1/*	$NetBSD: mpyaccs.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $	*/
2
3/*	$OpenBSD: mpyaccs.c,v 1.4 2001/03/29 03:58:18 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: mpyaccs.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $");
46
47#include "md.h"
48
49void
50mpyaccs(int opnd1, int opnd2, struct mdsfu_register *result)
51{
52	struct mdsfu_register temp;
53	int carry, sign;
54
55	impys(&opnd1,&opnd2,&temp);
56
57	/* get result of low word add, and check for carry out */
58	if ((result_lo += (unsigned)temp.rslt_lo) < (unsigned)temp.rslt_lo)
59		carry = 1;
60	else carry = 0;
61
62	/* get result of high word add, and determine overflow status */
63	sign = result_hi ^ temp.rslt_hi;
64	result_hi += temp.rslt_hi + carry;
65	if (sign >= 0 && (temp.rslt_hi ^ result_hi) < 0) overflow = true;
66
67	return;
68}
69