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* rtl.h (can_reverse_comparison_p): Remove.
[gcc.git] / gcc / rtl.h
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.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
21
22 #ifndef GCC_RTL_H
23 #define GCC_RTL_H
24
25 struct function;
26
27 #include "machmode.h"
28
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. */
33
34 /* Value used by some passes to "recognize" noop moves as valid
35 instructions. */
36 #define NOOP_MOVE_INSN_CODE INT_MAX
37
38 /* Register Transfer Language EXPRESSIONS CODES */
39
40 #define RTX_CODE enum rtx_code
41 enum rtx_code {
42
43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
44 #include "rtl.def" /* rtl expressions are documented here */
45 #undef DEF_RTL_EXPR
46
47 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
48 NUM_RTX_CODE.
49 Assumes default enum value assignment. */
50
51 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
53
54 extern const int rtx_length[];
55 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
56
57 extern const char * const rtx_name[];
58 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
59
60 extern const char * const rtx_format[];
61 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
62
63 extern const char rtx_class[];
64 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
65 \f
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. */
68 typedef struct
69 {
70 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
71 unsigned min_align: 8;
72 /* Flags: */
73 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
74 unsigned min_after_vec: 1; /* minimum address target label is
75 after the ADDR_DIFF_VEC. */
76 unsigned max_after_vec: 1; /* maximum address target label is
77 after the ADDR_DIFF_VEC. */
78 unsigned min_after_base: 1; /* minimum address target label is
79 after BASE. */
80 unsigned max_after_base: 1; /* maximum address target label is
81 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. */
84 unsigned : 2;
85 unsigned scale : 8;
86 } addr_diff_vec_flags;
87
88 /* Structure used to describe the attributes of a MEM. These are hashed
89 so MEMs that the same attributes share a data structure. This means
90 they cannot be modified in place. If any element is nonzero, it means
91 the value of the corresponding attribute is unknown. */
92 typedef struct
93 {
94 HOST_WIDE_INT alias; /* Memory alias set. */
95 tree decl; /* decl corresponding to MEM. */
96 rtx offset; /* Offset from start of DECL, as CONST_INT. */
97 rtx size; /* Size in bytes, as a CONST_INT. */
98 unsigned int align; /* Alignment of MEM in bytes. */
99 } mem_attrs;
100
101 /* Common union for an element of an rtx. */
102
103 typedef union rtunion_def
104 {
105 HOST_WIDE_INT rtwint;
106 int rtint;
107 unsigned int rtuint;
108 const char *rtstr;
109 rtx rtx;
110 rtvec rtvec;
111 enum machine_mode rttype;
112 addr_diff_vec_flags rt_addr_diff_vec_flags;
113 struct cselib_val_struct *rt_cselib;
114 struct bitmap_head_def *rtbit;
115 tree rttree;
116 struct basic_block_def *bb;
117 mem_attrs *rtmem;
118 } rtunion;
119
120 /* RTL expression ("rtx"). */
121
122 struct rtx_def
123 {
124 /* The kind of expression this is. */
125 ENUM_BITFIELD(rtx_code) code: 16;
126
127 /* The kind of value the expression has. */
128 ENUM_BITFIELD(machine_mode) mode : 8;
129
130 /* 1 in an INSN if it can alter flow of control
131 within this function.
132 LINK_COST_ZERO in an INSN_LIST. */
133 unsigned int jump : 1;
134 /* 1 in an INSN if it can call another function.
135 LINK_COST_FREE in an INSN_LIST. */
136 unsigned int call : 1;
137 /* 1 in a REG if value of this expression will never change during
138 the current function, even though it is not manifestly constant.
139 1 in a MEM if contents of memory are constant. This does not
140 necessarily mean that the value of this expression is constant.
141 1 in a SUBREG if it is from a promoted variable that is unsigned.
142 1 in a SYMBOL_REF if it addresses something in the per-function
143 constants pool.
144 1 in a CALL_INSN if it is a const call.
145 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
146 reorg until end of compilation; cleared before used. */
147 unsigned int unchanging : 1;
148 /* 1 in a MEM expression if contents of memory are volatile.
149 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
150 if it is deleted.
151 1 in a REG expression if corresponds to a variable declared by the user.
152 0 for an internally generated temporary.
153 In a SYMBOL_REF, this flag is used for machine-specific purposes.
154 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
155 unsigned int volatil : 1;
156 /* 1 in a MEM referring to a field of an aggregate.
157 0 if the MEM was a variable or the result of a * operator in C;
158 1 if it was the result of a . or -> operator (on a struct) in C.
159 1 in a REG if the register is used only in exit code a loop.
160 1 in a SUBREG expression if was generated from a variable with a
161 promoted mode.
162 1 in a CODE_LABEL if the label is used for nonlocal gotos
163 and must not be deleted even if its count is zero.
164 1 in a LABEL_REF if this is a reference to a label outside the
165 current loop.
166 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
167 together with the preceding insn. Valid only within sched.
168 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
169 from the target of a branch. Valid from reorg until end of compilation;
170 cleared before used.
171 1 in an INSN if this insn is dead code. Valid only during
172 dead-code elimination phase; cleared before use. */
173 unsigned int in_struct : 1;
174 /* 1 if this rtx is used. This is used for copying shared structure.
175 See `unshare_all_rtl'.
176 In a REG, this is not needed for that purpose, and used instead
177 in `leaf_renumber_regs_insn'.
178 In a SYMBOL_REF, means that emit_library_call
179 has used it as the function. */
180 unsigned int used : 1;
181 /* Nonzero if this rtx came from procedure integration.
182 In a REG, nonzero means this reg refers to the return value
183 of the current function.
184 1 in a SYMBOL_REF if the symbol is weak. */
185 unsigned integrated : 1;
186 /* 1 in an INSN or a SET if this rtx is related to the call frame,
187 either changing how we compute the frame address or saving and
188 restoring registers in the prologue and epilogue.
189 1 in a MEM if the MEM refers to a scalar, rather than a member of
190 an aggregate.
191 1 in a REG if the register is a pointer.
192 1 in a SYMBOL_REF if it addresses something in the per-function
193 constant string pool. */
194 unsigned frame_related : 1;
195
196 /* The first element of the operands of this rtx.
197 The number of operands and their types are controlled
198 by the `code' field, according to rtl.def. */
199 rtunion fld[1];
200 };
201
202 #define NULL_RTX (rtx) 0
203
204 /* Define macros to access the `code' field of the rtx. */
205
206 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
207 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
208
209 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
210 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
211
212 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
213 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
214 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
215
216 /* RTL vector. These appear inside RTX's when there is a need
217 for a variable number of things. The principle use is inside
218 PARALLEL expressions. */
219
220 struct rtvec_def {
221 int num_elem; /* number of elements */
222 rtx elem[1];
223 };
224
225 #define NULL_RTVEC (rtvec) 0
226
227 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
228 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
229
230 /* Predicate yielding nonzero iff X is an rtl for a register. */
231 #define REG_P(X) (GET_CODE (X) == REG)
232
233 /* Predicate yielding nonzero iff X is a label insn. */
234 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
235
236 /* Predicate yielding nonzero iff X is a jump insn. */
237 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
238
239 /* Predicate yielding nonzero iff X is a note insn. */
240 #define NOTE_P(X) (GET_CODE (X) == NOTE)
241
242 /* Predicate yielding nonzero iff X is a barrier insn. */
243 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
244
245 /* Predicate yielding nonzero iff X is a data for a jump table. */
246 #define JUMP_TABLE_DATA_P(INSN) \
247 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
248 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
249
250 /* 1 if X is a constant value that is an integer. */
251
252 #define CONSTANT_P(X) \
253 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
254 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
255 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
256 || GET_CODE (X) == CONSTANT_P_RTX)
257
258 /* General accessor macros for accessing the fields of an rtx. */
259
260 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
261 /* The bit with a star outside the statement expr and an & inside is
262 so that N can be evaluated only once. */
263 #define RTL_CHECK1(RTX, N, C1) __extension__ \
264 (*({ rtx _rtx = (RTX); int _n = (N); \
265 enum rtx_code _code = GET_CODE (_rtx); \
266 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
267 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
268 if (GET_RTX_FORMAT(_code)[_n] != C1) \
269 rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
270 &_rtx->fld[_n]; }))
271
272 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
273 (*({ rtx _rtx = (RTX); int _n = (N); \
274 enum rtx_code _code = GET_CODE (_rtx); \
275 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
276 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
277 if (GET_RTX_FORMAT(_code)[_n] != C1 \
278 && GET_RTX_FORMAT(_code)[_n] != C2) \
279 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
280 __FUNCTION__); \
281 &_rtx->fld[_n]; }))
282
283 #define RTL_CHECKC1(RTX, N, C) __extension__ \
284 (*({ rtx _rtx = (RTX); int _n = (N); \
285 if (GET_CODE (_rtx) != C) \
286 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
287 &_rtx->fld[_n]; }))
288
289 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
290 (*({ rtx _rtx = (RTX); int _n = (N); \
291 enum rtx_code _code = GET_CODE (_rtx); \
292 if (_code != C1 && _code != C2) \
293 rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
294 &_rtx->fld[_n]; }))
295
296 #define RTVEC_ELT(RTVEC, I) __extension__ \
297 (*({ rtvec _rtvec = (RTVEC); int _i = (I); \
298 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
299 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
300 __FUNCTION__); \
301 &_rtvec->elem[_i]; }))
302
303 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
304 const char *, int, const char *))
305 ATTRIBUTE_NORETURN;
306 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
307 const char *, int, const char *))
308 ATTRIBUTE_NORETURN;
309 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
310 const char *, int, const char *))
311 ATTRIBUTE_NORETURN;
312 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
313 const char *, int, const char *))
314 ATTRIBUTE_NORETURN;
315 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
316 const char *, int, const char *))
317 ATTRIBUTE_NORETURN;
318 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
319 const char *, int, const char *))
320 ATTRIBUTE_NORETURN;
321
322 #else /* not ENABLE_RTL_CHECKING */
323
324 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
325 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
326 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
327 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
328 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
329
330 #endif
331
332 #define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
333 #define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
334 #define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
335 #define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
336 #define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
337 #define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
338 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
339 #define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
340 #define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
341 #define XTMPL(RTX, N) (RTL_CHECK1(RTX, N, 'T').rtstr)
342
343 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
344 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
345
346 /* These are like XWINT, etc. except that they expect a '0' field instead
347 of the normal type code. */
348
349 #define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
350 #define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
351 #define X0UINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtuint)
352 #define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
353 #define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
354 #define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
355 #define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
356 #define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
357 #define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
358 #define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
359 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
360 #define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
361 #define X0MEMATTR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtmem)
362
363 #define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
364 #define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
365 #define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
366 #define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
367 #define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
368 #define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
369 #define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
370 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
371 #define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
372 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
373 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
374 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
375
376 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
377 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
378
379 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
380 \f
381 /* ACCESS MACROS for particular fields of insns. */
382
383 /* Determines whether X is an insn. */
384 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
385
386 /* Holds a unique number for each insn.
