xref: /dflybsd-src/contrib/gcc-4.7/gcc/common/config/i386/i386-common.c (revision 04febcfb30580676d3e95f58a16c5137ee478b32)

/* IA-32 common hooks.
   Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "diagnostic-core.h"
#include "tm.h"
#include "tm_p.h"
#include "common/common-target.h"
#include "common/common-target-def.h"
#include "opts.h"
#include "flags.h"

/* Define a set of ISAs which are available when a given ISA is
   enabled.  MMX and SSE ISAs are handled separately.  */

#define OPTION_MASK_ISA_MMX_SET OPTION_MASK_ISA_MMX
#define OPTION_MASK_ISA_3DNOW_SET \
  (OPTION_MASK_ISA_3DNOW | OPTION_MASK_ISA_MMX_SET)

#define OPTION_MASK_ISA_SSE_SET OPTION_MASK_ISA_SSE
#define OPTION_MASK_ISA_SSE2_SET \
  (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE_SET)
#define OPTION_MASK_ISA_SSE3_SET \
  (OPTION_MASK_ISA_SSE3 | OPTION_MASK_ISA_SSE2_SET)
#define OPTION_MASK_ISA_SSSE3_SET \
  (OPTION_MASK_ISA_SSSE3 | OPTION_MASK_ISA_SSE3_SET)
#define OPTION_MASK_ISA_SSE4_1_SET \
  (OPTION_MASK_ISA_SSE4_1 | OPTION_MASK_ISA_SSSE3_SET)
#define OPTION_MASK_ISA_SSE4_2_SET \
  (OPTION_MASK_ISA_SSE4_2 | OPTION_MASK_ISA_SSE4_1_SET)
#define OPTION_MASK_ISA_AVX_SET \
  (OPTION_MASK_ISA_AVX | OPTION_MASK_ISA_SSE4_2_SET)
#define OPTION_MASK_ISA_FMA_SET \
  (OPTION_MASK_ISA_FMA | OPTION_MASK_ISA_AVX_SET)
#define OPTION_MASK_ISA_AVX2_SET \
  (OPTION_MASK_ISA_AVX2 | OPTION_MASK_ISA_AVX_SET)

/* SSE4 includes both SSE4.1 and SSE4.2. -msse4 should be the same
   as -msse4.2.  */
#define OPTION_MASK_ISA_SSE4_SET OPTION_MASK_ISA_SSE4_2_SET

#define OPTION_MASK_ISA_SSE4A_SET \
  (OPTION_MASK_ISA_SSE4A | OPTION_MASK_ISA_SSE3_SET)
#define OPTION_MASK_ISA_FMA4_SET \
  (OPTION_MASK_ISA_FMA4 | OPTION_MASK_ISA_SSE4A_SET \
   | OPTION_MASK_ISA_AVX_SET)
#define OPTION_MASK_ISA_XOP_SET \
  (OPTION_MASK_ISA_XOP | OPTION_MASK_ISA_FMA4_SET)
#define OPTION_MASK_ISA_LWP_SET \
  OPTION_MASK_ISA_LWP

/* AES and PCLMUL need SSE2 because they use xmm registers */
#define OPTION_MASK_ISA_AES_SET \
  (OPTION_MASK_ISA_AES | OPTION_MASK_ISA_SSE2_SET)
#define OPTION_MASK_ISA_PCLMUL_SET \
  (OPTION_MASK_ISA_PCLMUL | OPTION_MASK_ISA_SSE2_SET)

#define OPTION_MASK_ISA_ABM_SET \
  (OPTION_MASK_ISA_ABM | OPTION_MASK_ISA_POPCNT)

#define OPTION_MASK_ISA_BMI_SET OPTION_MASK_ISA_BMI
#define OPTION_MASK_ISA_BMI2_SET OPTION_MASK_ISA_BMI2
#define OPTION_MASK_ISA_TBM_SET OPTION_MASK_ISA_TBM
#define OPTION_MASK_ISA_POPCNT_SET OPTION_MASK_ISA_POPCNT
#define OPTION_MASK_ISA_CX16_SET OPTION_MASK_ISA_CX16
#define OPTION_MASK_ISA_SAHF_SET OPTION_MASK_ISA_SAHF
#define OPTION_MASK_ISA_MOVBE_SET OPTION_MASK_ISA_MOVBE
#define OPTION_MASK_ISA_CRC32_SET OPTION_MASK_ISA_CRC32

