sysdeps/x86_64/memmove.S

   1 /* Optimized memmove for x86-64.
   2    Copyright (C) 2016-2021 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 <sysdep.h>
  20
  21 #define VEC_SIZE        16
  22 #define VEC(i)          xmm##i
  23 #define PREFETCHNT      prefetchnta
  24 #define VMOVNT          movntdq
  25 /* Use movups and movaps for smaller code sizes.  */
  26 #define VMOVU           movups
  27 #define VMOVA           movaps
  28 #define MOV_SIZE        3
  29 #define SECTION(p)              p
  30
  31 #ifdef USE_MULTIARCH
  32 # if !IS_IN (libc)
  33 #  define MEMCPY_SYMBOL(p,s)            memcpy
  34 # endif
  35 #else
  36 # if defined SHARED && IS_IN (libc)
  37 #  define MEMCPY_SYMBOL(p,s)            __memcpy
  38 # else
  39 #  define MEMCPY_SYMBOL(p,s)            memcpy
  40 # endif
  41 #endif
  42 #if !defined USE_MULTIARCH || !IS_IN (libc)
  43 # define MEMPCPY_SYMBOL(p,s)            __mempcpy
  44 #endif
  45 #ifndef MEMMOVE_SYMBOL
  46 # define MEMMOVE_CHK_SYMBOL(p,s)        p
  47 # define MEMMOVE_SYMBOL(p,s)            memmove
  48 #endif
  49
  50 #include "multiarch/memmove-vec-unaligned-erms.S"
  51
  52 #ifndef USE_MULTIARCH
  53 libc_hidden_builtin_def (memmove)
  54 # if defined SHARED && IS_IN (libc)
  55 strong_alias (memmove, __memcpy)
  56 libc_hidden_ver (memmove, memcpy)
  57 # endif
  58 libc_hidden_def (__mempcpy)
  59 weak_alias (__mempcpy, mempcpy)
  60 libc_hidden_builtin_def (mempcpy)
  61
  62 # if defined SHARED && IS_IN (libc)
  63 #  undef memcpy
  64 #  include <shlib-compat.h>
  65 versioned_symbol (libc, __memcpy, memcpy, GLIBC_2_14);
  66
  67 #  if SHLIB_COMPAT (libc, GLIBC_2_2_5, GLIBC_2_14)
  68 compat_symbol (libc, memmove, memcpy, GLIBC_2_2_5);
  69 #  endif
  70 # endif
  71 #endif