387 These are not necessarily sequentially increasing. */
388 #define INSN_UID(INSN) XINT(INSN, 0)
389
390 /* Chain insns together in sequence. */
391 #define PREV_INSN(INSN) XEXP(INSN, 1)
392 #define NEXT_INSN(INSN) XEXP(INSN, 2)
393
394 /* The body of an insn. */
395 #define PATTERN(INSN) XEXP(INSN, 3)
396
397 /* Code number of instruction, from when it was recognized.
398 -1 means this instruction has not been recognized yet. */
399 #define INSN_CODE(INSN) XINT(INSN, 4)
400
401 /* Set up in flow.c; empty before then.
402 Holds a chain of INSN_LIST rtx's whose first operands point at
403 previous insns with direct data-flow connections to this one.
404 That means that those insns set variables whose next use is in this insn.
405 They are always in the same basic block as this insn. */
406 #define LOG_LINKS(INSN) XEXP(INSN, 5)
407
408 /* 1 if insn has been deleted. */
409 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
410
411 /* 1 if insn is a call to a const or pure function. */
412 #define CONST_OR_PURE_CALL_P(INSN) ((INSN)->unchanging)
413
414 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
415 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
416
417 /* 1 if insn is a branch that should not unconditionally execute its
418 delay slots, i.e., it is an annulled branch. */
419 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
420
421 /* 1 if insn is a dead code. Valid only for dead-code elimination phase. */
422 #define INSN_DEAD_CODE_P(INSN) ((INSN)->in_struct)
423
424 /* 1 if insn is in a delay slot and is from the target of the branch. If
425 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
426 executed if the branch is taken. For annulled branches with this bit
427 clear, the insn should be executed only if the branch is not taken. */
428 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
429
430 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
431
432 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
433
434 /* Holds a list of notes on what this insn does to various REGs.
435 It is a chain of EXPR_LIST rtx's, where the second operand is the
436 chain pointer and the first operand is the REG being described.
437 The mode field of the EXPR_LIST contains not a real machine mode
438 but a value from enum reg_note. */
439
440 #define REG_NOTES(INSN) XEXP(INSN, 6)
441
442 /* Don't forget to change reg_note_name in rtl.c. */
443 enum reg_note
444 {
445 /* The value in REG dies in this insn (i.e., it is not needed past
446 this insn). If REG is set in this insn, the REG_DEAD note may,
447 but need not, be omitted. */
448 REG_DEAD = 1,
449
450 /* The REG is autoincremented or autodecremented. */
451 REG_INC,
452
453 /* Describes the insn as a whole; it says that the insn sets a register
454 to a constant value or to be equivalent to a memory address. If the
455 register is spilled to the stack then the constant value should be
456 substituted for it. The contents of the REG_EQUIV is the constant
457 value or memory address, which may be different from the source of
458 the SET although it has the same value. A REG_EQUIV note may also
459 appear on an insn which copies a register parameter to a pseudo-register,
460 if there is a memory address which could be used to hold that
461 pseudo-register throughout the function. */
462 REG_EQUIV,
463
464 /* Like REG_EQUIV except that the destination is only momentarily equal
465 to the specified rtx. Therefore, it cannot be used for substitution;
466 but it can be used for cse. */
467 REG_EQUAL,
468
469 /* The register set in this insn held 0 before the insn. The contents of
470 the note is the insn that stored the 0. If that insn is deleted or
471 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
472 is actually an INSN_LIST, not an EXPR_LIST. */
473 REG_WAS_0,
474
475 /* This insn copies the return-value of a library call out of the hard reg
476 for return values. This note is actually an INSN_LIST and it points to
477 the first insn involved in setting up arguments for the call. flow.c
478 uses this to delete the entire library call when its result is dead. */
479 REG_RETVAL,
480
481 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
482 and points at the one that has the REG_RETVAL. This note is also an
483 INSN_LIST. */
484 REG_LIBCALL,
485
486 /* The register is always nonnegative during the containing loop. This is
487 used in branches so that decrement and branch instructions terminating
488 on zero can be matched. There must be an insn pattern in the md file
489 named `decrement_and_branch_until_zero' or else this will never be added
490 to any instructions. */
491 REG_NONNEG,
492
493 /* There is no conflict *after this insn* between the register in the note
494 and the destination of this insn. */
495 REG_NO_CONFLICT,
496
497 /* Identifies a register set in this insn and never used. */
498 REG_UNUSED,
499
500 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
501 respectively. Normally, these are required to be consecutive insns, but
502 we permit putting a cc0-setting insn in the delay slot of a branch as
503 long as only one copy of the insn exists. In that case, these notes
504 point from one to the other to allow code generation to determine what
505 any require information and to properly update CC_STATUS. These notes
506 are INSN_LISTs. */
507 REG_CC_SETTER, REG_CC_USER,
508
509 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
510 CODE_LABEL contained in the REG_LABEL note is used by the insn.
511 This note is an INSN_LIST. */
512 REG_LABEL,
513
514 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
515 write-after-read and write-after-write dependencies respectively.
516 Data dependencies, which are the only type of LOG_LINK created by
517 flow, are represented by a 0 reg note kind. */
518 REG_DEP_ANTI, REG_DEP_OUTPUT,
519
520 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.
521 It has an integer value. For jumps, it is the probability that this is a
522 taken branch. For calls, it is the probability that this call won't
523 return. */
524 REG_BR_PROB,
525
526 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
527 the first insn after each CALL_INSN. It indicates how many times this
528 block was executed. */
529 REG_EXEC_COUNT,
530
531 /* Attached to a call insn; indicates that the call is malloc-like and
532 that the pointer returned cannot alias anything else. */
533 REG_NOALIAS,
534
535 /* Used to optimize rtl generated by dynamic stack allocations for targets
536 where SETJMP_VIA_SAVE_AREA is true. */
537 REG_SAVE_AREA,
538
539 /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
540 CONCAT of two integer value. First specifies the branch predictor
541 that added the note, second specifies the predicted hitrate of branch
542 in the same format as REG_BR_PROB note uses. */
543 REG_BR_PRED,
544
545 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
546 for DWARF to interpret what they imply. The attached rtx is used
547 instead of intuition. */
548 REG_FRAME_RELATED_EXPR,
549
550 /* Indicates that REG holds the exception context for the function.
