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, 2001 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 /* Value used by some passes to "recognize" noop moves as valid instructions.
40 #define NOOP_MOVE_INSN_CODE INT_MAX
42 /* Register Transfer Language EXPRESSIONS CODES */
44 #define RTX_CODE enum rtx_code
47 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
48 #include "rtl.def" /* rtl expressions are documented here */
51 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
53 Assumes default enum value assignment. */
55 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
56 /* The cast here, saves many elsewhere. */
58 extern const int rtx_length[];
59 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
61 extern const char * const rtx_name[];
62 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
64 extern const char * const rtx_format[];
65 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
67 extern const char rtx_class[];
68 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
70 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
71 relative to which the offsets are calculated, as explained in rtl.def. */
74 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
75 unsigned min_align: 8;
77 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
78 unsigned min_after_vec: 1; /* minimum address target label is after the ADDR_DIFF_VEC. */
79 unsigned max_after_vec: 1; /* maximum address target label is after the ADDR_DIFF_VEC. */
80 unsigned min_after_base: 1; /* minimum address target label is after BASE. */
81 unsigned max_after_base: 1; /* maximum address target label is after BASE. */
82 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
83 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
86 } addr_diff_vec_flags;
88 /* Common union for an element of an rtx. */
90 typedef union rtunion_def
97 struct rtvec_def *rtvec;
98 enum machine_mode rttype;
99 addr_diff_vec_flags rt_addr_diff_vec_flags;
100 struct cselib_val_struct *rt_cselib;
101 struct bitmap_head_def *rtbit;
102 union tree_node *rttree;
103 struct basic_block_def *bb;
106 /* RTL expression ("rtx"). */
108 typedef struct rtx_def
110 /* The kind of expression this is. */
111 ENUM_BITFIELD(rtx_code) code: 16;
113 /* The kind of value the expression has. */
114 ENUM_BITFIELD(machine_mode) mode : 8;
116 /* 1 in an INSN if it can alter flow of control
117 within this function.
118 LINK_COST_ZERO in an INSN_LIST. */
119 unsigned int jump : 1;
120 /* 1 in an INSN if it can call another function.
121 LINK_COST_FREE in an INSN_LIST. */
122 unsigned int call : 1;
123 /* 1 in a REG if value of this expression will never change during
124 the current function, even though it is not manifestly constant.
125 1 in a MEM if contents of memory are constant. This does not
126 necessarily mean that the value of this expression is constant.
127 1 in a SUBREG if it is from a promoted variable that is unsigned.
128 1 in a SYMBOL_REF if it addresses something in the per-function
130 1 in a CALL_INSN if it is a const call.
131 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
132 reorg until end of compilation; cleared before used. */
133 unsigned int unchanging : 1;
134 /* 1 in a MEM expression if contents of memory are volatile.
135 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
137 1 in a REG expression if corresponds to a variable declared by the user.
138 0 for an internally generated temporary.
139 In a SYMBOL_REF, this flag is used for machine-specific purposes.
140 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
141 unsigned int volatil : 1;
142 /* 1 in a MEM referring to a field of an aggregate.
143 0 if the MEM was a variable or the result of a * operator in C;
144 1 if it was the result of a . or -> operator (on a struct) in C.
145 1 in a REG if the register is used only in exit code a loop.
146 1 in a SUBREG expression if was generated from a variable with a
148 1 in a CODE_LABEL if the label is used for nonlocal gotos
149 and must not be deleted even if its count is zero.
150 1 in a LABEL_REF if this is a reference to a label outside the
152 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
153 together with the preceding insn. Valid only within sched.
154 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
155 from the target of a branch. Valid from reorg until end of compilation;
157 1 in an INSN if this insn is dead code. Valid only during
158 dead-code elimination phase; cleared before use. */
159 unsigned int in_struct : 1;
160 /* 1 if this rtx is used. This is used for copying shared structure.
161 See `unshare_all_rtl'.
162 In a REG, this is not needed for that purpose, and used instead
163 in `leaf_renumber_regs_insn'.
164 In a SYMBOL_REF, means that emit_library_call
165 has used it as the function. */
166 unsigned int used : 1;
167 /* Nonzero if this rtx came from procedure integration.
168 In a REG, nonzero means this reg refers to the return value
169 of the current function.
170 1 in a SYMBOL_REF if the symbol is weak. */
171 unsigned integrated : 1;
172 /* 1 in an INSN or a SET if this rtx is related to the call frame,
173 either changing how we compute the frame address or saving and
174 restoring registers in the prologue and epilogue.
175 1 in a MEM if the MEM refers to a scalar, rather than a member of
177 1 in a REG if the register is a pointer.
178 1 in a SYMBOL_REF if it addresses something in the per-function
179 constant string pool. */
180 unsigned frame_related : 1;
182 /* The first element of the operands of this rtx.
183 The number of operands and their types are controlled
184 by the `code' field, according to rtl.def. */
188 #define NULL_RTX (rtx) 0
190 /* Define macros to access the `code' field of the rtx. */
192 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
193 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
195 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
196 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
198 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
199 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
200 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
202 /* RTL vector. These appear inside RTX's when there is a need
203 for a variable number of things. The principle use is inside
204 PARALLEL expressions. */
206 typedef struct rtvec_def{
207 int num_elem; /* number of elements */
208 struct rtx_def *elem[1];
211 #define NULL_RTVEC (rtvec) 0
213 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
214 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
216 /* Predicate yielding nonzero iff X is an rtl for a register. */
217 #define REG_P(X) (GET_CODE (X) == REG)
219 /* Predicate yielding nonzero iff X is a label insn. */
220 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
222 /* Predicate yielding nonzero iff X is a jump insn. */
223 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
225 /* Predicate yielding nonzero iff X is a note insn. */
226 #define NOTE_P(X) (GET_CODE (X) == NOTE)
228 /* Predicate yielding nonzero iff X is a barrier insn. */
229 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
231 /* Predicate yielding nonzero iff X is a data for a jump table. */
232 #define JUMP_TABLE_DATA_P(INSN) \
233 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
234 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
236 /* 1 if X is a constant value that is an integer. */
238 #define CONSTANT_P(X) \
239 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
240 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
241 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
242 || GET_CODE (X) == CONSTANT_P_RTX)
244 /* General accessor macros for accessing the fields of an rtx. */
246 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
247 /* The bit with a star outside the statement expr and an & inside is
248 so that N can be evaluated only once. */
249 #define RTL_CHECK1(RTX, N, C1) __extension__ \
250 (*({ rtx _rtx = (RTX); int _n = (N); \
251 enum rtx_code _code = GET_CODE (_rtx); \
252 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
253 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
254 if (GET_RTX_FORMAT(_code)[_n] != C1) \
255 rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
258 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
259 (*({ rtx _rtx = (RTX); int _n = (N); \
260 enum rtx_code _code = GET_CODE (_rtx); \
261 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
262 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
263 if (GET_RTX_FORMAT(_code)[_n] != C1 \
264 && GET_RTX_FORMAT(_code)[_n] != C2) \
265 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
269 #define RTL_CHECKC1(RTX, N, C) __extension__ \
270 (*({ rtx _rtx = (RTX); int _n = (N); \
271 if (GET_CODE (_rtx) != C) \
272 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
275 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
276 (*({ rtx _rtx = (RTX); int _n = (N); \
277 enum rtx_code _code = GET_CODE (_rtx); \
278 if (_code != C1 && _code != C2) \
279 rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
282 #define RTVEC_ELT(RTVEC, I) __extension__ \
283 (*({ rtvec _rtvec = (RTVEC); int _i = (I); \
284 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
285 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
287 &_rtvec->elem[_i]; }))
289 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
290 const char *, int, const char *))
292 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
293 const char *, int, const char *))
295 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
296 const char *, int, const char *))
298 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
299 const char *, int, const char *))
301 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
302 const char *, int, const char *))
304 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
305 const char *, int, const char *))
308 #else /* not ENABLE_RTL_CHECKING */
310 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
311 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
312 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
313 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
314 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
318 #define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
319 #define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
320 #define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
321 #define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
322 #define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
323 #define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
324 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
325 #define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
326 #define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
327 #define XTMPL(RTX, N) (RTL_CHECK1(RTX, N, 'T').rtstr)
329 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
330 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
332 /* These are like XWINT, etc. except that they expect a '0' field instead
333 of the normal type code. */
335 #define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
336 #define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
337 #define X0UINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtuint)
338 #define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
339 #define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
340 #define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
341 #define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
342 #define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
343 #define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
344 #define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
345 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
346 #define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
348 #define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
349 #define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
350 #define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
351 #define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
352 #define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
353 #define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
354 #define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
355 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
356 #define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
357 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
358 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
359 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
361 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
362 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
364 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
366 /* ACCESS MACROS for particular fields of insns. */
368 /* Determines whether X is an insn. */
369 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
371 /* Holds a unique number for each insn.
