jump_optimize_minimal PARAMS ((rtx));
1532 extern void rebuild_jump_labels PARAMS ((rtx));
1533 extern void thread_jumps PARAMS ((rtx, int, int));
1534 extern int redirect_exp PARAMS ((rtx *, rtx, rtx, rtx));
1535 extern int rtx_equal_for_thread_p PARAMS ((rtx, rtx, rtx));
1536 extern int invert_exp PARAMS ((rtx, rtx));
1537 extern int can_reverse_comparison_p PARAMS ((rtx, rtx));
1538 extern void delete_for_peephole PARAMS ((rtx, rtx));
1539 extern int condjump_in_parallel_p PARAMS ((rtx));
1540 extern void never_reached_warning PARAMS ((rtx));
1542 /* Flags for jump_optimize() */
1543 #define JUMP_CROSS_JUMP 1
1544 #define JUMP_CROSS_JUMP_DEATH_MATTERS 2
1545 #define JUMP_NOOP_MOVES 1
1546 #define JUMP_AFTER_REGSCAN 1
1548 /* In emit-rtl.c. */
1549 extern int max_reg_num PARAMS ((void));
1550 extern int max_label_num PARAMS ((void));
1551 extern int get_first_label_num PARAMS ((void));
1552 extern void delete_insns_since PARAMS ((rtx));
1553 extern void mark_reg_pointer PARAMS ((rtx, int));
1554 extern void mark_user_reg PARAMS ((rtx));
1555 extern void reset_used_flags PARAMS ((rtx));
1556 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1557 extern int get_max_uid PARAMS ((void));
1558 extern int in_sequence_p PARAMS ((void));
1559 extern void force_next_line_note PARAMS ((void));
1560 extern void clear_emit_caches PARAMS ((void));
1561 extern void init_emit PARAMS ((void));
1562 extern void init_emit_once PARAMS ((int));
1563 extern void push_topmost_sequence PARAMS ((void));
1564 extern void pop_topmost_sequence PARAMS ((void));
1565 extern int subreg_realpart_p PARAMS ((rtx));
1566 extern void reverse_comparison PARAMS ((rtx));
1567 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1568 extern void set_new_first_and_last_label_num PARAMS ((int, int));
1569 extern void set_new_last_label_num PARAMS ((int));
1570 extern void unshare_all_rtl_again PARAMS ((rtx));
1571 extern void set_last_insn PARAMS ((rtx));
1572 extern void link_cc0_insns PARAMS ((rtx));
1573 extern void add_insn PARAMS ((rtx));
1574 extern void add_insn_before PARAMS ((rtx, rtx));
1575 extern void add_insn_after PARAMS ((rtx, rtx));
1576 extern void remove_insn PARAMS ((rtx));
1577 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1578 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1579 extern enum rtx_code classify_insn PARAMS ((rtx));
1580 extern rtx emit PARAMS ((rtx));
1581 /* Query and clear/ restore no_line_numbers. This is used by the
1582 switch / case handling in stmt.c to give proper line numbers in
1583 warnings about unreachable code. */
1584 int force_line_numbers PARAMS ((void));
1585 void restore_line_number_status PARAMS ((int old_value));
1586 extern void renumber_insns PARAMS ((FILE *));
1587 extern void remove_unnecessary_notes PARAMS ((void));
1589 /* In insn-emit.c */
1590 extern void add_clobbers PARAMS ((rtx, int));
1593 extern int combine_instructions PARAMS ((rtx, unsigned int));
1594 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
1595 extern rtx remove_death PARAMS ((unsigned int, rtx));
1597 extern void dump_combine_stats PARAMS ((FILE *));
1598 extern void dump_combine_total_stats PARAMS ((FILE *));
1603 extern void schedule_insns PARAMS ((FILE *));
1605 extern void fix_sched_param PARAMS ((const char *, const char *));
1607 /* In print-rtl.c */
1608 extern void debug_rtx PARAMS ((rtx));
1609 extern void debug_rtx_list PARAMS ((rtx, int));
1610 extern void debug_rtx_range PARAMS ((rtx, rtx));
1611 extern rtx debug_rtx_find PARAMS ((rtx, int));
1613 extern void print_rtl PARAMS ((FILE *, rtx));
1614 extern int print_rtl_single PARAMS ((FILE *, rtx));
1615 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
1619 extern void init_loop PARAMS ((void));
1620 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
1622 extern void loop_optimize PARAMS ((rtx, FILE *, int));
1624 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
1627 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
1628 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
1629 extern int prologue_epilogue_contains PARAMS ((rtx));
1630 extern int sibcall_epilogue_contains PARAMS ((rtx));
1631 extern HOST_WIDE_INT get_frame_size PARAMS ((void));
1632 extern void preserve_rtl_expr_result PARAMS ((rtx));
1633 extern void mark_temp_addr_taken PARAMS ((rtx));
1634 extern void update_temp_slot_address PARAMS ((rtx, rtx));
1635 extern void purge_addressof PARAMS ((rtx));
1638 extern int operands_match_p PARAMS ((rtx, rtx));
1639 extern int safe_from_earlyclobber PARAMS ((rtx, rtx));
1642 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
1643 extern void expand_null_return PARAMS ((void));
1644 extern void emit_jump PARAMS ((rtx));
1645 extern int preserve_subexpressions_p PARAMS ((void));
1648 extern void init_expr_once PARAMS ((void));
1649 extern void move_by_pieces PARAMS ((rtx, rtx, int, unsigned int));
1652 extern void allocate_bb_life_data PARAMS ((void));
1653 extern void allocate_reg_life_data PARAMS ((void));
1654 extern void recompute_reg_usage PARAMS ((rtx, int));
1656 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
1657 extern void dump_flow_info PARAMS ((FILE *));
1661 extern void init_expmed PARAMS ((void));
1662 extern void expand_inc PARAMS ((rtx, rtx));
