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 /* The various uses that a comparison can have; used by can_compare_p:
 166    jumps, conditional moves, store flag operations.  */
 167 enum can_compare_purpose
 168 {
 169   ccp_jump,
 170   ccp_cmov,
 171   ccp_store_flag
 172 };
 173
 174 /* Nonzero if a compare of mode MODE can be done straightforwardly
 175    (without splitting it into pieces).  */
 176 extern int can_compare_p (enum rtx_code, enum machine_mode,
 177                           enum can_compare_purpose);
 178
 179 /* Return the INSN_CODE to use for an extend operation.  */
 180 extern enum insn_code can_extend_p (enum machine_mode, enum machine_mode, int);
 181
 182 /* Generate the body of an insn to extend Y (with mode MFROM)
 183    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 184 extern rtx gen_extend_insn (rtx, rtx, enum machine_mode,
 185                             enum machine_mode, int);
 186
 187 /* Call this to reset the function entry for one optab.  */
 188 extern void set_optab_libfunc (optab, enum machine_mode, const char *);
 189 extern void set_conv_libfunc (convert_optab, enum machine_mode,
 190                               enum machine_mode, const char *);
 191
 192 /* Call this to install all of the __sync libcalls up to size MAX.  */
 193 extern void init_sync_libfuncs (int max);
 194
 195 /* Generate code for a FIXED_CONVERT_EXPR.  */
 196 extern void expand_fixed_convert (rtx, rtx, int, int);
 197
 198 /* Generate code for a FLOAT_EXPR.  */
 199 extern void expand_float (rtx, rtx, int);
 200
 201 /* Return the insn_code for a FLOAT_EXPR.  */
 202 enum insn_code can_float_p (enum machine_mode, enum machine_mode, int);
 203
 204 /* Return true if there is an inline compare and swap pattern.  */
 205 extern bool can_compare_and_swap_p (enum machine_mode, bool);
 206
 207 /* Return true if there is an inline atomic exchange pattern.  */
 208 extern bool can_atomic_exchange_p (enum machine_mode, bool);
 209
 210 /* Generate code for a compare and swap.  */
 211 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 212                                             enum memmodel, enum memmodel);
 213
 214 /* Generate memory barriers.  */
 215 extern void expand_mem_thread_fence (enum memmodel);
 216 extern void expand_mem_signal_fence (enum memmodel);
 217
 218 /* Check whether an operation represented by the code CODE is a
 219    convert operation that is supported by the target platform in
 220    vector form */
 221 bool supportable_convert_operation (enum tree_code, tree, tree, tree *,
 222                                     enum tree_code *);
 223
 224 /* Generate code for a FIX_EXPR.  */
 225 extern void expand_fix (rtx, rtx, int);
 226
 227 /* Generate code for float to integral conversion.  */
 228 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 229
 230 /* Generate code for a widening multiply.  */
 231 extern rtx expand_widening_mult (enum machine_mode, rtx, rtx, rtx, int, optab);
 232
 233 /* Return tree if target supports vector operations for COND_EXPR.  */
 234 bool expand_vec_cond_expr_p (tree, tree);
 235
 236 /* Generate code for VEC_COND_EXPR.  */
 237 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 238 /* Generate code for VEC_LSHIFT_EXPR and VEC_RSHIFT_EXPR.  */
 239 extern rtx expand_vec_shift_expr (sepops, rtx);
 240
 241 /* Return true if target supports vector operations for VEC_PERM_EXPR.  */
 242 extern bool can_vec_perm_p (enum machine_mode, bool, const unsigned char *);
 243
 244 /* Generate code for VEC_PERM_EXPR.  */
 245 extern rtx expand_vec_perm (enum machine_mode, rtx, rtx, rtx, rtx);
 246
 247 /* Return non-zero if target supports a given highpart multiplication.  */
 248 extern int can_mult_highpart_p (enum machine_mode, bool);
 249
 250 /* Generate code for MULT_HIGHPART_EXPR.  */
 251 extern rtx expand_mult_highpart (enum machine_mode, rtx, rtx, rtx, bool);
 252
 253 /* Return true if target supports vector masked load/store for mode.  */
 254 extern bool can_vec_mask_load_store_p (enum machine_mode, bool);
 255
 256 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 257    if the target does not have such an insn.  */
 258
