gcc/expr.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* The default branch cost is 1.  */
  23 #ifndef BRANCH_COST
  24 #define BRANCH_COST 1
  25 #endif
  26
  27 /* Macros to access the slots of a QUEUED rtx.
  28    Here rather than in rtl.h because only the expansion pass
  29    should ever encounter a QUEUED.  */
  30
  31 /* The variable for which an increment is queued.  */
  32 #define QUEUED_VAR(P) XEXP (P, 0)
  33 /* If the increment has been emitted, this is the insn
  34    that does the increment.  It is zero before the increment is emitted.
  35    If more than one insn is emitted, this is the first insn.  */
  36 #define QUEUED_INSN(P) XEXP (P, 1)
  37 /* If a pre-increment copy has been generated, this is the copy
  38    (it is a temporary reg).  Zero if no copy made yet.  */
  39 #define QUEUED_COPY(P) XEXP (P, 2)
  40 /* This is the body to use for the insn to do the increment.
  41    It is used to emit the increment.  */
  42 #define QUEUED_BODY(P) XEXP (P, 3)
  43 /* Next QUEUED in the queue.  */
  44 #define QUEUED_NEXT(P) XEXP (P, 4)
  45
  46 /* This is the 4th arg to `expand_expr'.
  47    EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
  48    EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
  49    EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
  50     is a constant that is not a legitimate address.
  51    EXPAND_MEMORY_USE_* are explained below.  */
  52 enum expand_modifier {EXPAND_NORMAL, EXPAND_SUM,
  53                       EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER,
  54                       EXPAND_MEMORY_USE_WO, EXPAND_MEMORY_USE_RW,
  55                       EXPAND_MEMORY_USE_BAD, EXPAND_MEMORY_USE_DONT};
  56
  57 /* Argument for chkr_* functions.
  58    MEMORY_USE_RO: the pointer reads memory.
  59    MEMORY_USE_WO: the pointer writes to memory.
  60    MEMORY_USE_RW: the pointer modifies memory (ie it reads and writes). An
  61                   example is (*ptr)++
  62    MEMORY_USE_BAD: use this if you don't know the behavior of the pointer, or
  63                    if you know there are no pointers.  Using an INDIRECT_REF
  64                    with MEMORY_USE_BAD will abort.
  65    MEMORY_USE_TW: just test for writing, without update.  Special.
  66    MEMORY_USE_DONT: the memory is neither read nor written.  This is used by
  67                    '->' and '.'.  */
  68 enum memory_use_mode {MEMORY_USE_BAD = 0, MEMORY_USE_RO = 1,
  69                       MEMORY_USE_WO = 2, MEMORY_USE_RW = 3,
  70                       MEMORY_USE_TW = 6, MEMORY_USE_DONT = 99};
  71
  72 /* Prevent the compiler from deferring stack pops.  See
  73    inhibit_defer_pop for more information.  */
  74 #define NO_DEFER_POP (inhibit_defer_pop += 1)
  75
  76 /* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
  77    more information.  */
  78 #define OK_DEFER_POP (inhibit_defer_pop -= 1)
  79 \f
  80 #ifdef TREE_CODE /* Don't lose if tree.h not included.  */
  81 /* Structure to record the size of a sequence of arguments
  82    as the sum of a tree-expression and a constant.  This structure is
  83    also used to store offsets from the stack, which might be negative,
  84    so the variable part must be ssizetype, not sizetype.  */
  85
  86 struct args_size
  87 {
  88   HOST_WIDE_INT constant;
  89   tree var;
  90 };
  91 #endif
  92
  93 /* Add the value of the tree INC to the `struct args_size' TO.  */
  94
  95 #define ADD_PARM_SIZE(TO, INC)  \
  96 { tree inc = (INC);                             \
  97   if (host_integerp (inc, 0))                   \
  98     (TO).constant += tree_low_cst (inc, 0);     \
  99   else if ((TO).var == 0)                       \
 100     (TO).var = inc;                             \
 101   else                                          \
 102     (TO).var = size_binop (PLUS_EXPR, (TO).var, inc); }
 103
 104 #define SUB_PARM_SIZE(TO, DEC)  \
 105 { tree dec = (DEC);                             \
 106   if (host_integerp (dec, 0))                   \
 107     (TO).constant -= tree_low_cst (dec, 0);     \
 108   else if ((TO).var == 0)                       \
 109     (TO).var = size_binop (MINUS_EXPR, ssize_int (0), dec); \
 110   else                                          \
 111     (TO).var = size_binop (MINUS_EXPR, (TO).var, dec); }
 112
 113 /* Convert the implicit sum in a `struct args_size' into a tree
 114    of type ssizetype.  */
 115 #define ARGS_SIZE_TREE(SIZE)                                    \
 116 ((SIZE).var == 0 ? ssize_int ((SIZE).constant)                  \
 117  : size_binop (PLUS_EXPR, (SIZE).var, ssize_int ((SIZE).constant)))
 118
 119 /* Convert the implicit sum in a `struct args_size' into an rtx.  */
 120 #define ARGS_SIZE_RTX(SIZE)                                     \
 121 ((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                    \
 122  : expand_expr (ARGS_SIZE_TREE (SIZE), NULL_RTX, VOIDmode,      \
 123                 EXPAND_MEMORY_USE_BAD))
 124
 125 /* Supply a default definition for FUNCTION_ARG_PADDING:
 126    usually pad upward, but pad short args downward on
 127    big-endian machines.  */
 128
 129 enum direction {none, upward, downward};  /* Value has this type.  */
 130
 131 #ifndef FUNCTION_ARG_PADDING
 132 #define FUNCTION_ARG_PADDING(MODE, TYPE)                                \
 133   (! BYTES_BIG_ENDIAN                                                   \
 134    ? upward                                                             \
 135    : (((MODE) == BLKmode                                                \
 136        ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
 137           && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
 138        : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
 139       ? downward : upward))
 140 #endif
 141
 142 /* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
 143    FUNCTION_ARG_PADDING, which also pads the length, handle any needed
 144    alignment.  */
 145
 146 #ifndef FUNCTION_ARG_BOUNDARY
 147 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
 148 #endif
 149
 150 /* Provide a default value for STRICT_ARGUMENT_NAMING.  */
 151 #ifndef STRICT_ARGUMENT_NAMING
 152 #define STRICT_ARGUMENT_NAMING 0
 153 #endif
 154
 155 /* Provide a default value for PRETEND_OUTGOING_VARARGS_NAMED.  */
 156 #ifdef SETUP_INCOMING_VARARGS
 157 #ifndef PRETEND_OUTGOING_VARARGS_NAMED
 158 #define PRETEND_OUTGOING_VARARGS_NAMED 1
 159 #endif
 160 #else
 161 /* It is an error to define PRETEND_OUTGOING_VARARGS_NAMED without
 162    defining SETUP_INCOMING_VARARGS.  */
 163 #define PRETEND_OUTGOING_VARARGS_NAMED 0
 164 #endif
 165
 166 /* Nonzero if we do not know how to pass TYPE solely in registers.
