gcc/optabs-query.h

   1 /* IR-agnostic target query functions relating to optabs
   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_QUERY_H
  21 #define GCC_OPTABS_QUERY_H
  22
  23 #include "insn-opinit.h"
  24 #include "target.h"
  25
  26 /* Return true if OP is a conversion optab.  */
  27
  28 inline bool
  29 convert_optab_p (optab op)
  30 {
  31   return op > unknown_optab && op <= LAST_CONV_OPTAB;
  32 }
  33
  34 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
  35    if the target does not have such an insn.  */
  36
  37 inline enum insn_code
  38 optab_handler (optab op, machine_mode mode)
  39 {
  40   unsigned scode = (op << 16) | mode;
  41   gcc_assert (op > LAST_CONV_OPTAB);
  42   return raw_optab_handler (scode);
  43 }
  44
  45 /* Return the insn used to perform conversion OP from mode FROM_MODE
  46    to mode TO_MODE; return CODE_FOR_nothing if the target does not have
  47    such an insn.  */
  48
  49 inline enum insn_code
  50 convert_optab_handler (convert_optab op, machine_mode to_mode,
  51                        machine_mode from_mode)
  52 {
  53   unsigned scode = (op << 16) | (from_mode << 8) | to_mode;
  54   gcc_assert (convert_optab_p (op));
  55   return raw_optab_handler (scode);
  56 }
  57
  58 enum insn_code convert_optab_handler (convert_optab, machine_mode,
  59                                       machine_mode, optimization_type);
  60
  61 /* Return the insn used to implement mode MODE of OP, or CODE_FOR_nothing
  62    if the target does not have such an insn.  */
  63
  64 inline enum insn_code
  65 direct_optab_handler (direct_optab op, machine_mode mode)
  66 {
  67   return optab_handler (op, mode);
  68 }
  69
  70 enum insn_code direct_optab_handler (convert_optab, machine_mode,
  71                                      optimization_type);
  72
  73 /* Return true if UNOPTAB is for a trapping-on-overflow operation.  */
  74
  75 inline bool
  76 trapv_unoptab_p (optab unoptab)
  77 {
  78   return (unoptab == negv_optab
  79           || unoptab == absv_optab);
  80 }
  81
  82 /* Return true if BINOPTAB is for a trapping-on-overflow operation.  */
  83
  84 inline bool
  85 trapv_binoptab_p (optab binoptab)
  86 {
  87   return (binoptab == addv_optab
  88           || binoptab == subv_optab
  89           || binoptab == smulv_optab);
  90 }
  91
  92 /* Return insn code for a comparison operator with VMODE
  93    resultin MASK_MODE, unsigned if UNS is true.  */
  94
  95 static inline enum insn_code
  96 get_vec_cmp_icode (machine_mode vmode, machine_mode mask_mode, bool uns)
  97 {
  98   optab tab = uns ? vec_cmpu_optab : vec_cmp_optab;
  99   return convert_optab_handler (tab, vmode, mask_mode);
 100 }
 101
 102 /* Return insn code for a comparison operator with VMODE
 103    resultin MASK_MODE (only for EQ/NE).  */
 104
 105 static inline enum insn_code
 106 get_vec_cmp_eq_icode (machine_mode vmode, machine_mode mask_mode)
 107 {
 108   return convert_optab_handler (vec_cmpeq_optab, vmode, mask_mode);
 109 }
 110
 111 /* Return insn code for a conditional operator with a comparison in
 112    mode CMODE, unsigned if UNS is true, resulting in a value of mode VMODE.  */
 113
 114 inline enum insn_code
 115 get_vcond_icode (machine_mode vmode, machine_mode cmode, bool uns)
 116 {
 117   enum insn_code icode = CODE_FOR_nothing;
 118   if (uns)
 119     icode = convert_optab_handler (vcondu_optab, vmode, cmode);
 120   else
 121     icode = convert_optab_handler (vcond_optab, vmode, cmode);
 122   return icode;
 123 }
 124
 125 /* Return insn code for a conditional operator with a mask mode
 126    MMODE resulting in a value of mode VMODE.  */
 127
 128 static inline enum insn_code
 129 get_vcond_mask_icode (machine_mode vmode, machine_mode mmode)
 130 {
 131   return convert_optab_handler (vcond_mask_optab, vmode, mmode);
 132 }
 133
 134 /* Return insn code for a conditional operator with a comparison in
 135    mode CMODE (only EQ/NE), resulting in a value of mode VMODE.  */
 136
 137 static inline enum insn_code
 138 get_vcond_eq_icode (machine_mode vmode, machine_mode cmode)
 139 {
 140   return convert_optab_handler (vcondeq_optab, vmode, cmode);
 141 }
 142
 143 /* Enumerates the possible extraction_insn operations.  */
 144 enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
 145
 146 /* Describes an instruction that inserts or extracts a bitfield.  */
 147 struct extraction_insn
 148 {
 149   /* The code of the instruction.  */
 150   enum insn_code icode;
 151
 152   /* The mode that the structure operand should have.  This is byte_mode
 153      when using the legacy insv, extv and extzv patterns to access memory.
