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 REG if value of this expression will never change during
120 the current function, even though it is not manifestly constant.
121 1 in a MEM if contents of memory are constant. This does not
122 necessarily mean that the value of this expression is constant.
123 1 in a SUBREG if it is from a promoted variable that is unsigned.
124 1 in a SYMBOL_REF if it addresses something in the per-function
126 1 in a CALL_INSN if it is a const call.
127 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
128 reorg until end of compilation; cleared before used. */
129 unsigned int unchanging : 1;
130 /* 1 in a MEM expression if contents of memory are volatile.
131 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
133 1 in a REG expression if corresponds to a variable declared by the user.
134 0 for an internally generated temporary.
135 In a SYMBOL_REF, this flag is used for machine-specific purposes.
136 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
137 unsigned int volatil : 1;
138 /* 1 in a MEM referring to a field of an aggregate.
139 0 if the MEM was a variable or the result of a * operator in C;
140 1 if it was the result of a . or -> operator (on a struct) in C.
141 1 in a REG if the register is used only in exit code a loop.
142 1 in a SUBREG expression if was generated from a variable with a
144 1 in a CODE_LABEL if the label is used for nonlocal gotos
145 and must not be deleted even if its count is zero.
146 1 in a LABEL_REF if this is a reference to a label outside the
148 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
149 together with the preceding insn. Valid only within sched.
150 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
151 from the target of a branch. Valid from reorg until end of compilation;
153 1 in an INSN if this insn is dead code. Valid only during
154 dead-code elimination phase; cleared before use. */
155 unsigned int in_struct : 1;
156 /* 1 if this rtx is used. This is used for copying shared structure.
157 See `unshare_all_rtl'.
158 In a REG, this is not needed for that purpose, and used instead
159 in `leaf_renumber_regs_insn'.
160 In a SYMBOL_REF, means that emit_library_call
161 has used it as the function. */
162 unsigned int used : 1;
163 /* Nonzero if this rtx came from procedure integration.
164 In a REG, nonzero means this reg refers to the return value
165 of the current function. */
166 unsigned integrated : 1;
167 /* 1 in an INSN or a SET if this rtx is related to the call frame,
168 either changing how we compute the frame address or saving and
169 restoring registers in the prologue and epilogue.
170 1 in a MEM if the MEM refers to a scalar, rather than a member of
172 unsigned frame_related : 1;
174 /* The first element of the operands of this rtx.
175 The number of operands and their types are controlled
176 by the `code' field, according to rtl.def. */
180 #define NULL_RTX (rtx) 0
182 /* Define macros to access the `code' field of the rtx. */
184 #define GET_CODE(RTX) ((RTX)->code)
185 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
187 #define GET_MODE(RTX) ((RTX)->mode)
188 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
190 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
191 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
192 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
194 /* RTL vector. These appear inside RTX's when there is a need
195 for a variable number of things. The principle use is inside
196 PARALLEL expressions. */
198 typedef struct rtvec_def{
199 int num_elem; /* number of elements */
200 struct rtx_def *elem[1];
203 #define NULL_RTVEC (rtvec) 0
205 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
206 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
208 /* Predicate yielding nonzero iff X is an rtl for a register. */
209 #define REG_P(X) (GET_CODE (X) == REG)
211 /* Predicate yielding nonzero iff X is a label insn. */
212 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
214 /* Predicate yielding nonzero iff X is a jump insn. */
215 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
217 /* Predicate yielding nonzero iff X is a note insn. */
218 #define NOTE_P(X) (GET_CODE (X) == NOTE)
220 /* Predicate yielding nonzero iff X is a barrier insn. */
221 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
223 /* Predicate yielding nonzero iff X is a data for a jump table. */
224 #define JUMP_TABLE_DATA_P(INSN) \
225 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
226 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
228 /* 1 if X is a constant value that is an integer. */
230 #define CONSTANT_P(X) \
231 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
232 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
233 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
234 || GET_CODE (X) == CONSTANT_P_RTX)
236 /* General accessor macros for accessing the fields of an rtx. */
238 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
239 /* The bit with a star outside the statement expr and an & inside is
240 so that N can be evaluated only once. */
241 #define RTL_CHECK1(RTX, N, C1) __extension__ \
242 (*({ rtx _rtx = (RTX); int _n = (N); \
243 enum rtx_code _code = GET_CODE (_rtx); \
244 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
245 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
246 if (GET_RTX_FORMAT(_code)[_n] != C1) \
247 rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
250 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
251 (*({ rtx _rtx = (RTX); int _n = (N); \
252 enum rtx_code _code = GET_CODE (_rtx); \
253 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
254 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
255 if (GET_RTX_FORMAT(_code)[_n] != C1 \
256 && GET_RTX_FORMAT(_code)[_n] != C2) \
257 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
261 #define RTL_CHECKC1(RTX, N, C) __extension__ \
262 (*({ rtx _rtx = (RTX); int _n = (N); \
263 if (GET_CODE (_rtx) != C) \
264 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
267 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
268 (*({ rtx _rtx = (RTX); int _n = (N); \
269 enum rtx_code _code = GET_CODE (_rtx); \
270 if (_code != C1 && _code != C2) \
271 rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
274 #define RTVEC_ELT(RTVEC, I) __extension__ \
275 (*({ rtvec _rtvec = (RTVEC); int _i = (I); \
276 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
277 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
279 &_rtvec->elem[_i]; }))
281 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
282 const char *, int, const char *))
284 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
285 const char *, int, const char *))
287 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
288 const char *, int, const char *))
290 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
291 const char *, int, const char *))
293 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
294 const char *, int, const char *))
296 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
297 const char *, int, const char *))
300 #else /* not ENABLE_RTL_CHECKING */
302 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
303 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
304 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
305 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
306 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
310 #define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
311 #define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
312 #define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
313 #define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
314 #define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
315 #define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
316 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
317 #define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
318 #define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
320 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
321 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
323 /* These are like XWINT, etc. except that they expect a '0' field instead
324 of the normal type code. */
326 #define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
327 #define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
328 #define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
329 #define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
330 #define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
331 #define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
332 #define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
333 #define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
334 #define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
335 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
336 #define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
338 #define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
339 #define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
340 #define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
341 #define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
342 #define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
343 #define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
344 #define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
345 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
346 #define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
347 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
348 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
349 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
351 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
352 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
354 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
356 /* ACCESS MACROS for particular fields of insns. */
358 /* Determines whether X is an insn. */
359 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
361 /* Holds a unique number for each insn.
362 These are not necessarily sequentially increasing. */
363 #define INSN_UID(INSN) XINT(INSN, 0)
365 /* Chain insns together in sequence. */
366 #define PREV_INSN(INSN) XEXP(INSN, 1)
367 #define NEXT_INSN(INSN) XEXP(INSN, 2)
369 /* The body of an insn. */
370 #define PATTERN(INSN) XEXP(INSN, 3)
372 /* Code number of instruction, from when it was recognized.
