xref: /illumos-gate/usr/src/lib/libm/common/Q/isnanl.c (revision 25c28e83)
1*25c28e83SPiotr Jasiukajtis /*
2*25c28e83SPiotr Jasiukajtis  * CDDL HEADER START
3*25c28e83SPiotr Jasiukajtis  *
4*25c28e83SPiotr Jasiukajtis  * The contents of this file are subject to the terms of the
5*25c28e83SPiotr Jasiukajtis  * Common Development and Distribution License (the "License").
6*25c28e83SPiotr Jasiukajtis  * You may not use this file except in compliance with the License.
7*25c28e83SPiotr Jasiukajtis  *
8*25c28e83SPiotr Jasiukajtis  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*25c28e83SPiotr Jasiukajtis  * or http://www.opensolaris.org/os/licensing.
10*25c28e83SPiotr Jasiukajtis  * See the License for the specific language governing permissions
11*25c28e83SPiotr Jasiukajtis  * and limitations under the License.
12*25c28e83SPiotr Jasiukajtis  *
13*25c28e83SPiotr Jasiukajtis  * When distributing Covered Code, include this CDDL HEADER in each
14*25c28e83SPiotr Jasiukajtis  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*25c28e83SPiotr Jasiukajtis  * If applicable, add the following below this CDDL HEADER, with the
16*25c28e83SPiotr Jasiukajtis  * fields enclosed by brackets "[]" replaced with your own identifying
17*25c28e83SPiotr Jasiukajtis  * information: Portions Copyright [yyyy] [name of copyright owner]
18*25c28e83SPiotr Jasiukajtis  *
19*25c28e83SPiotr Jasiukajtis  * CDDL HEADER END
20*25c28e83SPiotr Jasiukajtis  */
21*25c28e83SPiotr Jasiukajtis 
22*25c28e83SPiotr Jasiukajtis /*
23*25c28e83SPiotr Jasiukajtis  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
24*25c28e83SPiotr Jasiukajtis  */
25*25c28e83SPiotr Jasiukajtis /*
26*25c28e83SPiotr Jasiukajtis  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27*25c28e83SPiotr Jasiukajtis  * Use is subject to license terms.
28*25c28e83SPiotr Jasiukajtis  */
29*25c28e83SPiotr Jasiukajtis 
30*25c28e83SPiotr Jasiukajtis #if defined(ELFOBJ)
31*25c28e83SPiotr Jasiukajtis #pragma weak isnanl = __isnanl
32*25c28e83SPiotr Jasiukajtis #endif
33*25c28e83SPiotr Jasiukajtis 
34*25c28e83SPiotr Jasiukajtis #include "libm.h"
35*25c28e83SPiotr Jasiukajtis 
36*25c28e83SPiotr Jasiukajtis #if defined(__sparc)
37*25c28e83SPiotr Jasiukajtis int
38*25c28e83SPiotr Jasiukajtis isnanl(long double x) {
39*25c28e83SPiotr Jasiukajtis 	int *px = (int *) &x;
40*25c28e83SPiotr Jasiukajtis 	return ((px[0] & ~0x80000000) >= 0x7fff0000 &&
41*25c28e83SPiotr Jasiukajtis 		((px[0] & ~0xffff0000) | px[1] | px[2] | px[3]) != 0);
42*25c28e83SPiotr Jasiukajtis }
43*25c28e83SPiotr Jasiukajtis #elif defined(__x86)
44*25c28e83SPiotr Jasiukajtis int
45*25c28e83SPiotr Jasiukajtis isnanl(long double x) {
46*25c28e83SPiotr Jasiukajtis 	int *px = (int *) &x, t = px[2] & 0x7fff;
47*25c28e83SPiotr Jasiukajtis #if defined(HANDLE_UNSUPPORTED)
48*25c28e83SPiotr Jasiukajtis 	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0 ||
49*25c28e83SPiotr Jasiukajtis 		t != 0 && (px[1] & 0x80000000) == 0);
50*25c28e83SPiotr Jasiukajtis #else
51*25c28e83SPiotr Jasiukajtis 	return (t == 0x7fff && ((px[1] & ~0x80000000) | px[0]) != 0);
52*25c28e83SPiotr Jasiukajtis #endif
53*25c28e83SPiotr Jasiukajtis }
54*25c28e83SPiotr Jasiukajtis #endif	/* defined(__sparc) || defined(__x86) */
55