gcc/rtl.h

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