1  /* Common definition for wmemset/wmemset_chk ifunc selections.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       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 <init-arch.h>
      20  
      21  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned) attribute_hidden;
      22  
      23  extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned) attribute_hidden;
      24  
      25  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
      26  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
      27    attribute_hidden;
      28  
      29  extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden;
      30  
      31  static inline void *
      32  IFUNC_SELECTOR (void)
      33  {
      34    const struct cpu_features *cpu_features = __get_cpu_features ();
      35  
      36    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      37        && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      38  				      AVX_Fast_Unaligned_Load, !))
      39      {
      40        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
      41  	{
      42  	  if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
      43  	    return OPTIMIZE (avx512_unaligned);
      44  
      45  	  return OPTIMIZE (evex_unaligned);
      46  	}
      47  
      48        if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
      49  	return OPTIMIZE (avx2_unaligned_rtm);
      50  
      51        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      52  				       Prefer_No_VZEROUPPER, !))
      53  	return OPTIMIZE (avx2_unaligned);
      54      }
      55  
      56    return OPTIMIZE (sse2_unaligned);
      57  }