/*
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

        .file   "strchr.s"

#include "SYS.h"

        ENTRY(strchr)           /* (char *, char) */
.loop:
        movb    (%rdi),%dl      / %dl = byte of string
        cmpb    %sil,%dl        / find it?
        je      .found          / yes
        testb   %dl,%dl         / is it null?
        je      .notfound

        movb    1(%rdi),%dl     / %dl = byte of string
        cmpb    %sil,%dl        / find it?
        je      .found1         / yes
        testb   %dl,%dl         / is it null?
        je      .notfound

        movb    2(%rdi),%dl     / %dl = byte of string
        cmpb    %sil,%dl        / find it?
        je      .found2         / yes
        testb   %dl,%dl         / is it null?
        je      .notfound

        movb    3(%rdi),%dl     / %dl = byte of string
        cmpb    %sil,%dl        / find it?
        je      .found3         / yes
        addq    $4,%rdi
        testb   %dl,%dl         / is it null?
        jne     .loop

.notfound:
        xorl    %eax,%eax       / %rax = NULL
        ret

.found3:
        incq    %rdi
.found2:
        incq    %rdi
.found1:
        incq    %rdi
.found:
        movq    %rdi,%rax
        ret
        SET_SIZE(strchr)