/* memset/bzero -- set memory area to CH/0

   Highly optimized version for ix86, x>=6.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 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+4	/* space for 1 saved reg */

#ifdef USE_AS_BZERO

# define DEST	PARMS

# define LEN	DEST+4

#else

# define RTN	PARMS

# define DEST	RTN

# define CHR	DEST+4

# define LEN	CHR+4

#endif

        .text

#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO

ENTRY_CHK (__memset_chk)

	movl	12(%esp), %eax

	cmpl	%eax, 16(%esp)

	jb	HIDDEN_JUMPTARGET (__chk_fail)

END_CHK (__memset_chk)

#endif

ENTRY (memset)

	cld

	pushl	%edi

	cfi_adjust_cfa_offset (4)

	movl	DEST(%esp), %edx

	movl	LEN(%esp), %ecx

#ifdef USE_AS_BZERO

	xorl	%eax, %eax	/* fill with 0 */

#else

	movzbl	CHR(%esp), %eax

#endif

	jecxz	1f

	movl	%edx, %edi

	cfi_rel_offset (edi, 0)

	andl	$3, %edx

	jz	2f	/* aligned */

	jp	3f	/* misaligned at 3, store just one byte below */

	stosb		/* misaligned at 1 or 2, store two bytes */

	decl	%ecx

	jz	1f

3:	stosb

	decl	%ecx

	jz	1f

	xorl	$1, %edx

	jnz	2f	/* was misaligned at 2 or 3, now aligned */

	stosb		/* was misaligned at 1, store third byte */

	decl	%ecx

2:	movl	%ecx, %edx

	shrl	$2, %ecx

	andl	$3, %edx

#ifndef USE_AS_BZERO

	imul	$0x01010101, %eax

#endif

	rep

	stosl

	movl	%edx, %ecx

	rep

	stosb

1:

#ifndef USE_AS_BZERO

	movl DEST(%esp), %eax	/* start address of destination is result */

#endif

	popl	%edi

	cfi_adjust_cfa_offset (-4)

	cfi_restore (edi)

	ret

END (memset)

libc_hidden_builtin_def (memset)