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simplify_rtx.c (simplify_subreg): Keep subregs on return values...
[gcc.git] / gcc / rtl.h
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6f29feb1 1/* Register Transfer Language (RTL) definitions for GNU C-Compiler
af841dbd 2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
90a74703 3 1999, 2000, 2001 Free Software Foundation, Inc.
6f29feb1
JW		 4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING. If not, write to
e99215a3
RK		 19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA. */
6f29feb1 21
88657302
RH		 22#ifndef GCC_RTL_H
23#define GCC_RTL_H
6f29feb1 24
36edd3cc
BS		 25struct function;
26
6f29feb1
JW		 27#include "machmode.h"
28
29#undef FFS /* Some systems predefine this symbol; don't let it interfere. */
1cfc3092 30#undef FLOAT /* Likewise. */
ac889e46 31#undef ABS /* Likewise. */
71ae9cc6 32#undef PC /* Likewise. */
6f29feb1 33
88efc60a
RK		 34#ifndef TREE_CODE
35union tree_node;
36#endif
37
6f29feb1
JW		 38/* Register Transfer Language EXPRESSIONS CODES */
39
40#define RTX_CODE enum rtx_code
41enum 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
6dc42e49 47 LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
6f29feb1 48 NUM_RTX_CODE.
6dc42e49 49 Assumes default enum value assignment. */
6f29feb1
JW		 50
51#define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
52 /* The cast here, saves many elsewhere. */
53
aa0b4465 54extern const int rtx_length[];
0f41302f 55#define GET_RTX_LENGTH(CODE) (rtx_length[(int) (CODE)])
6f29feb1 56
5f06c983 57extern const char * const rtx_name[];
0f41302f 58#define GET_RTX_NAME(CODE) (rtx_name[(int) (CODE)])
6f29feb1 59
aa0b4465 60extern const char * const rtx_format[];
0f41302f 61#define GET_RTX_FORMAT(CODE) (rtx_format[(int) (CODE)])
6f29feb1 62
1f9a015e 63extern const char rtx_class[];
0f41302f 64#define GET_RTX_CLASS(CODE) (rtx_class[(int) (CODE)])
6f29feb1 65\f
33f7f353
JR		 66/* The flags and bitfields of an ADDR_DIFF_VEC. BASE is the base label
67 relative to which the offsets are calculated, as explained in rtl.def. */
68typedef struct
69{
70 /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
71 unsigned min_align: 8;
72 /* Flags: */
73 unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC. */
74 unsigned min_after_vec: 1; /* minimum address target label is after the ADDR_DIFF_VEC. */
75 unsigned max_after_vec: 1; /* maximum address target label is after the ADDR_DIFF_VEC. */
76 unsigned min_after_base: 1; /* minimum address target label is after BASE. */
77 unsigned max_after_base: 1; /* maximum address target label is after BASE. */
78 /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
79 unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned. */
80 unsigned : 2;
81 unsigned scale : 8;
82} addr_diff_vec_flags;
83
6f29feb1
JW		 84/* Common union for an element of an rtx. */
85
86typedef union rtunion_def
87{
5f4f0e22 88 HOST_WIDE_INT rtwint;
6f29feb1 89 int rtint;
770ae6cc 90 unsigned int rtuint;
3cce094d 91 const char *rtstr;
6f29feb1
JW		 92 struct rtx_def *rtx;
93 struct rtvec_def *rtvec;
94 enum machine_mode rttype;
33f7f353 95 addr_diff_vec_flags rt_addr_diff_vec_flags;
eab5c70a 96 struct cselib_val_struct *rt_cselib;
0dfa1860
MM		 97 struct bitmap_head_def *rtbit;
98 union tree_node *rttree;
e881bb1b 99 struct basic_block_def *bb;
6f29feb1
JW		 100} rtunion;
101
102/* RTL expression ("rtx"). */
103
104typedef struct rtx_def
105{
6f29feb1 106 /* The kind of expression this is. */
c149cc37 107 ENUM_BITFIELD(rtx_code) code: 16;
18def38f 108
6f29feb1 109 /* The kind of value the expression has. */
c149cc37
RL		 110 ENUM_BITFIELD(machine_mode) mode : 8;
111
0a1c58a2
JL		 112 /* 1 in an INSN if it can alter flow of control
113 within this function.
114 LINK_COST_ZERO in an INSN_LIST. */
6f29feb1 115 unsigned int jump : 1;
0a1c58a2
JL		 116 /* 1 in an INSN if it can call another function.
117 LINK_COST_FREE in an INSN_LIST. */
6f29feb1 118 unsigned int call : 1;
49982682
JW		 119 /* 1 in a REG if value of this expression will never change during
120 the current function, even though it is not manifestly constant.
121 1 in a MEM if contents of memory are constant. This does not
122 necessarily mean that the value of this expression is constant.
07be3989 123 1 in a SUBREG if it is from a promoted variable that is unsigned.
6f29feb1
JW		 124 1 in a SYMBOL_REF if it addresses something in the per-function
125 constants pool.
126 1 in a CALL_INSN if it is a const call.
127 1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
128 reorg until end of compilation; cleared before used. */
129 unsigned int unchanging : 1;
130 /* 1 in a MEM expression if contents of memory are volatile.
131 1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
132 if it is deleted.
133 1 in a REG expression if corresponds to a variable declared by the user.
134 0 for an internally generated temporary.
2a406d2a
RS		 135 In a SYMBOL_REF, this flag is used for machine-specific purposes.
136 In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
6f29feb1 137 unsigned int volatil : 1;
8358a974 138 /* 1 in a MEM referring to a field of an aggregate.
6f29feb1
JW		 139 0 if the MEM was a variable or the result of a * operator in C;
140 1 if it was the result of a . or -> operator (on a struct) in C.
141 1 in a REG if the register is used only in exit code a loop.
f590cca1 142 1 in a SUBREG expression if was generated from a variable with a
07be3989 143 promoted mode.
6f29feb1
JW		 144 1 in a CODE_LABEL if the label is used for nonlocal gotos
145 and must not be deleted even if its count is zero.
146 1 in a LABEL_REF if this is a reference to a label outside the
147 current loop.
148 1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
d45cf215 149 together with the preceding insn. Valid only within sched.
6f29feb1
JW		 150 1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
151 from the target of a branch. Valid from reorg until end of compilation;
b53978a3
JO		 152 cleared before used.
153 1 in an INSN if this insn is dead code. Valid only during
154 dead-code elimination phase; cleared before use. */
6f29feb1
JW		 155 unsigned int in_struct : 1;
156 /* 1 if this rtx is used. This is used for copying shared structure.
157 See `unshare_all_rtl'.
f590cca1 158 In a REG, this is not needed for that purpose, and used instead
6f29feb1
JW		 159 in `leaf_renumber_regs_insn'.
160 In a SYMBOL_REF, means that emit_library_call
161 has used it as the function. */
162 unsigned int used : 1;
163 /* Nonzero if this rtx came from procedure integration.
164 In a REG, nonzero means this reg refers to the return value
ff0b6b99
FS		 165 of the current function.
166 1 in a SYMBOL_REF if the symbol is weak. */
6f29feb1 167 unsigned integrated : 1;
b664de3a 168 /* 1 in an INSN or a SET if this rtx is related to the call frame,
c6df88cb 169 either changing how we compute the frame address or saving and
f590cca1 170 restoring registers in the prologue and epilogue.
c6df88cb 171 1 in a MEM if the MEM refers to a scalar, rather than a member of
bd7cf17e 172 an aggregate.
3502dc9c 173 1 in a REG if the register is a pointer.
bd7cf17e
JJ		 174 1 in a SYMBOL_REF if it addresses something in the per-function
175 constant string pool. */
469ac993 176 unsigned frame_related : 1;
0a25f1f5 177
6f29feb1
JW		 178 /* The first element of the operands of this rtx.
179 The number of operands and their types are controlled
180 by the `code' field, according to rtl.def. */
181 rtunion fld[1];
182} *rtx;
183
184#define NULL_RTX (rtx) 0
185
186/* Define macros to access the `code' field of the rtx. */
187
dbbbbf3b
JDA		 188#define GET_CODE(RTX) ((enum rtx_code) (RTX)->code)
189#define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
6f29feb1 190
dbbbbf3b
JDA		 191#define GET_MODE(RTX) ((enum machine_mode) (RTX)->mode)
192#define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
6f29feb1
JW		 193
194#define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
195#define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
469ac993 196#define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
6f29feb1
JW		 197
198/* RTL vector. These appear inside RTX's when there is a need
199 for a variable number of things. The principle use is inside
200 PARALLEL expressions. */
201
202typedef struct rtvec_def{
e9a25f70 203 int num_elem; /* number of elements */
8f985ec4 204 struct rtx_def *elem[1];
6f29feb1
JW		 205} *rtvec;
206
207#define NULL_RTVEC (rtvec) 0
208
209#define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
e9a25f70 210#define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (NUM))
6f29feb1 211
b53978a3 212/* Predicate yielding nonzero iff X is an rtl for a register. */
6f29feb1
JW		 213#define REG_P(X) (GET_CODE (X) == REG)
214
b53978a3
JO		 215/* Predicate yielding nonzero iff X is a label insn. */
216#define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
217
218/* Predicate yielding nonzero iff X is a jump insn. */
219#define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
220
221/* Predicate yielding nonzero iff X is a note insn. */
222#define NOTE_P(X) (GET_CODE (X) == NOTE)
223
224/* Predicate yielding nonzero iff X is a barrier insn. */
225#define BARRIER_P(X) (GET_CODE (X) == BARRIER)
226
227/* Predicate yielding nonzero iff X is a data for a jump table. */
228#define JUMP_TABLE_DATA_P(INSN) \
229 (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
230 GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
231
6f29feb1
JW		 232/* 1 if X is a constant value that is an integer. */
233
234#define CONSTANT_P(X) \
235 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
236 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
ee5332b8
RH		 237 || GET_CODE (X) == CONST || GET_CODE (X) == HIGH \
238 || GET_CODE (X) == CONSTANT_P_RTX)
6f29feb1
JW		 239
240/* General accessor macros for accessing the fields of an rtx. */
241
f4524c9e 242#if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
ef178af3
ZW		 243/* The bit with a star outside the statement expr and an & inside is
244 so that N can be evaluated only once. */
8784fdcd 245#define RTL_CHECK1(RTX, N, C1) __extension__ \
83ab3839 246(*({ rtx _rtx = (RTX); int _n = (N); \
ef178af3
ZW		 247 enum rtx_code _code = GET_CODE (_rtx); \
248 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
fbfc1192 249 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
ef178af3 250 if (GET_RTX_FORMAT(_code)[_n] != C1) \
fbfc1192 251 rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
ef178af3
ZW		 252 &_rtx->fld[_n]; }))
253
8784fdcd 254#define RTL_CHECK2(RTX, N, C1, C2) __extension__ \
83ab3839 255(*({ rtx _rtx = (RTX); int _n = (N); \
ef178af3
ZW		 256 enum rtx_code _code = GET_CODE (_rtx); \
257 if (_n < 0 || _n >= GET_RTX_LENGTH (_code)) \
fbfc1192 258 rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
ef178af3
ZW		 259 if (GET_RTX_FORMAT(_code)[_n] != C1 \
260 && GET_RTX_FORMAT(_code)[_n] != C2) \
261 rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__, \
fbfc1192 262 __FUNCTION__); \
ef178af3
ZW		 263 &_rtx->fld[_n]; }))
264
8784fdcd 265#define RTL_CHECKC1(RTX, N, C) __extension__ \
83ab3839
RH		 266(*({ rtx _rtx = (RTX); int _n = (N); \
267 if (GET_CODE (_rtx) != C) \
fbfc1192 268 rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
83ab3839
RH		 269 &_rtx->fld[_n]; }))
270
8784fdcd 271#define RTL_CHECKC2(RTX, N, C1, C2) __extension__ \
83ab3839
RH		 272(*({ rtx _rtx = (RTX); int _n = (N); \
273 enum rtx_code _code = GET_CODE (_rtx); \
274 if (_code != C1 && _code != C2) \
fbfc1192 275 rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
83ab3839
RH		 276 &_rtx->fld[_n]; }))
277
8784fdcd 278#define RTVEC_ELT(RTVEC, I) __extension__ \
83ab3839 279(*({ rtvec _rtvec = (RTVEC); int _i = (I); \
ef178af3
ZW		 280 if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec)) \
281 rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__, \
