gcc/rtl.h

   1 /* Register Transfer Language (RTL) definitions for GCC
   2    Copyright (C) 1987-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_RTL_H
  21 #define GCC_RTL_H
  22
  23 #include "statistics.h"
  24 #include "machmode.h"
  25 #include "input.h"
  26 #include "real.h"
  27 #include "vec.h"
  28 #include "fixed-value.h"
  29 #include "alias.h"
  30 #include "hashtab.h"
  31 #include "flags.h"
  32
  33 /* Value used by some passes to "recognize" noop moves as valid
  34  instructions.  */
  35 #define NOOP_MOVE_INSN_CODE     INT_MAX
  36
  37 /* Register Transfer Language EXPRESSIONS CODES */
  38
  39 #define RTX_CODE        enum rtx_code
  40 enum rtx_code  {
  41
  42 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
  43 #include "rtl.def"              /* rtl expressions are documented here */
  44 #undef DEF_RTL_EXPR
  45
  46   LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
  47                                    NUM_RTX_CODE.
  48                                    Assumes default enum value assignment.  */
  49
  50 /* The cast here, saves many elsewhere.  */
  51 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
  52
  53 /* Similar, but since generator files get more entries... */
  54 #ifdef GENERATOR_FILE
  55 # define NON_GENERATOR_NUM_RTX_CODE ((int) MATCH_OPERAND)
  56 #endif
  57
  58 /* Register Transfer Language EXPRESSIONS CODE CLASSES */
  59
  60 enum rtx_class  {
  61   /* We check bit 0-1 of some rtx class codes in the predicates below.  */
  62
  63   /* Bit 0 = comparison if 0, arithmetic is 1
  64      Bit 1 = 1 if commutative.  */
  65   RTX_COMPARE,          /* 0 */
  66   RTX_COMM_COMPARE,
  67   RTX_BIN_ARITH,
  68   RTX_COMM_ARITH,
  69
  70   /* Must follow the four preceding values.  */
  71   RTX_UNARY,            /* 4 */
  72
  73   RTX_EXTRA,
  74   RTX_MATCH,
  75   RTX_INSN,
  76
  77   /* Bit 0 = 1 if constant.  */
  78   RTX_OBJ,              /* 8 */
  79   RTX_CONST_OBJ,
  80
  81   RTX_TERNARY,
  82   RTX_BITFIELD_OPS,
  83   RTX_AUTOINC
  84 };
  85
  86 #define RTX_OBJ_MASK (~1)
  87 #define RTX_OBJ_RESULT (RTX_OBJ & RTX_OBJ_MASK)
  88 #define RTX_COMPARE_MASK (~1)
  89 #define RTX_COMPARE_RESULT (RTX_COMPARE & RTX_COMPARE_MASK)
  90 #define RTX_ARITHMETIC_MASK (~1)
  91 #define RTX_ARITHMETIC_RESULT (RTX_COMM_ARITH & RTX_ARITHMETIC_MASK)
  92 #define RTX_BINARY_MASK (~3)
  93 #define RTX_BINARY_RESULT (RTX_COMPARE & RTX_BINARY_MASK)
  94 #define RTX_COMMUTATIVE_MASK (~2)
  95 #define RTX_COMMUTATIVE_RESULT (RTX_COMM_COMPARE & RTX_COMMUTATIVE_MASK)
  96 #define RTX_NON_COMMUTATIVE_RESULT (RTX_COMPARE & RTX_COMMUTATIVE_MASK)
  97
  98 extern const unsigned char rtx_length[NUM_RTX_CODE];
  99 #define GET_RTX_LENGTH(CODE)            (rtx_length[(int) (CODE)])
 100
 101 extern const char * const rtx_name[NUM_RTX_CODE];
 102 #define GET_RTX_NAME(CODE)              (rtx_name[(int) (CODE)])
 103
 104 extern const char * const rtx_format[NUM_RTX_CODE];
 105 #define GET_RTX_FORMAT(CODE)            (rtx_format[(int) (CODE)])
 106
 107 extern const enum rtx_class rtx_class[NUM_RTX_CODE];
 108 #define GET_RTX_CLASS(CODE)             (rtx_class[(int) (CODE)])
 109
 110 extern const unsigned char rtx_code_size[NUM_RTX_CODE];
 111 extern const unsigned char rtx_next[NUM_RTX_CODE];
 112 \f
 113 /* The flags and bitfields of an ADDR_DIFF_VEC.  BASE is the base label
 114    relative to which the offsets are calculated, as explained in rtl.def.  */
 115 typedef struct
 116 {
 117   /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
 118   unsigned min_align: 8;
 119   /* Flags: */
 120   unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC.  */
 121   unsigned min_after_vec: 1;  /* minimum address target label is
 122                                  after the ADDR_DIFF_VEC.  */
 123   unsigned max_after_vec: 1;  /* maximum address target label is
 124                                  after the ADDR_DIFF_VEC.  */
 125   unsigned min_after_base: 1; /* minimum address target label is
 126                                  after BASE.  */
 127   unsigned max_after_base: 1; /* maximum address target label is
 128                                  after BASE.  */
 129   /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
 130   unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned.  */
 131   unsigned : 2;
 132   unsigned scale : 8;
 133 } addr_diff_vec_flags;
 134
 135 /* Structure used to describe the attributes of a MEM.  These are hashed
 136    so MEMs that the same attributes share a data structure.  This means
 137    they cannot be modified in place.  */
 138 typedef struct GTY(()) mem_attrs
 139 {
 140   /* The expression that the MEM accesses, or null if not known.
 141      This expression might be larger than the memory reference itself.
 142      (In other words, the MEM might access only part of the object.)  */
 143   tree expr;
 144
 145   /* The offset of the memory reference from the start of EXPR.
 146      Only valid if OFFSET_KNOWN_P.  */
 147   HOST_WIDE_INT offset;
 148
 149   /* The size of the memory reference in bytes.  Only valid if
 150      SIZE_KNOWN_P.  */
 151   HOST_WIDE_INT size;
 152
 153   /* The alias set of the memory reference.  */
 154   alias_set_type alias;
 155
 156   /* The alignment of the reference in bits.  Always a multiple of
 157      BITS_PER_UNIT.  Note that EXPR may have a stricter alignment
 158      than the memory reference itself.  */
 159   unsigned int align;
 160
 161   /* The address space that the memory reference uses.  */
 162   unsigned char addrspace;
 163
 164   /* True if OFFSET is known.  */
 165   bool offset_known_p;
 166
 167   /* True if SIZE is known.  */
 168   bool size_known_p;
 169 } mem_attrs;
 170
 171 /* Structure used to describe the attributes of a REG in similar way as
 172    mem_attrs does for MEM above.  Note that the OFFSET field is calculated
 173    in the same way as for mem_attrs, rather than in the same way as a
 174    SUBREG_BYTE.  For example, if a big-endian target stores a byte
 175    object in the low part of a 4-byte register, the OFFSET field
 176    will be -3 rather than 0.  */
 177
 178 typedef struct GTY(()) reg_attrs {
 179   tree decl;                    /* decl corresponding to REG.  */
 180   HOST_WIDE_INT offset;         /* Offset from start of DECL.  */
 181 } reg_attrs;
 182
 183 /* Common union for an element of an rtx.  */
 184
 185 union rtunion_def
 186 {
 187   int rt_int;
 188   unsigned int rt_uint;
 189   const char *rt_str;
 190   rtx rt_rtx;
 191   rtvec rt_rtvec;
 192   enum machine_mode rt_type;
 193   addr_diff_vec_flags rt_addr_diff_vec_flags;
 194   struct cselib_val_struct *rt_cselib;
 195   tree rt_tree;
 196   basic_block rt_bb;
 197   mem_attrs *rt_mem;
 198   reg_attrs *rt_reg;
 199   struct constant_descriptor_rtx *rt_constant;
 200   struct dw_cfi_struct *rt_cfi;
 201 };
 202 typedef union rtunion_def rtunion;
 203
 204 /* This structure remembers the position of a SYMBOL_REF within an
 205    object_block structure.  A SYMBOL_REF only provides this information
 206    if SYMBOL_REF_HAS_BLOCK_INFO_P is true.  */
 207 struct GTY(()) block_symbol {
 208   /* The usual SYMBOL_REF fields.  */
 209   rtunion GTY ((skip)) fld[3];
 210
 211   /* The block that contains this object.  */
 212   struct object_block *block;
 213
 214   /* The offset of this object from the start of its block.  It is negative
 215      if the symbol has not yet been assigned an offset.  */
 216   HOST_WIDE_INT offset;
 217 };
 218
 219 /* Describes a group of objects that are to be placed together in such
 220    a way that their relative positions are known.  */
 221 struct GTY(()) object_block {
 222   /* The section in which these objects should be placed.  */
 223   section *sect;
 224
 225   /* The alignment of the first object, measured in bits.  */
 226   unsigned int alignment;
 227
 228   /* The total size of the objects, measured in bytes.  */
 229   HOST_WIDE_INT size;
 230
 231   /* The SYMBOL_REFs for each object.  The vector is sorted in
 232      order of increasing offset and the following conditions will
 233      hold for each element X:
 234
 235          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 236          !SYMBOL_REF_ANCHOR_P (X)
 237          SYMBOL_REF_BLOCK (X) == [address of this structure]
 238          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 239   vec<rtx, va_gc> *objects;
 240
 241   /* All the anchor SYMBOL_REFs used to address these objects, sorted
 242      in order of increasing offset, and then increasing TLS model.
 243      The following conditions will hold for each element X in this vector:
 244
 245          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 246          SYMBOL_REF_ANCHOR_P (X)
 247          SYMBOL_REF_BLOCK (X) == [address of this structure]
 248          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 249   vec<rtx, va_gc> *anchors;
 250 };
 251
 252 /* RTL expression ("rtx").  */
 253
 254 struct GTY((chain_next ("RTX_NEXT (&%h)"),
 255             chain_prev ("RTX_PREV (&%h)"), variable_size)) rtx_def {
 256   /* The kind of expression this is.  */
 257   ENUM_BITFIELD(rtx_code) code: 16;
 258
 259   /* The kind of value the expression has.  */
 260   ENUM_BITFIELD(machine_mode) mode : 8;
 261
 262   /* 1 in a MEM if we should keep the alias set for this mem unchanged
 263      when we access a component.
 264      1 in a CALL_INSN if it is a sibling call.
 265      1 in a SET that is for a return.
 266      In a CODE_LABEL, part of the two-bit alternate entry field.
 267      1 in a CONCAT is VAL_EXPR_IS_COPIED in var-tracking.c.
 268      1 in a VALUE is SP_BASED_VALUE_P in cselib.c.
 269      1 in a SUBREG generated by LRA for reload insns.  */
 270   unsigned int jump : 1;
 271   /* In a CODE_LABEL, part of the two-bit alternate entry field.
 272      1 in a MEM if it cannot trap.
 273      1 in a CALL_INSN logically equivalent to
 274        ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
 275   unsigned int call : 1;
 276   /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
 277      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 278      1 in a SYMBOL_REF if it addresses something in the per-function
 279      constants pool.
 280      1 in a CALL_INSN logically equivalent to ECF_CONST and TREE_READONLY.
 281      1 in a NOTE, or EXPR_LIST for a const call.
 282      1 in a JUMP_INSN of an annulling branch.
 283      1 in a CONCAT is VAL_EXPR_IS_CLOBBERED in var-tracking.c.
 284      1 in a preserved VALUE is PRESERVED_VALUE_P in cselib.c.
 285      1 in a clobber temporarily created for LRA.  */
 286   unsigned int unchanging : 1;
 287   /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
 288      1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
 289      if it has been deleted.
 290      1 in a REG expression if corresponds to a variable declared by the user,
 291      0 for an internally generated temporary.
 292      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 293      1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
 294      non-local label.
 295      In a SYMBOL_REF, this flag is used for machine-specific purposes.
 296      In a PREFETCH, this flag indicates that it should be considered a scheduling
 297      barrier.
 298      1 in a CONCAT is VAL_NEEDS_RESOLUTION in var-tracking.c.  */
 299   unsigned int volatil : 1;
 300   /* 1 in a REG if the register is used only in exit code a loop.
 301      1 in a SUBREG expression if was generated from a variable with a
 302      promoted mode.
 303      1 in a CODE_LABEL if the label is used for nonlocal gotos
 304      and must not be deleted even if its count is zero.
 305      1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
 306      together with the preceding insn.  Valid only within sched.
 307      1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
 308      from the target of a branch.  Valid from reorg until end of compilation;
 309      cleared before used.
 310
 311      The name of the field is historical.  It used to be used in MEMs
 312      to record whether the MEM accessed part of a structure.  */
 313   unsigned int in_struct : 1;
 314   /* At the end of RTL generation, 1 if this rtx is used.  This is used for
 315      copying shared structure.  See `unshare_all_rtl'.
 316      In a REG, this is not needed for that purpose, and used instead
 317      in `leaf_renumber_regs_insn'.
 318      1 in a SYMBOL_REF, means that emit_library_call
 319      has used it as the function.
 320      1 in a CONCAT is VAL_HOLDS_TRACK_EXPR in var-tracking.c.
 321      1 in a VALUE or DEBUG_EXPR is VALUE_RECURSED_INTO in var-tracking.c.  */
 322   unsigned int used : 1;
 323   /* 1 in an INSN or a SET if this rtx is related to the call frame,
 324      either changing how we compute the frame address or saving and
 325      restoring registers in the prologue and epilogue.
 326      1 in a REG or MEM if it is a pointer.
 327      1 in a SYMBOL_REF if it addresses something in the per-function
 328      constant string pool.
 329      1 in a VALUE is VALUE_CHANGED in var-tracking.c.  */
 330   unsigned frame_related : 1;
 331   /* 1 in a REG or PARALLEL that is the current function's return value.
 332      1 in a SYMBOL_REF for a weak symbol.
 333      1 in a CALL_INSN logically equivalent to ECF_PURE and DECL_PURE_P.
 334      1 in a CONCAT is VAL_EXPR_HAS_REVERSE in var-tracking.c.
 335      1 in a VALUE or DEBUG_EXPR is NO_LOC_P in var-tracking.c.  */
 336   unsigned return_val : 1;
 337
 338   /* The first element of the operands of this rtx.
