gcc/rtl.h

   1 /* Register Transfer Language (RTL) definitions for GCC
   2    Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_RTL_H
  23 #define GCC_RTL_H
  24
  25 #include "statistics.h"
  26 #include "machmode.h"
  27 #include "input.h"
  28 #include "real.h"
  29 #include "vec.h"
  30 #include "vecir.h"
  31 #include "fixed-value.h"
  32 #include "alias.h"
  33 #include "hashtab.h"
  34
  35 #undef FFS  /* Some systems predefine this symbol; don't let it interfere.  */
  36 #undef FLOAT /* Likewise.  */
  37 #undef ABS /* Likewise.  */
  38 #undef PC /* Likewise.  */
  39
  40 /* Value used by some passes to "recognize" noop moves as valid
  41  instructions.  */
  42 #define NOOP_MOVE_INSN_CODE     INT_MAX
  43
  44 /* Register Transfer Language EXPRESSIONS CODES */
  45
  46 #define RTX_CODE        enum rtx_code
  47 enum rtx_code  {
  48
  49 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   ENUM ,
  50 #include "rtl.def"              /* rtl expressions are documented here */
  51 #undef DEF_RTL_EXPR
  52
  53   LAST_AND_UNUSED_RTX_CODE};    /* A convenient way to get a value for
  54                                    NUM_RTX_CODE.
  55                                    Assumes default enum value assignment.  */
  56
  57 #define NUM_RTX_CODE ((int) LAST_AND_UNUSED_RTX_CODE)
  58                                 /* The cast here, saves many elsewhere.  */
  59
  60 /* Register Transfer Language EXPRESSIONS CODE CLASSES */
  61
  62 enum rtx_class  {
  63   /* We check bit 0-1 of some rtx class codes in the predicates below.  */
  64
  65   /* Bit 0 = comparison if 0, arithmetic is 1
  66      Bit 1 = 1 if commutative.  */
  67   RTX_COMPARE,          /* 0 */
  68   RTX_COMM_COMPARE,
  69   RTX_BIN_ARITH,
  70   RTX_COMM_ARITH,
  71
  72   /* Must follow the four preceding values.  */
  73   RTX_UNARY,            /* 4 */
  74
  75   RTX_EXTRA,
  76   RTX_MATCH,
  77   RTX_INSN,
  78
  79   /* Bit 0 = 1 if constant.  */
  80   RTX_OBJ,              /* 8 */
  81   RTX_CONST_OBJ,
  82
  83   RTX_TERNARY,
  84   RTX_BITFIELD_OPS,
  85   RTX_AUTOINC
  86 };
  87
  88 #define RTX_OBJ_MASK (~1)
  89 #define RTX_OBJ_RESULT (RTX_OBJ & RTX_OBJ_MASK)
  90 #define RTX_COMPARE_MASK (~1)
  91 #define RTX_COMPARE_RESULT (RTX_COMPARE & RTX_COMPARE_MASK)
  92 #define RTX_ARITHMETIC_MASK (~1)
  93 #define RTX_ARITHMETIC_RESULT (RTX_COMM_ARITH & RTX_ARITHMETIC_MASK)
  94 #define RTX_BINARY_MASK (~3)
  95 #define RTX_BINARY_RESULT (RTX_COMPARE & RTX_BINARY_MASK)
  96 #define RTX_COMMUTATIVE_MASK (~2)
  97 #define RTX_COMMUTATIVE_RESULT (RTX_COMM_COMPARE & RTX_COMMUTATIVE_MASK)
  98 #define RTX_NON_COMMUTATIVE_RESULT (RTX_COMPARE & RTX_COMMUTATIVE_MASK)
  99
 100 extern const unsigned char rtx_length[NUM_RTX_CODE];
 101 #define GET_RTX_LENGTH(CODE)            (rtx_length[(int) (CODE)])
 102
 103 extern const char * const rtx_name[NUM_RTX_CODE];
 104 #define GET_RTX_NAME(CODE)              (rtx_name[(int) (CODE)])
 105
 106 extern const char * const rtx_format[NUM_RTX_CODE];
 107 #define GET_RTX_FORMAT(CODE)            (rtx_format[(int) (CODE)])
 108
 109 extern const enum rtx_class rtx_class[NUM_RTX_CODE];
 110 #define GET_RTX_CLASS(CODE)             (rtx_class[(int) (CODE)])
 111
 112 extern const unsigned char rtx_code_size[NUM_RTX_CODE];
 113 extern const unsigned char rtx_next[NUM_RTX_CODE];
 114 \f
 115 /* The flags and bitfields of an ADDR_DIFF_VEC.  BASE is the base label
 116    relative to which the offsets are calculated, as explained in rtl.def.  */
 117 typedef struct
 118 {
 119   /* Set at the start of shorten_branches - ONLY WHEN OPTIMIZING - : */
 120   unsigned min_align: 8;
 121   /* Flags: */
 122   unsigned base_after_vec: 1; /* BASE is after the ADDR_DIFF_VEC.  */
 123   unsigned min_after_vec: 1;  /* minimum address target label is
 124                                  after the ADDR_DIFF_VEC.  */
 125   unsigned max_after_vec: 1;  /* maximum address target label is
 126                                  after the ADDR_DIFF_VEC.  */
 127   unsigned min_after_base: 1; /* minimum address target label is
 128                                  after BASE.  */
 129   unsigned max_after_base: 1; /* maximum address target label is
 130                                  after BASE.  */
 131   /* Set by the actual branch shortening process - ONLY WHEN OPTIMIZING - : */
 132   unsigned offset_unsigned: 1; /* offsets have to be treated as unsigned.  */
 133   unsigned : 2;
 134   unsigned scale : 8;
 135 } addr_diff_vec_flags;
 136
 137 /* Structure used to describe the attributes of a MEM.  These are hashed
 138    so MEMs that the same attributes share a data structure.  This means
 139    they cannot be modified in place.  */
 140 typedef struct GTY(()) mem_attrs
 141 {
 142   /* The expression that the MEM accesses, or null if not known.
 143      This expression might be larger than the memory reference itself.
 144      (In other words, the MEM might access only part of the object.)  */
 145   tree expr;
 146
 147   /* The offset of the memory reference from the start of EXPR.
 148      Only valid if OFFSET_KNOWN_P.  */
 149   HOST_WIDE_INT offset;
 150
 151   /* The size of the memory reference in bytes.  Only valid if
 152      SIZE_KNOWN_P.  */
 153   HOST_WIDE_INT size;
 154
 155   /* The alias set of the memory reference.  */
 156   alias_set_type alias;
 157
 158   /* The alignment of the reference in bits.  Always a multiple of
 159      BITS_PER_UNIT.  Note that EXPR may have a stricter alignment
 160      than the memory reference itself.  */
 161   unsigned int align;
 162
 163   /* The address space that the memory reference uses.  */
 164   unsigned char addrspace;
 165
 166   /* True if OFFSET is known.  */
 167   bool offset_known_p;
 168
 169   /* True if SIZE is known.  */
 170   bool size_known_p;
 171 } mem_attrs;
 172
 173 /* Structure used to describe the attributes of a REG in similar way as
 174    mem_attrs does for MEM above.  Note that the OFFSET field is calculated
 175    in the same way as for mem_attrs, rather than in the same way as a
 176    SUBREG_BYTE.  For example, if a big-endian target stores a byte
 177    object in the low part of a 4-byte register, the OFFSET field
 178    will be -3 rather than 0.  */
 179
 180 typedef struct GTY(()) reg_attrs {
 181   tree decl;                    /* decl corresponding to REG.  */
 182   HOST_WIDE_INT offset;         /* Offset from start of DECL.  */
 183 } reg_attrs;
 184
 185 /* Common union for an element of an rtx.  */
 186
 187 union rtunion_def
 188 {
 189   int rt_int;
 190   unsigned int rt_uint;
 191   const char *rt_str;
 192   rtx rt_rtx;
 193   rtvec rt_rtvec;
 194   enum machine_mode rt_type;
 195   addr_diff_vec_flags rt_addr_diff_vec_flags;
 196   struct cselib_val_struct *rt_cselib;
 197   tree rt_tree;
 198   struct basic_block_def *rt_bb;
 199   mem_attrs *rt_mem;
 200   reg_attrs *rt_reg;
 201   struct constant_descriptor_rtx *rt_constant;
 202   struct dw_cfi_struct *rt_cfi;
 203 };
 204 typedef union rtunion_def rtunion;
 205
 206 /* This structure remembers the position of a SYMBOL_REF within an
 207    object_block structure.  A SYMBOL_REF only provides this information
 208    if SYMBOL_REF_HAS_BLOCK_INFO_P is true.  */
 209 struct GTY(()) block_symbol {
 210   /* The usual SYMBOL_REF fields.  */
 211   rtunion GTY ((skip)) fld[3];
 212
 213   /* The block that contains this object.  */
 214   struct object_block *block;
 215
 216   /* The offset of this object from the start of its block.  It is negative
 217      if the symbol has not yet been assigned an offset.  */
 218   HOST_WIDE_INT offset;
 219 };
 220
 221 /* Describes a group of objects that are to be placed together in such
 222    a way that their relative positions are known.  */
 223 struct GTY(()) object_block {
 224   /* The section in which these objects should be placed.  */
 225   section *sect;
 226
 227   /* The alignment of the first object, measured in bits.  */
 228   unsigned int alignment;
 229
 230   /* The total size of the objects, measured in bytes.  */
 231   HOST_WIDE_INT size;
 232
 233   /* The SYMBOL_REFs for each object.  The vector is sorted in
 234      order of increasing offset and the following conditions will
 235      hold for each element X:
 236
 237          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 238          !SYMBOL_REF_ANCHOR_P (X)
 239          SYMBOL_REF_BLOCK (X) == [address of this structure]
 240          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 241   VEC(rtx,gc) *objects;
 242
 243   /* All the anchor SYMBOL_REFs used to address these objects, sorted
 244      in order of increasing offset, and then increasing TLS model.
 245      The following conditions will hold for each element X in this vector:
 246
 247          SYMBOL_REF_HAS_BLOCK_INFO_P (X)
 248          SYMBOL_REF_ANCHOR_P (X)
 249          SYMBOL_REF_BLOCK (X) == [address of this structure]
 250          SYMBOL_REF_BLOCK_OFFSET (X) >= 0.  */
 251   VEC(rtx,gc) *anchors;
 252 };
 253
 254 /* RTL expression ("rtx").  */
 255
 256 struct GTY((chain_next ("RTX_NEXT (&%h)"),
 257             chain_prev ("RTX_PREV (&%h)"), variable_size)) rtx_def {
 258   /* The kind of expression this is.  */
 259   ENUM_BITFIELD(rtx_code) code: 16;
 260
 261   /* The kind of value the expression has.  */
 262   ENUM_BITFIELD(machine_mode) mode : 8;
 263
 264   /* 1 in a MEM if we should keep the alias set for this mem unchanged
 265      when we access a component.
 266      1 in a CALL_INSN if it is a sibling call.
 267      1 in a SET that is for a return.
 268      In a CODE_LABEL, part of the two-bit alternate entry field.  */
 269   unsigned int jump : 1;
 270   /* In a CODE_LABEL, part of the two-bit alternate entry field.
 271      1 in a MEM if it cannot trap.
 272      1 in a CALL_INSN logically equivalent to
 273        ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P. */
 274   unsigned int call : 1;
 275   /* 1 in a REG, MEM, or CONCAT if the value is set at most once, anywhere.
 276      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 277      1 in a SYMBOL_REF if it addresses something in the per-function
 278      constants pool.
 279      1 in a CALL_INSN logically equivalent to ECF_CONST and TREE_READONLY.
 280      1 in a NOTE, or EXPR_LIST for a const call.
 281      1 in a JUMP_INSN of an annulling branch.  */
 282   unsigned int unchanging : 1;
 283   /* 1 in a MEM or ASM_OPERANDS expression if the memory reference is volatile.
 284      1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL, BARRIER, or NOTE
 285      if it has been deleted.
 286      1 in a REG expression if corresponds to a variable declared by the user,
 287      0 for an internally generated temporary.
 288      1 in a SUBREG used for SUBREG_PROMOTED_UNSIGNED_P.
 289      1 in a LABEL_REF, REG_LABEL_TARGET or REG_LABEL_OPERAND note for a
 290      non-local label.
 291      In a SYMBOL_REF, this flag is used for machine-specific purposes.
 292      In a PREFETCH, this flag indicates that it should be considered a scheduling
 293      barrier.  */
 294   unsigned int volatil : 1;
 295   /* 1 in a MEM referring to a field of an aggregate.
 296      0 if the MEM was a variable or the result of a * operator in C;
 297      1 if it was the result of a . or -> operator (on a struct) in C.
 298      1 in a REG if the register is used only in exit code a loop.
 299      1 in a SUBREG expression if was generated from a variable with a
 300      promoted mode.
 301      1 in a CODE_LABEL if the label is used for nonlocal gotos
 302      and must not be deleted even if its count is zero.
 303      1 in an INSN, JUMP_INSN or CALL_INSN if this insn must be scheduled
 304      together with the preceding insn.  Valid only within sched.
 305      1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
 306      from the target of a branch.  Valid from reorg until end of compilation;
 307      cleared before used.  */
 308   unsigned int in_struct : 1;
 309   /* At the end of RTL generation, 1 if this rtx is used.  This is used for
 310      copying shared structure.  See `unshare_all_rtl'.
 311      In a REG, this is not needed for that purpose, and used instead
 312      in `leaf_renumber_regs_insn'.
 313      1 in a SYMBOL_REF, means that emit_library_call
 314      has used it as the function.  */
 315   unsigned int used : 1;
 316   /* 1 in an INSN or a SET if this rtx is related to the call frame,
 317      either changing how we compute the frame address or saving and
 318      restoring registers in the prologue and epilogue.
 319      1 in a REG or MEM if it is a pointer.
 320      1 in a SYMBOL_REF if it addresses something in the per-function
 321      constant string pool.  */
 322   unsigned frame_related : 1;
 323   /* 1 in a REG or PARALLEL that is the current function's return value.
 324      1 in a MEM if it refers to a scalar.
 325      1 in a SYMBOL_REF for a weak symbol.
 326      1 in a CALL_INSN logically equivalent to ECF_PURE and DECL_PURE_P. */
 327   unsigned return_val : 1;
 328
 329   /* The first element of the operands of this rtx.
 330      The number of operands and their types are controlled
 331      by the `code' field, according to rtl.def.  */
 332   union u {
 333     rtunion fld[1];
 334     HOST_WIDE_INT hwint[1];
 335     struct block_symbol block_sym;
 336     struct real_value rv;
 337     struct fixed_value fv;
 338   } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
 339 };
 340
 341 /* The size in bytes of an rtx header (code, mode and flags).  */
 342 #define RTX_HDR_SIZE offsetof (struct rtx_def, u)
 343
 344 /* The size in bytes of an rtx with code CODE.  */
 345 #define RTX_CODE_SIZE(CODE) rtx_code_size[CODE]
 346
 347 #define NULL_RTX (rtx) 0
 348
 349 /* The "next" and "previous" RTX, relative to this one.  */
 350
 351 #define RTX_NEXT(X) (rtx_next[GET_CODE (X)] == 0 ? NULL                 \
 352                      : *(rtx *)(((char *)X) + rtx_next[GET_CODE (X)]))
 353
 354 /* FIXME: the "NEXT_INSN (PREV_INSN (X)) == X" condition shouldn't be needed.
