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 /* Everything that uses expr.h needs to define enum insn_code
 272    but we don't list it in the Makefile dependencies just for that.  */
 273 #include "insn-codes.h"
 274
 275 typedef struct optab
 276 {
 277   enum rtx_code code;
 278   struct {
 279     enum insn_code insn_code;
 280     rtx libfunc;
 281   } handlers [NUM_MACHINE_MODES];
 282 } * optab;
 283
 284 /* Given an enum insn_code, access the function to construct
 285    the body of that kind of insn.  */
 286 #ifdef FUNCTION_CONVERSION_BUG
 287 /* Some compilers fail to convert a function properly to a
 288    pointer-to-function when used as an argument.
 289    So produce the pointer-to-function directly.
 290    Luckily, these compilers seem to work properly when you
 291    call the pointer-to-function.  */
 292 #define GEN_FCN(CODE) (insn_data[(int) (CODE)].genfun)
 293 #else
 294 #define GEN_FCN(CODE) (*insn_data[(int) (CODE)].genfun)
 295 #endif
 296
 297 /* Enumeration of valid indexes into optab_table.  */
 298 enum optab_index
 299 {
 300   OTI_add,
 301   OTI_sub,
 302
 303   /* Signed and fp multiply */
 304   OTI_smul,
 305   /* Signed multiply, return high word */
 306   OTI_smul_highpart,
 307   OTI_umul_highpart,
 308   /* Signed multiply with result one machine mode wider than args */
 309   OTI_smul_widen,
 310   OTI_umul_widen,
 311
 312   /* Signed divide */
 313   OTI_sdiv,
 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   /* Abs value */
 361   OTI_abs,
 362   /* Bitwise not */
 363   OTI_one_cmpl,
 364   /* Find first bit set */
 365   OTI_ffs,
 366   /* Square root */
 367   OTI_sqrt,
 368   /* Sine */
 369   OTI_sin,
 370   /* Cosine */
 371   OTI_cos,
 372
 373   /* Compare insn; two operands.  */
 374   OTI_cmp,
 375   /* Used only for libcalls for unsigned comparisons.  */
 376   OTI_ucmp,
 377   /* tst insn; compare one operand against 0 */
 378   OTI_tst,
 379
 380   /* String length */
 381   OTI_strlen,
 382
 383   /* Combined compare & jump/store flags/move operations.  */
 384   OTI_cbranch,
 385   OTI_cmov,
 386   OTI_cstore,
 387
 388   OTI_MAX
 389 };
 390
 391 extern optab optab_table[OTI_MAX];
 392
 393 #define add_optab (optab_table[OTI_add])
 394 #define sub_optab (optab_table[OTI_sub])
 395 #define smul_optab (optab_table[OTI_smul])
 396 #define smul_highpart_optab (optab_table[OTI_smul_highpart])
 397 #define umul_highpart_optab (optab_table[OTI_umul_highpart])
 398 #define smul_widen_optab (optab_table[OTI_smul_widen])
 399 #define umul_widen_optab (optab_table[OTI_umul_widen])
 400 #define sdiv_optab (optab_table[OTI_sdiv])
 401 #define sdivmod_optab (optab_table[OTI_sdivmod])
 402 #define udiv_optab (optab_table[OTI_udiv])
 403 #define udivmod_optab (optab_table[OTI_udivmod])
 404 #define smod_optab (optab_table[OTI_smod])
 405 #define umod_optab (optab_table[OTI_umod])
 406 #define flodiv_optab (optab_table[OTI_flodiv])
 407 #define ftrunc_optab (optab_table[OTI_ftrunc])
 408 #define and_optab (optab_table[OTI_and])
 409 #define ior_optab (optab_table[OTI_ior])
 410 #define xor_optab (optab_table[OTI_xor])
 411 #define ashl_optab (optab_table[OTI_ashl])
 412 #define lshr_optab (optab_table[OTI_lshr])
 413 #define ashr_optab (optab_table[OTI_ashr])
 414 #define rotl_optab (optab_table[OTI_rotl])
 415 #define rotr_optab (optab_table[OTI_rotr])
 416 #define smin_optab (optab_table[OTI_smin])
 417 #define smax_optab (optab_table[OTI_smax])
 418 #define umin_optab (optab_table[OTI_umin])
 419 #define umax_optab (optab_table[OTI_umax])
 420
 421 #define mov_optab (optab_table[OTI_mov])
 422 #define movstrict_optab (optab_table[OTI_movstrict])
 423
 424 #define neg_optab (optab_table[OTI_neg])
 425 #define abs_optab (optab_table[OTI_abs])
 426 #define one_cmpl_optab (optab_table[OTI_one_cmpl])
 427 #define ffs_optab (optab_table[OTI_ffs])
 428 #define sqrt_optab (optab_table[OTI_sqrt])
 429 #define sin_optab (optab_table[OTI_sin])
 430 #define cos_optab (optab_table[OTI_cos])
 431
 432 #define cmp_optab (optab_table[OTI_cmp])
 433 #define ucmp_optab (optab_table[OTI_ucmp])
 434 #define tst_optab (optab_table[OTI_tst])
 435
 436 #define strlen_optab (optab_table[OTI_strlen])
 437
 438 #define cbranch_optab (optab_table[OTI_cbranch])
 439 #define cmov_optab (optab_table[OTI_cmov])
 440 #define cstore_optab (optab_table[OTI_cstore])
 441
 442 /* Tables of patterns for extending one integer mode to another.  */
 443 extern enum insn_code extendtab[MAX_MACHINE_MODE][MAX_MACHINE_MODE][2];
 444
 445 /* Tables of patterns for converting between fixed and floating point. */
 446 extern enum insn_code fixtab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 447 extern enum insn_code fixtrunctab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 448 extern enum insn_code floattab[NUM_MACHINE_MODES][NUM_MACHINE_MODES][2];
 449
 450 /* Contains the optab used for each rtx code.  */
 451 extern optab code_to_optab[NUM_RTX_CODE + 1];
 452
 453 /* Passed to expand_binop and expand_unop to say which options to try to use
 454    if the requested operation can't be open-coded on the requisite mode.