 339      The number of operands and their types are controlled
 340      by the `code' field, according to rtl.def.  */
 341   union u {
 342     rtunion fld[1];
 343     HOST_WIDE_INT hwint[1];
 344     struct block_symbol block_sym;
 345     struct real_value rv;
 346     struct fixed_value fv;
 347   } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
 348 };
 349
 350 /* The size in bytes of an rtx header (code, mode and flags).  */
 351 #define RTX_HDR_SIZE offsetof (struct rtx_def, u)
 352
 353 /* The size in bytes of an rtx with code CODE.  */
 354 #define RTX_CODE_SIZE(CODE) rtx_code_size[CODE]
 355
 356 #define NULL_RTX (rtx) 0
 357
 358 /* The "next" and "previous" RTX, relative to this one.  */
 359
 360 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL                 \
 361                      : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
 362
 363 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
 364  */
 365 #define RTX_PREV(X) ((INSN_P (X)                        \
 366                       || NOTE_P (X)                     \
 367                       || JUMP_TABLE_DATA_P (X)          \
 368                       || BARRIER_P (X)                  \
 369                       || LABEL_P (X))                   \
 370                      && PREV_INSN (X) != NULL           \
 371                      && NEXT_INSN (PREV_INSN (X)) == X  \
 372                      ? PREV_INSN (X) : NULL)
 373
 374 /* Define macros to access the `code' field of the rtx.  */
 375
 376 #define GET_CODE(RTX)       ((enum rtx_code) (RTX)->code)
 377 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
 378
 379 #define GET_MODE(RTX)       ((enum machine_mode) (RTX)->mode)
 380 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
 381
 382 /* RTL vector.  These appear inside RTX's when there is a need
 383    for a variable number of things.  The principle use is inside
 384    PARALLEL expressions.  */
 385
 386 struct GTY((variable_size)) rtvec_def {
 387   int num_elem;         /* number of elements */
 388   rtx GTY ((length ("%h.num_elem"))) elem[1];
 389 };
 390
 391 #define NULL_RTVEC (rtvec) 0
 392
 393 #define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
 394 #define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (NUM))
 395
 396 /* Predicate yielding nonzero iff X is an rtx for a register.  */
 397 #define REG_P(X) (GET_CODE (X) == REG)
 398
 399 /* Predicate yielding nonzero iff X is an rtx for a memory location.  */
 400 #define MEM_P(X) (GET_CODE (X) == MEM)
 401
 402 /* Match CONST_*s that can represent compile-time constant integers.  */
 403 #define CASE_CONST_SCALAR_INT \
 404    case CONST_INT: \
 405    case CONST_DOUBLE
 406
 407 /* Match CONST_*s for which pointer equality corresponds to value equality.  */
 408 #define CASE_CONST_UNIQUE \
 409    case CONST_INT: \
 410    case CONST_DOUBLE: \
 411    case CONST_FIXED
 412
 413 /* Match all CONST_* rtxes.  */
 414 #define CASE_CONST_ANY \
 415    case CONST_INT: \
 416    case CONST_DOUBLE: \
 417    case CONST_FIXED: \
 418    case CONST_VECTOR
 419
 420 /* Predicate yielding nonzero iff X is an rtx for a constant integer.  */
 421 #define CONST_INT_P(X) (GET_CODE (X) == CONST_INT)
 422
 423 /* Predicate yielding nonzero iff X is an rtx for a constant fixed-point.  */
 424 #define CONST_FIXED_P(X) (GET_CODE (X) == CONST_FIXED)
 425
 426 /* Predicate yielding true iff X is an rtx for a double-int
 427    or floating point constant.  */
 428 #define CONST_DOUBLE_P(X) (GET_CODE (X) == CONST_DOUBLE)
 429
 430 /* Predicate yielding true iff X is an rtx for a double-int.  */
 431 #define CONST_DOUBLE_AS_INT_P(X) \
 432   (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == VOIDmode)
 433
 434 /* Predicate yielding true iff X is an rtx for a integer const.  */
 435 #define CONST_SCALAR_INT_P(X) \
 436   (CONST_INT_P (X) || CONST_DOUBLE_AS_INT_P (X))
 437
 438 /* Predicate yielding true iff X is an rtx for a double-int.  */
 439 #define CONST_DOUBLE_AS_FLOAT_P(X) \
 440   (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode)
 441
 442 /* Predicate yielding nonzero iff X is a label insn.  */
 443 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
 444
 445 /* Predicate yielding nonzero iff X is a jump insn.  */
 446 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
 447
 448 /* Predicate yielding nonzero iff X is a call insn.  */
 449 #define CALL_P(X) (GET_CODE (X) == CALL_INSN)
 450
 451 /* Predicate yielding nonzero iff X is an insn that cannot jump.  */
 452 #define NONJUMP_INSN_P(X) (GET_CODE (X) == INSN)
 453
 454 /* Predicate yielding nonzero iff X is a debug note/insn.  */
 455 #define DEBUG_INSN_P(X) (GET_CODE (X) == DEBUG_INSN)
 456
 457 /* Predicate yielding nonzero iff X is an insn that is not a debug insn.  */
 458 #define NONDEBUG_INSN_P(X) (INSN_P (X) && !DEBUG_INSN_P (X))
 459
 460 /* Nonzero if DEBUG_INSN_P may possibly hold.  */
 461 #define MAY_HAVE_DEBUG_INSNS (flag_var_tracking_assignments)
 462
 463 /* Predicate yielding nonzero iff X is a real insn.  */
 464 #define INSN_P(X) \
 465   (NONJUMP_INSN_P (X) || DEBUG_INSN_P (X) || JUMP_P (X) || CALL_P (X))
 466
 467 /* Predicate yielding nonzero iff X is a note insn.  */
 468 #define NOTE_P(X) (GET_CODE (X) == NOTE)
 469
 470 /* Predicate yielding nonzero iff X is a barrier insn.  */
 471 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
 472
 473 /* Predicate yielding nonzero iff X is a data for a jump table.  */
 474 #define JUMP_TABLE_DATA_P(INSN) (GET_CODE (INSN) == JUMP_TABLE_DATA)
 475
 476 /* Predicate yielding nonzero iff X is a return or simple_return.  */
 477 #define ANY_RETURN_P(X) \
 478   (GET_CODE (X) == RETURN || GET_CODE (X) == SIMPLE_RETURN)
 479
 480 /* 1 if X is a unary operator.  */
 481
 482 #define UNARY_P(X)   \
 483   (GET_RTX_CLASS (GET_CODE (X)) == RTX_UNARY)
 484
 485 /* 1 if X is a binary operator.  */
 486
 487 #define BINARY_P(X)   \
 488   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_BINARY_MASK) == RTX_BINARY_RESULT)
 489
 490 /* 1 if X is an arithmetic operator.  */
 491
 492 #define ARITHMETIC_P(X)   \
 493   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_ARITHMETIC_MASK)                 \
 494     == RTX_ARITHMETIC_RESULT)
 495
 496 /* 1 if X is an arithmetic operator.  */
 497
 498 #define COMMUTATIVE_ARITH_P(X)   \
 499   (GET_RTX_CLASS (GET_CODE (X)) == RTX_COMM_ARITH)
 500
 501 /* 1 if X is a commutative arithmetic operator or a comparison operator.
 502    These two are sometimes selected together because it is possible to
 503    swap the two operands.  */
 504
 505 #define SWAPPABLE_OPERANDS_P(X)   \
 506   ((1 << GET_RTX_CLASS (GET_CODE (X)))                                  \
 507     & ((1 << RTX_COMM_ARITH) | (1 << RTX_COMM_COMPARE)                  \
 508        | (1 << RTX_COMPARE)))
 509
 510 /* 1 if X is a non-commutative operator.  */
 511
 512 #define NON_COMMUTATIVE_P(X)   \
 513   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 514     == RTX_NON_COMMUTATIVE_RESULT)
 515
 516 /* 1 if X is a commutative operator on integers.  */
 517
 518 #define COMMUTATIVE_P(X)   \
 519   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 520     == RTX_COMMUTATIVE_RESULT)
 521
 522 /* 1 if X is a relational operator.  */
 523
 524 #define COMPARISON_P(X)   \
 525   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMPARE_MASK) == RTX_COMPARE_RESULT)
 526
 527 /* 1 if X is a constant value that is an integer.  */
 528
 529 #define CONSTANT_P(X)   \
 530   (GET_RTX_CLASS (GET_CODE (X)) == RTX_CONST_OBJ)
 531
 532 /* 1 if X can be used to represent an object.  */
 533 #define OBJECT_P(X)                                                     \
 534   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_OBJ_MASK) == RTX_OBJ_RESULT)
 535
 536 /* General accessor macros for accessing the fields of an rtx.  */
 537
 538 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 539 /* The bit with a star outside the statement expr and an & inside is
 540    so that N can be evaluated only once.  */
 541 #define RTL_CHECK1(RTX, N, C1) __extension__                            \
 542 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 543      const enum rtx_code _code = GET_CODE (_rtx);                       \
 544      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 545        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 546                                 __FUNCTION__);                          \
 547      if (GET_RTX_FORMAT (_code)[_n] != C1)                              \
 548        rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__,        \
 549                                __FUNCTION__);                           \
 550      &_rtx->u.fld[_n]; }))
 551
 552 #define RTL_CHECK2(RTX, N, C1, C2) __extension__                        \
 553 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 554      const enum rtx_code _code = GET_CODE (_rtx);                       \
 555      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 556        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 557                                 __FUNCTION__);                          \
 558      if (GET_RTX_FORMAT (_code)[_n] != C1                               \
 559          && GET_RTX_FORMAT (_code)[_n] != C2)                           \
 560        rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__,    \
 561                                __FUNCTION__);                           \
 562      &_rtx->u.fld[_n]; }))
 563
 564 #define RTL_CHECKC1(RTX, N, C) __extension__                            \
 565 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 566      if (GET_CODE (_rtx) != (C))                                        \
 567        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 568                                __FUNCTION__);                           \
 569      &_rtx->u.fld[_n]; }))
 570
 571 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__                       \
 572 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 573      const enum rtx_code _code = GET_CODE (_rtx);                       \
 574      if (_code != (C1) && _code != (C2))                                \
 575        rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__,    \
 576                                __FUNCTION__); \
 577      &_rtx->u.fld[_n]; }))
 578
 579 #define RTVEC_ELT(RTVEC, I) __extension__                               \
 580 (*({ __typeof (RTVEC) const _rtvec = (RTVEC); const int _i = (I);       \
 581      if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec))                         \
 582        rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__,       \
 583                                   __FUNCTION__);                        \
 584      &_rtvec->elem[_i]; }))
 585
 586 #define XWINT(RTX, N) __extension__                                     \
 587 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 588      const enum rtx_code _code = GET_CODE (_rtx);                       \
 589      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 590        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 591                                 __FUNCTION__);                          \
 592      if (GET_RTX_FORMAT (_code)[_n] != 'w')                             \
 593        rtl_check_failed_type1 (_rtx, _n, 'w', __FILE__, __LINE__,       \
 594                                __FUNCTION__);                           \
 595      &_rtx->u.hwint[_n]; }))
 596
 597 #define XCWINT(RTX, N, C) __extension__                                 \
 598 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 599      if (GET_CODE (_rtx) != (C))                                        \
 600        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 601                                __FUNCTION__);                           \
 602      &_rtx->u.hwint[N]; }))
 603
 604 #define XCMWINT(RTX, N, C, M) __extension__                             \
 605 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 606      if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) != (M))              \
 607        rtl_check_failed_code_mode (_rtx, (C), (M), false, __FILE__,     \
 608                                    __LINE__, __FUNCTION__);             \
 609      &_rtx->u.hwint[N]; }))
 610
 611 #define XCNMPRV(RTX, C, M) __extension__                                \
 612 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 613    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 614      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 615                                  __LINE__, __FUNCTION__);               \
 616    &_rtx->u.rv; })
 617
 618 #define XCNMPFV(RTX, C, M) __extension__                                \
 619 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 620    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 621      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 622                                  __LINE__, __FUNCTION__);               \
 623    &_rtx->u.fv; })
 624
 625 #define BLOCK_SYMBOL_CHECK(RTX) __extension__                           \
 626 ({ __typeof (RTX) const _symbol = (RTX);                                \
 627    const unsigned int flags = RTL_CHECKC1 (_symbol, 1, SYMBOL_REF).rt_int; \
 628    if ((flags & SYMBOL_FLAG_HAS_BLOCK_INFO) == 0)                       \
 629      rtl_check_failed_block_symbol (__FILE__, __LINE__,                 \
 630                                     __FUNCTION__);                      \
 631    &_symbol->u.block_sym; })
 632
 633 extern void rtl_check_failed_bounds (const_rtx, int, const char *, int,
 634                                      const char *)
 635     ATTRIBUTE_NORETURN;
 636 extern void rtl_check_failed_type1 (const_rtx, int, int, const char *, int,
 637                                     const char *)
 638     ATTRIBUTE_NORETURN;
 639 extern void rtl_check_failed_type2 (const_rtx, int, int, int, const char *,
 640                                     int, const char *)
 641     ATTRIBUTE_NORETURN;
 642 extern void rtl_check_failed_code1 (const_rtx, enum rtx_code, const char *,
 643                                     int, const char *)
 644     ATTRIBUTE_NORETURN;
 645 extern void rtl_check_failed_code2 (const_rtx, enum rtx_code, enum rtx_code,
 646                                     const char *, int, const char *)
 647     ATTRIBUTE_NORETURN;
 648 extern void rtl_check_failed_code_mode (const_rtx, enum rtx_code, enum machine_mode,
 649                                         bool, const char *, int, const char *)
 650     ATTRIBUTE_NORETURN;
 651 extern void rtl_check_failed_block_symbol (const char *, int, const char *)
 652     ATTRIBUTE_NORETURN;
 653 extern void rtvec_check_failed_bounds (const_rtvec, int, const char *, int,
 654                                        const char *)
 655     ATTRIBUTE_NORETURN;
 656
 657 #else   /* not ENABLE_RTL_CHECKING */
 658
 659 #define RTL_CHECK1(RTX, N, C1)      ((RTX)->u.fld[N])
 660 #define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->u.fld[N])
 661 #define RTL_CHECKC1(RTX, N, C)      ((RTX)->u.fld[N])
 662 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->u.fld[N])
 663 #define RTVEC_ELT(RTVEC, I)         ((RTVEC)->elem[I])
 664 #define XWINT(RTX, N)               ((RTX)->u.hwint[N])
 665 #define XCWINT(RTX, N, C)           ((RTX)->u.hwint[N])
 666 #define XCMWINT(RTX, N, C, M)       ((RTX)->u.hwint[N])
 667 #define XCNMWINT(RTX, N, C, M)      ((RTX)->u.hwint[N])
 668 #define XCNMPRV(RTX, C, M)          (&(RTX)->u.rv)
 669 #define XCNMPFV(RTX, C, M)          (&(RTX)->u.fv)
 670 #define BLOCK_SYMBOL_CHECK(RTX)     (&(RTX)->u.block_sym)
 671
 672 #endif
 673
 674 /* General accessor macros for accessing the flags of an rtx.  */
 675
 676 /* Access an individual rtx flag, with no checking of any kind.  */
 677 #define RTX_FLAG(RTX, FLAG)     ((RTX)->FLAG)
 678
 679 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
 680 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__                    \
 681 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 682    if (GET_CODE (_rtx) != C1)                                           \
 683      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 684                              __FUNCTION__);                             \
 685    _rtx; })
 686
 687 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__                \
 688 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 689    if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2)                   \
 690      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 691                               __FUNCTION__);                            \
 692    _rtx; })
 693
 694 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__            \
 695 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 696    if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2                    \
 697        && GET_CODE (_rtx) != C3)                                        \
 698      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 699                              __FUNCTION__);                             \
 700    _rtx; })
 701
 702 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__        \
 703 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 704    if (GET_CODE (_rtx) != C1 && GET_CODE(_rtx) != C2                    \
 705        && GET_CODE (_rtx) != C3 && GET_CODE(_rtx) != C4)                \
 706      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 707                               __FUNCTION__);                            \
 708    _rtx; })
 709
 710 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__    \
 711 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 712    if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2                   \
 713        && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4                \
 714        && GET_CODE (_rtx) != C5)                                        \
 715      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 716                              __FUNCTION__);                             \
 717    _rtx; })
 718
 719 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              \
 720   __extension__                                                         \
 721 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 722    if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2                   \
 723        && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4                \
 724        && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6)               \
 725      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 726                              __FUNCTION__);                             \
 727    _rtx; })
 728
 729 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          \
 730   __extension__                                                         \
 731 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 732    if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2                   \
 733        && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4                \
 734        && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6                \
 735        && GET_CODE (_rtx) != C7)                                        \
 736      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 737                              __FUNCTION__);                             \
 738    _rtx; })
 739
 740 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      \
 741   __extension__                                                         \
 742 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 743    if (GET_CODE (_rtx) != C1 && GET_CODE (_rtx) != C2                   \
 744        && GET_CODE (_rtx) != C3 && GET_CODE (_rtx) != C4                \
 745        && GET_CODE (_rtx) != C5 && GET_CODE (_rtx) != C6                \
 746        && GET_CODE (_rtx) != C7 && GET_CODE (_rtx) != C8)               \
 747      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 748                              __FUNCTION__);                             \
 749    _rtx; })
 750
 751 extern void rtl_check_failed_flag (const char *, const_rtx, const char *,
 752                                    int, const char *)
 753     ATTRIBUTE_NORETURN
 754     ;
 755
 756 #else   /* not ENABLE_RTL_FLAG_CHECKING */
 757
 758 #define RTL_FLAG_CHECK1(NAME, RTX, C1)                                  (RTX)
 759 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2)                              (RTX)
 760 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3)                          (RTX)
 761 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4)                      (RTX)
 762 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5)          (RTX)
 763 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              (RTX)
 764 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          (RTX)
 765 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      (RTX)
 766 #endif
 767
 768 #define XINT(RTX, N)    (RTL_CHECK2 (RTX, N, 'i', 'n').rt_int)
 769 #define XUINT(RTX, N)   (RTL_CHECK2 (RTX, N, 'i', 'n').rt_uint)
 770 #define XSTR(RTX, N)    (RTL_CHECK2 (RTX, N, 's', 'S').rt_str)
 771 #define XEXP(RTX, N)    (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
 772 #define XVEC(RTX, N)    (RTL_CHECK2 (RTX, N, 'E', 'V').rt_rtvec)
 773 #define XMODE(RTX, N)   (RTL_CHECK1 (RTX, N, 'M').rt_type)
 774 #define XTREE(RTX, N)   (RTL_CHECK1 (RTX, N, 't').rt_tree)
 775 #define XBBDEF(RTX, N)  (RTL_CHECK1 (RTX, N, 'B').rt_bb)
 776 #define XTMPL(RTX, N)   (RTL_CHECK1 (RTX, N, 'T').rt_str)
 777 #define XCFI(RTX, N)    (RTL_CHECK1 (RTX, N, 'C').rt_cfi)
 778
 779 #define XVECEXP(RTX, N, M)      RTVEC_ELT (XVEC (RTX, N), M)
 780 #define XVECLEN(RTX, N)         GET_NUM_ELEM (XVEC (RTX, N))
 781
 782 /* These are like XINT, etc. except that they expect a '0' field instead
 783    of the normal type code.  */
 784
 785 #define X0INT(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_int)
 786 #define X0UINT(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_uint)
 787 #define X0STR(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_str)
 788 #define X0EXP(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtx)
 789 #define X0VEC(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtvec)
 790 #define X0MODE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_type)
 791 #define X0TREE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_tree)
 792 #define X0BBDEF(RTX, N)    (RTL_CHECK1 (RTX, N, '0').rt_bb)
 793 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
 794 #define X0CSELIB(RTX, N)   (RTL_CHECK1 (RTX, N, '0').rt_cselib)
 795 #define X0MEMATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, MEM).rt_mem)
 796 #define X0REGATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, REG).rt_reg)
 797 #define X0CONSTANT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_constant)
 798
 799 /* Access a '0' field with any type.  */
 800 #define X0ANY(RTX, N)      RTL_CHECK1 (RTX, N, '0')
 801
 802 #define XCINT(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_int)
 803 #define XCUINT(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_uint)
 804 #define XCSTR(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_str)
 805 #define XCEXP(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtx)
 806 #define XCVEC(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtvec)
 807 #define XCMODE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_type)
 808 #define XCTREE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_tree)
 809 #define XCBBDEF(RTX, N, C)    (RTL_CHECKC1 (RTX, N, C).rt_bb)
 810 #define XCCFI(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_cfi)
 811 #define XCCSELIB(RTX, N, C)   (RTL_CHECKC1 (RTX, N, C).rt_cselib)
 812
 813 #define XCVECEXP(RTX, N, M, C)  RTVEC_ELT (XCVEC (RTX, N, C), M)
 814 #define XCVECLEN(RTX, N, C)     GET_NUM_ELEM (XCVEC (RTX, N, C))
 815
 816 #define XC2EXP(RTX, N, C1, C2)      (RTL_CHECKC2 (RTX, N, C1, C2).rt_rtx)
 817 \f
 818 /* ACCESS MACROS for particular fields of insns.  */
 819
 820 /* Holds a unique number for each insn.
