sysdeps/x86_64/memcmp-isa-default-impl.h

   1 /* Set default memcmp impl based on ISA level.
   2    Copyright (C) 2022-2023 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 <isa-level.h>
  20 #if MINIMUM_X86_ISA_LEVEL == 1 || MINIMUM_X86_ISA_LEVEL == 2
  21 # define DEFAULT_MEMCMP __memcmp_sse2
  22 #elif MINIMUM_X86_ISA_LEVEL == 3
  23 # define DEFAULT_MEMCMP __memcmp_avx2_movbe
  24 #elif MINIMUM_X86_ISA_LEVEL == 4
  25 # define DEFAULT_MEMCMP __memcmp_evex_movbe
  26 #else
  27 # error "Unknown default memcmp implementation"
  28 #endif