source: trunk/third/gcc/rtl.h @ 8834

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1/* Register Transfer Language (RTL) definitions for GNU C-Compiler
2   Copyright (C) 1987, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21
22#include "machmode.h"
23
24#undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
25#undef FLOAT /* Likewise.  */
26#undef ABS /* Likewise.  */
27#undef PC /* Likewise.  */
28
29#ifndef TREE_CODE
30union tree_node;
31#endif
32
33/* Register Transfer Language EXPRESSIONS CODES */
34
35#define RTX_CODE        enum rtx_code
36enum rtx_code  {
37
38#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
39#include "rtl.def"              /* rtl expressions are documented here */
40#undef DEF_RTL_EXPR
41
42  LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
43                                   NUM_RTX_CODE.
44                                   Assumes default enum value assignment.  */
45
46#define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
47                                /* The cast here, saves many elsewhere.  */
48
49extern int rtx_length[];
50#define GET_RTX_LENGTH(CODE)            (rtx_length[(int)(CODE)])
51
52extern char *rtx_name[];
53#define GET_RTX_NAME(CODE)              (rtx_name[(int)(CODE)])
54
55extern char *rtx_format[];
56#define GET_RTX_FORMAT(CODE)            (rtx_format[(int)(CODE)])
57
58extern char rtx_class[];
59#define GET_RTX_CLASS(CODE)             (rtx_class[(int)(CODE)])
60
61/* Common union for an element of an rtx.  */
62
63typedef union rtunion_def
64{
65  HOST_WIDE_INT rtwint;
66  int rtint;
67  char *rtstr;
68  struct rtx_def *rtx;
69  struct rtvec_def *rtvec;
70  enum machine_mode rttype;
71} rtunion;
72
73/* RTL expression ("rtx").  */
74
75typedef struct rtx_def
76{
77#ifdef ONLY_INT_FIELDS
78#ifdef CODE_FIELD_BUG
79  unsigned int code : 16;
80#else
81  unsigned short code;
82#endif
83#else
84  /* The kind of expression this is.  */
85  enum rtx_code code : 16;
86#endif
87  /* The kind of value the expression has.  */
88#ifdef ONLY_INT_FIELDS
89  int mode : 8;
90#else
91  enum machine_mode mode : 8;
92#endif
93  /* 1 in an INSN if it can alter flow of control
94     within this function.  Not yet used!  */
95  unsigned int jump : 1;
96  /* 1 in an INSN if it can call another function.  Not yet used!  */
97  unsigned int call : 1;
98  /* 1 in a MEM or REG if value of this expression will never change
99     during the current function, even though it is not
100     manifestly constant.
101     1 in a SUBREG if it is from a promoted variable that is unsigned.
102     1 in a SYMBOL_REF if it addresses something in the per-function
103     constants pool.
104     1 in a CALL_INSN if it is a const call.
105     1 in a JUMP_INSN if it is a branch that should be annulled.  Valid from
106     reorg until end of compilation; cleared before used.  */
107  unsigned int unchanging : 1;
108  /* 1 in a MEM expression if contents of memory are volatile.
109     1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
110     if it is deleted.
111     1 in a REG expression if corresponds to a variable declared by the user.
112     0 for an internally generated temporary.
113     In a SYMBOL_REF, this flag is used for machine-specific purposes.
114     In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P.  */
115  unsigned int volatil : 1;
116  /* 1 in a MEM referring to a field of a structure (not a union!).
117     0 if the MEM was a variable or the result of a * operator in C;
118     1 if it was the result of a . or -> operator (on a struct) in C.
119     1 in a REG if the register is used only in exit code a loop.
120     1 in a SUBREG expression if was generated from a variable with a
121     promoted mode.
122     1 in a CODE_LABEL if the label is used for nonlocal gotos
123     and must not be deleted even if its count is zero.
124     1 in a LABEL_REF if this is a reference to a label outside the
125     current loop.
126     1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
127     together with the preceding insn.  Valid only within sched.
128     1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
129     from the target of a branch.  Valid from reorg until end of compilation;
130     cleared before used.  */
131  unsigned int in_struct : 1;
132  /* 1 if this rtx is used.  This is used for copying shared structure.
133     See `unshare_all_rtl'.
134     In a REG, this is not needed for that purpose, and used instead
135     in `leaf_renumber_regs_insn'.
136     In a SYMBOL_REF, means that emit_library_call
137     has used it as the function.  */
138  unsigned int used : 1;
139  /* Nonzero if this rtx came from procedure integration.
140     In a REG, nonzero means this reg refers to the return value
141     of the current function.  */
142  unsigned integrated : 1;
143  /* The first element of the operands of this rtx.