 821    These are not necessarily sequentially increasing.  */
 822 #define INSN_UID(INSN)  XINT (INSN, 0)
 823
 824 /* Chain insns together in sequence.  */
 825 #define PREV_INSN(INSN) XEXP (INSN, 1)
 826 #define NEXT_INSN(INSN) XEXP (INSN, 2)
 827
 828 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
 829
 830 /* The body of an insn.  */
 831 #define PATTERN(INSN)   XEXP (INSN, 4)
 832
 833 #define INSN_LOCATION(INSN) XUINT (INSN, 5)
 834
 835 #define INSN_HAS_LOCATION(INSN) ((LOCATION_LOCUS (INSN_LOCATION (INSN)))\
 836   != UNKNOWN_LOCATION)
 837
 838 /* LOCATION of an RTX if relevant.  */
 839 #define RTL_LOCATION(X) (INSN_P (X) ? \
 840                          INSN_LOCATION (X) : UNKNOWN_LOCATION)
 841
 842 /* Code number of instruction, from when it was recognized.
 843    -1 means this instruction has not been recognized yet.  */
 844 #define INSN_CODE(INSN) XINT (INSN, 6)
 845
 846 #define RTX_FRAME_RELATED_P(RTX)                                        \
 847   (RTL_FLAG_CHECK6 ("RTX_FRAME_RELATED_P", (RTX), DEBUG_INSN, INSN,     \
 848                     CALL_INSN, JUMP_INSN, BARRIER, SET)->frame_related)
 849
 850 /* 1 if RTX is an insn that has been deleted.  */
 851 #define INSN_DELETED_P(RTX)                                             \
 852   (RTL_FLAG_CHECK8 ("INSN_DELETED_P", (RTX), DEBUG_INSN, INSN,          \
 853                     CALL_INSN, JUMP_INSN, JUMP_TABLE_DATA,              \
 854                     CODE_LABEL, BARRIER, NOTE)->volatil)
 855
 856 /* 1 if RTX is a call to a const function.  Built from ECF_CONST and
 857    TREE_READONLY.  */
 858 #define RTL_CONST_CALL_P(RTX)                                   \
 859   (RTL_FLAG_CHECK1 ("RTL_CONST_CALL_P", (RTX), CALL_INSN)->unchanging)
 860
 861 /* 1 if RTX is a call to a pure function.  Built from ECF_PURE and
 862    DECL_PURE_P.  */
 863 #define RTL_PURE_CALL_P(RTX)                                    \
 864   (RTL_FLAG_CHECK1 ("RTL_PURE_CALL_P", (RTX), CALL_INSN)->return_val)
 865
 866 /* 1 if RTX is a call to a const or pure function.  */
 867 #define RTL_CONST_OR_PURE_CALL_P(RTX) \
 868   (RTL_CONST_CALL_P (RTX) || RTL_PURE_CALL_P (RTX))
 869
 870 /* 1 if RTX is a call to a looping const or pure function.  Built from
 871    ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P.  */
 872 #define RTL_LOOPING_CONST_OR_PURE_CALL_P(RTX)                           \
 873   (RTL_FLAG_CHECK1 ("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN)->call)
 874
 875 /* 1 if RTX is a call_insn for a sibling call.  */
 876 #define SIBLING_CALL_P(RTX)                                             \
 877   (RTL_FLAG_CHECK1 ("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
 878
 879 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch.  */
 880 #define INSN_ANNULLED_BRANCH_P(RTX)                                     \
 881   (RTL_FLAG_CHECK1 ("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN)->unchanging)
 882
 883 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
 884    If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
 885    executed if the branch is taken.  For annulled branches with this bit
 886    clear, the insn should be executed only if the branch is not taken.  */
 887 #define INSN_FROM_TARGET_P(RTX)                                         \
 888   (RTL_FLAG_CHECK3 ("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, \
 889                     CALL_INSN)->in_struct)
 890
 891 /* In an ADDR_DIFF_VEC, the flags for RTX for use by branch shortening.
 892    See the comments for ADDR_DIFF_VEC in rtl.def.  */
 893 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS (RTX, 4)
 894
 895 /* In a VALUE, the value cselib has assigned to RTX.
 896    This is a "struct cselib_val_struct", see cselib.h.  */
 897 #define CSELIB_VAL_PTR(RTX) X0CSELIB (RTX, 0)
 898
 899 /* Holds a list of notes on what this insn does to various REGs.
 900    It is a chain of EXPR_LIST rtx's, where the second operand is the
 901    chain pointer and the first operand is the REG being described.
 902    The mode field of the EXPR_LIST contains not a real machine mode
 903    but a value from enum reg_note.  */
 904 #define REG_NOTES(INSN) XEXP(INSN, 7)
 905
 906 /* In an ENTRY_VALUE this is the DECL_INCOMING_RTL of the argument in
 907    question.  */
 908 #define ENTRY_VALUE_EXP(RTX) (RTL_CHECKC1 (RTX, 0, ENTRY_VALUE).rt_rtx)
 909
 910 enum reg_note
 911 {
 912 #define DEF_REG_NOTE(NAME) NAME,
 913 #include "reg-notes.def"
 914 #undef DEF_REG_NOTE
 915   REG_NOTE_MAX
 916 };
 917
 918 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
 919 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
 920 #define PUT_REG_NOTE_KIND(LINK, KIND) \
 921   PUT_MODE (LINK, (enum machine_mode) (KIND))
 922
 923 /* Names for REG_NOTE's in EXPR_LIST insn's.  */
 924
 925 extern const char * const reg_note_name[];
 926 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
 927
 928 /* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
 929    USE and CLOBBER expressions.
 930      USE expressions list the registers filled with arguments that
 931    are passed to the function.
 932      CLOBBER expressions document the registers explicitly clobbered
 933    by this CALL_INSN.
 934      Pseudo registers can not be mentioned in this list.  */
 935 #define CALL_INSN_FUNCTION_USAGE(INSN)  XEXP(INSN, 8)
 936
 937 /* The label-number of a code-label.  The assembler label
 938    is made from `L' and the label-number printed in decimal.
 939    Label numbers are unique in a compilation.  */
 940 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
 941
 942 /* In a NOTE that is a line number, this is a string for the file name that the
 943    line is in.  We use the same field to record block numbers temporarily in
 944    NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.  (We avoid lots of casts
 945    between ints and pointers if we use a different macro for the block number.)
 946    */
 947
 948 /* Opaque data.  */
 949 #define NOTE_DATA(INSN)         RTL_CHECKC1 (INSN, 4, NOTE)
 950 #define NOTE_DELETED_LABEL_NAME(INSN) XCSTR (INSN, 4, NOTE)
 951 #define SET_INSN_DELETED(INSN) set_insn_deleted (INSN);
 952 #define NOTE_BLOCK(INSN)        XCTREE (INSN, 4, NOTE)
 953 #define NOTE_EH_HANDLER(INSN)   XCINT (INSN, 4, NOTE)
 954 #define NOTE_BASIC_BLOCK(INSN)  XCBBDEF (INSN, 4, NOTE)
 955 #define NOTE_VAR_LOCATION(INSN) XCEXP (INSN, 4, NOTE)
 956 #define NOTE_CFI(INSN)          XCCFI (INSN, 4, NOTE)
 957 #define NOTE_LABEL_NUMBER(INSN) XCINT (INSN, 4, NOTE)
 958
 959 /* In a NOTE that is a line number, this is the line number.
 960    Other kinds of NOTEs are identified by negative numbers here.  */
 961 #define NOTE_KIND(INSN) XCINT (INSN, 5, NOTE)
 962
 963 /* Nonzero if INSN is a note marking the beginning of a basic block.  */
 964 #define NOTE_INSN_BASIC_BLOCK_P(INSN) \
 965   (NOTE_P (INSN) && NOTE_KIND (INSN) == NOTE_INSN_BASIC_BLOCK)
 966
 967 /* Variable declaration and the location of a variable.  */
 968 #define PAT_VAR_LOCATION_DECL(PAT) (XCTREE ((PAT), 0, VAR_LOCATION))
 969 #define PAT_VAR_LOCATION_LOC(PAT) (XCEXP ((PAT), 1, VAR_LOCATION))
 970
 971 /* Initialization status of the variable in the location.  Status
 972    can be unknown, uninitialized or initialized.  See enumeration
 973    type below.  */
 974 #define PAT_VAR_LOCATION_STATUS(PAT) \
 975   ((enum var_init_status) (XCINT ((PAT), 2, VAR_LOCATION)))
 976
 977 /* Accessors for a NOTE_INSN_VAR_LOCATION.  */
 978 #define NOTE_VAR_LOCATION_DECL(NOTE) \
 979   PAT_VAR_LOCATION_DECL (NOTE_VAR_LOCATION (NOTE))
 980 #define NOTE_VAR_LOCATION_LOC(NOTE) \
 981   PAT_VAR_LOCATION_LOC (NOTE_VAR_LOCATION (NOTE))
 982 #define NOTE_VAR_LOCATION_STATUS(NOTE) \
 983   PAT_VAR_LOCATION_STATUS (NOTE_VAR_LOCATION (NOTE))
 984
 985 /* The VAR_LOCATION rtx in a DEBUG_INSN.  */
 986 #define INSN_VAR_LOCATION(INSN) PATTERN (INSN)
 987
 988 /* Accessors for a tree-expanded var location debug insn.  */
 989 #define INSN_VAR_LOCATION_DECL(INSN) \
 990   PAT_VAR_LOCATION_DECL (INSN_VAR_LOCATION (INSN))
 991 #define INSN_VAR_LOCATION_LOC(INSN) \
 992   PAT_VAR_LOCATION_LOC (INSN_VAR_LOCATION (INSN))
 993 #define INSN_VAR_LOCATION_STATUS(INSN) \
 994   PAT_VAR_LOCATION_STATUS (INSN_VAR_LOCATION (INSN))
 995
 996 /* Expand to the RTL that denotes an unknown variable location in a
 997    DEBUG_INSN.  */
 998 #define gen_rtx_UNKNOWN_VAR_LOC() (gen_rtx_CLOBBER (VOIDmode, const0_rtx))
 999
1000 /* Determine whether X is such an unknown location.  */
1001 #define VAR_LOC_UNKNOWN_P(X) \
1002   (GET_CODE (X) == CLOBBER && XEXP ((X), 0) == const0_rtx)
1003
1004 /* 1 if RTX is emitted after a call, but it should take effect before
1005    the call returns.  */
1006 #define NOTE_DURING_CALL_P(RTX)                         \
1007   (RTL_FLAG_CHECK1 ("NOTE_VAR_LOCATION_DURING_CALL_P", (RTX), NOTE)->call)
1008
1009 /* DEBUG_EXPR_DECL corresponding to a DEBUG_EXPR RTX.  */
1010 #define DEBUG_EXPR_TREE_DECL(RTX) XCTREE (RTX, 0, DEBUG_EXPR)
1011
1012 /* VAR_DECL/PARM_DECL DEBUG_IMPLICIT_PTR takes address of.  */
1013 #define DEBUG_IMPLICIT_PTR_DECL(RTX) XCTREE (RTX, 0, DEBUG_IMPLICIT_PTR)
1014
1015 /* PARM_DECL DEBUG_PARAMETER_REF references.  */
1016 #define DEBUG_PARAMETER_REF_DECL(RTX) XCTREE (RTX, 0, DEBUG_PARAMETER_REF)
1017
1018 /* Codes that appear in the NOTE_KIND field for kinds of notes
1019    that are not line numbers.  These codes are all negative.