373 -1 means this instruction has not been recognized yet. */
374 #define INSN_CODE(INSN) XINT(INSN, 4)
376 /* Set up in flow.c; empty before then.
377 Holds a chain of INSN_LIST rtx's whose first operands point at
378 previous insns with direct data-flow connections to this one.
379 That means that those insns set variables whose next use is in this insn.
380 They are always in the same basic block as this insn. */
381 #define LOG_LINKS(INSN) XEXP(INSN, 5)
383 /* 1 if insn has been deleted. */
384 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
386 /* 1 if insn is a call to a const function. */
387 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
389 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
390 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
392 /* 1 if insn is a branch that should not unconditionally execute its
393 delay slots, i.e., it is an annulled branch. */
394 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
396 /* 1 if insn is a dead code. Valid only for dead-code elimination phase. */
397 #define INSN_DEAD_CODE_P(INSN) ((INSN)->in_struct)
399 /* 1 if insn is in a delay slot and is from the target of the branch. If
400 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
401 executed if the branch is taken. For annulled branches with this bit
402 clear, the insn should be executed only if the branch is not taken. */
403 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
405 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
407 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
409 /* Holds a list of notes on what this insn does to various REGs.
410 It is a chain of EXPR_LIST rtx's, where the second operand is the
411 chain pointer and the first operand is the REG being described.
412 The mode field of the EXPR_LIST contains not a real machine mode
413 but a value from enum reg_note. */
415 #define REG_NOTES(INSN) XEXP(INSN, 6)
417 /* Don't forget to change reg_note_name in rtl.c. */
420 /* The value in REG dies in this insn (i.e., it is not needed past
421 this insn). If REG is set in this insn, the REG_DEAD note may,
422 but need not, be omitted. */
425 /* The REG is autoincremented or autodecremented. */
428 /* Describes the insn as a whole; it says that the insn sets a register
429 to a constant value or to be equivalent to a memory address. If the
430 register is spilled to the stack then the constant value should be
431 substituted for it. The contents of the REG_EQUIV is the constant
432 value or memory address, which may be different from the source of
433 the SET although it has the same value. A REG_EQUIV note may also
434 appear on an insn which copies a register parameter to a pseudo-register,
435 if there is a memory address which could be used to hold that
436 pseudo-register throughout the function. */
439 /* Like REG_EQUIV except that the destination is only momentarily equal
440 to the specified rtx. Therefore, it cannot be used for substitution;
441 but it can be used for cse. */
444 /* The register set in this insn held 0 before the insn. The contents of
445 the note is the insn that stored the 0. If that insn is deleted or
446 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
447 is actually an INSN_LIST, not an EXPR_LIST. */
450 /* This insn copies the return-value of a library call out of the hard reg
451 for return values. This note is actually an INSN_LIST and it points to
452 the first insn involved in setting up arguments for the call. flow.c
453 uses this to delete the entire library call when its result is dead. */
456 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
457 and points at the one that has the REG_RETVAL. This note is also an
461 /* The register is always nonnegative during the containing loop. This is
462 used in branches so that decrement and branch instructions terminating
463 on zero can be matched. There must be an insn pattern in the md file
464 named `decrement_and_branch_until_zero' or else this will never be added
465 to any instructions. */
468 /* There is no conflict *after this insn* between the register in the note
469 and the destination of this insn. */
472 /* Identifies a register set in this insn and never used. */
475 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
476 respectively. Normally, these are required to be consecutive insns, but
477 we permit putting a cc0-setting insn in the delay slot of a branch as
478 long as only one copy of the insn exists. In that case, these notes
479 point from one to the other to allow code generation to determine what
480 any require information and to properly update CC_STATUS. These notes
482 REG_CC_SETTER, REG_CC_USER,
484 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
485 CODE_LABEL contained in the REG_LABEL note is used by the insn.
486 This note is an INSN_LIST. */
489 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
490 write-after-read and write-after-write dependencies respectively.
491 Data dependencies, which are the only type of LOG_LINK created by
492 flow, are represented by a 0 reg note kind. */
493 REG_DEP_ANTI, REG_DEP_OUTPUT,
495 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
496 -fbranch-probabilities is given. It has an integer value. For jumps,
497 it is the probability that this is a taken branch. For calls, it is
498 the probability that this call won't return. */
501 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
502 the first insn after each CALL_INSN. It indicates how many times this
503 block was executed. */
506 /* Attached to a call insn; indicates that the call is malloc-like and
507 that the pointer returned cannot alias anything else. */
510 /* Used to optimize rtl generated by dynamic stack allocations for targets
511 where SETJMP_VIA_SAVE_AREA is true. */
514 /* Attached to JUMP_INSNs only, it holds the branch prediction flags
515 computed by get_jump_flags() after dbr scheduling is complete. */
518 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
519 for DWARF to interpret what they imply. The attached rtx is used
520 instead of intuition. */
521 REG_FRAME_RELATED_EXPR,
523 /* Indicates that REG holds the exception context for the function.
524 This context is shared by inline functions, so the code to acquire
525 the real exception context is delayed until after inlining. */
528 /* Indicates what exception region an INSN belongs in. This is used to
529 indicate what region to which a call may throw. REGION 0 indicates
530 that a call cannot throw at all. REGION -1 indicates that it cannot
531 throw, nor will it execute a non-local goto. */
534 /* Indicates that a call is actually a call to rethrow, and specifies the
535 rethrow symbol for the region the rethrow is targetting. This provides
536 a way to generate the non standard flow edges required for a rethrow. */
539 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
542 /* Indicates that this insn (which is part of the prologue) computes
543 a value which might not be used later, and if so it's OK to delete
544 the insn. Normally, deleting any insn in the prologue is an error.
545 At present the parameter is unused and set to (const_int 0). */
548 /* Indicates that a call does not return. */
552 /* The base value for branch probability notes. */
553 #define REG_BR_PROB_BASE 10000
555 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
556 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
557 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
559 /* Names for REG_NOTE's in EXPR_LIST insn's. */
561 extern const char * const reg_note_name[];
562 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
564 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
565 USE and CLOBBER expressions.
566 USE expressions list the registers filled with arguments that
567 are passed to the function.
568 CLOBBER expressions document the registers explicitly clobbered
570 Pseudo registers can not be mentioned in this list. */
571 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
573 /* The label-number of a code-label. The assembler label
574 is made from `L' and the label-number printed in decimal.
575 Label numbers are unique in a compilation. */
576 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
578 #define LINE_NUMBER NOTE
580 /* In a NOTE that is a line number, this is a string for the file name that the
581 line is in. We use the same field to record block numbers temporarily in
582 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
583 between ints and pointers if we use a different macro for the block number.)
584 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
585 information as a rtx in the field. */
587 #define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
588 #define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
589 #define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
590 #define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
591 #define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
592 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
593 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
595 /* In a NOTE that is a line number, this is the line number.
