/* strcpy/stpcpy implementation for i586.

   Copyright (C) 1997-2018 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"

#define PARMS	4+12	/* space for 3 saved regs */

#define RTN	PARMS

#define DEST	RTN

#define SRC	DEST+4

#ifndef USE_AS_STPCPY

# define STRCPY strcpy

#endif

#define magic 0xfefefeff

	.text

ENTRY (STRCPY)

	pushl	%edi

	cfi_adjust_cfa_offset (4)

	pushl	%esi

	cfi_adjust_cfa_offset (4)

	pushl	%ebx

	cfi_adjust_cfa_offset (4)

	movl	DEST(%esp), %edi

	cfi_rel_offset (edi, 8)

	movl	SRC(%esp), %esi

	cfi_rel_offset (esi, 4)

	xorl	%eax, %eax

	leal	-1(%esi), %ecx

	movl	$magic, %ebx

	cfi_rel_offset (ebx, 0)

	andl	$3, %ecx

	cmpb	$2, %cl

	je	L(Src2)

	ja	L(Src3)

	cmpb	$1, %cl

	je	L(Src1)

L(Src0):

	orb	(%esi), %al

	jz	L(end)

	stosb

	xorl	%eax, %eax

	incl	%esi

L(Src1):

	orb	(%esi), %al

	jz	L(end)

	stosb

	xorl	%eax, %eax

	incl	%esi

L(Src2):

	orb	(%esi), %al

	jz	L(end)

	stosb

	xorl	%eax, %eax

	incl	%esi

L(Src3):

	movl	(%esi), %ecx

	leal	4(%esi),%esi

	subl	%ecx, %eax

	addl	%ebx, %ecx

	decl	%eax

	jnc	L(3)

	movl	%ecx, %edx

	xorl	%ecx, %eax

	subl	%ebx, %edx

	andl	$~magic, %eax

	jne	L(4)

	movl	%edx, (%edi)

	leal	4(%edi),%edi

	jmp	L(Src3)

L(3):	movl	%ecx, %edx

	subl	%ebx, %edx

L(4):	movb	%dl, (%edi)

	testb	%dl, %dl

	movl	%edx, %eax

	jz	L(end2)

	shrl	$16, %eax

	movb	%dh, 1(%edi)

#ifdef USE_AS_STPCPY

	addl	$1, %edi

#endif

	cmpb	$0, %dh

	jz	L(end2)

#ifdef USE_AS_STPCPY

	movb	%al, 1(%edi)

	addl	$1, %edi

	cmpb	$0, %al

	jz	L(end2)

	addl	$1, %edi

#else

	movb	%al, 2(%edi)

	testb	%al, %al

	leal	3(%edi), %edi

	jz	L(end2)

#endif

L(end):	movb	%ah, (%edi)

L(end2):

#ifdef USE_AS_STPCPY

	movl	%edi, %eax

#else

	movl	DEST(%esp), %eax

#endif

	popl	%ebx

	cfi_adjust_cfa_offset (-4)

	cfi_restore (ebx)

	popl	%esi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (esi)

	popl	%edi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (edi)

	ret

END (STRCPY)

#ifndef USE_AS_STPCPY

libc_hidden_builtin_def (strcpy)

#endif