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 GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_RTL_H
  23 #define GCC_RTL_H
  24
  25 struct function;
  26
  27 #include "machmode.h"
  28
  29 #undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
  30 #undef FLOAT /* Likewise.  */
  31 #undef ABS /* Likewise.  */
  32 #undef PC /* Likewise.  */
  33
  34 /* Value used by some passes to "recognize" noop moves as valid instructions.
  35  */
  36 #define NOOP_MOVE_INSN_CODE     INT_MAX
  37
  38 /* Register Transfer Language EXPRESSIONS CODES */
  39
  40 #define RTX_CODE        enum rtx_code
  41 enum rtx_code  {
  42
  43 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
  44 #include "rtl.def"              /* rtl expressions are documented here */
  45 #undef DEF_RTL_EXPR
  46
  47   LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
  48                                    NUM_RTX_CODE.
  49                                    Assumes default enum value assignment.  */
  50
  51 #define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
  52                                 /* The cast here, saves many elsewhere.  */
  53
  54 extern const 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   rtx rtx;
  93   rtvec 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   tree rttree;
  99   struct basic_block_def *bb;
 100 } rtunion;
 101
 102 /* RTL expression ("rtx").  */
 103
 104 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   unsigned int jump : 1;
 115   /* 1 in an INSN if it can call another function.  */
 116   unsigned int call : 1;
 117   /* 1 in a REG if value of this expression will never change during
 118      the current function, even though it is not manifestly constant.
 119      1 in a MEM if contents of memory are constant.  This does not
 120      necessarily mean that the value of this expression is constant.
 121      1 in a SUBREG if it is from a promoted variable that is unsigned.
 122      1 in a SYMBOL_REF if it addresses something in the per-function
 123      constants pool.
 124      1 in a CALL_INSN if it is a const call.
 125      1 in a JUMP_INSN if it is a branch that should be annulled.  Valid from
 126      reorg until end of compilation; cleared before used.  */
 127   unsigned int unchanging : 1;
 128   /* 1 in a MEM expression if contents of memory are volatile.
 129      1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
 130      if it is deleted.
 131      1 in a REG expression if corresponds to a variable declared by the user.
 132      0 for an internally generated temporary.
 133      In a SYMBOL_REF, this flag is used for machine-specific purposes.
 134      In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P.  */
 135   unsigned int volatil : 1;
 136   /* 1 in a MEM referring to a field of an aggregate.
 137      0 if the MEM was a variable or the result of a * operator in C;
 138      1 if it was the result of a . or -> operator (on a struct) in C.
 139      1 in a REG if the register is used only in exit code a loop.
 140      1 in a SUBREG expression if was generated from a variable with a
 141      promoted mode.
 142      1 in a CODE_LABEL if the label is used for nonlocal gotos
 143      and must not be deleted even if its count is zero.
 144      1 in a LABEL_REF if this is a reference to a label outside the
 145      current loop.
 146      1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
 147      together with the preceding insn.  Valid only within sched.
 148      1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
 149      from the target of a branch.  Valid from reorg until end of compilation;
 150      cleared before used.
 151      1 in an INSN if this insn is dead code.  Valid only during
 152      dead-code elimination phase; cleared before use. */
 153   unsigned int in_struct : 1;
 154   /* 1 if this rtx is used.  This is used for copying shared structure.
 155      See `unshare_all_rtl'.
 156      In a REG, this is not needed for that purpose, and used instead
 157      in `leaf_renumber_regs_insn'.
 158      In a SYMBOL_REF, means that emit_library_call
 159      has used it as the function.  */
 160   unsigned int used : 1;
 161   /* Nonzero if this rtx came from procedure integration.
 162      In a REG, nonzero means this reg refers to the return value
 163      of the current function.
 164      1 in a SYMBOL_REF if the symbol is weak.  */
 165   unsigned integrated : 1;
 166   /* 1 in an INSN or a SET if this rtx is related to the call frame,
 167      either changing how we compute the frame address or saving and
 168      restoring registers in the prologue and epilogue.
 169      1 in a MEM if the MEM refers to a scalar, rather than a member of
 170      an aggregate.
 171      1 in a REG if the register is a pointer.
 172      1 in a SYMBOL_REF if it addresses something in the per-function
 173      constant string pool.  */
 174   unsigned frame_related : 1;
 175
 176   /* The first element of the operands of this rtx.
 177      The number of operands and their types are controlled
 178      by the `code' field, according to rtl.def.  */
 179   rtunion fld[1];
 180 };
 181
 182 #define NULL_RTX (rtx) 0
 183
 184 /* Define macros to access the `code' field of the rtx.  */
 185
 186 #define GET_CODE(RTX)       ((enum rtx_code) (RTX)->code)
 187 #define PUT_CODE(RTX, CODE) ((RTX)->code = (ENUM_BITFIELD(rtx_code)) (CODE))
 188
 189 #define GET_MODE(RTX)       ((enum machine_mode) (RTX)->mode)
 190 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (ENUM_BITFIELD(machine_mode)) (MODE))
 191
 192 #define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
 193 #define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
 194 #define RTX_FRAME_RELATED_P(RTX) ((RTX)->frame_related)
 195
 196 /* RTL vector.  These appear inside RTX's when there is a need
 197    for a variable number of things.  The principle use is inside
 198    PARALLEL expressions.  */
 199
 200 struct rtvec_def {
 201   int num_elem;         /* number of elements */
 202   rtx elem[1];
 203 };
 204
 205 #define NULL_RTVEC (rtvec) 0
 206
 207 #define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
 208 #define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (NUM))
 209
 210 /* Predicate yielding nonzero iff X is an rtl for a register.  */
 211 #define REG_P(X) (GET_CODE (X) == REG)
 212
 213 /* Predicate yielding nonzero iff X is a label insn.  */
 214 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
 215
 216 /* Predicate yielding nonzero iff X is a jump insn.  */
 217 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
 218
 219 /* Predicate yielding nonzero iff X is a note insn.  */
 220 #define NOTE_P(X) (GET_CODE (X) == NOTE)
 221
 222 /* Predicate yielding nonzero iff X is a barrier insn.  */
 223 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
 224
 225 /* Predicate yielding nonzero iff X is a data for a jump table.  */
 226 #define JUMP_TABLE_DATA_P(INSN) \
 227   (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
 228                      GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
 229
 230 /* 1 if X is a constant value that is an integer.  */
 231
 232 #define CONSTANT_P(X)   \
 233   (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF              \
 234    || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE         \
 235    || GET_CODE (X) == CONST || GET_CODE (X) == HIGH                     \
 236    || GET_CODE (X) == CONSTANT_P_RTX)
 237
 238 /* General accessor macros for accessing the fields of an rtx.  */
 239
 240 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 241 /* The bit with a star outside the statement expr and an & inside is
 242    so that N can be evaluated only once.  */
 243 #define RTL_CHECK1(RTX, N, C1) __extension__                            \
 244 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 245      enum rtx_code _code = GET_CODE (_rtx);                             \
 246      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 247        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
 248      if (GET_RTX_FORMAT(_code)[_n] != C1)                               \
 249        rtl_check_failed_type1(_rtx, _n, C1, __FILE__, __LINE__, __FUNCTION__); \
 250      &_rtx->fld[_n]; }))
 251
 252 #define RTL_CHECK2(RTX, N, C1, C2) __extension__                        \
 253 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 254      enum rtx_code _code = GET_CODE (_rtx);                             \
 255      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 256        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__, __FUNCTION__); \
 257      if (GET_RTX_FORMAT(_code)[_n] != C1                                \
 258          && GET_RTX_FORMAT(_code)[_n] != C2)                            \
 259        rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__,    \
 260                                __FUNCTION__);                           \
 261      &_rtx->fld[_n]; }))
 262
 263 #define RTL_CHECKC1(RTX, N, C) __extension__                            \
 264 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 265      if (GET_CODE (_rtx) != C)                                          \
 266        rtl_check_failed_code1 (_rtx, C, __FILE__, __LINE__, __FUNCTION__); \
 267      &_rtx->fld[_n]; }))
 268
 269 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__                       \
 270 (*({ rtx _rtx = (RTX); int _n = (N);                                    \
 271      enum rtx_code _code = GET_CODE (_rtx);                             \
 272      if (_code != C1 && _code != C2)                                    \
 273        rtl_check_failed_code2(_rtx, C1, C2, __FILE__, __LINE__, __FUNCTION__); \
 274      &_rtx->fld[_n]; }))
 275
 276 #define RTVEC_ELT(RTVEC, I) __extension__                               \
 277 (*({ rtvec _rtvec = (RTVEC); int _i = (I);                              \
 278      if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec))                         \
 279        rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__,       \
 280                                   __FUNCTION__);                        \
 281      &_rtvec->elem[_i]; }))
 282
 283 extern void rtl_check_failed_bounds PARAMS ((rtx, int,
 284                                            const char *, int, const char *))
 285     ATTRIBUTE_NORETURN;
 286 extern void rtl_check_failed_type1 PARAMS ((rtx, int, int,
 287                                           const char *, int, const char *))
 288     ATTRIBUTE_NORETURN;
 289 extern void rtl_check_failed_type2 PARAMS ((rtx, int, int, int,
 290                                           const char *, int, const char *))
 291     ATTRIBUTE_NORETURN;
 292 extern void rtl_check_failed_code1 PARAMS ((rtx, enum rtx_code,
 293                                           const char *, int, const char *))
 294     ATTRIBUTE_NORETURN;
 295 extern void rtl_check_failed_code2 PARAMS ((rtx, enum rtx_code, enum rtx_code,
 296                                           const char *, int, const char *))
 297     ATTRIBUTE_NORETURN;
 298 extern void rtvec_check_failed_bounds PARAMS ((rtvec, int,
 299                                              const char *, int, const char *))
 300     ATTRIBUTE_NORETURN;
 301
 302 #else   /* not ENABLE_RTL_CHECKING */
 303
 304 #define RTL_CHECK1(RTX, N, C1)      ((RTX)->fld[N])
 305 #define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->fld[N])
 306 #define RTL_CHECKC1(RTX, N, C)      ((RTX)->fld[N])
 307 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->fld[N])
 308 #define RTVEC_ELT(RTVEC, I)         ((RTVEC)->elem[I])
 309
 310 #endif
 311
 312 #define XWINT(RTX, N)   (RTL_CHECK1(RTX, N, 'w').rtwint)
 313 #define XINT(RTX, N)    (RTL_CHECK2(RTX, N, 'i', 'n').rtint)
 314 #define XSTR(RTX, N)    (RTL_CHECK2(RTX, N, 's', 'S').rtstr)
 315 #define XEXP(RTX, N)    (RTL_CHECK2(RTX, N, 'e', 'u').rtx)
 316 #define XVEC(RTX, N)    (RTL_CHECK2(RTX, N, 'E', 'V').rtvec)
 317 #define XMODE(RTX, N)   (RTL_CHECK1(RTX, N, 'M').rttype)
 318 #define XBITMAP(RTX, N) (RTL_CHECK1(RTX, N, 'b').rtbit)
 319 #define XTREE(RTX, N)   (RTL_CHECK1(RTX, N, 't').rttree)
 320 #define XBBDEF(RTX, N)  (RTL_CHECK1(RTX, N, 'B').bb)
 321 #define XTMPL(RTX, N)   (RTL_CHECK1(RTX, N, 'T').rtstr)
 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 or pure function.  */
 391 #define CONST_OR_PURE_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.
