gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 91-98, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* The default branch cost is 1.  */
  22 #ifndef BRANCH_COST
  23 #define BRANCH_COST 1
  24 #endif
  25
  26 /* Macros to access the slots of a QUEUED rtx.
  27    Here rather than in rtl.h because only the expansion pass
  28    should ever encounter a QUEUED.  */
  29
  30 /* The variable for which an increment is queued.  */
  31 #define QUEUED_VAR(P) XEXP (P, 0)
  32 /* If the increment has been emitted, this is the insn
  33    that does the increment.  It is zero before the increment is emitted.
  34    If more than one insn is emitted, this is the first insn.  */
  35 #define QUEUED_INSN(P) XEXP (P, 1)
  36 /* If a pre-increment copy has been generated, this is the copy
  37    (it is a temporary reg).  Zero if no copy made yet.  */
  38 #define QUEUED_COPY(P) XEXP (P, 2)
  39 /* This is the body to use for the insn to do the increment.
  40    It is used to emit the increment.  */
  41 #define QUEUED_BODY(P) XEXP (P, 3)
  42 /* Next QUEUED in the queue.  */
  43 #define QUEUED_NEXT(P) XEXP (P, 4)
  44
  45 /* This is the 4th arg to `expand_expr'.
  46    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  47    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  48    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  49     is a constant that is not a legitimate address.
  50    EXPAND_MEMORY_USE_* are explained below.  */
  51 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  52                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
  53                       EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
  54                       EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
  55
  56 /* Argument for chkr_* functions.
  57    MEMORY_USE_RO: the pointer reads memory.
  58    MEMORY_USE_WO: the pointer writes to memory.
  59    MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
  60                   example is (*ptr)++
  61    MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
  62                    if you know there are no pointers.  Using an INDIRECT_REF
  63                    with MEMORY_USE_BAD will abort.
  64    MEMORY_USE_TW: just test for writing, without update.  Special.
  65    MEMORY_USE_DONT: the memory is neither read nor written.  This is used by
  66                    '->' and '.'.  */
  67 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
  68                       MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
  69                       MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
  70
  71 /* List of labels that must never be deleted.  */
  72 extern rtx forced_labels;
  73
  74 /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
  75    So we can mark them all live at the end of the function, if stupid.  */
  76 extern rtx save_expr_regs;
  77
  78 /* Nonzero means __builtin_saveregs has already been done in this function.
  79    The value is the pseudoreg containing the value __builtin_saveregs
  80    returned.  */
  81 extern rtx saveregs_value;
  82
  83 /* Similarly for __builtin_apply_args.  */
  84 extern rtx apply_args_value;
  85
  86 extern int current_function_calls_alloca;
  87 extern int current_function_outgoing_args_size;
  88
  89 /* This is the offset from the arg pointer to the place where the first
  90    anonymous arg can be found, if there is one.  */
  91 extern rtx current_function_arg_offset_rtx;
  92
  93 /* This is nonzero if the current function uses the constant pool.  */
  94 extern int current_function_uses_const_pool;
  95
  96 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
  97 extern int current_function_uses_pic_offset_table;
  98
  99 /* The arg pointer hard register, or the pseudo into which it was copied.  */
 100 extern rtx current_function_internal_arg_pointer;
 101
 102 /* This is nonzero if memory access checking be enabled in the current
 103    function.  */
 104 extern int current_function_check_memory_usage;
 105
 106 /* Under some ABIs, it is the caller's responsibility to pop arguments
 107    pushed for function calls.  A naive implementation would simply pop
 108    the arguments immediately after each call.  However, if several
 109    function calls are made in a row, it is typically cheaper to pop
 110    all the arguments after all of the calls are complete since a
 111    single pop instruction can be used.  Therefore, GCC attempts to
 112    defer popping the arguments until absolutely necessary.  (For
 113    example, at the end of a conditional, the arguments must be popped,
 114    since code outside the conditional won't know whether or not the
 115    arguments need to be popped.)
 116
 117    When INHIBIT_DEFER_POP is non-zero, however, the compiler does not
 118    attempt to defer pops.  Instead, the stack is popped immediately
 119    after each call.  Rather then setting this variable directly, use
 120    NO_DEFER_POP and OK_DEFER_POP.  */
 121 extern int inhibit_defer_pop;
 122
 123 /* Prevent the compiler from deferring stack pops.  See
 124    inhibit_defer_pop for more information.  */
 125 #define NO_DEFER_POP (inhibit_defer_pop += 1)
 126
 127 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
 128    more information.  */
 129 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
 130
 131 /* Number of function calls seen so far in current function.  */
 132
 133 extern int function_call_count;
 134
 135 /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 136    for nonlocal gotos.  There is one for every nonlocal label in the function;
 137    this list matches the one in nonlocal_labels.
 138    Zero when function does not have nonlocal labels.  */
 139
 140 extern rtx nonlocal_goto_handler_slots;
 141
 142 /* RTX for stack slot that holds the stack pointer value to restore
 143    for a nonlocal goto.
 144    Zero when function does not have nonlocal labels.  */
 145
 146 extern rtx nonlocal_goto_stack_level;
 147
 148 /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 149    (labels to which there can be nonlocal gotos from nested functions)
 150    in this function.  */
 151
 152 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
 153 extern tree nonlocal_labels;
 154 #endif
 155
 156 /* Number of units that we should eventually pop off the stack.
