PR libstdc++/3584
[official-gcc.git] / gcc / rtl.h
blobd4147c221c0a598f1e6a4e444a4e99ba49a27eb9
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 Free Software Foundation, Inc.
5 This file is part of GCC.
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.
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.
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. */
22 #ifndef GCC_RTL_H
23 #define GCC_RTL_H
25 struct function;
27 #include "machmode.h"
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. */
34 /* Value used by some passes to "recognize" noop moves as valid
35 instructions. */
36 #define NOOP_MOVE_INSN_CODE INT_MAX
38 /* Register Transfer Language EXPRESSIONS CODES */
40 #define RTX_CODE enum rtx_code
41 enum rtx_code {
43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
44 #include "rtl.def" /* rtl expressions are documented here */
45 #undef DEF_RTL_EXPR
47 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
48 NUM_RTX_CODE.
49 Assumes default enum value assignment. */
51 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
54 extern const unsigned char rtx_length[NUM_RTX_CODE];
55 #define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
57 extern const char * const rtx_name[NUM_RTX_CODE];
58 #define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
60 extern const char * const rtx_format[NUM_RTX_CODE];
61 #define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
63 extern const char rtx_class[NUM_RTX_CODE];
64 #define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
66 extern const unsigned char rtx_next[NUM_RTX_CODE];
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
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;
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(())
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;
106 /* Common union for an element of an rtx. */
108 union rtunion_def
110 HOST_WIDE_INT rtwint;
111 int rtint;
112 unsigned int rtuint;
113 const char *rtstr;
114 rtx rtx;
115 rtvec rtvec;
116 enum machine_mode rttype;
117 addr_diff_vec_flags rt_addr_diff_vec_flags;
118 struct cselib_val_struct *rt_cselib;
119 struct bitmap_head_def *rtbit;
120 tree rttree;
121 struct basic_block_def *bb;
122 mem_attrs *rtmem;
124 typedef union rtunion_def rtunion;
126 /* RTL expression ("rtx"). */
128 struct rtx_def GTY((chain_next ("RTX_NEXT (&%h)"),
129 chain_prev ("RTX_PREV (&%h)")))
131 /* The kind of expression this is. */
132 ENUM_BITFIELD(rtx_code) code: 16;
134 /* The kind of value the expression has. */
135 ENUM_BITFIELD(machine_mode) mode : 8;
137 /* 1 in a MEM if we should keep the alias set for this mem unchanged
138 when we access a component.
139 1 in a CALL_INSN if it is a sibling call.
140 1 in a SET that is for a return.
141 In a CODE_LABEL, part of the two-bit alternate entry field. */
142 unsigned int jump : 1;
143 /* In a CODE_LABEL, part of the two-bit alternate entry field. */
144 unsigned int call : 1;
145 /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
146 1 in a SUBREG if it references an unsigned object whose mode has been
147 from a promoted to a wider mode.
148 1 in a SYMBOL_REF if it addresses something in the per-function
149 constants pool.
150 1 in a CALL_INSN, NOTE, or EXPR_LIST for a const or pure call.
151 1 in a JUMP_INSN, CALL_INSN, or INSN of an annulling branch. */
152 unsigned int unchanging : 1;
153 /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
154 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
155 if it has been deleted.
156 1 in a REG expression if corresponds to a variable declared by the user,
157 0 for an internally generated temporary.
158 1 in a SUBREG with a negative value.
159 1 in a LABEL_REF or in a REG_LABEL note for a non-local label.
160 In a SYMBOL_REF, this flag is used for machine-specific purposes. */
161 unsigned int volatil : 1;
162 /* 1 in a MEM referring to a field of an aggregate.
163 0 if the MEM was a variable or the result of a * operator in C;
164 1 if it was the result of a . or -> operator (on a struct) in C.
165 1 in a REG if the register is used only in exit code a loop.
166 1 in a SUBREG expression if was generated from a variable with a
167 promoted mode.
168 1 in a CODE_LABEL if the label is used for nonlocal gotos
169 and must not be deleted even if its count is zero.
170 1 in a LABEL_REF if this is a reference to a label outside the
171 current loop.
172 1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
173 together with the preceding insn. Valid only within sched.
174 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
175 from the target of a branch. Valid from reorg until end of compilation;
176 cleared before used.
177 1 in an INSN or related rtx if this insn is dead code. Valid only during
178 dead-code elimination phase; cleared before use. */
179 unsigned int in_struct : 1;
180 /* At the end of RTL generation, 1 if this rtx is used. This is used for
181 copying shared structure. See `unshare_all_rtl'.
182 In a REG, this is not needed for that purpose, and used instead
183 in `leaf_renumber_regs_insn'.
184 1 in a SYMBOL_REF, means that emit_library_call
185 has used it as the function. */
186 unsigned int used : 1;
187 /* Nonzero if this rtx came from procedure integration.
188 1 in a REG means this reg refers to the return value
189 of the current function.
190 1 in a SYMBOL_REF if the symbol is weak. */
191 unsigned integrated : 1;
192 /* 1 in an INSN or a SET if this rtx is related to the call frame,
193 either changing how we compute the frame address or saving and
194 restoring registers in the prologue and epilogue.
195 1 in a MEM if the MEM refers to a scalar, rather than a member of
196 an aggregate.
197 1 in a REG if the register is a pointer.
198 1 in a SYMBOL_REF if it addresses something in the per-function
199 constant string pool. */
200 unsigned frame_related : 1;
202 /* The first element of the operands of this rtx.
203 The number of operands and their types are controlled
204 by the `code' field, according to rtl.def. */
205 rtunion GTY ((special ("rtx_def"),
206 desc ("GET_CODE (&%0)"))) fld[1];
209 #define NULL_RTX (rtx) 0
211 /* The "next" and "previous" RTX, relative to this one. */
213 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL \
214 : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
216 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
218 #define RTX_PREV(X) ((GET_CODE (X) == INSN \
219 || GET_CODE (X) == CALL_INSN \
220 || GET_CODE (X) == JUMP_INSN \
221 || GET_CODE (X) == NOTE \
222 || GET_CODE (X) == BARRIER \
223 || GET_CODE (X) == CODE_LABEL) \
224 && PREV_INSN (X) != NULL \
225 && NEXT_INSN (PREV_INSN (X)) == X \
226 ? PREV_INSN (X) : NULL)
228 /* Define macros to access the `code' field of the rtx. */
230 #define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
231 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
233 #define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
234 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
236 /* RTL vector. These appear inside RTX's when there is a need
237 for a variable number of things. The principle use is inside
238 PARALLEL expressions. */
240 struct rtvec_def GTY(()) {
241 int num_elem; /* number of elements */
242 rtx GTY ((length ("%h.num_elem"))) elem[1];
245 #define NULL_RTVEC (rtvec) 0
247 #define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
248 #define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
250 /* Predicate yielding nonzero iff X is an rtl for a register. */
251 #define REG_P(X) (GET_CODE (X) == REG)
253 /* Predicate yielding nonzero iff X is a label insn. */
254 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
256 /* Predicate yielding nonzero iff X is a jump insn. */
257 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
259 /* Predicate yielding nonzero iff X is a note insn. */
260 #define NOTE_P(X) (GET_CODE (X) == NOTE)
262 /* Predicate yielding nonzero iff X is a barrier insn. */
263 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
265 /* Predicate yielding nonzero iff X is cc0. */
266 #ifdef HAVE_cc0
267 #define CC0_P(X) ((X) == cc0_rtx)
268 #else
269 #define CC0_P(X) 0
270 #endif
272 /* Predicate yielding nonzero iff X is a data for a jump table. */
273 #define JUMP_TABLE_DATA_P(INSN) \
274 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
275 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
277 /* 1 if X is a constant value that is an integer. */
279 #define CONSTANT_P(X) \
280 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
281 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
282 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
283 || GET_CODE (X) == CONST_VECTOR \
284 || GET_CODE (X) == CONSTANT_P_RTX)
286 /* General accessor macros for accessing the fields of an rtx. */
288 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
289 /* The bit with a star outside the statement expr and an & inside is
290 so that N can be evaluated only once. */
291 #define RTL_CHECK1(RTX, N, C1) __extension__ \
292 (*({ rtx const _rtx = (RTX); const int _n = (N); \
293 const enum rtx_code _code = GET_CODE (_rtx); \
294 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
295 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, \
296 __FUNCTION__); \
297 if (GET_RTX_FORMAT(_code)[_n] != C1) \
298 rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__, \
299 __FUNCTION__); \
300 &_rtx->fld[_n]; }))
302 #define RTL_CHECK2(RTX, N, C1, C2) __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 && GET_RTX_FORMAT(_code)[_n] != C2) \
310 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
311 __FUNCTION__); \
312 &_rtx->fld[_n]; }))
314 #define RTL_CHECKC1(RTX, N, C) __extension__ \
315 (*({ rtx const _rtx = (RTX); const int _n = (N); \
316 if (GET_CODE (_rtx) != (C)) \
317 rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__, \
318 __FUNCTION__); \
319 &_rtx->fld[_n]; }))
321 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
322 (*({ rtx const _rtx = (RTX); const int _n = (N); \
323 const enum rtx_code _code = GET_CODE (_rtx); \
324 if (_code != (C1) && _code != (C2)) \
325 rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__, \
326 __FUNCTION__); \
327 &_rtx->fld[_n]; }))
329 #define RTVEC_ELT(RTVEC, I) __extension__ \
330 (*({ rtvec const _rtvec = (RTVEC); const int _i = (I); \
331 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
332 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
333 __FUNCTION__); \
334 &_rtvec->elem[_i]; }))
336 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
337 const char *, int, const char *))
338 ATTRIBUTE_NORETURN;
339 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
340 const char *, int, const char *))
341 ATTRIBUTE_NORETURN;
342 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
343 const char *, int, const char *))
344 ATTRIBUTE_NORETURN;
345 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
346 const char *, int, const char *))
347 ATTRIBUTE_NORETURN;
348 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
349 const char *, int, const char *))
350 ATTRIBUTE_NORETURN;
351 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
352 const char *, int, const char *))
353 ATTRIBUTE_NORETURN;
355 #else /* not ENABLE_RTL_CHECKING */
357 #define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
358 #define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
359 #define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
360 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
361 #define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
363 #endif
365 /* General accessor macros for accessing the flags of an rtx. */
367 /* Access an individual rtx flag, with no checking of any kind. */
368 #define RTX_FLAG(RTX, FLAG) ((RTX)->FLAG)
370 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
371 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__ \
372 ({ rtx const _rtx = (RTX); \
373 if (GET_CODE(_rtx) != C1) \
374 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
375 __FUNCTION__); \
376 _rtx; })
378 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__ \
379 ({ rtx const _rtx = (RTX); \
380 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2) \
381 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
382 __FUNCTION__); \
383 _rtx; })
385 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__ \
386 ({ rtx const _rtx = (RTX); \
387 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
