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 nan = __nan
31
32 /*
33 * nan(c) returns a NaN. This implementation ignores c.
34 */
35
36 #include "libm.h"
37 #include <sys/isa_defs.h>
38
39 #if defined(__sparc)
40
41 static const union {
42 unsigned i[2];
43 double d;
44 } __nan_union = { 0x7fffffff, 0xffffffff };
45
46 #elif defined(__i386) || defined(__amd64)
47
48 static const union {
49 unsigned i[2];
50 double d;
51 } __nan_union = { 0xffffffff, 0x7fffffff };
52
53 #else
54 #error Unknown architecture
55 #endif
56
57 /* ARGSUSED0 */
58 double
__nan(const char * c)59 __nan(const char *c) {
60 return (__nan_union.d);
61 }
62