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emit-rtl.c (reg_attrs_htab): New static variable.
[gcc.git] / gcc / rtl.h
1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 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 cc0. */
277 #ifdef HAVE_cc0
278 #define CC0_P(X) ((X) == cc0_rtx)
279 #else
280 #define CC0_P(X) 0
281 #endif
282
283 /* Predicate yielding nonzero iff X is a data for a jump table. */
284 #define JUMP_TABLE_DATA_P(INSN) \
285 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
286 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
287
288 /* 1 if X is a constant value that is an integer. */
289
290 #define CONSTANT_P(X) \
291 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
292 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
293 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
294 || GET_CODE (X) == CONST_VECTOR \
295 || GET_CODE (X) == CONSTANT_P_RTX)
296
297 /* General accessor macros for accessing the fields of an rtx. */
298
299 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
300 /* The bit with a star outside the statement expr and an & inside is
301 so that N can be evaluated only once. */
302 #define RTL_CHECK1(RTX, N, C1) __extension__ \
303 (*({ rtx const _rtx = (RTX); const int _n = (N); \
304 const enum rtx_code _code = GET_CODE (_rtx); \
305 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
306 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
307 __FUNCTION__); \
308 if (GET_RTX_FORMAT(_code)[_n] != C1) \
309 rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
310 __FUNCTION__); \
311 &_rtx->fld[_n]; }))
312
313 #define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
314 (*({ rtx const _rtx = (RTX); const int _n = (N); \
315 const enum rtx_code _code = GET_CODE (_rtx); \
316 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
317 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
318 __FUNCTION__); \
319 if (GET_RTX_FORMAT(_code)[_n] != C1 \
320 && GET_RTX_FORMAT(_code)[_n] != C2) \
321 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
322 __FUNCTION__); \
323 &_rtx->fld[_n]; }))
324
325 #define RTL_CHECKC1(RTX, N, C) __extension__ \
326 (*({ rtx const _rtx = (RTX); const int _n = (N); \
327 if (GET_CODE (_rtx) != (C)) \
328 rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
329 __FUNCTION__); \
330 &_rtx->fld[_n]; }))
331
332 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
333 (*({ rtx const _rtx = (RTX); const int _n = (N); \
334 const enum rtx_code _code = GET_CODE (_rtx); \
335 if (_code != (C1) && _code != (C2)) \
336 rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__, \
337 __FUNCTION__); \
338 &_rtx->fld[_n]; }))
339
340 #define RTVEC_ELT(RTVEC, I) __extension__ \
341 (*({ rtvec const _rtvec = (RTVEC); const int _i = (I); \
342 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
343 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
344 __FUNCTION__); \
345 &_rtvec->elem[_i]; }))
346
347 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
348 const char *, int, const char *))
349 ATTRIBUTE_NORETURN;
350 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
351 const char *, int, const char *))
352 ATTRIBUTE_NORETURN;
353 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
354 const char *, int, const char *))
355 ATTRIBUTE_NORETURN;
356 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
357 const char *, int, const char *))
358 ATTRIBUTE_NORETURN;
359 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
360 const char *, int, const char *))
361 ATTRIBUTE_NORETURN;
362 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
363 const char *, int, const char *))
364 ATTRIBUTE_NORETURN;
365
366 #else /* not ENABLE_RTL_CHECKING */
367
368 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
369 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
370 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
371 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
372 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
373
374 #endif
375
376 /* General accessor macros for accessing the flags of an rtx. */
377
378 /* Access an individual rtx flag, with no checking of any kind. */
379 #define RTX_FLAG(RTX, FLAG) ((RTX)->FLAG)
380
381 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
382 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__ \
383 ({ rtx const _rtx = (RTX); \
384 if (GET_CODE(_rtx) != C1) \
385 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
386 __FUNCTION__); \
387 _rtx; })
388
389 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__ \
390 ({ rtx const _rtx = (RTX); \
391 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2) \
392 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
393 __FUNCTION__); \
394 _rtx; })
395
396 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__ \
397 ({ rtx const _rtx = (RTX); \
398 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
399 && GET_CODE(_rtx) != C3) \
400 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
401 __FUNCTION__); \
402 _rtx; })
403
404 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__ \
405 ({ rtx const _rtx = (RTX); \
406 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
407 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4) \
408 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
409 __FUNCTION__); \
410 _rtx; })
411
412 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__ \
413 ({ rtx const _rtx = (RTX); \
414 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
415 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
416 && GET_CODE(_rtx) != C5) \
417 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
418 __FUNCTION__); \
419 _rtx; })
420
421 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) \
422 __extension__ \
423 ({ rtx const _rtx = (RTX); \
424 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
425 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
426 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6) \
427 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
428 __FUNCTION__); \
429 _rtx; })
430
431 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) \
432 __extension__ \
433 ({ rtx const _rtx = (RTX); \
434 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
435 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
436 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
437 && GET_CODE(_rtx) != C7) \
438 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
439 __FUNCTION__); \
440 _rtx; })
441
442 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) \
443 __extension__ \
444 ({ rtx const _rtx = (RTX); \
445 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
446 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
447 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
448 && GET_CODE(_rtx) != C7 && GET_CODE(_rtx) != C8) \
449 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
450 __FUNCTION__); \
451 _rtx; })
452
453 extern void rtl_check_failed_flag PARAMS ((const char *, rtx, const char *,
454 int, const char *))
455 ATTRIBUTE_NORETURN
456 ;
457
458 #else /* not ENABLE_RTL_FLAG_CHECKING */
459
460 #define RTL_FLAG_CHECK1(NAME, RTX, C1) (RTX)
461 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) (RTX)
462 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) (RTX)
463 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) (RTX)
464 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) (RTX)
465 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) (RTX)
466 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) (RTX)
467 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) (RTX)
468 #endif
469
470 #define CLEAR_RTX_FLAGS(RTX) \
471 do { \
472 rtx const _rtx = (RTX); \
473 _rtx->call = 0; \
474 _rtx->frame_related = 0; \
475 _rtx->in_struct = 0; \
476 _rtx->integrated = 0; \
477 _rtx->jump = 0; \
478 _rtx->unchanging = 0; \
479 _rtx->used = 0; \
480 _rtx->volatil = 0; \
481 } while (0)
482
483 #define XWINT(RTX, N) (RTL_CHECK1 (RTX, N, 'w').rtwint)
484 #define XINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rtint)
485 #define XSTR(RTX, N) (RTL_CHECK2 (RTX, N, 's', 'S').rtstr)
486 #define XEXP(RTX, N) (RTL_CHECK2 (RTX, N, 'e', 'u').rtx)
487 #define XVEC(RTX, N) (RTL_CHECK2 (RTX, N, 'E', 'V').rtvec)
488 #define XMODE(RTX, N) (RTL_CHECK1 (RTX, N, 'M').rttype)
489 #define XBITMAP(RTX, N) (RTL_CHECK1 (RTX, N, 'b').rtbit)
490 #define XTREE(RTX, N) (RTL_CHECK1 (RTX, N, 't').rttree)
491 #define XBBDEF(RTX, N) (RTL_CHECK1 (RTX, N, 'B').bb)
492 #define XTMPL(RTX, N) (RTL_CHECK1 (RTX, N, 'T').rtstr)
493
494 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
495 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
496
497 /* These are like XWINT, etc. except that they expect a '0' field instead
498 of the normal type code. */
499
500 #define X0WINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtwint)
501 #define X0INT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtint)
502 #define X0UINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtuint)
503 #define X0STR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtstr)
504 #define X0EXP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtx)
505 #define X0VEC(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtvec)
506 #define X0MODE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttype)
507 #define X0BITMAP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtbit)
508 #define X0TREE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttree)
509 #define X0BBDEF(RTX, N) (RTL_CHECK1 (RTX, N, '0').bb)
510 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
511 #define X0CSELIB(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_cselib)
512 #define X0MEMATTR(RTX, N) (RTL_CHECKC1 (RTX, N, MEM).rtmem)
513 #define X0REGATTR(RTX, N) (RTL_CHECKC1 (RTX, N, REG).rtreg)
514
515 #define XCWINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtwint)
516 #define XCINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtint)
517 #define XCUINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtuint)
518 #define XCSTR(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtstr)
519 #define XCEXP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtx)
520 #define XCVEC(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtvec)
521 #define XCMODE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttype)
522 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtbit)
523 #define XCTREE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttree)
524 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).bb)
525 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_addr_diff_vec_flags)
526 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cselib)
527
528 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
529 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
530
531 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2 (RTX, N, C1, C2).rtx)
532 \f
533 /* ACCESS MACROS for particular fields of insns. */
534
535 /* Determines whether X is an insn. */
536 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
537
538 /* Holds a unique number for each insn.
539 These are not necessarily sequentially increasing. */
540 #define INSN_UID(INSN) XINT (INSN, 0)
541
542 /* Chain insns together in sequence. */
543 #define PREV_INSN(INSN) XEXP (INSN, 1)
544 #define NEXT_INSN(INSN) XEXP (INSN, 2)
545
546 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
547 #define INSN_SCOPE(INSN) XTREE (INSN, 4)
548 /* The body of an insn. */
549 #define PATTERN(INSN) XEXP (INSN, 5)
550
551 /* Code number of instruction, from when it was recognized.
552 -1 means this instruction has not been recognized yet. */
553 #define INSN_CODE(INSN) XINT (INSN, 6)
554
555 /* Set up in flow.c; empty before then.
556 Holds a chain of INSN_LIST rtx's whose first operands point at
557 previous insns with direct data-flow connections to this one.
