gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC 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 GCC 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 GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef GCC_OPTABS_H
  23 #define GCC_OPTABS_H
  24
  25 #include "insn-codes.h"
  26
  27 /* Optabs are tables saying how to generate insn bodies
  28    for various machine modes and numbers of operands.
  29    Each optab applies to one operation.
  30    For example, add_optab applies to addition.
  31
  32    The insn_code slot is the enum insn_code that says how to
  33    generate an insn for this operation on a particular machine mode.
  34    It is CODE_FOR_nothing if there is no such insn on the target machine.
  35
  36    The `lib_call' slot is the name of the library function that
  37    can be used to perform the operation.
  38
  39    A few optabs, such as move_optab and cmp_optab, are used
  40    by special code.  */
  41
  42 struct optab_handlers GTY(())
  43 {
  44   enum insn_code insn_code;
  45   rtx libfunc;
  46 };
  47
  48 struct optab GTY(())
  49 {
  50   enum rtx_code code;
  51   struct optab_handlers handlers[NUM_MACHINE_MODES];
  52 };
  53 typedef struct optab * optab;
  54
  55 /* A convert_optab is for some sort of conversion operation between
  56    modes.  The first array index is the destination mode, the second
  57    is the source mode.  */
  58 struct convert_optab GTY(())
  59 {
  60   enum rtx_code code;
  61   struct optab_handlers handlers[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
  62 };
  63 typedef struct convert_optab *convert_optab;
  64
  65 /* Given an enum insn_code, access the function to construct
  66    the body of that kind of insn.  */
  67 #define GEN_FCN(CODE) (insn_data[CODE].genfun)
  68
  69 /* Enumeration of valid indexes into optab_table.  */
  70 enum optab_index
  71 {
  72   OTI_add,
  73   OTI_addv,
  74   OTI_sub,
  75   OTI_subv,
  76
  77   /* Signed and fp multiply */
  78   OTI_smul,
  79   OTI_smulv,
  80   /* Signed multiply, return high word */
  81   OTI_smul_highpart,
  82   OTI_umul_highpart,
  83   /* Signed multiply with result one machine mode wider than args */
  84   OTI_smul_widen,
  85   OTI_umul_widen,
  86   /* Widening multiply of one unsigned and one signed operand.  */
  87   OTI_usmul_widen,
  88
  89   /* Signed divide */
  90   OTI_sdiv,
  91   OTI_sdivv,
  92   /* Signed divide-and-remainder in one */
  93   OTI_sdivmod,
  94   OTI_udiv,
  95   OTI_udivmod,
  96   /* Signed remainder */
  97   OTI_smod,
  98   OTI_umod,
  99   /* Floating point remainder functions */
 100   OTI_fmod,
 101   OTI_drem,
 102   /* Convert float to integer in float fmt */
 103   OTI_ftrunc,
 104
 105   /* Logical and */
 106   OTI_and,
 107   /* Logical or */
 108   OTI_ior,
 109   /* Logical xor */
 110   OTI_xor,
 111
 112   /* Arithmetic shift left */
 113   OTI_ashl,
 114   /* Logical shift right */
 115   OTI_lshr,
 116   /* Arithmetic shift right */
 117   OTI_ashr,
 118   /* Rotate left */
 119   OTI_rotl,
 120   /* Rotate right */
 121   OTI_rotr,
 122   /* Signed and floating-point minimum value */
 123   OTI_smin,
 124   /* Signed and floating-point maximum value */
 125   OTI_smax,
 126   /* Unsigned minimum value */
 127   OTI_umin,
 128   /* Unsigned maximum value */
 129   OTI_umax,
 130   /* Power */
 131   OTI_pow,
 132   /* Arc tangent of y/x */
 133   OTI_atan2,
 134
 135   /* Move instruction.  */
 136   OTI_mov,
