isnanl.c revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
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#pragma weak __isnanl = isnanl
31
32#include "libm.h"
33
34#if defined(__sparc)
35int
36isnanl(long double x) {
37	int *px = (int *) &x;
38	return ((px[0] & ~0x80000000) >= 0x7fff0000 &&
39		((px[0] & ~0xffff0000) | px[1] | px[2] | px[3]) != 0);
40}
41#elif defined(__x86)
42int
43isnanl(long double x) {
44	int *px = (int *) &x, t = px[2] & 0x7fff;
45#if defined(HANDLE_UNSUPPORTED)
46	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0 ||
47		t != 0 && (px[1] & 0x80000000) == 0);
48#else
49	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
50#endif
51}
52#endif	/* defined(__sparc) || defined(__x86) */
53