 157    These are the arguments to function calls that have already returned.  */
 158 extern int pending_stack_adjust;
 159
 160 /* When temporaries are created by TARGET_EXPRs, they are created at
 161    this level of temp_slot_level, so that they can remain allocated
 162    until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 163    of TARGET_EXPRs.  */
 164 extern int target_temp_slot_level;
 165
 166 /* Current level for normal temporaries.  */
 167
 168 extern int temp_slot_level;
 169 \f
 170 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
 171 /* Structure to record the size of a sequence of arguments
 172    as the sum of a tree-expression and a constant.  */
 173
 174 struct args_size
 175 {
 176   HOST_WIDE_INT constant;
 177   tree var;
 178 };
 179 #endif
 180
 181 /* Add the value of the tree INC to the `struct args_size' TO.  */
 182
 183 #define ADD_PARM_SIZE(TO, INC)  \
 184 { tree inc = (INC);                             \
 185   if (TREE_CODE (inc) == INTEGER_CST)           \
 186     (TO).constant += TREE_INT_CST_LOW (inc);    \
 187   else if ((TO).var == 0)                       \
 188     (TO).var = inc;                             \
 189   else                                          \
 190     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 191
 192 #define SUB_PARM_SIZE(TO, DEC)  \
 193 { tree dec = (DEC);                             \
 194   if (TREE_CODE (dec) == INTEGER_CST)           \
 195     (TO).constant -= TREE_INT_CST_LOW (dec);    \
 196   else if ((TO).var == 0)                       \
 197     (TO).var = size_binop (MINUS_EXPR, integer_zero_node, dec); \
 198   else                                          \
 199     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 200
 201 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 202 #define ARGS_SIZE_RTX(SIZE)                                             \
 203 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)    \
 204  : expand_expr (size_binop (PLUS_EXPR, (SIZE).var,                      \
 205                             size_int ((SIZE).constant)),                \
 206                 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD))
 207
 208 /* Convert the implicit sum in a `struct args_size' into a tree.  */
 209 #define ARGS_SIZE_TREE(SIZE)                                            \
 210 ((SIZE).var == 0 ? size_int ((SIZE).constant)                           \
 211  : size_binop (PLUS_EXPR, (SIZE).var, size_int ((SIZE).constant)))
 212
 213 /* Supply a default definition for FUNCTION_ARG_PADDING:
 214    usually pad upward, but pad short args downward on
 215    big-endian machines.  */
 216
 217 enum direction {none, upward, downward};  /* Value has this type.  */
 218
 219 #ifndef FUNCTION_ARG_PADDING
 220 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 221   (! BYTES_BIG_ENDIAN                                                   \
 222    ? upward                                                             \
 223    : (((MODE) == BLKmode                                                \
 224        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 225           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 226        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 227       ? downward : upward))
 228 #endif
 229
 230 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 231    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 232    alignment.  */
 233
 234 #ifndef FUNCTION_ARG_BOUNDARY
 235 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 236 #endif
 237
 238 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 239 #ifndef STRICT_ARGUMENT_NAMING
 240 #define STRICT_ARGUMENT_NAMING 0
 241 #endif
 242
 243 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED.  */
 244 #ifdef SETUP_INCOMING_VARARGS
 245 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
 246 #define PRETEND_OUTGOING_VARARGS_NAMED 1
 247 #endif
 248 #else
 249 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
 250    defining SETUP_INCOMING_VARARGS.  */
 251 #define PRETEND_OUTGOING_VARARGS_NAMED 0
 252 #endif
 253
 254 /* Nonzero if we do not know how to pass TYPE solely in registers.
 255    We cannot do so in the following cases:
 256
 257    - if the type has variable size
 258    - if the type is marked as addressable (it is required to be constructed
 259      into the stack)
 260    - if the padding and mode of the type is such that a copy into a register
 261      would put it into the wrong part of the register.
 262
 263    Which padding can't be supported depends on the byte endianness.
 264
 265    A value in a register is implicitly padded at the most significant end.
 266    On a big-endian machine, that is the lower end in memory.
 267    So a value padded in memory at the upper end can't go in a register.
 268    For a little-endian machine, the reverse is true.  */
 269
 270 #ifndef MUST_PASS_IN_STACK
 271 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 272   ((TYPE) != 0                                          \
 273    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 274        || TREE_ADDRESSABLE (TYPE)                       \
 275        || ((MODE) == BLKmode                            \
 276            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 277                  && 0 == (int_size_in_bytes (TYPE)      \
 278                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 279            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 280                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 281 #endif
 282
 283 /* Nonzero if type TYPE should be returned in memory.