372 These are not necessarily sequentially increasing. */
373 #define INSN_UID(INSN) XINT(INSN, 0)
375 /* Chain insns together in sequence. */
376 #define PREV_INSN(INSN) XEXP(INSN, 1)
377 #define NEXT_INSN(INSN) XEXP(INSN, 2)
379 /* The body of an insn. */
380 #define PATTERN(INSN) XEXP(INSN, 3)
382 /* Code number of instruction, from when it was recognized.
383 -1 means this instruction has not been recognized yet. */
384 #define INSN_CODE(INSN) XINT(INSN, 4)
386 /* Set up in flow.c; empty before then.
387 Holds a chain of INSN_LIST rtx's whose first operands point at
388 previous insns with direct data-flow connections to this one.
389 That means that those insns set variables whose next use is in this insn.
390 They are always in the same basic block as this insn. */
391 #define LOG_LINKS(INSN) XEXP(INSN, 5)
393 /* 1 if insn has been deleted. */
394 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
396 /* 1 if insn is a call to a const or pure function. */
397 #define CONST_OR_PURE_CALL_P(INSN) ((INSN)->unchanging)
399 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
400 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
402 /* 1 if insn is a branch that should not unconditionally execute its
403 delay slots, i.e., it is an annulled branch. */
404 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
406 /* 1 if insn is a dead code. Valid only for dead-code elimination phase. */
407 #define INSN_DEAD_CODE_P(INSN) ((INSN)->in_struct)
409 /* 1 if insn is in a delay slot and is from the target of the branch. If
410 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
411 executed if the branch is taken. For annulled branches with this bit
412 clear, the insn should be executed only if the branch is not taken. */
413 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
415 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
417 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
419 /* Holds a list of notes on what this insn does to various REGs.
420 It is a chain of EXPR_LIST rtx's, where the second operand is the
421 chain pointer and the first operand is the REG being described.
422 The mode field of the EXPR_LIST contains not a real machine mode
423 but a value from enum reg_note. */
425 #define REG_NOTES(INSN) XEXP(INSN, 6)
427 /* Don't forget to change reg_note_name in rtl.c. */
430 /* The value in REG dies in this insn (i.e., it is not needed past
431 this insn). If REG is set in this insn, the REG_DEAD note may,
432 but need not, be omitted. */
435 /* The REG is autoincremented or autodecremented. */
438 /* Describes the insn as a whole; it says that the insn sets a register
439 to a constant value or to be equivalent to a memory address. If the
440 register is spilled to the stack then the constant value should be
441 substituted for it. The contents of the REG_EQUIV is the constant
442 value or memory address, which may be different from the source of
443 the SET although it has the same value. A REG_EQUIV note may also
444 appear on an insn which copies a register parameter to a pseudo-register,
445 if there is a memory address which could be used to hold that
446 pseudo-register throughout the function. */
449 /* Like REG_EQUIV except that the destination is only momentarily equal
450 to the specified rtx. Therefore, it cannot be used for substitution;
451 but it can be used for cse. */
454 /* The register set in this insn held 0 before the insn. The contents of
455 the note is the insn that stored the 0. If that insn is deleted or
456 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
457 is actually an INSN_LIST, not an EXPR_LIST. */
460 /* This insn copies the return-value of a library call out of the hard reg
461 for return values. This note is actually an INSN_LIST and it points to
462 the first insn involved in setting up arguments for the call. flow.c
463 uses this to delete the entire library call when its result is dead. */
466 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
467 and points at the one that has the REG_RETVAL. This note is also an
471 /* The register is always nonnegative during the containing loop. This is
472 used in branches so that decrement and branch instructions terminating
473 on zero can be matched. There must be an insn pattern in the md file
474 named `decrement_and_branch_until_zero' or else this will never be added
475 to any instructions. */
478 /* There is no conflict *after this insn* between the register in the note
479 and the destination of this insn. */
482 /* Identifies a register set in this insn and never used. */
485 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
486 respectively. Normally, these are required to be consecutive insns, but
487 we permit putting a cc0-setting insn in the delay slot of a branch as
488 long as only one copy of the insn exists. In that case, these notes
489 point from one to the other to allow code generation to determine what
490 any require information and to properly update CC_STATUS. These notes
492 REG_CC_SETTER, REG_CC_USER,
494 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
495 CODE_LABEL contained in the REG_LABEL note is used by the insn.
496 This note is an INSN_LIST. */
499 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
500 write-after-read and write-after-write dependencies respectively.
501 Data dependencies, which are the only type of LOG_LINK created by
502 flow, are represented by a 0 reg note kind. */
503 REG_DEP_ANTI, REG_DEP_OUTPUT,
505 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.
506 It has an integer value. For jumps, it is the probability that this is a
507 taken branch. For calls, it is the probability that this call won't
511 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
512 the first insn after each CALL_INSN. It indicates how many times this
513 block was executed. */
516 /* Attached to a call insn; indicates that the call is malloc-like and
517 that the pointer returned cannot alias anything else. */
520 /* Used to optimize rtl generated by dynamic stack allocations for targets
521 where SETJMP_VIA_SAVE_AREA is true. */
524 /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
525 CONCAT of two integer value. First specifies the branch predictor
526 that added the note, second specifies the predicted hitrate of branch
527 in the same format as REG_BR_PROB note uses. */
530 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
531 for DWARF to interpret what they imply. The attached rtx is used
532 instead of intuition. */
533 REG_FRAME_RELATED_EXPR,
535 /* Indicates that REG holds the exception context for the function.
