gcc/rtl.h

   1 /* Register Transfer Language (RTL) definitions for GNU C-Compiler
   2    Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2001 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _RTL_H
  23 #define _RTL_H
  24
  25 struct function;
  26
  27 #include "machmode.h"
  28
  29 #undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
  30 #undef FLOAT /* Likewise.  */
  31 #undef ABS /* Likewise.  */
  32 #undef PC /* Likewise.  */
  33
  34 #ifndef TREE_CODE
  35 union tree_node;
  36 #endif
  37
  38 /* Register Transfer Language EXPRESSIONS CODES */
  39
  40 #define RTX_CODE        enum rtx_code
  41 enum rtx_code  {
  42
  43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
  44 #include "rtl.def"              /* rtl expressions are documented here */
  45 #undef DEF_RTL_EXPR
  46
  47   LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
  48                                    NUM_RTX_CODE.
  49                                    Assumes default enum value assignment.  */
  50
  51 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
  52                                 /* The cast here, saves many elsewhere.  */
  53
  54 extern const int rtx_length[];
  55 #define GET_RTX_LENGTH(CODE)            (rtx_length[(int) (CODE)])
  56
  57 extern const char * const rtx_name[];
  58 #define GET_RTX_NAME(CODE)              (rtx_name[(int) (CODE)])
  59
  60 extern const char * const rtx_format[];
  61 #define GET_RTX_FORMAT(CODE)            (rtx_format[(int) (CODE)])
  62
  63 extern const char rtx_class[];
  64 #define GET_RTX_CLASS(CODE)             (rtx_class[(int) (CODE)])
  65 \f
  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.  */
  68 typedef 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
  84 /* Common union for an element of an rtx.  */
  85
  86 typedef union rtunion_def
  87 {
  88   HOST_WIDE_INT rtwint;
  89   int rtint;
  90   unsigned int rtuint;
  91   const char *rtstr;
  92   struct rtx_def *rtx;
  93   struct rtvec_def *rtvec;
  94   enum machine_mode rttype;
  95   addr_diff_vec_flags rt_addr_diff_vec_flags;
  96   struct cselib_val_struct *rt_cselib;
  97   struct bitmap_head_def *rtbit;
  98   union tree_node *rttree;
  99   struct basic_block_def *bb;
 100 } rtunion;
 101
 102 /* RTL expression ("rtx").  */
 103
 104 typedef struct rtx_def
 105 {
 106   /* The kind of expression this is.  */
 107   ENUM_BITFIELD(rtx_code) code: 16;
 108
 109   /* The kind of value the expression has.  */
 110   ENUM_BITFIELD(machine_mode) mode : 8;
 111
 112   /* 1 in an INSN if it can alter flow of control
 113      within this function.
 114      LINK_COST_ZERO in an INSN_LIST.  */
 115   unsigned int jump : 1;
 116   /* 1 in an INSN if it can call another function.
 117      LINK_COST_FREE in an INSN_LIST.  */
 118   unsigned int call : 1;
 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.
 123      1 in a SUBREG if it is from a promoted variable that is unsigned.
 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.
 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.  */
 137   unsigned int volatil : 1;
 138   /* 1 in a MEM referring to a field of an aggregate.
 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.
 142      1 in a SUBREG expression if was generated from a variable with a
 143      promoted mode.
 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
 149      together with the preceding insn.  Valid only within sched.
 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;
 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. */
 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'.
 158      In a REG, this is not needed for that purpose, and used instead
 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
 165      of the current function.  */
 166   unsigned integrated : 1;
 167   /* 1 in an INSN or a SET if this rtx is related to the call frame,
 168      either changing how we compute the frame address or saving and
 169      restoring registers in the prologue and epilogue.
 170      1 in a MEM if the MEM refers to a scalar, rather than a member of
 171      an aggregate.
 172      1 in a REG if the register is a pointer.
 173      1 in a SYMBOL_REF if it addresses something in the per-function
 174      constant string pool.  */
 175   unsigned frame_related : 1;
 176
 177   /* The first element of the operands of this rtx.
 178      The number of operands and their types are controlled
 179      by the `code' field, according to rtl.def.  */
 180   rtunion fld[1];
 181 } *rtx;
 182
 183 #define NULL_RTX (rtx) 0
 184
 185 /* Define macros to access the `code' field of the rtx.  */
 186
 187 #define GET_CODE(RTX)       ((enum rtx_code) (RTX)->code)
 188 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
 189
 190 #define GET_MODE(RTX)       ((enum machine_mode) (RTX)->mode)
 191 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
 192
 193 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
 194 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
 195 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
 196
 197 /* RTL vector.  These appear inside RTX's when there is a need
 198    for a variable number of things.  The principle use is inside
 199    PARALLEL expressions.  */
 200
 201 typedef struct rtvec_def{
 202   int num_elem;         /* number of elements */
 203   struct rtx_def *elem[1];
 204 } *rtvec;
 205
 206 #define NULL_RTVEC (rtvec) 0
 207
 208 #define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
 209 #define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (NUM))
 210
 211 /* Predicate yielding nonzero iff X is an rtl for a register.  */
 212 #define REG_P(X) (GET_CODE (X) == REG)
 213
 214 /* Predicate yielding nonzero iff X is a label insn.  */
 215 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
 216
 217 /* Predicate yielding nonzero iff X is a jump insn.  */
 218 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
 219
 220 /* Predicate yielding nonzero iff X is a note insn.  */
 221 #define NOTE_P(X) (GET_CODE (X) == NOTE)
 222
 223 /* Predicate yielding nonzero iff X is a barrier insn.  */
 224 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
 225
 226 /* Predicate yielding nonzero iff X is a data for a jump table.  */
 227 #define JUMP_TABLE_DATA_P(INSN) \
 228   (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
 229                      GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
 230
 231 /* 1 if X is a constant value that is an integer.  */
 232
 233 #define CONSTANT_P(X)   \
 234   (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF              \
 235    || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE         \
 236    || GET_CODE (X) == CONST || GET_CODE (X) == HIGH                     \
 237    || GET_CODE (X) == CONSTANT_P_RTX)
 238
 239 /* General accessor macros for accessing the fields of an rtx.  */
 240
 241 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 242 /* The bit with a star outside the statement expr and an & inside is
 243    so that N can be evaluated only once.  */
 244 #define RTL_CHECK1(RTX, N, C1) __extension__                            \
 245 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 246      enum rtx_code _code = GET_CODE (_rtx);                             \
 247      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 248        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
 249      if (GET_RTX_FORMAT(_code)[_n] != C1)                               \
 250        rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
 251      &_rtx->fld[_n]; }))
 252
 253 #define RTL_CHECK2(RTX, N, C1, C2) __extension__                        \
 254 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 255      enum rtx_code _code = GET_CODE (_rtx);                             \
 256      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 257        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
 258      if (GET_RTX_FORMAT(_code)[_n] != C1                                \
 259          && GET_RTX_FORMAT(_code)[_n] != C2)                            \
 260        rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__,    \
 261                                __FUNCTION__);                           \
 262      &_rtx->fld[_n]; }))
 263
 264 #define RTL_CHECKC1(RTX, N, C) __extension__                            \
 265 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 266      if (GET_CODE (_rtx) != C)                                          \
 267        rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
 268      &_rtx->fld[_n]; }))
 269
 270 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__                       \
 271 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 272      enum rtx_code _code = GET_CODE (_rtx);                             \
 273      if (_code != C1 && _code != C2)                                    \
 274        rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
 275      &_rtx->fld[_n]; }))
 276
 277 #define RTVEC_ELT(RTVEC, I) __extension__                               \
 278 (*({ rtvec _rtvec = (RTVEC); int _i = (I);                              \
 279      if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec))                         \
 280        rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__,       \
 281                                   __FUNCTION__);                        \
 282      &_rtvec->elem[_i]; }))
 283
 284 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
 285                                            const char *, int, const char *))
 286     ATTRIBUTE_NORETURN;
 287 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
 288                                           const char *, int, const char *))
 289     ATTRIBUTE_NORETURN;
 290 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
 291                                           const char *, int, const char *))
 292     ATTRIBUTE_NORETURN;
 293 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
 294                                           const char *, int, const char *))
 295     ATTRIBUTE_NORETURN;
 296 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
 297                                           const char *, int, const char *))
 298     ATTRIBUTE_NORETURN;
 299 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
 300                                              const char *, int, const char *))
 301     ATTRIBUTE_NORETURN;
 302
 303 #else   /* not ENABLE_RTL_CHECKING */
 304
 305 #define RTL_CHECK1(RTX, N, C1)      ((RTX)->fld[N])
 306 #define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->fld[N])
 307 #define RTL_CHECKC1(RTX, N, C)      ((RTX)->fld[N])
 308 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
 309 #define RTVEC_ELT(RTVEC, I)         ((RTVEC)->elem[I])
 310
 311 #endif
 312
 313 #define XWINT(RTX, N)   (RTL_CHECK1(RTX, N, 'w').rtwint)
 314 #define XINT(RTX, N)    (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
 315 #define XSTR(RTX, N)    (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
 316 #define XEXP(RTX, N)    (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
 317 #define XVEC(RTX, N)    (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
 318 #define XMODE(RTX, N)   (RTL_CHECK1(RTX, N, 'M').rttype)
 319 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
 320 #define XTREE(RTX, N)   (RTL_CHECK1(RTX, N, 't').rttree)
 321 #define XBBDEF(RTX, N)  (RTL_CHECK1(RTX, N, 'B').bb)
 322
 323 #define XVECEXP(RTX, N, M)      RTVEC_ELT (XVEC (RTX, N), M)
 324 #define XVECLEN(RTX, N)         GET_NUM_ELEM (XVEC (RTX, N))
 325
 326 /* These are like XWINT, etc. except that they expect a '0' field instead
 327    of the normal type code.  */
 328
 329 #define X0WINT(RTX, N)     (RTL_CHECK1(RTX, N, '0').rtwint)
 330 #define X0INT(RTX, N)      (RTL_CHECK1(RTX, N, '0').rtint)
 331 #define X0UINT(RTX, N)     (RTL_CHECK1(RTX, N, '0').rtuint)
 332 #define X0STR(RTX, N)      (RTL_CHECK1(RTX, N, '0').rtstr)
 333 #define X0EXP(RTX, N)      (RTL_CHECK1(RTX, N, '0').rtx)
 334 #define X0VEC(RTX, N)      (RTL_CHECK1(RTX, N, '0').rtvec)
 335 #define X0MODE(RTX, N)     (RTL_CHECK1(RTX, N, '0').rttype)
 336 #define X0BITMAP(RTX, N)   (RTL_CHECK1(RTX, N, '0').rtbit)
 337 #define X0TREE(RTX, N)     (RTL_CHECK1(RTX, N, '0').rttree)
 338 #define X0BBDEF(RTX, N)    (RTL_CHECK1(RTX, N, '0').bb)
 339 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1(RTX, N, '0').rt_addr_diff_vec_flags)
 340 #define X0CSELIB(RTX, N)   (RTL_CHECK1(RTX, N, '0').rt_cselib)
 341
 342 #define XCWINT(RTX, N, C)     (RTL_CHECKC1(RTX, N, C).rtwint)
 343 #define XCINT(RTX, N, C)      (RTL_CHECKC1(RTX, N, C).rtint)
 344 #define XCUINT(RTX, N, C)     (RTL_CHECKC1(RTX, N, C).rtuint)
 345 #define XCSTR(RTX, N, C)      (RTL_CHECKC1(RTX, N, C).rtstr)
 346 #define XCEXP(RTX, N, C)      (RTL_CHECKC1(RTX, N, C).rtx)
 347 #define XCVEC(RTX, N, C)      (RTL_CHECKC1(RTX, N, C).rtvec)
 348 #define XCMODE(RTX, N, C)     (RTL_CHECKC1(RTX, N, C).rttype)
 349 #define XCBITMAP(RTX, N, C)   (RTL_CHECKC1(RTX, N, C).rtbit)
 350 #define XCTREE(RTX, N, C)     (RTL_CHECKC1(RTX, N, C).rttree)
 351 #define XCBBDEF(RTX, N, C)    (RTL_CHECKC1(RTX, N, C).bb)
 352 #define XCADVFLAGS(RTX, N, C) (RTL_CHECKC1(RTX, N, C).rt_addr_diff_vec_flags)
 353 #define XCCSELIB(RTX, N, C)   (RTL_CHECKC1(RTX, N, C).rt_cselib)
 354
 355 #define XCVECEXP(RTX, N, M, C)  RTVEC_ELT (XCVEC (RTX, N, C), M)
 356 #define XCVECLEN(RTX, N, C)     GET_NUM_ELEM (XCVEC (RTX, N, C))
 357
 358 #define XC2EXP(RTX, N, C1, C2)      (RTL_CHECKC2(RTX, N, C1, C2).rtx)
 359 \f
 360 /* ACCESS MACROS for particular fields of insns.  */
 361
 362 /* Determines whether X is an insn.  */
 363 #define INSN_P(X)       (GET_RTX_CLASS (GET_CODE(X)) == 'i')
 364
 365 /* Holds a unique number for each insn.