388 && GET_CODE(_rtx) != C3) \
389 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
390 __FUNCTION__); \
391 _rtx; })
393 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__ \
394 ({ rtx const _rtx = (RTX); \
395 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
396 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4) \
397 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
398 __FUNCTION__); \
399 _rtx; })
401 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__ \
402 ({ rtx const _rtx = (RTX); \
403 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
404 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
405 && GET_CODE(_rtx) != C5) \
406 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
407 __FUNCTION__); \
408 _rtx; })
410 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) \
411 __extension__ \
412 ({ rtx const _rtx = (RTX); \
413 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
414 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
415 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6) \
416 rtl_check_failed_flag (NAME,_rtx, __FILE__, __LINE__, \
417 __FUNCTION__); \
418 _rtx; })
420 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) \
421 __extension__ \
422 ({ rtx const _rtx = (RTX); \
423 if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2 \
424 && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4 \
425 && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6 \
426 && GET_CODE(_rtx) != C7) \
427 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
428 __FUNCTION__); \
429 _rtx; })
431 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) \
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 && GET_CODE(_rtx) != C8) \
438 rtl_check_failed_flag (NAME, _rtx, __FILE__, __LINE__, \
439 __FUNCTION__); \
440 _rtx; })
442 extern void rtl_check_failed_flag PARAMS ((const char *, rtx, const char *,
443 int, const char *))
444 ATTRIBUTE_NORETURN
447 #else /* not ENABLE_RTL_FLAG_CHECKING */
449 #define RTL_FLAG_CHECK1(NAME, RTX, C1) (RTX)
450 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) (RTX)
451 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) (RTX)
452 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) (RTX)
453 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) (RTX)
454 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6) (RTX)
455 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7) (RTX)
456 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8) (RTX)
457 #endif
459 #define CLEAR_RTX_FLAGS(RTX) \
460 do { \
461 rtx const _rtx = (RTX); \
462 _rtx->call = 0; \
463 _rtx->frame_related = 0; \
464 _rtx->in_struct = 0; \
465 _rtx->integrated = 0; \
466 _rtx->jump = 0; \
467 _rtx->unchanging = 0; \
468 _rtx->used = 0; \
469 _rtx->volatil = 0; \
470 } while (0)
472 #define XWINT(RTX, N) (RTL_CHECK1 (RTX, N, 'w').rtwint)
473 #define XINT(RTX, N) (RTL_CHECK2 (RTX, N, 'i', 'n').rtint)
474 #define XSTR(RTX, N) (RTL_CHECK2 (RTX, N, 's', 'S').rtstr)
475 #define XEXP(RTX, N) (RTL_CHECK2 (RTX, N, 'e', 'u').rtx)
476 #define XVEC(RTX, N) (RTL_CHECK2 (RTX, N, 'E', 'V').rtvec)
477 #define XMODE(RTX, N) (RTL_CHECK1 (RTX, N, 'M').rttype)
478 #define XBITMAP(RTX, N) (RTL_CHECK1 (RTX, N, 'b').rtbit)
479 #define XTREE(RTX, N) (RTL_CHECK1 (RTX, N, 't').rttree)
480 #define XBBDEF(RTX, N) (RTL_CHECK1 (RTX, N, 'B').bb)
481 #define XTMPL(RTX, N) (RTL_CHECK1 (RTX, N, 'T').rtstr)
483 #define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
484 #define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
486 /* These are like XWINT, etc. except that they expect a '0' field instead
487 of the normal type code. */
489 #define X0WINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtwint)
490 #define X0INT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtint)
491 #define X0UINT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtuint)
492 #define X0STR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtstr)
493 #define X0EXP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtx)
494 #define X0VEC(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtvec)
495 #define X0MODE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttype)
496 #define X0BITMAP(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtbit)
497 #define X0TREE(RTX, N) (RTL_CHECK1 (RTX, N, '0').rttree)
498 #define X0BBDEF(RTX, N) (RTL_CHECK1 (RTX, N, '0').bb)
499 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
500 #define X0CSELIB(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_cselib)
501 #define X0MEMATTR(RTX, N) (RTL_CHECK1 (RTX, N, '0').rtmem)
503 #define XCWINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtwint)
504 #define XCINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtint)
505 #define XCUINT(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtuint)
506 #define XCSTR(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtstr)
507 #define XCEXP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtx)
508 #define XCVEC(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtvec)
509 #define XCMODE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttype)
510 #define XCBITMAP(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rtbit)
511 #define XCTREE(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rttree)
512 #define XCBBDEF(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).bb)
513 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_addr_diff_vec_flags)
514 #define XCCSELIB(RTX, N, C) (RTL_CHECKC1 (RTX, N, C).rt_cselib)
516 #define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
517 #define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
519 #define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2 (RTX, N, C1, C2).rtx)
521 /* ACCESS MACROS for particular fields of insns. */
523 /* Determines whether X is an insn. */
524 #define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
526 /* Holds a unique number for each insn.
527 These are not necessarily sequentially increasing. */
528 #define INSN_UID(INSN) XINT (INSN, 0)
530 /* Chain insns together in sequence. */
531 #define PREV_INSN(INSN) XEXP (INSN, 1)
532 #define NEXT_INSN(INSN) XEXP (INSN, 2)
534 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
535 #define INSN_SCOPE(INSN) XTREE (INSN, 4)
536 /* The body of an insn. */
537 #define PATTERN(INSN) XEXP (INSN, 5)
539 /* Code number of instruction, from when it was recognized.
540 -1 means this instruction has not been recognized yet. */
541 #define INSN_CODE(INSN) XINT (INSN, 6)
543 /* Set up in flow.c; empty before then.
544 Holds a chain of INSN_LIST rtx's whose first operands point at
545 previous insns with direct data-flow connections to this one.
546 That means that those insns set variables whose next use is in this insn.
547 They are always in the same basic block as this insn. */
548 #define LOG_LINKS(INSN) XEXP(INSN, 7)
550 #define RTX_INTEGRATED_P(RTX) \
551 (RTL_FLAG_CHECK8("RTX_INTEGRATED_P", (RTX), INSN, CALL_INSN, \
552 JUMP_INSN, INSN_LIST, BARRIER, CODE_LABEL, CONST, \
553 NOTE)->integrated)
554 #define RTX_UNCHANGING_P(RTX) \
555 (RTL_FLAG_CHECK3("RTX_UNCHANGING_P", (RTX), REG, MEM, CONCAT)->unchanging)
556 #define RTX_FRAME_RELATED_P(RTX) \
557 (RTL_FLAG_CHECK5("RTX_FRAME_RELATED_P", (RTX), INSN, CALL_INSN, \
558 JUMP_INSN, BARRIER, SET)->frame_related)
560 /* 1 if RTX is an insn that has been deleted. */
561 #define INSN_DELETED_P(RTX) \
562 (RTL_FLAG_CHECK6("INSN_DELETED_P", (RTX), INSN, CALL_INSN, JUMP_INSN, \
563 CODE_LABEL, BARRIER, NOTE)->volatil)
565 /* 1 if RTX is a call to a const or pure function. */
566 #define CONST_OR_PURE_CALL_P(RTX) \
567 (RTL_FLAG_CHECK3("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN, NOTE, \
568 EXPR_LIST)->unchanging)
570 /* 1 if RTX is a call_insn for a sibling call. */
571 #define SIBLING_CALL_P(RTX) \
572 (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
574 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch. */
575 #define INSN_ANNULLED_BRANCH_P(RTX) \
576 (RTL_FLAG_CHECK3("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN, CALL_INSN, INSN)->unchanging)
578 /* 1 if RTX is an insn that is dead code. Valid only for dead-code
579 elimination phase. */
580 #define INSN_DEAD_CODE_P(RTX) \
581 (RTL_FLAG_CHECK1("INSN_DEAD_CODE_P", (RTX), INSN)->in_struct)
583 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
584 If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
585 executed if the branch is taken. For annulled branches with this bit
586 clear, the insn should be executed only if the branch is not taken. */
587 #define INSN_FROM_TARGET_P(RTX) \
588 (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
590 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
592 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
594 /* Holds a list of notes on what this insn does to various REGs.
595 It is a chain of EXPR_LIST rtx's, where the second operand is the
596 chain pointer and the first operand is the REG being described.
597 The mode field of the EXPR_LIST contains not a real machine mode
598 but a value from enum reg_note. */
600 #define REG_NOTES(INSN) XEXP(INSN, 8)
602 /* Don't forget to change reg_note_name in rtl.c. */
603 enum reg_note
605 /* The value in REG dies in this insn (i.e., it is not needed past
606 this insn). If REG is set in this insn, the REG_DEAD note may,
607 but need not, be omitted. */
608 REG_DEAD = 1,
610 /* The REG is autoincremented or autodecremented. */
611 REG_INC,
613 /* Describes the insn as a whole; it says that the insn sets a register
614 to a constant value or to be equivalent to a memory address. If the
615 register is spilled to the stack then the constant value should be
616 substituted for it. The contents of the REG_EQUIV is the constant
617 value or memory address, which may be different from the source of
618 the SET although it has the same value. A REG_EQUIV note may also
619 appear on an insn which copies a register parameter to a pseudo-register,
620 if there is a memory address which could be used to hold that
621 pseudo-register throughout the function. */
622 REG_EQUIV,
624 /* Like REG_EQUIV except that the destination is only momentarily equal
625 to the specified rtx. Therefore, it cannot be used for substitution;
626 but it can be used for cse. */
627 REG_EQUAL,
629 /* The register set in this insn held 0 before the insn. The contents of
630 the note is the insn that stored the 0. If that insn is deleted or
631 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
632 is actually an INSN_LIST, not an EXPR_LIST. */
633 REG_WAS_0,
635 /* This insn copies the return-value of a library call out of the hard reg
636 for return values. This note is actually an INSN_LIST and it points to
637 the first insn involved in setting up arguments for the call. flow.c
638 uses this to delete the entire library call when its result is dead. */
639 REG_RETVAL,
641 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
642 and points at the one that has the REG_RETVAL. This note is also an
643 INSN_LIST. */
644 REG_LIBCALL,
646 /* The register is always nonnegative during the containing loop. This is
647 used in branches so that decrement and branch instructions terminating
648 on zero can be matched. There must be an insn pattern in the md file
649 named `decrement_and_branch_until_zero' or else this will never be added
650 to any instructions. */
651 REG_NONNEG,
653 /* There is no conflict *after this insn* between the register in the note
654 and the destination of this insn. */
655 REG_NO_CONFLICT,
657 /* Identifies a register set in this insn and never used. */
658 REG_UNUSED,
660 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
661 respectively. Normally, these are required to be consecutive insns, but
662 we permit putting a cc0-setting insn in the delay slot of a branch as
663 long as only one copy of the insn exists. In that case, these notes
664 point from one to the other to allow code generation to determine what
665 any require information and to properly update CC_STATUS. These notes
666 are INSN_LISTs. */
667 REG_CC_SETTER, REG_CC_USER,
669 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
670 CODE_LABEL contained in the REG_LABEL note is used by the insn.
671 This note is an INSN_LIST. */
672 REG_LABEL,
674 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
675 write-after-read and write-after-write dependencies respectively.
