1 /* $NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #ifndef lint
37 static char copyright[] =
38 "@(#) Copyright (c) 1992, 1993\n\
39 The Regents of the University of California. All rights reserved.\n";
40 #endif /* not lint */
41
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93";
45 #else
46 static char rcsid[] = "$NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $";
47 #endif
48 #endif /* not lint */
49
50 #include <stdio.h>
51
main()52 main()
53 {
54 union { long long q; unsigned int v[2]; } a, b, m;
55 char buf[300];
56 extern long long __muldi3(long long, long long);
57
58 for (;;) {
59 printf("> ");
60 if (fgets(buf, sizeof buf, stdin) == NULL)
61 break;
62 if (sscanf(buf, "%u:%u %u:%u",
63 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 &&
64 sscanf(buf, "0x%x:%x 0x%x:%x",
65 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) {
66 printf("eh?\n");
67 continue;
68 }
69 m.q = __muldi3(a.q, b.q);
70 printf("%x:%x * %x:%x => %x:%x\n",
71 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
72 printf(" = %X%08X * %X%08X => %X%08X\n",
73 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
74 }
75 exit(0);
76 }
77