596 Other kinds of NOTEs are identified by negative numbers here. */
597 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
599 /* Nonzero if INSN is a note marking the beginning of a basic block. */
600 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
601 (GET_CODE (INSN) == NOTE \
602 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
604 /* Codes that appear in the NOTE_LINE_NUMBER field
605 for kinds of notes that are not line numbers.
607 Notice that we do not try to use zero here for any of
608 the special note codes because sometimes the source line
609 actually can be zero! This happens (for example) when we
610 are generating code for the per-translation-unit constructor
611 and destructor routines for some C++ translation unit.
613 If you should change any of the following values, or if you
614 should add a new value here, don't forget to change the
615 note_insn_name array in rtl.c. */
619 /* Keep all of these numbers negative. Adjust as needed. */
620 NOTE_INSN_BIAS = -100,
622 /* This note is used to get rid of an insn
623 when it isn't safe to patch the insn out of the chain. */
626 /* These are used to mark the beginning and end of a lexical block.
627 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
631 /* These mark the extremes of a loop. */
635 /* Generated at the place in a loop that `continue' jumps to. */
637 /* Generated at the start of a duplicated exit test. */
640 /* This kind of note is generated at the end of the function body,
641 just before the return insn or return label. In an optimizing
642 compilation it is deleted by the first jump optimization, after
643 enabling that optimizer to determine whether control can fall
644 off the end of the function body without a return statement. */
645 NOTE_INSN_FUNCTION_END,
647 /* This kind of note is generated just after each call to `setjmp',
648 and similar functions that can return twice. */
651 /* This marks the point immediately after the last prologue insn. */
652 NOTE_INSN_PROLOGUE_END,
654 /* This marks the point immediately prior to the first epilogue insn. */
655 NOTE_INSN_EPILOGUE_BEG,
657 /* Generated in place of user-declared labels when they are deleted. */
658 NOTE_INSN_DELETED_LABEL,
660 /* This note indicates the start of the real body of the function,
661 i.e. the point just after all of the parms have been moved into
663 NOTE_INSN_FUNCTION_BEG,
665 /* These note where exception handling regions begin and end.
666 Uses NOTE_EH_HANDLER to identify the region in question. */
667 NOTE_INSN_EH_REGION_BEG,
668 NOTE_INSN_EH_REGION_END,
670 /* Generated whenever a duplicate line number note is output. For example,
671 one is output after the end of an inline function, in order to prevent
672 the line containing the inline call from being counted twice in gcov. */
673 NOTE_INSN_REPEATED_LINE_NUMBER,
675 /* Start/end of a live range region, where pseudos allocated on the stack
676 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
680 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
683 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
684 NOTE_INSN_BASIC_BLOCK,
686 /* Record the expected value of a register at a location. Uses
687 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
688 NOTE_INSN_EXPECTED_VALUE,
693 /* Names for NOTE insn's other than line numbers. */
695 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
696 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
697 (note_insn_name[(NOTE_CODE) - NOTE_INSN_BIAS])
699 /* The name of a label, in case it corresponds to an explicit label
700 in the input source code. */
701 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
703 /* In jump.c, each label contains a count of the number
704 of LABEL_REFs that point at it, so unused labels can be deleted. */
705 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
707 /* Associate a name with a CODE_LABEL. */
708 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
710 /* The original regno this ADDRESSOF was built for. */
711 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
713 /* The variable in the register we took the address of. */
714 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
716 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
717 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
718 be decremented and possibly the label can be deleted. */
719 #define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
721 /* Once basic blocks are found in flow.c,
722 each CODE_LABEL starts a chain that goes through
723 all the LABEL_REFs that jump to that label.
724 The chain eventually winds up at the CODE_LABEL: it is circular. */
725 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
727 /* This is the field in the LABEL_REF through which the circular chain
728 of references to a particular label is linked.
729 This chain is set up in flow.c. */
731 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
733 /* Once basic blocks are found in flow.c,
734 Each LABEL_REF points to its containing instruction with this field. */
736 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
738 /* For a REG rtx, REGNO extracts the register number. */
740 #define REGNO(RTX) XCUINT(RTX, 0, REG)
742 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
743 is the current function's return value. */
745 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
747 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
748 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
750 /* 1 if the given register REG corresponds to a hard register. */
751 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
753 /* 1 if the given register number REG_NO corresponds to a hard register. */
754 #define HARD_REGISTER_NUM_P(REG_NO) (REG_NO < FIRST_PSEUDO_REGISTER)
756 /* For a CONST_INT rtx, INTVAL extracts the integer. */
758 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
760 /* For a CONST_DOUBLE:
761 The usual two ints that hold the value.
762 For a DImode, that is all there are;
763 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
764 For a float, the number of ints varies,
765 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
766 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
767 #define CONST_DOUBLE_LOW(r) XCWINT (r, 2, CONST_DOUBLE)
768 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 3, CONST_DOUBLE)
770 /* Link for chain of all CONST_DOUBLEs in use in current function. */
771 #define CONST_DOUBLE_CHAIN(r) XCEXP (r, 1, CONST_DOUBLE)
772 /* The MEM which represents this CONST_DOUBLE's value in memory,
773 or const0_rtx if no MEM has been made for it yet,
774 or cc0_rtx if it is not on the chain. */
775 #define CONST_DOUBLE_MEM(r) XCEXP (r, 0, CONST_DOUBLE)
777 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
778 SUBREG_WORD extracts the word-number. */
780 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
781 #define SUBREG_WORD(RTX) XCUINT(RTX, 1, SUBREG)
783 /* 1 if the REG contained in SUBREG_REG is already known to be
784 sign- or zero-extended from the mode of the SUBREG to the mode of
785 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
788 When used as a LHS, is means that this extension must be done
789 when assigning to SUBREG_REG. */
791 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
792 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
794 /* Access various components of an ASM_OPERANDS rtx. */
796 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
797 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
798 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
799 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
800 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
801 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
802 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
803 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
804 XCVECEXP ((RTX), 4, (N), ASM_OPERANDS)
805 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
806 XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
807 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
808 GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
809 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
810 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
812 /* For a MEM rtx, 1 if it's a volatile reference.
