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Diffstat (limited to 'sysdeps/i386/i686/memcpy.S')
| -rw-r--r-- | sysdeps/i386/i686/memcpy.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/memcpy.S b/sysdeps/i386/i686/memcpy.S new file mode 100644 index 0000000000..eab6855d57 --- /dev/null +++ b/sysdeps/i386/i686/memcpy.S @@ -0,0 +1,51 @@ +/* Copy memory block and return pointer to beginning of destination block + For Intel 80x86, x>=6. + This file is part of the GNU C Library. + Copyright (C) 1999 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> +#include "asm-syntax.h" + +/* memcpy: + INPUT PARAMETER: + dest (sp + 4) + src (sp + 8) + len (sp + 12) +*/ + +ENTRY(memcpy) + movl 12(%esp), %ecx + movl %edi, %eax + movl 4(%esp), %edi + movl %esi, %edx + movl 8(%esp), %esi + cld + shrl $1, %ecx + jnc 1f + movsb +1: shrl $1, %ecx + jnc 2f + movsw +2: rep + movsl + movl %eax, %edi + movl %edx, %esi + movl 4(%esp), %eax + ret +END(memcpy) |