isnanl.c revision 25c28e83beb90e7c80452a7c818c5e6f73a07dc8
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 2011 Nexenta Systems, Inc.  All rights reserved.
24 */
25/*
26 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27 * Use is subject to license terms.
28 */
29
30#if defined(ELFOBJ)
31#pragma weak isnanl = __isnanl
32#endif
33
34#include "libm.h"
35
36#if defined(__sparc)
37int
38isnanl(long double x) {
39	int *px = (int *) &x;
40	return ((px[0] & ~0x80000000) >= 0x7fff0000 &&
41		((px[0] & ~0xffff0000) | px[1] | px[2] | px[3]) != 0);
42}
43#elif defined(__x86)
44int
45isnanl(long double x) {
46	int *px = (int *) &x, t = px[2] & 0x7fff;
47#if defined(HANDLE_UNSUPPORTED)
48	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0 ||
49		t != 0 && (px[1] & 0x80000000) == 0);
50#else
51	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
52#endif
53}
54#endif	/* defined(__sparc) || defined(__x86) */
55