gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001-2014 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_OPTABS_H
  21 #define GCC_OPTABS_H
  22
  23 #include "insn-codes.h"
  24 #include "insn-opinit.h"
  25
  26 typedef enum optab_tag optab;
  27 typedef enum optab_tag convert_optab;
  28 typedef enum optab_tag direct_optab;
  29
  30 struct optab_libcall_d
  31 {
  32   char libcall_suffix;
  33   const char *libcall_basename;
  34   void (*libcall_gen) (optab, const char *name,
  35                        char suffix, enum machine_mode);
  36 };
  37
  38 struct convert_optab_libcall_d
  39 {
  40   const char *libcall_basename;
  41   void (*libcall_gen) (convert_optab, const char *name,
  42                        enum machine_mode, enum machine_mode);
  43 };
  44
  45 /* Given an enum insn_code, access the function to construct
  46    the body of that kind of insn.  */
  47 #define GEN_FCN(CODE) (insn_data[CODE].genfun)
  48
  49 /* Contains the optab used for each rtx code, and vice-versa.  */
  50 extern const optab code_to_optab_[NUM_RTX_CODE];
  51 extern const enum rtx_code optab_to_code_[NUM_OPTABS];
  52
  53 static inline optab
  54 code_to_optab (enum rtx_code code)
  55 {
  56   return code_to_optab_[code];
  57 }
  58
  59 static inline enum rtx_code
  60 optab_to_code (optab op)
  61 {
  62   return optab_to_code_[op];
  63 }
  64
  65 extern const struct convert_optab_libcall_d convlib_def[NUM_CONVLIB_OPTABS];
  66 extern const struct optab_libcall_d normlib_def[NUM_NORMLIB_OPTABS];
  67
  68 /* Returns the active icode for the given (encoded) optab.  */
  69 extern enum insn_code raw_optab_handler (unsigned);
  70 extern bool swap_optab_enable (optab, enum machine_mode, bool);
  71
  72 /* Target-dependent globals.  */
  73 struct target_optabs {
  74   /* Patterns that are used by optabs that are enabled for this target.  */
  75   bool pat_enable[NUM_OPTAB_PATTERNS];
  76 };
  77
  78 extern struct target_optabs default_target_optabs;
  79 extern struct target_optabs *this_fn_optabs;
  80 #if SWITCHABLE_TARGET
  81 extern struct target_optabs *this_target_optabs;
  82 #else
  83 #define this_target_optabs (&default_target_optabs)
  84 #endif
  85 \f
  86 /* Define functions given in optabs.c.  */
  87
  88 extern rtx expand_widen_pattern_expr (sepops ops, rtx op0, rtx op1, rtx wide_op,
  89                                       rtx target, int unsignedp);
  90
  91 extern rtx expand_ternary_op (enum machine_mode mode, optab ternary_optab,
  92                               rtx op0, rtx op1, rtx op2, rtx target,
  93                               int unsignedp);
  94
  95 /* Expand a binary operation given optab and rtx operands.  */
  96 extern rtx expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
  97                          enum optab_methods);
  98
  99 extern rtx simplify_expand_binop (enum machine_mode mode, optab binoptab,
 100                                   rtx op0, rtx op1, rtx target, int unsignedp,
 101                                   enum optab_methods methods);
 102
 103 extern bool force_expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 104                                 enum optab_methods);
 105
 106 /* Expand a binary operation with both signed and unsigned forms.  */
 107 extern rtx sign_expand_binop (enum machine_mode, optab, optab, rtx, rtx,
 108                               rtx, int, enum optab_methods);
 109
 110 /* Generate code to perform an operation on one operand with two results.  */
 111 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 112
 113 /* Generate code to perform an operation on two operands with two results.  */
 114 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 115
 116 /* Generate code to perform an operation on two operands with two
 117    results, using a library function.  */
 118 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 119                                          enum rtx_code);
 120
 121 /* Expand a unary arithmetic operation given optab rtx operand.  */
 122 extern rtx expand_unop (enum machine_mode, optab, rtx, rtx, int);
 123
 124 /* Expand the absolute value operation.  */
 125 extern rtx expand_abs_nojump (enum machine_mode, rtx, rtx, int);
 126 extern rtx expand_abs (enum machine_mode, rtx, rtx, int, int);
 127