 500      It has an integer value.  For jumps, it is the probability that this is a
 501      taken branch.  For calls, it is the probability that this call won't
 502      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   /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs.  It contains
 519      CONCAT of two integer value.  First specifies the branch predictor
 520      that added the note, second specifies the predicted hitrate of branch
 521      in the same format as REG_BR_PROB note uses.  */
 522   REG_BR_PRED,
 523
 524   /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
 525      for DWARF to interpret what they imply.  The attached rtx is used
 526      instead of intuition.  */
 527   REG_FRAME_RELATED_EXPR,
 528
 529   /* Indicates that REG holds the exception context for the function.
 530      This context is shared by inline functions, so the code to acquire
 531      the real exception context is delayed until after inlining.  */
 532   REG_EH_CONTEXT,
 533
 534   /* Indicates what exception region an INSN belongs in.  This is used to
 535      indicate what region to which a call may throw.  REGION 0 indicates
 536      that a call cannot throw at all.  REGION -1 indicates that it cannot
 537      throw, nor will it execute a non-local goto.  */
 538   REG_EH_REGION,
 539
 540   /* Used by haifa-sched to save NOTE_INSN notes across scheduling.  */
 541   REG_SAVE_NOTE,
 542
 543   /* Indicates that this insn (which is part of the prologue) computes
 544      a value which might not be used later, and if so it's OK to delete
 545      the insn.  Normally, deleting any insn in the prologue is an error.
 546      At present the parameter is unused and set to (const_int 0).  */
 547   REG_MAYBE_DEAD,
 548
 549   /* Indicates that a call does not return.  */
 550   REG_NORETURN,
 551
 552   /* Indicates that an indirect jump is a non-local goto instead of a
 553      computed goto.  */
 554   REG_NON_LOCAL_GOTO,
 555
 556   /* This kind of note is generated at each to `setjmp',
 557      and similar functions that can return twice.  */
 558   REG_SETJMP,
 559
 560   /* Indicate calls that always returns.  */
 561   REG_ALWAYS_RETURN
 562 };
 563
 564 /* The base value for branch probability notes.  */
 565 #define REG_BR_PROB_BASE  10000
 566
 567 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
 568 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
 569 #define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
 570
 571 /* Names for REG_NOTE's in EXPR_LIST insn's.  */
 572
 573 extern const char * const reg_note_name[];
 574 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
 575
 576 /* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
 577    USE and CLOBBER expressions.
 578      USE expressions list the registers filled with arguments that
 579    are passed to the function.
 580      CLOBBER expressions document the registers explicitly clobbered
 581    by this CALL_INSN.
 582      Pseudo registers can not be mentioned in this list.  */
 583 #define CALL_INSN_FUNCTION_USAGE(INSN)  XEXP(INSN, 7)
 584
 585 /* The label-number of a code-label.  The assembler label
 586    is made from `L' and the label-number printed in decimal.
 587    Label numbers are unique in a compilation.  */
 588 #define CODE_LABEL_NUMBER(INSN) XINT(INSN, 5)
 589
 590 #define LINE_NUMBER NOTE
 591
 592 /* In a NOTE that is a line number, this is a string for the file name that the
 593    line is in.  We use the same field to record block numbers temporarily in
 594    NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.  (We avoid lots of casts
 595    between ints and pointers if we use a different macro for the block number.)
 596    The NOTE_INSN_RANGE_{START,END} and NOTE_INSN_LIVE notes record their
 597    information as a rtx in the field.  */
 598
 599 #define NOTE_SOURCE_FILE(INSN)  XCSTR(INSN, 3, NOTE)
 600 #define NOTE_BLOCK(INSN)        XCTREE(INSN, 3, NOTE)
 601 #define NOTE_EH_HANDLER(INSN)   XCINT(INSN, 3, NOTE)
 602 #define NOTE_RANGE_INFO(INSN)   XCEXP(INSN, 3, NOTE)
 603 #define NOTE_LIVE_INFO(INSN)    XCEXP(INSN, 3, NOTE)
 604 #define NOTE_BASIC_BLOCK(INSN)  XCBBDEF(INSN, 3, NOTE)
 605 #define NOTE_EXPECTED_VALUE(INSN) XCEXP(INSN, 3, NOTE)
 606
 607 /* In a NOTE that is a line number, this is the line number.
 608    Other kinds of NOTEs are identified by negative numbers here.  */
 609 #define NOTE_LINE_NUMBER(INSN) XCINT(INSN, 4, NOTE)
 610
 611 /* Nonzero if INSN is a note marking the beginning of a basic block.  */
 612 #define NOTE_INSN_BASIC_BLOCK_P(INSN)                   \
 613   (GET_CODE (INSN) == NOTE                              \
 614    && NOTE_LINE_NUMBER (INSN) == NOTE_INSN_BASIC_BLOCK)
 615
 616 /* Codes that appear in the NOTE_LINE_NUMBER field
 617    for kinds of notes that are not line numbers.
 618
 619    Notice that we do not try to use zero here for any of
 620    the special note codes because sometimes the source line
 621    actually can be zero!  This happens (for example) when we
 622    are generating code for the per-translation-unit constructor
 623    and destructor routines for some C++ translation unit.
 624
 625    If you should change any of the following values, or if you
 626    should add a new value here, don't forget to change the
 627    note_insn_name array in rtl.c.  */
 628
 629 enum insn_note
 630 {
 631   /* Keep all of these numbers negative.  Adjust as needed.  */
 632   NOTE_INSN_BIAS = -100,
 633
 634   /* This note is used to get rid of an insn
 635      when it isn't safe to patch the insn out of the chain.  */
 636   NOTE_INSN_DELETED,
 637
 638   /* These are used to mark the beginning and end of a lexical block.