536 This context is shared by inline functions, so the code to acquire
537 the real exception context is delayed until after inlining. */
540 /* Indicates what exception region an INSN belongs in. This is used to
541 indicate what region to which a call may throw. REGION 0 indicates
542 that a call cannot throw at all. REGION -1 indicates that it cannot
543 throw, nor will it execute a non-local goto. */
546 /* Indicates that a call is actually a call to rethrow, and specifies the
547 rethrow symbol for the region the rethrow is targetting. This provides
548 a way to generate the non standard flow edges required for a rethrow. */
551 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
554 /* Indicates that this insn (which is part of the prologue) computes
555 a value which might not be used later, and if so it's OK to delete
556 the insn. Normally, deleting any insn in the prologue is an error.
557 At present the parameter is unused and set to (const_int 0). */
560 /* Indicates that a call does not return. */
563 /* Indicates that an indirect jump is a non-local goto instead of a
567 /* This kind of note is generated at each to `setjmp',
568 and similar functions that can return twice. */
571 /* Indicate calls that always returns. */
575 /* The base value for branch probability notes. */
576 #define REG_BR_PROB_BASE 10000
578 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
579 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
580 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
582 /* Names for REG_NOTE's in EXPR_LIST insn's. */
584 extern const char * const reg_note_name[];
585 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
587 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
588 USE and CLOBBER expressions.
589 USE expressions list the registers filled with arguments that
590 are passed to the function.
591 CLOBBER expressions document the registers explicitly clobbered
593 Pseudo registers can not be mentioned in this list. */
594 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
596 /* The label-number of a code-label. The assembler label
597 is made from `L' and the label-number printed in decimal.
598 Label numbers are unique in a compilation. */
599 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
601 #define LINE_NUMBER NOTE
603 /* In a NOTE that is a line number, this is a string for the file name that the
604 line is in. We use the same field to record block numbers temporarily in
605 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
606 between ints and pointers if we use a different macro for the block number.)
607 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
608 information as a rtx in the field. */
610 #define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
611 #define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
612 #define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
613 #define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
614 #define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
615 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
616 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
618 /* In a NOTE that is a line number, this is the line number.
619 Other kinds of NOTEs are identified by negative numbers here. */
620 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
622 /* Nonzero if INSN is a note marking the beginning of a basic block. */
623 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
624 (GET_CODE (INSN) == NOTE \
625 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
627 /* Codes that appear in the NOTE_LINE_NUMBER field
628 for kinds of notes that are not line numbers.
630 Notice that we do not try to use zero here for any of
631 the special note codes because sometimes the source line
632 actually can be zero! This happens (for example) when we
633 are generating code for the per-translation-unit constructor
634 and destructor routines for some C++ translation unit.
636 If you should change any of the following values, or if you
637 should add a new value here, don't forget to change the
638 note_insn_name array in rtl.c. */
642 /* Keep all of these numbers negative. Adjust as needed. */
643 NOTE_INSN_BIAS = -100,
645 /* This note is used to get rid of an insn
646 when it isn't safe to patch the insn out of the chain. */
649 /* These are used to mark the beginning and end of a lexical block.
650 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
654 /* These mark the extremes of a loop. */
658 /* Generated at the place in a loop that `continue' jumps to. */
660 /* Generated at the start of a duplicated exit test. */
663 /* This kind of note is generated at the end of the function body,
664 just before the return insn or return label. In an optimizing
665 compilation it is deleted by the first jump optimization, after
666 enabling that optimizer to determine whether control can fall
667 off the end of the function body without a return statement. */
668 NOTE_INSN_FUNCTION_END,
670 /* This marks the point immediately after the last prologue insn. */
671 NOTE_INSN_PROLOGUE_END,
673 /* This marks the point immediately prior to the first epilogue insn. */
674 NOTE_INSN_EPILOGUE_BEG,
676 /* Generated in place of user-declared labels when they are deleted. */
677 NOTE_INSN_DELETED_LABEL,
679 /* This note indicates the start of the real body of the function,
680 i.e. the point just after all of the parms have been moved into
682 NOTE_INSN_FUNCTION_BEG,
684 /* These note where exception handling regions begin and end.
685 Uses NOTE_EH_HANDLER to identify the region in question. */
686 NOTE_INSN_EH_REGION_BEG,
687 NOTE_INSN_EH_REGION_END,
689 /* Generated whenever a duplicate line number note is output. For example,
690 one is output after the end of an inline function, in order to prevent
691 the line containing the inline call from being counted twice in gcov. */
692 NOTE_INSN_REPEATED_LINE_NUMBER,
694 /* Start/end of a live range region, where pseudos allocated on the stack
695 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
699 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
702 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
703 NOTE_INSN_BASIC_BLOCK,
705 /* Record the expected value of a register at a location. Uses
706 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
707 NOTE_INSN_EXPECTED_VALUE,
712 /* Names for NOTE insn's other than line numbers. */
714 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
715 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
716 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
718 /* The name of a label, in case it corresponds to an explicit label
719 in the input source code. */
720 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
722 /* In jump.c, each label contains a count of the number
723 of LABEL_REFs that point at it, so unused labels can be deleted. */
724 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
726 /* Associate a name with a CODE_LABEL. */
727 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
729 /* The original regno this ADDRESSOF was built for. */
730 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
732 /* The variable in the register we took the address of. */
733 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
735 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
736 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
737 be decremented and possibly the label can be deleted. */
738 #define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
740 /* Once basic blocks are found in flow.c,
741 each CODE_LABEL starts a chain that goes through
742 all the LABEL_REFs that jump to that label.
743 The chain eventually winds up at the CODE_LABEL: it is circular. */
744 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
746 /* This is the field in the LABEL_REF through which the circular chain
747 of references to a particular label is linked.
748 This chain is set up in flow.c. */
750 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
752 /* Once basic blocks are found in flow.c,
753 Each LABEL_REF points to its containing instruction with this field. */
755 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
757 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
758 the number the register originally had; for a pseudo register turned into
759 a hard reg this will hold the old pseudo register number. */
761 #define REGNO(RTX) XCUINT(RTX, 0, REG)
762 #define ORIGINAL_REGNO(RTX) X0UINT(RTX, 1)
764 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
765 is the current function's return value. */
767 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
769 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
770 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
772 /* 1 in a REG rtx if the register is a pointer. */
773 #define REG_POINTER(RTX) ((RTX)->frame_related)
775 /* 1 if the given register REG corresponds to a hard register. */
776 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
778 /* 1 if the given register number REG_NO corresponds to a hard register. */
779 #define HARD_REGISTER_NUM_P(REG_NO) (REG_NO < FIRST_PSEUDO_REGISTER)
781 /* For a CONST_INT rtx, INTVAL extracts the integer. */
783 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
785 /* For a CONST_DOUBLE:
786 The usual two ints that hold the value.
787 For a DImode, that is all there are;
788 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
789 For a float, the number of ints varies,
790 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
791 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
792 #define CONST_DOUBLE_LOW(r) XCWINT (r, 2, CONST_DOUBLE)
793 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 3, CONST_DOUBLE)
795 /* Link for chain of all CONST_DOUBLEs in use in current function. */
796 #define CONST_DOUBLE_CHAIN(r) XCEXP (r, 1, CONST_DOUBLE)
797 /* The MEM which represents this CONST_DOUBLE's value in memory,
798 or const0_rtx if no MEM has been made for it yet,
799 or cc0_rtx if it is not on the chain. */
800 #define CONST_DOUBLE_MEM(r) XCEXP (r, 0, CONST_DOUBLE)
802 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
803 SUBREG_BYTE extracts the byte-number. */
805 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
806 #define SUBREG_BYTE(RTX) XCUINT(RTX, 1, SUBREG)
809 extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
813 extern unsigned int subreg_regno PARAMS ((rtx));
815 /* 1 if the REG contained in SUBREG_REG is already known to be
816 sign- or zero-extended from the mode of the SUBREG to the mode of
817 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
820 When used as a LHS, is means that this extension must be done
821 when assigning to SUBREG_REG. */
823 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
824 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
826 /* Access various components of an ASM_OPERANDS rtx. */
828 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
829 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
830 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
831 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
832 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
833 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
834 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
835 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
836 XCVECEXP ((RTX), 4, (N), ASM_OPERANDS)
837 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
838 XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
839 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
840 GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
841 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
842 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
844 /* For a MEM rtx, 1 if it's a volatile reference.
