gcc/rtl.h

   1 /* Register Transfer Language (RTL) definitions for GCC
   2    Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_RTL_H
  23 #define GCC_RTL_H
  24
  25 #include "statistics.h"
  26 #include "machmode.h"
  27 #include "input.h"
  28 #include "real.h"
  29 #include "vec.h"
  30 #include "vecir.h"
  31 #include "fixed-value.h"
  32 #include "alias.h"
  33 #include "hashtab.h"
  34 #include "flags.h"
  35
  36 /* Value used by some passes to "recognize" noop moves as valid
  37  instructions.  */
  38 #define NOOP_MOVE_INSN_CODE     INT_MAX
  39
  40 /* Register Transfer Language EXPRESSIONS CODES */
  41
  42 #define RTX_CODE        enum rtx_code
  43 enum rtx_code  {
  44
  45 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
  46 #include "rtl.def"              /* rtl expressions are documented here */
  47 #undef DEF_RTL_EXPR
  48
  49   LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
  50                                    NUM_RTX_CODE.
  51                                    Assumes default enum value assignment.  */
  52
  53 /* The cast here, saves many elsewhere.  */
  54 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
  55
  56 /* Similar, but since generator files get more entries... */
  57 #ifdef GENERATOR_FILE
  58 # define NON_GENERATOR_NUM_RTX_CODE ((int) MATCH_OPERAND)
  59 #endif
  60
  61 /* Register Transfer Language EXPRESSIONS CODE CLASSES */
  62
  63 enum rtx_class  {
  64   /* We check bit 0-1 of some rtx class codes in the predicates below.  */
  65
  66   /* Bit 0 = comparison if 0, arithmetic is 1
  67      Bit 1 = 1 if commutative.  */
  68   RTX_COMPARE,          /* 0 */
  69   RTX_COMM_COMPARE,
  70   RTX_BIN_ARITH,
  71   RTX_COMM_ARITH,
  72
  73   /* Must follow the four preceding values.  */
  74   RTX_UNARY,            /* 4 */
  75
  76   RTX_EXTRA,
  77   RTX_MATCH,
  78   RTX_INSN,
  79
  80   /* Bit 0 = 1 if constant.  */
  81   RTX_OBJ,              /* 8 */
  82   RTX_CONST_OBJ,
  83
  84   RTX_TERNARY,
  85   RTX_BITFIELD_OPS,
  86   RTX_AUTOINC
  87 };
  88
  89 #define RTX_OBJ_MASK (~1)
  90 #define RTX_OBJ_RESULT (RTX_OBJ & RTX_OBJ_MASK)
  91 #define RTX_COMPARE_MASK (~1)
  92 #define RTX_COMPARE_RESULT (RTX_COMPARE & RTX_COMPARE_MASK)
  93 #define RTX_ARITHMETIC_MASK (~1)
  94 #define RTX_ARITHMETIC_RESULT (RTX_COMM_ARITH & RTX_ARITHMETIC_MASK)
  95 #define RTX_BINARY_MASK (~3)
  96 #define RTX_BINARY_RESULT (RTX_COMPARE & RTX_BINARY_MASK)
  97 #define RTX_COMMUTATIVE_MASK (~2)
  98 #define RTX_COMMUTATIVE_RESULT (RTX_COMM_COMPARE & RTX_COMMUTATIVE_MASK)
  99 #define RTX_NON_COMMUTATIVE_RESULT (RTX_COMPARE & RTX_COMMUTATIVE_MASK)
 100
 101 extern const unsigned char rtx_length[NUM_RTX_CODE];
 102 #define GET_RTX_LENGTH(CODE)            (rtx_length[(int) (CODE)])
 103
 104 extern const char * const rtx_name[NUM_RTX_CODE];
 105 #define GET_RTX_NAME(CODE)              (rtx_name[(int) (CODE)])
 106
 107 extern const char * const rtx_format[NUM_RTX_CODE];
 108 #define GET_RTX_FORMAT(CODE)            (rtx_format[(int) (CODE)])
 109
 110 extern const enum rtx_class rtx_class[NUM_RTX_CODE];
 111 #define GET_RTX_CLASS(CODE)             (rtx_class[(int) (CODE)])
 112
 113 extern const unsigned char rtx_code_size[NUM_RTX_CODE];
 114 extern const unsigned char rtx_next[NUM_RTX_CODE];
 115 \f
 116 /* The flags and bitfields of an ADDR_DIFF_VEC.  BASE is the base label
 117    relative to which the offsets are calculated, as explained in rtl.def.  */
 118 typedef struct
 119 {
 120   /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
 121   unsigned min_align: 8;
 122   /* Flags: */
 123   unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC.  */
 124   unsigned min_after_vec: 1;  /* minimum address target label is
 125                                  after the ADDR_DIFF_VEC.  */
 126   unsigned max_after_vec: 1;  /* maximum address target label is
 127                                  after the ADDR_DIFF_VEC.  */
 128   unsigned min_after_base: 1; /* minimum address target label is
 129                                  after BASE.  */
 130   unsigned max_after_base: 1; /* maximum address target label is
 131                                  after BASE.  */
 132   /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
 133   unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned.  */
 134   unsigned : 2;
 135   unsigned scale : 8;
 136 } addr_diff_vec_flags;
 137
 138 /* Structure used to describe the attributes of a MEM.  These are hashed
 139    so MEMs that the same attributes share a data structure.  This means
 140    they cannot be modified in place.  */
 141 typedef struct GTY(()) mem_attrs
 142 {
 143   /* The expression that the MEM accesses, or null if not known.
 144      This expression might be larger than the memory reference itself.
 145      (In other words, the MEM might access only part of the object.)  */
 146   tree expr;
 147
 148   /* The offset of the memory reference from the start of EXPR.
 149      Only valid if OFFSET_KNOWN_P.  */
 150   HOST_WIDE_INT offset;
 151
 152   /* The size of the memory reference in bytes.  Only valid if
 153      SIZE_KNOWN_P.  */
 154   HOST_WIDE_INT size;
 155
 156   /* The alias set of the memory reference.  */
 157   alias_set_type alias;
 158
 159   /* The alignment of the reference in bits.  Always a multiple of
 160      BITS_PER_UNIT.  Note that EXPR may have a stricter alignment
 161      than the memory reference itself.  */
 162   unsigned int align;
 163
 164   /* The address space that the memory reference uses.  */
 165   unsigned char addrspace;
 166
 167   /* True if OFFSET is known.  */
 168   bool offset_known_p;
 169
 170   /* True if SIZE is known.  */
 171   bool size_known_p;
 172 } mem_attrs;
 173
 174 /* Structure used to describe the attributes of a REG in similar way as
 175    mem_attrs does for MEM above.  Note that the OFFSET field is calculated
 176    in the same way as for mem_attrs, rather than in the same way as a
 177    SUBREG_BYTE.  For example, if a big-endian target stores a byte
 178    object in the low part of a 4-byte register, the OFFSET field
 179    will be -3 rather than 0.  */
 180
 181 typedef struct GTY(()) reg_attrs {
 182   tree decl;                    /* decl corresponding to REG.  */
 183   HOST_WIDE_INT offset;         /* Offset from start of DECL.  */
 184 } reg_attrs;
 185
 186 /* Common union for an element of an rtx.  */
 187
 188 union rtunion_def
 189 {
 190   int rt_int;
 191   unsigned int rt_uint;
 192   const char *rt_str;
 193   rtx rt_rtx;
 194   rtvec rt_rtvec;
 195   enum machine_mode rt_type;
 196   addr_diff_vec_flags rt_addr_diff_vec_flags;
 197   struct cselib_val_struct *rt_cselib;
 198   tree rt_tree;
 199   basic_block rt_bb;
 200   mem_attrs *rt_mem;
 201   reg_attrs *rt_reg;
 202   struct constant_descriptor_rtx *rt_constant;
 203   struct dw_cfi_struct *rt_cfi;
 204 };
 205 typedef union rtunion_def rtunion;
 206
 207 /* This structure remembers the position of a SYMBOL_REF within an
 208    object_block structure.  A SYMBOL_REF only provides this information
 209    if SYMBOL_REF_HAS_BLOCK_INFO_P is true.  */
 210 struct GTY(()) block_symbol {
 211   /* The usual SYMBOL_REF fields.  */
 212   rtunion GTY ((skip)) fld[3];
 213
 214   /* The block that contains this object.  */
 215   struct object_block *block;
 216
 217   /* The offset of this object from the start of its block.  It is negative
 218      if the symbol has not yet been assigned an offset.  */
 219   HOST_WIDE_INT offset;
 220 };
 221
 222 /* Describes a group of objects that are to be placed together in such
 223    a way that their relative positions are known.  */
 224 struct GTY(()) object_block {
 225   /* The section in which these objects should be placed.  */
 226   section *sect;
 227
 228   /* The alignment of the first object, measured in bits.  */
 229   unsigned int alignment;
 230
 231   /* The total size of the objects, measured in bytes.  */
 232   HOST_WIDE_INT size;
 233
 234   /* The SYMBOL_REFs for each object.  The vector is sorted in
 235      order of increasing offset and the following conditions will
 236      hold for each element X:
 237
 238          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 239          !SYMBOL_REF_ANCHOR_P (X)
 240          SYMBOL_REF_BLOCK (X) == [address of this structure]
 241          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 242   VEC(rtx,gc) *objects;
 243
 244   /* All the anchor SYMBOL_REFs used to address these objects, sorted
 245      in order of increasing offset, and then increasing TLS model.
 246      The following conditions will hold for each element X in this vector:
 247
 248          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 249          SYMBOL_REF_ANCHOR_P (X)
 250          SYMBOL_REF_BLOCK (X) == [address of this structure]
 251          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 252   VEC(rtx,gc) *anchors;
 253 };
 254
 255 /* RTL expression ("rtx").  */
 256
 257 struct GTY((chain_next ("RTX_NEXT (&%h)"),
 258             chain_prev ("RTX_PREV (&%h)"), variable_size)) rtx_def {
 259   /* The kind of expression this is.  */
 260   ENUM_BITFIELD(rtx_code) code: 16;
 261
 262   /* The kind of value the expression has.  */
 263   ENUM_BITFIELD(machine_mode) mode : 8;
 264
 265   /* 1 in a MEM if we should keep the alias set for this mem unchanged
 266      when we access a component.
 267      1 in a CALL_INSN if it is a sibling call.
 268      1 in a SET that is for a return.
 269      In a CODE_LABEL, part of the two-bit alternate entry field.
 270      1 in a CONCAT is VAL_EXPR_IS_COPIED in var-tracking.c.
 271      1 in a VALUE is SP_BASED_VALUE_P in cselib.c.  */
 272   unsigned int jump : 1;
 273   /* In a CODE_LABEL, part of the two-bit alternate entry field.
 274      1 in a MEM if it cannot trap.
 275      1 in a CALL_INSN logically equivalent to
 276        ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
 277   unsigned int call : 1;
 278   /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
 279      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 280      1 in a SYMBOL_REF if it addresses something in the per-function
 281      constants pool.
 282      1 in a CALL_INSN logically equivalent to ECF_CONST and TREE_READONLY.
 283      1 in a NOTE, or EXPR_LIST for a const call.
 284      1 in a JUMP_INSN of an annulling branch.
 285      1 in a CONCAT is VAL_EXPR_IS_CLOBBERED in var-tracking.c.
 286      1 in a preserved VALUE is PRESERVED_VALUE_P in cselib.c.
 287      1 in a clobber temporarily created for LRA.  */
 288   unsigned int unchanging : 1;
 289   /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
 290      1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
 291      if it has been deleted.
 292      1 in a REG expression if corresponds to a variable declared by the user,
 293      0 for an internally generated temporary.
 294      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 295      1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
 296      non-local label.
 297      In a SYMBOL_REF, this flag is used for machine-specific purposes.
 298      In a PREFETCH, this flag indicates that it should be considered a scheduling
 299      barrier.
 300      1 in a CONCAT is VAL_NEEDS_RESOLUTION in var-tracking.c.  */
 301   unsigned int volatil : 1;
 302   /* 1 in a REG if the register is used only in exit code a loop.
 303      1 in a SUBREG expression if was generated from a variable with a
 304      promoted mode.
 305      1 in a CODE_LABEL if the label is used for nonlocal gotos
 306      and must not be deleted even if its count is zero.
 307      1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
 308      together with the preceding insn.  Valid only within sched.
 309      1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
 310      from the target of a branch.  Valid from reorg until end of compilation;
 311      cleared before used.
 312
 313      The name of the field is historical.  It used to be used in MEMs
 314      to record whether the MEM accessed part of a structure.  */
 315   unsigned int in_struct : 1;
 316   /* At the end of RTL generation, 1 if this rtx is used.  This is used for
 317      copying shared structure.  See `unshare_all_rtl'.
 318      In a REG, this is not needed for that purpose, and used instead
 319      in `leaf_renumber_regs_insn'.
 320      1 in a SYMBOL_REF, means that emit_library_call
 321      has used it as the function.
 322      1 in a CONCAT is VAL_HOLDS_TRACK_EXPR in var-tracking.c.
 323      1 in a VALUE or DEBUG_EXPR is VALUE_RECURSED_INTO in var-tracking.c.  */
 324   unsigned int used : 1;
 325   /* 1 in an INSN or a SET if this rtx is related to the call frame,
 326      either changing how we compute the frame address or saving and
 327      restoring registers in the prologue and epilogue.
 328      1 in a REG or MEM if it is a pointer.
 329      1 in a SYMBOL_REF if it addresses something in the per-function
 330      constant string pool.
 331      1 in a VALUE is VALUE_CHANGED in var-tracking.c.  */
 332   unsigned frame_related : 1;
 333   /* 1 in a REG or PARALLEL that is the current function's return value.
 334      1 in a SYMBOL_REF for a weak symbol.
 335      1 in a CALL_INSN logically equivalent to ECF_PURE and DECL_PURE_P.
 336      1 in a CONCAT is VAL_EXPR_HAS_REVERSE in var-tracking.c.
 337      1 in a VALUE or DEBUG_EXPR is NO_LOC_P in var-tracking.c.  */
 338   unsigned return_val : 1;
 339
 340   /* The first element of the operands of this rtx.
