gcc/optabs.h

   1 /* Definitions for code generation pass of GNU compiler.
   2    Copyright (C) 2001-2020 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->target = 0;
  82   op->unused = 0;
  83   op->mode = mode;
  84   op->value = value;
  85   op->int_value = int_value;
  86 }
  87
  88 /* Make OP describe an operand that must use rtx X, even if X is volatile.  */
  89
  90 static inline void
  91 create_fixed_operand (class expand_operand *op, rtx x)
  92 {
  93   create_expand_operand (op, EXPAND_FIXED, x, VOIDmode, false);
  94 }
  95
  96 /* Make OP describe an output operand that must have mode MODE.
  97    X, if nonnull, is a suggestion for where the output should be stored.
  98    It is OK for VALUE to be inconsistent with MODE, although it will just
  99    be ignored in that case.  */
 100
 101 static inline void
 102 create_output_operand (class expand_operand *op, rtx x,
 103                        machine_mode mode)
 104 {
 105   create_expand_operand (op, EXPAND_OUTPUT, x, mode, false);
 106 }
 107
 108 /* Make OP describe an input operand that must have mode MODE and
 109    value VALUE; MODE cannot be VOIDmode.  The backend may request that
 110    VALUE be copied into a different kind of rtx before being passed
 111    as an operand.  */
 112
 113 static inline void
 114 create_input_operand (class expand_operand *op, rtx value,
 115                       machine_mode mode)
 116 {
 117   create_expand_operand (op, EXPAND_INPUT, value, mode, false);
 118 }
 119
 120 /* Like create_input_operand, except that VALUE must first be converted
 121    to mode MODE.  UNSIGNED_P says whether VALUE is unsigned.  */
 122
 123 static inline void
 124 create_convert_operand_to (class expand_operand *op, rtx value,
 125                            machine_mode mode, bool unsigned_p)
 126 {
 127   create_expand_operand (op, EXPAND_CONVERT_TO, value, mode, unsigned_p);
 128 }
 129
 130 /* Make OP describe an input operand that should have the same value
 131    as VALUE, after any mode conversion that the backend might request.
 132    If VALUE is a CONST_INT, it should be treated as having mode MODE.
 133    UNSIGNED_P says whether VALUE is unsigned.
 134
 135    The conversion of VALUE can include a combination of numerical
 136    conversion (as for convert_modes) and duplicating a scalar to fill
 137    a vector (if VALUE is a scalar but the operand is a vector).  */
 138
 139 static inline void
 140 create_convert_operand_from (class expand_operand *op, rtx value,
 141                              machine_mode mode, bool unsigned_p)
 142 {
 143   create_expand_operand (op, EXPAND_CONVERT_FROM, value, mode, unsigned_p);
 144 }
 145
 146
 147 /* Make OP describe an input Pmode address operand.  VALUE is the value
 148    of the address, but it may need to be converted to Pmode first.  */
 149
 150 static inline void
 151 create_address_operand (class expand_operand *op, rtx value)
 152 {
 153   create_expand_operand (op, EXPAND_ADDRESS, value, Pmode, false);
 154 }
 155
 156 extern void create_integer_operand (class expand_operand *, poly_int64);
 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 extern rtx expand_vector_broadcast (machine_mode, rtx);
 185
 186 /* Generate code for a simple binary or unary operation.  "Simple" in
 187    this case means "can be unambiguously described by a (mode, code)
 188    pair and mapped to a single optab."  */
 189 extern rtx expand_simple_binop (machine_mode, enum rtx_code, rtx,
 190                                 rtx, rtx, int, enum optab_methods);
 191
 192 /* Expand a binary operation given optab and rtx operands.  */
 193 extern rtx expand_binop (machine_mode, optab, rtx, rtx, rtx, int,
 194                          enum optab_methods);
 195
 196 /* Expand a binary operation with both signed and unsigned forms.  */
 197 extern rtx sign_expand_binop (machine_mode, optab, optab, rtx, rtx,
