1/* Copy memory block and return pointer to following byte.
2   For Intel 80x86, x>=6.
3   This file is part of the GNU C Library.
4   Copyright (C) 1998-2022 Free Software Foundation, Inc.
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   <https://www.gnu.org/licenses/>.  */
19
20#include <sysdep.h>
21#include "asm-syntax.h"
22
23#define PARMS	4		/* no space for saved regs */
24#define RTN	PARMS
25#define DEST	RTN
26#define SRC	DEST+4
27#define LEN	SRC+4
28
29	.text
30#if defined PIC && IS_IN (libc)
31ENTRY_CHK (__mempcpy_chk)
32	movl	12(%esp), %eax
33	cmpl	%eax, 16(%esp)
34	jb	HIDDEN_JUMPTARGET (__chk_fail)
35END_CHK (__mempcpy_chk)
36#endif
37ENTRY (__mempcpy)
38
39	movl	LEN(%esp), %ecx
40	movl	%edi, %eax
41	cfi_register (edi, eax)
42	movl	DEST(%esp), %edi
43	movl	%esi, %edx
44	cfi_register (esi, edx)
45	movl	SRC(%esp), %esi
46	cld
47	shrl	$1, %ecx
48	jnc	1f
49	movsb
501:	shrl	$1, %ecx
51	jnc	2f
52	movsw
532:	rep
54	movsl
55	xchgl	%edi, %eax
56	cfi_restore (edi)
57	movl	%edx, %esi
58	cfi_restore (esi)
59
60	ret
61END (__mempcpy)
62libc_hidden_def (__mempcpy)
63weak_alias (__mempcpy, mempcpy)
64libc_hidden_builtin_def (mempcpy)
65