xref: /titanic_51/usr/src/lib/libc/i386/gen/lmul.s (revision c4800545504378963d9f2eeb253f06899664f9f6)
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#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29	.file	"%M%"
30
31/ Double long multiply routine.
32
33#include "SYS.h"
34
35	.set	lop,8
36	.set	rop,16
37	.set	ans,0
38
39	ENTRY(lmul)
40	popl	%eax
41	xchgl	%eax,0(%esp)
42
43	pushl	%eax
44
45	movl	lop+4(%esp),%eax
46	mull	rop(%esp)	/ high(lop) * low(rop)
47	movl	%eax,%ecx	/ partial high(product)
48
49	movl	rop+4(%esp),%eax
50	mull	lop(%esp)	/ high(rop) * low(lop)
51	addl	%eax,%ecx	/ partial sum of high(product)
52
53	movl	rop(%esp),%eax
54	mull	lop(%esp)	/ low(rop) * low(lop)
55	addl	%edx,%ecx	/ final high(product)
56
57	movl	%eax,%edx
58	popl	%eax
59	movl	%edx,ans(%eax)
60	movl	%ecx,ans+4(%eax)
61
62	ret
63	SET_SIZE(lmul)
64