muldiv.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.ident "%Z%%M% %I% %E% SMI"
.file "muldiv.s"
#include <SYS.h>
ENTRY(.udiv)
wr %g0, %g0, %y
nop
nop
mov %o0, %o3 ! o3 gets remainder
udiv %o0, %o1, %o0 ! o0 contains quotient a/b
umul %o0, %o1, %o4 ! o4 contains q*b
retl
sub %o3, %o4, %o3 ! o3 gets a-q*b
SET_SIZE(.udiv)
ENTRY(.div)
sra %o0,31,%o4 ! extend sign
wr %o4,%g0,%y
cmp %o1,0xffffffff ! is divisor -1?
be,a 1f ! if yes
subcc %g0,%o0,%o0 ! simply negate dividend
mov %o0,%o3 ! o3 gets remainder
sdiv %o0,%o1,%o0 ! o0 contains quotient a/b
smul %o0,%o1,%o4 ! o4 contains q*b
retl
sub %o3,%o4,%o3 ! o3 gets a-q*b
1:
retl
mov %g0,%o3 ! remainder is 0
SET_SIZE(.div)