 128 /* Expand the one's complement absolute value operation.  */
 129 extern rtx expand_one_cmpl_abs_nojump (enum machine_mode, rtx, rtx);
 130
 131 /* Expand the copysign operation.  */
 132 extern rtx expand_copysign (rtx, rtx, rtx);
 133
 134 /* Generate an instruction with a given INSN_CODE with an output and
 135    an input.  */
 136 extern void emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 137 extern bool maybe_emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 138
 139 /* Find a widening optab even if it doesn't widen as much as we want.  */
 140 #define find_widening_optab_handler(A,B,C,D) \
 141   find_widening_optab_handler_and_mode (A, B, C, D, NULL)
 142 extern enum insn_code find_widening_optab_handler_and_mode (optab,
 143                                                             enum machine_mode,
 144                                                             enum machine_mode,
 145                                                             int,
 146                                                             enum machine_mode *);
 147 extern enum insn_code widening_optab_handler (optab, enum machine_mode,
 148                                               enum machine_mode);
 149
 150 /* An extra flag to control optab_for_tree_code's behavior.  This is needed to
 151    distinguish between machines with a vector shift that takes a scalar for the
 152    shift amount vs. machines that take a vector for the shift amount.  */
 153 enum optab_subtype
 154 {
 155   optab_default,
 156   optab_scalar,
 157   optab_vector
 158 };
 159
 160 /* Return the optab used for computing the given operation on the type given by
 161    the second argument.  The third argument distinguishes between the types of
 162    vector shifts and rotates */
 163 extern optab optab_for_tree_code (enum tree_code, const_tree, enum optab_subtype);
 164
 165 /* Given an optab that reduces a vector to a scalar, find instead the old
 166    optab that produces a vector with the reduction result in one element,
 167    for a tree with the specified type.  */
 168 extern optab scalar_reduc_to_vector (optab, const_tree type);
 169
 170 /* The various uses that a comparison can have; used by can_compare_p:
 171    jumps, conditional moves, store flag operations.  */
 172 enum can_compare_purpose
 173 {
 174   ccp_jump,
 175   ccp_cmov,
 176   ccp_store_flag
 177 };
 178
 179 /* Nonzero if a compare of mode MODE can be done straightforwardly
 180    (without splitting it into pieces).  */
 181 extern int can_compare_p (enum rtx_code, enum machine_mode,
 182                           enum can_compare_purpose);
 183
 184 /* Return the INSN_CODE to use for an extend operation.  */
 185 extern enum insn_code can_extend_p (enum machine_mode, enum machine_mode, int);
 186
 187 /* Generate the body of an insn to extend Y (with mode MFROM)
 188    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 189 extern rtx gen_extend_insn (rtx, rtx, enum machine_mode,
 190                             enum machine_mode, int);
 191
 192 /* Call this to reset the function entry for one optab.  */
 193 extern void set_optab_libfunc (optab, enum machine_mode, const char *);
 194 extern void set_conv_libfunc (convert_optab, enum machine_mode,
 195                               enum machine_mode, const char *);
 196
 197 /* Call this to install all of the __sync libcalls up to size MAX.  */
 198 extern void init_sync_libfuncs (int max);
 199
 200 /* Generate code for a FIXED_CONVERT_EXPR.  */
 201 extern void expand_fixed_convert (rtx, rtx, int, int);
 202
 203 /* Generate code for a FLOAT_EXPR.  */
 204 extern void expand_float (rtx, rtx, int);
 205
 206 /* Return the insn_code for a FLOAT_EXPR.  */
 207 enum insn_code can_float_p (enum machine_mode, enum machine_mode, int);
 208
 209 /* Return true if there is an inline compare and swap pattern.  */
 210 extern bool can_compare_and_swap_p (enum machine_mode, bool);
 211
 212 /* Return true if there is an inline atomic exchange pattern.  */
 213 extern bool can_atomic_exchange_p (enum machine_mode, bool);
 214
 215 /* Generate code for a compare and swap.  */
 216 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 217                                             enum memmodel, enum memmodel);
 218
