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 /*
33 * This set of routines used to be implemented mostly in assembler.
34 *
35 * Since the purpose they have is now rather vestigial, and 64-bit
36 * machines can do operations on 64-bit quantities pretty efficiently,
37 * a C implementation seems quite adequate and much more maintainable.
38 */
39
40 #include "lint.h"
41 #include <sys/types.h>
42 #include <sys/dl.h>
43
44 typedef union {
45 long xword;
46 dl_t dl;
47 } dlx_t;
48
49 dl_t
ladd(dl_t lop,dl_t rop)50 ladd(dl_t lop, dl_t rop)
51 {
52 dlx_t r;
53 /* LINTED pointer cast may result in improper alignment */
54 r.xword = *(long *)&lop + *(long *)&rop;
55 return (r.dl);
56 }
57
58 dl_t
lshiftl(dl_t op,int cnt)59 lshiftl(dl_t op, int cnt)
60 {
61 dlx_t r;
62 if (cnt < 0)
63 /* LINTED pointer cast may result in improper alignment */
64 r.xword = (long)(*(ulong_t *)&op >> (-cnt));
65 else
66 /* LINTED pointer cast may result in improper alignment */
67 r.xword = *(long *)&op << cnt;
68 return (r.dl);
69 }
70
71 int
lsign(dl_t op)72 lsign(dl_t op)
73 {
74 /* LINTED pointer cast may result in improper alignment */
75 return ((*(long *)&op) >> 63);
76 }
77
78 dl_t
lsub(dl_t lop,dl_t rop)79 lsub(dl_t lop, dl_t rop)
80 {
81 dlx_t r;
82 /* LINTED pointer cast may result in improper alignment */
83 r.xword = *(long *)&lop - *(long *)&rop;
84 return (r.dl);
85 }
86
87 dl_t
lmul(dl_t lop,dl_t rop)88 lmul(dl_t lop, dl_t rop)
89 {
90 dlx_t r;
91 /* LINTED pointer cast may result in improper alignment */
92 r.xword = *(long *)&lop * *(long *)&rop;
93 return (r.dl);
94 }
95