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Replace "GNU CC" with "GCC"
[official-gcc.git] / gcc / rtl.h
blobfa5ef84963c01829505892f138f9ffc816a196b2
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, 2002, 2003 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 unsigned char rtx_length[NUM_RTX_CODE];
55 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
56
57 extern const char * const rtx_name[NUM_RTX_CODE];
58 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
59
60 extern const char * const rtx_format[NUM_RTX_CODE];
61 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
62
63 extern const char rtx_class[NUM_RTX_CODE];
64 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
65
66 extern const unsigned char rtx_next[NUM_RTX_CODE];
67 \f
68 /* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
69 relative to which the offsets are calculated, as explained in rtl.def. */
70 typedef struct
71 {
72 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
73 unsigned min_align: 8;
74 /* Flags: */
75 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
76 unsigned min_after_vec: 1; /* minimum address target label is
77 after the ADDR_DIFF_VEC. */
78 unsigned max_after_vec: 1; /* maximum address target label is
79 after the ADDR_DIFF_VEC. */
80 unsigned min_after_base: 1; /* minimum address target label is
81 after BASE. */
82 unsigned max_after_base: 1; /* maximum address target label is
83 after BASE. */
84 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
85 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
86 unsigned : 2;
87 unsigned scale : 8;
88 } addr_diff_vec_flags;
89
90 /* Structure used to describe the attributes of a MEM. These are hashed
91 so MEMs that the same attributes share a data structure. This means
92 they cannot be modified in place. If any element is nonzero, it means
93 the value of the corresponding attribute is unknown. */
94 /* ALIGN and SIZE are the alignment and size of the MEM itself,
95 while EXPR can describe a larger underlying object, which might have a
96 stricter alignment; OFFSET is the offset of the MEM within that object. */
97 typedef struct mem_attrs GTY(())
98 {
99 HOST_WIDE_INT alias; /* Memory alias set. */
100 tree expr; /* expr corresponding to MEM. */
101 rtx offset; /* Offset from start of DECL, as CONST_INT. */
102 rtx size; /* Size in bytes, as a CONST_INT. */
103 unsigned int align; /* Alignment of MEM in bits. */
104 } mem_attrs;
105
106 /* Structure used to describe the attributes of a REG in similar way as
107 mem_attrs does for MEM above. */
108
109 typedef struct reg_attrs GTY(())
110 {
111 tree decl; /* decl corresponding to REG. */
112 HOST_WIDE_INT offset; /* Offset from start of DECL. */
113 } reg_attrs;
114
115 /* Common union for an element of an rtx. */
116
117 union rtunion_def
118 {
119 HOST_WIDE_INT rtwint;
120 int rtint;
121 unsigned int rtuint;
122 const char *rtstr;
123 rtx rtx;
124 rtvec rtvec;
125 enum machine_mode rttype;
126 addr_diff_vec_flags rt_addr_diff_vec_flags;
127 struct cselib_val_struct *rt_cselib;
128 struct bitmap_head_def *rtbit;
129 tree rttree;
130 struct basic_block_def *bb;
131 mem_attrs *rtmem;
132 reg_attrs *rtreg;
133 };
134 typedef union rtunion_def rtunion;
135
136 /* RTL expression ("rtx"). */
137
138 struct rtx_def GTY((chain_next ("RTX_NEXT (&%h)"),
139 chain_prev ("RTX_PREV (&%h)")))
140 {
141 /* The kind of expression this is. */
142 ENUM_BITFIELD(rtx_code) code: 16;
143
144 /* The kind of value the expression has. */
145 ENUM_BITFIELD(machine_mode) mode : 8;
146
147 /* 1 in a MEM if we should keep the alias set for this mem unchanged
148 when we access a component.
149 1 in a CALL_INSN if it is a sibling call.
150 1 in a SET that is for a return.
151 In a CODE_LABEL, part of the two-bit alternate entry field. */
152 unsigned int jump : 1;
153 /* In a CODE_LABEL, part of the two-bit alternate entry field. */
154 unsigned int call : 1;
155 /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
156 1 in a SUBREG if it references an unsigned object whose mode has been
157 from a promoted to a wider mode.
158 1 in a SYMBOL_REF if it addresses something in the per-function
159 constants pool.
160 1 in a CALL_INSN, NOTE, or EXPR_LIST for a const or pure call.
161 1 in a JUMP_INSN, CALL_INSN, or INSN of an annulling branch. */
162 unsigned int unchanging : 1;
163 /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
164 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
165 if it has been deleted.
166 1 in a REG expression if corresponds to a variable declared by the user,
167 0 for an internally generated temporary.
168 1 in a SUBREG with a negative value.
169 1 in a LABEL_REF or in a REG_LABEL note for a non-local label.
170 In a SYMBOL_REF, this flag is used for machine-specific purposes. */
171 unsigned int volatil : 1;
172 /* 1 in a MEM referring to a field of an aggregate.
173 0 if the MEM was a variable or the result of a * operator in C;
174 1 if it was the result of a . or -> operator (on a struct) in C.
175 1 in a REG if the register is used only in exit code a loop.
176 1 in a SUBREG expression if was generated from a variable with a
177 promoted mode.
178 1 in a CODE_LABEL if the label is used for nonlocal gotos
179 and must not be deleted even if its count is zero.
180 1 in a LABEL_REF if this is a reference to a label outside the
181 current loop.
182 1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
183 together with the preceding insn. Valid only within sched.
184 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
185 from the target of a branch. Valid from reorg until end of compilation;
186 cleared before used.
187 1 in an INSN, JUMP_INSN or CALL_INSN or related rtx if this insn is
188 dead code. Valid only during dead-code elimination phase; cleared
189 before use. */
190 unsigned int in_struct : 1;
191 /* At the end of RTL generation, 1 if this rtx is used. This is used for
192 copying shared structure. See `unshare_all_rtl'.
193 In a REG, this is not needed for that purpose, and used instead
194 in `leaf_renumber_regs_insn'.
195 1 in a SYMBOL_REF, means that emit_library_call
196 has used it as the function. */
197 unsigned int used : 1;
198 /* Nonzero if this rtx came from procedure integration.
199 1 in a REG or PARALLEL means this rtx refers to the return value
200 of the current function.
201 1 in a SYMBOL_REF if the symbol is weak. */
202 unsigned integrated : 1;
203 /* 1 in an INSN or a SET if this rtx is related to the call frame,
204 either changing how we compute the frame address or saving and
205 restoring registers in the prologue and epilogue.
206 1 in a MEM if the MEM refers to a scalar, rather than a member of
207 an aggregate.
208 1 in a REG if the register is a pointer.
209 1 in a SYMBOL_REF if it addresses something in the per-function
210 constant string pool. */
211 unsigned frame_related : 1;
212
213 /* The first element of the operands of this rtx.
214 The number of operands and their types are controlled
215 by the `code' field, according to rtl.def. */
216 rtunion GTY ((special ("rtx_def"),
217 desc ("GET_CODE (&%0)"))) fld[1];
218 };
219
220 #define NULL_RTX (rtx) 0
221
222 /* The "next" and "previous" RTX, relative to this one. */
223
224 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL \
225 : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
226
227 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
228 */
229 #define RTX_PREV(X) ((GET_CODE (X) == INSN \
230 || GET_CODE (X) == CALL_INSN \
231 || GET_CODE (X) == JUMP_INSN \
232 || GET_CODE (X) == NOTE \
233 || GET_CODE (X) == BARRIER \
234 || GET_CODE (X) == CODE_LABEL) \
235 && PREV_INSN (X) != NULL \
236 && NEXT_INSN (PREV_INSN (X)) == X \
237 ? PREV_INSN (X) : NULL)
238
239 /* Define macros to access the `code' field of the rtx. */
240
241 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
242 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
243
244 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
245 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
246
247 /* RTL vector. These appear inside RTX's when there is a need
248 for a variable number of things. The principle use is inside
249 PARALLEL expressions. */
250
251 struct rtvec_def GTY(()) {
252 int num_elem; /* number of elements */
253 rtx GTY ((length ("%h.num_elem"))) elem[1];
254 };
255
256 #define NULL_RTVEC (rtvec) 0
257
258 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
259 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
260
261 /* Predicate yielding nonzero iff X is an rtl for a register. */
262 #define REG_P(X) (GET_CODE (X) == REG)
263
264 /* Predicate yielding nonzero iff X is a label insn. */
265 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
266
267 /* Predicate yielding nonzero iff X is a jump insn. */
268 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
269
270 /* Predicate yielding nonzero iff X is a note insn. */
271 #define NOTE_P(X) (GET_CODE (X) == NOTE)
272
273 /* Predicate yielding nonzero iff X is a barrier insn. */
274 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
275
276 /* Predicate yielding nonzero iff X is a data for a jump table. */
277 #define JUMP_TABLE_DATA_P(INSN) \
278 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
279 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
280
281 /* 1 if X is a constant value that is an integer. */
282
283 #define CONSTANT_P(X) \
284 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
285 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
286 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
287 || GET_CODE (X) == CONST_VECTOR \
288 || GET_CODE (X) == CONSTANT_P_RTX)
289
290 /* General accessor macros for accessing the fields of an rtx. */
291
292 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
293 /* The bit with a star outside the statement expr and an & inside is
294 so that N can be evaluated only once. */
295 #define RTL_CHECK1(RTX, N, C1) __extension__ \
296 (*({ rtx const _rtx = (RTX); const int _n = (N); \
297 const enum rtx_code _code = GET_CODE (_rtx); \
298 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
299 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
300 __FUNCTION__); \
301 if (GET_RTX_FORMAT(_code)[_n] != C1) \
302 rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
303 __FUNCTION__); \
304 &_rtx->fld[_n]; }))
305
306 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
307 (*({ rtx const _rtx = (RTX); const int _n = (N); \
308 const enum rtx_code _code = GET_CODE (_rtx); \
309 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
310 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
311 __FUNCTION__); \
312 if (GET_RTX_FORMAT(_code)[_n] != C1 \
313 && GET_RTX_FORMAT(_code)[_n] != C2) \
314 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
315 __FUNCTION__); \
316 &_rtx->fld[_n]; }))
317
318 #define RTL_CHECKC1(RTX, N, C) __extension__ \
319 (*({ rtx const _rtx = (RTX); const int _n = (N); \
320 if (GET_CODE (_rtx) != (C)) \
321 rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
322 __FUNCTION__); \
323 &_rtx->fld[_n]; }))
324
325 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
326 (*({ rtx const _rtx = (RTX); const int _n = (N); \
327 const enum rtx_code _code = GET_CODE (_rtx); \
328 if (_code != (C1) && _code != (C2)) \
329 rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__, \
330 __FUNCTION__); \
331 &_rtx->fld[_n]; }))
332
333 #define RTVEC_ELT(RTVEC, I) __extension__ \
334 (*({ rtvec const _rtvec = (RTVEC); const int _i = (I); \
335 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
336 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
337 __FUNCTION__); \
338 &_rtvec->elem[_i]; }))
339
340 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
341 const char *, int, const char *))
342 ATTRIBUTE_NORETURN;
343 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
344 const char *, int, const char *))
345 ATTRIBUTE_NORETURN;
346 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
347 const char *, int, const char *))
348 ATTRIBUTE_NORETURN;
349 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
350 const char *, int, const char *))
351 ATTRIBUTE_NORETURN;
352 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
353 const char *, int, const char *))
354 ATTRIBUTE_NORETURN;
355 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
356 const char *, int, const char *))
357 ATTRIBUTE_NORETURN;
358
359 #else /* not ENABLE_RTL_CHECKING */
360
361 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
362 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
363 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
364 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
365 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
366
367 #endif
368
369 /* General accessor macros for accessing the flags of an rtx. */
370
371 /* Access an individual rtx flag, with no checking of any kind. */
372 #define RTX_FLAG(RTX, FLAG) ((RTX)->FLAG)
373
374 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
375 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__ \
376 ({ rtx const _rtx = (RTX); \
377 if (GET_CODE(_rtx) != C1) \
378 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
379 __FUNCTION__); \
