1  /* Common definition for ifunc selections optimized with SSE2, unaligned
       2     SSE2 and SSSE3.
       3     All versions must be listed in ifunc-impl-list.c.
       4     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       5     This file is part of the GNU C Library.
       6  
       7     The GNU C Library is free software; you can redistribute it and/or
       8     modify it under the terms of the GNU Lesser General Public
       9     License as published by the Free Software Foundation; either
      10     version 2.1 of the License, or (at your option) any later version.
      11  
      12     The GNU C Library is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15     Lesser General Public License for more details.
      16  
      17     You should have received a copy of the GNU Lesser General Public
      18     License along with the GNU C Library; if not, see
      19     <https://www.gnu.org/licenses/>.  */
      20  
      21  #include <init-arch.h>
      22  
      23  extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
      24  
      25  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
      26  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
      27  
      28  extern __typeof (REDIRECT_NAME)
      29      OPTIMIZE (sse2_unaligned) attribute_hidden;
      30  
      31  extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) 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_FEATURES_ARCH_P (cpu_features,
      40  				      AVX_Fast_Unaligned_Load, ))
      41      {
      42        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
      43  	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
      44  	return OPTIMIZE (evex);
      45  
      46        if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
      47  	return OPTIMIZE (avx2_rtm);
      48  
      49        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
      50  				       Prefer_No_VZEROUPPER, !))
      51  	return OPTIMIZE (avx2);
      52      }
      53  
      54    if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load, ))
      55      return OPTIMIZE (sse2_unaligned);
      56  
      57    return OPTIMIZE (sse2);
      58  }