 455    Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using a library call.
 456    Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try using a wider mode.
 457    OPTAB_MUST_WIDEN says try widening and don't try anything else.  */
 458
 459 enum optab_methods
 460 {
 461   OPTAB_DIRECT,
 462   OPTAB_LIB,
 463   OPTAB_WIDEN,
 464   OPTAB_LIB_WIDEN,
 465   OPTAB_MUST_WIDEN
 466 };
 467
 468 /* Enumeration of indexes into libfunc_table.  */
 469 enum libfunc_index
 470 {
 471   LTI_extendsfdf2,
 472   LTI_extendsfxf2,
 473   LTI_extendsftf2,
 474   LTI_extenddfxf2,
 475   LTI_extenddftf2,
 476
 477   LTI_truncdfsf2,
 478   LTI_truncxfsf2,
 479   LTI_trunctfsf2,
 480   LTI_truncxfdf2,
 481   LTI_trunctfdf2,
 482
 483   LTI_memcpy,
 484   LTI_bcopy,
 485   LTI_memcmp,
 486   LTI_bcmp,
 487   LTI_memset,
 488   LTI_bzero,
 489
 490   LTI_throw,
 491   LTI_rethrow,
 492   LTI_sjthrow,
 493   LTI_sjpopnthrow,
 494   LTI_terminate,
 495   LTI_setjmp,
 496   LTI_longjmp,
 497   LTI_eh_rtime_match,
 498
 499   LTI_eqhf2,
 500   LTI_nehf2,
 501   LTI_gthf2,
 502   LTI_gehf2,
 503   LTI_lthf2,
 504   LTI_lehf2,
 505   LTI_unordhf2,
 506
 507   LTI_eqsf2,
 508   LTI_nesf2,
 509   LTI_gtsf2,
 510   LTI_gesf2,
 511   LTI_ltsf2,
 512   LTI_lesf2,
 513   LTI_unordsf2,
 514
 515   LTI_eqdf2,
 516   LTI_nedf2,
 517   LTI_gtdf2,
 518   LTI_gedf2,
 519   LTI_ltdf2,
 520   LTI_ledf2,
 521   LTI_unorddf2,
 522
 523   LTI_eqxf2,
 524   LTI_nexf2,
 525   LTI_gtxf2,
 526   LTI_gexf2,
 527   LTI_ltxf2,
 528   LTI_lexf2,
 529   LTI_unordxf2,
 530
 531   LTI_eqtf2,
 532   LTI_netf2,
 533   LTI_gttf2,
 534   LTI_getf2,
 535   LTI_lttf2,
 536   LTI_letf2,
 537   LTI_unordtf2,
 538
 539   LTI_floatsisf,
 540   LTI_floatdisf,
 541   LTI_floattisf,
 542
 543   LTI_floatsidf,
 544   LTI_floatdidf,
 545   LTI_floattidf,
 546
 547   LTI_floatsixf,
 548   LTI_floatdixf,
 549   LTI_floattixf,
 550
 551   LTI_floatsitf,
 552   LTI_floatditf,
 553   LTI_floattitf,
 554
 555   LTI_fixsfsi,
 556   LTI_fixsfdi,
 557   LTI_fixsfti,
 558
 559   LTI_fixdfsi,
 560   LTI_fixdfdi,
 561   LTI_fixdfti,
 562
 563   LTI_fixxfsi,
 564   LTI_fixxfdi,
 565   LTI_fixxfti,
 566
 567   LTI_fixtfsi,
 568   LTI_fixtfdi,
 569   LTI_fixtfti,
 570
 571   LTI_fixunssfsi,
 572   LTI_fixunssfdi,
 573   LTI_fixunssfti,
 574
 575   LTI_fixunsdfsi,
 576   LTI_fixunsdfdi,
 577   LTI_fixunsdfti,
 578
 579   LTI_fixunsxfsi,
 580   LTI_fixunsxfdi,
 581   LTI_fixunsxfti,
 582
 583   LTI_fixunstfsi,
 584   LTI_fixunstfdi,
 585   LTI_fixunstfti,
 586
 587   LTI_chkr_check_addr,
 588   LTI_chkr_set_right,
 589   LTI_chkr_copy_bitmap,
 590   LTI_chkr_check_exec,
 591   LTI_chkr_check_str,
 592
 593   LTI_profile_function_entry,
 594   LTI_profile_function_exit,
 595
 596   LTI_MAX
 597 };
 598
 599 /* SYMBOL_REF rtx's for the library functions that are called
 600    implicitly and not via optabs.  */
 601 extern rtx libfunc_table[LTI_MAX];
 602
 603 /* Accessor macros for libfunc_table.  */
 604 #define extendsfdf2_libfunc     (libfunc_table[LTI_extendsfdf2])
 605 #define extendsfxf2_libfunc     (libfunc_table[LTI_extendsfxf2])
 606 #define extendsftf2_libfunc     (libfunc_table[LTI_extendsftf2])
 607 #define extenddfxf2_libfunc     (libfunc_table[LTI_extenddfxf2])
 608 #define extenddftf2_libfunc     (libfunc_table[LTI_extenddftf2])
 609
 610 #define truncdfsf2_libfunc      (libfunc_table[LTI_truncdfsf2])
 611 #define truncxfsf2_libfunc      (libfunc_table[LTI_truncxfsf2])
 612 #define trunctfsf2_libfunc      (libfunc_table[LTI_trunctfsf2])
 613 #define truncxfdf2_libfunc      (libfunc_table[LTI_truncxfdf2])
 614 #define trunctfdf2_libfunc      (libfunc_table[LTI_trunctfdf2])
 615
 616 #define memcpy_libfunc  (libfunc_table[LTI_memcpy])
 617 #define bcopy_libfunc   (libfunc_table[LTI_bcopy])
 618 #define memcmp_libfunc  (libfunc_table[LTI_memcmp])
 619 #define bcmp_libfunc    (libfunc_table[LTI_bcmp])
 620 #define memset_libfunc  (libfunc_table[LTI_memset])
 621 #define bzero_libfunc   (libfunc_table[LTI_bzero])
 622
 623 #define throw_libfunc   (libfunc_table[LTI_throw])
 624 #define rethrow_libfunc (libfunc_table[LTI_rethrow])
 625 #define sjthrow_libfunc (libfunc_table[LTI_sjthrow])
 626 #define sjpopnthrow_libfunc     (libfunc_table[LTI_sjpopnthrow])
 627 #define terminate_libfunc       (libfunc_table[LTI_terminate])
 628 #define setjmp_libfunc  (libfunc_table[LTI_setjmp])
 629 #define longjmp_libfunc (libfunc_table[LTI_longjmp])
 630 #define eh_rtime_match_libfunc  (libfunc_table[LTI_eh_rtime_match])
 631
 632 #define eqhf2_libfunc   (libfunc_table[LTI_eqhf2])
 633 #define nehf2_libfunc   (libfunc_table[LTI_nehf2])
 634 #define gthf2_libfunc   (libfunc_table[LTI_gthf2])
 635 #define gehf2_libfunc   (libfunc_table[LTI_gehf2])
 636 #define lthf2_libfunc   (libfunc_table[LTI_lthf2])
