xref: /titanic_50/usr/src/lib/libc/i386/fp/fpsetsticky.c (revision da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <ieeefp.h>
30 #include "synonyms.h"
31 
32 #pragma weak fpsetsticky = _fpsetsticky
33 
34 extern int	_sse_hw;
35 extern void	_getsw(int *), _putsw(int), _getmxcsr(int *), _putmxcsr(int);
36 
37 fp_except
38 fpsetsticky(fp_except s)
39 {
40 	int		sw, mxcsr;
41 
42 	_getsw(&sw);
43 	_putsw((int)s);
44 	if (_sse_hw) {
45 		_getmxcsr(&mxcsr);
46 		sw |= mxcsr;
47 		mxcsr = (mxcsr & ~0x3f) | ((int)s & 0x3f);
48 		_putmxcsr(mxcsr);
49 	}
50 	return ((fp_except)(sw & 0x3f));
51 }
52