1663 extern void expand_dec PARAMS ((rtx, rtx));
1664 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
1665 unsigned HOST_WIDE_INT, rtx,
1670 extern int gcse_main PARAMS ((rtx, FILE *));
1674 extern void mark_elimination PARAMS ((int, int));
1676 extern int global_alloc PARAMS ((FILE *));
1677 extern void dump_global_regs PARAMS ((FILE *));
1680 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
1682 extern void build_insn_chain PARAMS ((rtx));
1685 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
1686 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
1687 extern void globalize_reg PARAMS ((int));
1688 extern void init_regs PARAMS ((void));
1689 extern void init_reg_sets PARAMS ((void));
1690 extern void regset_release_memory PARAMS ((void));
1691 extern void regclass_init PARAMS ((void));
1692 extern void regclass PARAMS ((rtx, int, FILE *));
1693 extern void reg_scan PARAMS ((rtx, unsigned int, int));
1694 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
1695 extern void fix_register PARAMS ((const char *, int, int));
1697 extern void delete_null_pointer_checks PARAMS ((rtx));
1701 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
1703 extern void combine_stack_adjustments PARAMS ((void));
1707 extern void dbr_schedule PARAMS ((rtx, FILE *));
1711 extern void init_optabs PARAMS ((void));
1713 /* In local-alloc.c */
1715 extern void dump_local_alloc PARAMS ((FILE *));
1717 extern int local_alloc PARAMS ((void));
1718 extern int function_invariant_p PARAMS ((rtx));
1721 extern void reload_cse_regs PARAMS ((rtx));
1722 extern void init_reload PARAMS ((void));
1723 extern void mark_home_live PARAMS ((int));
1725 extern int reload PARAMS ((rtx, int, FILE *));
1728 /* In caller-save.c */
1729 extern void init_caller_save PARAMS ((void));
1732 extern void init_branch_prob PARAMS ((const char *));
1734 extern void branch_prob PARAMS ((rtx, FILE *));
1735 extern void end_branch_prob PARAMS ((FILE *));
1737 extern void output_func_start_profiler PARAMS ((void));
1739 /* In reg-stack.c */
1741 extern void reg_to_stack PARAMS ((rtx, FILE *));
1744 /* In fold-const.c */
1745 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1746 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1747 unsigned HOST_WIDE_INT *,
1749 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1750 unsigned HOST_WIDE_INT *,
1752 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
1754 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1755 unsigned HOST_WIDE_INT *,
1757 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1758 HOST_WIDE_INT, unsigned int,
1759 unsigned HOST_WIDE_INT *,
1760 HOST_WIDE_INT *, int));
1761 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1762 HOST_WIDE_INT, unsigned int,
1763 unsigned HOST_WIDE_INT *,
1764 HOST_WIDE_INT *, int));
1765 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1766 HOST_WIDE_INT, unsigned int,
1767 unsigned HOST_WIDE_INT *,
1769 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1770 HOST_WIDE_INT, unsigned int,
1771 unsigned HOST_WIDE_INT *,
1775 extern void emit_library_call PARAMS ((rtx, int, enum machine_mode,
1777 extern rtx emit_library_call_value PARAMS ((rtx, rtx, int,
1782 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
1785 extern void bss_section PARAMS ((void));
1786 extern int in_data_section PARAMS ((void));
1787 extern int supports_one_only PARAMS ((void));
1788 extern void init_varasm_once PARAMS ((void));
1791 extern void init_rtl PARAMS ((void));
1792 extern void rtx_free PARAMS ((rtx));
1795 extern int read_skip_spaces PARAMS ((FILE *));
1796 extern rtx read_rtx PARAMS ((FILE *));
1799 extern const char *read_rtx_filename;
1800 extern int read_rtx_lineno;
1802 /* Redefine abort to report an internal error w/o coredump, and
1803 reporting the location of the error in the source file. This logic
1804 is duplicated in rtl.h and tree.h because every file that needs the
1805 special abort includes one or both. toplev.h gets too few files,
1806 system.h gets too many. */
1808 extern void fancy_abort PARAMS ((const char *, int, const char *))
1810 #if (GCC_VERSION >= 2007)
1811 #define abort() fancy_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
1813 #define abort() fancy_abort (__FILE__, __LINE__, 0)
1817 extern rtx canon_rtx PARAMS ((rtx));
1818 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
1820 extern int read_dependence PARAMS ((rtx, rtx));
1821 extern int anti_dependence PARAMS ((rtx, rtx));
1822 extern int output_dependence PARAMS ((rtx, rtx));
1823 extern void mark_constant_function PARAMS ((void));
1824 extern void init_alias_once PARAMS ((void));
1825 extern void init_alias_analysis PARAMS ((void));
1826 extern void end_alias_analysis PARAMS ((void));
1828 extern void record_base_value PARAMS ((int, rtx, int));
1829 extern void record_alias_subset PARAMS ((int, int));
1830 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
1834 sibcall_use_normal = 1,
1835 sibcall_use_tail_recursion,
1839 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
1840 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
1843 extern int stack_regs_mentioned PARAMS ((rtx insn));
1847 extern rtx stack_limit_rtx;
1849 /* In regrename.c */
1850 extern void regrename_optimize PARAMS ((void));
1853 extern void if_convert PARAMS ((int));