 637 #define lehf2_libfunc   (libfunc_table[LTI_lehf2])
 638 #define unordhf2_libfunc        (libfunc_table[LTI_unordhf2])
 639
 640 #define eqsf2_libfunc   (libfunc_table[LTI_eqsf2])
 641 #define nesf2_libfunc   (libfunc_table[LTI_nesf2])
 642 #define gtsf2_libfunc   (libfunc_table[LTI_gtsf2])
 643 #define gesf2_libfunc   (libfunc_table[LTI_gesf2])
 644 #define ltsf2_libfunc   (libfunc_table[LTI_ltsf2])
 645 #define lesf2_libfunc   (libfunc_table[LTI_lesf2])
 646 #define unordsf2_libfunc        (libfunc_table[LTI_unordsf2])
 647
 648 #define eqdf2_libfunc   (libfunc_table[LTI_eqdf2])
 649 #define nedf2_libfunc   (libfunc_table[LTI_nedf2])
 650 #define gtdf2_libfunc   (libfunc_table[LTI_gtdf2])
 651 #define gedf2_libfunc   (libfunc_table[LTI_gedf2])
 652 #define ltdf2_libfunc   (libfunc_table[LTI_ltdf2])
 653 #define ledf2_libfunc   (libfunc_table[LTI_ledf2])
 654 #define unorddf2_libfunc        (libfunc_table[LTI_unorddf2])
 655
 656 #define eqxf2_libfunc   (libfunc_table[LTI_eqxf2])
 657 #define nexf2_libfunc   (libfunc_table[LTI_nexf2])
 658 #define gtxf2_libfunc   (libfunc_table[LTI_gtxf2])
 659 #define gexf2_libfunc   (libfunc_table[LTI_gexf2])
 660 #define ltxf2_libfunc   (libfunc_table[LTI_ltxf2])
 661 #define lexf2_libfunc   (libfunc_table[LTI_lexf2])
 662 #define unordxf2_libfunc        (libfunc_table[LTI_unordxf2])
 663
 664 #define eqtf2_libfunc   (libfunc_table[LTI_eqtf2])
 665 #define netf2_libfunc   (libfunc_table[LTI_netf2])
 666 #define gttf2_libfunc   (libfunc_table[LTI_gttf2])
 667 #define getf2_libfunc   (libfunc_table[LTI_getf2])
 668 #define lttf2_libfunc   (libfunc_table[LTI_lttf2])
 669 #define letf2_libfunc   (libfunc_table[LTI_letf2])
 670 #define unordtf2_libfunc        (libfunc_table[LTI_unordtf2])
 671
 672 #define floatsisf_libfunc       (libfunc_table[LTI_floatsisf])
 673 #define floatdisf_libfunc       (libfunc_table[LTI_floatdisf])
 674 #define floattisf_libfunc       (libfunc_table[LTI_floattisf])
 675
 676 #define floatsidf_libfunc       (libfunc_table[LTI_floatsidf])
 677 #define floatdidf_libfunc       (libfunc_table[LTI_floatdidf])
 678 #define floattidf_libfunc       (libfunc_table[LTI_floattidf])
 679
 680 #define floatsixf_libfunc       (libfunc_table[LTI_floatsixf])
 681 #define floatdixf_libfunc       (libfunc_table[LTI_floatdixf])
 682 #define floattixf_libfunc       (libfunc_table[LTI_floattixf])
 683
 684 #define floatsitf_libfunc       (libfunc_table[LTI_floatsitf])
 685 #define floatditf_libfunc       (libfunc_table[LTI_floatditf])
 686 #define floattitf_libfunc       (libfunc_table[LTI_floattitf])
 687
 688 #define fixsfsi_libfunc (libfunc_table[LTI_fixsfsi])
 689 #define fixsfdi_libfunc (libfunc_table[LTI_fixsfdi])
 690 #define fixsfti_libfunc (libfunc_table[LTI_fixsfti])
 691
 692 #define fixdfsi_libfunc (libfunc_table[LTI_fixdfsi])
 693 #define fixdfdi_libfunc (libfunc_table[LTI_fixdfdi])
 694 #define fixdfti_libfunc (libfunc_table[LTI_fixdfti])
 695
 696 #define fixxfsi_libfunc (libfunc_table[LTI_fixxfsi])
 697 #define fixxfdi_libfunc (libfunc_table[LTI_fixxfdi])
 698 #define fixxfti_libfunc (libfunc_table[LTI_fixxfti])
 699
 700 #define fixtfsi_libfunc (libfunc_table[LTI_fixtfsi])
 701 #define fixtfdi_libfunc (libfunc_table[LTI_fixtfdi])
 702 #define fixtfti_libfunc (libfunc_table[LTI_fixtfti])
 703
 704 #define fixunssfsi_libfunc      (libfunc_table[LTI_fixunssfsi])
 705 #define fixunssfdi_libfunc      (libfunc_table[LTI_fixunssfdi])
 706 #define fixunssfti_libfunc      (libfunc_table[LTI_fixunssfti])
 707
 708 #define fixunsdfsi_libfunc      (libfunc_table[LTI_fixunsdfsi])
 709 #define fixunsdfdi_libfunc      (libfunc_table[LTI_fixunsdfdi])
 710 #define fixunsdfti_libfunc      (libfunc_table[LTI_fixunsdfti])
 711
 712 #define fixunsxfsi_libfunc      (libfunc_table[LTI_fixunsxfsi])
 713 #define fixunsxfdi_libfunc      (libfunc_table[LTI_fixunsxfdi])
 714 #define fixunsxfti_libfunc      (libfunc_table[LTI_fixunsxfti])
 715
 716 #define fixunstfsi_libfunc      (libfunc_table[LTI_fixunstfsi])
 717 #define fixunstfdi_libfunc      (libfunc_table[LTI_fixunstfdi])
 718 #define fixunstfti_libfunc      (libfunc_table[LTI_fixunstfti])
 719
 720 #define chkr_check_addr_libfunc (libfunc_table[LTI_chkr_check_addr])
 721 #define chkr_set_right_libfunc  (libfunc_table[LTI_chkr_set_right])
 722 #define chkr_copy_bitmap_libfunc        (libfunc_table[LTI_chkr_copy_bitmap])
 723 #define chkr_check_exec_libfunc (libfunc_table[LTI_chkr_check_exec])
 724 #define chkr_check_str_libfunc  (libfunc_table[LTI_chkr_check_str])
 725
 726 #define profile_function_entry_libfunc  (libfunc_table[LTI_profile_function_entry])
 727 #define profile_function_exit_libfunc   (libfunc_table[LTI_profile_function_exit])
 728 \f
 729 typedef rtx (*rtxfun) PARAMS ((rtx));
 730