 167    We cannot do so in the following cases:
 168
 169    - if the type has variable size
 170    - if the type is marked as addressable (it is required to be constructed
 171      into the stack)
 172    - if the padding and mode of the type is such that a copy into a register
 173      would put it into the wrong part of the register.
 174
 175    Which padding can't be supported depends on the byte endianness.
 176
 177    A value in a register is implicitly padded at the most significant end.
 178    On a big-endian machine, that is the lower end in memory.
 179    So a value padded in memory at the upper end can't go in a register.
 180    For a little-endian machine, the reverse is true.  */
 181
 182 #ifndef MUST_PASS_IN_STACK
 183 #define MUST_PASS_IN_STACK(MODE,TYPE)                   \
 184   ((TYPE) != 0                                          \
 185    && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST      \
 186        || TREE_ADDRESSABLE (TYPE)                       \
 187        || ((MODE) == BLKmode                            \
 188            && ! ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
 189                  && 0 == (int_size_in_bytes (TYPE)      \
 190                           % (PARM_BOUNDARY / BITS_PER_UNIT))) \
 191            && (FUNCTION_ARG_PADDING (MODE, TYPE)        \
 192                == (BYTES_BIG_ENDIAN ? upward : downward)))))
 193 #endif
 194
 195 /* Nonzero if type TYPE should be returned in memory.
 196    Most machines can use the following default definition.  */
 197
 198 #ifndef RETURN_IN_MEMORY
 199 #define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
 200 #endif
 201
 202 /* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
 203    Normally move_insn, so Pmode stack pointer.  */
 204
 205 #ifndef STACK_SAVEAREA_MODE
 206 #define STACK_SAVEAREA_MODE(LEVEL) Pmode
 207 #endif
 208
 209 /* Supply a default definition of STACK_SIZE_MODE for
 210    allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
 211
 212 #ifndef STACK_SIZE_MODE
 213 #define STACK_SIZE_MODE word_mode
 214 #endif
 215
 216 /* Provide default values for the macros controlling stack checking.  */
 217
 218 #ifndef STACK_CHECK_BUILTIN
 219 #define STACK_CHECK_BUILTIN 0
 220 #endif
 221
 222 /* The default interval is one page.  */
 223 #ifndef STACK_CHECK_PROBE_INTERVAL
 224 #define STACK_CHECK_PROBE_INTERVAL 4096
 225 #endif
 226
 227 /* The default is to do a store into the stack.  */
 228 #ifndef STACK_CHECK_PROBE_LOAD
 229 #define STACK_CHECK_PROBE_LOAD 0
 230 #endif
 231
 232 /* This value is arbitrary, but should be sufficient for most machines.  */
 233 #ifndef STACK_CHECK_PROTECT
 234 #define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
 235 #endif
 236
 237 /* Make the maximum frame size be the largest we can and still only need
 238    one probe per function.  */
 239 #ifndef STACK_CHECK_MAX_FRAME_SIZE
 240 #define STACK_CHECK_MAX_FRAME_SIZE \
 241   (STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
 242 #endif
 243
 244 /* This is arbitrary, but should be large enough everywhere.  */
 245 #ifndef STACK_CHECK_FIXED_FRAME_SIZE
 246 #define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
 247 #endif
 248
 249 /* Provide a reasonable default for the maximum size of an object to
 250    allocate in the fixed frame.  We may need to be able to make this
 251    controllable by the user at some point.  */
 252 #ifndef STACK_CHECK_MAX_VAR_SIZE
 253 #define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
 254 #endif
 255 \f
 256 /* Optabs are tables saying how to generate insn bodies
 257    for various machine modes and numbers of operands.
 258    Each optab applies to one operation.
 259    For example, add_optab applies to addition.
 260
 261    The insn_code slot is the enum insn_code that says how to
 262    generate an insn for this operation on a particular machine mode.
 263    It is CODE_FOR_nothing if there is no such insn on the target machine.
 264
 265    The `lib_call' slot is the name of the library function that
 266    can be used to perform the operation.
 267
 268    A few optabs, such as move_optab and cmp_optab, are used
 269    by special code.  */
 270
 271 typedef struct optab
 272 {
 273   enum rtx_code code;
 274   struct {
 275     enum insn_code insn_code;
 276     rtx libfunc;
 277   } handlers [NUM_MACHINE_MODES];
 278 } * optab;
 279
 280 /* Given an enum insn_code, access the function to construct
 281    the body of that kind of insn.  */
 282 #ifdef FUNCTION_CONVERSION_BUG
 283 /* Some compilers fail to convert a function properly to a
 284    pointer-to-function when used as an argument.
