gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   3    2010, 2012  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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_OPTABS_H
  22 #define GCC_OPTABS_H
  23
  24 #include "insn-codes.h"
  25 #include "insn-opinit.h"
  26
  27 typedef enum optab_tag optab;
  28 typedef enum optab_tag convert_optab;
  29 typedef enum optab_tag direct_optab;
  30
  31 struct optab_libcall_d
  32 {
  33   char libcall_suffix;
  34   const char *libcall_basename;
  35   void (*libcall_gen) (optab, const char *name,
  36                        char suffix, enum machine_mode);
  37 };
  38
  39 struct convert_optab_libcall_d
  40 {
  41   const char *libcall_basename;
  42   void (*libcall_gen) (convert_optab, const char *name,
  43                        enum machine_mode, enum machine_mode);
  44 };
  45
  46 /* Given an enum insn_code, access the function to construct
  47    the body of that kind of insn.  */
  48 #define GEN_FCN(CODE) (insn_data[CODE].genfun)
  49
  50 /* Contains the optab used for each rtx code, and vice-versa.  */
  51 extern const optab code_to_optab_[NUM_RTX_CODE];
  52 extern const enum rtx_code optab_to_code_[NUM_OPTABS];
  53
  54 static inline optab
  55 code_to_optab (enum rtx_code code)
  56 {
  57   return code_to_optab_[code];
  58 }
  59
  60 static inline enum rtx_code
  61 optab_to_code (optab op)
  62 {
  63   return optab_to_code_[op];
  64 }
  65
  66 extern const struct convert_optab_libcall_d convlib_def[NUM_CONVLIB_OPTABS];
  67 extern const struct optab_libcall_d normlib_def[NUM_NORMLIB_OPTABS];
  68
  69 /* Returns the active icode for the given (encoded) optab.  */
  70 extern enum insn_code raw_optab_handler (unsigned);
  71 extern bool swap_optab_enable (optab, enum machine_mode, bool);
  72
  73 /* Target-dependent globals.  */
  74 struct target_optabs {
  75   /* Patterns that are used by optabs that are enabled for this target.  */
  76   bool pat_enable[NUM_OPTAB_PATTERNS];
  77 };
  78
  79 extern struct target_optabs default_target_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
 148 /* An extra flag to control optab_for_tree_code's behavior.  This is needed to
 149    distinguish between machines with a vector shift that takes a scalar for the
 150    shift amount vs. machines that take a vector for the shift amount.  */
 151 enum optab_subtype
 152 {
 153   optab_default,
 154   optab_scalar,
 155   optab_vector
 156 };
 157
 158 /* Return the optab used for computing the given operation on the type given by
 159    the second argument.  The third argument distinguishes between the types of
 160    vector shifts and rotates */
 161 extern optab optab_for_tree_code (enum tree_code, const_tree, enum optab_subtype);
 162
 163 /* The various uses that a comparison can have; used by can_compare_p:
 164    jumps, conditional moves, store flag operations.  */
 165 enum can_compare_purpose
 166 {
 167   ccp_jump,
 168   ccp_cmov,
 169   ccp_store_flag
 170 };
 171
 172 /* Nonzero if a compare of mode MODE can be done straightforwardly
 173    (without splitting it into pieces).  */
 174 extern int can_compare_p (enum rtx_code, enum machine_mode,
 175                           enum can_compare_purpose);
 176
 177 /* Return the INSN_CODE to use for an extend operation.  */
 178 extern enum insn_code can_extend_p (enum machine_mode, enum machine_mode, int);
 179
 180 /* Generate the body of an insn to extend Y (with mode MFROM)
 181    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 182 extern rtx gen_extend_insn (rtx, rtx, enum machine_mode,
 183                             enum machine_mode, int);
 184
 185 /* Call this to reset the function entry for one optab.  */
 186 extern void set_optab_libfunc (optab, enum machine_mode, const char *);
 187 extern void set_conv_libfunc (convert_optab, enum machine_mode,
 188                               enum machine_mode, const char *);
 189
 190 /* Call this to install all of the __sync libcalls up to size MAX.  */
 191 extern void init_sync_libfuncs (int max);
 192
 193 /* Generate code for a FIXED_CONVERT_EXPR.  */
 194 extern void expand_fixed_convert (rtx, rtx, int, int);
 195
 196 /* Generate code for a FLOAT_EXPR.  */
 197 extern void expand_float (rtx, rtx, int);
 198
 199 /* Return the insn_code for a FLOAT_EXPR.  */
 200 enum insn_code can_float_p (enum machine_mode, enum machine_mode, int);
 201
 202 /* Return true if there is an inline compare and swap pattern.  */
 203 extern bool can_compare_and_swap_p (enum machine_mode, bool);
 204
 205 /* Return true if there is an inline atomic exchange pattern.  */
 206 extern bool can_atomic_exchange_p (enum machine_mode, bool);
 207