144     The number of operands and their types are controlled
145     by the `code' field, according to rtl.def.  */
146  rtunion fld[1];
147} *rtx;
148
149
150/* Add prototype support.  */
151#ifndef PROTO
152#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
153#define PROTO(ARGS) ARGS
154#else
155#define PROTO(ARGS) ()
156#endif
157#endif
158
159#ifndef VPROTO
160#ifdef __STDC__
161#define PVPROTO(ARGS)           ARGS
162#define VPROTO(ARGS)            ARGS
163#define VA_START(va_list,var)   va_start(va_list,var)
164#else
165#define PVPROTO(ARGS)           ()
166#define VPROTO(ARGS)            (va_alist) va_dcl
167#define VA_START(va_list,var)   va_start(va_list)
168#endif
169#endif
170
171#ifndef STDIO_PROTO
172#ifdef BUFSIZ
173#define STDIO_PROTO(ARGS) PROTO(ARGS)
174#else
175#define STDIO_PROTO(ARGS) ()
176#endif
177#endif
178
179#define NULL_RTX (rtx) 0
180
181/* Define a generic NULL if one hasn't already been defined.  */
182
183#ifndef NULL
184#define NULL 0
185#endif
186
187#ifndef GENERIC_PTR
188#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
189#define GENERIC_PTR void *
190#else
191#define GENERIC_PTR char *
192#endif
193#endif
194
195#ifndef NULL_PTR
196#define NULL_PTR ((GENERIC_PTR)0)
197#endif
198
199/* Define macros to access the `code' field of the rtx.  */
200
201#ifdef SHORT_ENUM_BUG
202#define GET_CODE(RTX)           ((enum rtx_code) ((RTX)->code))
203#define PUT_CODE(RTX, CODE)     ((RTX)->code = ((short) (CODE)))
204#else
205#define GET_CODE(RTX)           ((RTX)->code)
206#define PUT_CODE(RTX, CODE)     ((RTX)->code = (CODE))
207#endif
208
209#define GET_MODE(RTX)           ((RTX)->mode)
210#define PUT_MODE(RTX, MODE)     ((RTX)->mode = (MODE))
211
212#define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
213#define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
214
215/* RTL vector.  These appear inside RTX's when there is a need
216   for a variable number of things.  The principle use is inside
217   PARALLEL expressions.  */
218
219typedef struct rtvec_def{
220  unsigned num_elem;            /* number of elements */
221  rtunion elem[1];
222} *rtvec;
223
224#define NULL_RTVEC (rtvec) 0
225
226#define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
227#define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (unsigned) NUM)
228
229#define RTVEC_ELT(RTVEC, I)  ((RTVEC)->elem[(I)].rtx)
230
231/* 1 if X is a REG.  */
232
233#define REG_P(X) (GET_CODE (X) == REG)
234
235/* 1 if X is a constant value that is an integer.  */
236
237#define CONSTANT_P(X)   \
238  (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF              \
239   || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE         \
240   || GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
241
242/* General accessor macros for accessing the fields of an rtx.  */
243
244#define XEXP(RTX, N)    ((RTX)->fld[N].rtx)
245#define XINT(RTX, N)    ((RTX)->fld[N].rtint)
246#define XWINT(RTX, N)   ((RTX)->fld[N].rtwint)
247#define XSTR(RTX, N)    ((RTX)->fld[N].rtstr)
248#define XVEC(RTX, N)    ((RTX)->fld[N].rtvec)
249#define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
250#define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
251
252/* ACCESS MACROS for particular fields of insns.  */
253
254/* Holds a unique number for each insn.
255   These are not necessarily sequentially increasing.  */
256#define INSN_UID(INSN)  ((INSN)->fld[0].rtint)
257
258/* Chain insns together in sequence.  */
259#define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
260#define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
261
262/* The body of an insn.  */
263#define PATTERN(INSN)   ((INSN)->fld[3].rtx)
264
265/* Code number of instruction, from when it was recognized.
266   -1 means this instruction has not been recognized yet.  */
267#define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
268
269/* Set up in flow.c; empty before then.
270   Holds a chain of INSN_LIST rtx's whose first operands point at
271   previous insns with direct data-flow connections to this one.
272   That means that those insns set variables whose next use is in this insn.
273   They are always in the same basic block as this insn.  */
274#define LOG_LINKS(INSN)         ((INSN)->fld[5].rtx)
275
276/* 1 if insn has been deleted.  */
277#define INSN_DELETED_P(INSN) ((INSN)->volatil)
278
279/* 1 if insn is a call to a const function.  */
280#define CONST_CALL_P(INSN) ((INSN)->unchanging)
281
282/* 1 if insn is a branch that should not unconditionally execute its
283   delay slots, i.e., it is an annulled branch.   */
284#define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
285
286/* 1 if insn is in a delay slot and is from the target of the branch.  If
287   the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
288   executed if the branch is taken.  For annulled branches with this bit
289   clear, the insn should be executed only if the branch is not taken.  */
290#define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
291
292/* Holds a list of notes on what this insn does to various REGs.