813 Also in an ASM_OPERANDS rtx. */
814 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
816 /* For a MEM rtx, 1 if it refers to an aggregate, either to the
817 aggregate itself of to a field of the aggregate. If zero, RTX may
818 or may not be such a reference. */
819 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
821 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
822 not refer to a scalar.*/
823 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
825 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
826 RTX. Otherwise, vice versa. Use this macro only when you are
827 *sure* that you know that the MEM is in a structure, or is a
828 scalar. VAL is evaluated only once. */
829 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
832 MEM_IN_STRUCT_P (RTX) = 1; \
833 MEM_SCALAR_P (RTX) = 0; \
837 MEM_IN_STRUCT_P (RTX) = 0; \
838 MEM_SCALAR_P (RTX) = 1; \
842 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
843 set, and may alias anything. Otherwise, the MEM can only alias
844 MEMs in the same alias set. This value is set in a
845 language-dependent manner in the front-end, and should not be
846 altered in the back-end. These set numbers are tested for zero,
847 and compared for equality; they have no other significance. In
848 some front-ends, these numbers may correspond in some way to types,
849 or other language-level entities, but they need not, and the
850 back-end makes no such assumptions. */
851 #define MEM_ALIAS_SET(RTX) XCWINT(RTX, 1, MEM)
853 /* Copy the attributes that apply to memory locations from RHS to LHS. */
854 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
855 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
856 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
857 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
858 MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS), \
859 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
861 /* For a LABEL_REF, 1 means that this reference is to a label outside the
862 loop containing the reference. */
863 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
865 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
866 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
867 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
869 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
870 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
872 /* For a REG, 1 means the register is used only in an exit test of a loop. */
873 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
875 /* During sched, for an insn, 1 means that the insn must be scheduled together
876 with the preceding insn. */
877 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
879 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
880 cost of the dependence link. The cost of executing an instruction
881 may vary based on how the results are used. LINK_COST_ZERO is 1 when
882 the cost through the link varies and is unchanged (i.e., the link has
883 zero additional cost). LINK_COST_FREE is 1 when the cost through the
884 link is zero (i.e., the link makes the cost free). In other cases,
885 the adjustment to the cost is recomputed each time it is needed. */
886 #define LINK_COST_ZERO(X) ((X)->jump)
887 #define LINK_COST_FREE(X) ((X)->call)
889 /* For a SET rtx, SET_DEST is the place that is set
890 and SET_SRC is the value it is set to. */
891 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
892 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
894 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
895 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
896 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
898 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
899 conditionally executing the code on, COND_EXEC_CODE is the code
900 to execute if the condition is true. */
901 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
902 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
904 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
905 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
907 /* Flag in a SYMBOL_REF for machine-specific purposes. */
908 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
910 /* 1 in a SYMBOL_REF if it represents a symbol which might have to change
911 if its inlined or unrolled. */
912 #define SYMBOL_REF_NEED_ADJUST(RTX) ((RTX)->in_struct)
914 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
915 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
917 /* Define a macro to look for REG_INC notes,
918 but save time on machines where they never exist. */
920 /* Don't continue this line--convex cc version 4.1 would lose. */
921 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
922 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
924 #define FIND_REG_INC_NOTE(insn, reg) 0
927 /* Indicate whether the machine has any sort of auto increment addressing.
928 If not, we can avoid checking for REG_INC notes. */
930 /* Don't continue this line--convex cc version 4.1 would lose. */
931 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
935 #ifndef HAVE_PRE_INCREMENT
936 #define HAVE_PRE_INCREMENT 0
939 #ifndef HAVE_PRE_DECREMENT
940 #define HAVE_PRE_DECREMENT 0
943 #ifndef HAVE_POST_INCREMENT
944 #define HAVE_POST_INCREMENT 0
947 #ifndef HAVE_POST_DECREMENT
948 #define HAVE_POST_DECREMENT 0
951 #ifndef HAVE_POST_MODIFY_DISP
952 #define HAVE_POST_MODIFY_DISP 0
955 #ifndef HAVE_POST_MODIFY_REG
956 #define HAVE_POST_MODIFY_REG 0
959 #ifndef HAVE_PRE_MODIFY_DISP
960 #define HAVE_PRE_MODIFY_DISP 0
963 #ifndef HAVE_PRE_MODIFY_REG
964 #define HAVE_PRE_MODIFY_REG 0
968 /* Some architectures do not have complete pre/post increment/decrement
969 instruction sets, or only move some modes efficiently. These macros
970 allow us to tune autoincrement generation. */
972 #ifndef USE_LOAD_POST_INCREMENT
973 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
976 #ifndef USE_LOAD_POST_DECREMENT
977 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
980 #ifndef USE_LOAD_PRE_INCREMENT
981 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
984 #ifndef USE_LOAD_PRE_DECREMENT
985 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
988 #ifndef USE_STORE_POST_INCREMENT
989 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
992 #ifndef USE_STORE_POST_DECREMENT
993 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
996 #ifndef USE_STORE_PRE_INCREMENT
997 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1000 #ifndef USE_STORE_PRE_DECREMENT
1001 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1005 /* Accessors for RANGE_INFO. */
1006 /* For RANGE_{START,END} notes return the RANGE_START note. */
1007 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
1009 /* For RANGE_{START,END} notes return the RANGE_START note. */
1010 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
1012 /* For RANGE_{START,END} notes, return the vector containing the registers used
1014 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1015 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1016 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
1018 /* For RANGE_{START,END} notes, the number of calls within the range. */
1019 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
1021 /* For RANGE_{START,END} notes, the number of insns within the range. */
1022 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
1024 /* For RANGE_{START,END} notes, a unique # to identify this range. */
1025 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
1027 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
1028 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
1030 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
1031 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
1033 /* For RANGE_{START,END} notes, the loop depth the range is in. */
1034 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
1036 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
1038 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
1040 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
1042 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
1044 /* For RANGE_START notes, the marker # of the start of the range. */
1045 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
1047 /* For RANGE_START notes, the marker # of the end of the range. */
1048 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
1050 /* Original pseudo register # for a live range note. */
1051 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
1053 /* Pseudo register # original register is copied into or -1. */
1054 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
1056 /* How many times a register in a live range note was referenced. */
1057 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
1059 /* How many times a register in a live range note was set. */
1060 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
1062 /* How many times a register in a live range note died. */
1063 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
1065 /* Whether the original value is needed to be copied into the range register at
1066 the start of the range. */
1067 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
1069 /* # of insns the register copy is live over. */
1070 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
1072 /* # of calls the register copy is live over. */
1073 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1075 /* DECL_NODE pointer of the declaration if the register is a user defined