558 That means that those insns set variables whose next use is in this insn.
559 They are always in the same basic block as this insn. */
560 #define LOG_LINKS(INSN) XEXP(INSN, 7)
561
562 #define RTX_INTEGRATED_P(RTX) \
563 (RTL_FLAG_CHECK8("RTX_INTEGRATED_P", (RTX), INSN, CALL_INSN, \
564 JUMP_INSN, INSN_LIST, BARRIER, CODE_LABEL, CONST, \
565 NOTE)->integrated)
566 #define RTX_UNCHANGING_P(RTX) \
567 (RTL_FLAG_CHECK3("RTX_UNCHANGING_P", (RTX), REG, MEM, CONCAT)->unchanging)
568 #define RTX_FRAME_RELATED_P(RTX) \
569 (RTL_FLAG_CHECK5("RTX_FRAME_RELATED_P", (RTX), INSN, CALL_INSN, \
570 JUMP_INSN, BARRIER, SET)->frame_related)
571
572 /* 1 if RTX is an insn that has been deleted. */
573 #define INSN_DELETED_P(RTX) \
574 (RTL_FLAG_CHECK6("INSN_DELETED_P", (RTX), INSN, CALL_INSN, JUMP_INSN, \
575 CODE_LABEL, BARRIER, NOTE)->volatil)
576
577 /* 1 if RTX is a call to a const or pure function. */
578 #define CONST_OR_PURE_CALL_P(RTX) \
579 (RTL_FLAG_CHECK3("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN, NOTE, \
580 EXPR_LIST)->unchanging)
581
582 /* 1 if RTX is a call_insn for a sibling call. */
583 #define SIBLING_CALL_P(RTX) \
584 (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
585
586 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch. */
587 #define INSN_ANNULLED_BRANCH_P(RTX) \
588 (RTL_FLAG_CHECK3("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN, CALL_INSN, INSN)->unchanging)
589
590 /* 1 if RTX is an insn that is dead code. Valid only for dead-code
591 elimination phase. */
592 #define INSN_DEAD_CODE_P(RTX) \
593 (RTL_FLAG_CHECK3("INSN_DEAD_CODE_P", (RTX), INSN, CALL_INSN, JUMP_INSN)->in_struct)
594
595 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
596 If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
597 executed if the branch is taken. For annulled branches with this bit
598 clear, the insn should be executed only if the branch is not taken. */
599 #define INSN_FROM_TARGET_P(RTX) \
600 (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
601
602 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
603
604 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
605
606 /* Holds a list of notes on what this insn does to various REGs.
607 It is a chain of EXPR_LIST rtx's, where the second operand is the
608 chain pointer and the first operand is the REG being described.
609 The mode field of the EXPR_LIST contains not a real machine mode
610 but a value from enum reg_note. */
611
612 #define REG_NOTES(INSN) XEXP(INSN, 8)
613
614 /* Don't forget to change reg_note_name in rtl.c. */
615 enum reg_note
616 {
617 /* The value in REG dies in this insn (i.e., it is not needed past
618 this insn). If REG is set in this insn, the REG_DEAD note may,
619 but need not, be omitted. */
620 REG_DEAD = 1,
621
622 /* The REG is autoincremented or autodecremented. */
623 REG_INC,
624
625 /* Describes the insn as a whole; it says that the insn sets a register
626 to a constant value or to be equivalent to a memory address. If the
627 register is spilled to the stack then the constant value should be
628 substituted for it. The contents of the REG_EQUIV is the constant
629 value or memory address, which may be different from the source of
630 the SET although it has the same value. A REG_EQUIV note may also
631 appear on an insn which copies a register parameter to a pseudo-register,
632 if there is a memory address which could be used to hold that
633 pseudo-register throughout the function. */
634 REG_EQUIV,
635
636 /* Like REG_EQUIV except that the destination is only momentarily equal
637 to the specified rtx. Therefore, it cannot be used for substitution;
638 but it can be used for cse. */
639 REG_EQUAL,
640
641 /* The register set in this insn held 0 before the insn. The contents of
642 the note is the insn that stored the 0. If that insn is deleted or
643 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
644 is actually an INSN_LIST, not an EXPR_LIST. */
645 REG_WAS_0,
646
647 /* This insn copies the return-value of a library call out of the hard reg
648 for return values. This note is actually an INSN_LIST and it points to
649 the first insn involved in setting up arguments for the call. flow.c
650 uses this to delete the entire library call when its result is dead. */
651 REG_RETVAL,
652
653 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
654 and points at the one that has the REG_RETVAL. This note is also an
655 INSN_LIST. */
656 REG_LIBCALL,
657
658 /* The register is always nonnegative during the containing loop. This is
659 used in branches so that decrement and branch instructions terminating
660 on zero can be matched. There must be an insn pattern in the md file
661 named `decrement_and_branch_until_zero' or else this will never be added
662 to any instructions. */
663 REG_NONNEG,
664
665 /* There is no conflict *after this insn* between the register in the note
666 and the destination of this insn. */
667 REG_NO_CONFLICT,
668
669 /* Identifies a register set in this insn and never used. */
670 REG_UNUSED,
671
672 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
673 respectively. Normally, these are required to be consecutive insns, but
674 we permit putting a cc0-setting insn in the delay slot of a branch as
675 long as only one copy of the insn exists. In that case, these notes
676 point from one to the other to allow code generation to determine what
677 any require information and to properly update CC_STATUS. These notes
678 are INSN_LISTs. */
679 REG_CC_SETTER, REG_CC_USER,
680
681 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
682 CODE_LABEL contained in the REG_LABEL note is used by the insn.
683 This note is an INSN_LIST. */
684 REG_LABEL,
685
686 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
687 write-after-read and write-after-write dependencies respectively.
688 Data dependencies, which are the only type of LOG_LINK created by
689 flow, are represented by a 0 reg note kind. */
690 REG_DEP_ANTI, REG_DEP_OUTPUT,
691
692 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.
693 It has an integer value. For jumps, it is the probability that this is a
694 taken branch. For calls, it is the probability that this call won't
695 return. */
696 REG_BR_PROB,
697
698 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
699 the first insn after each CALL_INSN. It indicates how many times this
700 block was executed. */
701 REG_EXEC_COUNT,
702
703 /* Attached to a call insn; indicates that the call is malloc-like and
704 that the pointer returned cannot alias anything else. */
705 REG_NOALIAS,
706
707 /* Used to optimize rtl generated by dynamic stack allocations for targets
708 where SETJMP_VIA_SAVE_AREA is true. */
709 REG_SAVE_AREA,
710
711 /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
712 CONCAT of two integer value. First specifies the branch predictor
713 that added the note, second specifies the predicted hitrate of branch
714 in the same format as REG_BR_PROB note uses. */
715 REG_BR_PRED,
716
717 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
718 for DWARF to interpret what they imply. The attached rtx is used
719 instead of intuition. */
720 REG_FRAME_RELATED_EXPR,
721
722 /* Indicates that REG holds the exception context for the function.
723 This context is shared by inline functions, so the code to acquire
724 the real exception context is delayed until after inlining. */
725 REG_EH_CONTEXT,
726
727 /* Indicates what exception region an INSN belongs in. This is used to
728 indicate what region to which a call may throw. REGION 0 indicates
729 that a call cannot throw at all. REGION -1 indicates that it cannot
730 throw, nor will it execute a non-local goto. */
731 REG_EH_REGION,
732
733 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
734 REG_SAVE_NOTE,
735
736 /* Indicates that this insn (which is part of the prologue) computes
737 a value which might not be used later, and if so it's OK to delete
738 the insn. Normally, deleting any insn in the prologue is an error.
739 At present the parameter is unused and set to (const_int 0). */
740 REG_MAYBE_DEAD,
741
742 /* Indicates that a call does not return. */
743 REG_NORETURN,
744
745 /* Indicates that an indirect jump is a non-local goto instead of a
746 computed goto. */
747 REG_NON_LOCAL_GOTO,
748
749 /* This kind of note is generated at each to `setjmp',
750 and similar functions that can return twice. */
751 REG_SETJMP,
752
753 /* Indicate calls that always returns. */
754 REG_ALWAYS_RETURN,
755
756 /* Indicate that the memory load references a vtable. The expression
757 is of the form (plus (symbol_ref vtable_sym) (const_int offset)). */
758 REG_VTABLE_REF
759 };
760
761 /* The base value for branch probability notes. */
762 #define REG_BR_PROB_BASE 10000
763
764 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
765 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
766 #define PUT_REG_NOTE_KIND(LINK, KIND) \
767 PUT_MODE (LINK, (enum machine_mode) (KIND))
768
769 /* Names for REG_NOTE's in EXPR_LIST insn's. */
770
771 extern const char * const reg_note_name[];
772 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
773
774 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
775 USE and CLOBBER expressions.
776 USE expressions list the registers filled with arguments that
777 are passed to the function.
778 CLOBBER expressions document the registers explicitly clobbered
779 by this CALL_INSN.
780 Pseudo registers can not be mentioned in this list. */
781 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 9)
782
783 /* The label-number of a code-label. The assembler label
784 is made from `L' and the label-number printed in decimal.
785 Label numbers are unique in a compilation. */
786 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
787
788 #define LINE_NUMBER NOTE
789
790 /* In a NOTE that is a line number, this is a string for the file name that the
791 line is in. We use the same field to record block numbers temporarily in
792 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
793 between ints and pointers if we use a different macro for the block number.)
794 */
795
796 #define NOTE_SOURCE_FILE(INSN) XCSTR (INSN, 4, NOTE)
797 #define NOTE_BLOCK(INSN) XCTREE (INSN, 4, NOTE)
798 #define NOTE_EH_HANDLER(INSN) XCINT (INSN, 4, NOTE)
799 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
800 #define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE)
801 #define NOTE_PREDICTION(INSN) XCINT (INSN, 4, NOTE)
802 #define NOTE_PRECONDITIONED(INSN) XCINT (INSN, 4, NOTE)
803
804 /* In a NOTE that is a line number, this is the line number.