 208 /* Generate code for a compare and swap.  */
 209 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 210                                             enum memmodel, enum memmodel);
 211
 212 /* Generate memory barriers.  */
 213 extern void expand_mem_thread_fence (enum memmodel);
 214 extern void expand_mem_signal_fence (enum memmodel);
 215
 216 /* Check whether an operation represented by the code CODE is a
 217    convert operation that is supported by the target platform in
 218    vector form */
 219 bool supportable_convert_operation (enum tree_code, tree, tree, tree *,
 220                                     enum tree_code *);
 221
 222 /* Generate code for a FIX_EXPR.  */
 223 extern void expand_fix (rtx, rtx, int);
 224
 225 /* Generate code for float to integral conversion.  */
 226 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 227
 228 /* Generate code for a widening multiply.  */
 229 extern rtx expand_widening_mult (enum machine_mode, rtx, rtx, rtx, int, optab);
 230
 231 /* Return tree if target supports vector operations for COND_EXPR.  */
 232 bool expand_vec_cond_expr_p (tree, tree);
 233
 234 /* Generate code for VEC_COND_EXPR.  */
 235 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 236 /* Generate code for VEC_LSHIFT_EXPR and VEC_RSHIFT_EXPR.  */
 237 extern rtx expand_vec_shift_expr (sepops, rtx);
 238
 239 /* Return tree if target supports vector operations for VEC_PERM_EXPR.  */
 240 extern bool can_vec_perm_p (enum machine_mode, bool, const unsigned char *);
 241
 242 /* Generate code for VEC_PERM_EXPR.  */
 243 extern rtx expand_vec_perm (enum machine_mode, rtx, rtx, rtx, rtx);
 244
 245 /* Return non-zero if target supports a given highpart multiplication.  */
 246 extern int can_mult_highpart_p (enum machine_mode, bool);
 247
 248 /* Generate code for MULT_HIGHPART_EXPR.  */
 249 extern rtx expand_mult_highpart (enum machine_mode, rtx, rtx, rtx, bool);
 250
 251 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 252    if the target does not have such an insn.  */
 253
 254 static inline enum insn_code
 255 optab_handler (optab op, enum machine_mode mode)
 256 {
 257   unsigned scode = (op << 16) | mode;
 258   gcc_assert (op > LAST_CONV_OPTAB);
 259   return raw_optab_handler (scode);
 260 }
 261
 262 /* Return the insn used to perform conversion OP from mode FROM_MODE
 263    to mode TO_MODE; return CODE_FOR_nothing if the target does not have
 264    such an insn.  */
 265
 266 static inline enum insn_code
 267 convert_optab_handler (convert_optab op, enum machine_mode to_mode,
 268                        enum machine_mode from_mode)
 269 {
 270   unsigned scode = (op << 16) | (from_mode << 8) | to_mode;
 271   gcc_assert (op > unknown_optab && op <= LAST_CONV_OPTAB);
 272   return raw_optab_handler (scode);
 273 }
 274
 275 /* Like optab_handler, but for widening_operations that have a
 276    TO_MODE and a FROM_MODE.  */
 277
 278 static inline enum insn_code
 279 widening_optab_handler (optab op, enum machine_mode to_mode,
 280                         enum machine_mode from_mode)
 281 {
 282   unsigned scode = (op << 16) | to_mode;
 283   if (to_mode != from_mode && from_mode != VOIDmode)
 284     {
 285       /* ??? Why does find_widening_optab_handler_and_mode attempt to
 286          widen things that can't be widened?  E.g. add_optab... */
 287       if (op > LAST_CONV_OPTAB)
 288         return CODE_FOR_nothing;
 289       scode |= from_mode << 8;
 290     }
 291   return raw_optab_handler (scode);
 292 }
 293
 294 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
 295    if the target does not have such an insn.  */
 296
 297 static inline enum insn_code
 298 direct_optab_handler (direct_optab op, enum machine_mode mode)
 299 {
 300   return optab_handler (op, mode);
 301 }
 302
 303 /* Return true if UNOPTAB is for a trapping-on-overflow operation.  */
 304
 305 static inline bool
 306 trapv_unoptab_p (optab unoptab)
 307 {
 308   return (unoptab == negv_optab
 309           || unoptab == absv_optab);
 310 }
 311
 312 /* Return true if BINOPTAB is for a trapping-on-overflow operation.  */
 313
 314 static inline bool
 315 trapv_binoptab_p (optab binoptab)
 316 {
 317   return (binoptab == addv_optab
 318           || binoptab == subv_optab
 319           || binoptab == smulv_optab);
 320 }
 321
 322 extern rtx optab_libfunc (optab optab, enum machine_mode mode);
 323 extern rtx convert_optab_libfunc (convert_optab optab, enum machine_mode mode1,
 324                                   enum machine_mode mode2);
 325
 326 /* Describes an instruction that inserts or extracts a bitfield.  */
 327 struct extraction_insn
 328 {
 329   /* The code of the instruction.  */