845 Also in an ASM_OPERANDS rtx. */
846 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
848 /* For a MEM rtx, 1 if it refers to an aggregate, either to the
849 aggregate itself of to a field of the aggregate. If zero, RTX may
850 or may not be such a reference. */
851 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
853 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
854 not refer to a scalar.*/
855 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
857 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
858 RTX. Otherwise, vice versa. Use this macro only when you are
859 *sure* that you know that the MEM is in a structure, or is a
860 scalar. VAL is evaluated only once. */
861 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
864 MEM_IN_STRUCT_P (RTX) = 1; \
865 MEM_SCALAR_P (RTX) = 0; \
869 MEM_IN_STRUCT_P (RTX) = 0; \
870 MEM_SCALAR_P (RTX) = 1; \
874 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
875 set, and may alias anything. Otherwise, the MEM can only alias
876 MEMs in the same alias set. This value is set in a
877 language-dependent manner in the front-end, and should not be
878 altered in the back-end. These set numbers are tested for zero,
879 and compared for equality; they have no other significance. In
880 some front-ends, these numbers may correspond in some way to types,
881 or other language-level entities, but they need not, and the
882 back-end makes no such assumptions. */
883 #define MEM_ALIAS_SET(RTX) XCWINT(RTX, 1, MEM)
885 /* Copy the attributes that apply to memory locations from RHS to LHS. */
886 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
887 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
888 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
889 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
890 MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS), \
891 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
893 /* For a LABEL_REF, 1 means that this reference is to a label outside the
894 loop containing the reference. */
895 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
897 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
898 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
899 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
901 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
902 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
904 /* For a REG, 1 means the register is used only in an exit test of a loop. */
905 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
907 /* During sched, for an insn, 1 means that the insn must be scheduled together
908 with the preceding insn. */
909 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
911 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
912 cost of the dependence link. The cost of executing an instruction
913 may vary based on how the results are used. LINK_COST_ZERO is 1 when
914 the cost through the link varies and is unchanged (i.e., the link has
915 zero additional cost). LINK_COST_FREE is 1 when the cost through the
916 link is zero (i.e., the link makes the cost free). In other cases,
917 the adjustment to the cost is recomputed each time it is needed. */
918 #define LINK_COST_ZERO(X) ((X)->jump)
919 #define LINK_COST_FREE(X) ((X)->call)
921 /* For a SET rtx, SET_DEST is the place that is set
922 and SET_SRC is the value it is set to. */
923 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
924 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
926 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
927 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
928 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
930 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
931 conditionally executing the code on, COND_EXEC_CODE is the code
932 to execute if the condition is true. */
933 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
934 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
936 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
937 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
939 /* 1 in a SYMBOL_REF if it addresses this function's string constant pool. */
940 #define STRING_POOL_ADDRESS_P(RTX) ((RTX)->frame_related)
942 /* Flag in a SYMBOL_REF for machine-specific purposes. */
943 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
945 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
946 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
948 /* 1 means a SYMBOL_REF is weak. */
949 #define SYMBOL_REF_WEAK(RTX) ((RTX)->integrated)
951 /* Define a macro to look for REG_INC notes,
952 but save time on machines where they never exist. */
954 /* Don't continue this line--convex cc version 4.1 would lose. */
955 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
956 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
958 #define FIND_REG_INC_NOTE(insn, reg) 0
961 /* Indicate whether the machine has any sort of auto increment addressing.
962 If not, we can avoid checking for REG_INC notes. */
964 /* Don't continue this line--convex cc version 4.1 would lose. */
965 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
969 #ifndef HAVE_PRE_INCREMENT
970 #define HAVE_PRE_INCREMENT 0
973 #ifndef HAVE_PRE_DECREMENT
974 #define HAVE_PRE_DECREMENT 0
977 #ifndef HAVE_POST_INCREMENT
978 #define HAVE_POST_INCREMENT 0
981 #ifndef HAVE_POST_DECREMENT
982 #define HAVE_POST_DECREMENT 0
985 #ifndef HAVE_POST_MODIFY_DISP
986 #define HAVE_POST_MODIFY_DISP 0
989 #ifndef HAVE_POST_MODIFY_REG
990 #define HAVE_POST_MODIFY_REG 0
993 #ifndef HAVE_PRE_MODIFY_DISP
994 #define HAVE_PRE_MODIFY_DISP 0
997 #ifndef HAVE_PRE_MODIFY_REG
998 #define HAVE_PRE_MODIFY_REG 0
1002 /* Some architectures do not have complete pre/post increment/decrement
1003 instruction sets, or only move some modes efficiently. These macros
1004 allow us to tune autoincrement generation. */
1006 #ifndef USE_LOAD_POST_INCREMENT
1007 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1010 #ifndef USE_LOAD_POST_DECREMENT
1011 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1014 #ifndef USE_LOAD_PRE_INCREMENT
1015 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1018 #ifndef USE_LOAD_PRE_DECREMENT
1019 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1022 #ifndef USE_STORE_POST_INCREMENT
1023 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1026 #ifndef USE_STORE_POST_DECREMENT
1027 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1030 #ifndef USE_STORE_PRE_INCREMENT
1031 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1034 #ifndef USE_STORE_PRE_DECREMENT
1035 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1039 /* Accessors for RANGE_INFO. */
1040 /* For RANGE_{START,END} notes return the RANGE_START note. */
1041 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
1043 /* For RANGE_{START,END} notes return the RANGE_START note. */
1044 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
1046 /* For RANGE_{START,END} notes, return the vector containing the registers used
1048 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1049 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1050 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
1052 /* For RANGE_{START,END} notes, the number of calls within the range. */
1053 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
1055 /* For RANGE_{START,END} notes, the number of insns within the range. */
1056 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
1058 /* For RANGE_{START,END} notes, a unique # to identify this range. */
1059 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
1061 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
1062 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
1064 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
1065 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
1067 /* For RANGE_{START,END} notes, the loop depth the range is in. */
1068 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
1070 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
1072 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
1074 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
1076 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
1078 /* For RANGE_START notes, the marker # of the start of the range. */
1079 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
1081 /* For RANGE_START notes, the marker # of the end of the range. */
1082 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
1084 /* Original pseudo register # for a live range note. */
1085 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
1087 /* Pseudo register # original register is copied into or -1. */
1088 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
1090 /* How many times a register in a live range note was referenced. */
1091 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
1093 /* How many times a register in a live range note was set. */
1094 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
1096 /* How many times a register in a live range note died. */
1097 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
1099 /* Whether the original value is needed to be copied into the range register at
1100 the start of the range. */
1101 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
1103 /* # of insns the register copy is live over. */
1104 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
1106 /* # of calls the register copy is live over. */
1107 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1109 /* DECL_NODE pointer of the declaration if the register is a user defined
1111 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1113 /* BLOCK_NODE pointer to the block the variable is declared in if the
1114 register is a user defined variable. */