 366    These are not necessarily sequentially increasing.  */
 367 #define INSN_UID(INSN)  XINT(INSN, 0)
 368
 369 /* Chain insns together in sequence.  */
 370 #define PREV_INSN(INSN) XEXP(INSN, 1)
 371 #define NEXT_INSN(INSN) XEXP(INSN, 2)
 372
 373 /* The body of an insn.  */
 374 #define PATTERN(INSN)   XEXP(INSN, 3)
 375
 376 /* Code number of instruction, from when it was recognized.
 377    -1 means this instruction has not been recognized yet.  */
 378 #define INSN_CODE(INSN) XINT(INSN, 4)
 379
 380 /* Set up in flow.c; empty before then.
 381    Holds a chain of INSN_LIST rtx's whose first operands point at
 382    previous insns with direct data-flow connections to this one.
 383    That means that those insns set variables whose next use is in this insn.
 384    They are always in the same basic block as this insn.  */
 385 #define LOG_LINKS(INSN) XEXP(INSN, 5)
 386
 387 /* 1 if insn has been deleted.  */
 388 #define INSN_DELETED_P(INSN) ((INSN)->volatil)
 389
 390 /* 1 if insn is a call to a const function.  */
 391 #define CONST_CALL_P(INSN) ((INSN)->unchanging)
 392
 393 /* 1 if insn (assumed to be a CALL_INSN) is a sibling call.  */
 394 #define SIBLING_CALL_P(INSN) ((INSN)->jump)
 395
 396 /* 1 if insn is a branch that should not unconditionally execute its
 397    delay slots, i.e., it is an annulled branch.   */
 398 #define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
 399
 400 /* 1 if insn is a dead code.  Valid only for dead-code elimination phase. */
 401 #define INSN_DEAD_CODE_P(INSN) ((INSN)->in_struct)
 402
 403 /* 1 if insn is in a delay slot and is from the target of the branch.  If
 404    the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
 405    executed if the branch is taken.  For annulled branches with this bit
 406    clear, the insn should be executed only if the branch is not taken.  */
 407 #define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
 408
 409 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
 410
 411 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
 412
 413 /* Holds a list of notes on what this insn does to various REGs.
 414    It is a chain of EXPR_LIST rtx's, where the second operand is the
 415    chain pointer and the first operand is the REG being described.
 416    The mode field of the EXPR_LIST contains not a real machine mode
 417    but a value from enum reg_note.  */
 418
 419 #define REG_NOTES(INSN) XEXP(INSN, 6)
 420
 421 /* Don't forget to change reg_note_name in rtl.c.  */
 422 enum reg_note
 423 {
 424   /* The value in REG dies in this insn (i.e., it is not needed past
 425      this insn).  If REG is set in this insn, the REG_DEAD note may,
 426      but need not, be omitted.  */
 427   REG_DEAD = 1,
 428
 429   /* The REG is autoincremented or autodecremented.  */
 430   REG_INC,
 431
 432   /* Describes the insn as a whole; it says that the insn sets a register
 433      to a constant value or to be equivalent to a memory address.  If the
 434      register is spilled to the stack then the constant value should be
 435      substituted for it.  The contents of the REG_EQUIV is the constant
 436      value or memory address, which may be different from the source of
 437      the SET although it has the same value.  A REG_EQUIV note may also
 438      appear on an insn which copies a register parameter to a pseudo-register,
 439      if there is a memory address which could be used to hold that
 440      pseudo-register throughout the function.  */
 441   REG_EQUIV,
 442
 443   /* Like REG_EQUIV except that the destination is only momentarily equal
 444      to the specified rtx.  Therefore, it cannot be used for substitution;
 445      but it can be used for cse.  */
 446   REG_EQUAL,
 447
 448   /* The register set in this insn held 0 before the insn.  The contents of
 449      the note is the insn that stored the 0.  If that insn is deleted or
 450      patched to a NOTE, the REG_WAS_0 is inoperative.  The REG_WAS_0 note
 451      is actually an INSN_LIST, not an EXPR_LIST.  */
 452   REG_WAS_0,
 453
 454   /* This insn copies the return-value of a library call out of the hard reg
 455      for return values.  This note is actually an INSN_LIST and it points to
 456      the first insn involved in setting up arguments for the call.  flow.c
 457      uses this to delete the entire library call when its result is dead.  */
 458   REG_RETVAL,
 459
 460   /* The inverse of REG_RETVAL: it goes on the first insn of the library call
 461      and points at the one that has the REG_RETVAL.  This note is also an
 462      INSN_LIST.  */
 463   REG_LIBCALL,
 464
 465   /* The register is always nonnegative during the containing loop.  This is
 466      used in branches so that decrement and branch instructions terminating
 467      on zero can be matched.  There must be an insn pattern in the md file
 468      named `decrement_and_branch_until_zero' or else this will never be added
 469      to any instructions.  */
 470   REG_NONNEG,
 471
 472   /* There is no conflict *after this insn* between the register in the note
 473      and the destination of this insn.  */
 474   REG_NO_CONFLICT,
 475
 476   /* Identifies a register set in this insn and never used.  */
 477   REG_UNUSED,
 478
 479   /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use CC0,
 480      respectively.  Normally, these are required to be consecutive insns, but
 481      we permit putting a cc0-setting insn in the delay slot of a branch as
 482      long as only one copy of the insn exists.  In that case, these notes
 483      point from one to the other to allow code generation to determine what
 484      any require information and to properly update CC_STATUS.  These notes
 485      are INSN_LISTs.  */
 486   REG_CC_SETTER, REG_CC_USER,
 487
 488   /* Points to a CODE_LABEL.  Used by non-JUMP_INSNs to say that the
 489      CODE_LABEL contained in the REG_LABEL note is used by the insn.
 490      This note is an INSN_LIST.  */
 491   REG_LABEL,
 492
 493   /* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
 494      write-after-read and write-after-write dependencies respectively.
 495      Data dependencies, which are the only type of LOG_LINK created by
 496      flow, are represented by a 0 reg note kind.  */
 497   REG_DEP_ANTI, REG_DEP_OUTPUT,
 498
 499   /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs when the flag
 500      -fbranch-probabilities is given.  It has an integer value.  For jumps,
 501      it is the probability that this is a taken branch.  For calls, it is
 502      the probability that this call won't return.  */
 503   REG_BR_PROB,
 504
 505   /* REG_EXEC_COUNT is attached to the first insn of each basic block, and
 506      the first insn after each CALL_INSN.  It indicates how many times this
 507      block was executed.  */
 508   REG_EXEC_COUNT,
 509
 510   /* Attached to a call insn; indicates that the call is malloc-like and
 511      that the pointer returned cannot alias anything else.  */
 512   REG_NOALIAS,
 513
 514   /* Used to optimize rtl generated by dynamic stack allocations for targets
 515      where SETJMP_VIA_SAVE_AREA is true.  */
 516   REG_SAVE_AREA,
 517
 518   /* Attached to JUMP_INSNs only, it holds the branch prediction flags
 519      computed by get_jump_flags() after dbr scheduling is complete.  */
 520   REG_BR_PRED,
 521
 522   /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
 523      for DWARF to interpret what they imply.  The attached rtx is used
 524      instead of intuition.  */
 525   REG_FRAME_RELATED_EXPR,
 526
 527   /* Indicates that REG holds the exception context for the function.
 528      This context is shared by inline functions, so the code to acquire
 529      the real exception context is delayed until after inlining.  */
 530   REG_EH_CONTEXT,
 531
 532   /* Indicates what exception region an INSN belongs in.  This is used to
 533      indicate what region to which a call may throw.  REGION 0 indicates
 534      that a call cannot throw at all.  REGION -1 indicates that it cannot
 535      throw, nor will it execute a non-local goto.  */
 536   REG_EH_REGION,
 537
 538   /* Indicates that a call is actually a call to rethrow, and specifies the
 539      rethrow symbol for the region the rethrow is targetting.  This provides
 540      a way to generate the non standard flow edges required for a rethrow.  */
 541   REG_EH_RETHROW,
 542
 543   /* Used by haifa-sched to save NOTE_INSN notes across scheduling.  */
 544   REG_SAVE_NOTE,
 545
 546   /* Indicates that this insn (which is part of the prologue) computes
 547      a value which might not be used later, and if so it's OK to delete
 548      the insn.  Normally, deleting any insn in the prologue is an error.
 549      At present the parameter is unused and set to (const_int 0).  */
 550   REG_MAYBE_DEAD,
 551
 552   /* Indicates that a call does not return.  */
 553   REG_NORETURN,
 554
 555   /* Indicates that an indirect jump is a non-local goto instead of a
 556      computed goto.  */
 557   REG_NON_LOCAL_GOTO
 558 };
 559
 560 /* The base value for branch probability notes.  */
 561 #define REG_BR_PROB_BASE  10000
 562
 563 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
 564 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
 565 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
 566
 567 /* Names for REG_NOTE's in EXPR_LIST insn's.  */
 568
 569 extern const char * const reg_note_name[];
 570 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
 571
 572 /* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
 573    USE and CLOBBER expressions.
 574      USE expressions list the registers filled with arguments that
 575    are passed to the function.
 576      CLOBBER expressions document the registers explicitly clobbered
 577    by this CALL_INSN.
