1 /* $OpenBSD: mpyaccs.c,v 1.6 2003/04/10 17:27:58 mickey Exp $ */
2 /*
3 (c) Copyright 1986 HEWLETT-PACKARD COMPANY
4 To anyone who acknowledges that this file is provided "AS IS"
5 without any express or implied warranty:
6 permission to use, copy, modify, and distribute this file
7 for any purpose is hereby granted without fee, provided that
8 the above copyright notice and this notice appears in all
9 copies, and that the name of Hewlett-Packard Company not be
10 used in advertising or publicity pertaining to distribution
11 of the software without specific, written prior permission.
12 Hewlett-Packard Company makes no representations about the
13 suitability of this software for any purpose.
14 */
15 /* @(#)mpyaccs.c: Revision: 1.6.88.1 Date: 93/12/07 15:06:39 */
16
17 #include "md.h"
18
19 void
mpyaccs(opnd1,opnd2,result)20 mpyaccs(opnd1,opnd2,result)
21 int opnd1, opnd2;
22 struct mdsfu_register *result;
23 {
24 struct mdsfu_register temp;
25 int carry, sign;
26
27 s_xmpy(&opnd1,&opnd2,&temp);
28
29 /* get result of low word add, and check for carry out */
30 if ((result_lo += (unsigned)temp.rslt_lo) < (unsigned)temp.rslt_lo)
31 carry = 1;
32 else
33 carry = 0;
34
35 /* get result of high word add, and determine overflow status */
36 sign = result_hi ^ temp.rslt_hi;
37 result_hi += temp.rslt_hi + carry;
38 if (sign >= 0 && (temp.rslt_hi ^ result_hi) < 0)
39 overflow = TRUE;
40 }
41