 639      See NOTE_BLOCK, identify_blocks and reorder_blocks.  */
 640   NOTE_INSN_BLOCK_BEG,
 641   NOTE_INSN_BLOCK_END,
 642
 643   /* These mark the extremes of a loop.  */
 644   NOTE_INSN_LOOP_BEG,
 645   NOTE_INSN_LOOP_END,
 646
 647   /* Generated at the place in a loop that `continue' jumps to.  */
 648   NOTE_INSN_LOOP_CONT,
 649   /* Generated at the start of a duplicated exit test.  */
 650   NOTE_INSN_LOOP_VTOP,
 651
 652   /* This kind of note is generated at the end of the function body,
 653      just before the return insn or return label.  In an optimizing
 654      compilation it is deleted by the first jump optimization, after
 655      enabling that optimizer to determine whether control can fall
 656      off the end of the function body without a return statement.  */
 657   NOTE_INSN_FUNCTION_END,
 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 /* For a SET rtx, SET_DEST is the place that is set
 901    and SET_SRC is the value it is set to.  */
 902 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
 903 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
 904
 905 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
 906 #define TRAP_CONDITION(RTX) XCEXP(RTX, 0, TRAP_IF)
 907 #define TRAP_CODE(RTX) XCEXP(RTX, 1, TRAP_IF)
 908
 909 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
 910    conditionally executing the code on, COND_EXEC_CODE is the code
 911    to execute if the condition is true.  */
 912 #define COND_EXEC_TEST(RTX) XCEXP(RTX, 0, COND_EXEC)
 913 #define COND_EXEC_CODE(RTX) XCEXP(RTX, 1, COND_EXEC)
 914
 915 /* 1 in a SYMBOL_REF if it addresses this function's constants pool.  */
 916 #define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
 917
 918 /* 1 in a SYMBOL_REF if it addresses this function's string constant pool.  */
 919 #define STRING_POOL_ADDRESS_P(RTX) ((RTX)->frame_related)
 920
 921 /* Flag in a SYMBOL_REF for machine-specific purposes.  */
 922 #define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
 923
 924 /* 1 means a SYMBOL_REF has been the library function in emit_library_call.  */
 925 #define SYMBOL_REF_USED(RTX) ((RTX)->used)
 926
 927 /* 1 means a SYMBOL_REF is weak.  */
 928 #define SYMBOL_REF_WEAK(RTX) ((RTX)->integrated)
 929
 930 /* Define a macro to look for REG_INC notes,
 931    but save time on machines where they never exist.  */
 932
 933 /* Don't continue this line--convex cc version 4.1 would lose.  */
 934 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
 935 #define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
 936 #else
 937 #define FIND_REG_INC_NOTE(insn, reg) 0
 938 #endif
 939
 940 /* Indicate whether the machine has any sort of auto increment addressing.
 941    If not, we can avoid checking for REG_INC notes.  */
 942
 943 /* Don't continue this line--convex cc version 4.1 would lose.  */
 944 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
 945 #define AUTO_INC_DEC
 946 #endif
 947
 948 #ifndef HAVE_PRE_INCREMENT
 949 #define HAVE_PRE_INCREMENT 0
 950 #endif
 951
 952 #ifndef HAVE_PRE_DECREMENT
 953 #define HAVE_PRE_DECREMENT 0
 954 #endif
 955
 956 #ifndef HAVE_POST_INCREMENT
 957 #define HAVE_POST_INCREMENT 0
 958 #endif
 959
 960 #ifndef HAVE_POST_DECREMENT
 961 #define HAVE_POST_DECREMENT 0
 962 #endif
 963
 964 #ifndef HAVE_POST_MODIFY_DISP
 965 #define HAVE_POST_MODIFY_DISP 0
 966 #endif
 967
 968 #ifndef HAVE_POST_MODIFY_REG
 969 #define HAVE_POST_MODIFY_REG 0
 970 #endif
 971
 972 #ifndef HAVE_PRE_MODIFY_DISP
 973 #define HAVE_PRE_MODIFY_DISP 0
 974 #endif
 975
 976 #ifndef HAVE_PRE_MODIFY_REG
 977 #define HAVE_PRE_MODIFY_REG 0
 978 #endif
 979
 980
 981 /* Some architectures do not have complete pre/post increment/decrement
 982    instruction sets, or only move some modes efficiently.  These macros
 983    allow us to tune autoincrement generation.  */
 984
 985 #ifndef USE_LOAD_POST_INCREMENT
 986 #define USE_LOAD_POST_INCREMENT(MODE)   HAVE_POST_INCREMENT
 987 #endif
 988
 989 #ifndef USE_LOAD_POST_DECREMENT
 990 #define USE_LOAD_POST_DECREMENT(MODE)   HAVE_POST_DECREMENT
 991 #endif
 992
 993 #ifndef USE_LOAD_PRE_INCREMENT
 994 #define USE_LOAD_PRE_INCREMENT(MODE)    HAVE_PRE_INCREMENT
 995 #endif
 996
 997 #ifndef USE_LOAD_PRE_DECREMENT
 998 #define USE_LOAD_PRE_DECREMENT(MODE)    HAVE_PRE_DECREMENT
 999 #endif
1000
1001 #ifndef USE_STORE_POST_INCREMENT
1002 #define USE_STORE_POST_INCREMENT(MODE)  HAVE_POST_INCREMENT
1003 #endif
1004
1005 #ifndef USE_STORE_POST_DECREMENT
1006 #define USE_STORE_POST_DECREMENT(MODE)  HAVE_POST_DECREMENT
1007 #endif
1008
1009 #ifndef USE_STORE_PRE_INCREMENT
1010 #define USE_STORE_PRE_INCREMENT(MODE)   HAVE_PRE_INCREMENT
1011 #endif
1012
1013 #ifndef USE_STORE_PRE_DECREMENT
1014 #define USE_STORE_PRE_DECREMENT(MODE)   HAVE_PRE_DECREMENT
1015 #endif
1016
1017
1018 /* Accessors for RANGE_INFO.  */
1019 /* For RANGE_{START,END} notes return the RANGE_START note.  */
1020 #define RANGE_INFO_NOTE_START(INSN) XCEXP (INSN, 0, RANGE_INFO)
1021
1022 /* For RANGE_{START,END} notes return the RANGE_START note.  */
1023 #define RANGE_INFO_NOTE_END(INSN) XCEXP (INSN, 1, RANGE_INFO)
1024
1025 /* For RANGE_{START,END} notes, return the vector containing the registers used
1026    in the range.  */
1027 #define RANGE_INFO_REGS(INSN) XCVEC (INSN, 2, RANGE_INFO)
1028 #define RANGE_INFO_REGS_REG(INSN, N) XCVECEXP (INSN, 2, N, RANGE_INFO)
1029 #define RANGE_INFO_NUM_REGS(INSN) XCVECLEN (INSN, 2, RANGE_INFO)
1030
1031 /* For RANGE_{START,END} notes, the number of calls within the range.  */
1032 #define RANGE_INFO_NCALLS(INSN) XCINT (INSN, 3, RANGE_INFO)
1033
1034 /* For RANGE_{START,END} notes, the number of insns within the range.  */
1035 #define RANGE_INFO_NINSNS(INSN) XCINT (INSN, 4, RANGE_INFO)
1036
1037 /* For RANGE_{START,END} notes, a unique # to identify this range.  */
1038 #define RANGE_INFO_UNIQUE(INSN) XCINT (INSN, 5, RANGE_INFO)
1039
1040 /* For RANGE_{START,END} notes, the basic block # the range starts with. */
1041 #define RANGE_INFO_BB_START(INSN) XCINT (INSN, 6, RANGE_INFO)
1042
1043 /* For RANGE_{START,END} notes, the basic block # the range ends with. */
1044 #define RANGE_INFO_BB_END(INSN) XCINT (INSN, 7, RANGE_INFO)
1045
1046 /* For RANGE_{START,END} notes, the loop depth the range is in.  */
1047 #define RANGE_INFO_LOOP_DEPTH(INSN) XCINT (INSN, 8, RANGE_INFO)
1048
1049 /* For RANGE_{START,END} notes, the bitmap of live registers at the start
1050    of the range.  */
1051 #define RANGE_INFO_LIVE_START(INSN) XCBITMAP (INSN, 9, RANGE_INFO)
1052
1053 /* For RANGE_{START,END} notes, the bitmap of live registers at the end
1054    of the range.  */
1055 #define RANGE_INFO_LIVE_END(INSN) XCBITMAP (INSN, 10, RANGE_INFO)
1056
1057 /* For RANGE_START notes, the marker # of the start of the range.  */
1058 #define RANGE_INFO_MARKER_START(INSN) XCINT (INSN, 11, RANGE_INFO)
1059
1060 /* For RANGE_START notes, the marker # of the end of the range.  */
1061 #define RANGE_INFO_MARKER_END(INSN) XCINT (INSN, 12, RANGE_INFO)
1062
1063 /* Original pseudo register # for a live range note.  */
1064 #define RANGE_REG_PSEUDO(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 0, REG)
1065
1066 /* Pseudo register # original register is copied into or -1.  */
1067 #define RANGE_REG_COPY(INSN,N) XCINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 1, REG)
1068
1069 /* How many times a register in a live range note was referenced.  */
1070 #define RANGE_REG_REFS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 2)
1071
1072 /* How many times a register in a live range note was set.  */
1073 #define RANGE_REG_SETS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 3)
1074
1075 /* How many times a register in a live range note died.  */
1076 #define RANGE_REG_DEATHS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 4)
1077
1078 /* Whether the original value is needed to be copied into the range register at
1079    the start of the range. */
1080 #define RANGE_REG_COPY_FLAGS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 5)
1081
1082 /* # of insns the register copy is live over.  */
1083 #define RANGE_REG_LIVE_LENGTH(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 6)
1084
1085 /* # of calls the register copy is live over.  */
1086 #define RANGE_REG_N_CALLS(INSN,N) XINT (XCVECEXP (INSN, 2, N, RANGE_INFO), 7)
1087
1088 /* DECL_NODE pointer of the declaration if the register is a user defined
1089    variable.  */
1090 #define RANGE_REG_SYMBOL_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 8)
1091
1092 /* BLOCK_NODE pointer to the block the variable is declared in if the
1093    register is a user defined variable.  */
1094 #define RANGE_REG_BLOCK_NODE(INSN,N) XTREE (XCVECEXP (INSN, 2, N, RANGE_INFO), 9)
1095
1096 /* EXPR_LIST of the distinct ranges a variable is in.  */
1097 #define RANGE_VAR_LIST(INSN) (XEXP (INSN, 0))
1098
1099 /* Block a variable is declared in.  */
1100 #define RANGE_VAR_BLOCK(INSN) (XTREE (INSN, 1))
1101
1102 /* # of distinct ranges a variable is in.  */
1103 #define RANGE_VAR_NUM(INSN) (XINT (INSN, 2))
1104
1105 /* For a NOTE_INSN_LIVE note, the registers which are currently live.  */
1106 #define RANGE_LIVE_BITMAP(INSN) (XBITMAP (INSN, 0))
1107
1108 /* For a NOTE_INSN_LIVE note, the original basic block number.  */
1109 #define RANGE_LIVE_ORIG_BLOCK(INSN) (XINT (INSN, 1))
1110
1111 /* Determine if the insn is a PHI node.  */
1112 #define PHI_NODE_P(X)                           \
1113   (X && GET_CODE (X) == INSN                    \
1114    && GET_CODE (PATTERN (X)) == SET             \
1115    && GET_CODE (SET_SRC (PATTERN (X))) == PHI)
1116 \f
1117 /* Nonzero if we need to distinguish between the return value of this function
1118    and the return value of a function called by this function.  This helps
1119    integrate.c.