 284    Most machines can use the following default definition.  */
 285
 286 #ifndef RETURN_IN_MEMORY
 287 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 288 #endif
 289
 290 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 291    Normally move_insn, so Pmode stack pointer.  */
 292
 293 #ifndef STACK_SAVEAREA_MODE
 294 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 295 #endif
 296
 297 /* Supply a default definition of STACK_SIZE_MODE for
 298    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 299
 300 #ifndef STACK_SIZE_MODE
 301 #define STACK_SIZE_MODE word_mode
 302 #endif
 303
 304 /* Provide default values for the macros controlling stack checking.  */
 305
 306 #ifndef STACK_CHECK_BUILTIN
 307 #define STACK_CHECK_BUILTIN 0
 308 #endif
 309
 310 /* The default interval is one page.  */
 311 #ifndef STACK_CHECK_PROBE_INTERVAL
 312 #define STACK_CHECK_PROBE_INTERVAL 4096
 313 #endif
 314
 315 /* The default is to do a store into the stack.  */
 316 #ifndef STACK_CHECK_PROBE_LOAD
 317 #define STACK_CHECK_PROBE_LOAD 0
 318 #endif
 319
 320 /* This value is arbitrary, but should be sufficient for most machines.  */
 321 #ifndef STACK_CHECK_PROTECT
 322 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 323 #endif
 324
 325 /* Make the maximum frame size be the largest we can and still only need
 326    one probe per function.  */
 327 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 328 #define STACK_CHECK_MAX_FRAME_SIZE \
 329   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 330 #endif
 331
 332 /* This is arbitrary, but should be large enough everywhere.  */
 333 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 334 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 335 #endif
 336
 337 /* Provide a reasonable default for the maximum size of an object to
 338    allocate in the fixed frame.  We may need to be able to make this
 339    controllable by the user at some point.  */
 340 #ifndef STACK_CHECK_MAX_VAR_SIZE
 341 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 342 #endif
 343 \f
 344 /* Optabs are tables saying how to generate insn bodies
 345    for various machine modes and numbers of operands.
 346    Each optab applies to one operation.
 347    For example, add_optab applies to addition.
 348
 349    The insn_code slot is the enum insn_code that says how to
 350    generate an insn for this operation on a particular machine mode.
 351    It is CODE_FOR_nothing if there is no such insn on the target machine.
 352
 353    The `lib_call' slot is the name of the library function that
 354    can be used to perform the operation.
 355
 356    A few optabs, such as move_optab and cmp_optab, are used
 357    by special code.  */
 358
 359 /* Everything that uses expr.h needs to define enum insn_code
 360    but we don't list it in the Makefile dependencies just for that.  */
 361 #include "insn-codes.h"
 362
 363 typedef struct optab
 364 {
 365   enum rtx_code code;
 366   struct {
 367     enum insn_code insn_code;
 368     rtx libfunc;
 369   } handlers [NUM_MACHINE_MODES];
 370 } * optab;
 371
 372 /* Given an enum insn_code, access the function to construct
 373    the body of that kind of insn.  */
 374 #ifdef FUNCTION_CONVERSION_BUG
 375 /* Some compilers fail to convert a function properly to a
 376    pointer-to-function when used as an argument.
 377    So produce the pointer-to-function directly.
 378    Luckily, these compilers seem to work properly when you
 379    call the pointer-to-function.  */
 380 #define GEN_FCN(CODE) (insn_gen_function[(int) (CODE)])
 381 #else
 382 #define GEN_FCN(CODE) (*insn_gen_function[(int) (CODE)])
 383 #endif
 384
 385 extern rtx (*const insn_gen_function[]) PROTO ((rtx, ...));
 386
 387 extern optab add_optab;
 388 extern optab sub_optab;
 389 extern optab smul_optab;        /* Signed and floating-point multiply */
 390 extern optab smul_highpart_optab; /* Signed multiply, return high word */
 391 extern optab umul_highpart_optab;
 392 extern optab smul_widen_optab;  /* Signed multiply with result
 393                                    one machine mode wider than args */
 394 extern optab umul_widen_optab;
 395 extern optab sdiv_optab;        /* Signed divide */
 396 extern optab sdivmod_optab;     /* Signed divide-and-remainder in one */
 397 extern optab udiv_optab;
 398 extern optab udivmod_optab;
 399 extern optab smod_optab;        /* Signed remainder */
 400 extern optab umod_optab;
 401 extern optab flodiv_optab;      /* Optab for floating divide. */
 402 extern optab ftrunc_optab;      /* Convert float to integer in float fmt */
 403 extern optab and_optab;         /* Logical and */
 404 extern optab ior_optab;         /* Logical or */
 405 extern optab xor_optab;         /* Logical xor */
 406 extern optab ashl_optab;        /* Arithmetic shift left */
 407 extern optab ashr_optab;        /* Arithmetic shift right */
 408 extern optab lshr_optab;        /* Logical shift right */
 409 extern optab rotl_optab;        /* Rotate left */
 410 extern optab rotr_optab;        /* Rotate right */
 411 extern optab smin_optab;        /* Signed and floating-point minimum value */
 412 extern optab smax_optab;        /* Signed and floating-point maximum value */
 413 extern optab umin_optab;        /* Unsigned minimum value */
 414 extern optab umax_optab;        /* Unsigned maximum value */
 415
 416 extern optab mov_optab;         /* Move instruction.  */
 417 extern optab movstrict_optab;   /* Move, preserving high part of register.  */
 418
 419 extern optab cmp_optab;         /* Compare insn; two operands.  */
 420 extern optab tst_optab;         /* tst insn; compare one operand against 0 */
 421
 422 /* Unary operations */
 423 extern optab neg_optab;         /* Negation */
 424 extern optab abs_optab;         /* Abs value */
 425 extern optab one_cmpl_optab;    /* Bitwise not */
 426 extern optab ffs_optab;         /* Find first bit set */
 427 extern optab sqrt_optab;        /* Square root */
 428 extern optab sin_optab;         /* Sine */
 429 extern optab cos_optab;         /* Cosine */
 430 extern optab strlen_optab;      /* String length */
 431
 432 /* Tables of patterns for extending one integer mode to another.  */
 433 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 434
 435 /* Tables of patterns for converting between fixed and floating point. */
 436 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 437 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 438 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 439
 440 /* Contains the optab used for each rtx code.  */
 441 extern optab code_to_optab[NUM_RTX_CODE + 1];
 442
 443 /* Passed to expand_binop and expand_unop to say which options to try to use
 444    if the requested operation can't be open-coded on the requisite mode.