551 This context is shared by inline functions, so the code to acquire
552 the real exception context is delayed until after inlining. */
553 REG_EH_CONTEXT,
554
555 /* Indicates what exception region an INSN belongs in. This is used to
556 indicate what region to which a call may throw. REGION 0 indicates
557 that a call cannot throw at all. REGION -1 indicates that it cannot
558 throw, nor will it execute a non-local goto. */
559 REG_EH_REGION,
560
561 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
562 REG_SAVE_NOTE,
563
564 /* Indicates that this insn (which is part of the prologue) computes
565 a value which might not be used later, and if so it's OK to delete
566 the insn. Normally, deleting any insn in the prologue is an error.
567 At present the parameter is unused and set to (const_int 0). */
568 REG_MAYBE_DEAD,
569
570 /* Indicates that a call does not return. */
571 REG_NORETURN,
572
573 /* Indicates that an indirect jump is a non-local goto instead of a
574 computed goto. */
575 REG_NON_LOCAL_GOTO,
576
577 /* This kind of note is generated at each to `setjmp',
578 and similar functions that can return twice. */
579 REG_SETJMP,
580
581 /* Indicate calls that always returns. */
582 REG_ALWAYS_RETURN
583 };
584
585 /* The base value for branch probability notes. */
586 #define REG_BR_PROB_BASE 10000
587
588 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
589 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
590 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
591
592 /* Names for REG_NOTE's in EXPR_LIST insn's. */
593
594 extern const char * const reg_note_name[];
595 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
596
597 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
598 USE and CLOBBER expressions.
599 USE expressions list the registers filled with arguments that
600 are passed to the function.
601 CLOBBER expressions document the registers explicitly clobbered
602 by this CALL_INSN.
603 Pseudo registers can not be mentioned in this list. */
604 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
605
606 /* The label-number of a code-label. The assembler label
607 is made from `L' and the label-number printed in decimal.
608 Label numbers are unique in a compilation. */
609 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
610
611 #define LINE_NUMBER NOTE
612
613 /* In a NOTE that is a line number, this is a string for the file name that the
614 line is in. We use the same field to record block numbers temporarily in
615 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
616 between ints and pointers if we use a different macro for the block number.)
617 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
618 information as an rtx in the field. */
619
620 #define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
621 #define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
622 #define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
623 #define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
624 #define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
625 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
626 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
627
628 /* In a NOTE that is a line number, this is the line number.
629 Other kinds of NOTEs are identified by negative numbers here. */
630 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
631
632 /* Nonzero if INSN is a note marking the beginning of a basic block. */
633 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
634 (GET_CODE (INSN) == NOTE \
635 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
636
637 /* Codes that appear in the NOTE_LINE_NUMBER field
638 for kinds of notes that are not line numbers.
639
640 Notice that we do not try to use zero here for any of
641 the special note codes because sometimes the source line
642 actually can be zero! This happens (for example) when we
643 are generating code for the per-translation-unit constructor
644 and destructor routines for some C++ translation unit.
645
646 If you should change any of the following values, or if you
647 should add a new value here, don't forget to change the
648 note_insn_name array in rtl.c. */
649
650 enum insn_note
651 {
652 /* Keep all of these numbers negative. Adjust as needed. */
653 NOTE_INSN_BIAS = -100,
654
655 /* This note is used to get rid of an insn
656 when it isn't safe to patch the insn out of the chain. */
657 NOTE_INSN_DELETED,
658
659 /* These are used to mark the beginning and end of a lexical block.
660 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
661 NOTE_INSN_BLOCK_BEG,
662 NOTE_INSN_BLOCK_END,
663
664 /* These mark the extremes of a loop. */
665 NOTE_INSN_LOOP_BEG,
666 NOTE_INSN_LOOP_END,
667
668 /* Generated at the place in a loop that `continue' jumps to. */
669 NOTE_INSN_LOOP_CONT,
670 /* Generated at the start of a duplicated exit test. */
671 NOTE_INSN_LOOP_VTOP,
672
673 /* This kind of note is generated at the end of the function body,
674 just before the return insn or return label. In an optimizing
675 compilation it is deleted by the first jump optimization, after
676 enabling that optimizer to determine whether control can fall
677 off the end of the function body without a return statement. */
678 NOTE_INSN_FUNCTION_END,
679
680 /* This marks the point immediately after the last prologue insn. */
681 NOTE_INSN_PROLOGUE_END,
682
683 /* This marks the point immediately prior to the first epilogue insn. */
684 NOTE_INSN_EPILOGUE_BEG,
685
686 /* Generated in place of user-declared labels when they are deleted. */
687 NOTE_INSN_DELETED_LABEL,
688
689 /* This note indicates the start of the real body of the function,
690 i.e. the point just after all of the parms have been moved into
691 their homes, etc. */
692 NOTE_INSN_FUNCTION_BEG,
693
694 /* These note where exception handling regions begin and end.
695 Uses NOTE_EH_HANDLER to identify the region in question. */
696 NOTE_INSN_EH_REGION_BEG,
697 NOTE_INSN_EH_REGION_END,
698
699 /* Generated whenever a duplicate line number note is output. For example,
700 one is output after the end of an inline function, in order to prevent
701 the line containing the inline call from being counted twice in gcov. */
702 NOTE_INSN_REPEATED_LINE_NUMBER,
703
704 /* Start/end of a live range region, where pseudos allocated on the stack
705 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
706 NOTE_INSN_RANGE_BEG,
707 NOTE_INSN_RANGE_END,
708
709 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
710 NOTE_INSN_LIVE,
711
712 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
713 NOTE_INSN_BASIC_BLOCK,
714
715 /* Record the expected value of a register at a location. Uses
716 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
717 NOTE_INSN_EXPECTED_VALUE,
718
719 NOTE_INSN_MAX
720 };
721
722 /* Names for NOTE insn's other than line numbers. */
723
724 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
725 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
726 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
727
728 /* The name of a label, in case it corresponds to an explicit label
729 in the input source code. */
730 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
731
732 /* In jump.c, each label contains a count of the number
733 of LABEL_REFs that point at it, so unused labels can be deleted. */
734 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
735
736 /* Associate a name with a CODE_LABEL. */
737 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
738
739 /* The original regno this ADDRESSOF was built for. */
740 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
741
742 /* The variable in the register we took the address of. */
743 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
744
745 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
746 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
747 be decremented and possibly the label can be deleted. */
748 #define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
749
750 /* Once basic blocks are found in flow.c,
751 each CODE_LABEL starts a chain that goes through
752 all the LABEL_REFs that jump to that label.
753 The chain eventually winds up at the CODE_LABEL: it is circular. */
754 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
755 \f
756 /* This is the field in the LABEL_REF through which the circular chain
757 of references to a particular label is linked.
758 This chain is set up in flow.c. */
759
760 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
761
762 /* Once basic blocks are found in flow.c,
763 Each LABEL_REF points to its containing instruction with this field. */
764
765 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
766
767 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
768 the number the register originally had; for a pseudo register turned into
769 a hard reg this will hold the old pseudo register number. */
770
771 #define REGNO(RTX) XCUINT(RTX, 0, REG)
772 #define ORIGINAL_REGNO(RTX) X0UINT(RTX, 1)
773
774 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
775 is the current function's return value. */
776
777 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
778
779 /* 1 in a REG rtx if it corresponds to a variable declared by the user. */
780 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
781
782 /* 1 in a REG rtx if the register is a pointer. */
783 #define REG_POINTER(RTX) ((RTX)->frame_related)
784
785 /* 1 if the given register REG corresponds to a hard register. */
786 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
787
788 /* 1 if the given register number REG_NO corresponds to a hard register. */
789 #define HARD_REGISTER_NUM_P(REG_NO) (REG_NO < FIRST_PSEUDO_REGISTER)
790
791 /* For a CONST_INT rtx, INTVAL extracts the integer. */
792
793 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
794
795 /* For a CONST_DOUBLE:
796 The usual two ints that hold the value.
797 For a DImode, that is all there are;
798 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
799 For a float, the number of ints varies,
800 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
801 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
802 #define CONST_DOUBLE_LOW(r) XCWINT (r, 2, CONST_DOUBLE)
803 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 3, CONST_DOUBLE)
804
805 /* Link for chain of all CONST_DOUBLEs in use in current function. */
806 #define CONST_DOUBLE_CHAIN(r) XCEXP (r, 1, CONST_DOUBLE)
807 /* The MEM which represents this CONST_DOUBLE's value in memory,
808 or const0_rtx if no MEM has been made for it yet,
809 or cc0_rtx if it is not on the chain. */
810 #define CONST_DOUBLE_MEM(r) XCEXP (r, 0, CONST_DOUBLE)
811
812 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
813 SUBREG_BYTE extracts the byte-number. */
814
815 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
816 #define SUBREG_BYTE(RTX) XCUINT(RTX, 1, SUBREG)
817
818 /* in rtlanal.c */
819 extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
820 enum machine_mode,
821 unsigned int,
822 enum machine_mode));
823 extern unsigned int subreg_regno PARAMS ((rtx));
824
825 /* 1 if the REG contained in SUBREG_REG is already known to be
826 sign- or zero-extended from the mode of the SUBREG to the mode of
827 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
828 extension.
