wschr.s revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
/
/ 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)