1 /* $NetBSD: mpyaccu.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $ */ 2 3 /* $OpenBSD: mpyaccu.c,v 1.5 2001/03/29 03:58:19 mickey Exp $ */ 4 5 /* 6 * Copyright 1996 1995 by Open Software Foundation, Inc. 7 * All Rights Reserved 8 * 9 * Permission to use, copy, modify, and distribute this software and 10 * its documentation for any purpose and without fee is hereby granted, 11 * provided that the above copyright notice appears in all copies and 12 * that both the copyright notice and this permission notice appear in 13 * supporting documentation. 14 * 15 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 17 * FOR A PARTICULAR PURPOSE. 18 * 19 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 21 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 22 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 23 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 24 * 25 */ 26 /* 27 * pmk1.1 28 */ 29 /* 30 * (c) Copyright 1986 HEWLETT-PACKARD COMPANY 31 * 32 * To anyone who acknowledges that this file is provided "AS IS" 33 * without any express or implied warranty: 34 * permission to use, copy, modify, and distribute this file 35 * for any purpose is hereby granted without fee, provided that 36 * the above copyright notice and this notice appears in all 37 * copies, and that the name of Hewlett-Packard Company not be 38 * used in advertising or publicity pertaining to distribution 39 * of the software without specific, written prior permission. 40 * Hewlett-Packard Company makes no representations about the 41 * suitability of this software for any purpose. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: mpyaccu.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $"); 46 47 #include "md.h" 48 49 void 50 mpyaccu(opnd1,opnd2,result) 51 52 unsigned int opnd1, opnd2; 53 struct mdsfu_register *result; 54 { 55 struct mdsfu_register temp; 56 int carry; 57 58 impyu(&opnd1,&opnd2,&temp); 59 60 /* get result of low word add, and check for carry out */ 61 if ((result_lo += (unsigned)temp.rslt_lo) < (unsigned)temp.rslt_lo) 62 carry = 1; 63 else carry = 0; 64 65 /* get result of high word add, and determine overflow status */ 66 if ((result_hi += (unsigned)temp.rslt_hi + carry) < 67 (unsigned)temp.rslt_hi) overflow = true; 68 69 return; 70 } 71