 578      Pseudo registers can not be mentioned in this list.  */
 579 #define CALL_INSN_FUNCTION_USAGE(INSN)  XEXP(INSN, 7)
 580
 581 /* The label-number of a code-label.  The assembler label
 582    is made from `L' and the label-number printed in decimal.
 583    Label numbers are unique in a compilation.  */
 584 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
 585
 586 #define LINE_NUMBER NOTE
 587
 588 /* In a NOTE that is a line number, this is a string for the file name that the
 589    line is in.  We use the same field to record block numbers temporarily in
 590    NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.  (We avoid lots of casts
 591    between ints and pointers if we use a different macro for the block number.)
 592    The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
 593    information as a rtx in the field.  */
 594
 595 #define NOTE_SOURCE_FILE(INSN)  XCSTR(INSN, 3, NOTE)
 596 #define NOTE_BLOCK(INSN)        XCTREE(INSN, 3, NOTE)
 597 #define NOTE_EH_HANDLER(INSN)   XCINT(INSN, 3, NOTE)
 598 #define NOTE_RANGE_INFO(INSN)   XCEXP(INSN, 3, NOTE)
 599 #define NOTE_LIVE_INFO(INSN)    XCEXP(INSN, 3, NOTE)
 600 #define NOTE_BASIC_BLOCK(INSN)  XCBBDEF(INSN, 3, NOTE)
 601 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
 602
 603 /* In a NOTE that is a line number, this is the line number.
 604    Other kinds of NOTEs are identified by negative numbers here.  */
 605 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
 606
 607 /* Nonzero if INSN is a note marking the beginning of a basic block.  */
 608 #define NOTE_INSN_BASIC_BLOCK_P(INSN)                   \
 609   (GET_CODE (INSN) == NOTE                              \
 610    && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
 611
 612 /* Codes that appear in the NOTE_LINE_NUMBER field
 613    for kinds of notes that are not line numbers.
 614
 615    Notice that we do not try to use zero here for any of
 616    the special note codes because sometimes the source line
 617    actually can be zero!  This happens (for example) when we
 618    are generating code for the per-translation-unit constructor
 619    and destructor routines for some C++ translation unit.
 620
 621    If you should change any of the following values, or if you
 622    should add a new value here, don't forget to change the
 623    note_insn_name array in rtl.c.  */
 624
 625 enum insn_note
 626 {
 627   /* Keep all of these numbers negative.  Adjust as needed.  */
 628   NOTE_INSN_BIAS = -100,
 629
 630   /* This note is used to get rid of an insn
 631      when it isn't safe to patch the insn out of the chain.  */
 632   NOTE_INSN_DELETED,
 633
 634   /* These are used to mark the beginning and end of a lexical block.
 635      See NOTE_BLOCK, identify_blocks and reorder_blocks.  */
 636   NOTE_INSN_BLOCK_BEG,
 637   NOTE_INSN_BLOCK_END,
 638
 639   /* These mark the extremes of a loop.  */
 640   NOTE_INSN_LOOP_BEG,
 641   NOTE_INSN_LOOP_END,
 642
 643   /* Generated at the place in a loop that `continue' jumps to.  */
 644   NOTE_INSN_LOOP_CONT,
 645   /* Generated at the start of a duplicated exit test.  */
 646   NOTE_INSN_LOOP_VTOP,
 647
 648   /* This kind of note is generated at the end of the function body,
 649      just before the return insn or return label.  In an optimizing
 650      compilation it is deleted by the first jump optimization, after
 651      enabling that optimizer to determine whether control can fall
 652      off the end of the function body without a return statement.  */
 653   NOTE_INSN_FUNCTION_END,
 654
 655   /* This kind of note is generated just after each call to `setjmp',
 656      and similar functions that can return twice.  */
 657   NOTE_INSN_SETJMP,
 658
 659   /* This marks the point immediately after the last prologue insn.  */
 660   NOTE_INSN_PROLOGUE_END,
 661
 662   /* This marks the point immediately prior to the first epilogue insn.  */
 663   NOTE_INSN_EPILOGUE_BEG,
 664
 665   /* Generated in place of user-declared labels when they are deleted.  */
 666   NOTE_INSN_DELETED_LABEL,
 667
 668   /* This note indicates the start of the real body of the function,
 669      i.e. the point just after all of the parms have been moved into
 670      their homes, etc.  */
 671   NOTE_INSN_FUNCTION_BEG,
 672
 673   /* These note where exception handling regions begin and end.
 674      Uses NOTE_EH_HANDLER to identify the region in question.  */
 675   NOTE_INSN_EH_REGION_BEG,
 676   NOTE_INSN_EH_REGION_END,
 677
 678   /* Generated whenever a duplicate line number note is output.  For example,
 679      one is output after the end of an inline function, in order to prevent
 680      the line containing the inline call from being counted twice in gcov. */
 681   NOTE_INSN_REPEATED_LINE_NUMBER,
 682
 683   /* Start/end of a live range region, where pseudos allocated on the stack
 684      can be allocated to temporary registers.  Uses NOTE_RANGE_INFO.  */
 685   NOTE_INSN_RANGE_BEG,
 686   NOTE_INSN_RANGE_END,
 687
 688   /* Record which registers are currently live.  Uses NOTE_LIVE_INFO.  */
 689   NOTE_INSN_LIVE,
 690
 691   /* Record the struct for the following basic block.  Uses NOTE_BASIC_BLOCK. */
 692   NOTE_INSN_BASIC_BLOCK,
 693
 694   /* Record the expected value of a register at a location.  Uses
 695      NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)).  */
 696   NOTE_INSN_EXPECTED_VALUE,
 697
 698   NOTE_INSN_MAX
 699 };
 700
 701 /* Names for NOTE insn's other than line numbers.  */
 702
 703 extern const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS];
 704 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
 705   (note_insn_name[(NOTE_CODE) - (int) NOTE_INSN_BIAS])
 706
 707 /* The name of a label, in case it corresponds to an explicit label
 708    in the input source code.  */
 709 #define LABEL_NAME(RTX) XCSTR(RTX, 6, CODE_LABEL)
 710
 711 /* In jump.c, each label contains a count of the number
 712    of LABEL_REFs that point at it, so unused labels can be deleted.  */
 713 #define LABEL_NUSES(RTX) XCINT(RTX, 3, CODE_LABEL)
 714
 715 /* Associate a name with a CODE_LABEL.  */
 716 #define LABEL_ALTERNATE_NAME(RTX) XCSTR(RTX, 7, CODE_LABEL)
 717
 718 /* The original regno this ADDRESSOF was built for.  */
 719 #define ADDRESSOF_REGNO(RTX) XCUINT(RTX, 1, ADDRESSOF)
 720
 721 /* The variable in the register we took the address of.  */
 722 #define ADDRESSOF_DECL(RTX) XCTREE(RTX, 2, ADDRESSOF)
 723
 724 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
 725    so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
 726    be decremented and possibly the label can be deleted.  */
 727 #define JUMP_LABEL(INSN)   XCEXP(INSN, 7, JUMP_INSN)
 728
 729 /* Once basic blocks are found in flow.c,
 730    each CODE_LABEL starts a chain that goes through
 731    all the LABEL_REFs that jump to that label.
 732    The chain eventually winds up at the CODE_LABEL: it is circular.  */
 733 #define LABEL_REFS(LABEL) XCEXP(LABEL, 4, CODE_LABEL)
 734 \f
 735 /* This is the field in the LABEL_REF through which the circular chain
 736    of references to a particular label is linked.
 737    This chain is set up in flow.c.  */
 738
 739 #define LABEL_NEXTREF(REF) XCEXP(REF, 1, LABEL_REF)
 740
 741 /* Once basic blocks are found in flow.c,
 742    Each LABEL_REF points to its containing instruction with this field.  */
 743
 744 #define CONTAINING_INSN(RTX) XCEXP(RTX, 2, LABEL_REF)
 745
 746 /* For a REG rtx, REGNO extracts the register number.  ORIGINAL_REGNO holds
 747    the number the register originally had; for a pseudo register turned into
 748    a hard reg this will hold the old pseudo register number.  */
 749
 750 #define REGNO(RTX) XCUINT(RTX, 0, REG)
 751 #define ORIGINAL_REGNO(RTX) X0UINT(RTX, 1)
 752
 753 /* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
 754    is the current function's return value.  */
 755
 756 #define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
 757
 758 /* 1 in a REG rtx if it corresponds to a variable declared by the user.  */
 759 #define REG_USERVAR_P(RTX) ((RTX)->volatil)
 760
 761 /* 1 in a REG rtx if the register is a pointer.  */
 762 #define REG_POINTER(RTX) ((RTX)->frame_related)
 763
 764 /* 1 if the given register REG corresponds to a hard register.  */
 765 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
 766
 767 /* 1 if the given register number REG_NO corresponds to a hard register.  */
 768 #define HARD_REGISTER_NUM_P(REG_NO) (REG_NO < FIRST_PSEUDO_REGISTER)
 769
 770 /* For a CONST_INT rtx, INTVAL extracts the integer.  */
 771
 772 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
 773
 774 /* For a CONST_DOUBLE:
 775    The usual two ints that hold the value.
 776    For a DImode, that is all there are;
 777     and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
 778    For a float, the number of ints varies,
 779     and CONST_DOUBLE_LOW is the one that should come first *in memory*.
 780     So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
 781 #define CONST_DOUBLE_LOW(r) XCWINT (r, 2, CONST_DOUBLE)
 782 #define CONST_DOUBLE_HIGH(r) XCWINT (r, 3, CONST_DOUBLE)
 783
 784 /* Link for chain of all CONST_DOUBLEs in use in current function.  */
 785 #define CONST_DOUBLE_CHAIN(r) XCEXP (r, 1, CONST_DOUBLE)
 786 /* The MEM which represents this CONST_DOUBLE's value in memory,
 787    or const0_rtx if no MEM has been made for it yet,
 788    or cc0_rtx if it is not on the chain.  */
 789 #define CONST_DOUBLE_MEM(r) XCEXP (r, 0, CONST_DOUBLE)
 790
 791 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
 792    SUBREG_BYTE extracts the byte-number.  */
 793
 794 #define SUBREG_REG(RTX) XCEXP(RTX, 0, SUBREG)
 795 #define SUBREG_BYTE(RTX) XCUINT(RTX, 1, SUBREG)
 796
 797 /* in rtlanal.c */
 798 extern unsigned int subreg_regno_offset         PARAMS ((unsigned int,
 799                                                          enum machine_mode,
 800                                                          unsigned int,
 801                                                          enum machine_mode));
 802 extern unsigned int subreg_regno        PARAMS ((rtx));
 803
 804 /* 1 if the REG contained in SUBREG_REG is already known to be
 805    sign- or zero-extended from the mode of the SUBREG to the mode of
 806    the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
 807    extension.