805 Other kinds of NOTEs are identified by negative numbers here. */
806 #define NOTE_LINE_NUMBER(INSN) XCINT (INSN, 5, NOTE)
807
808 /* Nonzero if INSN is a note marking the beginning of a basic block. */
809 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
810 (GET_CODE (INSN) == NOTE \
811 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
812
813 /* Algorithm and flags for prediction. */
814 #define NOTE_PREDICTION_ALG(INSN) (XCINT(INSN, 4, NOTE)>>8)
815 #define NOTE_PREDICTION_FLAGS(INSN) (XCINT(INSN, 4, NOTE)&0xff)
816 #define NOTE_PREDICT(ALG,FLAGS) ((ALG<<8)+(FLAGS))
817
818 /* Codes that appear in the NOTE_LINE_NUMBER field
819 for kinds of notes that are not line numbers.
820
821 Notice that we do not try to use zero here for any of
822 the special note codes because sometimes the source line
823 actually can be zero! This happens (for example) when we
824 are generating code for the per-translation-unit constructor
825 and destructor routines for some C++ translation unit.
826
827 If you should change any of the following values, or if you
828 should add a new value here, don't forget to change the
829 note_insn_name array in rtl.c. */
830
831 enum insn_note
832 {
833 /* Keep all of these numbers negative. Adjust as needed. */
834 NOTE_INSN_BIAS = -100,
835
836 /* This note is used to get rid of an insn
837 when it isn't safe to patch the insn out of the chain. */
838 NOTE_INSN_DELETED,
839
840 /* These are used to mark the beginning and end of a lexical block.
841 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
842 NOTE_INSN_BLOCK_BEG,
843 NOTE_INSN_BLOCK_END,
844
845 /* These mark the extremes of a loop. */
846 NOTE_INSN_LOOP_BEG,
847 NOTE_INSN_LOOP_END,
848
849 /* Generated at the place in a loop that `continue' jumps to. */
850 NOTE_INSN_LOOP_CONT,
851 /* Generated at the start of a duplicated exit test. */
852 NOTE_INSN_LOOP_VTOP,
853
854 /* Generated at the end of a conditional at the top of the loop.
855 This is used to perform a lame form of loop rotation in lieu
856 of actually understanding the loop structure. The note is
857 discarded after rotation is complete. */
858 NOTE_INSN_LOOP_END_TOP_COND,
859
860 /* This kind of note is generated at the end of the function body,
861 just before the return insn or return label. In an optimizing
862 compilation it is deleted by the first jump optimization, after
863 enabling that optimizer to determine whether control can fall
864 off the end of the function body without a return statement. */
865 NOTE_INSN_FUNCTION_END,
866
867 /* This marks the point immediately after the last prologue insn. */
868 NOTE_INSN_PROLOGUE_END,
869
870 /* This marks the point immediately prior to the first epilogue insn. */
871 NOTE_INSN_EPILOGUE_BEG,
872
873 /* Generated in place of user-declared labels when they are deleted. */
874 NOTE_INSN_DELETED_LABEL,
875
876 /* This note indicates the start of the real body of the function,
877 i.e. the point just after all of the parms have been moved into
878 their homes, etc. */
879 NOTE_INSN_FUNCTION_BEG,
880
881 /* These note where exception handling regions begin and end.
882 Uses NOTE_EH_HANDLER to identify the region in question. */
883 NOTE_INSN_EH_REGION_BEG,
884 NOTE_INSN_EH_REGION_END,
885
886 /* Generated whenever a duplicate line number note is output. For example,
887 one is output after the end of an inline function, in order to prevent
888 the line containing the inline call from being counted twice in gcov. */
889 NOTE_INSN_REPEATED_LINE_NUMBER,
890
891 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
892 NOTE_INSN_BASIC_BLOCK,
893
894 /* Record the expected value of a register at a location. Uses
895 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
896 NOTE_INSN_EXPECTED_VALUE,
897
898 /* Record a prediction. Uses NOTE_PREDICTION. */
899 NOTE_INSN_PREDICTION,
900
901 NOTE_INSN_MAX
902 };
903
904 /* Names for NOTE insn's other than line numbers. */
905
906 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
907 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
908 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
909
910 /* The name of a label, in case it corresponds to an explicit label
911 in the input source code. */
912 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
913
914 /* In jump.c, each label contains a count of the number
915 of LABEL_REFs that point at it, so unused labels can be deleted. */
916 #define LABEL_NUSES(RTX) XCINT (RTX, 4, CODE_LABEL)
917
918 /* Labels carry a two-bit field composed of the ->jump and ->call
919 bits. This field indicates whether the label is an alternate
920 entry point, and if so, what kind. */
921 enum label_kind
922 {
923 LABEL_NORMAL = 0, /* ordinary label */
924 LABEL_STATIC_ENTRY, /* alternate entry point, not exported */
925 LABEL_GLOBAL_ENTRY, /* alternate entry point, exported */
926 LABEL_WEAK_ENTRY /* alternate entry point, exported as weak symbol */
927 };
928
929 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
930
931 /* Retrieve the kind of LABEL. */
932 #define LABEL_KIND(LABEL) __extension__ \
933 ({ rtx const _label = (LABEL); \
934 if (GET_CODE (_label) != CODE_LABEL) \
935 rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__, \
936 __FUNCTION__); \
937 (enum label_kind) ((_label->jump << 1) | _label->call); })
938
939 /* Set the kind of LABEL. */
940 #define SET_LABEL_KIND(LABEL, KIND) do { \
941 rtx _label = (LABEL); \
942 unsigned int _kind = (KIND); \
943 if (GET_CODE (_label) != CODE_LABEL) \
944 rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
945 __FUNCTION__); \
946 _label->jump = ((_kind >> 1) & 1); \
947 _label->call = (_kind & 1); \
948 } while (0)
949
950 #else
951
952 /* Retrieve the kind of LABEL. */
953 #define LABEL_KIND(LABEL) \
954 ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
955
956 /* Set the kind of LABEL. */
957 #define SET_LABEL_KIND(LABEL, KIND) do { \
958 rtx _label = (LABEL); \
959 unsigned int _kind = (KIND); \
960 _label->jump = ((_kind >> 1) & 1); \
961 _label->call = (_kind & 1); \
962 } while (0)
963
964 #endif /* rtl flag checking */
965
966 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
967
968 /* The original regno this ADDRESSOF was built for. */
969 #define ADDRESSOF_REGNO(RTX) XCUINT (RTX, 1, ADDRESSOF)
970
971 /* The variable in the register we took the address of. */
972 #define ADDRESSOF_DECL(RTX) XCTREE (RTX, 2, ADDRESSOF)
973
974 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
975 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
976 be decremented and possibly the label can be deleted. */
977 #define JUMP_LABEL(INSN) XCEXP (INSN, 9, JUMP_INSN)
978
979 /* Once basic blocks are found in flow.c,
980 each CODE_LABEL starts a chain that goes through
981 all the LABEL_REFs that jump to that label.
982 The chain eventually winds up at the CODE_LABEL: it is circular. */
983 #define LABEL_REFS(LABEL) XCEXP (LABEL, 5, CODE_LABEL)
984 \f
985 /* This is the field in the LABEL_REF through which the circular chain
986 of references to a particular label is linked.
987 This chain is set up in flow.c. */
988
989 #define LABEL_NEXTREF(REF) XCEXP (REF, 1, LABEL_REF)
990
991 /* Once basic blocks are found in flow.c,
992 Each LABEL_REF points to its containing instruction with this field. */
993
994 #define CONTAINING_INSN(RTX) XCEXP (RTX, 2, LABEL_REF)
995
996 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
997 the number the register originally had; for a pseudo register turned into
998 a hard reg this will hold the old pseudo register number. */
999
1000 #define REGNO(RTX) XCUINT (RTX, 0, REG)
1001 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
1002
1003 /* 1 if RTX is a reg or parallel that is the current function's return
1004 value. */
1005 #define REG_FUNCTION_VALUE_P(RTX) \
1006 (RTL_FLAG_CHECK2("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->integrated)
1007
1008 /* 1 if RTX is a reg that corresponds to a variable declared by the user. */
1009 #define REG_USERVAR_P(RTX) \
1010 (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
1011
1012 /* 1 if RTX is a reg that holds a pointer value. */
1013 #define REG_POINTER(RTX) \
1014 (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
1015
1016 /* 1 if the given register REG corresponds to a hard register. */
1017 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1018
1019 /* 1 if the given register number REG_NO corresponds to a hard register. */
1020 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1021
1022 /* For a CONST_INT rtx, INTVAL extracts the integer. */
1023
1024 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
1025
1026 /* For a CONST_DOUBLE:
1027 For a DImode, there are two integers CONST_DOUBLE_LOW is the
1028 low-order word and ..._HIGH the high-order.
1029 For a float, there is a REAL_VALUE_TYPE structure, and
1030 CONST_DOUBLE_REAL_VALUE(r) is a pointer to it. */
1031 #define CONST_DOUBLE_LOW(r) XCWINT (r, 0, CONST_DOUBLE)
1032 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 1, CONST_DOUBLE)
1033 #define CONST_DOUBLE_REAL_VALUE(r) ((struct real_value *)&CONST_DOUBLE_LOW(r))
1034
1035 /* For a CONST_VECTOR, return element #n. */
1036 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1037
1038 /* For a CONST_VECTOR, return the number of elements in a vector. */
1039 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1040
1041 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1042 SUBREG_BYTE extracts the byte-number. */
1043
1044 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1045 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1046
1047 /* in rtlanal.c */
1048 extern unsigned int subreg_lsb PARAMS ((rtx));
1049 extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
1050 enum machine_mode,
1051 unsigned int,
1052 enum machine_mode));
1053 extern unsigned int subreg_regno PARAMS ((rtx));
1054
1055 /* 1 if RTX is a subreg containing a reg that is already known to be
1056 sign- or zero-extended from the mode of the subreg to the mode of
1057 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1058 extension.
