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mul.c revision 1.2 
      1 /*	$NetBSD: mul.c,v 1.2 1995/02/27 17:31:34 cgd 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. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  */
     39 
     40 #ifndef lint
     41 static char copyright[] =
     42 "@(#) Copyright (c) 1992, 1993\n\
     43 	The Regents of the University of California.  All rights reserved.\n";
     44 #endif /* not lint */
     45 
     46 #ifndef lint
     47 #if 0
     48 static char sccsid[] = "@(#)mul.c	8.1 (Berkeley) 6/4/93";
     49 #else
     50 static char rcsid[] = "$NetBSD: mul.c,v 1.2 1995/02/27 17:31:34 cgd Exp $";
     51 #endif
     52 #endif /* not lint */
     53 
     54 #include <stdio.h>
     55 
     56 main()
     57 {
     58 	union { long long q; unsigned long v[2]; } a, b, m;
     59 	char buf[300];
     60 	extern long long __muldi3(long long, long long);
     61 
     62 	for (;;) {
     63 		printf("> ");
     64 		if (fgets(buf, sizeof buf, stdin) == NULL)
     65 			break;
     66 		if (sscanf(buf, "%lu:%lu %lu:%lu",
     67 			    &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 &&
     68 		    sscanf(buf, "0x%lx:%lx 0x%lx:%lx",
     69 			    &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) {
     70 			printf("eh?\n");
     71 			continue;
     72 		}
     73 		m.q = __muldi3(a.q, b.q);
     74 		printf("%lx:%lx * %lx:%lx => %lx:%lx\n",
     75 		    a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
     76 		printf("  = %lX%08lX * %lX%08lX => %lX%08lX\n",
     77 		    a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]);
     78 	}
     79 	exit(0);
     80 }
     81