fbfc1192 282 __FUNCTION__); \
ef178af3
ZW		 283 &_rtvec->elem[_i]; }))
284
cdadb1dd 285extern void rtl_check_failed_bounds PARAMS ((rtx, int,
ef178af3
ZW		 286 const char *, int, const char *))
287 ATTRIBUTE_NORETURN;
cdadb1dd 288extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
ef178af3
ZW		 289 const char *, int, const char *))
290 ATTRIBUTE_NORETURN;
cdadb1dd 291extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
ef178af3
ZW		 292 const char *, int, const char *))
293 ATTRIBUTE_NORETURN;
cdadb1dd 294extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
83ab3839
RH		 295 const char *, int, const char *))
296 ATTRIBUTE_NORETURN;
cdadb1dd 297extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
83ab3839
RH		 298 const char *, int, const char *))
299 ATTRIBUTE_NORETURN;
cdadb1dd 300extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
ef178af3
ZW		 301 const char *, int, const char *))
302 ATTRIBUTE_NORETURN;
303
f4524c9e 304#else /* not ENABLE_RTL_CHECKING */
ef178af3 305
83ab3839
RH		 306#define RTL_CHECK1(RTX, N, C1) ((RTX)->fld[N])
307#define RTL_CHECK2(RTX, N, C1, C2) ((RTX)->fld[N])
308#define RTL_CHECKC1(RTX, N, C) ((RTX)->fld[N])
818a3b15 309#define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
83ab3839 310#define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[I])
ef178af3
ZW		 311
312#endif
313
314#define XWINT(RTX, N) (RTL_CHECK1(RTX, N, 'w').rtwint)
315#define XINT(RTX, N) (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
316#define XSTR(RTX, N) (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
317#define XEXP(RTX, N) (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
318#define XVEC(RTX, N) (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
319#define XMODE(RTX, N) (RTL_CHECK1(RTX, N, 'M').rttype)
320#define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
321#define XTREE(RTX, N) (RTL_CHECK1(RTX, N, 't').rttree)
322#define XBBDEF(RTX, N) (RTL_CHECK1(RTX, N, 'B').bb)
323
324#define XVECEXP(RTX, N, M) RTVEC_ELT (XVEC (RTX, N), M)
325#define XVECLEN(RTX, N) GET_NUM_ELEM (XVEC (RTX, N))
326
327/* These are like XWINT, etc. except that they expect a '0' field instead
328 of the normal type code. */
329
330#define X0WINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtwint)
331#define X0INT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtint)
08394eef 332#define X0UINT(RTX, N) (RTL_CHECK1(RTX, N, '0').rtuint)
ef178af3
ZW		 333#define X0STR(RTX, N) (RTL_CHECK1(RTX, N, '0').rtstr)
334#define X0EXP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtx)
335#define X0VEC(RTX, N) (RTL_CHECK1(RTX, N, '0').rtvec)
336#define X0MODE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttype)
337#define X0BITMAP(RTX, N) (RTL_CHECK1(RTX, N, '0').rtbit)
338#define X0TREE(RTX, N) (RTL_CHECK1(RTX, N, '0').rttree)
339#define X0BBDEF(RTX, N) (RTL_CHECK1(RTX, N, '0').bb)
340#define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
eab5c70a 341#define X0CSELIB(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_cselib)
0dfa1860 342
83ab3839
RH		 343#define XCWINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtwint)
344#define XCINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtint)
770ae6cc 345#define XCUINT(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtuint)
83ab3839
RH		 346#define XCSTR(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtstr)
347#define XCEXP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtx)
348#define XCVEC(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtvec)
349#define XCMODE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttype)
350#define XCBITMAP(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rtbit)
351#define XCTREE(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rttree)
352#define XCBBDEF(RTX, N, C) (RTL_CHECKC1(RTX, N, C).bb)
353#define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
eab5c70a 354#define XCCSELIB(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_cselib)
83ab3839
RH		 355
356#define XCVECEXP(RTX, N, M, C) RTVEC_ELT (XCVEC (RTX, N, C), M)
357#define XCVECLEN(RTX, N, C) GET_NUM_ELEM (XCVEC (RTX, N, C))
358
359#define XC2EXP(RTX, N, C1, C2) (RTL_CHECKC2(RTX, N, C1, C2).rtx)
6f29feb1
JW		 360\f
361/* ACCESS MACROS for particular fields of insns. */
362
4e872036
AS		 363/* Determines whether X is an insn. */
364#define INSN_P(X) (GET_RTX_CLASS (GET_CODE(X)) == 'i')
365
6f29feb1
JW		 366/* Holds a unique number for each insn.
367 These are not necessarily sequentially increasing. */
8f985ec4 368#define INSN_UID(INSN) XINT(INSN, 0)
6f29feb1
JW		 369
370/* Chain insns together in sequence. */
8f985ec4
ZW		 371#define PREV_INSN(INSN) XEXP(INSN, 1)
372#define NEXT_INSN(INSN) XEXP(INSN, 2)
6f29feb1
JW		 373
374/* The body of an insn. */
8f985ec4 375#define PATTERN(INSN) XEXP(INSN, 3)
6f29feb1
JW		 376
377/* Code number of instruction, from when it was recognized.
378 -1 means this instruction has not been recognized yet. */
8f985ec4 379#define INSN_CODE(INSN) XINT(INSN, 4)
6f29feb1
JW		 380
381/* Set up in flow.c; empty before then.
382 Holds a chain of INSN_LIST rtx's whose first operands point at
383 previous insns with direct data-flow connections to this one.
384 That means that those insns set variables whose next use is in this insn.
385 They are always in the same basic block as this insn. */
8f985ec4 386#define LOG_LINKS(INSN) XEXP(INSN, 5)
6f29feb1
JW		 387
388/* 1 if insn has been deleted. */
389#define INSN_DELETED_P(INSN) ((INSN)->volatil)
390
391/* 1 if insn is a call to a const function. */
392#define CONST_CALL_P(INSN) ((INSN)->unchanging)
393
0a1c58a2
JL		 394/* 1 if insn (assumed to be a CALL_INSN) is a sibling call. */
395#define SIBLING_CALL_P(INSN) ((INSN)->jump)
396
6f29feb1
JW		 397/* 1 if insn is a branch that should not unconditionally execute its
398 delay slots, i.e., it is an annulled branch. */
399#define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
400
b53978a3
JO		 401/* 1 if insn is a dead code. Valid only for dead-code elimination phase. */
402#define INSN_DEAD_CODE_P(INSN) ((INSN)->in_struct)
403
6f29feb1 404/* 1 if insn is in a delay slot and is from the target of the branch. If
6dc42e49 405 the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
6f29feb1
JW		 406 executed if the branch is taken. For annulled branches with this bit
407 clear, the insn should be executed only if the branch is not taken. */
408#define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
409
f590cca1
RH		 410#define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
411
412#define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
413
6f29feb1 414/* Holds a list of notes on what this insn does to various REGs.
f590cca1
RH		 415 It is a chain of EXPR_LIST rtx's, where the second operand is the
416 chain pointer and the first operand is the REG being described.
6f29feb1 417 The mode field of the EXPR_LIST contains not a real machine mode
f590cca1 418 but a value from enum reg_note. */
6f29feb1 419
8f985ec4 420#define REG_NOTES(INSN) XEXP(INSN, 6)
6f29feb1
JW		 421
422/* Don't forget to change reg_note_name in rtl.c. */
f590cca1
RH		 423enum reg_note
424{
425 /* The value in REG dies in this insn (i.e., it is not needed past
426 this insn). If REG is set in this insn, the REG_DEAD note may,
427 but need not, be omitted. */
428 REG_DEAD = 1,
429
430 /* The REG is autoincremented or autodecremented. */
431 REG_INC,
432
433 /* Describes the insn as a whole; it says that the insn sets a register
434 to a constant value or to be equivalent to a memory address. If the
435 register is spilled to the stack then the constant value should be
436 substituted for it. The contents of the REG_EQUIV is the constant
437 value or memory address, which may be different from the source of
438 the SET although it has the same value. A REG_EQUIV note may also
439 appear on an insn which copies a register parameter to a pseudo-register,
440 if there is a memory address which could be used to hold that
441 pseudo-register throughout the function. */
be1bb652 442 REG_EQUIV,
f590cca1
RH		 443
444 /* Like REG_EQUIV except that the destination is only momentarily equal
445 to the specified rtx. Therefore, it cannot be used for substitution;
446 but it can be used for cse. */
447 REG_EQUAL,
448
449 /* The register set in this insn held 0 before the insn. The contents of
450 the note is the insn that stored the 0. If that insn is deleted or
451 patched to a NOTE, the REG_WAS_0 is inoperative. The REG_WAS_0 note
452 is actually an INSN_LIST, not an EXPR_LIST. */
453 REG_WAS_0,
454
455 /* This insn copies the return-value of a library call out of the hard reg
456 for return values. This note is actually an INSN_LIST and it points to
457 the first insn involved in setting up arguments for the call. flow.c
458 uses this to delete the entire library call when its result is dead. */
459 REG_RETVAL,
460
461 /* The inverse of REG_RETVAL: it goes on the first insn of the library call
be1bb652
RH		 462 and points at the one that has the REG_RETVAL. This note is also an
463 INSN_LIST. */
f590cca1
RH		 464 REG_LIBCALL,
465
466 /* The register is always nonnegative during the containing loop. This is
467 used in branches so that decrement and branch instructions terminating
468 on zero can be matched. There must be an insn pattern in the md file
469 named `decrement_and_branch_until_zero' or else this will never be added
470 to any instructions. */
471 REG_NONNEG,
472
473 /* There is no conflict *after this insn* between the register in the note
474 and the destination of this insn. */
475 REG_NO_CONFLICT,
476
477 /* Identifies a register set in this insn and never used. */
478 REG_UNUSED,
479
480 /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
481 respectively. Normally, these are required to be consecutive insns, but
482 we permit putting a cc0-setting insn in the delay slot of a branch as
483 long as only one copy of the insn exists. In that case, these notes
484 point from one to the other to allow code generation to determine what
be1bb652
RH		 485 any require information and to properly update CC_STATUS. These notes
486 are INSN_LISTs. */
f590cca1
RH		 487 REG_CC_SETTER, REG_CC_USER,
488
489 /* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
be1bb652
RH		 490 CODE_LABEL contained in the REG_LABEL note is used by the insn.
491 This note is an INSN_LIST. */
f590cca1
RH		 492 REG_LABEL,
493
494 /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
495 write-after-read and write-after-write dependencies respectively.
496 Data dependencies, which are the only type of LOG_LINK created by
497 flow, are represented by a 0 reg note kind. */
498 REG_DEP_ANTI, REG_DEP_OUTPUT,
499
500 /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
501 -fbranch-probabilities is given. It has an integer value. For jumps,
502 it is the probability that this is a taken branch. For calls, it is
503 the probability that this call won't return. */
504 REG_BR_PROB,
505
506 /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
507 the first insn after each CALL_INSN. It indicates how many times this
508 block was executed. */
509 REG_EXEC_COUNT,
510
511 /* Attached to a call insn; indicates that the call is malloc-like and
512 that the pointer returned cannot alias anything else. */
513 REG_NOALIAS,
514
515 /* Used to optimize rtl generated by dynamic stack allocations for targets
516 where SETJMP_VIA_SAVE_AREA is true. */
517 REG_SAVE_AREA,
518
519 /* Attached to JUMP_INSNs only, it holds the branch prediction flags
520 computed by get_jump_flags() after dbr scheduling is complete. */
521 REG_BR_PRED,
522
523 /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
524 for DWARF to interpret what they imply. The attached rtx is used
525 instead of intuition. */
526 REG_FRAME_RELATED_EXPR,
527
528 /* Indicates that REG holds the exception context for the function.
