sysdeps/x86_64/memmove.S

   1 /* Optimized memmove for x86-64.
   2    Copyright (C) 2016-2022 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
  20 #ifdef USE_MULTIARCH
  21 # if !IS_IN (libc)
  22 #  define MEMCPY_SYMBOL(p,s)            memcpy
  23 # endif
  24 #else
  25 # if defined SHARED && IS_IN (libc)
  26 #  define MEMCPY_SYMBOL(p,s)            __memcpy
  27 # else
  28 #  define MEMCPY_SYMBOL(p,s)            memcpy
  29 # endif
  30 #endif
  31 #if !defined USE_MULTIARCH || !IS_IN (libc)
  32 # define MEMPCPY_SYMBOL(p,s)            __mempcpy
  33 #endif
  34
  35 #define MEMMOVE_CHK_SYMBOL(p,s) p
  36 #define MEMMOVE_SYMBOL(p,s)     memmove
  37
  38
  39 #define DEFAULT_IMPL_V1 "multiarch/memmove-sse2-unaligned-erms.S"
  40 #define DEFAULT_IMPL_V3 "multiarch/memmove-avx-unaligned-erms.S"
  41 #define DEFAULT_IMPL_V4 "multiarch/memmove-evex-unaligned-erms.S"
  42
  43 #include "isa-default-impl.h"
  44
  45 weak_alias (__mempcpy, mempcpy)
  46
  47 #ifndef USE_MULTIARCH
  48 libc_hidden_builtin_def (memmove)
  49 # if defined SHARED && IS_IN (libc)
  50 strong_alias (memmove, __memcpy)
  51 libc_hidden_ver (memmove, memcpy)
  52 # endif
  53 libc_hidden_def (__mempcpy)
  54 weak_alias (__mempcpy, mempcpy)
  55 libc_hidden_builtin_def (mempcpy)
  56
  57
  58 # if defined SHARED && IS_IN (libc)
  59 #  undef memcpy
  60 #  include <shlib-compat.h>
  61 versioned_symbol (libc, __memcpy, memcpy, GLIBC_2_14);
  62 # endif
  63 #endif