 808
 809    When used as a LHS, is means that this extension must be done
 810    when assigning to SUBREG_REG.  */
 811
 812 #define SUBREG_PROMOTED_VAR_P(RTX) ((RTX)->in_struct)
 813 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) ((RTX)->unchanging)
 814
 815 /* Access various components of an ASM_OPERANDS rtx.  */
 816
 817 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR ((RTX), 0, ASM_OPERANDS)
 818 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR ((RTX), 1, ASM_OPERANDS)
 819 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT ((RTX), 2, ASM_OPERANDS)
 820 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC ((RTX), 3, ASM_OPERANDS)
 821 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC ((RTX), 4, ASM_OPERANDS)
 822 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP ((RTX), 3, (N), ASM_OPERANDS)
 823 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN ((RTX), 3, ASM_OPERANDS)
 824 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
 825                         XCVECEXP ((RTX), 4, (N), ASM_OPERANDS)
 826 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
 827                         XSTR (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS), 0)
 828 #define ASM_OPERANDS_INPUT_MODE(RTX, N)  \
 829                         GET_MODE (XCVECEXP ((RTX), 4, (N), ASM_OPERANDS))
 830 #define ASM_OPERANDS_SOURCE_FILE(RTX) XCSTR ((RTX), 5, ASM_OPERANDS)
 831 #define ASM_OPERANDS_SOURCE_LINE(RTX) XCINT ((RTX), 6, ASM_OPERANDS)
 832
 833 /* For a MEM rtx, 1 if it's a volatile reference.
 834    Also in an ASM_OPERANDS rtx.  */
 835 #define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
 836
 837 /* For a MEM rtx, 1 if it refers to an aggregate, either to the
 838    aggregate itself of to a field of the aggregate.  If zero, RTX may
 839    or may not be such a reference.  */
 840 #define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
 841
 842 /* For a MEM rtx, 1 if it refers to a scalar.  If zero, RTX may or may
 843    not refer to a scalar.*/
 844 #define MEM_SCALAR_P(RTX) ((RTX)->frame_related)
 845
 846 /* If VAL is non-zero, set MEM_IN_STRUCT_P and clear MEM_SCALAR_P in
 847    RTX.  Otherwise, vice versa.  Use this macro only when you are
 848    *sure* that you know that the MEM is in a structure, or is a
 849    scalar.  VAL is evaluated only once.  */
 850 #define MEM_SET_IN_STRUCT_P(RTX, VAL) do {      \
 851   if (VAL)                                      \
 852     {                                           \
 853       MEM_IN_STRUCT_P (RTX) = 1;                \
 854       MEM_SCALAR_P (RTX) = 0;                   \
 855     }                                           \
 856   else                                          \
 857     {                                           \
 858       MEM_IN_STRUCT_P (RTX) = 0;                \
 859       MEM_SCALAR_P (RTX) = 1;                   \
 860     }                                           \
 861 } while (0)
 862
 863 /* For a MEM rtx, the alias set.  If 0, this MEM is not in any alias
 864    set, and may alias anything.  Otherwise, the MEM can only alias
 865    MEMs in the same alias set.  This value is set in a
 866    language-dependent manner in the front-end, and should not be
 867    altered in the back-end.  These set numbers are tested for zero,
 868    and compared for equality; they have no other significance.  In
 869    some front-ends, these numbers may correspond in some way to types,
 870    or other language-level entities, but they need not, and the
 871    back-end makes no such assumptions.  */
 872 #define MEM_ALIAS_SET(RTX) XCWINT(RTX, 1, MEM)
 873
 874 /* Copy the attributes that apply to memory locations from RHS to LHS.  */
 875 #define MEM_COPY_ATTRIBUTES(LHS, RHS)                   \
 876   (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS),         \
 877    MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS),       \
 878    MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS),             \
 879    MEM_ALIAS_SET (LHS) = MEM_ALIAS_SET (RHS),           \
 880    RTX_UNCHANGING_P (LHS) = RTX_UNCHANGING_P (RHS))
 881
 882 /* For a LABEL_REF, 1 means that this reference is to a label outside the
 883    loop containing the reference.  */
 884 #define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
 885
 886 /* For a LABEL_REF, 1 means it is for a nonlocal label.  */
 887 /* Likewise in an EXPR_LIST for a REG_LABEL note.  */
 888 #define LABEL_REF_NONLOCAL_P(RTX) ((RTX)->volatil)
 889
 890 /* For a CODE_LABEL, 1 means always consider this label to be needed.  */
 891 #define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
 892
 893 /* For a REG, 1 means the register is used only in an exit test of a loop.  */
 894 #define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
 895
 896 /* During sched, for an insn, 1 means that the insn must be scheduled together
 897    with the preceding insn.  */
 898 #define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
 899
 900 /* During sched, for the LOG_LINKS of an insn, these cache the adjusted
 901    cost of the dependence link.  The cost of executing an instruction
 902    may vary based on how the results are used.  LINK_COST_ZERO is 1 when
 903    the cost through the link varies and is unchanged (i.e., the link has
 904    zero additional cost).  LINK_COST_FREE is 1 when the cost through the
 905    link is zero (i.e., the link makes the cost free).  In other cases,
 906    the adjustment to the cost is recomputed each time it is needed.  */
 907 #define LINK_COST_ZERO(X) ((X)->jump)
 908 #define LINK_COST_FREE(X) ((X)->call)
 909
 910 /* For a SET rtx, SET_DEST is the place that is set
 911    and SET_SRC is the value it is set to.  */
 912 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
 913 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
 914
 915 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
 916 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
 917 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
 918
 919 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
 920    conditionally executing the code on, COND_EXEC_CODE is the code
 921    to execute if the condition is true.  */
 922 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
 923 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
 924
 925 /* 1 in a SYMBOL_REF if it addresses this function's constants pool.  */
 926 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
 927
 928 /* 1 in a SYMBOL_REF if it addresses this function's string constant pool.  */
 929 #define STRING_POOL_ADDRESS_P(RTX) ((RTX)->frame_related)
 930
 931 /* Flag in a SYMBOL_REF for machine-specific purposes.  */
 932 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
 933
 934 /* 1 means a SYMBOL_REF has been the library function in emit_library_call.  */
 935 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
 936
 937 /* Define a macro to look for REG_INC notes,
 938    but save time on machines where they never exist.  */
 939
 940 /* Don't continue this line--convex cc version 4.1 would lose.  */
 941 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
 942 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
 943 #else
 944 #define FIND_REG_INC_NOTE(insn, reg) 0
 945 #endif
 946
 947 /* Indicate whether the machine has any sort of auto increment addressing.
 948    If not, we can avoid checking for REG_INC notes.  */
 949
 950 /* Don't continue this line--convex cc version 4.1 would lose.  */
 951 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
 952 #define AUTO_INC_DEC
 953 #endif
 954
 955 #ifndef HAVE_PRE_INCREMENT
 956 #define HAVE_PRE_INCREMENT 0
 957 #endif
 958
 959 #ifndef HAVE_PRE_DECREMENT
 960 #define HAVE_PRE_DECREMENT 0
 961 #endif
 962
 963 #ifndef HAVE_POST_INCREMENT
 964 #define HAVE_POST_INCREMENT 0
 965 #endif
 966
 967 #ifndef HAVE_POST_DECREMENT
 968 #define HAVE_POST_DECREMENT 0
 969 #endif
 970
 971 #ifndef HAVE_POST_MODIFY_DISP
 972 #define HAVE_POST_MODIFY_DISP 0
 973 #endif
 974
 975 #ifndef HAVE_POST_MODIFY_REG
 976 #define HAVE_POST_MODIFY_REG 0
 977 #endif
 978
 979 #ifndef HAVE_PRE_MODIFY_DISP
 980 #define HAVE_PRE_MODIFY_DISP 0
 981 #endif
 982
 983 #ifndef HAVE_PRE_MODIFY_REG
 984 #define HAVE_PRE_MODIFY_REG 0
 985 #endif
 986
 987
 988 /* Some architectures do not have complete pre/post increment/decrement
 989    instruction sets, or only move some modes efficiently.  These macros
 990    allow us to tune autoincrement generation.  */
 991
 992 #ifndef USE_LOAD_POST_INCREMENT
 993 #define USE_LOAD_POST_INCREMENT(MODE)   HAVE_POST_INCREMENT
 994 #endif
 995
 996 #ifndef USE_LOAD_POST_DECREMENT
 997 #define USE_LOAD_POST_DECREMENT(MODE)   HAVE_POST_DECREMENT
 998 #endif
 999
1000 #ifndef USE_LOAD_PRE_INCREMENT
1001 #define USE_LOAD_PRE_INCREMENT(MODE)    HAVE_PRE_INCREMENT
1002 #endif
1003
1004 #ifndef USE_LOAD_PRE_DECREMENT
1005 #define USE_LOAD_PRE_DECREMENT(MODE)    HAVE_PRE_DECREMENT
1006 #endif
1007
1008 #ifndef USE_STORE_POST_INCREMENT
1009 #define USE_STORE_POST_INCREMENT(MODE)  HAVE_POST_INCREMENT
1010 #endif
1011
1012 #ifndef USE_STORE_POST_DECREMENT
1013 #define USE_STORE_POST_DECREMENT(MODE)  HAVE_POST_DECREMENT
1014 #endif
1015
1016 #ifndef USE_STORE_PRE_INCREMENT
1017 #define USE_STORE_PRE_INCREMENT(MODE)   HAVE_PRE_INCREMENT
1018 #endif
1019
1020 #ifndef USE_STORE_PRE_DECREMENT
1021 #define USE_STORE_PRE_DECREMENT(MODE)   HAVE_PRE_DECREMENT
1022 #endif
1023
1024
1025 /* Accessors for RANGE_INFO.  */
1026 /* For RANGE_{START,END} notes return the RANGE_START note.  */
1027 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
1028
1029 /* For RANGE_{START,END} notes return the RANGE_START note.  */
1030 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
1031
1032 /* For RANGE_{START,END} notes, return the vector containing the registers used
1033    in the range.  */
1034 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1035 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1036 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
1037
1038 /* For RANGE_{START,END} notes, the number of calls within the range.  */
1039 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
1040
1041 /* For RANGE_{START,END} notes, the number of insns within the range.  */
1042 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
1043
1044 /* For RANGE_{START,END} notes, a unique # to identify this range.  */
1045 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
1046
1047 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
1048 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
1049
1050 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
1051 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
1052
1053 /* For RANGE_{START,END} notes, the loop depth the range is in.  */
1054 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
1055
1056 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
1057    of the range.  */
1058 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
1059
1060 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
1061    of the range.  */
1062 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
1063
1064 /* For RANGE_START notes, the marker # of the start of the range.  */
1065 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
1066
1067 /* For RANGE_START notes, the marker # of the end of the range.  */
1068 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
1069
1070 /* Original pseudo register # for a live range note.  */
1071 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
1072
1073 /* Pseudo register # original register is copied into or -1.  */
1074 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
1075
1076 /* How many times a register in a live range note was referenced.  */
1077 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
1078
1079 /* How many times a register in a live range note was set.  */
1080 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
1081
1082 /* How many times a register in a live range note died.  */
1083 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
1084
1085 /* Whether the original value is needed to be copied into the range register at
1086    the start of the range. */
1087 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
1088
1089 /* # of insns the register copy is live over.  */
1090 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
1091
1092 /* # of calls the register copy is live over.  */
1093 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1094
1095 /* DECL_NODE pointer of the declaration if the register is a user defined
1096    variable.  */
1097 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1098
1099 /* BLOCK_NODE pointer to the block the variable is declared in if the
1100    register is a user defined variable.  */
1101 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1102
1103 /* EXPR_LIST of the distinct ranges a variable is in.  */
1104 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1105
1106 /* Block a variable is declared in.  */
1107 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1108
1109 /* # of distinct ranges a variable is in.  */
1110 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1111
1112 /* For a NOTE_INSN_LIVE note, the registers which are currently live.  */
1113 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1114
1115 /* For a NOTE_INSN_LIVE note, the original basic block number.  */
1116 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1117
1118 /* Determine if the insn is a PHI node.  */
1119 #define PHI_NODE_P(X)                           \
1120   (X && GET_CODE (X) == INSN                    \
1121    && GET_CODE (PATTERN (X)) == SET             \
1122    && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1123 \f
1124 /* Nonzero if we need to distinguish between the return value of this function
1125    and the return value of a function called by this function.  This helps
1126    integrate.c.
