sys/arch/hppa/spmath/mpyaccs.c

   1 /*      $NetBSD: mpyaccs.c,v 1.3 2005/12/11 12:17:40 christos 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 1.3 2005/12/11 12:17:40 christos Exp $");
  46
  47 #include "md.h"
  48
  49 void
  50 mpyaccs(opnd1,opnd2,result)
  51
  52 int opnd1, opnd2;
  53 struct mdsfu_register *result;
  54 {
  55         struct mdsfu_register temp;
  56         int carry, sign;
  57
  58         impys(&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         sign = result_hi ^ temp.rslt_hi;
  67         result_hi += temp.rslt_hi + carry;
  68         if (sign >= 0 && (temp.rslt_hi ^ result_hi) < 0) overflow = true;
  69
  70         return;
  71 }