 341      The number of operands and their types are controlled
 342      by the `code' field, according to rtl.def.  */
 343   union u {
 344     rtunion fld[1];
 345     HOST_WIDE_INT hwint[1];
 346     struct block_symbol block_sym;
 347     struct real_value rv;
 348     struct fixed_value fv;
 349   } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
 350 };
 351
 352 /* The size in bytes of an rtx header (code, mode and flags).  */
 353 #define RTX_HDR_SIZE offsetof (struct rtx_def, u)
 354
 355 /* The size in bytes of an rtx with code CODE.  */
 356 #define RTX_CODE_SIZE(CODE) rtx_code_size[CODE]
 357
 358 #define NULL_RTX (rtx) 0
 359
 360 /* The "next" and "previous" RTX, relative to this one.  */
 361
 362 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL                 \
 363                      : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
 364
 365 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
 366  */
 367 #define RTX_PREV(X) ((INSN_P (X)                        \
 368                       || NOTE_P (X)                     \
 369                       || BARRIER_P (X)                  \
 370                       || LABEL_P (X))                   \
 371                      && PREV_INSN (X) != NULL           \
 372                      && NEXT_INSN (PREV_INSN (X)) == X  \
 373                      ? PREV_INSN (X) : NULL)
 374
 375 /* Define macros to access the `code' field of the rtx.  */
 376
 377 #define GET_CODE(RTX)       ((enum rtx_code) (RTX)->code)
 378 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
 379
 380 #define GET_MODE(RTX)       ((enum machine_mode) (RTX)->mode)
 381 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
 382
 383 /* RTL vector.  These appear inside RTX's when there is a need
 384    for a variable number of things.  The principle use is inside
 385    PARALLEL expressions.  */
 386
 387 struct GTY((variable_size)) rtvec_def {
 388   int num_elem;         /* number of elements */
 389   rtx GTY ((length ("%h.num_elem"))) elem[1];
 390 };
 391
 392 #define NULL_RTVEC (rtvec) 0
 393
 394 #define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
 395 #define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (NUM))
 396
 397 /* Predicate yielding nonzero iff X is an rtx for a register.  */
 398 #define REG_P(X) (GET_CODE (X) == REG)
 399
 400 /* Predicate yielding nonzero iff X is an rtx for a memory location.  */
 401 #define MEM_P(X) (GET_CODE (X) == MEM)
 402
 403 /* Match CONST_*s that can represent compile-time constant integers.  */
 404 #define CASE_CONST_SCALAR_INT \
 405    case CONST_INT: \
 406    case CONST_DOUBLE
 407
 408 /* Match CONST_*s for which pointer equality corresponds to value equality.  */
 409 #define CASE_CONST_UNIQUE \
 410    case CONST_INT: \
 411    case CONST_DOUBLE: \
 412    case CONST_FIXED
 413
 414 /* Match all CONST_* rtxes.  */
 415 #define CASE_CONST_ANY \
 416    case CONST_INT: \
 417    case CONST_DOUBLE: \
 418    case CONST_FIXED: \
 419    case CONST_VECTOR
 420
 421 /* Predicate yielding nonzero iff X is an rtx for a constant integer.  */
 422 #define CONST_INT_P(X) (GET_CODE (X) == CONST_INT)
 423
 424 /* Predicate yielding nonzero iff X is an rtx for a constant fixed-point.  */
 425 #define CONST_FIXED_P(X) (GET_CODE (X) == CONST_FIXED)
 426
 427 /* Predicate yielding true iff X is an rtx for a double-int
 428    or floating point constant.  */
 429 #define CONST_DOUBLE_P(X) (GET_CODE (X) == CONST_DOUBLE)
 430
 431 /* Predicate yielding true iff X is an rtx for a double-int.  */
 432 #define CONST_DOUBLE_AS_INT_P(X) \
 433   (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == VOIDmode)
 434
 435 /* Predicate yielding true iff X is an rtx for a integer const.  */
 436 #define CONST_SCALAR_INT_P(X) \
 437   (CONST_INT_P (X) || CONST_DOUBLE_AS_INT_P (X))
 438
 439 /* Predicate yielding true iff X is an rtx for a double-int.  */
 440 #define CONST_DOUBLE_AS_FLOAT_P(X) \
 441   (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode)
 442
 443 /* Predicate yielding nonzero iff X is a label insn.  */
 444 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
 445
 446 /* Predicate yielding nonzero iff X is a jump insn.  */
 447 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
 448
 449 /* Predicate yielding nonzero iff X is a call insn.  */
 450 #define CALL_P(X) (GET_CODE (X) == CALL_INSN)
 451
 452 /* Predicate yielding nonzero iff X is an insn that cannot jump.  */
 453 #define NONJUMP_INSN_P(X) (GET_CODE (X) == INSN)
 454
 455 /* Predicate yielding nonzero iff X is a debug note/insn.  */
 456 #define DEBUG_INSN_P(X) (GET_CODE (X) == DEBUG_INSN)
 457
 458 /* Predicate yielding nonzero iff X is an insn that is not a debug insn.  */
 459 #define NONDEBUG_INSN_P(X) (INSN_P (X) && !DEBUG_INSN_P (X))
 460
 461 /* Nonzero if DEBUG_INSN_P may possibly hold.  */
 462 #define MAY_HAVE_DEBUG_INSNS (flag_var_tracking_assignments)
 463
 464 /* Predicate yielding nonzero iff X is a real insn.  */
 465 #define INSN_P(X) \
 466   (NONJUMP_INSN_P (X) || DEBUG_INSN_P (X) || JUMP_P (X) || CALL_P (X))
 467
 468 /* Predicate yielding nonzero iff X is a note insn.  */
 469 #define NOTE_P(X) (GET_CODE (X) == NOTE)
 470
 471 /* Predicate yielding nonzero iff X is a barrier insn.  */
 472 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
 473
 474 /* Predicate yielding nonzero iff X is a data for a jump table.  */
 475 #define JUMP_TABLE_DATA_P(INSN) \
 476   (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
 477                      GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
 478
 479 /* Predicate yielding nonzero iff X is a return or simple_return.  */
 480 #define ANY_RETURN_P(X) \
 481   (GET_CODE (X) == RETURN || GET_CODE (X) == SIMPLE_RETURN)
 482
 483 /* 1 if X is a unary operator.  */
 484
 485 #define UNARY_P(X)   \
 486   (GET_RTX_CLASS (GET_CODE (X)) == RTX_UNARY)
 487
 488 /* 1 if X is a binary operator.  */
 489
 490 #define BINARY_P(X)   \
 491   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_BINARY_MASK) == RTX_BINARY_RESULT)
 492
 493 /* 1 if X is an arithmetic operator.  */
 494
 495 #define ARITHMETIC_P(X)   \
 496   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_ARITHMETIC_MASK)                 \
 497     == RTX_ARITHMETIC_RESULT)
 498
 499 /* 1 if X is an arithmetic operator.  */
 500
 501 #define COMMUTATIVE_ARITH_P(X)   \
 502   (GET_RTX_CLASS (GET_CODE (X)) == RTX_COMM_ARITH)
 503
 504 /* 1 if X is a commutative arithmetic operator or a comparison operator.
 505    These two are sometimes selected together because it is possible to
 506    swap the two operands.  */
 507
 508 #define SWAPPABLE_OPERANDS_P(X)   \
 509   ((1 << GET_RTX_CLASS (GET_CODE (X)))                                  \
 510     & ((1 << RTX_COMM_ARITH) | (1 << RTX_COMM_COMPARE)                  \
 511        | (1 << RTX_COMPARE)))
 512
 513 /* 1 if X is a non-commutative operator.  */
 514
 515 #define NON_COMMUTATIVE_P(X)   \
 516   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 517     == RTX_NON_COMMUTATIVE_RESULT)
 518
 519 /* 1 if X is a commutative operator on integers.  */
 520
 521 #define COMMUTATIVE_P(X)   \
 522   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 523     == RTX_COMMUTATIVE_RESULT)
 524
 525 /* 1 if X is a relational operator.  */
 526
 527 #define COMPARISON_P(X)   \
 528   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMPARE_MASK) == RTX_COMPARE_RESULT)
 529
 530 /* 1 if X is a constant value that is an integer.  */
 531
 532 #define CONSTANT_P(X)   \
 533   (GET_RTX_CLASS (GET_CODE (X)) == RTX_CONST_OBJ)
 534
 535 /* 1 if X can be used to represent an object.  */
 536 #define OBJECT_P(X)                                                     \
 537   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_OBJ_MASK) == RTX_OBJ_RESULT)
 538
 539 /* General accessor macros for accessing the fields of an rtx.  */
 540
 541 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 542 /* The bit with a star outside the statement expr and an & inside is
 543    so that N can be evaluated only once.  */
 544 #define RTL_CHECK1(RTX, N, C1) __extension__                            \
 545 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 546      const enum rtx_code _code = GET_CODE (_rtx);                       \
 547      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 548        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 549                                 __FUNCTION__);                          \
 550      if (GET_RTX_FORMAT(_code)[_n] != C1)                               \
 551        rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__,        \
 552                                __FUNCTION__);                           \
 553      &_rtx->u.fld[_n]; }))
 554
 555 #define RTL_CHECK2(RTX, N, C1, C2) __extension__                        \
 556 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 557      const enum rtx_code _code = GET_CODE (_rtx);                       \
 558      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 559        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 560                                 __FUNCTION__);                          \
 561      if (GET_RTX_FORMAT(_code)[_n] != C1                                \
 562          && GET_RTX_FORMAT(_code)[_n] != C2)                            \
 563        rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__,    \
 564                                __FUNCTION__);                           \
 565      &_rtx->u.fld[_n]; }))
 566
 567 #define RTL_CHECKC1(RTX, N, C) __extension__                            \
 568 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 569      if (GET_CODE (_rtx) != (C))                                        \
 570        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 571                                __FUNCTION__);                           \
 572      &_rtx->u.fld[_n]; }))
 573
 574 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__                       \
 575 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 576      const enum rtx_code _code = GET_CODE (_rtx);                       \
 577      if (_code != (C1) && _code != (C2))                                \
 578        rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__,    \
 579                                __FUNCTION__); \
 580      &_rtx->u.fld[_n]; }))
 581
 582 #define RTVEC_ELT(RTVEC, I) __extension__                               \
 583 (*({ __typeof (RTVEC) const _rtvec = (RTVEC); const int _i = (I);       \
 584      if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec))                         \
 585        rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__,       \
 586                                   __FUNCTION__);                        \
 587      &_rtvec->elem[_i]; }))
 588
 589 #define XWINT(RTX, N) __extension__                                     \
 590 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 591      const enum rtx_code _code = GET_CODE (_rtx);                       \
 592      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 593        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 594                                 __FUNCTION__);                          \
 595      if (GET_RTX_FORMAT(_code)[_n] != 'w')                              \
 596        rtl_check_failed_type1 (_rtx, _n, 'w', __FILE__, __LINE__,       \
 597                                __FUNCTION__);                           \
 598      &_rtx->u.hwint[_n]; }))
 599
 600 #define XCWINT(RTX, N, C) __extension__                                 \
 601 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 602      if (GET_CODE (_rtx) != (C))                                        \
 603        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 604                                __FUNCTION__);                           \
 605      &_rtx->u.hwint[N]; }))
 606
 607 #define XCMWINT(RTX, N, C, M) __extension__                             \
 608 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 609      if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) != (M))              \
 610        rtl_check_failed_code_mode (_rtx, (C), (M), false, __FILE__,     \
 611                                    __LINE__, __FUNCTION__);             \
 612      &_rtx->u.hwint[N]; }))
 613
 614 #define XCNMPRV(RTX, C, M) __extension__                                \
 615 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 616    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 617      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 618                                  __LINE__, __FUNCTION__);               \
 619    &_rtx->u.rv; })
 620
 621 #define XCNMPFV(RTX, C, M) __extension__                                \
 622 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 623    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 624      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 625                                  __LINE__, __FUNCTION__);               \
 626    &_rtx->u.fv; })
 627
 628 #define BLOCK_SYMBOL_CHECK(RTX) __extension__                           \
 629 ({ __typeof (RTX) const _symbol = (RTX);                                \
 630    const unsigned int flags = RTL_CHECKC1 (_symbol, 1, SYMBOL_REF).rt_int; \
 631    if ((flags & SYMBOL_FLAG_HAS_BLOCK_INFO) == 0)                       \
 632      rtl_check_failed_block_symbol (__FILE__, __LINE__,                 \
 633                                     __FUNCTION__);                      \
 634    &_symbol->u.block_sym; })
 635
 636 extern void rtl_check_failed_bounds (const_rtx, int, const char *, int,
 637                                      const char *)
 638     ATTRIBUTE_NORETURN;
 639 extern void rtl_check_failed_type1 (const_rtx, int, int, const char *, int,
 640                                     const char *)
 641     ATTRIBUTE_NORETURN;
 642 extern void rtl_check_failed_type2 (const_rtx, int, int, int, const char *,
 643                                     int, const char *)
 644     ATTRIBUTE_NORETURN;
 645 extern void rtl_check_failed_code1 (const_rtx, enum rtx_code, const char *,
 646                                     int, const char *)
 647     ATTRIBUTE_NORETURN;
 648 extern void rtl_check_failed_code2 (const_rtx, enum rtx_code, enum rtx_code,
 649                                     const char *, int, const char *)
 650     ATTRIBUTE_NORETURN;
 651 extern void rtl_check_failed_code_mode (const_rtx, enum rtx_code, enum machine_mode,
 652                                         bool, const char *, int, const char *)
 653     ATTRIBUTE_NORETURN;
 654 extern void rtl_check_failed_block_symbol (const char *, int, const char *)
 655     ATTRIBUTE_NORETURN;
 656 extern void rtvec_check_failed_bounds (const_rtvec, int, const char *, int,
 657                                        const char *)
 658     ATTRIBUTE_NORETURN;
 659
 660 #else   /* not ENABLE_RTL_CHECKING */
 661
 662 #define RTL_CHECK1(RTX, N, C1)      ((RTX)->u.fld[N])
 663 #define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->u.fld[N])
 664 #define RTL_CHECKC1(RTX, N, C)      ((RTX)->u.fld[N])
 665 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->u.fld[N])
 666 #define RTVEC_ELT(RTVEC, I)         ((RTVEC)->elem[I])
 667 #define XWINT(RTX, N)               ((RTX)->u.hwint[N])
 668 #define XCWINT(RTX, N, C)           ((RTX)->u.hwint[N])
 669 #define XCMWINT(RTX, N, C, M)       ((RTX)->u.hwint[N])
 670 #define XCNMWINT(RTX, N, C, M)      ((RTX)->u.hwint[N])
 671 #define XCNMPRV(RTX, C, M)          (&(RTX)->u.rv)
 672 #define XCNMPFV(RTX, C, M)          (&(RTX)->u.fv)
 673 #define BLOCK_SYMBOL_CHECK(RTX)     (&(RTX)->u.block_sym)
 674
 675 #endif
 676
 677 /* General accessor macros for accessing the flags of an rtx.  */
 678
 679 /* Access an individual rtx flag, with no checking of any kind.  */
 680 #define RTX_FLAG(RTX, FLAG)     ((RTX)->FLAG)
 681
 682 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
 683 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__                    \
 684 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 685    if (GET_CODE(_rtx) != C1)                                            \
 686      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 687                              __FUNCTION__);                             \
 688    _rtx; })
 689
 690 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__                \
 691 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 692    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2)                    \
 693      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 694                               __FUNCTION__);                            \
 695    _rtx; })
 696
 697 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__            \
 698 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 699    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 700        && GET_CODE(_rtx) != C3)                                         \
 701      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 702                              __FUNCTION__);                             \
 703    _rtx; })
 704
 705 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__        \
 706 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 707    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 708        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4)                 \
 709      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 710                               __FUNCTION__);                            \
 711    _rtx; })
 712
 713 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__    \
 714 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 715    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 716        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 717        && GET_CODE(_rtx) != C5)                                         \
 718      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 719                              __FUNCTION__);                             \
 720    _rtx; })
 721
 722 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              \
 723   __extension__                                                         \
 724 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 725    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 726        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 727        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6)                 \
 728      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 729                              __FUNCTION__);                             \
 730    _rtx; })
 731
 732 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          \
 733   __extension__                                                         \
 734 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 735    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 736        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 737        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6                  \
 738        && GET_CODE(_rtx) != C7)                                         \
 739      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 740                              __FUNCTION__);                             \
 741    _rtx; })
 742
 743 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      \
 744   __extension__                                                         \
 745 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 746    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 747        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 748        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6                  \
 749        && GET_CODE(_rtx) != C7 && GET_CODE(_rtx) != C8)                 \
 750      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 751                              __FUNCTION__);                             \
 752    _rtx; })
 753
 754 extern void rtl_check_failed_flag (const char *, const_rtx, const char *,
 755                                    int, const char *)
 756     ATTRIBUTE_NORETURN
 757     ;
 758
 759 #else   /* not ENABLE_RTL_FLAG_CHECKING */
 760
 761 #define RTL_FLAG_CHECK1(NAME, RTX, C1)                                  (RTX)
 762 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2)                              (RTX)
 763 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3)                          (RTX)
 764 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4)                      (RTX)
 765 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5)          (RTX)
 766 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              (RTX)
 767 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          (RTX)
 768 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      (RTX)
 769 #endif
 770
 771 #define XINT(RTX, N)    (RTL_CHECK2 (RTX, N, 'i', 'n').rt_int)
 772 #define XUINT(RTX, N)   (RTL_CHECK2 (RTX, N, 'i', 'n').rt_uint)
 773 #define XSTR(RTX, N)    (RTL_CHECK2 (RTX, N, 's', 'S').rt_str)
 774 #define XEXP(RTX, N)    (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
 775 #define XVEC(RTX, N)    (RTL_CHECK2 (RTX, N, 'E', 'V').rt_rtvec)
 776 #define XMODE(RTX, N)   (RTL_CHECK1 (RTX, N, 'M').rt_type)
 777 #define XTREE(RTX, N)   (RTL_CHECK1 (RTX, N, 't').rt_tree)
 778 #define XBBDEF(RTX, N)  (RTL_CHECK1 (RTX, N, 'B').rt_bb)
 779 #define XTMPL(RTX, N)   (RTL_CHECK1 (RTX, N, 'T').rt_str)
 780 #define XCFI(RTX, N)    (RTL_CHECK1 (RTX, N, 'C').rt_cfi)
 781
 782 #define XVECEXP(RTX, N, M)      RTVEC_ELT (XVEC (RTX, N), M)
 783 #define XVECLEN(RTX, N)         GET_NUM_ELEM (XVEC (RTX, N))
 784
 785 /* These are like XINT, etc. except that they expect a '0' field instead
 786    of the normal type code.  */
 787
 788 #define X0INT(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_int)
 789 #define X0UINT(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_uint)
 790 #define X0STR(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_str)
 791 #define X0EXP(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtx)
 792 #define X0VEC(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtvec)
 793 #define X0MODE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_type)
 794 #define X0TREE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_tree)
 795 #define X0BBDEF(RTX, N)    (RTL_CHECK1 (RTX, N, '0').rt_bb)
 796 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
 797 #define X0CSELIB(RTX, N)   (RTL_CHECK1 (RTX, N, '0').rt_cselib)
 798 #define X0MEMATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, MEM).rt_mem)
 799 #define X0REGATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, REG).rt_reg)
 800 #define X0CONSTANT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_constant)
 801
 802 /* Access a '0' field with any type.  */
 803 #define X0ANY(RTX, N)      RTL_CHECK1 (RTX, N, '0')
 804
 805 #define XCINT(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_int)
 806 #define XCUINT(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_uint)
 807 #define XCSTR(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_str)
 808 #define XCEXP(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtx)
 809 #define XCVEC(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtvec)
 810 #define XCMODE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_type)
 811 #define XCTREE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_tree)
 812 #define XCBBDEF(RTX, N, C)    (RTL_CHECKC1 (RTX, N, C).rt_bb)
 813 #define XCCFI(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_cfi)
 814 #define XCCSELIB(RTX, N, C)   (RTL_CHECKC1 (RTX, N, C).rt_cselib)
 815
 816 #define XCVECEXP(RTX, N, M, C)  RTVEC_ELT (XCVEC (RTX, N, C), M)
 817 #define XCVECLEN(RTX, N, C)     GET_NUM_ELEM (XCVEC (RTX, N, C))
 818
 819 #define XC2EXP(RTX, N, C1, C2)      (RTL_CHECKC2 (RTX, N, C1, C2).rt_rtx)
 820 \f
 821 /* ACCESS MACROS for particular fields of insns.  */
 822
 823 /* Holds a unique number for each insn.