 445    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 446    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 447    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 448
 449 enum optab_methods
 450 {
 451   OPTAB_DIRECT,
 452   OPTAB_LIB,
 453   OPTAB_WIDEN,
 454   OPTAB_LIB_WIDEN,
 455   OPTAB_MUST_WIDEN
 456 };
 457
 458 /* SYMBOL_REF rtx's for the library functions that are called
 459    implicitly and not via optabs.  */
 460
 461 extern rtx extendsfdf2_libfunc;
 462 extern rtx extendsfxf2_libfunc;
 463 extern rtx extendsftf2_libfunc;
 464 extern rtx extenddfxf2_libfunc;
 465 extern rtx extenddftf2_libfunc;
 466
 467 extern rtx truncdfsf2_libfunc;
 468 extern rtx truncxfsf2_libfunc;
 469 extern rtx trunctfsf2_libfunc;
 470 extern rtx truncxfdf2_libfunc;
 471 extern rtx trunctfdf2_libfunc;
 472
 473 extern rtx memcpy_libfunc;
 474 extern rtx bcopy_libfunc;
 475 extern rtx memcmp_libfunc;
 476 extern rtx bcmp_libfunc;
 477 extern rtx memset_libfunc;
 478 extern rtx bzero_libfunc;
 479
 480 extern rtx throw_libfunc;
 481 extern rtx rethrow_libfunc;
 482 extern rtx sjthrow_libfunc;
 483 extern rtx sjpopnthrow_libfunc;
 484 extern rtx terminate_libfunc;
 485 extern rtx setjmp_libfunc;
 486 extern rtx longjmp_libfunc;
 487 extern rtx eh_rtime_match_libfunc;
 488
 489 extern rtx eqhf2_libfunc;
 490 extern rtx nehf2_libfunc;
 491 extern rtx gthf2_libfunc;
 492 extern rtx gehf2_libfunc;
 493 extern rtx lthf2_libfunc;
 494 extern rtx lehf2_libfunc;
 495
 496 extern rtx eqsf2_libfunc;
 497 extern rtx nesf2_libfunc;
 498 extern rtx gtsf2_libfunc;
 499 extern rtx gesf2_libfunc;
 500 extern rtx ltsf2_libfunc;
 501 extern rtx lesf2_libfunc;
 502
 503 extern rtx eqdf2_libfunc;
 504 extern rtx nedf2_libfunc;
 505 extern rtx gtdf2_libfunc;
 506 extern rtx gedf2_libfunc;
 507 extern rtx ltdf2_libfunc;
 508 extern rtx ledf2_libfunc;
 509
 510 extern rtx eqxf2_libfunc;
 511 extern rtx nexf2_libfunc;
 512 extern rtx gtxf2_libfunc;
 513 extern rtx gexf2_libfunc;
 514 extern rtx ltxf2_libfunc;
 515 extern rtx lexf2_libfunc;
 516
 517 extern rtx eqtf2_libfunc;
 518 extern rtx netf2_libfunc;
 519 extern rtx gttf2_libfunc;
 520 extern rtx getf2_libfunc;
 521 extern rtx lttf2_libfunc;
 522 extern rtx letf2_libfunc;
 523
 524 extern rtx floatsisf_libfunc;
 525 extern rtx floatdisf_libfunc;
 526 extern rtx floattisf_libfunc;
 527
 528 extern rtx floatsidf_libfunc;
 529 extern rtx floatdidf_libfunc;
 530 extern rtx floattidf_libfunc;
 531
 532 extern rtx floatsixf_libfunc;
 533 extern rtx floatdixf_libfunc;
 534 extern rtx floattixf_libfunc;
 535
 536 extern rtx floatsitf_libfunc;
 537 extern rtx floatditf_libfunc;
 538 extern rtx floattitf_libfunc;
 539
 540 extern rtx fixsfsi_libfunc;
 541 extern rtx fixsfdi_libfunc;
 542 extern rtx fixsfti_libfunc;
 543
 544 extern rtx fixdfsi_libfunc;
 545 extern rtx fixdfdi_libfunc;
 546 extern rtx fixdfti_libfunc;
 547
 548 extern rtx fixxfsi_libfunc;
 549 extern rtx fixxfdi_libfunc;
 550 extern rtx fixxfti_libfunc;
 551
 552 extern rtx fixtfsi_libfunc;
 553 extern rtx fixtfdi_libfunc;
 554 extern rtx fixtfti_libfunc;
 555
 556 extern rtx fixunssfsi_libfunc;
 557 extern rtx fixunssfdi_libfunc;
 558 extern rtx fixunssfti_libfunc;
 559
 560 extern rtx fixunsdfsi_libfunc;
 561 extern rtx fixunsdfdi_libfunc;
 562 extern rtx fixunsdfti_libfunc;
 563
 564 extern rtx fixunsxfsi_libfunc;
 565 extern rtx fixunsxfdi_libfunc;
 566 extern rtx fixunsxfti_libfunc;
 567
 568 extern rtx fixunstfsi_libfunc;
 569 extern rtx fixunstfdi_libfunc;
 570 extern rtx fixunstfti_libfunc;
 571
 572 /* For check-memory-usage.  */
 573 extern rtx chkr_check_addr_libfunc;
 574 extern rtx chkr_set_right_libfunc;
 575 extern rtx chkr_copy_bitmap_libfunc;
 576 extern rtx chkr_check_exec_libfunc;
 577 extern rtx chkr_check_str_libfunc;
 578
 579 /* For instrument-functions.  */
 580 extern rtx profile_function_entry_libfunc;
 581 extern rtx profile_function_exit_libfunc;
 582 \f
 583 typedef rtx (*rtxfun) PROTO ((rtx));
 584
 585 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 586    gives the gen_function to make a branch to test that condition.  */