 731 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 732    gives the gen_function to make a branch to test that condition.  */
 733
 734 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 735
 736 /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...)
 737    gives the insn code to make a store-condition insn
 738    to test that condition.  */
 739
 740 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 741
 742 #ifdef HAVE_conditional_move
 743 /* Indexed by the machine mode, gives the insn code to make a conditional
 744    move insn.  */
 745
 746 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 747 #endif
 748
 749 /* This array records the insn_code of insns to perform block moves.  */
 750 extern enum insn_code movstr_optab[NUM_MACHINE_MODES];
 751
 752 /* This array records the insn_code of insns to perform block clears.  */
 753 extern enum insn_code clrstr_optab[NUM_MACHINE_MODES];
 754
 755 /* Define functions given in optabs.c.  */
 756
 757 /* Expand a binary operation given optab and rtx operands.  */
 758 extern rtx expand_binop PARAMS ((enum machine_mode, optab, rtx, rtx, rtx,
 759                                  int, enum optab_methods));
 760
 761 /* Expand a binary operation with both signed and unsigned forms.  */
 762 extern rtx sign_expand_binop PARAMS ((enum machine_mode, optab, optab, rtx,
 763                                       rtx, rtx, int, enum optab_methods));
 764
 765 /* Generate code to perform an operation on two operands with two results.  */
 766 extern int expand_twoval_binop PARAMS ((optab, rtx, rtx, rtx, rtx, int));
 767
 768 /* Expand a unary arithmetic operation given optab rtx operand.  */
 769 extern rtx expand_unop PARAMS ((enum machine_mode, optab, rtx, rtx, int));
 770
 771 /* Expand the absolute value operation.  */
 772 extern rtx expand_abs PARAMS ((enum machine_mode, rtx, rtx, int));
 773
 774 /* Expand the complex absolute value operation.  */
 775 extern rtx expand_complex_abs PARAMS ((enum machine_mode, rtx, rtx, int));
 776
 777 /* Generate an instruction with a given INSN_CODE with an output and
 778    an input.  */
 779 extern void emit_unop_insn PARAMS ((int, rtx, rtx, enum rtx_code));
 780
 781 /* Emit code to perform a series of operations on a multi-word quantity, one
 782    word at a time.  */
 783 extern rtx emit_no_conflict_block PARAMS ((rtx, rtx, rtx, rtx, rtx));
 784
 785 /* Emit code to make a call to a constant function or a library call. */
 786 extern void emit_libcall_block PARAMS ((rtx, rtx, rtx, rtx));
 787
 788 /* Emit one rtl instruction to store zero in specified rtx.  */
 789 extern void emit_clr_insn PARAMS ((rtx));
 790
 791 /* Emit one rtl insn to store 1 in specified rtx assuming it contains 0.  */
 792 extern void emit_0_to_1_insn PARAMS ((rtx));
 793
 794 /* Emit one rtl insn to compare two rtx's.  */
 795 extern void emit_cmp_insn PARAMS ((rtx, rtx, enum rtx_code, rtx,
 796                                    enum machine_mode, int, unsigned int));
 797
 798 /* Emit a pair of rtl insns to compare two rtx's and to jump
 799    to a label if the comparison is true.  */
 800 extern void emit_cmp_and_jump_insns PARAMS ((rtx, rtx, enum rtx_code, rtx,
 801                                              enum machine_mode, int,
 802                                              unsigned int, rtx));
 803
 804 /* The various uses that a comparison can have; used by can_compare_p:
 805    jumps, conditional moves, store flag operations.  */
 806 enum can_compare_purpose
 807 {
 808   ccp_jump,
 809   ccp_cmov,
 810   ccp_store_flag
 811 };
 812
 813 /* Nonzero if a compare of mode MODE can be done straightforwardly
 814    (without splitting it into pieces).  */
 815 extern int can_compare_p PARAMS ((enum rtx_code, enum machine_mode,
 816                                   enum can_compare_purpose));
 817
 818 extern void prepare_cmp_insn PARAMS ((rtx *, rtx *, enum rtx_code *, rtx,
 819                                       enum machine_mode *, int *, int,
 820                                       enum can_compare_purpose));
 821
 822 extern rtx prepare_operand PARAMS ((int, rtx, int, enum machine_mode,
 823                                     enum machine_mode, int));
 824
 825 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 826 extern void emit_indirect_jump PARAMS ((rtx));
 827
 828 #ifdef HAVE_conditional_move
 829 /* Emit a conditional move operation.  */
 830 rtx emit_conditional_move PARAMS ((rtx, enum rtx_code, rtx, rtx,
 831                                    enum machine_mode, rtx, rtx,
 832                                    enum machine_mode, int));
 833
 834 /* Return non-zero if the conditional move is supported.  */
 835 int can_conditionally_move_p PARAMS ((enum machine_mode mode));
 836
 837 #endif
 838
 839 /* Create but don't emit one rtl instruction to add one rtx into another.