529 This context is shared by inline functions, so the code to acquire
530 the real exception context is delayed until after inlining. */
531 REG_EH_CONTEXT,
532
533 /* Indicates what exception region an INSN belongs in. This is used to
534 indicate what region to which a call may throw. REGION 0 indicates
535 that a call cannot throw at all. REGION -1 indicates that it cannot
536 throw, nor will it execute a non-local goto. */
537 REG_EH_REGION,
538
539 /* Indicates that a call is actually a call to rethrow, and specifies the
540 rethrow symbol for the region the rethrow is targetting. This provides
541 a way to generate the non standard flow edges required for a rethrow. */
542 REG_EH_RETHROW,
543
544 /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
8cd8f856
GK		 545 REG_SAVE_NOTE,
546
547 /* Indicates that this insn (which is part of the prologue) computes
548 a value which might not be used later, and if so it's OK to delete
549 the insn. Normally, deleting any insn in the prologue is an error.
550 At present the parameter is unused and set to (const_int 0). */
ca3920ad
JW		 551 REG_MAYBE_DEAD,
552
553 /* Indicates that a call does not return. */
4b01bd16
RH		 554 REG_NORETURN,
555
556 /* Indicates that an indirect jump is a non-local goto instead of a
557 computed goto. */
558 REG_NON_LOCAL_GOTO
f590cca1
RH		 559};
560
7ae21caf
DE		 561/* The base value for branch probability notes. */
562#define REG_BR_PROB_BASE 10000
6f29feb1
JW		 563
564/* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
565#define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
566#define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
567
568/* Names for REG_NOTE's in EXPR_LIST insn's. */
569
1f9a015e 570extern const char * const reg_note_name[];
0f41302f 571#define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
6f29feb1 572
e51c6661
RK		 573/* This field is only present on CALL_INSNs. It holds a chain of EXPR_LIST of
574 USE and CLOBBER expressions.
575 USE expressions list the registers filled with arguments that
576 are passed to the function.
577 CLOBBER expressions document the registers explicitly clobbered
578 by this CALL_INSN.
579 Pseudo registers can not be mentioned in this list. */
8f985ec4 580#define CALL_INSN_FUNCTION_USAGE(INSN) XEXP(INSN, 7)
e51c6661 581
6f29feb1
JW		 582/* The label-number of a code-label. The assembler label
583 is made from `L' and the label-number printed in decimal.
584 Label numbers are unique in a compilation. */
be1bb652 585#define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
6f29feb1
JW		 586
587#define LINE_NUMBER NOTE
588
0dfa1860
MM		 589/* In a NOTE that is a line number, this is a string for the file name that the
590 line is in. We use the same field to record block numbers temporarily in
591 NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes. (We avoid lots of casts
592 between ints and pointers if we use a different macro for the block number.)
593 The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
594 information as a rtx in the field. */
6f29feb1 595
83ab3839 596#define NOTE_SOURCE_FILE(INSN) XCSTR(INSN, 3, NOTE)
1a4450c7 597#define NOTE_BLOCK(INSN) XCTREE(INSN, 3, NOTE)
83ab3839
RH		 598#define NOTE_EH_HANDLER(INSN) XCINT(INSN, 3, NOTE)
599#define NOTE_RANGE_INFO(INSN) XCEXP(INSN, 3, NOTE)
600#define NOTE_LIVE_INFO(INSN) XCEXP(INSN, 3, NOTE)
601#define NOTE_BASIC_BLOCK(INSN) XCBBDEF(INSN, 3, NOTE)
994a57cd 602#define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
0dfa1860 603
6f29feb1
JW		 604/* In a NOTE that is a line number, this is the line number.
605 Other kinds of NOTEs are identified by negative numbers here. */
83ab3839 606#define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
6f29feb1 607
589ca5cb
MM		 608/* Nonzero if INSN is a note marking the beginning of a basic block. */
609#define NOTE_INSN_BASIC_BLOCK_P(INSN) \
610 (GET_CODE (INSN) == NOTE \
611 && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
612
6f29feb1 613/* Codes that appear in the NOTE_LINE_NUMBER field
a31efb86 614 for kinds of notes that are not line numbers.
6f29feb1 615
a31efb86
DE		 616 Notice that we do not try to use zero here for any of
617 the special note codes because sometimes the source line
618 actually can be zero! This happens (for example) when we
619 are generating code for the per-translation-unit constructor
620 and destructor routines for some C++ translation unit.
621
622 If you should change any of the following values, or if you
623 should add a new value here, don't forget to change the
624 note_insn_name array in rtl.c. */
6f29feb1 625
d636c18c
RH		 626enum insn_note
627{
628 /* Keep all of these numbers negative. Adjust as needed. */
629 NOTE_INSN_BIAS = -100,
630
631 /* This note is used to get rid of an insn
632 when it isn't safe to patch the insn out of the chain. */
633 NOTE_INSN_DELETED,
634
635 /* These are used to mark the beginning and end of a lexical block.
636 See NOTE_BLOCK, identify_blocks and reorder_blocks. */
637 NOTE_INSN_BLOCK_BEG,
638 NOTE_INSN_BLOCK_END,
639
640 /* These mark the extremes of a loop. */
641 NOTE_INSN_LOOP_BEG,
642 NOTE_INSN_LOOP_END,
643
644 /* Generated at the place in a loop that `continue' jumps to. */
645 NOTE_INSN_LOOP_CONT,
646 /* Generated at the start of a duplicated exit test. */
647 NOTE_INSN_LOOP_VTOP,
648
649 /* This kind of note is generated at the end of the function body,
650 just before the return insn or return label. In an optimizing
651 compilation it is deleted by the first jump optimization, after
652 enabling that optimizer to determine whether control can fall
653 off the end of the function body without a return statement. */
654 NOTE_INSN_FUNCTION_END,
655
656 /* This kind of note is generated just after each call to `setjmp',
657 and similar functions that can return twice. */
658 NOTE_INSN_SETJMP,
659
660 /* This marks the point immediately after the last prologue insn. */
661 NOTE_INSN_PROLOGUE_END,
662
663 /* This marks the point immediately prior to the first epilogue insn. */
664 NOTE_INSN_EPILOGUE_BEG,
665
666 /* Generated in place of user-declared labels when they are deleted. */
667 NOTE_INSN_DELETED_LABEL,
668
669 /* This note indicates the start of the real body of the function,
670 i.e. the point just after all of the parms have been moved into
671 their homes, etc. */
672 NOTE_INSN_FUNCTION_BEG,
673
674 /* These note where exception handling regions begin and end.
675 Uses NOTE_EH_HANDLER to identify the region in question. */
676 NOTE_INSN_EH_REGION_BEG,
677 NOTE_INSN_EH_REGION_END,
678
679 /* Generated whenever a duplicate line number note is output. For example,
680 one is output after the end of an inline function, in order to prevent
681 the line containing the inline call from being counted twice in gcov. */
b3b42a4d 682 NOTE_INSN_REPEATED_LINE_NUMBER,
d636c18c
RH		 683
684 /* Start/end of a live range region, where pseudos allocated on the stack
685 can be allocated to temporary registers. Uses NOTE_RANGE_INFO. */
b3b42a4d 686 NOTE_INSN_RANGE_BEG,
d636c18c
RH		 687 NOTE_INSN_RANGE_END,
688
689 /* Record which registers are currently live. Uses NOTE_LIVE_INFO. */
690 NOTE_INSN_LIVE,
691
692 /* Record the struct for the following basic block. Uses NOTE_BASIC_BLOCK. */
693 NOTE_INSN_BASIC_BLOCK,
694
994a57cd
RH		 695 /* Record the expected value of a register at a location. Uses
696 NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */
697 NOTE_INSN_EXPECTED_VALUE,
698
d636c18c
RH		 699 NOTE_INSN_MAX
700};
10f07067 701
6f29feb1
JW		 702/* Names for NOTE insn's other than line numbers. */
703
d636c18c
RH		 704extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
705#define GET_NOTE_INSN_NAME(NOTE_CODE) \
dbbbbf3b 706 (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
6f29feb1
JW		 707
708/* The name of a label, in case it corresponds to an explicit label
709 in the input source code. */
be1bb652 710#define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
6f29feb1
JW		 711
712/* In jump.c, each label contains a count of the number
713 of LABEL_REFs that point at it, so unused labels can be deleted. */
be1bb652 714#define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
6f29feb1 715
8cd0faaf
CM		 716/* Associate a name with a CODE_LABEL. */
717#define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
718
e9a25f70 719/* The original regno this ADDRESSOF was built for. */
770ae6cc 720#define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
e9a25f70
JL		 721
722/* The variable in the register we took the address of. */
83ab3839 723#define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
e9a25f70 724
6f29feb1
JW		 725/* In jump.c, each JUMP_INSN can point to a label that it can jump to,
726 so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
727 be decremented and possibly the label can be deleted. */
83ab3839 728#define JUMP_LABEL(INSN) XCEXP(INSN, 7, JUMP_INSN)
6f29feb1
JW		 729
730/* Once basic blocks are found in flow.c,
731 each CODE_LABEL starts a chain that goes through
732 all the LABEL_REFs that jump to that label.
be1bb652
RH		 733 The chain eventually winds up at the CODE_LABEL: it is circular. */
734#define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
6f29feb1
JW		 735\f
736/* This is the field in the LABEL_REF through which the circular chain
737 of references to a particular label is linked.
738 This chain is set up in flow.c. */
739
83ab3839 740#define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
6f29feb1
JW		 741
742/* Once basic blocks are found in flow.c,
743 Each LABEL_REF points to its containing instruction with this field. */
744
83ab3839 745#define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
6f29feb1 746
08394eef
BS		 747/* For a REG rtx, REGNO extracts the register number. ORIGINAL_REGNO holds
748 the number the register originally had; for a pseudo register turned into
749 a hard reg this will hold the old pseudo register number. */
6f29feb1 750
770ae6cc 751#define REGNO(RTX) XCUINT(RTX, 0, REG)
08394eef 752#define ORIGINAL_REGNO(RTX) X0UINT(RTX, 1)
6f29feb1
JW		 753
754/* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
755 is the current function's return value. */
756
757#define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
758
759/* 1 in a REG rtx if it corresponds to a variable declared by the user. */
760#define REG_USERVAR_P(RTX) ((RTX)->volatil)
761
3502dc9c
JDA		 762/* 1 in a REG rtx if the register is a pointer. */
763#define REG_POINTER(RTX) ((RTX)->frame_related)
764
cdbca172
JO		 765/* 1 if the given register REG corresponds to a hard register. */
766#define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
767
768/* 1 if the given register number REG_NO corresponds to a hard register. */
769#define HARD_REGISTER_NUM_P(REG_NO) (REG_NO < FIRST_PSEUDO_REGISTER)
770
6f29feb1
JW		 771/* For a CONST_INT rtx, INTVAL extracts the integer. */
772
83ab3839 773#define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
6f29feb1 774
a36556a8
ZW		 775/* For a CONST_DOUBLE:
776 The usual two ints that hold the value.
777 For a DImode, that is all there are;
778 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
779 For a float, the number of ints varies,
780 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
781 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
782#define CONST_DOUBLE_LOW(r) XCWINT (r, 2, CONST_DOUBLE)
783#define CONST_DOUBLE_HIGH(r) XCWINT (r, 3, CONST_DOUBLE)
784
785/* Link for chain of all CONST_DOUBLEs in use in current function. */
786#define CONST_DOUBLE_CHAIN(r) XCEXP (r, 1, CONST_DOUBLE)
787/* The MEM which represents this CONST_DOUBLE's value in memory,
788 or const0_rtx if no MEM has been made for it yet,
789 or cc0_rtx if it is not on the chain. */
790#define CONST_DOUBLE_MEM(r) XCEXP (r, 0, CONST_DOUBLE)
791
6f29feb1 792/* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
ddef6bc7 793 SUBREG_BYTE extracts the byte-number. */
6f29feb1 794
83ab3839 795#define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
ddef6bc7
JJ		 796#define SUBREG_BYTE(RTX) XCUINT(RTX, 1, SUBREG)
797
798/* in rtlanal.c */
799extern unsigned int subreg_regno_offset PARAMS ((unsigned int,
800 enum machine_mode,
801 unsigned int,
802 enum machine_mode));
803extern unsigned int subreg_regno PARAMS ((rtx));
6f29feb1 804
07be3989
RK		 805/* 1 if the REG contained in SUBREG_REG is already known to be
806 sign- or zero-extended from the mode of the SUBREG to the mode of
807 the reg. SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
f590cca1 808 extension.