 219 /* Generate memory barriers.  */
 220 extern void expand_mem_thread_fence (enum memmodel);
 221 extern void expand_mem_signal_fence (enum memmodel);
 222
 223 /* Check whether an operation represented by the code CODE is a
 224    convert operation that is supported by the target platform in
 225    vector form */
 226 bool supportable_convert_operation (enum tree_code, tree, tree, tree *,
 227                                     enum tree_code *);
 228
 229 /* Generate code for a FIX_EXPR.  */
 230 extern void expand_fix (rtx, rtx, int);
 231
 232 /* Generate code for float to integral conversion.  */
 233 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 234
 235 /* Generate code for a widening multiply.  */
 236 extern rtx expand_widening_mult (enum machine_mode, rtx, rtx, rtx, int, optab);
 237
 238 /* Return tree if target supports vector operations for COND_EXPR.  */
 239 bool expand_vec_cond_expr_p (tree, tree);
 240
 241 /* Generate code for VEC_COND_EXPR.  */
 242 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 243 /* Generate code for VEC_RSHIFT_EXPR.  */
 244 extern rtx expand_vec_shift_expr (sepops, rtx);
 245
 246 /* Return true if target supports vector operations for VEC_PERM_EXPR.  */
 247 extern bool can_vec_perm_p (enum machine_mode, bool, const unsigned char *);
 248
 249 /* Generate code for VEC_PERM_EXPR.  */
 250 extern rtx expand_vec_perm (enum machine_mode, rtx, rtx, rtx, rtx);
 251
 252 /* Return non-zero if target supports a given highpart multiplication.  */
 253 extern int can_mult_highpart_p (enum machine_mode, bool);
 254
 255 /* Generate code for MULT_HIGHPART_EXPR.  */
 256 extern rtx expand_mult_highpart (enum machine_mode, rtx, rtx, rtx, bool);
 257
 258 /* Return true if target supports vector masked load/store for mode.  */
 259 extern bool can_vec_mask_load_store_p (enum machine_mode, bool);
 260
 261 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 262    if the target does not have such an insn.  */
 263
 264 static inline enum insn_code
 265 optab_handler (optab op, enum machine_mode mode)
 266 {
 267   unsigned scode = (op << 16) | mode;
 268   gcc_assert (op > LAST_CONV_OPTAB);
 269   return raw_optab_handler (scode);
 270 }
 271
 272 /* Return the insn used to perform conversion OP from mode FROM_MODE
 273    to mode TO_MODE; return CODE_FOR_nothing if the target does not have
 274    such an insn.  */
 275
 276 static inline enum insn_code
 277 convert_optab_handler (convert_optab op, enum machine_mode to_mode,
 278                        enum machine_mode from_mode)
 279 {
 280   unsigned scode = (op << 16) | (from_mode << 8) | to_mode;
 281   gcc_assert (op > unknown_optab && op <= LAST_CONV_OPTAB);
 282   return raw_optab_handler (scode);
 283 }
 284
 285 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 286    if the target does not have such an insn.  */
 287
 288 static inline enum insn_code
 289 direct_optab_handler (direct_optab op, enum machine_mode mode)
 290 {
 291   return optab_handler (op, mode);
 292 }
 293
 294 /* Return true if UNOPTAB is for a trapping-on-overflow operation.  */
 295
 296 static inline bool
 297 trapv_unoptab_p (optab unoptab)
 298 {
 299   return (unoptab == negv_optab
 300           || unoptab == absv_optab);
 301 }
 302
 303 /* Return true if BINOPTAB is for a trapping-on-overflow operation.  */
 304
 305 static inline bool
 306 trapv_binoptab_p (optab binoptab)
 307 {
 308   return (binoptab == addv_optab
 309           || binoptab == subv_optab
 310           || binoptab == smulv_optab);
 311 }
 312
 313 extern rtx optab_libfunc (optab optab, enum machine_mode mode);
 314 extern rtx convert_optab_libfunc (convert_optab optab, enum machine_mode mode1,
 315                                   enum machine_mode mode2);
 316
 317 /* Describes an instruction that inserts or extracts a bitfield.  */
 318 struct extraction_insn
 319 {
 320   /* The code of the instruction.  */
 321   enum insn_code icode;
 322
 323   /* The mode that the structure operand should have.  This is byte_mode
 324      when using the legacy insv, extv and extzv patterns to access memory.  */
 325   enum machine_mode struct_mode;
 326
 327   /* The mode of the field to be inserted or extracted, and by extension
 328      the mode of the insertion or extraction itself.  */
