sysdeps/x86_64/dl-hwcaps-subdirs.c

   1 /* Architecture-specific glibc-hwcaps subdirectories.  x86 version.
   2    Copyright (C) 2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <dl-hwcaps.h>
  20 #include <cpu-features.h>
  21
  22 const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
  23 enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs.  */
  24
  25 uint32_t
  26 _dl_hwcaps_subdirs_active (void)
  27 {
  28   int active = 0;
  29
  30   /* Test in reverse preference order.  */
  31
  32   /* x86-64-v2.  */
  33   if (!(CPU_FEATURE_USABLE (CMPXCHG16B)
  34         && CPU_FEATURE_USABLE (LAHF64_SAHF64)
  35         && CPU_FEATURE_USABLE (POPCNT)
  36         && CPU_FEATURE_USABLE (SSE3)
  37         && CPU_FEATURE_USABLE (SSE4_1)
  38         && CPU_FEATURE_USABLE (SSE4_2)
  39         && CPU_FEATURE_USABLE (SSSE3)))
  40     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  41   ++active;
  42
  43   /* x86-64-v3.  */
  44   if (!(CPU_FEATURE_USABLE (AVX)
  45         && CPU_FEATURE_USABLE (AVX2)
  46         && CPU_FEATURE_USABLE (BMI1)
  47         && CPU_FEATURE_USABLE (BMI2)
  48         && CPU_FEATURE_USABLE (F16C)
  49         && CPU_FEATURE_USABLE (FMA)
  50         && CPU_FEATURE_USABLE (LZCNT)
  51         && CPU_FEATURE_USABLE (MOVBE)
  52         && CPU_FEATURE_USABLE (OSXSAVE)))
  53     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  54   ++active;
  55
  56  /* x86-64-v4.  */
  57   if (!(CPU_FEATURE_USABLE (AVX512F)
  58         && CPU_FEATURE_USABLE (AVX512BW)
  59         && CPU_FEATURE_USABLE (AVX512CD)
  60         && CPU_FEATURE_USABLE (AVX512DQ)
  61         && CPU_FEATURE_USABLE (AVX512VL)))
  62     return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  63   ++active;
  64
  65   return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
  66 }