07be3989
RK		 809
810 When used as a LHS, is means that this extension must be done
811 when assigning to SUBREG_REG. */
812
813#define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
814#define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
815
6f29feb1
JW		 816/* Access various components of an ASM_OPERANDS rtx. */
817
83ab3839
RH		 818#define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
819#define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
820#define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
821#define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
822#define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
823#define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
824#define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
6462bb43
AO		 825#define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
826 XCVECEXP ((RTX), 4, (N), ASM_OPERANDS)
3bdf5ad1
RK		 827#define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
828 XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
829#define ASM_OPERANDS_INPUT_MODE(RTX, N) \
830 GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
83ab3839
RH		 831#define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
832#define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
6f29feb1
JW		 833
834/* For a MEM rtx, 1 if it's a volatile reference.
835 Also in an ASM_OPERANDS rtx. */
836#define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
837
3bdf5ad1
RK		 838/* For a MEM rtx, 1 if it refers to an aggregate, either to the
839 aggregate itself of to a field of the aggregate. If zero, RTX may
4eb00163 840 or may not be such a reference. */
6f29feb1
JW		 841#define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
842
c6df88cb
MM		 843/* For a MEM rtx, 1 if it refers to a scalar. If zero, RTX may or may
844 not refer to a scalar.*/
845#define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
846
c6df88cb
MM		 847/* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
848 RTX. Otherwise, vice versa. Use this macro only when you are
849 *sure* that you know that the MEM is in a structure, or is a
850 scalar. VAL is evaluated only once. */
f9e158c3
JM		 851#define MEM_SET_IN_STRUCT_P(RTX, VAL) do { \
852 if (VAL) \
853 { \
854 MEM_IN_STRUCT_P (RTX) = 1; \
855 MEM_SCALAR_P (RTX) = 0; \
856 } \
857 else \
858 { \
859 MEM_IN_STRUCT_P (RTX) = 0; \
860 MEM_SCALAR_P (RTX) = 1; \
861 } \
862} while (0)
c6df88cb 863
41472af8
MM		 864/* For a MEM rtx, the alias set. If 0, this MEM is not in any alias
865 set, and may alias anything. Otherwise, the MEM can only alias
866 MEMs in the same alias set. This value is set in a
867 language-dependent manner in the front-end, and should not be
868 altered in the back-end. These set numbers are tested for zero,
869 and compared for equality; they have no other significance. In
870 some front-ends, these numbers may correspond in some way to types,
871 or other language-level entities, but they need not, and the
872 back-end makes no such assumptions. */
3bdf5ad1
RK		 873#define MEM_ALIAS_SET(RTX) XCWINT(RTX, 1, MEM)
874
875/* Copy the attributes that apply to memory locations from RHS to LHS. */
876#define MEM_COPY_ATTRIBUTES(LHS, RHS) \
877 (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS), \
878 MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS), \
879 MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS), \
880 MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS), \
881 RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
41472af8 882
6f29feb1
JW		 883/* For a LABEL_REF, 1 means that this reference is to a label outside the
884 loop containing the reference. */
885#define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
886
adfaf10a 887/* For a LABEL_REF, 1 means it is for a nonlocal label. */
2a406d2a 888/* Likewise in an EXPR_LIST for a REG_LABEL note. */
adfaf10a
RS		 889#define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
890
6f29feb1
JW		 891/* For a CODE_LABEL, 1 means always consider this label to be needed. */
892#define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
893
894/* For a REG, 1 means the register is used only in an exit test of a loop. */
895#define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
896
897/* During sched, for an insn, 1 means that the insn must be scheduled together
d45cf215 898 with the preceding insn. */
6f29feb1
JW		 899#define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
900
c376c05b
TW		 901/* During sched, for the LOG_LINKS of an insn, these cache the adjusted
902 cost of the dependence link. The cost of executing an instruction
903 may vary based on how the results are used. LINK_COST_ZERO is 1 when
904 the cost through the link varies and is unchanged (i.e., the link has
905 zero additional cost). LINK_COST_FREE is 1 when the cost through the
906 link is zero (i.e., the link makes the cost free). In other cases,
907 the adjustment to the cost is recomputed each time it is needed. */
908#define LINK_COST_ZERO(X) ((X)->jump)
909#define LINK_COST_FREE(X) ((X)->call)
910
6f29feb1
JW		 911/* For a SET rtx, SET_DEST is the place that is set
912 and SET_SRC is the value it is set to. */
83ab3839
RH		 913#define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
914#define SET_SRC(RTX) XCEXP(RTX, 1, SET)
6f29feb1
JW		 915
916/* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
83ab3839
RH		 917#define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
918#define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
6f29feb1 919
0c99ec5c
RH		 920/* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
921 conditionally executing the code on, COND_EXEC_CODE is the code
922 to execute if the condition is true. */
923#define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
924#define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
925
6f29feb1
JW		 926/* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
927#define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
928
bd7cf17e
JJ		 929/* 1 in a SYMBOL_REF if it addresses this function's string constant pool. */
930#define STRING_POOL_ADDRESS_P(RTX) ((RTX)->frame_related)
931
6f29feb1
JW		 932/* Flag in a SYMBOL_REF for machine-specific purposes. */
933#define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
934
935/* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
936#define SYMBOL_REF_USED(RTX) ((RTX)->used)
937
ff0b6b99
FS		 938/* 1 means a SYMBOL_REF is weak. */
939#define SYMBOL_REF_WEAK(RTX) ((RTX)->integrated)
940
6f29feb1
JW		 941/* Define a macro to look for REG_INC notes,
942 but save time on machines where they never exist. */
943
58e54c44
RS		 944/* Don't continue this line--convex cc version 4.1 would lose. */
945#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
6f29feb1
JW		 946#define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
947#else
948#define FIND_REG_INC_NOTE(insn, reg) 0
949#endif
950
951/* Indicate whether the machine has any sort of auto increment addressing.
952 If not, we can avoid checking for REG_INC notes. */
953
58e54c44
RS		 954/* Don't continue this line--convex cc version 4.1 would lose. */
955#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
6f29feb1
JW		 956#define AUTO_INC_DEC
957#endif
0dfa1860 958
940da324
JL		 959#ifndef HAVE_PRE_INCREMENT
960#define HAVE_PRE_INCREMENT 0
961#endif
962
963#ifndef HAVE_PRE_DECREMENT
964#define HAVE_PRE_DECREMENT 0
965#endif
966
967#ifndef HAVE_POST_INCREMENT
968#define HAVE_POST_INCREMENT 0
969#endif
970
971#ifndef HAVE_POST_DECREMENT
972#define HAVE_POST_DECREMENT 0
973#endif
974
4b983fdc
RH		 975#ifndef HAVE_POST_MODIFY_DISP
976#define HAVE_POST_MODIFY_DISP 0
977#endif
978
979#ifndef HAVE_POST_MODIFY_REG
980#define HAVE_POST_MODIFY_REG 0
981#endif
982
983#ifndef HAVE_PRE_MODIFY_DISP
984#define HAVE_PRE_MODIFY_DISP 0
985#endif
986
987#ifndef HAVE_PRE_MODIFY_REG
988#define HAVE_PRE_MODIFY_REG 0
989#endif
990
6e01bd94
MH		 991
992/* Some architectures do not have complete pre/post increment/decrement
993 instruction sets, or only move some modes efficiently. These macros
994 allow us to tune autoincrement generation. */
995
996#ifndef USE_LOAD_POST_INCREMENT
997#define USE_LOAD_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
998#endif
999
1000#ifndef USE_LOAD_POST_DECREMENT
1001#define USE_LOAD_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1002#endif
1003
1004#ifndef USE_LOAD_PRE_INCREMENT
1005#define USE_LOAD_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1006#endif
1007
1008#ifndef USE_LOAD_PRE_DECREMENT
1009#define USE_LOAD_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1010#endif
1011
1012#ifndef USE_STORE_POST_INCREMENT
1013#define USE_STORE_POST_INCREMENT(MODE) HAVE_POST_INCREMENT
1014#endif
1015
1016#ifndef USE_STORE_POST_DECREMENT
1017#define USE_STORE_POST_DECREMENT(MODE) HAVE_POST_DECREMENT
1018#endif
1019
1020#ifndef USE_STORE_PRE_INCREMENT
1021#define USE_STORE_PRE_INCREMENT(MODE) HAVE_PRE_INCREMENT
1022#endif
1023
1024#ifndef USE_STORE_PRE_DECREMENT
1025#define USE_STORE_PRE_DECREMENT(MODE) HAVE_PRE_DECREMENT
1026#endif
1027
1028
0dfa1860
MM		 1029/* Accessors for RANGE_INFO. */
1030/* For RANGE_{START,END} notes return the RANGE_START note. */
83ab3839 1031#define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
0dfa1860
MM		 1032
1033/* For RANGE_{START,END} notes return the RANGE_START note. */
83ab3839 1034#define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
0dfa1860
MM		 1035
1036/* For RANGE_{START,END} notes, return the vector containing the registers used
1037 in the range. */
83ab3839
RH		 1038#define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1039#define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1040#define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
0dfa1860
MM		 1041
1042/* For RANGE_{START,END} notes, the number of calls within the range. */
83ab3839 1043#define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
0dfa1860
MM		 1044
1045/* For RANGE_{START,END} notes, the number of insns within the range. */
83ab3839 1046#define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
0dfa1860
MM		 1047
1048/* For RANGE_{START,END} notes, a unique # to identify this range. */
83ab3839 1049#define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
0dfa1860
MM		 1050
1051/* For RANGE_{START,END} notes, the basic block # the range starts with. */
83ab3839 1052#define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
0dfa1860
MM		 1053
1054/* For RANGE_{START,END} notes, the basic block # the range ends with. */
83ab3839 1055#define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
0dfa1860
MM		 1056
1057/* For RANGE_{START,END} notes, the loop depth the range is in. */
83ab3839 1058#define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
0dfa1860
MM		 1059
1060/* For RANGE_{START,END} notes, the bitmap of live registers at the start
1061 of the range. */
83ab3839 1062#define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
0dfa1860
MM		 1063
1064/* For RANGE_{START,END} notes, the bitmap of live registers at the end
1065 of the range. */
83ab3839 1066#define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
0dfa1860
MM		 1067
1068/* For RANGE_START notes, the marker # of the start of the range. */
83ab3839 1069#define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
0dfa1860
MM		 1070
1071/* For RANGE_START notes, the marker # of the end of the range. */
83ab3839 1072#define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
0dfa1860
MM		 1073
1074/* Original pseudo register # for a live range note. */
83ab3839 1075#define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
0dfa1860
MM		 1076
1077/* Pseudo register # original register is copied into or -1. */
83ab3839 1078#define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
0dfa1860
MM		 1079
1080/* How many times a register in a live range note was referenced. */
83ab3839 1081#define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
0dfa1860
MM		 1082
1083/* How many times a register in a live range note was set. */
83ab3839 1084#define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
0dfa1860
MM		 1085
1086/* How many times a register in a live range note died. */
83ab3839 1087#define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
0dfa1860
MM		 1088
1089/* Whether the original value is needed to be copied into the range register at
1090 the start of the range. */
83ab3839 1091#define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
0dfa1860
MM		 1092
1093/* # of insns the register copy is live over. */
83ab3839 1094#define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
0dfa1860
MM		 1095
1096/* # of calls the register copy is live over. */
83ab3839 1097#define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
0dfa1860
MM		 1098
1099/* DECL_NODE pointer of the declaration if the register is a user defined
1100 variable. */
83ab3839 1101#define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
0dfa1860
MM		 1102
1103/* BLOCK_NODE pointer to the block the variable is declared in if the
1104 register is a user defined variable. */
83ab3839 1105#define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
0dfa1860
MM		 1106
1107/* EXPR_LIST of the distinct ranges a variable is in. */
1108#define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1109
1110/* Block a variable is declared in. */
1111#define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1112
1113/* # of distinct ranges a variable is in. */
1114#define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1115
1116/* For a NOTE_INSN_LIVE note, the registers which are currently live. */
1117#define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1118
1119/* For a NOTE_INSN_LIVE note, the original basic block number. */
1120#define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
4e872036
AS		 1121
1122/* Determine if the insn is a PHI node. */
1123#define PHI_NODE_P(X) \
1124 (X && GET_CODE (X) == INSN \
1125 && GET_CODE (PATTERN (X)) == SET \
1126 && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
6f29feb1 1127\f
bf6bb899
BS		 1128/* Nonzero if we need to distinguish between the return value of this function
1129 and the return value of a function called by this function. This helps
1130 integrate.c.