 154      If no mode is given, the structure is a BLKmode memory.  */
 155   opt_scalar_int_mode struct_mode;
 156
 157   /* The mode of the field to be inserted or extracted, and by extension
 158      the mode of the insertion or extraction itself.  */
 159   scalar_int_mode field_mode;
 160
 161   /* The mode of the field's bit position.  This is only important
 162      when the position is variable rather than constant.  */
 163   scalar_int_mode pos_mode;
 164 };
 165
 166 bool get_best_reg_extraction_insn (extraction_insn *,
 167                                    enum extraction_pattern,
 168                                    unsigned HOST_WIDE_INT, machine_mode);
 169 bool get_best_mem_extraction_insn (extraction_insn *,
 170                                    enum extraction_pattern,
 171                                    HOST_WIDE_INT, HOST_WIDE_INT, machine_mode);
 172
 173 enum insn_code can_extend_p (machine_mode, machine_mode, int);
 174 enum insn_code can_float_p (machine_mode, machine_mode, int);
 175 enum insn_code can_fix_p (machine_mode, machine_mode, int, bool *);
 176 bool can_conditionally_move_p (machine_mode mode);
 177 opt_machine_mode qimode_for_vec_perm (machine_mode);
 178 bool selector_fits_mode_p (machine_mode, const vec_perm_indices &);
 179 bool can_vec_perm_var_p (machine_mode);
 180 bool can_vec_perm_const_p (machine_mode, const vec_perm_indices &,
 181                            bool = true);
 182 /* Find a widening optab even if it doesn't widen as much as we want.  */
 183 #define find_widening_optab_handler(A, B, C) \
 184   find_widening_optab_handler_and_mode (A, B, C, NULL)
 185 enum insn_code find_widening_optab_handler_and_mode (optab, machine_mode,
 186                                                      machine_mode,
 187                                                      machine_mode *);
 188 int can_mult_highpart_p (machine_mode, bool);
 189 bool can_vec_mask_load_store_p (machine_mode, machine_mode, bool);
 190 bool can_compare_and_swap_p (machine_mode, bool);
 191 bool can_atomic_exchange_p (machine_mode, bool);
 192 bool can_atomic_load_p (machine_mode);
 193 bool lshift_cheap_p (bool);
 194
 195 /* Version of find_widening_optab_handler_and_mode that operates on
 196    specific mode types.  */
 197
 198 template<typename T>
 199 inline enum insn_code
 200 find_widening_optab_handler_and_mode (optab op, const T &to_mode,
 201                                       const T &from_mode, T *found_mode)
 202 {
 203   machine_mode tmp;
 204   enum insn_code icode = find_widening_optab_handler_and_mode
 205     (op, machine_mode (to_mode), machine_mode (from_mode), &tmp);
 206   if (icode != CODE_FOR_nothing && found_mode)
 207     *found_mode = as_a <T> (tmp);
 208   return icode;
 209 }
 210
 211 #endif