1120    This is 1 until after the rtl generation pass.  */
1121 extern int rtx_equal_function_value_matters;
1122
1123 /* Nonzero when we are generating CONCATs.  */
1124 extern int generating_concat_p;
1125
1126 /* Generally useful functions.  */
1127
1128 /* In expmed.c */
1129 extern int ceil_log2                    PARAMS ((unsigned HOST_WIDE_INT));
1130
1131 #define plus_constant(X,C) plus_constant_wide (X, (HOST_WIDE_INT) (C))
1132
1133 /* In builtins.c */
1134 extern rtx expand_builtin_expect_jump   PARAMS ((tree, rtx, rtx));
1135
1136 /* In explow.c */
1137 extern void set_stack_check_libfunc PARAMS ((rtx));
1138 extern HOST_WIDE_INT trunc_int_for_mode PARAMS ((HOST_WIDE_INT,
1139                                                enum machine_mode));
1140 extern rtx plus_constant_wide            PARAMS ((rtx, HOST_WIDE_INT));
1141 extern rtx plus_constant_for_output_wide PARAMS ((rtx, HOST_WIDE_INT));
1142 extern void optimize_save_area_alloca   PARAMS ((rtx));
1143
1144 /* In emit-rtl.c */
1145 extern rtx gen_rtx                      PARAMS ((enum rtx_code,
1146                                                  enum machine_mode, ...));
1147 extern rtvec gen_rtvec                  PARAMS ((int, ...));
1148 extern rtx copy_insn_1                  PARAMS ((rtx));
1149 extern rtx copy_insn                    PARAMS ((rtx));
1150
1151 /* In rtl.c */
1152 extern rtx rtx_alloc                    PARAMS ((RTX_CODE));
1153 extern rtvec rtvec_alloc                PARAMS ((int));
1154 extern rtx copy_rtx                     PARAMS ((rtx));
1155
1156 /* In emit-rtl.c */
1157 extern rtx copy_rtx_if_shared           PARAMS ((rtx));
1158
1159 /* In rtl.c */
1160 extern rtx copy_most_rtx                PARAMS ((rtx, rtx));
1161 extern rtx shallow_copy_rtx             PARAMS ((rtx));
1162 extern int rtx_equal_p                  PARAMS ((rtx, rtx));
1163
1164 /* In emit-rtl.c */
1165 extern rtvec gen_rtvec_v                PARAMS ((int, rtx *));
1166 extern rtx gen_reg_rtx                  PARAMS ((enum machine_mode));
1167 extern rtx gen_label_rtx                PARAMS ((void));
1168 extern int subreg_hard_regno            PARAMS ((rtx, int));
1169 extern rtx gen_lowpart_common           PARAMS ((enum machine_mode, rtx));
1170 extern rtx gen_lowpart                  PARAMS ((enum machine_mode, rtx));
1171
1172 /* In cse.c */
1173 extern rtx gen_lowpart_if_possible      PARAMS ((enum machine_mode, rtx));
1174
1175 /* In emit-rtl.c */
1176 extern rtx gen_highpart                 PARAMS ((enum machine_mode, rtx));
1177 extern rtx gen_highpart_mode            PARAMS ((enum machine_mode,
1178                                                  enum machine_mode, rtx));
1179 extern rtx gen_realpart                 PARAMS ((enum machine_mode, rtx));
1180 extern rtx gen_imagpart                 PARAMS ((enum machine_mode, rtx));
1181 extern rtx operand_subword              PARAMS ((rtx, unsigned int, int,
1182                                                  enum machine_mode));
1183 extern rtx constant_subword             PARAMS ((rtx, int,
1184                                                  enum machine_mode));
1185
1186 /* In emit-rtl.c */
1187 extern rtx operand_subword_force        PARAMS ((rtx, unsigned int,
1188                                                  enum machine_mode));
1189 extern int subreg_lowpart_p             PARAMS ((rtx));
1190 extern unsigned int subreg_lowpart_offset PARAMS ((enum machine_mode,
1191                                                    enum machine_mode));
1192 extern unsigned int subreg_highpart_offset PARAMS ((enum machine_mode,
1193                                                     enum machine_mode));
1194 extern rtx make_safe_from               PARAMS ((rtx, rtx));
1195 extern rtx convert_memory_address       PARAMS ((enum machine_mode, rtx));
1196 extern rtx get_insns                    PARAMS ((void));
1197 extern const char *get_insn_name        PARAMS ((int));
1198 extern rtx get_last_insn                PARAMS ((void));
1199 extern rtx get_last_insn_anywhere       PARAMS ((void));
1200 extern void start_sequence              PARAMS ((void));
1201 extern void push_to_sequence            PARAMS ((rtx));
1202 extern void end_sequence                PARAMS ((void));
1203 extern void push_to_full_sequence       PARAMS ((rtx, rtx));
1204 extern void end_full_sequence           PARAMS ((rtx*, rtx*));
1205 extern rtx gen_sequence                 PARAMS ((void));
1206
1207 /* In varasm.c  */
1208 extern rtx immed_double_const           PARAMS ((HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode));
1209 extern rtx force_const_mem              PARAMS ((enum machine_mode, rtx));
1210
1211 /* In varasm.c  */
1212 extern rtx get_pool_constant            PARAMS ((rtx));
1213 extern enum machine_mode get_pool_mode  PARAMS ((rtx));
1214 extern rtx get_pool_constant_for_function       PARAMS ((struct function *, rtx));
1215 extern enum machine_mode get_pool_mode_for_function     PARAMS ((struct function *, rtx));
1216 extern int get_pool_offset              PARAMS ((rtx));
1217 extern rtx simplify_subtraction         PARAMS ((rtx));
1218
1219 /* In function.c  */
1220 extern rtx assign_stack_local           PARAMS ((enum machine_mode,
1221                                                HOST_WIDE_INT, int));
1222 extern rtx assign_stack_temp            PARAMS ((enum machine_mode,
1223                                                HOST_WIDE_INT, int));
1224 extern rtx assign_temp                  PARAMS ((tree, int, int, int));
1225 /* In emit-rtl.c */
1226 extern rtx emit_insn_before             PARAMS ((rtx, rtx));
1227 extern rtx emit_jump_insn_before        PARAMS ((rtx, rtx));
1228 extern rtx emit_call_insn_before        PARAMS ((rtx, rtx));
1229 extern rtx emit_barrier_before          PARAMS ((rtx));
1230 extern rtx emit_label_before            PARAMS ((rtx, rtx));
1231 extern rtx emit_note_before             PARAMS ((int, rtx));
1232 extern rtx emit_insn_after              PARAMS ((rtx, rtx));
1233 extern rtx emit_jump_insn_after         PARAMS ((rtx, rtx));
1234 extern rtx emit_barrier_after           PARAMS ((rtx));
1235 extern rtx emit_label_after             PARAMS ((rtx, rtx));
1236 extern rtx emit_note_after              PARAMS ((int, rtx));
1237 extern rtx emit_line_note_after         PARAMS ((const char *, int, rtx));
1238 extern rtx emit_insn                    PARAMS ((rtx));
1239 extern rtx emit_insns                   PARAMS ((rtx));
1240 extern rtx emit_insns_before            PARAMS ((rtx, rtx));
1241 extern rtx emit_insns_after             PARAMS ((rtx, rtx));
1242 extern rtx emit_jump_insn               PARAMS ((rtx));
1243 extern rtx emit_call_insn               PARAMS ((rtx));
1244 extern rtx emit_label                   PARAMS ((rtx));
1245 extern rtx emit_barrier                 PARAMS ((void));
1246 extern rtx emit_line_note               PARAMS ((const char *, int));
1247 extern rtx emit_note                    PARAMS ((const char *, int));
1248 extern rtx emit_line_note_force         PARAMS ((const char *, int));
1249 extern rtx make_insn_raw                PARAMS ((rtx));
1250 extern rtx previous_insn                PARAMS ((rtx));
1251 extern rtx next_insn                    PARAMS ((rtx));
1252 extern rtx prev_nonnote_insn            PARAMS ((rtx));
1253 extern rtx next_nonnote_insn            PARAMS ((rtx));
1254 extern rtx prev_real_insn               PARAMS ((rtx));
1255 extern rtx next_real_insn               PARAMS ((rtx));
1256 extern rtx prev_active_insn             PARAMS ((rtx));
1257 extern rtx next_active_insn             PARAMS ((rtx));
1258 extern int active_insn_p                PARAMS ((rtx));
1259 extern rtx prev_label                   PARAMS ((rtx));
1260 extern rtx next_label                   PARAMS ((rtx));
1261 extern rtx next_cc0_user                PARAMS ((rtx));
1262 extern rtx prev_cc0_setter              PARAMS ((rtx));
1263
1264 /* In jump.c */
1265 extern rtx next_nondeleted_insn         PARAMS ((rtx));
1266 extern enum rtx_code reverse_condition  PARAMS ((enum rtx_code));
1267 extern enum rtx_code reverse_condition_maybe_unordered PARAMS ((enum rtx_code));
1268 extern enum rtx_code swap_condition     PARAMS ((enum rtx_code));
1269 extern enum rtx_code unsigned_condition PARAMS ((enum rtx_code));
1270 extern enum rtx_code signed_condition   PARAMS ((enum rtx_code));
1271 extern void mark_jump_label             PARAMS ((rtx, rtx, int));
1272 extern void cleanup_barriers            PARAMS ((void));
1273
1274 /* In jump.c */
1275 extern void squeeze_notes               PARAMS ((rtx *, rtx *));
1276 extern rtx delete_insn                  PARAMS ((rtx));
1277 extern void delete_jump                 PARAMS ((rtx));