1115 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1117 /* EXPR_LIST of the distinct ranges a variable is in. */
1118 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1120 /* Block a variable is declared in. */
1121 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1123 /* # of distinct ranges a variable is in. */
1124 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1126 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1127 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1129 /* For a NOTE_INSN_LIVE note, the original basic block number. */
1130 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1132 /* Determine if the insn is a PHI node. */
1133 #define PHI_NODE_P(X) \
1134 (X && GET_CODE (X) == INSN \
1135 && GET_CODE (PATTERN (X)) == SET \
1136 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1138 /* Nonzero if we need to distinguish between the return value of this function
1139 and the return value of a function called by this function. This helps
1141 This is 1 until after the rtl generation pass. */
1142 extern int rtx_equal_function_value_matters;
1144 /* Nonzero when we are generating CONCATs. */
1145 extern int generating_concat_p;
1147 /* Generally useful functions. */
1150 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1152 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1155 extern rtx expand_builtin_expect_jump PARAMS ((union tree_node *, rtx, rtx));
1158 extern void set_stack_check_libfunc PARAMS ((rtx));
1159 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1160 enum machine_mode));
1161 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1162 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1163 extern void optimize_save_area_alloca PARAMS ((rtx));
1166 extern rtx gen_rtx PARAMS ((enum rtx_code,
1167 enum machine_mode, ...));
1168 extern rtvec gen_rtvec PARAMS ((int, ...));
1170 /* In other files */
1171 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1172 extern rtvec rtvec_alloc PARAMS ((int));
1173 extern rtx copy_insn_1 PARAMS ((rtx));
1174 extern rtx copy_insn PARAMS ((rtx));
1177 extern rtx copy_rtx PARAMS ((rtx));
1180 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1183 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1184 extern rtx shallow_copy_rtx PARAMS ((rtx));
1185 extern int rtx_equal_p PARAMS ((rtx, rtx));
1188 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1189 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1190 extern rtx gen_label_rtx PARAMS ((void));
1191 extern int subreg_hard_regno PARAMS ((rtx, int));
1192 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1193 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1196 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1199 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1200 extern rtx gen_highpart_mode PARAMS ((enum machine_mode,
1201 enum machine_mode, rtx));
1202 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1203 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1204 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1205 enum machine_mode));
1206 extern rtx constant_subword PARAMS ((rtx, int,
1207 enum machine_mode));
1210 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1211 enum machine_mode));
1212 extern int subreg_lowpart_p PARAMS ((rtx));
1213 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1214 enum machine_mode));
1215 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1216 enum machine_mode));
1217 extern rtx make_safe_from PARAMS ((rtx, rtx));
1218 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1219 extern rtx get_insns PARAMS ((void));
1220 extern const char *get_insn_name PARAMS ((int));
1221 extern rtx get_last_insn PARAMS ((void));
1222 extern rtx get_last_insn_anywhere PARAMS ((void));
1223 extern void start_sequence PARAMS ((void));
1224 extern void push_to_sequence PARAMS ((rtx));
1225 extern void end_sequence PARAMS ((void));
1226 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1227 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1228 extern rtx gen_sequence PARAMS ((void));
1231 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1232 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1235 extern rtx get_pool_constant PARAMS ((rtx));
1236 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1237 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1238 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1239 extern int get_pool_offset PARAMS ((rtx));
1240 extern rtx simplify_subtraction PARAMS ((rtx));
1243 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1244 HOST_WIDE_INT, int));
1245 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1246 HOST_WIDE_INT, int));
1247 extern rtx assign_temp PARAMS ((union tree_node *,
1250 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1251 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1252 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1253 extern rtx emit_barrier_before PARAMS ((rtx));
1254 extern rtx emit_label_before PARAMS ((rtx, rtx));
1255 extern rtx emit_note_before PARAMS ((int, rtx));
1256 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1257 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1258 extern rtx emit_barrier_after PARAMS ((rtx));
1259 extern rtx emit_label_after PARAMS ((rtx, rtx));
1260 extern rtx emit_note_after PARAMS ((int, rtx));
1261 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1262 extern rtx emit_insn PARAMS ((rtx));
1263 extern rtx emit_insns PARAMS ((rtx));
1264 extern rtx emit_insns_before PARAMS ((rtx, rtx));
1265 extern rtx emit_insns_after PARAMS ((rtx, rtx));
1266 extern rtx emit_jump_insn PARAMS ((rtx));
1267 extern rtx emit_call_insn PARAMS ((rtx));
1268 extern rtx emit_label PARAMS ((rtx));
1269 extern rtx emit_barrier PARAMS ((void));
1270 extern rtx emit_line_note PARAMS ((const char *, int));
1271 extern rtx emit_note PARAMS ((const char *, int));
1272 extern rtx emit_line_note_force PARAMS ((const char *, int));
1273 extern rtx make_insn_raw PARAMS ((rtx));
1274 extern rtx previous_insn PARAMS ((rtx));
1275 extern rtx next_insn PARAMS ((rtx));
1276 extern rtx prev_nonnote_insn PARAMS ((rtx));
1277 extern rtx next_nonnote_insn PARAMS ((rtx));
1278 extern rtx prev_real_insn PARAMS ((rtx));
1279 extern rtx next_real_insn PARAMS ((rtx));
1280 extern rtx prev_active_insn PARAMS ((rtx));
1281 extern rtx next_active_insn PARAMS ((rtx));
1282 extern int active_insn_p PARAMS ((rtx));
1283 extern rtx prev_label PARAMS ((rtx));
1284 extern rtx next_label PARAMS ((rtx));
1285 extern rtx next_cc0_user PARAMS ((rtx));
1286 extern rtx prev_cc0_setter PARAMS ((rtx));
1289 extern rtx next_nondeleted_insn PARAMS ((rtx));
1290 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1291 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1292 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1293 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1294 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1295 extern void mark_jump_label PARAMS ((rtx, rtx, int));
1296 extern void cleanup_barriers PARAMS ((void));
1299 extern rtx squeeze_notes PARAMS ((rtx, rtx));
1300 extern rtx delete_insn PARAMS ((rtx));
1301 extern void delete_jump PARAMS ((rtx));
1302 extern void delete_barrier PARAMS ((rtx));
1303 extern rtx get_label_before PARAMS ((rtx));
1304 extern rtx get_label_after PARAMS ((rtx));
1305 extern rtx follow_jumps PARAMS ((rtx));
1308 extern rtx *find_constant_term_loc PARAMS ((rtx *));
1311 extern rtx try_split PARAMS ((rtx, rtx, int));
1312 extern int split_branch_probability;
1314 /* In unknown file */
1315 extern rtx split_insns PARAMS ((rtx, rtx));
1317 /* In simplify-rtx.c */
1318 extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1319 enum machine_mode, rtx,
1320 enum machine_mode));
1321 extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1322 enum machine_mode, rtx,
1324 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1326 enum machine_mode, rtx, rtx,
1328 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1329 enum machine_mode, rtx,
1331 extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1334 extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1335 enum machine_mode, rtx,
1336 enum machine_mode));
1337 extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1341 extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
1345 extern rtx simplify_subreg PARAMS ((enum machine_mode,
1349 extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1353 extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
1354 extern rtx simplify_rtx PARAMS ((rtx));
1355 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1358 extern rtx gen_mem_addressof PARAMS ((rtx, union tree_node *));
1361 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1365 extern void set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1367 /* Functions in rtlanal.c */
1369 /* Single set is implemented as macro for performance reasons. */
1370 #define single_set(I) (INSN_P (I) \
1371 ? (GET_CODE (PATTERN (I)) == SET \
1372 ? PATTERN (I) : single_set_1 (I)) \
1374 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1376 extern int rtx_addr_can_trap_p PARAMS ((rtx));
1377 extern int rtx_unstable_p PARAMS ((rtx));
1378 extern int rtx_varies_p PARAMS ((rtx, int));
1379 extern int rtx_addr_varies_p PARAMS ((rtx, int));
1380 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1381 extern rtx get_related_value PARAMS ((rtx));
1382 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1383 extern int count_occurrences PARAMS ((rtx, rtx, int));
1384 extern int reg_referenced_p PARAMS ((rtx, rtx));
1385 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1386 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1387 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1388 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1389 extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