380 _rtx; })
381
382 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__ \
383 ({ rtx const _rtx = (RTX); \
384 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2) \
385 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
386 __FUNCTION__); \
387 _rtx; })
388
389 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__ \
390 ({ rtx const _rtx = (RTX); \
391 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
392 && GET_CODE(_rtx) != C3) \
393 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
394 __FUNCTION__); \
395 _rtx; })
396
397 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__ \
398 ({ rtx const _rtx = (RTX); \
399 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
400 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4) \
401 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
402 __FUNCTION__); \
403 _rtx; })
404
405 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__ \
406 ({ rtx const _rtx = (RTX); \
407 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
408 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
409 && GET_CODE(_rtx) != C5) \
410 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
411 __FUNCTION__); \
412 _rtx; })
413
414 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) \
415 __extension__ \
416 ({ rtx const _rtx = (RTX); \
417 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
418 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
419 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6) \
420 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
421 __FUNCTION__); \
422 _rtx; })
423
424 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) \
425 __extension__ \
426 ({ rtx const _rtx = (RTX); \
427 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
428 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
429 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
430 && GET_CODE(_rtx) != C7) \
431 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
432 __FUNCTION__); \
433 _rtx; })
434
435 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) \
436 __extension__ \
437 ({ rtx const _rtx = (RTX); \
438 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
439 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
440 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
441 && GET_CODE(_rtx) != C7 && GET_CODE(_rtx) != C8) \
442 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
443 __FUNCTION__); \
444 _rtx; })
445
446 extern void rtl_check_failed_flag PARAMS ((const char *, rtx, const char *,
447 int, const char *))
448 ATTRIBUTE_NORETURN
449 ;
450
451 #else /* not ENABLE_RTL_FLAG_CHECKING */
452
453 #define RTL_FLAG_CHECK1(NAME, RTX, C1) (RTX)
454 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) (RTX)
455 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) (RTX)
456 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) (RTX)
457 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) (RTX)
458 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) (RTX)
459 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) (RTX)
460 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) (RTX)
461 #endif
462
463 #define CLEAR_RTX_FLAGS(RTX) \
464 do { \
465 rtx const _rtx = (RTX); \
466 _rtx->call = 0; \
467 _rtx->frame_related = 0; \
468 _rtx->in_struct = 0; \
469 _rtx->integrated = 0; \
470 _rtx->jump = 0; \
471 _rtx->unchanging = 0; \
472 _rtx->used = 0; \
473 _rtx->volatil = 0; \
474 } while (0)
475
476 #define XWINT(RTX, N) (RTL_CHECK1 (RTX, N, 'w').rtwint)
477 #define XINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rtint)
478 #define XSTR(RTX, N) (RTL_CHECK2 (RTX, N, 's', 'S').rtstr)
479 #define XEXP(RTX, N) (RTL_CHECK2 (RTX, N, 'e', 'u').rtx)
480 #define XVEC(RTX, N) (RTL_CHECK2 (RTX, N, 'E', 'V').rtvec)
481 #define XMODE(RTX, N) (RTL_CHECK1 (RTX, N, 'M').rttype)
482 #define XBITMAP(RTX, N) (RTL_CHECK1 (RTX, N, 'b').rtbit)
483 #define XTREE(RTX, N) (RTL_CHECK1 (RTX, N, 't').rttree)
484 #define XBBDEF(RTX, N) (RTL_CHECK1 (RTX, N, 'B').bb)
485 #define XTMPL(RTX, N) (RTL_CHECK1 (RTX, N, 'T').rtstr)
486
487 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
488 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
489
490 /* These are like XWINT, etc. except that they expect a '0' field instead
491 of the normal type code. */
492
493 #define X0WINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtwint)
494 #define X0INT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtint)
495 #define X0UINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtuint)
496 #define X0STR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtstr)
497 #define X0EXP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtx)
498 #define X0VEC(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtvec)
499 #define X0MODE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttype)
500 #define X0BITMAP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtbit)
501 #define X0TREE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttree)
502 #define X0BBDEF(RTX, N) (RTL_CHECK1 (RTX, N, '0').bb)
503 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
504 #define X0CSELIB(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_cselib)
505 #define X0MEMATTR(RTX, N) (RTL_CHECKC1 (RTX, N, MEM).rtmem)
506 #define X0REGATTR(RTX, N) (RTL_CHECKC1 (RTX, N, REG).rtreg)
507
508 #define XCWINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtwint)
509 #define XCINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtint)
510 #define XCUINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtuint)
511 #define XCSTR(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtstr)
512 #define XCEXP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtx)
513 #define XCVEC(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtvec)
514 #define XCMODE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttype)
515 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtbit)
516 #define XCTREE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttree)
517 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).bb)
518 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_addr_diff_vec_flags)
519 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cselib)
520
521 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
522 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
523
524 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2 (RTX, N, C1, C2).rtx)
525 \f
526 /* ACCESS MACROS for particular fields of insns. */
527
528 /* Determines whether X is an insn. */
529 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
530
531 /* Holds a unique number for each insn.
532 These are not necessarily sequentially increasing. */
533 #define INSN_UID(INSN) XINT (INSN, 0)
534
535 /* Chain insns together in sequence. */
536 #define PREV_INSN(INSN) XEXP (INSN, 1)
537 #define NEXT_INSN(INSN) XEXP (INSN, 2)
538
539 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
540 #define INSN_SCOPE(INSN) XTREE (INSN, 4)
541 /* The body of an insn. */
542 #define PATTERN(INSN) XEXP (INSN, 5)
543
544 /* Code number of instruction, from when it was recognized.
545 -1 means this instruction has not been recognized yet. */
546 #define INSN_CODE(INSN) XINT (INSN, 6)
547
548 /* Set up in flow.c; empty before then.
549 Holds a chain of INSN_LIST rtx's whose first operands point at
550 previous insns with direct data-flow connections to this one.
551 That means that those insns set variables whose next use is in this insn.
552 They are always in the same basic block as this insn. */
553 #define LOG_LINKS(INSN) XEXP(INSN, 7)
554
555 #define RTX_INTEGRATED_P(RTX) \
556 (RTL_FLAG_CHECK8("RTX_INTEGRATED_P", (RTX), INSN, CALL_INSN, \
557 JUMP_INSN, INSN_LIST, BARRIER, CODE_LABEL, CONST, \
558 NOTE)->integrated)
559 #define RTX_UNCHANGING_P(RTX) \
560 (RTL_FLAG_CHECK3("RTX_UNCHANGING_P", (RTX), REG, MEM, CONCAT)->unchanging)
561 #define RTX_FRAME_RELATED_P(RTX) \
562 (RTL_FLAG_CHECK5("RTX_FRAME_RELATED_P", (RTX), INSN, CALL_INSN, \
563 JUMP_INSN, BARRIER, SET)->frame_related)
564
565 /* 1 if RTX is an insn that has been deleted. */
566 #define INSN_DELETED_P(RTX) \
567 (RTL_FLAG_CHECK6("INSN_DELETED_P", (RTX), INSN, CALL_INSN, JUMP_INSN, \
568 CODE_LABEL, BARRIER, NOTE)->volatil)
569
570 /* 1 if RTX is a call to a const or pure function. */
571 #define CONST_OR_PURE_CALL_P(RTX) \
572 (RTL_FLAG_CHECK3("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN, NOTE, \
573 EXPR_LIST)->unchanging)
574
575 /* 1 if RTX is a call_insn for a sibling call. */
576 #define SIBLING_CALL_P(RTX) \
577 (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
578
579 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch. */
580 #define INSN_ANNULLED_BRANCH_P(RTX) \
581 (RTL_FLAG_CHECK3("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN, CALL_INSN, INSN)->unchanging)
582
583 /* 1 if RTX is an insn that is dead code. Valid only for dead-code
584 elimination phase. */
585 #define INSN_DEAD_CODE_P(RTX) \
586 (RTL_FLAG_CHECK3("INSN_DEAD_CODE_P", (RTX), INSN, CALL_INSN, JUMP_INSN)->in_struct)
587
588 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
589 If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
590 executed if the branch is taken. For annulled branches with this bit
591 clear, the insn should be executed only if the branch is not taken. */
592 #define INSN_FROM_TARGET_P(RTX) \
593 (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
594
595 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
596
597 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
598
599 /* Holds a list of notes on what this insn does to various REGs.
600 It is a chain of EXPR_LIST rtx's, where the second operand is the
601 chain pointer and the first operand is the REG being described.
602 The mode field of the EXPR_LIST contains not a real machine mode
603 but a value from enum reg_note. */
604
605 #define REG_NOTES(INSN) XEXP(INSN, 8)
606
607 /* Don't forget to change reg_note_name in rtl.c. */
608 enum reg_note
609 {
610 /* The value in REG dies in this insn (i.e., it is not needed past
611 this insn). If REG is set in this insn, the REG_DEAD note may,
612 but need not, be omitted. */
613 REG_DEAD = 1,
614
615 /* The REG is autoincremented or autodecremented. */
616 REG_INC,
617
618 /* Describes the insn as a whole; it says that the insn sets a register
619 to a constant value or to be equivalent to a memory address. If the
620 register is spilled to the stack then the constant value should be
621 substituted for it. The contents of the REG_EQUIV is the constant
622 value or memory address, which may be different from the source of
623 the SET although it has the same value. A REG_EQUIV note may also
624 appear on an insn which copies a register parameter to a pseudo-register,
625 if there is a memory address which could be used to hold that
626 pseudo-register throughout the function. */
627 REG_EQUIV,
628
629 /* Like REG_EQUIV except that the destination is only momentarily equal
630 to the specified rtx. Therefore, it cannot be used for substitution;
631 but it can be used for cse. */
632 REG_EQUAL,
633
634 /* The register set in this insn held 0 before the insn. The contents of
635 the note is the insn that stored the 0. If that insn is deleted or
636 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
637 is actually an INSN_LIST, not an EXPR_LIST. */
638 REG_WAS_0,
639
640 /* This insn copies the return-value of a library call out of the hard reg
641 for return values. This note is actually an INSN_LIST and it points to
642 the first insn involved in setting up arguments for the call. flow.c
643 uses this to delete the entire library call when its result is dead. */
644 REG_RETVAL,
645
646 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
647 and points at the one that has the REG_RETVAL. This note is also an
648 INSN_LIST. */
649 REG_LIBCALL,
650
651 /* The register is always nonnegative during the containing loop. This is
652 used in branches so that decrement and branch instructions terminating
653 on zero can be matched. There must be an insn pattern in the md file
654 named `decrement_and_branch_until_zero' or else this will never be added
655 to any instructions. */
656 REG_NONNEG,
657
658 /* There is no conflict *after this insn* between the register in the note
659 and the destination of this insn. */
660 REG_NO_CONFLICT,
661
662 /* Identifies a register set in this insn and never used. */
663 REG_UNUSED,
664
665 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
666 respectively. Normally, these are required to be consecutive insns, but
667 we permit putting a cc0-setting insn in the delay slot of a branch as
668 long as only one copy of the insn exists. In that case, these notes
669 point from one to the other to allow code generation to determine what
670 any require information and to properly update CC_STATUS. These notes
671 are INSN_LISTs. */
672 REG_CC_SETTER, REG_CC_USER,
673
674 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
675 CODE_LABEL contained in the REG_LABEL note is used by the insn.
676 This note is an INSN_LIST. */
677 REG_LABEL,
678
679 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
680 write-after-read and write-after-write dependencies respectively.