 355  */
 356 #define RTX_PREV(X) ((INSN_P (X)                        \
 357                       || NOTE_P (X)                     \
 358                       || BARRIER_P (X)                  \
 359                       || LABEL_P (X))                   \
 360                      && PREV_INSN (X) != NULL           \
 361                      && NEXT_INSN (PREV_INSN (X)) == X  \
 362                      ? PREV_INSN (X) : NULL)
 363
 364 /* Define macros to access the `code' field of the rtx.  */
 365
 366 #define GET_CODE(RTX)       ((enum rtx_code) (RTX)->code)
 367 #define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
 368
 369 #define GET_MODE(RTX)       ((enum machine_mode) (RTX)->mode)
 370 #define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
 371
 372 /* RTL vector.  These appear inside RTX's when there is a need
 373    for a variable number of things.  The principle use is inside
 374    PARALLEL expressions.  */
 375
 376 struct GTY((variable_size)) rtvec_def {
 377   int num_elem;         /* number of elements */
 378   rtx GTY ((length ("%h.num_elem"))) elem[1];
 379 };
 380
 381 #define NULL_RTVEC (rtvec) 0
 382
 383 #define GET_NUM_ELEM(RTVEC)             ((RTVEC)->num_elem)
 384 #define PUT_NUM_ELEM(RTVEC, NUM)        ((RTVEC)->num_elem = (NUM))
 385
 386 /* Predicate yielding nonzero iff X is an rtx for a register.  */
 387 #define REG_P(X) (GET_CODE (X) == REG)
 388
 389 /* Predicate yielding nonzero iff X is an rtx for a memory location.  */
 390 #define MEM_P(X) (GET_CODE (X) == MEM)
 391
 392 /* Predicate yielding nonzero iff X is an rtx for a constant integer.  */
 393 #define CONST_INT_P(X) (GET_CODE (X) == CONST_INT)
 394
 395 /* Predicate yielding true iff X is an rtx for a double-int
 396    or floating point constant.  */
 397 #define CONST_DOUBLE_P(X) (GET_CODE (X) == CONST_DOUBLE)
 398
 399 /* Predicate yielding nonzero iff X is a label insn.  */
 400 #define LABEL_P(X) (GET_CODE (X) == CODE_LABEL)
 401
 402 /* Predicate yielding nonzero iff X is a jump insn.  */
 403 #define JUMP_P(X) (GET_CODE (X) == JUMP_INSN)
 404
 405 /* Predicate yielding nonzero iff X is a call insn.  */
 406 #define CALL_P(X) (GET_CODE (X) == CALL_INSN)
 407
 408 /* Predicate yielding nonzero iff X is an insn that cannot jump.  */
 409 #define NONJUMP_INSN_P(X) (GET_CODE (X) == INSN)
 410
 411 /* Predicate yielding nonzero iff X is a debug note/insn.  */
 412 #define DEBUG_INSN_P(X) (GET_CODE (X) == DEBUG_INSN)
 413
 414 /* Predicate yielding nonzero iff X is an insn that is not a debug insn.  */
 415 #define NONDEBUG_INSN_P(X) (INSN_P (X) && !DEBUG_INSN_P (X))
 416
 417 /* Nonzero if DEBUG_INSN_P may possibly hold.  */
 418 #define MAY_HAVE_DEBUG_INSNS MAY_HAVE_DEBUG_STMTS
 419
 420 /* Predicate yielding nonzero iff X is a real insn.  */
 421 #define INSN_P(X) \
 422   (NONJUMP_INSN_P (X) || DEBUG_INSN_P (X) || JUMP_P (X) || CALL_P (X))
 423
 424 /* Predicate yielding nonzero iff X is a note insn.  */
 425 #define NOTE_P(X) (GET_CODE (X) == NOTE)
 426
 427 /* Predicate yielding nonzero iff X is a barrier insn.  */
 428 #define BARRIER_P(X) (GET_CODE (X) == BARRIER)
 429
 430 /* Predicate yielding nonzero iff X is a data for a jump table.  */
 431 #define JUMP_TABLE_DATA_P(INSN) \
 432   (JUMP_P (INSN) && (GET_CODE (PATTERN (INSN)) == ADDR_VEC || \
 433                      GET_CODE (PATTERN (INSN)) == ADDR_DIFF_VEC))
 434
 435 /* Predicate yielding nonzero iff X is a return or simple_return.  */
 436 #define ANY_RETURN_P(X) \
 437   (GET_CODE (X) == RETURN || GET_CODE (X) == SIMPLE_RETURN)
 438
 439 /* 1 if X is a unary operator.  */
 440
 441 #define UNARY_P(X)   \
 442   (GET_RTX_CLASS (GET_CODE (X)) == RTX_UNARY)
 443
 444 /* 1 if X is a binary operator.  */
 445
 446 #define BINARY_P(X)   \
 447   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_BINARY_MASK) == RTX_BINARY_RESULT)
 448
 449 /* 1 if X is an arithmetic operator.  */
 450
 451 #define ARITHMETIC_P(X)   \
 452   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_ARITHMETIC_MASK)                 \
 453     == RTX_ARITHMETIC_RESULT)
 454
 455 /* 1 if X is an arithmetic operator.  */
 456
 457 #define COMMUTATIVE_ARITH_P(X)   \
 458   (GET_RTX_CLASS (GET_CODE (X)) == RTX_COMM_ARITH)
 459
 460 /* 1 if X is a commutative arithmetic operator or a comparison operator.
 461    These two are sometimes selected together because it is possible to
 462    swap the two operands.  */
 463
 464 #define SWAPPABLE_OPERANDS_P(X)   \
 465   ((1 << GET_RTX_CLASS (GET_CODE (X)))                                  \
 466     & ((1 << RTX_COMM_ARITH) | (1 << RTX_COMM_COMPARE)                  \
 467        | (1 << RTX_COMPARE)))
 468
 469 /* 1 if X is a non-commutative operator.  */
 470
 471 #define NON_COMMUTATIVE_P(X)   \
 472   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 473     == RTX_NON_COMMUTATIVE_RESULT)
 474
 475 /* 1 if X is a commutative operator on integers.  */
 476
 477 #define COMMUTATIVE_P(X)   \
 478   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMMUTATIVE_MASK)                \
 479     == RTX_COMMUTATIVE_RESULT)
 480
 481 /* 1 if X is a relational operator.  */
 482
 483 #define COMPARISON_P(X)   \
 484   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_COMPARE_MASK) == RTX_COMPARE_RESULT)
 485
 486 /* 1 if X is a constant value that is an integer.  */
 487
 488 #define CONSTANT_P(X)   \
 489   (GET_RTX_CLASS (GET_CODE (X)) == RTX_CONST_OBJ)
 490
 491 /* 1 if X can be used to represent an object.  */
 492 #define OBJECT_P(X)                                                     \
 493   ((GET_RTX_CLASS (GET_CODE (X)) & RTX_OBJ_MASK) == RTX_OBJ_RESULT)
 494
 495 /* General accessor macros for accessing the fields of an rtx.  */
 496
 497 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 498 /* The bit with a star outside the statement expr and an & inside is
 499    so that N can be evaluated only once.  */
 500 #define RTL_CHECK1(RTX, N, C1) __extension__                            \
 501 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 502      const enum rtx_code _code = GET_CODE (_rtx);                       \
 503      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 504        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 505                                 __FUNCTION__);                          \
 506      if (GET_RTX_FORMAT(_code)[_n] != C1)                               \
 507        rtl_check_failed_type1 (_rtx, _n, C1, __FILE__, __LINE__,        \
 508                                __FUNCTION__);                           \
 509      &_rtx->u.fld[_n]; }))
 510
 511 #define RTL_CHECK2(RTX, N, C1, C2) __extension__                        \
 512 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 513      const enum rtx_code _code = GET_CODE (_rtx);                       \
 514      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 515        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 516                                 __FUNCTION__);                          \
 517      if (GET_RTX_FORMAT(_code)[_n] != C1                                \
 518          && GET_RTX_FORMAT(_code)[_n] != C2)                            \
 519        rtl_check_failed_type2 (_rtx, _n, C1, C2, __FILE__, __LINE__,    \
 520                                __FUNCTION__);                           \
 521      &_rtx->u.fld[_n]; }))
 522
 523 #define RTL_CHECKC1(RTX, N, C) __extension__                            \
 524 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 525      if (GET_CODE (_rtx) != (C))                                        \
 526        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 527                                __FUNCTION__);                           \
 528      &_rtx->u.fld[_n]; }))
 529
 530 #define RTL_CHECKC2(RTX, N, C1, C2) __extension__                       \
 531 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 532      const enum rtx_code _code = GET_CODE (_rtx);                       \
 533      if (_code != (C1) && _code != (C2))                                \
 534        rtl_check_failed_code2 (_rtx, (C1), (C2), __FILE__, __LINE__,    \
 535                                __FUNCTION__); \
 536      &_rtx->u.fld[_n]; }))
 537
 538 #define RTVEC_ELT(RTVEC, I) __extension__                               \
 539 (*({ __typeof (RTVEC) const _rtvec = (RTVEC); const int _i = (I);       \
 540      if (_i < 0 || _i >= GET_NUM_ELEM (_rtvec))                         \
 541        rtvec_check_failed_bounds (_rtvec, _i, __FILE__, __LINE__,       \
 542                                   __FUNCTION__);                        \
 543      &_rtvec->elem[_i]; }))
 544
 545 #define XWINT(RTX, N) __extension__                                     \
 546 (*({ __typeof (RTX) const _rtx = (RTX); const int _n = (N);             \
 547      const enum rtx_code _code = GET_CODE (_rtx);                       \
 548      if (_n < 0 || _n >= GET_RTX_LENGTH (_code))                        \
 549        rtl_check_failed_bounds (_rtx, _n, __FILE__, __LINE__,           \
 550                                 __FUNCTION__);                          \
 551      if (GET_RTX_FORMAT(_code)[_n] != 'w')                              \
 552        rtl_check_failed_type1 (_rtx, _n, 'w', __FILE__, __LINE__,       \
 553                                __FUNCTION__);                           \
 554      &_rtx->u.hwint[_n]; }))
 555
 556 #define XCWINT(RTX, N, C) __extension__                                 \
 557 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 558      if (GET_CODE (_rtx) != (C))                                        \
 559        rtl_check_failed_code1 (_rtx, (C), __FILE__, __LINE__,           \
 560                                __FUNCTION__);                           \
 561      &_rtx->u.hwint[N]; }))
 562
 563 #define XCMWINT(RTX, N, C, M) __extension__                             \
 564 (*({ __typeof (RTX) const _rtx = (RTX);                                 \
 565      if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) != (M))              \
 566        rtl_check_failed_code_mode (_rtx, (C), (M), false, __FILE__,     \
 567                                    __LINE__, __FUNCTION__);             \
 568      &_rtx->u.hwint[N]; }))
 569
 570 #define XCNMPRV(RTX, C, M) __extension__                                \
 571 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 572    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 573      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 574                                  __LINE__, __FUNCTION__);               \
 575    &_rtx->u.rv; })
 576
 577 #define XCNMPFV(RTX, C, M) __extension__                                \
 578 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 579    if (GET_CODE (_rtx) != (C) || GET_MODE (_rtx) == (M))                \
 580      rtl_check_failed_code_mode (_rtx, (C), (M), true, __FILE__,        \
 581                                  __LINE__, __FUNCTION__);               \
 582    &_rtx->u.fv; })
 583
 584 #define BLOCK_SYMBOL_CHECK(RTX) __extension__                           \
 585 ({ __typeof (RTX) const _symbol = (RTX);                                \
 586    const unsigned int flags = RTL_CHECKC1 (_symbol, 1, SYMBOL_REF).rt_int; \
 587    if ((flags & SYMBOL_FLAG_HAS_BLOCK_INFO) == 0)                       \
 588      rtl_check_failed_block_symbol (__FILE__, __LINE__,                 \
 589                                     __FUNCTION__);                      \
 590    &_symbol->u.block_sym; })
 591
 592 extern void rtl_check_failed_bounds (const_rtx, int, const char *, int,
 593                                      const char *)
 594     ATTRIBUTE_NORETURN;
 595 extern void rtl_check_failed_type1 (const_rtx, int, int, const char *, int,
 596                                     const char *)
 597     ATTRIBUTE_NORETURN;
 598 extern void rtl_check_failed_type2 (const_rtx, int, int, int, const char *,
 599                                     int, const char *)
 600     ATTRIBUTE_NORETURN;
 601 extern void rtl_check_failed_code1 (const_rtx, enum rtx_code, const char *,
 602                                     int, const char *)
 603     ATTRIBUTE_NORETURN;
 604 extern void rtl_check_failed_code2 (const_rtx, enum rtx_code, enum rtx_code,
 605                                     const char *, int, const char *)
 606     ATTRIBUTE_NORETURN;
 607 extern void rtl_check_failed_code_mode (const_rtx, enum rtx_code, enum machine_mode,
 608                                         bool, const char *, int, const char *)
 609     ATTRIBUTE_NORETURN;
 610 extern void rtl_check_failed_block_symbol (const char *, int, const char *)
 611     ATTRIBUTE_NORETURN;
 612 extern void rtvec_check_failed_bounds (const_rtvec, int, const char *, int,
 613                                        const char *)
 614     ATTRIBUTE_NORETURN;
 615
 616 #else   /* not ENABLE_RTL_CHECKING */
 617
 618 #define RTL_CHECK1(RTX, N, C1)      ((RTX)->u.fld[N])
 619 #define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->u.fld[N])
 620 #define RTL_CHECKC1(RTX, N, C)      ((RTX)->u.fld[N])
 621 #define RTL_CHECKC2(RTX, N, C1, C2) ((RTX)->u.fld[N])
 622 #define RTVEC_ELT(RTVEC, I)         ((RTVEC)->elem[I])
 623 #define XWINT(RTX, N)               ((RTX)->u.hwint[N])
 624 #define XCWINT(RTX, N, C)           ((RTX)->u.hwint[N])
 625 #define XCMWINT(RTX, N, C, M)       ((RTX)->u.hwint[N])
 626 #define XCNMWINT(RTX, N, C, M)      ((RTX)->u.hwint[N])
 627 #define XCNMPRV(RTX, C, M)          (&(RTX)->u.rv)
 628 #define XCNMPFV(RTX, C, M)          (&(RTX)->u.fv)
 629 #define BLOCK_SYMBOL_CHECK(RTX)     (&(RTX)->u.block_sym)
 630
 631 #endif
 632
 633 /* General accessor macros for accessing the flags of an rtx.  */
 634
 635 /* Access an individual rtx flag, with no checking of any kind.  */
 636 #define RTX_FLAG(RTX, FLAG)     ((RTX)->FLAG)
 637
 638 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION >= 2007)
 639 #define RTL_FLAG_CHECK1(NAME, RTX, C1) __extension__                    \
 640 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 641    if (GET_CODE(_rtx) != C1)                                            \
 642      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 643                              __FUNCTION__);                             \
 644    _rtx; })
 645
 646 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2) __extension__                \
 647 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 648    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2)                    \
 649      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 650                               __FUNCTION__);                            \
 651    _rtx; })
 652
 653 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3) __extension__            \
 654 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 655    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 656        && GET_CODE(_rtx) != C3)                                         \
 657      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 658                              __FUNCTION__);                             \
 659    _rtx; })
 660
 661 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4) __extension__        \
 662 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 663    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 664        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4)                 \
 665      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 666                               __FUNCTION__);                            \
 667    _rtx; })
 668
 669 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5) __extension__    \
 670 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 671    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 672        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 673        && GET_CODE(_rtx) != C5)                                         \
 674      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 675                              __FUNCTION__);                             \
 676    _rtx; })
 677
 678 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              \
 679   __extension__                                                         \
 680 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 681    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 682        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 683        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6)                 \
 684      rtl_check_failed_flag  (NAME,_rtx, __FILE__, __LINE__,             \
 685                              __FUNCTION__);                             \
 686    _rtx; })
 687
 688 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          \
 689   __extension__                                                         \
 690 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 691    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 692        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 693        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6                  \
 694        && GET_CODE(_rtx) != C7)                                         \
 695      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 696                              __FUNCTION__);                             \
 697    _rtx; })
 698
 699 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      \
 700   __extension__                                                         \
 701 ({ __typeof (RTX) const _rtx = (RTX);                                   \
 702    if (GET_CODE(_rtx) != C1 && GET_CODE(_rtx) != C2                     \
 703        && GET_CODE(_rtx) != C3 && GET_CODE(_rtx) != C4                  \
 704        && GET_CODE(_rtx) != C5 && GET_CODE(_rtx) != C6                  \
 705        && GET_CODE(_rtx) != C7 && GET_CODE(_rtx) != C8)                 \
 706      rtl_check_failed_flag  (NAME, _rtx, __FILE__, __LINE__,            \
 707                              __FUNCTION__);                             \
 708    _rtx; })
 709
 710 extern void rtl_check_failed_flag (const char *, const_rtx, const char *,
 711                                    int, const char *)
 712     ATTRIBUTE_NORETURN
 713     ;
 714
 715 #else   /* not ENABLE_RTL_FLAG_CHECKING */
 716
 717 #define RTL_FLAG_CHECK1(NAME, RTX, C1)                                  (RTX)
 718 #define RTL_FLAG_CHECK2(NAME, RTX, C1, C2)                              (RTX)
 719 #define RTL_FLAG_CHECK3(NAME, RTX, C1, C2, C3)                          (RTX)
 720 #define RTL_FLAG_CHECK4(NAME, RTX, C1, C2, C3, C4)                      (RTX)
 721 #define RTL_FLAG_CHECK5(NAME, RTX, C1, C2, C3, C4, C5)          (RTX)
 722 #define RTL_FLAG_CHECK6(NAME, RTX, C1, C2, C3, C4, C5, C6)              (RTX)
 723 #define RTL_FLAG_CHECK7(NAME, RTX, C1, C2, C3, C4, C5, C6, C7)          (RTX)
 724 #define RTL_FLAG_CHECK8(NAME, RTX, C1, C2, C3, C4, C5, C6, C7, C8)      (RTX)
 725 #endif
 726
 727 #define XINT(RTX, N)    (RTL_CHECK2 (RTX, N, 'i', 'n').rt_int)
 728 #define XSTR(RTX, N)    (RTL_CHECK2 (RTX, N, 's', 'S').rt_str)
 729 #define XEXP(RTX, N)    (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
 730 #define XVEC(RTX, N)    (RTL_CHECK2 (RTX, N, 'E', 'V').rt_rtvec)
 731 #define XMODE(RTX, N)   (RTL_CHECK1 (RTX, N, 'M').rt_type)
 732 #define XTREE(RTX, N)   (RTL_CHECK1 (RTX, N, 't').rt_tree)
 733 #define XBBDEF(RTX, N)  (RTL_CHECK1 (RTX, N, 'B').rt_bb)
 734 #define XTMPL(RTX, N)   (RTL_CHECK1 (RTX, N, 'T').rt_str)
 735 #define XCFI(RTX, N)    (RTL_CHECK1 (RTX, N, 'C').rt_cfi)
 736
 737 #define XVECEXP(RTX, N, M)      RTVEC_ELT (XVEC (RTX, N), M)
 738 #define XVECLEN(RTX, N)         GET_NUM_ELEM (XVEC (RTX, N))
 739
 740 /* These are like XINT, etc. except that they expect a '0' field instead
 741    of the normal type code.  */
 742
 743 #define X0INT(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_int)
 744 #define X0UINT(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_uint)
 745 #define X0STR(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_str)
 746 #define X0EXP(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtx)
 747 #define X0VEC(RTX, N)      (RTL_CHECK1 (RTX, N, '0').rt_rtvec)
 748 #define X0MODE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_type)
 749 #define X0TREE(RTX, N)     (RTL_CHECK1 (RTX, N, '0').rt_tree)
 750 #define X0BBDEF(RTX, N)    (RTL_CHECK1 (RTX, N, '0').rt_bb)
 751 #define X0ADVFLAGS(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_addr_diff_vec_flags)
 752 #define X0CSELIB(RTX, N)   (RTL_CHECK1 (RTX, N, '0').rt_cselib)
 753 #define X0MEMATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, MEM).rt_mem)
 754 #define X0REGATTR(RTX, N)  (RTL_CHECKC1 (RTX, N, REG).rt_reg)
 755 #define X0CONSTANT(RTX, N) (RTL_CHECK1 (RTX, N, '0').rt_constant)
 756
 757 /* Access a '0' field with any type.  */
 758 #define X0ANY(RTX, N)      RTL_CHECK1 (RTX, N, '0')
 759
 760 #define XCINT(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_int)
 761 #define XCUINT(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_uint)
 762 #define XCSTR(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_str)
 763 #define XCEXP(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtx)
 764 #define XCVEC(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_rtvec)
 765 #define XCMODE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_type)
 766 #define XCTREE(RTX, N, C)     (RTL_CHECKC1 (RTX, N, C).rt_tree)
 767 #define XCBBDEF(RTX, N, C)    (RTL_CHECKC1 (RTX, N, C).rt_bb)
 768 #define XCCFI(RTX, N, C)      (RTL_CHECKC1 (RTX, N, C).rt_cfi)
 769 #define XCCSELIB(RTX, N, C)   (RTL_CHECKC1 (RTX, N, C).rt_cselib)
 770
 771 #define XCVECEXP(RTX, N, M, C)  RTVEC_ELT (XCVEC (RTX, N, C), M)
 772 #define XCVECLEN(RTX, N, C)     GET_NUM_ELEM (XCVEC (RTX, N, C))
 773
 774 #define XC2EXP(RTX, N, C1, C2)      (RTL_CHECKC2 (RTX, N, C1, C2).rt_rtx)
 775 \f
 776 /* ACCESS MACROS for particular fields of insns.  */
 777
 778 /* Holds a unique number for each insn.