1390 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1391 extern int no_labels_between_p PARAMS ((rtx, rtx));
1392 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1393 extern int modified_in_p PARAMS ((rtx, rtx));
1394 extern int insn_dependent_p PARAMS ((rtx, rtx));
1395 extern int reg_set_p PARAMS ((rtx, rtx));
1396 extern rtx single_set_2 PARAMS ((rtx, rtx));
1397 extern int multiple_sets PARAMS ((rtx));
1398 extern int set_noop_p PARAMS ((rtx));
1399 extern int noop_move_p PARAMS ((rtx));
1400 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1401 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1403 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1404 extern rtx set_of PARAMS ((rtx, rtx));
1405 extern void note_stores PARAMS ((rtx,
1406 void (*) (rtx, rtx, void *),
1408 extern void note_uses PARAMS ((rtx *,
1409 void (*) (rtx *, void *),
1411 extern rtx reg_set_last PARAMS ((rtx, rtx));
1412 extern int dead_or_set_p PARAMS ((rtx, rtx));
1413 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1414 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1415 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1417 extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
1418 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1419 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1421 extern void remove_note PARAMS ((rtx, rtx));
1422 extern int side_effects_p PARAMS ((rtx));
1423 extern int volatile_refs_p PARAMS ((rtx));
1424 extern int volatile_insn_p PARAMS ((rtx));
1425 extern int may_trap_p PARAMS ((rtx));
1426 extern int inequality_comparisons_p PARAMS ((rtx));
1427 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1428 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1430 extern int computed_jump_p PARAMS ((rtx));
1431 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1432 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1433 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1434 extern int auto_inc_p PARAMS ((rtx));
1435 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1436 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1437 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1438 extern rtx find_first_parameter_load PARAMS ((rtx, rtx));
1442 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1443 void init_EXPR_INSN_LIST_cache PARAMS ((void));
1444 void free_EXPR_LIST_list PARAMS ((rtx *));
1445 void free_INSN_LIST_list PARAMS ((rtx *));
1446 void free_EXPR_LIST_node PARAMS ((rtx));
1447 void free_INSN_LIST_node PARAMS ((rtx));
1448 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1449 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1450 void clear_log_links PARAMS ((rtx));
1454 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1455 Always at least 3, since the combiner could put that many togetherm
1456 and we want this to remain correct for all the remaining passes. */
1458 extern int max_parallel;
1460 /* Free up register info memory. */
1461 extern void free_reg_info PARAMS ((void));
1464 extern int asm_noperands PARAMS ((rtx));
1465 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1467 enum machine_mode *));
1469 extern enum reg_class reg_preferred_class PARAMS ((int));
1470 extern enum reg_class reg_alternate_class PARAMS ((int));
1472 extern rtx get_first_nonparm_insn PARAMS ((void));
1474 extern void split_all_insns PARAMS ((int));
1475 extern void split_all_insns_noflow PARAMS ((void));
1477 #define MAX_SAVED_CONST_INT 64
1478 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1480 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1481 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1482 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1483 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1484 extern rtx const_true_rtx;
1486 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1488 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1489 same as VOIDmode. */
1491 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1493 /* Likewise, for the constants 1 and 2. */
1495 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1496 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1498 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1499 is used to represent the frame pointer. This is because the
1500 hard frame pointer and the automatic variables are separated by an amount
1501 that cannot be determined until after register allocation. We can assume
1502 that in this case ELIMINABLE_REGS will be defined, one action of which
1503 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1504 #ifndef HARD_FRAME_POINTER_REGNUM
1505 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1508 /* Index labels for global_rtl. */
1509 enum global_rtl_index
1515 /* For register elimination to work properly these hard_frame_pointer_rtx,
1516 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1517 the same register. */
1518 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1519 GR_ARG_POINTER = GR_FRAME_POINTER,
1521 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1522 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1524 GR_HARD_FRAME_POINTER,
1526 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1527 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1528 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1533 GR_VIRTUAL_INCOMING_ARGS,
1534 GR_VIRTUAL_STACK_ARGS,
1535 GR_VIRTUAL_STACK_DYNAMIC,
1536 GR_VIRTUAL_OUTGOING_ARGS,
1542 /* Pointers to standard pieces of rtx are stored here. */
1543 extern rtx global_rtl[GR_MAX];
1545 /* Standard pieces of rtx, to be substituted directly into things. */
1546 #define pc_rtx (global_rtl[GR_PC])
1547 #define cc0_rtx (global_rtl[GR_CC0])
1549 /* All references to certain hard regs, except those created
1550 by allocating pseudo regs into them (when that's possible),
1551 go through these unique rtx objects. */
1552 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1553 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1554 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1555 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1557 extern rtx pic_offset_table_rtx;
1558 extern rtx struct_value_rtx;
1559 extern rtx struct_value_incoming_rtx;
1560 extern rtx static_chain_rtx;
1561 extern rtx static_chain_incoming_rtx;
1562 extern rtx return_address_pointer_rtx;
1564 /* Include the RTL generation functions. */
1570 /* There are some RTL codes that require special attention; the
1571 generation functions included above do the raw handling. If you
1572 add to this list, modify special_rtx in gengenrtl.c as well. You
1573 should also modify gen_rtx to use the special function. */
1575 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1576 HOST_WIDE_INT, HOST_WIDE_INT));
1577 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1578 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1579 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1580 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1581 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1583 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1585 /* We need the cast here to ensure that we get the same result both with
1586 and without prototypes. */
1587 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1589 /* Virtual registers are used during RTL generation to refer to locations into
1590 the stack frame when the actual location isn't known until RTL generation
1591 is complete. The routine instantiate_virtual_regs replaces these with
1592 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1595 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1597 /* This points to the first word of the incoming arguments passed on the stack,
1598 either by the caller or by the callee when pretending it was passed by the
1601 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1603 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1605 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1606 variable on the stack. Otherwise, it points to the first variable on
1609 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1611 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1613 /* This points to the location of dynamically-allocated memory on the stack
1614 immediately after the stack pointer has been adjusted by the amount
1617 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1619 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1621 /* This points to the location in the stack at which outgoing arguments should
1622 be written when the stack is pre-pushed (arguments pushed using push
1623 insns always use sp). */
1625 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1627 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1629 /* This points to the Canonical Frame Address of the function. This
1630 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1631 but is calculated relative to the arg pointer for simplicity; the
1632 frame pointer nor stack pointer are necessarily fixed relative to
1633 the CFA until after reload. */
1635 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1637 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1639 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1641 /* REGNUM never really appearing in the INSN stream. */
1642 #define INVALID_REGNUM (~(unsigned int)0)
1644 extern rtx find_next_ref PARAMS ((rtx, rtx));
1646 extern rtx output_constant_def PARAMS ((union tree_node *, int));
1647 extern rtx immed_real_const PARAMS ((union tree_node *));
1649 /* Define a default value for STORE_FLAG_VALUE. */
1651 #ifndef STORE_FLAG_VALUE
1652 #define STORE_FLAG_VALUE 1
1655 /* Nonzero after the second flow pass has completed.