 824    These are not necessarily sequentially increasing.  */
 825 #define INSN_UID(INSN)  XINT (INSN, 0)
 826
 827 /* Chain insns together in sequence.  */
 828 #define PREV_INSN(INSN) XEXP (INSN, 1)
 829 #define NEXT_INSN(INSN) XEXP (INSN, 2)
 830
 831 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
 832
 833 /* The body of an insn.  */
 834 #define PATTERN(INSN)   XEXP (INSN, 4)
 835
 836 #define INSN_LOCATION(INSN) XUINT (INSN, 5)
 837
 838 #define INSN_HAS_LOCATION(INSN) ((LOCATION_LOCUS (INSN_LOCATION (INSN)))\
 839   != UNKNOWN_LOCATION)
 840
 841 /* LOCATION of an RTX if relevant.  */
 842 #define RTL_LOCATION(X) (INSN_P (X) ? \
 843                          INSN_LOCATION (X) : UNKNOWN_LOCATION)
 844
 845 /* Code number of instruction, from when it was recognized.
 846    -1 means this instruction has not been recognized yet.  */
 847 #define INSN_CODE(INSN) XINT (INSN, 6)
 848
 849 #define RTX_FRAME_RELATED_P(RTX)                                        \
 850   (RTL_FLAG_CHECK6("RTX_FRAME_RELATED_P", (RTX), DEBUG_INSN, INSN,      \
 851                    CALL_INSN, JUMP_INSN, BARRIER, SET)->frame_related)
 852
 853 /* 1 if RTX is an insn that has been deleted.  */
 854 #define INSN_DELETED_P(RTX)                                             \
 855   (RTL_FLAG_CHECK7("INSN_DELETED_P", (RTX), DEBUG_INSN, INSN,           \
 856                    CALL_INSN, JUMP_INSN,                                \
 857                    CODE_LABEL, BARRIER, NOTE)->volatil)
 858
 859 /* 1 if RTX is a call to a const function.  Built from ECF_CONST and
 860    TREE_READONLY.  */
 861 #define RTL_CONST_CALL_P(RTX)                                   \
 862   (RTL_FLAG_CHECK1("RTL_CONST_CALL_P", (RTX), CALL_INSN)->unchanging)
 863
 864 /* 1 if RTX is a call to a pure function.  Built from ECF_PURE and
 865    DECL_PURE_P.  */
 866 #define RTL_PURE_CALL_P(RTX)                                    \
 867   (RTL_FLAG_CHECK1("RTL_PURE_CALL_P", (RTX), CALL_INSN)->return_val)
 868
 869 /* 1 if RTX is a call to a const or pure function.  */
 870 #define RTL_CONST_OR_PURE_CALL_P(RTX) \
 871   (RTL_CONST_CALL_P(RTX) || RTL_PURE_CALL_P(RTX))
 872
 873 /* 1 if RTX is a call to a looping const or pure function.  Built from
 874    ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P.  */
 875 #define RTL_LOOPING_CONST_OR_PURE_CALL_P(RTX)                                   \
 876   (RTL_FLAG_CHECK1("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN)->call)
 877
 878 /* 1 if RTX is a call_insn for a sibling call.  */
 879 #define SIBLING_CALL_P(RTX)                                             \
 880   (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
 881
 882 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch.  */
 883 #define INSN_ANNULLED_BRANCH_P(RTX)                                     \
 884   (RTL_FLAG_CHECK1("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN)->unchanging)
 885
 886 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
 887    If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
 888    executed if the branch is taken.  For annulled branches with this bit
 889    clear, the insn should be executed only if the branch is not taken.  */
 890 #define INSN_FROM_TARGET_P(RTX)                                         \
 891   (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
 892
 893 /* In an ADDR_DIFF_VEC, the flags for RTX for use by branch shortening.
 894    See the comments for ADDR_DIFF_VEC in rtl.def.  */
 895 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
 896
 897 /* In a VALUE, the value cselib has assigned to RTX.
 898    This is a "struct cselib_val_struct", see cselib.h.  */
 899 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
 900
 901 /* Holds a list of notes on what this insn does to various REGs.
 902    It is a chain of EXPR_LIST rtx's, where the second operand is the
 903    chain pointer and the first operand is the REG being described.
 904    The mode field of the EXPR_LIST contains not a real machine mode
 905    but a value from enum reg_note.  */
 906 #define REG_NOTES(INSN) XEXP(INSN, 7)
 907
 908 /* In an ENTRY_VALUE this is the DECL_INCOMING_RTL of the argument in
 909    question.  */
 910 #define ENTRY_VALUE_EXP(RTX) (RTL_CHECKC1 (RTX, 0, ENTRY_VALUE).rt_rtx)
 911
 912 enum reg_note
 913 {
 914 #define DEF_REG_NOTE(NAME) NAME,
 915 #include "reg-notes.def"
 916 #undef DEF_REG_NOTE
 917   REG_NOTE_MAX
 918 };
 919
 920 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
 921 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
 922 #define PUT_REG_NOTE_KIND(LINK, KIND) \
 923   PUT_MODE (LINK, (enum machine_mode) (KIND))
 924
 925 /* Names for REG_NOTE's in EXPR_LIST insn's.  */
 926
 927 extern const char * const reg_note_name[];
 928 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
 929
 930 /* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
 931    USE and CLOBBER expressions.
 932      USE expressions list the registers filled with arguments that
 933    are passed to the function.
 934      CLOBBER expressions document the registers explicitly clobbered
 935    by this CALL_INSN.
 936      Pseudo registers can not be mentioned in this list.  */
 937 #define CALL_INSN_FUNCTION_USAGE(INSN)  XEXP(INSN, 8)
 938
 939 /* The label-number of a code-label.  The assembler label
 940    is made from `L' and the label-number printed in decimal.
 941    Label numbers are unique in a compilation.  */
 942 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
 943
 944 /* In a NOTE that is a line number, this is a string for the file name that the
 945    line is in.  We use the same field to record block numbers temporarily in
 946    NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.  (We avoid lots of casts
 947    between ints and pointers if we use a different macro for the block number.)
 948    */
 949
 950 /* Opaque data.  */
 951 #define NOTE_DATA(INSN)         RTL_CHECKC1 (INSN, 4, NOTE)
 952 #define NOTE_DELETED_LABEL_NAME(INSN) XCSTR (INSN, 4, NOTE)
 953 #define SET_INSN_DELETED(INSN) set_insn_deleted (INSN);
 954 #define NOTE_BLOCK(INSN)        XCTREE (INSN, 4, NOTE)
 955 #define NOTE_EH_HANDLER(INSN)   XCINT (INSN, 4, NOTE)
 956 #define NOTE_BASIC_BLOCK(INSN)  XCBBDEF (INSN, 4, NOTE)
 957 #define NOTE_VAR_LOCATION(INSN) XCEXP (INSN, 4, NOTE)
 958 #define NOTE_CFI(INSN)          XCCFI (INSN, 4, NOTE)
 959 #define NOTE_LABEL_NUMBER(INSN) XCINT (INSN, 4, NOTE)
 960
 961 /* In a NOTE that is a line number, this is the line number.
 962    Other kinds of NOTEs are identified by negative numbers here.  */
 963 #define NOTE_KIND(INSN) XCINT (INSN, 5, NOTE)
 964
 965 /* Nonzero if INSN is a note marking the beginning of a basic block.  */
 966 #define NOTE_INSN_BASIC_BLOCK_P(INSN)                   \
 967   (GET_CODE (INSN) == NOTE                              \
 968    && NOTE_KIND (INSN) == NOTE_INSN_BASIC_BLOCK)
 969
 970 /* Variable declaration and the location of a variable.  */
 971 #define PAT_VAR_LOCATION_DECL(PAT) (XCTREE ((PAT), 0, VAR_LOCATION))
 972 #define PAT_VAR_LOCATION_LOC(PAT) (XCEXP ((PAT), 1, VAR_LOCATION))
 973
 974 /* Initialization status of the variable in the location.  Status
 975    can be unknown, uninitialized or initialized.  See enumeration
 976    type below.  */
 977 #define PAT_VAR_LOCATION_STATUS(PAT) \
 978   ((enum var_init_status) (XCINT ((PAT), 2, VAR_LOCATION)))
 979
 980 /* Accessors for a NOTE_INSN_VAR_LOCATION.  */
 981 #define NOTE_VAR_LOCATION_DECL(NOTE) \
 982   PAT_VAR_LOCATION_DECL (NOTE_VAR_LOCATION (NOTE))
 983 #define NOTE_VAR_LOCATION_LOC(NOTE) \
 984   PAT_VAR_LOCATION_LOC (NOTE_VAR_LOCATION (NOTE))
 985 #define NOTE_VAR_LOCATION_STATUS(NOTE) \
 986   PAT_VAR_LOCATION_STATUS (NOTE_VAR_LOCATION (NOTE))
 987
 988 /* The VAR_LOCATION rtx in a DEBUG_INSN.  */
 989 #define INSN_VAR_LOCATION(INSN) PATTERN (INSN)
 990
 991 /* Accessors for a tree-expanded var location debug insn.  */
 992 #define INSN_VAR_LOCATION_DECL(INSN) \
 993   PAT_VAR_LOCATION_DECL (INSN_VAR_LOCATION (INSN))
 994 #define INSN_VAR_LOCATION_LOC(INSN) \
 995   PAT_VAR_LOCATION_LOC (INSN_VAR_LOCATION (INSN))
 996 #define INSN_VAR_LOCATION_STATUS(INSN) \
 997   PAT_VAR_LOCATION_STATUS (INSN_VAR_LOCATION (INSN))
 998
 999 /* Expand to the RTL that denotes an unknown variable location in a
1000    DEBUG_INSN.  */
1001 #define gen_rtx_UNKNOWN_VAR_LOC() (gen_rtx_CLOBBER (VOIDmode, const0_rtx))
1002
1003 /* Determine whether X is such an unknown location.  */
1004 #define VAR_LOC_UNKNOWN_P(X) \
1005   (GET_CODE (X) == CLOBBER && XEXP ((X), 0) == const0_rtx)
1006
1007 /* 1 if RTX is emitted after a call, but it should take effect before
1008    the call returns.  */
1009 #define NOTE_DURING_CALL_P(RTX)                         \
1010   (RTL_FLAG_CHECK1("NOTE_VAR_LOCATION_DURING_CALL_P", (RTX), NOTE)->call)
1011
1012 /* DEBUG_EXPR_DECL corresponding to a DEBUG_EXPR RTX.  */
1013 #define DEBUG_EXPR_TREE_DECL(RTX) XCTREE (RTX, 0, DEBUG_EXPR)
1014
1015 /* VAR_DECL/PARM_DECL DEBUG_IMPLICIT_PTR takes address of.  */
1016 #define DEBUG_IMPLICIT_PTR_DECL(RTX) XCTREE (RTX, 0, DEBUG_IMPLICIT_PTR)
1017
1018 /* PARM_DECL DEBUG_PARAMETER_REF references.  */
1019 #define DEBUG_PARAMETER_REF_DECL(RTX) XCTREE (RTX, 0, DEBUG_PARAMETER_REF)
1020
1021 /* Codes that appear in the NOTE_KIND field for kinds of notes
1022    that are not line numbers.  These codes are all negative.