676 Data dependencies, which are the only type of LOG_LINK created by
677 flow, are represented by a 0 reg note kind. */
678 REG_DEP_ANTI, REG_DEP_OUTPUT,
680 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.
681 It has an integer value. For jumps, it is the probability that this is a
682 taken branch. For calls, it is the probability that this call won't
683 return. */
684 REG_BR_PROB,
686 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
687 the first insn after each CALL_INSN. It indicates how many times this
688 block was executed. */
689 REG_EXEC_COUNT,
691 /* Attached to a call insn; indicates that the call is malloc-like and
692 that the pointer returned cannot alias anything else. */
693 REG_NOALIAS,
695 /* Used to optimize rtl generated by dynamic stack allocations for targets
696 where SETJMP_VIA_SAVE_AREA is true. */
697 REG_SAVE_AREA,
699 /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
700 CONCAT of two integer value. First specifies the branch predictor
701 that added the note, second specifies the predicted hitrate of branch
702 in the same format as REG_BR_PROB note uses. */
703 REG_BR_PRED,
705 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
706 for DWARF to interpret what they imply. The attached rtx is used
707 instead of intuition. */
708 REG_FRAME_RELATED_EXPR,
710 /* Indicates that REG holds the exception context for the function.
711 This context is shared by inline functions, so the code to acquire
712 the real exception context is delayed until after inlining. */
713 REG_EH_CONTEXT,
715 /* Indicates what exception region an INSN belongs in. This is used to
716 indicate what region to which a call may throw. REGION 0 indicates
717 that a call cannot throw at all. REGION -1 indicates that it cannot
718 throw, nor will it execute a non-local goto. */
719 REG_EH_REGION,
721 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
722 REG_SAVE_NOTE,
724 /* Indicates that this insn (which is part of the prologue) computes
725 a value which might not be used later, and if so it's OK to delete
726 the insn. Normally, deleting any insn in the prologue is an error.
727 At present the parameter is unused and set to (const_int 0). */
728 REG_MAYBE_DEAD,
730 /* Indicates that a call does not return. */
731 REG_NORETURN,
733 /* Indicates that an indirect jump is a non-local goto instead of a
734 computed goto. */
735 REG_NON_LOCAL_GOTO,
737 /* This kind of note is generated at each to `setjmp',
738 and similar functions that can return twice. */
739 REG_SETJMP,
741 /* Indicate calls that always returns. */
742 REG_ALWAYS_RETURN,
744 /* Indicate that the memory load references a vtable. The expression
745 is of the form (plus (symbol_ref vtable_sym) (const_int offset)). */
746 REG_VTABLE_REF
749 /* The base value for branch probability notes. */
750 #define REG_BR_PROB_BASE 10000
752 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
753 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
754 #define PUT_REG_NOTE_KIND(LINK, KIND) \
755 PUT_MODE (LINK, (enum machine_mode) (KIND))
757 /* Names for REG_NOTE's in EXPR_LIST insn's. */
759 extern const char * const reg_note_name[];
760 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
762 /* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
763 USE and CLOBBER expressions.
764 USE expressions list the registers filled with arguments that
765 are passed to the function.
766 CLOBBER expressions document the registers explicitly clobbered
767 by this CALL_INSN.
768 Pseudo registers can not be mentioned in this list. */
769 #define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 9)
771 /* The label-number of a code-label. The assembler label
772 is made from `L' and the label-number printed in decimal.
773 Label numbers are unique in a compilation. */
774 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
776 #define LINE_NUMBER NOTE
778 /* In a NOTE that is a line number, this is a string for the file name that the
779 line is in. We use the same field to record block numbers temporarily in
780 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
781 between ints and pointers if we use a different macro for the block number.)
784 #define NOTE_SOURCE_FILE(INSN) XCSTR (INSN, 4, NOTE)
785 #define NOTE_BLOCK(INSN) XCTREE (INSN, 4, NOTE)
786 #define NOTE_EH_HANDLER(INSN) XCINT (INSN, 4, NOTE)
787 #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
788 #define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE)
789 #define NOTE_PREDICTION(INSN) XCINT (INSN, 4, NOTE)
791 /* In a NOTE that is a line number, this is the line number.
792 Other kinds of NOTEs are identified by negative numbers here. */
793 #define NOTE_LINE_NUMBER(INSN) XCINT (INSN, 5, NOTE)
795 /* Nonzero if INSN is a note marking the beginning of a basic block. */
796 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
797 (GET_CODE (INSN) == NOTE \
798 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
800 /* Algorithm and flags for prediction. */
801 #define NOTE_PREDICTION_ALG(INSN) (XCINT(INSN, 4, NOTE)>>8)
802 #define NOTE_PREDICTION_FLAGS(INSN) (XCINT(INSN, 4, NOTE)&0xff)
803 #define NOTE_PREDICT(ALG,FLAGS) ((ALG<<8)+(FLAGS))
805 /* Codes that appear in the NOTE_LINE_NUMBER field
806 for kinds of notes that are not line numbers.
808 Notice that we do not try to use zero here for any of
809 the special note codes because sometimes the source line
810 actually can be zero! This happens (for example) when we
811 are generating code for the per-translation-unit constructor
812 and destructor routines for some C++ translation unit.
814 If you should change any of the following values, or if you
815 should add a new value here, don't forget to change the
816 note_insn_name array in rtl.c. */
818 enum insn_note
820 /* Keep all of these numbers negative. Adjust as needed. */
821 NOTE_INSN_BIAS = -100,
823 /* This note is used to get rid of an insn
824 when it isn't safe to patch the insn out of the chain. */
825 NOTE_INSN_DELETED,
827 /* These are used to mark the beginning and end of a lexical block.
828 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
829 NOTE_INSN_BLOCK_BEG,
830 NOTE_INSN_BLOCK_END,
832 /* These mark the extremes of a loop. */
833 NOTE_INSN_LOOP_BEG,
834 NOTE_INSN_LOOP_END,
836 /* Generated at the place in a loop that `continue' jumps to. */
837 NOTE_INSN_LOOP_CONT,
838 /* Generated at the start of a duplicated exit test. */
839 NOTE_INSN_LOOP_VTOP,
841 /* Generated at the end of a conditional at the top of the loop.
842 This is used to perform a lame form of loop rotation in lieu
843 of actually understanding the loop structure. The note is
844 discarded after rotation is complete. */
845 NOTE_INSN_LOOP_END_TOP_COND,
847 /* This kind of note is generated at the end of the function body,
848 just before the return insn or return label. In an optimizing
849 compilation it is deleted by the first jump optimization, after
850 enabling that optimizer to determine whether control can fall
851 off the end of the function body without a return statement. */
852 NOTE_INSN_FUNCTION_END,
854 /* This marks the point immediately after the last prologue insn. */
855 NOTE_INSN_PROLOGUE_END,
857 /* This marks the point immediately prior to the first epilogue insn. */
858 NOTE_INSN_EPILOGUE_BEG,
860 /* Generated in place of user-declared labels when they are deleted. */
861 NOTE_INSN_DELETED_LABEL,
863 /* This note indicates the start of the real body of the function,
864 i.e. the point just after all of the parms have been moved into
865 their homes, etc. */
866 NOTE_INSN_FUNCTION_BEG,
868 /* These note where exception handling regions begin and end.
869 Uses NOTE_EH_HANDLER to identify the region in question. */
870 NOTE_INSN_EH_REGION_BEG,
871 NOTE_INSN_EH_REGION_END,
873 /* Generated whenever a duplicate line number note is output. For example,
874 one is output after the end of an inline function, in order to prevent
875 the line containing the inline call from being counted twice in gcov. */
876 NOTE_INSN_REPEATED_LINE_NUMBER,
878 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
879 NOTE_INSN_BASIC_BLOCK,
881 /* Record the expected value of a register at a location. Uses
882 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
883 NOTE_INSN_EXPECTED_VALUE,
885 /* Record a prediction. Uses NOTE_PREDICTION. */
886 NOTE_INSN_PREDICTION,
888 NOTE_INSN_MAX
891 /* Names for NOTE insn's other than line numbers. */
893 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
894 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
895 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
897 /* The name of a label, in case it corresponds to an explicit label
898 in the input source code. */
899 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
901 /* In jump.c, each label contains a count of the number
902 of LABEL_REFs that point at it, so unused labels can be deleted. */
903 #define LABEL_NUSES(RTX) XCINT (RTX, 4, CODE_LABEL)
905 /* Labels carry a two-bit field composed of the ->jump and ->call
906 bits. This field indicates whether the label is an alternate
907 entry point, and if so, what kind. */
908 enum label_kind
910 LABEL_NORMAL = 0, /* ordinary label */
911 LABEL_STATIC_ENTRY, /* alternate entry point, not exported */
912 LABEL_GLOBAL_ENTRY, /* alternate entry point, exported */
913 LABEL_WEAK_ENTRY /* alternate entry point, exported as weak symbol */
916 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
918 /* Retrieve the kind of LABEL. */
919 #define LABEL_KIND(LABEL) __extension__ \
920 ({ rtx const _label = (LABEL); \
921 if (GET_CODE (_label) != CODE_LABEL) \
922 rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__, \
923 __FUNCTION__); \
924 (enum label_kind) ((_label->jump << 1) | _label->call); })
926 /* Set the kind of LABEL. */
927 #define SET_LABEL_KIND(LABEL, KIND) do { \
928 rtx _label = (LABEL); \
929 unsigned int _kind = (KIND); \
930 if (GET_CODE (_label) != CODE_LABEL) \
931 rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
932 __FUNCTION__); \
933 _label->jump = ((_kind >> 1) & 1); \
934 _label->call = (_kind & 1); \
935 } while (0)
937 #else
939 /* Retrieve the kind of LABEL. */
940 #define LABEL_KIND(LABEL) \
941 ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
943 /* Set the kind of LABEL. */
944 #define SET_LABEL_KIND(LABEL, KIND) do { \
945 rtx _label = (LABEL); \
946 unsigned int _kind = (KIND); \
947 _label->jump = ((_kind >> 1) & 1); \
948 _label->call = (_kind & 1); \
949 } while (0)
951 #endif /* rtl flag checking */
953 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
955 /* The original regno this ADDRESSOF was built for. */
956 #define ADDRESSOF_REGNO(RTX) XCUINT (RTX, 1, ADDRESSOF)
958 /* The variable in the register we took the address of. */
959 #define ADDRESSOF_DECL(RTX) XCTREE (RTX, 2, ADDRESSOF)
961 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
962 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
963 be decremented and possibly the label can be deleted. */
964 #define JUMP_LABEL(INSN) XCEXP (INSN, 9, JUMP_INSN)
966 /* Once basic blocks are found in flow.c,
967 each CODE_LABEL starts a chain that goes through
968 all the LABEL_REFs that jump to that label.
