gcc/expr.h

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