wslen.s revision 9a70fc3be3b1e966bf78825cdb8d509963a6f0a1
/*
* 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)