 779    These are not necessarily sequentially increasing.  */
 780 #define INSN_UID(INSN)  XINT (INSN, 0)
 781
 782 /* Chain insns together in sequence.  */
 783 #define PREV_INSN(INSN) XEXP (INSN, 1)
 784 #define NEXT_INSN(INSN) XEXP (INSN, 2)
 785
 786 #define BLOCK_FOR_INSN(INSN) XBBDEF (INSN, 3)
 787
 788 /* The body of an insn.  */
 789 #define PATTERN(INSN)   XEXP (INSN, 4)
 790
 791 #define INSN_LOCATOR(INSN) XINT (INSN, 5)
 792 /* LOCATION of an RTX if relevant.  */
 793 #define RTL_LOCATION(X) (INSN_P (X) ? \
 794                          locator_location (INSN_LOCATOR (X)) \
 795                          : UNKNOWN_LOCATION)
 796 /* LOCATION of current INSN.  */
 797 #define CURR_INSN_LOCATION (locator_location (curr_insn_locator ()))
 798
 799 /* Code number of instruction, from when it was recognized.
 800    -1 means this instruction has not been recognized yet.  */
 801 #define INSN_CODE(INSN) XINT (INSN, 6)
 802
 803 #define RTX_FRAME_RELATED_P(RTX)                                        \
 804   (RTL_FLAG_CHECK6("RTX_FRAME_RELATED_P", (RTX), DEBUG_INSN, INSN,      \
 805                    CALL_INSN, JUMP_INSN, BARRIER, SET)->frame_related)
 806
 807 /* 1 if RTX is an insn that has been deleted.  */
 808 #define INSN_DELETED_P(RTX)                                             \
 809   (RTL_FLAG_CHECK7("INSN_DELETED_P", (RTX), DEBUG_INSN, INSN,           \
 810                    CALL_INSN, JUMP_INSN,                                \
 811                    CODE_LABEL, BARRIER, NOTE)->volatil)
 812
 813 /* 1 if RTX is a call to a const function.  Built from ECF_CONST and
 814    TREE_READONLY.  */
 815 #define RTL_CONST_CALL_P(RTX)                                   \
 816   (RTL_FLAG_CHECK1("RTL_CONST_CALL_P", (RTX), CALL_INSN)->unchanging)
 817
 818 /* 1 if RTX is a call to a pure function.  Built from ECF_PURE and
 819    DECL_PURE_P.  */
 820 #define RTL_PURE_CALL_P(RTX)                                    \
 821   (RTL_FLAG_CHECK1("RTL_PURE_CALL_P", (RTX), CALL_INSN)->return_val)
 822
 823 /* 1 if RTX is a call to a const or pure function.  */
 824 #define RTL_CONST_OR_PURE_CALL_P(RTX) \
 825   (RTL_CONST_CALL_P(RTX) || RTL_PURE_CALL_P(RTX))
 826
 827 /* 1 if RTX is a call to a looping const or pure function.  Built from
 828    ECF_LOOPING_CONST_OR_PURE and DECL_LOOPING_CONST_OR_PURE_P.  */
 829 #define RTL_LOOPING_CONST_OR_PURE_CALL_P(RTX)                                   \
 830   (RTL_FLAG_CHECK1("CONST_OR_PURE_CALL_P", (RTX), CALL_INSN)->call)
 831
 832 /* 1 if RTX is a call_insn for a sibling call.  */
 833 #define SIBLING_CALL_P(RTX)                                             \
 834   (RTL_FLAG_CHECK1("SIBLING_CALL_P", (RTX), CALL_INSN)->jump)
 835
 836 /* 1 if RTX is a jump_insn, call_insn, or insn that is an annulling branch.  */
 837 #define INSN_ANNULLED_BRANCH_P(RTX)                                     \
 838   (RTL_FLAG_CHECK1("INSN_ANNULLED_BRANCH_P", (RTX), JUMP_INSN)->unchanging)
 839
 840 /* 1 if RTX is an insn in a delay slot and is from the target of the branch.
 841    If the branch insn has INSN_ANNULLED_BRANCH_P set, this insn should only be
 842    executed if the branch is taken.  For annulled branches with this bit
 843    clear, the insn should be executed only if the branch is not taken.  */
 844 #define INSN_FROM_TARGET_P(RTX)                                         \
 845   (RTL_FLAG_CHECK3("INSN_FROM_TARGET_P", (RTX), INSN, JUMP_INSN, CALL_INSN)->in_struct)
 846
 847 /* In an ADDR_DIFF_VEC, the flags for RTX for use by branch shortening.
 848    See the comments for ADDR_DIFF_VEC in rtl.def.  */
 849 #define ADDR_DIFF_VEC_FLAGS(RTX) X0ADVFLAGS(RTX, 4)
 850
 851 /* In a VALUE, the value cselib has assigned to RTX.
 852    This is a "struct cselib_val_struct", see cselib.h.  */
 853 #define CSELIB_VAL_PTR(RTX) X0CSELIB(RTX, 0)
 854
 855 /* Holds a list of notes on what this insn does to various REGs.
 856    It is a chain of EXPR_LIST rtx's, where the second operand is the
 857    chain pointer and the first operand is the REG being described.
 858    The mode field of the EXPR_LIST contains not a real machine mode
 859    but a value from enum reg_note.  */
 860 #define REG_NOTES(INSN) XEXP(INSN, 7)
 861
 862 /* In an ENTRY_VALUE this is the DECL_INCOMING_RTL of the argument in
 863    question.  */
 864 #define ENTRY_VALUE_EXP(RTX) (RTL_CHECKC1 (RTX, 0, ENTRY_VALUE).rt_rtx)
 865
 866 enum reg_note
 867 {
 868 #define DEF_REG_NOTE(NAME) NAME,
 869 #include "reg-notes.def"
 870 #undef DEF_REG_NOTE
 871   REG_NOTE_MAX
 872 };
 873
 874 /* Define macros to extract and insert the reg-note kind in an EXPR_LIST.  */
 875 #define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
 876 #define PUT_REG_NOTE_KIND(LINK, KIND) \
 877   PUT_MODE (LINK, (enum machine_mode) (KIND))
 878
 879 /* Names for REG_NOTE's in EXPR_LIST insn's.  */
 880
 881 extern const char * const reg_note_name[];
 882 #define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int) (MODE)])
 883
 884 /* This field is only present on CALL_INSNs.  It holds a chain of EXPR_LIST of
 885    USE and CLOBBER expressions.
 886      USE expressions list the registers filled with arguments that
 887    are passed to the function.
 888      CLOBBER expressions document the registers explicitly clobbered
 889    by this CALL_INSN.
 890      Pseudo registers can not be mentioned in this list.  */
 891 #define CALL_INSN_FUNCTION_USAGE(INSN)  XEXP(INSN, 8)
 892
 893 /* The label-number of a code-label.  The assembler label
 894    is made from `L' and the label-number printed in decimal.
 895    Label numbers are unique in a compilation.  */
 896 #define CODE_LABEL_NUMBER(INSN) XINT (INSN, 6)
 897
 898 /* In a NOTE that is a line number, this is a string for the file name that the
 899    line is in.  We use the same field to record block numbers temporarily in
 900    NOTE_INSN_BLOCK_BEG and NOTE_INSN_BLOCK_END notes.  (We avoid lots of casts
 901    between ints and pointers if we use a different macro for the block number.)
 902    */
 903
 904 /* Opaque data.  */
 905 #define NOTE_DATA(INSN)         RTL_CHECKC1 (INSN, 4, NOTE)
 906 #define NOTE_DELETED_LABEL_NAME(INSN) XCSTR (INSN, 4, NOTE)
 907 #define SET_INSN_DELETED(INSN) set_insn_deleted (INSN);
 908 #define NOTE_BLOCK(INSN)        XCTREE (INSN, 4, NOTE)
 909 #define NOTE_EH_HANDLER(INSN)   XCINT (INSN, 4, NOTE)
 910 #define NOTE_BASIC_BLOCK(INSN)  XCBBDEF (INSN, 4, NOTE)
 911 #define NOTE_VAR_LOCATION(INSN) XCEXP (INSN, 4, NOTE)
 912 #define NOTE_CFI(INSN)          XCCFI (INSN, 4, NOTE)
 913 #define NOTE_LABEL_NUMBER(INSN) XCINT (INSN, 4, NOTE)
 914
 915 /* In a NOTE that is a line number, this is the line number.
 916    Other kinds of NOTEs are identified by negative numbers here.  */
 917 #define NOTE_KIND(INSN) XCINT (INSN, 5, NOTE)
 918
 919 /* Nonzero if INSN is a note marking the beginning of a basic block.  */
 920 #define NOTE_INSN_BASIC_BLOCK_P(INSN)                   \
 921   (GET_CODE (INSN) == NOTE                              \
 922    && NOTE_KIND (INSN) == NOTE_INSN_BASIC_BLOCK)
 923
 924 /* Variable declaration and the location of a variable.  */
 925 #define PAT_VAR_LOCATION_DECL(PAT) (XCTREE ((PAT), 0, VAR_LOCATION))
 926 #define PAT_VAR_LOCATION_LOC(PAT) (XCEXP ((PAT), 1, VAR_LOCATION))
 927
 928 /* Initialization status of the variable in the location.  Status
 929    can be unknown, uninitialized or initialized.  See enumeration
 930    type below.  */
 931 #define PAT_VAR_LOCATION_STATUS(PAT) \
 932   ((enum var_init_status) (XCINT ((PAT), 2, VAR_LOCATION)))
 933
 934 /* Accessors for a NOTE_INSN_VAR_LOCATION.  */
 935 #define NOTE_VAR_LOCATION_DECL(NOTE) \
 936   PAT_VAR_LOCATION_DECL (NOTE_VAR_LOCATION (NOTE))
 937 #define NOTE_VAR_LOCATION_LOC(NOTE) \
 938   PAT_VAR_LOCATION_LOC (NOTE_VAR_LOCATION (NOTE))
 939 #define NOTE_VAR_LOCATION_STATUS(NOTE) \
 940   PAT_VAR_LOCATION_STATUS (NOTE_VAR_LOCATION (NOTE))
 941
 942 /* The VAR_LOCATION rtx in a DEBUG_INSN.  */
 943 #define INSN_VAR_LOCATION(INSN) PATTERN (INSN)
 944
 945 /* Accessors for a tree-expanded var location debug insn.  */
 946 #define INSN_VAR_LOCATION_DECL(INSN) \
 947   PAT_VAR_LOCATION_DECL (INSN_VAR_LOCATION (INSN))
 948 #define INSN_VAR_LOCATION_LOC(INSN) \
 949   PAT_VAR_LOCATION_LOC (INSN_VAR_LOCATION (INSN))
 950 #define INSN_VAR_LOCATION_STATUS(INSN) \
 951   PAT_VAR_LOCATION_STATUS (INSN_VAR_LOCATION (INSN))
 952
 953 /* Expand to the RTL that denotes an unknown variable location in a
 954    DEBUG_INSN.  */
 955 #define gen_rtx_UNKNOWN_VAR_LOC() (gen_rtx_CLOBBER (VOIDmode, const0_rtx))
 956
 957 /* Determine whether X is such an unknown location.  */
 958 #define VAR_LOC_UNKNOWN_P(X) \
 959   (GET_CODE (X) == CLOBBER && XEXP ((X), 0) == const0_rtx)
 960
 961 /* 1 if RTX is emitted after a call, but it should take effect before
 962    the call returns.  */
 963 #define NOTE_DURING_CALL_P(RTX)                         \
 964   (RTL_FLAG_CHECK1("NOTE_VAR_LOCATION_DURING_CALL_P", (RTX), NOTE)->call)
 965
 966 /* DEBUG_EXPR_DECL corresponding to a DEBUG_EXPR RTX.  */
 967 #define DEBUG_EXPR_TREE_DECL(RTX) XCTREE (RTX, 0, DEBUG_EXPR)
 968
 969 /* VAR_DECL/PARM_DECL DEBUG_IMPLICIT_PTR takes address of.  */
 970 #define DEBUG_IMPLICIT_PTR_DECL(RTX) XCTREE (RTX, 0, DEBUG_IMPLICIT_PTR)
 971
 972 /* PARM_DECL DEBUG_PARAMETER_REF references.  */
 973 #define DEBUG_PARAMETER_REF_DECL(RTX) XCTREE (RTX, 0, DEBUG_PARAMETER_REF)
 974
 975 /* Codes that appear in the NOTE_KIND field for kinds of notes
 976    that are not line numbers.  These codes are all negative.