1023
1024    Notice that we do not try to use zero here for any of
1025    the special note codes because sometimes the source line
1026    actually can be zero!  This happens (for example) when we
1027    are generating code for the per-translation-unit constructor
1028    and destructor routines for some C++ translation unit.  */
1029
1030 enum insn_note
1031 {
1032 #define DEF_INSN_NOTE(NAME) NAME,
1033 #include "insn-notes.def"
1034 #undef DEF_INSN_NOTE
1035
1036   NOTE_INSN_MAX
1037 };
1038
1039 /* Names for NOTE insn's other than line numbers.  */
1040
1041 extern const char * const note_insn_name[NOTE_INSN_MAX];
1042 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
1043   (note_insn_name[(NOTE_CODE)])
1044
1045 /* The name of a label, in case it corresponds to an explicit label
1046    in the input source code.  */
1047 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
1048
1049 /* In jump.c, each label contains a count of the number
1050    of LABEL_REFs that point at it, so unused labels can be deleted.  */
1051 #define LABEL_NUSES(RTX) XCINT (RTX, 5, CODE_LABEL)
1052
1053 /* Labels carry a two-bit field composed of the ->jump and ->call
1054    bits.  This field indicates whether the label is an alternate
1055    entry point, and if so, what kind.  */
1056 enum label_kind
1057 {
1058   LABEL_NORMAL = 0,     /* ordinary label */
1059   LABEL_STATIC_ENTRY,   /* alternate entry point, not exported */
1060   LABEL_GLOBAL_ENTRY,   /* alternate entry point, exported */
1061   LABEL_WEAK_ENTRY      /* alternate entry point, exported as weak symbol */
1062 };
1063
1064 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
1065
1066 /* Retrieve the kind of LABEL.  */
1067 #define LABEL_KIND(LABEL) __extension__                                 \
1068 ({ __typeof (LABEL) const _label = (LABEL);                             \
1069    if (GET_CODE (_label) != CODE_LABEL)                                 \
1070      rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__,   \
1071                             __FUNCTION__);                              \
1072    (enum label_kind) ((_label->jump << 1) | _label->call); })
1073
1074 /* Set the kind of LABEL.  */
1075 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1076    __typeof (LABEL) const _label = (LABEL);                             \
1077    const unsigned int _kind = (KIND);                                   \
1078    if (GET_CODE (_label) != CODE_LABEL)                                 \
1079      rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
1080                             __FUNCTION__);                              \
1081    _label->jump = ((_kind >> 1) & 1);                                   \
1082    _label->call = (_kind & 1);                                          \
1083 } while (0)
1084
1085 #else
1086
1087 /* Retrieve the kind of LABEL.  */
1088 #define LABEL_KIND(LABEL) \
1089    ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
1090
1091 /* Set the kind of LABEL.  */
1092 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1093    rtx const _label = (LABEL);                                          \
1094    const unsigned int _kind = (KIND);                                   \
1095    _label->jump = ((_kind >> 1) & 1);                                   \
1096    _label->call = (_kind & 1);                                          \
1097 } while (0)
1098
1099 #endif /* rtl flag checking */
1100
1101 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
1102
1103 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
1104    so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
1105    be decremented and possibly the label can be deleted.  */
1106 #define JUMP_LABEL(INSN)   XCEXP (INSN, 8, JUMP_INSN)
1107
1108 /* Once basic blocks are found, each CODE_LABEL starts a chain that
1109    goes through all the LABEL_REFs that jump to that label.  The chain
1110    eventually winds up at the CODE_LABEL: it is circular.  */
1111 #define LABEL_REFS(LABEL) XCEXP (LABEL, 4, CODE_LABEL)
1112 \f
1113 /* For a REG rtx, REGNO extracts the register number.  REGNO can only
1114    be used on RHS.  Use SET_REGNO to change the value.  */
1115 #define REGNO(RTX) (rhs_regno(RTX))
1116 #define SET_REGNO(RTX,N) (df_ref_change_reg_with_loc (REGNO(RTX), N, RTX), XCUINT (RTX, 0, REG) = N)
1117 #define SET_REGNO_RAW(RTX,N) (XCUINT (RTX, 0, REG) = N)
1118
1119 /* ORIGINAL_REGNO holds the number the register originally had; for a
1120    pseudo register turned into a hard reg this will hold the old pseudo
1121    register number.  */
1122 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
1123
1124 /* Force the REGNO macro to only be used on the lhs.  */
1125 static inline unsigned int
1126 rhs_regno (const_rtx x)
1127 {
1128   return XCUINT (x, 0, REG);
1129 }
1130
1131
1132 /* 1 if RTX is a reg or parallel that is the current function's return
1133    value.  */
1134 #define REG_FUNCTION_VALUE_P(RTX)                                       \
1135   (RTL_FLAG_CHECK2("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->return_val)
1136
1137 /* 1 if RTX is a reg that corresponds to a variable declared by the user.  */
1138 #define REG_USERVAR_P(RTX)                                              \
1139   (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
1140
1141 /* 1 if RTX is a reg that holds a pointer value.  */
1142 #define REG_POINTER(RTX)                                                \
1143   (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
1144
1145 /* 1 if RTX is a mem that holds a pointer value.  */
1146 #define MEM_POINTER(RTX)                                                \
1147   (RTL_FLAG_CHECK1("MEM_POINTER", (RTX), MEM)->frame_related)
1148
1149 /* 1 if the given register REG corresponds to a hard register.  */
1150 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1151
1152 /* 1 if the given register number REG_NO corresponds to a hard register.  */
1153 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1154
1155 /* For a CONST_INT rtx, INTVAL extracts the integer.  */
1156 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
1157 #define UINTVAL(RTX) ((unsigned HOST_WIDE_INT) INTVAL (RTX))
1158
1159 /* For a CONST_DOUBLE:
1160    For a VOIDmode, there are two integers CONST_DOUBLE_LOW is the
1161      low-order word and ..._HIGH the high-order.
1162    For a float, there is a REAL_VALUE_TYPE structure, and
1163      CONST_DOUBLE_REAL_VALUE(r) is a pointer to it.  */
1164 #define CONST_DOUBLE_LOW(r) XCMWINT (r, 0, CONST_DOUBLE, VOIDmode)
1165 #define CONST_DOUBLE_HIGH(r) XCMWINT (r, 1, CONST_DOUBLE, VOIDmode)
1166 #define CONST_DOUBLE_REAL_VALUE(r) \
1167   ((const struct real_value *) XCNMPRV (r, CONST_DOUBLE, VOIDmode))
1168
1169 #define CONST_FIXED_VALUE(r) \
1170   ((const struct fixed_value *) XCNMPFV (r, CONST_FIXED, VOIDmode))
1171 #define CONST_FIXED_VALUE_HIGH(r) \
1172   ((HOST_WIDE_INT) (CONST_FIXED_VALUE(r)->data.high))
1173 #define CONST_FIXED_VALUE_LOW(r) \
1174   ((HOST_WIDE_INT) (CONST_FIXED_VALUE(r)->data.low))
1175
1176 /* For a CONST_VECTOR, return element #n.  */
1177 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1178
1179 /* For a CONST_VECTOR, return the number of elements in a vector.  */
1180 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1181
1182 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1183    SUBREG_BYTE extracts the byte-number.  */
1184
1185 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1186 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1187
1188 /* in rtlanal.c */
1189 /* Return the right cost to give to an operation
1190    to make the cost of the corresponding register-to-register instruction
1191    N times that of a fast register-to-register instruction.  */
1192 #define COSTS_N_INSNS(N) ((N) * 4)
1193
1194 /* Maximum cost of an rtl expression.  This value has the special meaning
1195    not to use an rtx with this cost under any circumstances.  */
1196 #define MAX_COST INT_MAX
1197
1198 /* A structure to hold all available cost information about an rtl
1199    expression.  */
1200 struct full_rtx_costs
1201 {
1202   int speed;
1203   int size;
1204 };
1205
1206 /* Initialize a full_rtx_costs structure C to the maximum cost.  */
1207 static inline void
1208 init_costs_to_max (struct full_rtx_costs *c)
1209 {
1210   c->speed = MAX_COST;
1211   c->size = MAX_COST;
1212 }
1213
1214 /* Initialize a full_rtx_costs structure C to zero cost.  */
1215 static inline void
1216 init_costs_to_zero (struct full_rtx_costs *c)
1217 {
1218   c->speed = 0;
1219   c->size = 0;
1220 }
1221
1222 /* Compare two full_rtx_costs structures A and B, returning true
1223    if A < B when optimizing for speed.  */
1224 static inline bool
1225 costs_lt_p (struct full_rtx_costs *a, struct full_rtx_costs *b,
1226             bool speed)
1227 {
1228   if (speed)
1229     return (a->speed < b->speed
1230             || (a->speed == b->speed && a->size < b->size));
1231   else
1232     return (a->size < b->size
1233             || (a->size == b->size && a->speed < b->speed));
1234 }
1235
1236 /* Increase both members of the full_rtx_costs structure C by the
1237    cost of N insns.  */
1238 static inline void
1239 costs_add_n_insns (struct full_rtx_costs *c, int n)
1240 {
1241   c->speed += COSTS_N_INSNS (n);
1242   c->size += COSTS_N_INSNS (n);
1243 }
1244
1245 /* Information about an address.  This structure is supposed to be able
1246    to represent all supported target addresses.  Please extend it if it
1247    is not yet general enough.  */
1248 struct address_info {
1249   /* The mode of the value being addressed, or VOIDmode if this is
1250      a load-address operation with no known address mode.  */
1251   enum machine_mode mode;
1252
1253   /* The address space.  */
1254   addr_space_t as;
1255
1256   /* A pointer to the top-level address.  */
1257   rtx *outer;
1258
1259   /* A pointer to the inner address, after all address mutations
1260      have been stripped from the top-level address.  It can be one
1261      of the following:
1262
1263      - A {PRE,POST}_{INC,DEC} of *BASE.  SEGMENT, INDEX and DISP are null.
1264
1265      - A {PRE,POST}_MODIFY of *BASE.  In this case either INDEX or DISP
1266        points to the step value, depending on whether the step is variable
1267        or constant respectively.  SEGMENT is null.
1268
1269      - A plain sum of the form SEGMENT + BASE + INDEX + DISP,
1270        with null fields evaluating to 0.  */
1271   rtx *inner;
1272
1273   /* Components that make up *INNER.  Each one may be null or nonnull.
1274      When nonnull, their meanings are as follows:
1275
1276      - *SEGMENT is the "segment" of memory to which the address refers.
1277        This value is entirely target-specific and is only called a "segment"
1278        because that's its most typical use.  It contains exactly one UNSPEC,
1279        pointed to by SEGMENT_TERM.  The contents of *SEGMENT do not need
1280        reloading.
1281
1282      - *BASE is a variable expression representing a base address.
1283        It contains exactly one REG, SUBREG or MEM, pointed to by BASE_TERM.
1284
1285      - *INDEX is a variable expression representing an index value.
1286        It may be a scaled expression, such as a MULT.  It has exactly
1287        one REG, SUBREG or MEM, pointed to by INDEX_TERM.
1288
1289      - *DISP is a constant, possibly mutated.  DISP_TERM points to the
1290        unmutated RTX_CONST_OBJ.  */
1291   rtx *segment;
1292   rtx *base;
1293   rtx *index;
1294   rtx *disp;
1295
1296   rtx *segment_term;
1297   rtx *base_term;
1298   rtx *index_term;
1299   rtx *disp_term;
1300
1301   /* In a {PRE,POST}_MODIFY address, this points to a second copy
1302      of BASE_TERM, otherwise it is null.  */
1303   rtx *base_term2;
1304
1305   /* ADDRESS if this structure describes an address operand, MEM if
1306      it describes a MEM address.  */
1307   enum rtx_code addr_outer_code;
1308
1309   /* If BASE is nonnull, this is the code of the rtx that contains it.  */
1310   enum rtx_code base_outer_code;
1311
1312   /* True if this is an RTX_AUTOINC address.  */
1313   bool autoinc_p;
1314 };
1315
1316 extern void init_rtlanal (void);
1317 extern int rtx_cost (rtx, enum rtx_code, int, bool);
1318 extern int address_cost (rtx, enum machine_mode, addr_space_t, bool);
1319 extern void get_full_rtx_cost (rtx, enum rtx_code, int,
1320                                struct full_rtx_costs *);
1321 extern unsigned int subreg_lsb (const_rtx);
1322 extern unsigned int subreg_lsb_1 (enum machine_mode, enum machine_mode,
1323                                   unsigned int);
1324 extern unsigned int subreg_regno_offset (unsigned int, enum machine_mode,
1325                                          unsigned int, enum machine_mode);
1326 extern bool subreg_offset_representable_p (unsigned int, enum machine_mode,
1327                                            unsigned int, enum machine_mode);
1328 extern unsigned int subreg_regno (const_rtx);
1329 extern int simplify_subreg_regno (unsigned int, enum machine_mode,
1330                                   unsigned int, enum machine_mode);
1331 extern unsigned int subreg_nregs (const_rtx);
1332 extern unsigned int subreg_nregs_with_regno (unsigned int, const_rtx);
1333 extern unsigned HOST_WIDE_INT nonzero_bits (const_rtx, enum machine_mode);
1334 extern unsigned int num_sign_bit_copies (const_rtx, enum machine_mode);
1335 extern bool constant_pool_constant_p (rtx);
1336 extern bool truncated_to_mode (enum machine_mode, const_rtx);
1337 extern int low_bitmask_len (enum machine_mode, unsigned HOST_WIDE_INT);
1338 extern void split_double (rtx, rtx *, rtx *);
1339 extern rtx *strip_address_mutations (rtx *, enum rtx_code * = 0);
1340 extern void decompose_address (struct address_info *, rtx *,
1341                                enum machine_mode, addr_space_t, enum rtx_code);
1342 extern void decompose_lea_address (struct address_info *, rtx *);
1343 extern void decompose_mem_address (struct address_info *, rtx);
1344 extern void update_address (struct address_info *);
1345 extern HOST_WIDE_INT get_index_scale (const struct address_info *);
1346 extern enum rtx_code get_index_code (const struct address_info *);
1347
1348 #ifndef GENERATOR_FILE
1349 /* Return the cost of SET X.  SPEED_P is true if optimizing for speed
1350    rather than size.  */
1351
1352 static inline int
1353 set_rtx_cost (rtx x, bool speed_p)
1354 {
1355   return rtx_cost (x, INSN, 4, speed_p);
1356 }
1357
1358 /* Like set_rtx_cost, but return both the speed and size costs in C.  */
1359
1360 static inline void
1361 get_full_set_rtx_cost (rtx x, struct full_rtx_costs *c)
1362 {
1363   get_full_rtx_cost (x, INSN, 4, c);
1364 }
1365
1366 /* Return the cost of moving X into a register, relative to the cost
1367    of a register move.  SPEED_P is true if optimizing for speed rather
1368    than size.  */
1369
1370 static inline int
1371 set_src_cost (rtx x, bool speed_p)
1372 {
1373   return rtx_cost (x, SET, 1, speed_p);
1374 }
1375
1376 /* Like set_src_cost, but return both the speed and size costs in C.  */
1377
1378 static inline void
1379 get_full_set_src_cost (rtx x, struct full_rtx_costs *c)
1380 {
1381   get_full_rtx_cost (x, SET, 1, c);
1382 }
1383 #endif
1384
1385 /* 1 if RTX is a subreg containing a reg that is already known to be
1386    sign- or zero-extended from the mode of the subreg to the mode of
1387    the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1388    extension.