1020
1021    Notice that we do not try to use zero here for any of
1022    the special note codes because sometimes the source line
1023    actually can be zero!  This happens (for example) when we
1024    are generating code for the per-translation-unit constructor
1025    and destructor routines for some C++ translation unit.  */
1026
1027 enum insn_note
1028 {
1029 #define DEF_INSN_NOTE(NAME) NAME,
1030 #include "insn-notes.def"
1031 #undef DEF_INSN_NOTE
1032
1033   NOTE_INSN_MAX
1034 };
1035
1036 /* Names for NOTE insn's other than line numbers.  */
1037
1038 extern const char * const note_insn_name[NOTE_INSN_MAX];
1039 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
1040   (note_insn_name[(NOTE_CODE)])
1041
1042 /* The name of a label, in case it corresponds to an explicit label
1043    in the input source code.  */
1044 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
1045
1046 /* In jump.c, each label contains a count of the number
1047    of LABEL_REFs that point at it, so unused labels can be deleted.  */
1048 #define LABEL_NUSES(RTX) XCINT (RTX, 5, CODE_LABEL)
1049
1050 /* Labels carry a two-bit field composed of the ->jump and ->call
1051    bits.  This field indicates whether the label is an alternate
1052    entry point, and if so, what kind.  */
1053 enum label_kind
1054 {
1055   LABEL_NORMAL = 0,     /* ordinary label */
1056   LABEL_STATIC_ENTRY,   /* alternate entry point, not exported */
1057   LABEL_GLOBAL_ENTRY,   /* alternate entry point, exported */
1058   LABEL_WEAK_ENTRY      /* alternate entry point, exported as weak symbol */
1059 };
1060
1061 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
1062
1063 /* Retrieve the kind of LABEL.  */
1064 #define LABEL_KIND(LABEL) __extension__                                 \
1065 ({ __typeof (LABEL) const _label = (LABEL);                             \
1066    if (! LABEL_P (_label))                                              \
1067      rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__,   \
1068                             __FUNCTION__);                              \
1069    (enum label_kind) ((_label->jump << 1) | _label->call); })
1070
1071 /* Set the kind of LABEL.  */
1072 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1073    __typeof (LABEL) const _label = (LABEL);                             \
1074    const unsigned int _kind = (KIND);                                   \
1075    if (! LABEL_P (_label))                                              \
1076      rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
1077                             __FUNCTION__);                              \
1078    _label->jump = ((_kind >> 1) & 1);                                   \
1079    _label->call = (_kind & 1);                                          \
1080 } while (0)
1081
1082 #else
1083
1084 /* Retrieve the kind of LABEL.  */
1085 #define LABEL_KIND(LABEL) \
1086    ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
1087
1088 /* Set the kind of LABEL.  */
1089 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1090    rtx const _label = (LABEL);                                          \
1091    const unsigned int _kind = (KIND);                                   \
1092    _label->jump = ((_kind >> 1) & 1);                                   \
1093    _label->call = (_kind & 1);                                          \
1094 } while (0)
1095
1096 #endif /* rtl flag checking */
1097
1098 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
1099
1100 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
1101    so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
1102    be decremented and possibly the label can be deleted.  */
1103 #define JUMP_LABEL(INSN)   XCEXP (INSN, 8, JUMP_INSN)
1104
1105 /* Once basic blocks are found, each CODE_LABEL starts a chain that
1106    goes through all the LABEL_REFs that jump to that label.  The chain
1107    eventually winds up at the CODE_LABEL: it is circular.  */
1108 #define LABEL_REFS(LABEL) XCEXP (LABEL, 4, CODE_LABEL)
1109 \f
1110 /* For a REG rtx, REGNO extracts the register number.  REGNO can only
1111    be used on RHS.  Use SET_REGNO to change the value.  */
1112 #define REGNO(RTX) (rhs_regno(RTX))
1113 #define SET_REGNO(RTX,N) \
1114   (df_ref_change_reg_with_loc (REGNO (RTX), N, RTX), XCUINT (RTX, 0, REG) = N)
1115 #define SET_REGNO_RAW(RTX,N) (XCUINT (RTX, 0, REG) = N)
1116
1117 /* ORIGINAL_REGNO holds the number the register originally had; for a
1118    pseudo register turned into a hard reg this will hold the old pseudo
1119    register number.  */
1120 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
1121
1122 /* Force the REGNO macro to only be used on the lhs.  */
1123 static inline unsigned int
1124 rhs_regno (const_rtx x)
1125 {
1126   return XCUINT (x, 0, REG);
1127 }
1128
1129
1130 /* 1 if RTX is a reg or parallel that is the current function's return
1131    value.  */
1132 #define REG_FUNCTION_VALUE_P(RTX)                                       \
1133   (RTL_FLAG_CHECK2 ("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->return_val)
1134
1135 /* 1 if RTX is a reg that corresponds to a variable declared by the user.  */
1136 #define REG_USERVAR_P(RTX)                                              \
1137   (RTL_FLAG_CHECK1 ("REG_USERVAR_P", (RTX), REG)->volatil)
1138
1139 /* 1 if RTX is a reg that holds a pointer value.  */
1140 #define REG_POINTER(RTX)                                                \
1141   (RTL_FLAG_CHECK1 ("REG_POINTER", (RTX), REG)->frame_related)
1142
1143 /* 1 if RTX is a mem that holds a pointer value.  */
1144 #define MEM_POINTER(RTX)                                                \
1145   (RTL_FLAG_CHECK1 ("MEM_POINTER", (RTX), MEM)->frame_related)
1146
1147 /* 1 if the given register REG corresponds to a hard register.  */
1148 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1149
1150 /* 1 if the given register number REG_NO corresponds to a hard register.  */
1151 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1152
1153 /* For a CONST_INT rtx, INTVAL extracts the integer.  */
1154 #define INTVAL(RTX) XCWINT (RTX, 0, CONST_INT)
1155 #define UINTVAL(RTX) ((unsigned HOST_WIDE_INT) INTVAL (RTX))
1156
1157 /* For a CONST_DOUBLE:
1158    For a VOIDmode, there are two integers CONST_DOUBLE_LOW is the
1159      low-order word and ..._HIGH the high-order.
1160    For a float, there is a REAL_VALUE_TYPE structure, and
1161      CONST_DOUBLE_REAL_VALUE(r) is a pointer to it.  */
1162 #define CONST_DOUBLE_LOW(r) XCMWINT (r, 0, CONST_DOUBLE, VOIDmode)
1163 #define CONST_DOUBLE_HIGH(r) XCMWINT (r, 1, CONST_DOUBLE, VOIDmode)
1164 #define CONST_DOUBLE_REAL_VALUE(r) \
1165   ((const struct real_value *) XCNMPRV (r, CONST_DOUBLE, VOIDmode))
1166
1167 #define CONST_FIXED_VALUE(r) \
1168   ((const struct fixed_value *) XCNMPFV (r, CONST_FIXED, VOIDmode))
1169 #define CONST_FIXED_VALUE_HIGH(r) \
1170   ((HOST_WIDE_INT) (CONST_FIXED_VALUE (r)->data.high))
1171 #define CONST_FIXED_VALUE_LOW(r) \
1172   ((HOST_WIDE_INT) (CONST_FIXED_VALUE (r)->data.low))
1173
1174 /* For a CONST_VECTOR, return element #n.  */
1175 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1176
1177 /* For a CONST_VECTOR, return the number of elements in a vector.  */
1178 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1179
1180 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1181    SUBREG_BYTE extracts the byte-number.  */
1182
1183 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1184 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1185
1186 /* in rtlanal.c */
1187 /* Return the right cost to give to an operation
1188    to make the cost of the corresponding register-to-register instruction
1189    N times that of a fast register-to-register instruction.  */
1190 #define COSTS_N_INSNS(N) ((N) * 4)
1191
1192 /* Maximum cost of an rtl expression.  This value has the special meaning
1193    not to use an rtx with this cost under any circumstances.  */
1194 #define MAX_COST INT_MAX
1195
1196 /* A structure to hold all available cost information about an rtl
1197    expression.  */
1198 struct full_rtx_costs
1199 {
1200   int speed;
1201   int size;
1202 };
1203
1204 /* Initialize a full_rtx_costs structure C to the maximum cost.  */
1205 static inline void
1206 init_costs_to_max (struct full_rtx_costs *c)
1207 {
1208   c->speed = MAX_COST;
1209   c->size = MAX_COST;
1210 }
1211
1212 /* Initialize a full_rtx_costs structure C to zero cost.  */
1213 static inline void
1214 init_costs_to_zero (struct full_rtx_costs *c)
1215 {
1216   c->speed = 0;
1217   c->size = 0;
1218 }
1219
1220 /* Compare two full_rtx_costs structures A and B, returning true
1221    if A < B when optimizing for speed.  */
1222 static inline bool
1223 costs_lt_p (struct full_rtx_costs *a, struct full_rtx_costs *b,
1224             bool speed)
1225 {
1226   if (speed)
1227     return (a->speed < b->speed
1228             || (a->speed == b->speed && a->size < b->size));
1229   else
1230     return (a->size < b->size
1231             || (a->size == b->size && a->speed < b->speed));
1232 }
1233
1234 /* Increase both members of the full_rtx_costs structure C by the
1235    cost of N insns.  */
1236 static inline void
1237 costs_add_n_insns (struct full_rtx_costs *c, int n)
1238 {
1239   c->speed += COSTS_N_INSNS (n);
1240   c->size += COSTS_N_INSNS (n);
1241 }
1242
1243 /* Information about an address.  This structure is supposed to be able
1244    to represent all supported target addresses.  Please extend it if it
1245    is not yet general enough.  */
1246 struct address_info {
1247   /* The mode of the value being addressed, or VOIDmode if this is
1248      a load-address operation with no known address mode.  */
1249   enum machine_mode mode;
1250
1251   /* The address space.  */
1252   addr_space_t as;
1253
1254   /* A pointer to the top-level address.  */
1255   rtx *outer;
1256
1257   /* A pointer to the inner address, after all address mutations
1258      have been stripped from the top-level address.  It can be one
1259      of the following:
1260
1261      - A {PRE,POST}_{INC,DEC} of *BASE.  SEGMENT, INDEX and DISP are null.
1262
1263      - A {PRE,POST}_MODIFY of *BASE.  In this case either INDEX or DISP
1264        points to the step value, depending on whether the step is variable
1265        or constant respectively.  SEGMENT is null.
1266
1267      - A plain sum of the form SEGMENT + BASE + INDEX + DISP,
1268        with null fields evaluating to 0.  */
1269   rtx *inner;
1270
1271   /* Components that make up *INNER.  Each one may be null or nonnull.
1272      When nonnull, their meanings are as follows:
1273
1274      - *SEGMENT is the "segment" of memory to which the address refers.
1275        This value is entirely target-specific and is only called a "segment"
1276        because that's its most typical use.  It contains exactly one UNSPEC,
1277        pointed to by SEGMENT_TERM.  The contents of *SEGMENT do not need
1278        reloading.
1279
1280      - *BASE is a variable expression representing a base address.
1281        It contains exactly one REG, SUBREG or MEM, pointed to by BASE_TERM.
1282
1283      - *INDEX is a variable expression representing an index value.
1284        It may be a scaled expression, such as a MULT.  It has exactly
1285        one REG, SUBREG or MEM, pointed to by INDEX_TERM.
1286
1287      - *DISP is a constant, possibly mutated.  DISP_TERM points to the
1288        unmutated RTX_CONST_OBJ.  */
1289   rtx *segment;
1290   rtx *base;
1291   rtx *index;
1292   rtx *disp;
1293
1294   rtx *segment_term;
1295   rtx *base_term;
1296   rtx *index_term;
1297   rtx *disp_term;
1298
1299   /* In a {PRE,POST}_MODIFY address, this points to a second copy
1300      of BASE_TERM, otherwise it is null.  */
1301   rtx *base_term2;
1302
1303   /* ADDRESS if this structure describes an address operand, MEM if
1304      it describes a MEM address.  */
1305   enum rtx_code addr_outer_code;
1306
1307   /* If BASE is nonnull, this is the code of the rtx that contains it.  */
1308   enum rtx_code base_outer_code;
1309
1310   /* True if this is an RTX_AUTOINC address.  */
1311   bool autoinc_p;
1312 };
1313
1314 extern void init_rtlanal (void);
1315 extern int rtx_cost (rtx, enum rtx_code, int, bool);
1316 extern int address_cost (rtx, enum machine_mode, addr_space_t, bool);
1317 extern void get_full_rtx_cost (rtx, enum rtx_code, int,
1318                                struct full_rtx_costs *);
1319 extern unsigned int subreg_lsb (const_rtx);
1320 extern unsigned int subreg_lsb_1 (enum machine_mode, enum machine_mode,
1321                                   unsigned int);
1322 extern unsigned int subreg_regno_offset (unsigned int, enum machine_mode,
1323                                          unsigned int, enum machine_mode);
1324 extern bool subreg_offset_representable_p (unsigned int, enum machine_mode,
1325                                            unsigned int, enum machine_mode);
1326 extern unsigned int subreg_regno (const_rtx);
1327 extern int simplify_subreg_regno (unsigned int, enum machine_mode,
1328                                   unsigned int, enum machine_mode);
1329 extern unsigned int subreg_nregs (const_rtx);
1330 extern unsigned int subreg_nregs_with_regno (unsigned int, const_rtx);
1331 extern unsigned HOST_WIDE_INT nonzero_bits (const_rtx, enum machine_mode);
1332 extern unsigned int num_sign_bit_copies (const_rtx, enum machine_mode);
1333 extern bool constant_pool_constant_p (rtx);
1334 extern bool truncated_to_mode (enum machine_mode, const_rtx);
1335 extern int low_bitmask_len (enum machine_mode, unsigned HOST_WIDE_INT);
1336 extern void split_double (rtx, rtx *, rtx *);
1337 extern rtx *strip_address_mutations (rtx *, enum rtx_code * = 0);
1338 extern void decompose_address (struct address_info *, rtx *,
1339                                enum machine_mode, addr_space_t, enum rtx_code);
1340 extern void decompose_lea_address (struct address_info *, rtx *);
1341 extern void decompose_mem_address (struct address_info *, rtx);
1342 extern void update_address (struct address_info *);
1343 extern HOST_WIDE_INT get_index_scale (const struct address_info *);
1344 extern enum rtx_code get_index_code (const struct address_info *);
1345
1346 #ifndef GENERATOR_FILE
1347 /* Return the cost of SET X.  SPEED_P is true if optimizing for speed
1348    rather than size.  */
1349
1350 static inline int
1351 set_rtx_cost (rtx x, bool speed_p)
1352 {
1353   return rtx_cost (x, INSN, 4, speed_p);
1354 }
1355
1356 /* Like set_rtx_cost, but return both the speed and size costs in C.  */
1357
1358 static inline void
1359 get_full_set_rtx_cost (rtx x, struct full_rtx_costs *c)
1360 {
1361   get_full_rtx_cost (x, INSN, 4, c);
1362 }
1363
1364 /* Return the cost of moving X into a register, relative to the cost
1365    of a register move.  SPEED_P is true if optimizing for speed rather
1366    than size.  */
1367
1368 static inline int
1369 set_src_cost (rtx x, bool speed_p)
1370 {
1371   return rtx_cost (x, SET, 1, speed_p);
1372 }
1373
1374 /* Like set_src_cost, but return both the speed and size costs in C.  */
1375
1376 static inline void
1377 get_full_set_src_cost (rtx x, struct full_rtx_costs *c)
1378 {
1379   get_full_rtx_cost (x, SET, 1, c);
1380 }
1381 #endif
1382
1383 /* 1 if RTX is a subreg containing a reg that is already known to be
1384    sign- or zero-extended from the mode of the subreg to the mode of
1385    the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1386    extension.