 840    Modes must match; operands must meet the operation's predicates.
 841    Likewise for subtraction and for just copying.
 842    These do not call protect_from_queue; caller must do so.  */
 843 extern rtx gen_add2_insn PARAMS ((rtx, rtx));
 844 extern rtx gen_sub2_insn PARAMS ((rtx, rtx));
 845 extern rtx gen_move_insn PARAMS ((rtx, rtx));
 846 extern int have_add2_insn PARAMS ((enum machine_mode));
 847 extern int have_sub2_insn PARAMS ((enum machine_mode));
 848
 849 /* Return the INSN_CODE to use for an extend operation.  */
 850 extern enum insn_code can_extend_p PARAMS ((enum machine_mode,
 851                                             enum machine_mode, int));
 852
 853 /* Generate the body of an insn to extend Y (with mode MFROM)
 854    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 855 extern rtx gen_extend_insn PARAMS ((rtx, rtx, enum machine_mode,
 856                                     enum machine_mode, int));
 857
 858 /* Initialize the tables that control conversion between fixed and
 859    floating values.  */
 860 extern void init_fixtab PARAMS ((void));
 861 extern void init_floattab PARAMS ((void));
 862
 863 /* Generate code for a FLOAT_EXPR.  */
 864 extern void expand_float PARAMS ((rtx, rtx, int));
 865
 866 /* Generate code for a FIX_EXPR.  */
 867 extern void expand_fix PARAMS ((rtx, rtx, int));
 868
 869 /* Call this to initialize an optab function entry.  */
 870 extern rtx init_one_libfunc PARAMS ((const char *));
 871
 872 /* Call this once to initialize the contents of the optabs
 873    appropriately for the current target machine.  */
 874 extern void init_optabs PARAMS ((void));
 875 \f
 876 /* Functions from expmed.c:  */
 877
 878 /* Arguments MODE, RTX: return an rtx for the negation of that value.
 879    May emit insns.  */
 880 extern rtx negate_rtx PARAMS ((enum machine_mode, rtx));
 881
 882 /* Expand a logical AND operation.  */
 883 extern rtx expand_and PARAMS ((rtx, rtx, rtx));
 884
 885 /* Emit a store-flag operation.  */
 886 extern rtx emit_store_flag PARAMS ((rtx, enum rtx_code, rtx, rtx,
 887                                     enum machine_mode, int, int));
 888
 889 /* Like emit_store_flag, but always succeeds.  */
 890 extern rtx emit_store_flag_force PARAMS ((rtx, enum rtx_code, rtx, rtx,
 891                                           enum machine_mode, int, int));
 892
 893 /* Functions from loop.c:  */
 894
 895 /* Given an insn and condition, return a canonical description of
 896    the test being made.  */
 897 extern rtx canonicalize_condition PARAMS ((rtx, rtx, int, rtx *, rtx));
 898
 899 /* Given a JUMP_INSN, return a canonical description of the test
 900    being made.  */
 901 extern rtx get_condition PARAMS ((rtx, rtx *));
 902
 903 /* Generate a conditional trap instruction.  */
 904 extern rtx gen_cond_trap PARAMS ((enum rtx_code, rtx, rtx, rtx));
 905 \f
 906 /* Functions from builtins.c:  */
 907 #ifdef TREE_CODE
 908 extern rtx expand_builtin PARAMS ((tree, rtx, rtx, enum machine_mode, int));
 909 extern tree expand_tree_builtin PARAMS ((tree, tree, tree));
 910 extern void std_expand_builtin_va_start PARAMS ((int, tree, rtx));
 911 extern rtx std_expand_builtin_va_arg PARAMS ((tree, tree));
 912 extern rtx expand_builtin_va_arg PARAMS ((tree, tree));
 913 #endif
 914
 915 extern rtx expand_builtin_setjmp PARAMS ((rtx, rtx, rtx, rtx));
 916 extern void expand_builtin_longjmp PARAMS ((rtx, rtx));
 917 extern rtx expand_builtin_saveregs PARAMS ((void));
 918 extern HOST_WIDE_INT get_varargs_alias_set PARAMS ((void));
 919 extern HOST_WIDE_INT get_frame_alias_set PARAMS ((void));
 920 extern void record_base_value           PARAMS ((unsigned int, rtx, int));
 921 extern void record_alias_subset         PARAMS ((HOST_WIDE_INT,
 922                                                  HOST_WIDE_INT));
 923 extern HOST_WIDE_INT new_alias_set              PARAMS ((void));
 924 \f
 925 /* Functions from expr.c:  */
 926
 927 /* This is run once per compilation to set up which modes can be used
 928    directly in memory and to initialize the block move optab.  */
 929 extern void init_expr_once PARAMS ((void));
 930
 931 /* This is run at the start of compiling a function.  */
 932 extern void init_expr PARAMS ((void));
 933
 934 /* This function is run once to initialize stor-layout.c.  */
 935
 936 extern void init_stor_layout_once PARAMS ((void));
 937
 938 /* This is run at the end of compiling a function.  */
 939 extern void finish_expr_for_function PARAMS ((void));
 940
 941 /* Use protect_from_queue to convert a QUEUED expression
 942    into something that you can put immediately into an instruction.  */
 943 extern rtx protect_from_queue PARAMS ((rtx, int));
 944
 945 /* Perform all the pending incrementations.  */
 946 extern void emit_queue PARAMS ((void));
 947
 948 /* Tell if something has a queued subexpression.  */
 949 extern int queued_subexp_p PARAMS ((rtx));
 950
 951 /* Emit some rtl insns to move data between rtx's, converting machine modes.