 329   enum machine_mode field_mode;
 330
 331   /* The mode of the field's bit position.  This is only important
 332      when the position is variable rather than constant.  */
 333   enum machine_mode pos_mode;
 334 };
 335
 336 /* Enumerates the possible extraction_insn operations.  */
 337 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 338
 339 extern bool get_best_reg_extraction_insn (extraction_insn *,
 340                                           enum extraction_pattern,
 341                                           unsigned HOST_WIDE_INT,
 342                                           enum machine_mode);
 343
 344 extern bool get_best_mem_extraction_insn (extraction_insn *,
 345                                           enum extraction_pattern,
 346                                           HOST_WIDE_INT, HOST_WIDE_INT,
 347                                           enum machine_mode);
 348
 349 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 350                                   rtx operand);
 351
 352 /* Describes the type of an expand_operand.  Each value is associated
 353    with a create_*_operand function; see the comments above those
 354    functions for details.  */
 355 enum expand_operand_type {
 356   EXPAND_FIXED,
 357   EXPAND_OUTPUT,
 358   EXPAND_INPUT,
 359   EXPAND_CONVERT_TO,
 360   EXPAND_CONVERT_FROM,
 361   EXPAND_ADDRESS,
 362   EXPAND_INTEGER
 363 };
 364
 365 /* Information about an operand for instruction expansion.  */
 366 struct expand_operand {
 367   /* The type of operand.  */
 368   ENUM_BITFIELD (expand_operand_type) type : 8;
 369
 370   /* True if any conversion should treat VALUE as being unsigned
 371      rather than signed.  Only meaningful for certain types.  */
 372   unsigned int unsigned_p : 1;
 373
 374   /* Unused; available for future use.  */
 375   unsigned int unused : 7;
 376
 377   /* The mode passed to the convert_*_operand function.  It has a
 378      type-dependent meaning.  */
 379   ENUM_BITFIELD (machine_mode) mode : 16;
 380
 381   /* The value of the operand.  */
 382   rtx value;
 383 };
 384
 385 /* Initialize OP with the given fields.  Initialise the other fields
 386    to their default values.  */
 387
 388 static inline void
 389 create_expand_operand (struct expand_operand *op,
 390                        enum expand_operand_type type,
 391                        rtx value, enum machine_mode mode,
 392                        bool unsigned_p)
 393 {
 394   op->type = type;
 395   op->unsigned_p = unsigned_p;
 396   op->unused = 0;
 397   op->mode = mode;
 398   op->value = value;
 399 }
 400
 401 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
 402
 403 static inline void
 404 create_fixed_operand (struct expand_operand *op, rtx x)
 405 {
 406   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
 407 }
 408
 409 /* Make OP describe an output operand that must have mode MODE.
 410    X, if nonnull, is a suggestion for where the output should be stored.
 411    It is OK for VALUE to be inconsistent with MODE, although it will just
 412    be ignored in that case.  */
 413
 414 static inline void
 415 create_output_operand (struct expand_operand *op, rtx x,
 416                        enum machine_mode mode)
 417 {
 418   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 419 }
 420
 421 /* Make OP describe an input operand that must have mode MODE and
 422    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 423    VALUE be copied into a different kind of rtx before being passed
 424    as an operand.  */
 425
 426 static inline void
 427 create_input_operand (struct expand_operand *op, rtx value,
 428                       enum machine_mode mode)
 429 {
 430   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 431 }
 432
 433 /* Like create_input_operand, except that VALUE must first be converted
 434    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 435
 436 static inline void
 437 create_convert_operand_to (struct expand_operand *op, rtx value,
 438                            enum machine_mode mode, bool unsigned_p)
 439 {
 440   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 441 }
 442
 443 /* Make OP describe an input operand that should have the same value
 444    as VALUE, after any mode conversion that the backend might request.
