gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC 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 GCC 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 GCC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 #ifndef GCC_OPTABS_H
  22 #define GCC_OPTABS_H
  23
  24 #include "insn-codes.h"
  25
  26 /* Optabs are tables saying how to generate insn bodies
  27    for various machine modes and numbers of operands.
  28    Each optab applies to one operation.
  29    For example, add_optab applies to addition.
  30
  31    The insn_code slot is the enum insn_code that says how to
  32    generate an insn for this operation on a particular machine mode.
  33    It is CODE_FOR_nothing if there is no such insn on the target machine.
  34
  35    The `lib_call' slot is the name of the library function that
  36    can be used to perform the operation.
  37
  38    A few optabs, such as move_optab and cmp_optab, are used
  39    by special code.  */
  40
  41 struct optab_handlers GTY(())
  42 {
  43   enum insn_code insn_code;
  44   rtx libfunc;
  45 };
  46
  47 struct optab GTY(())
  48 {
  49   enum rtx_code code;
  50   struct optab_handlers handlers[NUM_MACHINE_MODES];
  51 };
  52 typedef struct optab * optab;
  53
  54 /* A convert_optab is for some sort of conversion operation between
  55    modes.  The first array index is the destination mode, the second
  56    is the source mode.  */
  57 struct convert_optab GTY(())
  58 {
  59   enum rtx_code code;
  60   struct optab_handlers handlers[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
  61 };
  62 typedef struct convert_optab *convert_optab;
  63
  64 /* Given an enum insn_code, access the function to construct
  65    the body of that kind of insn.  */
  66 #define GEN_FCN(CODE) (insn_data[CODE].genfun)
  67
  68 /* Enumeration of valid indexes into optab_table.  */
  69 enum optab_index
  70 {
  71   OTI_add,
  72   OTI_addv,
  73   OTI_sub,
  74   OTI_subv,
  75
  76   /* Signed and fp multiply */
  77   OTI_smul,
  78   OTI_smulv,
  79   /* Signed multiply, return high word */
  80   OTI_smul_highpart,
  81   OTI_umul_highpart,
  82   /* Signed multiply with result one machine mode wider than args */
  83   OTI_smul_widen,
  84   OTI_umul_widen,
  85   /* Widening multiply of one unsigned and one signed operand.  */
  86   OTI_usmul_widen,
  87
  88   /* Signed divide */
  89   OTI_sdiv,
  90   OTI_sdivv,
  91   /* Signed divide-and-remainder in one */
  92   OTI_sdivmod,
  93   OTI_udiv,
  94   OTI_udivmod,
  95   /* Signed remainder */
  96   OTI_smod,
  97   OTI_umod,
  98   /* Floating point remainder functions */
  99   OTI_fmod,
 100   OTI_drem,
 101   /* Convert float to integer in float fmt */
 102   OTI_ftrunc,
 103
 104   /* Logical and */
 105   OTI_and,
 106   /* Logical or */
 107   OTI_ior,
 108   /* Logical xor */
 109   OTI_xor,
 110
 111   /* Arithmetic shift left */
 112   OTI_ashl,
 113   /* Logical shift right */
 114   OTI_lshr,
 115   /* Arithmetic shift right */
 116   OTI_ashr,
 117   /* Rotate left */
 118   OTI_rotl,
 119   /* Rotate right */
 120   OTI_rotr,
 121   /* Signed and floating-point minimum value */
 122   OTI_smin,
 123   /* Signed and floating-point maximum value */
 124   OTI_smax,
 125   /* Unsigned minimum value */
 126   OTI_umin,
 127   /* Unsigned maximum value */
 128   OTI_umax,
