sysdeps/x86_64/multiarch/ifunc-strcasecmp.h

   1 /* Common definition for strcasecmp famly ifunc selections.
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2017-2018 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <init-arch.h>
  21
  22 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
  23 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
  24 extern __typeof (REDIRECT_NAME) OPTIMIZE (sse42) attribute_hidden;
  25 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx) attribute_hidden;
  26
  27 static inline void *
  28 IFUNC_SELECTOR (void)
  29 {
  30   const struct cpu_features* cpu_features = __get_cpu_features ();
  31
  32   if (CPU_FEATURES_ARCH_P (cpu_features, AVX_Usable))
  33     return OPTIMIZE (avx);
  34
  35   if (CPU_FEATURES_CPU_P (cpu_features, SSE4_2)
  36       && !CPU_FEATURES_ARCH_P (cpu_features, Slow_SSE4_2))
  37     return OPTIMIZE (sse42);
  38
  39   if (CPU_FEATURES_CPU_P (cpu_features, SSSE3))
  40     return OPTIMIZE (ssse3);
  41
  42   return OPTIMIZE (sse2);
  43 }