1/* $NetBSD: mul.c,v 1.3 2002/10/20 10:15:48 scw 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 37static 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 44static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93"; 45#else 46static char rcsid[] = "$NetBSD: mul.c,v 1.3 2002/10/20 10:15:48 scw Exp $"; 47#endif 48#endif /* not lint */ 49 50#include <stdio.h> 51 52main() 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