681 Data dependencies, which are the only type of LOG_LINK created by
682 flow, are represented by a 0 reg note kind. */
683 REG_DEP_ANTI, REG_DEP_OUTPUT,
684
685 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.
686 It has an integer value. For jumps, it is the probability that this is a
687 taken branch. For calls, it is the probability that this call won't
688 return. */
689 REG_BR_PROB,
690
691 /* Attached to a call insn; indicates that the call is malloc-like and
692 that the pointer returned cannot alias anything else. */
693 REG_NOALIAS,
694
695 /* Used to optimize rtl generated by dynamic stack allocations for targets
696 where SETJMP_VIA_SAVE_AREA is true. */
697 REG_SAVE_AREA,
698
699 /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
700 CONCAT of two integer value. First specifies the branch predictor
701 that added the note, second specifies the predicted hitrate of branch
702 in the same format as REG_BR_PROB note uses. */
703 REG_BR_PRED,
704
705 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
706 for DWARF to interpret what they imply. The attached rtx is used
707 instead of intuition. */
708 REG_FRAME_RELATED_EXPR,
709
710 /* Indicates that REG holds the exception context for the function.
711 This context is shared by inline functions, so the code to acquire
712 the real exception context is delayed until after inlining. */
713 REG_EH_CONTEXT,
714
715 /* Indicates what exception region an INSN belongs in. This is used to
716 indicate what region to which a call may throw. REGION 0 indicates
717 that a call cannot throw at all. REGION -1 indicates that it cannot
718 throw, nor will it execute a non-local goto. */
719 REG_EH_REGION,
720
721 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
722 REG_SAVE_NOTE,
723
724 /* Indicates that this insn (which is part of the prologue) computes
725 a value which might not be used later, and if so it's OK to delete
726 the insn. Normally, deleting any insn in the prologue is an error.
727 At present the parameter is unused and set to (const_int 0). */
728 REG_MAYBE_DEAD,
729
730 /* Indicates that a call does not return. */
731 REG_NORETURN,
732
733 /* Indicates that an indirect jump is a non-local goto instead of a
734 computed goto. */
735 REG_NON_LOCAL_GOTO,
736
737 /* This kind of note is generated at each to `setjmp',
738 and similar functions that can return twice. */
739 REG_SETJMP,
740
741 /* Indicate calls that always returns. */
742 REG_ALWAYS_RETURN,
743
744 /* Indicate that the memory load references a vtable. The expression
745 is of the form (plus (symbol_ref vtable_sym) (const_int offset)). */
746 REG_VTABLE_REF
747 };
748
749 /* The base value for branch probability notes. */
750 #define REG_BR_PROB_BASE 10000
751
752 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
753 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
754 #define PUT_REG_NOTE_KIND(LINK, KIND) \
755 PUT_MODE (LINK, (enum machine_mode) (KIND))
756
757 /* Names for REG_NOTE's in EXPR_LIST insn's. */
758
759 extern const char * const reg_note_name[];
760 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
761
762 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
763 USE and CLOBBER expressions.
764 USE expressions list the registers filled with arguments that
765 are passed to the function.
766 CLOBBER expressions document the registers explicitly clobbered
767 by this CALL_INSN.
768 Pseudo registers can not be mentioned in this list. */
769 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 9)
770
771 /* The label-number of a code-label. The assembler label
772 is made from `L' and the label-number printed in decimal.
773 Label numbers are unique in a compilation. */
774 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
775
776 #define LINE_NUMBER NOTE
777
778 /* In a NOTE that is a line number, this is a string for the file name that the
779 line is in. We use the same field to record block numbers temporarily in
780 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
781 between ints and pointers if we use a different macro for the block number.)
782 */
783
784 #define NOTE_SOURCE_FILE(INSN) XCSTR (INSN, 4, NOTE)
785 #define NOTE_BLOCK(INSN) XCTREE (INSN, 4, NOTE)
786 #define NOTE_EH_HANDLER(INSN) XCINT (INSN, 4, NOTE)
787 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
788 #define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE)
789 #define NOTE_PREDICTION(INSN) XCINT (INSN, 4, NOTE)
790 #define NOTE_PRECONDITIONED(INSN) XCINT (INSN, 4, NOTE)
791
792 /* In a NOTE that is a line number, this is the line number.
793 Other kinds of NOTEs are identified by negative numbers here. */
794 #define NOTE_LINE_NUMBER(INSN) XCINT (INSN, 5, NOTE)
795
796 /* Nonzero if INSN is a note marking the beginning of a basic block. */
797 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
798 (GET_CODE (INSN) == NOTE \
799 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
800
801 /* Algorithm and flags for prediction. */
802 #define NOTE_PREDICTION_ALG(INSN) (XCINT(INSN, 4, NOTE)>>8)
803 #define NOTE_PREDICTION_FLAGS(INSN) (XCINT(INSN, 4, NOTE)&0xff)
804 #define NOTE_PREDICT(ALG,FLAGS) ((ALG<<8)+(FLAGS))
805
806 /* Codes that appear in the NOTE_LINE_NUMBER field
807 for kinds of notes that are not line numbers.
808
809 Notice that we do not try to use zero here for any of
810 the special note codes because sometimes the source line
811 actually can be zero! This happens (for example) when we
812 are generating code for the per-translation-unit constructor
813 and destructor routines for some C++ translation unit.
814
815 If you should change any of the following values, or if you
816 should add a new value here, don't forget to change the
817 note_insn_name array in rtl.c. */
818
819 enum insn_note
820 {
821 /* Keep all of these numbers negative. Adjust as needed. */
822 NOTE_INSN_BIAS = -100,
823
824 /* This note is used to get rid of an insn
825 when it isn't safe to patch the insn out of the chain. */
826 NOTE_INSN_DELETED,
827
828 /* These are used to mark the beginning and end of a lexical block.
829 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
830 NOTE_INSN_BLOCK_BEG,
831 NOTE_INSN_BLOCK_END,
832
833 /* These mark the extremes of a loop. */
834 NOTE_INSN_LOOP_BEG,
835 NOTE_INSN_LOOP_END,
836
837 /* Generated at the place in a loop that `continue' jumps to. */
838 NOTE_INSN_LOOP_CONT,
839 /* Generated at the start of a duplicated exit test. */
840 NOTE_INSN_LOOP_VTOP,
841
842 /* Generated at the end of a conditional at the top of the loop.
843 This is used to perform a lame form of loop rotation in lieu
844 of actually understanding the loop structure. The note is
845 discarded after rotation is complete. */
846 NOTE_INSN_LOOP_END_TOP_COND,
847
848 /* This kind of note is generated at the end of the function body,
849 just before the return insn or return label. In an optimizing
850 compilation it is deleted by the first jump optimization, after
851 enabling that optimizer to determine whether control can fall
852 off the end of the function body without a return statement. */
853 NOTE_INSN_FUNCTION_END,
854
855 /* This marks the point immediately after the last prologue insn. */
856 NOTE_INSN_PROLOGUE_END,
857
858 /* This marks the point immediately prior to the first epilogue insn. */
859 NOTE_INSN_EPILOGUE_BEG,
860
861 /* Generated in place of user-declared labels when they are deleted. */
862 NOTE_INSN_DELETED_LABEL,
863
864 /* This note indicates the start of the real body of the function,
865 i.e. the point just after all of the parms have been moved into
866 their homes, etc. */
867 NOTE_INSN_FUNCTION_BEG,
868
869 /* These note where exception handling regions begin and end.
870 Uses NOTE_EH_HANDLER to identify the region in question. */
871 NOTE_INSN_EH_REGION_BEG,
872 NOTE_INSN_EH_REGION_END,
873
874 /* Generated whenever a duplicate line number note is output. For example,
875 one is output after the end of an inline function, in order to prevent
876 the line containing the inline call from being counted twice in gcov. */
877 NOTE_INSN_REPEATED_LINE_NUMBER,
878
879 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
880 NOTE_INSN_BASIC_BLOCK,
881
882 /* Record the expected value of a register at a location. Uses
883 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
884 NOTE_INSN_EXPECTED_VALUE,
885
886 /* Record a prediction. Uses NOTE_PREDICTION. */
887 NOTE_INSN_PREDICTION,
888
889 NOTE_INSN_MAX
890 };
891
892 /* Names for NOTE insn's other than line numbers. */
893
894 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
895 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
896 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
897
898 /* The name of a label, in case it corresponds to an explicit label
899 in the input source code. */
900 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
901
902 /* In jump.c, each label contains a count of the number
903 of LABEL_REFs that point at it, so unused labels can be deleted. */
904 #define LABEL_NUSES(RTX) XCINT (RTX, 4, CODE_LABEL)
905
906 /* Labels carry a two-bit field composed of the ->jump and ->call
907 bits. This field indicates whether the label is an alternate
908 entry point, and if so, what kind. */
909 enum label_kind
910 {
911 LABEL_NORMAL = 0, /* ordinary label */
912 LABEL_STATIC_ENTRY, /* alternate entry point, not exported */
913 LABEL_GLOBAL_ENTRY, /* alternate entry point, exported */
914 LABEL_WEAK_ENTRY /* alternate entry point, exported as weak symbol */
915 };
916
917 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
918
919 /* Retrieve the kind of LABEL. */
920 #define LABEL_KIND(LABEL) __extension__ \
921 ({ rtx const _label = (LABEL); \
922 if (GET_CODE (_label) != CODE_LABEL) \
923 rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__, \
924 __FUNCTION__); \
925 (enum label_kind) ((_label->jump << 1) | _label->call); })
926
927 /* Set the kind of LABEL. */
928 #define SET_LABEL_KIND(LABEL, KIND) do { \
929 rtx _label = (LABEL); \
930 unsigned int _kind = (KIND); \
931 if (GET_CODE (_label) != CODE_LABEL) \
932 rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
933 __FUNCTION__); \
934 _label->jump = ((_kind >> 1) & 1); \
935 _label->call = (_kind & 1); \
936 } while (0)
937
938 #else
939
940 /* Retrieve the kind of LABEL. */
941 #define LABEL_KIND(LABEL) \
942 ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
943
944 /* Set the kind of LABEL. */
945 #define SET_LABEL_KIND(LABEL, KIND) do { \
946 rtx _label = (LABEL); \
947 unsigned int _kind = (KIND); \
948 _label->jump = ((_kind >> 1) & 1); \
949 _label->call = (_kind & 1); \
950 } while (0)
951
952 #endif /* rtl flag checking */
953
954 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
955
956 /* The original regno this ADDRESSOF was built for. */
957 #define ADDRESSOF_REGNO(RTX) XCUINT (RTX, 1, ADDRESSOF)
958
959 /* The variable in the register we took the address of. */
960 #define ADDRESSOF_DECL(RTX) XCTREE (RTX, 2, ADDRESSOF)
961
962 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
963 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
964 be decremented and possibly the label can be deleted. */
965 #define JUMP_LABEL(INSN) XCEXP (INSN, 9, JUMP_INSN)
966
967 /* Once basic blocks are found in flow.c,
968 each CODE_LABEL starts a chain that goes through
969 all the LABEL_REFs that jump to that label.
