lshiftl.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%"
/ Shift a double long value.
#include "SYS.h"
.set arg,8
.set cnt,16
.set ans,0
ENTRY(lshiftl)
popl %eax
xchgl %eax,0(%esp)
pushl %eax
movl arg(%esp),%eax
movl arg+4(%esp),%edx
movl cnt(%esp),%ecx
orl %ecx,%ecx
jz .lshiftld
jns .lshiftlp
/ We are doing a negative (right) shift
negl %ecx
.lshiftln:
sarl $1,%edx
rcrl $1,%eax
loop .lshiftln
jmp .lshiftld
/ We are doing a positive (left) shift
.lshiftlp:
shll $1,%eax
rcll $1,%edx
loop .lshiftlp
/ We are done.
.lshiftld:
movl %eax,%ecx
popl %eax
movl %ecx,ans(%eax)
movl %edx,ans+4(%eax)
ret
SET_SIZE(lshiftl)