sysdeps/x86/init-arch.h

   1 /* This file is part of the GNU C Library.
   2    Copyright (C) 2008-2018 Free Software Foundation, Inc.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef  __ASSEMBLER__
  19 # include <cpu-features.h>
  20 #else
  21 # include <ldsodefs.h>
  22 #endif
  23 #include <ifunc-init.h>
  24
  25 #ifndef __x86_64__
  26 /* Due to the reordering and the other nifty extensions in i686, it is
  27    not really good to use heavily i586 optimized code on an i686.  It's
  28    better to use i486 code if it isn't an i586.  */
  29 # if MINIMUM_ISA == 686
  30 #  define USE_I586 0
  31 #  define USE_I686 1
  32 # else
  33 #  define USE_I586 (HAS_ARCH_FEATURE (I586) && !HAS_ARCH_FEATURE (I686))
  34 #  define USE_I686 HAS_ARCH_FEATURE (I686)
  35 # endif
  36 #endif