1127    This is 1 until after the rtl generation pass.  */
1128 extern int rtx_equal_function_value_matters;
1129
1130 /* Nonzero when we are generating CONCATs.  */
1131 extern int generating_concat_p;
1132
1133 /* Generally useful functions.  */
1134
1135 /* In expmed.c */
1136 extern int ceil_log2                    PARAMS ((unsigned HOST_WIDE_INT));
1137
1138 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1139
1140 #define plus_constant_for_output(X,C)  \
1141   plus_constant_for_output_wide (X, (HOST_WIDE_INT) (C))
1142
1143 /* In explow.c */
1144 extern void set_stack_check_libfunc PARAMS ((rtx));
1145 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1146                                                enum machine_mode));
1147 extern rtx plus_constant_wide            PARAMS ((rtx, HOST_WIDE_INT));
1148 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1149 extern void optimize_save_area_alloca   PARAMS ((rtx));
1150
1151 /* In emit-rtl.c */
1152 extern rtx gen_rtx                      PARAMS ((enum rtx_code,
1153                                                  enum machine_mode, ...));
1154 extern rtvec gen_rtvec                  PARAMS ((int, ...));
1155
1156 /* In other files */
1157 extern rtx rtx_alloc                    PARAMS ((RTX_CODE));
1158 extern rtvec rtvec_alloc                PARAMS ((int));
1159 extern rtx copy_insn_1                  PARAMS ((rtx));
1160 extern rtx copy_insn                    PARAMS ((rtx));
1161
1162 /* In rtl.c */
1163 extern rtx copy_rtx                     PARAMS ((rtx));
1164
1165 /* In emit-rtl.c */
1166 extern rtx copy_rtx_if_shared           PARAMS ((rtx));
1167
1168 /* In rtl.c */
1169 extern rtx copy_most_rtx                PARAMS ((rtx, rtx));
1170 extern rtx shallow_copy_rtx             PARAMS ((rtx));
1171 extern int rtx_equal_p                  PARAMS ((rtx, rtx));
1172
1173 /* In emit-rtl.c */
1174 extern rtvec gen_rtvec_v                PARAMS ((int, rtx *));
1175 extern rtx gen_reg_rtx                  PARAMS ((enum machine_mode));
1176 extern rtx gen_label_rtx                PARAMS ((void));
1177 extern int subreg_hard_regno            PARAMS ((rtx, int));
1178 extern rtx gen_lowpart_common           PARAMS ((enum machine_mode, rtx));
1179 extern rtx gen_lowpart                  PARAMS ((enum machine_mode, rtx));
1180
1181 /* In cse.c */
1182 extern rtx gen_lowpart_if_possible      PARAMS ((enum machine_mode, rtx));
1183
1184 /* In emit-rtl.c */
1185 extern rtx gen_highpart                 PARAMS ((enum machine_mode, rtx));
1186 extern rtx gen_realpart                 PARAMS ((enum machine_mode, rtx));
1187 extern rtx gen_imagpart                 PARAMS ((enum machine_mode, rtx));
1188 extern rtx operand_subword              PARAMS ((rtx, unsigned int, int,
1189                                                  enum machine_mode));
1190 extern rtx constant_subword             PARAMS ((rtx, int,
1191                                                  enum machine_mode));
1192
1193 /* In emit-rtl.c */
1194 extern rtx operand_subword_force        PARAMS ((rtx, unsigned int,
1195                                                  enum machine_mode));
1196 extern int subreg_lowpart_p             PARAMS ((rtx));
1197 extern rtx make_safe_from               PARAMS ((rtx, rtx));
1198 extern rtx convert_memory_address       PARAMS ((enum machine_mode, rtx));
1199 extern rtx get_insns                    PARAMS ((void));
1200 extern const char *get_insn_name        PARAMS ((int));
1201 extern rtx get_last_insn                PARAMS ((void));
1202 extern rtx get_last_insn_anywhere       PARAMS ((void));
1203 extern void start_sequence              PARAMS ((void));
1204 extern void push_to_sequence            PARAMS ((rtx));
1205 extern void end_sequence                PARAMS ((void));
1206 extern void push_to_full_sequence       PARAMS ((rtx, rtx));
1207 extern void end_full_sequence           PARAMS ((rtx*, rtx*));
1208 extern rtx gen_sequence                 PARAMS ((void));
1209
1210 /* In varasm.c  */
1211 extern rtx immed_double_const           PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1212 extern rtx force_const_mem              PARAMS ((enum machine_mode, rtx));
1213
1214 /* In varasm.c  */
1215 extern rtx get_pool_constant            PARAMS ((rtx));
1216 extern enum machine_mode get_pool_mode  PARAMS ((rtx));
1217 extern rtx get_pool_constant_for_function       PARAMS ((struct function *, rtx));
1218 extern enum machine_mode get_pool_mode_for_function     PARAMS ((struct function *, rtx));
1219 extern int get_pool_offset              PARAMS ((rtx));
1220 extern rtx simplify_subtraction         PARAMS ((rtx));
1221
1222 /* In function.c  */
1223 extern rtx assign_stack_local           PARAMS ((enum machine_mode,
1224                                                HOST_WIDE_INT, int));
1225 extern rtx assign_stack_temp            PARAMS ((enum machine_mode,
1226                                                HOST_WIDE_INT, int));
1227 extern rtx assign_temp                  PARAMS ((union tree_node *,
1228                                                int, int, int));
1229 /* In emit-rtl.c */
1230 extern rtx emit_insn_before             PARAMS ((rtx, rtx));
1231 extern rtx emit_jump_insn_before        PARAMS ((rtx, rtx));
1232 extern rtx emit_call_insn_before        PARAMS ((rtx, rtx));
1233 extern rtx emit_barrier_before          PARAMS ((rtx));
1234 extern rtx emit_label_before            PARAMS ((rtx, rtx));
1235 extern rtx emit_note_before             PARAMS ((int, rtx));
1236 extern rtx emit_insn_after              PARAMS ((rtx, rtx));
1237 extern rtx emit_jump_insn_after         PARAMS ((rtx, rtx));
1238 extern rtx emit_barrier_after           PARAMS ((rtx));
1239 extern rtx emit_label_after             PARAMS ((rtx, rtx));
1240 extern rtx emit_note_after              PARAMS ((int, rtx));
1241 extern rtx emit_line_note_after         PARAMS ((const char *, int, rtx));
1242 extern rtx emit_insn                    PARAMS ((rtx));
1243 extern rtx emit_insns                   PARAMS ((rtx));
1244 extern rtx emit_insns_before            PARAMS ((rtx, rtx));
1245 extern rtx emit_insns_after             PARAMS ((rtx, rtx));
1246 extern rtx emit_jump_insn               PARAMS ((rtx));
1247 extern rtx emit_call_insn               PARAMS ((rtx));
1248 extern rtx emit_label                   PARAMS ((rtx));
1249 extern rtx emit_barrier                 PARAMS ((void));
1250 extern rtx emit_line_note               PARAMS ((const char *, int));
1251 extern rtx emit_note                    PARAMS ((const char *, int));
1252 extern rtx emit_line_note_force         PARAMS ((const char *, int));
1253 extern rtx make_insn_raw                PARAMS ((rtx));
1254 extern rtx previous_insn                PARAMS ((rtx));
1255 extern rtx next_insn                    PARAMS ((rtx));
1256 extern rtx prev_nonnote_insn            PARAMS ((rtx));
1257 extern rtx next_nonnote_insn            PARAMS ((rtx));
1258 extern rtx prev_real_insn               PARAMS ((rtx));
1259 extern rtx next_real_insn               PARAMS ((rtx));
1260 extern rtx prev_active_insn             PARAMS ((rtx));
1261 extern rtx next_active_insn             PARAMS ((rtx));
1262 extern int active_insn_p                PARAMS ((rtx));
1263 extern rtx prev_label                   PARAMS ((rtx));
1264 extern rtx next_label                   PARAMS ((rtx));
1265 extern rtx next_cc0_user                PARAMS ((rtx));
1266 extern rtx prev_cc0_setter              PARAMS ((rtx));
1267
1268 /* In jump.c */
1269 extern rtx next_nondeleted_insn         PARAMS ((rtx));
1270 extern enum rtx_code reverse_condition  PARAMS ((enum rtx_code));
1271 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1272 extern enum rtx_code swap_condition     PARAMS ((enum rtx_code));
1273 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1274 extern enum rtx_code signed_condition   PARAMS ((enum rtx_code));
1275 extern void mark_jump_label             PARAMS ((rtx, rtx, int, int));
1276
1277 /* In reload.c */
1278 extern rtx find_equiv_reg               PARAMS ((rtx, rtx, enum reg_class, int, short *, int, enum machine_mode));
1279
1280 /* In jump.c */
1281 extern rtx squeeze_notes                PARAMS ((rtx, rtx));
1282 extern rtx delete_insn                  PARAMS ((rtx));
1283 extern void delete_jump                 PARAMS ((rtx));
1284 extern void delete_barrier              PARAMS ((rtx));
1285 extern rtx get_label_before             PARAMS ((rtx));
1286 extern rtx get_label_after              PARAMS ((rtx));
1287 extern rtx follow_jumps                 PARAMS ((rtx));
1288
1289 /* In recog.c  */
1290 extern rtx adj_offsettable_operand      PARAMS ((rtx, int));
1291
1292 /* In emit-rtl.c  */
1293 extern rtx try_split                    PARAMS ((rtx, rtx, int));
1294
1295 /* In unknown file  */
1296 extern rtx split_insns                  PARAMS ((rtx, rtx));
1297
1298 /* In simplify-rtx.c  */
1299 extern rtx simplify_unary_operation     PARAMS ((enum rtx_code,
1300                                                  enum machine_mode, rtx,
1301                                                  enum machine_mode));
1302 extern rtx simplify_binary_operation    PARAMS ((enum rtx_code,
1303                                                  enum machine_mode, rtx,
1304                                                  rtx));
1305 extern rtx simplify_ternary_operation   PARAMS ((enum rtx_code,
1306                                                  enum machine_mode,
1307                                                  enum machine_mode, rtx, rtx,
1308                                                  rtx));
1309 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1310                                                   enum machine_mode, rtx,
1311                                                   rtx));
1312 extern rtx simplify_gen_binary          PARAMS ((enum rtx_code,
1313                                                  enum machine_mode,
1314                                                  rtx, rtx));
1315 extern rtx simplify_gen_unary           PARAMS ((enum rtx_code,
1316                                                  enum machine_mode, rtx,
1317                                                  enum machine_mode));
1318 extern rtx simplify_gen_ternary         PARAMS ((enum rtx_code,
1319                                                  enum machine_mode,
1320                                                  enum machine_mode,
1321                                                  rtx, rtx, rtx));
1322 extern rtx simplify_gen_relational      PARAMS ((enum rtx_code,
1323                                                  enum machine_mode,
1324                                                  rtx, rtx));
1325 extern rtx simplify_replace_rtx         PARAMS ((rtx, rtx, rtx));
1326 extern rtx simplify_rtx                 PARAMS ((rtx));
1327
1328 /* In function.c  */
1329 extern rtx gen_mem_addressof            PARAMS ((rtx, union tree_node *));
1330
1331 /* In regclass.c  */
1332 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1333                                                        unsigned int));
1334
1335 /* In emit-rtl.c  */
1336 extern void set_unique_reg_note         PARAMS ((rtx, enum reg_note, rtx));
1337
1338 /* Functions in rtlanal.c */
1339
1340 /* Single set is implemented as macro for performance reasons.  */
1341 #define single_set(I) (INSN_P (I) \
1342                        ? (GET_CODE (PATTERN (I)) == SET \
1343                           ? PATTERN (I) : single_set_1 (I)) \
1344                        : NULL_RTX)
1345 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1346
1347 extern int rtx_addr_can_trap_p          PARAMS ((rtx));
1348 extern int rtx_unstable_p               PARAMS ((rtx));
1349 extern int rtx_varies_p                 PARAMS ((rtx, int));
1350 extern int rtx_addr_varies_p            PARAMS ((rtx, int));
1351 extern HOST_WIDE_INT get_integer_term   PARAMS ((rtx));
1352 extern rtx get_related_value            PARAMS ((rtx));
1353 extern int reg_mentioned_p              PARAMS ((rtx, rtx));
1354 extern int count_occurrences            PARAMS ((rtx, rtx, int));
1355 extern int reg_referenced_p             PARAMS ((rtx, rtx));
1356 extern int reg_used_between_p           PARAMS ((rtx, rtx, rtx));
1357 extern int reg_referenced_between_p     PARAMS ((rtx, rtx, rtx));