969 The chain eventually winds up at the CODE_LABEL: it is circular. */
970 #define LABEL_REFS(LABEL) XCEXP (LABEL, 5, CODE_LABEL)
972 /* This is the field in the LABEL_REF through which the circular chain
973 of references to a particular label is linked.
974 This chain is set up in flow.c. */
976 #define LABEL_NEXTREF(REF) XCEXP (REF, 1, LABEL_REF)
978 /* Once basic blocks are found in flow.c,
979 Each LABEL_REF points to its containing instruction with this field. */
981 #define CONTAINING_INSN(RTX) XCEXP (RTX, 2, LABEL_REF)
983 /* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
984 the number the register originally had; for a pseudo register turned into
985 a hard reg this will hold the old pseudo register number. */
987 #define REGNO(RTX) XCUINT (RTX, 0, REG)
988 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
990 /* 1 if RTX is a reg that is the current function's return value. */
991 #define REG_FUNCTION_VALUE_P(RTX) \
992 (RTL_FLAG_CHECK1("REG_FUNCTION_VALUE_P", (RTX), REG)->integrated)
994 /* 1 if RTX is a reg that corresponds to a variable declared by the user. */
995 #define REG_USERVAR_P(RTX) \
996 (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
998 /* 1 if RTX is a reg that holds a pointer value. */
999 #define REG_POINTER(RTX) \
1000 (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
1002 /* 1 if the given register REG corresponds to a hard register. */
1003 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1005 /* 1 if the given register number REG_NO corresponds to a hard register. */
1006 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1008 /* For a CONST_INT rtx, INTVAL extracts the integer. */
1010 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
1012 /* For a CONST_DOUBLE:
1013 For a DImode, there are two integers CONST_DOUBLE_LOW is the
1014 low-order word and ..._HIGH the high-order.
1015 For a float, there is a REAL_VALUE_TYPE structure, and
1016 CONST_DOUBLE_REAL_VALUE(r) is a pointer to it. */
1017 #define CONST_DOUBLE_LOW(r) XCWINT (r, 0, CONST_DOUBLE)
1018 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 1, CONST_DOUBLE)
1019 #define CONST_DOUBLE_REAL_VALUE(r) ((struct real_value *)&CONST_DOUBLE_LOW(r))
1021 /* For a CONST_VECTOR, return element #n. */
1022 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1024 /* For a CONST_VECTOR, return the number of elements in a vector. */
1025 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1027 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1028 SUBREG_BYTE extracts the byte-number. */
1030 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1031 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1033 /* in rtlanal.c */
1034 extern unsigned int subreg_lsb PARAMS ((rtx));
1035 extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
1036 enum machine_mode,
1037 unsigned int,
1038 enum machine_mode));
1039 extern unsigned int subreg_regno PARAMS ((rtx));
1041 /* 1 if RTX is a subreg containing a reg that is already known to be
1042 sign- or zero-extended from the mode of the subreg to the mode of
1043 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1044 extension.
1046 When used as a LHS, is means that this extension must be done
1047 when assigning to SUBREG_REG. */
1049 #define SUBREG_PROMOTED_VAR_P(RTX) \
1050 (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1052 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL) \
1053 do { \
1054 rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
1055 if ((VAL) < 0) \
1056 _rtx->volatil = 1; \
1057 else { \
1058 _rtx->volatil = 0; \
1059 _rtx->unchanging = (VAL); \
1061 } while (0)
1062 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1063 ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1064 ? -1 : (RTX)->unchanging)
1066 /* Access various components of an ASM_OPERANDS rtx. */
1068 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1069 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1070 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1071 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1072 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1073 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1074 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1075 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1076 XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1077 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1078 XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1079 #define ASM_OPERANDS_INPUT_MODE(RTX, N) \
1080 GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1081 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR (RTX, 5, ASM_OPERANDS)
1082 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT (RTX, 6, ASM_OPERANDS)
1084 /* 1 if RTX is a mem and we should keep the alias set for this mem
1085 unchanged when we access a component. Set to 1, or example, when we
1086 are already in a non-addressable component of an aggregate. */
1087 #define MEM_KEEP_ALIAS_SET_P(RTX) \
1088 (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1090 /* 1 if RTX is a mem or asm_operand for a volatile reference. */
1091 #define MEM_VOLATILE_P(RTX) \
1092 (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS, \
1093 ASM_INPUT)->volatil)
1095 /* 1 if RTX is a mem that refers to an aggregate, either to the
1096 aggregate itself of to a field of the aggregate. If zero, RTX may
1097 or may not be such a reference. */
1098 #define MEM_IN_STRUCT_P(RTX) \
1099 (RTL_FLAG_CHECK1("MEM_IN_STRUCT_P", (RTX), MEM)->in_struct)
1101 /* 1 if RTX is a mem that refers to a scalar. If zero, RTX may or may
1102 not refer to a scalar. */
1103 #define MEM_SCALAR_P(RTX) \
1104 (RTL_FLAG_CHECK1("MEM_SCALAR_P", (RTX), MEM)->frame_related)
1106 /* If VAL is nonzero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
1107 RTX. Otherwise, vice versa. Use this macro only when you are
1108 *sure* that you know that the MEM is in a structure, or is a
1109 scalar. VAL is evaluated only once. */
1110 #define MEM_SET_IN_STRUCT_P(RTX, VAL) \
1111 do { \
1112 if (VAL) \
1114 MEM_IN_STRUCT_P (RTX) = 1; \
1115 MEM_SCALAR_P (RTX) = 0; \
1117 else \
1119 MEM_IN_STRUCT_P (RTX) = 0; \
1120 MEM_SCALAR_P (RTX) = 1; \
1122 } while (0)
1124 /* The memory attribute block. We provide access macros for each value
1125 in the block and provide defaults if none specified. */
1126 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1128 /* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
1129 set, and may alias anything. Otherwise, the MEM can only alias
1130 MEMs in the same alias set. This value is set in a
1131 language-dependent manner in the front-end, and should not be
1132 altered in the back-end. These set numbers are tested for zero,
1133 and compared for equality; they have no other significance. In
1134 some front-ends, these numbers may correspond in some way to types,
1135 or other language-level entities, but they need not, and the
1136 back-end makes no such assumptions. */
1137 #define MEM_ALIAS_SET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->alias)
1139 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1140 refer to part of a DECL. It may also be a COMPONENT_REF. */
1141 #define MEM_EXPR(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->expr)
1143 /* For a MEM rtx, the offset from the start of MEM_EXPR, if known, as a
1144 RTX that is always a CONST_INT. */
1145 #define MEM_OFFSET(RTX) (MEM_ATTRS (RTX) == 0 ? 0 : MEM_ATTRS (RTX)->offset)
1147 /* For a MEM rtx, the size in bytes of the MEM, if known, as an RTX that
1148 is always a CONST_INT. */
1149 #define MEM_SIZE(RTX) \
1150 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->size \
1151 : GET_MODE (RTX) != BLKmode ? GEN_INT (GET_MODE_SIZE (GET_MODE (RTX))) \
1152 : 0)
1154 /* For a MEM rtx, the alignment in bits. We can use the alignment of the
1155 mode as a default when STRICT_ALIGNMENT, but not if not. */
1156 #define MEM_ALIGN(RTX) \
1157 (MEM_ATTRS (RTX) != 0 ? MEM_ATTRS (RTX)->align \
1158 : (STRICT_ALIGNMENT && GET_MODE (RTX) != BLKmode \
1159 ? GET_MODE_ALIGNMENT (GET_MODE (RTX)) : BITS_PER_UNIT))
1161 /* Copy the attributes that apply to memory locations from RHS to LHS. */
1162 #define MEM_COPY_ATTRIBUTES(LHS, RHS) \
1163 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
1164 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
1165 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
1166 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS), \
1167 MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS), \
1168 MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1170 /* 1 if RTX is a label_ref to a label outside the loop containing the
1171 reference. */
1172 #define LABEL_OUTSIDE_LOOP_P(RTX) \
1173 (RTL_FLAG_CHECK1("LABEL_OUTSIDE_LOOP_P", (RTX), LABEL_REF)->in_struct)
1175 /* 1 if RTX is a label_ref for a nonlocal label. */
1176 /* Likewise in an expr_list for a reg_label note. */
1177 #define LABEL_REF_NONLOCAL_P(RTX) \
1178 (RTL_FLAG_CHECK2("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF, \
1179 REG_LABEL)->volatil)
1181 /* 1 if RTX is a code_label that should always be considered to be needed. */
1182 #define LABEL_PRESERVE_P(RTX) \
1183 (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1185 /* 1 if RTX is a reg that is used only in an exit test of a loop. */
1186 #define REG_LOOP_TEST_P(RTX) \
1187 (RTL_FLAG_CHECK1("REG_LOOP_TEST_P", (RTX), REG)->in_struct)
1189 /* During sched, 1 if RTX is an insn that must be scheduled together
1190 with the preceding insn. */
1191 #define SCHED_GROUP_P(RTX) \
1192 (RTL_FLAG_CHECK3("SCHED_GROUP_P", (RTX), INSN, JUMP_INSN, CALL_INSN \
1193 )->in_struct)
1195 /* For a SET rtx, SET_DEST is the place that is set
1196 and SET_SRC is the value it is set to. */
1197 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1198 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1199 #define SET_IS_RETURN_P(RTX) \
1200 (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1202 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
1203 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1204 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1206 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1207 conditionally executing the code on, COND_EXEC_CODE is the code
1208 to execute if the condition is true. */
1209 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1210 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1212 /* 1 if RTX is a symbol_ref that addresses this function's constants pool. */
1213 #define CONSTANT_POOL_ADDRESS_P(RTX) \
1214 (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1216 /* 1 if RTX is a symbol_ref that addresses this function's string constant
1217 pool */
1218 #define STRING_POOL_ADDRESS_P(RTX) \
1219 (RTL_FLAG_CHECK1("STRING_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->frame_related)
1221 /* Used if RTX is a symbol_ref, for machine-specific purposes. */
1222 #define SYMBOL_REF_FLAG(RTX) \
1223 (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1225 /* 1 if RTX is a symbol_ref that has been the library function in
1226 emit_library_call. */
1227 #define SYMBOL_REF_USED(RTX) \
1228 (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1230 /* 1 if RTX is a symbol_ref for a weak symbol. */
1231 #define SYMBOL_REF_WEAK(RTX) \
1232 (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->integrated)
1234 /* Define a macro to look for REG_INC notes,
1235 but save time on machines where they never exist. */
1237 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1238 #define FIND_REG_INC_NOTE(INSN, REG) \
1239 ((REG) != NULL_RTX && REG_P ((REG)) \
1240 ? find_regno_note ((INSN), REG_INC, REGNO (REG)) \
1241 : find_reg_note ((INSN), REG_INC, (REG)))
1242 #else
1243 #define FIND_REG_INC_NOTE(INSN, REG) 0
1244 #endif
1246 /* Indicate whether the machine has any sort of auto increment addressing.