1059
1060 When used as a LHS, is means that this extension must be done
1061 when assigning to SUBREG_REG. */
1062
1063 #define SUBREG_PROMOTED_VAR_P(RTX) \
1064 (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1065
1066 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL) \
1067 do { \
1068 rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
1069 if ((VAL) < 0) \
1070 _rtx->volatil = 1; \
1071 else { \
1072 _rtx->volatil = 0; \
1073 _rtx->unchanging = (VAL); \
1074 } \
1075 } while (0)
1076 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1077 ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1078 ? -1 : (RTX)->unchanging)
1079
1080 /* Access various components of an ASM_OPERANDS rtx. */
1081
1082 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1083 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1084 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1085 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1086 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1087 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1088 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1089 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1090 XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1091 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1092 XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1093 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
1094 GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1095 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR (RTX, 5, ASM_OPERANDS)
1096 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT (RTX, 6, ASM_OPERANDS)
1097
1098 /* 1 if RTX is a mem and we should keep the alias set for this mem
1099 unchanged when we access a component. Set to 1, or example, when we
1100 are already in a non-addressable component of an aggregate. */
1101 #define MEM_KEEP_ALIAS_SET_P(RTX) \
1102 (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1103
1104 /* 1 if RTX is a mem or asm_operand for a volatile reference. */
1105 #define MEM_VOLATILE_P(RTX) \
1106 (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS, \
1107 ASM_INPUT)->volatil)
1108
1109 /* 1 if RTX is a mem that refers to an aggregate, either to the
1110 aggregate itself of to a field of the aggregate. If zero, RTX may
1111 or may not be such a reference. */
1112 #define MEM_IN_STRUCT_P(RTX) \
1113 (RTL_FLAG_CHECK1("MEM_IN_STRUCT_P", (RTX), MEM)->in_struct)
1114
1115 /* 1 if RTX is a mem that refers to a scalar. If zero, RTX may or may
1116 not refer to a scalar. */
1117 #define MEM_SCALAR_P(RTX) \
1118 (RTL_FLAG_CHECK1("MEM_SCALAR_P", (RTX), MEM)->frame_related)
1119
1120 /* If VAL is nonzero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
1121 RTX. Otherwise, vice versa. Use this macro only when you are
1122 *sure* that you know that the MEM is in a structure, or is a
1123 scalar. VAL is evaluated only once. */
1124 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
1125 do { \
1126 if (VAL) \
1127 { \
1128 MEM_IN_STRUCT_P (RTX) = 1; \
1129 MEM_SCALAR_P (RTX) = 0; \
1130 } \
1131 else \
1132 { \
1133 MEM_IN_STRUCT_P (RTX) = 0; \
1134 MEM_SCALAR_P (RTX) = 1; \
1135 } \
1136 } while (0)
1137
1138 /* The memory attribute block. We provide access macros for each value
1139 in the block and provide defaults if none specified. */
1140 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1141
1142 /* The register attribute block. We provide access macros for each value
1143 in the block and provide defaults if none specified. */
1144 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1145
1146 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
1147 set, and may alias anything. Otherwise, the MEM can only alias
1148 MEMs in the same alias set. This value is set in a
1149 language-dependent manner in the front-end, and should not be
1150 altered in the back-end. These set numbers are tested for zero,
1151 and compared for equality; they have no other significance. In
1152 some front-ends, these numbers may correspond in some way to types,
1153 or other language-level entities, but they need not, and the
1154 back-end makes no such assumptions. */
1155 #define MEM_ALIAS_SET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->alias)
1156
1157 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1158 refer to part of a DECL. It may also be a COMPONENT_REF. */
1159 #define MEM_EXPR(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->expr)
1160
1161 /* For a MEM rtx, the offset from the start of MEM_EXPR, if known, as a
1162 RTX that is always a CONST_INT. */
1163 #define MEM_OFFSET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->offset)
1164
1165 /* For a MEM rtx, the size in bytes of the MEM, if known, as an RTX that
1166 is always a CONST_INT. */
1167 #define MEM_SIZE(RTX) \
1168 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->size \
1169 : GET_MODE (RTX) != BLKmode ? GEN_INT (GET_MODE_SIZE (GET_MODE (RTX))) \
1170 : 0)
1171
1172 /* For a MEM rtx, the alignment in bits. We can use the alignment of the
1173 mode as a default when STRICT_ALIGNMENT, but not if not. */
1174 #define MEM_ALIGN(RTX) \
1175 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->align \
1176 : (STRICT_ALIGNMENT && GET_MODE (RTX) != BLKmode \
1177 ? GET_MODE_ALIGNMENT (GET_MODE (RTX)) : BITS_PER_UNIT))
1178
1179 /* For a REG rtx, the decl it is known to refer to, if it is known to
1180 refer to part of a DECL. */
1181 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1182
1183 /* For a MEM rtx, the offset from the start of MEM_DECL, if known, as a
1184 RTX that is always a CONST_INT. */
1185 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1186
1187 /* Copy the attributes that apply to memory locations from RHS to LHS. */
1188 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
1189 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
1190 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
1191 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
1192 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS), \
1193 MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS), \
1194 MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1195
1196 /* 1 if RTX is a label_ref to a label outside the loop containing the
1197 reference. */
1198 #define LABEL_OUTSIDE_LOOP_P(RTX) \
1199 (RTL_FLAG_CHECK1("LABEL_OUTSIDE_LOOP_P", (RTX), LABEL_REF)->in_struct)
1200
1201 /* 1 if RTX is a label_ref for a nonlocal label. */
1202 /* Likewise in an expr_list for a reg_label note. */
1203 #define LABEL_REF_NONLOCAL_P(RTX) \
1204 (RTL_FLAG_CHECK2("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF, \
1205 REG_LABEL)->volatil)
1206
1207 /* 1 if RTX is a code_label that should always be considered to be needed. */
1208 #define LABEL_PRESERVE_P(RTX) \
1209 (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1210
1211 /* 1 if RTX is a reg that is used only in an exit test of a loop. */
1212 #define REG_LOOP_TEST_P(RTX) \
1213 (RTL_FLAG_CHECK1("REG_LOOP_TEST_P", (RTX), REG)->in_struct)
1214
1215 /* During sched, 1 if RTX is an insn that must be scheduled together
1216 with the preceding insn. */
1217 #define SCHED_GROUP_P(RTX) \
1218 (RTL_FLAG_CHECK3("SCHED_GROUP_P", (RTX), INSN, JUMP_INSN, CALL_INSN \
1219 )->in_struct)
1220
1221 /* For a SET rtx, SET_DEST is the place that is set
1222 and SET_SRC is the value it is set to. */
1223 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1224 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1225 #define SET_IS_RETURN_P(RTX) \
1226 (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1227
1228 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
1229 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1230 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1231
1232 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1233 conditionally executing the code on, COND_EXEC_CODE is the code
1234 to execute if the condition is true. */
1235 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1236 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1237
1238 /* 1 if RTX is a symbol_ref that addresses this function's constants pool. */
1239 #define CONSTANT_POOL_ADDRESS_P(RTX) \
1240 (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1241
1242 /* 1 if RTX is a symbol_ref that addresses this function's string constant
1243 pool */
1244 #define STRING_POOL_ADDRESS_P(RTX) \
1245 (RTL_FLAG_CHECK1("STRING_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->frame_related)
1246
1247 /* Used if RTX is a symbol_ref, for machine-specific purposes. */
1248 #define SYMBOL_REF_FLAG(RTX) \
1249 (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1250
1251 /* 1 if RTX is a symbol_ref that has been the library function in
1252 emit_library_call. */
1253 #define SYMBOL_REF_USED(RTX) \
1254 (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1255
1256 /* 1 if RTX is a symbol_ref for a weak symbol. */
1257 #define SYMBOL_REF_WEAK(RTX) \
1258 (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->integrated)
1259
1260 /* Define a macro to look for REG_INC notes,
1261 but save time on machines where they never exist. */
1262
1263 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1264 #define FIND_REG_INC_NOTE(INSN, REG) \
1265 ((REG) != NULL_RTX && REG_P ((REG)) \
1266 ? find_regno_note ((INSN), REG_INC, REGNO (REG)) \
1267 : find_reg_note ((INSN), REG_INC, (REG)))
1268 #else
1269 #define FIND_REG_INC_NOTE(INSN, REG) 0
1270 #endif
1271
1272 /* Indicate whether the machine has any sort of auto increment addressing.
1273 If not, we can avoid checking for REG_INC notes. */
1274
1275 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1276 #define AUTO_INC_DEC
1277 #endif
1278
1279 #ifndef HAVE_PRE_INCREMENT
1280 #define HAVE_PRE_INCREMENT 0
1281 #endif
1282
1283 #ifndef HAVE_PRE_DECREMENT
1284 #define HAVE_PRE_DECREMENT 0
1285 #endif
1286
1287 #ifndef HAVE_POST_INCREMENT
1288 #define HAVE_POST_INCREMENT 0
1289 #endif
1290
1291 #ifndef HAVE_POST_DECREMENT
1292 #define HAVE_POST_DECREMENT 0
1293 #endif
1294
1295 #ifndef HAVE_POST_MODIFY_DISP
1296 #define HAVE_POST_MODIFY_DISP 0
1297 #endif
1298
1299 #ifndef HAVE_POST_MODIFY_REG
1300 #define HAVE_POST_MODIFY_REG 0
1301 #endif
1302
1303 #ifndef HAVE_PRE_MODIFY_DISP
1304 #define HAVE_PRE_MODIFY_DISP 0
1305 #endif
1306
1307 #ifndef HAVE_PRE_MODIFY_REG
1308 #define HAVE_PRE_MODIFY_REG 0
1309 #endif
1310
1311
1312 /* Some architectures do not have complete pre/post increment/decrement
1313 instruction sets, or only move some modes efficiently. These macros
1314 allow us to tune autoincrement generation. */
1315
1316 #ifndef USE_LOAD_POST_INCREMENT
1317 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1318 #endif
1319
1320 #ifndef USE_LOAD_POST_DECREMENT
1321 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1322 #endif
1323
1324 #ifndef USE_LOAD_PRE_INCREMENT
1325 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1326 #endif
1327
1328 #ifndef USE_LOAD_PRE_DECREMENT
1329 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1330 #endif
1331
1332 #ifndef USE_STORE_POST_INCREMENT
1333 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1334 #endif
1335
1336 #ifndef USE_STORE_POST_DECREMENT
1337 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1338 #endif
1339
1340 #ifndef USE_STORE_PRE_INCREMENT
1341 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1342 #endif
1343
1344 #ifndef USE_STORE_PRE_DECREMENT
1345 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1346 #endif
1347
1348 /* Determine if the insn is a PHI node. */
1349 #define PHI_NODE_P(X) \
1350 ((X) && GET_CODE (X) == INSN \
1351 && GET_CODE (PATTERN (X)) == SET \
1352 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1353 \f
1354 /* Nonzero if we need to distinguish between the return value of this function
1355 and the return value of a function called by this function. This helps
1356 integrate.c.