#define OPTION_MASK_ISA_FSGSBASE_SET OPTION_MASK_ISA_FSGSBASE
#define OPTION_MASK_ISA_RDRND_SET OPTION_MASK_ISA_RDRND
#define OPTION_MASK_ISA_F16C_SET \
  (OPTION_MASK_ISA_F16C | OPTION_MASK_ISA_AVX_SET)

/* Define a set of ISAs which aren't available when a given ISA is
   disabled.  MMX and SSE ISAs are handled separately.  */

#define OPTION_MASK_ISA_MMX_UNSET \
  (OPTION_MASK_ISA_MMX | OPTION_MASK_ISA_3DNOW_UNSET)
#define OPTION_MASK_ISA_3DNOW_UNSET \
  (OPTION_MASK_ISA_3DNOW | OPTION_MASK_ISA_3DNOW_A_UNSET)
#define OPTION_MASK_ISA_3DNOW_A_UNSET OPTION_MASK_ISA_3DNOW_A

#define OPTION_MASK_ISA_SSE_UNSET \
  (OPTION_MASK_ISA_SSE | OPTION_MASK_ISA_SSE2_UNSET)
#define OPTION_MASK_ISA_SSE2_UNSET \
  (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE3_UNSET)
#define OPTION_MASK_ISA_SSE3_UNSET \
  (OPTION_MASK_ISA_SSE3 \
   | OPTION_MASK_ISA_SSSE3_UNSET \
   | OPTION_MASK_ISA_SSE4A_UNSET )
#define OPTION_MASK_ISA_SSSE3_UNSET \
  (OPTION_MASK_ISA_SSSE3 | OPTION_MASK_ISA_SSE4_1_UNSET)
#define OPTION_MASK_ISA_SSE4_1_UNSET \
  (OPTION_MASK_ISA_SSE4_1 | OPTION_MASK_ISA_SSE4_2_UNSET)
#define OPTION_MASK_ISA_SSE4_2_UNSET \
  (OPTION_MASK_ISA_SSE4_2 | OPTION_MASK_ISA_AVX_UNSET )
#define OPTION_MASK_ISA_AVX_UNSET \
  (OPTION_MASK_ISA_AVX | OPTION_MASK_ISA_FMA_UNSET \
   | OPTION_MASK_ISA_FMA4_UNSET | OPTION_MASK_ISA_F16C_UNSET \
   | OPTION_MASK_ISA_AVX2_UNSET)
#define OPTION_MASK_ISA_FMA_UNSET OPTION_MASK_ISA_FMA
#define OPTION_MASK_ISA_AVX2_UNSET OPTION_MASK_ISA_AVX2

/* SSE4 includes both SSE4.1 and SSE4.2.  -mno-sse4 should the same
   as -mno-sse4.1. */
#define OPTION_MASK_ISA_SSE4_UNSET OPTION_MASK_ISA_SSE4_1_UNSET

#define OPTION_MASK_ISA_SSE4A_UNSET \
  (OPTION_MASK_ISA_SSE4A | OPTION_MASK_ISA_FMA4_UNSET)

#define OPTION_MASK_ISA_FMA4_UNSET \
  (OPTION_MASK_ISA_FMA4 | OPTION_MASK_ISA_XOP_UNSET)
#define OPTION_MASK_ISA_XOP_UNSET OPTION_MASK_ISA_XOP
#define OPTION_MASK_ISA_LWP_UNSET OPTION_MASK_ISA_LWP

#define OPTION_MASK_ISA_AES_UNSET OPTION_MASK_ISA_AES
#define OPTION_MASK_ISA_PCLMUL_UNSET OPTION_MASK_ISA_PCLMUL
#define OPTION_MASK_ISA_ABM_UNSET OPTION_MASK_ISA_ABM
#define OPTION_MASK_ISA_BMI_UNSET OPTION_MASK_ISA_BMI
#define OPTION_MASK_ISA_BMI2_UNSET OPTION_MASK_ISA_BMI2
#define OPTION_MASK_ISA_TBM_UNSET OPTION_MASK_ISA_TBM
#define OPTION_MASK_ISA_POPCNT_UNSET OPTION_MASK_ISA_POPCNT
#define OPTION_MASK_ISA_CX16_UNSET OPTION_MASK_ISA_CX16
#define OPTION_MASK_ISA_SAHF_UNSET OPTION_MASK_ISA_SAHF
#define OPTION_MASK_ISA_MOVBE_UNSET OPTION_MASK_ISA_MOVBE
#define OPTION_MASK_ISA_CRC32_UNSET OPTION_MASK_ISA_CRC32

