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