 445    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 446    UNSIGNED_P says whether VALUE is unsigned.  */
 447
 448 static inline void
 449 create_convert_operand_from (struct expand_operand *op, rtx value,
 450                              enum machine_mode mode, bool unsigned_p)
 451 {
 452   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 453 }
 454
 455 extern void create_convert_operand_from_type (struct expand_operand *op,
 456                                               rtx value, tree type);
 457
 458 /* Make OP describe an input Pmode address operand.  VALUE is the value
 459    of the address, but it may need to be converted to Pmode first.  */
 460
 461 static inline void
 462 create_address_operand (struct expand_operand *op, rtx value)
 463 {
 464   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 465 }
 466
 467 /* Make OP describe an input operand that has value INTVAL and that has
 468    no inherent mode.  This function should only be used for operands that
 469    are always expand-time constants.  The backend may request that INTVAL
 470    be copied into a different kind of rtx, but it must specify the mode
 471    of that rtx if so.  */
 472
 473 static inline void
 474 create_integer_operand (struct expand_operand *op, HOST_WIDE_INT intval)
 475 {
 476   create_expand_operand (op, EXPAND_INTEGER, GEN_INT (intval), VOIDmode, false);
 477 }
 478
 479 extern bool valid_multiword_target_p (rtx);
 480
 481 extern bool maybe_legitimize_operands (enum insn_code icode,
 482                                        unsigned int opno, unsigned int nops,
 483                                        struct expand_operand *ops);
 484 extern rtx maybe_gen_insn (enum insn_code icode, unsigned int nops,
 485                            struct expand_operand *ops);
 486 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 487                                struct expand_operand *ops);
 488 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 489                                     struct expand_operand *ops);
 490 extern void expand_insn (enum insn_code icode, unsigned int nops,
 491                          struct expand_operand *ops);
 492 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 493                               struct expand_operand *ops);
 494
 495 extern rtx prepare_operand (enum insn_code, rtx, int, enum machine_mode,
 496                             enum machine_mode, int);
 497
 498 extern void gen_int_libfunc (optab, const char *, char, enum machine_mode);
 499 extern void gen_fp_libfunc (optab, const char *, char, enum machine_mode);
 500 extern void gen_fixed_libfunc (optab, const char *, char, enum machine_mode);
 501 extern void gen_signed_fixed_libfunc (optab, const char *, char,
 502                                       enum machine_mode);
 503 extern void gen_unsigned_fixed_libfunc (optab, const char *, char,
 504                                         enum machine_mode);
 505 extern void gen_int_fp_libfunc (optab, const char *, char, enum machine_mode);
 506 extern void gen_intv_fp_libfunc (optab, const char *, char, enum machine_mode);
 507 extern void gen_int_fp_fixed_libfunc (optab, const char *, char,
 508                                       enum machine_mode);
 509 extern void gen_int_fp_signed_fixed_libfunc (optab, const char *, char,
 510                                              enum machine_mode);
 511 extern void gen_int_fixed_libfunc (optab, const char *, char,
 512                                    enum machine_mode);
 513 extern void gen_int_signed_fixed_libfunc (optab, const char *, char,
 514                                           enum machine_mode);
 515 extern void gen_int_unsigned_fixed_libfunc (optab, const char *, char,
 516                                             enum machine_mode);
 517
 518 extern void gen_interclass_conv_libfunc (convert_optab, const char *,
 519                                          enum machine_mode, enum machine_mode);
 520 extern void gen_int_to_fp_conv_libfunc (convert_optab, const char *,
 521                                         enum machine_mode, enum machine_mode);
 522 extern void gen_ufloat_conv_libfunc (convert_optab, const char *,
 523                                      enum machine_mode, enum machine_mode);
 524 extern void gen_int_to_fp_nondecimal_conv_libfunc  (convert_optab,
 525                                                     const char *,
 526                                                     enum machine_mode,
 527                                                     enum machine_mode);
 528 extern void gen_fp_to_int_conv_libfunc (convert_optab, const char *,
 529                                         enum machine_mode, enum machine_mode);
 530 extern void gen_intraclass_conv_libfunc (convert_optab, const char *,
 531                                          enum machine_mode, enum machine_mode);
 532 extern void gen_trunc_conv_libfunc (convert_optab, const char *,
 533                                     enum machine_mode, enum machine_mode);
 534 extern void gen_extend_conv_libfunc (convert_optab, const char *,
 535                                      enum machine_mode, enum machine_mode);
 536 extern void gen_fract_conv_libfunc (convert_optab, const char *,
 537                                     enum machine_mode, enum machine_mode);
 538 extern void gen_fractuns_conv_libfunc (convert_optab, const char *,
 539                                        enum machine_mode, enum machine_mode);
 540 extern void gen_satfract_conv_libfunc (convert_optab, const char *,
 541                                        enum machine_mode, enum machine_mode);
 542 extern void gen_satfractuns_conv_libfunc (convert_optab, const char *,
 543                                           enum machine_mode,
 544                                           enum machine_mode);
 545 extern void init_tree_optimization_optabs (tree);
 546 extern bool lshift_cheap_p (bool);
 547
 548 #endif /* GCC_OPTABS_H */