 330   enum insn_code icode;
 331
 332   /* The mode that the structure operand should have.  This is byte_mode
 333      when using the legacy insv, extv and extzv patterns to access memory.  */
 334   enum machine_mode struct_mode;
 335
 336   /* The mode of the field to be inserted or extracted, and by extension
 337      the mode of the insertion or extraction itself.  */
 338   enum machine_mode field_mode;
 339
 340   /* The mode of the field's bit position.  This is only important
 341      when the position is variable rather than constant.  */
 342   enum machine_mode pos_mode;
 343 };
 344
 345 /* Enumerates the possible extraction_insn operations.  */
 346 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 347
 348 extern bool get_best_reg_extraction_insn (extraction_insn *,
 349                                           enum extraction_pattern,
 350                                           unsigned HOST_WIDE_INT,
 351                                           enum machine_mode);
 352
 353 extern bool get_best_mem_extraction_insn (extraction_insn *,
 354                                           enum extraction_pattern,
 355                                           HOST_WIDE_INT, HOST_WIDE_INT,
 356                                           enum machine_mode);
 357
 358 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 359                                   rtx operand);
 360
 361 /* Describes the type of an expand_operand.  Each value is associated
 362    with a create_*_operand function; see the comments above those
 363    functions for details.  */
 364 enum expand_operand_type {
 365   EXPAND_FIXED,
 366   EXPAND_OUTPUT,
 367   EXPAND_INPUT,
 368   EXPAND_CONVERT_TO,
 369   EXPAND_CONVERT_FROM,
 370   EXPAND_ADDRESS,
 371   EXPAND_INTEGER
 372 };
 373
 374 /* Information about an operand for instruction expansion.  */
 375 struct expand_operand {
 376   /* The type of operand.  */
 377   ENUM_BITFIELD (expand_operand_type) type : 8;
 378
 379   /* True if any conversion should treat VALUE as being unsigned
 380      rather than signed.  Only meaningful for certain types.  */
 381   unsigned int unsigned_p : 1;
 382
 383   /* Unused; available for future use.  */
 384   unsigned int unused : 7;
 385
 386   /* The mode passed to the convert_*_operand function.  It has a
 387      type-dependent meaning.  */
 388   ENUM_BITFIELD (machine_mode) mode : 16;
 389
 390   /* The value of the operand.  */
 391   rtx value;
 392 };
 393
 394 /* Initialize OP with the given fields.  Initialise the other fields
 395    to their default values.  */
 396
 397 static inline void
 398 create_expand_operand (struct expand_operand *op,
 399                        enum expand_operand_type type,
 400                        rtx value, enum machine_mode mode,
 401                        bool unsigned_p)
 402 {
 403   op->type = type;
 404   op->unsigned_p = unsigned_p;
 405   op->unused = 0;
 406   op->mode = mode;
 407   op->value = value;
 408 }
 409
 410 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
 411
 412 static inline void
 413 create_fixed_operand (struct expand_operand *op, rtx x)
 414 {
 415   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
 416 }
 417
 418 /* Make OP describe an output operand that must have mode MODE.
 419    X, if nonnull, is a suggestion for where the output should be stored.
 420    It is OK for VALUE to be inconsistent with MODE, although it will just
 421    be ignored in that case.  */
 422
 423 static inline void
 424 create_output_operand (struct expand_operand *op, rtx x,
 425                        enum machine_mode mode)
 426 {
 427   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 428 }
 429
 430 /* Make OP describe an input operand that must have mode MODE and
 431    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 432    VALUE be copied into a different kind of rtx before being passed
 433    as an operand.  */
 434
 435 static inline void
 436 create_input_operand (struct expand_operand *op, rtx value,
 437                       enum machine_mode mode)
 438 {
 439   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 440 }
 441
 442 /* Like create_input_operand, except that VALUE must first be converted
 443    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 444
 445 static inline void
 446 create_convert_operand_to (struct expand_operand *op, rtx value,
 447                            enum machine_mode mode, bool unsigned_p)
 448 {
 449   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 450 }
 451
 452 /* Make OP describe an input operand that should have the same value
 453    as VALUE, after any mode conversion that the backend might request.
