hwmuldiv.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 (c) 1994-2000 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
.file "%M%"
#include <sys/asm_linkage.h>
/*
* Versions of .mul .umul .div .udiv .rem .urem written using
* appropriate SPARC V8 instructions.
*/
ENTRY(.mul)
smul %o0, %o1, %o0
rd %y, %o1
sra %o0, 31, %o2
retl
cmp %o1, %o2 ! return with Z set if %y == (%o0 >> 31)
SET_SIZE(.mul)
ENTRY(.umul)
umul %o0, %o1, %o0
rd %y, %o1
retl
tst %o1 ! return with Z set if high order bits are zero
SET_SIZE(.umul)
ENTRY(.div)
sra %o0, 31, %o2
wr %g0, %o2, %y
nop
nop
nop
sdivcc %o0, %o1, %o0
bvs,a 1f
xnor %o0, %g0, %o0 ! Corbett Correction Factor
1: retl
nop
SET_SIZE(.div)
ENTRY(.udiv)
wr %g0, %g0, %y
nop
nop
retl
udiv %o0, %o1, %o0
SET_SIZE(.udiv)
ENTRY(.rem)
sra %o0, 31, %o4
wr %o4, %g0, %y
nop
nop
nop
sdivcc %o0, %o1, %o2
bvs,a 1f
xnor %o2, %g0, %o2 ! Corbett Correction Factor
1: smul %o2, %o1, %o2
retl
sub %o0, %o2, %o0
SET_SIZE(.rem)
ENTRY(.urem)
wr %g0, %g0, %y
nop
nop
nop
udiv %o0, %o1, %o2
umul %o2, %o1, %o2
retl
sub %o0, %o2, %o0
SET_SIZE(.urem)