gcc/common/config/i386/i386-common.c

   1 /* IA-32 common hooks.
   2    Copyright (C) 1988-2014 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "diagnostic-core.h"
  24 #include "tm.h"
  25 #include "tm_p.h"
  26 #include "common/common-target.h"
  27 #include "common/common-target-def.h"
  28 #include "opts.h"
  29 #include "flags.h"
  30
  31 /* Define a set of ISAs which are available when a given ISA is
  32    enabled.  MMX and SSE ISAs are handled separately.  */
  33
  34 #define OPTION_MASK_ISA_MMX_SET OPTION_MASK_ISA_MMX
  35 #define OPTION_MASK_ISA_3DNOW_SET \
  36   (OPTION_MASK_ISA_3DNOW | OPTION_MASK_ISA_MMX_SET)
  37
  38 #define OPTION_MASK_ISA_SSE_SET OPTION_MASK_ISA_SSE
  39 #define OPTION_MASK_ISA_SSE2_SET \
  40   (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE_SET)
  41 #define OPTION_MASK_ISA_SSE3_SET \
  42   (OPTION_MASK_ISA_SSE3 | OPTION_MASK_ISA_SSE2_SET)
  43 #define OPTION_MASK_ISA_SSSE3_SET \
  44   (OPTION_MASK_ISA_SSSE3 | OPTION_MASK_ISA_SSE3_SET)
  45 #define OPTION_MASK_ISA_SSE4_1_SET \
  46   (OPTION_MASK_ISA_SSE4_1 | OPTION_MASK_ISA_SSSE3_SET)
  47 #define OPTION_MASK_ISA_SSE4_2_SET \
  48   (OPTION_MASK_ISA_SSE4_2 | OPTION_MASK_ISA_SSE4_1_SET)
  49 #define OPTION_MASK_ISA_AVX_SET \
  50   (OPTION_MASK_ISA_AVX | OPTION_MASK_ISA_SSE4_2_SET \
  51    | OPTION_MASK_ISA_XSAVE_SET)
  52 #define OPTION_MASK_ISA_FMA_SET \
  53   (OPTION_MASK_ISA_FMA | OPTION_MASK_ISA_AVX_SET)
  54 #define OPTION_MASK_ISA_AVX2_SET \
  55   (OPTION_MASK_ISA_AVX2 | OPTION_MASK_ISA_AVX_SET)
  56 #define OPTION_MASK_ISA_FXSR_SET OPTION_MASK_ISA_FXSR
  57 #define OPTION_MASK_ISA_XSAVE_SET OPTION_MASK_ISA_XSAVE
  58 #define OPTION_MASK_ISA_XSAVEOPT_SET \
  59   (OPTION_MASK_ISA_XSAVEOPT | OPTION_MASK_ISA_XSAVE)
  60 #define OPTION_MASK_ISA_AVX512F_SET \
  61   (OPTION_MASK_ISA_AVX512F | OPTION_MASK_ISA_AVX2_SET)
  62 #define OPTION_MASK_ISA_AVX512CD_SET \
  63   (OPTION_MASK_ISA_AVX512CD | OPTION_MASK_ISA_AVX512F_SET)
  64 #define OPTION_MASK_ISA_AVX512PF_SET \
  65   (OPTION_MASK_ISA_AVX512PF | OPTION_MASK_ISA_AVX512F_SET)
  66 #define OPTION_MASK_ISA_AVX512ER_SET \
  67   (OPTION_MASK_ISA_AVX512ER | OPTION_MASK_ISA_AVX512F_SET)
  68 #define OPTION_MASK_ISA_AVX512DQ_SET \
  69   (OPTION_MASK_ISA_AVX512DQ | OPTION_MASK_ISA_AVX512F_SET)
  70 #define OPTION_MASK_ISA_AVX512BW_SET \
  71   (OPTION_MASK_ISA_AVX512BW | OPTION_MASK_ISA_AVX512F_SET)
  72 #define OPTION_MASK_ISA_AVX512VL_SET \
  73   (OPTION_MASK_ISA_AVX512VL | OPTION_MASK_ISA_AVX512F_SET)
  74 #define OPTION_MASK_ISA_RTM_SET OPTION_MASK_ISA_RTM
  75 #define OPTION_MASK_ISA_PRFCHW_SET OPTION_MASK_ISA_PRFCHW
  76 #define OPTION_MASK_ISA_RDSEED_SET OPTION_MASK_ISA_RDSEED
  77 #define OPTION_MASK_ISA_ADX_SET OPTION_MASK_ISA_ADX
  78 #define OPTION_MASK_ISA_PREFETCHWT1_SET OPTION_MASK_ISA_PREFETCHWT1
  79 #define OPTION_MASK_ISA_CLFLUSHOPT_SET OPTION_MASK_ISA_CLFLUSHOPT
  80 #define OPTION_MASK_ISA_XSAVES_SET \
  81   (OPTION_MASK_ISA_XSAVES | OPTION_MASK_ISA_XSAVE)
  82 #define OPTION_MASK_ISA_XSAVEC_SET \
  83   (OPTION_MASK_ISA_XSAVEC | OPTION_MASK_ISA_XSAVE)
  84
  85 /* SSE4 includes both SSE4.1 and SSE4.2. -msse4 should be the same
  86    as -msse4.2.  */
  87 #define OPTION_MASK_ISA_SSE4_SET OPTION_MASK_ISA_SSE4_2_SET
  88
  89 #define OPTION_MASK_ISA_SSE4A_SET \
  90   (OPTION_MASK_ISA_SSE4A | OPTION_MASK_ISA_SSE3_SET)
  91 #define OPTION_MASK_ISA_FMA4_SET \
  92   (OPTION_MASK_ISA_FMA4 | OPTION_MASK_ISA_SSE4A_SET \
  93    | OPTION_MASK_ISA_AVX_SET)
  94 #define OPTION_MASK_ISA_XOP_SET \
  95   (OPTION_MASK_ISA_XOP | OPTION_MASK_ISA_FMA4_SET)
  96 #define OPTION_MASK_ISA_LWP_SET \
  97   OPTION_MASK_ISA_LWP
  98
  99 /* AES, SHA and PCLMUL need SSE2 because they use xmm registers.  */
 100 #define OPTION_MASK_ISA_AES_SET \
 101   (OPTION_MASK_ISA_AES | OPTION_MASK_ISA_SSE2_SET)
 102 #define OPTION_MASK_ISA_SHA_SET \
 103   (OPTION_MASK_ISA_SHA | OPTION_MASK_ISA_SSE2_SET)
 104 #define OPTION_MASK_ISA_PCLMUL_SET \
 105   (OPTION_MASK_ISA_PCLMUL | OPTION_MASK_ISA_SSE2_SET)
 106
 107 #define OPTION_MASK_ISA_ABM_SET \
 108   (OPTION_MASK_ISA_ABM | OPTION_MASK_ISA_POPCNT)
 109
 110 #define OPTION_MASK_ISA_BMI_SET OPTION_MASK_ISA_BMI
 111 #define OPTION_MASK_ISA_BMI2_SET OPTION_MASK_ISA_BMI2
 112 #define OPTION_MASK_ISA_LZCNT_SET OPTION_MASK_ISA_LZCNT
 113 #define OPTION_MASK_ISA_TBM_SET OPTION_MASK_ISA_TBM
 114 #define OPTION_MASK_ISA_POPCNT_SET OPTION_MASK_ISA_POPCNT
 115 #define OPTION_MASK_ISA_CX16_SET OPTION_MASK_ISA_CX16
 116 #define OPTION_MASK_ISA_SAHF_SET OPTION_MASK_ISA_SAHF
 117 #define OPTION_MASK_ISA_MOVBE_SET OPTION_MASK_ISA_MOVBE
 118 #define OPTION_MASK_ISA_CRC32_SET OPTION_MASK_ISA_CRC32
 119
 120 #define OPTION_MASK_ISA_FSGSBASE_SET OPTION_MASK_ISA_FSGSBASE
 121 #define OPTION_MASK_ISA_RDRND_SET OPTION_MASK_ISA_RDRND