970 The chain eventually winds up at the CODE_LABEL: it is circular. */
971 #define LABEL_REFS(LABEL) XCEXP (LABEL, 5, CODE_LABEL)
972 \f
973 /* This is the field in the LABEL_REF through which the circular chain
974 of references to a particular label is linked.
975 This chain is set up in flow.c. */
976
977 #define LABEL_NEXTREF(REF) XCEXP (REF, 1, LABEL_REF)
978
979 /* Once basic blocks are found in flow.c,
980 Each LABEL_REF points to its containing instruction with this field. */
981
982 #define CONTAINING_INSN(RTX) XCEXP (RTX, 2, LABEL_REF)
983
984 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
985 the number the register originally had; for a pseudo register turned into
986 a hard reg this will hold the old pseudo register number. */
987
988 #define REGNO(RTX) XCUINT (RTX, 0, REG)
989 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
990
991 /* 1 if RTX is a reg or parallel that is the current function's return
992 value. */
993 #define REG_FUNCTION_VALUE_P(RTX) \
994 (RTL_FLAG_CHECK2("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->integrated)
995
996 /* 1 if RTX is a reg that corresponds to a variable declared by the user. */
997 #define REG_USERVAR_P(RTX) \
998 (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
999
1000 /* 1 if RTX is a reg that holds a pointer value. */
1001 #define REG_POINTER(RTX) \
1002 (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
1003
1004 /* 1 if the given register REG corresponds to a hard register. */
1005 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1006
1007 /* 1 if the given register number REG_NO corresponds to a hard register. */
1008 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1009
1010 /* For a CONST_INT rtx, INTVAL extracts the integer. */
1011
1012 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
1013
1014 /* For a CONST_DOUBLE:
1015 For a DImode, there are two integers CONST_DOUBLE_LOW is the
1016 low-order word and ..._HIGH the high-order.
1017 For a float, there is a REAL_VALUE_TYPE structure, and
1018 CONST_DOUBLE_REAL_VALUE(r) is a pointer to it. */
1019 #define CONST_DOUBLE_LOW(r) XCWINT (r, 0, CONST_DOUBLE)
1020 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 1, CONST_DOUBLE)
1021 #define CONST_DOUBLE_REAL_VALUE(r) ((struct real_value *)&CONST_DOUBLE_LOW(r))
1022
1023 /* For a CONST_VECTOR, return element #n. */
1024 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1025
1026 /* For a CONST_VECTOR, return the number of elements in a vector. */
1027 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1028
1029 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1030 SUBREG_BYTE extracts the byte-number. */
1031
1032 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1033 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1034
1035 /* in rtlanal.c */
1036 extern unsigned int subreg_lsb PARAMS ((rtx));
1037 extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
1038 enum machine_mode,
1039 unsigned int,
1040 enum machine_mode));
1041 extern unsigned int subreg_regno PARAMS ((rtx));
1042
1043 /* 1 if RTX is a subreg containing a reg that is already known to be
1044 sign- or zero-extended from the mode of the subreg to the mode of
1045 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1046 extension.
1047
1048 When used as a LHS, is means that this extension must be done
1049 when assigning to SUBREG_REG. */
1050
1051 #define SUBREG_PROMOTED_VAR_P(RTX) \
1052 (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1053
1054 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL) \
1055 do { \
1056 rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
1057 if ((VAL) < 0) \
1058 _rtx->volatil = 1; \
1059 else { \
1060 _rtx->volatil = 0; \
1061 _rtx->unchanging = (VAL); \
1062 } \
1063 } while (0)
1064 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1065 ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1066 ? -1 : (RTX)->unchanging)
1067
1068 /* Access various components of an ASM_OPERANDS rtx. */
1069
1070 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1071 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1072 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1073 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1074 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1075 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1076 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1077 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1078 XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1079 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1080 XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1081 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
1082 GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1083 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR (RTX, 5, ASM_OPERANDS)
1084 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT (RTX, 6, ASM_OPERANDS)
1085
1086 /* 1 if RTX is a mem and we should keep the alias set for this mem
1087 unchanged when we access a component. Set to 1, or example, when we
1088 are already in a non-addressable component of an aggregate. */
1089 #define MEM_KEEP_ALIAS_SET_P(RTX) \
1090 (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1091
1092 /* 1 if RTX is a mem or asm_operand for a volatile reference. */
1093 #define MEM_VOLATILE_P(RTX) \
1094 (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS, \
1095 ASM_INPUT)->volatil)
1096
1097 /* 1 if RTX is a mem that refers to an aggregate, either to the
1098 aggregate itself of to a field of the aggregate. If zero, RTX may
1099 or may not be such a reference. */
1100 #define MEM_IN_STRUCT_P(RTX) \
1101 (RTL_FLAG_CHECK1("MEM_IN_STRUCT_P", (RTX), MEM)->in_struct)
1102
1103 /* 1 if RTX is a mem that refers to a scalar. If zero, RTX may or may
1104 not refer to a scalar. */
1105 #define MEM_SCALAR_P(RTX) \
1106 (RTL_FLAG_CHECK1("MEM_SCALAR_P", (RTX), MEM)->frame_related)
1107
1108 /* If VAL is nonzero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
1109 RTX. Otherwise, vice versa. Use this macro only when you are
1110 *sure* that you know that the MEM is in a structure, or is a
1111 scalar. VAL is evaluated only once. */
1112 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
1113 do { \
1114 if (VAL) \
1115 { \
1116 MEM_IN_STRUCT_P (RTX) = 1; \
1117 MEM_SCALAR_P (RTX) = 0; \
1118 } \
1119 else \
1120 { \
1121 MEM_IN_STRUCT_P (RTX) = 0; \
1122 MEM_SCALAR_P (RTX) = 1; \
1123 } \
1124 } while (0)
1125
1126 /* The memory attribute block. We provide access macros for each value
1127 in the block and provide defaults if none specified. */
1128 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1129
1130 /* The register attribute block. We provide access macros for each value
1131 in the block and provide defaults if none specified. */
1132 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1133
1134 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
1135 set, and may alias anything. Otherwise, the MEM can only alias
1136 MEMs in the same alias set. This value is set in a
1137 language-dependent manner in the front-end, and should not be
1138 altered in the back-end. These set numbers are tested for zero,
1139 and compared for equality; they have no other significance. In
1140 some front-ends, these numbers may correspond in some way to types,
1141 or other language-level entities, but they need not, and the
1142 back-end makes no such assumptions. */
1143 #define MEM_ALIAS_SET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->alias)
1144
1145 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1146 refer to part of a DECL. It may also be a COMPONENT_REF. */
1147 #define MEM_EXPR(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->expr)
1148
1149 /* For a MEM rtx, the offset from the start of MEM_EXPR, if known, as a
1150 RTX that is always a CONST_INT. */
1151 #define MEM_OFFSET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->offset)
1152
1153 /* For a MEM rtx, the size in bytes of the MEM, if known, as an RTX that
1154 is always a CONST_INT. */
1155 #define MEM_SIZE(RTX) \
1156 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->size \
1157 : GET_MODE (RTX) != BLKmode ? GEN_INT (GET_MODE_SIZE (GET_MODE (RTX))) \
1158 : 0)
1159
1160 /* For a MEM rtx, the alignment in bits. We can use the alignment of the
1161 mode as a default when STRICT_ALIGNMENT, but not if not. */
1162 #define MEM_ALIGN(RTX) \
1163 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->align \
1164 : (STRICT_ALIGNMENT && GET_MODE (RTX) != BLKmode \
1165 ? GET_MODE_ALIGNMENT (GET_MODE (RTX)) : BITS_PER_UNIT))
1166
1167 /* For a REG rtx, the decl it is known to refer to, if it is known to
1168 refer to part of a DECL. */
1169 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1170
1171 /* For a MEM rtx, the offset from the start of MEM_DECL, if known, as a
1172 RTX that is always a CONST_INT. */
1173 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1174
1175 /* Copy the attributes that apply to memory locations from RHS to LHS. */
1176 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
1177 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
1178 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
1179 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
1180 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS), \
1181 MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS), \
1182 MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1183
1184 /* 1 if RTX is a label_ref to a label outside the loop containing the
1185 reference. */
1186 #define LABEL_OUTSIDE_LOOP_P(RTX) \
1187 (RTL_FLAG_CHECK1("LABEL_OUTSIDE_LOOP_P", (RTX), LABEL_REF)->in_struct)
1188
1189 /* 1 if RTX is a label_ref for a nonlocal label. */
1190 /* Likewise in an expr_list for a reg_label note. */
1191 #define LABEL_REF_NONLOCAL_P(RTX) \
1192 (RTL_FLAG_CHECK2("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF, \
1193 REG_LABEL)->volatil)
1194
1195 /* 1 if RTX is a code_label that should always be considered to be needed. */
1196 #define LABEL_PRESERVE_P(RTX) \
1197 (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1198
1199 /* 1 if RTX is a reg that is used only in an exit test of a loop. */
1200 #define REG_LOOP_TEST_P(RTX) \
1201 (RTL_FLAG_CHECK1("REG_LOOP_TEST_P", (RTX), REG)->in_struct)
1202
1203 /* During sched, 1 if RTX is an insn that must be scheduled together
1204 with the preceding insn. */
1205 #define SCHED_GROUP_P(RTX) \
1206 (RTL_FLAG_CHECK3("SCHED_GROUP_P", (RTX), INSN, JUMP_INSN, CALL_INSN \
1207 )->in_struct)
1208
1209 /* For a SET rtx, SET_DEST is the place that is set
1210 and SET_SRC is the value it is set to. */
1211 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1212 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1213 #define SET_IS_RETURN_P(RTX) \
1214 (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1215
1216 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
1217 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1218 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1219
1220 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1221 conditionally executing the code on, COND_EXEC_CODE is the code
1222 to execute if the condition is true. */
1223 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1224 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1225
1226 /* 1 if RTX is a symbol_ref that addresses this function's constants pool. */
1227 #define CONSTANT_POOL_ADDRESS_P(RTX) \
1228 (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1229
1230 /* 1 if RTX is a symbol_ref that addresses this function's string constant
1231 pool */
1232 #define STRING_POOL_ADDRESS_P(RTX) \
1233 (RTL_FLAG_CHECK1("STRING_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->frame_related)
1234
1235 /* Used if RTX is a symbol_ref, for machine-specific purposes. */
1236 #define SYMBOL_REF_FLAG(RTX) \
1237 (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1238
1239 /* 1 if RTX is a symbol_ref that has been the library function in
1240 emit_library_call. */
1241 #define SYMBOL_REF_USED(RTX) \
1242 (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1243
1244 /* 1 if RTX is a symbol_ref for a weak symbol. */
1245 #define SYMBOL_REF_WEAK(RTX) \
1246 (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->integrated)
1247
1248 /* The tree decl associated with the symbol, or null. */
1249 #define SYMBOL_REF_DECL(RTX) X0TREE ((RTX), 2)
1250
1251 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1252 information derivable from the tree decl associated with this symbol.