 137   /* Move, preserving high part of register.  */
 138   OTI_movstrict,
 139   /* Move, with a misaligned memory.  */
 140   OTI_movmisalign,
 141
 142   /* Unary operations */
 143   /* Negation */
 144   OTI_neg,
 145   OTI_negv,
 146   /* Abs value */
 147   OTI_abs,
 148   OTI_absv,
 149   /* Bitwise not */
 150   OTI_one_cmpl,
 151   /* Bit scanning and counting */
 152   OTI_ffs,
 153   OTI_clz,
 154   OTI_ctz,
 155   OTI_popcount,
 156   OTI_parity,
 157   /* Square root */
 158   OTI_sqrt,
 159   /* Sine-Cosine */
 160   OTI_sincos,
 161   /* Sine */
 162   OTI_sin,
 163   /* Inverse sine */
 164   OTI_asin,
 165   /* Cosine */
 166   OTI_cos,
 167   /* Inverse cosine */
 168   OTI_acos,
 169   /* Exponential */
 170   OTI_exp,
 171   /* Base-10 Exponential */
 172   OTI_exp10,
 173   /* Base-2 Exponential */
 174   OTI_exp2,
 175   /* Exponential - 1*/
 176   OTI_expm1,
 177   /* Load exponent of a floating point number */
 178   OTI_ldexp,
 179   /* Radix-independent exponent */
 180   OTI_logb,
 181   OTI_ilogb,
 182   /* Natural Logarithm */
 183   OTI_log,
 184   /* Base-10 Logarithm */
 185   OTI_log10,
 186   /* Base-2 Logarithm */
 187   OTI_log2,
 188   /* logarithm of 1 plus argument */
 189   OTI_log1p,
 190   /* Rounding functions */
 191   OTI_floor,
 192   OTI_lfloor,
 193   OTI_ceil,
 194   OTI_lceil,
 195   OTI_btrunc,
 196   OTI_round,
 197   OTI_nearbyint,
 198   OTI_rint,
 199   OTI_lrint,
 200   /* Tangent */
 201   OTI_tan,
 202   /* Inverse tangent */
 203   OTI_atan,
 204   /* Copy sign */
 205   OTI_copysign,
 206
 207   /* Compare insn; two operands.  */
 208   OTI_cmp,
 209   /* Used only for libcalls for unsigned comparisons.  */
 210   OTI_ucmp,
 211   /* tst insn; compare one operand against 0 */
 212   OTI_tst,
 213
 214   /* Floating point comparison optabs - used primarily for libfuncs */
 215   OTI_eq,
 216   OTI_ne,
 217   OTI_gt,
 218   OTI_ge,
 219   OTI_lt,
 220   OTI_le,
 221   OTI_unord,
 222
 223   /* String length */
 224   OTI_strlen,
 225
 226   /* Combined compare & jump/store flags/move operations.  */
 227   OTI_cbranch,
 228   OTI_cmov,
 229   OTI_cstore,
 230
 231   /* Push instruction.  */
 232   OTI_push,
 233
 234   /* Conditional add instruction.  */
 235   OTI_addcc,
 236
 237   /* Reduction operations on a vector operand.  */
 238   OTI_reduc_smax,
 239   OTI_reduc_umax,
 240   OTI_reduc_smin,
 241   OTI_reduc_umin,
 242   OTI_reduc_splus,
 243   OTI_reduc_uplus,
 244
 245   /* Summation, with result machine mode one or more wider than args.  */
 246   OTI_ssum_widen,
 247   OTI_usum_widen,
 248
 249   /* Dot product, with result machine mode one or more wider than args.  */
 250   OTI_sdot_prod,
 251   OTI_udot_prod,
 252
 253   /* Set specified field of vector operand.  */
 254   OTI_vec_set,
 255   /* Extract specified field of vector operand.  */
 256   OTI_vec_extract,
 257   /* Initialize vector operand.  */
 258   OTI_vec_init,
 259   /* Whole vector shift. The shift amount is in bits.  */
 260   OTI_vec_shl,
 261   OTI_vec_shr,
 262   /* Extract specified elements from vectors, for vector load.  */
 263   OTI_vec_realign_load,
 264
 265   /* Perform a raise to the power of integer.  */
 266   OTI_powi,
 267
 268   OTI_MAX
 269 };
 270
 271 extern GTY(()) optab optab_table[OTI_MAX];
 272
 273 #define add_optab (optab_table[OTI_add])
 274 #define sub_optab (optab_table[OTI_sub])
 275 #define smul_optab (optab_table[OTI_smul])
 276 #define addv_optab (optab_table[OTI_addv])