 129   /* Power */
 130   OTI_pow,
 131   /* Arc tangent of y/x */
 132   OTI_atan2,
 133
 134   /* Move instruction.  */
 135   OTI_mov,
 136   /* Move, preserving high part of register.  */
 137   OTI_movstrict,
 138   /* Move, with a misaligned memory.  */
 139   OTI_movmisalign,
 140
 141   /* Unary operations */
 142   /* Negation */
 143   OTI_neg,
 144   OTI_negv,
 145   /* Abs value */
 146   OTI_abs,
 147   OTI_absv,
 148   /* Bitwise not */
 149   OTI_one_cmpl,
 150   /* Bit scanning and counting */
 151   OTI_ffs,
 152   OTI_clz,
 153   OTI_ctz,
 154   OTI_popcount,
 155   OTI_parity,
 156   /* Square root */
 157   OTI_sqrt,
 158   /* Sine-Cosine */
 159   OTI_sincos,
 160   /* Sine */
 161   OTI_sin,
 162   /* Inverse sine */
 163   OTI_asin,
 164   /* Cosine */
 165   OTI_cos,
 166   /* Inverse cosine */
 167   OTI_acos,
 168   /* Exponential */
 169   OTI_exp,
 170   /* Base-10 Exponential */
 171   OTI_exp10,
 172   /* Base-2 Exponential */
 173   OTI_exp2,
 174   /* Exponential - 1*/
 175   OTI_expm1,
 176   /* Load exponent of a floating point number */
 177   OTI_ldexp,
 178   /* Radix-independent exponent */
 179   OTI_logb,
 180   OTI_ilogb,
 181   /* Natural Logarithm */
 182   OTI_log,
 183   /* Base-10 Logarithm */
 184   OTI_log10,
 185   /* Base-2 Logarithm */
 186   OTI_log2,
 187   /* logarithm of 1 plus argument */
 188   OTI_log1p,
 189   /* Rounding functions */
 190   OTI_floor,
 191   OTI_lfloor,
 192   OTI_ceil,
 193   OTI_lceil,
 194   OTI_btrunc,
 195   OTI_round,
 196   OTI_nearbyint,
 197   OTI_rint,
 198   OTI_lrint,
 199   /* Tangent */
 200   OTI_tan,
 201   /* Inverse tangent */
 202   OTI_atan,
 203   /* Copy sign */
 204   OTI_copysign,
 205
 206   /* Compare insn; two operands.  */
 207   OTI_cmp,
 208   /* Used only for libcalls for unsigned comparisons.  */
 209   OTI_ucmp,
 210   /* tst insn; compare one operand against 0 */
 211   OTI_tst,
 212
 213   /* Floating point comparison optabs - used primarily for libfuncs */
 214   OTI_eq,
 215   OTI_ne,
 216   OTI_gt,
 217   OTI_ge,
 218   OTI_lt,
 219   OTI_le,
 220   OTI_unord,
 221
 222   /* String length */
 223   OTI_strlen,
 224
 225   /* Combined compare & jump/store flags/move operations.  */
 226   OTI_cbranch,
 227   OTI_cmov,
 228   OTI_cstore,
 229
 230   /* Push instruction.  */
 231   OTI_push,
 232
 233   /* Conditional add instruction.  */
 234   OTI_addcc,
 235
 236   /* Reduction operations on a vector operand.  */
 237   OTI_reduc_smax,
 238   OTI_reduc_umax,
 239   OTI_reduc_smin,
 240   OTI_reduc_umin,
 241   OTI_reduc_splus,
 242   OTI_reduc_uplus,
 243
 244   /* Set specified field of vector operand.  */
 245   OTI_vec_set,
 246   /* Extract specified field of vector operand.  */
 247   OTI_vec_extract,
 248   /* Initialize vector operand.  */
 249   OTI_vec_init,
 250   /* Whole vector shift. The shift amount is in bits.  */
 251   OTI_vec_shl,
 252   OTI_vec_shr,
 253   /* Extract specified elements from vectors, for vector load.  */
 254   OTI_vec_realign_load,
 255
 256   /* Perform a raise to the power of integer.  */
 257   OTI_powi,
 258
 259   OTI_MAX
 260 };
 261
 262 extern GTY(()) optab optab_table[OTI_MAX];
 263
 264 #define add_optab (optab_table[OTI_add])
 265 #define sub_optab (optab_table[OTI_sub])
 266 #define smul_optab (optab_table[OTI_smul])
 267 #define addv_optab (optab_table[OTI_addv])
