1  /* Common definition for ifunc selections optimized with SSE2 and AVX2.
       2     All versions must be listed in ifunc-impl-list.c.
       3     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <init-arch.h>
      21  
      22  #ifndef GENERIC
      23  # define GENERIC sse2
      24  #endif
      25  
      26  extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
      27  
      28  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
      29  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
      30  
      31  extern __typeof (REDIRECT_NAME) OPTIMIZE (GENERIC) attribute_hidden;
      32  
      33  static inline void *
      34  IFUNC_SELECTOR (void)
      35  {
      36    const struct cpu_features *cpu_features = __get_cpu_features ();
      37  
      38    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      39        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI1)
      40        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
      41        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
      42        && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      43  				      AVX_Fast_Unaligned_Load, ))
      44      {
      45        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
      46  	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
      47  	return OPTIMIZE (evex);
      48  
      49        if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
      50  	return OPTIMIZE (avx2_rtm);
      51  
      52        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      53  				       Prefer_No_VZEROUPPER, !))
      54  	return OPTIMIZE (avx2);
      55      }
      56  
      57    return OPTIMIZE (GENERIC);
      58  }