 277 #define subv_optab (optab_table[OTI_subv])
 278 #define smul_highpart_optab (optab_table[OTI_smul_highpart])
 279 #define umul_highpart_optab (optab_table[OTI_umul_highpart])
 280 #define smul_widen_optab (optab_table[OTI_smul_widen])
 281 #define umul_widen_optab (optab_table[OTI_umul_widen])
 282 #define usmul_widen_optab (optab_table[OTI_usmul_widen])
 283 #define sdiv_optab (optab_table[OTI_sdiv])
 284 #define smulv_optab (optab_table[OTI_smulv])
 285 #define sdivv_optab (optab_table[OTI_sdivv])
 286 #define sdivmod_optab (optab_table[OTI_sdivmod])
 287 #define udiv_optab (optab_table[OTI_udiv])
 288 #define udivmod_optab (optab_table[OTI_udivmod])
 289 #define smod_optab (optab_table[OTI_smod])
 290 #define umod_optab (optab_table[OTI_umod])
 291 #define fmod_optab (optab_table[OTI_fmod])
 292 #define drem_optab (optab_table[OTI_drem])
 293 #define ftrunc_optab (optab_table[OTI_ftrunc])
 294 #define and_optab (optab_table[OTI_and])
 295 #define ior_optab (optab_table[OTI_ior])
 296 #define xor_optab (optab_table[OTI_xor])
 297 #define ashl_optab (optab_table[OTI_ashl])
 298 #define lshr_optab (optab_table[OTI_lshr])
 299 #define ashr_optab (optab_table[OTI_ashr])
 300 #define rotl_optab (optab_table[OTI_rotl])
 301 #define rotr_optab (optab_table[OTI_rotr])
 302 #define smin_optab (optab_table[OTI_smin])
 303 #define smax_optab (optab_table[OTI_smax])
 304 #define umin_optab (optab_table[OTI_umin])
 305 #define umax_optab (optab_table[OTI_umax])
 306 #define pow_optab (optab_table[OTI_pow])
 307 #define atan2_optab (optab_table[OTI_atan2])
 308
 309 #define mov_optab (optab_table[OTI_mov])
 310 #define movstrict_optab (optab_table[OTI_movstrict])
 311 #define movmisalign_optab (optab_table[OTI_movmisalign])
 312
 313 #define neg_optab (optab_table[OTI_neg])
 314 #define negv_optab (optab_table[OTI_negv])
 315 #define abs_optab (optab_table[OTI_abs])
 316 #define absv_optab (optab_table[OTI_absv])
 317 #define one_cmpl_optab (optab_table[OTI_one_cmpl])
 318 #define ffs_optab (optab_table[OTI_ffs])
 319 #define clz_optab (optab_table[OTI_clz])
 320 #define ctz_optab (optab_table[OTI_ctz])
 321 #define popcount_optab (optab_table[OTI_popcount])
 322 #define parity_optab (optab_table[OTI_parity])
 323 #define sqrt_optab (optab_table[OTI_sqrt])
 324 #define sincos_optab (optab_table[OTI_sincos])
 325 #define sin_optab (optab_table[OTI_sin])
 326 #define asin_optab (optab_table[OTI_asin])
 327 #define cos_optab (optab_table[OTI_cos])
 328 #define acos_optab (optab_table[OTI_acos])
 329 #define exp_optab (optab_table[OTI_exp])
 330 #define exp10_optab (optab_table[OTI_exp10])
 331 #define exp2_optab (optab_table[OTI_exp2])
 332 #define expm1_optab (optab_table[OTI_expm1])
 333 #define ldexp_optab (optab_table[OTI_ldexp])
 334 #define logb_optab (optab_table[OTI_logb])
 335 #define ilogb_optab (optab_table[OTI_ilogb])
 336 #define log_optab (optab_table[OTI_log])
 337 #define log10_optab (optab_table[OTI_log10])
 338 #define log2_optab (optab_table[OTI_log2])
 339 #define log1p_optab (optab_table[OTI_log1p])
 340 #define floor_optab (optab_table[OTI_floor])
 341 #define lfloor_optab (optab_table[OTI_lfloor])
 342 #define ceil_optab (optab_table[OTI_ceil])
 343 #define lceil_optab (optab_table[OTI_lceil])
 344 #define btrunc_optab (optab_table[OTI_btrunc])
 345 #define round_optab (optab_table[OTI_round])
 346 #define nearbyint_optab (optab_table[OTI_nearbyint])
 347 #define rint_optab (optab_table[OTI_rint])
