xref: /illumos-gate/usr/src/lib/libc/sparc/gen/lmul.c (revision 7257d1b4)
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 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #include	"lint.h"
33 #include	"sys/types.h"
34 #include	"sys/dl.h"
35 
36 dl_t
37 lmul(dl_t lop, dl_t rop)
38 {
39 	dl_t		ans;
40 	dl_t		tmp;
41 	int	jj;
42 
43 	ans = lzero;
44 
45 	for (jj = 0; jj <= 63; jj++) {
46 		if ((lshiftl(rop, -jj).dl_lop & 1) == 0)
47 			continue;
48 		tmp = lshiftl(lop, jj);
49 		tmp.dl_hop &= 0x7fffffff;
50 		ans = ladd(ans, tmp);
51 	};
52 
53 	return (ans);
54 }
55