1077 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1079 /* BLOCK_NODE pointer to the block the variable is declared in if the
1080 register is a user defined variable. */
1081 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1083 /* EXPR_LIST of the distinct ranges a variable is in. */
1084 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1086 /* Block a variable is declared in. */
1087 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1089 /* # of distinct ranges a variable is in. */
1090 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1092 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1093 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1095 /* For a NOTE_INSN_LIVE note, the original basic block number. */
1096 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1098 /* Determine if the insn is a PHI node. */
1099 #define PHI_NODE_P(X) \
1100 (X && GET_CODE (X) == INSN \
1101 && GET_CODE (PATTERN (X)) == SET \
1102 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1104 /* Nonzero if we need to distinguish between the return value of this function
1105 and the return value of a function called by this function. This helps
1107 This is 1 until after the rtl generation pass. */
1108 extern int rtx_equal_function_value_matters;
1110 /* Nonzero when we are generating CONCATs. */
1111 extern int generating_concat_p;
1113 /* Generally useful functions. */
1115 /* The following functions accept a wide integer argument. Rather than
1116 having to cast on every function call, we use a macro instead, that is
1117 defined here and in tree.h. */
1120 #define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N))
1121 #define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N))
1123 extern int exact_log2_wide PARAMS ((unsigned HOST_WIDE_INT));
1124 extern int floor_log2_wide PARAMS ((unsigned HOST_WIDE_INT));
1127 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1129 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1131 #define plus_constant_for_output(X,C) \
1132 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
1135 extern void set_stack_check_libfunc PARAMS ((rtx));
1136 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1137 enum machine_mode));
1138 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1139 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1140 extern void optimize_save_area_alloca PARAMS ((rtx));
1143 extern rtx gen_rtx PARAMS ((enum rtx_code,
1144 enum machine_mode, ...));
1145 extern rtvec gen_rtvec PARAMS ((int, ...));
1147 /* In other files */
1148 extern char *oballoc PARAMS ((int));
1149 extern char *permalloc PARAMS ((int));
1150 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1151 extern rtvec rtvec_alloc PARAMS ((int));
1152 extern rtx copy_insn_1 PARAMS ((rtx));
1153 extern rtx copy_insn PARAMS ((rtx));
1156 extern rtx copy_rtx PARAMS ((rtx));
1159 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1162 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1163 extern rtx shallow_copy_rtx PARAMS ((rtx));
1164 extern int rtx_equal_p PARAMS ((rtx, rtx));
1167 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1168 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1169 extern rtx gen_label_rtx PARAMS ((void));
1170 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1171 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1174 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1177 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1178 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1179 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1180 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1181 enum machine_mode));
1184 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1185 enum machine_mode));
1186 extern int subreg_lowpart_p PARAMS ((rtx));
1187 extern rtx make_safe_from PARAMS ((rtx, rtx));
1188 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1189 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
1190 extern rtx get_insns PARAMS ((void));
1191 extern const char *get_insn_name PARAMS ((int));
1192 extern rtx get_last_insn PARAMS ((void));
1193 extern rtx get_last_insn_anywhere PARAMS ((void));
1194 extern void start_sequence PARAMS ((void));
1195 extern void push_to_sequence PARAMS ((rtx));
1196 extern void end_sequence PARAMS ((void));
1197 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1198 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1199 extern rtx gen_sequence PARAMS ((void));
1202 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1203 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1206 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
1209 extern rtx get_pool_constant PARAMS ((rtx));
1210 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1211 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1212 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1213 extern int get_pool_offset PARAMS ((rtx));
1214 extern rtx simplify_subtraction PARAMS ((rtx));
1217 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1218 HOST_WIDE_INT, int));
1219 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1220 HOST_WIDE_INT, int));
1221 extern rtx assign_temp PARAMS ((union tree_node *,
1224 extern rtx protect_from_queue PARAMS ((rtx, int));
1225 extern void emit_queue PARAMS ((void));
1226 extern rtx emit_move_insn PARAMS ((rtx, rtx));
1229 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1230 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1231 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1232 extern rtx emit_barrier_before PARAMS ((rtx));
1233 extern rtx emit_label_before PARAMS ((rtx, rtx));
1234 extern rtx emit_note_before PARAMS ((int, rtx));
1235 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1236 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1237 extern rtx emit_barrier_after PARAMS ((rtx));
1238 extern rtx emit_label_after PARAMS ((rtx, rtx));
1239 extern rtx emit_note_after PARAMS ((int, rtx));
1240 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1241 extern rtx emit_insn PARAMS ((rtx));
1242 extern rtx emit_insns PARAMS ((rtx));
1243 extern rtx emit_insns_before PARAMS ((rtx, rtx));
1244 extern rtx emit_insns_after PARAMS ((rtx, rtx));
1245 extern rtx emit_jump_insn PARAMS ((rtx));
1246 extern rtx emit_call_insn PARAMS ((rtx));
1247 extern rtx emit_label PARAMS ((rtx));
1248 extern rtx emit_barrier PARAMS ((void));
1249 extern rtx emit_line_note PARAMS ((const char *, int));
1250 extern rtx emit_note PARAMS ((const char *, int));
1251 extern rtx emit_line_note_force PARAMS ((const char *, int));
1252 extern rtx make_insn_raw PARAMS ((rtx));
1253 extern rtx previous_insn PARAMS ((rtx));
1254 extern rtx next_insn PARAMS ((rtx));
1255 extern rtx prev_nonnote_insn PARAMS ((rtx));
1256 extern rtx next_nonnote_insn PARAMS ((rtx));
1257 extern rtx prev_real_insn PARAMS ((rtx));
1258 extern rtx next_real_insn PARAMS ((rtx));
1259 extern rtx prev_active_insn PARAMS ((rtx));
1260 extern rtx next_active_insn PARAMS ((rtx));
1261 extern int active_insn_p PARAMS ((rtx));
1262 extern rtx prev_label PARAMS ((rtx));
1263 extern rtx next_label PARAMS ((rtx));
1264 extern rtx next_cc0_user PARAMS ((rtx));
1265 extern rtx prev_cc0_setter PARAMS ((rtx));
1268 extern rtx next_nondeleted_insn PARAMS ((rtx));
1269 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1270 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1271 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1272 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1273 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1276 extern rtx find_equiv_reg PARAMS ((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
1279 extern rtx squeeze_notes PARAMS ((rtx, rtx));
1280 extern rtx delete_insn PARAMS ((rtx));
1281 extern void delete_jump PARAMS ((rtx));
1282 extern void delete_barrier PARAMS ((rtx));
1283 extern rtx get_label_before PARAMS ((rtx));
1284 extern rtx get_label_after PARAMS ((rtx));
1285 extern rtx follow_jumps PARAMS ((rtx));
1288 extern rtx adj_offsettable_operand PARAMS ((rtx, int));
1291 extern rtx try_split PARAMS ((rtx, rtx, int));
1293 /* In unknown file */
1294 extern rtx split_insns PARAMS ((rtx, rtx));
1296 /* In simplify-rtx.c */
1297 extern rtx simplify_unary_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
1298 extern rtx simplify_binary_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, rtx));
1299 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
1300 extern rtx simplify_relational_operation PARAMS ((enum rtx_code, enum machine_mode, rtx, rtx));
1301 extern rtx simplify_gen_binary PARAMS ((enum rtx_code, enum machine_mode,
1303 extern rtx simplify_rtx PARAMS ((rtx));
1306 extern rtx gen_move_insn PARAMS ((rtx, rtx));
1308 extern rtx gen_jump PARAMS ((rtx));
1309 extern rtx gen_beq PARAMS ((rtx));
1310 extern rtx gen_bge PARAMS ((rtx));
1311 extern rtx gen_ble PARAMS ((rtx));
1314 extern rtx gen_mem_addressof PARAMS ((rtx, union tree_node *));
1317 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
1320 extern rtx expand_complex_abs PARAMS ((enum machine_mode, rtx, rtx,
1324 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1328 extern void set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1330 /* Functions in rtlanal.c */
1332 extern int rtx_unstable_p PARAMS ((rtx));
1333 extern int rtx_varies_p PARAMS ((rtx));
1334 extern int rtx_addr_varies_p PARAMS ((rtx));
1335 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1336 extern rtx get_related_value PARAMS ((rtx));