 122 #define OPTION_MASK_ISA_F16C_SET \
 123   (OPTION_MASK_ISA_F16C | OPTION_MASK_ISA_AVX_SET)
 124
 125 /* Define a set of ISAs which aren't available when a given ISA is
 126    disabled.  MMX and SSE ISAs are handled separately.  */
 127
 128 #define OPTION_MASK_ISA_MMX_UNSET \
 129   (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_3DNOW_UNSET)
 130 #define OPTION_MASK_ISA_3DNOW_UNSET \
 131   (OPTION_MASK_ISA_3DNOW | OPTION_MASK_ISA_3DNOW_A_UNSET)
 132 #define OPTION_MASK_ISA_3DNOW_A_UNSET OPTION_MASK_ISA_3DNOW_A
 133
 134 #define OPTION_MASK_ISA_SSE_UNSET \
 135   (OPTION_MASK_ISA_SSE | OPTION_MASK_ISA_SSE2_UNSET)
 136 #define OPTION_MASK_ISA_SSE2_UNSET \
 137   (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3_UNSET)
 138 #define OPTION_MASK_ISA_SSE3_UNSET \
 139   (OPTION_MASK_ISA_SSE3 \
 140    | OPTION_MASK_ISA_SSSE3_UNSET \
 141    | OPTION_MASK_ISA_SSE4A_UNSET )
 142 #define OPTION_MASK_ISA_SSSE3_UNSET \
 143   (OPTION_MASK_ISA_SSSE3 | OPTION_MASK_ISA_SSE4_1_UNSET)
 144 #define OPTION_MASK_ISA_SSE4_1_UNSET \
 145   (OPTION_MASK_ISA_SSE4_1 | OPTION_MASK_ISA_SSE4_2_UNSET)
 146 #define OPTION_MASK_ISA_SSE4_2_UNSET \
 147   (OPTION_MASK_ISA_SSE4_2 | OPTION_MASK_ISA_AVX_UNSET )
 148 #define OPTION_MASK_ISA_AVX_UNSET \
 149   (OPTION_MASK_ISA_AVX | OPTION_MASK_ISA_FMA_UNSET \
 150    | OPTION_MASK_ISA_FMA4_UNSET | OPTION_MASK_ISA_F16C_UNSET \
 151    | OPTION_MASK_ISA_AVX2_UNSET | OPTION_MASK_ISA_XSAVE_UNSET)
 152 #define OPTION_MASK_ISA_FMA_UNSET OPTION_MASK_ISA_FMA
 153 #define OPTION_MASK_ISA_FXSR_UNSET OPTION_MASK_ISA_FXSR
 154 #define OPTION_MASK_ISA_XSAVE_UNSET \
 155   (OPTION_MASK_ISA_XSAVE | OPTION_MASK_ISA_XSAVEOPT_UNSET)
 156 #define OPTION_MASK_ISA_XSAVEOPT_UNSET OPTION_MASK_ISA_XSAVEOPT
 157 #define OPTION_MASK_ISA_AVX2_UNSET \
 158   (OPTION_MASK_ISA_AVX2 | OPTION_MASK_ISA_AVX512F_UNSET)
 159 #define OPTION_MASK_ISA_AVX512F_UNSET \
 160   (OPTION_MASK_ISA_AVX512F | OPTION_MASK_ISA_AVX512CD_UNSET \
 161    | OPTION_MASK_ISA_AVX512PF_UNSET | OPTION_MASK_ISA_AVX512ER_UNSET \
 162    | OPTION_MASK_ISA_AVX512DQ_UNSET | OPTION_MASK_ISA_AVX512BW_UNSET \
 163    | OPTION_MASK_ISA_AVX512VL_UNSET)
 164 #define OPTION_MASK_ISA_AVX512CD_UNSET OPTION_MASK_ISA_AVX512CD
 165 #define OPTION_MASK_ISA_AVX512PF_UNSET OPTION_MASK_ISA_AVX512PF
 166 #define OPTION_MASK_ISA_AVX512ER_UNSET OPTION_MASK_ISA_AVX512ER
 167 #define OPTION_MASK_ISA_AVX512DQ_UNSET OPTION_MASK_ISA_AVX512DQ
 168 #define OPTION_MASK_ISA_AVX512BW_UNSET OPTION_MASK_ISA_AVX512BW
 169 #define OPTION_MASK_ISA_AVX512VL_UNSET OPTION_MASK_ISA_AVX512VL
 170 #define OPTION_MASK_ISA_RTM_UNSET OPTION_MASK_ISA_RTM
 171 #define OPTION_MASK_ISA_PRFCHW_UNSET OPTION_MASK_ISA_PRFCHW
 172 #define OPTION_MASK_ISA_RDSEED_UNSET OPTION_MASK_ISA_RDSEED
 173 #define OPTION_MASK_ISA_ADX_UNSET OPTION_MASK_ISA_ADX
 174 #define OPTION_MASK_ISA_PREFETCHWT1_UNSET OPTION_MASK_ISA_PREFETCHWT1
 175 #define OPTION_MASK_ISA_CLFLUSHOPT_UNSET OPTION_MASK_ISA_CLFLUSHOPT
 176 #define OPTION_MASK_ISA_XSAVEC_UNSET OPTION_MASK_ISA_XSAVEC
 177 #define OPTION_MASK_ISA_XSAVES_UNSET OPTION_MASK_ISA_XSAVES
 178
 179 /* SSE4 includes both SSE4.1 and SSE4.2.  -mno-sse4 should the same
 180    as -mno-sse4.1. */
 181 #define OPTION_MASK_ISA_SSE4_UNSET OPTION_MASK_ISA_SSE4_1_UNSET
 182
 183 #define OPTION_MASK_ISA_SSE4A_UNSET \
 184   (OPTION_MASK_ISA_SSE4A | OPTION_MASK_ISA_FMA4_UNSET)
 185
 186 #define OPTION_MASK_ISA_FMA4_UNSET \
 187   (OPTION_MASK_ISA_FMA4 | OPTION_MASK_ISA_XOP_UNSET)
 188 #define OPTION_MASK_ISA_XOP_UNSET OPTION_MASK_ISA_XOP
 189 #define OPTION_MASK_ISA_LWP_UNSET OPTION_MASK_ISA_LWP
 190
 191 #define OPTION_MASK_ISA_AES_UNSET OPTION_MASK_ISA_AES
 192 #define OPTION_MASK_ISA_SHA_UNSET OPTION_MASK_ISA_SHA
 193 #define OPTION_MASK_ISA_PCLMUL_UNSET OPTION_MASK_ISA_PCLMUL
 194 #define OPTION_MASK_ISA_ABM_UNSET OPTION_MASK_ISA_ABM
 195 #define OPTION_MASK_ISA_BMI_UNSET OPTION_MASK_ISA_BMI
 196 #define OPTION_MASK_ISA_BMI2_UNSET OPTION_MASK_ISA_BMI2
 197 #define OPTION_MASK_ISA_LZCNT_UNSET OPTION_MASK_ISA_LZCNT
 198 #define OPTION_MASK_ISA_TBM_UNSET OPTION_MASK_ISA_TBM
 199 #define OPTION_MASK_ISA_POPCNT_UNSET OPTION_MASK_ISA_POPCNT
 200 #define OPTION_MASK_ISA_CX16_UNSET OPTION_MASK_ISA_CX16
 201 #define OPTION_MASK_ISA_SAHF_UNSET OPTION_MASK_ISA_SAHF
 202 #define OPTION_MASK_ISA_MOVBE_UNSET OPTION_MASK_ISA_MOVBE
 203 #define OPTION_MASK_ISA_CRC32_UNSET OPTION_MASK_ISA_CRC32
 204
 205 #define OPTION_MASK_ISA_FSGSBASE_UNSET OPTION_MASK_ISA_FSGSBASE
 206 #define OPTION_MASK_ISA_RDRND_UNSET OPTION_MASK_ISA_RDRND
 207 #define OPTION_MASK_ISA_F16C_UNSET OPTION_MASK_ISA_F16C
 208
 209 /* Implement TARGET_HANDLE_OPTION.  */
 210
 211 bool
 212 ix86_handle_option (struct gcc_options *opts,
 213                     struct gcc_options *opts_set ATTRIBUTE_UNUSED,