 348 #define lrint_optab (optab_table[OTI_lrint])
 349 #define tan_optab (optab_table[OTI_tan])
 350 #define atan_optab (optab_table[OTI_atan])
 351 #define copysign_optab (optab_table[OTI_copysign])
 352
 353 #define cmp_optab (optab_table[OTI_cmp])
 354 #define ucmp_optab (optab_table[OTI_ucmp])
 355 #define tst_optab (optab_table[OTI_tst])
 356
 357 #define eq_optab (optab_table[OTI_eq])
 358 #define ne_optab (optab_table[OTI_ne])
 359 #define gt_optab (optab_table[OTI_gt])
 360 #define ge_optab (optab_table[OTI_ge])
 361 #define lt_optab (optab_table[OTI_lt])
 362 #define le_optab (optab_table[OTI_le])
 363 #define unord_optab (optab_table[OTI_unord])
 364
 365 #define strlen_optab (optab_table[OTI_strlen])
 366
 367 #define cbranch_optab (optab_table[OTI_cbranch])
 368 #define cmov_optab (optab_table[OTI_cmov])
 369 #define cstore_optab (optab_table[OTI_cstore])
 370 #define push_optab (optab_table[OTI_push])
 371 #define addcc_optab (optab_table[OTI_addcc])
 372
 373 #define reduc_smax_optab (optab_table[OTI_reduc_smax])
 374 #define reduc_umax_optab (optab_table[OTI_reduc_umax])
 375 #define reduc_smin_optab (optab_table[OTI_reduc_smin])
 376 #define reduc_umin_optab (optab_table[OTI_reduc_umin])
 377 #define reduc_splus_optab (optab_table[OTI_reduc_splus])
 378 #define reduc_uplus_optab (optab_table[OTI_reduc_uplus])
 379
 380 #define ssum_widen_optab (optab_table[OTI_ssum_widen])
 381 #define usum_widen_optab (optab_table[OTI_usum_widen])
 382 #define sdot_prod_optab (optab_table[OTI_sdot_prod])
 383 #define udot_prod_optab (optab_table[OTI_udot_prod])
 384
 385 #define vec_set_optab (optab_table[OTI_vec_set])
 386 #define vec_extract_optab (optab_table[OTI_vec_extract])
 387 #define vec_init_optab (optab_table[OTI_vec_init])
 388 #define vec_shl_optab (optab_table[OTI_vec_shl])
 389 #define vec_shr_optab (optab_table[OTI_vec_shr])
 390 #define vec_realign_load_optab (optab_table[OTI_vec_realign_load])
 391
 392 #define powi_optab (optab_table[OTI_powi])
 393
 394 /* Conversion optabs have their own table and indexes.  */
 395 enum convert_optab_index
 396 {
 397   COI_sext,
 398   COI_zext,
 399   COI_trunc,
 400
 401   COI_sfix,
 402   COI_ufix,
 403
 404   COI_sfixtrunc,
 405   COI_ufixtrunc,
 406
 407   COI_sfloat,
 408   COI_ufloat,
 409
 410   COI_MAX
 411 };
 412
 413 extern GTY(()) convert_optab convert_optab_table[COI_MAX];
 414
 415 #define sext_optab (convert_optab_table[COI_sext])
 416 #define zext_optab (convert_optab_table[COI_zext])
 417 #define trunc_optab (convert_optab_table[COI_trunc])
 418 #define sfix_optab (convert_optab_table[COI_sfix])
 419 #define ufix_optab (convert_optab_table[COI_ufix])
 420 #define sfixtrunc_optab (convert_optab_table[COI_sfixtrunc])
 421 #define ufixtrunc_optab (convert_optab_table[COI_ufixtrunc])
 422 #define sfloat_optab (convert_optab_table[COI_sfloat])
 423 #define ufloat_optab (convert_optab_table[COI_ufloat])
 424
 425 /* These arrays record the insn_code of insns that may be needed to
 426    perform input and output reloads of special objects.  They provide a
 427    place to pass a scratch register.  */
 428 extern enum insn_code reload_in_optab[NUM_MACHINE_MODES];
 429 extern enum insn_code reload_out_optab[NUM_MACHINE_MODES];
 430
 431 /* Contains the optab used for each rtx code.  */
 432 extern GTY(()) optab code_to_optab[NUM_RTX_CODE + 1];
 433
 434 \f
 435 typedef rtx (*rtxfun) (rtx);
 436
 437 /* Indexed by the rtx-code for a conditional (e.g. EQ, LT,...)