 587
 588 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 589
 590 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 591    gives the insn code to make a store-condition insn
 592    to test that condition.  */
 593
 594 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 595
 596 #ifdef HAVE_conditional_move
 597 /* Indexed by the machine mode, gives the insn code to make a conditional
 598    move insn.  */
 599
 600 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 601 #endif
 602
 603 /* This array records the insn_code of insns to perform block moves.  */
 604 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 605
 606 /* This array records the insn_code of insns to perform block clears.  */
 607 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 608
 609 /* Define functions given in optabs.c.  */
 610
 611 /* Expand a binary operation given optab and rtx operands.  */
 612 extern rtx expand_binop PROTO((enum machine_mode, optab, rtx, rtx, rtx,
 613                                int, enum optab_methods));
 614
 615 /* Expand a binary operation with both signed and unsigned forms.  */
 616 extern rtx sign_expand_binop PROTO((enum machine_mode, optab, optab, rtx,
 617                                     rtx, rtx, int, enum optab_methods));
 618
 619 /* Generate code to perform an operation on two operands with two results.  */
 620 extern int expand_twoval_binop PROTO((optab, rtx, rtx, rtx, rtx, int));
 621
 622 /* Expand a unary arithmetic operation given optab rtx operand.  */
 623 extern rtx expand_unop PROTO((enum machine_mode, optab, rtx, rtx, int));
 624
 625 /* Expand the absolute value operation.  */
 626 extern rtx expand_abs PROTO((enum machine_mode, rtx, rtx, int));
 627
 628 /* Expand the complex absolute value operation.  */
 629 extern rtx expand_complex_abs PROTO((enum machine_mode, rtx, rtx, int));
 630
 631 /* Generate an instruction with a given INSN_CODE with an output and
 632    an input.  */
 633 extern void emit_unop_insn PROTO((int, rtx, rtx, enum rtx_code));
 634
 635 /* Emit code to perform a series of operations on a multi-word quantity, one
 636    word at a time.  */
 637 extern rtx emit_no_conflict_block PROTO((rtx, rtx, rtx, rtx, rtx));
 638
 639 /* Emit code to make a call to a constant function or a library call. */
 640 extern void emit_libcall_block PROTO((rtx, rtx, rtx, rtx));
 641
 642 /* Emit one rtl instruction to store zero in specified rtx.  */
 643 extern void emit_clr_insn PROTO((rtx));
 644
 645 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 646 extern void emit_0_to_1_insn PROTO((rtx));
 647
 648 /* Emit one rtl insn to compare two rtx's.  */
 649 extern void emit_cmp_insn PROTO((rtx, rtx, enum rtx_code, rtx,
 650                                  enum machine_mode, int, int));
 651
 652 /* Emit a pair of rtl insns to compare two rtx's and to jump
 653    to a label if the comparison is true.  */
 654 extern void emit_cmp_and_jump_insns PROTO((rtx, rtx, enum rtx_code, rtx,
 655                                            enum machine_mode, int, int, rtx));
 656
 657 /* Nonzero if a compare of mode MODE can be done straightforwardly
 658    (without splitting it into pieces).  */
 659 extern int can_compare_p PROTO((enum machine_mode));
 660
 661 /* Emit a library call comparison between floating point X and Y.
 662    COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.).  */
 663 extern void emit_float_lib_cmp PROTO((rtx, rtx, enum rtx_code));
 664
 665 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 666 extern void emit_indirect_jump PROTO((rtx));
 667
 668 #ifdef HAVE_conditional_move
 669 /* Emit a conditional move operation.  */
 670 rtx emit_conditional_move PROTO((rtx, enum rtx_code, rtx, rtx,
 671                                  enum machine_mode, rtx, rtx,
 672                                  enum machine_mode, int));
 673
 674 /* Return non-zero if the conditional move is supported.  */
 675 int can_conditionally_move_p PROTO((enum machine_mode mode));
 676
 677 #endif
 678
 679 /* Create but don't emit one rtl instruction to add one rtx into another.