293   It is a chain of EXPR_LIST rtx's, where the second operand
294   is the chain pointer and the first operand is the REG being described.
295   The mode field of the EXPR_LIST contains not a real machine mode
296   but a value that says what this note says about the REG:
297     REG_DEAD means that the value in REG dies in this insn (i.e., it is
298   not needed past this insn).  If REG is set in this insn, the REG_DEAD
299   note may, but need not, be omitted.
300     REG_INC means that the REG is autoincremented or autodecremented.
301     REG_EQUIV describes the insn as a whole; it says that the
302   insn sets a register to a constant value or to be equivalent to
303   a memory address.  If the
304   register is spilled to the stack then the constant value
305   should be substituted for it.  The contents of the REG_EQUIV
306   is the constant value or memory address, which may be different
307   from the source of the SET although it has the same value.
308     REG_EQUAL is like REG_EQUIV except that the destination
309   is only momentarily equal to the specified rtx.  Therefore, it
310   cannot be used for substitution; but it can be used for cse.
311     REG_RETVAL means that this insn copies the return-value of
312   a library call out of the hard reg for return values.  This note
313   is actually an INSN_LIST and it points to the first insn involved
314   in setting up arguments for the call.  flow.c uses this to delete
315   the entire library call when its result is dead.
316     REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
317   of the library call and points at the one that has the REG_RETVAL.
318     REG_WAS_0 says that the register set in this insn held 0 before the insn.
319   The contents of the note is the insn that stored the 0.
320   If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
321   The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
322     REG_NONNEG means that the register is always nonnegative during
323   the containing loop.  This is used in branches so that decrement and
324   branch instructions terminating on zero can be matched.  There must be
325   an insn pattern in the md file named `decrement_and_branch_until_zero'
326   or else this will never be added to any instructions.
327     REG_NO_CONFLICT means there is no conflict *after this insn*
328   between the register in the note and the destination of this insn.
329     REG_UNUSED identifies a register set in this insn and never used.
330     REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
331   CC0, respectively.  Normally, these are required to be consecutive insns,
332   but we permit putting a cc0-setting insn in the delay slot of a branch
333   as long as only one copy of the insn exists.  In that case, these notes
334   point from one to the other to allow code generation to determine what
335   any require information and to properly update CC_STATUS.
336     REG_LABEL points to a CODE_LABEL.  Used by non-JUMP_INSNs to
337   say that the CODE_LABEL contained in the REG_LABEL note is used
338   by the insn.
339     REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
340   dependencies.  REG_DEP_OUTPUT is used in LOG_LINKS which represent output
341   (write after write) dependencies.  Data dependencies, which are the only
342   type of LOG_LINK created by flow, are represented by a 0 reg note kind.  */
343
344#define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
345
346/* Don't forget to change reg_note_name in rtl.c.  */
347enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
348                REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
349                REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
350                REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
351                REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
352
353/* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
354#define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
355#define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
356
357/* Names for REG_NOTE's in EXPR_LIST insn's.  */
358
359extern char *reg_note_name[];
360#define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
361
362/* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
363   USE and CLOBBER expressions.
364     USE expressions list the registers filled with arguments that
365   are passed to the function.
366     CLOBBER expressions document the registers explicitly clobbered
367   by this CALL_INSN.
368     Pseudo registers can not be mentioned in this list.  */
369#define CALL_INSN_FUNCTION_USAGE(INSN)  ((INSN)->fld[7].rtx)
370
371/* The label-number of a code-label.  The assembler label
372   is made from `L' and the label-number printed in decimal.
373   Label numbers are unique in a compilation.  */
374#define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
375
376#define LINE_NUMBER NOTE
377
378/* In a NOTE that is a line number, this is a string for the file name
379   that the line is in.  We use the same field to record block numbers
380   temporarily in NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.
381   (We avoid lots of casts between ints and pointers if we use a
382   different macro for the bock number.)  */
383
384#define NOTE_SOURCE_FILE(INSN)  ((INSN)->fld[3].rtstr)
385#define NOTE_BLOCK_NUMBER(INSN) ((INSN)->fld[3].rtint)
386
387/* In a NOTE that is a line number, this is the line number.
388   Other kinds of NOTEs are identified by negative numbers here.  */
389#define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
390
391/* Codes that appear in the NOTE_LINE_NUMBER field
392   for kinds of notes that are not line numbers.
393
394   Notice that we do not try to use zero here for any of
395   the special note codes because sometimes the source line
396   actually can be zero!  This happens (for example) when we
397   are generating code for the per-translation-unit constructor
398   and destructor routines for some C++ translation unit.
