sysdeps/x86_64/multiarch/memmove.c

   1 /* Multiple versions of memmove.
   2    All versions must be listed in ifunc-impl-list.c.
   3    Copyright (C) 2010-2015 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #if IS_IN (libc)
  21 # define MEMMOVE __memmove_sse2
  22 # ifdef SHARED
  23 #  undef libc_hidden_builtin_def
  24 #  define libc_hidden_builtin_def(name) \
  25   __hidden_ver1 (__memmove_sse2, __GI_memmove, __memmove_sse2);
  26 # endif
  27
  28 /* Redefine memmove so that the compiler won't complain about the type
  29    mismatch with the IFUNC selector in strong_alias, below.  */
  30 # undef memmove
  31 # define memmove __redirect_memmove
  32 # include <string.h>
  33 # undef memmove
  34
  35 extern __typeof (__redirect_memmove) __memmove_sse2 attribute_hidden;
  36 extern __typeof (__redirect_memmove) __memmove_ssse3 attribute_hidden;
  37 extern __typeof (__redirect_memmove) __memmove_ssse3_back attribute_hidden;
  38 extern __typeof (__redirect_memmove) __memmove_avx_unaligned attribute_hidden;
  39
  40 #endif
  41
  42 #include "string/memmove.c"
  43
  44 #if IS_IN (libc)
  45 # include <shlib-compat.h>
  46 # include "init-arch.h"
  47
  48 /* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
  49    ifunc symbol properly.  */
  50 extern __typeof (__redirect_memmove) __libc_memmove;
  51 libc_ifunc (__libc_memmove,
  52             HAS_AVX
  53             ? __memmove_avx_unaligned
  54             : (HAS_SSSE3
  55                ? (HAS_FAST_COPY_BACKWARD
  56                   ? __memmove_ssse3_back : __memmove_ssse3)
  57                : __memmove_sse2));
  58
  59 strong_alias (__libc_memmove, memmove)
  60
  61 # if SHLIB_COMPAT (libc, GLIBC_2_2_5, GLIBC_2_14)
  62 compat_symbol (libc, memmove, memcpy, GLIBC_2_2_5);
  63 # endif
  64 #endif