 198                               rtx, int, enum optab_methods);
 199
 200 /* Generate code to perform an operation on one operand with two results.  */
 201 extern int expand_twoval_unop (optab, rtx, rtx, rtx, int);
 202
 203 /* Generate code to perform an operation on two operands with two results.  */
 204 extern int expand_twoval_binop (optab, rtx, rtx, rtx, rtx, int);
 205
 206 /* Generate code to perform an operation on two operands with two
 207    results, using a library function.  */
 208 extern bool expand_twoval_binop_libfunc (optab, rtx, rtx, rtx, rtx,
 209                                          enum rtx_code);
 210 extern rtx expand_simple_unop (machine_mode, enum rtx_code, rtx, rtx,
 211                                int);
 212
 213 /* Expand a unary arithmetic operation given optab rtx operand.  */
 214 extern rtx expand_unop (machine_mode, optab, rtx, rtx, int);
 215
 216 /* Expand the absolute value operation.  */
 217 extern rtx expand_abs_nojump (machine_mode, rtx, rtx, int);
 218 extern rtx expand_abs (machine_mode, rtx, rtx, int, int);
 219
 220 /* Expand the one's complement absolute value operation.  */
 221 extern rtx expand_one_cmpl_abs_nojump (machine_mode, rtx, rtx);
 222
 223 /* Expand the copysign operation.  */
 224 extern rtx expand_copysign (rtx, rtx, rtx);
 225 /* Generate an instruction with a given INSN_CODE with an output and
 226    an input.  */
 227 extern bool maybe_emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 228 extern void emit_unop_insn (enum insn_code, rtx, rtx, enum rtx_code);
 229
 230 /* Emit code to make a call to a constant function or a library call.  */
 231 extern void emit_libcall_block (rtx_insn *, rtx, rtx, rtx);
 232
 233 /* The various uses that a comparison can have; used by can_compare_p:
 234    jumps, conditional moves, store flag operations.  */
 235 enum can_compare_purpose
 236 {
 237   ccp_jump,
 238   ccp_cmov,
 239   ccp_store_flag
 240 };
 241
 242 /* Nonzero if a compare of mode MODE can be done straightforwardly
 243    (without splitting it into pieces).  */
 244 extern int can_compare_p (enum rtx_code, machine_mode,
 245                           enum can_compare_purpose);
 246
 247 /* Return whether the backend can emit a vector comparison for code CODE,
 248    comparing operands of mode CMP_OP_MODE and producing a result with
 249    VALUE_MODE.  */
 250 extern bool can_vcond_compare_p (enum rtx_code, machine_mode, machine_mode);
 251
 252 extern rtx prepare_operand (enum insn_code, rtx, int, machine_mode,
 253                             machine_mode, int);
 254 /* Emit a pair of rtl insns to compare two rtx's and to jump
 255    to a label if the comparison is true.  */
 256 extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
 257                                      machine_mode, int, rtx,
 258                                      profile_probability prob
 259                                         = profile_probability::uninitialized ());
 260
 261 /* Generate code to indirectly jump to a location given in the rtx LOC.  */
 262 extern void emit_indirect_jump (rtx);
 263
 264 #include "insn-config.h"
 265
 266 #ifndef GCC_INSN_CONFIG_H
 267 #error "insn-config.h must be included before optabs.h"
 268 #endif
 269
 270 /* Emit a conditional move operation.  */
 271 rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, machine_mode,
 272                            rtx, rtx, machine_mode, int);
 273
 274 /* Emit a conditional negate or bitwise complement operation.  */
 275 rtx emit_conditional_neg_or_complement (rtx, rtx_code, machine_mode, rtx,
 276                                          rtx, rtx);
 277
 278 rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, machine_mode,
 279                           rtx, rtx, machine_mode, int);
 280
 281 /* Create but don't emit one rtl instruction to perform certain operations.
