gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001-2018 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 struct expand_operand {
  45   /* The type of operand.  */
  46   ENUM_BITFIELD (expand_operand_type) type : 8;
  47
  48   /* True if any conversion should treat VALUE as being unsigned
  49      rather than signed.  Only meaningful for certain types.  */
  50   unsigned int unsigned_p : 1;
  51
  52   /* Is the target operand.  */
  53   unsigned int target : 1;
  54
  55   /* Unused; available for future use.  */
  56   unsigned int unused : 6;
  57
  58   /* The mode passed to the convert_*_operand function.  It has a
  59      type-dependent meaning.  */
  60   ENUM_BITFIELD (machine_mode) mode : 16;
  61
  62   /* The value of the operand.  */
  63   rtx value;
  64
  65   /* The value of an EXPAND_INTEGER operand.  */
  66   poly_int64 int_value;
  67 };
  68
  69 /* Initialize OP with the given fields.  Initialise the other fields
  70    to their default values.  */
  71
  72 static inline void
  73 create_expand_operand (struct expand_operand *op,
  74                        enum expand_operand_type type,
  75                        rtx value, machine_mode mode,
  76                        bool unsigned_p, poly_int64 int_value = 0)
  77 {
  78   op->type = type;
  79   op->unsigned_p = unsigned_p;
  80   op->unused = 0;
  81   op->mode = mode;
  82   op->value = value;
  83   op->int_value = int_value;
  84 }
  85
  86 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
  87
  88 static inline void
  89 create_fixed_operand (struct expand_operand *op, rtx x)
  90 {
  91   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
  92 }
  93
  94 /* Make OP describe an output operand that must have mode MODE.
  95    X, if nonnull, is a suggestion for where the output should be stored.
  96    It is OK for VALUE to be inconsistent with MODE, although it will just
  97    be ignored in that case.  */
  98
  99 static inline void
 100 create_output_operand (struct expand_operand *op, rtx x,
 101                        machine_mode mode)
 102 {
 103   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 104 }
 105
 106 /* Make OP describe an input operand that must have mode MODE and
 107    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 108    VALUE be copied into a different kind of rtx before being passed
 109    as an operand.  */
 110
 111 static inline void
 112 create_input_operand (struct expand_operand *op, rtx value,
 113                       machine_mode mode)
 114 {
 115   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 116 }
 117
 118 /* Like create_input_operand, except that VALUE must first be converted
 119    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 120
 121 static inline void
 122 create_convert_operand_to (struct expand_operand *op, rtx value,
 123                            machine_mode mode, bool unsigned_p)
 124 {
 125   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 126 }
 127
 128 /* Make OP describe an input operand that should have the same value
 129    as VALUE, after any mode conversion that the backend might request.
 130    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 131    UNSIGNED_P says whether VALUE is unsigned.  */
 132
 133 static inline void
 134 create_convert_operand_from (struct expand_operand *op, rtx value,
 135                              machine_mode mode, bool unsigned_p)
 136 {
 137   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 138 }
 139
 140
 141 /* Make OP describe an input Pmode address operand.  VALUE is the value
 142    of the address, but it may need to be converted to Pmode first.  */
 143
 144 static inline void
 145 create_address_operand (struct expand_operand *op, rtx value)
 146 {
 147   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 148 }
 149
 150 extern void create_integer_operand (struct expand_operand *, poly_int64);
 151
 152 /* Passed to expand_simple_binop and expand_binop to say which options
 153    to try to use if the requested operation can't be open-coded on the
 154    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 155    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 156    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 157    try anything else.  */
 158
 159 enum optab_methods
 160 {
 161   OPTAB_DIRECT,
 162   OPTAB_LIB,
 163   OPTAB_WIDEN,
 164   OPTAB_LIB_WIDEN,
 165   OPTAB_MUST_WIDEN
 166 };
 167
 168 extern rtx expand_widen_pattern_expr (struct separate_ops *, rtx , rtx , rtx,
 169                                       rtx, int);
 170 extern rtx expand_ternary_op (machine_mode mode, optab ternary_optab,
 171                               rtx op0, rtx op1, rtx op2, rtx target,
