sysdeps/s390/memmem.c

   1 /* Multiple versions of memmem.
   2    Copyright (C) 2018-2022 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 <ifunc-memmem.h>
  20
  21 #if HAVE_MEMMEM_IFUNC
  22 # define memmem __redirect_memmem
  23 # define __memmem __redirect___memmem
  24 # include <string.h>
  25 # include <ifunc-resolve.h>
  26 # undef memmem
  27 # undef __memmem
  28
  29 # if HAVE_MEMMEM_C
  30 extern __typeof (__redirect_memmem) MEMMEM_C attribute_hidden;
  31 # endif
  32
  33 # if HAVE_MEMMEM_Z13
  34 extern __typeof (__redirect_memmem) MEMMEM_Z13 attribute_hidden;
  35 # endif
  36
  37 # if HAVE_MEMMEM_ARCH13
  38 extern __typeof (__redirect_memmem) MEMMEM_ARCH13 attribute_hidden;
  39 # endif
  40
  41 s390_libc_ifunc_expr (__redirect_memmem, __memmem,
  42                       (HAVE_MEMMEM_ARCH13 && (hwcap & HWCAP_S390_VXRS_EXT2))
  43                       ? MEMMEM_ARCH13
  44                       : (HAVE_MEMMEM_Z13 && (hwcap & HWCAP_S390_VX))
  45                       ? MEMMEM_Z13
  46                       : MEMMEM_DEFAULT
  47                       )
  48 weak_alias (__memmem, memmem)
  49 #endif