 268 #define subv_optab (optab_table[OTI_subv])
 269 #define smul_highpart_optab (optab_table[OTI_smul_highpart])
 270 #define umul_highpart_optab (optab_table[OTI_umul_highpart])
 271 #define smul_widen_optab (optab_table[OTI_smul_widen])
 272 #define umul_widen_optab (optab_table[OTI_umul_widen])
 273 #define usmul_widen_optab (optab_table[OTI_usmul_widen])
 274 #define sdiv_optab (optab_table[OTI_sdiv])
 275 #define smulv_optab (optab_table[OTI_smulv])
 276 #define sdivv_optab (optab_table[OTI_sdivv])
 277 #define sdivmod_optab (optab_table[OTI_sdivmod])
 278 #define udiv_optab (optab_table[OTI_udiv])
 279 #define udivmod_optab (optab_table[OTI_udivmod])
 280 #define smod_optab (optab_table[OTI_smod])
 281 #define umod_optab (optab_table[OTI_umod])
 282 #define fmod_optab (optab_table[OTI_fmod])
 283 #define drem_optab (optab_table[OTI_drem])
 284 #define ftrunc_optab (optab_table[OTI_ftrunc])
 285 #define and_optab (optab_table[OTI_and])
 286 #define ior_optab (optab_table[OTI_ior])
 287 #define xor_optab (optab_table[OTI_xor])
 288 #define ashl_optab (optab_table[OTI_ashl])
 289 #define lshr_optab (optab_table[OTI_lshr])
 290 #define ashr_optab (optab_table[OTI_ashr])
 291 #define rotl_optab (optab_table[OTI_rotl])
 292 #define rotr_optab (optab_table[OTI_rotr])
 293 #define smin_optab (optab_table[OTI_smin])
 294 #define smax_optab (optab_table[OTI_smax])
 295 #define umin_optab (optab_table[OTI_umin])
 296 #define umax_optab (optab_table[OTI_umax])
 297 #define pow_optab (optab_table[OTI_pow])
 298 #define atan2_optab (optab_table[OTI_atan2])
 299
 300 #define mov_optab (optab_table[OTI_mov])
 301 #define movstrict_optab (optab_table[OTI_movstrict])
 302 #define movmisalign_optab (optab_table[OTI_movmisalign])
 303
 304 #define neg_optab (optab_table[OTI_neg])
 305 #define negv_optab (optab_table[OTI_negv])
 306 #define abs_optab (optab_table[OTI_abs])
 307 #define absv_optab (optab_table[OTI_absv])
 308 #define one_cmpl_optab (optab_table[OTI_one_cmpl])
 309 #define ffs_optab (optab_table[OTI_ffs])
 310 #define clz_optab (optab_table[OTI_clz])
 311 #define ctz_optab (optab_table[OTI_ctz])
 312 #define popcount_optab (optab_table[OTI_popcount])
 313 #define parity_optab (optab_table[OTI_parity])
 314 #define sqrt_optab (optab_table[OTI_sqrt])
 315 #define sincos_optab (optab_table[OTI_sincos])
 316 #define sin_optab (optab_table[OTI_sin])
 317 #define asin_optab (optab_table[OTI_asin])
 318 #define cos_optab (optab_table[OTI_cos])
 319 #define acos_optab (optab_table[OTI_acos])
 320 #define exp_optab (optab_table[OTI_exp])
 321 #define exp10_optab (optab_table[OTI_exp10])
 322 #define exp2_optab (optab_table[OTI_exp2])
 323 #define expm1_optab (optab_table[OTI_expm1])
 324 #define ldexp_optab (optab_table[OTI_ldexp])
 325 #define logb_optab (optab_table[OTI_logb])
 326 #define ilogb_optab (optab_table[OTI_ilogb])
 327 #define log_optab (optab_table[OTI_log])
 328 #define log10_optab (optab_table[OTI_log10])
 329 #define log2_optab (optab_table[OTI_log2])
 330 #define log1p_optab (optab_table[OTI_log1p])
 331 #define floor_optab (optab_table[OTI_floor])
 332 #define lfloor_optab (optab_table[OTI_lfloor])
 333 #define ceil_optab (optab_table[OTI_ceil])
 334 #define lceil_optab (optab_table[OTI_lceil])
 335 #define btrunc_optab (optab_table[OTI_btrunc])
 336 #define round_optab (optab_table[OTI_round])