1337 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1338 extern int count_occurrences PARAMS ((rtx, rtx, int));
1339 extern int reg_referenced_p PARAMS ((rtx, rtx));
1340 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1341 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1342 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1343 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1344 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1345 extern int no_labels_between_p PARAMS ((rtx, rtx));
1346 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1347 extern int modified_in_p PARAMS ((rtx, rtx));
1348 extern int insn_dependent_p PARAMS ((rtx, rtx));
1349 extern int reg_set_p PARAMS ((rtx, rtx));
1350 extern rtx single_set PARAMS ((rtx));
1351 extern int multiple_sets PARAMS ((rtx));
1352 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1353 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1355 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1356 extern void note_stores PARAMS ((rtx,
1357 void (*) (rtx, rtx, void *),
1359 extern rtx reg_set_last PARAMS ((rtx, rtx));
1360 extern int dead_or_set_p PARAMS ((rtx, rtx));
1361 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1362 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1363 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1365 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1366 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1368 extern void remove_note PARAMS ((rtx, rtx));
1369 extern int side_effects_p PARAMS ((rtx));
1370 extern int volatile_refs_p PARAMS ((rtx));
1371 extern int volatile_insn_p PARAMS ((rtx));
1372 extern int may_trap_p PARAMS ((rtx));
1373 extern int inequality_comparisons_p PARAMS ((rtx));
1374 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1375 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1377 extern int computed_jump_p PARAMS ((rtx));
1378 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1379 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1380 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1381 extern int auto_inc_p PARAMS ((rtx));
1382 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1383 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1384 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1388 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1389 void init_EXPR_INSN_LIST_cache PARAMS ((void));
1390 void free_EXPR_LIST_list PARAMS ((rtx *));
1391 void free_INSN_LIST_list PARAMS ((rtx *));
1392 void free_EXPR_LIST_node PARAMS ((rtx));
1393 void free_INSN_LIST_node PARAMS ((rtx));
1394 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1395 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1396 void clear_log_links PARAMS ((rtx));
1400 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1401 Always at least 3, since the combiner could put that many togetherm
1402 and we want this to remain correct for all the remaining passes. */
1404 extern int max_parallel;
1406 /* Free up register info memory. */
1407 extern void free_reg_info PARAMS ((void));
1410 extern int asm_noperands PARAMS ((rtx));
1411 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1413 enum machine_mode *));
1415 extern enum reg_class reg_preferred_class PARAMS ((int));
1416 extern enum reg_class reg_alternate_class PARAMS ((int));
1418 extern rtx get_first_nonparm_insn PARAMS ((void));
1420 extern void split_all_insns PARAMS ((int));
1422 #define MAX_SAVED_CONST_INT 64
1423 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1425 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1426 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1427 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1428 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1429 extern rtx const_true_rtx;
1431 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1433 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1434 same as VOIDmode. */
1436 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1438 /* Likewise, for the constants 1 and 2. */
1440 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1441 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1443 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1444 is used to represent the frame pointer. This is because the
1445 hard frame pointer and the automatic variables are separated by an amount
1446 that cannot be determined until after register allocation. We can assume
1447 that in this case ELIMINABLE_REGS will be defined, one action of which
1448 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1449 #ifndef HARD_FRAME_POINTER_REGNUM
1450 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1453 /* Index labels for global_rtl. */
1454 enum global_rtl_index
1460 /* For register elimination to work properly these hard_frame_pointer_rtx,
1461 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1462 the same register. */
1463 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1464 GR_ARG_POINTER = GR_FRAME_POINTER,
1466 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1467 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1469 GR_HARD_FRAME_POINTER,
1471 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1472 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1473 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1478 GR_VIRTUAL_INCOMING_ARGS,
1479 GR_VIRTUAL_STACK_ARGS,
1480 GR_VIRTUAL_STACK_DYNAMIC,
1481 GR_VIRTUAL_OUTGOING_ARGS,
1487 /* Pointers to standard pieces of rtx are stored here. */
1488 extern rtx global_rtl[GR_MAX];
1490 /* Standard pieces of rtx, to be substituted directly into things. */
1491 #define pc_rtx (global_rtl[GR_PC])
1492 #define cc0_rtx (global_rtl[GR_CC0])
1494 /* All references to certain hard regs, except those created
1495 by allocating pseudo regs into them (when that's possible),
1496 go through these unique rtx objects. */
1497 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1498 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1499 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1500 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1502 extern rtx pic_offset_table_rtx;
1503 extern rtx struct_value_rtx;
1504 extern rtx struct_value_incoming_rtx;
1505 extern rtx static_chain_rtx;
1506 extern rtx static_chain_incoming_rtx;
1507 extern rtx return_address_pointer_rtx;
1509 /* Include the RTL generation functions. */
1515 /* There are some RTL codes that require special attention; the
1516 generation functions included above do the raw handling. If you
1517 add to this list, modify special_rtx in gengenrtl.c as well. You
1518 should also modify gen_rtx to use the special function. */
1520 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1521 HOST_WIDE_INT, HOST_WIDE_INT));
1522 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1523 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1524 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1526 /* We need the cast here to ensure that we get the same result both with
1527 and without prototypes. */
1528 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1530 /* Virtual registers are used during RTL generation to refer to locations into
1531 the stack frame when the actual location isn't known until RTL generation
1532 is complete. The routine instantiate_virtual_regs replaces these with
1533 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1536 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1538 /* This points to the first word of the incoming arguments passed on the stack,
1539 either by the caller or by the callee when pretending it was passed by the
1542 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1544 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1546 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1547 variable on the stack. Otherwise, it points to the first variable on
1550 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1552 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1554 /* This points to the location of dynamically-allocated memory on the stack
1555 immediately after the stack pointer has been adjusted by the amount
1558 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1560 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1562 /* This points to the location in the stack at which outgoing arguments should
1563 be written when the stack is pre-pushed (arguments pushed using push
1564 insns always use sp). */
1566 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1568 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1570 /* This points to the Canonical Frame Address of the function. This
1571 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1572 but is calculated relative to the arg pointer for simplicity; the
1573 frame pointer nor stack pointer are necessarily fixed relative to
1574 the CFA until after reload. */
1576 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1578 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1580 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1582 extern rtx find_next_ref PARAMS ((rtx, rtx));
1583 extern rtx *find_single_use PARAMS ((rtx, rtx, rtx *));
1585 extern rtx output_constant_def PARAMS ((union tree_node *));
1586 extern rtx immed_real_const PARAMS ((union tree_node *));
1587 extern union tree_node *make_tree PARAMS ((union tree_node *, rtx));
1589 /* Define a default value for STORE_FLAG_VALUE. */
1591 #ifndef STORE_FLAG_VALUE
1592 #define STORE_FLAG_VALUE 1
1595 /* Nonzero after the second flow pass has completed.
