sysdeps/x86/get-isa-level.h

   1 /* Get x86 ISA level.
   2    This file is part of the GNU C Library.
   3    Copyright (C) 2020 Free Software Foundation, Inc.
   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 <elf.h>
  20 #include <cpu-features.h>
  21
  22 /* Get GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
  23    ISA level.  */
  24
  25 static unsigned int
  26 get_isa_level (const struct cpu_features *cpu_features)
  27 {
  28   unsigned int isa_level = 0;
  29
  30   if (CPU_FEATURE_USABLE_P (cpu_features, CMOV)
  31       && CPU_FEATURE_USABLE_P (cpu_features, CX8)
  32       && CPU_FEATURE_CPU_P (cpu_features, FPU)
  33       && CPU_FEATURE_USABLE_P (cpu_features, FXSR)
  34       && CPU_FEATURE_USABLE_P (cpu_features, MMX)
  35       && CPU_FEATURE_USABLE_P (cpu_features, SSE)
  36       && CPU_FEATURE_USABLE_P (cpu_features, SSE2))
  37     {
  38       isa_level = GNU_PROPERTY_X86_ISA_1_BASELINE;
  39       if (CPU_FEATURE_USABLE_P (cpu_features, CMPXCHG16B)
  40           && CPU_FEATURE_USABLE_P (cpu_features, LAHF64_SAHF64)
  41           && CPU_FEATURE_USABLE_P (cpu_features, POPCNT)
  42           && CPU_FEATURE_USABLE_P (cpu_features, SSE3)
  43           && CPU_FEATURE_USABLE_P (cpu_features, SSSE3)
  44           && CPU_FEATURE_USABLE_P (cpu_features, SSE4_1)
  45           && CPU_FEATURE_USABLE_P (cpu_features, SSE4_2))
  46         {
  47           isa_level |= GNU_PROPERTY_X86_ISA_1_V2;
  48           if (CPU_FEATURE_USABLE_P (cpu_features, AVX)
  49               && CPU_FEATURE_USABLE_P (cpu_features, AVX2)
  50               && CPU_FEATURE_USABLE_P (cpu_features, F16C)
  51               && CPU_FEATURE_USABLE_P (cpu_features, FMA)
  52               && CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
  53               && CPU_FEATURE_USABLE_P (cpu_features, MOVBE))
  54             {
  55               isa_level |= GNU_PROPERTY_X86_ISA_1_V3;
  56               if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
  57                   && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
  58                   && CPU_FEATURE_USABLE_P (cpu_features, AVX512CD)
  59                   && CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
  60                   && CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
  61                 isa_level |= GNU_PROPERTY_X86_ISA_1_V4;
  62             }
  63         }
  64     }
  65
  66   return isa_level;
  67 }