 337 #define nearbyint_optab (optab_table[OTI_nearbyint])
 338 #define rint_optab (optab_table[OTI_rint])
 339 #define lrint_optab (optab_table[OTI_lrint])
 340 #define tan_optab (optab_table[OTI_tan])
 341 #define atan_optab (optab_table[OTI_atan])
 342 #define copysign_optab (optab_table[OTI_copysign])
 343
 344 #define cmp_optab (optab_table[OTI_cmp])
 345 #define ucmp_optab (optab_table[OTI_ucmp])
 346 #define tst_optab (optab_table[OTI_tst])
 347
 348 #define eq_optab (optab_table[OTI_eq])
 349 #define ne_optab (optab_table[OTI_ne])
 350 #define gt_optab (optab_table[OTI_gt])
 351 #define ge_optab (optab_table[OTI_ge])
 352 #define lt_optab (optab_table[OTI_lt])
 353 #define le_optab (optab_table[OTI_le])
 354 #define unord_optab (optab_table[OTI_unord])
 355
 356 #define strlen_optab (optab_table[OTI_strlen])
 357
 358 #define cbranch_optab (optab_table[OTI_cbranch])
 359 #define cmov_optab (optab_table[OTI_cmov])
 360 #define cstore_optab (optab_table[OTI_cstore])
 361 #define push_optab (optab_table[OTI_push])
 362 #define addcc_optab (optab_table[OTI_addcc])
 363
 364 #define reduc_smax_optab (optab_table[OTI_reduc_smax])
 365 #define reduc_umax_optab (optab_table[OTI_reduc_umax])
 366 #define reduc_smin_optab (optab_table[OTI_reduc_smin])
 367 #define reduc_umin_optab (optab_table[OTI_reduc_umin])
 368 #define reduc_splus_optab (optab_table[OTI_reduc_splus])
 369 #define reduc_uplus_optab (optab_table[OTI_reduc_uplus])
 370
 371 #define vec_set_optab (optab_table[OTI_vec_set])
 372 #define vec_extract_optab (optab_table[OTI_vec_extract])
 373 #define vec_init_optab (optab_table[OTI_vec_init])
 374 #define vec_shl_optab (optab_table[OTI_vec_shl])
 375 #define vec_shr_optab (optab_table[OTI_vec_shr])
 376 #define vec_realign_load_optab (optab_table[OTI_vec_realign_load])
 377
 378 #define powi_optab (optab_table[OTI_powi])
 379
 380 /* Conversion optabs have their own table and indexes.  */
 381 enum convert_optab_index
 382 {
 383   COI_sext,
 384   COI_zext,
 385   COI_trunc,
 386
 387   COI_sfix,
 388   COI_ufix,
 389
 390   COI_sfixtrunc,
 391   COI_ufixtrunc,
 392
 393   COI_sfloat,
 394   COI_ufloat,
 395
 396   COI_MAX
 397 };
 398
 399 extern GTY(()) convert_optab convert_optab_table[COI_MAX];
 400
 401 #define sext_optab (convert_optab_table[COI_sext])
 402 #define zext_optab (convert_optab_table[COI_zext])
 403 #define trunc_optab (convert_optab_table[COI_trunc])
 404 #define sfix_optab (convert_optab_table[COI_sfix])
 405 #define ufix_optab (convert_optab_table[COI_ufix])
 406 #define sfixtrunc_optab (convert_optab_table[COI_sfixtrunc])
 407 #define ufixtrunc_optab (convert_optab_table[COI_ufixtrunc])
 408 #define sfloat_optab (convert_optab_table[COI_sfloat])
 409 #define ufloat_optab (convert_optab_table[COI_ufloat])
 410
 411 /* These arrays record the insn_code of insns that may be needed to
 412    perform input and output reloads of special objects.  They provide a
 413    place to pass a scratch register.  */
 414 extern enum insn_code reload_in_optab[NUM_MACHINE_MODES];
 415 extern enum insn_code reload_out_optab[NUM_MACHINE_MODES];
 416
 417 /* Contains the optab used for each rtx code.  */
 418 extern GTY(()) optab code_to_optab[NUM_RTX_CODE + 1];
 419
 420 \f
 421 typedef rtx (*rtxfun) (rtx);
 422
 423 /* Indexed by the rtx-code for a conditional (e.g. EQ, LT,...)