 952    Both modes must be floating or both fixed.  */
 953 extern void convert_move PARAMS ((rtx, rtx, int));
 954
 955 /* Convert an rtx to specified machine mode and return the result.  */
 956 extern rtx convert_to_mode PARAMS ((enum machine_mode, rtx, int));
 957
 958 /* Convert an rtx to MODE from OLDMODE and return the result.  */
 959 extern rtx convert_modes PARAMS ((enum machine_mode, enum machine_mode,
 960                                   rtx, int));
 961
 962 /* Emit code to move a block Y to a block X.  */
 963 extern rtx emit_block_move PARAMS ((rtx, rtx, rtx, unsigned int));
 964
 965 /* Copy all or part of a value X into registers starting at REGNO.
 966    The number of registers to be filled is NREGS.  */
 967 extern void move_block_to_reg PARAMS ((int, rtx, int, enum machine_mode));
 968
 969 /* Copy all or part of a BLKmode value X out of registers starting at REGNO.
 970    The number of registers to be filled is NREGS.  */
 971 extern void move_block_from_reg PARAMS ((int, rtx, int, int));
 972
 973 /* Load a BLKmode value into non-consecutive registers represented by a
 974    PARALLEL.  */
 975 extern void emit_group_load PARAMS ((rtx, rtx, int, unsigned int));
 976
 977 /* Store a BLKmode value from non-consecutive registers represented by a
 978    PARALLEL.  */
 979 extern void emit_group_store PARAMS ((rtx, rtx, int, unsigned int));
 980
 981 #ifdef TREE_CODE
 982 /* Copy BLKmode object from a set of registers. */
 983 extern rtx copy_blkmode_from_reg PARAMS ((rtx,rtx,tree));
 984 #endif
 985
 986 /* Mark REG as holding a parameter for the next CALL_INSN.  */
 987 extern void use_reg PARAMS ((rtx *, rtx));
 988
 989 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
 990    for the next CALL_INSN.  */
 991 extern void use_regs PARAMS ((rtx *, int, int));
 992
 993 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
 994 extern void use_group_regs PARAMS ((rtx *, rtx));
 995
 996 /* Write zeros through the storage of OBJECT.
 997    If OBJECT has BLKmode, SIZE is its length in bytes and ALIGN is its
 998    alignment.  */
 999 extern rtx clear_storage PARAMS ((rtx, rtx, unsigned int));
1000
1001 /* Emit insns to set X from Y.  */
1002 extern rtx emit_move_insn PARAMS ((rtx, rtx));
1003
1004 /* Emit insns to set X from Y, with no frills.  */
1005 extern rtx emit_move_insn_1 PARAMS ((rtx, rtx));
1006
1007 /* Push a block of length SIZE (perhaps variable)
1008    and return an rtx to address the beginning of the block.  */
1009 extern rtx push_block PARAMS ((rtx, int, int));
1010
1011 /* Make an operand to push something on the stack.  */
1012 extern rtx gen_push_operand PARAMS ((void));
1013
1014 #ifdef TREE_CODE
1015 /* Generate code to push something onto the stack, given its mode and type.  */
1016 extern void emit_push_insn PARAMS ((rtx, enum machine_mode, tree, rtx,
1017                                     unsigned int, int, rtx, int, rtx, rtx,
1018                                     int, rtx));
1019
1020 /* Expand an assignment that stores the value of FROM into TO. */
1021 extern rtx expand_assignment PARAMS ((tree, tree, int, int));
1022
1023 /* Generate code for computing expression EXP,
1024    and storing the value into TARGET.
1025    If SUGGEST_REG is nonzero, copy the value through a register
1026    and return that register, if that is possible.  */
1027 extern rtx store_expr PARAMS ((tree, rtx, int));
1028 #endif
1029
1030 /* Given an rtx that may include add and multiply operations,
1031    generate them as insns and return a pseudo-reg containing the value.
1032    Useful after calling expand_expr with 1 as sum_ok.  */
1033 extern rtx force_operand PARAMS ((rtx, rtx));
1034
1035 #ifdef TREE_CODE
1036 /* Generate code for computing expression EXP.