 172                               int unsignedp);
 173 extern rtx simplify_expand_binop (machine_mode mode, optab binoptab,
 174                                   rtx op0, rtx op1, rtx target, int unsignedp,
 175                                   enum optab_methods methods);
 176 extern bool force_expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 177                                 enum optab_methods);
 178 extern rtx expand_vector_broadcast (machine_mode, rtx);
 179
 180 /* Generate code for a simple binary or unary operation.  "Simple" in
 181    this case means "can be unambiguously described by a (mode, code)
 182    pair and mapped to a single optab."  */
 183 extern rtx expand_simple_binop (machine_mode, enum rtx_code, rtx,
 184                                 rtx, rtx, int, enum optab_methods);
 185
 186 /* Expand a binary operation given optab and rtx operands.  */
 187 extern rtx expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 188                          enum optab_methods);
 189
 190 /* Expand a binary operation with both signed and unsigned forms.  */
 191 extern rtx sign_expand_binop (machine_mode, optab, optab, rtx, rtx,
 192                               rtx, int, enum optab_methods);
 193
 194 /* Generate code to perform an operation on one operand with two results.  */
 195 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 196
 197 /* Generate code to perform an operation on two operands with two results.  */
 198 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 199
 200 /* Generate code to perform an operation on two operands with two
 201    results, using a library function.  */
 202 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 203                                          enum rtx_code);
 204 extern rtx expand_simple_unop (machine_mode, enum rtx_code, rtx, rtx,
 205                                int);
 206
 207 /* Expand a unary arithmetic operation given optab rtx operand.  */
 208 extern rtx expand_unop (machine_mode, optab, rtx, rtx, int);
 209
 210 /* Expand the absolute value operation.  */
 211 extern rtx expand_abs_nojump (machine_mode, rtx, rtx, int);
 212 extern rtx expand_abs (machine_mode, rtx, rtx, int, int);
 213
 214 /* Expand the one's complement absolute value operation.  */
 215 extern rtx expand_one_cmpl_abs_nojump (machine_mode, rtx, rtx);
 216
 217 /* Expand the copysign operation.  */
 218 extern rtx expand_copysign (rtx, rtx, rtx);
 219 /* Generate an instruction with a given INSN_CODE with an output and
 220    an input.  */
 221 extern bool maybe_emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 222 extern void emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 223
 224 /* Emit code to make a call to a constant function or a library call.  */
 225 extern void emit_libcall_block (rtx_insn *, rtx, rtx, rtx);
 226
 227 /* The various uses that a comparison can have; used by can_compare_p:
 228    jumps, conditional moves, store flag operations.  */
 229 enum can_compare_purpose
 230 {
 231   ccp_jump,
 232   ccp_cmov,
 233   ccp_store_flag
 234 };
 235
 236 /* Nonzero if a compare of mode MODE can be done straightforwardly
 237    (without splitting it into pieces).  */
 238 extern int can_compare_p (enum rtx_code, machine_mode,
 239                           enum can_compare_purpose);
 240 extern rtx prepare_operand (enum insn_code, rtx, int, machine_mode,
 241                             machine_mode, int);
 242 /* Emit a pair of rtl insns to compare two rtx's and to jump
 243    to a label if the comparison is true.  */
 244 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 245                                      machine_mode, int, rtx,
 246                                      profile_probability prob
 247                                         = profile_probability::uninitialized ());
 248
 249 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 250 extern void emit_indirect_jump (rtx);
 251
 252 #include "insn-config.h"
 253
 254 #ifndef GCC_INSN_CONFIG_H
 255 #error "insn-config.h must be included before optabs.h"
 256 #endif
 257
 258 /* Emit a conditional move operation.  */
 259 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, machine_mode,
 260                            rtx, rtx, machine_mode, int);
 261
 262 /* Emit a conditional negate or bitwise complement operation.  */
 263 rtx emit_conditional_neg_or_complement (rtx, rtx_code, machine_mode, rtx,
 264                                          rtx, rtx);
 265
 266 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, machine_mode,
 267                           rtx, rtx, machine_mode, int);
 268
 269 /* Create but don't emit one rtl instruction to perform certain operations.
