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