1389
1390    When used as a LHS, is means that this extension must be done
1391    when assigning to SUBREG_REG.  */
1392
1393 #define SUBREG_PROMOTED_VAR_P(RTX)                                      \
1394   (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1395
1396 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL)                          \
1397 do {                                                                    \
1398   rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
1399   if ((VAL) < 0)                                                        \
1400     _rtx->volatil = 1;                                                  \
1401   else {                                                                \
1402     _rtx->volatil = 0;                                                  \
1403     _rtx->unchanging = (VAL);                                           \
1404   }                                                                     \
1405 } while (0)
1406
1407 /* Valid for subregs which are SUBREG_PROMOTED_VAR_P().  In that case
1408    this gives the necessary extensions:
1409    0  - signed
1410    1  - normal unsigned
1411    -1 - pointer unsigned, which most often can be handled like unsigned
1412         extension, except for generating instructions where we need to
1413         emit special code (ptr_extend insns) on some architectures.  */
1414
1415 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1416   ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1417    ? -1 : (int) (RTX)->unchanging)
1418
1419 /* Access various components of an ASM_OPERANDS rtx.  */
1420
1421 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1422 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1423 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1424 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1425 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1426 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1427 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1428 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1429   XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1430 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1431   XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1432 #define ASM_OPERANDS_INPUT_MODE(RTX, N)  \
1433   GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1434 #define ASM_OPERANDS_LABEL_VEC(RTX) XCVEC (RTX, 5, ASM_OPERANDS)
1435 #define ASM_OPERANDS_LABEL_LENGTH(RTX) XCVECLEN (RTX, 5, ASM_OPERANDS)
1436 #define ASM_OPERANDS_LABEL(RTX, N) XCVECEXP (RTX, 5, N, ASM_OPERANDS)
1437 #define ASM_OPERANDS_SOURCE_LOCATION(RTX) XCUINT (RTX, 6, ASM_OPERANDS)
1438 #define ASM_INPUT_SOURCE_LOCATION(RTX) XCUINT (RTX, 1, ASM_INPUT)
1439
1440 /* 1 if RTX is a mem that is statically allocated in read-only memory.  */
1441 #define MEM_READONLY_P(RTX) \
1442   (RTL_FLAG_CHECK1("MEM_READONLY_P", (RTX), MEM)->unchanging)
1443
1444 /* 1 if RTX is a mem and we should keep the alias set for this mem
1445    unchanged when we access a component.  Set to 1, or example, when we
1446    are already in a non-addressable component of an aggregate.  */
1447 #define MEM_KEEP_ALIAS_SET_P(RTX)                                       \
1448   (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1449
1450 /* 1 if RTX is a mem or asm_operand for a volatile reference.  */
1451 #define MEM_VOLATILE_P(RTX)                                             \
1452   (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS,          \
1453                    ASM_INPUT)->volatil)
1454
1455 /* 1 if RTX is a mem that cannot trap.  */
1456 #define MEM_NOTRAP_P(RTX) \
1457   (RTL_FLAG_CHECK1("MEM_NOTRAP_P", (RTX), MEM)->call)
1458
1459 /* The memory attribute block.  We provide access macros for each value
1460    in the block and provide defaults if none specified.  */
1461 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1462
1463 /* The register attribute block.  We provide access macros for each value
1464    in the block and provide defaults if none specified.  */
1465 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1466
1467 #ifndef GENERATOR_FILE
1468 /* For a MEM rtx, the alias set.  If 0, this MEM is not in any alias
1469    set, and may alias anything.  Otherwise, the MEM can only alias
1470    MEMs in a conflicting alias set.  This value is set in a
1471    language-dependent manner in the front-end, and should not be
1472    altered in the back-end.  These set numbers are tested with
1473    alias_sets_conflict_p.  */
1474 #define MEM_ALIAS_SET(RTX) (get_mem_attrs (RTX)->alias)
1475
1476 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1477    refer to part of a DECL.  It may also be a COMPONENT_REF.  */
1478 #define MEM_EXPR(RTX) (get_mem_attrs (RTX)->expr)
1479
1480 /* For a MEM rtx, true if its MEM_OFFSET is known.  */
1481 #define MEM_OFFSET_KNOWN_P(RTX) (get_mem_attrs (RTX)->offset_known_p)
1482
1483 /* For a MEM rtx, the offset from the start of MEM_EXPR.  */
1484 #define MEM_OFFSET(RTX) (get_mem_attrs (RTX)->offset)
1485
1486 /* For a MEM rtx, the address space.  */
1487 #define MEM_ADDR_SPACE(RTX) (get_mem_attrs (RTX)->addrspace)
1488
1489 /* For a MEM rtx, true if its MEM_SIZE is known.  */
1490 #define MEM_SIZE_KNOWN_P(RTX) (get_mem_attrs (RTX)->size_known_p)
1491
1492 /* For a MEM rtx, the size in bytes of the MEM.  */
1493 #define MEM_SIZE(RTX) (get_mem_attrs (RTX)->size)
1494
1495 /* For a MEM rtx, the alignment in bits.  We can use the alignment of the
1496    mode as a default when STRICT_ALIGNMENT, but not if not.  */
1497 #define MEM_ALIGN(RTX) (get_mem_attrs (RTX)->align)
1498 #else
1499 #define MEM_ADDR_SPACE(RTX) ADDR_SPACE_GENERIC
1500 #endif
1501
1502 /* For a REG rtx, the decl it is known to refer to, if it is known to
1503    refer to part of a DECL.  */
1504 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1505
1506 /* For a REG rtx, the offset from the start of REG_EXPR, if known, as an
1507    HOST_WIDE_INT.  */
1508 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1509
1510 /* Copy the attributes that apply to memory locations from RHS to LHS.  */
1511 #define MEM_COPY_ATTRIBUTES(LHS, RHS)                           \
1512   (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS),                 \
1513    MEM_NOTRAP_P (LHS) = MEM_NOTRAP_P (RHS),                     \
1514    MEM_READONLY_P (LHS) = MEM_READONLY_P (RHS),                 \
1515    MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS),     \
1516    MEM_POINTER (LHS) = MEM_POINTER (RHS),                       \
1517    MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1518
1519 /* 1 if RTX is a label_ref for a nonlocal label.  */
1520 /* Likewise in an expr_list for a REG_LABEL_OPERAND or
1521    REG_LABEL_TARGET note.  */
1522 #define LABEL_REF_NONLOCAL_P(RTX)                                       \
1523   (RTL_FLAG_CHECK1("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF)->volatil)
1524
1525 /* 1 if RTX is a code_label that should always be considered to be needed.  */
1526 #define LABEL_PRESERVE_P(RTX)                                           \
1527   (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1528
1529 /* During sched, 1 if RTX is an insn that must be scheduled together
1530    with the preceding insn.  */
1531 #define SCHED_GROUP_P(RTX)                                              \
1532   (RTL_FLAG_CHECK4("SCHED_GROUP_P", (RTX), DEBUG_INSN, INSN,            \
1533                    JUMP_INSN, CALL_INSN                                 \
1534                    )->in_struct)
1535
1536 /* For a SET rtx, SET_DEST is the place that is set
1537    and SET_SRC is the value it is set to.  */
1538 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1539 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1540 #define SET_IS_RETURN_P(RTX)                                            \
1541   (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1542
1543 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
1544 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1545 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1546
1547 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1548    conditionally executing the code on, COND_EXEC_CODE is the code
1549    to execute if the condition is true.  */
1550 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1551 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1552
1553 /* 1 if RTX is a symbol_ref that addresses this function's rtl
1554    constants pool.  */
1555 #define CONSTANT_POOL_ADDRESS_P(RTX)                                    \
1556   (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1557
1558 /* 1 if RTX is a symbol_ref that addresses a value in the file's
1559    tree constant pool.  This information is private to varasm.c.  */
1560 #define TREE_CONSTANT_POOL_ADDRESS_P(RTX)                               \
1561   (RTL_FLAG_CHECK1("TREE_CONSTANT_POOL_ADDRESS_P",                      \
1562                    (RTX), SYMBOL_REF)->frame_related)
1563
1564 /* Used if RTX is a symbol_ref, for machine-specific purposes.  */
1565 #define SYMBOL_REF_FLAG(RTX)                                            \
1566   (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1567
1568 /* 1 if RTX is a symbol_ref that has been the library function in
1569    emit_library_call.  */
1570 #define SYMBOL_REF_USED(RTX)                                            \
1571   (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1572
1573 /* 1 if RTX is a symbol_ref for a weak symbol.  */
1574 #define SYMBOL_REF_WEAK(RTX)                                            \
1575   (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->return_val)
1576
1577 /* A pointer attached to the SYMBOL_REF; either SYMBOL_REF_DECL or
1578    SYMBOL_REF_CONSTANT.  */
1579 #define SYMBOL_REF_DATA(RTX) X0ANY ((RTX), 2)
1580
1581 /* Set RTX's SYMBOL_REF_DECL to DECL.  RTX must not be a constant
1582    pool symbol.  */
1583 #define SET_SYMBOL_REF_DECL(RTX, DECL) \
1584   (gcc_assert (!CONSTANT_POOL_ADDRESS_P (RTX)), X0TREE ((RTX), 2) = (DECL))
1585
1586 /* The tree (decl or constant) associated with the symbol, or null.  */
1587 #define SYMBOL_REF_DECL(RTX) \
1588   (CONSTANT_POOL_ADDRESS_P (RTX) ? NULL : X0TREE ((RTX), 2))
1589
1590 /* Set RTX's SYMBOL_REF_CONSTANT to C.  RTX must be a constant pool symbol.  */
1591 #define SET_SYMBOL_REF_CONSTANT(RTX, C) \
1592   (gcc_assert (CONSTANT_POOL_ADDRESS_P (RTX)), X0CONSTANT ((RTX), 2) = (C))
1593
1594 /* The rtx constant pool entry for a symbol, or null.  */
1595 #define SYMBOL_REF_CONSTANT(RTX) \
1596   (CONSTANT_POOL_ADDRESS_P (RTX) ? X0CONSTANT ((RTX), 2) : NULL)
1597
1598 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1599    information derivable from the tree decl associated with this symbol.
1600    Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1601    decl.  In some cases this is a bug.  But beyond that, it's nice to cache
1602    this information to avoid recomputing it.  Finally, this allows space for
1603    the target to store more than one bit of information, as with
1604    SYMBOL_REF_FLAG.  */
1605 #define SYMBOL_REF_FLAGS(RTX)   X0INT ((RTX), 1)
1606
1607 /* These flags are common enough to be defined for all targets.  They
1608    are computed by the default version of targetm.encode_section_info.  */
1609
1610 /* Set if this symbol is a function.  */
1611 #define SYMBOL_FLAG_FUNCTION    (1 << 0)
1612 #define SYMBOL_REF_FUNCTION_P(RTX) \
1613   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1614 /* Set if targetm.binds_local_p is true.  */
1615 #define SYMBOL_FLAG_LOCAL       (1 << 1)
1616 #define SYMBOL_REF_LOCAL_P(RTX) \
1617   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1618 /* Set if targetm.in_small_data_p is true.  */
1619 #define SYMBOL_FLAG_SMALL       (1 << 2)
1620 #define SYMBOL_REF_SMALL_P(RTX) \
1621   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1622 /* The three-bit field at [5:3] is true for TLS variables; use
1623    SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model.  */
1624 #define SYMBOL_FLAG_TLS_SHIFT   3
1625 #define SYMBOL_REF_TLS_MODEL(RTX) \
1626   ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 7))
1627 /* Set if this symbol is not defined in this translation unit.  */
1628 #define SYMBOL_FLAG_EXTERNAL    (1 << 6)
1629 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1630   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1631 /* Set if this symbol has a block_symbol structure associated with it.  */
1632 #define SYMBOL_FLAG_HAS_BLOCK_INFO (1 << 7)
1633 #define SYMBOL_REF_HAS_BLOCK_INFO_P(RTX) \
1634   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_HAS_BLOCK_INFO) != 0)
1635 /* Set if this symbol is a section anchor.  SYMBOL_REF_ANCHOR_P implies
1636    SYMBOL_REF_HAS_BLOCK_INFO_P.  */
1637 #define SYMBOL_FLAG_ANCHOR      (1 << 8)
1638 #define SYMBOL_REF_ANCHOR_P(RTX) \
1639   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_ANCHOR) != 0)
1640
1641 /* Subsequent bits are available for the target to use.  */
1642 #define SYMBOL_FLAG_MACH_DEP_SHIFT      9
1643 #define SYMBOL_FLAG_MACH_DEP            (1 << SYMBOL_FLAG_MACH_DEP_SHIFT)
1644
1645 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the object_block
1646    structure to which the symbol belongs, or NULL if it has not been
1647    assigned a block.  */
1648 #define SYMBOL_REF_BLOCK(RTX) (BLOCK_SYMBOL_CHECK (RTX)->block)
1649
1650 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the offset of RTX from
1651    the first object in SYMBOL_REF_BLOCK (RTX).  The value is negative if
1652    RTX has not yet been assigned to a block, or it has not been given an
1653    offset within that block.  */
1654 #define SYMBOL_REF_BLOCK_OFFSET(RTX) (BLOCK_SYMBOL_CHECK (RTX)->offset)
1655
1656 /* True if RTX is flagged to be a scheduling barrier.  */
1657 #define PREFETCH_SCHEDULE_BARRIER_P(RTX)                                        \
1658   (RTL_FLAG_CHECK1("PREFETCH_SCHEDULE_BARRIER_P", (RTX), PREFETCH)->volatil)
1659
1660 /* Indicate whether the machine has any sort of auto increment addressing.
1661    If not, we can avoid checking for REG_INC notes.  */
1662
1663 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
1664      || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT) \
1665      || defined (HAVE_PRE_MODIFY_DISP) || defined (HAVE_PRE_MODIFY_DISP) \
1666      || defined (HAVE_PRE_MODIFY_REG) || defined (HAVE_POST_MODIFY_REG))
1667 #define AUTO_INC_DEC
1668 #endif
1669
1670 /* Define a macro to look for REG_INC notes,
1671    but save time on machines where they never exist.  */
1672
1673 #ifdef AUTO_INC_DEC
1674 #define FIND_REG_INC_NOTE(INSN, REG)                    \
1675   ((REG) != NULL_RTX && REG_P ((REG))                   \
1676    ? find_regno_note ((INSN), REG_INC, REGNO (REG))     \
1677    : find_reg_note ((INSN), REG_INC, (REG)))
1678 #else
1679 #define FIND_REG_INC_NOTE(INSN, REG) 0
1680 #endif
1681
1682 #ifndef HAVE_PRE_INCREMENT
1683 #define HAVE_PRE_INCREMENT 0
1684 #endif
1685
1686 #ifndef HAVE_PRE_DECREMENT
1687 #define HAVE_PRE_DECREMENT 0
1688 #endif
1689
1690 #ifndef HAVE_POST_INCREMENT
1691 #define HAVE_POST_INCREMENT 0
1692 #endif
1693
1694 #ifndef HAVE_POST_DECREMENT
1695 #define HAVE_POST_DECREMENT 0
1696 #endif
1697
1698 #ifndef HAVE_POST_MODIFY_DISP
1699 #define HAVE_POST_MODIFY_DISP 0
1700 #endif
1701
1702 #ifndef HAVE_POST_MODIFY_REG
1703 #define HAVE_POST_MODIFY_REG 0
1704 #endif
1705
1706 #ifndef HAVE_PRE_MODIFY_DISP
1707 #define HAVE_PRE_MODIFY_DISP 0
1708 #endif
1709
1710 #ifndef HAVE_PRE_MODIFY_REG
1711 #define HAVE_PRE_MODIFY_REG 0
1712 #endif
1713
1714
1715 /* Some architectures do not have complete pre/post increment/decrement
1716    instruction sets, or only move some modes efficiently.  These macros
1717    allow us to tune autoincrement generation.  */
1718
1719 #ifndef USE_LOAD_POST_INCREMENT
1720 #define USE_LOAD_POST_INCREMENT(MODE)   HAVE_POST_INCREMENT
1721 #endif
1722
1723 #ifndef USE_LOAD_POST_DECREMENT