 977
 978    Notice that we do not try to use zero here for any of
 979    the special note codes because sometimes the source line
 980    actually can be zero!  This happens (for example) when we
 981    are generating code for the per-translation-unit constructor
 982    and destructor routines for some C++ translation unit.  */
 983
 984 enum insn_note
 985 {
 986 #define DEF_INSN_NOTE(NAME) NAME,
 987 #include "insn-notes.def"
 988 #undef DEF_INSN_NOTE
 989
 990   NOTE_INSN_MAX
 991 };
 992
 993 /* Names for NOTE insn's other than line numbers.  */
 994
 995 extern const char * const note_insn_name[NOTE_INSN_MAX];
 996 #define GET_NOTE_INSN_NAME(NOTE_CODE) \
 997   (note_insn_name[(NOTE_CODE)])
 998
 999 /* The name of a label, in case it corresponds to an explicit label
1000    in the input source code.  */
1001 #define LABEL_NAME(RTX) XCSTR (RTX, 7, CODE_LABEL)
1002
1003 /* In jump.c, each label contains a count of the number
1004    of LABEL_REFs that point at it, so unused labels can be deleted.  */
1005 #define LABEL_NUSES(RTX) XCINT (RTX, 5, CODE_LABEL)
1006
1007 /* Labels carry a two-bit field composed of the ->jump and ->call
1008    bits.  This field indicates whether the label is an alternate
1009    entry point, and if so, what kind.  */
1010 enum label_kind
1011 {
1012   LABEL_NORMAL = 0,     /* ordinary label */
1013   LABEL_STATIC_ENTRY,   /* alternate entry point, not exported */
1014   LABEL_GLOBAL_ENTRY,   /* alternate entry point, exported */
1015   LABEL_WEAK_ENTRY      /* alternate entry point, exported as weak symbol */
1016 };
1017
1018 #if defined ENABLE_RTL_FLAG_CHECKING && (GCC_VERSION > 2007)
1019
1020 /* Retrieve the kind of LABEL.  */
1021 #define LABEL_KIND(LABEL) __extension__                                 \
1022 ({ __typeof (LABEL) const _label = (LABEL);                             \
1023    if (GET_CODE (_label) != CODE_LABEL)                                 \
1024      rtl_check_failed_flag ("LABEL_KIND", _label, __FILE__, __LINE__,   \
1025                             __FUNCTION__);                              \
1026    (enum label_kind) ((_label->jump << 1) | _label->call); })
1027
1028 /* Set the kind of LABEL.  */
1029 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1030    __typeof (LABEL) const _label = (LABEL);                             \
1031    const unsigned int _kind = (KIND);                                   \
1032    if (GET_CODE (_label) != CODE_LABEL)                                 \
1033      rtl_check_failed_flag ("SET_LABEL_KIND", _label, __FILE__, __LINE__, \
1034                             __FUNCTION__);                              \
1035    _label->jump = ((_kind >> 1) & 1);                                   \
1036    _label->call = (_kind & 1);                                          \
1037 } while (0)
1038
1039 #else
1040
1041 /* Retrieve the kind of LABEL.  */
1042 #define LABEL_KIND(LABEL) \
1043    ((enum label_kind) (((LABEL)->jump << 1) | (LABEL)->call))
1044
1045 /* Set the kind of LABEL.  */
1046 #define SET_LABEL_KIND(LABEL, KIND) do {                                \
1047    rtx const _label = (LABEL);                                          \
1048    const unsigned int _kind = (KIND);                                   \
1049    _label->jump = ((_kind >> 1) & 1);                                   \
1050    _label->call = (_kind & 1);                                          \
1051 } while (0)
1052
1053 #endif /* rtl flag checking */
1054
1055 #define LABEL_ALT_ENTRY_P(LABEL) (LABEL_KIND (LABEL) != LABEL_NORMAL)
1056
1057 /* In jump.c, each JUMP_INSN can point to a label that it can jump to,
1058    so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
1059    be decremented and possibly the label can be deleted.  */
1060 #define JUMP_LABEL(INSN)   XCEXP (INSN, 8, JUMP_INSN)
1061
1062 /* Once basic blocks are found, each CODE_LABEL starts a chain that
1063    goes through all the LABEL_REFs that jump to that label.  The chain
1064    eventually winds up at the CODE_LABEL: it is circular.  */
1065 #define LABEL_REFS(LABEL) XCEXP (LABEL, 4, CODE_LABEL)
1066 \f
1067 /* For a REG rtx, REGNO extracts the register number.  REGNO can only
1068    be used on RHS.  Use SET_REGNO to change the value.  */
1069 #define REGNO(RTX) (rhs_regno(RTX))
1070 #define SET_REGNO(RTX,N) (df_ref_change_reg_with_loc (REGNO(RTX), N, RTX), XCUINT (RTX, 0, REG) = N)
1071 #define SET_REGNO_RAW(RTX,N) (XCUINT (RTX, 0, REG) = N)
1072
1073 /* ORIGINAL_REGNO holds the number the register originally had; for a
1074    pseudo register turned into a hard reg this will hold the old pseudo
1075    register number.  */
1076 #define ORIGINAL_REGNO(RTX) X0UINT (RTX, 1)
1077
1078 /* Force the REGNO macro to only be used on the lhs.  */
1079 static inline unsigned int
1080 rhs_regno (const_rtx x)
1081 {
1082   return XCUINT (x, 0, REG);
1083 }
1084
1085
1086 /* 1 if RTX is a reg or parallel that is the current function's return
1087    value.  */
1088 #define REG_FUNCTION_VALUE_P(RTX)                                       \
1089   (RTL_FLAG_CHECK2("REG_FUNCTION_VALUE_P", (RTX), REG, PARALLEL)->return_val)
1090
1091 /* 1 if RTX is a reg that corresponds to a variable declared by the user.  */
1092 #define REG_USERVAR_P(RTX)                                              \
1093   (RTL_FLAG_CHECK1("REG_USERVAR_P", (RTX), REG)->volatil)
1094
1095 /* 1 if RTX is a reg that holds a pointer value.  */
1096 #define REG_POINTER(RTX)                                                \
1097   (RTL_FLAG_CHECK1("REG_POINTER", (RTX), REG)->frame_related)
1098
1099 /* 1 if RTX is a mem that holds a pointer value.  */
1100 #define MEM_POINTER(RTX)                                                \
1101   (RTL_FLAG_CHECK1("MEM_POINTER", (RTX), MEM)->frame_related)
1102
1103 /* 1 if the given register REG corresponds to a hard register.  */
1104 #define HARD_REGISTER_P(REG) (HARD_REGISTER_NUM_P (REGNO (REG)))
1105
1106 /* 1 if the given register number REG_NO corresponds to a hard register.  */
1107 #define HARD_REGISTER_NUM_P(REG_NO) ((REG_NO) < FIRST_PSEUDO_REGISTER)
1108
1109 /* For a CONST_INT rtx, INTVAL extracts the integer.  */
1110 #define INTVAL(RTX) XCWINT(RTX, 0, CONST_INT)
1111 #define UINTVAL(RTX) ((unsigned HOST_WIDE_INT) INTVAL (RTX))
1112
1113 /* For a CONST_DOUBLE:
1114    For a VOIDmode, there are two integers CONST_DOUBLE_LOW is the
1115      low-order word and ..._HIGH the high-order.
1116    For a float, there is a REAL_VALUE_TYPE structure, and
1117      CONST_DOUBLE_REAL_VALUE(r) is a pointer to it.  */
1118 #define CONST_DOUBLE_LOW(r) XCMWINT (r, 0, CONST_DOUBLE, VOIDmode)
1119 #define CONST_DOUBLE_HIGH(r) XCMWINT (r, 1, CONST_DOUBLE, VOIDmode)
1120 #define CONST_DOUBLE_REAL_VALUE(r) \
1121   ((const struct real_value *) XCNMPRV (r, CONST_DOUBLE, VOIDmode))
1122
1123 #define CONST_FIXED_VALUE(r) \
1124   ((const struct fixed_value *) XCNMPFV (r, CONST_FIXED, VOIDmode))
1125 #define CONST_FIXED_VALUE_HIGH(r) \
1126   ((HOST_WIDE_INT) (CONST_FIXED_VALUE(r)->data.high))
1127 #define CONST_FIXED_VALUE_LOW(r) \
1128   ((HOST_WIDE_INT) (CONST_FIXED_VALUE(r)->data.low))
1129
1130 /* For a CONST_VECTOR, return element #n.  */
1131 #define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR)
1132
1133 /* For a CONST_VECTOR, return the number of elements in a vector.  */
1134 #define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR)
1135
1136 /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
1137    SUBREG_BYTE extracts the byte-number.  */
1138
1139 #define SUBREG_REG(RTX) XCEXP (RTX, 0, SUBREG)
1140 #define SUBREG_BYTE(RTX) XCUINT (RTX, 1, SUBREG)
1141
1142 /* in rtlanal.c */
1143 /* Return the right cost to give to an operation
1144    to make the cost of the corresponding register-to-register instruction
1145    N times that of a fast register-to-register instruction.  */
1146 #define COSTS_N_INSNS(N) ((N) * 4)
1147
1148 /* Maximum cost of an rtl expression.  This value has the special meaning
1149    not to use an rtx with this cost under any circumstances.  */
1150 #define MAX_COST INT_MAX
1151
1152 /* A structure to hold all available cost information about an rtl
1153    expression.  */
1154 struct full_rtx_costs
1155 {
1156   int speed;
1157   int size;
1158 };
1159
1160 /* Initialize a full_rtx_costs structure C to the maximum cost.  */
1161 static inline void
1162 init_costs_to_max (struct full_rtx_costs *c)
1163 {
1164   c->speed = MAX_COST;
1165   c->size = MAX_COST;
1166 }
1167
1168 /* Initialize a full_rtx_costs structure C to zero cost.  */
1169 static inline void
1170 init_costs_to_zero (struct full_rtx_costs *c)
1171 {
1172   c->speed = 0;
1173   c->size = 0;
1174 }
1175
1176 /* Compare two full_rtx_costs structures A and B, returning true
1177    if A < B when optimizing for speed.  */
1178 static inline bool
1179 costs_lt_p (struct full_rtx_costs *a, struct full_rtx_costs *b,
1180             bool speed)
1181 {
1182   if (speed)
1183     return (a->speed < b->speed
1184             || (a->speed == b->speed && a->size < b->size));
1185   else
1186     return (a->size < b->size
1187             || (a->size == b->size && a->speed < b->speed));
1188 }
1189
1190 /* Increase both members of the full_rtx_costs structure C by the
1191    cost of N insns.  */
1192 static inline void
1193 costs_add_n_insns (struct full_rtx_costs *c, int n)
1194 {
1195   c->speed += COSTS_N_INSNS (n);
1196   c->size += COSTS_N_INSNS (n);
1197 }
1198
1199 extern void init_rtlanal (void);
1200 extern int rtx_cost (rtx, enum rtx_code, int, bool);
1201 extern int address_cost (rtx, enum machine_mode, addr_space_t, bool);
1202 extern void get_full_rtx_cost (rtx, enum rtx_code, int,
1203                                struct full_rtx_costs *);
1204 extern unsigned int subreg_lsb (const_rtx);
1205 extern unsigned int subreg_lsb_1 (enum machine_mode, enum machine_mode,
1206                                   unsigned int);
1207 extern unsigned int subreg_regno_offset (unsigned int, enum machine_mode,
1208                                          unsigned int, enum machine_mode);
1209 extern bool subreg_offset_representable_p (unsigned int, enum machine_mode,
1210                                            unsigned int, enum machine_mode);
1211 extern unsigned int subreg_regno (const_rtx);
1212 extern int simplify_subreg_regno (unsigned int, enum machine_mode,
1213                                   unsigned int, enum machine_mode);
1214 extern unsigned int subreg_nregs (const_rtx);
1215 extern unsigned int subreg_nregs_with_regno (unsigned int, const_rtx);
1216 extern unsigned HOST_WIDE_INT nonzero_bits (const_rtx, enum machine_mode);
1217 extern unsigned int num_sign_bit_copies (const_rtx, enum machine_mode);
1218 extern bool constant_pool_constant_p (rtx);
1219 extern bool truncated_to_mode (enum machine_mode, const_rtx);
1220 extern int low_bitmask_len (enum machine_mode, unsigned HOST_WIDE_INT);
1221
1222 #ifndef GENERATOR_FILE
1223 /* Return the cost of SET X.  SPEED_P is true if optimizing for speed
1224    rather than size.  */
1225
1226 static inline int
1227 set_rtx_cost (rtx x, bool speed_p)
1228 {
1229   return rtx_cost (x, INSN, 4, speed_p);
1230 }
1231
1232 /* Like set_rtx_cost, but return both the speed and size costs in C.  */
1233
1234 static inline void
1235 get_full_set_rtx_cost (rtx x, struct full_rtx_costs *c)
1236 {
1237   get_full_rtx_cost (x, INSN, 4, c);
1238 }
1239
1240 /* Return the cost of moving X into a register, relative to the cost
1241    of a register move.  SPEED_P is true if optimizing for speed rather
1242    than size.  */
1243
1244 static inline int
1245 set_src_cost (rtx x, bool speed_p)
1246 {
1247   return rtx_cost (x, SET, 1, speed_p);
1248 }
1249
1250 /* Like set_src_cost, but return both the speed and size costs in C.  */
1251
1252 static inline void
1253 get_full_set_src_cost (rtx x, struct full_rtx_costs *c)
1254 {
1255   get_full_rtx_cost (x, SET, 1, c);
1256 }
1257 #endif
1258
1259 /* 1 if RTX is a subreg containing a reg that is already known to be
1260    sign- or zero-extended from the mode of the subreg to the mode of
1261    the reg.  SUBREG_PROMOTED_UNSIGNED_P gives the signedness of the
1262    extension.
1263
1264    When used as a LHS, is means that this extension must be done
1265    when assigning to SUBREG_REG.  */
1266
1267 #define SUBREG_PROMOTED_VAR_P(RTX)                                      \
1268   (RTL_FLAG_CHECK1("SUBREG_PROMOTED", (RTX), SUBREG)->in_struct)
1269
1270 #define SUBREG_PROMOTED_UNSIGNED_SET(RTX, VAL)                          \
1271 do {                                                                    \
1272   rtx const _rtx = RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_SET", (RTX), SUBREG); \
1273   if ((VAL) < 0)                                                        \
1274     _rtx->volatil = 1;                                                  \
1275   else {                                                                \
1276     _rtx->volatil = 0;                                                  \
1277     _rtx->unchanging = (VAL);                                           \
1278   }                                                                     \
1279 } while (0)
1280
1281 /* Valid for subregs which are SUBREG_PROMOTED_VAR_P().  In that case
1282    this gives the necessary extensions:
1283    0  - signed
1284    1  - normal unsigned
1285    -1 - pointer unsigned, which most often can be handled like unsigned
1286         extension, except for generating instructions where we need to
1287         emit special code (ptr_extend insns) on some architectures.  */
1288
1289 #define SUBREG_PROMOTED_UNSIGNED_P(RTX) \