1358 extern int reg_set_between_p            PARAMS ((rtx, rtx, rtx));
1359 extern int regs_set_between_p           PARAMS ((rtx, rtx, rtx));
1360 extern int modified_between_p           PARAMS ((rtx, rtx, rtx));
1361 extern int no_labels_between_p          PARAMS ((rtx, rtx));
1362 extern int no_jumps_between_p           PARAMS ((rtx, rtx));
1363 extern int modified_in_p                PARAMS ((rtx, rtx));
1364 extern int insn_dependent_p             PARAMS ((rtx, rtx));
1365 extern int reg_set_p                    PARAMS ((rtx, rtx));
1366 extern rtx single_set_2                 PARAMS ((rtx, rtx));
1367 extern int multiple_sets                PARAMS ((rtx));
1368 extern int set_noop_p                   PARAMS ((rtx));
1369 extern rtx find_last_value              PARAMS ((rtx, rtx *, rtx, int));
1370 extern int refers_to_regno_p            PARAMS ((unsigned int, unsigned int,
1371                                                  rtx, rtx *));
1372 extern int reg_overlap_mentioned_p      PARAMS ((rtx, rtx));
1373 extern rtx set_of                       PARAMS ((rtx, rtx));
1374 extern void note_stores                 PARAMS ((rtx,
1375                                                  void (*) (rtx, rtx, void *),
1376                                                  void *));
1377 extern void note_uses                   PARAMS ((rtx *,
1378                                                  void (*) (rtx *, void *),
1379                                                  void *));
1380 extern rtx reg_set_last                 PARAMS ((rtx, rtx));
1381 extern int dead_or_set_p                PARAMS ((rtx, rtx));
1382 extern int dead_or_set_regno_p          PARAMS ((rtx, unsigned int));
1383 extern rtx find_reg_note                PARAMS ((rtx, enum reg_note, rtx));
1384 extern rtx find_regno_note              PARAMS ((rtx, enum reg_note,
1385                                                  unsigned int));
1386 extern rtx find_reg_equal_equiv_note    PARAMS ((rtx));
1387 extern int find_reg_fusage              PARAMS ((rtx, enum rtx_code, rtx));
1388 extern int find_regno_fusage            PARAMS ((rtx, enum rtx_code,
1389                                                  unsigned int));
1390 extern void remove_note                 PARAMS ((rtx, rtx));
1391 extern int side_effects_p               PARAMS ((rtx));
1392 extern int volatile_refs_p              PARAMS ((rtx));
1393 extern int volatile_insn_p              PARAMS ((rtx));
1394 extern int may_trap_p                   PARAMS ((rtx));
1395 extern int inequality_comparisons_p     PARAMS ((rtx));
1396 extern rtx replace_rtx                  PARAMS ((rtx, rtx, rtx));
1397 extern rtx replace_regs                 PARAMS ((rtx, rtx *, unsigned int,
1398                                                  int));
1399 extern int computed_jump_p              PARAMS ((rtx));
1400 typedef int (*rtx_function)             PARAMS ((rtx *, void *));
1401 extern int for_each_rtx                 PARAMS ((rtx *, rtx_function, void *));
1402 extern rtx regno_use_in                 PARAMS ((unsigned int, rtx));
1403 extern int auto_inc_p                   PARAMS ((rtx));
1404 extern void remove_node_from_expr_list  PARAMS ((rtx, rtx *));
1405 extern int insns_safe_to_move_p         PARAMS ((rtx, rtx, rtx *));
1406 extern int loc_mentioned_in_p           PARAMS ((rtx *, rtx));
1407
1408 /* flow.c */
1409
1410 extern rtx find_use_as_address          PARAMS ((rtx, rtx, HOST_WIDE_INT));
1411 void init_EXPR_INSN_LIST_cache          PARAMS ((void));
1412 void free_EXPR_LIST_list                PARAMS ((rtx *));
1413 void free_INSN_LIST_list                PARAMS ((rtx *));
1414 void free_EXPR_LIST_node                PARAMS ((rtx));
1415 void free_INSN_LIST_node                PARAMS ((rtx));
1416 rtx alloc_INSN_LIST                     PARAMS ((rtx, rtx));
1417 rtx alloc_EXPR_LIST                     PARAMS ((int, rtx, rtx));
1418 void clear_log_links                    PARAMS ((rtx));
1419
1420 /* regclass.c */
1421
1422 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1423    Always at least 3, since the combiner could put that many togetherm
1424    and we want this to remain correct for all the remaining passes.  */
1425
1426 extern int max_parallel;
1427
1428 /* Free up register info memory.  */
1429 extern void free_reg_info               PARAMS ((void));
1430
1431 /* recog.c */
1432 extern int asm_noperands                PARAMS ((rtx));
1433 extern const char *decode_asm_operands  PARAMS ((rtx, rtx *, rtx **,
1434                                                const char **,
1435                                                enum machine_mode *));
1436
1437 extern enum reg_class reg_preferred_class PARAMS ((int));
1438 extern enum reg_class reg_alternate_class PARAMS ((int));
1439
1440 extern rtx get_first_nonparm_insn       PARAMS ((void));
1441
1442 extern void split_all_insns             PARAMS ((int));
1443
1444 #define MAX_SAVED_CONST_INT 64
1445 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1446
1447 #define const0_rtx      (const_int_rtx[MAX_SAVED_CONST_INT])
1448 #define const1_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+1])
1449 #define const2_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+2])
1450 #define constm1_rtx     (const_int_rtx[MAX_SAVED_CONST_INT-1])
1451 extern rtx const_true_rtx;
1452
1453 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1454
1455 /* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
1456    same as VOIDmode.  */
1457
1458 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1459
1460 /* Likewise, for the constants 1 and 2.  */
1461
1462 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1463 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1464
1465 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1466    is used to represent the frame pointer.  This is because the
1467    hard frame pointer and the automatic variables are separated by an amount
1468    that cannot be determined until after register allocation.  We can assume
1469    that in this case ELIMINABLE_REGS will be defined, one action of which
1470    will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1471 #ifndef HARD_FRAME_POINTER_REGNUM
1472 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1473 #endif
1474
1475 /* Index labels for global_rtl.  */
1476 enum global_rtl_index
1477 {
1478   GR_PC,
1479   GR_CC0,
1480   GR_STACK_POINTER,
1481   GR_FRAME_POINTER,
1482 /* For register elimination to work properly these hard_frame_pointer_rtx,
1483    frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1484    the same register.  */
1485 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1486   GR_ARG_POINTER = GR_FRAME_POINTER,
1487 #endif
1488 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1489   GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1490 #else
1491   GR_HARD_FRAME_POINTER,
1492 #endif
1493 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1494 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1495   GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1496 #else
1497   GR_ARG_POINTER,
1498 #endif
1499 #endif
1500   GR_VIRTUAL_INCOMING_ARGS,
1501   GR_VIRTUAL_STACK_ARGS,
1502   GR_VIRTUAL_STACK_DYNAMIC,
1503   GR_VIRTUAL_OUTGOING_ARGS,
1504   GR_VIRTUAL_CFA,
1505
1506   GR_MAX
1507 };
1508
1509 /* Pointers to standard pieces of rtx are stored here.  */
1510 extern rtx global_rtl[GR_MAX];
1511
1512 /* Standard pieces of rtx, to be substituted directly into things.  */
1513 #define pc_rtx                  (global_rtl[GR_PC])
1514 #define cc0_rtx                 (global_rtl[GR_CC0])
1515
1516 /* All references to certain hard regs, except those created
1517    by allocating pseudo regs into them (when that's possible),
1518    go through these unique rtx objects.  */
1519 #define stack_pointer_rtx       (global_rtl[GR_STACK_POINTER])
1520 #define frame_pointer_rtx       (global_rtl[GR_FRAME_POINTER])
1521 #define hard_frame_pointer_rtx  (global_rtl[GR_HARD_FRAME_POINTER])
1522 #define arg_pointer_rtx         (global_rtl[GR_ARG_POINTER])
1523
1524 extern rtx pic_offset_table_rtx;
1525 extern rtx struct_value_rtx;
1526 extern rtx struct_value_incoming_rtx;
1527 extern rtx static_chain_rtx;
1528 extern rtx static_chain_incoming_rtx;
1529 extern rtx return_address_pointer_rtx;
1530
1531 /* Include the RTL generation functions.  */
1532
1533 #ifndef NO_GENRTL_H
1534 #include "genrtl.h"
1535 #endif
1536
1537 /* There are some RTL codes that require special attention; the
1538    generation functions included above do the raw handling.  If you
1539    add to this list, modify special_rtx in gengenrtl.c as well.  You
1540    should also modify gen_rtx to use the special function.  */
1541
1542 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1543                                        HOST_WIDE_INT, HOST_WIDE_INT));
1544 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1545 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1546 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1547 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1548 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1549
1550 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1551
1552 /* We need the cast here to ensure that we get the same result both with
1553    and without prototypes.  */
1554 #define GEN_INT(N)  gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1555
1556 /* Virtual registers are used during RTL generation to refer to locations into
1557    the stack frame when the actual location isn't known until RTL generation
1558    is complete.  The routine instantiate_virtual_regs replaces these with
1559    the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1560    a constant.  */
1561
1562 #define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
1563
1564 /* This points to the first word of the incoming arguments passed on the stack,
1565    either by the caller or by the callee when pretending it was passed by the
1566    caller.  */
1567
1568 #define virtual_incoming_args_rtx       (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1569
1570 #define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
1571
1572 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1573    variable on the stack.  Otherwise, it points to the first variable on
1574    the stack.  */
1575
1576 #define virtual_stack_vars_rtx          (global_rtl[GR_VIRTUAL_STACK_ARGS])
1577
1578 #define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
1579
1580 /* This points to the location of dynamically-allocated memory on the stack
1581    immediately after the stack pointer has been adjusted by the amount
1582    desired.  */
1583
1584 #define virtual_stack_dynamic_rtx       (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1585
1586 #define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
1587
1588 /* This points to the location in the stack at which outgoing arguments should
1589    be written when the stack is pre-pushed (arguments pushed using push
1590    insns always use sp).  */
1591
1592 #define virtual_outgoing_args_rtx       (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1593
1594 #define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
1595
1596 /* This points to the Canonical Frame Address of the function.  This
1597    should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1598    but is calculated relative to the arg pointer for simplicity; the
1599    frame pointer nor stack pointer are necessarily fixed relative to
1600    the CFA until after reload.  */
1601
1602 #define virtual_cfa_rtx                 (global_rtl[GR_VIRTUAL_CFA])
1603
1604 #define VIRTUAL_CFA_REGNUM              ((FIRST_VIRTUAL_REGISTER) + 4)
1605
1606 #define LAST_VIRTUAL_REGISTER           ((FIRST_VIRTUAL_REGISTER) + 4)
1607
1608 /* REGNUM never really appearing in the INSN stream.  */
1609 #define INVALID_REGNUM                  (~(unsigned int)0)
1610
1611 extern rtx find_next_ref                PARAMS ((rtx, rtx));
1612
1613 extern rtx output_constant_def          PARAMS ((union tree_node *, int));
1614 extern rtx immed_real_const             PARAMS ((union tree_node *));
1615
1616 /* Define a default value for STORE_FLAG_VALUE.  */
1617
1618 #ifndef STORE_FLAG_VALUE
1619 #define STORE_FLAG_VALUE 1
1620 #endif
1621
1622 /* Nonzero after the second flow pass has completed.