1131 This is 1 until after the rtl generation pass. */
1132extern int rtx_equal_function_value_matters;
1133
1b3d8f8a
GK		 1134/* Nonzero when we are generating CONCATs. */
1135extern int generating_concat_p;
1136
6f29feb1
JW		 1137/* Generally useful functions. */
1138
ac957f13 1139/* In expmed.c */
cdadb1dd 1140extern int ceil_log2 PARAMS ((unsigned HOST_WIDE_INT));
5f4f0e22
CH		 1141
1142#define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1143
1144#define plus_constant_for_output(X,C) \
1145 plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
1146
50b2596f 1147/* In explow.c */
c6991660 1148extern void set_stack_check_libfunc PARAMS ((rtx));
cdadb1dd 1149extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
7e4ce834 1150 enum machine_mode));
cdadb1dd
KG		 1151extern rtx plus_constant_wide PARAMS ((rtx, HOST_WIDE_INT));
1152extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1153extern void optimize_save_area_alloca PARAMS ((rtx));
5f4f0e22 1154
4eb00163 1155/* In emit-rtl.c */
cdadb1dd 1156extern rtx gen_rtx PARAMS ((enum rtx_code,
bdea67fa 1157 enum machine_mode, ...));
cdadb1dd
KG		 1158extern rtvec gen_rtvec PARAMS ((int, ...));
1159
4eb00163 1160/* In other files */
cdadb1dd
KG		 1161extern rtx rtx_alloc PARAMS ((RTX_CODE));
1162extern rtvec rtvec_alloc PARAMS ((int));
1163extern rtx copy_insn_1 PARAMS ((rtx));
1164extern rtx copy_insn PARAMS ((rtx));
4eb00163
JO		 1165
1166/* In rtl.c */
cdadb1dd 1167extern rtx copy_rtx PARAMS ((rtx));
4eb00163
JO		 1168
1169/* In emit-rtl.c */
cdadb1dd 1170extern rtx copy_rtx_if_shared PARAMS ((rtx));
4eb00163
JO		 1171
1172/* In rtl.c */
cdadb1dd
KG		 1173extern rtx copy_most_rtx PARAMS ((rtx, rtx));
1174extern rtx shallow_copy_rtx PARAMS ((rtx));
1175extern int rtx_equal_p PARAMS ((rtx, rtx));
4eb00163
JO		 1176
1177/* In emit-rtl.c */
cdadb1dd
KG		 1178extern rtvec gen_rtvec_v PARAMS ((int, rtx *));
1179extern rtx gen_reg_rtx PARAMS ((enum machine_mode));
1180extern rtx gen_label_rtx PARAMS ((void));
ddef6bc7 1181extern int subreg_hard_regno PARAMS ((rtx, int));
cdadb1dd
KG		 1182extern rtx gen_lowpart_common PARAMS ((enum machine_mode, rtx));
1183extern rtx gen_lowpart PARAMS ((enum machine_mode, rtx));
4eb00163
JO		 1184
1185/* In cse.c */
cdadb1dd 1186extern rtx gen_lowpart_if_possible PARAMS ((enum machine_mode, rtx));
4eb00163
JO		 1187
1188/* In emit-rtl.c */
cdadb1dd
KG		 1189extern rtx gen_highpart PARAMS ((enum machine_mode, rtx));
1190extern rtx gen_realpart PARAMS ((enum machine_mode, rtx));
1191extern rtx gen_imagpart PARAMS ((enum machine_mode, rtx));
770ae6cc
RK		 1192extern rtx operand_subword PARAMS ((rtx, unsigned int, int,
1193 enum machine_mode));
ddef6bc7
JJ		 1194extern rtx constant_subword PARAMS ((rtx, int,
1195 enum machine_mode));
4eb00163
JO		 1196
1197/* In emit-rtl.c */
770ae6cc
RK		 1198extern rtx operand_subword_force PARAMS ((rtx, unsigned int,
1199 enum machine_mode));
cdadb1dd 1200extern int subreg_lowpart_p PARAMS ((rtx));
e0e08ac2
JH		 1201extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1202 enum machine_mode));
1203extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1204 enum machine_mode));
cdadb1dd
KG		 1205extern rtx make_safe_from PARAMS ((rtx, rtx));
1206extern rtx convert_memory_address PARAMS ((enum machine_mode, rtx));
cdadb1dd
KG		 1207extern rtx get_insns PARAMS ((void));
1208extern const char *get_insn_name PARAMS ((int));
1209extern rtx get_last_insn PARAMS ((void));
1210extern rtx get_last_insn_anywhere PARAMS ((void));
1211extern void start_sequence PARAMS ((void));
1212extern void push_to_sequence PARAMS ((rtx));
1213extern void end_sequence PARAMS ((void));
c14f7160
ML		 1214extern void push_to_full_sequence PARAMS ((rtx, rtx));
1215extern void end_full_sequence PARAMS ((rtx*, rtx*));
cdadb1dd 1216extern rtx gen_sequence PARAMS ((void));
4eb00163
JO		 1217
1218/* In varasm.c */
cdadb1dd
KG		 1219extern rtx immed_double_const PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1220extern rtx force_const_mem PARAMS ((enum machine_mode, rtx));
4eb00163 1221
4eb00163 1222/* In varasm.c */
cdadb1dd
KG		 1223extern rtx get_pool_constant PARAMS ((rtx));
1224extern enum machine_mode get_pool_mode PARAMS ((rtx));
1225extern rtx get_pool_constant_for_function PARAMS ((struct function *, rtx));
1226extern enum machine_mode get_pool_mode_for_function PARAMS ((struct function *, rtx));
1227extern int get_pool_offset PARAMS ((rtx));
1228extern rtx simplify_subtraction PARAMS ((rtx));
4eb00163
JO		 1229
1230/* In function.c */
cdadb1dd 1231extern rtx assign_stack_local PARAMS ((enum machine_mode,
e5e809f4 1232 HOST_WIDE_INT, int));
cdadb1dd 1233extern rtx assign_stack_temp PARAMS ((enum machine_mode,
e5e809f4 1234 HOST_WIDE_INT, int));
cdadb1dd 1235extern rtx assign_temp PARAMS ((union tree_node *,
e5e809f4 1236 int, int, int));
4eb00163 1237/* In emit-rtl.c */
cdadb1dd
KG		 1238extern rtx emit_insn_before PARAMS ((rtx, rtx));
1239extern rtx emit_jump_insn_before PARAMS ((rtx, rtx));
1240extern rtx emit_call_insn_before PARAMS ((rtx, rtx));
1241extern rtx emit_barrier_before PARAMS ((rtx));
1242extern rtx emit_label_before PARAMS ((rtx, rtx));
1243extern rtx emit_note_before PARAMS ((int, rtx));
1244extern rtx emit_insn_after PARAMS ((rtx, rtx));
1245extern rtx emit_jump_insn_after PARAMS ((rtx, rtx));
1246extern rtx emit_barrier_after PARAMS ((rtx));
1247extern rtx emit_label_after PARAMS ((rtx, rtx));
1248extern rtx emit_note_after PARAMS ((int, rtx));
3cce094d 1249extern rtx emit_line_note_after PARAMS ((const char *, int, rtx));
cdadb1dd
KG		 1250extern rtx emit_insn PARAMS ((rtx));
1251extern rtx emit_insns PARAMS ((rtx));
1252extern rtx emit_insns_before PARAMS ((rtx, rtx));
1253extern rtx emit_insns_after PARAMS ((rtx, rtx));
1254extern rtx emit_jump_insn PARAMS ((rtx));
1255extern rtx emit_call_insn PARAMS ((rtx));
1256extern rtx emit_label PARAMS ((rtx));
1257extern rtx emit_barrier PARAMS ((void));
3cce094d
KG		 1258extern rtx emit_line_note PARAMS ((const char *, int));
1259extern rtx emit_note PARAMS ((const char *, int));
1260extern rtx emit_line_note_force PARAMS ((const char *, int));
cdadb1dd
KG		 1261extern rtx make_insn_raw PARAMS ((rtx));
1262extern rtx previous_insn PARAMS ((rtx));
1263extern rtx next_insn PARAMS ((rtx));
1264extern rtx prev_nonnote_insn PARAMS ((rtx));
1265extern rtx next_nonnote_insn PARAMS ((rtx));
1266extern rtx prev_real_insn PARAMS ((rtx));
1267extern rtx next_real_insn PARAMS ((rtx));
1268extern rtx prev_active_insn PARAMS ((rtx));
1269extern rtx next_active_insn PARAMS ((rtx));
69732dcb 1270extern int active_insn_p PARAMS ((rtx));
cdadb1dd
KG		 1271extern rtx prev_label PARAMS ((rtx));
1272extern rtx next_label PARAMS ((rtx));
1273extern rtx next_cc0_user PARAMS ((rtx));
1274extern rtx prev_cc0_setter PARAMS ((rtx));
4eb00163
JO		 1275
1276/* In jump.c */
cdadb1dd
KG		 1277extern rtx next_nondeleted_insn PARAMS ((rtx));
1278extern enum rtx_code reverse_condition PARAMS ((enum rtx_code));
7913f3d0 1279extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
cdadb1dd
KG		 1280extern enum rtx_code swap_condition PARAMS ((enum rtx_code));
1281extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1282extern enum rtx_code signed_condition PARAMS ((enum rtx_code));
90a74703 1283extern void mark_jump_label PARAMS ((rtx, rtx, int, int));
4eb00163 1284
4eb00163 1285/* In jump.c */
cdadb1dd
KG		 1286extern rtx squeeze_notes PARAMS ((rtx, rtx));
1287extern rtx delete_insn PARAMS ((rtx));
1288extern void delete_jump PARAMS ((rtx));
1289extern void delete_barrier PARAMS ((rtx));
1290extern rtx get_label_before PARAMS ((rtx));
1291extern rtx get_label_after PARAMS ((rtx));
1292extern rtx follow_jumps PARAMS ((rtx));
4eb00163
JO		 1293
1294/* In recog.c */
cdadb1dd 1295extern rtx adj_offsettable_operand PARAMS ((rtx, int));
4eb00163
JO		 1296
1297/* In emit-rtl.c */
cdadb1dd 1298extern rtx try_split PARAMS ((rtx, rtx, int));
4eb00163
JO		 1299
1300/* In unknown file */
cdadb1dd 1301extern rtx split_insns PARAMS ((rtx, rtx));
4eb00163
JO		 1302
1303/* In simplify-rtx.c */
d9c695ff
RK		 1304extern rtx simplify_unary_operation PARAMS ((enum rtx_code,
1305 enum machine_mode, rtx,
1306 enum machine_mode));
1307extern rtx simplify_binary_operation PARAMS ((enum rtx_code,
1308 enum machine_mode, rtx,
1309 rtx));
1310extern rtx simplify_ternary_operation PARAMS ((enum rtx_code,
1311 enum machine_mode,
1312 enum machine_mode, rtx, rtx,
1313 rtx));
1314extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1315 enum machine_mode, rtx,
1316 rtx));
1317extern rtx simplify_gen_binary PARAMS ((enum rtx_code,
1318 enum machine_mode,
1319 rtx, rtx));
1320extern rtx simplify_gen_unary PARAMS ((enum rtx_code,
1321 enum machine_mode, rtx,
1322 enum machine_mode));
1323extern rtx simplify_gen_ternary PARAMS ((enum rtx_code,
1324 enum machine_mode,
1325 enum machine_mode,
1326 rtx, rtx, rtx));
1327extern rtx simplify_gen_relational PARAMS ((enum rtx_code,
141e454b 1328 enum machine_mode,
d9c695ff
RK		 1329 enum machine_mode,
1330 rtx, rtx));
eea50aa0
JH		 1331extern rtx simplify_subreg PARAMS ((enum machine_mode,
1332 rtx,
1333 enum machine_mode,
1334 unsigned int));
949c5d62
JH		 1335extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
1336 rtx,
1337 enum machine_mode,
1338 unsigned int));
d9c695ff 1339extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
cdadb1dd 1340extern rtx simplify_rtx PARAMS ((rtx));
4eb00163 1341
4eb00163 1342/* In function.c */
cdadb1dd 1343extern rtx gen_mem_addressof PARAMS ((rtx, union tree_node *));
4eb00163 1344
4eb00163 1345/* In regclass.c */
770ae6cc
RK		 1346extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1347 unsigned int));
4eb00163
JO		 1348
1349/* In emit-rtl.c */
cdadb1dd 1350extern void set_unique_reg_note PARAMS ((rtx, enum reg_note, rtx));
9ae8ffe7 1351
e9a25f70
JL		 1352/* Functions in rtlanal.c */
1353
b1cdafbb
JH		 1354/* Single set is implemented as macro for performance reasons. */
1355#define single_set(I) (INSN_P (I) \
1356 ? (GET_CODE (PATTERN (I)) == SET \
1357 ? PATTERN (I) : single_set_1 (I)) \
1358 : NULL_RTX)
2130b7fb 1359#define single_set_1(I) single_set_2 (I, PATTERN (I))
b1cdafbb 1360
e38fe8e0 1361extern int rtx_addr_can_trap_p PARAMS ((rtx));
cdadb1dd 1362extern int rtx_unstable_p PARAMS ((rtx));
e38fe8e0
BS		 1363extern int rtx_varies_p PARAMS ((rtx, int));
1364extern int rtx_addr_varies_p PARAMS ((rtx, int));
cdadb1dd
KG		 1365extern HOST_WIDE_INT get_integer_term PARAMS ((rtx));
1366extern rtx get_related_value PARAMS ((rtx));
1367extern int reg_mentioned_p PARAMS ((rtx, rtx));
4b983fdc 1368extern int count_occurrences PARAMS ((rtx, rtx, int));
cdadb1dd
KG		 1369extern int reg_referenced_p PARAMS ((rtx, rtx));
1370extern int reg_used_between_p PARAMS ((rtx, rtx, rtx));
1371extern int reg_referenced_between_p PARAMS ((rtx, rtx, rtx));
1372extern int reg_set_between_p PARAMS ((rtx, rtx, rtx));
1373extern int regs_set_between_p PARAMS ((rtx, rtx, rtx));
e5c56fd9 1374extern int swap_commutative_operands_p PARAMS ((rtx, rtx));
cdadb1dd
KG		 1375extern int modified_between_p PARAMS ((rtx, rtx, rtx));
1376extern int no_labels_between_p PARAMS ((rtx, rtx));
1377extern int no_jumps_between_p PARAMS ((rtx, rtx));
1378extern int modified_in_p PARAMS ((rtx, rtx));
4eb00163 1379extern int insn_dependent_p PARAMS ((rtx, rtx));
cdadb1dd 1380extern int reg_set_p PARAMS ((rtx, rtx));