1724 #define USE_LOAD_POST_DECREMENT(MODE)   HAVE_POST_DECREMENT
1725 #endif
1726
1727 #ifndef USE_LOAD_PRE_INCREMENT
1728 #define USE_LOAD_PRE_INCREMENT(MODE)    HAVE_PRE_INCREMENT
1729 #endif
1730
1731 #ifndef USE_LOAD_PRE_DECREMENT
1732 #define USE_LOAD_PRE_DECREMENT(MODE)    HAVE_PRE_DECREMENT
1733 #endif
1734
1735 #ifndef USE_STORE_POST_INCREMENT
1736 #define USE_STORE_POST_INCREMENT(MODE)  HAVE_POST_INCREMENT
1737 #endif
1738
1739 #ifndef USE_STORE_POST_DECREMENT
1740 #define USE_STORE_POST_DECREMENT(MODE)  HAVE_POST_DECREMENT
1741 #endif
1742
1743 #ifndef USE_STORE_PRE_INCREMENT
1744 #define USE_STORE_PRE_INCREMENT(MODE)   HAVE_PRE_INCREMENT
1745 #endif
1746
1747 #ifndef USE_STORE_PRE_DECREMENT
1748 #define USE_STORE_PRE_DECREMENT(MODE)   HAVE_PRE_DECREMENT
1749 #endif
1750 \f
1751 /* Nonzero when we are generating CONCATs.  */
1752 extern int generating_concat_p;
1753
1754 /* Nonzero when we are expanding trees to RTL.  */
1755 extern int currently_expanding_to_rtl;
1756
1757 /* Generally useful functions.  */
1758
1759 /* In explow.c */
1760 extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
1761 extern rtx plus_constant (enum machine_mode, rtx, HOST_WIDE_INT);
1762
1763 /* In rtl.c */
1764 extern rtx rtx_alloc_stat (RTX_CODE MEM_STAT_DECL);
1765 #define rtx_alloc(c) rtx_alloc_stat (c MEM_STAT_INFO)
1766
1767 extern rtvec rtvec_alloc (int);
1768 extern rtvec shallow_copy_rtvec (rtvec);
1769 extern bool shared_const_p (const_rtx);
1770 extern rtx copy_rtx (rtx);
1771 extern void dump_rtx_statistics (void);
1772
1773 /* In emit-rtl.c */
1774 extern rtx copy_rtx_if_shared (rtx);
1775
1776 /* In rtl.c */
1777 extern unsigned int rtx_size (const_rtx);
1778 extern rtx shallow_copy_rtx_stat (const_rtx MEM_STAT_DECL);
1779 #define shallow_copy_rtx(a) shallow_copy_rtx_stat (a MEM_STAT_INFO)
1780 extern int rtx_equal_p (const_rtx, const_rtx);
1781 extern hashval_t iterative_hash_rtx (const_rtx, hashval_t);
1782
1783 /* In emit-rtl.c */
1784 extern rtvec gen_rtvec_v (int, rtx *);
1785 extern rtx gen_reg_rtx (enum machine_mode);
1786 extern rtx gen_rtx_REG_offset (rtx, enum machine_mode, unsigned int, int);
1787 extern rtx gen_reg_rtx_offset (rtx, enum machine_mode, int);
1788 extern rtx gen_reg_rtx_and_attrs (rtx);
1789 extern rtx gen_label_rtx (void);
1790 extern rtx gen_lowpart_common (enum machine_mode, rtx);
1791
1792 /* In cse.c */
1793 extern rtx gen_lowpart_if_possible (enum machine_mode, rtx);
1794
1795 /* In emit-rtl.c */
1796 extern rtx gen_highpart (enum machine_mode, rtx);
1797 extern rtx gen_highpart_mode (enum machine_mode, enum machine_mode, rtx);
1798 extern rtx operand_subword (rtx, unsigned int, int, enum machine_mode);
1799
1800 /* In emit-rtl.c */
1801 extern rtx operand_subword_force (rtx, unsigned int, enum machine_mode);
1802 extern bool paradoxical_subreg_p (const_rtx);
1803 extern int subreg_lowpart_p (const_rtx);
1804 extern unsigned int subreg_lowpart_offset (enum machine_mode,
1805                                            enum machine_mode);
1806 extern unsigned int subreg_highpart_offset (enum machine_mode,
1807                                             enum machine_mode);
1808 extern int byte_lowpart_offset (enum machine_mode, enum machine_mode);
1809 extern rtx make_safe_from (rtx, rtx);
1810 extern rtx convert_memory_address_addr_space (enum machine_mode, rtx,
1811                                               addr_space_t);
1812 #define convert_memory_address(to_mode,x) \
1813         convert_memory_address_addr_space ((to_mode), (x), ADDR_SPACE_GENERIC)
1814 extern const char *get_insn_name (int);
1815 extern rtx get_last_insn_anywhere (void);
1816 extern rtx get_first_nonnote_insn (void);
1817 extern rtx get_last_nonnote_insn (void);
1818 extern void start_sequence (void);
1819 extern void push_to_sequence (rtx);
1820 extern void push_to_sequence2 (rtx, rtx);
1821 extern void end_sequence (void);
1822 extern double_int rtx_to_double_int (const_rtx);
1823 extern rtx immed_double_int_const (double_int, enum machine_mode);
1824 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
1825                                enum machine_mode);
1826
1827 /* In loop-iv.c  */
1828
1829 extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
1830
1831 /* In varasm.c  */
1832 extern rtx force_const_mem (enum machine_mode, rtx);
1833
1834 /* In varasm.c  */
1835
1836 struct function;
1837 extern rtx get_pool_constant (rtx);
1838 extern rtx get_pool_constant_mark (rtx, bool *);
1839 extern enum machine_mode get_pool_mode (const_rtx);
1840 extern rtx simplify_subtraction (rtx);
1841 extern void decide_function_section (tree);
1842
1843 /* In function.c  */
1844 extern rtx assign_stack_local (enum machine_mode, HOST_WIDE_INT, int);
1845 #define ASLK_REDUCE_ALIGN 1
1846 #define ASLK_RECORD_PAD 2
1847 extern rtx assign_stack_local_1 (enum machine_mode, HOST_WIDE_INT, int, int);
1848 extern rtx assign_stack_temp (enum machine_mode, HOST_WIDE_INT);
1849 extern rtx assign_stack_temp_for_type (enum machine_mode, HOST_WIDE_INT, tree);
1850 extern rtx assign_temp (tree, int, int);
1851
1852 /* In emit-rtl.c */
1853 extern rtx emit_insn_before (rtx, rtx);
1854 extern rtx emit_insn_before_noloc (rtx, rtx, basic_block);
1855 extern rtx emit_insn_before_setloc (rtx, rtx, int);
1856 extern rtx emit_jump_insn_before (rtx, rtx);
1857 extern rtx emit_jump_insn_before_noloc (rtx, rtx);
1858 extern rtx emit_jump_insn_before_setloc (rtx, rtx, int);
1859 extern rtx emit_call_insn_before (rtx, rtx);
1860 extern rtx emit_call_insn_before_noloc (rtx, rtx);
1861 extern rtx emit_call_insn_before_setloc (rtx, rtx, int);
1862 extern rtx emit_debug_insn_before (rtx, rtx);
1863 extern rtx emit_debug_insn_before_noloc (rtx, rtx);
1864 extern rtx emit_debug_insn_before_setloc (rtx, rtx, int);
1865 extern rtx emit_barrier_before (rtx);
1866 extern rtx emit_label_before (rtx, rtx);
1867 extern rtx emit_note_before (enum insn_note, rtx);
1868 extern rtx emit_insn_after (rtx, rtx);
1869 extern rtx emit_insn_after_noloc (rtx, rtx, basic_block);
1870 extern rtx emit_insn_after_setloc (rtx, rtx, int);
1871 extern rtx emit_jump_insn_after (rtx, rtx);
1872 extern rtx emit_jump_insn_after_noloc (rtx, rtx);
1873 extern rtx emit_jump_insn_after_setloc (rtx, rtx, int);
1874 extern rtx emit_call_insn_after (rtx, rtx);
1875 extern rtx emit_call_insn_after_noloc (rtx, rtx);
1876 extern rtx emit_call_insn_after_setloc (rtx, rtx, int);
1877 extern rtx emit_debug_insn_after (rtx, rtx);
1878 extern rtx emit_debug_insn_after_noloc (rtx, rtx);
1879 extern rtx emit_debug_insn_after_setloc (rtx, rtx, int);
1880 extern rtx emit_barrier_after (rtx);
1881 extern rtx emit_label_after (rtx, rtx);
1882 extern rtx emit_note_after (enum insn_note, rtx);
1883 extern rtx emit_insn (rtx);
1884 extern rtx emit_debug_insn (rtx);
1885 extern rtx emit_jump_insn (rtx);
1886 extern rtx emit_call_insn (rtx);
1887 extern rtx emit_label (rtx);
1888 extern rtx emit_barrier (void);
1889 extern rtx emit_note (enum insn_note);
1890 extern rtx emit_note_copy (rtx);
1891 extern rtx gen_clobber (rtx);
1892 extern rtx emit_clobber (rtx);
1893 extern rtx gen_use (rtx);
1894 extern rtx emit_use (rtx);
1895 extern rtx make_insn_raw (rtx);
1896 extern void add_function_usage_to (rtx, rtx);
1897 extern rtx last_call_insn (void);
1898 extern rtx previous_insn (rtx);
1899 extern rtx next_insn (rtx);
1900 extern rtx prev_nonnote_insn (rtx);
1901 extern rtx prev_nonnote_insn_bb (rtx);
1902 extern rtx next_nonnote_insn (rtx);
1903 extern rtx next_nonnote_insn_bb (rtx);
1904 extern rtx prev_nondebug_insn (rtx);
1905 extern rtx next_nondebug_insn (rtx);
1906 extern rtx prev_nonnote_nondebug_insn (rtx);
1907 extern rtx next_nonnote_nondebug_insn (rtx);
1908 extern rtx prev_real_insn (rtx);
1909 extern rtx next_real_insn (rtx);
1910 extern rtx prev_active_insn (rtx);
1911 extern rtx next_active_insn (rtx);
1912 extern int active_insn_p (const_rtx);
1913 extern rtx next_label (rtx);
1914 extern rtx skip_consecutive_labels (rtx);
1915 extern rtx next_cc0_user (rtx);
1916 extern rtx prev_cc0_setter (rtx);
1917
1918 /* In emit-rtl.c  */
1919 extern int insn_line (const_rtx);
1920 extern const char * insn_file (const_rtx);
1921 extern tree insn_scope (const_rtx);
1922 extern location_t prologue_location, epilogue_location;
1923
1924 /* In jump.c */
1925 extern enum rtx_code reverse_condition (enum rtx_code);
1926 extern enum rtx_code reverse_condition_maybe_unordered (enum rtx_code);
1927 extern enum rtx_code swap_condition (enum rtx_code);
1928 extern enum rtx_code unsigned_condition (enum rtx_code);
1929 extern enum rtx_code signed_condition (enum rtx_code);
1930 extern void mark_jump_label (rtx, rtx, int);
1931 extern unsigned int cleanup_barriers (void);
1932
1933 /* In jump.c */
1934 extern rtx delete_related_insns (rtx);
1935
1936 /* In recog.c  */
1937 extern rtx *find_constant_term_loc (rtx *);
1938
1939 /* In emit-rtl.c  */
1940 extern rtx try_split (rtx, rtx, int);
1941 extern int split_branch_probability;
1942
1943 /* In unknown file  */
1944 extern rtx split_insns (rtx, rtx);
1945
1946 /* In simplify-rtx.c  */
1947 extern rtx simplify_const_unary_operation (enum rtx_code, enum machine_mode,
1948                                            rtx, enum machine_mode);
1949 extern rtx simplify_unary_operation (enum rtx_code, enum machine_mode, rtx,
1950                                      enum machine_mode);
1951 extern rtx simplify_const_binary_operation (enum rtx_code, enum machine_mode,
1952                                             rtx, rtx);
1953 extern rtx simplify_binary_operation (enum rtx_code, enum machine_mode, rtx,
1954                                       rtx);
1955 extern rtx simplify_ternary_operation (enum rtx_code, enum machine_mode,
1956                                        enum machine_mode, rtx, rtx, rtx);
1957 extern rtx simplify_const_relational_operation (enum rtx_code,
1958                                                 enum machine_mode, rtx, rtx);
1959 extern rtx simplify_relational_operation (enum rtx_code, enum machine_mode,
1960                                           enum machine_mode, rtx, rtx);
1961 extern rtx simplify_gen_binary (enum rtx_code, enum machine_mode, rtx, rtx);
1962 extern rtx simplify_gen_unary (enum rtx_code, enum machine_mode, rtx,
1963                                enum machine_mode);
1964 extern rtx simplify_gen_ternary (enum rtx_code, enum machine_mode,
1965                                  enum machine_mode, rtx, rtx, rtx);
1966 extern rtx simplify_gen_relational (enum rtx_code, enum machine_mode,
1967                                     enum machine_mode, rtx, rtx);
1968 extern rtx simplify_subreg (enum machine_mode, rtx, enum machine_mode,
1969                             unsigned int);
1970 extern rtx simplify_gen_subreg (enum machine_mode, rtx, enum machine_mode,
1971                                 unsigned int);
1972 extern rtx simplify_replace_fn_rtx (rtx, const_rtx,
1973                                     rtx (*fn) (rtx, const_rtx, void *), void *);
1974 extern rtx simplify_replace_rtx (rtx, const_rtx, rtx);
1975 extern rtx simplify_rtx (const_rtx);
1976 extern rtx avoid_constant_pool_reference (rtx);
1977 extern rtx delegitimize_mem_from_attrs (rtx);
1978 extern bool mode_signbit_p (enum machine_mode, const_rtx);
1979 extern bool val_signbit_p (enum machine_mode, unsigned HOST_WIDE_INT);
1980 extern bool val_signbit_known_set_p (enum machine_mode,
1981                                      unsigned HOST_WIDE_INT);
1982 extern bool val_signbit_known_clear_p (enum machine_mode,
1983                                        unsigned HOST_WIDE_INT);
1984
1985 /* In reginfo.c  */
1986 extern enum machine_mode choose_hard_reg_mode (unsigned int, unsigned int,
1987                                                bool);
1988
1989 /* In emit-rtl.c  */
1990 extern rtx set_unique_reg_note (rtx, enum reg_note, rtx);
1991 extern rtx set_dst_reg_note (rtx, enum reg_note, rtx, rtx);
1992 extern void set_insn_deleted (rtx);
1993
1994 /* Functions in rtlanal.c */
1995
1996 /* Single set is implemented as macro for performance reasons.  */
1997 #define single_set(I) (INSN_P (I) \
1998                        ? (GET_CODE (PATTERN (I)) == SET \
1999                           ? PATTERN (I) : single_set_1 (I)) \
2000                        : NULL_RTX)
2001 #define single_set_1(I) single_set_2 (I, PATTERN (I))
2002
2003 /* Structure used for passing data to REPLACE_LABEL.  */
2004 typedef struct replace_label_data
2005 {
2006   rtx r1;
2007   rtx r2;
2008   bool update_label_nuses;
2009 } replace_label_data;
2010
2011 extern enum machine_mode get_address_mode (rtx mem);
2012 extern int rtx_addr_can_trap_p (const_rtx);
2013 extern bool nonzero_address_p (const_rtx);
2014 extern int rtx_unstable_p (const_rtx);
2015 extern bool rtx_varies_p (const_rtx, bool);
2016 extern bool rtx_addr_varies_p (const_rtx, bool);
2017 extern rtx get_call_rtx_from (rtx);
2018 extern HOST_WIDE_INT get_integer_term (const_rtx);
2019 extern rtx get_related_value (const_rtx);
2020 extern bool offset_within_block_p (const_rtx, HOST_WIDE_INT);
2021 extern void split_const (rtx, rtx *, rtx *);
2022 extern bool unsigned_reg_p (rtx);
2023 extern int reg_mentioned_p (const_rtx, const_rtx);
2024 extern int count_occurrences (const_rtx, const_rtx, int);
2025 extern int reg_referenced_p (const_rtx, const_rtx);
2026 extern int reg_used_between_p (const_rtx, const_rtx, const_rtx);
2027 extern int reg_set_between_p (const_rtx, const_rtx, const_rtx);
2028 extern int commutative_operand_precedence (rtx);
2029 extern bool swap_commutative_operands_p (rtx, rtx);
2030 extern int modified_between_p (const_rtx, const_rtx, const_rtx);
2031 extern int no_labels_between_p (const_rtx, const_rtx);
2032 extern int modified_in_p (const_rtx, const_rtx);
2033 extern int reg_set_p (const_rtx, const_rtx);
2034 extern rtx single_set_2 (const_rtx, const_rtx);
2035 extern int multiple_sets (const_rtx);
2036 extern int set_noop_p (const_rtx);
2037 extern int noop_move_p (const_rtx);
2038 extern rtx find_last_value (rtx, rtx *, rtx, int);
2039 extern int refers_to_regno_p (unsigned int, unsigned int, const_rtx, rtx *);
2040 extern int reg_overlap_mentioned_p (const_rtx, const_rtx);
2041 extern const_rtx set_of (const_rtx, const_rtx);
2042 extern void record_hard_reg_sets (rtx, const_rtx, void *);
2043 extern void record_hard_reg_uses (rtx *, void *);
2044 #ifdef HARD_CONST
2045 extern void find_all_hard_reg_sets (const_rtx, HARD_REG_SET *);
2046 #endif
2047 extern void note_stores (const_rtx, void (*) (rtx, const_rtx, void *), void *);
2048 extern void note_uses (rtx *, void (*) (rtx *, void *), void *);
2049 extern int dead_or_set_p (const_rtx, const_rtx);
2050 extern int dead_or_set_regno_p (const_rtx, unsigned int);
2051 extern rtx find_reg_note (const_rtx, enum reg_note, const_rtx);
2052 extern rtx find_regno_note (const_rtx, enum reg_note, unsigned int);
2053 extern rtx find_reg_equal_equiv_note (const_rtx);
2054 extern rtx find_constant_src (const_rtx);
2055 extern int find_reg_fusage (const_rtx, enum rtx_code, const_rtx);
2056 extern int find_regno_fusage (const_rtx, enum rtx_code, unsigned int);
2057 extern rtx alloc_reg_note (enum reg_note, rtx, rtx);
2058 extern void add_reg_note (rtx, enum reg_note, rtx);
2059 extern void remove_note (rtx, const_rtx);
2060 extern void remove_reg_equal_equiv_notes (rtx);
2061 extern void remove_reg_equal_equiv_notes_for_regno (unsigned int);
2062 extern int side_effects_p (const_rtx);
2063 extern int volatile_refs_p (const_rtx);
2064 extern int volatile_insn_p (const_rtx);
2065 extern int may_trap_p_1 (const_rtx, unsigned);
2066 extern int may_trap_p (const_rtx);
2067 extern int may_trap_or_fault_p (const_rtx);
2068 extern bool can_throw_internal (const_rtx);
2069 extern bool can_throw_external (const_rtx);
2070 extern bool insn_could_throw_p (const_rtx);
2071 extern bool insn_nothrow_p (const_rtx);
2072 extern bool can_nonlocal_goto (const_rtx);
2073 extern void copy_reg_eh_region_note_forward (rtx, rtx, rtx);
