1  /* Common definition for __memcmpeq ifunc selections.
       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  extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex) attribute_hidden;
      23  
      24  extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2) attribute_hidden;
      25  extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_rtm) attribute_hidden;
      26  
      27  extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2) attribute_hidden;
      28  
      29  static inline void *
      30  IFUNC_SELECTOR (void)
      31  {
      32    const struct cpu_features *cpu_features = __get_cpu_features ();
      33  
      34    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      35        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
      36        && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      37  				      AVX_Fast_Unaligned_Load, ))
      38      {
      39        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
      40  	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
      41  	return OPTIMIZE1 (evex);
      42  
      43        if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
      44  	return OPTIMIZE1 (avx2_rtm);
      45  
      46        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      47  				       Prefer_No_VZEROUPPER, !))
      48  	return OPTIMIZE1 (avx2);
      49      }
      50  
      51    return OPTIMIZE1 (sse2);
      52  }