2130b7fb 1381extern rtx single_set_2 PARAMS ((rtx, rtx));
cdadb1dd 1382extern int multiple_sets PARAMS ((rtx));
7142e318 1383extern int set_noop_p PARAMS ((rtx));
cdadb1dd 1384extern rtx find_last_value PARAMS ((rtx, rtx *, rtx, int));
770ae6cc
RK		 1385extern int refers_to_regno_p PARAMS ((unsigned int, unsigned int,
1386 rtx, rtx *));
cdadb1dd 1387extern int reg_overlap_mentioned_p PARAMS ((rtx, rtx));
91b2d119 1388extern rtx set_of PARAMS ((rtx, rtx));
770ae6cc
RK		 1389extern void note_stores PARAMS ((rtx,
1390 void (*) (rtx, rtx, void *),
1391 void *));
e2373f95
RK		 1392extern void note_uses PARAMS ((rtx *,
1393 void (*) (rtx *, void *),
1394 void *));
cdadb1dd
KG		 1395extern rtx reg_set_last PARAMS ((rtx, rtx));
1396extern int dead_or_set_p PARAMS ((rtx, rtx));
770ae6cc 1397extern int dead_or_set_regno_p PARAMS ((rtx, unsigned int));
cdadb1dd 1398extern rtx find_reg_note PARAMS ((rtx, enum reg_note, rtx));
770ae6cc
RK		 1399extern rtx find_regno_note PARAMS ((rtx, enum reg_note,
1400 unsigned int));
d9c695ff 1401extern rtx find_reg_equal_equiv_note PARAMS ((rtx));
cdadb1dd 1402extern int find_reg_fusage PARAMS ((rtx, enum rtx_code, rtx));
770ae6cc
RK		 1403extern int find_regno_fusage PARAMS ((rtx, enum rtx_code,
1404 unsigned int));
cdadb1dd
KG		 1405extern void remove_note PARAMS ((rtx, rtx));
1406extern int side_effects_p PARAMS ((rtx));
1407extern int volatile_refs_p PARAMS ((rtx));
1408extern int volatile_insn_p PARAMS ((rtx));
1409extern int may_trap_p PARAMS ((rtx));
1410extern int inequality_comparisons_p PARAMS ((rtx));
1411extern rtx replace_rtx PARAMS ((rtx, rtx, rtx));
770ae6cc
RK		 1412extern rtx replace_regs PARAMS ((rtx, rtx *, unsigned int,
1413 int));
cdadb1dd
KG		 1414extern int computed_jump_p PARAMS ((rtx));
1415typedef int (*rtx_function) PARAMS ((rtx *, void *));
1416extern int for_each_rtx PARAMS ((rtx *, rtx_function, void *));
770ae6cc 1417extern rtx regno_use_in PARAMS ((unsigned int, rtx));
cdadb1dd
KG		 1418extern int auto_inc_p PARAMS ((rtx));
1419extern void remove_node_from_expr_list PARAMS ((rtx, rtx *));
1420extern int insns_safe_to_move_p PARAMS ((rtx, rtx, rtx *));
db7ba742 1421extern int loc_mentioned_in_p PARAMS ((rtx *, rtx));
6f29feb1 1422
ae0b51ef
JL		 1423/* flow.c */
1424
cdadb1dd
KG		 1425extern rtx find_use_as_address PARAMS ((rtx, rtx, HOST_WIDE_INT));
1426void init_EXPR_INSN_LIST_cache PARAMS ((void));
1427void free_EXPR_LIST_list PARAMS ((rtx *));
1428void free_INSN_LIST_list PARAMS ((rtx *));
1429void free_EXPR_LIST_node PARAMS ((rtx));
1430void free_INSN_LIST_node PARAMS ((rtx));
1431rtx alloc_INSN_LIST PARAMS ((rtx, rtx));
1432rtx alloc_EXPR_LIST PARAMS ((int, rtx, rtx));
d9d4fb43 1433void clear_log_links PARAMS ((rtx));
ae0b51ef
JL		 1434
1435/* regclass.c */
1436
6f29feb1
JW		 1437/* Maximum number of parallel sets and clobbers in any insn in this fn.
1438 Always at least 3, since the combiner could put that many togetherm
1439 and we want this to remain correct for all the remaining passes. */
1440
1441extern int max_parallel;
1442
e0c6d139 1443/* Free up register info memory. */
cdadb1dd 1444extern void free_reg_info PARAMS ((void));
e0c6d139 1445
ae0b51ef 1446/* recog.c */
cdadb1dd 1447extern int asm_noperands PARAMS ((rtx));
3cce094d 1448extern const char *decode_asm_operands PARAMS ((rtx, rtx *, rtx **,
9b3142b3
KG		 1449 const char **,
1450 enum machine_mode *));
6f29feb1 1451
cdadb1dd
KG		 1452extern enum reg_class reg_preferred_class PARAMS ((int));
1453extern enum reg_class reg_alternate_class PARAMS ((int));
6f29feb1 1454
cdadb1dd 1455extern rtx get_first_nonparm_insn PARAMS ((void));
6f29feb1 1456
cdadb1dd 1457extern void split_all_insns PARAMS ((int));
6a73406e 1458
68d75312 1459#define MAX_SAVED_CONST_INT 64
5da077de 1460extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
68d75312 1461
5da077de
AS		 1462#define const0_rtx (const_int_rtx[MAX_SAVED_CONST_INT])
1463#define const1_rtx (const_int_rtx[MAX_SAVED_CONST_INT+1])
1464#define const2_rtx (const_int_rtx[MAX_SAVED_CONST_INT+2])
1465#define constm1_rtx (const_int_rtx[MAX_SAVED_CONST_INT-1])
6f29feb1 1466extern rtx const_true_rtx;
a8efe40d
RK		 1467
1468extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1469
f590cca1 1470/* Returns a constant 0 rtx in mode MODE. Integer modes are treated the
a8efe40d
RK		 1471 same as VOIDmode. */
1472
1473#define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1474
1475/* Likewise, for the constants 1 and 2. */
1476
1477#define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1478#define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
6f29feb1 1479
5da077de
AS		 1480/* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1481 is used to represent the frame pointer. This is because the
1482 hard frame pointer and the automatic variables are separated by an amount
1483 that cannot be determined until after register allocation. We can assume
1484 that in this case ELIMINABLE_REGS will be defined, one action of which
1485 will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1486#ifndef HARD_FRAME_POINTER_REGNUM
1487#define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1488#endif
1489
1490/* Index labels for global_rtl. */
1491enum global_rtl_index
68d75312 1492{
5da077de
AS		 1493 GR_PC,
1494 GR_CC0,
1495 GR_STACK_POINTER,
1496 GR_FRAME_POINTER,
1497/* For register elimination to work properly these hard_frame_pointer_rtx,
1498 frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1499 the same register. */
1500#if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1501 GR_ARG_POINTER = GR_FRAME_POINTER,
1502#endif
1503#if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1504 GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1505#else
1506 GR_HARD_FRAME_POINTER,
1507#endif
1508#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1509#if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1510 GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1511#else
1512 GR_ARG_POINTER,
1513#endif
1514#endif
1515 GR_VIRTUAL_INCOMING_ARGS,
1516 GR_VIRTUAL_STACK_ARGS,
1517 GR_VIRTUAL_STACK_DYNAMIC,
1518 GR_VIRTUAL_OUTGOING_ARGS,
1519 GR_VIRTUAL_CFA,
1520
1521 GR_MAX
1522};
1523
1524/* Pointers to standard pieces of rtx are stored here. */
1525extern rtx global_rtl[GR_MAX];
1526
1527/* Standard pieces of rtx, to be substituted directly into things. */
1528#define pc_rtx (global_rtl[GR_PC])
1529#define cc0_rtx (global_rtl[GR_CC0])
68d75312 1530
6f29feb1
JW		 1531/* All references to certain hard regs, except those created
1532 by allocating pseudo regs into them (when that's possible),
1533 go through these unique rtx objects. */
5da077de
AS		 1534#define stack_pointer_rtx (global_rtl[GR_STACK_POINTER])
1535#define frame_pointer_rtx (global_rtl[GR_FRAME_POINTER])
1536#define hard_frame_pointer_rtx (global_rtl[GR_HARD_FRAME_POINTER])
1537#define arg_pointer_rtx (global_rtl[GR_ARG_POINTER])
68d75312 1538
6f29feb1
JW		 1539extern rtx pic_offset_table_rtx;
1540extern rtx struct_value_rtx;
1541extern rtx struct_value_incoming_rtx;
1542extern rtx static_chain_rtx;
1543extern rtx static_chain_incoming_rtx;
07ebc930 1544extern rtx return_address_pointer_rtx;
3b80f6ca
RH		 1545
1546/* Include the RTL generation functions. */
1547
1548#ifndef NO_GENRTL_H
1549#include "genrtl.h"
1550#endif
1551
41472af8
MM		 1552/* There are some RTL codes that require special attention; the
1553 generation functions included above do the raw handling. If you
b4213325
MM		 1554 add to this list, modify special_rtx in gengenrtl.c as well. You
1555 should also modify gen_rtx to use the special function. */
3b80f6ca 1556
cdadb1dd 1557extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
0133b7d9 1558 HOST_WIDE_INT, HOST_WIDE_INT));
cdadb1dd 1559extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
08394eef 1560extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
cdadb1dd 1561extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
ddef6bc7 1562extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
cdadb1dd 1563extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
3b80f6ca 1564
ddef6bc7
JJ		 1565extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1566
aefdd5ab
JL		 1567/* We need the cast here to ensure that we get the same result both with
1568 and without prototypes. */
1569#define GEN_INT(N) gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
3b80f6ca 1570
6f29feb1
JW		 1571/* Virtual registers are used during RTL generation to refer to locations into
1572 the stack frame when the actual location isn't known until RTL generation
1573 is complete. The routine instantiate_virtual_regs replaces these with
1574 the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1575 a constant. */
1576
1577#define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
1578
1579/* This points to the first word of the incoming arguments passed on the stack,
1580 either by the caller or by the callee when pretending it was passed by the
1581 caller. */
1582
5da077de 1583#define virtual_incoming_args_rtx (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
6f29feb1
JW		 1584
1585#define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
1586
60343c3b 1587/* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
6f29feb1
JW		 1588 variable on the stack. Otherwise, it points to the first variable on
1589 the stack. */
1590
5da077de 1591#define virtual_stack_vars_rtx (global_rtl[GR_VIRTUAL_STACK_ARGS])
6f29feb1
JW		 1592
1593#define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
1594
1595/* This points to the location of dynamically-allocated memory on the stack
1596 immediately after the stack pointer has been adjusted by the amount
1597 desired. */
1598
5da077de 1599#define virtual_stack_dynamic_rtx (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
6f29feb1
JW		 1600
1601#define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
1602
1603/* This points to the location in the stack at which outgoing arguments should
1604 be written when the stack is pre-pushed (arguments pushed using push
1605 insns always use sp). */
1606
5da077de 1607#define virtual_outgoing_args_rtx (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
6f29feb1
JW		 1608
1609#define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
1610
71038426
RH		 1611/* This points to the Canonical Frame Address of the function. This
1612 should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1613 but is calculated relative to the arg pointer for simplicity; the
f590cca1 1614 frame pointer nor stack pointer are necessarily fixed relative to
71038426
RH		 1615 the CFA until after reload. */
1616
5da077de 1617#define virtual_cfa_rtx (global_rtl[GR_VIRTUAL_CFA])
71038426
RH		 1618
1619#define VIRTUAL_CFA_REGNUM ((FIRST_VIRTUAL_REGISTER) + 4)
1620
1621#define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 4)
6f29feb1 1622
848e0190
JH		 1623/* REGNUM never really appearing in the INSN stream. */
1624#define INVALID_REGNUM (~(unsigned int)0)
1625
cdadb1dd 1626extern rtx find_next_ref PARAMS ((rtx, rtx));
f837a861 1627
bd7cf17e 1628extern rtx output_constant_def PARAMS ((union tree_node *, int));
cdadb1dd 1629extern rtx immed_real_const PARAMS ((union tree_node *));
6f29feb1
JW		 1630
1631/* Define a default value for STORE_FLAG_VALUE. */
1632
1633#ifndef STORE_FLAG_VALUE
1634#define STORE_FLAG_VALUE 1
1635#endif
1636
0ea0e871
JL		 1637/* Nonzero after the second flow pass has completed.