 454    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 455    UNSIGNED_P says whether VALUE is unsigned.  */
 456
 457 static inline void
 458 create_convert_operand_from (struct expand_operand *op, rtx value,
 459                              enum machine_mode mode, bool unsigned_p)
 460 {
 461   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 462 }
 463
 464 extern void create_convert_operand_from_type (struct expand_operand *op,
 465                                               rtx value, tree type);
 466
 467 /* Make OP describe an input Pmode address operand.  VALUE is the value
 468    of the address, but it may need to be converted to Pmode first.  */
 469
 470 static inline void
 471 create_address_operand (struct expand_operand *op, rtx value)
 472 {
 473   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 474 }
 475
 476 /* Make OP describe an input operand that has value INTVAL and that has
 477    no inherent mode.  This function should only be used for operands that
 478    are always expand-time constants.  The backend may request that INTVAL
 479    be copied into a different kind of rtx, but it must specify the mode
 480    of that rtx if so.  */
 481
 482 static inline void
 483 create_integer_operand (struct expand_operand *op, HOST_WIDE_INT intval)
 484 {
 485   create_expand_operand (op, EXPAND_INTEGER, GEN_INT (intval), VOIDmode, false);
 486 }
 487
 488 extern bool valid_multiword_target_p (rtx);
 489
 490 extern bool maybe_legitimize_operands (enum insn_code icode,
 491                                        unsigned int opno, unsigned int nops,
 492                                        struct expand_operand *ops);
 493 extern rtx maybe_gen_insn (enum insn_code icode, unsigned int nops,
 494                            struct expand_operand *ops);
 495 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 496                                struct expand_operand *ops);
 497 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 498                                     struct expand_operand *ops);
 499 extern void expand_insn (enum insn_code icode, unsigned int nops,
 500                          struct expand_operand *ops);
 501 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 502                               struct expand_operand *ops);
 503
 504 extern rtx prepare_operand (enum insn_code, rtx, int, enum machine_mode,
 505                             enum machine_mode, int);
 506
 507 extern void gen_int_libfunc (optab, const char *, char, enum machine_mode);
 508 extern void gen_fp_libfunc (optab, const char *, char, enum machine_mode);
 509 extern void gen_fixed_libfunc (optab, const char *, char, enum machine_mode);
 510 extern void gen_signed_fixed_libfunc (optab, const char *, char,
 511                                       enum machine_mode);
 512 extern void gen_unsigned_fixed_libfunc (optab, const char *, char,
 513                                         enum machine_mode);
 514 extern void gen_int_fp_libfunc (optab, const char *, char, enum machine_mode);
 515 extern void gen_intv_fp_libfunc (optab, const char *, char, enum machine_mode);
 516 extern void gen_int_fp_fixed_libfunc (optab, const char *, char,
 517                                       enum machine_mode);
 518 extern void gen_int_fp_signed_fixed_libfunc (optab, const char *, char,
 519                                              enum machine_mode);
 520 extern void gen_int_fixed_libfunc (optab, const char *, char,
 521                                    enum machine_mode);
 522 extern void gen_int_signed_fixed_libfunc (optab, const char *, char,
 523                                           enum machine_mode);
 524 extern void gen_int_unsigned_fixed_libfunc (optab, const char *, char,
 525                                             enum machine_mode);
 526
 527 extern void gen_interclass_conv_libfunc (convert_optab, const char *,
 528                                          enum machine_mode, enum machine_mode);
 529 extern void gen_int_to_fp_conv_libfunc (convert_optab, const char *,
 530                                         enum machine_mode, enum machine_mode);
 531 extern void gen_ufloat_conv_libfunc (convert_optab, const char *,
 532                                      enum machine_mode, enum machine_mode);
 533 extern void gen_int_to_fp_nondecimal_conv_libfunc  (convert_optab,
 534                                                     const char *,
 535                                                     enum machine_mode,
 536                                                     enum machine_mode);
 537 extern void gen_fp_to_int_conv_libfunc (convert_optab, const char *,
 538                                         enum machine_mode, enum machine_mode);
 539 extern void gen_intraclass_conv_libfunc (convert_optab, const char *,
 540                                          enum machine_mode, enum machine_mode);
 541 extern void gen_trunc_conv_libfunc (convert_optab, const char *,
 542                                     enum machine_mode, enum machine_mode);
 543 extern void gen_extend_conv_libfunc (convert_optab, const char *,
 544                                      enum machine_mode, enum machine_mode);
 545 extern void gen_fract_conv_libfunc (convert_optab, const char *,
 546                                     enum machine_mode, enum machine_mode);
 547 extern void gen_fractuns_conv_libfunc (convert_optab, const char *,
 548                                        enum machine_mode, enum machine_mode);
 549 extern void gen_satfract_conv_libfunc (convert_optab, const char *,
 550                                        enum machine_mode, enum machine_mode);
 551 extern void gen_satfractuns_conv_libfunc (convert_optab, const char *,
 552                                           enum machine_mode,
 553                                           enum machine_mode);
 554
 555 #endif /* GCC_OPTABS_H */