 285    So produce the pointer-to-function directly.
 286    Luckily, these compilers seem to work properly when you
 287    call the pointer-to-function.  */
 288 #define GEN_FCN(CODE) (insn_data[(int) (CODE)].genfun)
 289 #else
 290 #define GEN_FCN(CODE) (*insn_data[(int) (CODE)].genfun)
 291 #endif
 292
 293 /* Enumeration of valid indexes into optab_table.  */
 294 enum optab_index
 295 {
 296   OTI_add,
 297   OTI_addv,
 298   OTI_sub,
 299   OTI_subv,
 300
 301   /* Signed and fp multiply */
 302   OTI_smul,
 303   OTI_smulv,
 304   /* Signed multiply, return high word */
 305   OTI_smul_highpart,
 306   OTI_umul_highpart,
 307   /* Signed multiply with result one machine mode wider than args */
 308   OTI_smul_widen,
 309   OTI_umul_widen,
 310
 311   /* Signed divide */
 312   OTI_sdiv,
 313   OTI_sdivv,
 314   /* Signed divide-and-remainder in one */
 315   OTI_sdivmod,
 316   OTI_udiv,
 317   OTI_udivmod,
 318   /* Signed remainder */
 319   OTI_smod,
 320   OTI_umod,
 321   /* Optab for floating divide. */
 322   OTI_flodiv,
 323   /* Convert float to integer in float fmt */
 324   OTI_ftrunc,
 325
 326   /* Logical and */
 327   OTI_and,
 328   /* Logical or */
 329   OTI_ior,
 330   /* Logical xor */
 331   OTI_xor,
 332
 333   /* Arithmetic shift left */
 334   OTI_ashl,
 335   /* Logical shift right */
 336   OTI_lshr,
 337   /* Arithmetic shift right */
 338   OTI_ashr,
 339   /* Rotate left */
 340   OTI_rotl,
 341   /* Rotate right */
 342   OTI_rotr,
 343   /* Signed and floating-point minimum value */
 344   OTI_smin,
 345   /* Signed and floating-point maximum value */
 346   OTI_smax,
 347   /* Unsigned minimum value */
 348   OTI_umin,
 349   /* Unsigned maximum value */
 350   OTI_umax,
 351
 352   /* Move instruction.  */
 353   OTI_mov,
 354   /* Move, preserving high part of register.  */
 355   OTI_movstrict,
 356
 357   /* Unary operations */
 358   /* Negation */
 359   OTI_neg,
 360   OTI_negv,
 361   /* Abs value */
 362   OTI_abs,
 363   OTI_absv,
 364   /* Bitwise not */
 365   OTI_one_cmpl,
 366   /* Find first bit set */
 367   OTI_ffs,
 368   /* Square root */
 369   OTI_sqrt,
 370   /* Sine */
 371   OTI_sin,
 372   /* Cosine */
 373   OTI_cos,
 374
 375   /* Compare insn; two operands.  */
 376   OTI_cmp,
 377   /* Used only for libcalls for unsigned comparisons.  */
 378   OTI_ucmp,
 379   /* tst insn; compare one operand against 0 */
 380   OTI_tst,
 381
 382   /* String length */
 383   OTI_strlen,
 384
 385   /* Combined compare & jump/store flags/move operations.  */
 386   OTI_cbranch,
 387   OTI_cmov,
 388   OTI_cstore,
 389
 390   OTI_MAX
 391 };
 392
 393 extern optab optab_table[OTI_MAX];
 394
 395 #define add_optab (optab_table[OTI_add])
 396 #define sub_optab (optab_table[OTI_sub])
 397 #define smul_optab (optab_table[OTI_smul])
 398 #define addv_optab (optab_table[OTI_addv])
 399 #define subv_optab (optab_table[OTI_subv])
 400 #define smul_highpart_optab (optab_table[OTI_smul_highpart])
 401 #define umul_highpart_optab (optab_table[OTI_umul_highpart])
 402 #define smul_widen_optab (optab_table[OTI_smul_widen])
 403 #define umul_widen_optab (optab_table[OTI_umul_widen])
 404 #define sdiv_optab (optab_table[OTI_sdiv])
 405 #define smulv_optab (optab_table[OTI_smulv])
 406 #define sdivv_optab (optab_table[OTI_sdivv])
 407 #define sdivmod_optab (optab_table[OTI_sdivmod])
 408 #define udiv_optab (optab_table[OTI_udiv])
 409 #define udivmod_optab (optab_table[OTI_udivmod])
 410 #define smod_optab (optab_table[OTI_smod])
 411 #define umod_optab (optab_table[OTI_umod])
 412 #define flodiv_optab (optab_table[OTI_flodiv])
 413 #define ftrunc_optab (optab_table[OTI_ftrunc])
 414 #define and_optab (optab_table[OTI_and])
 415 #define ior_optab (optab_table[OTI_ior])
 416 #define xor_optab (optab_table[OTI_xor])
 417 #define ashl_optab (optab_table[OTI_ashl])
 418 #define lshr_optab (optab_table[OTI_lshr])
 419 #define ashr_optab (optab_table[OTI_ashr])
 420 #define rotl_optab (optab_table[OTI_rotl])
 421 #define rotr_optab (optab_table[OTI_rotr])
 422 #define smin_optab (optab_table[OTI_smin])
 423 #define smax_optab (optab_table[OTI_smax])
 424 #define umin_optab (optab_table[OTI_umin])
 425 #define umax_optab (optab_table[OTI_umax])
 426
 427 #define mov_optab (optab_table[OTI_mov])
 428 #define movstrict_optab (optab_table[OTI_movstrict])
 429
 430 #define neg_optab (optab_table[OTI_neg])
 431 #define negv_optab (optab_table[OTI_negv])
 432 #define abs_optab (optab_table[OTI_abs])
 433 #define absv_optab (optab_table[OTI_absv])
 434 #define one_cmpl_optab (optab_table[OTI_one_cmpl])
 435 #define ffs_optab (optab_table[OTI_ffs])
 436 #define sqrt_optab (optab_table[OTI_sqrt])
 437 #define sin_optab (optab_table[OTI_sin])
 438 #define cos_optab (optab_table[OTI_cos])
 439
 440 #define cmp_optab (optab_table[OTI_cmp])
 441 #define ucmp_optab (optab_table[OTI_ucmp])
 442 #define tst_optab (optab_table[OTI_tst])
 443
 444 #define strlen_optab (optab_table[OTI_strlen])
 445
 446 #define cbranch_optab (optab_table[OTI_cbranch])
 447 #define cmov_optab (optab_table[OTI_cmov])
 448 #define cstore_optab (optab_table[OTI_cstore])
 449
 450 /* Tables of patterns for extending one integer mode to another.  */
 451 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 452
 453 /* Tables of patterns for converting between fixed and floating point. */
 454 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 455 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 456 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 457
 458 /* Contains the optab used for each rtx code.  */
 459 extern optab code_to_optab[NUM_RTX_CODE + 1];
 460
 461 /* Passed to expand_binop and expand_unop to say which options to try to use
 462    if the requested operation can't be open-coded on the requisite mode.