 438    gives the gen_function to make a branch to test that condition.  */
 439
 440 extern rtxfun bcc_gen_fctn[NUM_RTX_CODE];
 441
 442 /* Indexed by the rtx-code for a conditional (e.g. EQ, LT,...)
 443    gives the insn code to make a store-condition insn
 444    to test that condition.  */
 445
 446 extern enum insn_code setcc_gen_code[NUM_RTX_CODE];
 447
 448 #ifdef HAVE_conditional_move
 449 /* Indexed by the machine mode, gives the insn code to make a conditional
 450    move insn.  */
 451
 452 extern enum insn_code movcc_gen_code[NUM_MACHINE_MODES];
 453 #endif
 454
 455 /* Indexed by the machine mode, gives the insn code for vector conditional
 456    operation.  */
 457
 458 extern enum insn_code vcond_gen_code[NUM_MACHINE_MODES];
 459 extern enum insn_code vcondu_gen_code[NUM_MACHINE_MODES];
 460
 461 /* This array records the insn_code of insns to perform block moves.  */
 462 extern enum insn_code movmem_optab[NUM_MACHINE_MODES];
 463
 464 /* This array records the insn_code of insns to perform block sets.  */
 465 extern enum insn_code setmem_optab[NUM_MACHINE_MODES];
 466
 467 /* These arrays record the insn_code of two different kinds of insns
 468    to perform block compares.  */
 469 extern enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
 470 extern enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
 471 extern enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
 472
 473 /* Synchronization primitives.  This first set is atomic operation for
 474    which we don't care about the resulting value.  */
 475 extern enum insn_code sync_add_optab[NUM_MACHINE_MODES];
 476 extern enum insn_code sync_sub_optab[NUM_MACHINE_MODES];
 477 extern enum insn_code sync_ior_optab[NUM_MACHINE_MODES];
 478 extern enum insn_code sync_and_optab[NUM_MACHINE_MODES];
 479 extern enum insn_code sync_xor_optab[NUM_MACHINE_MODES];
 480 extern enum insn_code sync_nand_optab[NUM_MACHINE_MODES];
 481
 482 /* This second set is atomic operations in which we return the value
 483    that existed in memory before the operation.  */
 484 extern enum insn_code sync_old_add_optab[NUM_MACHINE_MODES];
 485 extern enum insn_code sync_old_sub_optab[NUM_MACHINE_MODES];
 486 extern enum insn_code sync_old_ior_optab[NUM_MACHINE_MODES];
 487 extern enum insn_code sync_old_and_optab[NUM_MACHINE_MODES];
 488 extern enum insn_code sync_old_xor_optab[NUM_MACHINE_MODES];
 489 extern enum insn_code sync_old_nand_optab[NUM_MACHINE_MODES];
 490
 491 /* This third set is atomic operations in which we return the value
 492    that resulted after performing the operation.  */
 493 extern enum insn_code sync_new_add_optab[NUM_MACHINE_MODES];
 494 extern enum insn_code sync_new_sub_optab[NUM_MACHINE_MODES];
 495 extern enum insn_code sync_new_ior_optab[NUM_MACHINE_MODES];
 496 extern enum insn_code sync_new_and_optab[NUM_MACHINE_MODES];
 497 extern enum insn_code sync_new_xor_optab[NUM_MACHINE_MODES];
 498 extern enum insn_code sync_new_nand_optab[NUM_MACHINE_MODES];
 499
 500 /* Atomic compare and swap.  */
 501 extern enum insn_code sync_compare_and_swap[NUM_MACHINE_MODES];
 502 extern enum insn_code sync_compare_and_swap_cc[NUM_MACHINE_MODES];
 503
 504 /* Atomic exchange with acquire semantics.  */
 505 extern enum insn_code sync_lock_test_and_set[NUM_MACHINE_MODES];
 506
 507 /* Atomic clear with release semantics.  */
 508 extern enum insn_code sync_lock_release[NUM_MACHINE_MODES];
 509
 510 /* Define functions given in optabs.c.  */
 511
 512 extern rtx expand_widen_pattern_expr (tree exp, rtx op0, rtx op1, rtx wide_op,
 513                                       rtx target, int unsignedp);
 514
 515 extern rtx expand_ternary_op (enum machine_mode mode, optab ternary_optab,
 516                               rtx op0, rtx op1, rtx op2, rtx target,
 517                               int unsignedp);
 518
 519 /* Expand a binary operation given optab and rtx operands.  */