829
830 When used as a LHS, is means that this extension must be done
831 when assigning to SUBREG_REG. */
832
833 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
834 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
835
836 /* Access various components of an ASM_OPERANDS rtx. */
837
838 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
839 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
840 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
841 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
842 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
843 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
844 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
845 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
846 XCVECEXP ((RTX), 4, (N), ASM_OPERANDS)
847 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
848 XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
849 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
850 GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
851 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
852 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
853
854 /* For a MEM rtx, 1 if it's a volatile reference.
855 Also in an ASM_OPERANDS rtx. */
856 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
857
858 /* For a MEM rtx, 1 if it refers to an aggregate, either to the
859 aggregate itself of to a field of the aggregate. If zero, RTX may
860 or may not be such a reference. */
861 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
862
863 /* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
864 not refer to a scalar.*/
865 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
866
867 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
868 RTX. Otherwise, vice versa. Use this macro only when you are
869 *sure* that you know that the MEM is in a structure, or is a
870 scalar. VAL is evaluated only once. */
871 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
872 if (VAL) \
873 { \
874 MEM_IN_STRUCT_P (RTX) = 1; \
875 MEM_SCALAR_P (RTX) = 0; \
876 } \
877 else \
878 { \
879 MEM_IN_STRUCT_P (RTX) = 0; \
880 MEM_SCALAR_P (RTX) = 1; \
881 } \
882 } while (0)
883
884 /* The memory attribute block. We provide access macros for each value
885 in the block and provide defaults if none specified. */
886 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
887
888 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
889 set, and may alias anything. Otherwise, the MEM can only alias
890 MEMs in the same alias set. This value is set in a
891 language-dependent manner in the front-end, and should not be
892 altered in the back-end. These set numbers are tested for zero,
893 and compared for equality; they have no other significance. In
894 some front-ends, these numbers may correspond in some way to types,
895 or other language-level entities, but they need not, and the
896 back-end makes no such assumptions. */
897 #define MEM_ALIAS_SET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->alias)
898
899 /* For a MEM rtx, the decl it is known to refer to, if it is known to
900 refer to part of a DECL. */
901 #define MEM_DECL(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->decl)
902
903 /* For a MEM rtx, the offset from the start of MEM_DECL, if known, as a
904 RTX that is always a CONST_INT. */
905 #define MEM_OFFSET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->offset)
906
907 /* For a MEM rtx, the size in bytes of the MEM, if known, as an RTX that
908 is always a CONST_INT. */
909 #define MEM_SIZE(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->size)
910
911 /* For a MEM rtx, the alignment in bytes. */
912 #define MEM_ALIGN(RTX) (MEM_ATTRS (RTX) == 0 ? 1 : MEM_ATTRS (RTX)->align)
913
914 /* Copy the attributes that apply to memory locations from RHS to LHS. */
915 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
916 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
917 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
918 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
919 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS), \
920 MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
921
922 /* For a LABEL_REF, 1 means that this reference is to a label outside the
923 loop containing the reference. */
924 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
925
926 /* For a LABEL_REF, 1 means it is for a nonlocal label. */
927 /* Likewise in an EXPR_LIST for a REG_LABEL note. */
928 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
929
930 /* For a CODE_LABEL, 1 means always consider this label to be needed. */
931 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
932
933 /* For a REG, 1 means the register is used only in an exit test of a loop. */
934 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
935
936 /* During sched, for an insn, 1 means that the insn must be scheduled together
937 with the preceding insn. */
938 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
939
940 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
941 cost of the dependence link. The cost of executing an instruction
942 may vary based on how the results are used. LINK_COST_ZERO is 1 when
943 the cost through the link varies and is unchanged (i.e., the link has
944 zero additional cost). LINK_COST_FREE is 1 when the cost through the
945 link is zero (i.e., the link makes the cost free). In other cases,
946 the adjustment to the cost is recomputed each time it is needed. */
947 #define LINK_COST_ZERO(X) ((X)->jump)
948 #define LINK_COST_FREE(X) ((X)->call)
949
950 /* For a SET rtx, SET_DEST is the place that is set
951 and SET_SRC is the value it is set to. */
952 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
953 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
954
955 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
956 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
957 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
958
959 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
960 conditionally executing the code on, COND_EXEC_CODE is the code
961 to execute if the condition is true. */
962 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
963 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
964
965 /* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
966 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
967
968 /* 1 in a SYMBOL_REF if it addresses this function's string constant pool. */
969 #define STRING_POOL_ADDRESS_P(RTX) ((RTX)->frame_related)
970
971 /* Flag in a SYMBOL_REF for machine-specific purposes. */
972 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
973
974 /* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
975 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
976
977 /* 1 means a SYMBOL_REF is weak. */
978 #define SYMBOL_REF_WEAK(RTX) ((RTX)->integrated)
979
980 /* Define a macro to look for REG_INC notes,
981 but save time on machines where they never exist. */
982
983 /* Don't continue this line--convex cc version 4.1 would lose. */
984 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
985 #define FIND_REG_INC_NOTE(insn, reg) \
986 (reg != NULL_RTX && REG_P ((rtx) (reg)) \
987 ? find_regno_note ((insn), REG_INC, REGNO ((rtx) (reg))) \
988 : find_reg_note ((insn), REG_INC, (reg)))
989 #else
990 #define FIND_REG_INC_NOTE(insn, reg) 0
991 #endif
992
993 /* Indicate whether the machine has any sort of auto increment addressing.
994 If not, we can avoid checking for REG_INC notes. */
995
996 /* Don't continue this line--convex cc version 4.1 would lose. */
997 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
998 #define AUTO_INC_DEC
999 #endif
1000
1001 #ifndef HAVE_PRE_INCREMENT
1002 #define HAVE_PRE_INCREMENT 0
1003 #endif
1004
1005 #ifndef HAVE_PRE_DECREMENT
1006 #define HAVE_PRE_DECREMENT 0
1007 #endif
1008
1009 #ifndef HAVE_POST_INCREMENT
1010 #define HAVE_POST_INCREMENT 0
1011 #endif
1012
1013 #ifndef HAVE_POST_DECREMENT
1014 #define HAVE_POST_DECREMENT 0
1015 #endif
1016
1017 #ifndef HAVE_POST_MODIFY_DISP
1018 #define HAVE_POST_MODIFY_DISP 0
1019 #endif
1020
1021 #ifndef HAVE_POST_MODIFY_REG
1022 #define HAVE_POST_MODIFY_REG 0
1023 #endif
1024
1025 #ifndef HAVE_PRE_MODIFY_DISP
1026 #define HAVE_PRE_MODIFY_DISP 0
1027 #endif
1028
1029 #ifndef HAVE_PRE_MODIFY_REG
1030 #define HAVE_PRE_MODIFY_REG 0
1031 #endif
1032
1033
1034 /* Some architectures do not have complete pre/post increment/decrement
1035 instruction sets, or only move some modes efficiently. These macros
1036 allow us to tune autoincrement generation. */
1037
1038 #ifndef USE_LOAD_POST_INCREMENT
1039 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1040 #endif
1041
1042 #ifndef USE_LOAD_POST_DECREMENT
1043 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1044 #endif
1045
1046 #ifndef USE_LOAD_PRE_INCREMENT
1047 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1048 #endif
1049
1050 #ifndef USE_LOAD_PRE_DECREMENT
1051 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1052 #endif
1053
1054 #ifndef USE_STORE_POST_INCREMENT
1055 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1056 #endif
1057
1058 #ifndef USE_STORE_POST_DECREMENT
1059 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1060 #endif
1061
1062 #ifndef USE_STORE_PRE_INCREMENT
1063 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1064 #endif
1065
1066 #ifndef USE_STORE_PRE_DECREMENT
1067 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1068 #endif
1069
1070
1071 /* Accessors for RANGE_INFO. */
1072 /* For RANGE_{START,END} notes return the RANGE_START note. */
1073 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
1074
1075 /* For RANGE_{START,END} notes return the RANGE_START note. */
1076 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
1077
1078 /* For RANGE_{START,END} notes, return the vector containing the registers used
1079 in the range. */
1080 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1081 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1082 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
1083
1084 /* For RANGE_{START,END} notes, the number of calls within the range. */
1085 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
1086
1087 /* For RANGE_{START,END} notes, the number of insns within the range. */
1088 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
1089
1090 /* For RANGE_{START,END} notes, a unique # to identify this range. */
1091 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
1092
1093 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
1094 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
1095
1096 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
1097 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
1098
1099 /* For RANGE_{START,END} notes, the loop depth the range is in. */
1100 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
1101
1102 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
1103 of the range. */
1104 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
1105
1106 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
1107 of the range. */
1108 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
1109
1110 /* For RANGE_START notes, the marker # of the start of the range. */
1111 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
1112
1113 /* For RANGE_START notes, the marker # of the end of the range. */
1114 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
1115
1116 /* Original pseudo register # for a live range note. */
1117 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
1118
1119 /* Pseudo register # original register is copied into or -1. */
1120 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
1121
1122 /* How many times a register in a live range note was referenced. */
1123 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
1124
1125 /* How many times a register in a live range note was set. */
1126 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
1127
1128 /* How many times a register in a live range note died. */
1129 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
1130
1131 /* Whether the original value is needed to be copied into the range register at
1132 the start of the range. */
1133 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
1134
1135 /* # of insns the register copy is live over. */
1136 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
1137
1138 /* # of calls the register copy is live over. */
1139 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1140
1141 /* DECL_NODE pointer of the declaration if the register is a user defined
1142 variable. */
1143 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1144
1145 /* BLOCK_NODE pointer to the block the variable is declared in if the
1146 register is a user defined variable. */
1147 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1148
1149 /* EXPR_LIST of the distinct ranges a variable is in. */
1150 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1151
1152 /* Block a variable is declared in. */
1153 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1154
1155 /* # of distinct ranges a variable is in. */
1156 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1157
1158 /* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1159 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1160
1161 /* For a NOTE_INSN_LIVE note, the original basic block number. */
1162 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1163
1164 /* Determine if the insn is a PHI node. */
1165 #define PHI_NODE_P(X) \
1166 (X && GET_CODE (X) == INSN \
1167 && GET_CODE (PATTERN (X)) == SET \
1168 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1169 \f
1170 /* Nonzero if we need to distinguish between the return value of this function
1171 and the return value of a function called by this function. This helps
1172 integrate.c.