2074 extern void copy_reg_eh_region_note_backward(rtx, rtx, rtx);
2075 extern int inequality_comparisons_p (const_rtx);
2076 extern rtx replace_rtx (rtx, rtx, rtx);
2077 extern int replace_label (rtx *, void *);
2078 extern int rtx_referenced_p (rtx, rtx);
2079 extern bool tablejump_p (const_rtx, rtx *, rtx *);
2080 extern int computed_jump_p (const_rtx);
2081
2082 typedef int (*rtx_function) (rtx *, void *);
2083 extern int for_each_rtx (rtx *, rtx_function, void *);
2084
2085 /* Callback for for_each_inc_dec, to process the autoinc operation OP
2086    within MEM that sets DEST to SRC + SRCOFF, or SRC if SRCOFF is
2087    NULL.  The callback is passed the same opaque ARG passed to
2088    for_each_inc_dec.  Return zero to continue looking for other
2089    autoinc operations, -1 to skip OP's operands, and any other value
2090    to interrupt the traversal and return that value to the caller of
2091    for_each_inc_dec.  */
2092 typedef int (*for_each_inc_dec_fn) (rtx mem, rtx op, rtx dest, rtx src,
2093                                     rtx srcoff, void *arg);
2094 extern int for_each_inc_dec (rtx *, for_each_inc_dec_fn, void *arg);
2095
2096 typedef int (*rtx_equal_p_callback_function) (const_rtx *, const_rtx *,
2097                                               rtx *, rtx *);
2098 extern int rtx_equal_p_cb (const_rtx, const_rtx,
2099                            rtx_equal_p_callback_function);
2100
2101 typedef int (*hash_rtx_callback_function) (const_rtx, enum machine_mode, rtx *,
2102                                            enum machine_mode *);
2103 extern unsigned hash_rtx_cb (const_rtx, enum machine_mode, int *, int *,
2104                              bool, hash_rtx_callback_function);
2105
2106 extern rtx regno_use_in (unsigned int, rtx);
2107 extern int auto_inc_p (const_rtx);
2108 extern int in_expr_list_p (const_rtx, const_rtx);
2109 extern void remove_node_from_expr_list (const_rtx, rtx *);
2110 extern int loc_mentioned_in_p (rtx *, const_rtx);
2111 extern rtx find_first_parameter_load (rtx, rtx);
2112 extern bool keep_with_call_p (const_rtx);
2113 extern bool label_is_jump_target_p (const_rtx, const_rtx);
2114 extern int insn_rtx_cost (rtx, bool);
2115
2116 /* Given an insn and condition, return a canonical description of
2117    the test being made.  */
2118 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
2119
2120 /* Given a JUMP_INSN, return a canonical description of the test
2121    being made.  */
2122 extern rtx get_condition (rtx, rtx *, int, int);
2123
2124 /* Information about a subreg of a hard register.  */
2125 struct subreg_info
2126 {
2127   /* Offset of first hard register involved in the subreg.  */
2128   int offset;
2129   /* Number of hard registers involved in the subreg.  */
2130   int nregs;
2131   /* Whether this subreg can be represented as a hard reg with the new
2132      mode.  */
2133   bool representable_p;
2134 };
2135
2136 extern void subreg_get_info (unsigned int, enum machine_mode,
2137                              unsigned int, enum machine_mode,
2138                              struct subreg_info *);
2139
2140 /* lists.c */
2141
2142 extern void free_EXPR_LIST_list (rtx *);
2143 extern void free_INSN_LIST_list (rtx *);
2144 extern void free_EXPR_LIST_node (rtx);
2145 extern void free_INSN_LIST_node (rtx);
2146 extern rtx alloc_INSN_LIST (rtx, rtx);
2147 extern rtx copy_INSN_LIST (rtx);
2148 extern rtx concat_INSN_LIST (rtx, rtx);
2149 extern rtx alloc_EXPR_LIST (int, rtx, rtx);
2150 extern void remove_free_INSN_LIST_elem (rtx, rtx *);
2151 extern rtx remove_list_elem (rtx, rtx *);
2152 extern rtx remove_free_INSN_LIST_node (rtx *);
2153 extern rtx remove_free_EXPR_LIST_node (rtx *);
2154
2155
2156 /* reginfo.c */
2157
2158 /* Resize reg info.  */
2159 extern bool resize_reg_info (void);
2160 /* Free up register info memory.  */
2161 extern void free_reg_info (void);
2162 extern void init_subregs_of_mode (void);
2163 extern void finish_subregs_of_mode (void);
2164
2165 /* recog.c */
2166 extern rtx extract_asm_operands (rtx);
2167 extern int asm_noperands (const_rtx);
2168 extern const char *decode_asm_operands (rtx, rtx *, rtx **, const char **,
2169                                         enum machine_mode *, location_t *);
2170
2171 extern enum reg_class reg_preferred_class (int);
2172 extern enum reg_class reg_alternate_class (int);
2173 extern enum reg_class reg_allocno_class (int);
2174 extern void setup_reg_classes (int, enum reg_class, enum reg_class,
2175                                enum reg_class);
2176
2177 extern void split_all_insns (void);
2178 extern unsigned int split_all_insns_noflow (void);
2179
2180 #define MAX_SAVED_CONST_INT 64
2181 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
2182
2183 #define const0_rtx      (const_int_rtx[MAX_SAVED_CONST_INT])
2184 #define const1_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+1])
2185 #define const2_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+2])
2186 #define constm1_rtx     (const_int_rtx[MAX_SAVED_CONST_INT-1])
2187 extern GTY(()) rtx const_true_rtx;
2188
2189 extern GTY(()) rtx const_tiny_rtx[4][(int) MAX_MACHINE_MODE];
2190
2191 /* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
2192    same as VOIDmode.  */
2193
2194 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
2195
2196 /* Likewise, for the constants 1 and 2 and -1.  */
2197
2198 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
2199 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
2200 #define CONSTM1_RTX(MODE) (const_tiny_rtx[3][(int) (MODE)])
2201
2202 extern GTY(()) rtx pc_rtx;
2203 extern GTY(()) rtx cc0_rtx;
2204 extern GTY(()) rtx ret_rtx;
2205 extern GTY(()) rtx simple_return_rtx;
2206
2207 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
2208    is used to represent the frame pointer.  This is because the
2209    hard frame pointer and the automatic variables are separated by an amount
2210    that cannot be determined until after register allocation.  We can assume
2211    that in this case ELIMINABLE_REGS will be defined, one action of which
2212    will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM.  */
2213 #ifndef HARD_FRAME_POINTER_REGNUM
2214 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
2215 #endif
2216
2217 #ifndef HARD_FRAME_POINTER_IS_FRAME_POINTER
2218 #define HARD_FRAME_POINTER_IS_FRAME_POINTER \
2219   (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM)
2220 #endif
2221
2222 #ifndef HARD_FRAME_POINTER_IS_ARG_POINTER
2223 #define HARD_FRAME_POINTER_IS_ARG_POINTER \
2224   (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
2225 #endif
2226
2227 /* Index labels for global_rtl.  */
2228 enum global_rtl_index
2229 {
2230   GR_STACK_POINTER,
2231   GR_FRAME_POINTER,
2232 /* For register elimination to work properly these hard_frame_pointer_rtx,
2233    frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
2234    the same register.  */
2235 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
2236   GR_ARG_POINTER = GR_FRAME_POINTER,
2237 #endif
2238 #if HARD_FRAME_POINTER_IS_FRAME_POINTER
2239   GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
2240 #else
2241   GR_HARD_FRAME_POINTER,
2242 #endif
2243 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
2244 #if HARD_FRAME_POINTER_IS_ARG_POINTER
2245   GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
2246 #else
2247   GR_ARG_POINTER,
2248 #endif
2249 #endif
2250   GR_VIRTUAL_INCOMING_ARGS,
2251   GR_VIRTUAL_STACK_ARGS,
2252   GR_VIRTUAL_STACK_DYNAMIC,
2253   GR_VIRTUAL_OUTGOING_ARGS,
2254   GR_VIRTUAL_CFA,
2255   GR_VIRTUAL_PREFERRED_STACK_BOUNDARY,
2256
2257   GR_MAX
2258 };
2259
2260 /* Target-dependent globals.  */
2261 struct GTY(()) target_rtl {
2262   /* All references to the hard registers in global_rtl_index go through
2263      these unique rtl objects.  On machines where the frame-pointer and
2264      arg-pointer are the same register, they use the same unique object.
2265
2266      After register allocation, other rtl objects which used to be pseudo-regs
2267      may be clobbered to refer to the frame-pointer register.
2268      But references that were originally to the frame-pointer can be
2269      distinguished from the others because they contain frame_pointer_rtx.
2270
2271      When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
2272      tricky: until register elimination has taken place hard_frame_pointer_rtx
2273      should be used if it is being set, and frame_pointer_rtx otherwise.  After
2274      register elimination hard_frame_pointer_rtx should always be used.
2275      On machines where the two registers are same (most) then these are the
2276      same.  */
2277   rtx x_global_rtl[GR_MAX];
2278
2279   /* A unique representation of (REG:Pmode PIC_OFFSET_TABLE_REGNUM).  */
2280   rtx x_pic_offset_table_rtx;
2281
2282   /* A unique representation of (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM).
2283      This is used to implement __builtin_return_address for some machines;
2284      see for instance the MIPS port.  */
2285   rtx x_return_address_pointer_rtx;
2286
2287   /* Commonly used RTL for hard registers.  These objects are not
2288      necessarily unique, so we allocate them separately from global_rtl.
2289      They are initialized once per compilation unit, then copied into
2290      regno_reg_rtx at the beginning of each function.  */
2291   rtx x_initial_regno_reg_rtx[FIRST_PSEUDO_REGISTER];
2292
2293   /* A sample (mem:M stack_pointer_rtx) rtx for each mode M.  */
2294   rtx x_top_of_stack[MAX_MACHINE_MODE];
2295
2296   /* Static hunks of RTL used by the aliasing code; these are treated
2297      as persistent to avoid unnecessary RTL allocations.  */
2298   rtx x_static_reg_base_value[FIRST_PSEUDO_REGISTER];
2299
2300   /* The default memory attributes for each mode.  */
2301   struct mem_attrs *x_mode_mem_attrs[(int) MAX_MACHINE_MODE];
2302 };
2303
2304 extern GTY(()) struct target_rtl default_target_rtl;
2305 #if SWITCHABLE_TARGET
2306 extern struct target_rtl *this_target_rtl;
2307 #else
2308 #define this_target_rtl (&default_target_rtl)
2309 #endif
2310
2311 #define global_rtl                              \
2312   (this_target_rtl->x_global_rtl)
2313 #define pic_offset_table_rtx \
2314   (this_target_rtl->x_pic_offset_table_rtx)
2315 #define return_address_pointer_rtx \
2316   (this_target_rtl->x_return_address_pointer_rtx)
2317 #define top_of_stack \
2318   (this_target_rtl->x_top_of_stack)
2319 #define mode_mem_attrs \
2320   (this_target_rtl->x_mode_mem_attrs)
2321
2322 /* All references to certain hard regs, except those created
2323    by allocating pseudo regs into them (when that's possible),
2324    go through these unique rtx objects.  */
2325 #define stack_pointer_rtx       (global_rtl[GR_STACK_POINTER])
2326 #define frame_pointer_rtx       (global_rtl[GR_FRAME_POINTER])
2327 #define hard_frame_pointer_rtx  (global_rtl[GR_HARD_FRAME_POINTER])
2328 #define arg_pointer_rtx         (global_rtl[GR_ARG_POINTER])
2329
2330 #ifndef GENERATOR_FILE
2331 /* Return the attributes of a MEM rtx.  */
2332 static inline struct mem_attrs *
2333 get_mem_attrs (const_rtx x)
2334 {
2335   struct mem_attrs *attrs;
2336
2337   attrs = MEM_ATTRS (x);
2338   if (!attrs)
2339     attrs = mode_mem_attrs[(int) GET_MODE (x)];
2340   return attrs;
2341 }
2342 #endif
2343
2344 /* Include the RTL generation functions.  */
2345
2346 #ifndef GENERATOR_FILE
2347 #include "genrtl.h"
2348 #undef gen_rtx_ASM_INPUT
2349 #define gen_rtx_ASM_INPUT(MODE, ARG0)                           \
2350   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), 0)
2351 #define gen_rtx_ASM_INPUT_loc(MODE, ARG0, LOC)                  \
2352   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), (LOC))
2353 #endif
2354
2355 /* There are some RTL codes that require special attention; the
2356    generation functions included above do the raw handling.  If you
2357    add to this list, modify special_rtx in gengenrtl.c as well.  */
2358
2359 extern rtx gen_rtx_CONST_INT (enum machine_mode, HOST_WIDE_INT);
2360 extern rtx gen_rtx_CONST_VECTOR (enum machine_mode, rtvec);
2361 extern rtx gen_raw_REG (enum machine_mode, int);
2362 extern rtx gen_rtx_REG (enum machine_mode, unsigned);
2363 extern rtx gen_rtx_SUBREG (enum machine_mode, rtx, int);
2364 extern rtx gen_rtx_MEM (enum machine_mode, rtx);
2365
2366 #define GEN_INT(N)  gen_rtx_CONST_INT (VOIDmode, (N))
2367
2368 /* Virtual registers are used during RTL generation to refer to locations into
2369    the stack frame when the actual location isn't known until RTL generation
2370    is complete.  The routine instantiate_virtual_regs replaces these with
2371    the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
2372    a constant.  */
2373
2374 #define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
2375
2376 /* This points to the first word of the incoming arguments passed on the stack,
2377    either by the caller or by the callee when pretending it was passed by the
2378    caller.  */
2379
2380 #define virtual_incoming_args_rtx       (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
2381
2382 #define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
2383
2384 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
2385    variable on the stack.  Otherwise, it points to the first variable on
2386    the stack.  */
2387
2388 #define virtual_stack_vars_rtx          (global_rtl[GR_VIRTUAL_STACK_ARGS])
2389
2390 #define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
2391
2392 /* This points to the location of dynamically-allocated memory on the stack
2393    immediately after the stack pointer has been adjusted by the amount
2394    desired.  */
2395
2396 #define virtual_stack_dynamic_rtx       (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
2397
2398 #define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
2399
2400 /* This points to the location in the stack at which outgoing arguments should
2401    be written when the stack is pre-pushed (arguments pushed using push
2402    insns always use sp).  */
2403
2404 #define virtual_outgoing_args_rtx       (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
2405
2406 #define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
2407
2408 /* This points to the Canonical Frame Address of the function.  This
2409    should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
2410    but is calculated relative to the arg pointer for simplicity; the
2411    frame pointer nor stack pointer are necessarily fixed relative to
2412    the CFA until after reload.  */
2413
2414 #define virtual_cfa_rtx                 (global_rtl[GR_VIRTUAL_CFA])
2415
2416 #define VIRTUAL_CFA_REGNUM              ((FIRST_VIRTUAL_REGISTER) + 4)
2417
2418 #define LAST_VIRTUAL_POINTER_REGISTER   ((FIRST_VIRTUAL_REGISTER) + 4)
2419
2420 /* This is replaced by crtl->preferred_stack_boundary / BITS_PER_UNIT
2421    when finalized.  */
2422
2423 #define virtual_preferred_stack_boundary_rtx \
2424         (global_rtl[GR_VIRTUAL_PREFERRED_STACK_BOUNDARY])
2425
2426 #define VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM \
2427                                         ((FIRST_VIRTUAL_REGISTER) + 5)
2428
2429 #define LAST_VIRTUAL_REGISTER           ((FIRST_VIRTUAL_REGISTER) + 5)
2430
2431 /* Nonzero if REGNUM is a pointer into the stack frame.  */
2432 #define REGNO_PTR_FRAME_P(REGNUM)               \
2433   ((REGNUM) == STACK_POINTER_REGNUM             \
2434    || (REGNUM) == FRAME_POINTER_REGNUM          \
2435    || (REGNUM) == HARD_FRAME_POINTER_REGNUM     \
2436    || (REGNUM) == ARG_POINTER_REGNUM            \
2437    || ((REGNUM) >= FIRST_VIRTUAL_REGISTER       \
2438        && (REGNUM) <= LAST_VIRTUAL_POINTER_REGISTER))
2439
2440 /* REGNUM never really appearing in the INSN stream.  */
2441 #define INVALID_REGNUM                  (~(unsigned int) 0)
2442
2443 extern rtx output_constant_def (tree, int);
2444 extern rtx lookup_constant_def (tree);
2445
2446 /* Nonzero after end of reload pass.