 463    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 464    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 465    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 466
 467 enum optab_methods
 468 {
 469   OPTAB_DIRECT,
 470   OPTAB_LIB,
 471   OPTAB_WIDEN,
 472   OPTAB_LIB_WIDEN,
 473   OPTAB_MUST_WIDEN
 474 };
 475
 476 /* Enumeration of indexes into libfunc_table.  */
 477 enum libfunc_index
 478 {
 479   LTI_extendsfdf2,
 480   LTI_extendsfxf2,
 481   LTI_extendsftf2,
 482   LTI_extenddfxf2,
 483   LTI_extenddftf2,
 484
 485   LTI_truncdfsf2,
 486   LTI_truncxfsf2,
 487   LTI_trunctfsf2,
 488   LTI_truncxfdf2,
 489   LTI_trunctfdf2,
 490
 491   LTI_memcpy,
 492   LTI_bcopy,
 493   LTI_memcmp,
 494   LTI_bcmp,
 495   LTI_memset,
 496   LTI_bzero,
 497
 498   LTI_throw,
 499   LTI_rethrow,
 500   LTI_sjthrow,
 501   LTI_sjpopnthrow,
 502   LTI_terminate,
 503   LTI_setjmp,
 504   LTI_longjmp,
 505   LTI_eh_rtime_match,
 506
 507   LTI_eqhf2,
 508   LTI_nehf2,
 509   LTI_gthf2,
 510   LTI_gehf2,
 511   LTI_lthf2,
 512   LTI_lehf2,
 513   LTI_unordhf2,
 514
 515   LTI_eqsf2,
 516   LTI_nesf2,
 517   LTI_gtsf2,
 518   LTI_gesf2,
 519   LTI_ltsf2,
 520   LTI_lesf2,
 521   LTI_unordsf2,
 522
 523   LTI_eqdf2,
 524   LTI_nedf2,
 525   LTI_gtdf2,
 526   LTI_gedf2,
 527   LTI_ltdf2,
 528   LTI_ledf2,
 529   LTI_unorddf2,
 530
 531   LTI_eqxf2,
 532   LTI_nexf2,
 533   LTI_gtxf2,
 534   LTI_gexf2,
 535   LTI_ltxf2,
 536   LTI_lexf2,
 537   LTI_unordxf2,
 538
 539   LTI_eqtf2,
 540   LTI_netf2,
 541   LTI_gttf2,
 542   LTI_getf2,
 543   LTI_lttf2,
 544   LTI_letf2,
 545   LTI_unordtf2,
 546
 547   LTI_floatsisf,
 548   LTI_floatdisf,
 549   LTI_floattisf,
 550
 551   LTI_floatsidf,
 552   LTI_floatdidf,
 553   LTI_floattidf,
 554
 555   LTI_floatsixf,
 556   LTI_floatdixf,
 557   LTI_floattixf,
 558
 559   LTI_floatsitf,
 560   LTI_floatditf,
 561   LTI_floattitf,
 562
 563   LTI_fixsfsi,
 564   LTI_fixsfdi,
 565   LTI_fixsfti,
 566
 567   LTI_fixdfsi,
 568   LTI_fixdfdi,
 569   LTI_fixdfti,
 570
 571   LTI_fixxfsi,
 572   LTI_fixxfdi,
 573   LTI_fixxfti,
 574
 575   LTI_fixtfsi,
 576   LTI_fixtfdi,
 577   LTI_fixtfti,
 578
 579   LTI_fixunssfsi,
 580   LTI_fixunssfdi,
 581   LTI_fixunssfti,
 582
 583   LTI_fixunsdfsi,
 584   LTI_fixunsdfdi,
 585   LTI_fixunsdfti,
 586
 587   LTI_fixunsxfsi,
 588   LTI_fixunsxfdi,
 589   LTI_fixunsxfti,
 590
 591   LTI_fixunstfsi,
 592   LTI_fixunstfdi,
 593   LTI_fixunstfti,
 594
 595   LTI_chkr_check_addr,
 596   LTI_chkr_set_right,
 597   LTI_chkr_copy_bitmap,
 598   LTI_chkr_check_exec,
 599   LTI_chkr_check_str,
 600
 601   LTI_profile_function_entry,
 602   LTI_profile_function_exit,
 603
 604   LTI_MAX
 605 };
 606
 607 /* SYMBOL_REF rtx's for the library functions that are called
 608    implicitly and not via optabs.  */
 609 extern rtx libfunc_table[LTI_MAX];
 610
 611 /* Accessor macros for libfunc_table.  */
 612 #define extendsfdf2_libfunc     (libfunc_table[LTI_extendsfdf2])
 613 #define extendsfxf2_libfunc     (libfunc_table[LTI_extendsfxf2])
 614 #define extendsftf2_libfunc     (libfunc_table[LTI_extendsftf2])
 615 #define extenddfxf2_libfunc     (libfunc_table[LTI_extenddfxf2])
 616 #define extenddftf2_libfunc     (libfunc_table[LTI_extenddftf2])
 617
 618 #define truncdfsf2_libfunc      (libfunc_table[LTI_truncdfsf2])
 619 #define truncxfsf2_libfunc      (libfunc_table[LTI_truncxfsf2])
 620 #define trunctfsf2_libfunc      (libfunc_table[LTI_trunctfsf2])
 621 #define truncxfdf2_libfunc      (libfunc_table[LTI_truncxfdf2])
 622 #define trunctfdf2_libfunc      (libfunc_table[LTI_trunctfdf2])
 623
 624 #define memcpy_libfunc  (libfunc_table[LTI_memcpy])
 625 #define bcopy_libfunc   (libfunc_table[LTI_bcopy])
 626 #define memcmp_libfunc  (libfunc_table[LTI_memcmp])
 627 #define bcmp_libfunc    (libfunc_table[LTI_bcmp])
 628 #define memset_libfunc  (libfunc_table[LTI_memset])
 629 #define bzero_libfunc   (libfunc_table[LTI_bzero])
 630
 631 #define throw_libfunc   (libfunc_table[LTI_throw])
 632 #define rethrow_libfunc (libfunc_table[LTI_rethrow])
 633 #define sjthrow_libfunc (libfunc_table[LTI_sjthrow])
 634 #define sjpopnthrow_libfunc     (libfunc_table[LTI_sjpopnthrow])
 635 #define terminate_libfunc       (libfunc_table[LTI_terminate])
 636 #define setjmp_libfunc  (libfunc_table[LTI_setjmp])
 637 #define longjmp_libfunc (libfunc_table[LTI_longjmp])
 638 #define eh_rtime_match_libfunc  (libfunc_table[LTI_eh_rtime_match])
 639
 640 #define eqhf2_libfunc   (libfunc_table[LTI_eqhf2])
 641 #define nehf2_libfunc   (libfunc_table[LTI_nehf2])
 642 #define gthf2_libfunc   (libfunc_table[LTI_gthf2])
 643 #define gehf2_libfunc   (libfunc_table[LTI_gehf2])
 644 #define lthf2_libfunc   (libfunc_table[LTI_lthf2])
 645 #define lehf2_libfunc   (libfunc_table[LTI_lehf2])
 646 #define unordhf2_libfunc        (libfunc_table[LTI_unordhf2])
 647
 648 #define eqsf2_libfunc   (libfunc_table[LTI_eqsf2])
 649 #define nesf2_libfunc   (libfunc_table[LTI_nesf2])
 650 #define gtsf2_libfunc   (libfunc_table[LTI_gtsf2])
 651 #define gesf2_libfunc   (libfunc_table[LTI_gesf2])
 652 #define ltsf2_libfunc   (libfunc_table[LTI_ltsf2])
 653 #define lesf2_libfunc   (libfunc_table[LTI_lesf2])
 654 #define unordsf2_libfunc        (libfunc_table[LTI_unordsf2])
 655
 656 #define eqdf2_libfunc   (libfunc_table[LTI_eqdf2])
 657 #define nedf2_libfunc   (libfunc_table[LTI_nedf2])
 658 #define gtdf2_libfunc   (libfunc_table[LTI_gtdf2])
 659 #define gedf2_libfunc   (libfunc_table[LTI_gedf2])
 660 #define ltdf2_libfunc   (libfunc_table[LTI_ltdf2])
 661 #define ledf2_libfunc   (libfunc_table[LTI_ledf2])
 662 #define unorddf2_libfunc        (libfunc_table[LTI_unorddf2])
 663
 664 #define eqxf2_libfunc   (libfunc_table[LTI_eqxf2])
 665 #define nexf2_libfunc   (libfunc_table[LTI_nexf2])
 666 #define gtxf2_libfunc   (libfunc_table[LTI_gtxf2])
 667 #define gexf2_libfunc   (libfunc_table[LTI_gexf2])
 668 #define ltxf2_libfunc   (libfunc_table[LTI_ltxf2])
 669 #define lexf2_libfunc   (libfunc_table[LTI_lexf2])
 670 #define unordxf2_libfunc        (libfunc_table[LTI_unordxf2])
 671
 672 #define eqtf2_libfunc   (libfunc_table[LTI_eqtf2])
 673 #define netf2_libfunc   (libfunc_table[LTI_netf2])
 674 #define gttf2_libfunc   (libfunc_table[LTI_gttf2])
 675 #define getf2_libfunc   (libfunc_table[LTI_getf2])
 676 #define lttf2_libfunc   (libfunc_table[LTI_lttf2])
 677 #define letf2_libfunc   (libfunc_table[LTI_letf2])
 678 #define unordtf2_libfunc        (libfunc_table[LTI_unordtf2])
 679
 680 #define floatsisf_libfunc       (libfunc_table[LTI_floatsisf])
 681 #define floatdisf_libfunc       (libfunc_table[LTI_floatdisf])