1290   ((RTL_FLAG_CHECK1("SUBREG_PROMOTED_UNSIGNED_P", (RTX), SUBREG)->volatil) \
1291    ? -1 : (int) (RTX)->unchanging)
1292
1293 /* Access various components of an ASM_OPERANDS rtx.  */
1294
1295 #define ASM_OPERANDS_TEMPLATE(RTX) XCSTR (RTX, 0, ASM_OPERANDS)
1296 #define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XCSTR (RTX, 1, ASM_OPERANDS)
1297 #define ASM_OPERANDS_OUTPUT_IDX(RTX) XCINT (RTX, 2, ASM_OPERANDS)
1298 #define ASM_OPERANDS_INPUT_VEC(RTX) XCVEC (RTX, 3, ASM_OPERANDS)
1299 #define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XCVEC (RTX, 4, ASM_OPERANDS)
1300 #define ASM_OPERANDS_INPUT(RTX, N) XCVECEXP (RTX, 3, N, ASM_OPERANDS)
1301 #define ASM_OPERANDS_INPUT_LENGTH(RTX) XCVECLEN (RTX, 3, ASM_OPERANDS)
1302 #define ASM_OPERANDS_INPUT_CONSTRAINT_EXP(RTX, N) \
1303   XCVECEXP (RTX, 4, N, ASM_OPERANDS)
1304 #define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) \
1305   XSTR (XCVECEXP (RTX, 4, N, ASM_OPERANDS), 0)
1306 #define ASM_OPERANDS_INPUT_MODE(RTX, N)  \
1307   GET_MODE (XCVECEXP (RTX, 4, N, ASM_OPERANDS))
1308 #define ASM_OPERANDS_LABEL_VEC(RTX) XCVEC (RTX, 5, ASM_OPERANDS)
1309 #define ASM_OPERANDS_LABEL_LENGTH(RTX) XCVECLEN (RTX, 5, ASM_OPERANDS)
1310 #define ASM_OPERANDS_LABEL(RTX, N) XCVECEXP (RTX, 5, N, ASM_OPERANDS)
1311 #define ASM_OPERANDS_SOURCE_LOCATION(RTX) XCUINT (RTX, 6, ASM_OPERANDS)
1312 #define ASM_INPUT_SOURCE_LOCATION(RTX) XCUINT (RTX, 1, ASM_INPUT)
1313
1314 /* 1 if RTX is a mem that is statically allocated in read-only memory.  */
1315 #define MEM_READONLY_P(RTX) \
1316   (RTL_FLAG_CHECK1("MEM_READONLY_P", (RTX), MEM)->unchanging)
1317
1318 /* 1 if RTX is a mem and we should keep the alias set for this mem
1319    unchanged when we access a component.  Set to 1, or example, when we
1320    are already in a non-addressable component of an aggregate.  */
1321 #define MEM_KEEP_ALIAS_SET_P(RTX)                                       \
1322   (RTL_FLAG_CHECK1("MEM_KEEP_ALIAS_SET_P", (RTX), MEM)->jump)
1323
1324 /* 1 if RTX is a mem or asm_operand for a volatile reference.  */
1325 #define MEM_VOLATILE_P(RTX)                                             \
1326   (RTL_FLAG_CHECK3("MEM_VOLATILE_P", (RTX), MEM, ASM_OPERANDS,          \
1327                    ASM_INPUT)->volatil)
1328
1329 /* 1 if RTX is a mem that refers to an aggregate, either to the
1330    aggregate itself or to a field of the aggregate.  If zero, RTX may
1331    or may not be such a reference.  */
1332 #define MEM_IN_STRUCT_P(RTX)                                            \
1333   (RTL_FLAG_CHECK1("MEM_IN_STRUCT_P", (RTX), MEM)->in_struct)
1334
1335 /* 1 if RTX is a MEM that refers to a scalar.  If zero, RTX may or may
1336    not refer to a scalar.  */
1337 #define MEM_SCALAR_P(RTX)                                               \
1338   (RTL_FLAG_CHECK1("MEM_SCALAR_P", (RTX), MEM)->return_val)
1339
1340 /* 1 if RTX is a mem that cannot trap.  */
1341 #define MEM_NOTRAP_P(RTX) \
1342   (RTL_FLAG_CHECK1("MEM_NOTRAP_P", (RTX), MEM)->call)
1343
1344 /* The memory attribute block.  We provide access macros for each value
1345    in the block and provide defaults if none specified.  */
1346 #define MEM_ATTRS(RTX) X0MEMATTR (RTX, 1)
1347
1348 /* The register attribute block.  We provide access macros for each value
1349    in the block and provide defaults if none specified.  */
1350 #define REG_ATTRS(RTX) X0REGATTR (RTX, 2)
1351
1352 #ifndef GENERATOR_FILE
1353 /* For a MEM rtx, the alias set.  If 0, this MEM is not in any alias
1354    set, and may alias anything.  Otherwise, the MEM can only alias
1355    MEMs in a conflicting alias set.  This value is set in a
1356    language-dependent manner in the front-end, and should not be
1357    altered in the back-end.  These set numbers are tested with
1358    alias_sets_conflict_p.  */
1359 #define MEM_ALIAS_SET(RTX) (get_mem_attrs (RTX)->alias)
1360
1361 /* For a MEM rtx, the decl it is known to refer to, if it is known to
1362    refer to part of a DECL.  It may also be a COMPONENT_REF.  */
1363 #define MEM_EXPR(RTX) (get_mem_attrs (RTX)->expr)
1364
1365 /* For a MEM rtx, true if its MEM_OFFSET is known.  */
1366 #define MEM_OFFSET_KNOWN_P(RTX) (get_mem_attrs (RTX)->offset_known_p)
1367
1368 /* For a MEM rtx, the offset from the start of MEM_EXPR.  */
1369 #define MEM_OFFSET(RTX) (get_mem_attrs (RTX)->offset)
1370
1371 /* For a MEM rtx, the address space.  */
1372 #define MEM_ADDR_SPACE(RTX) (get_mem_attrs (RTX)->addrspace)
1373
1374 /* For a MEM rtx, true if its MEM_SIZE is known.  */
1375 #define MEM_SIZE_KNOWN_P(RTX) (get_mem_attrs (RTX)->size_known_p)
1376
1377 /* For a MEM rtx, the size in bytes of the MEM.  */
1378 #define MEM_SIZE(RTX) (get_mem_attrs (RTX)->size)
1379
1380 /* For a MEM rtx, the alignment in bits.  We can use the alignment of the
1381    mode as a default when STRICT_ALIGNMENT, but not if not.  */
1382 #define MEM_ALIGN(RTX) (get_mem_attrs (RTX)->align)
1383 #else
1384 #define MEM_ADDR_SPACE(RTX) ADDR_SPACE_GENERIC
1385 #endif
1386
1387 /* For a REG rtx, the decl it is known to refer to, if it is known to
1388    refer to part of a DECL.  */
1389 #define REG_EXPR(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->decl)
1390
1391 /* For a REG rtx, the offset from the start of REG_EXPR, if known, as an
1392    HOST_WIDE_INT.  */
1393 #define REG_OFFSET(RTX) (REG_ATTRS (RTX) == 0 ? 0 : REG_ATTRS (RTX)->offset)
1394
1395 /* Copy the attributes that apply to memory locations from RHS to LHS.  */
1396 #define MEM_COPY_ATTRIBUTES(LHS, RHS)                           \
1397   (MEM_VOLATILE_P (LHS) = MEM_VOLATILE_P (RHS),                 \
1398    MEM_IN_STRUCT_P (LHS) = MEM_IN_STRUCT_P (RHS),               \
1399    MEM_SCALAR_P (LHS) = MEM_SCALAR_P (RHS),                     \
1400    MEM_NOTRAP_P (LHS) = MEM_NOTRAP_P (RHS),                     \
1401    MEM_READONLY_P (LHS) = MEM_READONLY_P (RHS),                 \
1402    MEM_KEEP_ALIAS_SET_P (LHS) = MEM_KEEP_ALIAS_SET_P (RHS),     \
1403    MEM_POINTER (LHS) = MEM_POINTER (RHS),                       \
1404    MEM_ATTRS (LHS) = MEM_ATTRS (RHS))
1405
1406 /* 1 if RTX is a label_ref for a nonlocal label.  */
1407 /* Likewise in an expr_list for a REG_LABEL_OPERAND or
1408    REG_LABEL_TARGET note.  */
1409 #define LABEL_REF_NONLOCAL_P(RTX)                                       \
1410   (RTL_FLAG_CHECK1("LABEL_REF_NONLOCAL_P", (RTX), LABEL_REF)->volatil)
1411
1412 /* 1 if RTX is a code_label that should always be considered to be needed.  */
1413 #define LABEL_PRESERVE_P(RTX)                                           \
1414   (RTL_FLAG_CHECK2("LABEL_PRESERVE_P", (RTX), CODE_LABEL, NOTE)->in_struct)
1415
1416 /* During sched, 1 if RTX is an insn that must be scheduled together
1417    with the preceding insn.  */
1418 #define SCHED_GROUP_P(RTX)                                              \
1419   (RTL_FLAG_CHECK4("SCHED_GROUP_P", (RTX), DEBUG_INSN, INSN,            \
1420                    JUMP_INSN, CALL_INSN                                 \
1421                    )->in_struct)
1422
1423 /* For a SET rtx, SET_DEST is the place that is set
1424    and SET_SRC is the value it is set to.  */
1425 #define SET_DEST(RTX) XC2EXP(RTX, 0, SET, CLOBBER)
1426 #define SET_SRC(RTX) XCEXP(RTX, 1, SET)
1427 #define SET_IS_RETURN_P(RTX)                                            \
1428   (RTL_FLAG_CHECK1("SET_IS_RETURN_P", (RTX), SET)->jump)
1429
1430 /* For a TRAP_IF rtx, TRAP_CONDITION is an expression.  */
1431 #define TRAP_CONDITION(RTX) XCEXP (RTX, 0, TRAP_IF)
1432 #define TRAP_CODE(RTX) XCEXP (RTX, 1, TRAP_IF)
1433
1434 /* For a COND_EXEC rtx, COND_EXEC_TEST is the condition to base
1435    conditionally executing the code on, COND_EXEC_CODE is the code
1436    to execute if the condition is true.  */
1437 #define COND_EXEC_TEST(RTX) XCEXP (RTX, 0, COND_EXEC)
1438 #define COND_EXEC_CODE(RTX) XCEXP (RTX, 1, COND_EXEC)
1439
1440 /* 1 if RTX is a symbol_ref that addresses this function's rtl
1441    constants pool.  */
1442 #define CONSTANT_POOL_ADDRESS_P(RTX)                                    \
1443   (RTL_FLAG_CHECK1("CONSTANT_POOL_ADDRESS_P", (RTX), SYMBOL_REF)->unchanging)
1444
1445 /* 1 if RTX is a symbol_ref that addresses a value in the file's
1446    tree constant pool.  This information is private to varasm.c.  */
1447 #define TREE_CONSTANT_POOL_ADDRESS_P(RTX)                               \
1448   (RTL_FLAG_CHECK1("TREE_CONSTANT_POOL_ADDRESS_P",                      \
1449                    (RTX), SYMBOL_REF)->frame_related)
1450
1451 /* Used if RTX is a symbol_ref, for machine-specific purposes.  */
1452 #define SYMBOL_REF_FLAG(RTX)                                            \
1453   (RTL_FLAG_CHECK1("SYMBOL_REF_FLAG", (RTX), SYMBOL_REF)->volatil)
1454
1455 /* 1 if RTX is a symbol_ref that has been the library function in
1456    emit_library_call.  */
1457 #define SYMBOL_REF_USED(RTX)                                            \
1458   (RTL_FLAG_CHECK1("SYMBOL_REF_USED", (RTX), SYMBOL_REF)->used)
1459
1460 /* 1 if RTX is a symbol_ref for a weak symbol.  */
1461 #define SYMBOL_REF_WEAK(RTX)                                            \
1462   (RTL_FLAG_CHECK1("SYMBOL_REF_WEAK", (RTX), SYMBOL_REF)->return_val)
1463
1464 /* A pointer attached to the SYMBOL_REF; either SYMBOL_REF_DECL or
1465    SYMBOL_REF_CONSTANT.  */
1466 #define SYMBOL_REF_DATA(RTX) X0ANY ((RTX), 2)
1467
1468 /* Set RTX's SYMBOL_REF_DECL to DECL.  RTX must not be a constant
1469    pool symbol.  */
1470 #define SET_SYMBOL_REF_DECL(RTX, DECL) \
1471   (gcc_assert (!CONSTANT_POOL_ADDRESS_P (RTX)), X0TREE ((RTX), 2) = (DECL))
1472
1473 /* The tree (decl or constant) associated with the symbol, or null.  */
1474 #define SYMBOL_REF_DECL(RTX) \
1475   (CONSTANT_POOL_ADDRESS_P (RTX) ? NULL : X0TREE ((RTX), 2))
1476
1477 /* Set RTX's SYMBOL_REF_CONSTANT to C.  RTX must be a constant pool symbol.  */
1478 #define SET_SYMBOL_REF_CONSTANT(RTX, C) \
1479   (gcc_assert (CONSTANT_POOL_ADDRESS_P (RTX)), X0CONSTANT ((RTX), 2) = (C))
1480
1481 /* The rtx constant pool entry for a symbol, or null.  */
1482 #define SYMBOL_REF_CONSTANT(RTX) \
1483   (CONSTANT_POOL_ADDRESS_P (RTX) ? X0CONSTANT ((RTX), 2) : NULL)
1484
1485 /* A set of flags on a symbol_ref that are, in some respects, redundant with
1486    information derivable from the tree decl associated with this symbol.
1487    Except that we build a *lot* of SYMBOL_REFs that aren't associated with a
1488    decl.  In some cases this is a bug.  But beyond that, it's nice to cache
1489    this information to avoid recomputing it.  Finally, this allows space for
1490    the target to store more than one bit of information, as with
1491    SYMBOL_REF_FLAG.  */
1492 #define SYMBOL_REF_FLAGS(RTX)   X0INT ((RTX), 1)
1493
1494 /* These flags are common enough to be defined for all targets.  They
1495    are computed by the default version of targetm.encode_section_info.  */
1496
1497 /* Set if this symbol is a function.  */
1498 #define SYMBOL_FLAG_FUNCTION    (1 << 0)
1499 #define SYMBOL_REF_FUNCTION_P(RTX) \
1500   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_FUNCTION) != 0)
1501 /* Set if targetm.binds_local_p is true.  */
1502 #define SYMBOL_FLAG_LOCAL       (1 << 1)
1503 #define SYMBOL_REF_LOCAL_P(RTX) \
1504   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_LOCAL) != 0)
1505 /* Set if targetm.in_small_data_p is true.  */
1506 #define SYMBOL_FLAG_SMALL       (1 << 2)
1507 #define SYMBOL_REF_SMALL_P(RTX) \
1508   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_SMALL) != 0)
1509 /* The three-bit field at [5:3] is true for TLS variables; use
1510    SYMBOL_REF_TLS_MODEL to extract the field as an enum tls_model.  */
1511 #define SYMBOL_FLAG_TLS_SHIFT   3
1512 #define SYMBOL_REF_TLS_MODEL(RTX) \
1513   ((enum tls_model) ((SYMBOL_REF_FLAGS (RTX) >> SYMBOL_FLAG_TLS_SHIFT) & 7))
1514 /* Set if this symbol is not defined in this translation unit.  */
1515 #define SYMBOL_FLAG_EXTERNAL    (1 << 6)
1516 #define SYMBOL_REF_EXTERNAL_P(RTX) \
1517   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_EXTERNAL) != 0)
1518 /* Set if this symbol has a block_symbol structure associated with it.  */
1519 #define SYMBOL_FLAG_HAS_BLOCK_INFO (1 << 7)
1520 #define SYMBOL_REF_HAS_BLOCK_INFO_P(RTX) \
1521   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_HAS_BLOCK_INFO) != 0)
1522 /* Set if this symbol is a section anchor.  SYMBOL_REF_ANCHOR_P implies
1523    SYMBOL_REF_HAS_BLOCK_INFO_P.  */
1524 #define SYMBOL_FLAG_ANCHOR      (1 << 8)
1525 #define SYMBOL_REF_ANCHOR_P(RTX) \
1526   ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_ANCHOR) != 0)
1527
1528 /* Subsequent bits are available for the target to use.  */
1529 #define SYMBOL_FLAG_MACH_DEP_SHIFT      9
1530 #define SYMBOL_FLAG_MACH_DEP            (1 << SYMBOL_FLAG_MACH_DEP_SHIFT)
1531
1532 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the object_block
1533    structure to which the symbol belongs, or NULL if it has not been
1534    assigned a block.  */
1535 #define SYMBOL_REF_BLOCK(RTX) (BLOCK_SYMBOL_CHECK (RTX)->block)
1536
1537 /* If SYMBOL_REF_HAS_BLOCK_INFO_P (RTX), this is the offset of RTX from
1538    the first object in SYMBOL_REF_BLOCK (RTX).  The value is negative if
1539    RTX has not yet been assigned to a block, or it has not been given an
1540    offset within that block.  */
1541 #define SYMBOL_REF_BLOCK_OFFSET(RTX) (BLOCK_SYMBOL_CHECK (RTX)->offset)
1542
1543 /* True if RTX is flagged to be a scheduling barrier.  */
1544 #define PREFETCH_SCHEDULE_BARRIER_P(RTX)                                        \
1545   (RTL_FLAG_CHECK1("PREFETCH_SCHEDULE_BARRIER_P", (RTX), PREFETCH)->volatil)
1546
1547 /* Indicate whether the machine has any sort of auto increment addressing.
