1  /* Get x86 ISA level.
       2     This file is part of the GNU C Library.
       3     Copyright (C) 2020-2023 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, BMI1)
      51  	      && CPU_FEATURE_USABLE_P (cpu_features, BMI2)
      52  	      && CPU_FEATURE_USABLE_P (cpu_features, F16C)
      53  	      && CPU_FEATURE_USABLE_P (cpu_features, FMA)
      54  	      && CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
      55  	      && CPU_FEATURE_USABLE_P (cpu_features, MOVBE))
      56  	    {
      57  	      isa_level |= GNU_PROPERTY_X86_ISA_1_V3;
      58  	      if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
      59  		  && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
      60  		  && CPU_FEATURE_USABLE_P (cpu_features, AVX512CD)
      61  		  && CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
      62  		  && CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
      63  		isa_level |= GNU_PROPERTY_X86_ISA_1_V4;
      64  	    }
      65  	}
      66      }
      67  
      68    return isa_level;
      69  }