1037    An rtx for the computed value is returned.  The value is never null.
1038    In the case of a void EXP, const0_rtx is returned.  */
1039 extern rtx expand_expr PARAMS ((tree, rtx, enum machine_mode,
1040                                 enum expand_modifier));
1041 #endif
1042
1043 /* At the start of a function, record that we have no previously-pushed
1044    arguments waiting to be popped.  */
1045 extern void init_pending_stack_adjust PARAMS ((void));
1046
1047 /* When exiting from function, if safe, clear out any pending stack adjust
1048    so the adjustment won't get done.  */
1049 extern void clear_pending_stack_adjust PARAMS ((void));
1050
1051 /* Pop any previously-pushed arguments that have not been popped yet.  */
1052 extern void do_pending_stack_adjust PARAMS ((void));
1053
1054 #ifdef TREE_CODE
1055 /* Return the tree node and offset if a given argument corresponds to
1056    a string constant.  */
1057 extern tree string_constant PARAMS ((tree, tree *));
1058
1059 /* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
1060 extern void jumpifnot PARAMS ((tree, rtx));
1061
1062 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
1063 extern void jumpif PARAMS ((tree, rtx));
1064
1065 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
1066    the result is zero, or IF_TRUE_LABEL if the result is one.  */
1067 extern void do_jump PARAMS ((tree, rtx, rtx));
1068 #endif
1069
1070 /* Generate rtl to compare two rtx's, will call emit_cmp_insn.  */
1071 extern rtx compare_from_rtx PARAMS ((rtx, rtx, enum rtx_code, int,
1072                                      enum machine_mode, rtx, unsigned int));
1073 extern void do_compare_rtx_and_jump PARAMS ((rtx, rtx, enum rtx_code, int,
1074                                              enum machine_mode, rtx,
1075                                              unsigned int, rtx, rtx));
1076
1077 /* Generate a tablejump instruction (used for switch statements).  */
1078 extern void do_tablejump PARAMS ((rtx, enum machine_mode, rtx, rtx, rtx));
1079 \f
1080 #ifdef TREE_CODE
1081 /* rtl.h and tree.h were included.  */
1082 /* Return an rtx for the size in bytes of the value of an expr.  */
1083 extern rtx expr_size PARAMS ((tree));
1084
1085 extern rtx lookup_static_chain PARAMS ((tree));
1086
1087 /* Convert a stack slot address ADDR valid in function FNDECL
1088    into an address valid in this function (using a static chain).  */
1089 extern rtx fix_lexical_addr PARAMS ((rtx, tree));
1090
1091 /* Return the address of the trampoline for entering nested fn FUNCTION.  */
1092 extern rtx trampoline_address PARAMS ((tree));
1093
1094 /* Return an rtx that refers to the value returned by a function
1095    in its original home.  This becomes invalid if any more code is emitted.  */
1096 extern rtx hard_function_value PARAMS ((tree, tree, int));
1097
1098 extern rtx prepare_call_address PARAMS ((rtx, tree, rtx *, int));
1099
1100 extern rtx expand_call PARAMS ((tree, rtx, int));
1101
1102 extern rtx expand_shift PARAMS ((enum tree_code, enum machine_mode, rtx, tree,
1103                                  rtx, int));
1104 extern rtx expand_divmod PARAMS ((int, enum tree_code, enum machine_mode, rtx,
1105                                   rtx, rtx, int));
1106 extern void locate_and_pad_parm PARAMS ((enum machine_mode, tree, int, tree,
1107                                          struct args_size *,
1108                                          struct args_size *,
1109                                          struct args_size *,
1110                                          struct args_size *));
1111 extern rtx expand_inline_function PARAMS ((tree, tree, rtx, int, tree, rtx));
1112
1113 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
1114 extern rtx label_rtx PARAMS ((tree));
1115 #endif
1116
1117 /* Indicate how an input argument register was promoted.  */
1118 extern rtx promoted_input_arg PARAMS ((unsigned int, enum machine_mode *,
1119                                        int *));
1120
1121 /* Return an rtx like arg but sans any constant terms.
1122    Returns the original rtx if it has no constant terms.
1123    The constant terms are added and stored via a second arg.  */
1124 extern rtx eliminate_constant_term PARAMS ((rtx, rtx *));
1125
1126 /* Convert arg to a valid memory address for specified machine mode,
1127    by emitting insns to perform arithmetic if nec.  */
1128 extern rtx memory_address PARAMS ((enum machine_mode, rtx));
1129
1130 /* Like `memory_address' but pretent `flag_force_addr' is 0.  */
1131 extern rtx memory_address_noforce PARAMS ((enum machine_mode, rtx));
1132
1133 /* Return a memory reference like MEMREF, but with its mode changed
1134    to MODE and its address changed to ADDR.
1135    (VOIDmode means don't change the mode.
1136    NULL for ADDR means don't change the address.)  */
1137 extern rtx change_address PARAMS ((rtx, enum machine_mode, rtx));
1138
1139 /* Return a memory reference like MEMREF, but which is known to have a
1140    valid address.  */
1141 extern rtx validize_mem PARAMS ((rtx));
1142
1143 #ifdef TREE_CODE
1144 /* Given REF, either a MEM or a REG, and T, either the type of X or
1145    the expression corresponding to REF, set RTX_UNCHANGING_P if
1146    appropriate.  */
1147 extern void maybe_set_unchanging PARAMS ((rtx, tree));
1148
1149 /* Given REF, a MEM, and T, either the type of X or the expression
1150    corresponding to REF, set the memory attributes.  OBJECTP is nonzero
1151    if we are making a new object of this type.  */
1152 extern void set_mem_attributes PARAMS ((rtx, tree, int));
1153 #endif
1154
1155 /* Assemble the static constant template for function entry trampolines.  */
1156 extern rtx assemble_trampoline_template PARAMS ((void));
1157
1158 /* Return 1 if two rtx's are equivalent in structure and elements.  */
1159 extern int rtx_equal_p PARAMS ((rtx, rtx));
1160
1161 /* Given rtx, return new rtx whose address won't be affected by
1162    any side effects.  It has been copied to a new temporary reg.  */
1163 extern rtx stabilize PARAMS ((rtx));
1164
1165 /* Given an rtx, copy all regs it refers to into new temps
1166    and return a modified copy that refers to the new temps.  */
1167 extern rtx copy_all_regs PARAMS ((rtx));
1168
1169 /* Copy given rtx to a new temp reg and return that.  */
1170 extern rtx copy_to_reg PARAMS ((rtx));
1171
1172 /* Like copy_to_reg but always make the reg Pmode.  */
1173 extern rtx copy_addr_to_reg PARAMS ((rtx));
1174
1175 /* Like copy_to_reg but always make the reg the specified mode MODE.  */
1176 extern rtx copy_to_mode_reg PARAMS ((enum machine_mode, rtx));
1177
1178 /* Copy given rtx to given temp reg and return that.  */
1179 extern rtx copy_to_suggested_reg PARAMS ((rtx, rtx, enum machine_mode));
1180
1181 /* Copy a value to a register if it isn't already a register.