 259 static inline enum insn_code
 260 optab_handler (optab op, enum machine_mode mode)
 261 {
 262   unsigned scode = (op << 16) | mode;
 263   gcc_assert (op > LAST_CONV_OPTAB);
 264   return raw_optab_handler (scode);
 265 }
 266
 267 /* Return the insn used to perform conversion OP from mode FROM_MODE
 268    to mode TO_MODE; return CODE_FOR_nothing if the target does not have
 269    such an insn.  */
 270
 271 static inline enum insn_code
 272 convert_optab_handler (convert_optab op, enum machine_mode to_mode,
 273                        enum machine_mode from_mode)
 274 {
 275   unsigned scode = (op << 16) | (from_mode << 8) | to_mode;
 276   gcc_assert (op > unknown_optab && op <= LAST_CONV_OPTAB);
 277   return raw_optab_handler (scode);
 278 }
 279
 280 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 281    if the target does not have such an insn.  */
 282
 283 static inline enum insn_code
 284 direct_optab_handler (direct_optab op, enum machine_mode mode)
 285 {
 286   return optab_handler (op, mode);
 287 }
 288
 289 /* Return true if UNOPTAB is for a trapping-on-overflow operation.  */
 290
 291 static inline bool
 292 trapv_unoptab_p (optab unoptab)
 293 {
 294   return (unoptab == negv_optab
 295           || unoptab == absv_optab);
 296 }
 297
 298 /* Return true if BINOPTAB is for a trapping-on-overflow operation.  */
 299
 300 static inline bool
 301 trapv_binoptab_p (optab binoptab)
 302 {
 303   return (binoptab == addv_optab
 304           || binoptab == subv_optab
 305           || binoptab == smulv_optab);
 306 }
 307
 308 extern rtx optab_libfunc (optab optab, enum machine_mode mode);
 309 extern rtx convert_optab_libfunc (convert_optab optab, enum machine_mode mode1,
 310                                   enum machine_mode mode2);
 311
 312 /* Describes an instruction that inserts or extracts a bitfield.  */
 313 struct extraction_insn
 314 {
 315   /* The code of the instruction.  */
 316   enum insn_code icode;
 317
 318   /* The mode that the structure operand should have.  This is byte_mode
 319      when using the legacy insv, extv and extzv patterns to access memory.  */
 320   enum machine_mode struct_mode;
 321
 322   /* The mode of the field to be inserted or extracted, and by extension
 323      the mode of the insertion or extraction itself.  */
 324   enum machine_mode field_mode;
 325
 326   /* The mode of the field's bit position.  This is only important
 327      when the position is variable rather than constant.  */
 328   enum machine_mode pos_mode;
 329 };
 330
 331 /* Enumerates the possible extraction_insn operations.  */
 332 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 333
 334 extern bool get_best_reg_extraction_insn (extraction_insn *,
 335                                           enum extraction_pattern,
 336                                           unsigned HOST_WIDE_INT,
 337                                           enum machine_mode);
 338
 339 extern bool get_best_mem_extraction_insn (extraction_insn *,
 340                                           enum extraction_pattern,
 341                                           HOST_WIDE_INT, HOST_WIDE_INT,
 342                                           enum machine_mode);
 343
 344 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 345                                   rtx operand);
 346
 347 /* Describes the type of an expand_operand.  Each value is associated
 348    with a create_*_operand function; see the comments above those
 349    functions for details.  */
 350 enum expand_operand_type {
 351   EXPAND_FIXED,
 352   EXPAND_OUTPUT,
 353   EXPAND_INPUT,
 354   EXPAND_CONVERT_TO,
 355   EXPAND_CONVERT_FROM,
 356   EXPAND_ADDRESS,
 357   EXPAND_INTEGER
 358 };
 359
 360 /* Information about an operand for instruction expansion.  */
 361 struct expand_operand {
 362   /* The type of operand.  */
 363   ENUM_BITFIELD (expand_operand_type) type : 8;
 364
 365   /* True if any conversion should treat VALUE as being unsigned
 366      rather than signed.  Only meaningful for certain types.  */
 367   unsigned int unsigned_p : 1;
 368
 369   /* Unused; available for future use.  */
 370   unsigned int unused : 7;
 371