1357 This is 1 until after the rtl generation pass. */
1358 extern int rtx_equal_function_value_matters;
1359
1360 /* Nonzero when we are generating CONCATs. */
1361 extern int generating_concat_p;
1362
1363 /* Generally useful functions. */
1364
1365 /* In expmed.c */
1366 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1367
1368 #define plus_constant(X, C) plus_constant_wide ((X), (HOST_WIDE_INT) (C))
1369
1370 /* In builtins.c */
1371 extern rtx expand_builtin_expect_jump PARAMS ((tree, rtx, rtx));
1372 extern void purge_builtin_constant_p PARAMS ((void));
1373
1374 /* In explow.c */
1375 extern void set_stack_check_libfunc PARAMS ((rtx));
1376 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1377 enum machine_mode));
1378 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1379 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1380 extern void optimize_save_area_alloca PARAMS ((rtx));
1381
1382 /* In emit-rtl.c */
1383 extern rtx gen_rtx PARAMS ((enum rtx_code,
1384 enum machine_mode, ...));
1385 extern rtvec gen_rtvec PARAMS ((int, ...));
1386 extern rtx copy_insn_1 PARAMS ((rtx));
1387 extern rtx copy_insn PARAMS ((rtx));
1388 extern rtx gen_int_mode PARAMS ((HOST_WIDE_INT,
1389 enum machine_mode));
1390 extern rtx emit_copy_of_insn_after PARAMS ((rtx, rtx));
1391 extern void set_reg_attrs_from_mem PARAMS ((rtx, rtx));
1392 extern void set_mem_attrs_from_reg PARAMS ((rtx, rtx));
1393
1394 /* In rtl.c */
1395 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1396 extern rtvec rtvec_alloc PARAMS ((int));
1397 extern rtx copy_rtx PARAMS ((rtx));
1398
1399 /* In emit-rtl.c */
1400 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1401
1402 /* In rtl.c */
1403 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1404 extern rtx shallow_copy_rtx PARAMS ((rtx));
1405 extern int rtx_equal_p PARAMS ((rtx, rtx));
1406
1407 /* In emit-rtl.c */
1408 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1409 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1410 extern rtx gen_rtx_REG_offset PARAMS ((rtx, enum machine_mode,
1411 unsigned int, int));
1412 extern rtx gen_label_rtx PARAMS ((void));
1413 extern int subreg_hard_regno PARAMS ((rtx, int));
1414 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1415 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1416
1417 /* In cse.c */
1418 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1419
1420 /* In emit-rtl.c */
1421 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1422 extern rtx gen_highpart_mode PARAMS ((enum machine_mode,
1423 enum machine_mode, rtx));
1424 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1425 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1426 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1427 enum machine_mode));
1428 extern rtx constant_subword PARAMS ((rtx, int,
1429 enum machine_mode));
1430
1431 /* In emit-rtl.c */
1432 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1433 enum machine_mode));
1434 extern int subreg_lowpart_p PARAMS ((rtx));
1435 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1436 enum machine_mode));
1437 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1438 enum machine_mode));
1439 extern rtx make_safe_from PARAMS ((rtx, rtx));
1440 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1441 extern rtx get_insns PARAMS ((void));
1442 extern const char *get_insn_name PARAMS ((int));
1443 extern rtx get_last_insn PARAMS ((void));
1444 extern rtx get_last_insn_anywhere PARAMS ((void));
1445 extern rtx get_first_nonnote_insn PARAMS ((void));
1446 extern rtx get_last_nonnote_insn PARAMS ((void));
1447 extern void start_sequence PARAMS ((void));
1448 extern void push_to_sequence PARAMS ((rtx));
1449 extern void end_sequence PARAMS ((void));
1450 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1451 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1452
1453 /* In varasm.c */
1454 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1455 extern rtx mem_for_const_double PARAMS ((rtx));
1456 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1457
1458 /* In varasm.c */
1459 extern rtx get_pool_constant PARAMS ((rtx));
1460 extern rtx get_pool_constant_mark PARAMS ((rtx, bool *));
1461 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1462 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1463 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1464 extern int get_pool_offset PARAMS ((rtx));
1465 extern rtx simplify_subtraction PARAMS ((rtx));
1466
1467 /* In function.c */
1468 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1469 HOST_WIDE_INT, int));
1470 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1471 HOST_WIDE_INT, int));
1472 extern rtx assign_stack_temp_for_type PARAMS ((enum machine_mode,
1473 HOST_WIDE_INT, int, tree));
1474 extern rtx assign_temp PARAMS ((tree, int, int, int));
1475 /* In emit-rtl.c */
1476 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1477 extern rtx emit_insn_before_scope PARAMS ((rtx, rtx, tree));
1478 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1479 extern rtx emit_jump_insn_before_scope PARAMS ((rtx, rtx, tree));
1480 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1481 extern rtx emit_call_insn_before_scope PARAMS ((rtx, rtx, tree));
1482 extern rtx emit_barrier_before PARAMS ((rtx));
1483 extern rtx emit_label_before PARAMS ((rtx, rtx));
1484 extern rtx emit_note_before PARAMS ((int, rtx));
1485 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1486 extern rtx emit_insn_after_scope PARAMS ((rtx, rtx, tree));
1487 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1488 extern rtx emit_jump_insn_after_scope PARAMS ((rtx, rtx, tree));
1489 extern rtx emit_call_insn_after PARAMS ((rtx, rtx));
1490 extern rtx emit_call_insn_after_scope PARAMS ((rtx, rtx, tree));
1491 extern rtx emit_barrier_after PARAMS ((rtx));
1492 extern rtx emit_label_after PARAMS ((rtx, rtx));
1493 extern rtx emit_note_after PARAMS ((int, rtx));
1494 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1495 extern rtx emit_insn PARAMS ((rtx));
1496 extern rtx emit_jump_insn PARAMS ((rtx));
1497 extern rtx emit_call_insn PARAMS ((rtx));
1498 extern rtx emit_label PARAMS ((rtx));
1499 extern rtx emit_barrier PARAMS ((void));
1500 extern rtx emit_line_note PARAMS ((const char *, int));
1501 extern rtx emit_note PARAMS ((const char *, int));
1502 extern rtx emit_line_note_force PARAMS ((const char *, int));
1503 extern rtx make_insn_raw PARAMS ((rtx));
1504 extern rtx previous_insn PARAMS ((rtx));
1505 extern rtx next_insn PARAMS ((rtx));
1506 extern rtx prev_nonnote_insn PARAMS ((rtx));
1507 extern rtx next_nonnote_insn PARAMS ((rtx));
1508 extern rtx prev_real_insn PARAMS ((rtx));
1509 extern rtx next_real_insn PARAMS ((rtx));
1510 extern rtx prev_active_insn PARAMS ((rtx));
1511 extern rtx next_active_insn PARAMS ((rtx));
1512 extern int active_insn_p PARAMS ((rtx));
1513 extern rtx prev_label PARAMS ((rtx));
1514 extern rtx next_label PARAMS ((rtx));
1515 extern rtx next_cc0_user PARAMS ((rtx));
1516 extern rtx prev_cc0_setter PARAMS ((rtx));
1517
1518 /* In cfglayout.c */
1519 extern tree choose_inner_scope PARAMS ((tree, tree));
1520
1521 /* In jump.c */
1522 extern rtx next_nondeleted_insn PARAMS ((rtx));
1523 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1524 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1525 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1526 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1527 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1528 extern void mark_jump_label PARAMS ((rtx, rtx, int));
1529 extern void cleanup_barriers PARAMS ((void));
1530
1531 /* In jump.c */
1532 extern bool squeeze_notes PARAMS ((rtx *, rtx *));
1533 extern rtx delete_related_insns PARAMS ((rtx));
1534 extern void delete_jump PARAMS ((rtx));
1535 extern void delete_barrier PARAMS ((rtx));
1536 extern rtx get_label_before PARAMS ((rtx));
1537 extern rtx get_label_after PARAMS ((rtx));
1538 extern rtx follow_jumps PARAMS ((rtx));
1539
1540 /* In recog.c */
1541 extern rtx *find_constant_term_loc PARAMS ((rtx *));
1542
1543 /* In emit-rtl.c */
1544 extern rtx try_split PARAMS ((rtx, rtx, int));
1545 extern int split_branch_probability;
1546
1547 /* In unknown file */
1548 extern rtx split_insns PARAMS ((rtx, rtx));
1549
1550 /* In simplify-rtx.c */
1551 extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1552 enum machine_mode, rtx,
1553 enum machine_mode));
1554 extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1555 enum machine_mode, rtx,
1556 rtx));
1557 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1558 enum machine_mode,
1559 enum machine_mode, rtx, rtx,
1560 rtx));
1561 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1562 enum machine_mode, rtx,
1563 rtx));
1564 extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1565 enum machine_mode,
1566 rtx, rtx));
1567 extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1568 enum machine_mode, rtx,
1569 enum machine_mode));
1570 extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1571 enum machine_mode,
1572 enum machine_mode,
1573 rtx, rtx, rtx));
1574 extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
1575 enum machine_mode,
1576 enum machine_mode,
1577 rtx, rtx));
1578 extern rtx simplify_subreg PARAMS ((enum machine_mode,
1579 rtx,
1580 enum machine_mode,
1581 unsigned int));
1582 extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1583 rtx,
1584 enum machine_mode,
1585 unsigned int));
1586 extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
1587 extern rtx simplify_rtx PARAMS ((rtx));
1588 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1589
1590 /* In function.c */
1591 extern rtx gen_mem_addressof PARAMS ((rtx, tree));
1592
1593 /* In regclass.c */
1594 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1595 unsigned int));
1596
1597 /* In emit-rtl.c */
1598 extern rtx set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1599
1600 /* Functions in rtlanal.c */
1601
1602 /* Single set is implemented as macro for performance reasons. */
1603 #define single_set(I) (INSN_P (I) \
1604 ? (GET_CODE (PATTERN (I)) == SET \
1605 ? PATTERN (I) : single_set_1 (I)) \
1606 : NULL_RTX)
1607 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1608
1609 extern int rtx_addr_can_trap_p PARAMS ((rtx));
1610 extern bool nonzero_address_p PARAMS ((rtx));
1611 extern int rtx_unstable_p PARAMS ((rtx));
1612 extern int rtx_varies_p PARAMS ((rtx, int));
1613 extern int rtx_addr_varies_p PARAMS ((rtx, int));
1614 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1615 extern rtx get_related_value PARAMS ((rtx));
1616 extern rtx get_jump_table_offset PARAMS ((rtx, rtx *));
1617 extern int global_reg_mentioned_p PARAMS ((rtx));
1618 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1619 extern int count_occurrences PARAMS ((rtx, rtx, int));
1620 extern int reg_referenced_p PARAMS ((rtx, rtx));
1621 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1622 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1623 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1624 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1625 extern int commutative_operand_precedence PARAMS ((rtx));