399
400   If you should change any of the following values, or if you
401   should add a new value here, don't forget to change the
402   note_insn_name array in rtl.c.  */
403
404/* This note is used to get rid of an insn
405   when it isn't safe to patch the insn out of the chain.  */
406#define NOTE_INSN_DELETED -1
407#define NOTE_INSN_BLOCK_BEG -2
408#define NOTE_INSN_BLOCK_END -3
409#define NOTE_INSN_LOOP_BEG -4
410#define NOTE_INSN_LOOP_END -5
411/* This kind of note is generated at the end of the function body,
412   just before the return insn or return label.
413   In an optimizing compilation it is deleted by the first jump optimization,
414   after enabling that optimizer to determine whether control can fall
415   off the end of the function body without a return statement.  */
416#define NOTE_INSN_FUNCTION_END -6
417/* This kind of note is generated just after each call to `setjmp', et al.  */
418#define NOTE_INSN_SETJMP -7
419/* Generated at the place in a loop that `continue' jumps to.  */
420#define NOTE_INSN_LOOP_CONT -8
421/* Generated at the start of a duplicated exit test.  */
422#define NOTE_INSN_LOOP_VTOP -9
423/* This marks the point immediately after the last prologue insn.  */
424#define NOTE_INSN_PROLOGUE_END -10
425/* This marks the point immediately prior to the first epilogue insn.  */
426#define NOTE_INSN_EPILOGUE_BEG -11
427/* Generated in place of user-declared labels when they are deleted.  */
428#define NOTE_INSN_DELETED_LABEL -12
429/* This note indicates the start of the real body of the function,
430   i.e. the point just after all of the parms have been moved into
431   their homes, etc.  */
432#define NOTE_INSN_FUNCTION_BEG -13
433
434
435#if 0 /* These are not used, and I don't know what they were for. --rms.  */
436#define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
437#define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
438#define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
439#define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
440#define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
441#endif /* 0 */
442
443/* Names for NOTE insn's other than line numbers.  */
444
445extern char *note_insn_name[];
446#define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
447
448/* The name of a label, in case it corresponds to an explicit label
449   in the input source code.  */
450#define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
451
452/* In jump.c, each label contains a count of the number
453   of LABEL_REFs that point at it, so unused labels can be deleted.  */
454#define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
455
456/* The rest is used instead of the above, in a CODE_LABEL,
457   if bytecode is being output.
458   We make the slightly kludgy assumption that a LABEL has enough slots
459   to hold these things.  That happens to be true.  */
460
461/* For static or external objects.  */
462#define BYTECODE_LABEL(X) (XEXP ((X), 0))
463
464/* For goto labels inside bytecode functions.  */
465#define BYTECODE_BC_LABEL(X) (*(struct bc_label **) &XEXP ((X), 1))
466
467/* In jump.c, each JUMP_INSN can point to a label that it can jump to,
468   so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
469   be decremented and possibly the label can be deleted.  */
470#define JUMP_LABEL(INSN)   ((INSN)->fld[7].rtx)
471
472/* Once basic blocks are found in flow.c,
473   each CODE_LABEL starts a chain that goes through
474   all the LABEL_REFs that jump to that label.
475   The chain eventually winds up at the CODE_LABEL; it is circular.  */
476#define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
477
478/* This is the field in the LABEL_REF through which the circular chain
479   of references to a particular label is linked.
480   This chain is set up in flow.c.  */
481
482#define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
483
484/* Once basic blocks are found in flow.c,
485   Each LABEL_REF points to its containing instruction with this field.  */
486
487#define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
488
489/* For a REG rtx, REGNO extracts the register number.  */
490
491#define REGNO(RTX) ((RTX)->fld[0].rtint)
492
493/* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
494   is the current function's return value.  */
495
496#define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
497
498/* 1 in a REG rtx if it corresponds to a variable declared by the user.  */
499#define REG_USERVAR_P(RTX) ((RTX)->volatil)
500
501/* For a CONST_INT rtx, INTVAL extracts the integer.  */
502
503#define INTVAL(RTX) ((RTX)->fld[0].rtwint)
504
505/* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
506   SUBREG_WORD extracts the word-number.  */
507
508#define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
509#define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
510
511/* 1 if the REG contained in SUBREG_REG is already known to be
512   sign- or zero-extended from the mode of the SUBREG to the mode of
513   the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
514   extension. 
515
516   When used as a LHS, is means that this extension must be done
517   when assigning to SUBREG_REG.  */
518
519#define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
520#define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
521
522/* Access various components of an ASM_OPERANDS rtx.  */
523
524#define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
525#define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
526#define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
527#define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
528#define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
529#define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
530#define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
531#define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
532#define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
533#define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
534#define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
535
536/* For a MEM rtx, 1 if it's a volatile reference.