1548    If not, we can avoid checking for REG_INC notes.  */
1549
1550 #if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
1551      || defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT) \
1552      || defined (HAVE_PRE_MODIFY_DISP) || defined (HAVE_PRE_MODIFY_DISP) \
1553      || defined (HAVE_PRE_MODIFY_REG) || defined (HAVE_POST_MODIFY_REG))
1554 #define AUTO_INC_DEC
1555 #endif
1556
1557 /* Define a macro to look for REG_INC notes,
1558    but save time on machines where they never exist.  */
1559
1560 #ifdef AUTO_INC_DEC
1561 #define FIND_REG_INC_NOTE(INSN, REG)                    \
1562   ((REG) != NULL_RTX && REG_P ((REG))                   \
1563    ? find_regno_note ((INSN), REG_INC, REGNO (REG))     \
1564    : find_reg_note ((INSN), REG_INC, (REG)))
1565 #else
1566 #define FIND_REG_INC_NOTE(INSN, REG) 0
1567 #endif
1568
1569 #ifndef HAVE_PRE_INCREMENT
1570 #define HAVE_PRE_INCREMENT 0
1571 #endif
1572
1573 #ifndef HAVE_PRE_DECREMENT
1574 #define HAVE_PRE_DECREMENT 0
1575 #endif
1576
1577 #ifndef HAVE_POST_INCREMENT
1578 #define HAVE_POST_INCREMENT 0
1579 #endif
1580
1581 #ifndef HAVE_POST_DECREMENT
1582 #define HAVE_POST_DECREMENT 0
1583 #endif
1584
1585 #ifndef HAVE_POST_MODIFY_DISP
1586 #define HAVE_POST_MODIFY_DISP 0
1587 #endif
1588
1589 #ifndef HAVE_POST_MODIFY_REG
1590 #define HAVE_POST_MODIFY_REG 0
1591 #endif
1592
1593 #ifndef HAVE_PRE_MODIFY_DISP
1594 #define HAVE_PRE_MODIFY_DISP 0
1595 #endif
1596
1597 #ifndef HAVE_PRE_MODIFY_REG
1598 #define HAVE_PRE_MODIFY_REG 0
1599 #endif
1600
1601
1602 /* Some architectures do not have complete pre/post increment/decrement
1603    instruction sets, or only move some modes efficiently.  These macros
1604    allow us to tune autoincrement generation.  */
1605
1606 #ifndef USE_LOAD_POST_INCREMENT
1607 #define USE_LOAD_POST_INCREMENT(MODE)   HAVE_POST_INCREMENT
1608 #endif
1609
1610 #ifndef USE_LOAD_POST_DECREMENT
1611 #define USE_LOAD_POST_DECREMENT(MODE)   HAVE_POST_DECREMENT
1612 #endif
1613
1614 #ifndef USE_LOAD_PRE_INCREMENT
1615 #define USE_LOAD_PRE_INCREMENT(MODE)    HAVE_PRE_INCREMENT
1616 #endif
1617
1618 #ifndef USE_LOAD_PRE_DECREMENT
1619 #define USE_LOAD_PRE_DECREMENT(MODE)    HAVE_PRE_DECREMENT
1620 #endif
1621
1622 #ifndef USE_STORE_POST_INCREMENT
1623 #define USE_STORE_POST_INCREMENT(MODE)  HAVE_POST_INCREMENT
1624 #endif
1625
1626 #ifndef USE_STORE_POST_DECREMENT
1627 #define USE_STORE_POST_DECREMENT(MODE)  HAVE_POST_DECREMENT
1628 #endif
1629
1630 #ifndef USE_STORE_PRE_INCREMENT
1631 #define USE_STORE_PRE_INCREMENT(MODE)   HAVE_PRE_INCREMENT
1632 #endif
1633
1634 #ifndef USE_STORE_PRE_DECREMENT
1635 #define USE_STORE_PRE_DECREMENT(MODE)   HAVE_PRE_DECREMENT
1636 #endif
1637 \f
1638 /* Nonzero when we are generating CONCATs.  */
1639 extern int generating_concat_p;
1640
1641 /* Nonzero when we are expanding trees to RTL.  */
1642 extern int currently_expanding_to_rtl;
1643
1644 /* Generally useful functions.  */
1645
1646 /* In expmed.c */
1647 extern int ceil_log2 (unsigned HOST_WIDE_INT);
1648
1649 /* In explow.c */
1650 extern HOST_WIDE_INT trunc_int_for_mode (HOST_WIDE_INT, enum machine_mode);
1651 extern rtx plus_constant (rtx, HOST_WIDE_INT);
1652
1653 /* In rtl.c */
1654 extern rtx rtx_alloc_stat (RTX_CODE MEM_STAT_DECL);
1655 #define rtx_alloc(c) rtx_alloc_stat (c MEM_STAT_INFO)
1656
1657 extern rtvec rtvec_alloc (int);
1658 extern rtvec shallow_copy_rtvec (rtvec);
1659 extern bool shared_const_p (const_rtx);
1660 extern rtx copy_rtx (rtx);
1661 extern void dump_rtx_statistics (void);
1662
1663 /* In emit-rtl.c */
1664 extern rtx copy_rtx_if_shared (rtx);
1665
1666 /* In rtl.c */
1667 extern unsigned int rtx_size (const_rtx);
1668 extern rtx shallow_copy_rtx_stat (const_rtx MEM_STAT_DECL);
1669 #define shallow_copy_rtx(a) shallow_copy_rtx_stat (a MEM_STAT_INFO)
1670 extern int rtx_equal_p (const_rtx, const_rtx);
1671 extern hashval_t iterative_hash_rtx (const_rtx, hashval_t);
1672
1673 /* In emit-rtl.c */
1674 extern rtvec gen_rtvec_v (int, rtx *);
1675 extern rtx gen_reg_rtx (enum machine_mode);
1676 extern rtx gen_rtx_REG_offset (rtx, enum machine_mode, unsigned int, int);
1677 extern rtx gen_reg_rtx_offset (rtx, enum machine_mode, int);
1678 extern rtx gen_reg_rtx_and_attrs (rtx);
1679 extern rtx gen_label_rtx (void);
1680 extern rtx gen_lowpart_common (enum machine_mode, rtx);
1681
1682 /* In cse.c */
1683 extern rtx gen_lowpart_if_possible (enum machine_mode, rtx);
1684
1685 /* In emit-rtl.c */
1686 extern rtx gen_highpart (enum machine_mode, rtx);
1687 extern rtx gen_highpart_mode (enum machine_mode, enum machine_mode, rtx);
1688 extern rtx operand_subword (rtx, unsigned int, int, enum machine_mode);
1689
1690 /* In emit-rtl.c */
1691 extern rtx operand_subword_force (rtx, unsigned int, enum machine_mode);
1692 extern bool paradoxical_subreg_p (const_rtx);
1693 extern int subreg_lowpart_p (const_rtx);
1694 extern unsigned int subreg_lowpart_offset (enum machine_mode,
1695                                            enum machine_mode);
1696 extern unsigned int subreg_highpart_offset (enum machine_mode,
1697                                             enum machine_mode);
1698 extern int byte_lowpart_offset (enum machine_mode, enum machine_mode);
1699 extern rtx make_safe_from (rtx, rtx);
1700 extern rtx convert_memory_address_addr_space (enum machine_mode, rtx,
1701                                               addr_space_t);
1702 #define convert_memory_address(to_mode,x) \
1703         convert_memory_address_addr_space ((to_mode), (x), ADDR_SPACE_GENERIC)
1704 extern const char *get_insn_name (int);
1705 extern rtx get_last_insn_anywhere (void);
1706 extern rtx get_first_nonnote_insn (void);
1707 extern rtx get_last_nonnote_insn (void);
1708 extern void start_sequence (void);
1709 extern void push_to_sequence (rtx);
1710 extern void push_to_sequence2 (rtx, rtx);
1711 extern void end_sequence (void);
1712 extern double_int rtx_to_double_int (const_rtx);
1713 extern rtx immed_double_int_const (double_int, enum machine_mode);
1714 extern rtx immed_double_const (HOST_WIDE_INT, HOST_WIDE_INT,
1715                                enum machine_mode);
1716
1717 /* In loop-iv.c  */
1718
1719 extern rtx lowpart_subreg (enum machine_mode, rtx, enum machine_mode);
1720
1721 /* In varasm.c  */
1722 extern rtx force_const_mem (enum machine_mode, rtx);
1723
1724 /* In varasm.c  */
1725
1726 struct function;
1727 extern rtx get_pool_constant (rtx);
1728 extern rtx get_pool_constant_mark (rtx, bool *);
1729 extern enum machine_mode get_pool_mode (const_rtx);
1730 extern rtx simplify_subtraction (rtx);
1731 extern void decide_function_section (tree);
1732
1733 /* In function.c  */
1734 extern rtx assign_stack_local (enum machine_mode, HOST_WIDE_INT, int);
1735 #define ASLK_REDUCE_ALIGN 1
1736 #define ASLK_RECORD_PAD 2
1737 extern rtx assign_stack_local_1 (enum machine_mode, HOST_WIDE_INT, int, int);
1738 extern rtx assign_stack_temp (enum machine_mode, HOST_WIDE_INT, int);
1739 extern rtx assign_stack_temp_for_type (enum machine_mode,
1740                                        HOST_WIDE_INT, int, tree);
1741 extern rtx assign_temp (tree, int, int, int);
1742
1743 /* In emit-rtl.c */
1744 extern rtx emit_insn_before (rtx, rtx);
1745 extern rtx emit_insn_before_noloc (rtx, rtx, struct basic_block_def *);
1746 extern rtx emit_insn_before_setloc (rtx, rtx, int);
1747 extern rtx emit_jump_insn_before (rtx, rtx);
1748 extern rtx emit_jump_insn_before_noloc (rtx, rtx);
1749 extern rtx emit_jump_insn_before_setloc (rtx, rtx, int);
1750 extern rtx emit_call_insn_before (rtx, rtx);
1751 extern rtx emit_call_insn_before_noloc (rtx, rtx);
1752 extern rtx emit_call_insn_before_setloc (rtx, rtx, int);
1753 extern rtx emit_debug_insn_before (rtx, rtx);
1754 extern rtx emit_debug_insn_before_noloc (rtx, rtx);
1755 extern rtx emit_debug_insn_before_setloc (rtx, rtx, int);
1756 extern rtx emit_barrier_before (rtx);
1757 extern rtx emit_label_before (rtx, rtx);
1758 extern rtx emit_note_before (enum insn_note, rtx);
1759 extern rtx emit_insn_after (rtx, rtx);
1760 extern rtx emit_insn_after_noloc (rtx, rtx, struct basic_block_def *);
1761 extern rtx emit_insn_after_setloc (rtx, rtx, int);
1762 extern rtx emit_jump_insn_after (rtx, rtx);
1763 extern rtx emit_jump_insn_after_noloc (rtx, rtx);
1764 extern rtx emit_jump_insn_after_setloc (rtx, rtx, int);
1765 extern rtx emit_call_insn_after (rtx, rtx);
1766 extern rtx emit_call_insn_after_noloc (rtx, rtx);
1767 extern rtx emit_call_insn_after_setloc (rtx, rtx, int);
1768 extern rtx emit_debug_insn_after (rtx, rtx);
1769 extern rtx emit_debug_insn_after_noloc (rtx, rtx);
1770 extern rtx emit_debug_insn_after_setloc (rtx, rtx, int);
1771 extern rtx emit_barrier_after (rtx);
1772 extern rtx emit_label_after (rtx, rtx);
1773 extern rtx emit_note_after (enum insn_note, rtx);
1774 extern rtx emit_insn (rtx);
1775 extern rtx emit_debug_insn (rtx);
1776 extern rtx emit_jump_insn (rtx);
1777 extern rtx emit_call_insn (rtx);
1778 extern rtx emit_label (rtx);
1779 extern rtx emit_barrier (void);
1780 extern rtx emit_note (enum insn_note);
1781 extern rtx emit_note_copy (rtx);
1782 extern rtx gen_clobber (rtx);
1783 extern rtx emit_clobber (rtx);
1784 extern rtx gen_use (rtx);
1785 extern rtx emit_use (rtx);
1786 extern rtx make_insn_raw (rtx);
1787 extern rtx make_debug_insn_raw (rtx);
1788 extern rtx make_jump_insn_raw (rtx);
1789 extern void add_function_usage_to (rtx, rtx);
1790 extern rtx last_call_insn (void);
1791 extern rtx previous_insn (rtx);
1792 extern rtx next_insn (rtx);
1793 extern rtx prev_nonnote_insn (rtx);
1794 extern rtx prev_nonnote_insn_bb (rtx);
1795 extern rtx next_nonnote_insn (rtx);
1796 extern rtx next_nonnote_insn_bb (rtx);
1797 extern rtx prev_nondebug_insn (rtx);
1798 extern rtx next_nondebug_insn (rtx);
1799 extern rtx prev_nonnote_nondebug_insn (rtx);
1800 extern rtx next_nonnote_nondebug_insn (rtx);
1801 extern rtx prev_real_insn (rtx);
1802 extern rtx next_real_insn (rtx);
1803 extern rtx prev_active_insn (rtx);
1804 extern rtx next_active_insn (rtx);
1805 extern int active_insn_p (const_rtx);
1806 extern rtx prev_label (rtx);
1807 extern rtx next_label (rtx);
1808 extern rtx skip_consecutive_labels (rtx);
1809 extern rtx next_cc0_user (rtx);
1810 extern rtx prev_cc0_setter (rtx);
1811
1812 /* In cfglayout.c  */
1813 extern int insn_line (const_rtx);
1814 extern const char * insn_file (const_rtx);
1815 extern location_t locator_location (int);
1816 extern int locator_line (int);
1817 extern const char * locator_file (int);
1818 extern bool locator_eq (int, int);
1819 extern int prologue_locator, epilogue_locator;
1820
1821 /* In jump.c */
1822 extern enum rtx_code reverse_condition (enum rtx_code);
1823 extern enum rtx_code reverse_condition_maybe_unordered (enum rtx_code);
1824 extern enum rtx_code swap_condition (enum rtx_code);
1825 extern enum rtx_code unsigned_condition (enum rtx_code);
1826 extern enum rtx_code signed_condition (enum rtx_code);
1827 extern void mark_jump_label (rtx, rtx, int);
1828 extern unsigned int cleanup_barriers (void);
1829
1830 /* In jump.c */
1831 extern rtx delete_related_insns (rtx);
1832
1833 /* In recog.c  */
1834 extern rtx *find_constant_term_loc (rtx *);
1835
1836 /* In emit-rtl.c  */
1837 extern rtx try_split (rtx, rtx, int);
1838 extern int split_branch_probability;
1839
1840 /* In unknown file  */
1841 extern rtx split_insns (rtx, rtx);
1842
1843 /* In simplify-rtx.c  */
1844 extern rtx simplify_const_unary_operation (enum rtx_code, enum machine_mode,
1845                                            rtx, enum machine_mode);
1846 extern rtx simplify_unary_operation (enum rtx_code, enum machine_mode, rtx,
1847                                      enum machine_mode);
1848 extern rtx simplify_const_binary_operation (enum rtx_code, enum machine_mode,
1849                                             rtx, rtx);
1850 extern rtx simplify_binary_operation (enum rtx_code, enum machine_mode, rtx,
1851                                       rtx);
1852 extern rtx simplify_ternary_operation (enum rtx_code, enum machine_mode,
1853                                        enum machine_mode, rtx, rtx, rtx);
1854 extern rtx simplify_const_relational_operation (enum rtx_code,
1855                                                 enum machine_mode, rtx, rtx);
1856 extern rtx simplify_relational_operation (enum rtx_code, enum machine_mode,
1857                                           enum machine_mode, rtx, rtx);
1858 extern rtx simplify_gen_binary (enum rtx_code, enum machine_mode, rtx, rtx);
1859 extern rtx simplify_gen_unary (enum rtx_code, enum machine_mode, rtx,
1860                                enum machine_mode);
1861 extern rtx simplify_gen_ternary (enum rtx_code, enum machine_mode,
1862                                  enum machine_mode, rtx, rtx, rtx);
1863 extern rtx simplify_gen_relational (enum rtx_code, enum machine_mode,
1864                                     enum machine_mode, rtx, rtx);
1865 extern rtx simplify_subreg (enum machine_mode, rtx, enum machine_mode,
1866                             unsigned int);
1867 extern rtx simplify_gen_subreg (enum machine_mode, rtx, enum machine_mode,
1868                                 unsigned int);
1869 extern rtx simplify_replace_fn_rtx (rtx, const_rtx,
1870                                     rtx (*fn) (rtx, const_rtx, void *), void *);
1871 extern rtx simplify_replace_rtx (rtx, const_rtx, rtx);
1872 extern rtx simplify_rtx (const_rtx);
1873 extern rtx avoid_constant_pool_reference (rtx);
1874 extern rtx delegitimize_mem_from_attrs (rtx);
1875 extern bool mode_signbit_p (enum machine_mode, const_rtx);
1876 extern bool val_signbit_p (enum machine_mode, unsigned HOST_WIDE_INT);
1877 extern bool val_signbit_known_set_p (enum machine_mode,
1878                                      unsigned HOST_WIDE_INT);
1879 extern bool val_signbit_known_clear_p (enum machine_mode,
1880                                        unsigned HOST_WIDE_INT);
1881
1882 /* In reginfo.c  */
1883 extern enum machine_mode choose_hard_reg_mode (unsigned int, unsigned int,
1884                                                bool);
1885
1886 /* In emit-rtl.c  */
1887 extern rtx set_unique_reg_note (rtx, enum reg_note, rtx);
1888 extern void set_insn_deleted (rtx);
1889
1890 /* Functions in rtlanal.c */
1891
1892 /* Single set is implemented as macro for performance reasons.  */
1893 #define single_set(I) (INSN_P (I) \
1894                        ? (GET_CODE (PATTERN (I)) == SET \
1895                           ? PATTERN (I) : single_set_1 (I)) \
1896                        : NULL_RTX)
1897 #define single_set_1(I) single_set_2 (I, PATTERN (I))
1898
1899 /* Structure used for passing data to REPLACE_LABEL.  */
1900 typedef struct replace_label_data
1901 {
1902   rtx r1;
1903   rtx r2;
1904   bool update_label_nuses;
1905 } replace_label_data;
1906
1907 extern int rtx_addr_can_trap_p (const_rtx);
1908 extern bool nonzero_address_p (const_rtx);
1909 extern int rtx_unstable_p (const_rtx);
1910 extern bool rtx_varies_p (const_rtx, bool);
1911 extern bool rtx_addr_varies_p (const_rtx, bool);
1912 extern HOST_WIDE_INT get_integer_term (const_rtx);
1913 extern rtx get_related_value (const_rtx);
1914 extern bool offset_within_block_p (const_rtx, HOST_WIDE_INT);
1915 extern void split_const (rtx, rtx *, rtx *);
1916 extern int reg_mentioned_p (const_rtx, const_rtx);
1917 extern int count_occurrences (const_rtx, const_rtx, int);
1918 extern int reg_referenced_p (const_rtx, const_rtx);
1919 extern int reg_used_between_p (const_rtx, const_rtx, const_rtx);
1920 extern int reg_set_between_p (const_rtx, const_rtx, const_rtx);
1921 extern int commutative_operand_precedence (rtx);
1922 extern bool swap_commutative_operands_p (rtx, rtx);
1923 extern int modified_between_p (const_rtx, const_rtx, const_rtx);
1924 extern int no_labels_between_p (const_rtx, const_rtx);
1925 extern int modified_in_p (const_rtx, const_rtx);
1926 extern int reg_set_p (const_rtx, const_rtx);
1927 extern rtx single_set_2 (const_rtx, const_rtx);
1928 extern int multiple_sets (const_rtx);
1929 extern int set_noop_p (const_rtx);
1930 extern int noop_move_p (const_rtx);
1931 extern rtx find_last_value (rtx, rtx *, rtx, int);
1932 extern int refers_to_regno_p (unsigned int, unsigned int, const_rtx, rtx *);
1933 extern int reg_overlap_mentioned_p (const_rtx, const_rtx);
1934 extern const_rtx set_of (const_rtx, const_rtx);
1935 extern void note_stores (const_rtx, void (*) (rtx, const_rtx, void *), void *);
1936 extern void note_uses (rtx *, void (*) (rtx *, void *), void *);
1937 extern int dead_or_set_p (const_rtx, const_rtx);
1938 extern int dead_or_set_regno_p (const_rtx, unsigned int);
1939 extern rtx find_reg_note (const_rtx, enum reg_note, const_rtx);
1940 extern rtx find_regno_note (const_rtx, enum reg_note, unsigned int);
1941 extern rtx find_reg_equal_equiv_note (const_rtx);
1942 extern rtx find_constant_src (const_rtx);
1943 extern int find_reg_fusage (const_rtx, enum rtx_code, const_rtx);
1944 extern int find_regno_fusage (const_rtx, enum rtx_code, unsigned int);
1945 extern rtx alloc_reg_note (enum reg_note, rtx, rtx);