 424    gives the gen_function to make a branch to test that condition.  */
 425
 426 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 427
 428 /* Indexed by the rtx-code for a conditional (e.g. EQ, LT,...)
 429    gives the insn code to make a store-condition insn
 430    to test that condition.  */
 431
 432 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 433
 434 #ifdef HAVE_conditional_move
 435 /* Indexed by the machine mode, gives the insn code to make a conditional
 436    move insn.  */
 437
 438 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 439 #endif
 440
 441 /* Indexed by the machine mode, gives the insn code for vector conditional
 442    operation.  */
 443
 444 extern enum insn_code vcond_gen_code[NUM_MACHINE_MODES];
 445 extern enum insn_code vcondu_gen_code[NUM_MACHINE_MODES];
 446
 447 /* This array records the insn_code of insns to perform block moves.  */
 448 extern enum insn_code movmem_optab[NUM_MACHINE_MODES];
 449
 450 /* This array records the insn_code of insns to perform block sets.  */
 451 extern enum insn_code setmem_optab[NUM_MACHINE_MODES];
 452
 453 /* These arrays record the insn_code of two different kinds of insns
 454    to perform block compares.  */
 455 extern enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
 456 extern enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
 457 extern enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
 458
 459 /* Synchronization primitives.  This first set is atomic operation for
 460    which we don't care about the resulting value.  */
 461 extern enum insn_code sync_add_optab[NUM_MACHINE_MODES];
 462 extern enum insn_code sync_sub_optab[NUM_MACHINE_MODES];
 463 extern enum insn_code sync_ior_optab[NUM_MACHINE_MODES];
 464 extern enum insn_code sync_and_optab[NUM_MACHINE_MODES];
 465 extern enum insn_code sync_xor_optab[NUM_MACHINE_MODES];
 466 extern enum insn_code sync_nand_optab[NUM_MACHINE_MODES];
 467
 468 /* This second set is atomic operations in which we return the value
 469    that existed in memory before the operation.  */
 470 extern enum insn_code sync_old_add_optab[NUM_MACHINE_MODES];
 471 extern enum insn_code sync_old_sub_optab[NUM_MACHINE_MODES];
 472 extern enum insn_code sync_old_ior_optab[NUM_MACHINE_MODES];
 473 extern enum insn_code sync_old_and_optab[NUM_MACHINE_MODES];
 474 extern enum insn_code sync_old_xor_optab[NUM_MACHINE_MODES];
 475 extern enum insn_code sync_old_nand_optab[NUM_MACHINE_MODES];
 476
 477 /* This third set is atomic operations in which we return the value
 478    that resulted after performing the operation.  */
 479 extern enum insn_code sync_new_add_optab[NUM_MACHINE_MODES];
 480 extern enum insn_code sync_new_sub_optab[NUM_MACHINE_MODES];
 481 extern enum insn_code sync_new_ior_optab[NUM_MACHINE_MODES];
 482 extern enum insn_code sync_new_and_optab[NUM_MACHINE_MODES];
 483 extern enum insn_code sync_new_xor_optab[NUM_MACHINE_MODES];
 484 extern enum insn_code sync_new_nand_optab[NUM_MACHINE_MODES];
 485
 486 /* Atomic compare and swap.  */
 487 extern enum insn_code sync_compare_and_swap[NUM_MACHINE_MODES];
 488 extern enum insn_code sync_compare_and_swap_cc[NUM_MACHINE_MODES];
 489
 490 /* Atomic exchange with acquire semantics.  */
 491 extern enum insn_code sync_lock_test_and_set[NUM_MACHINE_MODES];
 492
 493 /* Atomic clear with release semantics.  */
 494 extern enum insn_code sync_lock_release[NUM_MACHINE_MODES];
 495
 496 /* Define functions given in optabs.c.  */
 497
 498 extern rtx expand_ternary_op (enum machine_mode mode, optab ternary_optab,
 499                               rtx op0, rtx op1, rtx op2, rtx target,
 500                               int unsignedp);
 501
 502 /* Expand a binary operation given optab and rtx operands.  */
 503 extern rtx expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 504                          enum optab_methods);