1253 Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1254 decl. In some cases this is a bug. But beyond that, it's nice to cache
1255 this information to avoid recomputing it. Finally, this allows space for
1256 the target to store more than one bit of information, as with
1257 SYMBOL_REF_FLAG. */
1258 #define SYMBOL_REF_FLAGS(RTX) X0INT ((RTX), 1)
1259
1260 /* These flags are common enough to be defined for all targets. They
1261 are computed by the default version of targetm.encode_section_info. */
1262
1263 /* Set if this symbol is a function. */
1264 #define SYMBOL_FLAG_FUNCTION (1 << 0)
1265 #define SYMBOL_REF_FUNCTION_P(RTX) \
1266 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1267 /* Set if targetm.binds_local_p is true. */
1268 #define SYMBOL_FLAG_LOCAL (1 << 1)
1269 #define SYMBOL_REF_LOCAL_P(RTX) \
1270 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1271 /* Set if targetm.in_small_data_p is true. */
1272 #define SYMBOL_FLAG_SMALL (1 << 2)
1273 #define SYMBOL_REF_SMALL_P(RTX) \
1274 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1275 /* The three-bit field at [5:3] is true for TLS variables; use
1276 SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model. */
1277 #define SYMBOL_FLAG_TLS_SHIFT 3
1278 #define SYMBOL_REF_TLS_MODEL(RTX) \
1279 ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 3))
1280 /* Set if this symbol is not defined in this translation unit. */
1281 #define SYMBOL_FLAG_EXTERNAL (1 << 6)
1282 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1283 ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1284
1285 /* Subsequent bits are available for the target to use. */
1286 #define SYMBOL_FLAG_MACH_DEP (1 << 7)
1287
1288 /* Define a macro to look for REG_INC notes,
1289 but save time on machines where they never exist. */
1290
1291 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1292 #define FIND_REG_INC_NOTE(INSN, REG) \
1293 ((REG) != NULL_RTX && REG_P ((REG)) \
1294 ? find_regno_note ((INSN), REG_INC, REGNO (REG)) \
1295 : find_reg_note ((INSN), REG_INC, (REG)))
1296 #else
1297 #define FIND_REG_INC_NOTE(INSN, REG) 0
1298 #endif
1299
1300 /* Indicate whether the machine has any sort of auto increment addressing.
1301 If not, we can avoid checking for REG_INC notes. */
1302
1303 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1304 #define AUTO_INC_DEC
1305 #endif
1306
1307 #ifndef HAVE_PRE_INCREMENT
1308 #define HAVE_PRE_INCREMENT 0
1309 #endif
1310
1311 #ifndef HAVE_PRE_DECREMENT
1312 #define HAVE_PRE_DECREMENT 0
1313 #endif
1314
1315 #ifndef HAVE_POST_INCREMENT
1316 #define HAVE_POST_INCREMENT 0
1317 #endif
1318
1319 #ifndef HAVE_POST_DECREMENT
1320 #define HAVE_POST_DECREMENT 0
1321 #endif
1322
1323 #ifndef HAVE_POST_MODIFY_DISP
1324 #define HAVE_POST_MODIFY_DISP 0
1325 #endif
1326
1327 #ifndef HAVE_POST_MODIFY_REG
1328 #define HAVE_POST_MODIFY_REG 0
1329 #endif
1330
1331 #ifndef HAVE_PRE_MODIFY_DISP
1332 #define HAVE_PRE_MODIFY_DISP 0
1333 #endif
1334
1335 #ifndef HAVE_PRE_MODIFY_REG
1336 #define HAVE_PRE_MODIFY_REG 0
1337 #endif
1338
1339
1340 /* Some architectures do not have complete pre/post increment/decrement
1341 instruction sets, or only move some modes efficiently. These macros
1342 allow us to tune autoincrement generation. */
1343
1344 #ifndef USE_LOAD_POST_INCREMENT
1345 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1346 #endif
1347
1348 #ifndef USE_LOAD_POST_DECREMENT
1349 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1350 #endif
1351
1352 #ifndef USE_LOAD_PRE_INCREMENT
1353 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1354 #endif
1355
1356 #ifndef USE_LOAD_PRE_DECREMENT
1357 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1358 #endif
1359
1360 #ifndef USE_STORE_POST_INCREMENT
1361 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1362 #endif
1363
1364 #ifndef USE_STORE_POST_DECREMENT
1365 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1366 #endif
1367
1368 #ifndef USE_STORE_PRE_INCREMENT
1369 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1370 #endif
1371
1372 #ifndef USE_STORE_PRE_DECREMENT
1373 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1374 #endif
1375
1376 /* Determine if the insn is a PHI node. */
1377 #define PHI_NODE_P(X) \
1378 ((X) && GET_CODE (X) == INSN \
1379 && GET_CODE (PATTERN (X)) == SET \
1380 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1381 \f
1382 /* Nonzero if we need to distinguish between the return value of this function
1383 and the return value of a function called by this function. This helps
1384 integrate.c.
1385 This is 1 until after the rtl generation pass. */
1386 extern int rtx_equal_function_value_matters;
1387
1388 /* Nonzero when we are generating CONCATs. */
1389 extern int generating_concat_p;
1390
1391 /* Generally useful functions. */
1392
1393 /* In expmed.c */
1394 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1395
1396 #define plus_constant(X, C) plus_constant_wide ((X), (HOST_WIDE_INT) (C))
1397
1398 /* In builtins.c */
1399 extern rtx expand_builtin_expect_jump PARAMS ((tree, rtx, rtx));
1400 extern void purge_builtin_constant_p PARAMS ((void));
1401
1402 /* In explow.c */
1403 extern void set_stack_check_libfunc PARAMS ((rtx));
1404 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1405 enum machine_mode));
1406 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1407 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1408 extern void optimize_save_area_alloca PARAMS ((rtx));
1409
1410 /* In emit-rtl.c */
1411 extern rtx gen_rtx PARAMS ((enum rtx_code,
1412 enum machine_mode, ...));
1413 extern rtvec gen_rtvec PARAMS ((int, ...));
1414 extern rtx copy_insn_1 PARAMS ((rtx));
1415 extern rtx copy_insn PARAMS ((rtx));
1416 extern rtx gen_int_mode PARAMS ((HOST_WIDE_INT,
1417 enum machine_mode));
1418 extern rtx emit_copy_of_insn_after PARAMS ((rtx, rtx));
1419 extern void set_reg_attrs_from_mem PARAMS ((rtx, rtx));
1420 extern void set_mem_attrs_from_reg PARAMS ((rtx, rtx));
1421 extern void set_reg_attrs_for_parm PARAMS ((rtx, rtx));
1422
1423 /* In rtl.c */
1424 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1425 extern rtvec rtvec_alloc PARAMS ((int));
1426 extern rtx copy_rtx PARAMS ((rtx));
1427
1428 /* In emit-rtl.c */
1429 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1430
1431 /* In rtl.c */
1432 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1433 extern rtx shallow_copy_rtx PARAMS ((rtx));
1434 extern int rtx_equal_p PARAMS ((rtx, rtx));
1435
1436 /* In emit-rtl.c */
1437 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1438 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1439 extern rtx gen_rtx_REG_offset PARAMS ((rtx, enum machine_mode,
1440 unsigned int, int));
1441 extern rtx gen_label_rtx PARAMS ((void));
1442 extern int subreg_hard_regno PARAMS ((rtx, int));
1443 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1444 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1445
1446 /* In cse.c */
1447 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1448
1449 /* In emit-rtl.c */
1450 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1451 extern rtx gen_highpart_mode PARAMS ((enum machine_mode,
1452 enum machine_mode, rtx));
1453 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1454 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1455 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1456 enum machine_mode));
1457 extern rtx constant_subword PARAMS ((rtx, int,
1458 enum machine_mode));
1459
1460 /* In emit-rtl.c */
1461 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1462 enum machine_mode));
1463 extern int subreg_lowpart_p PARAMS ((rtx));
1464 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1465 enum machine_mode));
1466 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1467 enum machine_mode));
1468 extern rtx make_safe_from PARAMS ((rtx, rtx));
1469 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1470 extern rtx get_insns PARAMS ((void));
1471 extern const char *get_insn_name PARAMS ((int));
1472 extern rtx get_last_insn PARAMS ((void));
1473 extern rtx get_last_insn_anywhere PARAMS ((void));
1474 extern rtx get_first_nonnote_insn PARAMS ((void));
1475 extern rtx get_last_nonnote_insn PARAMS ((void));
1476 extern void start_sequence PARAMS ((void));
1477 extern void push_to_sequence PARAMS ((rtx));
1478 extern void end_sequence PARAMS ((void));
1479 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1480 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1481
1482 /* In varasm.c */
1483 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1484 extern rtx mem_for_const_double PARAMS ((rtx));
1485 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1486
1487 /* In varasm.c */
1488 extern rtx get_pool_constant PARAMS ((rtx));
1489 extern rtx get_pool_constant_mark PARAMS ((rtx, bool *));
1490 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1491 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1492 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1493 extern int get_pool_offset PARAMS ((rtx));
1494 extern rtx simplify_subtraction PARAMS ((rtx));
1495
1496 /* In function.c */
1497 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1498 HOST_WIDE_INT, int));
1499 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1500 HOST_WIDE_INT, int));
1501 extern rtx assign_stack_temp_for_type PARAMS ((enum machine_mode,
1502 HOST_WIDE_INT, int, tree));
1503 extern rtx assign_temp PARAMS ((tree, int, int, int));
1504 /* In emit-rtl.c */
1505 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1506 extern rtx emit_insn_before_scope PARAMS ((rtx, rtx, tree));
1507 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1508 extern rtx emit_jump_insn_before_scope PARAMS ((rtx, rtx, tree));
1509 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1510 extern rtx emit_call_insn_before_scope PARAMS ((rtx, rtx, tree));
1511 extern rtx emit_barrier_before PARAMS ((rtx));
1512 extern rtx emit_label_before PARAMS ((rtx, rtx));
1513 extern rtx emit_note_before PARAMS ((int, rtx));
1514 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1515 extern rtx emit_insn_after_scope PARAMS ((rtx, rtx, tree));
1516 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1517 extern rtx emit_jump_insn_after_scope PARAMS ((rtx, rtx, tree));
1518 extern rtx emit_call_insn_after PARAMS ((rtx, rtx));
1519 extern rtx emit_call_insn_after_scope PARAMS ((rtx, rtx, tree));
1520 extern rtx emit_barrier_after PARAMS ((rtx));
1521 extern rtx emit_label_after PARAMS ((rtx, rtx));
1522 extern rtx emit_note_after PARAMS ((int, rtx));
1523 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1524 extern rtx emit_insn PARAMS ((rtx));
1525 extern rtx emit_jump_insn PARAMS ((rtx));
1526 extern rtx emit_call_insn PARAMS ((rtx));
1527 extern rtx emit_label PARAMS ((rtx));
1528 extern rtx emit_barrier PARAMS ((void));
1529 extern rtx emit_line_note PARAMS ((const char *, int));
1530 extern rtx emit_note PARAMS ((const char *, int));
1531 extern rtx emit_line_note_force PARAMS ((const char *, int));
1532 extern rtx make_insn_raw PARAMS ((rtx));
1533 extern rtx previous_insn PARAMS ((rtx));
