1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1990, 1991 UNIX System Laboratories, Inc.	*/
28/*	Copyright (c) 1988 AT&T	*/
29/*	  All Rights Reserved	*/
30
31#pragma ident	"%Z%%M%	%I%	%E% SMI"
32
33#pragma weak _fpsetround = fpsetround
34
35#include "lint.h"
36#include <ieeefp.h>
37#include "fp.h"
38
39extern void	_getmxcsr(int *), _putmxcsr(int);
40
41fp_rnd
42fpsetround(fp_rnd newrnd)
43{
44	struct _cw87 cw;
45	fp_rnd oldrnd;
46	int	mxcsr;
47
48	newrnd &= 0x3;	/* mask off all ubt last 2 bits */
49	_getcw(&cw);
50	oldrnd = (fp_rnd)cw.rnd;
51	cw.rnd = newrnd;
52	_putcw(cw);
53	_getmxcsr(&mxcsr);
54	mxcsr = (mxcsr & ~0x6000) | ((int)newrnd << 13);
55	_putmxcsr(mxcsr);
56	return (oldrnd);
57}
58