gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001-2017 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
  26 /* Generate code for a widening multiply.  */
  27 extern rtx expand_widening_mult (machine_mode, rtx, rtx, rtx, int, optab);
  28
  29 /* Describes the type of an expand_operand.  Each value is associated
  30    with a create_*_operand function; see the comments above those
  31    functions for details.  */
  32 enum expand_operand_type {
  33   EXPAND_FIXED,
  34   EXPAND_OUTPUT,
  35   EXPAND_INPUT,
  36   EXPAND_CONVERT_TO,
  37   EXPAND_CONVERT_FROM,
  38   EXPAND_ADDRESS,
  39   EXPAND_INTEGER
  40 };
  41
  42 /* Information about an operand for instruction expansion.  */
  43 struct expand_operand {
  44   /* The type of operand.  */
  45   ENUM_BITFIELD (expand_operand_type) type : 8;
  46
  47   /* True if any conversion should treat VALUE as being unsigned
  48      rather than signed.  Only meaningful for certain types.  */
  49   unsigned int unsigned_p : 1;
  50
  51   /* Is the target operand.  */
  52   unsigned int target : 1;
  53
  54   /* Unused; available for future use.  */
  55   unsigned int unused : 6;
  56
  57   /* The mode passed to the convert_*_operand function.  It has a
  58      type-dependent meaning.  */
  59   ENUM_BITFIELD (machine_mode) mode : 16;
  60
  61   /* The value of the operand.  */
  62   rtx value;
  63 };
  64
  65 /* Initialize OP with the given fields.  Initialise the other fields
  66    to their default values.  */
  67
  68 static inline void
  69 create_expand_operand (struct expand_operand *op,
  70                        enum expand_operand_type type,
  71                        rtx value, machine_mode mode,
  72                        bool unsigned_p)
  73 {
  74   op->type = type;
  75   op->unsigned_p = unsigned_p;
  76   op->unused = 0;
  77   op->mode = mode;
  78   op->value = value;
  79 }
  80
  81 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
  82
  83 static inline void
  84 create_fixed_operand (struct expand_operand *op, rtx x)
  85 {
  86   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
  87 }
  88
  89 /* Make OP describe an output operand that must have mode MODE.
  90    X, if nonnull, is a suggestion for where the output should be stored.
  91    It is OK for VALUE to be inconsistent with MODE, although it will just
  92    be ignored in that case.  */
  93
  94 static inline void
  95 create_output_operand (struct expand_operand *op, rtx x,
  96                        machine_mode mode)
  97 {
  98   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
  99 }
 100
 101 /* Make OP describe an input operand that must have mode MODE and
 102    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 103    VALUE be copied into a different kind of rtx before being passed
 104    as an operand.  */
 105
 106 static inline void
 107 create_input_operand (struct expand_operand *op, rtx value,
 108                       machine_mode mode)
 109 {
 110   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 111 }
 112
 113 /* Like create_input_operand, except that VALUE must first be converted
 114    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 115
 116 static inline void
 117 create_convert_operand_to (struct expand_operand *op, rtx value,
 118                            machine_mode mode, bool unsigned_p)
 119 {
 120   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 121 }
 122
 123 /* Make OP describe an input operand that should have the same value
 124    as VALUE, after any mode conversion that the backend might request.
 125    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 126    UNSIGNED_P says whether VALUE is unsigned.  */
 127
 128 static inline void
 129 create_convert_operand_from (struct expand_operand *op, rtx value,
 130                              machine_mode mode, bool unsigned_p)
 131 {
 132   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 133 }
 134
 135
 136 /* Make OP describe an input Pmode address operand.  VALUE is the value
 137    of the address, but it may need to be converted to Pmode first.  */
 138
 139 static inline void
 140 create_address_operand (struct expand_operand *op, rtx value)
 141 {
 142   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 143 }
 144
 145 /* Make OP describe an input operand that has value INTVAL and that has
 146    no inherent mode.  This function should only be used for operands that
 147    are always expand-time constants.  The backend may request that INTVAL
 148    be copied into a different kind of rtx, but it must specify the mode
 149    of that rtx if so.  */
 150
 151 static inline void
 152 create_integer_operand (struct expand_operand *op, HOST_WIDE_INT intval)
 153 {
 154   create_expand_operand (op, EXPAND_INTEGER, GEN_INT (intval), VOIDmode, false);
 155 }
 156
 157
 158 /* Passed to expand_simple_binop and expand_binop to say which options
 159    to try to use if the requested operation can't be open-coded on the
 160    requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
 161    a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
 162    using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
 163    try anything else.  */
 164
 165 enum optab_methods
 166 {
 167   OPTAB_DIRECT,
 168   OPTAB_LIB,
 169   OPTAB_WIDEN,
 170   OPTAB_LIB_WIDEN,
 171   OPTAB_MUST_WIDEN
 172 };
 173
 174 extern rtx expand_widen_pattern_expr (struct separate_ops *, rtx , rtx , rtx,
 175                                       rtx, int);
 176 extern rtx expand_ternary_op (machine_mode mode, optab ternary_optab,
 177                               rtx op0, rtx op1, rtx op2, rtx target,
 178                               int unsignedp);
 179 extern rtx simplify_expand_binop (machine_mode mode, optab binoptab,
 180                                   rtx op0, rtx op1, rtx target, int unsignedp,
 181                                   enum optab_methods methods);
 182 extern bool force_expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 183                                 enum optab_methods);
 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 extern rtx prepare_operand (enum insn_code, rtx, int, machine_mode,
 246                             machine_mode, int);
 247 /* Emit a pair of rtl insns to compare two rtx's and to jump
 248    to a label if the comparison is true.  */
 249 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 250                                      machine_mode, int, rtx, int prob=-1);
 251
 252 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 253 extern void emit_indirect_jump (rtx);
 254
 255 #include "insn-config.h"
 256
 257 #ifndef GCC_INSN_CONFIG_H
 258 #error "insn-config.h must be included before optabs.h"
 259 #endif
 260
 261 /* Emit a conditional move operation.  */
 262 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, machine_mode,
 263                            rtx, rtx, machine_mode, int);
 264
 265 /* Emit a conditional negate or bitwise complement operation.  */
 266 rtx emit_conditional_neg_or_complement (rtx, rtx_code, machine_mode, rtx,
 267                                          rtx, rtx);
 268
 269 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, machine_mode,
 270                           rtx, rtx, machine_mode, int);
 271
 272 /* Create but don't emit one rtl instruction to perform certain operations.