1596 Set to 1 or 0 by toplev.c */
1597 extern int flow2_completed;
1599 /* Nonzero after end of reload pass.
1600 Set to 1 or 0 by reload1.c. */
1602 extern int reload_completed;
1604 /* Set to 1 while reload_as_needed is operating.
1605 Required by some machines to handle any generated moves differently. */
1607 extern int reload_in_progress;
1609 /* If this is nonzero, we do not bother generating VOLATILE
1610 around volatile memory references, and we are willing to
1611 output indirect addresses. If cse is to follow, we reject
1612 indirect addresses so a useful potential cse is generated;
1613 if it is used only once, instruction combination will produce
1614 the same indirect address eventually. */
1615 extern int cse_not_expected;
1617 /* Set to nonzero before life analysis to indicate that it is unsafe to
1618 generate any new pseudo registers. */
1619 extern int no_new_pseudos;
1621 /* Translates rtx code to tree code, for those codes needed by
1622 REAL_ARITHMETIC. The function returns an int because the caller may not
1623 know what `enum tree_code' means. */
1625 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1628 extern void obfree PARAMS ((char *));
1630 extern void gcc_obstack_init PARAMS ((struct obstack *));
1631 extern void pop_obstacks PARAMS ((void));
1632 extern void push_obstacks PARAMS ((struct obstack *,
1635 struct cse_basic_block_data;
1636 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1637 extern int address_cost PARAMS ((rtx, enum machine_mode));
1638 extern void delete_trivially_dead_insns PARAMS ((rtx, int));
1640 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1642 extern void cse_end_of_basic_block PARAMS ((rtx,
1643 struct cse_basic_block_data *,
1647 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1648 extern int condjump_p PARAMS ((rtx));
1649 extern int any_condjump_p PARAMS ((rtx));
1650 extern int any_uncondjump_p PARAMS ((rtx));
1651 extern int safe_to_remove_jump_p PARAMS ((rtx));
1652 extern rtx pc_set PARAMS ((rtx));
1653 extern rtx condjump_label PARAMS ((rtx));
1654 extern int simplejump_p PARAMS ((rtx));
1655 extern int returnjump_p PARAMS ((rtx));
1656 extern int onlyjump_p PARAMS ((rtx));
1657 extern int sets_cc0_p PARAMS ((rtx));
1658 extern int invert_jump_1 PARAMS ((rtx, rtx));
1659 extern int invert_jump PARAMS ((rtx, rtx, int));
1660 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1661 extern int true_regnum PARAMS ((rtx));
1662 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1663 extern int redirect_jump PARAMS ((rtx, rtx, int));
1664 extern void jump_optimize PARAMS ((rtx, int, int, int));
1665 extern void jump_optimize_minimal PARAMS ((rtx));
1666 extern void rebuild_jump_labels PARAMS ((rtx));
1667 extern void thread_jumps PARAMS ((rtx, int, int));
1668 extern int rtx_equal_for_thread_p PARAMS ((rtx, rtx, rtx));
1669 extern int can_reverse_comparison_p PARAMS ((rtx, rtx));
1670 extern void delete_for_peephole PARAMS ((rtx, rtx));
1671 extern int condjump_in_parallel_p PARAMS ((rtx));
1672 extern void never_reached_warning PARAMS ((rtx));
1674 /* Flags for jump_optimize() */
1675 #define JUMP_CROSS_JUMP 1
1676 #define JUMP_CROSS_JUMP_DEATH_MATTERS 2
1677 #define JUMP_NOOP_MOVES 1
1678 #define JUMP_AFTER_REGSCAN 1
1680 /* In emit-rtl.c. */
1681 extern int max_reg_num PARAMS ((void));
1682 extern int max_label_num PARAMS ((void));
1683 extern int get_first_label_num PARAMS ((void));
1684 extern void delete_insns_since PARAMS ((rtx));
1685 extern void mark_reg_pointer PARAMS ((rtx, int));
1686 extern void mark_user_reg PARAMS ((rtx));
1687 extern void reset_used_flags PARAMS ((rtx));
1688 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1689 extern int get_max_uid PARAMS ((void));
1690 extern int in_sequence_p PARAMS ((void));
1691 extern void force_next_line_note PARAMS ((void));
1692 extern void clear_emit_caches PARAMS ((void));
1693 extern void init_emit PARAMS ((void));
1694 extern void init_emit_once PARAMS ((int));
1695 extern void push_topmost_sequence PARAMS ((void));
1696 extern void pop_topmost_sequence PARAMS ((void));
1697 extern int subreg_realpart_p PARAMS ((rtx));
1698 extern void reverse_comparison PARAMS ((rtx));
1699 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1700 extern void set_new_first_and_last_label_num PARAMS ((int, int));
1701 extern void set_new_last_label_num PARAMS ((int));
1702 extern void unshare_all_rtl_again PARAMS ((rtx));
1703 extern void set_last_insn PARAMS ((rtx));
1704 extern void link_cc0_insns PARAMS ((rtx));
1705 extern void add_insn PARAMS ((rtx));
1706 extern void add_insn_before PARAMS ((rtx, rtx));
1707 extern void add_insn_after PARAMS ((rtx, rtx));
1708 extern void remove_insn PARAMS ((rtx));
1709 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1710 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1711 extern enum rtx_code classify_insn PARAMS ((rtx));
1712 extern rtx emit PARAMS ((rtx));
1713 /* Query and clear/ restore no_line_numbers. This is used by the
1714 switch / case handling in stmt.c to give proper line numbers in
1715 warnings about unreachable code. */
1716 int force_line_numbers PARAMS ((void));
1717 void restore_line_number_status PARAMS ((int old_value));
1718 extern void renumber_insns PARAMS ((FILE *));
1719 extern void remove_unnecessary_notes PARAMS ((void));
1721 /* In insn-emit.c */
1722 extern void add_clobbers PARAMS ((rtx, int));
1725 extern int combine_instructions PARAMS ((rtx, unsigned int));
1726 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
1727 extern rtx remove_death PARAMS ((unsigned int, rtx));
1729 extern void dump_combine_stats PARAMS ((FILE *));
1730 extern void dump_combine_total_stats PARAMS ((FILE *));
1735 extern void schedule_insns PARAMS ((FILE *));
1737 extern void fix_sched_param PARAMS ((const char *, const char *));
1739 /* In print-rtl.c */
1740 extern void debug_rtx PARAMS ((rtx));
1741 extern void debug_rtx_list PARAMS ((rtx, int));
1742 extern void debug_rtx_range PARAMS ((rtx, rtx));
1743 extern rtx debug_rtx_find PARAMS ((rtx, int));
1745 extern void print_rtl PARAMS ((FILE *, rtx));
1746 extern int print_rtl_single PARAMS ((FILE *, rtx));
1747 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
1751 extern void init_loop PARAMS ((void));
1752 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
1754 extern void loop_optimize PARAMS ((rtx, FILE *, int));
1756 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