1173 This is 1 until after the rtl generation pass. */
1174 extern int rtx_equal_function_value_matters;
1175
1176 /* Nonzero when we are generating CONCATs. */
1177 extern int generating_concat_p;
1178
1179 /* Generally useful functions. */
1180
1181 /* In expmed.c */
1182 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1183
1184 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1185
1186 /* In builtins.c */
1187 extern rtx expand_builtin_expect_jump PARAMS ((tree, rtx, rtx));
1188
1189 /* In explow.c */
1190 extern void set_stack_check_libfunc PARAMS ((rtx));
1191 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1192 enum machine_mode));
1193 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1194 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1195 extern void optimize_save_area_alloca PARAMS ((rtx));
1196
1197 /* In emit-rtl.c */
1198 extern rtx gen_rtx PARAMS ((enum rtx_code,
1199 enum machine_mode, ...));
1200 extern rtvec gen_rtvec PARAMS ((int, ...));
1201 extern rtx copy_insn_1 PARAMS ((rtx));
1202 extern rtx copy_insn PARAMS ((rtx));
1203
1204 /* In rtl.c */
1205 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1206 extern rtvec rtvec_alloc PARAMS ((int));
1207 extern rtx copy_rtx PARAMS ((rtx));
1208
1209 /* In emit-rtl.c */
1210 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1211
1212 /* In rtl.c */
1213 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1214 extern rtx shallow_copy_rtx PARAMS ((rtx));
1215 extern int rtx_equal_p PARAMS ((rtx, rtx));
1216
1217 /* In emit-rtl.c */
1218 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1219 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1220 extern rtx gen_label_rtx PARAMS ((void));
1221 extern int subreg_hard_regno PARAMS ((rtx, int));
1222 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1223 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1224
1225 /* In cse.c */
1226 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1227
1228 /* In emit-rtl.c */
1229 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1230 extern rtx gen_highpart_mode PARAMS ((enum machine_mode,
1231 enum machine_mode, rtx));
1232 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1233 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1234 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1235 enum machine_mode));
1236 extern rtx constant_subword PARAMS ((rtx, int,
1237 enum machine_mode));
1238
1239 /* In emit-rtl.c */
1240 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1241 enum machine_mode));
1242 extern int subreg_lowpart_p PARAMS ((rtx));
1243 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1244 enum machine_mode));
1245 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1246 enum machine_mode));
1247 extern rtx make_safe_from PARAMS ((rtx, rtx));
1248 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1249 extern rtx get_insns PARAMS ((void));
1250 extern const char *get_insn_name PARAMS ((int));
1251 extern rtx get_last_insn PARAMS ((void));
1252 extern rtx get_last_insn_anywhere PARAMS ((void));
1253 extern void start_sequence PARAMS ((void));
1254 extern void push_to_sequence PARAMS ((rtx));
1255 extern void end_sequence PARAMS ((void));
1256 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1257 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1258 extern rtx gen_sequence PARAMS ((void));
1259
1260 /* In varasm.c */
1261 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1262 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1263
1264 /* In varasm.c */
1265 extern rtx get_pool_constant PARAMS ((rtx));
1266 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1267 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1268 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1269 extern int get_pool_offset PARAMS ((rtx));
1270 extern rtx simplify_subtraction PARAMS ((rtx));
1271
1272 /* In function.c */
1273 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1274 HOST_WIDE_INT, int));
1275 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1276 HOST_WIDE_INT, int));
1277 extern rtx assign_temp PARAMS ((tree, int, int, int));
1278 /* In emit-rtl.c */
1279 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1280 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1281 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1282 extern rtx emit_barrier_before PARAMS ((rtx));
1283 extern rtx emit_label_before PARAMS ((rtx, rtx));
1284 extern rtx emit_note_before PARAMS ((int, rtx));
1285 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1286 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1287 extern rtx emit_barrier_after PARAMS ((rtx));
1288 extern rtx emit_label_after PARAMS ((rtx, rtx));
1289 extern rtx emit_note_after PARAMS ((int, rtx));
1290 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1291 extern rtx emit_insn PARAMS ((rtx));
1292 extern rtx emit_insns PARAMS ((rtx));
1293 extern rtx emit_insns_before PARAMS ((rtx, rtx));
1294 extern rtx emit_insns_after PARAMS ((rtx, rtx));
1295 extern rtx emit_jump_insn PARAMS ((rtx));
1296 extern rtx emit_call_insn PARAMS ((rtx));
1297 extern rtx emit_label PARAMS ((rtx));
1298 extern rtx emit_barrier PARAMS ((void));
1299 extern rtx emit_line_note PARAMS ((const char *, int));
1300 extern rtx emit_note PARAMS ((const char *, int));
1301 extern rtx emit_line_note_force PARAMS ((const char *, int));
1302 extern rtx make_insn_raw PARAMS ((rtx));
1303 extern rtx previous_insn PARAMS ((rtx));
1304 extern rtx next_insn PARAMS ((rtx));
1305 extern rtx prev_nonnote_insn PARAMS ((rtx));
1306 extern rtx next_nonnote_insn PARAMS ((rtx));
1307 extern rtx prev_real_insn PARAMS ((rtx));
1308 extern rtx next_real_insn PARAMS ((rtx));
1309 extern rtx prev_active_insn PARAMS ((rtx));
1310 extern rtx next_active_insn PARAMS ((rtx));
1311 extern int active_insn_p PARAMS ((rtx));
1312 extern rtx prev_label PARAMS ((rtx));
1313 extern rtx next_label PARAMS ((rtx));
1314 extern rtx next_cc0_user PARAMS ((rtx));
1315 extern rtx prev_cc0_setter PARAMS ((rtx));
1316
1317 /* In jump.c */
1318 extern rtx next_nondeleted_insn PARAMS ((rtx));
1319 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1320 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1321 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1322 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1323 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1324 extern void mark_jump_label PARAMS ((rtx, rtx, int));
1325 extern void cleanup_barriers PARAMS ((void));
1326
1327 /* In jump.c */
1328 extern void squeeze_notes PARAMS ((rtx *, rtx *));
1329 extern rtx delete_related_insns PARAMS ((rtx));
1330 extern void delete_jump PARAMS ((rtx));
1331 extern void delete_barrier PARAMS ((rtx));
1332 extern rtx get_label_before PARAMS ((rtx));
1333 extern rtx get_label_after PARAMS ((rtx));
1334 extern rtx follow_jumps PARAMS ((rtx));
1335
1336 /* In recog.c */
1337 extern rtx *find_constant_term_loc PARAMS ((rtx *));
1338
1339 /* In emit-rtl.c */
1340 extern rtx try_split PARAMS ((rtx, rtx, int));
1341 extern int split_branch_probability;
1342
1343 /* In unknown file */
1344 extern rtx split_insns PARAMS ((rtx, rtx));
1345
1346 /* In simplify-rtx.c */
1347 extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1348 enum machine_mode, rtx,
1349 enum machine_mode));
1350 extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1351 enum machine_mode, rtx,
1352 rtx));
1353 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1354 enum machine_mode,
1355 enum machine_mode, rtx, rtx,
1356 rtx));
1357 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1358 enum machine_mode, rtx,
1359 rtx));
1360 extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1361 enum machine_mode,
1362 rtx, rtx));
1363 extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1364 enum machine_mode, rtx,
1365 enum machine_mode));
1366 extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1367 enum machine_mode,
1368 enum machine_mode,
1369 rtx, rtx, rtx));
1370 extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
1371 enum machine_mode,
1372 enum machine_mode,
1373 rtx, rtx));
1374 extern rtx simplify_subreg PARAMS ((enum machine_mode,
1375 rtx,
1376 enum machine_mode,
1377 unsigned int));
1378 extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1379 rtx,
1380 enum machine_mode,
1381 unsigned int));
1382 extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
1383 extern rtx simplify_rtx PARAMS ((rtx));
1384 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1385
1386 /* In function.c */
1387 extern rtx gen_mem_addressof PARAMS ((rtx, tree));
1388
1389 /* In regclass.c */
1390 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1391 unsigned int));
1392
1393 /* In emit-rtl.c */
1394 extern void set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1395
1396 /* Functions in rtlanal.c */
1397
1398 /* Single set is implemented as macro for performance reasons. */
1399 #define single_set(I) (INSN_P (I) \
1400 ? (GET_CODE (PATTERN (I)) == SET \
1401 ? PATTERN (I) : single_set_1 (I)) \
1402 : NULL_RTX)
1403 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1404
1405 extern int rtx_addr_can_trap_p PARAMS ((rtx));
1406 extern int rtx_unstable_p PARAMS ((rtx));
1407 extern int rtx_varies_p PARAMS ((rtx, int));
1408 extern int rtx_addr_varies_p PARAMS ((rtx, int));
1409 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1410 extern rtx get_related_value PARAMS ((rtx));
1411 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1412 extern int count_occurrences PARAMS ((rtx, rtx, int));
1413 extern int reg_referenced_p PARAMS ((rtx, rtx));
1414 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1415 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1416 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1417 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1418 extern int commutative_operand_precedence PARAMS ((rtx));
1419 extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
1420 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1421 extern int no_labels_between_p PARAMS ((rtx, rtx));
1422 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1423 extern int modified_in_p PARAMS ((rtx, rtx));
