xref: /illumos-gate/usr/src/lib/libm/common/Q/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)
37 int
38 isnanl(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)
44 int
45 isnanl(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