 520 extern rtx expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 521                          enum optab_methods);
 522
 523 extern bool force_expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 524                                 enum optab_methods);
 525
 526 /* Expand a binary operation with both signed and unsigned forms.  */
 527 extern rtx sign_expand_binop (enum machine_mode, optab, optab, rtx, rtx,
 528                               rtx, int, enum optab_methods);
 529
 530 /* Generate code to perform an operation on one operand with two results.  */
 531 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 532
 533 /* Generate code to perform an operation on two operands with two results.  */
 534 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 535
 536 /* Generate code to perform an operation on two operands with two
 537    results, using a library function.  */
 538 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 539                                          enum rtx_code);
 540
 541 /* Expand a unary arithmetic operation given optab rtx operand.  */
 542 extern rtx expand_unop (enum machine_mode, optab, rtx, rtx, int);
 543
 544 /* Expand the absolute value operation.  */
 545 extern rtx expand_abs_nojump (enum machine_mode, rtx, rtx, int);
 546 extern rtx expand_abs (enum machine_mode, rtx, rtx, int, int);
 547
 548 /* Expand the copysign operation.  */
 549 extern rtx expand_copysign (rtx, rtx, rtx);
 550
 551 /* Generate an instruction with a given INSN_CODE with an output and
 552    an input.  */
 553 extern void emit_unop_insn (int, rtx, rtx, enum rtx_code);
 554
 555 /* Emit code to perform a series of operations on a multi-word quantity, one
 556    word at a time.  */
 557 extern rtx emit_no_conflict_block (rtx, rtx, rtx, rtx, rtx);
 558
 559 /* Emit one rtl insn to compare two rtx's.  */
 560 extern void emit_cmp_insn (rtx, rtx, enum rtx_code, rtx, enum machine_mode,
 561                            int);
 562
 563 /* The various uses that a comparison can have; used by can_compare_p:
 564    jumps, conditional moves, store flag operations.  */
 565 enum can_compare_purpose
 566 {
 567   ccp_jump,
 568   ccp_cmov,
 569   ccp_store_flag
 570 };
 571
 572 /* Return the optab used for computing the given operation on the type
 573    given by the second argument.  */
 574 extern optab optab_for_tree_code (enum tree_code, tree);
 575
 576 /* Nonzero if a compare of mode MODE can be done straightforwardly
 577    (without splitting it into pieces).  */
 578 extern int can_compare_p (enum rtx_code, enum machine_mode,
 579                           enum can_compare_purpose);
 580
 581 /* Return the INSN_CODE to use for an extend operation.  */
 582 extern enum insn_code can_extend_p (enum machine_mode, enum machine_mode, int);
 583
 584 /* Generate the body of an insn to extend Y (with mode MFROM)
 585    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 586 extern rtx gen_extend_insn (rtx, rtx, enum machine_mode,
 587                             enum machine_mode, int);
 588
 589 /* Call this to reset the function entry for one optab.  */
 590 extern void set_optab_libfunc (optab, enum machine_mode, const char *);
 591 extern void set_conv_libfunc (convert_optab, enum machine_mode,
 592                               enum machine_mode, const char *);
 593
 594 /* Generate code for a FLOAT_EXPR.  */
 595 extern void expand_float (rtx, rtx, int);
 596
 597 /* Generate code for a FIX_EXPR.  */
 598 extern void expand_fix (rtx, rtx, int);
 599
 600 /* Return tree if target supports vector operations for COND_EXPR.  */
 601 bool expand_vec_cond_expr_p (tree, enum machine_mode);
 602
 603 /* Generate code for VEC_COND_EXPR.  */
 604 extern rtx expand_vec_cond_expr (tree, rtx);
 605
 606 /* Generate code for VEC_LSHIFT_EXPR and VEC_RSHIFT_EXPR.  */
 607 extern rtx expand_vec_shift_expr (tree, rtx);
 608
 609 #endif /* GCC_OPTABS_H */