 505
 506 extern bool force_expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 507                                 enum optab_methods);
 508
 509 /* Expand a binary operation with both signed and unsigned forms.  */
 510 extern rtx sign_expand_binop (enum machine_mode, optab, optab, rtx, rtx,
 511                               rtx, int, enum optab_methods);
 512
 513 /* Generate code to perform an operation on one operand with two results.  */
 514 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 515
 516 /* Generate code to perform an operation on two operands with two results.  */
 517 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 518
 519 /* Generate code to perform an operation on two operands with two
 520    results, using a library function.  */
 521 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 522                                          enum rtx_code);
 523
 524 /* Expand a unary arithmetic operation given optab rtx operand.  */
 525 extern rtx expand_unop (enum machine_mode, optab, rtx, rtx, int);
 526
 527 /* Expand the absolute value operation.  */
 528 extern rtx expand_abs_nojump (enum machine_mode, rtx, rtx, int);
 529 extern rtx expand_abs (enum machine_mode, rtx, rtx, int, int);
 530
 531 /* Expand the copysign operation.  */
 532 extern rtx expand_copysign (rtx, rtx, rtx);
 533
 534 /* Generate an instruction with a given INSN_CODE with an output and
 535    an input.  */
 536 extern void emit_unop_insn (int, rtx, rtx, enum rtx_code);
 537
 538 /* Emit code to perform a series of operations on a multi-word quantity, one
 539    word at a time.  */
 540 extern rtx emit_no_conflict_block (rtx, rtx, rtx, rtx, rtx);
 541
 542 /* Emit one rtl insn to compare two rtx's.  */
 543 extern void emit_cmp_insn (rtx, rtx, enum rtx_code, rtx, enum machine_mode,
 544                            int);
 545
 546 /* The various uses that a comparison can have; used by can_compare_p:
 547    jumps, conditional moves, store flag operations.  */
 548 enum can_compare_purpose
 549 {
 550   ccp_jump,
 551   ccp_cmov,
 552   ccp_store_flag
 553 };
 554
 555 /* Return the optab used for computing the given operation on the type
 556    given by the second argument.  */
 557 extern optab optab_for_tree_code (enum tree_code, tree);
 558
 559 /* Nonzero if a compare of mode MODE can be done straightforwardly
 560    (without splitting it into pieces).  */
 561 extern int can_compare_p (enum rtx_code, enum machine_mode,
 562                           enum can_compare_purpose);
 563
 564 /* Return the INSN_CODE to use for an extend operation.  */
 565 extern enum insn_code can_extend_p (enum machine_mode, enum machine_mode, int);
 566
 567 /* Generate the body of an insn to extend Y (with mode MFROM)
 568    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 569 extern rtx gen_extend_insn (rtx, rtx, enum machine_mode,
 570                             enum machine_mode, int);
 571
 572 /* Call this to reset the function entry for one optab.  */
 573 extern void set_optab_libfunc (optab, enum machine_mode, const char *);
 574 extern void set_conv_libfunc (convert_optab, enum machine_mode,
 575                               enum machine_mode, const char *);
 576
 577 /* Generate code for a FLOAT_EXPR.  */
 578 extern void expand_float (rtx, rtx, int);
 579
 580 /* Generate code for a FIX_EXPR.  */
 581 extern void expand_fix (rtx, rtx, int);
 582
 583 /* Return tree if target supports vector operations for COND_EXPR.  */
 584 bool expand_vec_cond_expr_p (tree, enum machine_mode);
 585
 586 /* Generate code for VEC_COND_EXPR.  */
 587 extern rtx expand_vec_cond_expr (tree, rtx);
 588
 589 /* Generate code for VEC_LSHIFT_EXPR and VEC_RSHIFT_EXPR.  */
 590 extern rtx expand_vec_shift_expr (tree, rtx);
 591
 592 #endif /* GCC_OPTABS_H */