537   Also in an ASM_OPERANDS rtx.  */
538#define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
539
540/* For a MEM rtx, 1 if it refers to a structure or union component.  */
541#define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
542
543/* For a LABEL_REF, 1 means that this reference is to a label outside the
544   loop containing the reference.  */
545#define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
546
547/* For a LABEL_REF, 1 means it is for a nonlocal label.  */
548/* Likewise in an EXPR_LIST for a REG_LABEL note.  */
549#define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
550
551/* For a CODE_LABEL, 1 means always consider this label to be needed.  */
552#define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
553
554/* For a REG, 1 means the register is used only in an exit test of a loop.  */
555#define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
556
557/* During sched, for an insn, 1 means that the insn must be scheduled together
558   with the preceding insn.  */
559#define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
560
561/* During sched, for the LOG_LINKS of an insn, these cache the adjusted
562   cost of the dependence link.  The cost of executing an instruction
563   may vary based on how the results are used.  LINK_COST_ZERO is 1 when
564   the cost through the link varies and is unchanged (i.e., the link has
565   zero additional cost).  LINK_COST_FREE is 1 when the cost through the
566   link is zero (i.e., the link makes the cost free).  In other cases,
567   the adjustment to the cost is recomputed each time it is needed.  */
568#define LINK_COST_ZERO(X) ((X)->jump)
569#define LINK_COST_FREE(X) ((X)->call)
570
571/* For a SET rtx, SET_DEST is the place that is set
572   and SET_SRC is the value it is set to.  */
573#define SET_DEST(RTX) ((RTX)->fld[0].rtx)
574#define SET_SRC(RTX) ((RTX)->fld[1].rtx)
575
576/* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
577#define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
578
579/* 1 in a SYMBOL_REF if it addresses this function's constants pool.  */
580#define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
581
582/* Flag in a SYMBOL_REF for machine-specific purposes.  */
583#define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
584
585/* 1 means a SYMBOL_REF has been the library function in emit_library_call.  */
586#define SYMBOL_REF_USED(RTX) ((RTX)->used)
587
588/* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
589   of the function that is not involved in copying parameters to
590   pseudo-registers.  FIRST_PARM_INSN is the very first insn of
591   the function, including the parameter copying.
592   We keep this around in case we must splice
593   this function into the assembly code at the end of the file.
594   FIRST_LABELNO is the first label number used by the function (inclusive).
595   LAST_LABELNO is the last label used by the function (exclusive).
596   MAX_REGNUM is the largest pseudo-register used by that function.
597   FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
598   POPS_ARGS is the number of bytes of input arguments popped by the function
599   STACK_SLOT_LIST is the list of stack slots.
600   FORCED_LABELS is the list of labels whose address was taken.
601   FUNCTION_FLAGS are where single-bit flags are saved.
602   OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
603   ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
604    for the function arguments.
605   ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
606    function.
607
608   We want this to lay down like an INSN.  The PREV_INSN field
609   is always NULL.  The NEXT_INSN field always points to the
610   first function insn of the function being squirreled away.  */
611
612#define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
613#define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
614#define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
615#define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
616#define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
617#define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
618#define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
619#define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
620#define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
621#define FORCED_LABELS(RTX) ((RTX)->fld[11].rtx)
622#define FUNCTION_FLAGS(RTX) ((RTX)->fld[12].rtint)
623#define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[13].rtint)
624#define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[14].rtvec)
625#define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[15].rtx)
626
627/* In FUNCTION_FLAGS we save some variables computed when emitting the code
628   for the function and which must be `or'ed into the current flag values when
629   insns from that function are being inlined.  */
630
631/* These ought to be an enum, but non-ANSI compilers don't like that.  */
632#define FUNCTION_FLAGS_CALLS_ALLOCA 01
633#define FUNCTION_FLAGS_CALLS_SETJMP 02
634#define FUNCTION_FLAGS_RETURNS_STRUCT 04
635#define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
636#define FUNCTION_FLAGS_NEEDS_CONTEXT 020
637#define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
638#define FUNCTION_FLAGS_RETURNS_POINTER 0100
639#define FUNCTION_FLAGS_USES_CONST_POOL 0200
640#define FUNCTION_FLAGS_CALLS_LONGJMP 0400
641#define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
642
643/* Define a macro to look for REG_INC notes,
644   but save time on machines where they never exist.  */
645
646/* Don't continue this line--convex cc version 4.1 would lose.  */
647#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
648#define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
649#else
650#define FIND_REG_INC_NOTE(insn, reg) 0
651#endif
652
653/* Indicate whether the machine has any sort of auto increment addressing.