 214                     const struct cl_decoded_option *decoded,
 215                     location_t loc)
 216 {
 217   size_t code = decoded->opt_index;
 218   int value = decoded->value;
 219
 220   switch (code)
 221     {
 222     case OPT_mmmx:
 223       if (value)
 224         {
 225           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_MMX_SET;
 226           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MMX_SET;
 227         }
 228       else
 229         {
 230           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MMX_UNSET;
 231           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MMX_UNSET;
 232         }
 233       return true;
 234
 235     case OPT_m3dnow:
 236       if (value)
 237         {
 238           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_3DNOW_SET;
 239           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_3DNOW_SET;
 240         }
 241       else
 242         {
 243           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_3DNOW_UNSET;
 244           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_3DNOW_UNSET;
 245         }
 246       return true;
 247
 248     case OPT_m3dnowa:
 249       return false;
 250
 251     case OPT_msse:
 252       if (value)
 253         {
 254           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE_SET;
 255           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE_SET;
 256         }
 257       else
 258         {
 259           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE_UNSET;
 260           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE_UNSET;
 261         }
 262       return true;
 263
 264     case OPT_msse2:
 265       if (value)
 266         {
 267           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE2_SET;
 268           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE2_SET;
 269         }
 270       else
 271         {
 272           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE2_UNSET;
 273           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE2_UNSET;
 274         }
 275       return true;
 276
 277     case OPT_msse3:
 278       if (value)
 279         {
 280           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE3_SET;
 281           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE3_SET;
 282         }
 283       else
 284         {
 285           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE3_UNSET;
 286           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE3_UNSET;
 287         }
 288       return true;
 289
 290     case OPT_mssse3:
 291       if (value)
 292         {
 293           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSSE3_SET;
 294           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSSE3_SET;
 295         }
 296       else
 297         {
 298           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSSE3_UNSET;
 299           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSSE3_UNSET;
 300         }
 301       return true;
 302
 303     case OPT_msse4_1:
 304       if (value)
 305         {
 306           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_1_SET;
 307           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_1_SET;
 308         }
 309       else
 310         {
 311           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_1_UNSET;
 312           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_1_UNSET;
 313         }
 314       return true;
 315
 316     case OPT_msse4_2:
 317       if (value)
 318         {
 319           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_2_SET;
 320           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_2_SET;
 321         }
 322       else
 323         {
 324           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_2_UNSET;
 325           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_2_UNSET;
 326         }
 327       return true;
 328
 329     case OPT_mavx:
 330       if (value)
 331         {
 332           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX_SET;
 333           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX_SET;
 334         }
 335       else
 336         {
 337           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX_UNSET;
 338           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX_UNSET;
 339         }
 340       return true;
 341
 342     case OPT_mavx2:
 343       if (value)
 344         {
 345           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX2_SET;
 346           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX2_SET;
 347         }
 348       else
 349         {
 350           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX2_UNSET;