 682 #define floattisf_libfunc       (libfunc_table[LTI_floattisf])
 683
 684 #define floatsidf_libfunc       (libfunc_table[LTI_floatsidf])
 685 #define floatdidf_libfunc       (libfunc_table[LTI_floatdidf])
 686 #define floattidf_libfunc       (libfunc_table[LTI_floattidf])
 687
 688 #define floatsixf_libfunc       (libfunc_table[LTI_floatsixf])
 689 #define floatdixf_libfunc       (libfunc_table[LTI_floatdixf])
 690 #define floattixf_libfunc       (libfunc_table[LTI_floattixf])
 691
 692 #define floatsitf_libfunc       (libfunc_table[LTI_floatsitf])
 693 #define floatditf_libfunc       (libfunc_table[LTI_floatditf])
 694 #define floattitf_libfunc       (libfunc_table[LTI_floattitf])
 695
 696 #define fixsfsi_libfunc (libfunc_table[LTI_fixsfsi])
 697 #define fixsfdi_libfunc (libfunc_table[LTI_fixsfdi])
 698 #define fixsfti_libfunc (libfunc_table[LTI_fixsfti])
 699
 700 #define fixdfsi_libfunc (libfunc_table[LTI_fixdfsi])
 701 #define fixdfdi_libfunc (libfunc_table[LTI_fixdfdi])
 702 #define fixdfti_libfunc (libfunc_table[LTI_fixdfti])
 703
 704 #define fixxfsi_libfunc (libfunc_table[LTI_fixxfsi])
 705 #define fixxfdi_libfunc (libfunc_table[LTI_fixxfdi])
 706 #define fixxfti_libfunc (libfunc_table[LTI_fixxfti])
 707
 708 #define fixtfsi_libfunc (libfunc_table[LTI_fixtfsi])
 709 #define fixtfdi_libfunc (libfunc_table[LTI_fixtfdi])
 710 #define fixtfti_libfunc (libfunc_table[LTI_fixtfti])
 711
 712 #define fixunssfsi_libfunc      (libfunc_table[LTI_fixunssfsi])
 713 #define fixunssfdi_libfunc      (libfunc_table[LTI_fixunssfdi])
 714 #define fixunssfti_libfunc      (libfunc_table[LTI_fixunssfti])
 715
 716 #define fixunsdfsi_libfunc      (libfunc_table[LTI_fixunsdfsi])
 717 #define fixunsdfdi_libfunc      (libfunc_table[LTI_fixunsdfdi])
 718 #define fixunsdfti_libfunc      (libfunc_table[LTI_fixunsdfti])
 719
 720 #define fixunsxfsi_libfunc      (libfunc_table[LTI_fixunsxfsi])
 721 #define fixunsxfdi_libfunc      (libfunc_table[LTI_fixunsxfdi])
 722 #define fixunsxfti_libfunc      (libfunc_table[LTI_fixunsxfti])
 723
 724 #define fixunstfsi_libfunc      (libfunc_table[LTI_fixunstfsi])
 725 #define fixunstfdi_libfunc      (libfunc_table[LTI_fixunstfdi])
 726 #define fixunstfti_libfunc      (libfunc_table[LTI_fixunstfti])
 727
 728 #define chkr_check_addr_libfunc (libfunc_table[LTI_chkr_check_addr])
 729 #define chkr_set_right_libfunc  (libfunc_table[LTI_chkr_set_right])
 730 #define chkr_copy_bitmap_libfunc        (libfunc_table[LTI_chkr_copy_bitmap])
 731 #define chkr_check_exec_libfunc (libfunc_table[LTI_chkr_check_exec])
 732 #define chkr_check_str_libfunc  (libfunc_table[LTI_chkr_check_str])
 733
 734 #define profile_function_entry_libfunc  (libfunc_table[LTI_profile_function_entry])
 735 #define profile_function_exit_libfunc   (libfunc_table[LTI_profile_function_exit])
 736 \f
 737 typedef rtx (*rtxfun) PARAMS ((rtx));
 738
 739 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 740    gives the gen_function to make a branch to test that condition.  */
 741
 742 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 743
 744 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 745    gives the insn code to make a store-condition insn
 746    to test that condition.  */
 747
 748 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 749
 750 #ifdef HAVE_conditional_move
 751 /* Indexed by the machine mode, gives the insn code to make a conditional
 752    move insn.  */
 753
 754 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 755 #endif
 756
 757 /* This array records the insn_code of insns to perform block moves.  */
 758 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 759
 760 /* This array records the insn_code of insns to perform block clears.  */
 761 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 762
 763 /* Define functions given in optabs.c.  */
 764
 765 /* Expand a binary operation given optab and rtx operands.  */
 766 extern rtx expand_binop PARAMS ((enum machine_mode, optab, rtx, rtx, rtx,
 767                                  int, enum optab_methods));
 768
 769 /* Expand a binary operation with both signed and unsigned forms.  */
 770 extern rtx sign_expand_binop PARAMS ((enum machine_mode, optab, optab, rtx,
 771                                       rtx, rtx, int, enum optab_methods));
 772
 773 /* Generate code to perform an operation on two operands with two results.  */
 774 extern int expand_twoval_binop PARAMS ((optab, rtx, rtx, rtx, rtx, int));
 775
 776 /* Expand a unary arithmetic operation given optab rtx operand.  */
 777 extern rtx expand_unop PARAMS ((enum machine_mode, optab, rtx, rtx, int));
 778
 779 /* Expand the absolute value operation.  */
 780 extern rtx expand_abs PARAMS ((enum machine_mode, rtx, rtx, int, int));
 781
 782 /* Expand the complex absolute value operation.  */
 783 extern rtx expand_complex_abs PARAMS ((enum machine_mode, rtx, rtx, int));
 784
 785 /* Generate an instruction with a given INSN_CODE with an output and
 786    an input.  */
 787 extern void emit_unop_insn PARAMS ((int, rtx, rtx, enum rtx_code));
 788
 789 /* Emit code to perform a series of operations on a multi-word quantity, one
 790    word at a time.  */
 791 extern rtx emit_no_conflict_block PARAMS ((rtx, rtx, rtx, rtx, rtx));
 792
 793 /* Emit code to make a call to a constant function or a library call. */
 794 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
 795
 796 /* Emit one rtl instruction to store zero in specified rtx.  */
 797 extern void emit_clr_insn PARAMS ((rtx));
 798
 799 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 800 extern void emit_0_to_1_insn PARAMS ((rtx));
 801
 802 /* Emit one rtl insn to compare two rtx's.  */
 803 extern void emit_cmp_insn PARAMS ((rtx, rtx, enum rtx_code, rtx,
 804                                    enum machine_mode, int, unsigned int));
 805
 806 /* Emit a pair of rtl insns to compare two rtx's and to jump
 807    to a label if the comparison is true.  */
 808 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
 809                                              enum machine_mode, int,
 810                                              unsigned int, rtx));
 811
 812 /* The various uses that a comparison can have; used by can_compare_p:
 813    jumps, conditional moves, store flag operations.  */
 814 enum can_compare_purpose
 815 {
 816   ccp_jump,
 817   ccp_cmov,
 818   ccp_store_flag
 819 };
 820
 821 /* Nonzero if a compare of mode MODE can be done straightforwardly
 822    (without splitting it into pieces).  */
 823 extern int can_compare_p PARAMS ((enum rtx_code, enum machine_mode,
