/*
 * 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   "wschr.s"

/
/ Wide character wcschr() implementation
/
/ Algorithm based on Solaris 2.6 gen/strchr.s implementation
/

#include <sys/asm_linkage.h>

        ANSI_PRAGMA_WEAK(wcschr,function)
        ANSI_PRAGMA_WEAK(wschr,function)

        .align  8               / accounts for .loop alignment and prolog

        ENTRY(wcschr)           /* (wchar_t *s, wchar_t wc) */
        movq    %rdi,%rax
.loop:
        movl    (%rax),%edx     / %edx = wchar of string
        cmpl    %esi,%edx       / find it?
        je      .found          / yes
        testl   %edx,%edx       / is it null?
        je      .notfound

        movl    4(%rax),%edx    / %edx = wchar of string
        cmpl    %esi,%edx       / find it?
        je      .found1         / yes
        testl   %edx,%edx       / is it null?
        je      .notfound

        movl    8(%rax),%edx    / %edx = wchar of string
        cmpl    %esi,%edx       / find it?
        je      .found2         / yes
        testl   %edx,%edx       / is it null?
        je      .notfound

        movl    12(%rax),%edx   / %edx = wchar of string
        cmpl    %esi,%edx       / find it?
        je      .found3         / yes
        addq    $16,%rax
        testl   %edx,%edx       / is it null?
        jne     .loop

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

.found3:
        addq    $12,%rax
        ret
.found2:
        addq    $8,%rax
        ret
.found1:
        addq    $4,%rax
.found:
        ret
        SET_SIZE(wcschr)

        ENTRY(wschr)
        jmp     wcschr          / tail call into wcschr
        SET_SIZE(wschr)