 351           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX2_UNSET;
 352         }
 353       return true;
 354
 355     case OPT_mavx512f:
 356       if (value)
 357         {
 358           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512F_SET;
 359           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512F_SET;
 360         }
 361       else
 362         {
 363           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512F_UNSET;
 364           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512F_UNSET;
 365         }
 366       return true;
 367
 368     case OPT_mavx512cd:
 369       if (value)
 370         {
 371           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512CD_SET;
 372           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512CD_SET;
 373         }
 374       else
 375         {
 376           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512CD_UNSET;
 377           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512CD_UNSET;
 378         }
 379       return true;
 380
 381     case OPT_mavx512pf:
 382       if (value)
 383         {
 384           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512PF_SET;
 385           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512PF_SET;
 386         }
 387       else
 388         {
 389           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512PF_UNSET;
 390           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512PF_UNSET;
 391         }
 392       return true;
 393
 394     case OPT_mavx512er:
 395       if (value)
 396         {
 397           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512ER_SET;
 398           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512ER_SET;
 399         }
 400       else
 401         {
 402           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512ER_UNSET;
 403           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512ER_UNSET;
 404         }
 405       return true;
 406
 407     case OPT_mavx512dq:
 408       if (value)
 409         {
 410           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512DQ_SET;
 411           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512DQ_SET;
 412         }
 413       else
 414         {
 415           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512DQ_UNSET;
 416           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512DQ_UNSET;
 417         }
 418       return true;
 419
 420     case OPT_mavx512bw:
 421       if (value)
 422         {
 423           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512BW_SET;
 424           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512BW_SET;
 425         }
 426       else
 427         {
 428           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512BW_UNSET;
 429           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512BW_UNSET;
 430         }
 431       return true;
 432
 433     case OPT_mavx512vl:
 434       if (value)
 435         {
 436           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX512VL_SET;
 437           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512VL_SET;
 438         }
 439       else
 440         {
 441           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX512VL_UNSET;
 442           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX512VL_UNSET;
 443         }
 444       return true;
 445
 446     case OPT_mfma:
 447       if (value)
 448         {
 449           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FMA_SET;
 450           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA_SET;
 451         }
 452       else
 453         {
 454           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FMA_UNSET;
 455           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA_UNSET;
 456         }
 457       return true;
 458
 459     case OPT_mrtm:
 460       if (value)
 461         {
 462           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_RTM_SET;
 463           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RTM_SET;
 464         }
 465       else
 466         {
 467           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_RTM_UNSET;
 468           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RTM_UNSET;
 469         }
 470       return true;
 471
 472     case OPT_msse4:
 473       opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_SET;
 474       opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_SET;
 475       return true;
 476
 477     case OPT_mno_sse4:
 478       opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_UNSET;
 479       opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_UNSET;