1626 extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
1627 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1628 extern int no_labels_between_p PARAMS ((rtx, rtx));
1629 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1630 extern int modified_in_p PARAMS ((rtx, rtx));
1631 extern int insn_dependent_p PARAMS ((rtx, rtx));
1632 extern int reg_set_p PARAMS ((rtx, rtx));
1633 extern rtx single_set_2 PARAMS ((rtx, rtx));
1634 extern int multiple_sets PARAMS ((rtx));
1635 extern int set_noop_p PARAMS ((rtx));
1636 extern int noop_move_p PARAMS ((rtx));
1637 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1638 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1639 rtx, rtx *));
1640 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1641 extern rtx set_of PARAMS ((rtx, rtx));
1642 extern void note_stores PARAMS ((rtx,
1643 void (*) (rtx, rtx, void *),
1644 void *));
1645 extern void note_uses PARAMS ((rtx *,
1646 void (*) (rtx *, void *),
1647 void *));
1648 extern rtx reg_set_last PARAMS ((rtx, rtx));
1649 extern int dead_or_set_p PARAMS ((rtx, rtx));
1650 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1651 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1652 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1653 unsigned int));
1654 extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
1655 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1656 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1657 unsigned int));
1658 extern int pure_call_p PARAMS ((rtx));
1659 extern void remove_note PARAMS ((rtx, rtx));
1660 extern int side_effects_p PARAMS ((rtx));
1661 extern int volatile_refs_p PARAMS ((rtx));
1662 extern int volatile_insn_p PARAMS ((rtx));
1663 extern int may_trap_p PARAMS ((rtx));
1664 extern int inequality_comparisons_p PARAMS ((rtx));
1665 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1666 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1667 int));
1668 extern int computed_jump_p PARAMS ((rtx));
1669 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1670 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1671 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1672 extern int auto_inc_p PARAMS ((rtx));
1673 extern int in_expr_list_p PARAMS ((rtx, rtx));
1674 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1675 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1676 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1677 extern rtx find_first_parameter_load PARAMS ((rtx, rtx));
1678 extern bool keep_with_call_p PARAMS ((rtx));
1679
1680 /* flow.c */
1681
1682 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1683
1684 /* lists.c */
1685
1686 void free_EXPR_LIST_list PARAMS ((rtx *));
1687 void free_INSN_LIST_list PARAMS ((rtx *));
1688 void free_EXPR_LIST_node PARAMS ((rtx));
1689 void free_INSN_LIST_node PARAMS ((rtx));
1690 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1691 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1692
1693 /* regclass.c */
1694
1695 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1696 Always at least 3, since the combiner could put that many togetherm
1697 and we want this to remain correct for all the remaining passes. */
1698
1699 extern int max_parallel;
1700
1701 /* Free up register info memory. */
1702 extern void free_reg_info PARAMS ((void));
1703
1704 /* recog.c */
1705 extern int asm_noperands PARAMS ((rtx));
1706 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1707 const char **,
1708 enum machine_mode *));
1709
1710 extern enum reg_class reg_preferred_class PARAMS ((int));
1711 extern enum reg_class reg_alternate_class PARAMS ((int));
1712
1713 extern rtx get_first_nonparm_insn PARAMS ((void));
1714
1715 extern void split_all_insns PARAMS ((int));
1716 extern void split_all_insns_noflow PARAMS ((void));
1717
1718 #define MAX_SAVED_CONST_INT 64
1719 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1720
1721 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1722 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1723 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1724 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1725 extern GTY(()) rtx const_true_rtx;
1726
1727 extern GTY(()) rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1728
1729 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1730 same as VOIDmode. */
1731
1732 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1733
1734 /* Likewise, for the constants 1 and 2. */
1735
1736 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1737 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1738
1739 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1740 is used to represent the frame pointer. This is because the
1741 hard frame pointer and the automatic variables are separated by an amount
1742 that cannot be determined until after register allocation. We can assume
1743 that in this case ELIMINABLE_REGS will be defined, one action of which
1744 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1745 #ifndef HARD_FRAME_POINTER_REGNUM
1746 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1747 #endif
1748
1749 /* Index labels for global_rtl. */
1750 enum global_rtl_index
1751 {
1752 GR_PC,
1753 GR_CC0,
1754 GR_STACK_POINTER,
1755 GR_FRAME_POINTER,
1756 /* For register elimination to work properly these hard_frame_pointer_rtx,
1757 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1758 the same register. */
1759 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1760 GR_ARG_POINTER = GR_FRAME_POINTER,
1761 #endif
1762 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1763 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1764 #else
1765 GR_HARD_FRAME_POINTER,
1766 #endif
1767 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1768 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1769 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1770 #else
1771 GR_ARG_POINTER,
1772 #endif
1773 #endif
1774 GR_VIRTUAL_INCOMING_ARGS,
1775 GR_VIRTUAL_STACK_ARGS,
1776 GR_VIRTUAL_STACK_DYNAMIC,
1777 GR_VIRTUAL_OUTGOING_ARGS,
1778 GR_VIRTUAL_CFA,
1779
1780 GR_MAX
1781 };
1782
1783 /* Pointers to standard pieces of rtx are stored here. */
1784 extern GTY(()) rtx global_rtl[GR_MAX];
1785
1786 /* Standard pieces of rtx, to be substituted directly into things. */
1787 #define pc_rtx (global_rtl[GR_PC])
1788 #define cc0_rtx (global_rtl[GR_CC0])
1789
1790 /* All references to certain hard regs, except those created
1791 by allocating pseudo regs into them (when that's possible),
1792 go through these unique rtx objects. */
1793 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1794 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1795 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1796 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1797
1798 extern GTY(()) rtx pic_offset_table_rtx;
1799 extern GTY(()) rtx struct_value_rtx;
1800 extern GTY(()) rtx struct_value_incoming_rtx;
1801 extern GTY(()) rtx static_chain_rtx;
1802 extern GTY(()) rtx static_chain_incoming_rtx;
1803 extern GTY(()) rtx return_address_pointer_rtx;
1804
1805 /* Include the RTL generation functions. */
1806
1807 #ifndef NO_GENRTL_H
1808 #include "genrtl.h"
1809 #endif
1810
1811 /* There are some RTL codes that require special attention; the
1812 generation functions included above do the raw handling. If you
1813 add to this list, modify special_rtx in gengenrtl.c as well. You
1814 should also modify gen_rtx to use the special function. */
1815
1816 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1817 extern rtx gen_rtx_CONST_VECTOR PARAMS ((enum machine_mode, rtvec));
1818 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1819 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, unsigned));
1820 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1821 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1822
1823 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1824
1825 /* We need the cast here to ensure that we get the same result both with
1826 and without prototypes. */
1827 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1828
1829 /* Virtual registers are used during RTL generation to refer to locations into
1830 the stack frame when the actual location isn't known until RTL generation
1831 is complete. The routine instantiate_virtual_regs replaces these with
1832 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1833 a constant. */
1834
1835 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1836
1837 /* This points to the first word of the incoming arguments passed on the stack,
1838 either by the caller or by the callee when pretending it was passed by the
1839 caller. */
1840
1841 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1842
1843 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1844
1845 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1846 variable on the stack. Otherwise, it points to the first variable on
1847 the stack. */
1848
1849 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1850
1851 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1852
1853 /* This points to the location of dynamically-allocated memory on the stack
1854 immediately after the stack pointer has been adjusted by the amount
1855 desired. */
1856
1857 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1858
1859 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1860
1861 /* This points to the location in the stack at which outgoing arguments should
1862 be written when the stack is pre-pushed (arguments pushed using push
1863 insns always use sp). */
1864
1865 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1866
1867 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1868
1869 /* This points to the Canonical Frame Address of the function. This
1870 should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1871 but is calculated relative to the arg pointer for simplicity; the
1872 frame pointer nor stack pointer are necessarily fixed relative to
1873 the CFA until after reload. */
1874
1875 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1876
1877 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1878
1879 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1880
1881 /* Nonzero if REGNUM is a pointer into the stack frame. */
1882 #define REGNO_PTR_FRAME_P(REGNUM) \
1883 ((REGNUM) == STACK_POINTER_REGNUM \
1884 || (REGNUM) == FRAME_POINTER_REGNUM \
1885 || (REGNUM) == HARD_FRAME_POINTER_REGNUM \
1886 || (REGNUM) == ARG_POINTER_REGNUM \
1887 || ((REGNUM) >= FIRST_VIRTUAL_REGISTER \
1888 && (REGNUM) <= LAST_VIRTUAL_REGISTER))
1889
1890 /* REGNUM never really appearing in the INSN stream. */
1891 #define INVALID_REGNUM (~(unsigned int) 0)
1892
1893 extern rtx find_next_ref PARAMS ((rtx, rtx));
1894
1895 extern rtx output_constant_def PARAMS ((tree, int));
1896
1897 /* Define a default value for STORE_FLAG_VALUE. */
1898
1899 #ifndef STORE_FLAG_VALUE
1900 #define STORE_FLAG_VALUE 1
1901 #endif
1902
1903 /* Nonzero after the second flow pass has completed.