 680    Modes must match; operands must meet the operation's predicates.
 681    Likewise for subtraction and for just copying.
 682    These do not call protect_from_queue; caller must do so.  */
 683 extern rtx gen_add2_insn PROTO((rtx, rtx));
 684 extern rtx gen_sub2_insn PROTO((rtx, rtx));
 685 extern rtx gen_move_insn PROTO((rtx, rtx));
 686 extern int have_add2_insn PROTO((enum machine_mode));
 687 extern int have_sub2_insn PROTO((enum machine_mode));
 688
 689 /* Return the INSN_CODE to use for an extend operation.  */
 690 extern enum insn_code can_extend_p PROTO((enum machine_mode,
 691                                           enum machine_mode, int));
 692
 693 /* Generate the body of an insn to extend Y (with mode MFROM)
 694    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 695 extern rtx gen_extend_insn PROTO((rtx, rtx, enum machine_mode,
 696                                   enum machine_mode, int));
 697
 698 /* Initialize the tables that control conversion between fixed and
 699    floating values.  */
 700 extern void init_fixtab PROTO((void));
 701 extern void init_floattab PROTO((void));
 702
 703 /* Generate code for a FLOAT_EXPR.  */
 704 extern void expand_float PROTO((rtx, rtx, int));
 705
 706 /* Generate code for a FIX_EXPR.  */
 707 extern void expand_fix PROTO((rtx, rtx, int));
 708
 709 /* Call this once to initialize the contents of the optabs
 710    appropriately for the current target machine.  */
 711 extern void init_optabs PROTO((void));
 712 \f
 713 /* Functions from expmed.c:  */
 714
 715 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 716    May emit insns.  */
 717 extern rtx negate_rtx PROTO((enum machine_mode, rtx));
 718
 719 /* Expand a logical AND operation.  */
 720 extern rtx expand_and PROTO((rtx, rtx, rtx));
 721
 722 /* Emit a store-flag operation.  */
 723 extern rtx emit_store_flag PROTO((rtx, enum rtx_code, rtx, rtx,
 724                                   enum machine_mode, int, int));
 725
 726 /* Like emit_store_flag, but always succeeds.  */
 727 extern rtx emit_store_flag_force PROTO((rtx, enum rtx_code, rtx, rtx,
 728                                         enum machine_mode, int, int));
 729
 730 /* Functions from loop.c:  */
 731
 732 /* Given a JUMP_INSN, return a description of the test being made.  */
 733 extern rtx get_condition PROTO((rtx, rtx *));
 734
 735 /* Generate a conditional trap instruction.  */
 736 extern rtx gen_cond_trap PROTO((enum rtx_code, rtx, rtx, rtx));
 737 \f
 738 /* Functions from builtins.c:  */
 739 #ifdef TREE_CODE
 740 extern rtx expand_builtin PROTO((tree, rtx, rtx, enum machine_mode, int));
 741 #endif
 742
 743 extern rtx expand_builtin_setjmp PROTO((rtx, rtx, rtx, rtx));
 744 \f
 745 /* Functions from expr.c:  */
 746
 747 /* This is run once per compilation to set up which modes can be used
 748    directly in memory and to initialize the block move optab.  */
 749 extern void init_expr_once PROTO((void));
 750
 751 /* This is run at the start of compiling a function.  */
 752 extern void init_expr PROTO((void));
 753
 754 /* Use protect_from_queue to convert a QUEUED expression
 755    into something that you can put immediately into an instruction.  */
 756 extern rtx protect_from_queue PROTO((rtx, int));
 757
 758 /* Perform all the pending incrementations.  */
 759 extern void emit_queue PROTO((void));
 760
 761 /* Tell if something has a queued subexpression.  */
 762 extern int queued_subexp_p PROTO((rtx));
 763
 764 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 765    Both modes must be floating or both fixed.  */
 766 extern void convert_move PROTO((rtx, rtx, int));
 767
 768 /* Convert an rtx to specified machine mode and return the result.  */
 769 extern rtx convert_to_mode PROTO((enum machine_mode, rtx, int));
 770
 771 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 772 extern rtx convert_modes PROTO((enum machine_mode, enum machine_mode, rtx, int));
 773
 774 /* Emit code to move a block Y to a block X.  */
 775 extern rtx emit_block_move PROTO((rtx, rtx, rtx, int));
 776
 777 /* Copy all or part of a value X into registers starting at REGNO.
 778    The number of registers to be filled is NREGS.  */
 779 extern void move_block_to_reg PROTO((int, rtx, int, enum machine_mode));
 780
 781 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 782    The number of registers to be filled is NREGS.  */
 783 extern void move_block_from_reg PROTO((int, rtx, int, int));
 784
 785 /* Load a BLKmode value into non-consecutive registers represented by a
 786    PARALLEL.  */
 787 extern void emit_group_load PROTO((rtx, rtx, int, int));
 788 /* Store a BLKmode value from non-consecutive registers represented by a
 789    PARALLEL.  */
 790 extern void emit_group_store PROTO((rtx, rtx, int, int));
 791
 792 #ifdef TREE_CODE
 793 /* Copy BLKmode object from a set of registers. */
 794 extern rtx copy_blkmode_from_reg PROTO((rtx,rtx,tree));
 795 #endif
 796
 797 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 798 extern void use_reg PROTO((rtx *, rtx));
 799 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 800    for the next CALL_INSN.  */
 801 extern void use_regs PROTO((rtx *, int, int));
 802 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 803 extern void use_group_regs PROTO((rtx *, rtx));
 804
 805 /* Write zeros through the storage of OBJECT.
