/*
 * 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   "wslen.s"

/*
 * Wide character wcslen() implementation
 *
 * size_t
 * wcslen(const wchar_t *s)
 *{
 *      const wchar_t *s0 = s + 1;
 *      while (*s++)
 *              ;
 *      return (s - s0);
 *}
 */

#include <sys/asm_linkage.h>

        ANSI_PRAGMA_WEAK(wcslen,function)
        ANSI_PRAGMA_WEAK(wslen,function)

        ENTRY(wcslen)           /* (wchar_t *) */
        xorl    %eax,%eax

        .align  8
.loop:
        cmpl    $0,(%rdi)
        je      .out0
        cmpl    $0,4(%rdi)
        je      .out1
        cmpl    $0,8(%rdi)
        je      .out2
        cmpl    $0,12(%rdi)
        je      .out3
        addq    $4,%rax
        addq    $16,%rdi
        jmp     .loop

        .align  4
.out1:
        incq    %rax
.out0:
        ret

        .align  4
.out2:
        addq    $2,%rax
        ret

        .align  4
.out3:
        addq    $3, %rax
        ret
        SET_SIZE(wcslen)

        ENTRY(wslen)
        jmp     wcslen          / tail call into wcslen
        SET_SIZE(wslen)