 480       return true;
 481
 482     case OPT_msse4a:
 483       if (value)
 484         {
 485           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4A_SET;
 486           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4A_SET;
 487         }
 488       else
 489         {
 490           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4A_UNSET;
 491           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4A_UNSET;
 492         }
 493       return true;
 494
 495     case OPT_mfma4:
 496       if (value)
 497         {
 498           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FMA4_SET;
 499           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA4_SET;
 500         }
 501       else
 502         {
 503           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FMA4_UNSET;
 504           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA4_UNSET;
 505         }
 506       return true;
 507
 508    case OPT_mxop:
 509       if (value)
 510         {
 511           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XOP_SET;
 512           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XOP_SET;
 513         }
 514       else
 515         {
 516           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XOP_UNSET;
 517           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XOP_UNSET;
 518         }
 519       return true;
 520
 521    case OPT_mlwp:
 522       if (value)
 523         {
 524           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_LWP_SET;
 525           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LWP_SET;
 526         }
 527       else
 528         {
 529           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_LWP_UNSET;
 530           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LWP_UNSET;
 531         }
 532       return true;
 533
 534     case OPT_mabm:
 535       if (value)
 536         {
 537           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_ABM_SET;
 538           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ABM_SET;
 539         }
 540       else
 541         {
 542           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_ABM_UNSET;
 543           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ABM_UNSET;
 544         }
 545       return true;
 546
 547     case OPT_mbmi:
 548       if (value)
 549         {
 550           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_BMI_SET;
 551           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI_SET;
 552         }
 553       else
 554         {
 555           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_BMI_UNSET;
 556           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI_UNSET;
 557         }
 558       return true;
 559
 560     case OPT_mbmi2:
 561       if (value)
 562         {
 563           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_BMI2_SET;
 564           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI2_SET;
 565         }
 566       else
 567         {
 568           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_BMI2_UNSET;
 569           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI2_UNSET;
 570         }
 571       return true;
 572
 573     case OPT_mlzcnt:
 574       if (value)
 575         {
 576           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_LZCNT_SET;
 577           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LZCNT_SET;
 578         }
 579       else
 580         {
 581           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_LZCNT_UNSET;
 582           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LZCNT_UNSET;
 583         }
 584       return true;
 585
 586     case OPT_mtbm:
 587       if (value)
 588         {
 589           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_TBM_SET;
 590           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_TBM_SET;
 591         }
 592       else
 593         {
 594           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_TBM_UNSET;
 595           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_TBM_UNSET;
 596         }
 597       return true;
 598
 599     case OPT_mpopcnt:
 600       if (value)
 601         {
 602           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_POPCNT_SET;
 603           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_POPCNT_SET;
 604         }
 605       else
 606         {
 607           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_POPCNT_UNSET;
 608           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_POPCNT_UNSET;
 609         }
 610       return true;
 611
 612     case OPT_msahf:
 613       if (value)
 614         {