 806    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 807    alignment.  */
 808 extern rtx clear_storage PROTO((rtx, rtx, int));
 809
 810 /* Emit insns to set X from Y.  */
 811 extern rtx emit_move_insn PROTO((rtx, rtx));
 812
 813 /* Emit insns to set X from Y, with no frills.  */
 814 extern rtx emit_move_insn_1 PROTO ((rtx, rtx));
 815
 816 /* Push a block of length SIZE (perhaps variable)
 817    and return an rtx to address the beginning of the block.  */
 818 extern rtx push_block PROTO((rtx, int, int));
 819
 820 /* Make an operand to push something on the stack.  */
 821 extern rtx gen_push_operand PROTO((void));
 822
 823 #ifdef TREE_CODE
 824 /* Generate code to push something onto the stack, given its mode and type.  */
 825 extern void emit_push_insn PROTO((rtx, enum machine_mode, tree, rtx, int,
 826                                   int, rtx, int, rtx, rtx, int));
 827
 828 /* Emit library call.  */
 829 extern void emit_library_call PVPROTO((rtx orgfun, int no_queue,
 830   enum machine_mode outmode, int nargs, ...));
 831 extern rtx emit_library_call_value PVPROTO((rtx orgfun, rtx value, int no_queue,
 832   enum machine_mode outmode, int nargs, ...));
 833
 834 /* Expand an assignment that stores the value of FROM into TO. */
 835 extern rtx expand_assignment PROTO((tree, tree, int, int));
 836
 837 /* Generate code for computing expression EXP,
 838    and storing the value into TARGET.
 839    If SUGGEST_REG is nonzero, copy the value through a register
 840    and return that register, if that is possible.  */
 841 extern rtx store_expr PROTO((tree, rtx, int));
 842 #endif
 843
 844 /* Given an rtx that may include add and multiply operations,
 845    generate them as insns and return a pseudo-reg containing the value.
 846    Useful after calling expand_expr with 1 as sum_ok.  */
 847 extern rtx force_operand PROTO((rtx, rtx));
 848
 849 #ifdef TREE_CODE
 850 /* Generate code for computing expression EXP.
 851    An rtx for the computed value is returned.  The value is never null.
 852    In the case of a void EXP, const0_rtx is returned.  */
 853 extern rtx expand_expr PROTO((tree, rtx, enum machine_mode,
 854                               enum expand_modifier));
 855 #endif
 856
 857 /* At the start of a function, record that we have no previously-pushed
 858    arguments waiting to be popped.  */
 859 extern void init_pending_stack_adjust PROTO((void));
 860
 861 /* When exiting from function, if safe, clear out any pending stack adjust
 862    so the adjustment won't get done.  */
 863 extern void clear_pending_stack_adjust PROTO((void));
 864
 865 /* Pop any previously-pushed arguments that have not been popped yet.  */
 866 extern void do_pending_stack_adjust PROTO((void));
 867
 868 #ifdef TREE_CODE
 869 /* Return the tree node and offset if a given argument corresponds to
 870    a string constant.  */
 871 extern tree string_constant PROTO((tree, tree *));
 872
 873 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
 874 extern void jumpifnot PROTO((tree, rtx));
 875
 876 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 877 extern void jumpif PROTO((tree, rtx));
 878
 879 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
 880    the result is zero, or IF_TRUE_LABEL if the result is one.  */
 881 extern void do_jump PROTO((tree, rtx, rtx));
 882 #endif
 883
 884 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
 885 extern rtx compare_from_rtx PROTO((rtx, rtx, enum rtx_code, int,
 886                                    enum machine_mode, rtx, int));
 887
 888 /* Generate a tablejump instruction (used for switch statements).  */
 889 extern void do_tablejump PROTO((rtx, enum machine_mode, rtx, rtx, rtx));
 890 \f
 891 #ifdef TREE_CODE
 892 /* rtl.h and tree.h were included.  */
 893 /* Return an rtx for the size in bytes of the value of an expr.  */
 894 extern rtx expr_size PROTO((tree));
 895
 896 extern rtx lookup_static_chain PROTO((tree));
 897
 898 /* Convert a stack slot address ADDR valid in function FNDECL
 899    into an address valid in this function (using a static chain).  */
 900 extern rtx fix_lexical_addr PROTO((rtx, tree));
 901
 902 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
 903 extern rtx trampoline_address PROTO((tree));
 904
 905 /* Return an rtx that refers to the value returned by a function
 906    in its original home.  This becomes invalid if any more code is emitted.  */
 907 extern rtx hard_function_value PROTO((tree, tree));
 908
 909 extern rtx prepare_call_address PROTO((rtx, tree, rtx *, int));
 910
 911 extern rtx expand_call PROTO((tree, rtx, int));
 912
 913 extern rtx expand_shift PROTO((enum tree_code, enum machine_mode, rtx, tree, rtx, int));
 914 extern rtx expand_divmod PROTO((int, enum tree_code, enum machine_mode, rtx, rtx, rtx, int));
 915 extern void locate_and_pad_parm PROTO((enum machine_mode, tree, int, tree, struct args_size *, struct args_size *, struct args_size *));
 916 extern rtx expand_inline_function PROTO((tree, tree, rtx, int, tree, rtx));
 917 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
 918 extern rtx label_rtx PROTO((tree));
 919 #endif
 920
 921 /* Indicate how an input argument register was promoted.  */
 922 extern rtx promoted_input_arg PROTO((int, enum machine_mode *, int *));
 923
 924 /* Return an rtx like arg but sans any constant terms.
 925    Returns the original rtx if it has no constant terms.
 926    The constant terms are added and stored via a second arg.  */
 927 extern rtx eliminate_constant_term PROTO((rtx, rtx *));
 928
 929 /* Convert arg to a valid memory address for specified machine mode,
 930    by emitting insns to perform arithmetic if nec.  */
 931 extern rtx memory_address PROTO((enum machine_mode, rtx));
 932
 933 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
 934 extern rtx memory_address_noforce PROTO((enum machine_mode, rtx));
 935
 936 /* Return a memory reference like MEMREF, but with its mode changed
 937    to MODE and its address changed to ADDR.