#define OPTION_MASK_ISA_FSGSBASE_UNSET OPTION_MASK_ISA_FSGSBASE
#define OPTION_MASK_ISA_RDRND_UNSET OPTION_MASK_ISA_RDRND
#define OPTION_MASK_ISA_F16C_UNSET OPTION_MASK_ISA_F16C

/* Implement TARGET_HANDLE_OPTION.  */

bool
ix86_handle_option (struct gcc_options *opts,
		    struct gcc_options *opts_set ATTRIBUTE_UNUSED,
		    const struct cl_decoded_option *decoded,
		    location_t loc)
{
  size_t code = decoded->opt_index;
  int value = decoded->value;

  switch (code)
    {
    case OPT_mmmx:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_MMX_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MMX_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MMX_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MMX_UNSET;
	}
      return true;

    case OPT_m3dnow:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_3DNOW_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_3DNOW_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_3DNOW_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_3DNOW_UNSET;
	}
      return true;

    case OPT_m3dnowa:
      return false;

    case OPT_msse:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE_UNSET;
	}
      return true;

    case OPT_msse2:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE2_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE2_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE2_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE2_UNSET;
	}
      return true;

    case OPT_msse3:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE3_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE3_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE3_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE3_UNSET;
	}
      return true;

    case OPT_mssse3:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSSE3_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSSE3_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSSE3_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSSE3_UNSET;
	}
      return true;

    case OPT_msse4_1:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_1_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_1_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_1_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_1_UNSET;
	}
      return true;

    case OPT_msse4_2:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_2_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_2_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_2_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_2_UNSET;
	}
      return true;

    case OPT_mavx:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX_UNSET;
	}
      return true;

    case OPT_mavx2:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AVX2_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX2_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AVX2_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AVX2_UNSET;
	}
      return true;

    case OPT_mfma:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FMA_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FMA_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA_UNSET;
	}
      return true;

    case OPT_msse4:
      opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4_SET;
      opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_SET;
      return true;

    case OPT_mno_sse4:
      opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4_UNSET;
      opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4_UNSET;
      return true;

    case OPT_msse4a:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SSE4A_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4A_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SSE4A_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SSE4A_UNSET;
	}
      return true;

    case OPT_mfma4:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FMA4_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA4_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FMA4_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FMA4_UNSET;
	}
      return true;

   case OPT_mxop:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_XOP_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XOP_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_XOP_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_XOP_UNSET;
	}
      return true;

   case OPT_mlwp:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_LWP_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LWP_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_LWP_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LWP_UNSET;
	}
      return true;

    case OPT_mabm:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_ABM_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ABM_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_ABM_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_ABM_UNSET;
	}
      return true;

    case OPT_mbmi:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_BMI_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_BMI_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI_UNSET;
	}
      return true;

    case OPT_mbmi2:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_BMI2_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI2_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_BMI2_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_BMI2_UNSET;
	}
      return true;

    case OPT_mtbm:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_TBM_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_TBM_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_TBM_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_TBM_UNSET;
	}
      return true;

    case OPT_mpopcnt:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_POPCNT_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_POPCNT_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_POPCNT_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_POPCNT_UNSET;
	}
      return true;

    case OPT_msahf:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_SAHF_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SAHF_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_SAHF_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_SAHF_UNSET;
	}
      return true;

    case OPT_mcx16:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_CX16_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CX16_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_CX16_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CX16_UNSET;
	}
      return true;

    case OPT_mmovbe:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_MOVBE_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MOVBE_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MOVBE_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_MOVBE_UNSET;
	}
      return true;

    case OPT_mcrc32:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_CRC32_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CRC32_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_CRC32_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_CRC32_UNSET;
	}
      return true;

    case OPT_maes:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_AES_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AES_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_AES_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_AES_UNSET;
	}
      return true;

    case OPT_mpclmul:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_PCLMUL_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PCLMUL_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_PCLMUL_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_PCLMUL_UNSET;
	}
      return true;

    case OPT_mfsgsbase:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_FSGSBASE_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FSGSBASE_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_FSGSBASE_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_FSGSBASE_UNSET;
	}
      return true;

    case OPT_mrdrnd:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_RDRND_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDRND_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_RDRND_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_RDRND_UNSET;
	}
      return true;

    case OPT_mf16c:
      if (value)
	{
	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_F16C_SET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_F16C_SET;
	}
      else
	{
	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_F16C_UNSET;
	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_F16C_UNSET;
	}
      return true;