 824                                   enum can_compare_purpose));
 825
 826 extern void prepare_cmp_insn PARAMS ((rtx *, rtx *, enum rtx_code *, rtx,
 827                                       enum machine_mode *, int *, int,
 828                                       enum can_compare_purpose));
 829
 830 extern rtx prepare_operand PARAMS ((int, rtx, int, enum machine_mode,
 831                                     enum machine_mode, int));
 832
 833 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 834 extern void emit_indirect_jump PARAMS ((rtx));
 835
 836 #ifdef HAVE_conditional_move
 837 /* Emit a conditional move operation.  */
 838 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
 839                                    enum machine_mode, rtx, rtx,
 840                                    enum machine_mode, int));
 841
 842 /* Return non-zero if the conditional move is supported.  */
 843 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
 844
 845 #endif
 846
 847 /* Create but don't emit one rtl instruction to add one rtx into another.
 848    Modes must match; operands must meet the operation's predicates.
 849    Likewise for subtraction and for just copying.
 850    These do not call protect_from_queue; caller must do so.  */
 851 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
 852 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
 853 extern rtx gen_move_insn PARAMS ((rtx, rtx));
 854 extern int have_add2_insn PARAMS ((enum machine_mode));
 855 extern int have_sub2_insn PARAMS ((enum machine_mode));
 856
 857 /* Return the INSN_CODE to use for an extend operation.  */
 858 extern enum insn_code can_extend_p PARAMS ((enum machine_mode,
 859                                             enum machine_mode, int));
 860
 861 /* Generate the body of an insn to extend Y (with mode MFROM)
 862    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 863 extern rtx gen_extend_insn PARAMS ((rtx, rtx, enum machine_mode,
 864                                     enum machine_mode, int));
 865
 866 /* Initialize the tables that control conversion between fixed and
 867    floating values.  */
 868 extern void init_fixtab PARAMS ((void));
 869 extern void init_floattab PARAMS ((void));
 870
 871 /* Generate code for a FLOAT_EXPR.  */
 872 extern void expand_float PARAMS ((rtx, rtx, int));
 873
 874 /* Generate code for a FIX_EXPR.  */
 875 extern void expand_fix PARAMS ((rtx, rtx, int));
 876
 877 /* Call this to initialize an optab function entry.  */
 878 extern rtx init_one_libfunc PARAMS ((const char *));
 879
 880 /* Call this once to initialize the contents of the optabs
 881    appropriately for the current target machine.  */
 882 extern void init_optabs PARAMS ((void));
 883 \f
 884 /* Functions from expmed.c:  */
 885
 886 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 887    May emit insns.  */
 888 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
 889
 890 /* Expand a logical AND operation.  */
 891 extern rtx expand_and PARAMS ((rtx, rtx, rtx));
 892
 893 /* Emit a store-flag operation.  */
 894 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
 895                                     enum machine_mode, int, int));
 896
 897 /* Like emit_store_flag, but always succeeds.  */
 898 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
 899                                           enum machine_mode, int, int));
 900
 901 /* Functions from loop.c:  */
 902
 903 /* Given an insn and condition, return a canonical description of
 904    the test being made.  */
 905 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
 906
 907 /* Given a JUMP_INSN, return a canonical description of the test
 908    being made.  */
 909 extern rtx get_condition PARAMS ((rtx, rtx *));
 910
 911 /* Generate a conditional trap instruction.  */
 912 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
 913 \f
 914 /* Functions from builtins.c:  */
 915 #ifdef TREE_CODE
 916 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
 917 extern tree expand_tree_builtin PARAMS ((tree, tree, tree));
 918 extern void std_expand_builtin_va_start PARAMS ((int, tree, rtx));
 919 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
 920 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
 921 #endif
 922
 923 extern void expand_builtin_setjmp_setup PARAMS ((rtx, rtx));
 924 extern void expand_builtin_setjmp_receiver PARAMS ((rtx));
 925 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
 926 extern rtx expand_builtin_saveregs PARAMS ((void));
 927 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
 928 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
 929 extern void record_base_value           PARAMS ((unsigned int, rtx, int));
 930 extern void record_alias_subset         PARAMS ((HOST_WIDE_INT,
 931                                                  HOST_WIDE_INT));
 932 extern HOST_WIDE_INT new_alias_set              PARAMS ((void));
 933 \f
 934 /* Functions from expr.c:  */
 935
 936 /* This is run once per compilation to set up which modes can be used
 937    directly in memory and to initialize the block move optab.  */
 938 extern void init_expr_once PARAMS ((void));
 939
 940 /* This is run at the start of compiling a function.  */
 941 extern void init_expr PARAMS ((void));
 942
 943 /* This function is run once to initialize stor-layout.c.  */
 944
 945 extern void init_stor_layout_once PARAMS ((void));
 946
 947 /* This is run at the end of compiling a function.  */
 948 extern void finish_expr_for_function PARAMS ((void));
 949
 950 /* Use protect_from_queue to convert a QUEUED expression
 951    into something that you can put immediately into an instruction.  */
 952 extern rtx protect_from_queue PARAMS ((rtx, int));
 953
 954 /* Perform all the pending incrementations.  */
 955 extern void emit_queue PARAMS ((void));
 956
 957 /* Tell if something has a queued subexpression.  */
 958 extern int queued_subexp_p PARAMS ((rtx));
 959
 960 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 961    Both modes must be floating or both fixed.  */
 962 extern void convert_move PARAMS ((rtx, rtx, int));
 963
 964 /* Convert an rtx to specified machine mode and return the result.  */
 965 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
 966
 967 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 968 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
 969                                   rtx, int));
 970
 971 /* Emit code to move a block Y to a block X.  */
 972 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, unsigned int));
 973
 974 /* Copy all or part of a value X into registers starting at REGNO.
