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[thirdparty/glibc.git] / sysdeps / x86_64 / multiarch / ifunc-memcmp.h

/* Common definition for memcmp/wmemcmp ifunc selections.
   All versions must be listed in ifunc-impl-list.c.
   Copyright (C) 2017-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

# include <init-arch.h>

extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_movbe) attribute_hidden;

static inline void *
IFUNC_SELECTOR (void)
{
  const struct cpu_features* cpu_features = __get_cpu_features ();

  if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
      && CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      && CPU_FEATURE_USABLE_P (cpu_features, MOVBE)
      && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
    return OPTIMIZE (avx2_movbe);

  if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
    return OPTIMIZE (sse4_1);

  if (CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
    return OPTIMIZE (ssse3);

  return OPTIMIZE (sse2);
}