1 1.4 agc /* $NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $ */ 2 1.2 cgd 3 1.1 cgd /*- 4 1.1 cgd * Copyright (c) 1992, 1993 5 1.1 cgd * The Regents of the University of California. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This software was developed by the Computer Systems Engineering group 8 1.1 cgd * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 cgd * contributed to Berkeley. 10 1.1 cgd * 11 1.1 cgd * Redistribution and use in source and binary forms, with or without 12 1.1 cgd * modification, are permitted provided that the following conditions 13 1.1 cgd * are met: 14 1.1 cgd * 1. Redistributions of source code must retain the above copyright 15 1.1 cgd * notice, this list of conditions and the following disclaimer. 16 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 cgd * notice, this list of conditions and the following disclaimer in the 18 1.1 cgd * documentation and/or other materials provided with the distribution. 19 1.4 agc * 3. Neither the name of the University nor the names of its contributors 20 1.1 cgd * may be used to endorse or promote products derived from this software 21 1.1 cgd * without specific prior written permission. 22 1.1 cgd * 23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 cgd * SUCH DAMAGE. 34 1.1 cgd */ 35 1.1 cgd 36 1.1 cgd #ifndef lint 37 1.1 cgd static char copyright[] = 38 1.1 cgd "@(#) Copyright (c) 1992, 1993\n\ 39 1.1 cgd The Regents of the University of California. All rights reserved.\n"; 40 1.1 cgd #endif /* not lint */ 41 1.1 cgd 42 1.1 cgd #ifndef lint 43 1.2 cgd #if 0 44 1.1 cgd static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93"; 45 1.2 cgd #else 46 1.4 agc static char rcsid[] = "$NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $"; 47 1.2 cgd #endif 48 1.1 cgd #endif /* not lint */ 49 1.1 cgd 50 1.1 cgd #include <stdio.h> 51 1.1 cgd 52 1.1 cgd main() 53 1.1 cgd { 54 1.3 scw union { long long q; unsigned int v[2]; } a, b, m; 55 1.1 cgd char buf[300]; 56 1.1 cgd extern long long __muldi3(long long, long long); 57 1.1 cgd 58 1.1 cgd for (;;) { 59 1.1 cgd printf("> "); 60 1.1 cgd if (fgets(buf, sizeof buf, stdin) == NULL) 61 1.1 cgd break; 62 1.3 scw if (sscanf(buf, "%u:%u %u:%u", 63 1.1 cgd &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 && 64 1.3 scw sscanf(buf, "0x%x:%x 0x%x:%x", 65 1.1 cgd &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) { 66 1.1 cgd printf("eh?\n"); 67 1.1 cgd continue; 68 1.1 cgd } 69 1.1 cgd m.q = __muldi3(a.q, b.q); 70 1.3 scw printf("%x:%x * %x:%x => %x:%x\n", 71 1.1 cgd a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 72 1.3 scw printf(" = %X%08X * %X%08X => %X%08X\n", 73 1.1 cgd a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 74 1.1 cgd } 75 1.1 cgd exit(0); 76 1.1 cgd } 77
Indexes created Sun Sep 21 20:09:37 GMT 2025