  /* Comes from final.c -- no real reason to change it.  */
#define MAX_CODE_ALIGN 16

    case OPT_malign_loops_:
      warning_at (loc, 0, "-malign-loops is obsolete, use -falign-loops");
      if (value > MAX_CODE_ALIGN)
	error_at (loc, "-malign-loops=%d is not between 0 and %d",
		  value, MAX_CODE_ALIGN);
      else
	opts->x_align_loops = 1 << value;
      return true;

    case OPT_malign_jumps_:
      warning_at (loc, 0, "-malign-jumps is obsolete, use -falign-jumps");
      if (value > MAX_CODE_ALIGN)
	error_at (loc, "-malign-jumps=%d is not between 0 and %d",
		  value, MAX_CODE_ALIGN);
      else
	opts->x_align_jumps = 1 << value;
      return true;

    case OPT_malign_functions_:
      warning_at (loc, 0,
		  "-malign-functions is obsolete, use -falign-functions");
      if (value > MAX_CODE_ALIGN)
	error_at (loc, "-malign-functions=%d is not between 0 and %d",
		  value, MAX_CODE_ALIGN);
      else
	opts->x_align_functions = 1 << value;
      return true;

    case OPT_mbranch_cost_:
      if (value > 5)
	{
	  error_at (loc, "-mbranch-cost=%d is not between 0 and 5", value);
	  opts->x_ix86_branch_cost = 5;
	}
      return true;

    default:
      return true;
    }
}

static const struct default_options ix86_option_optimization_table[] =
  {
    /* Enable redundant extension instructions removal at -O2 and higher.  */
    { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
    /* Turn off -fschedule-insns by default.  It tends to make the
       problem with not enough registers even worse.  */
    { OPT_LEVELS_ALL, OPT_fschedule_insns, NULL, 0 },

#ifdef SUBTARGET_OPTIMIZATION_OPTIONS
    SUBTARGET_OPTIMIZATION_OPTIONS,
#endif
    { OPT_LEVELS_NONE, 0, NULL, 0 }
  };

/* Implement TARGET_OPTION_INIT_STRUCT.  */

static void
ix86_option_init_struct (struct gcc_options *opts)
{
  if (TARGET_MACHO)
    /* The Darwin libraries never set errno, so we might as well
       avoid calling them when that's the only reason we would.  */
    opts->x_flag_errno_math = 0;

  opts->x_flag_pcc_struct_return = 2;
  opts->x_flag_asynchronous_unwind_tables = 2;
  opts->x_flag_vect_cost_model = 1;
}

/* On the x86 -fsplit-stack and -fstack-protector both use the same
   field in the TCB, so they can not be used together.  */

static bool
ix86_supports_split_stack (bool report ATTRIBUTE_UNUSED,
			   struct gcc_options *opts ATTRIBUTE_UNUSED)
{
  bool ret = true;

#ifndef TARGET_THREAD_SPLIT_STACK_OFFSET
  if (report)
    error ("%<-fsplit-stack%> currently only supported on GNU/Linux");
  ret = false;
#else
  if (!HAVE_GAS_CFI_PERSONALITY_DIRECTIVE)
    {
      if (report)
	error ("%<-fsplit-stack%> requires "
	       "assembler support for CFI directives");
      ret = false;
    }
#endif

  return ret;
}

#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS	\
  (TARGET_DEFAULT			\
   | TARGET_SUBTARGET_DEFAULT		\
   | TARGET_TLS_DIRECT_SEG_REFS_DEFAULT)

#undef TARGET_HANDLE_OPTION
#define TARGET_HANDLE_OPTION ix86_handle_option

#undef TARGET_OPTION_OPTIMIZATION_TABLE
#define TARGET_OPTION_OPTIMIZATION_TABLE ix86_option_optimization_table
#undef TARGET_OPTION_INIT_STRUCT
#define TARGET_OPTION_INIT_STRUCT ix86_option_init_struct

#undef TARGET_SUPPORTS_SPLIT_STACK
#define TARGET_SUPPORTS_SPLIT_STACK ix86_supports_split_stack

struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;