654   If not, we can avoid checking for REG_INC notes.  */
655
656/* Don't continue this line--convex cc version 4.1 would lose.  */
657#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
658#define AUTO_INC_DEC
659#endif
660
661/* Generally useful functions.  */
662
663/* The following functions accept a wide integer argument.  Rather than
664   having to cast on every function call, we use a macro instead, that is
665   defined here and in tree.h.  */
666
667#ifndef exact_log2
668#define exact_log2(N) exact_log2_wide ((HOST_WIDE_INT) (N))
669#define floor_log2(N) floor_log2_wide ((HOST_WIDE_INT) (N))
670#endif
671
672#define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
673
674#define plus_constant_for_output(X,C)  \
675  plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
676
677extern rtx plus_constant_wide            PROTO((rtx, HOST_WIDE_INT));
678extern rtx plus_constant_for_output_wide PROTO((rtx, HOST_WIDE_INT));
679
680#define GEN_INT(N) gen_rtx (CONST_INT, VOIDmode, (HOST_WIDE_INT) (N))
681
682extern rtx bc_gen_rtx ();
683
684extern rtx gen_rtx                      PVPROTO((enum rtx_code,
685                                                 enum machine_mode, ...));
686extern rtvec gen_rtvec                  PVPROTO((int, ...));
687
688extern rtx read_rtx                     STDIO_PROTO((FILE *));
689
690#if 0
691/* At present, don't prototype xrealloc, since all of the callers don't
692   cast their pointers to char *, and all of the xrealloc's don't use
693   void * yet.  */
694extern char *xmalloc                    PROTO((size_t));
695extern char *xrealloc                   PROTO((void *, size_t));
696#else
697extern char *xmalloc ();
698extern char *xrealloc ();
699#endif
700
701extern char *oballoc                    PROTO((int));
702extern char *permalloc                  PROTO((int));
703extern void free                        PROTO((void *));
704extern rtx rtx_alloc                    PROTO((RTX_CODE));
705extern rtvec rtvec_alloc                PROTO((int));
706extern rtx find_reg_note                PROTO((rtx, enum reg_note, rtx));
707extern rtx find_regno_note              PROTO((rtx, enum reg_note, int));
708extern int find_reg_fusage              PROTO((rtx, enum rtx_code, rtx));
709extern int find_regno_fusage            PROTO((rtx, enum rtx_code, int));
710extern HOST_WIDE_INT get_integer_term   PROTO((rtx));
711extern rtx get_related_value            PROTO((rtx));
712extern rtx single_set                   PROTO((rtx));
713extern rtx find_last_value              PROTO((rtx, rtx *, rtx));
714extern rtx copy_rtx                     PROTO((rtx));
715extern rtx copy_rtx_if_shared           PROTO((rtx));
716extern rtx copy_most_rtx                PROTO((rtx, rtx));
717extern rtx replace_rtx                  PROTO((rtx, rtx, rtx));
718extern rtvec gen_rtvec_v                PROTO((int, rtx *));
719extern rtx gen_reg_rtx                  PROTO((enum machine_mode));
720extern rtx gen_label_rtx                PROTO((void));
721extern rtx gen_inline_header_rtx        PROTO((rtx, rtx, int, int, int, int,
722                                               int, int, rtx, rtx, int, int,
723                                               rtvec, rtx));
724extern rtx gen_lowpart_common           PROTO((enum machine_mode, rtx));
725extern rtx gen_lowpart                  PROTO((enum machine_mode, rtx));
726extern rtx gen_lowpart_if_possible      PROTO((enum machine_mode, rtx));
727extern rtx gen_highpart                 PROTO((enum machine_mode, rtx));
728extern rtx gen_realpart                 PROTO((enum machine_mode, rtx));
729extern rtx gen_imagpart                 PROTO((enum machine_mode, rtx));
730extern rtx operand_subword              PROTO((rtx, int, int, enum machine_mode));
731extern rtx operand_subword_force        PROTO((rtx, int, enum machine_mode));
732extern int subreg_lowpart_p             PROTO((rtx));
733extern rtx make_safe_from               PROTO((rtx, rtx));
734extern rtx convert_memory_address       PROTO((enum machine_mode, rtx));
735extern rtx memory_address               PROTO((enum machine_mode, rtx));
736extern rtx get_insns                    PROTO((void));
737extern rtx get_last_insn                PROTO((void));
738extern rtx get_last_insn_anywhere       PROTO((void));
739extern void start_sequence              PROTO((void));
740extern void push_to_sequence            PROTO((rtx));
741extern void end_sequence                PROTO((void));
742extern rtx gen_sequence                 PROTO((void));
743extern rtx immed_double_const           PROTO((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
744extern rtx force_const_mem              PROTO((enum machine_mode, rtx));
745extern rtx force_reg                    PROTO((enum machine_mode, rtx));