1904 Set to 1 or 0 by toplev.c */
1905 extern int flow2_completed;
1906
1907 /* Nonzero after end of reload pass.
1908 Set to 1 or 0 by reload1.c. */
1909
1910 extern int reload_completed;
1911
1912 /* Set to 1 while reload_as_needed is operating.
1913 Required by some machines to handle any generated moves differently. */
1914
1915 extern int reload_in_progress;
1916
1917 /* If this is nonzero, we do not bother generating VOLATILE
1918 around volatile memory references, and we are willing to
1919 output indirect addresses. If cse is to follow, we reject
1920 indirect addresses so a useful potential cse is generated;
1921 if it is used only once, instruction combination will produce
1922 the same indirect address eventually. */
1923 extern int cse_not_expected;
1924
1925 /* Set to nonzero before life analysis to indicate that it is unsafe to
1926 generate any new pseudo registers. */
1927 extern int no_new_pseudos;
1928
1929 /* Translates rtx code to tree code, for those codes needed by
1930 REAL_ARITHMETIC. The function returns an int because the caller may not
1931 know what `enum tree_code' means. */
1932
1933 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1934
1935 /* In tree.c */
1936 struct obstack;
1937 extern void gcc_obstack_init PARAMS ((struct obstack *));
1938
1939 /* In cse.c */
1940 struct cse_basic_block_data;
1941
1942 /* Return the right cost to give to an operation
1943 to make the cost of the corresponding register-to-register instruction
1944 N times that of a fast register-to-register instruction. */
1945 #define COSTS_N_INSNS(N) ((N) * 4)
1946
1947 /* Maximum cost of a rtl expression. This value has the special meaning
1948 not to use an rtx with this cost under any circumstances. */
1949 #define MAX_COST INT_MAX
1950
1951 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1952 extern int address_cost PARAMS ((rtx, enum machine_mode));
1953 extern int delete_trivially_dead_insns PARAMS ((rtx, int));
1954 #ifdef BUFSIZ
1955 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1956 #endif
1957 extern void cse_end_of_basic_block PARAMS ((rtx,
1958 struct cse_basic_block_data *,
1959 int, int, int));
1960
1961 /* In jump.c */
1962 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1963 extern int condjump_p PARAMS ((rtx));
1964 extern int any_condjump_p PARAMS ((rtx));
1965 extern int any_uncondjump_p PARAMS ((rtx));
1966 extern int safe_to_remove_jump_p PARAMS ((rtx));
1967 extern rtx pc_set PARAMS ((rtx));
1968 extern rtx condjump_label PARAMS ((rtx));
1969 extern int simplejump_p PARAMS ((rtx));
1970 extern int returnjump_p PARAMS ((rtx));
1971 extern int onlyjump_p PARAMS ((rtx));
1972 extern int only_sets_cc0_p PARAMS ((rtx));
1973 extern int sets_cc0_p PARAMS ((rtx));
1974 extern int invert_jump_1 PARAMS ((rtx, rtx));
1975 extern int invert_jump PARAMS ((rtx, rtx, int));
1976 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1977 extern int true_regnum PARAMS ((rtx));
1978 extern unsigned int reg_or_subregno PARAMS ((rtx));
1979 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1980 extern int redirect_jump PARAMS ((rtx, rtx, int));
1981 extern void rebuild_jump_labels PARAMS ((rtx));
1982 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1983 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1984 rtx, rtx, rtx));
1985 extern void delete_for_peephole PARAMS ((rtx, rtx));
1986 extern int condjump_in_parallel_p PARAMS ((rtx));
1987 extern void never_reached_warning PARAMS ((rtx, rtx));
1988 extern void purge_line_number_notes PARAMS ((rtx));
1989 extern void copy_loop_headers PARAMS ((rtx));
1990
1991 /* In emit-rtl.c. */
1992 extern int max_reg_num PARAMS ((void));
1993 extern int max_label_num PARAMS ((void));
1994 extern int get_first_label_num PARAMS ((void));
1995 extern void delete_insns_since PARAMS ((rtx));
1996 extern void mark_reg_pointer PARAMS ((rtx, int));
1997 extern void mark_user_reg PARAMS ((rtx));
1998 extern void reset_used_flags PARAMS ((rtx));
1999 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
2000 extern void reorder_insns_nobb PARAMS ((rtx, rtx, rtx));
2001 extern int get_max_uid PARAMS ((void));
2002 extern int in_sequence_p PARAMS ((void));
2003 extern void force_next_line_note PARAMS ((void));
2004 extern void init_emit PARAMS ((void));
2005 extern void init_emit_once PARAMS ((int));
2006 extern void push_topmost_sequence PARAMS ((void));
2007 extern void pop_topmost_sequence PARAMS ((void));
2008 extern int subreg_realpart_p PARAMS ((rtx));
2009 extern void reverse_comparison PARAMS ((rtx));
2010 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
2011 extern void set_new_first_and_last_label_num PARAMS ((int, int));
2012 extern void set_new_last_label_num PARAMS ((int));
2013 extern void unshare_all_rtl_again PARAMS ((rtx));
2014 extern void set_first_insn PARAMS ((rtx));
2015 extern void set_last_insn PARAMS ((rtx));
2016 extern void link_cc0_insns PARAMS ((rtx));
2017 extern void add_insn PARAMS ((rtx));
2018 extern void add_insn_before PARAMS ((rtx, rtx));
2019 extern void add_insn_after PARAMS ((rtx, rtx));
2020 extern void remove_insn PARAMS ((rtx));
2021 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
2022 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
2023 extern enum rtx_code classify_insn PARAMS ((rtx));
2024 extern rtx emit PARAMS ((rtx));
2025 /* Query and clear/ restore no_line_numbers. This is used by the
2026 switch / case handling in stmt.c to give proper line numbers in
2027 warnings about unreachable code. */
2028 int force_line_numbers PARAMS ((void));
2029 void restore_line_number_status PARAMS ((int old_value));
2030 extern void renumber_insns PARAMS ((FILE *));
2031 extern void remove_unnecessary_notes PARAMS ((void));
2032 extern rtx delete_insn PARAMS ((rtx));
2033 extern void delete_insn_chain PARAMS ((rtx, rtx));
2034 extern rtx delete_insn_and_edges PARAMS ((rtx));
2035 extern void delete_insn_chain_and_edges PARAMS ((rtx, rtx));
2036
2037 /* In combine.c */
2038 extern int combine_instructions PARAMS ((rtx, unsigned int));
2039 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
2040 extern rtx remove_death PARAMS ((unsigned int, rtx));
2041 #ifdef BUFSIZ
2042 extern void dump_combine_stats PARAMS ((FILE *));
2043 extern void dump_combine_total_stats PARAMS ((FILE *));
2044 #endif
2045
2046 /* In sched.c. */
2047 #ifdef BUFSIZ
2048 extern void schedule_insns PARAMS ((FILE *));
2049 extern void schedule_ebbs PARAMS ((FILE *));
2050 #endif
2051 extern void fix_sched_param PARAMS ((const char *, const char *));
2052
2053 /* In print-rtl.c */
2054 extern const char *print_rtx_head;
2055 extern void debug_rtx PARAMS ((rtx));
2056 extern void debug_rtx_list PARAMS ((rtx, int));
2057 extern void debug_rtx_range PARAMS ((rtx, rtx));
2058 extern rtx debug_rtx_find PARAMS ((rtx, int));
2059 #ifdef BUFSIZ
2060 extern void print_mem_expr PARAMS ((FILE *, tree));
2061 extern void print_rtl PARAMS ((FILE *, rtx));
2062 extern void print_simple_rtl PARAMS ((FILE *, rtx));
2063 extern int print_rtl_single PARAMS ((FILE *, rtx));
2064 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
2065 #endif
2066
2067 /* In loop.c */
2068 extern void init_loop PARAMS ((void));
2069 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
2070 #ifdef BUFSIZ
2071 extern void loop_optimize PARAMS ((rtx, FILE *, int));
2072 #endif
2073 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
2074
2075 /* In function.c */
2076 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
2077 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
2078 extern int prologue_epilogue_contains PARAMS ((rtx));
2079 extern int sibcall_epilogue_contains PARAMS ((rtx));
2080 extern void preserve_rtl_expr_result PARAMS ((rtx));
2081 extern void mark_temp_addr_taken PARAMS ((rtx));
2082 extern void update_temp_slot_address PARAMS ((rtx, rtx));
2083 extern void purge_addressof PARAMS ((rtx));
2084 extern void purge_hard_subreg_sets PARAMS ((rtx));
2085
2086 /* In stmt.c */
2087 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
2088 extern void expand_null_return PARAMS ((void));
2089 extern void emit_jump PARAMS ((rtx));
2090 extern int preserve_subexpressions_p PARAMS ((void));
2091
2092 /* In expr.c */
2093 extern void move_by_pieces PARAMS ((rtx, rtx,
2094 unsigned HOST_WIDE_INT,
2095 unsigned int));
2096
2097 /* In flow.c */
2098 extern void recompute_reg_usage PARAMS ((rtx, int));
2099 extern int initialize_uninitialized_subregs PARAMS ((void));
2100 extern void delete_dead_jumptables PARAMS ((void));
2101 #ifdef BUFSIZ
2102 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
2103 extern void dump_flow_info PARAMS ((FILE *));
