sysdeps/aarch64/multiarch/memchr.c

   1 /* Multiple versions of memchr. AARCH64 version.
   2    Copyright (C) 2018 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 /* Define multiple versions only for the definition in libc.  */
  20
  21 #if IS_IN (libc)
  22 /* Redefine memchr so that the compiler won't complain about the type
  23    mismatch with the IFUNC selector in strong_alias, below.  */
  24 # undef memchr
  25 # define memchr __redirect_memchr
  26 # include <string.h>
  27 # include <init-arch.h>
  28
  29 extern __typeof (__redirect_memchr) __memchr;
  30
  31 extern __typeof (__redirect_memchr) __memchr_generic attribute_hidden;
  32 extern __typeof (__redirect_memchr) __memchr_nosimd attribute_hidden;
  33
  34 libc_ifunc (__memchr,
  35             ((IS_EMAG (midr)
  36                ? __memchr_nosimd
  37                : __memchr_generic)));
  38
  39 # undef memchr
  40 strong_alias (__memchr, memchr);
  41 #endif