1278 extern void delete_barrier              PARAMS ((rtx));
1279 extern rtx get_label_before             PARAMS ((rtx));
1280 extern rtx get_label_after              PARAMS ((rtx));
1281 extern rtx follow_jumps                 PARAMS ((rtx));
1282
1283 /* In recog.c  */
1284 extern rtx *find_constant_term_loc      PARAMS ((rtx *));
1285
1286 /* In emit-rtl.c  */
1287 extern rtx try_split                    PARAMS ((rtx, rtx, int));
1288 extern int split_branch_probability;
1289
1290 /* In unknown file  */
1291 extern rtx split_insns                  PARAMS ((rtx, rtx));
1292
1293 /* In simplify-rtx.c  */
1294 extern rtx simplify_unary_operation     PARAMS ((enum rtx_code,
1295                                                  enum machine_mode, rtx,
1296                                                  enum machine_mode));
1297 extern rtx simplify_binary_operation    PARAMS ((enum rtx_code,
1298                                                  enum machine_mode, rtx,
1299                                                  rtx));
1300 extern rtx simplify_ternary_operation   PARAMS ((enum rtx_code,
1301                                                  enum machine_mode,
1302                                                  enum machine_mode, rtx, rtx,
1303                                                  rtx));
1304 extern rtx simplify_relational_operation PARAMS ((enum rtx_code,
1305                                                   enum machine_mode, rtx,
1306                                                   rtx));
1307 extern rtx simplify_gen_binary          PARAMS ((enum rtx_code,
1308                                                  enum machine_mode,
1309                                                  rtx, rtx));
1310 extern rtx simplify_gen_unary           PARAMS ((enum rtx_code,
1311                                                  enum machine_mode, rtx,
1312                                                  enum machine_mode));
1313 extern rtx simplify_gen_ternary         PARAMS ((enum rtx_code,
1314                                                  enum machine_mode,
1315                                                  enum machine_mode,
1316                                                  rtx, rtx, rtx));
1317 extern rtx simplify_gen_relational      PARAMS ((enum rtx_code,
1318                                                  enum machine_mode,
1319                                                  enum machine_mode,
1320                                                  rtx, rtx));
1321 extern rtx simplify_subreg              PARAMS ((enum machine_mode,
1322                                                  rtx,
1323                                                  enum machine_mode,
1324                                                  unsigned int));
1325 extern rtx simplify_gen_subreg          PARAMS ((enum machine_mode,
1326                                                  rtx,
1327                                                  enum machine_mode,
1328                                                  unsigned int));
1329 extern rtx simplify_replace_rtx         PARAMS ((rtx, rtx, rtx));
1330 extern rtx simplify_rtx                 PARAMS ((rtx));
1331 extern rtx avoid_constant_pool_reference PARAMS ((rtx));
1332
1333 /* In function.c  */
1334 extern rtx gen_mem_addressof            PARAMS ((rtx, tree));
1335
1336 /* In regclass.c  */
1337 extern enum machine_mode choose_hard_reg_mode PARAMS ((unsigned int,
1338                                                        unsigned int));
1339
1340 /* In emit-rtl.c  */
1341 extern void set_unique_reg_note         PARAMS ((rtx, enum reg_note, rtx));
1342
1343 /* Functions in rtlanal.c */
1344
1345 /* Single set is implemented as macro for performance reasons.  */
1346 #define single_set(I) (INSN_P (I) \
1347                        ? (GET_CODE (PATTERN (I)) == SET \
1348                           ? PATTERN (I) : single_set_1 (I)) \
1349                        : NULL_RTX)
1350 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1351
1352 extern int rtx_addr_can_trap_p          PARAMS ((rtx));
1353 extern int rtx_unstable_p               PARAMS ((rtx));
1354 extern int rtx_varies_p                 PARAMS ((rtx, int));
1355 extern int rtx_addr_varies_p            PARAMS ((rtx, int));
1356 extern HOST_WIDE_INT get_integer_term   PARAMS ((rtx));
1357 extern rtx get_related_value            PARAMS ((rtx));
1358 extern int reg_mentioned_p              PARAMS ((rtx, rtx));
1359 extern int count_occurrences            PARAMS ((rtx, rtx, int));
1360 extern int reg_referenced_p             PARAMS ((rtx, rtx));
1361 extern int reg_used_between_p           PARAMS ((rtx, rtx, rtx));
1362 extern int reg_referenced_between_p     PARAMS ((rtx, rtx, rtx));
1363 extern int reg_set_between_p            PARAMS ((rtx, rtx, rtx));
1364 extern int regs_set_between_p           PARAMS ((rtx, rtx, rtx));
1365 extern int swap_commutative_operands_p  PARAMS ((rtx, rtx));
1366 extern int modified_between_p           PARAMS ((rtx, rtx, rtx));
1367 extern int no_labels_between_p          PARAMS ((rtx, rtx));
1368 extern int no_jumps_between_p           PARAMS ((rtx, rtx));
1369 extern int modified_in_p                PARAMS ((rtx, rtx));
1370 extern int insn_dependent_p             PARAMS ((rtx, rtx));
1371 extern int reg_set_p                    PARAMS ((rtx, rtx));
1372 extern rtx single_set_2                 PARAMS ((rtx, rtx));
1373 extern int multiple_sets                PARAMS ((rtx));
1374 extern int set_noop_p                   PARAMS ((rtx));
1375 extern int noop_move_p                  PARAMS ((rtx));
1376 extern rtx find_last_value              PARAMS ((rtx, rtx *, rtx, int));
1377 extern int refers_to_regno_p            PARAMS ((unsigned int, unsigned int,
1378                                                  rtx, rtx *));
1379 extern int reg_overlap_mentioned_p      PARAMS ((rtx, rtx));
1380 extern rtx set_of                       PARAMS ((rtx, rtx));
1381 extern void note_stores                 PARAMS ((rtx,
1382                                                  void (*) (rtx, rtx, void *),
1383                                                  void *));
1384 extern void note_uses                   PARAMS ((rtx *,
1385                                                  void (*) (rtx *, void *),
1386                                                  void *));
1387 extern rtx reg_set_last                 PARAMS ((rtx, rtx));
1388 extern int dead_or_set_p                PARAMS ((rtx, rtx));
1389 extern int dead_or_set_regno_p          PARAMS ((rtx, unsigned int));
1390 extern rtx find_reg_note                PARAMS ((rtx, enum reg_note, rtx));
1391 extern rtx find_regno_note              PARAMS ((rtx, enum reg_note,
1392                                                  unsigned int));
1393 extern rtx find_reg_equal_equiv_note    PARAMS ((rtx));
1394 extern int find_reg_fusage              PARAMS ((rtx, enum rtx_code, rtx));
1395 extern int find_regno_fusage            PARAMS ((rtx, enum rtx_code,
1396                                                  unsigned int));
1397 extern void remove_note                 PARAMS ((rtx, rtx));
1398 extern int side_effects_p               PARAMS ((rtx));
1399 extern int volatile_refs_p              PARAMS ((rtx));
1400 extern int volatile_insn_p              PARAMS ((rtx));
1401 extern int may_trap_p                   PARAMS ((rtx));
1402 extern int inequality_comparisons_p     PARAMS ((rtx));
1403 extern rtx replace_rtx                  PARAMS ((rtx, rtx, rtx));
1404 extern rtx replace_regs                 PARAMS ((rtx, rtx *, unsigned int,
1405                                                  int));
1406 extern int computed_jump_p              PARAMS ((rtx));
1407 typedef int (*rtx_function)             PARAMS ((rtx *, void *));
1408 extern int for_each_rtx                 PARAMS ((rtx *, rtx_function, void *));
1409 extern rtx regno_use_in                 PARAMS ((unsigned int, rtx));
1410 extern int auto_inc_p                   PARAMS ((rtx));
1411 extern void remove_node_from_expr_list  PARAMS ((rtx, rtx *));
1412 extern int insns_safe_to_move_p         PARAMS ((rtx, rtx, rtx *));
1413 extern int loc_mentioned_in_p           PARAMS ((rtx *, rtx));
1414 extern rtx find_first_parameter_load    PARAMS ((rtx, rtx));
1415
1416 /* flow.c */
1417
1418 extern rtx find_use_as_address          PARAMS ((rtx, rtx, HOST_WIDE_INT));
1419 void init_EXPR_INSN_LIST_cache          PARAMS ((void));
1420 void free_EXPR_LIST_list                PARAMS ((rtx *));
1421 void free_INSN_LIST_list                PARAMS ((rtx *));
1422 void free_EXPR_LIST_node                PARAMS ((rtx));
1423 void free_INSN_LIST_node                PARAMS ((rtx));
1424 rtx alloc_INSN_LIST                     PARAMS ((rtx, rtx));