1247 If not, we can avoid checking for REG_INC notes. */
1249 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
1250 #define AUTO_INC_DEC
1251 #endif
1253 #ifndef HAVE_PRE_INCREMENT
1254 #define HAVE_PRE_INCREMENT 0
1255 #endif
1257 #ifndef HAVE_PRE_DECREMENT
1258 #define HAVE_PRE_DECREMENT 0
1259 #endif
1261 #ifndef HAVE_POST_INCREMENT
1262 #define HAVE_POST_INCREMENT 0
1263 #endif
1265 #ifndef HAVE_POST_DECREMENT
1266 #define HAVE_POST_DECREMENT 0
1267 #endif
1269 #ifndef HAVE_POST_MODIFY_DISP
1270 #define HAVE_POST_MODIFY_DISP 0
1271 #endif
1273 #ifndef HAVE_POST_MODIFY_REG
1274 #define HAVE_POST_MODIFY_REG 0
1275 #endif
1277 #ifndef HAVE_PRE_MODIFY_DISP
1278 #define HAVE_PRE_MODIFY_DISP 0
1279 #endif
1281 #ifndef HAVE_PRE_MODIFY_REG
1282 #define HAVE_PRE_MODIFY_REG 0
1283 #endif
1286 /* Some architectures do not have complete pre/post increment/decrement
1287 instruction sets, or only move some modes efficiently. These macros
1288 allow us to tune autoincrement generation. */
1290 #ifndef USE_LOAD_POST_INCREMENT
1291 #define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1292 #endif
1294 #ifndef USE_LOAD_POST_DECREMENT
1295 #define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1296 #endif
1298 #ifndef USE_LOAD_PRE_INCREMENT
1299 #define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1300 #endif
1302 #ifndef USE_LOAD_PRE_DECREMENT
1303 #define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1304 #endif
1306 #ifndef USE_STORE_POST_INCREMENT
1307 #define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1308 #endif
1310 #ifndef USE_STORE_POST_DECREMENT
1311 #define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1312 #endif
1314 #ifndef USE_STORE_PRE_INCREMENT
1315 #define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1316 #endif
1318 #ifndef USE_STORE_PRE_DECREMENT
1319 #define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1320 #endif
1322 /* Determine if the insn is a PHI node. */
1323 #define PHI_NODE_P(X) \
1324 ((X) && GET_CODE (X) == INSN \
1325 && GET_CODE (PATTERN (X)) == SET \
1326 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1328 /* Nonzero if we need to distinguish between the return value of this function
1329 and the return value of a function called by this function. This helps
1330 integrate.c.
1331 This is 1 until after the rtl generation pass. */
1332 extern int rtx_equal_function_value_matters;
1334 /* Nonzero when we are generating CONCATs. */
1335 extern int generating_concat_p;
1337 /* Generally useful functions. */
1339 /* In expmed.c */
1340 extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
1342 #define plus_constant(X, C) plus_constant_wide ((X), (HOST_WIDE_INT) (C))
1344 /* In builtins.c */
1345 extern rtx expand_builtin_expect_jump PARAMS ((tree, rtx, rtx));
1347 /* In explow.c */
1348 extern void set_stack_check_libfunc PARAMS ((rtx));
1349 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1350 enum machine_mode));
1351 extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1352 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1353 extern void optimize_save_area_alloca PARAMS ((rtx));
1355 /* In emit-rtl.c */
1356 extern rtx gen_rtx PARAMS ((enum rtx_code,
1357 enum machine_mode, ...));
1358 extern rtvec gen_rtvec PARAMS ((int, ...));
1359 extern rtx copy_insn_1 PARAMS ((rtx));
1360 extern rtx copy_insn PARAMS ((rtx));
1361 extern rtx gen_int_mode PARAMS ((HOST_WIDE_INT,
1362 enum machine_mode));
1363 extern rtx emit_copy_of_insn_after PARAMS ((rtx, rtx));
1365 /* In rtl.c */
1366 extern rtx rtx_alloc PARAMS ((RTX_CODE));
1367 extern rtvec rtvec_alloc PARAMS ((int));
1368 extern rtx copy_rtx PARAMS ((rtx));
1370 /* In emit-rtl.c */
1371 extern rtx copy_rtx_if_shared PARAMS ((rtx));
1373 /* In rtl.c */
1374 extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1375 extern rtx shallow_copy_rtx PARAMS ((rtx));
1376 extern int rtx_equal_p PARAMS ((rtx, rtx));
1378 /* In emit-rtl.c */
1379 extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1380 extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1381 extern rtx gen_label_rtx PARAMS ((void));
1382 extern int subreg_hard_regno PARAMS ((rtx, int));
1383 extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1384 extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
1386 /* In cse.c */
1387 extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
1389 /* In emit-rtl.c */
1390 extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1391 extern rtx gen_highpart_mode PARAMS ((enum machine_mode,
1392 enum machine_mode, rtx));
1393 extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1394 extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
1395 extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1396 enum machine_mode));
1397 extern rtx constant_subword PARAMS ((rtx, int,
1398 enum machine_mode));
1400 /* In emit-rtl.c */
1401 extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1402 enum machine_mode));
1403 extern int subreg_lowpart_p PARAMS ((rtx));
1404 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1405 enum machine_mode));
1406 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1407 enum machine_mode));
1408 extern rtx make_safe_from PARAMS ((rtx, rtx));
1409 extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
1410 extern rtx get_insns PARAMS ((void));
1411 extern const char *get_insn_name PARAMS ((int));
1412 extern rtx get_last_insn PARAMS ((void));
1413 extern rtx get_last_insn_anywhere PARAMS ((void));
1414 extern rtx get_first_nonnote_insn PARAMS ((void));
1415 extern rtx get_last_nonnote_insn PARAMS ((void));
1416 extern void start_sequence PARAMS ((void));
1417 extern void push_to_sequence PARAMS ((rtx));
1418 extern void end_sequence PARAMS ((void));
1419 extern void push_to_full_sequence PARAMS ((rtx, rtx));
1420 extern void end_full_sequence PARAMS ((rtx*, rtx*));
1422 /* In varasm.c */
1423 extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1424 extern rtx mem_for_const_double PARAMS ((rtx));
1425 extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
1427 /* In varasm.c */
1428 extern rtx get_pool_constant PARAMS ((rtx));
1429 extern rtx get_pool_constant_mark PARAMS ((rtx, bool *));
1430 extern enum machine_mode get_pool_mode PARAMS ((rtx));
1431 extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1432 extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1433 extern int get_pool_offset PARAMS ((rtx));
1434 extern rtx simplify_subtraction PARAMS ((rtx));
1436 /* In function.c */
1437 extern rtx assign_stack_local PARAMS ((enum machine_mode,
1438 HOST_WIDE_INT, int));
1439 extern rtx assign_stack_temp PARAMS ((enum machine_mode,
1440 HOST_WIDE_INT, int));
1441 extern rtx assign_stack_temp_for_type PARAMS ((enum machine_mode,
1442 HOST_WIDE_INT, int, tree));
1443 extern rtx assign_temp PARAMS ((tree, int, int, int));
1444 /* In emit-rtl.c */
1445 extern rtx emit_insn_before PARAMS ((rtx, rtx));
1446 extern rtx emit_insn_before_scope PARAMS ((rtx, rtx, tree));
1447 extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1448 extern rtx emit_jump_insn_before_scope PARAMS ((rtx, rtx, tree));
1449 extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1450 extern rtx emit_call_insn_before_scope PARAMS ((rtx, rtx, tree));
1451 extern rtx emit_barrier_before PARAMS ((rtx));
1452 extern rtx emit_label_before PARAMS ((rtx, rtx));
1453 extern rtx emit_note_before PARAMS ((int, rtx));
1454 extern rtx emit_insn_after PARAMS ((rtx, rtx));
1455 extern rtx emit_insn_after_scope PARAMS ((rtx, rtx, tree));
1456 extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1457 extern rtx emit_jump_insn_after_scope PARAMS ((rtx, rtx, tree));
1458 extern rtx emit_call_insn_after PARAMS ((rtx, rtx));
1459 extern rtx emit_call_insn_after_scope PARAMS ((rtx, rtx, tree));
1460 extern rtx emit_barrier_after PARAMS ((rtx));
1461 extern rtx emit_label_after PARAMS ((rtx, rtx));
1462 extern rtx emit_note_after PARAMS ((int, rtx));
1463 extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
1464 extern rtx emit_insn PARAMS ((rtx));
1465 extern rtx emit_jump_insn PARAMS ((rtx));
1466 extern rtx emit_call_insn PARAMS ((rtx));
1467 extern rtx emit_label PARAMS ((rtx));
1468 extern rtx emit_barrier PARAMS ((void));
1469 extern rtx emit_line_note PARAMS ((const char *, int));
1470 extern rtx emit_note PARAMS ((const char *, int));
1471 extern rtx emit_line_note_force PARAMS ((const char *, int));
1472 extern rtx make_insn_raw PARAMS ((rtx));
1473 extern rtx previous_insn PARAMS ((rtx));
1474 extern rtx next_insn PARAMS ((rtx));
1475 extern rtx prev_nonnote_insn PARAMS ((rtx));
1476 extern rtx next_nonnote_insn PARAMS ((rtx));
1477 extern rtx prev_real_insn PARAMS ((rtx));
1478 extern rtx next_real_insn PARAMS ((rtx));
1479 extern rtx prev_active_insn PARAMS ((rtx));
1480 extern rtx next_active_insn PARAMS ((rtx));
1481 extern int active_insn_p PARAMS ((rtx));
1482 extern rtx prev_label PARAMS ((rtx));
1483 extern rtx next_label PARAMS ((rtx));
1484 extern rtx next_cc0_user PARAMS ((rtx));
1485 extern rtx prev_cc0_setter PARAMS ((rtx));
1487 /* In cfglayout.c */
1488 extern tree choose_inner_scope PARAMS ((tree, tree));
1490 /* In jump.c */
1491 extern rtx next_nondeleted_insn PARAMS ((rtx));
1492 extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
1493 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1494 extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1495 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1496 extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
1497 extern void mark_jump_label PARAMS ((rtx, rtx, int));
1498 extern void cleanup_barriers PARAMS ((void));
1500 /* In jump.c */
1501 extern bool squeeze_notes PARAMS ((rtx *, rtx *));
1502 extern rtx delete_related_insns PARAMS ((rtx));
1503 extern void delete_jump PARAMS ((rtx));