 975    The number of registers to be filled is NREGS.  */
 976 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
 977
 978 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 979    The number of registers to be filled is NREGS.  */
 980 extern void move_block_from_reg PARAMS ((int, rtx, int, int));
 981
 982 /* Load a BLKmode value into non-consecutive registers represented by a
 983    PARALLEL.  */
 984 extern void emit_group_load PARAMS ((rtx, rtx, int, unsigned int));
 985
 986 /* Store a BLKmode value from non-consecutive registers represented by a
 987    PARALLEL.  */
 988 extern void emit_group_store PARAMS ((rtx, rtx, int, unsigned int));
 989
 990 #ifdef TREE_CODE
 991 /* Copy BLKmode object from a set of registers. */
 992 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
 993 #endif
 994
 995 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 996 extern void use_reg PARAMS ((rtx *, rtx));
 997
 998 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 999    for the next CALL_INSN.  */
1000 extern void use_regs PARAMS ((rtx *, int, int));
1001
1002 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
1003 extern void use_group_regs PARAMS ((rtx *, rtx));
1004
1005 /* Write zeros through the storage of OBJECT.
1006    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
1007    alignment.  */
1008 extern rtx clear_storage PARAMS ((rtx, rtx, unsigned int));
1009
1010 /* Return non-zero if it is desirable to store LEN bytes generated by
1011    CONSTFUN with several move instructions by store_by_pieces
1012    function.  CONSTFUNDATA is a pointer which will be passed as argument
1013    in every CONSTFUN call.
1014    ALIGN is maximum alignment we can assume.  */
1015 extern int can_store_by_pieces PARAMS ((unsigned HOST_WIDE_INT,
1016                                         rtx (*) (PTR, HOST_WIDE_INT,
1017                                                  enum machine_mode),
1018                                         PTR, unsigned int));
1019
1020 /* Generate several move instructions to store LEN bytes generated by
1021    CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
1022    pointer which will be passed as argument in every CONSTFUN call.
1023    ALIGN is maximum alignment we can assume.  */
1024 extern void store_by_pieces PARAMS ((rtx, unsigned HOST_WIDE_INT,
1025                                      rtx (*) (PTR, HOST_WIDE_INT,
1026                                               enum machine_mode),
1027                                      PTR, unsigned int));
1028
1029 /* Emit insns to set X from Y.  */
1030 extern rtx emit_move_insn PARAMS ((rtx, rtx));
1031
1032 /* Emit insns to set X from Y, with no frills.  */
1033 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
1034
1035 /* Push a block of length SIZE (perhaps variable)
1036    and return an rtx to address the beginning of the block.  */
1037 extern rtx push_block PARAMS ((rtx, int, int));
1038
1039 #ifdef TREE_CODE
1040 /* Generate code to push something onto the stack, given its mode and type.  */
1041 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
1042                                     unsigned int, int, rtx, int, rtx, rtx,
1043                                     int, rtx));
1044
1045 /* Expand an assignment that stores the value of FROM into TO. */
1046 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
1047
1048 /* Generate code for computing expression EXP,
1049    and storing the value into TARGET.
1050    If SUGGEST_REG is nonzero, copy the value through a register
1051    and return that register, if that is possible.  */
1052 extern rtx store_expr PARAMS ((tree, rtx, int));
1053 #endif
1054
1055 /* Given an rtx that may include add and multiply operations,
1056    generate them as insns and return a pseudo-reg containing the value.
1057    Useful after calling expand_expr with 1 as sum_ok.  */
1058 extern rtx force_operand PARAMS ((rtx, rtx));
1059
1060 #ifdef TREE_CODE
1061 /* Generate code for computing expression EXP.
1062    An rtx for the computed value is returned.  The value is never null.
1063    In the case of a void EXP, const0_rtx is returned.  */
1064 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
1065                                 enum expand_modifier));
1066 #endif
1067
1068 /* At the start of a function, record that we have no previously-pushed
1069    arguments waiting to be popped.  */
1070 extern void init_pending_stack_adjust PARAMS ((void));
1071
1072 /* When exiting from function, if safe, clear out any pending stack adjust
1073    so the adjustment won't get done.  */
1074 extern void clear_pending_stack_adjust PARAMS ((void));
1075
1076 /* Pop any previously-pushed arguments that have not been popped yet.  */
1077 extern void do_pending_stack_adjust PARAMS ((void));
1078
1079 #ifdef TREE_CODE
1080 /* Return the tree node and offset if a given argument corresponds to
1081    a string constant.  */
1082 extern tree string_constant PARAMS ((tree, tree *));
1083
1084 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
1085 extern void jumpifnot PARAMS ((tree, rtx));
1086
1087 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
1088 extern void jumpif PARAMS ((tree, rtx));
1089
1090 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
1091    the result is zero, or IF_TRUE_LABEL if the result is one.  */
1092 extern void do_jump PARAMS ((tree, rtx, rtx));
1093 #endif
1094
1095 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
1096 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
1097                                      enum machine_mode, rtx, unsigned int));
1098 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
1099                                              enum machine_mode, rtx,
1100                                              unsigned int, rtx, rtx));
1101
1102 /* Generate a tablejump instruction (used for switch statements).  */
1103 extern void do_tablejump PARAMS ((rtx, enum machine_mode, rtx, rtx, rtx));
1104 \f
1105 #ifdef TREE_CODE
1106 /* rtl.h and tree.h were included.  */
1107 /* Return an rtx for the size in bytes of the value of an expr.  */
1108 extern rtx expr_size PARAMS ((tree));
1109
1110 extern rtx lookup_static_chain PARAMS ((tree));
1111
1112 /* Convert a stack slot address ADDR valid in function FNDECL
1113    into an address valid in this function (using a static chain).  */
1114 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
1115
1116 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
1117 extern rtx trampoline_address PARAMS ((tree));
1118
1119 /* Return an rtx that refers to the value returned by a function
1120    in its original home.  This becomes invalid if any more code is emitted.  */
1121 extern rtx hard_function_value PARAMS ((tree, tree, int));
1122
1123 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int));
1124
1125 extern rtx expand_call PARAMS ((tree, rtx, int));
1126
1127 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
1128                                  rtx, int));
1129 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
1130                                   rtx, rtx, int));
1131 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
1132                                          struct args_size *,
1133                                          struct args_size *,
1134                                          struct args_size *,
1135                                          struct args_size *));
1136 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
1137
1138 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
1139 extern rtx label_rtx PARAMS ((tree));
1140 #endif
1141
1142 /* Indicate how an input argument register was promoted.  */
1143 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
1144                                        int *));
1145
1146 /* Return an rtx like arg but sans any constant terms.
