mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 12:41:05 +00:00
130 lines
2.9 KiB
ArmAsm
130 lines
2.9 KiB
ArmAsm
/* Highly optimized version for i586.
|
|
Copyright (C) 1997-2013 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include "asm-syntax.h"
|
|
|
|
/* BEWARE: `#ifdef memcpy' means that memcpy is redefined as `mempcpy',
|
|
and the return value is the byte after the last one copied in
|
|
the destination. */
|
|
#define MEMPCPY_P (defined memcpy)
|
|
|
|
#define PARMS 4+8 /* space for 2 saved regs */
|
|
#define RTN PARMS
|
|
#define DEST RTN
|
|
#define SRC DEST+4
|
|
#define LEN SRC+4
|
|
|
|
.text
|
|
#if defined PIC && !defined NOT_IN_libc
|
|
ENTRY (__memcpy_chk)
|
|
movl 12(%esp), %eax
|
|
cmpl %eax, 16(%esp)
|
|
jb HIDDEN_JUMPTARGET (__chk_fail)
|
|
END (__memcpy_chk)
|
|
#endif
|
|
ENTRY (memcpy)
|
|
|
|
pushl %edi
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %esi
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
movl DEST(%esp), %edi
|
|
cfi_rel_offset (edi, 4)
|
|
movl SRC(%esp), %esi
|
|
cfi_rel_offset (esi, 0)
|
|
movl LEN(%esp), %ecx
|
|
movl %edi, %eax
|
|
|
|
/* We need this in any case. */
|
|
cld
|
|
|
|
/* Cutoff for the big loop is a size of 32 bytes since otherwise
|
|
the loop will never be entered. */
|
|
cmpl $32, %ecx
|
|
jbe L(1)
|
|
|
|
negl %eax
|
|
andl $3, %eax
|
|
subl %eax, %ecx
|
|
xchgl %eax, %ecx
|
|
|
|
rep; movsb
|
|
|
|
movl %eax, %ecx
|
|
subl $32, %ecx
|
|
js L(2)
|
|
|
|
/* Read ahead to make sure we write in the cache since the stupid
|
|
i586 designers haven't implemented read-on-write-miss. */
|
|
movl (%edi), %eax
|
|
L(3): movl 28(%edi), %edx
|
|
|
|
/* Now correct the loop counter. Please note that in the following
|
|
code the flags are not changed anymore. */
|
|
subl $32, %ecx
|
|
|
|
movl (%esi), %eax
|
|
movl 4(%esi), %edx
|
|
movl %eax, (%edi)
|
|
movl %edx, 4(%edi)
|
|
movl 8(%esi), %eax
|
|
movl 12(%esi), %edx
|
|
movl %eax, 8(%edi)
|
|
movl %edx, 12(%edi)
|
|
movl 16(%esi), %eax
|
|
movl 20(%esi), %edx
|
|
movl %eax, 16(%edi)
|
|
movl %edx, 20(%edi)
|
|
movl 24(%esi), %eax
|
|
movl 28(%esi), %edx
|
|
movl %eax, 24(%edi)
|
|
movl %edx, 28(%edi)
|
|
|
|
leal 32(%esi), %esi
|
|
leal 32(%edi), %edi
|
|
|
|
jns L(3)
|
|
|
|
/* Correct extra loop counter modification. */
|
|
L(2): addl $32, %ecx
|
|
#if !MEMPCPY_P
|
|
movl DEST(%esp), %eax
|
|
#endif
|
|
|
|
L(1): rep; movsb
|
|
|
|
#if MEMPCPY_P
|
|
movl %edi, %eax
|
|
#endif
|
|
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
popl %edi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (edi)
|
|
|
|
ret
|
|
END (memcpy)
|
|
#if !MEMPCPY_P
|
|
libc_hidden_builtin_def (memcpy)
|
|
#endif
|