1425 rtx alloc_EXPR_LIST                     PARAMS ((int, rtx, rtx));
1426 void clear_log_links                    PARAMS ((rtx));
1427
1428 /* regclass.c */
1429
1430 /* Maximum number of parallel sets and clobbers in any insn in this fn.
1431    Always at least 3, since the combiner could put that many togetherm
1432    and we want this to remain correct for all the remaining passes.  */
1433
1434 extern int max_parallel;
1435
1436 /* Free up register info memory.  */
1437 extern void free_reg_info               PARAMS ((void));
1438
1439 /* recog.c */
1440 extern int asm_noperands                PARAMS ((rtx));
1441 extern const char *decode_asm_operands  PARAMS ((rtx, rtx *, rtx **,
1442                                                const char **,
1443                                                enum machine_mode *));
1444
1445 extern enum reg_class reg_preferred_class PARAMS ((int));
1446 extern enum reg_class reg_alternate_class PARAMS ((int));
1447
1448 extern rtx get_first_nonparm_insn       PARAMS ((void));
1449
1450 extern void split_all_insns             PARAMS ((int));
1451 extern void split_all_insns_noflow      PARAMS ((void));
1452
1453 #define MAX_SAVED_CONST_INT 64
1454 extern rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
1455
1456 #define const0_rtx      (const_int_rtx[MAX_SAVED_CONST_INT])
1457 #define const1_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+1])
1458 #define const2_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+2])
1459 #define constm1_rtx     (const_int_rtx[MAX_SAVED_CONST_INT-1])
1460 extern rtx const_true_rtx;
1461
1462 extern rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
1463
1464 /* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
1465    same as VOIDmode.  */
1466
1467 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
1468
1469 /* Likewise, for the constants 1 and 2.  */
1470
1471 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
1472 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
1473
1474 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
1475    is used to represent the frame pointer.  This is because the
1476    hard frame pointer and the automatic variables are separated by an amount
1477    that cannot be determined until after register allocation.  We can assume
1478    that in this case ELIMINABLE_REGS will be defined, one action of which
1479    will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM. */
1480 #ifndef HARD_FRAME_POINTER_REGNUM
1481 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
1482 #endif
1483
1484 /* Index labels for global_rtl.  */
1485 enum global_rtl_index
1486 {
1487   GR_PC,
1488   GR_CC0,
1489   GR_STACK_POINTER,
1490   GR_FRAME_POINTER,
1491 /* For register elimination to work properly these hard_frame_pointer_rtx,
1492    frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
1493    the same register.  */
1494 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1495   GR_ARG_POINTER = GR_FRAME_POINTER,
1496 #endif
1497 #if HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM
1498   GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
1499 #else
1500   GR_HARD_FRAME_POINTER,
1501 #endif
1502 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
1503 #if HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
1504   GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
1505 #else
1506   GR_ARG_POINTER,
1507 #endif
1508 #endif
1509   GR_VIRTUAL_INCOMING_ARGS,
1510   GR_VIRTUAL_STACK_ARGS,
1511   GR_VIRTUAL_STACK_DYNAMIC,
1512   GR_VIRTUAL_OUTGOING_ARGS,
1513   GR_VIRTUAL_CFA,
1514
1515   GR_MAX
1516 };
1517
1518 /* Pointers to standard pieces of rtx are stored here.  */
1519 extern rtx global_rtl[GR_MAX];
1520
1521 /* Standard pieces of rtx, to be substituted directly into things.  */
1522 #define pc_rtx                  (global_rtl[GR_PC])
1523 #define cc0_rtx                 (global_rtl[GR_CC0])
1524
1525 /* All references to certain hard regs, except those created
1526    by allocating pseudo regs into them (when that's possible),
1527    go through these unique rtx objects.  */
1528 #define stack_pointer_rtx       (global_rtl[GR_STACK_POINTER])
1529 #define frame_pointer_rtx       (global_rtl[GR_FRAME_POINTER])
1530 #define hard_frame_pointer_rtx  (global_rtl[GR_HARD_FRAME_POINTER])
1531 #define arg_pointer_rtx         (global_rtl[GR_ARG_POINTER])
1532
1533 extern rtx pic_offset_table_rtx;
1534 extern rtx struct_value_rtx;
1535 extern rtx struct_value_incoming_rtx;
1536 extern rtx static_chain_rtx;
1537 extern rtx static_chain_incoming_rtx;
1538 extern rtx return_address_pointer_rtx;
1539
1540 /* Include the RTL generation functions.  */
1541
1542 #ifndef NO_GENRTL_H
1543 #include "genrtl.h"
1544 #endif
1545
1546 /* There are some RTL codes that require special attention; the
1547    generation functions included above do the raw handling.  If you
1548    add to this list, modify special_rtx in gengenrtl.c as well.  You
1549    should also modify gen_rtx to use the special function.  */
1550
1551 extern rtx gen_rtx_CONST_DOUBLE PARAMS ((enum machine_mode, rtx,
1552                                        HOST_WIDE_INT, HOST_WIDE_INT));
1553 extern rtx gen_rtx_CONST_INT PARAMS ((enum machine_mode, HOST_WIDE_INT));
1554 extern rtx gen_raw_REG PARAMS ((enum machine_mode, int));
1555 extern rtx gen_rtx_REG PARAMS ((enum machine_mode, int));
1556 extern rtx gen_rtx_SUBREG PARAMS ((enum machine_mode, rtx, int));
1557 extern rtx gen_rtx_MEM PARAMS ((enum machine_mode, rtx));
1558
1559 extern rtx gen_lowpart_SUBREG PARAMS ((enum machine_mode, rtx));
1560
1561 /* We need the cast here to ensure that we get the same result both with
1562    and without prototypes.  */
1563 #define GEN_INT(N)  gen_rtx_CONST_INT (VOIDmode, (HOST_WIDE_INT) (N))
1564
1565 /* Virtual registers are used during RTL generation to refer to locations into
1566    the stack frame when the actual location isn't known until RTL generation
1567    is complete.  The routine instantiate_virtual_regs replaces these with
1568    the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
1569    a constant.  */
1570
1571 #define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
1572
1573 /* This points to the first word of the incoming arguments passed on the stack,
1574    either by the caller or by the callee when pretending it was passed by the
1575    caller.  */
1576
1577 #define virtual_incoming_args_rtx       (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
1578
1579 #define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
1580
1581 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
1582    variable on the stack.  Otherwise, it points to the first variable on
1583    the stack.  */
1584
1585 #define virtual_stack_vars_rtx          (global_rtl[GR_VIRTUAL_STACK_ARGS])
1586
1587 #define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
1588
1589 /* This points to the location of dynamically-allocated memory on the stack
1590    immediately after the stack pointer has been adjusted by the amount
1591    desired.  */
1592
1593 #define virtual_stack_dynamic_rtx       (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
1594
1595 #define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
1596
1597 /* This points to the location in the stack at which outgoing arguments should
1598    be written when the stack is pre-pushed (arguments pushed using push
1599    insns always use sp).  */
1600
1601 #define virtual_outgoing_args_rtx       (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
1602
1603 #define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
1604
1605 /* This points to the Canonical Frame Address of the function.  This
1606    should corrospond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
1607    but is calculated relative to the arg pointer for simplicity; the
1608    frame pointer nor stack pointer are necessarily fixed relative to
1609    the CFA until after reload.  */
1610
1611 #define virtual_cfa_rtx                 (global_rtl[GR_VIRTUAL_CFA])
1612
1613 #define VIRTUAL_CFA_REGNUM              ((FIRST_VIRTUAL_REGISTER) + 4)
1614
1615 #define LAST_VIRTUAL_REGISTER           ((FIRST_VIRTUAL_REGISTER) + 4)
1616
1617 /* REGNUM never really appearing in the INSN stream.  */
1618 #define INVALID_REGNUM                  (~(unsigned int)0)
1619
1620 extern rtx find_next_ref                PARAMS ((rtx, rtx));
1621
1622 extern rtx output_constant_def          PARAMS ((tree, int));
1623 extern rtx immed_real_const             PARAMS ((tree));
1624
1625 /* Define a default value for STORE_FLAG_VALUE.  */
1626
1627 #ifndef STORE_FLAG_VALUE
1628 #define STORE_FLAG_VALUE 1
1629 #endif
1630
1631 /* Nonzero after the second flow pass has completed.