1387
1388    When used as a LHS, is means that this extension must be done
1389    when assigning to SUBREG_REG.  */
1390
1391 #define SUBREG_PROMOTED_VAR_P(RTX)                                      \
1392   (RTL_FLAG_CHECK1 ("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1393
1394 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL)                          \
1395 do {                                                                    \
1396   rtx const _rtx = RTL_FLAG_CHECK1 ("SUBREG_PROMOTED_UNSIGNED_SET",     \
1397                                     (RTX), SUBREG);                     \
1398   if ((VAL) < 0)                                                        \
1399     _rtx->volatil = 1;                                                  \
1400   else {                                                                \
1401     _rtx->volatil = 0;                                                  \
1402     _rtx->unchanging = (VAL);                                           \
1403   }                                                                     \
1404 } while (0)
1405
1406 /* Valid for subregs which are SUBREG_PROMOTED_VAR_P().  In that case
1407    this gives the necessary extensions:
1408    0  - signed
1409    1  - normal unsigned
1410    -1 - pointer unsigned, which most often can be handled like unsigned
1411         extension, except for generating instructions where we need to
1412         emit special code (ptr_extend insns) on some architectures.  */
1413
1414 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1415   ((RTL_FLAG_CHECK1 ("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1416    ? -1 : (int) (RTX)->unchanging)
1417
1418 /* True if the subreg was generated by LRA for reload insns.  Such
1419    subregs are valid only during LRA.  */
1420 #define LRA_SUBREG_P(RTX)       \
1421   (RTL_FLAG_CHECK1 ("LRA_SUBREG_P", (RTX), SUBREG)->jump)
1422
1423 /* Access various components of an ASM_OPERANDS rtx.  */
1424
1425 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1426 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1427 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1428 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1429 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1430 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1431 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1432 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1433   XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1434 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1435   XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1436 #define ASM_OPERANDS_INPUT_MODE(RTX, N)  \
1437   GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1438 #define ASM_OPERANDS_LABEL_VEC(RTX) XCVEC (RTX, 5, ASM_OPERANDS)
1439 #define ASM_OPERANDS_LABEL_LENGTH(RTX) XCVECLEN (RTX, 5, ASM_OPERANDS)
1440 #define ASM_OPERANDS_LABEL(RTX, N) XCVECEXP (RTX, 5, N, ASM_OPERANDS)
1441 #define ASM_OPERANDS_SOURCE_LOCATION(RTX) XCUINT (RTX, 6, ASM_OPERANDS)
1442 #define ASM_INPUT_SOURCE_LOCATION(RTX) XCUINT (RTX, 1, ASM_INPUT)
1443
1444 /* 1 if RTX is a mem that is statically allocated in read-only memory.  */
1445 #define MEM_READONLY_P(RTX) \
1446   (RTL_FLAG_CHECK1 ("MEM_READONLY_P", (RTX), MEM)->unchanging)
1447
1448 /* 1 if RTX is a mem and we should keep the alias set for this mem
1449    unchanged when we access a component.  Set to 1, or example, when we
1450    are already in a non-addressable component of an aggregate.  */
1451 #define MEM_KEEP_ALIAS_SET_P(RTX)                                       \
1452   (RTL_FLAG_CHECK1 ("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1453
1454 /* 1 if RTX is a mem or asm_operand for a volatile reference.  */
1455 #define MEM_VOLATILE_P(RTX)                                             \
1456   (RTL_FLAG_CHECK3 ("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS,         \
1457                     ASM_INPUT)->volatil)
1458
1459 /* 1 if RTX is a mem that cannot trap.  */
1460 #define MEM_NOTRAP_P(RTX) \
1461   (RTL_FLAG_CHECK1 ("MEM_NOTRAP_P", (RTX), MEM)->call)
1462
1463 /* The memory attribute block.  We provide access macros for each value
1464    in the block and provide defaults if none specified.  */
1465 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1466
1467 /* The register attribute block.  We provide access macros for each value
1468    in the block and provide defaults if none specified.  */
1469 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1470
1471 #ifndef GENERATOR_FILE
1472 /* For a MEM rtx, the alias set.  If 0, this MEM is not in any alias
1473    set, and may alias anything.  Otherwise, the MEM can only alias
1474    MEMs in a conflicting alias set.  This value is set in a
1475    language-dependent manner in the front-end, and should not be
1476    altered in the back-end.  These set numbers are tested with
1477    alias_sets_conflict_p.  */
1478 #define MEM_ALIAS_SET(RTX) (get_mem_attrs (RTX)->alias)
1479
1480 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1481    refer to part of a DECL.  It may also be a COMPONENT_REF.  */
1482 #define MEM_EXPR(RTX) (get_mem_attrs (RTX)->expr)
1483
1484 /* For a MEM rtx, true if its MEM_OFFSET is known.  */
1485 #define MEM_OFFSET_KNOWN_P(RTX) (get_mem_attrs (RTX)->offset_known_p)
1486
1487 /* For a MEM rtx, the offset from the start of MEM_EXPR.  */
1488 #define MEM_OFFSET(RTX) (get_mem_attrs (RTX)->offset)
1489
1490 /* For a MEM rtx, the address space.  */
1491 #define MEM_ADDR_SPACE(RTX) (get_mem_attrs (RTX)->addrspace)
1492
1493 /* For a MEM rtx, true if its MEM_SIZE is known.  */
1494 #define MEM_SIZE_KNOWN_P(RTX) (get_mem_attrs (RTX)->size_known_p)
1495
1496 /* For a MEM rtx, the size in bytes of the MEM.  */
1497 #define MEM_SIZE(RTX) (get_mem_attrs (RTX)->size)
1498
1499 /* For a MEM rtx, the alignment in bits.  We can use the alignment of the
1500    mode as a default when STRICT_ALIGNMENT, but not if not.  */
1501 #define MEM_ALIGN(RTX) (get_mem_attrs (RTX)->align)
1502 #else
1503 #define MEM_ADDR_SPACE(RTX) ADDR_SPACE_GENERIC
1504 #endif
1505
1506 /* For a REG rtx, the decl it is known to refer to, if it is known to
1507    refer to part of a DECL.  */
1508 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1509
1510 /* For a REG rtx, the offset from the start of REG_EXPR, if known, as an
1511    HOST_WIDE_INT.  */
1512 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1513
1514 /* Copy the attributes that apply to memory locations from RHS to LHS.  */
1515 #define MEM_COPY_ATTRIBUTES(LHS, RHS)                           \
1516   (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS),                 \
1517    MEM_NOTRAP_P (LHS) = MEM_NOTRAP_P (RHS),                     \
1518    MEM_READONLY_P (LHS) = MEM_READONLY_P (RHS),                 \
1519    MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS),     \
1520    MEM_POINTER (LHS) = MEM_POINTER (RHS),                       \
1521    MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1522
1523 /* 1 if RTX is a label_ref for a nonlocal label.  */
1524 /* Likewise in an expr_list for a REG_LABEL_OPERAND or
1525    REG_LABEL_TARGET note.  */
1526 #define LABEL_REF_NONLOCAL_P(RTX)                                       \
1527   (RTL_FLAG_CHECK1 ("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF)->volatil)
1528
1529 /* 1 if RTX is a code_label that should always be considered to be needed.  */
1530 #define LABEL_PRESERVE_P(RTX)                                           \
1531   (RTL_FLAG_CHECK2 ("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1532
1533 /* During sched, 1 if RTX is an insn that must be scheduled together
1534    with the preceding insn.  */
1535 #define SCHED_GROUP_P(RTX)                                              \
1536   (RTL_FLAG_CHECK4 ("SCHED_GROUP_P", (RTX), DEBUG_INSN, INSN,           \
1537                     JUMP_INSN, CALL_INSN)->in_struct)
1538
1539 /* For a SET rtx, SET_DEST is the place that is set
1540    and SET_SRC is the value it is set to.  */
1541 #define SET_DEST(RTX) XC2EXP (RTX, 0, SET, CLOBBER)
1542 #define SET_SRC(RTX) XCEXP (RTX, 1, SET)
1543 #define SET_IS_RETURN_P(RTX)                                            \
1544   (RTL_FLAG_CHECK1 ("SET_IS_RETURN_P", (RTX), SET)->jump)
1545
1546 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
1547 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1548 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1549
1550 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1551    conditionally executing the code on, COND_EXEC_CODE is the code
1552    to execute if the condition is true.  */
1553 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1554 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1555
1556 /* 1 if RTX is a symbol_ref that addresses this function's rtl
1557    constants pool.  */
1558 #define CONSTANT_POOL_ADDRESS_P(RTX)                                    \
1559   (RTL_FLAG_CHECK1 ("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1560
1561 /* 1 if RTX is a symbol_ref that addresses a value in the file's
1562    tree constant pool.  This information is private to varasm.c.  */
1563 #define TREE_CONSTANT_POOL_ADDRESS_P(RTX)                               \
1564   (RTL_FLAG_CHECK1 ("TREE_CONSTANT_POOL_ADDRESS_P",                     \
1565                     (RTX), SYMBOL_REF)->frame_related)
1566
1567 /* Used if RTX is a symbol_ref, for machine-specific purposes.  */
1568 #define SYMBOL_REF_FLAG(RTX)                                            \
1569   (RTL_FLAG_CHECK1 ("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1570
1571 /* 1 if RTX is a symbol_ref that has been the library function in
1572    emit_library_call.  */
1573 #define SYMBOL_REF_USED(RTX)                                            \
1574   (RTL_FLAG_CHECK1 ("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1575
1576 /* 1 if RTX is a symbol_ref for a weak symbol.  */
1577 #define SYMBOL_REF_WEAK(RTX)                                            \
1578   (RTL_FLAG_CHECK1 ("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->return_val)
1579
1580 /* A pointer attached to the SYMBOL_REF; either SYMBOL_REF_DECL or
1581    SYMBOL_REF_CONSTANT.  */
1582 #define SYMBOL_REF_DATA(RTX) X0ANY ((RTX), 2)
1583
1584 /* Set RTX's SYMBOL_REF_DECL to DECL.  RTX must not be a constant
1585    pool symbol.  */
1586 #define SET_SYMBOL_REF_DECL(RTX, DECL) \
1587   (gcc_assert (!CONSTANT_POOL_ADDRESS_P (RTX)), X0TREE ((RTX), 2) = (DECL))
1588
1589 /* The tree (decl or constant) associated with the symbol, or null.  */
1590 #define SYMBOL_REF_DECL(RTX) \
1591   (CONSTANT_POOL_ADDRESS_P (RTX) ? NULL : X0TREE ((RTX), 2))
1592
1593 /* Set RTX's SYMBOL_REF_CONSTANT to C.  RTX must be a constant pool symbol.  */
1594 #define SET_SYMBOL_REF_CONSTANT(RTX, C) \
1595   (gcc_assert (CONSTANT_POOL_ADDRESS_P (RTX)), X0CONSTANT ((RTX), 2) = (C))
1596
1597 /* The rtx constant pool entry for a symbol, or null.  */
1598 #define SYMBOL_REF_CONSTANT(RTX) \
1599   (CONSTANT_POOL_ADDRESS_P (RTX) ? X0CONSTANT ((RTX), 2) : NULL)
1600
1601 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1602    information derivable from the tree decl associated with this symbol.
1603    Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1604    decl.  In some cases this is a bug.  But beyond that, it's nice to cache
1605    this information to avoid recomputing it.  Finally, this allows space for
1606    the target to store more than one bit of information, as with
1607    SYMBOL_REF_FLAG.  */
1608 #define SYMBOL_REF_FLAGS(RTX)   X0INT ((RTX), 1)
1609
1610 /* These flags are common enough to be defined for all targets.  They
1611    are computed by the default version of targetm.encode_section_info.  */
1612
1613 /* Set if this symbol is a function.  */
1614 #define SYMBOL_FLAG_FUNCTION    (1 << 0)
1615 #define SYMBOL_REF_FUNCTION_P(RTX) \
1616   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1617 /* Set if targetm.binds_local_p is true.  */
1618 #define SYMBOL_FLAG_LOCAL       (1 << 1)
1619 #define SYMBOL_REF_LOCAL_P(RTX) \
1620   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1621 /* Set if targetm.in_small_data_p is true.  */
1622 #define SYMBOL_FLAG_SMALL       (1 << 2)
1623 #define SYMBOL_REF_SMALL_P(RTX) \
1624   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1625 /* The three-bit field at [5:3] is true for TLS variables; use
1626    SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model.  */
1627 #define SYMBOL_FLAG_TLS_SHIFT   3
1628 #define SYMBOL_REF_TLS_MODEL(RTX) \
1629   ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 7))
1630 /* Set if this symbol is not defined in this translation unit.  */
1631 #define SYMBOL_FLAG_EXTERNAL    (1 << 6)
1632 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1633   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1634 /* Set if this symbol has a block_symbol structure associated with it.  */
1635 #define SYMBOL_FLAG_HAS_BLOCK_INFO (1 << 7)
1636 #define SYMBOL_REF_HAS_BLOCK_INFO_P(RTX) \
1637   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_HAS_BLOCK_INFO) != 0)
1638 /* Set if this symbol is a section anchor.  SYMBOL_REF_ANCHOR_P implies
1639    SYMBOL_REF_HAS_BLOCK_INFO_P.  */
1640 #define SYMBOL_FLAG_ANCHOR      (1 << 8)
1641 #define SYMBOL_REF_ANCHOR_P(RTX) \
1642   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_ANCHOR) != 0)
1643
1644 /* Subsequent bits are available for the target to use.  */
1645 #define SYMBOL_FLAG_MACH_DEP_SHIFT      9
1646 #define SYMBOL_FLAG_MACH_DEP            (1 << SYMBOL_FLAG_MACH_DEP_SHIFT)
1647
1648 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the object_block
1649    structure to which the symbol belongs, or NULL if it has not been
1650    assigned a block.  */
1651 #define SYMBOL_REF_BLOCK(RTX) (BLOCK_SYMBOL_CHECK (RTX)->block)
1652
1653 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the offset of RTX from
1654    the first object in SYMBOL_REF_BLOCK (RTX).  The value is negative if
1655    RTX has not yet been assigned to a block, or it has not been given an
1656    offset within that block.  */
1657 #define SYMBOL_REF_BLOCK_OFFSET(RTX) (BLOCK_SYMBOL_CHECK (RTX)->offset)
1658
1659 /* True if RTX is flagged to be a scheduling barrier.  */
1660 #define PREFETCH_SCHEDULE_BARRIER_P(RTX)                                        \
1661   (RTL_FLAG_CHECK1 ("PREFETCH_SCHEDULE_BARRIER_P", (RTX), PREFETCH)->volatil)
1662
1663 /* Indicate whether the machine has any sort of auto increment addressing.
1664    If not, we can avoid checking for REG_INC notes.  */
1665
1666 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
1667      || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT) \
1668      || defined (HAVE_PRE_MODIFY_DISP) || defined (HAVE_POST_MODIFY_DISP) \
1669      || defined (HAVE_PRE_MODIFY_REG) || defined (HAVE_POST_MODIFY_REG))
1670 #define AUTO_INC_DEC
1671 #endif
1672
1673 /* Define a macro to look for REG_INC notes,
1674    but save time on machines where they never exist.  */
1675
1676 #ifdef AUTO_INC_DEC
1677 #define FIND_REG_INC_NOTE(INSN, REG)                    \
1678   ((REG) != NULL_RTX && REG_P ((REG))                   \
1679    ? find_regno_note ((INSN), REG_INC, REGNO (REG))     \
1680    : find_reg_note ((INSN), REG_INC, (REG)))
1681 #else
1682 #define FIND_REG_INC_NOTE(INSN, REG) 0
1683 #endif
1684
1685 #ifndef HAVE_PRE_INCREMENT
1686 #define HAVE_PRE_INCREMENT 0
1687 #endif
1688
1689 #ifndef HAVE_PRE_DECREMENT
1690 #define HAVE_PRE_DECREMENT 0
1691 #endif
1692
1693 #ifndef HAVE_POST_INCREMENT
1694 #define HAVE_POST_INCREMENT 0
1695 #endif
1696
1697 #ifndef HAVE_POST_DECREMENT
1698 #define HAVE_POST_DECREMENT 0
1699 #endif
1700
1701 #ifndef HAVE_POST_MODIFY_DISP
1702 #define HAVE_POST_MODIFY_DISP 0
1703 #endif
1704
1705 #ifndef HAVE_POST_MODIFY_REG
1706 #define HAVE_POST_MODIFY_REG 0
1707 #endif
1708
1709 #ifndef HAVE_PRE_MODIFY_DISP
1710 #define HAVE_PRE_MODIFY_DISP 0
1711 #endif
1712
1713 #ifndef HAVE_PRE_MODIFY_REG
1714 #define HAVE_PRE_MODIFY_REG 0
1715 #endif
1716
1717
1718 /* Some architectures do not have complete pre/post increment/decrement
1719    instruction sets, or only move some modes efficiently.  These macros
