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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 	.file	"wslen.s"
     28 
     29 /*
     30  * Wide character wcslen() implementation
     31  *
     32  * size_t
     33  * wcslen(const wchar_t *s)
     34  *{
     35  *	const wchar_t *s0 = s + 1;
     36  *	while (*s++)
     37  *		;
     38  *	return (s - s0);
     39  *}
     40  */
     41 
     42 #include <sys/asm_linkage.h>
     43 
     44 	ANSI_PRAGMA_WEAK(wcslen,function)
     45 	ANSI_PRAGMA_WEAK(wslen,function)
     46 
     47 	ENTRY(wcslen)		/* (wchar_t *) */
     48 	xorl	%eax,%eax
     49 
     50 	.align	8
     51 .loop:
     52 	cmpl	$0,(%rdi)
     53 	je	.out0
     54 	cmpl	$0,4(%rdi)
     55 	je	.out1
     56 	cmpl	$0,8(%rdi)
     57 	je	.out2
     58 	cmpl	$0,12(%rdi)
     59 	je	.out3
     60 	addq	$4,%rax
     61 	addq	$16,%rdi
     62 	jmp	.loop
     63 
     64 	.align	4
     65 .out1:
     66 	incq	%rax
     67 .out0:
     68 	ret
     69 
     70 	.align	4
     71 .out2:
     72 	addq	$2,%rax
     73 	ret
     74 
     75 	.align	4
     76 .out3:
     77 	addq	$3, %rax
     78 	ret
     79 	SET_SIZE(wcslen)
     80 
     81 	ENTRY(wslen)
     82 	jmp	wcslen		/ tail call into wcslen
     83 	SET_SIZE(wslen)
     84