 615           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SAHF_SET;
 616           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SAHF_SET;
 617         }
 618       else
 619         {
 620           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SAHF_UNSET;
 621           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SAHF_UNSET;
 622         }
 623       return true;
 624
 625     case OPT_mcx16:
 626       if (value)
 627         {
 628           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_CX16_SET;
 629           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CX16_SET;
 630         }
 631       else
 632         {
 633           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_CX16_UNSET;
 634           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CX16_UNSET;
 635         }
 636       return true;
 637
 638     case OPT_mmovbe:
 639       if (value)
 640         {
 641           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_MOVBE_SET;
 642           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MOVBE_SET;
 643         }
 644       else
 645         {
 646           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MOVBE_UNSET;
 647           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MOVBE_UNSET;
 648         }
 649       return true;
 650
 651     case OPT_mcrc32:
 652       if (value)
 653         {
 654           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_CRC32_SET;
 655           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CRC32_SET;
 656         }
 657       else
 658         {
 659           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_CRC32_UNSET;
 660           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CRC32_UNSET;
 661         }
 662       return true;
 663
 664     case OPT_maes:
 665       if (value)
 666         {
 667           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AES_SET;
 668           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AES_SET;
 669         }
 670       else
 671         {
 672           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AES_UNSET;
 673           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AES_UNSET;
 674         }
 675       return true;
 676
 677     case OPT_msha:
 678       if (value)
 679         {
 680           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SHA_SET;
 681           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SHA_SET;
 682         }
 683       else
 684         {
 685           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SHA_UNSET;
 686           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SHA_UNSET;
 687         }
 688       return true;
 689
 690     case OPT_mpclmul:
 691       if (value)
 692         {
 693           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_PCLMUL_SET;
 694           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PCLMUL_SET;
 695         }
 696       else
 697         {
 698           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_PCLMUL_UNSET;
 699           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PCLMUL_UNSET;
 700         }
 701       return true;
 702
 703     case OPT_mfsgsbase:
 704       if (value)
 705         {
 706           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FSGSBASE_SET;
 707           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FSGSBASE_SET;
 708         }
 709       else
 710         {
 711           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FSGSBASE_UNSET;
 712           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FSGSBASE_UNSET;
 713         }
 714       return true;
 715
 716     case OPT_mrdrnd:
 717       if (value)
 718         {
 719           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_RDRND_SET;
 720           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDRND_SET;
 721         }
 722       else
 723         {
 724           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_RDRND_UNSET;
 725           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDRND_UNSET;
 726         }
 727       return true;
 728
 729     case OPT_mf16c:
 730       if (value)
 731         {
 732           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_F16C_SET;
 733           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_F16C_SET;
 734         }
 735       else
 736         {
 737           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_F16C_UNSET;
 738           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_F16C_UNSET;
 739         }
 740       return true;
 741
 742     case OPT_mfxsr:
 743       if (value)
 744         {
 745           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FXSR_SET;