1504 extern void delete_barrier PARAMS ((rtx));
1505 extern rtx get_label_before PARAMS ((rtx));
1506 extern rtx get_label_after PARAMS ((rtx));
1507 extern rtx follow_jumps PARAMS ((rtx));
1509 /* In recog.c */
1510 extern rtx *find_constant_term_loc PARAMS ((rtx *));
1512 /* In emit-rtl.c */
1513 extern rtx try_split PARAMS ((rtx, rtx, int));
1514 extern int split_branch_probability;
1516 /* In unknown file */
1517 extern rtx split_insns PARAMS ((rtx, rtx));
1519 /* In simplify-rtx.c */
1520 extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1521 enum machine_mode, rtx,
1522 enum machine_mode));
1523 extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1524 enum machine_mode, rtx,
1525 rtx));
1526 extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1527 enum machine_mode,
1528 enum machine_mode, rtx, rtx,
1529 rtx));
1530 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1531 enum machine_mode, rtx,
1532 rtx));
1533 extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1534 enum machine_mode,
1535 rtx, rtx));
1536 extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1537 enum machine_mode, rtx,
1538 enum machine_mode));
1539 extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1540 enum machine_mode,
1541 enum machine_mode,
1542 rtx, rtx, rtx));
1543 extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
1544 enum machine_mode,
1545 enum machine_mode,
1546 rtx, rtx));
1547 extern rtx simplify_subreg PARAMS ((enum machine_mode,
1548 rtx,
1549 enum machine_mode,
1550 unsigned int));
1551 extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1552 rtx,
1553 enum machine_mode,
1554 unsigned int));
1555 extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
1556 extern rtx simplify_rtx PARAMS ((rtx));
1557 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1559 /* In function.c */
1560 extern rtx gen_mem_addressof PARAMS ((rtx, tree));
1562 /* In regclass.c */
1563 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1564 unsigned int));
1566 /* In emit-rtl.c */
1567 extern rtx set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
1569 /* Functions in rtlanal.c */
1571 /* Single set is implemented as macro for performance reasons. */
1572 #define single_set(I) (INSN_P (I) \
1573 ? (GET_CODE (PATTERN (I)) == SET \
1574 ? PATTERN (I) : single_set_1 (I)) \
1575 : NULL_RTX)
1576 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1578 extern int rtx_addr_can_trap_p PARAMS ((rtx));
1579 extern int rtx_unstable_p PARAMS ((rtx));
1580 extern int rtx_varies_p PARAMS ((rtx, int));
1581 extern int rtx_addr_varies_p PARAMS ((rtx, int));
1582 extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1583 extern rtx get_related_value PARAMS ((rtx));
1584 extern rtx get_jump_table_offset PARAMS ((rtx, rtx *));
1585 extern int global_reg_mentioned_p PARAMS ((rtx));
1586 extern int reg_mentioned_p PARAMS ((rtx, rtx));
1587 extern int count_occurrences PARAMS ((rtx, rtx, int));
1588 extern int reg_referenced_p PARAMS ((rtx, rtx));
1589 extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1590 extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1591 extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1592 extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
1593 extern int commutative_operand_precedence PARAMS ((rtx));
1594 extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
1595 extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1596 extern int no_labels_between_p PARAMS ((rtx, rtx));
1597 extern int no_jumps_between_p PARAMS ((rtx, rtx));
1598 extern int modified_in_p PARAMS ((rtx, rtx));
1599 extern int insn_dependent_p PARAMS ((rtx, rtx));
1600 extern int reg_set_p PARAMS ((rtx, rtx));
1601 extern rtx single_set_2 PARAMS ((rtx, rtx));
1602 extern int multiple_sets PARAMS ((rtx));
1603 extern int set_noop_p PARAMS ((rtx));
1604 extern int noop_move_p PARAMS ((rtx));
1605 extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
1606 extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1607 rtx, rtx *));
1608 extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
1609 extern rtx set_of PARAMS ((rtx, rtx));
1610 extern void note_stores PARAMS ((rtx,
1611 void (*) (rtx, rtx, void *),
1612 void *));
1613 extern void note_uses PARAMS ((rtx *,
1614 void (*) (rtx *, void *),
1615 void *));
1616 extern rtx reg_set_last PARAMS ((rtx, rtx));
1617 extern int dead_or_set_p PARAMS ((rtx, rtx));
1618 extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
1619 extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
1620 extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1621 unsigned int));
1622 extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
1623 extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
1624 extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1625 unsigned int));
1626 extern int pure_call_p PARAMS ((rtx));
1627 extern void remove_note PARAMS ((rtx, rtx));
1628 extern int side_effects_p PARAMS ((rtx));
1629 extern int volatile_refs_p PARAMS ((rtx));
1630 extern int volatile_insn_p PARAMS ((rtx));
1631 extern int may_trap_p PARAMS ((rtx));
1632 extern int inequality_comparisons_p PARAMS ((rtx));
1633 extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
1634 extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1635 int));
1636 extern int computed_jump_p PARAMS ((rtx));
1637 typedef int (*rtx_function) PARAMS ((rtx *, void *));
1638 extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
1639 extern rtx regno_use_in PARAMS ((unsigned int, rtx));
1640 extern int auto_inc_p PARAMS ((rtx));
1641 extern int in_expr_list_p PARAMS ((rtx, rtx));
1642 extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1643 extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
1644 extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
1645 extern rtx find_first_parameter_load PARAMS ((rtx, rtx));
1646 extern bool keep_with_call_p PARAMS ((rtx));
1648 /* flow.c */
1650 extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1652 /* lists.c */
1654 void free_EXPR_LIST_list PARAMS ((rtx *));
1655 void free_INSN_LIST_list PARAMS ((rtx *));
1656 void free_EXPR_LIST_node PARAMS ((rtx));
1657 void free_INSN_LIST_node PARAMS ((rtx));
1658 rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1659 rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
1661 /* regclass.c */
1663 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1664 Always at least 3, since the combiner could put that many togetherm
1665 and we want this to remain correct for all the remaining passes. */
1667 extern int max_parallel;
1669 /* Free up register info memory. */
1670 extern void free_reg_info PARAMS ((void));
1672 /* recog.c */
1673 extern int asm_noperands PARAMS ((rtx));
1674 extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
1675 const char **,
1676 enum machine_mode *));
1678 extern enum reg_class reg_preferred_class PARAMS ((int));
1679 extern enum reg_class reg_alternate_class PARAMS ((int));
1681 extern rtx get_first_nonparm_insn PARAMS ((void));
1683 extern void split_all_insns PARAMS ((int));
1684 extern void split_all_insns_noflow PARAMS ((void));
1686 #define MAX_SAVED_CONST_INT 64
1687 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1689 #define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1690 #define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1691 #define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1692 #define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
1693 extern GTY(()) rtx const_true_rtx;
1695 extern GTY(()) rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1697 /* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
1698 same as VOIDmode. */
1700 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1702 /* Likewise, for the constants 1 and 2. */
1704 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1705 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1707 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1708 is used to represent the frame pointer. This is because the
1709 hard frame pointer and the automatic variables are separated by an amount
1710 that cannot be determined until after register allocation. We can assume
1711 that in this case ELIMINABLE_REGS will be defined, one action of which
1712 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1713 #ifndef HARD_FRAME_POINTER_REGNUM
1714 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1715 #endif
1717 /* Index labels for global_rtl. */
1718 enum global_rtl_index
1720 GR_PC,
1721 GR_CC0,
1722 GR_STACK_POINTER,
1723 GR_FRAME_POINTER,
1724 /* For register elimination to work properly these hard_frame_pointer_rtx,
1725 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1726 the same register. */
1727 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1728 GR_ARG_POINTER = GR_FRAME_POINTER,
1729 #endif
1730 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1731 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1732 #else
1733 GR_HARD_FRAME_POINTER,
1734 #endif
1735 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1736 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1737 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1738 #else
1739 GR_ARG_POINTER,
1740 #endif
1741 #endif
1742 GR_VIRTUAL_INCOMING_ARGS,
1743 GR_VIRTUAL_STACK_ARGS,
1744 GR_VIRTUAL_STACK_DYNAMIC,
1745 GR_VIRTUAL_OUTGOING_ARGS,
1746 GR_VIRTUAL_CFA,
1748 GR_MAX
1751 /* Pointers to standard pieces of rtx are stored here. */
1752 extern GTY(()) rtx global_rtl[GR_MAX];
1754 /* Standard pieces of rtx, to be substituted directly into things. */
1755 #define pc_rtx (global_rtl[GR_PC])
1756 #define cc0_rtx (global_rtl[GR_CC0])
1758 /* All references to certain hard regs, except those created
1759 by allocating pseudo regs into them (when that's possible),
1760 go through these unique rtx objects. */