1623    Set to 1 or 0 by toplev.c  */
1624 extern int flow2_completed;
1625
1626 /* Nonzero after end of reload pass.
1627    Set to 1 or 0 by reload1.c.  */
1628
1629 extern int reload_completed;
1630
1631 /* Set to 1 while reload_as_needed is operating.
1632    Required by some machines to handle any generated moves differently.  */
1633
1634 extern int reload_in_progress;
1635
1636 /* If this is nonzero, we do not bother generating VOLATILE
1637    around volatile memory references, and we are willing to
1638    output indirect addresses.  If cse is to follow, we reject
1639    indirect addresses so a useful potential cse is generated;
1640    if it is used only once, instruction combination will produce
1641    the same indirect address eventually.  */
1642 extern int cse_not_expected;
1643
1644 /* Set to nonzero before life analysis to indicate that it is unsafe to
1645    generate any new pseudo registers.  */
1646 extern int no_new_pseudos;
1647
1648 /* Translates rtx code to tree code, for those codes needed by
1649    REAL_ARITHMETIC.  The function returns an int because the caller may not
1650    know what `enum tree_code' means.  */
1651
1652 extern int rtx_to_tree_code     PARAMS ((enum rtx_code));
1653
1654 /* In tree.c */
1655 struct obstack;
1656 extern void gcc_obstack_init            PARAMS ((struct obstack *));
1657
1658 /* In cse.c */
1659 struct cse_basic_block_data;
1660
1661 /* Return the right cost to give to an operation
1662    to make the cost of the corresponding register-to-register instruction
1663    N times that of a fast register-to-register instruction.  */
1664 #define COSTS_N_INSNS(N) ((N) * 4)
1665
1666 /* Maximum cost of a rtl expression.  This value has the special meaning
1667    not to use an rtx with this cost under any circumstances.  */
1668 #define MAX_COST INT_MAX
1669
1670 extern int rtx_cost                     PARAMS ((rtx, enum rtx_code));
1671 extern int address_cost                 PARAMS ((rtx, enum machine_mode));
1672 extern void delete_trivially_dead_insns PARAMS ((rtx, int));
1673 #ifdef BUFSIZ
1674 extern int cse_main                     PARAMS ((rtx, int, int, FILE *));
1675 #endif
1676 extern void cse_end_of_basic_block      PARAMS ((rtx,
1677                                                 struct cse_basic_block_data *,
1678                                                 int, int, int));
1679
1680 /* In jump.c */
1681 extern int comparison_dominates_p       PARAMS ((enum rtx_code, enum rtx_code));
1682 extern int condjump_p                   PARAMS ((rtx));
1683 extern int any_condjump_p               PARAMS ((rtx));
1684 extern int any_uncondjump_p             PARAMS ((rtx));
1685 extern int safe_to_remove_jump_p        PARAMS ((rtx));
1686 extern rtx pc_set                       PARAMS ((rtx));
1687 extern rtx condjump_label               PARAMS ((rtx));
1688 extern int simplejump_p                 PARAMS ((rtx));
1689 extern int returnjump_p                 PARAMS ((rtx));
1690 extern int onlyjump_p                   PARAMS ((rtx));
1691 extern int sets_cc0_p                   PARAMS ((rtx));
1692 extern int invert_jump_1                PARAMS ((rtx, rtx));
1693 extern int invert_jump                  PARAMS ((rtx, rtx, int));
1694 extern int rtx_renumbered_equal_p       PARAMS ((rtx, rtx));
1695 extern int true_regnum                  PARAMS ((rtx));
1696 extern int redirect_jump_1              PARAMS ((rtx, rtx));
1697 extern int redirect_jump                PARAMS ((rtx, rtx, int));
1698 extern void jump_optimize               PARAMS ((rtx, int, int, int));
1699 extern void jump_optimize_minimal       PARAMS ((rtx));
1700 extern void rebuild_jump_labels         PARAMS ((rtx));
1701 extern void thread_jumps                PARAMS ((rtx, int, int));
1702 extern int rtx_equal_for_thread_p       PARAMS ((rtx, rtx, rtx));
1703 extern int can_reverse_comparison_p     PARAMS ((rtx, rtx));
1704 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1705 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1706                                                              rtx, rtx, rtx));
1707 extern void delete_for_peephole         PARAMS ((rtx, rtx));
1708 extern int condjump_in_parallel_p       PARAMS ((rtx));
1709 extern void never_reached_warning       PARAMS ((rtx));
1710
1711 /* Flags for jump_optimize() */
1712 #define JUMP_CROSS_JUMP                 1
1713 #define JUMP_CROSS_JUMP_DEATH_MATTERS   2
1714 #define JUMP_NOOP_MOVES                 1
1715 #define JUMP_AFTER_REGSCAN              1
1716
1717 /* In emit-rtl.c. */
1718 extern int max_reg_num                          PARAMS ((void));
1719 extern int max_label_num                        PARAMS ((void));
1720 extern int get_first_label_num                  PARAMS ((void));
1721 extern void delete_insns_since                  PARAMS ((rtx));
1722 extern void mark_reg_pointer                    PARAMS ((rtx, int));
1723 extern void mark_user_reg                       PARAMS ((rtx));
1724 extern void reset_used_flags                    PARAMS ((rtx));
1725 extern void reorder_insns                       PARAMS ((rtx, rtx, rtx));
1726 extern int get_max_uid                          PARAMS ((void));
1727 extern int in_sequence_p                        PARAMS ((void));
1728 extern void force_next_line_note                PARAMS ((void));
1729 extern void clear_emit_caches                   PARAMS ((void));
1730 extern void init_emit                           PARAMS ((void));
1731 extern void init_emit_once                      PARAMS ((int));
1732 extern void push_topmost_sequence               PARAMS ((void));
1733 extern void pop_topmost_sequence                PARAMS ((void));
1734 extern int subreg_realpart_p                    PARAMS ((rtx));
1735 extern void reverse_comparison                  PARAMS ((rtx));
1736 extern void set_new_first_and_last_insn         PARAMS ((rtx, rtx));
1737 extern void set_new_first_and_last_label_num    PARAMS ((int, int));
1738 extern void set_new_last_label_num              PARAMS ((int));
1739 extern void unshare_all_rtl_again               PARAMS ((rtx));
1740 extern void set_last_insn                       PARAMS ((rtx));
1741 extern void link_cc0_insns                      PARAMS ((rtx));
1742 extern void add_insn                            PARAMS ((rtx));
1743 extern void add_insn_before                     PARAMS ((rtx, rtx));
1744 extern void add_insn_after                      PARAMS ((rtx, rtx));
1745 extern void remove_insn                         PARAMS ((rtx));
1746 extern void reorder_insns_with_line_notes       PARAMS ((rtx, rtx, rtx));
1747 extern void emit_insn_after_with_line_notes     PARAMS ((rtx, rtx, rtx));
1748 extern enum rtx_code classify_insn              PARAMS ((rtx));
1749 extern rtx emit                                 PARAMS ((rtx));
1750 /* Query and clear/ restore no_line_numbers.  This is used by the
1751    switch / case handling in stmt.c to give proper line numbers in
1752    warnings about unreachable code.  */
1753 int force_line_numbers PARAMS ((void));
1754 void restore_line_number_status PARAMS ((int old_value));
1755 extern void renumber_insns                      PARAMS ((FILE *));
1756 extern void remove_unnecessary_notes             PARAMS ((void));
1757
1758 /* In combine.c */
1759 extern int combine_instructions         PARAMS ((rtx, unsigned int));
1760 extern unsigned int extended_count      PARAMS ((rtx, enum machine_mode, int));
1761 extern rtx remove_death                 PARAMS ((unsigned int, rtx));
1762 #ifdef BUFSIZ
1763 extern void dump_combine_stats          PARAMS ((FILE *));
1764 extern void dump_combine_total_stats    PARAMS ((FILE *));
1765 #endif
1766
1767 /* In sched.c. */
1768 #ifdef BUFSIZ
1769 extern void schedule_insns              PARAMS ((FILE *));
1770 extern void schedule_ebbs               PARAMS ((FILE *));
1771 #endif
1772 extern void fix_sched_param             PARAMS ((const char *, const char *));
1773
1774 /* In print-rtl.c */
1775 extern const char *print_rtx_head;
1776 extern void debug_rtx                   PARAMS ((rtx));
1777 extern void debug_rtx_list              PARAMS ((rtx, int));
1778 extern void debug_rtx_range             PARAMS ((rtx, rtx));
1779 extern rtx debug_rtx_find               PARAMS ((rtx, int));
1780 #ifdef BUFSIZ
1781 extern void print_rtl                   PARAMS ((FILE *, rtx));
1782 extern void print_simple_rtl            PARAMS ((FILE *, rtx));
1783 extern int print_rtl_single             PARAMS ((FILE *, rtx));
1784 extern void print_inline_rtx            PARAMS ((FILE *, rtx, int));
1785 #endif
1786
1787 /* In loop.c */
1788 extern void init_loop                   PARAMS ((void));
1789 extern rtx libcall_other_reg            PARAMS ((rtx, rtx));
1790 #ifdef BUFSIZ
1791 extern void loop_optimize               PARAMS ((rtx, FILE *, int));
1792 #endif
1793 extern void record_excess_regs          PARAMS ((rtx, rtx, rtx *));
1794
1795 /* In function.c */
1796 extern void reposition_prologue_and_epilogue_notes      PARAMS ((rtx));
1797 extern void thread_prologue_and_epilogue_insns          PARAMS ((rtx));
1798 extern int prologue_epilogue_contains                   PARAMS ((rtx));
1799 extern int sibcall_epilogue_contains                    PARAMS ((rtx));
1800 extern void preserve_rtl_expr_result                    PARAMS ((rtx));
1801 extern void mark_temp_addr_taken                        PARAMS ((rtx));
1802 extern void update_temp_slot_address                    PARAMS ((rtx, rtx));
1803 extern void purge_addressof                             PARAMS ((rtx));
1804 extern void purge_hard_subreg_sets                      PARAMS ((rtx));
1805
1806 /* In reload.c */
1807 extern int operands_match_p             PARAMS ((rtx, rtx));
1808 extern int safe_from_earlyclobber       PARAMS ((rtx, rtx));
1809
1810 /* In stmt.c */
