77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
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/* $NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93";
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#else
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static char rcsid[] = "$NetBSD: mul.c,v 1.4 2003/08/07 16:43:19 agc Exp $";
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#endif
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#endif /* not lint */
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#include <stdio.h>
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main()
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{
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union { long long q; unsigned int v[2]; } a, b, m;
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char buf[300];
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extern long long __muldi3(long long, long long);
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for (;;) {
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printf("> ");
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if (fgets(buf, sizeof buf, stdin) == NULL)
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break;
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if (sscanf(buf, "%u:%u %u:%u",
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&a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 &&
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sscanf(buf, "0x%x:%x 0x%x:%x",
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&a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) {
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printf("eh?\n");
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continue;
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}
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m.q = __muldi3(a.q, b.q);
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printf("%x:%x * %x:%x => %x:%x\n",
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a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
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printf(" = %X%08X * %X%08X => %X%08X\n",
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a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
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}
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exit(0);
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}
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