 372   /* The mode passed to the convert_*_operand function.  It has a
 373      type-dependent meaning.  */
 374   ENUM_BITFIELD (machine_mode) mode : 16;
 375
 376   /* The value of the operand.  */
 377   rtx value;
 378 };
 379
 380 /* Initialize OP with the given fields.  Initialise the other fields
 381    to their default values.  */
 382
 383 static inline void
 384 create_expand_operand (struct expand_operand *op,
 385                        enum expand_operand_type type,
 386                        rtx value, enum machine_mode mode,
 387                        bool unsigned_p)
 388 {
 389   op->type = type;
 390   op->unsigned_p = unsigned_p;
 391   op->unused = 0;
 392   op->mode = mode;
 393   op->value = value;
 394 }
 395
 396 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
 397
 398 static inline void
 399 create_fixed_operand (struct expand_operand *op, rtx x)
 400 {
 401   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
 402 }
 403
 404 /* Make OP describe an output operand that must have mode MODE.
 405    X, if nonnull, is a suggestion for where the output should be stored.
 406    It is OK for VALUE to be inconsistent with MODE, although it will just
 407    be ignored in that case.  */
 408
 409 static inline void
 410 create_output_operand (struct expand_operand *op, rtx x,
 411                        enum machine_mode mode)
 412 {
 413   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 414 }
 415
 416 /* Make OP describe an input operand that must have mode MODE and
 417    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 418    VALUE be copied into a different kind of rtx before being passed
 419    as an operand.  */
 420
 421 static inline void
 422 create_input_operand (struct expand_operand *op, rtx value,
 423                       enum machine_mode mode)
 424 {
 425   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 426 }
 427
 428 /* Like create_input_operand, except that VALUE must first be converted
 429    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 430
 431 static inline void
 432 create_convert_operand_to (struct expand_operand *op, rtx value,
 433                            enum machine_mode mode, bool unsigned_p)
 434 {
 435   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 436 }
 437
 438 /* Make OP describe an input operand that should have the same value
 439    as VALUE, after any mode conversion that the backend might request.
 440    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 441    UNSIGNED_P says whether VALUE is unsigned.  */
 442
 443 static inline void
 444 create_convert_operand_from (struct expand_operand *op, rtx value,
 445                              enum machine_mode mode, bool unsigned_p)
 446 {
 447   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 448 }
 449
 450 extern void create_convert_operand_from_type (struct expand_operand *op,
 451                                               rtx value, tree type);
 452
 453 /* Make OP describe an input Pmode address operand.  VALUE is the value
 454    of the address, but it may need to be converted to Pmode first.  */
 455
 456 static inline void
 457 create_address_operand (struct expand_operand *op, rtx value)
 458 {
 459   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 460 }
 461
 462 /* Make OP describe an input operand that has value INTVAL and that has
 463    no inherent mode.  This function should only be used for operands that
 464    are always expand-time constants.  The backend may request that INTVAL
 465    be copied into a different kind of rtx, but it must specify the mode
 466    of that rtx if so.  */
 467
 468 static inline void
 469 create_integer_operand (struct expand_operand *op, HOST_WIDE_INT intval)
 470 {
 471   create_expand_operand (op, EXPAND_INTEGER, GEN_INT (intval), VOIDmode, false);
 472 }
 473
 474 extern bool valid_multiword_target_p (rtx);
 475
 476 extern bool maybe_legitimize_operands (enum insn_code icode,
 477                                        unsigned int opno, unsigned int nops,
 478                                        struct expand_operand *ops);
 479 extern rtx maybe_gen_insn (enum insn_code icode, unsigned int nops,