 746           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FXSR_SET;
 747         }
 748       else
 749         {
 750           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FXSR_UNSET;
 751           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FXSR_UNSET;
 752         }
 753       return true;
 754
 755     case OPT_mxsave:
 756       if (value)
 757         {
 758           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XSAVE_SET;
 759           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVE_SET;
 760         }
 761       else
 762         {
 763           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XSAVE_UNSET;
 764           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVE_UNSET;
 765         }
 766       return true;
 767
 768     case OPT_mxsaveopt:
 769       if (value)
 770         {
 771           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XSAVEOPT_SET;
 772           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVEOPT_SET;
 773         }
 774       else
 775         {
 776           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XSAVEOPT_UNSET;
 777           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVEOPT_UNSET;
 778         }
 779       return true;
 780
 781     case OPT_mxsavec:
 782       if (value)
 783         {
 784           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XSAVEC_SET;
 785           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVEC_SET;
 786         }
 787       else
 788         {
 789           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XSAVEC_UNSET;
 790           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVEC_UNSET;
 791         }
 792       return true;
 793
 794     case OPT_mxsaves:
 795       if (value)
 796         {
 797           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XSAVES_SET;
 798           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVES_SET;
 799         }
 800       else
 801         {
 802           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XSAVES_UNSET;
 803           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XSAVES_UNSET;
 804         }
 805       return true;
 806
 807     case OPT_mrdseed:
 808       if (value)
 809         {
 810           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_RDSEED_SET;
 811           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDSEED_SET;
 812         }
 813       else
 814         {
 815           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_RDSEED_UNSET;
 816           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDSEED_UNSET;
 817         }
 818       return true;
 819
 820     case OPT_mprfchw:
 821       if (value)
 822         {
 823           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_PRFCHW_SET;
 824           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PRFCHW_SET;
 825         }
 826       else
 827         {
 828           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_PRFCHW_UNSET;
 829           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PRFCHW_UNSET;
 830         }
 831       return true;
 832
 833     case OPT_madx:
 834       if (value)
 835         {
 836           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_ADX_SET;
 837           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ADX_SET;
 838         }
 839       else
 840         {
 841           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_ADX_UNSET;
 842           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ADX_UNSET;
 843         }
 844       return true;
 845
 846     case OPT_mprefetchwt1:
 847       if (value)
 848         {
 849           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_PREFETCHWT1_SET;
 850           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PREFETCHWT1_SET;
 851         }
 852       else
 853         {
 854           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_PREFETCHWT1_UNSET;
 855           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PREFETCHWT1_UNSET;
 856         }
 857       return true;
 858
 859     case OPT_mclflushopt:
 860       if (value)
 861         {
 862           opts->x_ix86_isa_flags |= OPTION_MASK_ISA_CLFLUSHOPT_SET;
 863           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CLFLUSHOPT_SET;
 864         }
 865       else
 866         {
 867           opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_CLFLUSHOPT_UNSET;
 868           opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CLFLUSHOPT_UNSET;
 869         }
 870       return true;
 871
 872   /* Comes from final.c -- no real reason to change it.  */
 873 #define MAX_CODE_ALIGN 16
 874
 875     case OPT_malign_loops_:
 876       warning_at (loc, 0, "-malign-loops is obsolete, use -falign-loops");
 877       if (value > MAX_CODE_ALIGN)
 878         error_at (loc, "-malign-loops=%d is not between 0 and %d",
 879                   value, MAX_CODE_ALIGN);
 880       else
 881         opts->x_align_loops = 1 << value;
 882       return true;
 883
 884     case OPT_malign_jumps_:
 885       warning_at (loc, 0, "-malign-jumps is obsolete, use -falign-jumps");
 886       if (value > MAX_CODE_ALIGN)
 887         error_at (loc, "-malign-jumps=%d is not between 0 and %d",
 888                   value, MAX_CODE_ALIGN);
 889       else
 890         opts->x_align_jumps = 1 << value;
 891       return true;
 892
 893     case OPT_malign_functions_:
 894       warning_at (loc, 0,
 895                   "-malign-functions is obsolete, use -falign-functions");
 896       if (value > MAX_CODE_ALIGN)
 897         error_at (loc, "-malign-functions=%d is not between 0 and %d",
 898                   value, MAX_CODE_ALIGN);
 899       else
 900         opts->x_align_functions = 1 << value;
 901       return true;
 902
 903     case OPT_mbranch_cost_:
 904       if (value > 5)
 905         {
 906           error_at (loc, "-mbranch-cost=%d is not between 0 and 5", value);
 907           opts->x_ix86_branch_cost = 5;
 908         }
 909       return true;
 910
 911     default:
 912       return true;
 913     }
 914 }
 915
 916 static const struct default_options ix86_option_optimization_table[] =
 917   {
 918     /* Enable redundant extension instructions removal at -O2 and higher.  */
 919     { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
 920     /* Enable function splitting at -O2 and higher.  */
 921     { OPT_LEVELS_2_PLUS, OPT_freorder_blocks_and_partition, NULL, 1 },
 922     /* Turn off -fschedule-insns by default.  It tends to make the
 923        problem with not enough registers even worse.  */
 924     { OPT_LEVELS_ALL, OPT_fschedule_insns, NULL, 0 },
 925
 926 #ifdef SUBTARGET_OPTIMIZATION_OPTIONS
 927     SUBTARGET_OPTIMIZATION_OPTIONS,
 928 #endif
 929     { OPT_LEVELS_NONE, 0, NULL, 0 }
 930   };
 931
 932 /* Implement TARGET_OPTION_INIT_STRUCT.  */
 933
 934 static void
 935 ix86_option_init_struct (struct gcc_options *opts)
 936 {
 937   if (TARGET_MACHO)
 938     /* The Darwin libraries never set errno, so we might as well
 939        avoid calling them when that's the only reason we would.  */
 940     opts->x_flag_errno_math = 0;
 941
 942   opts->x_flag_pcc_struct_return = 2;
 943   opts->x_flag_asynchronous_unwind_tables = 2;
 944 }
 945
 946 /* On the x86 -fsplit-stack and -fstack-protector both use the same
 947    field in the TCB, so they can not be used together.  */
 948
 949 static bool
 950 ix86_supports_split_stack (bool report ATTRIBUTE_UNUSED,
 951                            struct gcc_options *opts ATTRIBUTE_UNUSED)
 952 {
 953   bool ret = true;
 954
 955 #ifndef TARGET_THREAD_SPLIT_STACK_OFFSET
 956   if (report)
 957     error ("%<-fsplit-stack%> currently only supported on GNU/Linux");
 958   ret = false;
 959 #else
 960   if (!HAVE_GAS_CFI_PERSONALITY_DIRECTIVE)
 961     {
 962       if (report)
 963         error ("%<-fsplit-stack%> requires "
 964                "assembler support for CFI directives");
 965       ret = false;
 966     }
 967 #endif
 968
 969   return ret;
 970 }
 971
 972 /* Implement TARGET_EXCEPT_UNWIND_INFO.  */
 973
 974 static enum unwind_info_type
 975 i386_except_unwind_info (struct gcc_options *opts)
 976 {
 977   /* Honor the --enable-sjlj-exceptions configure switch.  */
 978 #ifdef CONFIG_SJLJ_EXCEPTIONS
 979   if (CONFIG_SJLJ_EXCEPTIONS)
 980     return UI_SJLJ;
 981 #endif
 982
 983   /* On windows 64, prefer SEH exceptions over anything else.  */
 984   if (TARGET_64BIT && DEFAULT_ABI == MS_ABI && opts->x_flag_unwind_tables)
 985     return UI_SEH;
 986
 987   if (DWARF2_UNWIND_INFO)
 988     return UI_DWARF2;
 989
 990   return UI_SJLJ;
 991 }
 992
 993 #undef  TARGET_EXCEPT_UNWIND_INFO
 994 #define TARGET_EXCEPT_UNWIND_INFO  i386_except_unwind_info
 995
 996 #undef TARGET_DEFAULT_TARGET_FLAGS
 997 #define TARGET_DEFAULT_TARGET_FLAGS     \
 998   (TARGET_DEFAULT                       \
 999    | TARGET_SUBTARGET_DEFAULT           \
1000    | TARGET_TLS_DIRECT_SEG_REFS_DEFAULT)
1001
1002 #undef TARGET_HANDLE_OPTION
1003 #define TARGET_HANDLE_OPTION ix86_handle_option
1004
1005 #undef TARGET_OPTION_OPTIMIZATION_TABLE
1006 #define TARGET_OPTION_OPTIMIZATION_TABLE ix86_option_optimization_table
1007 #undef TARGET_OPTION_INIT_STRUCT
1008 #define TARGET_OPTION_INIT_STRUCT ix86_option_init_struct
1009
1010 #undef TARGET_SUPPORTS_SPLIT_STACK
1011 #define TARGET_SUPPORTS_SPLIT_STACK ix86_supports_split_stack
1012
1013 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;