gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001-2019 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 "optabs-query.h"
  24 #include "optabs-libfuncs.h"
  25 #include "vec-perm-indices.h"
  26
  27 /* Generate code for a widening multiply.  */
  28 extern rtx expand_widening_mult (machine_mode, rtx, rtx, rtx, int, optab);
  29
  30 /* Describes the type of an expand_operand.  Each value is associated
  31    with a create_*_operand function; see the comments above those
  32    functions for details.  */
  33 enum expand_operand_type {
  34   EXPAND_FIXED,
  35   EXPAND_OUTPUT,
  36   EXPAND_INPUT,
  37   EXPAND_CONVERT_TO,
  38   EXPAND_CONVERT_FROM,
  39   EXPAND_ADDRESS,
  40   EXPAND_INTEGER
  41 };
  42
  43 /* Information about an operand for instruction expansion.  */
  44 class expand_operand {
  45 public:
  46   /* The type of operand.  */
  47   ENUM_BITFIELD (expand_operand_type) type : 8;
  48
  49   /* True if any conversion should treat VALUE as being unsigned
  50      rather than signed.  Only meaningful for certain types.  */
  51   unsigned int unsigned_p : 1;
  52
  53   /* Is the target operand.  */
  54   unsigned int target : 1;
  55
  56   /* Unused; available for future use.  */
  57   unsigned int unused : 6;
  58
  59   /* The mode passed to the convert_*_operand function.  It has a
  60      type-dependent meaning.  */
  61   ENUM_BITFIELD (machine_mode) mode : 16;
  62
  63   /* The value of the operand.  */
  64   rtx value;
  65
  66   /* The value of an EXPAND_INTEGER operand.  */
  67   poly_int64 int_value;
  68 };
  69
  70 /* Initialize OP with the given fields.  Initialise the other fields
  71    to their default values.  */
  72
  73 static inline void
  74 create_expand_operand (class expand_operand *op,
  75                        enum expand_operand_type type,
  76                        rtx value, machine_mode mode,
  77                        bool unsigned_p, poly_int64 int_value = 0)
  78 {
  79   op->type = type;
  80   op->unsigned_p = unsigned_p;
  81   op->unused = 0;
  82   op->mode = mode;
  83   op->value = value;
  84   op->int_value = int_value;
  85 }
  86
  87 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
  88
  89 static inline void
  90 create_fixed_operand (class expand_operand *op, rtx x)
  91 {
  92   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
  93 }
  94
  95 /* Make OP describe an output operand that must have mode MODE.
  96    X, if nonnull, is a suggestion for where the output should be stored.
  97    It is OK for VALUE to be inconsistent with MODE, although it will just
  98    be ignored in that case.  */
  99
 100 static inline void
 101 create_output_operand (class expand_operand *op, rtx x,
 102                        machine_mode mode)
 103 {
 104   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 105 }
 106
 107 /* Make OP describe an input operand that must have mode MODE and
 108    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 109    VALUE be copied into a different kind of rtx before being passed
 110    as an operand.  */
 111
 112 static inline void
 113 create_input_operand (class expand_operand *op, rtx value,
 114                       machine_mode mode)
 115 {
 116   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 117 }
 118
 119 /* Like create_input_operand, except that VALUE must first be converted
 120    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 121
 122 static inline void
 123 create_convert_operand_to (class expand_operand *op, rtx value,
 124                            machine_mode mode, bool unsigned_p)
 125 {
 126   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 127 }
 128
 129 /* Make OP describe an input operand that should have the same value
 130    as VALUE, after any mode conversion that the backend might request.
 131    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 132    UNSIGNED_P says whether VALUE is unsigned.
