1  /* Common definition for ifunc selections optimized wide-character
       2     string copy functions.
       3  
       4     All versions must be listed in ifunc-impl-list.c.
       5     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       6     This file is part of the GNU C Library.
       7  
       8     The GNU C Library is free software; you can redistribute it and/or
       9     modify it under the terms of the GNU Lesser General Public
      10     License as published by the Free Software Foundation; either
      11     version 2.1 of the License, or (at your option) any later version.
      12  
      13     The GNU C Library is distributed in the hope that it will be useful,
      14     but WITHOUT ANY WARRANTY; without even the implied warranty of
      15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16     Lesser General Public License for more details.
      17  
      18     You should have received a copy of the GNU Lesser General Public
      19     License along with the GNU C Library; if not, see
      20     <https://www.gnu.org/licenses/>.  */
      21  
      22  #include <init-arch.h>
      23  
      24  #ifndef GENERIC
      25  # define GENERIC generic
      26  #endif
      27  
      28  extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
      29  
      30  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
      31  
      32  extern __typeof (REDIRECT_NAME) OPTIMIZE (GENERIC) attribute_hidden;
      33  
      34  static inline void *
      35  IFUNC_SELECTOR (void)
      36  {
      37    const struct cpu_features *cpu_features = __get_cpu_features ();
      38  
      39    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      40        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
      41        && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      42  				      AVX_Fast_Unaligned_Load, ))
      43      {
      44        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
      45  	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
      46  	return OPTIMIZE (evex);
      47  
      48        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      49  				       Prefer_No_VZEROUPPER, !))
      50  	return OPTIMIZE (avx2);
      51  
      52      }
      53  
      54    return OPTIMIZE (GENERIC);
      55  }