xref: /src/sys/arch/hppa/spmath/mpyaccu.c

/*	$NetBSD: mpyaccu.c,v 1.1.10.1 2004/08/03 10:35:38 skrll Exp $	*/

/*	$OpenBSD: mpyaccu.c,v 1.5 2001/03/29 03:58:19 mickey Exp $	*/

/*
 * Copyright 1996 1995 by Open Software Foundation, Inc.
 *              All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies and
 * that both the copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*
 * pmk1.1
 */
/*
 * (c) Copyright 1986 HEWLETT-PACKARD COMPANY
 *
 * To anyone who acknowledges that this file is provided "AS IS"
 * without any express or implied warranty:
 *     permission to use, copy, modify, and distribute this file
 * for any purpose is hereby granted without fee, provided that
 * the above copyright notice and this notice appears in all
 * copies, and that the name of Hewlett-Packard Company not be
 * used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 * Hewlett-Packard Company makes no representations about the
 * suitability of this software for any purpose.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mpyaccu.c,v 1.1.10.1 2004/08/03 10:35:38 skrll Exp $");

#include "md.h"

void
mpyaccu(opnd1,opnd2,result)

unsigned int opnd1, opnd2;
struct mdsfu_register *result;
{
	struct mdsfu_register temp;
	int carry;

	impyu(&opnd1,&opnd2,&temp);

	/* get result of low word add, and check for carry out */
	if ((result_lo += (unsigned)temp.rslt_lo) < (unsigned)temp.rslt_lo)
		carry = 1;
	else carry = 0;

	/* get result of high word add, and determine overflow status */
	if ((result_hi += (unsigned)temp.rslt_hi + carry) <
		(unsigned)temp.rslt_hi) overflow = TRUE;

	return;
}