1761 #define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1762 #define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1763 #define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1764 #define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
1766 extern GTY(()) rtx pic_offset_table_rtx;
1767 extern GTY(()) rtx struct_value_rtx;
1768 extern GTY(()) rtx struct_value_incoming_rtx;
1769 extern GTY(()) rtx static_chain_rtx;
1770 extern GTY(()) rtx static_chain_incoming_rtx;
1771 extern GTY(()) rtx return_address_pointer_rtx;
1773 /* Include the RTL generation functions. */
1775 #ifndef NO_GENRTL_H
1776 #include "genrtl.h"
1777 #endif
1779 /* There are some RTL codes that require special attention; the
1780 generation functions included above do the raw handling. If you
1781 add to this list, modify special_rtx in gengenrtl.c as well. You
1782 should also modify gen_rtx to use the special function. */
1784 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1785 extern rtx gen_rtx_CONST_VECTOR PARAMS ((enum machine_mode, rtvec));
1786 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1787 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, unsigned));
1788 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1789 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1791 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1793 /* We need the cast here to ensure that we get the same result both with
1794 and without prototypes. */
1795 #define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1797 /* Virtual registers are used during RTL generation to refer to locations into
1798 the stack frame when the actual location isn't known until RTL generation
1799 is complete. The routine instantiate_virtual_regs replaces these with
1800 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1801 a constant. */
1803 #define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1805 /* This points to the first word of the incoming arguments passed on the stack,
1806 either by the caller or by the callee when pretending it was passed by the
1807 caller. */
1809 #define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1811 #define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1813 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1814 variable on the stack. Otherwise, it points to the first variable on
1815 the stack. */
1817 #define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
1819 #define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1821 /* This points to the location of dynamically-allocated memory on the stack
1822 immediately after the stack pointer has been adjusted by the amount
1823 desired. */
1825 #define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1827 #define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1829 /* This points to the location in the stack at which outgoing arguments should
1830 be written when the stack is pre-pushed (arguments pushed using push
1831 insns always use sp). */
1833 #define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1835 #define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1837 /* This points to the Canonical Frame Address of the function. This
1838 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1839 but is calculated relative to the arg pointer for simplicity; the
1840 frame pointer nor stack pointer are necessarily fixed relative to
1841 the CFA until after reload. */
1843 #define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
1845 #define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1847 #define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
1849 /* Nonzero if REGNUM is a pointer into the stack frame. */
1850 #define REGNO_PTR_FRAME_P(REGNUM) \
1851 ((REGNUM) == STACK_POINTER_REGNUM \
1852 || (REGNUM) == FRAME_POINTER_REGNUM \
1853 || (REGNUM) == HARD_FRAME_POINTER_REGNUM \
1854 || (REGNUM) == ARG_POINTER_REGNUM \
1855 || ((REGNUM) >= FIRST_VIRTUAL_REGISTER \
1856 && (REGNUM) <= LAST_VIRTUAL_REGISTER))
1858 /* REGNUM never really appearing in the INSN stream. */
1859 #define INVALID_REGNUM (~(unsigned int) 0)
1861 extern rtx find_next_ref PARAMS ((rtx, rtx));
1863 extern rtx output_constant_def PARAMS ((tree, int));
1865 /* Define a default value for STORE_FLAG_VALUE. */
1867 #ifndef STORE_FLAG_VALUE
1868 #define STORE_FLAG_VALUE 1
1869 #endif
1871 /* Nonzero after the second flow pass has completed.
1872 Set to 1 or 0 by toplev.c */
1873 extern int flow2_completed;
1875 /* Nonzero after end of reload pass.
1876 Set to 1 or 0 by reload1.c. */
1878 extern int reload_completed;
1880 /* Set to 1 while reload_as_needed is operating.
1881 Required by some machines to handle any generated moves differently. */
1883 extern int reload_in_progress;
1885 /* If this is nonzero, we do not bother generating VOLATILE
1886 around volatile memory references, and we are willing to
1887 output indirect addresses. If cse is to follow, we reject
1888 indirect addresses so a useful potential cse is generated;
1889 if it is used only once, instruction combination will produce
1890 the same indirect address eventually. */
1891 extern int cse_not_expected;
1893 /* Set to nonzero before life analysis to indicate that it is unsafe to
1894 generate any new pseudo registers. */
1895 extern int no_new_pseudos;
1897 /* Translates rtx code to tree code, for those codes needed by
1898 REAL_ARITHMETIC. The function returns an int because the caller may not
1899 know what `enum tree_code' means. */
1901 extern int rtx_to_tree_code PARAMS ((enum rtx_code));
1903 /* In tree.c */
1904 struct obstack;
1905 extern void gcc_obstack_init PARAMS ((struct obstack *));
1907 /* In cse.c */
1908 struct cse_basic_block_data;
1910 /* Return the right cost to give to an operation
1911 to make the cost of the corresponding register-to-register instruction
1912 N times that of a fast register-to-register instruction. */
1913 #define COSTS_N_INSNS(N) ((N) * 4)
1915 /* Maximum cost of a rtl expression. This value has the special meaning
1916 not to use an rtx with this cost under any circumstances. */
1917 #define MAX_COST INT_MAX
1919 extern int rtx_cost PARAMS ((rtx, enum rtx_code));
1920 extern int address_cost PARAMS ((rtx, enum machine_mode));
1921 extern int delete_trivially_dead_insns PARAMS ((rtx, int));
1922 #ifdef BUFSIZ
1923 extern int cse_main PARAMS ((rtx, int, int, FILE *));
1924 #endif
1925 extern void cse_end_of_basic_block PARAMS ((rtx,
1926 struct cse_basic_block_data *,
1927 int, int, int));
1929 /* In jump.c */
1930 extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1931 extern int condjump_p PARAMS ((rtx));
1932 extern int any_condjump_p PARAMS ((rtx));
1933 extern int any_uncondjump_p PARAMS ((rtx));
1934 extern int safe_to_remove_jump_p PARAMS ((rtx));
1935 extern rtx pc_set PARAMS ((rtx));
1936 extern rtx condjump_label PARAMS ((rtx));
1937 extern int simplejump_p PARAMS ((rtx));
1938 extern int returnjump_p PARAMS ((rtx));
1939 extern int onlyjump_p PARAMS ((rtx));
1940 extern int only_sets_cc0_p PARAMS ((rtx));
1941 extern int sets_cc0_p PARAMS ((rtx));
1942 extern int invert_jump_1 PARAMS ((rtx, rtx));
1943 extern int invert_jump PARAMS ((rtx, rtx, int));
1944 extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1945 extern int true_regnum PARAMS ((rtx));
1946 extern unsigned int reg_or_subregno PARAMS ((rtx));
1947 extern int redirect_jump_1 PARAMS ((rtx, rtx));
1948 extern int redirect_jump PARAMS ((rtx, rtx, int));
1949 extern void rebuild_jump_labels PARAMS ((rtx));
1950 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1951 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1952 rtx, rtx, rtx));
1953 extern void delete_for_peephole PARAMS ((rtx, rtx));
1954 extern int condjump_in_parallel_p PARAMS ((rtx));
1955 extern void never_reached_warning PARAMS ((rtx, rtx));
1956 extern void purge_line_number_notes PARAMS ((rtx));
1957 extern void copy_loop_headers PARAMS ((rtx));
1959 /* In emit-rtl.c. */
1960 extern int max_reg_num PARAMS ((void));
1961 extern int max_label_num PARAMS ((void));
1962 extern int get_first_label_num PARAMS ((void));
1963 extern void delete_insns_since PARAMS ((rtx));
1964 extern void mark_reg_pointer PARAMS ((rtx, int));
1965 extern void mark_user_reg PARAMS ((rtx));
1966 extern void reset_used_flags PARAMS ((rtx));
1967 extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1968 extern void reorder_insns_nobb PARAMS ((rtx, rtx, rtx));
1969 extern int get_max_uid PARAMS ((void));
1970 extern int in_sequence_p PARAMS ((void));
1971 extern void force_next_line_note PARAMS ((void));
1972 extern void init_emit PARAMS ((void));
1973 extern void init_emit_once PARAMS ((int));
1974 extern void push_topmost_sequence PARAMS ((void));
1975 extern void pop_topmost_sequence PARAMS ((void));
1976 extern int subreg_realpart_p PARAMS ((rtx));
1977 extern void reverse_comparison PARAMS ((rtx));
1978 extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1979 extern void set_new_first_and_last_label_num PARAMS ((int, int));
1980 extern void set_new_last_label_num PARAMS ((int));
1981 extern void unshare_all_rtl_again PARAMS ((rtx));
1982 extern void set_first_insn PARAMS ((rtx));
1983 extern void set_last_insn PARAMS ((rtx));
1984 extern void link_cc0_insns PARAMS ((rtx));
1985 extern void add_insn PARAMS ((rtx));
1986 extern void add_insn_before PARAMS ((rtx, rtx));
1987 extern void add_insn_after PARAMS ((rtx, rtx));
1988 extern void remove_insn PARAMS ((rtx));
1989 extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1990 extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1991 extern enum rtx_code classify_insn PARAMS ((rtx));
1992 extern rtx emit PARAMS ((rtx));
1993 /* Query and clear/ restore no_line_numbers. This is used by the
1994 switch / case handling in stmt.c to give proper line numbers in