1638 Set to 1 or 0 by toplev.c */
1639extern int flow2_completed;
1640
6f29feb1 1641/* Nonzero after end of reload pass.
0ea0e871 1642 Set to 1 or 0 by reload1.c. */
6f29feb1
JW		 1643
1644extern int reload_completed;
1645
1646/* Set to 1 while reload_as_needed is operating.
1647 Required by some machines to handle any generated moves differently. */
1648
1649extern int reload_in_progress;
1650
1651/* If this is nonzero, we do not bother generating VOLATILE
1652 around volatile memory references, and we are willing to
1653 output indirect addresses. If cse is to follow, we reject
1654 indirect addresses so a useful potential cse is generated;
1655 if it is used only once, instruction combination will produce
1656 the same indirect address eventually. */
1657extern int cse_not_expected;
1658
f1db3576
JL		 1659/* Set to nonzero before life analysis to indicate that it is unsafe to
1660 generate any new pseudo registers. */
1661extern int no_new_pseudos;
1662
f5118aa5 1663/* Translates rtx code to tree code, for those codes needed by
88efc60a
RK		 1664 REAL_ARITHMETIC. The function returns an int because the caller may not
1665 know what `enum tree_code' means. */
1666
cdadb1dd 1667extern int rtx_to_tree_code PARAMS ((enum rtx_code));
9ae8ffe7 1668
ac957f13 1669/* In tree.c */
ac957f13 1670struct obstack;
cdadb1dd 1671extern void gcc_obstack_init PARAMS ((struct obstack *));
1f8f4a0b 1672
ac957f13
JL		 1673/* In cse.c */
1674struct cse_basic_block_data;
f1c1dfc3
BS		 1675
1676/* Return the right cost to give to an operation
1677 to make the cost of the corresponding register-to-register instruction
1678 N times that of a fast register-to-register instruction. */
1679#define COSTS_N_INSNS(N) ((N) * 4)
1680
1681/* Maximum cost of a rtl expression. This value has the special meaning
1682 not to use an rtx with this cost under any circumstances. */
1683#define MAX_COST INT_MAX
1684
cdadb1dd 1685extern int rtx_cost PARAMS ((rtx, enum rtx_code));
01329426 1686extern int address_cost PARAMS ((rtx, enum machine_mode));
cdadb1dd 1687extern void delete_trivially_dead_insns PARAMS ((rtx, int));
ac957f13 1688#ifdef BUFSIZ
cdadb1dd 1689extern int cse_main PARAMS ((rtx, int, int, FILE *));
ac957f13 1690#endif
cdadb1dd 1691extern void cse_end_of_basic_block PARAMS ((rtx,
ac957f13
JL		 1692 struct cse_basic_block_data *,
1693 int, int, int));
1694
1695/* In jump.c */
cdadb1dd
KG		 1696extern int comparison_dominates_p PARAMS ((enum rtx_code, enum rtx_code));
1697extern int condjump_p PARAMS ((rtx));
e4c85816
JH		 1698extern int any_condjump_p PARAMS ((rtx));
1699extern int any_uncondjump_p PARAMS ((rtx));
1700extern int safe_to_remove_jump_p PARAMS ((rtx));
1701extern rtx pc_set PARAMS ((rtx));
cdadb1dd
KG		 1702extern rtx condjump_label PARAMS ((rtx));
1703extern int simplejump_p PARAMS ((rtx));
1704extern int returnjump_p PARAMS ((rtx));
1705extern int onlyjump_p PARAMS ((rtx));
1706extern int sets_cc0_p PARAMS ((rtx));
2ea64f10 1707extern int invert_jump_1 PARAMS ((rtx, rtx));
9ba11d5a 1708extern int invert_jump PARAMS ((rtx, rtx, int));
cdadb1dd
KG		 1709extern int rtx_renumbered_equal_p PARAMS ((rtx, rtx));
1710extern int true_regnum PARAMS ((rtx));
2ea64f10 1711extern int redirect_jump_1 PARAMS ((rtx, rtx));
9ba11d5a 1712extern int redirect_jump PARAMS ((rtx, rtx, int));
cdadb1dd 1713extern void jump_optimize PARAMS ((rtx, int, int, int));
0a1c58a2 1714extern void jump_optimize_minimal PARAMS ((rtx));
cdadb1dd
KG		 1715extern void rebuild_jump_labels PARAMS ((rtx));
1716extern void thread_jumps PARAMS ((rtx, int, int));
cdadb1dd 1717extern int rtx_equal_for_thread_p PARAMS ((rtx, rtx, rtx));
cdadb1dd 1718extern int can_reverse_comparison_p PARAMS ((rtx, rtx));
ab94bc48
JH		 1719extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1720extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1721 rtx, rtx, rtx));
cdadb1dd
KG		 1722extern void delete_for_peephole PARAMS ((rtx, rtx));
1723extern int condjump_in_parallel_p PARAMS ((rtx));
1724extern void never_reached_warning PARAMS ((rtx));
ac957f13 1725
14bf4a33 1726/* Flags for jump_optimize() */
a05924f9
JH		 1727#define JUMP_CROSS_JUMP 1
1728#define JUMP_CROSS_JUMP_DEATH_MATTERS 2
1729#define JUMP_NOOP_MOVES 1
1730#define JUMP_AFTER_REGSCAN 1
14bf4a33 1731
ac957f13 1732/* In emit-rtl.c. */
cdadb1dd
KG		 1733extern int max_reg_num PARAMS ((void));
1734extern int max_label_num PARAMS ((void));
1735extern int get_first_label_num PARAMS ((void));
1736extern void delete_insns_since PARAMS ((rtx));
1737extern void mark_reg_pointer PARAMS ((rtx, int));
1738extern void mark_user_reg PARAMS ((rtx));
1739extern void reset_used_flags PARAMS ((rtx));
1740extern void reorder_insns PARAMS ((rtx, rtx, rtx));
1741extern int get_max_uid PARAMS ((void));
1742extern int in_sequence_p PARAMS ((void));
1743extern void force_next_line_note PARAMS ((void));
1744extern void clear_emit_caches PARAMS ((void));
1745extern void init_emit PARAMS ((void));
1746extern void init_emit_once PARAMS ((int));
1747extern void push_topmost_sequence PARAMS ((void));
1748extern void pop_topmost_sequence PARAMS ((void));
1749extern int subreg_realpart_p PARAMS ((rtx));
1750extern void reverse_comparison PARAMS ((rtx));
1751extern void set_new_first_and_last_insn PARAMS ((rtx, rtx));
1752extern void set_new_first_and_last_label_num PARAMS ((int, int));
1753extern void set_new_last_label_num PARAMS ((int));
d1b81779 1754extern void unshare_all_rtl_again PARAMS ((rtx));
cdadb1dd
KG		 1755extern void set_last_insn PARAMS ((rtx));
1756extern void link_cc0_insns PARAMS ((rtx));
1757extern void add_insn PARAMS ((rtx));
1758extern void add_insn_before PARAMS ((rtx, rtx));
1759extern void add_insn_after PARAMS ((rtx, rtx));
1760extern void remove_insn PARAMS ((rtx));
1761extern void reorder_insns_with_line_notes PARAMS ((rtx, rtx, rtx));
1762extern void emit_insn_after_with_line_notes PARAMS ((rtx, rtx, rtx));
1763extern enum rtx_code classify_insn PARAMS ((rtx));
1764extern rtx emit PARAMS ((rtx));
a11759a3
JR		 1765/* Query and clear/ restore no_line_numbers. This is used by the
1766 switch / case handling in stmt.c to give proper line numbers in
1767 warnings about unreachable code. */
cdadb1dd
KG		 1768int force_line_numbers PARAMS ((void));
1769void restore_line_number_status PARAMS ((int old_value));
1770extern void renumber_insns PARAMS ((FILE *));
f8855270 1771extern void remove_unnecessary_notes PARAMS ((void));
ac957f13 1772
ac957f13 1773/* In combine.c */
770ae6cc
RK		 1774extern int combine_instructions PARAMS ((rtx, unsigned int));
1775extern unsigned int extended_count PARAMS ((rtx, enum machine_mode, int));
1776extern rtx remove_death PARAMS ((unsigned int, rtx));
ac957f13 1777#ifdef BUFSIZ
cdadb1dd
KG		 1778extern void dump_combine_stats PARAMS ((FILE *));
1779extern void dump_combine_total_stats PARAMS ((FILE *));
ac957f13
JL		 1780#endif
1781
1782/* In sched.c. */
1783#ifdef BUFSIZ
cdadb1dd 1784extern void schedule_insns PARAMS ((FILE *));
18e720b3 1785extern void schedule_ebbs PARAMS ((FILE *));
ac957f13 1786#endif
cdadb1dd 1787extern void fix_sched_param PARAMS ((const char *, const char *));
ac957f13
JL		 1788
1789/* In print-rtl.c */
47c10e9b 1790extern const char *print_rtx_head;
cdadb1dd
KG		 1791extern void debug_rtx PARAMS ((rtx));
1792extern void debug_rtx_list PARAMS ((rtx, int));
4c85a96d 1793extern void debug_rtx_range PARAMS ((rtx, rtx));
cdadb1dd 1794extern rtx debug_rtx_find PARAMS ((rtx, int));
ac957f13 1795#ifdef BUFSIZ
cdadb1dd 1796extern void print_rtl PARAMS ((FILE *, rtx));
75b7557d 1797extern void print_simple_rtl PARAMS ((FILE *, rtx));
cdadb1dd
KG		 1798extern int print_rtl_single PARAMS ((FILE *, rtx));
1799extern void print_inline_rtx PARAMS ((FILE *, rtx, int));
ac957f13
JL		 1800#endif
1801
1802/* In loop.c */
cdadb1dd
KG		 1803extern void init_loop PARAMS ((void));
1804extern rtx libcall_other_reg PARAMS ((rtx, rtx));
ac957f13 1805#ifdef BUFSIZ
1bf14ad7 1806extern void loop_optimize PARAMS ((rtx, FILE *, int));
ac957f13 1807#endif
cdadb1dd 1808extern void record_excess_regs PARAMS ((rtx, rtx, rtx *));
ac957f13
JL		 1809
1810/* In function.c */
cdadb1dd
KG		 1811extern void reposition_prologue_and_epilogue_notes PARAMS ((rtx));
1812extern void thread_prologue_and_epilogue_insns PARAMS ((rtx));
1813extern int prologue_epilogue_contains PARAMS ((rtx));
0a1c58a2 1814extern int sibcall_epilogue_contains PARAMS ((rtx));
591ccf92 1815extern void preserve_rtl_expr_result PARAMS ((rtx));
