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