xref: /titanic_52/usr/src/lib/libc/sparc/gen/lmul.c (revision a60fc142342386d0b786e65fba901234400d7020)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 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 /*	Copyright (c) 1988 AT&T	*/
30 /*	  All Rights Reserved  	*/
31 
32 
33 #pragma weak lmul = _lmul
34 
35 #include	"synonyms.h"
36 #include	"sys/types.h"
37 #include	"sys/dl.h"
38 
39 dl_t
40 lmul(dl_t lop, dl_t rop)
41 {
42 	dl_t		ans;
43 	dl_t		tmp;
44 	int	jj;
45 
46 	ans = lzero;
47 
48 	for (jj = 0; jj <= 63; jj++) {
49 		if ((lshiftl(rop, -jj).dl_lop & 1) == 0)
50 			continue;
51 		tmp = lshiftl(lop, jj);
52 		tmp.dl_hop &= 0x7fffffff;
53 		ans = ladd(ans, tmp);
54 	};
55 
56 	return (ans);
57 }
58