1656 Set to 1 or 0 by toplev.c */
1657 extern int flow2_completed;
1659 /* Nonzero after end of reload pass.
1660 Set to 1 or 0 by reload1.c. */
1662 extern int reload_completed;
1664 /* Set to 1 while reload_as_needed is operating.
1665 Required by some machines to handle any generated moves differently. */
1667 extern int reload_in_progress;
1669 /* If this is nonzero, we do not bother generating VOLATILE
1670 around volatile memory references, and we are willing to
1671 output indirect addresses. If cse is to follow, we reject
1672 indirect addresses so a useful potential cse is generated;
1673 if it is used only once, instruction combination will produce
1674 the same indirect address eventually. */
1675 extern int cse_not_expected;
1677 /* Set to nonzero before life analysis to indicate that it is unsafe to
1678 generate any new pseudo registers. */
1679 extern int no_new_pseudos;
1681 /* Translates rtx code to tree code, for those codes needed by
1682 REAL_ARITHMETIC. The function returns an int because the caller may not
1683 know what `enum tree_code' means. */
1685 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1689 extern void gcc_obstack_init PARAMS ((struct obstack *));
1692 struct cse_basic_block_data;
1694 /* Return the right cost to give to an operation
1695 to make the cost of the corresponding register-to-register instruction
1696 N times that of a fast register-to-register instruction. */
1697 #define COSTS_N_INSNS(N) ((N) * 4)
1699 /* Maximum cost of a rtl expression. This value has the special meaning
1700 not to use an rtx with this cost under any circumstances. */
1701 #define MAX_COST INT_MAX
1703 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1704 extern int address_cost PARAMS ((rtx, enum machine_mode));
1705 extern void delete_trivially_dead_insns PARAMS ((rtx, int, int));
1707 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1709 extern void cse_end_of_basic_block PARAMS ((rtx,
1710 struct cse_basic_block_data *,
1714 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1715 extern int condjump_p PARAMS ((rtx));
1716 extern int any_condjump_p PARAMS ((rtx));
1717 extern int any_uncondjump_p PARAMS ((rtx));
1718 extern int safe_to_remove_jump_p PARAMS ((rtx));
1719 extern rtx pc_set PARAMS ((rtx));
1720 extern rtx condjump_label PARAMS ((rtx));
1721 extern int simplejump_p PARAMS ((rtx));
1722 extern int returnjump_p PARAMS ((rtx));
1723 extern int onlyjump_p PARAMS ((rtx));
1724 extern int sets_cc0_p PARAMS ((rtx));
1725 extern int invert_jump_1 PARAMS ((rtx, rtx));
1726 extern int invert_jump PARAMS ((rtx, rtx, int));
1727 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1728 extern int true_regnum PARAMS ((rtx));
1729 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1730 extern int redirect_jump PARAMS ((rtx, rtx, int));
1731 extern void rebuild_jump_labels PARAMS ((rtx));
1732 extern void thread_jumps PARAMS ((rtx, int, int));
1733 extern int rtx_equal_for_thread_p PARAMS ((rtx, rtx, rtx));
1734 extern int can_reverse_comparison_p PARAMS ((rtx, rtx));
1735 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1736 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1738 extern void delete_for_peephole PARAMS ((rtx, rtx));
1739 extern int condjump_in_parallel_p PARAMS ((rtx));
1740 extern void never_reached_warning PARAMS ((rtx));
1741 extern void purge_line_number_notes PARAMS ((rtx));
1742 extern void copy_loop_headers PARAMS ((rtx));
1744 /* In emit-rtl.c. */
1745 extern int max_reg_num PARAMS ((void));
1746 extern int max_label_num PARAMS ((void));
1747 extern int get_first_label_num PARAMS ((void));
1748 extern void delete_insns_since PARAMS ((rtx));
1749 extern void mark_reg_pointer PARAMS ((rtx, int));
1750 extern void mark_user_reg PARAMS ((rtx));
1751 extern void reset_used_flags PARAMS ((rtx));
1752 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1753 extern int get_max_uid PARAMS ((void));
1754 extern int in_sequence_p PARAMS ((void));
1755 extern void force_next_line_note PARAMS ((void));
1756 extern void clear_emit_caches PARAMS ((void));
1757 extern void init_emit PARAMS ((void));
1758 extern void init_emit_once PARAMS ((int));
1759 extern void push_topmost_sequence PARAMS ((void));
1760 extern void pop_topmost_sequence PARAMS ((void));
1761 extern int subreg_realpart_p PARAMS ((rtx));
1762 extern void reverse_comparison PARAMS ((rtx));
1763 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1764 extern void set_new_first_and_last_label_num PARAMS ((int, int));
1765 extern void set_new_last_label_num PARAMS ((int));
1766 extern void unshare_all_rtl_again PARAMS ((rtx));
1767 extern void set_last_insn PARAMS ((rtx));
1768 extern void link_cc0_insns PARAMS ((rtx));
1769 extern void add_insn PARAMS ((rtx));
1770 extern void add_insn_before PARAMS ((rtx, rtx));
1771 extern void add_insn_after PARAMS ((rtx, rtx));
1772 extern void remove_insn PARAMS ((rtx));
1773 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1774 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1775 extern enum rtx_code classify_insn PARAMS ((rtx));
1776 extern rtx emit PARAMS ((rtx));
1777 /* Query and clear/ restore no_line_numbers. This is used by the
1778 switch / case handling in stmt.c to give proper line numbers in
1779 warnings about unreachable code. */
1780 int force_line_numbers PARAMS ((void));
1781 void restore_line_number_status PARAMS ((int old_value));
1782 extern void renumber_insns PARAMS ((FILE *));
1783 extern void remove_unnecessary_notes PARAMS ((void));
1786 extern int combine_instructions PARAMS ((rtx, unsigned int));
1787 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
1788 extern rtx remove_death PARAMS ((unsigned int, rtx));
1790 extern void dump_combine_stats PARAMS ((FILE *));
1791 extern void dump_combine_total_stats PARAMS ((FILE *));
1796 extern void schedule_insns PARAMS ((FILE *));
1797 extern void schedule_ebbs PARAMS ((FILE *));
1799 extern void fix_sched_param PARAMS ((const char *, const char *));
1801 /* In print-rtl.c */
1802 extern const char *print_rtx_head;
1803 extern void debug_rtx PARAMS ((rtx));
1804 extern void debug_rtx_list PARAMS ((rtx, int));
1805 extern void debug_rtx_range PARAMS ((rtx, rtx));
1806 extern rtx debug_rtx_find PARAMS ((rtx, int));
1808 extern void print_rtl PARAMS ((FILE *, rtx));
1809 extern void print_simple_rtl PARAMS ((FILE *, rtx));
1810 extern int print_rtl_single PARAMS ((FILE *, rtx));
1811 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