1424 extern int insn_dependent_p PARAMS ((rtx, rtx));
1425 extern int reg_set_p PARAMS ((rtx, rtx));
1426 extern rtx single_set_2 PARAMS ((rtx, rtx));
1427 extern int multiple_sets PARAMS ((rtx));
1428 extern int set_noop_p PARAMS ((rtx));
1429 extern int noop_move_p PARAMS ((rtx));
1430 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1431 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1432 rtx, rtx *));
1433 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1434 extern rtx set_of PARAMS ((rtx, rtx));
1435 extern void note_stores PARAMS ((rtx,
1436 void (*) (rtx, rtx, void *),
1437 void *));
1438 extern void note_uses PARAMS ((rtx *,
1439 void (*) (rtx *, void *),
1440 void *));
1441 extern rtx reg_set_last PARAMS ((rtx, rtx));
1442 extern int dead_or_set_p PARAMS ((rtx, rtx));
1443 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1444 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1445 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1446 unsigned int));
1447 extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
1448 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1449 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1450 unsigned int));
1451 extern void remove_note PARAMS ((rtx, rtx));
1452 extern int side_effects_p PARAMS ((rtx));
1453 extern int volatile_refs_p PARAMS ((rtx));
1454 extern int volatile_insn_p PARAMS ((rtx));
1455 extern int may_trap_p PARAMS ((rtx));
1456 extern int inequality_comparisons_p PARAMS ((rtx));
1457 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1458 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1459 int));
1460 extern int computed_jump_p PARAMS ((rtx));
1461 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1462 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1463 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1464 extern int auto_inc_p PARAMS ((rtx));
1465 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1466 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1467 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1468 extern rtx find_first_parameter_load PARAMS ((rtx, rtx));
1469
1470 /* flow.c */
1471
1472 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1473 void init_EXPR_INSN_LIST_cache PARAMS ((void));
1474 void free_EXPR_LIST_list PARAMS ((rtx *));
1475 void free_INSN_LIST_list PARAMS ((rtx *));
1476 void free_EXPR_LIST_node PARAMS ((rtx));
1477 void free_INSN_LIST_node PARAMS ((rtx));
1478 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1479 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1480 void clear_log_links PARAMS ((rtx));
1481
1482 /* regclass.c */
1483
1484 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1485 Always at least 3, since the combiner could put that many togetherm
1486 and we want this to remain correct for all the remaining passes. */
1487
1488 extern int max_parallel;
1489
1490 /* Free up register info memory. */
1491 extern void free_reg_info PARAMS ((void));
1492
1493 /* recog.c */
1494 extern int asm_noperands PARAMS ((rtx));
1495 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1496 const char **,
1497 enum machine_mode *));
1498
1499 extern enum reg_class reg_preferred_class PARAMS ((int));
1500 extern enum reg_class reg_alternate_class PARAMS ((int));
1501
1502 extern rtx get_first_nonparm_insn PARAMS ((void));
1503
1504 extern void split_all_insns PARAMS ((int));
1505 extern void split_all_insns_noflow PARAMS ((void));
1506
1507 #define MAX_SAVED_CONST_INT 64
1508 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1509
1510 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1511 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1512 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1513 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1514 extern rtx const_true_rtx;
1515
1516 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1517
1518 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1519 same as VOIDmode. */
1520
1521 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1522
1523 /* Likewise, for the constants 1 and 2. */
1524
1525 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1526 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1527
1528 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1529 is used to represent the frame pointer. This is because the
1530 hard frame pointer and the automatic variables are separated by an amount
1531 that cannot be determined until after register allocation. We can assume
1532 that in this case ELIMINABLE_REGS will be defined, one action of which
1533 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1534 #ifndef HARD_FRAME_POINTER_REGNUM
1535 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1536 #endif
1537
1538 /* Index labels for global_rtl. */
1539 enum global_rtl_index
1540 {
1541 GR_PC,
1542 GR_CC0,
1543 GR_STACK_POINTER,
1544 GR_FRAME_POINTER,
1545 /* For register elimination to work properly these hard_frame_pointer_rtx,
1546 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1547 the same register. */
1548 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1549 GR_ARG_POINTER = GR_FRAME_POINTER,
1550 #endif
1551 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1552 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1553 #else
1554 GR_HARD_FRAME_POINTER,
1555 #endif
1556 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1557 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1558 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1559 #else
1560 GR_ARG_POINTER,
1561 #endif
1562 #endif
1563 GR_VIRTUAL_INCOMING_ARGS,
1564 GR_VIRTUAL_STACK_ARGS,
1565 GR_VIRTUAL_STACK_DYNAMIC,
1566 GR_VIRTUAL_OUTGOING_ARGS,
1567 GR_VIRTUAL_CFA,
1568
1569 GR_MAX
1570 };
1571
1572 /* Pointers to standard pieces of rtx are stored here. */
1573 extern rtx global_rtl[GR_MAX];
1574
1575 /* Standard pieces of rtx, to be substituted directly into things. */
1576 #define pc_rtx (global_rtl[GR_PC])
1577 #define cc0_rtx (global_rtl[GR_CC0])
1578
1579 /* All references to certain hard regs, except those created
1580 by allocating pseudo regs into them (when that's possible),
1581 go through these unique rtx objects. */
1582 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1583 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1584 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1585 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1586
1587 extern rtx pic_offset_table_rtx;
1588 extern rtx struct_value_rtx;
1589 extern rtx struct_value_incoming_rtx;
1590 extern rtx static_chain_rtx;
1591 extern rtx static_chain_incoming_rtx;
1592 extern rtx return_address_pointer_rtx;
1593
1594 /* Include the RTL generation functions. */
1595
1596 #ifndef NO_GENRTL_H
1597 #include "genrtl.h"
1598 #endif
1599
1600 /* There are some RTL codes that require special attention; the
1601 generation functions included above do the raw handling. If you
1602 add to this list, modify special_rtx in gengenrtl.c as well. You
1603 should also modify gen_rtx to use the special function. */
1604
1605 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1606 HOST_WIDE_INT, HOST_WIDE_INT));
1607 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1608 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1609 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1610 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1611 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1612
1613 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1614
1615 /* We need the cast here to ensure that we get the same result both with
1616 and without prototypes. */
1617 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1618
1619 /* Virtual registers are used during RTL generation to refer to locations into
1620 the stack frame when the actual location isn't known until RTL generation
1621 is complete. The routine instantiate_virtual_regs replaces these with
1622 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1623 a constant. */
1624
1625 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1626
1627 /* This points to the first word of the incoming arguments passed on the stack,
1628 either by the caller or by the callee when pretending it was passed by the
1629 caller. */
1630
1631 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1632
1633 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1634
1635 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1636 variable on the stack. Otherwise, it points to the first variable on
1637 the stack. */
1638
1639 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1640
1641 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1642
1643 /* This points to the location of dynamically-allocated memory on the stack
1644 immediately after the stack pointer has been adjusted by the amount
1645 desired. */
1646
1647 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1648
1649 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1650
1651 /* This points to the location in the stack at which outgoing arguments should
1652 be written when the stack is pre-pushed (arguments pushed using push
1653 insns always use sp). */
1654
1655 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1656
1657 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1658
1659 /* This points to the Canonical Frame Address of the function. This
1660 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1661 but is calculated relative to the arg pointer for simplicity; the
1662 frame pointer nor stack pointer are necessarily fixed relative to
1663 the CFA until after reload. */
1664
1665 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1666
1667 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1668
1669 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1670
1671 /* REGNUM never really appearing in the INSN stream. */
1672 #define INVALID_REGNUM (~(unsigned int)0)
1673
1674 extern rtx find_next_ref PARAMS ((rtx, rtx));
1675
1676 extern rtx output_constant_def PARAMS ((tree, int));
1677 extern rtx immed_real_const PARAMS ((tree));
1678
1679 /* Define a default value for STORE_FLAG_VALUE. */
1680
1681 #ifndef STORE_FLAG_VALUE
1682 #define STORE_FLAG_VALUE 1
1683 #endif
1684
1685 /* Nonzero after the second flow pass has completed.