1720    allow us to tune autoincrement generation.  */
1721
1722 #ifndef USE_LOAD_POST_INCREMENT
1723 #define USE_LOAD_POST_INCREMENT(MODE)   HAVE_POST_INCREMENT
1724 #endif
1725
1726 #ifndef USE_LOAD_POST_DECREMENT
1727 #define USE_LOAD_POST_DECREMENT(MODE)   HAVE_POST_DECREMENT
1728 #endif
1729
1730 #ifndef USE_LOAD_PRE_INCREMENT
1731 #define USE_LOAD_PRE_INCREMENT(MODE)    HAVE_PRE_INCREMENT
1732 #endif
1733
1734 #ifndef USE_LOAD_PRE_DECREMENT
1735 #define USE_LOAD_PRE_DECREMENT(MODE)    HAVE_PRE_DECREMENT
1736 #endif
1737
1738 #ifndef USE_STORE_POST_INCREMENT
1739 #define USE_STORE_POST_INCREMENT(MODE)  HAVE_POST_INCREMENT
1740 #endif
1741
1742 #ifndef USE_STORE_POST_DECREMENT
1743 #define USE_STORE_POST_DECREMENT(MODE)  HAVE_POST_DECREMENT
1744 #endif
1745
1746 #ifndef USE_STORE_PRE_INCREMENT
1747 #define USE_STORE_PRE_INCREMENT(MODE)   HAVE_PRE_INCREMENT
1748 #endif
1749
1750 #ifndef USE_STORE_PRE_DECREMENT
1751 #define USE_STORE_PRE_DECREMENT(MODE)   HAVE_PRE_DECREMENT
1752 #endif
1753 \f
1754 /* Nonzero when we are generating CONCATs.  */
1755 extern int generating_concat_p;
1756
1757 /* Nonzero when we are expanding trees to RTL.  */
1758 extern int currently_expanding_to_rtl;
1759
1760 /* Generally useful functions.  */
1761
1762 /* In explow.c */
1763 extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
1764 extern rtx plus_constant (enum machine_mode, rtx, HOST_WIDE_INT);
1765
1766 /* In rtl.c */
1767 extern rtx rtx_alloc_stat (RTX_CODE MEM_STAT_DECL);
1768 #define rtx_alloc(c) rtx_alloc_stat (c MEM_STAT_INFO)
1769
1770 extern rtvec rtvec_alloc (int);
1771 extern rtvec shallow_copy_rtvec (rtvec);
1772 extern bool shared_const_p (const_rtx);
1773 extern rtx copy_rtx (rtx);
1774 extern void dump_rtx_statistics (void);
1775
1776 /* In emit-rtl.c */
1777 extern rtx copy_rtx_if_shared (rtx);
1778
1779 /* In rtl.c */
1780 extern unsigned int rtx_size (const_rtx);
1781 extern rtx shallow_copy_rtx_stat (const_rtx MEM_STAT_DECL);
1782 #define shallow_copy_rtx(a) shallow_copy_rtx_stat (a MEM_STAT_INFO)
1783 extern int rtx_equal_p (const_rtx, const_rtx);
1784 extern hashval_t iterative_hash_rtx (const_rtx, hashval_t);
1785
1786 /* In emit-rtl.c */
1787 extern rtvec gen_rtvec_v (int, rtx *);
1788 extern rtx gen_reg_rtx (enum machine_mode);
1789 extern rtx gen_rtx_REG_offset (rtx, enum machine_mode, unsigned int, int);
1790 extern rtx gen_reg_rtx_offset (rtx, enum machine_mode, int);
1791 extern rtx gen_reg_rtx_and_attrs (rtx);
1792 extern rtx gen_label_rtx (void);
1793 extern rtx gen_lowpart_common (enum machine_mode, rtx);
1794
1795 /* In cse.c */
1796 extern rtx gen_lowpart_if_possible (enum machine_mode, rtx);
1797
1798 /* In emit-rtl.c */
1799 extern rtx gen_highpart (enum machine_mode, rtx);
1800 extern rtx gen_highpart_mode (enum machine_mode, enum machine_mode, rtx);
1801 extern rtx operand_subword (rtx, unsigned int, int, enum machine_mode);
1802
1803 /* In emit-rtl.c */
1804 extern rtx operand_subword_force (rtx, unsigned int, enum machine_mode);
1805 extern bool paradoxical_subreg_p (const_rtx);
1806 extern int subreg_lowpart_p (const_rtx);
1807 extern unsigned int subreg_lowpart_offset (enum machine_mode,
1808                                            enum machine_mode);
1809 extern unsigned int subreg_highpart_offset (enum machine_mode,
1810                                             enum machine_mode);
1811 extern int byte_lowpart_offset (enum machine_mode, enum machine_mode);
1812 extern rtx make_safe_from (rtx, rtx);
1813 extern rtx convert_memory_address_addr_space (enum machine_mode, rtx,
1814                                               addr_space_t);
1815 #define convert_memory_address(to_mode,x) \
1816         convert_memory_address_addr_space ((to_mode), (x), ADDR_SPACE_GENERIC)
1817 extern const char *get_insn_name (int);
1818 extern rtx get_last_insn_anywhere (void);
1819 extern rtx get_first_nonnote_insn (void);
1820 extern rtx get_last_nonnote_insn (void);
1821 extern void start_sequence (void);
1822 extern void push_to_sequence (rtx);
1823 extern void push_to_sequence2 (rtx, rtx);
1824 extern void end_sequence (void);
1825 extern double_int rtx_to_double_int (const_rtx);
1826 extern rtx immed_double_int_const (double_int, enum machine_mode);
1827 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
1828                                enum machine_mode);
1829
1830 /* In loop-iv.c  */
1831
1832 extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
1833
1834 /* In varasm.c  */
1835 extern rtx force_const_mem (enum machine_mode, rtx);
1836
1837 /* In varasm.c  */
1838
1839 struct function;
1840 extern rtx get_pool_constant (rtx);
1841 extern rtx get_pool_constant_mark (rtx, bool *);
1842 extern enum machine_mode get_pool_mode (const_rtx);
1843 extern rtx simplify_subtraction (rtx);
1844 extern void decide_function_section (tree);
1845
1846 /* In function.c  */
1847 extern rtx assign_stack_local (enum machine_mode, HOST_WIDE_INT, int);
1848 #define ASLK_REDUCE_ALIGN 1
1849 #define ASLK_RECORD_PAD 2
1850 extern rtx assign_stack_local_1 (enum machine_mode, HOST_WIDE_INT, int, int);
1851 extern rtx assign_stack_temp (enum machine_mode, HOST_WIDE_INT);
1852 extern rtx assign_stack_temp_for_type (enum machine_mode, HOST_WIDE_INT, tree);
1853 extern rtx assign_temp (tree, int, int);
1854
1855 /* In emit-rtl.c */
1856 extern rtx emit_insn_before (rtx, rtx);
1857 extern rtx emit_insn_before_noloc (rtx, rtx, basic_block);
1858 extern rtx emit_insn_before_setloc (rtx, rtx, int);
1859 extern rtx emit_jump_insn_before (rtx, rtx);
1860 extern rtx emit_jump_insn_before_noloc (rtx, rtx);
1861 extern rtx emit_jump_insn_before_setloc (rtx, rtx, int);
1862 extern rtx emit_call_insn_before (rtx, rtx);
1863 extern rtx emit_call_insn_before_noloc (rtx, rtx);
1864 extern rtx emit_call_insn_before_setloc (rtx, rtx, int);
1865 extern rtx emit_debug_insn_before (rtx, rtx);
1866 extern rtx emit_debug_insn_before_noloc (rtx, rtx);
1867 extern rtx emit_debug_insn_before_setloc (rtx, rtx, int);
1868 extern rtx emit_barrier_before (rtx);
1869 extern rtx emit_label_before (rtx, rtx);
1870 extern rtx emit_note_before (enum insn_note, rtx);
1871 extern rtx emit_insn_after (rtx, rtx);
1872 extern rtx emit_insn_after_noloc (rtx, rtx, basic_block);
1873 extern rtx emit_insn_after_setloc (rtx, rtx, int);
1874 extern rtx emit_jump_insn_after (rtx, rtx);
1875 extern rtx emit_jump_insn_after_noloc (rtx, rtx);
1876 extern rtx emit_jump_insn_after_setloc (rtx, rtx, int);
1877 extern rtx emit_call_insn_after (rtx, rtx);
1878 extern rtx emit_call_insn_after_noloc (rtx, rtx);
1879 extern rtx emit_call_insn_after_setloc (rtx, rtx, int);
1880 extern rtx emit_debug_insn_after (rtx, rtx);
1881 extern rtx emit_debug_insn_after_noloc (rtx, rtx);
1882 extern rtx emit_debug_insn_after_setloc (rtx, rtx, int);
1883 extern rtx emit_barrier_after (rtx);
1884 extern rtx emit_label_after (rtx, rtx);
1885 extern rtx emit_note_after (enum insn_note, rtx);
1886 extern rtx emit_insn (rtx);
1887 extern rtx emit_debug_insn (rtx);
1888 extern rtx emit_jump_insn (rtx);
1889 extern rtx emit_call_insn (rtx);
1890 extern rtx emit_label (rtx);
1891 extern rtx emit_jump_table_data (rtx);
1892 extern rtx emit_barrier (void);
1893 extern rtx emit_note (enum insn_note);
1894 extern rtx emit_note_copy (rtx);
1895 extern rtx gen_clobber (rtx);
1896 extern rtx emit_clobber (rtx);
1897 extern rtx gen_use (rtx);
1898 extern rtx emit_use (rtx);
1899 extern rtx make_insn_raw (rtx);
1900 extern void add_function_usage_to (rtx, rtx);
1901 extern rtx last_call_insn (void);
1902 extern rtx previous_insn (rtx);
1903 extern rtx next_insn (rtx);
1904 extern rtx prev_nonnote_insn (rtx);
1905 extern rtx prev_nonnote_insn_bb (rtx);
1906 extern rtx next_nonnote_insn (rtx);
1907 extern rtx next_nonnote_insn_bb (rtx);
1908 extern rtx prev_nondebug_insn (rtx);
1909 extern rtx next_nondebug_insn (rtx);
1910 extern rtx prev_nonnote_nondebug_insn (rtx);
1911 extern rtx next_nonnote_nondebug_insn (rtx);
1912 extern rtx prev_real_insn (rtx);
1913 extern rtx next_real_insn (rtx);
1914 extern rtx prev_active_insn (rtx);
1915 extern rtx next_active_insn (rtx);
1916 extern int active_insn_p (const_rtx);
1917 extern rtx next_cc0_user (rtx);
1918 extern rtx prev_cc0_setter (rtx);
1919
1920 /* In emit-rtl.c  */
1921 extern int insn_line (const_rtx);
1922 extern const char * insn_file (const_rtx);
1923 extern tree insn_scope (const_rtx);
1924 extern location_t prologue_location, epilogue_location;
1925
1926 /* In jump.c */
1927 extern enum rtx_code reverse_condition (enum rtx_code);
1928 extern enum rtx_code reverse_condition_maybe_unordered (enum rtx_code);
1929 extern enum rtx_code swap_condition (enum rtx_code);
1930 extern enum rtx_code unsigned_condition (enum rtx_code);
1931 extern enum rtx_code signed_condition (enum rtx_code);
1932 extern void mark_jump_label (rtx, rtx, int);
1933
1934 /* In jump.c */
1935 extern rtx delete_related_insns (rtx);
1936
1937 /* In recog.c  */
1938 extern rtx *find_constant_term_loc (rtx *);
1939
1940 /* In emit-rtl.c  */
1941 extern rtx try_split (rtx, rtx, int);
1942 extern int split_branch_probability;
1943
1944 /* In unknown file  */
1945 extern rtx split_insns (rtx, rtx);
1946
1947 /* In simplify-rtx.c  */
1948 extern rtx simplify_const_unary_operation (enum rtx_code, enum machine_mode,
1949                                            rtx, enum machine_mode);
1950 extern rtx simplify_unary_operation (enum rtx_code, enum machine_mode, rtx,
1951                                      enum machine_mode);
1952 extern rtx simplify_const_binary_operation (enum rtx_code, enum machine_mode,
1953                                             rtx, rtx);
1954 extern rtx simplify_binary_operation (enum rtx_code, enum machine_mode, rtx,
1955                                       rtx);
1956 extern rtx simplify_ternary_operation (enum rtx_code, enum machine_mode,
1957                                        enum machine_mode, rtx, rtx, rtx);
1958 extern rtx simplify_const_relational_operation (enum rtx_code,
1959                                                 enum machine_mode, rtx, rtx);
1960 extern rtx simplify_relational_operation (enum rtx_code, enum machine_mode,
1961                                           enum machine_mode, rtx, rtx);
1962 extern rtx simplify_gen_binary (enum rtx_code, enum machine_mode, rtx, rtx);
1963 extern rtx simplify_gen_unary (enum rtx_code, enum machine_mode, rtx,
1964                                enum machine_mode);
1965 extern rtx simplify_gen_ternary (enum rtx_code, enum machine_mode,
1966                                  enum machine_mode, rtx, rtx, rtx);
1967 extern rtx simplify_gen_relational (enum rtx_code, enum machine_mode,
1968                                     enum machine_mode, rtx, rtx);
1969 extern rtx simplify_subreg (enum machine_mode, rtx, enum machine_mode,
1970                             unsigned int);
1971 extern rtx simplify_gen_subreg (enum machine_mode, rtx, enum machine_mode,
1972                                 unsigned int);
1973 extern rtx simplify_replace_fn_rtx (rtx, const_rtx,
1974                                     rtx (*fn) (rtx, const_rtx, void *), void *);
1975 extern rtx simplify_replace_rtx (rtx, const_rtx, rtx);
1976 extern rtx simplify_rtx (const_rtx);
1977 extern rtx avoid_constant_pool_reference (rtx);
1978 extern rtx delegitimize_mem_from_attrs (rtx);
1979 extern bool mode_signbit_p (enum machine_mode, const_rtx);
1980 extern bool val_signbit_p (enum machine_mode, unsigned HOST_WIDE_INT);
1981 extern bool val_signbit_known_set_p (enum machine_mode,
1982                                      unsigned HOST_WIDE_INT);
1983 extern bool val_signbit_known_clear_p (enum machine_mode,
1984                                        unsigned HOST_WIDE_INT);
1985
1986 /* In reginfo.c  */
1987 extern enum machine_mode choose_hard_reg_mode (unsigned int, unsigned int,
1988                                                bool);
1989
1990 /* In emit-rtl.c  */
1991 extern rtx set_unique_reg_note (rtx, enum reg_note, rtx);
1992 extern rtx set_dst_reg_note (rtx, enum reg_note, rtx, rtx);
1993 extern void set_insn_deleted (rtx);
1994
1995 /* Functions in rtlanal.c */
1996
1997 /* Single set is implemented as macro for performance reasons.  */
1998 #define single_set(I) (INSN_P (I) \
1999                        ? (GET_CODE (PATTERN (I)) == SET \
2000                           ? PATTERN (I) : single_set_1 (I)) \
2001                        : NULL_RTX)
2002 #define single_set_1(I) single_set_2 (I, PATTERN (I))
2003
2004 /* Structure used for passing data to REPLACE_LABEL.  */
2005 typedef struct replace_label_data
2006 {
2007   rtx r1;
2008   rtx r2;
2009   bool update_label_nuses;
2010 } replace_label_data;
2011
2012 extern enum machine_mode get_address_mode (rtx mem);
2013 extern int rtx_addr_can_trap_p (const_rtx);
2014 extern bool nonzero_address_p (const_rtx);
2015 extern int rtx_unstable_p (const_rtx);
2016 extern bool rtx_varies_p (const_rtx, bool);
2017 extern bool rtx_addr_varies_p (const_rtx, bool);
2018 extern rtx get_call_rtx_from (rtx);
2019 extern HOST_WIDE_INT get_integer_term (const_rtx);
2020 extern rtx get_related_value (const_rtx);
2021 extern bool offset_within_block_p (const_rtx, HOST_WIDE_INT);
2022 extern void split_const (rtx, rtx *, rtx *);
2023 extern bool unsigned_reg_p (rtx);
2024 extern int reg_mentioned_p (const_rtx, const_rtx);
2025 extern int count_occurrences (const_rtx, const_rtx, int);
2026 extern int reg_referenced_p (const_rtx, const_rtx);
2027 extern int reg_used_between_p (const_rtx, const_rtx, const_rtx);
2028 extern int reg_set_between_p (const_rtx, const_rtx, const_rtx);
2029 extern int commutative_operand_precedence (rtx);
2030 extern bool swap_commutative_operands_p (rtx, rtx);
2031 extern int modified_between_p (const_rtx, const_rtx, const_rtx);
2032 extern int no_labels_between_p (const_rtx, const_rtx);
2033 extern int modified_in_p (const_rtx, const_rtx);
2034 extern int reg_set_p (const_rtx, const_rtx);
2035 extern rtx single_set_2 (const_rtx, const_rtx);
2036 extern int multiple_sets (const_rtx);
2037 extern int set_noop_p (const_rtx);
2038 extern int noop_move_p (const_rtx);
2039 extern rtx find_last_value (rtx, rtx *, rtx, int);
2040 extern int refers_to_regno_p (unsigned int, unsigned int, const_rtx, rtx *);
2041 extern int reg_overlap_mentioned_p (const_rtx, const_rtx);
2042 extern const_rtx set_of (const_rtx, const_rtx);
2043 extern void record_hard_reg_sets (rtx, const_rtx, void *);
2044 extern void record_hard_reg_uses (rtx *, void *);
2045 #ifdef HARD_CONST
2046 extern void find_all_hard_reg_sets (const_rtx, HARD_REG_SET *);
2047 #endif
2048 extern void note_stores (const_rtx, void (*) (rtx, const_rtx, void *), void *);
2049 extern void note_uses (rtx *, void (*) (rtx *, void *), void *);
2050 extern int dead_or_set_p (const_rtx, const_rtx);
2051 extern int dead_or_set_regno_p (const_rtx, unsigned int);
2052 extern rtx find_reg_note (const_rtx, enum reg_note, const_rtx);
2053 extern rtx find_regno_note (const_rtx, enum reg_note, unsigned int);
2054 extern rtx find_reg_equal_equiv_note (const_rtx);
2055 extern rtx find_constant_src (const_rtx);
2056 extern int find_reg_fusage (const_rtx, enum rtx_code, const_rtx);
2057 extern int find_regno_fusage (const_rtx, enum rtx_code, unsigned int);
2058 extern rtx alloc_reg_note (enum reg_note, rtx, rtx);
2059 extern void add_reg_note (rtx, enum reg_note, rtx);
2060 extern void add_int_reg_note (rtx, enum reg_note, int);
2061 extern void add_shallow_copy_of_reg_note (rtx, rtx);
2062 extern void remove_note (rtx, const_rtx);
2063 extern void remove_reg_equal_equiv_notes (rtx);
2064 extern void remove_reg_equal_equiv_notes_for_regno (unsigned int);
2065 extern int side_effects_p (const_rtx);
2066 extern int volatile_refs_p (const_rtx);
2067 extern int volatile_insn_p (const_rtx);
2068 extern int may_trap_p_1 (const_rtx, unsigned);
2069 extern int may_trap_p (const_rtx);
2070 extern int may_trap_or_fault_p (const_rtx);
2071 extern bool can_throw_internal (const_rtx);
2072 extern bool can_throw_external (const_rtx);
2073 extern bool insn_could_throw_p (const_rtx);
2074 extern bool insn_nothrow_p (const_rtx);
2075 extern bool can_nonlocal_goto (const_rtx);