1815 extern void init_loop PARAMS ((void));
1816 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
1818 extern void loop_optimize PARAMS ((rtx, FILE *, int));
1820 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
1823 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
1824 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
1825 extern int prologue_epilogue_contains PARAMS ((rtx));
1826 extern int sibcall_epilogue_contains PARAMS ((rtx));
1827 extern void preserve_rtl_expr_result PARAMS ((rtx));
1828 extern void mark_temp_addr_taken PARAMS ((rtx));
1829 extern void update_temp_slot_address PARAMS ((rtx, rtx));
1830 extern void purge_addressof PARAMS ((rtx));
1831 extern void purge_hard_subreg_sets PARAMS ((rtx));
1834 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
1835 extern void expand_null_return PARAMS ((void));
1836 extern void emit_jump PARAMS ((rtx));
1837 extern int preserve_subexpressions_p PARAMS ((void));
1840 extern void move_by_pieces PARAMS ((rtx, rtx,
1841 unsigned HOST_WIDE_INT,
1845 extern void recompute_reg_usage PARAMS ((rtx, int));
1847 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
1848 extern void dump_flow_info PARAMS ((FILE *));
1852 extern void init_expmed PARAMS ((void));
1853 extern void expand_inc PARAMS ((rtx, rtx));
1854 extern void expand_dec PARAMS ((rtx, rtx));
1855 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
1856 unsigned HOST_WIDE_INT, rtx,
1861 extern int gcse_main PARAMS ((rtx, FILE *));
1865 extern void mark_elimination PARAMS ((int, int));
1867 extern int global_alloc PARAMS ((FILE *));
1868 extern void dump_global_regs PARAMS ((FILE *));
1871 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
1873 extern void build_insn_chain PARAMS ((rtx));
1876 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
1877 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
1878 extern void globalize_reg PARAMS ((int));
1879 extern void init_regs PARAMS ((void));
1880 extern void init_reg_sets PARAMS ((void));
1881 extern void regset_release_memory PARAMS ((void));
1882 extern void regclass_init PARAMS ((void));
1883 extern void regclass PARAMS ((rtx, int, FILE *));
1884 extern void reg_scan PARAMS ((rtx, unsigned int, int));
1885 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
1886 extern void fix_register PARAMS ((const char *, int, int));
1888 extern void delete_null_pointer_checks PARAMS ((rtx));
1892 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
1894 extern void combine_stack_adjustments PARAMS ((void));
1898 extern void dbr_schedule PARAMS ((rtx, FILE *));
1901 /* In local-alloc.c */
1903 extern void dump_local_alloc PARAMS ((FILE *));
1905 extern int local_alloc PARAMS ((void));
1906 extern int function_invariant_p PARAMS ((rtx));
1909 extern void init_branch_prob PARAMS ((const char *));
1910 extern void branch_prob PARAMS ((void));
1911 extern void end_branch_prob PARAMS ((void));
1912 extern void output_func_start_profiler PARAMS ((void));
1914 /* In reg-stack.c */
1916 extern void reg_to_stack PARAMS ((rtx, FILE *));
1919 /* In fold-const.c */
1920 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1921 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1922 unsigned HOST_WIDE_INT *,
1924 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1925 unsigned HOST_WIDE_INT *,
1927 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
1929 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1930 unsigned HOST_WIDE_INT *,
1932 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1933 HOST_WIDE_INT, unsigned int,
1934 unsigned HOST_WIDE_INT *,
1935 HOST_WIDE_INT *, int));
1936 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1937 HOST_WIDE_INT, unsigned int,
1938 unsigned HOST_WIDE_INT *,
1939 HOST_WIDE_INT *, int));
1940 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1941 HOST_WIDE_INT, unsigned int,
1942 unsigned HOST_WIDE_INT *,
1944 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1945 HOST_WIDE_INT, unsigned int,
1946 unsigned HOST_WIDE_INT *,
1955 LCT_CONST_MAKE_BLOCK = 3,
1956 LCT_PURE_MAKE_BLOCK = 4,
1959 LCT_ALWAYS_RETURN = 7
1962 extern void emit_library_call PARAMS ((rtx, enum libcall_type,
1963 enum machine_mode, int,
1965 extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
1966 enum machine_mode, int,
1970 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
1973 extern int in_data_section PARAMS ((void));
1974 extern void init_varasm_once PARAMS ((void));
1977 extern void init_rtl PARAMS ((void));
1978 extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
1980 struct md_constant { char *name, *value; };
1983 extern int read_skip_spaces PARAMS ((FILE *));
1984 extern rtx read_rtx PARAMS ((FILE *));
1987 extern const char *read_rtx_filename;
1988 extern int read_rtx_lineno;
1990 /* Redefine abort to report an internal error w/o coredump, and
1991 reporting the location of the error in the source file. This logic
1992 is duplicated in rtl.h and tree.h because every file that needs the
1993 special abort includes one or both. toplev.h gets too few files,
1994 system.h gets too many. */
1996 extern void fancy_abort PARAMS ((const char *, int, const char *))
1998 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
2001 extern rtx canon_rtx PARAMS ((rtx));
2002 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2003 int (*)(rtx, int)));
2004 extern rtx get_addr PARAMS ((rtx));
2005 extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2006 rtx, int (*)(rtx, int)));
2007 extern int read_dependence PARAMS ((rtx, rtx));
2008 extern int anti_dependence PARAMS ((rtx, rtx));
2009 extern int output_dependence PARAMS ((rtx, rtx));
2010 extern void mark_constant_function PARAMS ((void));
2011 extern void init_alias_once PARAMS ((void));
2012 extern void init_alias_analysis PARAMS ((void));
2013 extern void end_alias_analysis PARAMS ((void));
2014 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
2015 extern void set_mem_alias_set PARAMS ((rtx, HOST_WIDE_INT));
2019 sibcall_use_normal = 1,
2020 sibcall_use_tail_recursion,
2024 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2025 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2028 extern int stack_regs_mentioned PARAMS ((rtx insn));
2032 extern rtx stack_limit_rtx;
2034 /* In regrename.c */
2035 extern void regrename_optimize PARAMS ((void));
2038 extern void if_convert PARAMS ((int));
2041 extern void invert_br_probabilities PARAMS ((rtx));
2042 #endif /* ! GCC_RTL_H */