1759 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
1760 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
1761 extern int prologue_epilogue_contains PARAMS ((rtx));
1762 extern int sibcall_epilogue_contains PARAMS ((rtx));
1763 extern HOST_WIDE_INT get_frame_size PARAMS ((void));
1764 extern void preserve_rtl_expr_result PARAMS ((rtx));
1765 extern void mark_temp_addr_taken PARAMS ((rtx));
1766 extern void update_temp_slot_address PARAMS ((rtx, rtx));
1767 extern void purge_addressof PARAMS ((rtx));
1770 extern int operands_match_p PARAMS ((rtx, rtx));
1771 extern int safe_from_earlyclobber PARAMS ((rtx, rtx));
1774 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
1775 extern void expand_null_return PARAMS ((void));
1776 extern void emit_jump PARAMS ((rtx));
1777 extern int preserve_subexpressions_p PARAMS ((void));
1780 extern void init_expr_once PARAMS ((void));
1781 extern void move_by_pieces PARAMS ((rtx, rtx,
1782 unsigned HOST_WIDE_INT,
1786 extern void allocate_bb_life_data PARAMS ((void));
1787 extern void allocate_reg_life_data PARAMS ((void));
1788 extern void recompute_reg_usage PARAMS ((rtx, int));
1790 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
1791 extern void dump_flow_info PARAMS ((FILE *));
1795 extern void init_expmed PARAMS ((void));
1796 extern void expand_inc PARAMS ((rtx, rtx));
1797 extern void expand_dec PARAMS ((rtx, rtx));
1798 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
1799 unsigned HOST_WIDE_INT, rtx,
1804 extern int gcse_main PARAMS ((rtx, FILE *));
1808 extern void mark_elimination PARAMS ((int, int));
1810 extern int global_alloc PARAMS ((FILE *));
1811 extern void dump_global_regs PARAMS ((FILE *));
1814 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
1816 extern void build_insn_chain PARAMS ((rtx));
1819 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
1820 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
1821 extern void globalize_reg PARAMS ((int));
1822 extern void init_regs PARAMS ((void));
1823 extern void init_reg_sets PARAMS ((void));
1824 extern void regset_release_memory PARAMS ((void));
1825 extern void regclass_init PARAMS ((void));
1826 extern void regclass PARAMS ((rtx, int, FILE *));
1827 extern void reg_scan PARAMS ((rtx, unsigned int, int));
1828 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
1829 extern void fix_register PARAMS ((const char *, int, int));
1831 extern void delete_null_pointer_checks PARAMS ((rtx));
1835 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
1837 extern void combine_stack_adjustments PARAMS ((void));
1841 extern void dbr_schedule PARAMS ((rtx, FILE *));
1845 extern void init_optabs PARAMS ((void));
1847 /* In local-alloc.c */
1849 extern void dump_local_alloc PARAMS ((FILE *));
1851 extern int local_alloc PARAMS ((void));
1852 extern int function_invariant_p PARAMS ((rtx));
1855 extern void reload_cse_regs PARAMS ((rtx));
1856 extern void init_reload PARAMS ((void));
1857 extern void mark_home_live PARAMS ((int));
1858 extern int reload PARAMS ((rtx, int));
1860 /* In caller-save.c */
1861 extern void init_caller_save PARAMS ((void));
1864 extern void init_branch_prob PARAMS ((const char *));
1865 extern void branch_prob PARAMS ((void));
1866 extern void end_branch_prob PARAMS ((void));
1867 extern void output_func_start_profiler PARAMS ((void));
1869 /* In reg-stack.c */
1871 extern void reg_to_stack PARAMS ((rtx, FILE *));
1874 /* In fold-const.c */
1875 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1876 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1877 unsigned HOST_WIDE_INT *,
1879 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1880 unsigned HOST_WIDE_INT *,
1882 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
1884 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1885 unsigned HOST_WIDE_INT *,
1887 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1888 HOST_WIDE_INT, unsigned int,
1889 unsigned HOST_WIDE_INT *,
1890 HOST_WIDE_INT *, int));
1891 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1892 HOST_WIDE_INT, unsigned int,
1893 unsigned HOST_WIDE_INT *,
1894 HOST_WIDE_INT *, int));
1895 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1896 HOST_WIDE_INT, unsigned int,
1897 unsigned HOST_WIDE_INT *,
1899 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1900 HOST_WIDE_INT, unsigned int,
1901 unsigned HOST_WIDE_INT *,
1905 extern void emit_library_call PARAMS ((rtx, int, enum machine_mode,
1907 extern rtx emit_library_call_value PARAMS ((rtx, rtx, int,
1912 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
1915 extern void bss_section PARAMS ((void));
1916 extern int in_data_section PARAMS ((void));
1917 extern int supports_one_only PARAMS ((void));
1918 extern void init_varasm_once PARAMS ((void));
1921 extern void init_rtl PARAMS ((void));
1922 extern void rtx_free PARAMS ((rtx));
1925 extern int read_skip_spaces PARAMS ((FILE *));
1926 extern rtx read_rtx PARAMS ((FILE *));
1929 extern const char *read_rtx_filename;
1930 extern int read_rtx_lineno;
1932 /* Redefine abort to report an internal error w/o coredump, and
1933 reporting the location of the error in the source file. This logic
1934 is duplicated in rtl.h and tree.h because every file that needs the
1935 special abort includes one or both. toplev.h gets too few files,
1936 system.h gets too many. */
1938 extern void fancy_abort PARAMS ((const char *, int, const char *))
1940 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
1943 extern rtx canon_rtx PARAMS ((rtx));
1944 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
1946 extern int read_dependence PARAMS ((rtx, rtx));
1947 extern int anti_dependence PARAMS ((rtx, rtx));
1948 extern int output_dependence PARAMS ((rtx, rtx));
1949 extern void mark_constant_function PARAMS ((void));
1950 extern void init_alias_once PARAMS ((void));
1951 extern void init_alias_analysis PARAMS ((void));
1952 extern void end_alias_analysis PARAMS ((void));
1953 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
1957 sibcall_use_normal = 1,
1958 sibcall_use_tail_recursion,
1962 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
1963 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
1966 extern int stack_regs_mentioned PARAMS ((rtx insn));
1970 extern rtx stack_limit_rtx;
1972 /* In regrename.c */
1973 extern void regrename_optimize PARAMS ((void));
1976 extern void if_convert PARAMS ((int));