1686 Set to 1 or 0 by toplev.c */
1687 extern int flow2_completed;
1688
1689 /* Nonzero after end of reload pass.
1690 Set to 1 or 0 by reload1.c. */
1691
1692 extern int reload_completed;
1693
1694 /* Set to 1 while reload_as_needed is operating.
1695 Required by some machines to handle any generated moves differently. */
1696
1697 extern int reload_in_progress;
1698
1699 /* If this is nonzero, we do not bother generating VOLATILE
1700 around volatile memory references, and we are willing to
1701 output indirect addresses. If cse is to follow, we reject
1702 indirect addresses so a useful potential cse is generated;
1703 if it is used only once, instruction combination will produce
1704 the same indirect address eventually. */
1705 extern int cse_not_expected;
1706
1707 /* Set to nonzero before life analysis to indicate that it is unsafe to
1708 generate any new pseudo registers. */
1709 extern int no_new_pseudos;
1710
1711 /* Translates rtx code to tree code, for those codes needed by
1712 REAL_ARITHMETIC. The function returns an int because the caller may not
1713 know what `enum tree_code' means. */
1714
1715 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1716
1717 /* In tree.c */
1718 struct obstack;
1719 extern void gcc_obstack_init PARAMS ((struct obstack *));
1720
1721 /* In cse.c */
1722 struct cse_basic_block_data;
1723
1724 /* Return the right cost to give to an operation
1725 to make the cost of the corresponding register-to-register instruction
1726 N times that of a fast register-to-register instruction. */
1727 #define COSTS_N_INSNS(N) ((N) * 4)
1728
1729 /* Maximum cost of a rtl expression. This value has the special meaning
1730 not to use an rtx with this cost under any circumstances. */
1731 #define MAX_COST INT_MAX
1732
1733 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1734 extern int address_cost PARAMS ((rtx, enum machine_mode));
1735 extern void delete_trivially_dead_insns PARAMS ((rtx, int, int));
1736 #ifdef BUFSIZ
1737 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1738 #endif
1739 extern void cse_end_of_basic_block PARAMS ((rtx,
1740 struct cse_basic_block_data *,
1741 int, int, int));
1742
1743 /* In jump.c */
1744 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1745 extern int condjump_p PARAMS ((rtx));
1746 extern int any_condjump_p PARAMS ((rtx));
1747 extern int any_uncondjump_p PARAMS ((rtx));
1748 extern int safe_to_remove_jump_p PARAMS ((rtx));
1749 extern rtx pc_set PARAMS ((rtx));
1750 extern rtx condjump_label PARAMS ((rtx));
1751 extern int simplejump_p PARAMS ((rtx));
1752 extern int returnjump_p PARAMS ((rtx));
1753 extern int onlyjump_p PARAMS ((rtx));
1754 extern int only_sets_cc0_p PARAMS ((rtx));
1755 extern int sets_cc0_p PARAMS ((rtx));
1756 extern int invert_jump_1 PARAMS ((rtx, rtx));
1757 extern int invert_jump PARAMS ((rtx, rtx, int));
1758 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1759 extern int true_regnum PARAMS ((rtx));
1760 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1761 extern int redirect_jump PARAMS ((rtx, rtx, int));
1762 extern void rebuild_jump_labels PARAMS ((rtx));
1763 extern void thread_jumps PARAMS ((rtx, int, int));
1764 extern int rtx_equal_for_thread_p PARAMS ((rtx, rtx, rtx));
1765 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1766 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1767 rtx, rtx, rtx));
1768 extern void delete_for_peephole PARAMS ((rtx, rtx));
1769 extern int condjump_in_parallel_p PARAMS ((rtx));
1770 extern void never_reached_warning PARAMS ((rtx));
1771 extern void purge_line_number_notes PARAMS ((rtx));
1772 extern void copy_loop_headers PARAMS ((rtx));
1773
1774 /* In emit-rtl.c. */
1775 extern int max_reg_num PARAMS ((void));
1776 extern int max_label_num PARAMS ((void));
1777 extern int get_first_label_num PARAMS ((void));
1778 extern void delete_insns_since PARAMS ((rtx));
1779 extern void mark_reg_pointer PARAMS ((rtx, int));
1780 extern void mark_user_reg PARAMS ((rtx));
1781 extern void reset_used_flags PARAMS ((rtx));
1782 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1783 extern void reorder_insns_nobb PARAMS ((rtx, rtx, rtx));
1784 extern int get_max_uid PARAMS ((void));
1785 extern int in_sequence_p PARAMS ((void));
1786 extern void force_next_line_note PARAMS ((void));
1787 extern void clear_emit_caches PARAMS ((void));
1788 extern void init_emit PARAMS ((void));
1789 extern void init_emit_once PARAMS ((int));
1790 extern void push_topmost_sequence PARAMS ((void));
1791 extern void pop_topmost_sequence PARAMS ((void));
1792 extern int subreg_realpart_p PARAMS ((rtx));
1793 extern void reverse_comparison PARAMS ((rtx));
1794 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1795 extern void set_new_first_and_last_label_num PARAMS ((int, int));
1796 extern void set_new_last_label_num PARAMS ((int));
1797 extern void unshare_all_rtl_again PARAMS ((rtx));
1798 extern void set_last_insn PARAMS ((rtx));
1799 extern void link_cc0_insns PARAMS ((rtx));
1800 extern void add_insn PARAMS ((rtx));
1801 extern void add_insn_before PARAMS ((rtx, rtx));
1802 extern void add_insn_after PARAMS ((rtx, rtx));
1803 extern void remove_insn PARAMS ((rtx));
1804 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1805 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1806 extern enum rtx_code classify_insn PARAMS ((rtx));
1807 extern rtx emit PARAMS ((rtx));
1808 /* Query and clear/ restore no_line_numbers. This is used by the
1809 switch / case handling in stmt.c to give proper line numbers in
1810 warnings about unreachable code. */
1811 int force_line_numbers PARAMS ((void));
1812 void restore_line_number_status PARAMS ((int old_value));
1813 extern void renumber_insns PARAMS ((FILE *));
1814 extern void remove_unnecessary_notes PARAMS ((void));
1815 extern rtx delete_insn PARAMS ((rtx));
1816 extern void delete_insn_chain PARAMS ((rtx, rtx));
1817
1818 /* In combine.c */
1819 extern int combine_instructions PARAMS ((rtx, unsigned int));
1820 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
1821 extern rtx remove_death PARAMS ((unsigned int, rtx));
1822 #ifdef BUFSIZ
1823 extern void dump_combine_stats PARAMS ((FILE *));
1824 extern void dump_combine_total_stats PARAMS ((FILE *));
1825 #endif
1826
1827 /* In sched.c. */
1828 #ifdef BUFSIZ
1829 extern void schedule_insns PARAMS ((FILE *));
1830 extern void schedule_ebbs PARAMS ((FILE *));
1831 #endif
1832 extern void fix_sched_param PARAMS ((const char *, const char *));
1833
1834 /* In print-rtl.c */
1835 extern const char *print_rtx_head;
1836 extern void debug_rtx PARAMS ((rtx));
1837 extern void debug_rtx_list PARAMS ((rtx, int));
1838 extern void debug_rtx_range PARAMS ((rtx, rtx));
1839 extern rtx debug_rtx_find PARAMS ((rtx, int));
1840 #ifdef BUFSIZ
1841 extern void print_rtl PARAMS ((FILE *, rtx));
1842 extern void print_simple_rtl PARAMS ((FILE *, rtx));
1843 extern int print_rtl_single PARAMS ((FILE *, rtx));
1844 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
1845 #endif
1846
1847 /* In loop.c */
1848 extern void init_loop PARAMS ((void));
1849 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
1850 #ifdef BUFSIZ
1851 extern void loop_optimize PARAMS ((rtx, FILE *, int));
1852 #endif
1853 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
1854
1855 /* In function.c */
1856 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
1857 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
1858 extern int prologue_epilogue_contains PARAMS ((rtx));