1946 extern void add_reg_note (rtx, enum reg_note, rtx);
1947 extern void remove_note (rtx, const_rtx);
1948 extern void remove_reg_equal_equiv_notes (rtx);
1949 extern void remove_reg_equal_equiv_notes_for_regno (unsigned int);
1950 extern int side_effects_p (const_rtx);
1951 extern int volatile_refs_p (const_rtx);
1952 extern int volatile_insn_p (const_rtx);
1953 extern int may_trap_p_1 (const_rtx, unsigned);
1954 extern int may_trap_p (const_rtx);
1955 extern int may_trap_or_fault_p (const_rtx);
1956 extern bool can_throw_internal (const_rtx);
1957 extern bool can_throw_external (const_rtx);
1958 extern bool insn_could_throw_p (const_rtx);
1959 extern bool insn_nothrow_p (const_rtx);
1960 extern bool can_nonlocal_goto (const_rtx);
1961 extern void copy_reg_eh_region_note_forward (rtx, rtx, rtx);
1962 extern void copy_reg_eh_region_note_backward(rtx, rtx, rtx);
1963 extern int inequality_comparisons_p (const_rtx);
1964 extern rtx replace_rtx (rtx, rtx, rtx);
1965 extern int replace_label (rtx *, void *);
1966 extern int rtx_referenced_p (rtx, rtx);
1967 extern bool tablejump_p (const_rtx, rtx *, rtx *);
1968 extern int computed_jump_p (const_rtx);
1969
1970 typedef int (*rtx_function) (rtx *, void *);
1971 extern int for_each_rtx (rtx *, rtx_function, void *);
1972
1973 /* Callback for for_each_inc_dec, to process the autoinc operation OP
1974    within MEM that sets DEST to SRC + SRCOFF, or SRC if SRCOFF is
1975    NULL.  The callback is passed the same opaque ARG passed to
1976    for_each_inc_dec.  Return zero to continue looking for other
1977    autoinc operations, -1 to skip OP's operands, and any other value
1978    to interrupt the traversal and return that value to the caller of
1979    for_each_inc_dec.  */
1980 typedef int (*for_each_inc_dec_fn) (rtx mem, rtx op, rtx dest, rtx src,
1981                                     rtx srcoff, void *arg);
1982 extern int for_each_inc_dec (rtx *, for_each_inc_dec_fn, void *arg);
1983
1984 typedef int (*rtx_equal_p_callback_function) (const_rtx *, const_rtx *,
1985                                               rtx *, rtx *);
1986 extern int rtx_equal_p_cb (const_rtx, const_rtx,
1987                            rtx_equal_p_callback_function);
1988
1989 typedef int (*hash_rtx_callback_function) (const_rtx, enum machine_mode, rtx *,
1990                                            enum machine_mode *);
1991 extern unsigned hash_rtx_cb (const_rtx, enum machine_mode, int *, int *,
1992                              bool, hash_rtx_callback_function);
1993
1994 extern rtx regno_use_in (unsigned int, rtx);
1995 extern int auto_inc_p (const_rtx);
1996 extern int in_expr_list_p (const_rtx, const_rtx);
1997 extern void remove_node_from_expr_list (const_rtx, rtx *);
1998 extern int loc_mentioned_in_p (rtx *, const_rtx);
1999 extern rtx find_first_parameter_load (rtx, rtx);
2000 extern bool keep_with_call_p (const_rtx);
2001 extern bool label_is_jump_target_p (const_rtx, const_rtx);
2002 extern int insn_rtx_cost (rtx, bool);
2003
2004 /* Given an insn and condition, return a canonical description of
2005    the test being made.  */
2006 extern rtx canonicalize_condition (rtx, rtx, int, rtx *, rtx, int, int);
2007
2008 /* Given a JUMP_INSN, return a canonical description of the test
2009    being made.  */
2010 extern rtx get_condition (rtx, rtx *, int, int);
2011
2012 /* Information about a subreg of a hard register.  */
2013 struct subreg_info
2014 {
2015   /* Offset of first hard register involved in the subreg.  */
2016   int offset;
2017   /* Number of hard registers involved in the subreg.  */
2018   int nregs;
2019   /* Whether this subreg can be represented as a hard reg with the new
2020      mode.  */
2021   bool representable_p;
2022 };
2023
2024 extern void subreg_get_info (unsigned int, enum machine_mode,
2025                              unsigned int, enum machine_mode,
2026                              struct subreg_info *);
2027
2028 /* lists.c */
2029
2030 extern void free_EXPR_LIST_list         (rtx *);
2031 extern void free_INSN_LIST_list         (rtx *);
2032 extern void free_EXPR_LIST_node         (rtx);
2033 extern void free_INSN_LIST_node         (rtx);
2034 extern rtx alloc_INSN_LIST                      (rtx, rtx);
2035 extern rtx alloc_EXPR_LIST                      (int, rtx, rtx);
2036 extern void remove_free_INSN_LIST_elem (rtx, rtx *);
2037 extern rtx remove_list_elem (rtx, rtx *);
2038 extern rtx remove_free_INSN_LIST_node (rtx *);
2039 extern rtx remove_free_EXPR_LIST_node (rtx *);
2040
2041
2042 /* reginfo.c */
2043
2044 /* Initialize may_move_cost and friends for mode M.  */
2045 extern void init_move_cost (enum machine_mode);
2046 /* Resize reg info.  */
2047 extern bool resize_reg_info (void);
2048 /* Free up register info memory.  */
2049 extern void free_reg_info (void);
2050 extern void init_subregs_of_mode (void);
2051 extern void finish_subregs_of_mode (void);
2052
2053 /* recog.c */
2054 extern rtx extract_asm_operands (rtx);
2055 extern int asm_noperands (const_rtx);
2056 extern const char *decode_asm_operands (rtx, rtx *, rtx **, const char **,
2057                                         enum machine_mode *, location_t *);
2058
2059 extern enum reg_class reg_preferred_class (int);
2060 extern enum reg_class reg_alternate_class (int);
2061 extern enum reg_class reg_allocno_class (int);
2062 extern void setup_reg_classes (int, enum reg_class, enum reg_class,
2063                                enum reg_class);
2064
2065 extern void split_all_insns (void);
2066 extern unsigned int split_all_insns_noflow (void);
2067
2068 #define MAX_SAVED_CONST_INT 64
2069 extern GTY(()) rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
2070
2071 #define const0_rtx      (const_int_rtx[MAX_SAVED_CONST_INT])
2072 #define const1_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+1])
2073 #define const2_rtx      (const_int_rtx[MAX_SAVED_CONST_INT+2])
2074 #define constm1_rtx     (const_int_rtx[MAX_SAVED_CONST_INT-1])
2075 extern GTY(()) rtx const_true_rtx;
2076
2077 extern GTY(()) rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
2078
2079 /* Returns a constant 0 rtx in mode MODE.  Integer modes are treated the
2080    same as VOIDmode.  */
2081
2082 #define CONST0_RTX(MODE) (const_tiny_rtx[0][(int) (MODE)])
2083
2084 /* Likewise, for the constants 1 and 2.  */
2085
2086 #define CONST1_RTX(MODE) (const_tiny_rtx[1][(int) (MODE)])
2087 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
2088
2089 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
2090    is used to represent the frame pointer.  This is because the
2091    hard frame pointer and the automatic variables are separated by an amount
2092    that cannot be determined until after register allocation.  We can assume
2093    that in this case ELIMINABLE_REGS will be defined, one action of which
2094    will be to eliminate FRAME_POINTER_REGNUM into HARD_FRAME_POINTER_REGNUM.  */
2095 #ifndef HARD_FRAME_POINTER_REGNUM
2096 #define HARD_FRAME_POINTER_REGNUM FRAME_POINTER_REGNUM
2097 #endif
2098
2099 #ifndef HARD_FRAME_POINTER_IS_FRAME_POINTER
2100 #define HARD_FRAME_POINTER_IS_FRAME_POINTER \
2101   (HARD_FRAME_POINTER_REGNUM == FRAME_POINTER_REGNUM)
2102 #endif
2103
2104 #ifndef HARD_FRAME_POINTER_IS_ARG_POINTER
2105 #define HARD_FRAME_POINTER_IS_ARG_POINTER \
2106   (HARD_FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM)
2107 #endif
2108
2109 /* Index labels for global_rtl.  */
2110 enum global_rtl_index
2111 {
2112   GR_PC,
2113   GR_CC0,
2114   GR_RETURN,
2115   GR_SIMPLE_RETURN,
2116   GR_STACK_POINTER,
2117   GR_FRAME_POINTER,
2118 /* For register elimination to work properly these hard_frame_pointer_rtx,
2119    frame_pointer_rtx, and arg_pointer_rtx must be the same if they refer to
2120    the same register.  */
2121 #if FRAME_POINTER_REGNUM == ARG_POINTER_REGNUM
2122   GR_ARG_POINTER = GR_FRAME_POINTER,
2123 #endif
2124 #if HARD_FRAME_POINTER_IS_FRAME_POINTER
2125   GR_HARD_FRAME_POINTER = GR_FRAME_POINTER,
2126 #else
2127   GR_HARD_FRAME_POINTER,
2128 #endif
2129 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
2130 #if HARD_FRAME_POINTER_IS_ARG_POINTER
2131   GR_ARG_POINTER = GR_HARD_FRAME_POINTER,
2132 #else
2133   GR_ARG_POINTER,
2134 #endif
2135 #endif
2136   GR_VIRTUAL_INCOMING_ARGS,
2137   GR_VIRTUAL_STACK_ARGS,
2138   GR_VIRTUAL_STACK_DYNAMIC,
2139   GR_VIRTUAL_OUTGOING_ARGS,
2140   GR_VIRTUAL_CFA,
2141   GR_VIRTUAL_PREFERRED_STACK_BOUNDARY,
2142
2143   GR_MAX
2144 };
2145
2146 /* Target-dependent globals.  */
2147 struct GTY(()) target_rtl {
2148   /* All references to the hard registers in global_rtl_index go through
2149      these unique rtl objects.  On machines where the frame-pointer and
2150      arg-pointer are the same register, they use the same unique object.
2151
2152      After register allocation, other rtl objects which used to be pseudo-regs
2153      may be clobbered to refer to the frame-pointer register.
2154      But references that were originally to the frame-pointer can be
2155      distinguished from the others because they contain frame_pointer_rtx.
2156
2157      When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
2158      tricky: until register elimination has taken place hard_frame_pointer_rtx
2159      should be used if it is being set, and frame_pointer_rtx otherwise.  After
2160      register elimination hard_frame_pointer_rtx should always be used.
2161      On machines where the two registers are same (most) then these are the
2162      same.  */
2163   rtx x_global_rtl[GR_MAX];
2164
2165   /* A unique representation of (REG:Pmode PIC_OFFSET_TABLE_REGNUM).  */
2166   rtx x_pic_offset_table_rtx;
2167
2168   /* A unique representation of (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM).
2169      This is used to implement __builtin_return_address for some machines;
2170      see for instance the MIPS port.  */
2171   rtx x_return_address_pointer_rtx;
2172
2173   /* Commonly used RTL for hard registers.  These objects are not
2174      necessarily unique, so we allocate them separately from global_rtl.
2175      They are initialized once per compilation unit, then copied into
2176      regno_reg_rtx at the beginning of each function.  */
2177   rtx x_initial_regno_reg_rtx[FIRST_PSEUDO_REGISTER];
2178
2179   /* A sample (mem:M stack_pointer_rtx) rtx for each mode M.  */
2180   rtx x_top_of_stack[MAX_MACHINE_MODE];
2181
2182   /* Static hunks of RTL used by the aliasing code; these are treated
2183      as persistent to avoid unnecessary RTL allocations.  */
2184   rtx x_static_reg_base_value[FIRST_PSEUDO_REGISTER];
2185
2186   /* The default memory attributes for each mode.  */
2187   struct mem_attrs *x_mode_mem_attrs[(int) MAX_MACHINE_MODE];
2188 };
2189
2190 extern GTY(()) struct target_rtl default_target_rtl;
2191 #if SWITCHABLE_TARGET
2192 extern struct target_rtl *this_target_rtl;
2193 #else
2194 #define this_target_rtl (&default_target_rtl)
2195 #endif
2196
2197 #define global_rtl                              \
2198   (this_target_rtl->x_global_rtl)
2199 #define pic_offset_table_rtx \
2200   (this_target_rtl->x_pic_offset_table_rtx)
2201 #define return_address_pointer_rtx \
2202   (this_target_rtl->x_return_address_pointer_rtx)
2203 #define top_of_stack \
2204   (this_target_rtl->x_top_of_stack)
2205 #define mode_mem_attrs \
2206   (this_target_rtl->x_mode_mem_attrs)
2207
2208 /* Standard pieces of rtx, to be substituted directly into things.  */
2209 #define pc_rtx                  (global_rtl[GR_PC])
2210 #define ret_rtx                 (global_rtl[GR_RETURN])
2211 #define simple_return_rtx       (global_rtl[GR_SIMPLE_RETURN])
2212 #define cc0_rtx                 (global_rtl[GR_CC0])
2213
2214 /* All references to certain hard regs, except those created
2215    by allocating pseudo regs into them (when that's possible),
2216    go through these unique rtx objects.  */
2217 #define stack_pointer_rtx       (global_rtl[GR_STACK_POINTER])
2218 #define frame_pointer_rtx       (global_rtl[GR_FRAME_POINTER])
2219 #define hard_frame_pointer_rtx  (global_rtl[GR_HARD_FRAME_POINTER])
2220 #define arg_pointer_rtx         (global_rtl[GR_ARG_POINTER])
2221
2222 #ifndef GENERATOR_FILE
2223 /* Return the attributes of a MEM rtx.  */
2224 static inline struct mem_attrs *
2225 get_mem_attrs (const_rtx x)
2226 {
2227   struct mem_attrs *attrs;
2228
2229   attrs = MEM_ATTRS (x);
2230   if (!attrs)
2231     attrs = mode_mem_attrs[(int) GET_MODE (x)];
2232   return attrs;
2233 }
2234 #endif
2235
2236 /* Include the RTL generation functions.  */
2237
2238 #ifndef GENERATOR_FILE
2239 #include "genrtl.h"
2240 #undef gen_rtx_ASM_INPUT
2241 #define gen_rtx_ASM_INPUT(MODE, ARG0)                           \
2242   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), 0)
2243 #define gen_rtx_ASM_INPUT_loc(MODE, ARG0, LOC)                  \
2244   gen_rtx_fmt_si (ASM_INPUT, (MODE), (ARG0), (LOC))
2245 #endif
2246
2247 /* There are some RTL codes that require special attention; the
2248    generation functions included above do the raw handling.  If you
2249    add to this list, modify special_rtx in gengenrtl.c as well.  */
2250
2251 extern rtx gen_rtx_CONST_INT (enum machine_mode, HOST_WIDE_INT);
2252 extern rtx gen_rtx_CONST_VECTOR (enum machine_mode, rtvec);
2253 extern rtx gen_raw_REG (enum machine_mode, int);
2254 extern rtx gen_rtx_REG (enum machine_mode, unsigned);
2255 extern rtx gen_rtx_SUBREG (enum machine_mode, rtx, int);
2256 extern rtx gen_rtx_MEM (enum machine_mode, rtx);
2257
2258 #define GEN_INT(N)  gen_rtx_CONST_INT (VOIDmode, (N))
2259
2260 /* Virtual registers are used during RTL generation to refer to locations into
2261    the stack frame when the actual location isn't known until RTL generation
2262    is complete.  The routine instantiate_virtual_regs replaces these with
2263    the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
2264    a constant.  */
2265
2266 #define FIRST_VIRTUAL_REGISTER  (FIRST_PSEUDO_REGISTER)
2267
2268 /* This points to the first word of the incoming arguments passed on the stack,
2269    either by the caller or by the callee when pretending it was passed by the
2270    caller.  */
2271
2272 #define virtual_incoming_args_rtx       (global_rtl[GR_VIRTUAL_INCOMING_ARGS])
2273
2274 #define VIRTUAL_INCOMING_ARGS_REGNUM    (FIRST_VIRTUAL_REGISTER)
2275
2276 /* If FRAME_GROWS_DOWNWARD, this points to immediately above the first
2277    variable on the stack.  Otherwise, it points to the first variable on
2278    the stack.  */
2279
2280 #define virtual_stack_vars_rtx          (global_rtl[GR_VIRTUAL_STACK_ARGS])
2281
2282 #define VIRTUAL_STACK_VARS_REGNUM       ((FIRST_VIRTUAL_REGISTER) + 1)
2283
2284 /* This points to the location of dynamically-allocated memory on the stack
2285    immediately after the stack pointer has been adjusted by the amount
2286    desired.  */
2287
2288 #define virtual_stack_dynamic_rtx       (global_rtl[GR_VIRTUAL_STACK_DYNAMIC])
2289
2290 #define VIRTUAL_STACK_DYNAMIC_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 2)
2291
2292 /* This points to the location in the stack at which outgoing arguments should
2293    be written when the stack is pre-pushed (arguments pushed using push
2294    insns always use sp).  */
2295
2296 #define virtual_outgoing_args_rtx       (global_rtl[GR_VIRTUAL_OUTGOING_ARGS])
2297
2298 #define VIRTUAL_OUTGOING_ARGS_REGNUM    ((FIRST_VIRTUAL_REGISTER) + 3)
2299
2300 /* This points to the Canonical Frame Address of the function.  This
2301    should correspond to the CFA produced by INCOMING_FRAME_SP_OFFSET,
2302    but is calculated relative to the arg pointer for simplicity; the
2303    frame pointer nor stack pointer are necessarily fixed relative to
2304    the CFA until after reload.  */
2305
2306 #define virtual_cfa_rtx                 (global_rtl[GR_VIRTUAL_CFA])
2307
2308 #define VIRTUAL_CFA_REGNUM              ((FIRST_VIRTUAL_REGISTER) + 4)
2309
2310 #define LAST_VIRTUAL_POINTER_REGISTER   ((FIRST_VIRTUAL_REGISTER) + 4)
2311
2312 /* This is replaced by crtl->preferred_stack_boundary / BITS_PER_UNIT
2313    when finalized.  */
2314
2315 #define virtual_preferred_stack_boundary_rtx \
2316         (global_rtl[GR_VIRTUAL_PREFERRED_STACK_BOUNDARY])
2317
2318 #define VIRTUAL_PREFERRED_STACK_BOUNDARY_REGNUM \
2319                                         ((FIRST_VIRTUAL_REGISTER) + 5)
2320
2321 #define LAST_VIRTUAL_REGISTER           ((FIRST_VIRTUAL_REGISTER) + 5)
2322
2323 /* Nonzero if REGNUM is a pointer into the stack frame.  */
2324 #define REGNO_PTR_FRAME_P(REGNUM)               \
2325   ((REGNUM) == STACK_POINTER_REGNUM             \
2326    || (REGNUM) == FRAME_POINTER_REGNUM          \
2327    || (REGNUM) == HARD_FRAME_POINTER_REGNUM     \
2328    || (REGNUM) == ARG_POINTER_REGNUM            \
2329    || ((REGNUM) >= FIRST_VIRTUAL_REGISTER       \
2330        && (REGNUM) <= LAST_VIRTUAL_POINTER_REGISTER))
2331
2332 /* REGNUM never really appearing in the INSN stream.  */
2333 #define INVALID_REGNUM                  (~(unsigned int) 0)
2334
2335 extern rtx output_constant_def (tree, int);
2336 extern rtx lookup_constant_def (tree);
2337
2338 /* Nonzero after end of reload pass.