 273    Modes must match; operands must meet the operation's predicates.
 274    Likewise for subtraction and for just copying.  */
 275 extern rtx_insn *gen_add2_insn (rtx, rtx);
 276 extern rtx_insn *gen_add3_insn (rtx, rtx, rtx);
 277 extern int have_add2_insn (rtx, rtx);
 278 extern rtx_insn *gen_addptr3_insn (rtx, rtx, rtx);
 279 extern int have_addptr3_insn (rtx, rtx, rtx);
 280 extern rtx_insn *gen_sub2_insn (rtx, rtx);
 281 extern rtx_insn *gen_sub3_insn (rtx, rtx, rtx);
 282 extern int have_sub2_insn (rtx, rtx);
 283
 284 /* Generate the body of an insn to extend Y (with mode MFROM)
 285    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 286 extern rtx_insn *gen_extend_insn (rtx, rtx, machine_mode, machine_mode, int);
 287
 288 /* Generate code for a FLOAT_EXPR.  */
 289 extern void expand_float (rtx, rtx, int);
 290
 291 /* Generate code for a FIX_EXPR.  */
 292 extern void expand_fix (rtx, rtx, int);
 293
 294 /* Generate code for a FIXED_CONVERT_EXPR.  */
 295 extern void expand_fixed_convert (rtx, rtx, int, int);
 296
 297 /* Generate code for float to integral conversion.  */
 298 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 299
 300 /* Report whether the machine description contains an insn which can
 301    perform the operation described by CODE and MODE.  */
 302 extern int have_insn_for (enum rtx_code, machine_mode);
 303
 304 /* Generate a conditional trap instruction.  */
 305 extern rtx_insn *gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 306
 307 /* Generate code for VEC_PERM_EXPR.  */
 308 extern rtx expand_vec_perm (machine_mode, rtx, rtx, rtx, rtx);
 309
 310 /* Generate code for vector comparison.  */
 311 extern rtx expand_vec_cmp_expr (tree, tree, rtx);
 312
 313 /* Generate code for VEC_COND_EXPR.  */
 314 extern rtx expand_vec_cond_expr (tree, tree, tree, tree, rtx);
 315
 316 /* Generate code for MULT_HIGHPART_EXPR.  */
 317 extern rtx expand_mult_highpart (machine_mode, rtx, rtx, rtx, bool);
 318
 319 extern rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 320 extern rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 321 extern rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 322 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 323                                             enum memmodel, enum memmodel);
 324 /* Generate memory barriers.  */
 325 extern void expand_mem_thread_fence (enum memmodel);
 326 extern void expand_mem_signal_fence (enum memmodel);
 327
 328 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 329 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 330 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 331                               bool);
 332
 333 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 334                                   rtx operand);
 335 extern bool valid_multiword_target_p (rtx);
 336 extern void create_convert_operand_from_type (struct expand_operand *op,
 337                                               rtx value, tree type);
 338 extern bool maybe_legitimize_operands (enum insn_code icode,
 339                                        unsigned int opno, unsigned int nops,
 340                                        struct expand_operand *ops);
 341 extern rtx_insn *maybe_gen_insn (enum insn_code icode, unsigned int nops,
 342                                  struct expand_operand *ops);
 343 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 344                                struct expand_operand *ops);
 345 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 346                                     struct expand_operand *ops);
 347 extern void expand_insn (enum insn_code icode, unsigned int nops,
 348                          struct expand_operand *ops);
 349 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 350                               struct expand_operand *ops);
 351
 352 extern enum rtx_code get_rtx_code (enum tree_code tcode, bool unsignedp);
 353
 354 #endif /* GCC_OPTABS_H */