1534 extern rtx next_insn PARAMS ((rtx));
1535 extern rtx prev_nonnote_insn PARAMS ((rtx));
1536 extern rtx next_nonnote_insn PARAMS ((rtx));
1537 extern rtx prev_real_insn PARAMS ((rtx));
1538 extern rtx next_real_insn PARAMS ((rtx));
1539 extern rtx prev_active_insn PARAMS ((rtx));
1540 extern rtx next_active_insn PARAMS ((rtx));
1541 extern int active_insn_p PARAMS ((rtx));
1542 extern rtx prev_label PARAMS ((rtx));
1543 extern rtx next_label PARAMS ((rtx));
1544 extern rtx next_cc0_user PARAMS ((rtx));
1545 extern rtx prev_cc0_setter PARAMS ((rtx));
1546
1547 /* In cfglayout.c */
1548 extern tree choose_inner_scope PARAMS ((tree, tree));
1549
1550 /* In jump.c */
1551 extern rtx next_nondeleted_insn PARAMS ((rtx));
1552 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1553 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1554 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1555 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1556 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1557 extern void mark_jump_label PARAMS ((rtx, rtx, int));
1558 extern void cleanup_barriers PARAMS ((void));
1559
1560 /* In jump.c */
1561 extern bool squeeze_notes PARAMS ((rtx *, rtx *));
1562 extern rtx delete_related_insns PARAMS ((rtx));
1563 extern void delete_jump PARAMS ((rtx));
1564 extern void delete_barrier PARAMS ((rtx));
1565 extern rtx get_label_before PARAMS ((rtx));
1566 extern rtx get_label_after PARAMS ((rtx));
1567 extern rtx follow_jumps PARAMS ((rtx));
1568
1569 /* In recog.c */
1570 extern rtx *find_constant_term_loc PARAMS ((rtx *));
1571
1572 /* In emit-rtl.c */
1573 extern rtx try_split PARAMS ((rtx, rtx, int));
1574 extern int split_branch_probability;
1575
1576 /* In unknown file */
1577 extern rtx split_insns PARAMS ((rtx, rtx));
1578
1579 /* In simplify-rtx.c */
1580 extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1581 enum machine_mode, rtx,
1582 enum machine_mode));
1583 extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1584 enum machine_mode, rtx,
1585 rtx));
1586 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1587 enum machine_mode,
1588 enum machine_mode, rtx, rtx,
1589 rtx));
1590 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1591 enum machine_mode, rtx,
1592 rtx));
1593 extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1594 enum machine_mode,
1595 rtx, rtx));
1596 extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1597 enum machine_mode, rtx,
1598 enum machine_mode));
1599 extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1600 enum machine_mode,
1601 enum machine_mode,
1602 rtx, rtx, rtx));
1603 extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
1604 enum machine_mode,
1605 enum machine_mode,
1606 rtx, rtx));
1607 extern rtx simplify_subreg PARAMS ((enum machine_mode,
1608 rtx,
1609 enum machine_mode,
1610 unsigned int));
1611 extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1612 rtx,
1613 enum machine_mode,
1614 unsigned int));
1615 extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
1616 extern rtx simplify_rtx PARAMS ((rtx));
1617 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1618
1619 /* In function.c */
1620 extern rtx gen_mem_addressof PARAMS ((rtx, tree, int));
1621
1622 /* In regclass.c */
1623 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1624 unsigned int));
1625
1626 /* In emit-rtl.c */
1627 extern rtx set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1628
1629 /* Functions in rtlanal.c */
1630
1631 /* Single set is implemented as macro for performance reasons. */
1632 #define single_set(I) (INSN_P (I) \
1633 ? (GET_CODE (PATTERN (I)) == SET \
1634 ? PATTERN (I) : single_set_1 (I)) \
1635 : NULL_RTX)
1636 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1637
1638 /* Structure used for passing data to REPLACE_LABEL. */
1639 typedef struct replace_label_data
1640 {
1641 rtx r1;
1642 rtx r2;
1643 bool update_label_nuses;
1644 } replace_label_data;
1645
1646 extern int rtx_addr_can_trap_p PARAMS ((rtx));
1647 extern bool nonzero_address_p PARAMS ((rtx));
1648 extern int rtx_unstable_p PARAMS ((rtx));
1649 extern int rtx_varies_p PARAMS ((rtx, int));
1650 extern int rtx_addr_varies_p PARAMS ((rtx, int));
1651 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1652 extern rtx get_related_value PARAMS ((rtx));
1653 extern rtx get_jump_table_offset PARAMS ((rtx, rtx *));
1654 extern int global_reg_mentioned_p PARAMS ((rtx));
1655 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1656 extern int count_occurrences PARAMS ((rtx, rtx, int));
1657 extern int reg_referenced_p PARAMS ((rtx, rtx));
1658 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1659 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1660 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1661 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1662 extern int commutative_operand_precedence PARAMS ((rtx));
1663 extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
1664 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1665 extern int no_labels_between_p PARAMS ((rtx, rtx));
1666 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1667 extern int modified_in_p PARAMS ((rtx, rtx));
1668 extern int insn_dependent_p PARAMS ((rtx, rtx));
1669 extern int reg_set_p PARAMS ((rtx, rtx));
1670 extern rtx single_set_2 PARAMS ((rtx, rtx));
1671 extern int multiple_sets PARAMS ((rtx));
1672 extern int set_noop_p PARAMS ((rtx));
1673 extern int noop_move_p PARAMS ((rtx));
1674 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1675 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1676 rtx, rtx *));
1677 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1678 extern rtx set_of PARAMS ((rtx, rtx));
1679 extern void note_stores PARAMS ((rtx,
1680 void (*) (rtx, rtx, void *),
1681 void *));
1682 extern void note_uses PARAMS ((rtx *,
1683 void (*) (rtx *, void *),
1684 void *));
1685 extern rtx reg_set_last PARAMS ((rtx, rtx));
1686 extern int dead_or_set_p PARAMS ((rtx, rtx));
1687 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1688 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1689 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1690 unsigned int));
1691 extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
1692 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1693 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1694 unsigned int));
1695 extern int pure_call_p PARAMS ((rtx));
1696 extern void remove_note PARAMS ((rtx, rtx));
1697 extern int side_effects_p PARAMS ((rtx));
1698 extern int volatile_refs_p PARAMS ((rtx));
1699 extern int volatile_insn_p PARAMS ((rtx));
1700 extern int may_trap_p PARAMS ((rtx));
1701 extern int inequality_comparisons_p PARAMS ((rtx));
1702 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1703 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1704 int));
1705 extern int replace_label PARAMS ((rtx *, void *));
1706 extern int rtx_referenced_p PARAMS ((rtx, rtx));
1707 extern bool tablejump_p PARAMS ((rtx, rtx *, rtx *));
1708 extern int computed_jump_p PARAMS ((rtx));
1709 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1710 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1711 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1712 extern int auto_inc_p PARAMS ((rtx));
1713 extern int in_expr_list_p PARAMS ((rtx, rtx));
1714 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1715 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1716 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1717 extern rtx find_first_parameter_load PARAMS ((rtx, rtx));
1718 extern bool keep_with_call_p PARAMS ((rtx));
1719
1720 /* flow.c */
1721
1722 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1723
1724 /* lists.c */
1725
1726 void free_EXPR_LIST_list PARAMS ((rtx *));
1727 void free_INSN_LIST_list PARAMS ((rtx *));
1728 void free_EXPR_LIST_node PARAMS ((rtx));
1729 void free_INSN_LIST_node PARAMS ((rtx));
1730 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1731 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1732
1733 /* regclass.c */
1734
1735 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1736 Always at least 3, since the combiner could put that many togetherm
1737 and we want this to remain correct for all the remaining passes. */
1738
1739 extern int max_parallel;
1740
1741 /* Free up register info memory. */
1742 extern void free_reg_info PARAMS ((void));
1743
1744 /* recog.c */
1745 extern int asm_noperands PARAMS ((rtx));
1746 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1747 const char **,
1748 enum machine_mode *));
1749
1750 extern enum reg_class reg_preferred_class PARAMS ((int));
1751 extern enum reg_class reg_alternate_class PARAMS ((int));
1752
1753 extern rtx get_first_nonparm_insn PARAMS ((void));
1754
1755 extern void split_all_insns PARAMS ((int));
1756 extern void split_all_insns_noflow PARAMS ((void));
1757
1758 #define MAX_SAVED_CONST_INT 64
1759 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1760
1761 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1762 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1763 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1764 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1765 extern GTY(()) rtx const_true_rtx;
1766
1767 extern GTY(()) rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1768
1769 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1770 same as VOIDmode. */
1771
1772 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1773
1774 /* Likewise, for the constants 1 and 2. */
1775
1776 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1777 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1778
1779 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1780 is used to represent the frame pointer. This is because the
1781 hard frame pointer and the automatic variables are separated by an amount
1782 that cannot be determined until after register allocation. We can assume
1783 that in this case ELIMINABLE_REGS will be defined, one action of which
1784 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1785 #ifndef HARD_FRAME_POINTER_REGNUM
1786 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1787 #endif
1788
1789 /* Index labels for global_rtl. */
1790 enum global_rtl_index
1791 {
1792 GR_PC,
1793 GR_CC0,
1794 GR_STACK_POINTER,
1795 GR_FRAME_POINTER,
1796 /* For register elimination to work properly these hard_frame_pointer_rtx,
1797 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1798 the same register. */
1799 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1800 GR_ARG_POINTER = GR_FRAME_POINTER,
1801 #endif
1802 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1803 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1804 #else
1805 GR_HARD_FRAME_POINTER,
1806 #endif
1807 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1808 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1809 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1810 #else
1811 GR_ARG_POINTER,
1812 #endif
1813 #endif
1814 GR_VIRTUAL_INCOMING_ARGS,
1815 GR_VIRTUAL_STACK_ARGS,
1816 GR_VIRTUAL_STACK_DYNAMIC,