 133
 134    The conversion of VALUE can include a combination of numerical
 135    conversion (as for convert_modes) and duplicating a scalar to fill
 136    a vector (if VALUE is a scalar but the operand is a vector).  */
 137
 138 static inline void
 139 create_convert_operand_from (class expand_operand *op, rtx value,
 140                              machine_mode mode, bool unsigned_p)
 141 {
 142   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 143 }
 144
 145
 146 /* Make OP describe an input Pmode address operand.  VALUE is the value
 147    of the address, but it may need to be converted to Pmode first.  */
 148
 149 static inline void
 150 create_address_operand (class expand_operand *op, rtx value)
 151 {
 152   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 153 }
 154
 155 extern void create_integer_operand (class expand_operand *, poly_int64);
 156
 157 /* Passed to expand_simple_binop and expand_binop to say which options
 158    to try to use if the requested operation can't be open-coded on the
 159    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 160    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 161    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 162    try anything else.  */
 163
 164 enum optab_methods
 165 {
 166   OPTAB_DIRECT,
 167   OPTAB_LIB,
 168   OPTAB_WIDEN,
 169   OPTAB_LIB_WIDEN,
 170   OPTAB_MUST_WIDEN
 171 };
 172
 173 extern rtx expand_widen_pattern_expr (struct separate_ops *, rtx , rtx , rtx,
 174                                       rtx, int);
 175 extern rtx expand_ternary_op (machine_mode mode, optab ternary_optab,
 176                               rtx op0, rtx op1, rtx op2, rtx target,
 177                               int unsignedp);
 178 extern rtx simplify_expand_binop (machine_mode mode, optab binoptab,
 179                                   rtx op0, rtx op1, rtx target, int unsignedp,
 180                                   enum optab_methods methods);
 181 extern bool force_expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 182                                 enum optab_methods);
 183 extern rtx expand_vector_broadcast (machine_mode, rtx);
 184
 185 /* Generate code for a simple binary or unary operation.  "Simple" in
 186    this case means "can be unambiguously described by a (mode, code)
 187    pair and mapped to a single optab."  */
 188 extern rtx expand_simple_binop (machine_mode, enum rtx_code, rtx,
 189                                 rtx, rtx, int, enum optab_methods);
 190
 191 /* Expand a binary operation given optab and rtx operands.  */
 192 extern rtx expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 193                          enum optab_methods);
 194
 195 /* Expand a binary operation with both signed and unsigned forms.  */
 196 extern rtx sign_expand_binop (machine_mode, optab, optab, rtx, rtx,
 197                               rtx, int, enum optab_methods);
 198
 199 /* Generate code to perform an operation on one operand with two results.  */
 200 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 201
 202 /* Generate code to perform an operation on two operands with two results.  */
 203 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 204
 205 /* Generate code to perform an operation on two operands with two
 206    results, using a library function.  */
 207 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 208                                          enum rtx_code);
 209 extern rtx expand_simple_unop (machine_mode, enum rtx_code, rtx, rtx,
 210                                int);
 211
 212 /* Expand a unary arithmetic operation given optab rtx operand.  */
 213 extern rtx expand_unop (machine_mode, optab, rtx, rtx, int);
 214
 215 /* Expand the absolute value operation.  */
 216 extern rtx expand_abs_nojump (machine_mode, rtx, rtx, int);
 217 extern rtx expand_abs (machine_mode, rtx, rtx, int, int);
 218
 219 /* Expand the one's complement absolute value operation.  */
 220 extern rtx expand_one_cmpl_abs_nojump (machine_mode, rtx, rtx);
 221
 222 /* Expand the copysign operation.  */
 223 extern rtx expand_copysign (rtx, rtx, rtx);
 224 /* Generate an instruction with a given INSN_CODE with an output and
 225    an input.  */
 226 extern bool maybe_emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 227 extern void emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 228
 229 /* Emit code to make a call to a constant function or a library call.  */
 230 extern void emit_libcall_block (rtx_insn *, rtx, rtx, rtx);
 231
 232 /* The various uses that a comparison can have; used by can_compare_p:
 233    jumps, conditional moves, store flag operations.  */
 234 enum can_compare_purpose
 235 {
 236   ccp_jump,
 237   ccp_cmov,
 238   ccp_store_flag
 239 };
 240
 241 /* Nonzero if a compare of mode MODE can be done straightforwardly
 242    (without splitting it into pieces).  */
 243 extern int can_compare_p (enum rtx_code, machine_mode,
 244                           enum can_compare_purpose);
 245
 246 /* Return whether the backend can emit a vector comparison for code CODE,
 247    comparing operands of mode CMP_OP_MODE and producing a result with
 248    VALUE_MODE.  */
 249 extern bool can_vcond_compare_p (enum rtx_code, machine_mode, machine_mode);
 250
 251 extern rtx prepare_operand (enum insn_code, rtx, int, machine_mode,
 252                             machine_mode, int);
 253 /* Emit a pair of rtl insns to compare two rtx's and to jump
 254    to a label if the comparison is true.  */
 255 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 256                                      machine_mode, int, rtx,
 257                                      profile_probability prob
 258                                         = profile_probability::uninitialized ());
 259
 260 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 261 extern void emit_indirect_jump (rtx);
 262
 263 #include "insn-config.h"
 264
 265 #ifndef GCC_INSN_CONFIG_H
 266 #error "insn-config.h must be included before optabs.h"
 267 #endif
 268
 269 /* Emit a conditional move operation.  */
 270 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, machine_mode,
 271                            rtx, rtx, machine_mode, int);
 272
 273 /* Emit a conditional negate or bitwise complement operation.  */
 274 rtx emit_conditional_neg_or_complement (rtx, rtx_code, machine_mode, rtx,
 275                                          rtx, rtx);
 276
 277 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, machine_mode,
 278                           rtx, rtx, machine_mode, int);
 279
 280 /* Create but don't emit one rtl instruction to perform certain operations.