1811 extern void set_file_and_line_for_stmt  PARAMS ((const char *, int));
1812 extern void expand_null_return          PARAMS ((void));
1813 extern void emit_jump                   PARAMS ((rtx));
1814 extern int preserve_subexpressions_p    PARAMS ((void));
1815
1816 /* In expr.c */
1817 extern void move_by_pieces              PARAMS ((rtx, rtx,
1818                                                  unsigned HOST_WIDE_INT,
1819                                                  unsigned int));
1820
1821 /* In flow.c */
1822 extern void recompute_reg_usage         PARAMS ((rtx, int));
1823 #ifdef BUFSIZ
1824 extern void print_rtl_with_bb           PARAMS ((FILE *, rtx));
1825 extern void dump_flow_info              PARAMS ((FILE *));
1826 #endif
1827
1828 /* In expmed.c */
1829 extern void init_expmed                 PARAMS ((void));
1830 extern void expand_inc                  PARAMS ((rtx, rtx));
1831 extern void expand_dec                  PARAMS ((rtx, rtx));
1832 extern rtx expand_mult_highpart         PARAMS ((enum machine_mode, rtx,
1833                                                 unsigned HOST_WIDE_INT, rtx,
1834                                                 int, int));
1835
1836 /* In gcse.c */
1837 #ifdef BUFSIZ
1838 extern int gcse_main                    PARAMS ((rtx, FILE *));
1839 #endif
1840
1841 /* In global.c */
1842 extern void mark_elimination            PARAMS ((int, int));
1843 #ifdef BUFSIZ
1844 extern int global_alloc                 PARAMS ((FILE *));
1845 extern void dump_global_regs            PARAMS ((FILE *));
1846 #endif
1847 #ifdef HARD_CONST
1848 extern void retry_global_alloc          PARAMS ((int, HARD_REG_SET));
1849 #endif
1850 extern void build_insn_chain            PARAMS ((rtx));
1851
1852 /* In regclass.c */
1853 extern int reg_classes_intersect_p      PARAMS ((enum reg_class, enum reg_class));
1854 extern int reg_class_subset_p           PARAMS ((enum reg_class, enum reg_class));
1855 extern void globalize_reg               PARAMS ((int));
1856 extern void init_regs                   PARAMS ((void));
1857 extern void init_reg_sets               PARAMS ((void));
1858 extern void regset_release_memory       PARAMS ((void));
1859 extern void regclass_init               PARAMS ((void));
1860 extern void regclass                    PARAMS ((rtx, int, FILE *));
1861 extern void reg_scan                    PARAMS ((rtx, unsigned int, int));
1862 extern void reg_scan_update             PARAMS ((rtx, rtx, unsigned int));
1863 extern void fix_register                PARAMS ((const char *, int, int));
1864
1865 extern void delete_null_pointer_checks  PARAMS ((rtx));
1866
1867 /* In regmove.c */
1868 #ifdef BUFSIZ
1869 extern void regmove_optimize            PARAMS ((rtx, int, FILE *));
1870 #endif
1871 extern void combine_stack_adjustments   PARAMS ((void));
1872
1873 /* In reorg.c */
1874 #ifdef BUFSIZ
1875 extern void dbr_schedule                PARAMS ((rtx, FILE *));
1876 #endif
1877
1878 /* In local-alloc.c */
1879 #ifdef BUFSIZ
1880 extern void dump_local_alloc            PARAMS ((FILE *));
1881 #endif
1882 extern int local_alloc                  PARAMS ((void));
1883 extern int function_invariant_p         PARAMS ((rtx));
1884
1885 /* In reload1.c */
1886 extern void reload_cse_regs             PARAMS ((rtx));
1887 extern void init_reload                 PARAMS ((void));
1888 extern void mark_home_live              PARAMS ((int));
1889 extern int reload                       PARAMS ((rtx, int));
1890
1891 /* In caller-save.c */
1892 extern void init_caller_save            PARAMS ((void));
1893
1894 /* In profile.c */
1895 extern void init_branch_prob            PARAMS ((const char *));
1896 extern void branch_prob                 PARAMS ((void));
1897 extern void end_branch_prob             PARAMS ((void));
1898 extern void output_func_start_profiler  PARAMS ((void));
1899
1900 /* In reg-stack.c */
1901 #ifdef BUFSIZ
1902 extern void reg_to_stack                PARAMS ((rtx, FILE *));
1903 #endif
1904
1905 /* In fold-const.c */
1906 extern int add_double           PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1907                                          unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1908                                          unsigned HOST_WIDE_INT *,
1909                                          HOST_WIDE_INT *));
1910 extern int neg_double           PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1911                                          unsigned HOST_WIDE_INT *,
1912                                          HOST_WIDE_INT *));
1913 extern int mul_double           PARAMS ((unsigned HOST_WIDE_INT,
1914                                          HOST_WIDE_INT,
1915                                          unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1916                                          unsigned HOST_WIDE_INT *,
1917                                          HOST_WIDE_INT *));
1918 extern void lshift_double       PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1919                                          HOST_WIDE_INT, unsigned int,
1920                                          unsigned HOST_WIDE_INT *,
1921                                          HOST_WIDE_INT *, int));
1922 extern void rshift_double       PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1923                                          HOST_WIDE_INT, unsigned int,
1924                                          unsigned HOST_WIDE_INT *,
1925                                          HOST_WIDE_INT *, int));
1926 extern void lrotate_double      PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1927                                          HOST_WIDE_INT, unsigned int,
1928                                          unsigned HOST_WIDE_INT *,
1929                                          HOST_WIDE_INT *));
1930 extern void rrotate_double      PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1931                                          HOST_WIDE_INT, unsigned int,
1932                                          unsigned HOST_WIDE_INT *,
1933                                          HOST_WIDE_INT *));
1934
1935 /* In calls.c */
1936 enum libcall_type
1937 {
1938   LCT_NORMAL = 0,
1939   LCT_CONST = 1,
1940   LCT_PURE = 2,
1941   LCT_CONST_MAKE_BLOCK = 3,
1942   LCT_PURE_MAKE_BLOCK = 4,
1943   LCT_NORETURN = 5,
1944   LCT_THROW = 6
1945 };
1946
1947 extern void emit_library_call           PARAMS ((rtx, enum libcall_type,
1948                                                  enum machine_mode, int,
1949                                                  ...));
1950 extern rtx emit_library_call_value      PARAMS ((rtx, rtx, enum libcall_type,
1951                                                  enum machine_mode, int,
1952                                                  ...));
1953
1954 /* In unroll.c */
1955 extern int set_dominates_use            PARAMS ((int, int, int, rtx, rtx));
1956
1957 /* In varasm.c */
1958 extern void bss_section                 PARAMS ((void));
1959 extern int in_data_section              PARAMS ((void));
1960 extern void init_varasm_once            PARAMS ((void));
1961
1962 /* In rtl.c */
1963 extern void init_rtl                    PARAMS ((void));
1964 extern void traverse_md_constants       PARAMS ((int (*) (void **, void *),
1965                                                  void *));
1966 struct md_constant { char *name, *value; };
1967
1968 #ifdef BUFSIZ
1969 extern int read_skip_spaces             PARAMS ((FILE *));
1970 extern rtx read_rtx                     PARAMS ((FILE *));
1971 #endif
1972
1973 extern const char *read_rtx_filename;
1974 extern int read_rtx_lineno;
1975
1976 /* Redefine abort to report an internal error w/o coredump, and
1977    reporting the location of the error in the source file.  This logic
1978    is duplicated in rtl.h and tree.h because every file that needs the
1979    special abort includes one or both.  toplev.h gets too few files,
1980    system.h gets too many.  */
1981
1982 extern void fancy_abort PARAMS ((const char *, int, const char *))
1983     ATTRIBUTE_NORETURN;
1984 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
1985
1986 /* In alias.c */
1987 extern rtx canon_rtx                    PARAMS ((rtx));
1988 extern int true_dependence              PARAMS ((rtx, enum machine_mode, rtx,
1989                                                 int (*)(rtx, int)));
1990 extern rtx get_addr                     PARAMS ((rtx));
1991 extern int canon_true_dependence        PARAMS ((rtx, enum machine_mode, rtx,
1992                                                 rtx, int (*)(rtx, int)));
1993 extern int read_dependence              PARAMS ((rtx, rtx));
1994 extern int anti_dependence              PARAMS ((rtx, rtx));
1995 extern int output_dependence            PARAMS ((rtx, rtx));
1996 extern void mark_constant_function      PARAMS ((void));
1997 extern void init_alias_once             PARAMS ((void));
1998 extern void init_alias_analysis         PARAMS ((void));
1999 extern void end_alias_analysis          PARAMS ((void));
2000 extern rtx addr_side_effect_eval        PARAMS ((rtx, int, int));
2001
2002 /* In sibcall.c */
2003 typedef enum {
2004   sibcall_use_normal = 1,
2005   sibcall_use_tail_recursion,
2006   sibcall_use_sibcall
2007 } sibcall_use_t;
2008
2009 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2010 extern void replace_call_placeholder    PARAMS ((rtx, sibcall_use_t));
2011
2012 #ifdef STACK_REGS
2013 extern int stack_regs_mentioned         PARAMS ((rtx insn));
2014 #endif
2015
2016 /* In toplev.c */
2017 extern rtx stack_limit_rtx;
2018
2019 /* In regrename.c */
2020 extern void regrename_optimize          PARAMS ((void));
2021
2022 /* In condexec.c */
2023 extern void if_convert                  PARAMS ((int));
2024
2025 #endif /* _RTL_H */