1632    Set to 1 or 0 by toplev.c  */
1633 extern int flow2_completed;
1634
1635 /* Nonzero after end of reload pass.
1636    Set to 1 or 0 by reload1.c.  */
1637
1638 extern int reload_completed;
1639
1640 /* Set to 1 while reload_as_needed is operating.
1641    Required by some machines to handle any generated moves differently.  */
1642
1643 extern int reload_in_progress;
1644
1645 /* If this is nonzero, we do not bother generating VOLATILE
1646    around volatile memory references, and we are willing to
1647    output indirect addresses.  If cse is to follow, we reject
1648    indirect addresses so a useful potential cse is generated;
1649    if it is used only once, instruction combination will produce
1650    the same indirect address eventually.  */
1651 extern int cse_not_expected;
1652
1653 /* Set to nonzero before life analysis to indicate that it is unsafe to
1654    generate any new pseudo registers.  */
1655 extern int no_new_pseudos;
1656
1657 /* Translates rtx code to tree code, for those codes needed by
1658    REAL_ARITHMETIC.  The function returns an int because the caller may not
1659    know what `enum tree_code' means.  */
1660
1661 extern int rtx_to_tree_code     PARAMS ((enum rtx_code));
1662
1663 /* In tree.c */
1664 struct obstack;
1665 extern void gcc_obstack_init            PARAMS ((struct obstack *));
1666
1667 /* In cse.c */
1668 struct cse_basic_block_data;
1669
1670 /* Return the right cost to give to an operation
1671    to make the cost of the corresponding register-to-register instruction
1672    N times that of a fast register-to-register instruction.  */
1673 #define COSTS_N_INSNS(N) ((N) * 4)
1674
1675 /* Maximum cost of a rtl expression.  This value has the special meaning
1676    not to use an rtx with this cost under any circumstances.  */
1677 #define MAX_COST INT_MAX
1678
1679 extern int rtx_cost                     PARAMS ((rtx, enum rtx_code));
1680 extern int address_cost                 PARAMS ((rtx, enum machine_mode));
1681 extern void delete_trivially_dead_insns PARAMS ((rtx, int, int));
1682 #ifdef BUFSIZ
1683 extern int cse_main                     PARAMS ((rtx, int, int, FILE *));
1684 #endif
1685 extern void cse_end_of_basic_block      PARAMS ((rtx,
1686                                                 struct cse_basic_block_data *,
1687                                                 int, int, int));
1688
1689 /* In jump.c */
1690 extern int comparison_dominates_p       PARAMS ((enum rtx_code, enum rtx_code));
1691 extern int condjump_p                   PARAMS ((rtx));
1692 extern int any_condjump_p               PARAMS ((rtx));
1693 extern int any_uncondjump_p             PARAMS ((rtx));
1694 extern int safe_to_remove_jump_p        PARAMS ((rtx));
1695 extern rtx pc_set                       PARAMS ((rtx));
1696 extern rtx condjump_label               PARAMS ((rtx));
1697 extern int simplejump_p                 PARAMS ((rtx));
1698 extern int returnjump_p                 PARAMS ((rtx));
1699 extern int onlyjump_p                   PARAMS ((rtx));
1700 extern int only_sets_cc0_p              PARAMS ((rtx));
1701 extern int sets_cc0_p                   PARAMS ((rtx));
1702 extern int invert_jump_1                PARAMS ((rtx, rtx));
1703 extern int invert_jump                  PARAMS ((rtx, rtx, int));
1704 extern int rtx_renumbered_equal_p       PARAMS ((rtx, rtx));
1705 extern int true_regnum                  PARAMS ((rtx));
1706 extern int redirect_jump_1              PARAMS ((rtx, rtx));
1707 extern int redirect_jump                PARAMS ((rtx, rtx, int));
1708 extern void rebuild_jump_labels         PARAMS ((rtx));
1709 extern void thread_jumps                PARAMS ((rtx, int, int));
1710 extern int rtx_equal_for_thread_p       PARAMS ((rtx, rtx, rtx));
1711 extern int can_reverse_comparison_p     PARAMS ((rtx, rtx));
1712 extern enum rtx_code reversed_comparison_code PARAMS ((rtx, rtx));
1713 extern enum rtx_code reversed_comparison_code_parts PARAMS ((enum rtx_code,
1714                                                              rtx, rtx, rtx));
1715 extern void delete_for_peephole         PARAMS ((rtx, rtx));
1716 extern int condjump_in_parallel_p       PARAMS ((rtx));
1717 extern void never_reached_warning       PARAMS ((rtx));
1718 extern void purge_line_number_notes     PARAMS ((rtx));
1719 extern void copy_loop_headers           PARAMS ((rtx));
1720
1721 /* In emit-rtl.c. */
1722 extern int max_reg_num                          PARAMS ((void));
1723 extern int max_label_num                        PARAMS ((void));
1724 extern int get_first_label_num                  PARAMS ((void));
1725 extern void delete_insns_since                  PARAMS ((rtx));
1726 extern void mark_reg_pointer                    PARAMS ((rtx, int));
1727 extern void mark_user_reg                       PARAMS ((rtx));
1728 extern void reset_used_flags                    PARAMS ((rtx));
1729 extern void reorder_insns                       PARAMS ((rtx, rtx, rtx));
1730 extern int get_max_uid                          PARAMS ((void));
1731 extern int in_sequence_p                        PARAMS ((void));
1732 extern void force_next_line_note                PARAMS ((void));
1733 extern void clear_emit_caches                   PARAMS ((void));
1734 extern void init_emit                           PARAMS ((void));
1735 extern void init_emit_once                      PARAMS ((int));
1736 extern void push_topmost_sequence               PARAMS ((void));
1737 extern void pop_topmost_sequence                PARAMS ((void));
1738 extern int subreg_realpart_p                    PARAMS ((rtx));
1739 extern void reverse_comparison                  PARAMS ((rtx));
1740 extern void set_new_first_and_last_insn         PARAMS ((rtx, rtx));
1741 extern void set_new_first_and_last_label_num    PARAMS ((int, int));
1742 extern void set_new_last_label_num              PARAMS ((int));
1743 extern void unshare_all_rtl_again               PARAMS ((rtx));
1744 extern void set_last_insn                       PARAMS ((rtx));
1745 extern void link_cc0_insns                      PARAMS ((rtx));
1746 extern void add_insn                            PARAMS ((rtx));
1747 extern void add_insn_before                     PARAMS ((rtx, rtx));
1748 extern void add_insn_after                      PARAMS ((rtx, rtx));
1749 extern void remove_insn                         PARAMS ((rtx));
1750 extern void reorder_insns_with_line_notes       PARAMS ((rtx, rtx, rtx));
1751 extern void emit_insn_after_with_line_notes     PARAMS ((rtx, rtx, rtx));
1752 extern enum rtx_code classify_insn              PARAMS ((rtx));
1753 extern rtx emit                                 PARAMS ((rtx));
1754 /* Query and clear/ restore no_line_numbers.  This is used by the
1755    switch / case handling in stmt.c to give proper line numbers in
1756    warnings about unreachable code.  */
1757 int force_line_numbers PARAMS ((void));
1758 void restore_line_number_status PARAMS ((int old_value));
1759 extern void renumber_insns                      PARAMS ((FILE *));
1760 extern void remove_unnecessary_notes             PARAMS ((void));
1761
1762 /* In combine.c */
1763 extern int combine_instructions         PARAMS ((rtx, unsigned int));
1764 extern unsigned int extended_count      PARAMS ((rtx, enum machine_mode, int));
1765 extern rtx remove_death                 PARAMS ((unsigned int, rtx));
1766 #ifdef BUFSIZ
1767 extern void dump_combine_stats          PARAMS ((FILE *));
1768 extern void dump_combine_total_stats    PARAMS ((FILE *));
1769 #endif
1770
1771 /* In sched.c. */
1772 #ifdef BUFSIZ
1773 extern void schedule_insns              PARAMS ((FILE *));
1774 extern void schedule_ebbs               PARAMS ((FILE *));
1775 #endif
1776 extern void fix_sched_param             PARAMS ((const char *, const char *));
1777
1778 /* In print-rtl.c */
1779 extern const char *print_rtx_head;
1780 extern void debug_rtx                   PARAMS ((rtx));
1781 extern void debug_rtx_list              PARAMS ((rtx, int));
