1 /* $NetBSD: mpyaccs.c,v 1.5 2012/02/04 17:03:10 skrll 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 1.5 2012/02/04 17:03:10 skrll Exp $");
46
47 #include "md.h"
48
49 void
mpyaccs(int opnd1,int opnd2,struct mdsfu_register * result)50 mpyaccs(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