 282    Modes must match; operands must meet the operation's predicates.
 283    Likewise for subtraction and for just copying.  */
 284 extern rtx_insn *gen_add2_insn (rtx, rtx);
 285 extern rtx_insn *gen_add3_insn (rtx, rtx, rtx);
 286 extern int have_add2_insn (rtx, rtx);
 287 extern rtx_insn *gen_addptr3_insn (rtx, rtx, rtx);
 288 extern int have_addptr3_insn (rtx, rtx, rtx);
 289 extern rtx_insn *gen_sub2_insn (rtx, rtx);
 290 extern rtx_insn *gen_sub3_insn (rtx, rtx, rtx);
 291 extern int have_sub2_insn (rtx, rtx);
 292
 293 /* Generate the body of an insn to extend Y (with mode MFROM)
 294    into X (with mode MTO).  Do zero-extension if UNSIGNEDP is nonzero.  */
 295 extern rtx_insn *gen_extend_insn (rtx, rtx, machine_mode, machine_mode, int);
 296
 297 /* Generate code for a FLOAT_EXPR.  */
 298 extern void expand_float (rtx, rtx, int);
 299
 300 /* Generate code for a FIX_EXPR.  */
 301 extern void expand_fix (rtx, rtx, int);
 302
 303 /* Generate code for a FIXED_CONVERT_EXPR.  */
 304 extern void expand_fixed_convert (rtx, rtx, int, int);
 305
 306 /* Generate code for float to integral conversion.  */
 307 extern bool expand_sfix_optab (rtx, rtx, convert_optab);
 308
 309 /* Report whether the machine description contains an insn which can
 310    perform the operation described by CODE and MODE.  */
 311 extern int have_insn_for (enum rtx_code, machine_mode);
 312
 313 /* Generate a conditional trap instruction.  */
 314 extern rtx_insn *gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
 315
 316 /* Generate code for VEC_PERM_EXPR.  */
 317 extern rtx expand_vec_perm_var (machine_mode, rtx, rtx, rtx, rtx);
 318 extern rtx expand_vec_perm_const (machine_mode, rtx, rtx,
 319                                   const vec_perm_builder &, machine_mode, rtx);
 320
 321 /* Generate code for vector comparison.  */
 322 extern rtx expand_vec_cmp_expr (tree, tree, rtx);
 323
 324 /* Generate code for VEC_SERIES_EXPR.  */
 325 extern rtx expand_vec_series_expr (machine_mode, rtx, rtx, rtx);
 326
 327 /* Generate code for MULT_HIGHPART_EXPR.  */
 328 extern rtx expand_mult_highpart (machine_mode, rtx, rtx, rtx, bool);
 329
 330 extern rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
 331 extern rtx expand_atomic_test_and_set (rtx, rtx, enum memmodel);
 332 extern rtx expand_atomic_exchange (rtx, rtx, rtx, enum memmodel);
 333 extern bool expand_atomic_compare_and_swap (rtx *, rtx *, rtx, rtx, rtx, bool,
 334                                             enum memmodel, enum memmodel);
 335 /* Generate memory barriers.  */
 336 extern void expand_mem_thread_fence (enum memmodel);
 337 extern void expand_mem_signal_fence (enum memmodel);
 338
 339 rtx expand_atomic_load (rtx, rtx, enum memmodel);
 340 rtx expand_atomic_store (rtx, rtx, enum memmodel, bool);
 341 rtx expand_atomic_fetch_op (rtx, rtx, rtx, enum rtx_code, enum memmodel,
 342                               bool);
 343
 344 extern bool insn_operand_matches (enum insn_code icode, unsigned int opno,
 345                                   rtx operand);
 346 extern bool valid_multiword_target_p (rtx);
 347 extern void create_convert_operand_from_type (class expand_operand *op,
 348                                               rtx value, tree type);
 349 extern bool maybe_legitimize_operands (enum insn_code icode,
 350                                        unsigned int opno, unsigned int nops,
 351                                        class expand_operand *ops);
 352 extern rtx_insn *maybe_gen_insn (enum insn_code icode, unsigned int nops,
 353                                  class expand_operand *ops);
 354 extern bool maybe_expand_insn (enum insn_code icode, unsigned int nops,
 355                                class expand_operand *ops);
 356 extern bool maybe_expand_jump_insn (enum insn_code icode, unsigned int nops,
 357                                     class expand_operand *ops);
 358 extern void expand_insn (enum insn_code icode, unsigned int nops,
 359                          class expand_operand *ops);
 360 extern void expand_jump_insn (enum insn_code icode, unsigned int nops,
 361                               class expand_operand *ops);
 362
 363 extern enum rtx_code get_rtx_code (enum tree_code tcode, bool unsignedp);
 364 extern rtx vector_compare_rtx (machine_mode cmp_mode, enum tree_code tcode,
 365                                tree t_op0, tree t_op1, bool unsignedp,
 366                                enum insn_code icode, unsigned int opno);
 367
 368
 369 #endif /* GCC_OPTABS_H */