cdadb1dd
KG		 1816extern void mark_temp_addr_taken PARAMS ((rtx));
1817extern void update_temp_slot_address PARAMS ((rtx, rtx));
cdadb1dd 1818extern void purge_addressof PARAMS ((rtx));
659e47fb 1819extern void purge_hard_subreg_sets PARAMS ((rtx));
ac957f13 1820
ac957f13 1821/* In stmt.c */
47ee9bcb 1822extern void set_file_and_line_for_stmt PARAMS ((const char *, int));
cdadb1dd
KG		 1823extern void expand_null_return PARAMS ((void));
1824extern void emit_jump PARAMS ((rtx));
1825extern int preserve_subexpressions_p PARAMS ((void));
ac957f13
JL		 1826
1827/* In expr.c */
3bdf5ad1
RK		 1828extern void move_by_pieces PARAMS ((rtx, rtx,
1829 unsigned HOST_WIDE_INT,
1830 unsigned int));
2e245dac 1831
ac957f13 1832/* In flow.c */
cdadb1dd 1833extern void recompute_reg_usage PARAMS ((rtx, int));
ac957f13 1834#ifdef BUFSIZ
cdadb1dd
KG		 1835extern void print_rtl_with_bb PARAMS ((FILE *, rtx));
1836extern void dump_flow_info PARAMS ((FILE *));
ac957f13
JL		 1837#endif
1838
1839/* In expmed.c */
cdadb1dd
KG		 1840extern void init_expmed PARAMS ((void));
1841extern void expand_inc PARAMS ((rtx, rtx));
1842extern void expand_dec PARAMS ((rtx, rtx));
1843extern rtx expand_mult_highpart PARAMS ((enum machine_mode, rtx,
ac957f13
JL		 1844 unsigned HOST_WIDE_INT, rtx,
1845 int, int));
1846
50b2596f
KG		 1847/* In gcse.c */
1848#ifdef BUFSIZ
cdadb1dd 1849extern int gcse_main PARAMS ((rtx, FILE *));
50b2596f
KG		 1850#endif
1851
ac957f13 1852/* In global.c */
cdadb1dd 1853extern void mark_elimination PARAMS ((int, int));
ac957f13 1854#ifdef BUFSIZ
cdadb1dd
KG		 1855extern int global_alloc PARAMS ((FILE *));
1856extern void dump_global_regs PARAMS ((FILE *));
ac957f13 1857#endif
cab634f2 1858#ifdef HARD_CONST
cdadb1dd 1859extern void retry_global_alloc PARAMS ((int, HARD_REG_SET));
cab634f2 1860#endif
d29c259b 1861extern void build_insn_chain PARAMS ((rtx));
ac957f13
JL		 1862
1863/* In regclass.c */
cdadb1dd
KG		 1864extern int reg_classes_intersect_p PARAMS ((enum reg_class, enum reg_class));
1865extern int reg_class_subset_p PARAMS ((enum reg_class, enum reg_class));
1866extern void globalize_reg PARAMS ((int));
1867extern void init_regs PARAMS ((void));
1868extern void init_reg_sets PARAMS ((void));
1869extern void regset_release_memory PARAMS ((void));
1870extern void regclass_init PARAMS ((void));
1871extern void regclass PARAMS ((rtx, int, FILE *));
770ae6cc
RK		 1872extern void reg_scan PARAMS ((rtx, unsigned int, int));
1873extern void reg_scan_update PARAMS ((rtx, rtx, unsigned int));
cdadb1dd
KG		 1874extern void fix_register PARAMS ((const char *, int, int));
1875
1876extern void delete_null_pointer_checks PARAMS ((rtx));
a157febd 1877
50b2596f
KG		 1878/* In regmove.c */
1879#ifdef BUFSIZ
cdadb1dd 1880extern void regmove_optimize PARAMS ((rtx, int, FILE *));
50b2596f 1881#endif
1e7f0a48 1882extern void combine_stack_adjustments PARAMS ((void));
50b2596f
KG		 1883
1884/* In reorg.c */
1885#ifdef BUFSIZ
cdadb1dd 1886extern void dbr_schedule PARAMS ((rtx, FILE *));
50b2596f
KG		 1887#endif
1888
ac957f13
JL		 1889/* In local-alloc.c */
1890#ifdef BUFSIZ
cdadb1dd 1891extern void dump_local_alloc PARAMS ((FILE *));
ac957f13 1892#endif
cdadb1dd
KG		 1893extern int local_alloc PARAMS ((void));
1894extern int function_invariant_p PARAMS ((rtx));
ac957f13 1895
ac957f13 1896/* In profile.c */
cdadb1dd 1897extern void init_branch_prob PARAMS ((const char *));
51891abe
JH		 1898extern void branch_prob PARAMS ((void));
1899extern void end_branch_prob PARAMS ((void));
cdadb1dd 1900extern void output_func_start_profiler PARAMS ((void));
ac957f13
JL		 1901
1902/* In reg-stack.c */
1903#ifdef BUFSIZ
cdadb1dd 1904extern void reg_to_stack PARAMS ((rtx, FILE *));
ac957f13 1905#endif
ac957f13
JL		 1906
1907/* In fold-const.c */
05bccae2
RK		 1908extern int add_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1909 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1910 unsigned HOST_WIDE_INT *,
1911 HOST_WIDE_INT *));
1912extern int neg_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1913 unsigned HOST_WIDE_INT *,
1914 HOST_WIDE_INT *));
1915extern int mul_double PARAMS ((unsigned HOST_WIDE_INT,
1916 HOST_WIDE_INT,
1917 unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1918 unsigned HOST_WIDE_INT *,
1919 HOST_WIDE_INT *));
1920extern void lshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1921 HOST_WIDE_INT, unsigned int,
1922 unsigned HOST_WIDE_INT *,
1923 HOST_WIDE_INT *, int));
1924extern void rshift_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1925 HOST_WIDE_INT, unsigned int,
1926 unsigned HOST_WIDE_INT *,
1927 HOST_WIDE_INT *, int));
1928extern void lrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1929 HOST_WIDE_INT, unsigned int,
1930 unsigned HOST_WIDE_INT *,
1931 HOST_WIDE_INT *));
1932extern void rrotate_double PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1933 HOST_WIDE_INT, unsigned int,
1934 unsigned HOST_WIDE_INT *,
1935 HOST_WIDE_INT *));
ac957f13
JL		 1936
1937/* In calls.c */
ebb1b59a
BS		 1938enum libcall_type
1939{
1940 LCT_NORMAL = 0,
1941 LCT_CONST = 1,
1942 LCT_PURE = 2,
1943 LCT_CONST_MAKE_BLOCK = 3,
695ee791 1944 LCT_PURE_MAKE_BLOCK = 4,
9555a122
RH		 1945 LCT_NORETURN = 5,
1946 LCT_THROW = 6
ebb1b59a
BS		 1947};
1948
1949extern void emit_library_call PARAMS ((rtx, enum libcall_type,
1950 enum machine_mode, int,
1951 ...));
1952extern rtx emit_library_call_value PARAMS ((rtx, rtx, enum libcall_type,
1953 enum machine_mode, int,
1954 ...));
ac957f13
JL		 1955
1956/* In unroll.c */
cdadb1dd 1957extern int set_dominates_use PARAMS ((int, int, int, rtx, rtx));
ac957f13
JL		 1958
1959/* In varasm.c */
cdadb1dd 1960extern int in_data_section PARAMS ((void));
cdadb1dd 1961extern void init_varasm_once PARAMS ((void));
ac957f13
JL		 1962
1963/* In rtl.c */
cdadb1dd 1964extern void init_rtl PARAMS ((void));
c25c12b8
R		 1965extern void traverse_md_constants PARAMS ((int (*) (void **, void *),
1966 void *));
1967struct md_constant { char *name, *value; };
ac957f13 1968
bcdaba58 1969#ifdef BUFSIZ
cdadb1dd
KG		 1970extern int read_skip_spaces PARAMS ((FILE *));
1971extern rtx read_rtx PARAMS ((FILE *));
bcdaba58
RH		 1972#endif
1973
1974extern const char *read_rtx_filename;
1975extern int read_rtx_lineno;
1976
987009bf
ZW		 1977/* Redefine abort to report an internal error w/o coredump, and
1978 reporting the location of the error in the source file. This logic
1979 is duplicated in rtl.h and tree.h because every file that needs the
1980 special abort includes one or both. toplev.h gets too few files,
1981 system.h gets too many. */
1982
cdadb1dd 1983extern void fancy_abort PARAMS ((const char *, int, const char *))
987009bf 1984 ATTRIBUTE_NORETURN;
fbfc1192 1985#define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
987009bf 1986
ac957f13 1987/* In alias.c */
db048faf 1988extern rtx canon_rtx PARAMS ((rtx));
cdadb1dd 1989extern int true_dependence PARAMS ((rtx, enum machine_mode, rtx,
e38fe8e0 1990 int (*)(rtx, int)));
a13d4ebf
AM		 1991extern rtx get_addr PARAMS ((rtx));
1992extern int canon_true_dependence PARAMS ((rtx, enum machine_mode, rtx,
1993 rtx, int (*)(rtx, int)));
cdadb1dd
KG		 1994extern int read_dependence PARAMS ((rtx, rtx));
1995extern int anti_dependence PARAMS ((rtx, rtx));
1996extern int output_dependence PARAMS ((rtx, rtx));
1997extern void mark_constant_function PARAMS ((void));
1998extern void init_alias_once PARAMS ((void));
1999extern void init_alias_analysis PARAMS ((void));
2000extern void end_alias_analysis PARAMS ((void));
cdadb1dd 2001extern rtx addr_side_effect_eval PARAMS ((rtx, int, int));
4c649323 2002
0a1c58a2
JL		 2003/* In sibcall.c */
2004typedef enum {
2005 sibcall_use_normal = 1,
2006 sibcall_use_tail_recursion,
2007 sibcall_use_sibcall
2008} sibcall_use_t;
2009
2010extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2011extern void replace_call_placeholder PARAMS ((rtx, sibcall_use_t));
2012
21b2cd73 2013#ifdef STACK_REGS
cdadb1dd 2014extern int stack_regs_mentioned PARAMS ((rtx insn));
21b2cd73
JH		 2015#endif
2016
a157febd 2017/* In toplev.c */
a157febd 2018extern rtx stack_limit_rtx;
dfdb644f 2019
7b82b5da 2020/* In regrename.c */
7b82b5da
SC		 2021extern void regrename_optimize PARAMS ((void));
2022
2ea64f10
RH		 2023/* In condexec.c */
2024extern void if_convert PARAMS ((int));
2025
88657302 2026#endif /* ! GCC_RTL_H */
GNU Compiler Collection
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