 938    (VOIDmode means don't change the mode.
 939    NULL for ADDR means don't change the address.)  */
 940 extern rtx change_address PROTO((rtx, enum machine_mode, rtx));
 941
 942 /* Return a memory reference like MEMREF, but which is known to have a
 943    valid address.  */
 944
 945 extern rtx validize_mem PROTO((rtx));
 946
 947 /* Assemble the static constant template for function entry trampolines.  */
 948 extern rtx assemble_trampoline_template PROTO((void));
 949
 950 /* Return 1 if two rtx's are equivalent in structure and elements.  */
 951 extern int rtx_equal_p PROTO((rtx, rtx));
 952
 953 /* Given rtx, return new rtx whose address won't be affected by
 954    any side effects.  It has been copied to a new temporary reg.  */
 955 extern rtx stabilize PROTO((rtx));
 956
 957 /* Given an rtx, copy all regs it refers to into new temps
 958    and return a modified copy that refers to the new temps.  */
 959 extern rtx copy_all_regs PROTO((rtx));
 960
 961 /* Copy given rtx to a new temp reg and return that.  */
 962 extern rtx copy_to_reg PROTO((rtx));
 963
 964 /* Like copy_to_reg but always make the reg Pmode.  */
 965 extern rtx copy_addr_to_reg PROTO((rtx));
 966
 967 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
 968 extern rtx copy_to_mode_reg PROTO((enum machine_mode, rtx));
 969
 970 /* Copy given rtx to given temp reg and return that.  */
 971 extern rtx copy_to_suggested_reg PROTO((rtx, rtx, enum machine_mode));
 972
 973 /* Copy a value to a register if it isn't already a register.
 974    Args are mode (in case value is a constant) and the value.  */
 975 extern rtx force_reg PROTO((enum machine_mode, rtx));
 976
 977 /* Return given rtx, copied into a new temp reg if it was in memory.  */
 978 extern rtx force_not_mem PROTO((rtx));
 979
 980 #ifdef TREE_CODE
 981 /* Return mode and signedness to use when object is promoted.  */
 982 extern enum machine_mode promote_mode PROTO((tree, enum machine_mode,
 983                                              int *, int));
 984 #endif
 985
 986 /* Remove some bytes from the stack.  An rtx says how many.  */
 987 extern void adjust_stack PROTO((rtx));
 988
 989 /* Add some bytes to the stack.  An rtx says how many.  */
 990 extern void anti_adjust_stack PROTO((rtx));
 991
 992 /* This enum is used for the following two functions.  */
 993 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
 994
 995 /* Save the stack pointer at the specified level.  */
 996 extern void emit_stack_save PROTO((enum save_level, rtx *, rtx));
 997
 998 /* Restore the stack pointer from a save area of the specified level.  */
 999 extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
1000
1001 /* Allocate some space on the stack dynamically and return its address.  An rtx
1002    says how many bytes.  */
1003 extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
1004
1005 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
1006    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
1007    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
1008    subtract from the stack.  If SIZE is constant, this is done
1009    with a fixed number of probes.  Otherwise, we must make a loop.  */
1010 extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
1011
1012 /* Return an rtx that refers to the value returned by a library call
1013    in its original home.  This becomes invalid if any more code is emitted.  */
1014 extern rtx hard_libcall_value PROTO((enum machine_mode));
1015
1016 /* Given an rtx, return an rtx for a value rounded up to a multiple
1017    of STACK_BOUNDARY / BITS_PER_UNIT.  */
1018 extern rtx round_push PROTO((rtx));
1019
1020 extern rtx store_bit_field PROTO((rtx, int, int, enum machine_mode, rtx, int, int));
1021 extern rtx extract_bit_field PROTO((rtx, int, int, int, rtx, enum machine_mode, enum machine_mode, int, int));
1022 extern rtx expand_mult PROTO((enum machine_mode, rtx, rtx, rtx, int));
1023 extern rtx expand_mult_add PROTO((rtx, rtx, rtx, rtx,enum machine_mode, int));
1024 extern rtx expand_mult_highpart_adjust PROTO((enum machine_mode, rtx, rtx, rtx, rtx, int));
1025
1026 extern rtx assemble_static_space PROTO((int));
1027
1028 /* Hook called by expand_expr for language-specific tree codes.
1029    It is up to the language front end to install a hook
1030    if it has any such codes that expand_expr needs to know about.  */
1031 extern rtx (*lang_expand_expr) PROTO ((union tree_node *, rtx,
1032                                        enum machine_mode,
1033                                        enum expand_modifier modifier));
1034
1035 #ifdef TREE_CODE
1036 /* Hook called by output_constant for language-specific tree codes.
1037    It is up to the language front-end to install a hook if it has any
1038    such codes that output_constant needs to know about.  Returns a
1039    language-independent constant equivalent to its input.  */
1040 extern tree (*lang_expand_constant) PROTO((tree));
1041 #endif
1042
1043 extern void init_all_optabs                     PROTO ((void));
1044 extern void init_mov_optab                      PROTO ((void));
1045 extern void do_jump_by_parts_equality_rtx       PROTO((rtx, rtx, rtx));
1046 extern void do_jump_by_parts_greater_rtx        PROTO ((enum machine_mode, int,
1047                                                         rtx, rtx, rtx, rtx));
1048
1049 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
1050 extern void mark_seen_cases                     PROTO ((tree, unsigned char *,
1051                                                         long, int));
1052 #endif