 270    Modes must match; operands must meet the operation's predicates.
 271    Likewise for subtraction and for just copying.  */
 272 extern rtx_insn *gen_add2_insn (rtx, rtx);
 273 extern rtx_insn *gen_add3_insn (rtx, rtx, rtx);
 274 extern int have_add2_insn (rtx, rtx);
 275 extern rtx_insn *gen_addptr3_insn (rtx, rtx, rtx);
 276 extern int have_addptr3_insn (rtx, rtx, rtx);
 277 extern rtx_insn *gen_sub2_insn (rtx, rtx);
 278 extern rtx_insn *gen_sub3_insn (rtx, rtx, rtx);
 279 extern int have_sub2_insn (rtx, rtx);
 280
 281 /* Generate the body of an insn to extend Y (with mode MFROM)
 282    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 283 extern rtx_insn *gen_extend_insn (rtx, rtx, machine_mode, machine_mode, int);
 284
 285 /* Generate code for a FLOAT_EXPR.  */
 286 extern void expand_float (rtx, rtx, int);
 287
 288 /* Generate code for a FIX_EXPR.  */
 289 extern void expand_fix (rtx, rtx, int);
 290
 291 /* Generate code for a FIXED_CONVERT_EXPR.  */
 292 extern void expand_fixed_convert (rtx, rtx, int, int);
 293
 294 /* Generate code for float to integral conversion.  */
 295 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 296
 297 /* Report whether the machine description contains an insn which can
 298    perform the operation described by CODE and MODE.  */
 299 extern int have_insn_for (enum rtx_code, machine_mode);
 300
 301 /* Generate a conditional trap instruction.  */
 302 extern rtx_insn *gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 303
 304 /* Generate code for VEC_PERM_EXPR.  */
 305 extern rtx expand_vec_perm_var (machine_mode, rtx, rtx, rtx, rtx);
 306 extern rtx expand_vec_perm_const (machine_mode, rtx, rtx,
 307                                   const vec_perm_builder &, machine_mode, rtx);
 308
 309 /* Generate code for vector comparison.  */
 310 extern rtx expand_vec_cmp_expr (tree, tree, rtx);
 311
 312 /* Generate code for VEC_COND_EXPR.  */
 313 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 314
 315 /* Generate code for VEC_SERIES_EXPR.  */
 316 extern rtx expand_vec_series_expr (machine_mode, rtx, rtx, rtx);
 317
 318 /* Generate code for MULT_HIGHPART_EXPR.  */
 319 extern rtx expand_mult_highpart (machine_mode, rtx, rtx, rtx, bool);
 320
 321 extern rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 322 extern rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 323 extern rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 324 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 325                                             enum memmodel, enum memmodel);
 326 /* Generate memory barriers.  */
 327 extern void expand_mem_thread_fence (enum memmodel);
 328 extern void expand_mem_signal_fence (enum memmodel);
 329
 330 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 331 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 332 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 333                               bool);
 334
 335 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 336                                   rtx operand);
 337 extern bool valid_multiword_target_p (rtx);
 338 extern void create_convert_operand_from_type (struct expand_operand *op,
 339                                               rtx value, tree type);
 340 extern bool maybe_legitimize_operands (enum insn_code icode,
 341                                        unsigned int opno, unsigned int nops,
 342                                        struct expand_operand *ops);
 343 extern rtx_insn *maybe_gen_insn (enum insn_code icode, unsigned int nops,
 344                                  struct expand_operand *ops);
 345 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 346                                struct expand_operand *ops);
 347 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 348                                     struct expand_operand *ops);
 349 extern void expand_insn (enum insn_code icode, unsigned int nops,
 350                          struct expand_operand *ops);
 351 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 352                               struct expand_operand *ops);
 353
 354 extern enum rtx_code get_rtx_code (enum tree_code tcode, bool unsignedp);
 355
 356 #endif /* GCC_OPTABS_H */