1182    Args are mode (in case value is a constant) and the value.  */
1183 extern rtx force_reg PARAMS ((enum machine_mode, rtx));
1184
1185 /* Return given rtx, copied into a new temp reg if it was in memory.  */
1186 extern rtx force_not_mem PARAMS ((rtx));
1187
1188 #ifdef TREE_CODE
1189 /* Return mode and signedness to use when object is promoted.  */
1190 extern enum machine_mode promote_mode PARAMS ((tree, enum machine_mode,
1191                                                int *, int));
1192 #endif
1193
1194 /* Remove some bytes from the stack.  An rtx says how many.  */
1195 extern void adjust_stack PARAMS ((rtx));
1196
1197 /* Add some bytes to the stack.  An rtx says how many.  */
1198 extern void anti_adjust_stack PARAMS ((rtx));
1199
1200 /* This enum is used for the following two functions.  */
1201 enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
1202
1203 /* Save the stack pointer at the specified level.  */
1204 extern void emit_stack_save PARAMS ((enum save_level, rtx *, rtx));
1205
1206 /* Restore the stack pointer from a save area of the specified level.  */
1207 extern void emit_stack_restore PARAMS ((enum save_level, rtx, rtx));
1208
1209 /* Allocate some space on the stack dynamically and return its address.  An rtx
1210    says how many bytes.  */
1211 extern rtx allocate_dynamic_stack_space PARAMS ((rtx, rtx, int));
1212
1213 /* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
1214    FIRST is a constant and size is a Pmode RTX.  These are offsets from the
1215    current stack pointer.  STACK_GROWS_DOWNWARD says whether to add or
1216    subtract from the stack.  If SIZE is constant, this is done
1217    with a fixed number of probes.  Otherwise, we must make a loop.  */
1218 extern void probe_stack_range PARAMS ((HOST_WIDE_INT, rtx));
1219
1220 /* Return an rtx that refers to the value returned by a library call
1221    in its original home.  This becomes invalid if any more code is emitted.  */
1222 extern rtx hard_libcall_value PARAMS ((enum machine_mode));
1223
1224 /* Given an rtx, return an rtx for a value rounded up to a multiple
1225    of STACK_BOUNDARY / BITS_PER_UNIT.  */
1226 extern rtx round_push PARAMS ((rtx));
1227
1228 extern rtx store_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
1229                                     unsigned HOST_WIDE_INT,
1230                                     enum machine_mode, rtx,
1231                                     unsigned int, HOST_WIDE_INT));
1232 extern rtx extract_bit_field PARAMS ((rtx, unsigned HOST_WIDE_INT,
1233                                       unsigned HOST_WIDE_INT, int, rtx,
1234                                       enum machine_mode, enum machine_mode,
1235                                       unsigned int, HOST_WIDE_INT));
1236 extern rtx expand_mult PARAMS ((enum machine_mode, rtx, rtx, rtx, int));
1237 extern rtx expand_mult_add PARAMS ((rtx, rtx, rtx, rtx,enum machine_mode, int));
1238 extern rtx expand_mult_highpart_adjust PARAMS ((enum machine_mode, rtx, rtx, rtx, rtx, int));
1239
1240 extern rtx assemble_static_space PARAMS ((int));
1241
1242 /* Hook called by expand_expr for language-specific tree codes.
1243    It is up to the language front end to install a hook
1244    if it has any such codes that expand_expr needs to know about.  */
1245 extern rtx (*lang_expand_expr) PARAMS ((union tree_node *, rtx,
1246                                         enum machine_mode,
1247                                         enum expand_modifier modifier));
1248
1249 #ifdef TREE_CODE
1250 /* Hook called by output_constant for language-specific tree codes.
1251    It is up to the language front-end to install a hook if it has any
1252    such codes that output_constant needs to know about.  Returns a
1253    language-independent constant equivalent to its input.  */
1254 extern tree (*lang_expand_constant) PARAMS ((tree));
1255
1256 extern int safe_from_p PARAMS ((rtx, tree, int));
1257
1258 /* Hook called by safe_from_p for language-specific tree codes.  It is
1259    up to the language front-end to install a hook if it has any such
1260    codes that safe_from_p needs to know about.  Since same_from_p will
1261    recursively explore the TREE_OPERANDs of an expression, this hook
1262    should not reexamine those pieces.  This routine may recursively
1263    call safe_from_p; it should always pass `0' as the TOP_P
1264    parameter.  */
1265 extern int (*lang_safe_from_p) PARAMS ((rtx, tree));
1266 #endif
1267
1268 extern void init_all_optabs                     PARAMS ((void));
1269 extern void do_jump_by_parts_equality_rtx       PARAMS ((rtx, rtx, rtx));
1270 extern void do_jump_by_parts_greater_rtx        PARAMS ((enum machine_mode,
1271                                                          int, rtx, rtx, rtx,
1272                                                          rtx));
1273
1274 #ifdef TREE_CODE   /* Don't lose if tree.h not included.  */
1275 extern void mark_seen_cases                     PARAMS ((tree, unsigned char *,
1276                                                          HOST_WIDE_INT, int));
1277 #endif