 281    Modes must match; operands must meet the operation's predicates.
 282    Likewise for subtraction and for just copying.  */
 283 extern rtx_insn *gen_add2_insn (rtx, rtx);
 284 extern rtx_insn *gen_add3_insn (rtx, rtx, rtx);
 285 extern int have_add2_insn (rtx, rtx);
 286 extern rtx_insn *gen_addptr3_insn (rtx, rtx, rtx);
 287 extern int have_addptr3_insn (rtx, rtx, rtx);
 288 extern rtx_insn *gen_sub2_insn (rtx, rtx);
 289 extern rtx_insn *gen_sub3_insn (rtx, rtx, rtx);
 290 extern int have_sub2_insn (rtx, rtx);
 291
 292 /* Generate the body of an insn to extend Y (with mode MFROM)
 293    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 294 extern rtx_insn *gen_extend_insn (rtx, rtx, machine_mode, machine_mode, int);
 295
 296 /* Generate code for a FLOAT_EXPR.  */
 297 extern void expand_float (rtx, rtx, int);
 298
 299 /* Generate code for a FIX_EXPR.  */
 300 extern void expand_fix (rtx, rtx, int);
 301
 302 /* Generate code for a FIXED_CONVERT_EXPR.  */
 303 extern void expand_fixed_convert (rtx, rtx, int, int);
 304
 305 /* Generate code for float to integral conversion.  */
 306 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 307
 308 /* Report whether the machine description contains an insn which can
 309    perform the operation described by CODE and MODE.  */
 310 extern int have_insn_for (enum rtx_code, machine_mode);
 311
 312 /* Generate a conditional trap instruction.  */
 313 extern rtx_insn *gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 314
 315 /* Generate code for VEC_PERM_EXPR.  */
 316 extern rtx expand_vec_perm_var (machine_mode, rtx, rtx, rtx, rtx);
 317 extern rtx expand_vec_perm_const (machine_mode, rtx, rtx,
 318                                   const vec_perm_builder &, machine_mode, rtx);
 319
 320 /* Generate code for vector comparison.  */
 321 extern rtx expand_vec_cmp_expr (tree, tree, rtx);
 322
 323 /* Generate code for VEC_COND_EXPR.  */
 324 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 325
 326 /* Generate code for VEC_SERIES_EXPR.  */
 327 extern rtx expand_vec_series_expr (machine_mode, rtx, rtx, rtx);
 328
 329 /* Generate code for MULT_HIGHPART_EXPR.  */
 330 extern rtx expand_mult_highpart (machine_mode, rtx, rtx, rtx, bool);
 331
 332 extern rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 333 extern rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 334 extern rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 335 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 336                                             enum memmodel, enum memmodel);
 337 /* Generate memory barriers.  */
 338 extern void expand_mem_thread_fence (enum memmodel);
 339 extern void expand_mem_signal_fence (enum memmodel);
 340
 341 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 342 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 343 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 344                               bool);
 345
 346 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 347                                   rtx operand);
 348 extern bool valid_multiword_target_p (rtx);
 349 extern void create_convert_operand_from_type (class expand_operand *op,
 350                                               rtx value, tree type);
 351 extern bool maybe_legitimize_operands (enum insn_code icode,
 352                                        unsigned int opno, unsigned int nops,
 353                                        class expand_operand *ops);
 354 extern rtx_insn *maybe_gen_insn (enum insn_code icode, unsigned int nops,
 355                                  class expand_operand *ops);
 356 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 357                                class expand_operand *ops);
 358 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 359                                     class expand_operand *ops);
 360 extern void expand_insn (enum insn_code icode, unsigned int nops,
 361                          class expand_operand *ops);
 362 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 363                               class expand_operand *ops);
 364
 365 extern enum rtx_code get_rtx_code (enum tree_code tcode, bool unsignedp);
 366
 367 #endif /* GCC_OPTABS_H */