1147    Returns the original rtx if it has no constant terms.
1148    The constant terms are added and stored via a second arg.  */
1149 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
1150
1151 /* Convert arg to a valid memory address for specified machine mode,
1152    by emitting insns to perform arithmetic if nec.  */
1153 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
1154
1155 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
1156 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
1157
1158 /* Return a memory reference like MEMREF, but with its mode changed
1159    to MODE and its address changed to ADDR.
1160    (VOIDmode means don't change the mode.
1161    NULL for ADDR means don't change the address.)  */
1162 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
1163
1164 /* Return a memory reference like MEMREF, but which is known to have a
1165    valid address.  */
1166 extern rtx validize_mem PARAMS ((rtx));
1167
1168 #ifdef TREE_CODE
1169 /* Given REF, either a MEM or a REG, and T, either the type of X or
1170    the expression corresponding to REF, set RTX_UNCHANGING_P if
1171    appropriate.  */
1172 extern void maybe_set_unchanging PARAMS ((rtx, tree));
1173
1174 /* Given REF, a MEM, and T, either the type of X or the expression
1175    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
1176    if we are making a new object of this type.  */
1177 extern void set_mem_attributes PARAMS ((rtx, tree, int));
1178 #endif
1179
1180 /* Assemble the static constant template for function entry trampolines.  */
1181 extern rtx assemble_trampoline_template PARAMS ((void));
1182
1183 /* Return 1 if two rtx's are equivalent in structure and elements.  */
1184 extern int rtx_equal_p PARAMS ((rtx, rtx));
1185
1186 /* Given rtx, return new rtx whose address won't be affected by
1187    any side effects.  It has been copied to a new temporary reg.  */
1188 extern rtx stabilize PARAMS ((rtx));
1189
1190 /* Given an rtx, copy all regs it refers to into new temps
1191    and return a modified copy that refers to the new temps.  */
1192 extern rtx copy_all_regs PARAMS ((rtx));
1193
1194 /* Copy given rtx to a new temp reg and return that.  */
1195 extern rtx copy_to_reg PARAMS ((rtx));
1196
1197 /* Like copy_to_reg but always make the reg Pmode.  */
1198 extern rtx copy_addr_to_reg PARAMS ((rtx));
1199
1200 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
1201 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
1202
1203 /* Copy given rtx to given temp reg and return that.  */
1204 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
1205
1206 /* Copy a value to a register if it isn't already a register.
1207    Args are mode (in case value is a constant) and the value.  */
1208 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
1209
1210 /* Return given rtx, copied into a new temp reg if it was in memory.  */
1211 extern rtx force_not_mem PARAMS ((rtx));
1212
1213 #ifdef TREE_CODE
1214 /* Return mode and signedness to use when object is promoted.  */
1215 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
1216                                                int *, int));
1217 #endif
1218
1219 /* Remove some bytes from the stack.  An rtx says how many.  */
1220 extern void adjust_stack PARAMS ((rtx));
1221
1222 /* Add some bytes to the stack.  An rtx says how many.  */
1223 extern void anti_adjust_stack PARAMS ((rtx));
1224
1225 /* This enum is used for the following two functions.  */
1226 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
1227
1228 /* Save the stack pointer at the specified level.  */
1229 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
1230
1231 /* Restore the stack pointer from a save area of the specified level.  */
1232 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
1233
1234 /* Allocate some space on the stack dynamically and return its address.  An rtx
1235    says how many bytes.  */
1236 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
1237
1238 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
1239    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
1240    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
1241    subtract from the stack.  If SIZE is constant, this is done
1242    with a fixed number of probes.  Otherwise, we must make a loop.  */
1243 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
1244
1245 /* Return an rtx that refers to the value returned by a library call
1246    in its original home.  This becomes invalid if any more code is emitted.  */
1247 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
1248
1249 /* Given an rtx, return an rtx for a value rounded up to a multiple
1250    of STACK_BOUNDARY / BITS_PER_UNIT.  */
1251 extern rtx round_push PARAMS ((rtx));
1252
1253 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
1254                                     unsigned HOST_WIDE_INT,
1255                                     enum machine_mode, rtx,
1256                                     unsigned int, HOST_WIDE_INT));
1257 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
1258                                       unsigned HOST_WIDE_INT, int, rtx,
1259                                       enum machine_mode, enum machine_mode,
1260                                       unsigned int, HOST_WIDE_INT));
1261 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
1262 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
1263 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
1264
1265 extern rtx assemble_static_space PARAMS ((int));
1266
1267 /* Hook called by expand_expr for language-specific tree codes.
1268    It is up to the language front end to install a hook
1269    if it has any such codes that expand_expr needs to know about.  */
1270 extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx,
1271                                         enum machine_mode,
1272                                         enum expand_modifier modifier));
1273
1274 #ifdef TREE_CODE
1275 /* Hook called by output_constant for language-specific tree codes.
1276    It is up to the language front-end to install a hook if it has any
1277    such codes that output_constant needs to know about.  Returns a
1278    language-independent constant equivalent to its input.  */
1279 extern tree (*lang_expand_constant) PARAMS ((tree));
1280
1281 extern int safe_from_p PARAMS ((rtx, tree, int));
1282
1283 /* Hook called by safe_from_p for language-specific tree codes.  It is
1284    up to the language front-end to install a hook if it has any such
1285    codes that safe_from_p needs to know about.  Since same_from_p will
1286    recursively explore the TREE_OPERANDs of an expression, this hook
1287    should not reexamine those pieces.  This routine may recursively
1288    call safe_from_p; it should always pass `0' as the TOP_P
1289    parameter.  */
1290 extern int (*lang_safe_from_p) PARAMS ((rtx, tree));
1291 #endif
1292
1293 extern void init_all_optabs                     PARAMS ((void));
1294 extern void do_jump_by_parts_equality_rtx       PARAMS ((rtx, rtx, rtx));
1295 extern void do_jump_by_parts_greater_rtx        PARAMS ((enum machine_mode,
1296                                                          int, rtx, rtx, rtx,
1297                                                          rtx));
1298
1299 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
1300 extern void mark_seen_cases                     PARAMS ((tree, unsigned char *,
1301                                                          HOST_WIDE_INT, int));
1302 #endif