2339    Set to 1 or 0 by reload1.c.  */
2340
2341 extern int reload_completed;
2342
2343 /* Nonzero after thread_prologue_and_epilogue_insns has run.  */
2344 extern int epilogue_completed;
2345
2346 /* Set to 1 while reload_as_needed is operating.
2347    Required by some machines to handle any generated moves differently.  */
2348
2349 extern int reload_in_progress;
2350
2351 /* This macro indicates whether you may create a new
2352    pseudo-register.  */
2353
2354 #define can_create_pseudo_p() (!reload_in_progress && !reload_completed)
2355
2356 #ifdef STACK_REGS
2357 /* Nonzero after end of regstack pass.
2358    Set to 1 or 0 by reg-stack.c.  */
2359 extern int regstack_completed;
2360 #endif
2361
2362 /* If this is nonzero, we do not bother generating VOLATILE
2363    around volatile memory references, and we are willing to
2364    output indirect addresses.  If cse is to follow, we reject
2365    indirect addresses so a useful potential cse is generated;
2366    if it is used only once, instruction combination will produce
2367    the same indirect address eventually.  */
2368 extern int cse_not_expected;
2369
2370 /* Translates rtx code to tree code, for those codes needed by
2371    REAL_ARITHMETIC.  The function returns an int because the caller may not
2372    know what `enum tree_code' means.  */
2373
2374 extern int rtx_to_tree_code (enum rtx_code);
2375
2376 /* In cse.c */
2377 extern int delete_trivially_dead_insns (rtx, int);
2378 extern int cse_main (rtx, int);
2379 extern int exp_equiv_p (const_rtx, const_rtx, int, bool);
2380 extern unsigned hash_rtx (const_rtx x, enum machine_mode, int *, int *, bool);
2381
2382 /* In dse.c */
2383 extern void check_for_inc_dec (rtx insn);
2384
2385 /* In jump.c */
2386 extern int comparison_dominates_p (enum rtx_code, enum rtx_code);
2387 extern bool jump_to_label_p (rtx);
2388 extern int condjump_p (const_rtx);
2389 extern int any_condjump_p (const_rtx);
2390 extern int any_uncondjump_p (const_rtx);
2391 extern rtx pc_set (const_rtx);
2392 extern rtx condjump_label (const_rtx);
2393 extern int simplejump_p (const_rtx);
2394 extern int returnjump_p (rtx);
2395 extern int eh_returnjump_p (rtx);
2396 extern int onlyjump_p (const_rtx);
2397 extern int only_sets_cc0_p (const_rtx);
2398 extern int sets_cc0_p (const_rtx);
2399 extern int invert_jump_1 (rtx, rtx);
2400 extern int invert_jump (rtx, rtx, int);
2401 extern int rtx_renumbered_equal_p (const_rtx, const_rtx);
2402 extern int true_regnum (const_rtx);
2403 extern unsigned int reg_or_subregno (const_rtx);
2404 extern int redirect_jump_1 (rtx, rtx);
2405 extern void redirect_jump_2 (rtx, rtx, rtx, int, int);
2406 extern int redirect_jump (rtx, rtx, int);
2407 extern void rebuild_jump_labels (rtx);
2408 extern void rebuild_jump_labels_chain (rtx);
2409 extern rtx reversed_comparison (const_rtx, enum machine_mode);
2410 extern enum rtx_code reversed_comparison_code (const_rtx, const_rtx);
2411 extern enum rtx_code reversed_comparison_code_parts (enum rtx_code, const_rtx,
2412                                                      const_rtx, const_rtx);
2413 extern void delete_for_peephole (rtx, rtx);
2414 extern int condjump_in_parallel_p (const_rtx);
2415
2416 /* In emit-rtl.c.  */
2417 extern int max_reg_num (void);
2418 extern int max_label_num (void);
2419 extern int get_first_label_num (void);
2420 extern void maybe_set_first_label_num (rtx);
2421 extern void delete_insns_since (rtx);
2422 extern void mark_reg_pointer (rtx, int);
2423 extern void mark_user_reg (rtx);
2424 extern void reset_used_flags (rtx);
2425 extern void set_used_flags (rtx);
2426 extern void reorder_insns (rtx, rtx, rtx);
2427 extern void reorder_insns_nobb (rtx, rtx, rtx);
2428 extern int get_max_insn_count (void);
2429 extern int in_sequence_p (void);
2430 extern void force_next_line_note (void);
2431 extern void init_emit (void);
2432 extern void init_emit_regs (void);
2433 extern void init_emit_once (void);
2434 extern void push_topmost_sequence (void);
2435 extern void pop_topmost_sequence (void);
2436 extern void set_new_first_and_last_insn (rtx, rtx);
2437 extern unsigned int unshare_all_rtl (void);
2438 extern void unshare_all_rtl_again (rtx);
2439 extern void unshare_all_rtl_in_chain (rtx);
2440 extern void verify_rtl_sharing (void);
2441 extern void link_cc0_insns (rtx);
2442 extern void add_insn (rtx);
2443 extern void add_insn_before (rtx, rtx, struct basic_block_def *);
2444 extern void add_insn_after (rtx, rtx, struct basic_block_def *);
2445 extern void remove_insn (rtx);
2446 extern rtx emit (rtx);
2447 extern rtx delete_insn (rtx);
2448 extern rtx entry_of_function (void);
2449 extern void emit_insn_at_entry (rtx);
2450 extern void delete_insn_chain (rtx, rtx, bool);
2451 extern rtx unlink_insn_chain (rtx, rtx);
2452 extern rtx delete_insn_and_edges (rtx);
2453 extern rtx gen_lowpart_SUBREG (enum machine_mode, rtx);
2454 extern rtx gen_const_mem (enum machine_mode, rtx);
2455 extern rtx gen_frame_mem (enum machine_mode, rtx);
2456 extern rtx gen_tmp_stack_mem (enum machine_mode, rtx);
2457 extern bool validate_subreg (enum machine_mode, enum machine_mode,
2458                              const_rtx, unsigned int);
2459
2460 /* In combine.c  */
2461 extern unsigned int extended_count (const_rtx, enum machine_mode, int);
2462 extern rtx remove_death (unsigned int, rtx);
2463 extern void dump_combine_stats (FILE *);
2464 extern void dump_combine_total_stats (FILE *);
2465
2466 /* In cfgcleanup.c  */
2467 extern void delete_dead_jumptables (void);
2468
2469 /* In sched-vis.c.  */
2470 extern void debug_bb_n_slim (int);
2471 extern void debug_bb_slim (struct basic_block_def *);
2472 extern void print_rtl_slim (FILE *, rtx, rtx, int, int);
2473 extern void print_rtl_slim_with_bb (FILE *, rtx, int);
2474 extern void dump_insn_slim (FILE *f, rtx x);
2475 extern void debug_insn_slim (rtx x);
2476
2477 /* In sched-rgn.c.  */
2478 extern void schedule_insns (void);
2479
2480 /* In sched-ebb.c.  */
2481 extern void schedule_ebbs (void);
2482
2483 /* In sel-sched-dump.c.  */
2484 extern void sel_sched_fix_param (const char *param, const char *val);
2485
2486 /* In print-rtl.c */
2487 extern const char *print_rtx_head;
2488 extern void debug_rtx (const_rtx);
2489 extern void debug_rtx_list (const_rtx, int);
2490 extern void debug_rtx_range (const_rtx, const_rtx);
2491 extern const_rtx debug_rtx_find (const_rtx, int);
2492 extern void print_mem_expr (FILE *, const_tree);
2493 extern void print_rtl (FILE *, const_rtx);
2494 extern void print_simple_rtl (FILE *, const_rtx);
2495 extern int print_rtl_single (FILE *, const_rtx);
2496 extern void print_inline_rtx (FILE *, const_rtx, int);
2497
2498 /* In function.c */
2499 extern void reposition_prologue_and_epilogue_notes (void);
2500 extern int prologue_epilogue_contains (const_rtx);
2501 extern int sibcall_epilogue_contains (const_rtx);
2502 extern void mark_temp_addr_taken (rtx);
2503 extern void update_temp_slot_address (rtx, rtx);
2504 extern void maybe_copy_prologue_epilogue_insn (rtx, rtx);
2505
2506 /* In stmt.c */
2507 extern void expand_null_return (void);
2508 extern void expand_naked_return (void);
2509 extern void emit_jump (rtx);
2510
2511 /* In expr.c */
2512 extern rtx move_by_pieces (rtx, rtx, unsigned HOST_WIDE_INT,
2513                            unsigned int, int);
2514 extern HOST_WIDE_INT find_args_size_adjust (rtx);
2515 extern int fixup_args_size_notes (rtx, rtx, int);
2516
2517 /* In cfgrtl.c */
2518 extern void print_rtl_with_bb (FILE *, const_rtx);
2519
2520 /* In cfg.c.  */
2521 extern void dump_reg_info (FILE *);
2522 extern void dump_flow_info (FILE *, int);
2523
2524 /* In expmed.c */
2525 extern void init_expmed (void);
2526 extern void expand_inc (rtx, rtx);
2527 extern void expand_dec (rtx, rtx);
2528
2529 /* In gcse.c */
2530 extern bool can_copy_p (enum machine_mode);
2531 extern bool can_assign_to_reg_without_clobbers_p (rtx);
2532 extern rtx fis_get_condition (rtx);
2533
2534 /* In ira.c */
2535 #ifdef HARD_CONST
2536 extern HARD_REG_SET eliminable_regset;
2537 #endif
2538 extern void mark_elimination (int, int);
2539
2540 /* In reginfo.c */
2541 extern int reg_classes_intersect_p (reg_class_t, reg_class_t);
2542 extern int reg_class_subset_p (reg_class_t, reg_class_t);
2543 extern void globalize_reg (tree, int);
2544 extern void init_reg_modes_target (void);
2545 extern void init_regs (void);
2546 extern void reinit_regs (void);
2547 extern void init_fake_stack_mems (void);
2548 extern void save_register_info (void);
2549 extern void init_reg_sets (void);
2550 extern void regclass (rtx, int);
2551 extern void reg_scan (rtx, unsigned int);
2552 extern void fix_register (const char *, int, int);
2553 extern bool invalid_mode_change_p (unsigned int, enum reg_class);
2554
2555 /* In reorg.c */
2556 extern void dbr_schedule (rtx);
2557
2558 /* In reload1.c */
2559 extern int function_invariant_p (const_rtx);
2560
2561 /* In calls.c */
2562 enum libcall_type
2563 {
2564   LCT_NORMAL = 0,
2565   LCT_CONST = 1,
2566   LCT_PURE = 2,
2567   LCT_NORETURN = 3,
2568   LCT_THROW = 4,
2569   LCT_RETURNS_TWICE = 5
2570 };
2571
2572 extern void emit_library_call (rtx, enum libcall_type, enum machine_mode, int,
2573                                ...);
2574 extern rtx emit_library_call_value (rtx, rtx, enum libcall_type,
2575                                     enum machine_mode, int, ...);
2576
2577 /* In varasm.c */
2578 extern void init_varasm_once (void);
2579
2580 extern rtx make_debug_expr_from_rtl (const_rtx);
2581
2582 /* In read-rtl.c */
2583 extern bool read_rtx (const char *, rtx *);
2584
2585 /* In alias.c */
2586 extern rtx canon_rtx (rtx);
2587 extern int true_dependence (const_rtx, enum machine_mode, const_rtx, bool (*)(const_rtx, bool));
2588 extern rtx get_addr (rtx);
2589 extern int canon_true_dependence (const_rtx, enum machine_mode, rtx, const_rtx,
2590                                   rtx, bool (*)(const_rtx, bool));
2591 extern int read_dependence (const_rtx, const_rtx);
2592 extern int anti_dependence (const_rtx, const_rtx);
2593 extern int output_dependence (const_rtx, const_rtx);
2594 extern int may_alias_p (const_rtx, const_rtx);
2595 extern void init_alias_target (void);
2596 extern void init_alias_analysis (void);
2597 extern void end_alias_analysis (void);
2598 extern void vt_equate_reg_base_value (const_rtx, const_rtx);
2599 extern bool memory_modified_in_insn_p (const_rtx, const_rtx);
2600 extern rtx find_base_term (rtx);
2601 extern rtx gen_hard_reg_clobber (enum machine_mode, unsigned int);
2602 extern rtx get_reg_known_value (unsigned int);
2603 extern bool get_reg_known_equiv_p (unsigned int);
2604 extern rtx get_reg_base_value (unsigned int);
2605
2606 #ifdef STACK_REGS
2607 extern int stack_regs_mentioned (const_rtx insn);
2608 #endif
2609
2610 /* In toplev.c */
2611 extern GTY(()) rtx stack_limit_rtx;
2612
2613 /* In predict.c */
2614 extern void invert_br_probabilities (rtx);
2615 extern bool expensive_function_p (int);
2616
2617 /* In var-tracking.c */
2618 extern unsigned int variable_tracking_main (void);
2619
2620 /* In stor-layout.c.  */
2621 extern void get_mode_bounds (enum machine_mode, int, enum machine_mode,
2622                              rtx *, rtx *);
2623
2624 /* In loop-unswitch.c  */
2625 extern rtx reversed_condition (rtx);
2626 extern rtx compare_and_jump_seq (rtx, rtx, enum rtx_code, rtx, int, rtx);
2627
2628 /* In loop-iv.c  */
2629 extern rtx canon_condition (rtx);
2630 extern void simplify_using_condition (rtx, rtx *, struct bitmap_head_def *);
2631
2632 /* In final.c  */
2633 extern unsigned int compute_alignments (void);
2634 extern int asm_str_count (const char *templ);
2635 \f
2636 struct rtl_hooks
2637 {
2638   rtx (*gen_lowpart) (enum machine_mode, rtx);
2639   rtx (*gen_lowpart_no_emit) (enum machine_mode, rtx);
2640   rtx (*reg_nonzero_bits) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2641                            unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT *);
2642   rtx (*reg_num_sign_bit_copies) (const_rtx, enum machine_mode, const_rtx, enum machine_mode,
2643                                   unsigned int, unsigned int *);
2644   bool (*reg_truncated_to_mode) (enum machine_mode, const_rtx);
2645
2646   /* Whenever you add entries here, make sure you adjust rtlhooks-def.h.  */
2647 };
2648
2649 /* Each pass can provide its own.  */
2650 extern struct rtl_hooks rtl_hooks;
2651
2652 /* ... but then it has to restore these.  */
2653 extern const struct rtl_hooks general_rtl_hooks;
2654
2655 /* Keep this for the nonce.  */
2656 #define gen_lowpart rtl_hooks.gen_lowpart
2657
2658 extern void insn_locators_alloc (void);
2659 extern void insn_locators_free (void);
2660 extern void insn_locators_finalize (void);
2661 extern void set_curr_insn_source_location (location_t);
2662 extern location_t get_curr_insn_source_location (void);
2663 extern void set_curr_insn_block (tree);
2664 extern tree get_curr_insn_block (void);
2665 extern int curr_insn_locator (void);
2666 extern bool optimize_insn_for_size_p (void);
2667 extern bool optimize_insn_for_speed_p (void);
2668
2669 /* rtl-error.c */
2670 extern void _fatal_insn_not_found (const_rtx, const char *, int, const char *)
2671      ATTRIBUTE_NORETURN;
2672 extern void _fatal_insn (const char *, const_rtx, const char *, int, const char *)
2673      ATTRIBUTE_NORETURN;
2674
2675 #define fatal_insn(msgid, insn) \
2676         _fatal_insn (msgid, insn, __FILE__, __LINE__, __FUNCTION__)
2677 #define fatal_insn_not_found(insn) \
2678         _fatal_insn_not_found (insn, __FILE__, __LINE__, __FUNCTION__)
2679
2680
2681
2682 #endif /* ! GCC_RTL_H */