sysdeps/i386/i686/multiarch/ifunc-memmove.h

   1 /* Common definition for memmove/memmove_chk ifunc selections.
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2017-2019 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library 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 GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <init-arch.h>
  21
  22 extern __typeof (REDIRECT_NAME) OPTIMIZE (ia32) attribute_hidden;
  23 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
  24   attribute_hidden;
  25 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
  26 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3_rep) attribute_hidden;
  27
  28 static inline void *
  29 IFUNC_SELECTOR (void)
  30 {
  31   const struct cpu_features* cpu_features = __get_cpu_features ();
  32
  33   if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load))
  34     return OPTIMIZE (sse2_unaligned);
  35
  36   if (CPU_FEATURES_CPU_P (cpu_features, SSSE3))
  37     {
  38       if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Rep_String))
  39         return OPTIMIZE (ssse3_rep);
  40
  41       return OPTIMIZE (ssse3);
  42     }
  43
  44   return OPTIMIZE (ia32);
  45 }