1995 warnings about unreachable code. */
1996 int force_line_numbers PARAMS ((void));
1997 void restore_line_number_status PARAMS ((int old_value));
1998 extern void renumber_insns PARAMS ((FILE *));
1999 extern void remove_unnecessary_notes PARAMS ((void));
2000 extern rtx delete_insn PARAMS ((rtx));
2001 extern void delete_insn_chain PARAMS ((rtx, rtx));
2002 extern rtx delete_insn_and_edges PARAMS ((rtx));
2003 extern void delete_insn_chain_and_edges PARAMS ((rtx, rtx));
2005 /* In combine.c */
2006 extern int combine_instructions PARAMS ((rtx, unsigned int));
2007 extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
2008 extern rtx remove_death PARAMS ((unsigned int, rtx));
2009 #ifdef BUFSIZ
2010 extern void dump_combine_stats PARAMS ((FILE *));
2011 extern void dump_combine_total_stats PARAMS ((FILE *));
2012 #endif
2014 /* In sched.c. */
2015 #ifdef BUFSIZ
2016 extern void schedule_insns PARAMS ((FILE *));
2017 extern void schedule_ebbs PARAMS ((FILE *));
2018 #endif
2019 extern void fix_sched_param PARAMS ((const char *, const char *));
2021 /* In print-rtl.c */
2022 extern const char *print_rtx_head;
2023 extern void debug_rtx PARAMS ((rtx));
2024 extern void debug_rtx_list PARAMS ((rtx, int));
2025 extern void debug_rtx_range PARAMS ((rtx, rtx));
2026 extern rtx debug_rtx_find PARAMS ((rtx, int));
2027 #ifdef BUFSIZ
2028 extern void print_mem_expr PARAMS ((FILE *, tree));
2029 extern void print_rtl PARAMS ((FILE *, rtx));
2030 extern void print_simple_rtl PARAMS ((FILE *, rtx));
2031 extern int print_rtl_single PARAMS ((FILE *, rtx));
2032 extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
2033 #endif
2035 /* In loop.c */
2036 extern void init_loop PARAMS ((void));
2037 extern rtx libcall_other_reg PARAMS ((rtx, rtx));
2038 #ifdef BUFSIZ
2039 extern void loop_optimize PARAMS ((rtx, FILE *, int));
2040 #endif
2041 extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
2043 /* In function.c */
2044 extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
2045 extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
2046 extern int prologue_epilogue_contains PARAMS ((rtx));
2047 extern int sibcall_epilogue_contains PARAMS ((rtx));
2048 extern void preserve_rtl_expr_result PARAMS ((rtx));
2049 extern void mark_temp_addr_taken PARAMS ((rtx));
2050 extern void update_temp_slot_address PARAMS ((rtx, rtx));
2051 extern void purge_addressof PARAMS ((rtx));
2052 extern void purge_hard_subreg_sets PARAMS ((rtx));
2054 /* In stmt.c */
2055 extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
2056 extern void expand_null_return PARAMS ((void));
2057 extern void emit_jump PARAMS ((rtx));
2058 extern int preserve_subexpressions_p PARAMS ((void));
2060 /* In expr.c */
2061 extern void move_by_pieces PARAMS ((rtx, rtx,
2062 unsigned HOST_WIDE_INT,
2063 unsigned int));
2065 /* In flow.c */
2066 extern void recompute_reg_usage PARAMS ((rtx, int));
2067 extern int initialize_uninitialized_subregs PARAMS ((void));
2068 extern void delete_dead_jumptables PARAMS ((void));
2069 #ifdef BUFSIZ
2070 extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
2071 extern void dump_flow_info PARAMS ((FILE *));
2072 #endif
2074 /* In expmed.c */
2075 extern void init_expmed PARAMS ((void));
2076 extern void expand_inc PARAMS ((rtx, rtx));
2077 extern void expand_dec PARAMS ((rtx, rtx));
2078 extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
2079 unsigned HOST_WIDE_INT, rtx,
2080 int, int));
2082 /* In gcse.c */
2083 #ifdef BUFSIZ
2084 extern int gcse_main PARAMS ((rtx, FILE *));
2085 #endif
2087 /* In global.c */
2088 extern void mark_elimination PARAMS ((int, int));
2089 #ifdef BUFSIZ
2090 extern int global_alloc PARAMS ((FILE *));
2091 extern void dump_global_regs PARAMS ((FILE *));
2092 #endif
2093 #ifdef HARD_CONST
2094 extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
2095 #endif
2096 extern void build_insn_chain PARAMS ((rtx));
2098 /* In regclass.c */
2099 extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
2100 extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
2101 extern void globalize_reg PARAMS ((int));
2102 extern void init_regs PARAMS ((void));
2103 extern void init_fake_stack_mems PARAMS ((void));
2104 extern void init_reg_sets PARAMS ((void));
2105 extern void regset_release_memory PARAMS ((void));
2106 extern void regclass_init PARAMS ((void));
2107 extern void regclass PARAMS ((rtx, int, FILE *));
2108 extern void reg_scan PARAMS ((rtx, unsigned int, int));
2109 extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
2110 extern void fix_register PARAMS ((const char *, int, int));
2112 extern int delete_null_pointer_checks PARAMS ((rtx));
2114 /* In regmove.c */
2115 #ifdef BUFSIZ
2116 extern void regmove_optimize PARAMS ((rtx, int, FILE *));
2117 #endif
2118 extern void combine_stack_adjustments PARAMS ((void));
2120 /* In reorg.c */
2121 #ifdef BUFSIZ
2122 extern void dbr_schedule PARAMS ((rtx, FILE *));
2123 #endif
2125 /* In local-alloc.c */
2126 #ifdef BUFSIZ
2127 extern void dump_local_alloc PARAMS ((FILE *));
2128 #endif
2129 extern int local_alloc PARAMS ((void));
2130 extern int function_invariant_p PARAMS ((rtx));
2132 /* In profile.c */
2133 extern void init_branch_prob PARAMS ((const char *));
2134 extern void branch_prob PARAMS ((void));
2135 extern void end_branch_prob PARAMS ((void));
2136 extern void output_func_start_profiler PARAMS ((void));
2138 /* In reg-stack.c */
2139 #ifdef BUFSIZ
2140 extern void reg_to_stack PARAMS ((rtx, FILE *));
2141 #endif
2143 /* In fold-const.c */
2144 extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2145 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2146 unsigned HOST_WIDE_INT *,
2147 HOST_WIDE_INT *));
2148 extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2149 unsigned HOST_WIDE_INT *,
2150 HOST_WIDE_INT *));
2151 extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
2152 HOST_WIDE_INT,
2153 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2154 unsigned HOST_WIDE_INT *,
2155 HOST_WIDE_INT *));
2156 extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2157 HOST_WIDE_INT, unsigned int,
2158 unsigned HOST_WIDE_INT *,
2159 HOST_WIDE_INT *, int));
2160 extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2161 HOST_WIDE_INT, unsigned int,
2162 unsigned HOST_WIDE_INT *,
2163 HOST_WIDE_INT *, int));
2164 extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2165 HOST_WIDE_INT, unsigned int,
2166 unsigned HOST_WIDE_INT *,
2167 HOST_WIDE_INT *));
2168 extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
2169 HOST_WIDE_INT, unsigned int,
2170 unsigned HOST_WIDE_INT *,
2171 HOST_WIDE_INT *));
2173 /* In calls.c */
2174 enum libcall_type
2176 LCT_NORMAL = 0,
2177 LCT_CONST = 1,
2178 LCT_PURE = 2,
2179 LCT_CONST_MAKE_BLOCK = 3,
2180 LCT_PURE_MAKE_BLOCK = 4,
2181 LCT_NORETURN = 5,
2182 LCT_THROW = 6,
2183 LCT_ALWAYS_RETURN = 7,
2184 LCT_RETURNS_TWICE = 8
2187 extern void emit_library_call PARAMS ((rtx, enum libcall_type,
2188 enum machine_mode, int,
2189 ...));
2190 extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
2191 enum machine_mode, int,
2192 ...));
2194 /* In unroll.c */
2195 extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
2197 /* In varasm.c */
2198 extern int in_data_section PARAMS ((void));
2199 extern void init_varasm_once PARAMS ((void));
2201 /* In rtl.c */
2202 extern void init_rtl PARAMS ((void));
2203 extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
2204 void *));
2205 struct md_constant { char *name, *value; };
2207 #ifdef BUFSIZ
2208 extern int read_skip_spaces PARAMS ((FILE *));
2209 extern rtx read_rtx PARAMS ((FILE *));
2210 #endif
2212 extern const char *read_rtx_filename;
2213 extern int read_rtx_lineno;
2215 /* Redefine abort to report an internal error w/o coredump, and
2216 reporting the location of the error in the source file. This logic
2217 is duplicated in rtl.h and tree.h because every file that needs the
2218 special abort includes one or both. toplev.h gets too few files,
2219 system.h gets too many. */
2221 extern void fancy_abort PARAMS ((const char *, int, const char *))
2222 ATTRIBUTE_NORETURN;
2223 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
2225 /* In alias.c */
2226 extern void clear_reg_alias_info PARAMS ((rtx));
2227 extern rtx canon_rtx PARAMS ((rtx));
2228 extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2229 int (*)(rtx, int)));
2230 extern rtx get_addr PARAMS ((rtx));
2231 extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
2232 rtx, int (*)(rtx, int)));
2233 extern int read_dependence PARAMS ((rtx, rtx));
2234 extern int anti_dependence PARAMS ((rtx, rtx));
2235 extern int output_dependence PARAMS ((rtx, rtx));
2236 extern void mark_constant_function PARAMS ((void));
2237 extern void init_alias_once PARAMS ((void));
2238 extern void init_alias_analysis PARAMS ((void));
2239 extern void end_alias_analysis PARAMS ((void));
2240 extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
2242 /* In sibcall.c */
2243 typedef enum {
2244 sibcall_use_normal = 1,
2245 sibcall_use_tail_recursion,
2246 sibcall_use_sibcall
2247 } sibcall_use_t;
2249 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2250 extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2252 #ifdef STACK_REGS
2253 extern int stack_regs_mentioned PARAMS ((rtx insn));
2254 #endif
2256 /* In toplev.c */
2257 extern GTY(()) rtx stack_limit_rtx;
2259 /* In regrename.c */
2260 extern void regrename_optimize PARAMS ((void));
2261 extern void copyprop_hardreg_forward PARAMS ((void));
2263 /* In ifcvt.c */
2264 extern void if_convert PARAMS ((int));
2266 /* In predict.c */
2267 extern void invert_br_probabilities PARAMS ((rtx));
2268 extern bool expensive_function_p PARAMS ((int));
2269 /* In tracer.c */
2270 extern void tracer PARAMS ((void));
2271 #endif /* ! GCC_RTL_H */