2104 #endif
2105
2106 /* In expmed.c */
2107 extern void init_expmed PARAMS ((void));
2108 extern void expand_inc PARAMS ((rtx, rtx));
2109 extern void expand_dec PARAMS ((rtx, rtx));
2110 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
2111 unsigned HOST_WIDE_INT, rtx,
2112 int, int));
2113
2114 /* In gcse.c */
2115 #ifdef BUFSIZ
2116 extern int gcse_main PARAMS ((rtx, FILE *));
2117 extern int bypass_jumps PARAMS ((FILE *));
2118 #endif
2119
2120 /* In global.c */
2121 extern void mark_elimination PARAMS ((int, int));
2122 #ifdef BUFSIZ
2123 extern int global_alloc PARAMS ((FILE *));
2124 extern void dump_global_regs PARAMS ((FILE *));
2125 #endif
2126 #ifdef HARD_CONST
2127 /* Yes, this ifdef is silly, but HARD_REG_SET is not always defined. */
2128 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
2129 #endif
2130 extern void build_insn_chain PARAMS ((rtx));
2131
2132 /* In regclass.c */
2133 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
2134 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
2135 extern void globalize_reg PARAMS ((int));
2136 extern void init_regs PARAMS ((void));
2137 extern void init_fake_stack_mems PARAMS ((void));
2138 extern void init_reg_sets PARAMS ((void));
2139 extern void regset_release_memory PARAMS ((void));
2140 extern void regclass_init PARAMS ((void));
2141 extern void regclass PARAMS ((rtx, int, FILE *));
2142 extern void reg_scan PARAMS ((rtx, unsigned int, int));
2143 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
2144 extern void fix_register PARAMS ((const char *, int, int));
2145 #ifdef HARD_CONST
2146 extern void cannot_change_mode_set_regs PARAMS ((HARD_REG_SET *,
2147 enum machine_mode,
2148 unsigned int));
2149 #endif
2150 extern bool invalid_mode_change_p PARAMS ((unsigned int,
2151 enum reg_class,
2152 enum machine_mode));
2153
2154 extern int delete_null_pointer_checks PARAMS ((rtx));
2155
2156 /* In regmove.c */
2157 #ifdef BUFSIZ
2158 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
2159 #endif
2160 extern void combine_stack_adjustments PARAMS ((void));
2161
2162 /* In reorg.c */
2163 #ifdef BUFSIZ
2164 extern void dbr_schedule PARAMS ((rtx, FILE *));
2165 #endif
2166
2167 /* In local-alloc.c */
2168 #ifdef BUFSIZ
2169 extern void dump_local_alloc PARAMS ((FILE *));
2170 #endif
2171 extern int local_alloc PARAMS ((void));
2172 extern int function_invariant_p PARAMS ((rtx));
2173
2174 /* In profile.c */
2175 extern void init_branch_prob PARAMS ((const char *));
2176 extern void branch_prob PARAMS ((void));
2177 extern void end_branch_prob PARAMS ((void));
2178 extern void create_profiler PARAMS ((void));
2179
2180 /* In reg-stack.c */
2181 #ifdef BUFSIZ
2182 extern void reg_to_stack PARAMS ((rtx, FILE *));
2183 #endif
2184
2185 /* In fold-const.c */
2186 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2187 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2188 unsigned HOST_WIDE_INT *,
2189 HOST_WIDE_INT *));
2190 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2191 unsigned HOST_WIDE_INT *,
2192 HOST_WIDE_INT *));
2193 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
2194 HOST_WIDE_INT,
2195 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2196 unsigned HOST_WIDE_INT *,
2197 HOST_WIDE_INT *));
2198 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2199 HOST_WIDE_INT, unsigned int,
2200 unsigned HOST_WIDE_INT *,
2201 HOST_WIDE_INT *, int));
2202 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2203 HOST_WIDE_INT, unsigned int,
2204 unsigned HOST_WIDE_INT *,
2205 HOST_WIDE_INT *, int));
2206 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2207 HOST_WIDE_INT, unsigned int,
2208 unsigned HOST_WIDE_INT *,
2209 HOST_WIDE_INT *));
2210 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2211 HOST_WIDE_INT, unsigned int,
2212 unsigned HOST_WIDE_INT *,
2213 HOST_WIDE_INT *));
2214
2215 /* In calls.c */
2216 enum libcall_type
2217 {
2218 LCT_NORMAL = 0,
2219 LCT_CONST = 1,
2220 LCT_PURE = 2,
2221 LCT_CONST_MAKE_BLOCK = 3,
2222 LCT_PURE_MAKE_BLOCK = 4,
2223 LCT_NORETURN = 5,
2224 LCT_THROW = 6,
2225 LCT_ALWAYS_RETURN = 7,
2226 LCT_RETURNS_TWICE = 8
2227 };
2228
2229 extern void emit_library_call PARAMS ((rtx, enum libcall_type,
2230 enum machine_mode, int,
2231 ...));
2232 extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
2233 enum machine_mode, int,
2234 ...));
2235
2236 /* In unroll.c */
2237 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
2238
2239 /* In varasm.c */
2240 extern int in_data_section PARAMS ((void));
2241 extern void init_varasm_once PARAMS ((void));
2242
2243 /* In rtl.c */
2244 extern void init_rtl PARAMS ((void));
2245 extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
2246 void *));
2247 struct md_constant { char *name, *value; };
2248
2249 #ifdef BUFSIZ
2250 extern int read_skip_spaces PARAMS ((FILE *));
2251 extern rtx read_rtx PARAMS ((FILE *));
2252 #endif
2253
2254 extern const char *read_rtx_filename;
2255 extern int read_rtx_lineno;
2256
2257 /* Redefine abort to report an internal error w/o coredump, and
2258 reporting the location of the error in the source file. This logic
2259 is duplicated in rtl.h and tree.h because every file that needs the
2260 special abort includes one or both. toplev.h gets too few files,
2261 system.h gets too many. */
2262
2263 extern void fancy_abort PARAMS ((const char *, int, const char *))
2264 ATTRIBUTE_NORETURN;
2265 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
2266
2267 /* In alias.c */
2268 extern void clear_reg_alias_info PARAMS ((rtx));
2269 extern rtx canon_rtx PARAMS ((rtx));
2270 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2271 int (*)(rtx, int)));
2272 extern rtx get_addr PARAMS ((rtx));
2273 extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2274 rtx, int (*)(rtx, int)));
2275 extern int read_dependence PARAMS ((rtx, rtx));
2276 extern int anti_dependence PARAMS ((rtx, rtx));
2277 extern int output_dependence PARAMS ((rtx, rtx));
2278 extern void mark_constant_function PARAMS ((void));
2279 extern void init_alias_once PARAMS ((void));
2280 extern void init_alias_analysis PARAMS ((void));
2281 extern void end_alias_analysis PARAMS ((void));
2282 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
2283 extern bool memory_modified_in_insn_p PARAMS ((rtx, rtx));
2284
2285 /* In sibcall.c */
2286 typedef enum {
2287 sibcall_use_normal = 1,
2288 sibcall_use_tail_recursion,
2289 sibcall_use_sibcall
2290 } sibcall_use_t;
2291
2292 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2293 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2294
2295 #ifdef STACK_REGS
2296 extern int stack_regs_mentioned PARAMS ((rtx insn));
2297 #endif
2298
2299 /* In toplev.c */
2300 extern GTY(()) rtx stack_limit_rtx;
2301
2302 /* In regrename.c */
2303 extern void regrename_optimize PARAMS ((void));
2304 extern void copyprop_hardreg_forward PARAMS ((void));
2305
2306 /* In ifcvt.c */
2307 extern void if_convert PARAMS ((int));
2308
2309 /* In predict.c */
2310 extern void invert_br_probabilities PARAMS ((rtx));
2311 extern bool expensive_function_p PARAMS ((int));
2312 /* In tracer.c */
2313 extern void tracer PARAMS ((void));
2314
2315 /* In calls.c */
2316
2317 /* Nonzero if this is a call to a `const' function. */
2318 #define ECF_CONST 1
2319 /* Nonzero if this is a call to a `volatile' function. */
2320 #define ECF_NORETURN 2
2321 /* Nonzero if this is a call to malloc or a related function. */
2322 #define ECF_MALLOC 4
2323 /* Nonzero if it is plausible that this is a call to alloca. */
2324 #define ECF_MAY_BE_ALLOCA 8
2325 /* Nonzero if this is a call to a function that won't throw an exception. */
2326 #define ECF_NOTHROW 16
2327 /* Nonzero if this is a call to setjmp or a related function. */
2328 #define ECF_RETURNS_TWICE 32
2329 /* Nonzero if this is a call to `longjmp'. */
2330 #define ECF_LONGJMP 64
2331 /* Nonzero if this is a syscall that makes a new process in the image of
2332 the current one. */
2333 #define ECF_FORK_OR_EXEC 128
2334 #define ECF_SIBCALL 256
2335 /* Nonzero if this is a call to "pure" function (like const function,
2336 but may read memory. */
2337 #define ECF_PURE 512
2338 /* Nonzero if this is a call to a function that returns with the stack
2339 pointer depressed. */
2340 #define ECF_SP_DEPRESSED 1024
2341 /* Nonzero if this call is known to always return. */
2342 #define ECF_ALWAYS_RETURN 2048
2343 /* Create libcall block around the call. */
2344 #define ECF_LIBCALL_BLOCK 4096
2345
2346 extern int flags_from_decl_or_type PARAMS ((tree));
2347
2348 #endif /* ! GCC_RTL_H */
GNU Compiler Collection
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