746extern rtx get_pool_constant            PROTO((rtx));
747extern enum machine_mode get_pool_mode  PROTO((rtx));
748extern int get_pool_offset              PROTO((rtx));
749extern rtx simplify_subtraction         PROTO((rtx));
750extern rtx assign_stack_local           PROTO((enum machine_mode, int, int));
751extern rtx assign_stack_temp            PROTO((enum machine_mode, int, int));
752extern rtx protect_from_queue           PROTO((rtx, int));
753extern void emit_queue                  PROTO((void));
754extern rtx emit_move_insn               PROTO((rtx, rtx));
755extern rtx emit_insn_before             PROTO((rtx, rtx));
756extern rtx emit_jump_insn_before        PROTO((rtx, rtx));
757extern rtx emit_call_insn_before        PROTO((rtx, rtx));
758extern rtx emit_barrier_before          PROTO((rtx));
759extern rtx emit_note_before             PROTO((int, rtx));
760extern rtx emit_insn_after              PROTO((rtx, rtx));
761extern rtx emit_jump_insn_after         PROTO((rtx, rtx));
762extern rtx emit_barrier_after           PROTO((rtx));
763extern rtx emit_label_after             PROTO((rtx, rtx));
764extern rtx emit_note_after              PROTO((int, rtx));
765extern rtx emit_line_note_after         PROTO((char *, int, rtx));
766extern rtx emit_insn                    PROTO((rtx));
767extern rtx emit_insns                   PROTO((rtx));
768extern rtx emit_insns_before            PROTO((rtx, rtx));
769extern rtx emit_insns_after             PROTO((rtx, rtx));
770extern rtx emit_jump_insn               PROTO((rtx));
771extern rtx emit_call_insn               PROTO((rtx));
772extern rtx emit_label                   PROTO((rtx));
773extern rtx emit_barrier                 PROTO((void));
774extern rtx emit_line_note               PROTO((char *, int));
775extern rtx emit_note                    PROTO((char *, int));
776extern rtx emit_line_note_force         PROTO((char *, int));
777extern rtx make_insn_raw                PROTO((rtx));
778extern rtx previous_insn                PROTO((rtx));
779extern rtx next_insn                    PROTO((rtx));
780extern rtx prev_nonnote_insn            PROTO((rtx));
781extern rtx next_nonnote_insn            PROTO((rtx));
782extern rtx prev_real_insn               PROTO((rtx));
783extern rtx next_real_insn               PROTO((rtx));
784extern rtx prev_active_insn             PROTO((rtx));
785extern rtx next_active_insn             PROTO((rtx));
786extern rtx prev_label                   PROTO((rtx));
787extern rtx next_label                   PROTO((rtx));
788extern rtx next_cc0_user                PROTO((rtx));
789extern rtx prev_cc0_setter              PROTO((rtx));
790extern rtx reg_set_last                 PROTO((rtx, rtx));
791extern rtx next_nondeleted_insn         PROTO((rtx));
792extern enum rtx_code reverse_condition  PROTO((enum rtx_code));
793extern enum rtx_code swap_condition     PROTO((enum rtx_code));
794extern enum rtx_code unsigned_condition PROTO((enum rtx_code));
795extern enum rtx_code signed_condition   PROTO((enum rtx_code));
796extern rtx find_equiv_reg               PROTO((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
797extern rtx squeeze_notes                PROTO((rtx, rtx));
798extern rtx delete_insn                  PROTO((rtx));
799extern void delete_jump                 PROTO((rtx));
800extern rtx get_label_before             PROTO((rtx));
801extern rtx get_label_after              PROTO((rtx));
802extern rtx follow_jumps                 PROTO((rtx));
803extern rtx adj_offsettable_operand      PROTO((rtx, int));
804extern rtx try_split                    PROTO((rtx, rtx, int));
805extern rtx split_insns                  PROTO((rtx, rtx));
806extern rtx simplify_unary_operation     PROTO((enum rtx_code, enum machine_mode, rtx, enum machine_mode));
807extern rtx simplify_binary_operation    PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
808extern rtx simplify_ternary_operation   PROTO((enum rtx_code, enum machine_mode, enum machine_mode, rtx, rtx, rtx));
809extern rtx simplify_relational_operation PROTO((enum rtx_code, enum machine_mode, rtx, rtx));
810extern rtx nonlocal_label_rtx_list      PROTO((void));
811extern rtx gen_move_insn                PROTO((rtx, rtx));
812extern rtx gen_jump                     PROTO((rtx));
813extern rtx gen_beq                      PROTO((rtx));
814extern rtx gen_bge                      PROTO((rtx));
815extern rtx gen_ble                      PROTO((rtx));
816extern rtx eliminate_constant_term      PROTO((rtx, rtx *));
817extern rtx expand_complex_abs           PROTO((enum machine_mode, rtx, rtx, int));
818extern enum machine_mode choose_hard_reg_mode PROTO((int, int));
819
820/* Maximum number of parallel sets and clobbers in any insn in this fn.