2076 extern void copy_reg_eh_region_note_forward (rtx, rtx, rtx);
2077 extern void copy_reg_eh_region_note_backward (rtx, rtx, rtx);
2078 extern int inequality_comparisons_p (const_rtx);
2079 extern rtx replace_rtx (rtx, rtx, rtx);
2080 extern int replace_label (rtx *, void *);
2081 extern int rtx_referenced_p (rtx, rtx);
2082 extern bool tablejump_p (const_rtx, rtx *, rtx *);
2083 extern int computed_jump_p (const_rtx);
2084
2085 typedef int (*rtx_function) (rtx *, void *);
2086 extern int for_each_rtx (rtx *, rtx_function, void *);
2087
2088 /* Callback for for_each_inc_dec, to process the autoinc operation OP
2089    within MEM that sets DEST to SRC + SRCOFF, or SRC if SRCOFF is
2090    NULL.  The callback is passed the same opaque ARG passed to
2091    for_each_inc_dec.  Return zero to continue looking for other
2092    autoinc operations, -1 to skip OP's operands, and any other value
2093    to interrupt the traversal and return that value to the caller of
2094    for_each_inc_dec.  */
2095 typedef int (*for_each_inc_dec_fn) (rtx mem, rtx op, rtx dest, rtx src,
2096                                     rtx srcoff, void *arg);
2097 extern int for_each_inc_dec (rtx *, for_each_inc_dec_fn, void *arg);
2098
2099 typedef int (*rtx_equal_p_callback_function) (const_rtx *, const_rtx *,
2100                                               rtx *, rtx *);
2101 extern int rtx_equal_p_cb (const_rtx, const_rtx,
2102                            rtx_equal_p_callback_function);
2103
2104 typedef int (*hash_rtx_callback_function) (const_rtx, enum machine_mode, rtx *,
2105                                            enum machine_mode *);
2106 extern unsigned hash_rtx_cb (const_rtx, enum machine_mode, int *, int *,
2107                              bool, hash_rtx_callback_function);
2108
2109 extern rtx regno_use_in (unsigned int, rtx);
2110 extern int auto_inc_p (const_rtx);
2111 extern int in_expr_list_p (const_rtx, const_rtx);
2112 extern void remove_node_from_expr_list (const_rtx, rtx *);
2113 extern int loc_mentioned_in_p (rtx *, const_rtx);
2114 extern rtx find_first_parameter_load (rtx, rtx);
2115 extern bool keep_with_call_p (const_rtx);
2116 extern bool label_is_jump_target_p (const_rtx, const_rtx);
2117 extern int insn_rtx_cost (rtx, bool);
2118
2119 /* Given an insn and condition, return a canonical description of
2120    the test being made.  */
2121 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
2122
2123 /* Given a JUMP_INSN, return a canonical description of the test
2124    being made.  */
2125 extern rtx get_condition (rtx, rtx *, int, int);
2126
2127 /* Information about a subreg of a hard register.  */
2128 struct subreg_info
2129 {
2130   /* Offset of first hard register involved in the subreg.  */
2131   int offset;
2132   /* Number of hard registers involved in the subreg.  */
2133   int nregs;
2134   /* Whether this subreg can be represented as a hard reg with the new
2135      mode.  */
2136   bool representable_p;
2137 };
2138
2139 extern void subreg_get_info (unsigned int, enum machine_mode,
2140                              unsigned int, enum machine_mode,
2141                              struct subreg_info *);
2142
2143 /* lists.c */
2144
2145 extern void free_EXPR_LIST_list (rtx *);
2146 extern void free_INSN_LIST_list (rtx *);
2147 extern void free_EXPR_LIST_node (rtx);
2148 extern void free_INSN_LIST_node (rtx);
2149 extern rtx alloc_INSN_LIST (rtx, rtx);
2150 extern rtx copy_INSN_LIST (rtx);
2151 extern rtx concat_INSN_LIST (rtx, rtx);
2152 extern rtx alloc_EXPR_LIST (int, rtx, rtx);
2153 extern void remove_free_INSN_LIST_elem (rtx, rtx *);
2154 extern rtx remove_list_elem (rtx, rtx *);
2155 extern rtx remove_free_INSN_LIST_node (rtx *);
2156 extern rtx remove_free_EXPR_LIST_node (rtx *);
2157
2158
2159 /* reginfo.c */
2160
2161 /* Resize reg info.  */
2162 extern bool resize_reg_info (void);
2163 /* Free up register info memory.  */
2164 extern void free_reg_info (void);
2165 extern void init_subregs_of_mode (void);
2166 extern void finish_subregs_of_mode (void);
2167
2168 /* recog.c */
2169 extern rtx extract_asm_operands (rtx);
2170 extern int asm_noperands (const_rtx);
2171 extern const char *decode_asm_operands (rtx, rtx *, rtx **, const char **,
2172                                         enum machine_mode *, location_t *);
2173
2174 extern enum reg_class reg_preferred_class (int);
2175 extern enum reg_class reg_alternate_class (int);
2176 extern enum reg_class reg_allocno_class (int);
2177 extern void setup_reg_classes (int, enum reg_class, enum reg_class,
2178                                enum reg_class);
2179
2180 extern void split_all_insns (void);
2181 extern unsigned int split_all_insns_noflow (void);
2182
2183 #define MAX_SAVED_CONST_INT 64
2184 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
2185
2186 #define const0_rtx      (const_int_rtx[MAX_SAVED_CONST_INT])
2187 #define const1_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+1])
2188 #define const2_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+2])
2189 #define constm1_rtx     (const_int_rtx[MAX_SAVED_CONST_INT-1])
2190 extern GTY(()) rtx const_true_rtx;
2191
2192 extern GTY(()) rtx const_tiny_rtx[4][(int) MAX_MACHINE_MODE];
2193
2194 /* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
2195    same as VOIDmode.  */
2196
2197 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
2198
2199 /* Likewise, for the constants 1 and 2 and -1.  */
2200
2201 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
2202 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
2203 #define CONSTM1_RTX(MODE) (const_tiny_rtx[3][(int) (MODE)])
2204
2205 extern GTY(()) rtx pc_rtx;
2206 extern GTY(()) rtx cc0_rtx;
2207 extern GTY(()) rtx ret_rtx;
2208 extern GTY(()) rtx simple_return_rtx;
2209
2210 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
2211    is used to represent the frame pointer.  This is because the
2212    hard frame pointer and the automatic variables are separated by an amount
2213    that cannot be determined until after register allocation.  We can assume
2214    that in this case ELIMINABLE_REGS will be defined, one action of which
2215    will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM.  */
2216 #ifndef HARD_FRAME_POINTER_REGNUM
2217 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
2218 #endif
2219
2220 #ifndef HARD_FRAME_POINTER_IS_FRAME_POINTER
2221 #define HARD_FRAME_POINTER_IS_FRAME_POINTER \
2222   (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM)
2223 #endif
2224
2225 #ifndef HARD_FRAME_POINTER_IS_ARG_POINTER
2226 #define HARD_FRAME_POINTER_IS_ARG_POINTER \
2227   (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
2228 #endif
2229
2230 /* Index labels for global_rtl.  */
2231 enum global_rtl_index
2232 {
2233   GR_STACK_POINTER,
2234   GR_FRAME_POINTER,
2235 /* For register elimination to work properly these hard_frame_pointer_rtx,
2236    frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
2237    the same register.  */
2238 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
2239   GR_ARG_POINTER = GR_FRAME_POINTER,
2240 #endif
2241 #if HARD_FRAME_POINTER_IS_FRAME_POINTER
2242   GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
2243 #else
2244   GR_HARD_FRAME_POINTER,
2245 #endif
2246 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
2247 #if HARD_FRAME_POINTER_IS_ARG_POINTER
2248   GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
2249 #else
2250   GR_ARG_POINTER,
2251 #endif
2252 #endif
2253   GR_VIRTUAL_INCOMING_ARGS,
2254   GR_VIRTUAL_STACK_ARGS,
2255   GR_VIRTUAL_STACK_DYNAMIC,
2256   GR_VIRTUAL_OUTGOING_ARGS,
2257   GR_VIRTUAL_CFA,
2258   GR_VIRTUAL_PREFERRED_STACK_BOUNDARY,
2259
2260   GR_MAX
2261 };
2262
2263 /* Target-dependent globals.  */
2264 struct GTY(()) target_rtl {
2265   /* All references to the hard registers in global_rtl_index go through
2266      these unique rtl objects.  On machines where the frame-pointer and
2267      arg-pointer are the same register, they use the same unique object.
2268
2269      After register allocation, other rtl objects which used to be pseudo-regs
2270      may be clobbered to refer to the frame-pointer register.
2271      But references that were originally to the frame-pointer can be
2272      distinguished from the others because they contain frame_pointer_rtx.
2273
2274      When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
2275      tricky: until register elimination has taken place hard_frame_pointer_rtx
2276      should be used if it is being set, and frame_pointer_rtx otherwise.  After
2277      register elimination hard_frame_pointer_rtx should always be used.
2278      On machines where the two registers are same (most) then these are the
2279      same.  */
2280   rtx x_global_rtl[GR_MAX];
2281
2282   /* A unique representation of (REG:Pmode PIC_OFFSET_TABLE_REGNUM).  */
2283   rtx x_pic_offset_table_rtx;
2284
2285   /* A unique representation of (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM).
2286      This is used to implement __builtin_return_address for some machines;
2287      see for instance the MIPS port.  */
2288   rtx x_return_address_pointer_rtx;
2289
2290   /* Commonly used RTL for hard registers.  These objects are not
2291      necessarily unique, so we allocate them separately from global_rtl.
2292      They are initialized once per compilation unit, then copied into
2293      regno_reg_rtx at the beginning of each function.  */
2294   rtx x_initial_regno_reg_rtx[FIRST_PSEUDO_REGISTER];
2295
2296   /* A sample (mem:M stack_pointer_rtx) rtx for each mode M.  */
2297   rtx x_top_of_stack[MAX_MACHINE_MODE];
2298
2299   /* Static hunks of RTL used by the aliasing code; these are treated
2300      as persistent to avoid unnecessary RTL allocations.  */
2301   rtx x_static_reg_base_value[FIRST_PSEUDO_REGISTER];
2302
2303   /* The default memory attributes for each mode.  */
2304   struct mem_attrs *x_mode_mem_attrs[(int) MAX_MACHINE_MODE];
2305 };
2306
2307 extern GTY(()) struct target_rtl default_target_rtl;
2308 #if SWITCHABLE_TARGET
2309 extern struct target_rtl *this_target_rtl;
2310 #else
2311 #define this_target_rtl (&default_target_rtl)
2312 #endif
2313
2314 #define global_rtl                              \
2315   (this_target_rtl->x_global_rtl)
2316 #define pic_offset_table_rtx \
2317   (this_target_rtl->x_pic_offset_table_rtx)
2318 #define return_address_pointer_rtx \
2319   (this_target_rtl->x_return_address_pointer_rtx)
2320 #define top_of_stack \
2321   (this_target_rtl->x_top_of_stack)
2322 #define mode_mem_attrs \
2323   (this_target_rtl->x_mode_mem_attrs)
2324
2325 /* All references to certain hard regs, except those created
2326    by allocating pseudo regs into them (when that's possible),
2327    go through these unique rtx objects.  */
2328 #define stack_pointer_rtx       (global_rtl[GR_STACK_POINTER])
2329 #define frame_pointer_rtx       (global_rtl[GR_FRAME_POINTER])
2330 #define hard_frame_pointer_rtx  (global_rtl[GR_HARD_FRAME_POINTER])
2331 #define arg_pointer_rtx         (global_rtl[GR_ARG_POINTER])
2332
2333 #ifndef GENERATOR_FILE
2334 /* Return the attributes of a MEM rtx.  */
2335 static inline struct mem_attrs *
2336 get_mem_attrs (const_rtx x)
2337 {
2338   struct mem_attrs *attrs;
2339
2340   attrs = MEM_ATTRS (x);
2341   if (!attrs)
2342     attrs = mode_mem_attrs[(int) GET_MODE (x)];
2343   return attrs;
2344 }
2345 #endif
2346
2347 /* Include the RTL generation functions.  */
2348
2349 #ifndef GENERATOR_FILE
2350 #include "genrtl.h"
2351 #undef gen_rtx_ASM_INPUT
2352 #define gen_rtx_ASM_INPUT(MODE, ARG0)                           \
2353   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), 0)
2354 #define gen_rtx_ASM_INPUT_loc(MODE, ARG0, LOC)                  \
2355   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), (LOC))
2356 #endif
2357
2358 /* There are some RTL codes that require special attention; the
2359    generation functions included above do the raw handling.  If you
2360    add to this list, modify special_rtx in gengenrtl.c as well.  */
2361
2362 extern rtx gen_rtx_CONST_INT (enum machine_mode, HOST_WIDE_INT);
2363 extern rtx gen_rtx_CONST_VECTOR (enum machine_mode, rtvec);
2364 extern rtx gen_raw_REG (enum machine_mode, int);
2365 extern rtx gen_rtx_REG (enum machine_mode, unsigned);
2366 extern rtx gen_rtx_SUBREG (enum machine_mode, rtx, int);
2367 extern rtx gen_rtx_MEM (enum machine_mode, rtx);
2368
2369 #define GEN_INT(N)  gen_rtx_CONST_INT (VOIDmode, (N))
2370
2371 /* Virtual registers are used during RTL generation to refer to locations into
2372    the stack frame when the actual location isn't known until RTL generation
2373    is complete.  The routine instantiate_virtual_regs replaces these with
2374    the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
2375    a constant.  */
2376
2377 #define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
2378
2379 /* This points to the first word of the incoming arguments passed on the stack,
2380    either by the caller or by the callee when pretending it was passed by the
2381    caller.  */
2382
2383 #define virtual_incoming_args_rtx       (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
2384
2385 #define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
2386
2387 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
2388    variable on the stack.  Otherwise, it points to the first variable on
2389    the stack.  */
2390
2391 #define virtual_stack_vars_rtx          (global_rtl[GR_VIRTUAL_STACK_ARGS])
2392
2393 #define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
2394
2395 /* This points to the location of dynamically-allocated memory on the stack
2396    immediately after the stack pointer has been adjusted by the amount
2397    desired.  */
2398
2399 #define virtual_stack_dynamic_rtx       (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
2400
2401 #define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
2402
2403 /* This points to the location in the stack at which outgoing arguments should
2404    be written when the stack is pre-pushed (arguments pushed using push
2405    insns always use sp).  */
2406
2407 #define virtual_outgoing_args_rtx       (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
2408
2409 #define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
2410
2411 /* This points to the Canonical Frame Address of the function.  This
2412    should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
2413    but is calculated relative to the arg pointer for simplicity; the
2414    frame pointer nor stack pointer are necessarily fixed relative to
2415    the CFA until after reload.  */
2416
2417 #define virtual_cfa_rtx                 (global_rtl[GR_VIRTUAL_CFA])
2418
2419 #define VIRTUAL_CFA_REGNUM              ((FIRST_VIRTUAL_REGISTER) + 4)
2420
2421 #define LAST_VIRTUAL_POINTER_REGISTER   ((FIRST_VIRTUAL_REGISTER) + 4)
2422
2423 /* This is replaced by crtl->preferred_stack_boundary / BITS_PER_UNIT
2424    when finalized.  */
2425
2426 #define virtual_preferred_stack_boundary_rtx \
2427         (global_rtl[GR_VIRTUAL_PREFERRED_STACK_BOUNDARY])
2428
2429 #define VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM \
2430                                         ((FIRST_VIRTUAL_REGISTER) + 5)
2431
2432 #define LAST_VIRTUAL_REGISTER           ((FIRST_VIRTUAL_REGISTER) + 5)
2433
2434 /* Nonzero if REGNUM is a pointer into the stack frame.  */
2435 #define REGNO_PTR_FRAME_P(REGNUM)               \
2436   ((REGNUM) == STACK_POINTER_REGNUM             \
2437    || (REGNUM) == FRAME_POINTER_REGNUM          \
2438    || (REGNUM) == HARD_FRAME_POINTER_REGNUM     \
2439    || (REGNUM) == ARG_POINTER_REGNUM            \
2440    || ((REGNUM) >= FIRST_VIRTUAL_REGISTER       \
2441        && (REGNUM) <= LAST_VIRTUAL_POINTER_REGISTER))
2442
2443 /* REGNUM never really appearing in the INSN stream.  */
2444 #define INVALID_REGNUM                  (~(unsigned int) 0)
2445
2446 /* REGNUM for which no debug information can be generated.  */
2447 #define IGNORED_DWARF_REGNUM            (INVALID_REGNUM - 1)
2448
2449 extern rtx output_constant_def (tree, int);
2450 extern rtx lookup_constant_def (tree);
2451
2452 /* Nonzero after end of reload pass.