1817 GR_VIRTUAL_OUTGOING_ARGS,
1818 GR_VIRTUAL_CFA,
1819
1820 GR_MAX
1821 };
1822
1823 /* Pointers to standard pieces of rtx are stored here. */
1824 extern GTY(()) rtx global_rtl[GR_MAX];
1825
1826 /* Standard pieces of rtx, to be substituted directly into things. */
1827 #define pc_rtx (global_rtl[GR_PC])
1828 #define cc0_rtx (global_rtl[GR_CC0])
1829
1830 /* All references to certain hard regs, except those created
1831 by allocating pseudo regs into them (when that's possible),
1832 go through these unique rtx objects. */
1833 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1834 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1835 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1836 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1837
1838 extern GTY(()) rtx pic_offset_table_rtx;
1839 extern GTY(()) rtx struct_value_rtx;
1840 extern GTY(()) rtx struct_value_incoming_rtx;
1841 extern GTY(()) rtx static_chain_rtx;
1842 extern GTY(()) rtx static_chain_incoming_rtx;
1843 extern GTY(()) rtx return_address_pointer_rtx;
1844
1845 /* Include the RTL generation functions. */
1846
1847 #ifndef NO_GENRTL_H
1848 #include "genrtl.h"
1849 #endif
1850
1851 /* There are some RTL codes that require special attention; the
1852 generation functions included above do the raw handling. If you
1853 add to this list, modify special_rtx in gengenrtl.c as well. You
1854 should also modify gen_rtx to use the special function. */
1855
1856 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1857 extern rtx gen_rtx_CONST_VECTOR PARAMS ((enum machine_mode, rtvec));
1858 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1859 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, unsigned));
1860 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1861 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1862
1863 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1864
1865 /* We need the cast here to ensure that we get the same result both with
1866 and without prototypes. */
1867 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1868
1869 /* Virtual registers are used during RTL generation to refer to locations into
1870 the stack frame when the actual location isn't known until RTL generation
1871 is complete. The routine instantiate_virtual_regs replaces these with
1872 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1873 a constant. */
1874
1875 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1876
1877 /* This points to the first word of the incoming arguments passed on the stack,
1878 either by the caller or by the callee when pretending it was passed by the
1879 caller. */
1880
1881 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1882
1883 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1884
1885 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1886 variable on the stack. Otherwise, it points to the first variable on
1887 the stack. */
1888
1889 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1890
1891 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1892
1893 /* This points to the location of dynamically-allocated memory on the stack
1894 immediately after the stack pointer has been adjusted by the amount
1895 desired. */
1896
1897 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1898
1899 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1900
1901 /* This points to the location in the stack at which outgoing arguments should
1902 be written when the stack is pre-pushed (arguments pushed using push
1903 insns always use sp). */
1904
1905 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1906
1907 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1908
1909 /* This points to the Canonical Frame Address of the function. This
1910 should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1911 but is calculated relative to the arg pointer for simplicity; the
1912 frame pointer nor stack pointer are necessarily fixed relative to
1913 the CFA until after reload. */
1914
1915 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1916
1917 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1918
1919 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1920
1921 /* Nonzero if REGNUM is a pointer into the stack frame. */
1922 #define REGNO_PTR_FRAME_P(REGNUM) \
1923 ((REGNUM) == STACK_POINTER_REGNUM \
1924 || (REGNUM) == FRAME_POINTER_REGNUM \
1925 || (REGNUM) == HARD_FRAME_POINTER_REGNUM \
1926 || (REGNUM) == ARG_POINTER_REGNUM \
1927 || ((REGNUM) >= FIRST_VIRTUAL_REGISTER \
1928 && (REGNUM) <= LAST_VIRTUAL_REGISTER))
1929
1930 /* REGNUM never really appearing in the INSN stream. */
1931 #define INVALID_REGNUM (~(unsigned int) 0)
1932
1933 extern rtx find_next_ref PARAMS ((rtx, rtx));
1934
1935 extern rtx output_constant_def PARAMS ((tree, int));
1936
1937 /* Define a default value for STORE_FLAG_VALUE. */
1938
1939 #ifndef STORE_FLAG_VALUE
1940 #define STORE_FLAG_VALUE 1
1941 #endif
1942
1943 /* Nonzero after the second flow pass has completed.
1944 Set to 1 or 0 by toplev.c */
1945 extern int flow2_completed;
1946
1947 /* Nonzero after end of reload pass.
1948 Set to 1 or 0 by reload1.c. */
1949
1950 extern int reload_completed;
1951
1952 /* Set to 1 while reload_as_needed is operating.
1953 Required by some machines to handle any generated moves differently. */
1954
1955 extern int reload_in_progress;
1956
1957 /* If this is nonzero, we do not bother generating VOLATILE
1958 around volatile memory references, and we are willing to
1959 output indirect addresses. If cse is to follow, we reject
1960 indirect addresses so a useful potential cse is generated;
1961 if it is used only once, instruction combination will produce
1962 the same indirect address eventually. */
1963 extern int cse_not_expected;
1964
1965 /* Set to nonzero before life analysis to indicate that it is unsafe to
1966 generate any new pseudo registers. */
1967 extern int no_new_pseudos;
1968
1969 /* Translates rtx code to tree code, for those codes needed by
1970 REAL_ARITHMETIC. The function returns an int because the caller may not
1971 know what `enum tree_code' means. */
1972
1973 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1974
1975 /* In cse.c */
1976 struct cse_basic_block_data;
1977
1978 /* Return the right cost to give to an operation
1979 to make the cost of the corresponding register-to-register instruction
1980 N times that of a fast register-to-register instruction. */
1981 #define COSTS_N_INSNS(N) ((N) * 4)
1982
1983 /* Maximum cost of a rtl expression. This value has the special meaning
1984 not to use an rtx with this cost under any circumstances. */
1985 #define MAX_COST INT_MAX
1986
1987 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1988 extern int address_cost PARAMS ((rtx, enum machine_mode));
1989 extern int delete_trivially_dead_insns PARAMS ((rtx, int));
1990 #ifdef BUFSIZ
1991 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1992 #endif
1993 extern void cse_end_of_basic_block PARAMS ((rtx,
1994 struct cse_basic_block_data *,
1995 int, int, int));
1996
1997 /* In jump.c */
1998 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1999 extern int condjump_p PARAMS ((rtx));
2000 extern int any_condjump_p PARAMS ((rtx));
2001 extern int any_uncondjump_p PARAMS ((rtx));
2002 extern int safe_to_remove_jump_p PARAMS ((rtx));
2003 extern rtx pc_set PARAMS ((rtx));
2004 extern rtx condjump_label PARAMS ((rtx));
2005 extern int simplejump_p PARAMS ((rtx));
2006 extern int returnjump_p PARAMS ((rtx));
2007 extern int onlyjump_p PARAMS ((rtx));
2008 extern int only_sets_cc0_p PARAMS ((rtx));
2009 extern int sets_cc0_p PARAMS ((rtx));
2010 extern int invert_jump_1 PARAMS ((rtx, rtx));
2011 extern int invert_jump PARAMS ((rtx, rtx, int));
2012 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
2013 extern int true_regnum PARAMS ((rtx));
2014 extern unsigned int reg_or_subregno PARAMS ((rtx));
2015 extern int redirect_jump_1 PARAMS ((rtx, rtx));
2016 extern int redirect_jump PARAMS ((rtx, rtx, int));
2017 extern void rebuild_jump_labels PARAMS ((rtx));
2018 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
2019 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
2020 rtx, rtx, rtx));
2021 extern void delete_for_peephole PARAMS ((rtx, rtx));
2022 extern int condjump_in_parallel_p PARAMS ((rtx));
2023 extern void never_reached_warning PARAMS ((rtx, rtx));
2024 extern void purge_line_number_notes PARAMS ((rtx));
2025 extern void copy_loop_headers PARAMS ((rtx));
2026
2027 /* In emit-rtl.c. */
2028 extern int max_reg_num PARAMS ((void));
2029 extern int max_label_num PARAMS ((void));
2030 extern int get_first_label_num PARAMS ((void));
2031 extern void delete_insns_since PARAMS ((rtx));
2032 extern void mark_reg_pointer PARAMS ((rtx, int));
2033 extern void mark_user_reg PARAMS ((rtx));
2034 extern void reset_used_flags PARAMS ((rtx));
2035 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
2036 extern void reorder_insns_nobb PARAMS ((rtx, rtx, rtx));
2037 extern int get_max_uid PARAMS ((void));
2038 extern int in_sequence_p PARAMS ((void));
2039 extern void force_next_line_note PARAMS ((void));
2040 extern void init_emit PARAMS ((void));
2041 extern void init_emit_once PARAMS ((int));
2042 extern void push_topmost_sequence PARAMS ((void));
2043 extern void pop_topmost_sequence PARAMS ((void));
2044 extern int subreg_realpart_p PARAMS ((rtx));
2045 extern void reverse_comparison PARAMS ((rtx));
2046 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
2047 extern void set_new_first_and_last_label_num PARAMS ((int, int));
2048 extern void set_new_last_label_num PARAMS ((int));
2049 extern void unshare_all_rtl_again PARAMS ((rtx));
2050 extern void set_first_insn PARAMS ((rtx));
2051 extern void set_last_insn PARAMS ((rtx));
2052 extern void link_cc0_insns PARAMS ((rtx));
2053 extern void add_insn PARAMS ((rtx));
2054 extern void add_insn_before PARAMS ((rtx, rtx));
2055 extern void add_insn_after PARAMS ((rtx, rtx));
2056 extern void remove_insn PARAMS ((rtx));
2057 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
2058 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
2059 extern enum rtx_code classify_insn PARAMS ((rtx));
2060 extern rtx emit PARAMS ((rtx));
2061 /* Query and clear/ restore no_line_numbers. This is used by the
2062 switch / case handling in stmt.c to give proper line numbers in
2063 warnings about unreachable code. */
2064 int force_line_numbers PARAMS ((void));
2065 void restore_line_number_status PARAMS ((int old_value));
2066 extern void renumber_insns PARAMS ((FILE *));
2067 extern void remove_unnecessary_notes PARAMS ((void));
2068 extern rtx delete_insn PARAMS ((rtx));
2069 extern void delete_insn_chain PARAMS ((rtx, rtx));
2070 extern rtx delete_insn_and_edges PARAMS ((rtx));
2071 extern void delete_insn_chain_and_edges PARAMS ((rtx, rtx));
2072
2073 /* In combine.c */
2074 extern int combine_instructions PARAMS ((rtx, unsigned int));
2075 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
2076 extern rtx remove_death PARAMS ((unsigned int, rtx));
2077 #ifdef BUFSIZ
2078 extern void dump_combine_stats PARAMS ((FILE *));