821   Always at least 3, since the combiner could put that many togetherm
822   and we want this to remain correct for all the remaining passes.  */
823
824extern int max_parallel;
825
826extern int asm_noperands                PROTO((rtx));
827extern char *decode_asm_operands        PROTO((rtx, rtx *, rtx **, char **, enum machine_mode *));
828
829extern enum reg_class reg_preferred_class PROTO((int));
830extern enum reg_class reg_alternate_class PROTO((int));
831
832extern rtx get_first_nonparm_insn       PROTO((void));
833
834/* Standard pieces of rtx, to be substituted directly into things.  */
835extern rtx pc_rtx;
836extern rtx cc0_rtx;
837extern rtx const0_rtx;
838extern rtx const1_rtx;
839extern rtx const2_rtx;
840extern rtx constm1_rtx;
841extern rtx const_true_rtx;
842
843extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
844
845/* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
846   same as VOIDmode.  */
847
848#define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
849
850/* Likewise, for the constants 1 and 2.  */
851
852#define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
853#define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
854
855/* All references to certain hard regs, except those created
856   by allocating pseudo regs into them (when that's possible),
857   go through these unique rtx objects.  */
858extern rtx stack_pointer_rtx;
859extern rtx frame_pointer_rtx;
860extern rtx hard_frame_pointer_rtx;
861extern rtx arg_pointer_rtx;
862extern rtx pic_offset_table_rtx;
863extern rtx struct_value_rtx;
864extern rtx struct_value_incoming_rtx;
865extern rtx static_chain_rtx;
866extern rtx static_chain_incoming_rtx;
867
868/* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
869   is used to represent the frame pointer.  This is because the
870   hard frame pointer and the automatic variables are separated by an amount
871   that cannot be determined until after register allocation.  We can assume
872   that in this case ELIMINABLE_REGS will be defined, one action of which
873   will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
874#ifndef HARD_FRAME_POINTER_REGNUM
875#define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
876#endif
877
878/* Virtual registers are used during RTL generation to refer to locations into
879   the stack frame when the actual location isn't known until RTL generation
880   is complete.  The routine instantiate_virtual_regs replaces these with
881   the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
882   a constant.  */
883
884#define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
885
886/* This points to the first word of the incoming arguments passed on the stack,
887   either by the caller or by the callee when pretending it was passed by the
888   caller.  */
889
890extern rtx virtual_incoming_args_rtx;
891
892#define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
893
894/* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
895   variable on the stack.  Otherwise, it points to the first variable on
896   the stack.  */
897
898extern rtx virtual_stack_vars_rtx;
899
900#define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
901
902/* This points to the location of dynamically-allocated memory on the stack
903   immediately after the stack pointer has been adjusted by the amount
904   desired.  */
905
906extern rtx virtual_stack_dynamic_rtx;
907
908#define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
909
910/* This points to the location in the stack at which outgoing arguments should
911   be written when the stack is pre-pushed (arguments pushed using push
912   insns always use sp).  */
913
914extern rtx virtual_outgoing_args_rtx;
915
916#define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
917
918#define LAST_VIRTUAL_REGISTER   ((FIRST_VIRTUAL_REGISTER) + 3)
919
920extern rtx find_next_ref                PROTO((rtx, rtx));
921extern rtx *find_single_use             PROTO((rtx, rtx, rtx *));
922
923/* It is hard to write the prototype for expand_expr, since it needs
924   expr.h to be included for the enumeration.  */
925
926extern rtx expand_expr ();
927
928extern rtx output_constant_def          PROTO((union tree_node *));
929extern rtx immed_real_const             PROTO((union tree_node *));
930extern union tree_node *make_tree       PROTO((union tree_node *, rtx));
931
932/* Abort routines */
933extern void fatal_insn_not_found        PROTO((rtx));
934extern void fatal_insn                  PROTO((char *, rtx));
935
936/* Define a default value for STORE_FLAG_VALUE.  */
937
938#ifndef STORE_FLAG_VALUE
939#define STORE_FLAG_VALUE 1
940#endif
941
942/* Nonzero after end of reload pass.
943   Set to 1 or 0 by toplev.c.  */
944
945extern int reload_completed;
946
947/* Set to 1 while reload_as_needed is operating.
948   Required by some machines to handle any generated moves differently.  */
949
950extern int reload_in_progress;
951
952/* If this is nonzero, we do not bother generating VOLATILE
953   around volatile memory references, and we are willing to
954   output indirect addresses.  If cse is to follow, we reject
955   indirect addresses so a useful potential cse is generated;
956   if it is used only once, instruction combination will produce
957   the same indirect address eventually.  */
958extern int cse_not_expected;
959
960/* Indexed by pseudo register number, gives the rtx for that pseudo.
961   Allocated in parallel with regno_pointer_flag.  */
962extern rtx *regno_reg_rtx;
963
964/* Translates rtx code to tree code, for those codes needed by
965   REAL_ARITHMETIC.  The function returns an int because the caller may not
966   know what `enum tree_code' means.  */
967
968extern int rtx_to_tree_code     PROTO((enum rtx_code));
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