1859 extern int sibcall_epilogue_contains PARAMS ((rtx));
1860 extern void preserve_rtl_expr_result PARAMS ((rtx));
1861 extern void mark_temp_addr_taken PARAMS ((rtx));
1862 extern void update_temp_slot_address PARAMS ((rtx, rtx));
1863 extern void purge_addressof PARAMS ((rtx));
1864 extern void purge_hard_subreg_sets PARAMS ((rtx));
1865
1866 /* In stmt.c */
1867 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
1868 extern void expand_null_return PARAMS ((void));
1869 extern void emit_jump PARAMS ((rtx));
1870 extern int preserve_subexpressions_p PARAMS ((void));
1871
1872 /* In expr.c */
1873 extern void move_by_pieces PARAMS ((rtx, rtx,
1874 unsigned HOST_WIDE_INT,
1875 unsigned int));
1876
1877 /* In flow.c */
1878 extern void recompute_reg_usage PARAMS ((rtx, int));
1879 #ifdef BUFSIZ
1880 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
1881 extern void dump_flow_info PARAMS ((FILE *));
1882 #endif
1883
1884 /* In expmed.c */
1885 extern void init_expmed PARAMS ((void));
1886 extern void expand_inc PARAMS ((rtx, rtx));
1887 extern void expand_dec PARAMS ((rtx, rtx));
1888 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
1889 unsigned HOST_WIDE_INT, rtx,
1890 int, int));
1891
1892 /* In gcse.c */
1893 #ifdef BUFSIZ
1894 extern int gcse_main PARAMS ((rtx, FILE *));
1895 #endif
1896
1897 /* In global.c */
1898 extern void mark_elimination PARAMS ((int, int));
1899 #ifdef BUFSIZ
1900 extern int global_alloc PARAMS ((FILE *));
1901 extern void dump_global_regs PARAMS ((FILE *));
1902 #endif
1903 #ifdef HARD_CONST
1904 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
1905 #endif
1906 extern void build_insn_chain PARAMS ((rtx));
1907
1908 /* In regclass.c */
1909 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
1910 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
1911 extern void globalize_reg PARAMS ((int));
1912 extern void init_regs PARAMS ((void));
1913 extern void init_reg_sets PARAMS ((void));
1914 extern void regset_release_memory PARAMS ((void));
1915 extern void regclass_init PARAMS ((void));
1916 extern void regclass PARAMS ((rtx, int, FILE *));
1917 extern void reg_scan PARAMS ((rtx, unsigned int, int));
1918 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
1919 extern void fix_register PARAMS ((const char *, int, int));
1920
1921 extern void delete_null_pointer_checks PARAMS ((rtx));
1922
1923 /* In regmove.c */
1924 #ifdef BUFSIZ
1925 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
1926 #endif
1927 extern void combine_stack_adjustments PARAMS ((void));
1928
1929 /* In reorg.c */
1930 #ifdef BUFSIZ
1931 extern void dbr_schedule PARAMS ((rtx, FILE *));
1932 #endif
1933
1934 /* In local-alloc.c */
1935 #ifdef BUFSIZ
1936 extern void dump_local_alloc PARAMS ((FILE *));
1937 #endif
1938 extern int local_alloc PARAMS ((void));
1939 extern int function_invariant_p PARAMS ((rtx));
1940
1941 /* In profile.c */
1942 extern void init_branch_prob PARAMS ((const char *));
1943 extern void branch_prob PARAMS ((void));
1944 extern void end_branch_prob PARAMS ((void));
1945 extern void output_func_start_profiler PARAMS ((void));
1946
1947 /* In reg-stack.c */
1948 #ifdef BUFSIZ
1949 extern void reg_to_stack PARAMS ((rtx, FILE *));
1950 #endif
1951
1952 /* In fold-const.c */
1953 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1954 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1955 unsigned HOST_WIDE_INT *,
1956 HOST_WIDE_INT *));
1957 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1958 unsigned HOST_WIDE_INT *,
1959 HOST_WIDE_INT *));
1960 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
1961 HOST_WIDE_INT,
1962 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1963 unsigned HOST_WIDE_INT *,
1964 HOST_WIDE_INT *));
1965 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1966 HOST_WIDE_INT, unsigned int,
1967 unsigned HOST_WIDE_INT *,
1968 HOST_WIDE_INT *, int));
1969 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1970 HOST_WIDE_INT, unsigned int,
1971 unsigned HOST_WIDE_INT *,
1972 HOST_WIDE_INT *, int));
1973 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1974 HOST_WIDE_INT, unsigned int,
1975 unsigned HOST_WIDE_INT *,
1976 HOST_WIDE_INT *));
1977 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1978 HOST_WIDE_INT, unsigned int,
1979 unsigned HOST_WIDE_INT *,
1980 HOST_WIDE_INT *));
1981
1982 /* In calls.c */
1983 enum libcall_type
1984 {
1985 LCT_NORMAL = 0,
1986 LCT_CONST = 1,
1987 LCT_PURE = 2,
1988 LCT_CONST_MAKE_BLOCK = 3,
1989 LCT_PURE_MAKE_BLOCK = 4,
1990 LCT_NORETURN = 5,
1991 LCT_THROW = 6,
1992 LCT_ALWAYS_RETURN = 7,
1993 LCT_RETURNS_TWICE = 8
1994 };
1995
1996 extern void emit_library_call PARAMS ((rtx, enum libcall_type,
1997 enum machine_mode, int,
1998 ...));
1999 extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
2000 enum machine_mode, int,
2001 ...));
2002
2003 /* In unroll.c */
2004 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
2005
2006 /* In varasm.c */
2007 extern int in_data_section PARAMS ((void));
2008 extern void init_varasm_once PARAMS ((void));
2009
2010 /* In rtl.c */
2011 extern void init_rtl PARAMS ((void));
2012 extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
2013 void *));
2014 struct md_constant { char *name, *value; };
2015
2016 #ifdef BUFSIZ
2017 extern int read_skip_spaces PARAMS ((FILE *));
2018 extern rtx read_rtx PARAMS ((FILE *));
2019 #endif
2020
2021 extern const char *read_rtx_filename;
2022 extern int read_rtx_lineno;
2023
2024 /* Redefine abort to report an internal error w/o coredump, and
2025 reporting the location of the error in the source file. This logic
2026 is duplicated in rtl.h and tree.h because every file that needs the
2027 special abort includes one or both. toplev.h gets too few files,
2028 system.h gets too many. */
2029
2030 extern void fancy_abort PARAMS ((const char *, int, const char *))
2031 ATTRIBUTE_NORETURN;
2032 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
2033
2034 /* In alias.c */
2035 extern void clear_reg_alias_info PARAMS ((rtx));
2036 extern rtx canon_rtx PARAMS ((rtx));
2037 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2038 int (*)(rtx, int)));
2039 extern rtx get_addr PARAMS ((rtx));
2040 extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2041 rtx, int (*)(rtx, int)));
2042 extern int read_dependence PARAMS ((rtx, rtx));
2043 extern int anti_dependence PARAMS ((rtx, rtx));
2044 extern int output_dependence PARAMS ((rtx, rtx));
2045 extern void mark_constant_function PARAMS ((void));
2046 extern void init_alias_once PARAMS ((void));
2047 extern void init_alias_analysis PARAMS ((void));
2048 extern void end_alias_analysis PARAMS ((void));
2049 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
2050
2051 /* In sibcall.c */
2052 typedef enum {
2053 sibcall_use_normal = 1,
2054 sibcall_use_tail_recursion,
2055 sibcall_use_sibcall
2056 } sibcall_use_t;
2057
2058 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2059 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2060
2061 #ifdef STACK_REGS
2062 extern int stack_regs_mentioned PARAMS ((rtx insn));
2063 #endif
2064
2065 /* In toplev.c */
2066 extern rtx stack_limit_rtx;
2067
2068 /* In regrename.c */
2069 extern void regrename_optimize PARAMS ((void));
2070
2071 /* In ifcvt.c */
2072 extern void if_convert PARAMS ((int));
2073
2074 /* In predict.c */
2075 extern void invert_br_probabilities PARAMS ((rtx));
2076 extern bool expensive_function_p PARAMS ((int));
2077 #endif /* ! GCC_RTL_H */