2079 extern void dump_combine_total_stats PARAMS ((FILE *));
2080 #endif
2081
2082 /* In sched.c. */
2083 #ifdef BUFSIZ
2084 extern void schedule_insns PARAMS ((FILE *));
2085 extern void schedule_ebbs PARAMS ((FILE *));
2086 #endif
2087 extern void fix_sched_param PARAMS ((const char *, const char *));
2088
2089 /* In print-rtl.c */
2090 extern const char *print_rtx_head;
2091 extern void debug_rtx PARAMS ((rtx));
2092 extern void debug_rtx_list PARAMS ((rtx, int));
2093 extern void debug_rtx_range PARAMS ((rtx, rtx));
2094 extern rtx debug_rtx_find PARAMS ((rtx, int));
2095 #ifdef BUFSIZ
2096 extern void print_mem_expr PARAMS ((FILE *, tree));
2097 extern void print_rtl PARAMS ((FILE *, rtx));
2098 extern void print_simple_rtl PARAMS ((FILE *, rtx));
2099 extern int print_rtl_single PARAMS ((FILE *, rtx));
2100 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
2101 #endif
2102
2103 /* In loop.c */
2104 extern void init_loop PARAMS ((void));
2105 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
2106 #ifdef BUFSIZ
2107 extern void loop_optimize PARAMS ((rtx, FILE *, int));
2108 #endif
2109 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
2110
2111 /* In function.c */
2112 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
2113 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
2114 extern int prologue_epilogue_contains PARAMS ((rtx));
2115 extern int sibcall_epilogue_contains PARAMS ((rtx));
2116 extern void preserve_rtl_expr_result PARAMS ((rtx));
2117 extern void mark_temp_addr_taken PARAMS ((rtx));
2118 extern void update_temp_slot_address PARAMS ((rtx, rtx));
2119 extern void purge_addressof PARAMS ((rtx));
2120 extern void purge_hard_subreg_sets PARAMS ((rtx));
2121
2122 /* In stmt.c */
2123 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
2124 extern void expand_null_return PARAMS ((void));
2125 extern void emit_jump PARAMS ((rtx));
2126 extern int preserve_subexpressions_p PARAMS ((void));
2127
2128 /* In expr.c */
2129 extern void move_by_pieces PARAMS ((rtx, rtx,
2130 unsigned HOST_WIDE_INT,
2131 unsigned int));
2132
2133 /* In flow.c */
2134 extern void recompute_reg_usage PARAMS ((rtx, int));
2135 extern int initialize_uninitialized_subregs PARAMS ((void));
2136 extern void delete_dead_jumptables PARAMS ((void));
2137 #ifdef BUFSIZ
2138 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
2139 extern void dump_flow_info PARAMS ((FILE *));
2140 #endif
2141
2142 /* In expmed.c */
2143 extern void init_expmed PARAMS ((void));
2144 extern void expand_inc PARAMS ((rtx, rtx));
2145 extern void expand_dec PARAMS ((rtx, rtx));
2146 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
2147 unsigned HOST_WIDE_INT, rtx,
2148 int, int));
2149
2150 /* In gcse.c */
2151 extern bool can_copy_p PARAMS ((enum machine_mode));
2152 #ifdef BUFSIZ
2153 extern int gcse_main PARAMS ((rtx, FILE *));
2154 extern int bypass_jumps PARAMS ((FILE *));
2155 #endif
2156
2157 /* In global.c */
2158 extern void mark_elimination PARAMS ((int, int));
2159 #ifdef BUFSIZ
2160 extern int global_alloc PARAMS ((FILE *));
2161 extern void dump_global_regs PARAMS ((FILE *));
2162 #endif
2163 #ifdef HARD_CONST
2164 /* Yes, this ifdef is silly, but HARD_REG_SET is not always defined. */
2165 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
2166 #endif
2167 extern void build_insn_chain PARAMS ((rtx));
2168
2169 /* In regclass.c */
2170 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
2171 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
2172 extern void globalize_reg PARAMS ((int));
2173 extern void init_regs PARAMS ((void));
2174 extern void init_fake_stack_mems PARAMS ((void));
2175 extern void init_reg_sets PARAMS ((void));
2176 extern void regset_release_memory PARAMS ((void));
2177 extern void regclass_init PARAMS ((void));
2178 extern void regclass PARAMS ((rtx, int, FILE *));
2179 extern void reg_scan PARAMS ((rtx, unsigned int, int));
2180 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
2181 extern void fix_register PARAMS ((const char *, int, int));
2182 #ifdef HARD_CONST
2183 extern void cannot_change_mode_set_regs PARAMS ((HARD_REG_SET *,
2184 enum machine_mode,
2185 unsigned int));
2186 #endif
2187 extern bool invalid_mode_change_p PARAMS ((unsigned int,
2188 enum reg_class,
2189 enum machine_mode));
2190
2191 extern int delete_null_pointer_checks PARAMS ((rtx));
2192
2193 /* In regmove.c */
2194 #ifdef BUFSIZ
2195 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
2196 #endif
2197 extern void combine_stack_adjustments PARAMS ((void));
2198
2199 /* In reorg.c */
2200 #ifdef BUFSIZ
2201 extern void dbr_schedule PARAMS ((rtx, FILE *));
2202 #endif
2203
2204 /* In local-alloc.c */
2205 #ifdef BUFSIZ
2206 extern void dump_local_alloc PARAMS ((FILE *));
2207 #endif
2208 extern int local_alloc PARAMS ((void));
2209 extern int function_invariant_p PARAMS ((rtx));
2210
2211 /* In profile.c */
2212 extern void init_branch_prob PARAMS ((const char *));
2213 extern void branch_prob PARAMS ((void));
2214 extern void end_branch_prob PARAMS ((void));
2215 extern void create_profiler PARAMS ((void));
2216
2217 /* In reg-stack.c */
2218 #ifdef BUFSIZ
2219 extern bool reg_to_stack PARAMS ((rtx, FILE *));
2220 #endif
2221
2222 /* In fold-const.c */
2223 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2224 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2225 unsigned HOST_WIDE_INT *,
2226 HOST_WIDE_INT *));
2227 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2228 unsigned HOST_WIDE_INT *,
2229 HOST_WIDE_INT *));
2230 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
2231 HOST_WIDE_INT,
2232 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2233 unsigned HOST_WIDE_INT *,
2234 HOST_WIDE_INT *));
2235 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2236 HOST_WIDE_INT, unsigned int,
2237 unsigned HOST_WIDE_INT *,
2238 HOST_WIDE_INT *, int));
2239 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2240 HOST_WIDE_INT, unsigned int,
2241 unsigned HOST_WIDE_INT *,
2242 HOST_WIDE_INT *, int));
2243 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2244 HOST_WIDE_INT, unsigned int,
2245 unsigned HOST_WIDE_INT *,
2246 HOST_WIDE_INT *));
2247 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2248 HOST_WIDE_INT, unsigned int,
2249 unsigned HOST_WIDE_INT *,
2250 HOST_WIDE_INT *));
2251
2252 /* In calls.c */
2253 enum libcall_type
2254 {
2255 LCT_NORMAL = 0,
2256 LCT_CONST = 1,
2257 LCT_PURE = 2,
2258 LCT_CONST_MAKE_BLOCK = 3,
2259 LCT_PURE_MAKE_BLOCK = 4,
2260 LCT_NORETURN = 5,
2261 LCT_THROW = 6,
2262 LCT_ALWAYS_RETURN = 7,
2263 LCT_RETURNS_TWICE = 8
2264 };
2265
2266 extern void emit_library_call PARAMS ((rtx, enum libcall_type,
2267 enum machine_mode, int,
2268 ...));
2269 extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
2270 enum machine_mode, int,
2271 ...));
2272
2273 /* In unroll.c */
2274 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
2275
2276 /* In varasm.c */
2277 extern int in_data_section PARAMS ((void));
2278 extern void init_varasm_once PARAMS ((void));
2279
2280 /* In rtl.c */
2281 extern void init_rtl PARAMS ((void));
2282 extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
2283 void *));
2284 struct md_constant { char *name, *value; };
2285
2286 #ifdef BUFSIZ
2287 extern int read_skip_spaces PARAMS ((FILE *));
2288 extern rtx read_rtx PARAMS ((FILE *));
2289 #endif
2290
2291 extern const char *read_rtx_filename;
2292 extern int read_rtx_lineno;
2293
2294 /* Redefine abort to report an internal error w/o coredump, and
2295 reporting the location of the error in the source file. This logic
2296 is duplicated in rtl.h and tree.h because every file that needs the
2297 special abort includes one or both. toplev.h gets too few files,
2298 system.h gets too many. */
2299
2300 extern void fancy_abort PARAMS ((const char *, int, const char *))
2301 ATTRIBUTE_NORETURN;
2302 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
2303
2304 /* In alias.c */
2305 extern void clear_reg_alias_info PARAMS ((rtx));
2306 extern rtx canon_rtx PARAMS ((rtx));
2307 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2308 int (*)(rtx, int)));
2309 extern rtx get_addr PARAMS ((rtx));
2310 extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2311 rtx, int (*)(rtx, int)));
2312 extern int read_dependence PARAMS ((rtx, rtx));
2313 extern int anti_dependence PARAMS ((rtx, rtx));
2314 extern int output_dependence PARAMS ((rtx, rtx));
2315 extern void mark_constant_function PARAMS ((void));
2316 extern void init_alias_once PARAMS ((void));
2317 extern void init_alias_analysis PARAMS ((void));
2318 extern void end_alias_analysis PARAMS ((void));
2319 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
2320 extern bool memory_modified_in_insn_p PARAMS ((rtx, rtx));
2321 extern rtx find_base_term PARAMS ((rtx));
2322
2323 /* In sibcall.c */
2324 typedef enum {
2325 sibcall_use_normal = 1,
2326 sibcall_use_tail_recursion,
2327 sibcall_use_sibcall
2328 } sibcall_use_t;
2329
2330 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2331 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2332
2333 #ifdef STACK_REGS
2334 extern int stack_regs_mentioned PARAMS ((rtx insn));
2335 #endif
2336
2337 /* In toplev.c */
2338 extern GTY(()) rtx stack_limit_rtx;
2339
2340 /* In regrename.c */
2341 extern void regrename_optimize PARAMS ((void));
2342 extern void copyprop_hardreg_forward PARAMS ((void));
2343
2344 /* In ifcvt.c */
2345 extern void if_convert PARAMS ((int));
2346
2347 /* In predict.c */
2348 extern void invert_br_probabilities PARAMS ((rtx));
2349 extern bool expensive_function_p PARAMS ((int));
2350 /* In tracer.c */
2351 extern void tracer PARAMS ((void));
2352
2353 /* In calls.c */
2354
2355 /* Nonzero if this is a call to a `const' function. */
2356 #define ECF_CONST 1
2357 /* Nonzero if this is a call to a `volatile' function. */
2358 #define ECF_NORETURN 2
2359 /* Nonzero if this is a call to malloc or a related function. */
2360 #define ECF_MALLOC 4
2361 /* Nonzero if it is plausible that this is a call to alloca. */
2362 #define ECF_MAY_BE_ALLOCA 8
2363 /* Nonzero if this is a call to a function that won't throw an exception. */
2364 #define ECF_NOTHROW 16
2365 /* Nonzero if this is a call to setjmp or a related function. */
2366 #define ECF_RETURNS_TWICE 32
2367 /* Nonzero if this is a call to `longjmp'. */
2368 #define ECF_LONGJMP 64
2369 /* Nonzero if this is a syscall that makes a new process in the image of
2370 the current one. */
2371 #define ECF_FORK_OR_EXEC 128
2372 #define ECF_SIBCALL 256
2373 /* Nonzero if this is a call to "pure" function (like const function,
2374 but may read memory. */
2375 #define ECF_PURE 512
2376 /* Nonzero if this is a call to a function that returns with the stack
2377 pointer depressed. */
2378 #define ECF_SP_DEPRESSED 1024
2379 /* Nonzero if this call is known to always return. */
2380 #define ECF_ALWAYS_RETURN 2048
2381 /* Create libcall block around the call. */
2382 #define ECF_LIBCALL_BLOCK 4096
2383
2384 extern int flags_from_decl_or_type PARAMS ((tree));
2385
2386 #endif /* ! GCC_RTL_H */
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