2453    Set to 1 or 0 by reload1.c.  */
2454
2455 extern int reload_completed;
2456
2457 /* Nonzero after thread_prologue_and_epilogue_insns has run.  */
2458 extern int epilogue_completed;
2459
2460 /* Set to 1 while reload_as_needed is operating.
2461    Required by some machines to handle any generated moves differently.  */
2462
2463 extern int reload_in_progress;
2464
2465 /* Set to 1 while in lra.  */
2466 extern int lra_in_progress;
2467
2468 /* This macro indicates whether you may create a new
2469    pseudo-register.  */
2470
2471 #define can_create_pseudo_p() (!reload_in_progress && !reload_completed)
2472
2473 #ifdef STACK_REGS
2474 /* Nonzero after end of regstack pass.
2475    Set to 1 or 0 by reg-stack.c.  */
2476 extern int regstack_completed;
2477 #endif
2478
2479 /* If this is nonzero, we do not bother generating VOLATILE
2480    around volatile memory references, and we are willing to
2481    output indirect addresses.  If cse is to follow, we reject
2482    indirect addresses so a useful potential cse is generated;
2483    if it is used only once, instruction combination will produce
2484    the same indirect address eventually.  */
2485 extern int cse_not_expected;
2486
2487 /* Translates rtx code to tree code, for those codes needed by
2488    REAL_ARITHMETIC.  The function returns an int because the caller may not
2489    know what `enum tree_code' means.  */
2490
2491 extern int rtx_to_tree_code (enum rtx_code);
2492
2493 /* In cse.c */
2494 extern int delete_trivially_dead_insns (rtx, int);
2495 extern int exp_equiv_p (const_rtx, const_rtx, int, bool);
2496 extern unsigned hash_rtx (const_rtx x, enum machine_mode, int *, int *, bool);
2497
2498 /* In dse.c */
2499 extern bool check_for_inc_dec (rtx insn);
2500
2501 /* In jump.c */
2502 extern int comparison_dominates_p (enum rtx_code, enum rtx_code);
2503 extern bool jump_to_label_p (rtx);
2504 extern int condjump_p (const_rtx);
2505 extern int any_condjump_p (const_rtx);
2506 extern int any_uncondjump_p (const_rtx);
2507 extern rtx pc_set (const_rtx);
2508 extern rtx condjump_label (const_rtx);
2509 extern int simplejump_p (const_rtx);
2510 extern int returnjump_p (rtx);
2511 extern int eh_returnjump_p (rtx);
2512 extern int onlyjump_p (const_rtx);
2513 extern int only_sets_cc0_p (const_rtx);
2514 extern int sets_cc0_p (const_rtx);
2515 extern int invert_jump_1 (rtx, rtx);
2516 extern int invert_jump (rtx, rtx, int);
2517 extern int rtx_renumbered_equal_p (const_rtx, const_rtx);
2518 extern int true_regnum (const_rtx);
2519 extern unsigned int reg_or_subregno (const_rtx);
2520 extern int redirect_jump_1 (rtx, rtx);
2521 extern void redirect_jump_2 (rtx, rtx, rtx, int, int);
2522 extern int redirect_jump (rtx, rtx, int);
2523 extern void rebuild_jump_labels (rtx);
2524 extern void rebuild_jump_labels_chain (rtx);
2525 extern rtx reversed_comparison (const_rtx, enum machine_mode);
2526 extern enum rtx_code reversed_comparison_code (const_rtx, const_rtx);
2527 extern enum rtx_code reversed_comparison_code_parts (enum rtx_code, const_rtx,
2528                                                      const_rtx, const_rtx);
2529 extern void delete_for_peephole (rtx, rtx);
2530 extern int condjump_in_parallel_p (const_rtx);
2531
2532 /* In emit-rtl.c.  */
2533 extern int max_reg_num (void);
2534 extern int max_label_num (void);
2535 extern int get_first_label_num (void);
2536 extern void maybe_set_first_label_num (rtx);
2537 extern void delete_insns_since (rtx);
2538 extern void mark_reg_pointer (rtx, int);
2539 extern void mark_user_reg (rtx);
2540 extern void reset_used_flags (rtx);
2541 extern void set_used_flags (rtx);
2542 extern void reorder_insns (rtx, rtx, rtx);
2543 extern void reorder_insns_nobb (rtx, rtx, rtx);
2544 extern int get_max_insn_count (void);
2545 extern int in_sequence_p (void);
2546 extern void init_emit (void);
2547 extern void init_emit_regs (void);
2548 extern void init_emit_once (void);
2549 extern void push_topmost_sequence (void);
2550 extern void pop_topmost_sequence (void);
2551 extern void set_new_first_and_last_insn (rtx, rtx);
2552 extern unsigned int unshare_all_rtl (void);
2553 extern void unshare_all_rtl_again (rtx);
2554 extern void unshare_all_rtl_in_chain (rtx);
2555 extern void verify_rtl_sharing (void);
2556 extern void add_insn (rtx);
2557 extern void add_insn_before (rtx, rtx, basic_block);
2558 extern void add_insn_after (rtx, rtx, basic_block);
2559 extern void remove_insn (rtx);
2560 extern rtx emit (rtx);
2561 extern void delete_insn (rtx);
2562 extern rtx entry_of_function (void);
2563 extern void emit_insn_at_entry (rtx);
2564 extern void delete_insn_chain (rtx, rtx, bool);
2565 extern rtx unlink_insn_chain (rtx, rtx);
2566 extern void delete_insn_and_edges (rtx);
2567 extern rtx gen_lowpart_SUBREG (enum machine_mode, rtx);
2568 extern rtx gen_const_mem (enum machine_mode, rtx);
2569 extern rtx gen_frame_mem (enum machine_mode, rtx);
2570 extern rtx gen_tmp_stack_mem (enum machine_mode, rtx);
2571 extern bool validate_subreg (enum machine_mode, enum machine_mode,
2572                              const_rtx, unsigned int);
2573
2574 /* In combine.c  */
2575 extern unsigned int extended_count (const_rtx, enum machine_mode, int);
2576 extern rtx remove_death (unsigned int, rtx);
2577 extern void dump_combine_stats (FILE *);
2578 extern void dump_combine_total_stats (FILE *);
2579 extern rtx make_compound_operation (rtx, enum rtx_code);
2580
2581 /* In cfgcleanup.c  */
2582 extern void delete_dead_jumptables (void);
2583
2584 /* In sched-rgn.c.  */
2585 extern void schedule_insns (void);
2586
2587 /* In sched-ebb.c.  */
2588 extern void schedule_ebbs (void);
2589
2590 /* In sel-sched-dump.c.  */
2591 extern void sel_sched_fix_param (const char *param, const char *val);
2592
2593 /* In print-rtl.c */
2594 extern const char *print_rtx_head;
2595 extern void debug (const rtx_def &ref);
2596 extern void debug (const rtx_def *ptr);
2597 extern void debug_rtx (const_rtx);
2598 extern void debug_rtx_list (const_rtx, int);
2599 extern void debug_rtx_range (const_rtx, const_rtx);
2600 extern const_rtx debug_rtx_find (const_rtx, int);
2601 extern void print_mem_expr (FILE *, const_tree);
2602 extern void print_rtl (FILE *, const_rtx);
2603 extern void print_simple_rtl (FILE *, const_rtx);
2604 extern int print_rtl_single (FILE *, const_rtx);
2605 extern int print_rtl_single_with_indent (FILE *, const_rtx, int);
2606 extern void print_inline_rtx (FILE *, const_rtx, int);
2607
2608 /* Functions in sched-vis.c.  FIXME: Ideally these functions would
2609    not be in sched-vis.c but in rtl.c, because they are not only used
2610    by the scheduler anymore but for all "slim" RTL dumping.  */
2611 extern void dump_value_slim (FILE *, const_rtx, int);
2612 extern void dump_insn_slim (FILE *, const_rtx);
2613 extern void dump_rtl_slim (FILE *, const_rtx, const_rtx, int, int);
2614 extern void print_value (pretty_printer *, const_rtx, int);
2615 extern void print_pattern (pretty_printer *, const_rtx, int);
2616 extern void print_insn (pretty_printer *, const_rtx, int);
2617 extern void rtl_dump_bb_for_graph (pretty_printer *, basic_block);
2618 extern const char *str_pattern_slim (const_rtx);
2619
2620 /* In function.c */
2621 extern void reposition_prologue_and_epilogue_notes (void);
2622 extern int prologue_epilogue_contains (const_rtx);
2623 extern int sibcall_epilogue_contains (const_rtx);
2624 extern void update_temp_slot_address (rtx, rtx);
2625 extern void maybe_copy_prologue_epilogue_insn (rtx, rtx);
2626 extern void set_return_jump_label (rtx);
2627
2628 /* In stmt.c */
2629 extern void expand_null_return (void);
2630 extern void expand_naked_return (void);
2631 extern void emit_jump (rtx);
2632
2633 /* In expr.c */
2634 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
2635                            unsigned int, int);
2636 extern HOST_WIDE_INT find_args_size_adjust (rtx);
2637 extern int fixup_args_size_notes (rtx, rtx, int);
2638
2639 /* In cfgrtl.c */
2640 extern void print_rtl_with_bb (FILE *, const_rtx, int);
2641 extern rtx duplicate_insn_chain (rtx, rtx);
2642
2643 /* In expmed.c */
2644 extern void init_expmed (void);
2645 extern void expand_inc (rtx, rtx);
2646 extern void expand_dec (rtx, rtx);
2647
2648 /* In lower-subreg.c */
2649 extern void init_lower_subreg (void);
2650
2651 /* In gcse.c */
2652 extern bool can_copy_p (enum machine_mode);
2653 extern bool can_assign_to_reg_without_clobbers_p (rtx);
2654 extern rtx fis_get_condition (rtx);
2655
2656 /* In ira.c */
2657 #ifdef HARD_CONST
2658 extern HARD_REG_SET eliminable_regset;
2659 #endif
2660 extern void mark_elimination (int, int);
2661
2662 /* In reginfo.c */
2663 extern int reg_classes_intersect_p (reg_class_t, reg_class_t);
2664 extern int reg_class_subset_p (reg_class_t, reg_class_t);
2665 extern void globalize_reg (tree, int);
2666 extern void init_reg_modes_target (void);
2667 extern void init_regs (void);
2668 extern void reinit_regs (void);
2669 extern void init_fake_stack_mems (void);
2670 extern void save_register_info (void);
2671 extern void init_reg_sets (void);
2672 extern void regclass (rtx, int);
2673 extern void reg_scan (rtx, unsigned int);
2674 extern void fix_register (const char *, int, int);
2675 extern bool invalid_mode_change_p (unsigned int, enum reg_class);
2676
2677 /* In reload1.c */
2678 extern int function_invariant_p (const_rtx);
2679
2680 /* In calls.c */
2681 enum libcall_type
2682 {
2683   LCT_NORMAL = 0,
2684   LCT_CONST = 1,
2685   LCT_PURE = 2,
2686   LCT_NORETURN = 3,
2687   LCT_THROW = 4,
2688   LCT_RETURNS_TWICE = 5
2689 };
2690
2691 extern void emit_library_call (rtx, enum libcall_type, enum machine_mode, int,
2692                                ...);
2693 extern rtx emit_library_call_value (rtx, rtx, enum libcall_type,
2694                                     enum machine_mode, int, ...);
2695
2696 /* In varasm.c */
2697 extern void init_varasm_once (void);
2698
2699 extern rtx make_debug_expr_from_rtl (const_rtx);
2700
2701 /* In read-rtl.c */
2702 extern bool read_rtx (const char *, rtx *);
2703
2704 /* In alias.c */
2705 extern rtx canon_rtx (rtx);
2706 extern int true_dependence (const_rtx, enum machine_mode, const_rtx);
2707 extern rtx get_addr (rtx);
2708 extern int canon_true_dependence (const_rtx, enum machine_mode, rtx,
2709                                   const_rtx, rtx);
2710 extern int read_dependence (const_rtx, const_rtx);
2711 extern int anti_dependence (const_rtx, const_rtx);
2712 extern int canon_anti_dependence (const_rtx, bool,
2713                                   const_rtx, enum machine_mode, rtx);
2714 extern int output_dependence (const_rtx, const_rtx);
2715 extern int may_alias_p (const_rtx, const_rtx);
2716 extern void init_alias_target (void);
2717 extern void init_alias_analysis (void);
2718 extern void end_alias_analysis (void);
2719 extern void vt_equate_reg_base_value (const_rtx, const_rtx);
2720 extern bool memory_modified_in_insn_p (const_rtx, const_rtx);
2721 extern bool memory_must_be_modified_in_insn_p (const_rtx, const_rtx);
2722 extern bool may_be_sp_based_p (rtx);
2723 extern rtx gen_hard_reg_clobber (enum machine_mode, unsigned int);
2724 extern rtx get_reg_known_value (unsigned int);
2725 extern bool get_reg_known_equiv_p (unsigned int);
2726 extern rtx get_reg_base_value (unsigned int);
2727
2728 #ifdef STACK_REGS
2729 extern int stack_regs_mentioned (const_rtx insn);
2730 #endif
2731
2732 /* In toplev.c */
2733 extern GTY(()) rtx stack_limit_rtx;
2734
2735 /* In predict.c */
2736 extern void invert_br_probabilities (rtx);
2737 extern bool expensive_function_p (int);
2738
2739 /* In var-tracking.c */
2740 extern unsigned int variable_tracking_main (void);
2741
2742 /* In stor-layout.c.  */
2743 extern void get_mode_bounds (enum machine_mode, int, enum machine_mode,
2744                              rtx *, rtx *);
2745
2746 /* In loop-unswitch.c  */
2747 extern rtx reversed_condition (rtx);
2748 extern rtx compare_and_jump_seq (rtx, rtx, enum rtx_code, rtx, int, rtx);
2749
2750 /* In loop-iv.c  */
2751 extern rtx canon_condition (rtx);
2752 extern void simplify_using_condition (rtx, rtx *, bitmap);
2753
2754 /* In final.c  */
2755 extern unsigned int compute_alignments (void);
2756 extern void update_alignments (vec<rtx> &);
2757 extern int asm_str_count (const char *templ);
2758 \f
2759 struct rtl_hooks
2760 {
2761   rtx (*gen_lowpart) (enum machine_mode, rtx);
2762   rtx (*gen_lowpart_no_emit) (enum machine_mode, rtx);
2763   rtx (*reg_nonzero_bits) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2764                            unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
2765   rtx (*reg_num_sign_bit_copies) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2766                                   unsigned int, unsigned int *);
2767   bool (*reg_truncated_to_mode) (enum machine_mode, const_rtx);
2768
2769   /* Whenever you add entries here, make sure you adjust rtlhooks-def.h.  */
2770 };
2771
2772 /* Each pass can provide its own.  */
2773 extern struct rtl_hooks rtl_hooks;
2774
2775 /* ... but then it has to restore these.  */
2776 extern const struct rtl_hooks general_rtl_hooks;
2777
2778 /* Keep this for the nonce.  */
2779 #define gen_lowpart rtl_hooks.gen_lowpart
2780
2781 extern void insn_locations_init (void);
2782 extern void insn_locations_finalize (void);
2783 extern void set_curr_insn_location (location_t);
2784 extern location_t curr_insn_location (void);
2785 extern bool optimize_insn_for_size_p (void);
2786 extern bool optimize_insn_for_speed_p (void);
2787
2788 /* rtl-error.c */
2789 extern void _fatal_insn_not_found (const_rtx, const char *, int, const char *)
2790      ATTRIBUTE_NORETURN;
2791 extern void _fatal_insn (const char *, const_rtx, const char *, int, const char *)
2792      ATTRIBUTE_NORETURN;
2793
2794 #define fatal_insn(msgid, insn) \
2795         _fatal_insn (msgid, insn, __FILE__, __LINE__, __FUNCTION__)
2796 #define fatal_insn_not_found(insn) \
2797         _fatal_insn_not_found (insn, __FILE__, __LINE__, __FUNCTION__)
2798
2799
2800
2801 #endif /* ! GCC_RTL_H */