 480                            struct expand_operand *ops);
 481 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 482                                struct expand_operand *ops);
 483 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 484                                     struct expand_operand *ops);
 485 extern void expand_insn (enum insn_code icode, unsigned int nops,
 486                          struct expand_operand *ops);
 487 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 488                               struct expand_operand *ops);
 489
 490 extern rtx prepare_operand (enum insn_code, rtx, int, enum machine_mode,
 491                             enum machine_mode, int);
 492
 493 extern void gen_int_libfunc (optab, const char *, char, enum machine_mode);
 494 extern void gen_fp_libfunc (optab, const char *, char, enum machine_mode);
 495 extern void gen_fixed_libfunc (optab, const char *, char, enum machine_mode);
 496 extern void gen_signed_fixed_libfunc (optab, const char *, char,
 497                                       enum machine_mode);
 498 extern void gen_unsigned_fixed_libfunc (optab, const char *, char,
 499                                         enum machine_mode);
 500 extern void gen_int_fp_libfunc (optab, const char *, char, enum machine_mode);
 501 extern void gen_intv_fp_libfunc (optab, const char *, char, enum machine_mode);
 502 extern void gen_int_fp_fixed_libfunc (optab, const char *, char,
 503                                       enum machine_mode);
 504 extern void gen_int_fp_signed_fixed_libfunc (optab, const char *, char,
 505                                              enum machine_mode);
 506 extern void gen_int_fixed_libfunc (optab, const char *, char,
 507                                    enum machine_mode);
 508 extern void gen_int_signed_fixed_libfunc (optab, const char *, char,
 509                                           enum machine_mode);
 510 extern void gen_int_unsigned_fixed_libfunc (optab, const char *, char,
 511                                             enum machine_mode);
 512
 513 extern void gen_interclass_conv_libfunc (convert_optab, const char *,
 514                                          enum machine_mode, enum machine_mode);
 515 extern void gen_int_to_fp_conv_libfunc (convert_optab, const char *,
 516                                         enum machine_mode, enum machine_mode);
 517 extern void gen_ufloat_conv_libfunc (convert_optab, const char *,
 518                                      enum machine_mode, enum machine_mode);
 519 extern void gen_int_to_fp_nondecimal_conv_libfunc  (convert_optab,
 520                                                     const char *,
 521                                                     enum machine_mode,
 522                                                     enum machine_mode);
 523 extern void gen_fp_to_int_conv_libfunc (convert_optab, const char *,
 524                                         enum machine_mode, enum machine_mode);
 525 extern void gen_intraclass_conv_libfunc (convert_optab, const char *,
 526                                          enum machine_mode, enum machine_mode);
 527 extern void gen_trunc_conv_libfunc (convert_optab, const char *,
 528                                     enum machine_mode, enum machine_mode);
 529 extern void gen_extend_conv_libfunc (convert_optab, const char *,
 530                                      enum machine_mode, enum machine_mode);
 531 extern void gen_fract_conv_libfunc (convert_optab, const char *,
 532                                     enum machine_mode, enum machine_mode);
 533 extern void gen_fractuns_conv_libfunc (convert_optab, const char *,
 534                                        enum machine_mode, enum machine_mode);
 535 extern void gen_satfract_conv_libfunc (convert_optab, const char *,
 536                                        enum machine_mode, enum machine_mode);
 537 extern void gen_satfractuns_conv_libfunc (convert_optab, const char *,
 538                                           enum machine_mode,
 539                                           enum machine_mode);
 540 extern void init_tree_optimization_optabs (tree);
 541
 542 #endif /* GCC_OPTABS_H */