1782 extern void debug_rtx_range             PARAMS ((rtx, rtx));
1783 extern rtx debug_rtx_find               PARAMS ((rtx, int));
1784 #ifdef BUFSIZ
1785 extern void print_rtl                   PARAMS ((FILE *, rtx));
1786 extern void print_simple_rtl            PARAMS ((FILE *, rtx));
1787 extern int print_rtl_single             PARAMS ((FILE *, rtx));
1788 extern void print_inline_rtx            PARAMS ((FILE *, rtx, int));
1789 #endif
1790
1791 /* In loop.c */
1792 extern void init_loop                   PARAMS ((void));
1793 extern rtx libcall_other_reg            PARAMS ((rtx, rtx));
1794 #ifdef BUFSIZ
1795 extern void loop_optimize               PARAMS ((rtx, FILE *, int));
1796 #endif
1797 extern void record_excess_regs          PARAMS ((rtx, rtx, rtx *));
1798
1799 /* In function.c */
1800 extern void reposition_prologue_and_epilogue_notes      PARAMS ((rtx));
1801 extern void thread_prologue_and_epilogue_insns          PARAMS ((rtx));
1802 extern int prologue_epilogue_contains                   PARAMS ((rtx));
1803 extern int sibcall_epilogue_contains                    PARAMS ((rtx));
1804 extern void preserve_rtl_expr_result                    PARAMS ((rtx));
1805 extern void mark_temp_addr_taken                        PARAMS ((rtx));
1806 extern void update_temp_slot_address                    PARAMS ((rtx, rtx));
1807 extern void purge_addressof                             PARAMS ((rtx));
1808 extern void purge_hard_subreg_sets                      PARAMS ((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 profile.c */
1886 extern void init_branch_prob            PARAMS ((const char *));
1887 extern void branch_prob                 PARAMS ((void));
1888 extern void end_branch_prob             PARAMS ((void));
1889 extern void output_func_start_profiler  PARAMS ((void));
1890
1891 /* In reg-stack.c */
1892 #ifdef BUFSIZ
1893 extern void reg_to_stack                PARAMS ((rtx, FILE *));
1894 #endif
1895
1896 /* In fold-const.c */
1897 extern int add_double           PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1898                                          unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1899                                          unsigned HOST_WIDE_INT *,
1900                                          HOST_WIDE_INT *));
1901 extern int neg_double           PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1902                                          unsigned HOST_WIDE_INT *,
1903                                          HOST_WIDE_INT *));
1904 extern int mul_double           PARAMS ((unsigned HOST_WIDE_INT,
1905                                          HOST_WIDE_INT,
1906                                          unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1907                                          unsigned HOST_WIDE_INT *,
1908                                          HOST_WIDE_INT *));
1909 extern void lshift_double       PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1910                                          HOST_WIDE_INT, unsigned int,
1911                                          unsigned HOST_WIDE_INT *,
1912                                          HOST_WIDE_INT *, int));
1913 extern void rshift_double       PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1914                                          HOST_WIDE_INT, unsigned int,
1915                                          unsigned HOST_WIDE_INT *,
1916                                          HOST_WIDE_INT *, int));
1917 extern void lrotate_double      PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1918                                          HOST_WIDE_INT, unsigned int,
1919                                          unsigned HOST_WIDE_INT *,
1920                                          HOST_WIDE_INT *));
1921 extern void rrotate_double      PARAMS ((unsigned HOST_WIDE_INT, HOST_WIDE_INT,
1922                                          HOST_WIDE_INT, unsigned int,
1923                                          unsigned HOST_WIDE_INT *,
1924                                          HOST_WIDE_INT *));
1925
1926 /* In calls.c */
1927 enum libcall_type
1928 {
1929   LCT_NORMAL = 0,
1930   LCT_CONST = 1,
1931   LCT_PURE = 2,
1932   LCT_CONST_MAKE_BLOCK = 3,
1933   LCT_PURE_MAKE_BLOCK = 4,
1934   LCT_NORETURN = 5,
1935   LCT_THROW = 6,
1936   LCT_ALWAYS_RETURN = 7
1937 };
1938
1939 extern void emit_library_call           PARAMS ((rtx, enum libcall_type,
1940                                                  enum machine_mode, int,
1941                                                  ...));
1942 extern rtx emit_library_call_value      PARAMS ((rtx, rtx, enum libcall_type,
1943                                                  enum machine_mode, int,
1944                                                  ...));
1945
1946 /* In unroll.c */
1947 extern int set_dominates_use            PARAMS ((int, int, int, rtx, rtx));
1948
1949 /* In varasm.c */
1950 extern int in_data_section              PARAMS ((void));
1951 extern void init_varasm_once            PARAMS ((void));
1952
1953 /* In rtl.c */
1954 extern void init_rtl                    PARAMS ((void));
1955 extern void traverse_md_constants       PARAMS ((int (*) (void **, void *),
1956                                                  void *));
1957 struct md_constant { char *name, *value; };
1958
1959 #ifdef BUFSIZ
1960 extern int read_skip_spaces             PARAMS ((FILE *));
1961 extern rtx read_rtx                     PARAMS ((FILE *));
1962 #endif
1963
1964 extern const char *read_rtx_filename;
1965 extern int read_rtx_lineno;
1966
1967 /* Redefine abort to report an internal error w/o coredump, and
1968    reporting the location of the error in the source file.  This logic
1969    is duplicated in rtl.h and tree.h because every file that needs the
1970    special abort includes one or both.  toplev.h gets too few files,
1971    system.h gets too many.  */
1972
1973 extern void fancy_abort PARAMS ((const char *, int, const char *))
1974     ATTRIBUTE_NORETURN;
1975 #define abort() fancy_abort (__FILE__, __LINE__, __FUNCTION__)
1976
1977 /* In alias.c */
1978 extern rtx canon_rtx                    PARAMS ((rtx));
1979 extern int true_dependence              PARAMS ((rtx, enum machine_mode, rtx,
1980                                                 int (*)(rtx, int)));
1981 extern rtx get_addr                     PARAMS ((rtx));
1982 extern int canon_true_dependence        PARAMS ((rtx, enum machine_mode, rtx,
1983                                                 rtx, int (*)(rtx, int)));
1984 extern int read_dependence              PARAMS ((rtx, rtx));
1985 extern int anti_dependence              PARAMS ((rtx, rtx));
1986 extern int output_dependence            PARAMS ((rtx, rtx));
1987 extern void mark_constant_function      PARAMS ((void));
1988 extern void init_alias_once             PARAMS ((void));
1989 extern void init_alias_analysis         PARAMS ((void));
1990 extern void end_alias_analysis          PARAMS ((void));
1991 extern rtx addr_side_effect_eval        PARAMS ((rtx, int, int));
1992 extern void set_mem_alias_set           PARAMS ((rtx, HOST_WIDE_INT));
1993
1994 /* In sibcall.c */
1995 typedef enum {
1996   sibcall_use_normal = 1,
1997   sibcall_use_tail_recursion,
1998   sibcall_use_sibcall
1999 } sibcall_use_t;
2000
2001 extern void optimize_sibling_and_tail_recursive_calls PARAMS ((void));
2002 extern void replace_call_placeholder    PARAMS ((rtx, sibcall_use_t));
2003
2004 #ifdef STACK_REGS
2005 extern int stack_regs_mentioned         PARAMS ((rtx insn));
2006 #endif
2007
2008 /* In toplev.c */
2009 extern rtx stack_limit_rtx;
2010
2011 /* In regrename.c */
2012 extern void regrename_optimize          PARAMS ((void));
2013
2014 /* In ifcvt.c */
2015 extern void if_convert                  PARAMS ((int));
2016
2017 /* In predict.c */
2018 extern void invert_br_probabilities     PARAMS ((rtx));
2019 extern bool expensive_function_p        PARAMS ((int));
2020 #endif /* ! GCC_RTL_H */