sysdeps/x86_64/multiarch/wcscpy.c

   1 /* Multiple versions of wcscpy.
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2017-2024 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 /* Define multiple versions only for the definition in libc.  */
  21 #if IS_IN (libc)
  22 # define __wcscpy __redirect_wcscpy
  23 # include <wchar.h>
  24 # undef __wcscpy
  25
  26 # define SYMBOL_NAME wcscpy
  27 # include <init-arch.h>
  28
  29 extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
  30
  31 extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
  32
  33 extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
  34
  35 extern __typeof (REDIRECT_NAME) OPTIMIZE (generic) attribute_hidden;
  36
  37 static inline void *
  38 IFUNC_SELECTOR (void)
  39 {
  40   const struct cpu_features* cpu_features = __get_cpu_features ();
  41
  42   if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
  43       && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
  44       && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load, ))
  45     {
  46       if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
  47           && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
  48         return OPTIMIZE (evex);
  49
  50       if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER, !))
  51         return OPTIMIZE (avx2);
  52     }
  53
  54   if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
  55     return OPTIMIZE (ssse3);
  56
  57   return OPTIMIZE (generic);
  58 }
  59
  60 libc_ifunc_redirected (__redirect_wcscpy, __wcscpy, IFUNC_SELECTOR ());
  61 weak_alias (__wcscpy, wcscpy)
  62 # ifdef SHARED
  63 __hidden_ver1 (__wcscpy, __GI___wcscpy, __redirect_wcscpy)
  64   __attribute__((visibility ("hidden"))) __attribute_copy__ (wcscpy);
  65 # endif
  66 #endif