glibc/sysdeps/x86_64/dl-hwcaps-subdirs.c

/* Architecture-specific glibc-hwcaps subdirectories.  x86 version.
   Copyright (C) 2020-2021 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 <dl-hwcaps.h>
#include <cpu-features.h>

const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs.  */

uint32_t
_dl_hwcaps_subdirs_active (void)
{
  int active = 0;

  /* Test in reverse preference order.  */

  /* x86-64-v2.  */
  if (!(CPU_FEATURE_USABLE (CMPXCHG16B)
        && CPU_FEATURE_USABLE (LAHF64_SAHF64)
        && CPU_FEATURE_USABLE (POPCNT)
        && CPU_FEATURE_USABLE (SSE3)
        && CPU_FEATURE_USABLE (SSE4_1)
        && CPU_FEATURE_USABLE (SSE4_2)
        && CPU_FEATURE_USABLE (SSSE3)))
    return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  ++active;

  /* x86-64-v3.  */
  if (!(CPU_FEATURE_USABLE (AVX)
        && CPU_FEATURE_USABLE (AVX2)
        && CPU_FEATURE_USABLE (BMI1)
        && CPU_FEATURE_USABLE (BMI2)
        && CPU_FEATURE_USABLE (F16C)
        && CPU_FEATURE_USABLE (FMA)
        && CPU_FEATURE_USABLE (LZCNT)
        && CPU_FEATURE_USABLE (MOVBE)
        && CPU_FEATURE_USABLE (OSXSAVE)))
    return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  ++active;

 /* x86-64-v4.  */
  if (!(CPU_FEATURE_USABLE (AVX512F)
        && CPU_FEATURE_USABLE (AVX512BW)
        && CPU_FEATURE_USABLE (AVX512CD)
        && CPU_FEATURE_USABLE (AVX512DQ)
        && CPU_FEATURE_USABLE (AVX512VL)))
    return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  ++active;

  return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
}