2447    Set to 1 or 0 by reload1.c.  */
2448
2449 extern int reload_completed;
2450
2451 /* Nonzero after thread_prologue_and_epilogue_insns has run.  */
2452 extern int epilogue_completed;
2453
2454 /* Set to 1 while reload_as_needed is operating.
2455    Required by some machines to handle any generated moves differently.  */
2456
2457 extern int reload_in_progress;
2458
2459 /* Set to 1 while in lra.  */
2460 extern int lra_in_progress;
2461
2462 /* This macro indicates whether you may create a new
2463    pseudo-register.  */
2464
2465 #define can_create_pseudo_p() (!reload_in_progress && !reload_completed)
2466
2467 #ifdef STACK_REGS
2468 /* Nonzero after end of regstack pass.
2469    Set to 1 or 0 by reg-stack.c.  */
2470 extern int regstack_completed;
2471 #endif
2472
2473 /* If this is nonzero, we do not bother generating VOLATILE
2474    around volatile memory references, and we are willing to
2475    output indirect addresses.  If cse is to follow, we reject
2476    indirect addresses so a useful potential cse is generated;
2477    if it is used only once, instruction combination will produce
2478    the same indirect address eventually.  */
2479 extern int cse_not_expected;
2480
2481 /* Translates rtx code to tree code, for those codes needed by
2482    REAL_ARITHMETIC.  The function returns an int because the caller may not
2483    know what `enum tree_code' means.  */
2484
2485 extern int rtx_to_tree_code (enum rtx_code);
2486
2487 /* In cse.c */
2488 extern int delete_trivially_dead_insns (rtx, int);
2489 extern int exp_equiv_p (const_rtx, const_rtx, int, bool);
2490 extern unsigned hash_rtx (const_rtx x, enum machine_mode, int *, int *, bool);
2491
2492 /* In dse.c */
2493 extern bool check_for_inc_dec (rtx insn);
2494
2495 /* In jump.c */
2496 extern int comparison_dominates_p (enum rtx_code, enum rtx_code);
2497 extern bool jump_to_label_p (rtx);
2498 extern int condjump_p (const_rtx);
2499 extern int any_condjump_p (const_rtx);
2500 extern int any_uncondjump_p (const_rtx);
2501 extern rtx pc_set (const_rtx);
2502 extern rtx condjump_label (const_rtx);
2503 extern int simplejump_p (const_rtx);
2504 extern int returnjump_p (rtx);
2505 extern int eh_returnjump_p (rtx);
2506 extern int onlyjump_p (const_rtx);
2507 extern int only_sets_cc0_p (const_rtx);
2508 extern int sets_cc0_p (const_rtx);
2509 extern int invert_jump_1 (rtx, rtx);
2510 extern int invert_jump (rtx, rtx, int);
2511 extern int rtx_renumbered_equal_p (const_rtx, const_rtx);
2512 extern int true_regnum (const_rtx);
2513 extern unsigned int reg_or_subregno (const_rtx);
2514 extern int redirect_jump_1 (rtx, rtx);
2515 extern void redirect_jump_2 (rtx, rtx, rtx, int, int);
2516 extern int redirect_jump (rtx, rtx, int);
2517 extern void rebuild_jump_labels (rtx);
2518 extern void rebuild_jump_labels_chain (rtx);
2519 extern rtx reversed_comparison (const_rtx, enum machine_mode);
2520 extern enum rtx_code reversed_comparison_code (const_rtx, const_rtx);
2521 extern enum rtx_code reversed_comparison_code_parts (enum rtx_code, const_rtx,
2522                                                      const_rtx, const_rtx);
2523 extern void delete_for_peephole (rtx, rtx);
2524 extern int condjump_in_parallel_p (const_rtx);
2525
2526 /* In emit-rtl.c.  */
2527 extern int max_reg_num (void);
2528 extern int max_label_num (void);
2529 extern int get_first_label_num (void);
2530 extern void maybe_set_first_label_num (rtx);
2531 extern void delete_insns_since (rtx);
2532 extern void mark_reg_pointer (rtx, int);
2533 extern void mark_user_reg (rtx);
2534 extern void reset_used_flags (rtx);
2535 extern void set_used_flags (rtx);
2536 extern void reorder_insns (rtx, rtx, rtx);
2537 extern void reorder_insns_nobb (rtx, rtx, rtx);
2538 extern int get_max_insn_count (void);
2539 extern int in_sequence_p (void);
2540 extern void init_emit (void);
2541 extern void init_emit_regs (void);
2542 extern void init_emit_once (void);
2543 extern void push_topmost_sequence (void);
2544 extern void pop_topmost_sequence (void);
2545 extern void set_new_first_and_last_insn (rtx, rtx);
2546 extern unsigned int unshare_all_rtl (void);
2547 extern void unshare_all_rtl_again (rtx);
2548 extern void unshare_all_rtl_in_chain (rtx);
2549 extern void verify_rtl_sharing (void);
2550 extern void link_cc0_insns (rtx);
2551 extern void add_insn (rtx);
2552 extern void add_insn_before (rtx, rtx, basic_block);
2553 extern void add_insn_after (rtx, rtx, basic_block);
2554 extern void remove_insn (rtx);
2555 extern rtx emit (rtx);
2556 extern void delete_insn (rtx);
2557 extern rtx entry_of_function (void);
2558 extern void emit_insn_at_entry (rtx);
2559 extern void delete_insn_chain (rtx, rtx, bool);
2560 extern rtx unlink_insn_chain (rtx, rtx);
2561 extern void delete_insn_and_edges (rtx);
2562 extern rtx gen_lowpart_SUBREG (enum machine_mode, rtx);
2563 extern rtx gen_const_mem (enum machine_mode, rtx);
2564 extern rtx gen_frame_mem (enum machine_mode, rtx);
2565 extern rtx gen_tmp_stack_mem (enum machine_mode, rtx);
2566 extern bool validate_subreg (enum machine_mode, enum machine_mode,
2567                              const_rtx, unsigned int);
2568
2569 /* In combine.c  */
2570 extern unsigned int extended_count (const_rtx, enum machine_mode, int);
2571 extern rtx remove_death (unsigned int, rtx);
2572 extern void dump_combine_stats (FILE *);
2573 extern void dump_combine_total_stats (FILE *);
2574 extern rtx make_compound_operation (rtx, enum rtx_code);
2575
2576 /* In cfgcleanup.c  */
2577 extern void delete_dead_jumptables (void);
2578
2579 /* In sched-vis.c.  */
2580 extern void debug_bb_n_slim (int);
2581 extern void debug_bb_slim (struct basic_block_def *);
2582 extern void print_value_slim (FILE *, const_rtx, int);
2583 extern void debug_rtl_slim (FILE *, const_rtx, const_rtx, int, int);
2584 extern void dump_insn_slim (FILE *f, const_rtx x);
2585 extern void debug_insn_slim (const_rtx x);
2586
2587 /* In sched-rgn.c.  */
2588 extern void schedule_insns (void);
2589
2590 /* In sched-ebb.c.  */
2591 extern void schedule_ebbs (void);
2592
2593 /* In sel-sched-dump.c.  */
2594 extern void sel_sched_fix_param (const char *param, const char *val);
2595
2596 /* In print-rtl.c */
2597 extern const char *print_rtx_head;
2598 extern void debug_rtx (const_rtx);
2599 extern void debug_rtx_list (const_rtx, int);
2600 extern void debug_rtx_range (const_rtx, const_rtx);
2601 extern const_rtx debug_rtx_find (const_rtx, int);
2602 extern void print_mem_expr (FILE *, const_tree);
2603 extern void print_rtl (FILE *, const_rtx);
2604 extern void print_simple_rtl (FILE *, const_rtx);
2605 extern int print_rtl_single (FILE *, const_rtx);
2606 extern int print_rtl_single_with_indent (FILE *, const_rtx, int);
2607 extern void print_inline_rtx (FILE *, const_rtx, int);
2608
2609 /* In function.c */
2610 extern void reposition_prologue_and_epilogue_notes (void);
2611 extern int prologue_epilogue_contains (const_rtx);
2612 extern int sibcall_epilogue_contains (const_rtx);
2613 extern void update_temp_slot_address (rtx, rtx);
2614 extern void maybe_copy_prologue_epilogue_insn (rtx, rtx);
2615 extern void set_return_jump_label (rtx);
2616
2617 /* In stmt.c */
2618 extern void expand_null_return (void);
2619 extern void expand_naked_return (void);
2620 extern void emit_jump (rtx);
2621
2622 /* In expr.c */
2623 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
2624                            unsigned int, int);
2625 extern HOST_WIDE_INT find_args_size_adjust (rtx);
2626 extern int fixup_args_size_notes (rtx, rtx, int);
2627
2628 /* In cfgrtl.c */
2629 extern void print_rtl_with_bb (FILE *, const_rtx, int);
2630 extern rtx duplicate_insn_chain (rtx, rtx);
2631
2632 /* In expmed.c */
2633 extern void init_expmed (void);
2634 extern void expand_inc (rtx, rtx);
2635 extern void expand_dec (rtx, rtx);
2636
2637 /* In lower-subreg.c */
2638 extern void init_lower_subreg (void);
2639
2640 /* In gcse.c */
2641 extern bool can_copy_p (enum machine_mode);
2642 extern bool can_assign_to_reg_without_clobbers_p (rtx);
2643 extern rtx fis_get_condition (rtx);
2644
2645 /* In ira.c */
2646 #ifdef HARD_CONST
2647 extern HARD_REG_SET eliminable_regset;
2648 #endif
2649 extern void mark_elimination (int, int);
2650
2651 /* In reginfo.c */
2652 extern int reg_classes_intersect_p (reg_class_t, reg_class_t);
2653 extern int reg_class_subset_p (reg_class_t, reg_class_t);
2654 extern void globalize_reg (tree, int);
2655 extern void init_reg_modes_target (void);
2656 extern void init_regs (void);
2657 extern void reinit_regs (void);
2658 extern void init_fake_stack_mems (void);
2659 extern void save_register_info (void);
2660 extern void init_reg_sets (void);
2661 extern void regclass (rtx, int);
2662 extern void reg_scan (rtx, unsigned int);
2663 extern void fix_register (const char *, int, int);
2664 extern bool invalid_mode_change_p (unsigned int, enum reg_class);
2665
2666 /* In reorg.c */
2667 extern void dbr_schedule (rtx);
2668
2669 /* In reload1.c */
2670 extern int function_invariant_p (const_rtx);
2671
2672 /* In calls.c */
2673 enum libcall_type
2674 {
2675   LCT_NORMAL = 0,
2676   LCT_CONST = 1,
2677   LCT_PURE = 2,
2678   LCT_NORETURN = 3,
2679   LCT_THROW = 4,
2680   LCT_RETURNS_TWICE = 5
2681 };
2682
2683 extern void emit_library_call (rtx, enum libcall_type, enum machine_mode, int,
2684                                ...);
2685 extern rtx emit_library_call_value (rtx, rtx, enum libcall_type,
2686                                     enum machine_mode, int, ...);
2687
2688 /* In varasm.c */
2689 extern void init_varasm_once (void);
2690
2691 extern rtx make_debug_expr_from_rtl (const_rtx);
2692
2693 /* In read-rtl.c */
2694 extern bool read_rtx (const char *, rtx *);
2695
2696 /* In alias.c */
2697 extern rtx canon_rtx (rtx);
2698 extern int true_dependence (const_rtx, enum machine_mode, const_rtx);
2699 extern rtx get_addr (rtx);
2700 extern int canon_true_dependence (const_rtx, enum machine_mode, rtx,
2701                                   const_rtx, rtx);
2702 extern int read_dependence (const_rtx, const_rtx);
2703 extern int anti_dependence (const_rtx, const_rtx);
2704 extern int output_dependence (const_rtx, const_rtx);
2705 extern int may_alias_p (const_rtx, const_rtx);
2706 extern void init_alias_target (void);
2707 extern void init_alias_analysis (void);
2708 extern void end_alias_analysis (void);
2709 extern void vt_equate_reg_base_value (const_rtx, const_rtx);
2710 extern bool memory_modified_in_insn_p (const_rtx, const_rtx);
2711 extern bool memory_must_be_modified_in_insn_p (const_rtx, const_rtx);
2712 extern bool may_be_sp_based_p (rtx);
2713 extern rtx gen_hard_reg_clobber (enum machine_mode, unsigned int);
2714 extern rtx get_reg_known_value (unsigned int);
2715 extern bool get_reg_known_equiv_p (unsigned int);
2716 extern rtx get_reg_base_value (unsigned int);
2717
2718 #ifdef STACK_REGS
2719 extern int stack_regs_mentioned (const_rtx insn);
2720 #endif
2721
2722 /* In toplev.c */
2723 extern GTY(()) rtx stack_limit_rtx;
2724
2725 /* In predict.c */
2726 extern void invert_br_probabilities (rtx);
2727 extern bool expensive_function_p (int);
2728
2729 /* In var-tracking.c */
2730 extern unsigned int variable_tracking_main (void);
2731
2732 /* In stor-layout.c.  */
2733 extern void get_mode_bounds (enum machine_mode, int, enum machine_mode,
2734                              rtx *, rtx *);
2735
2736 /* In loop-unswitch.c  */
2737 extern rtx reversed_condition (rtx);
2738 extern rtx compare_and_jump_seq (rtx, rtx, enum rtx_code, rtx, int, rtx);
2739
2740 /* In loop-iv.c  */
2741 extern rtx canon_condition (rtx);
2742 extern void simplify_using_condition (rtx, rtx *, bitmap);
2743
2744 /* In final.c  */
2745 extern unsigned int compute_alignments (void);
2746 extern int asm_str_count (const char *templ);
2747 \f
2748 struct rtl_hooks
2749 {
2750   rtx (*gen_lowpart) (enum machine_mode, rtx);
2751   rtx (*gen_lowpart_no_emit) (enum machine_mode, rtx);
2752   rtx (*reg_nonzero_bits) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2753                            unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
2754   rtx (*reg_num_sign_bit_copies) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2755                                   unsigned int, unsigned int *);
2756   bool (*reg_truncated_to_mode) (enum machine_mode, const_rtx);
2757
2758   /* Whenever you add entries here, make sure you adjust rtlhooks-def.h.  */
2759 };
2760
2761 /* Each pass can provide its own.  */
2762 extern struct rtl_hooks rtl_hooks;
2763
2764 /* ... but then it has to restore these.  */
2765 extern const struct rtl_hooks general_rtl_hooks;
2766
2767 /* Keep this for the nonce.  */
2768 #define gen_lowpart rtl_hooks.gen_lowpart
2769
2770 extern void insn_locations_init (void);
2771 extern void insn_locations_finalize (void);
2772 extern void set_curr_insn_location (location_t);
2773 extern location_t curr_insn_location (void);
2774 extern bool optimize_insn_for_size_p (void);
2775 extern bool optimize_insn_for_speed_p (void);
2776
2777 /* rtl-error.c */
2778 extern void _fatal_insn_not_found (const_rtx, const char *, int, const char *)
2779      ATTRIBUTE_NORETURN;
2780 extern void _fatal_insn (const char *, const_rtx, const char *, int, const char *)
2781      ATTRIBUTE_NORETURN;
2782
2783 #define fatal_insn(msgid, insn) \
2784         _fatal_insn (msgid, insn, __FILE__, __LINE__, __FUNCTION__)
2785 #define fatal_insn_not_found(insn) \
2786         _fatal_insn_not_found (insn, __FILE__, __LINE__, __FUNCTION__)
2787
2788
2789
2790 #endif /* ! GCC_RTL_H */