/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

        .file   "memset.s"

#include <sys/asm_linkage.h>

        ANSI_PRAGMA_WEAK(memset,function)

#include "SYS.h"

        ENTRY(memset)
        pushl   %edi            / save register variable
        movl    8(%esp),%edi    / %edi = string address
        movl    12(%esp),%eax   / %al = byte to duplicate
        movl    16(%esp),%ecx   / %ecx = number of copies
        cmpl    $20,%ecx        / strings with 20 or more chars should
        jbe     .byteset        / byteset one word at a time
.wordset:
        andl    $0xff,%eax      / Duplicate fill const 4 times in %eax
        shrl    $2,%ecx         / %ecx = number of words to set
        movl    %eax,%edx
        shll    $8,%eax         / This is ugly, but no P6 partial stalls
        orl     %edx,%eax       / get introduced as before
        shll    $8,%eax
        orl     %edx,%eax
        shll    $8,%eax
        orl     %edx,%eax
        rep; sstol
        movl    16(%esp),%ecx
        andl    $3,%ecx         / %ecx = number of bytes left
.byteset:
        rep; sstob
        movl    8(%esp),%eax    / return string address
        popl    %edi            / restore register variable
        ret
        SET_SIZE(memset)