Remove some unnecessary inclusions of <sys/cdefs.h> across the tree.
[dragonfly.git] / lib / libc / x86_64 / gen / isnanl.c
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1/*
2 * Copyright (c) 1992, 1993
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3 * The Regents of the University of California. All rights reserved.
4 *
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5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
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9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
05ecdcef 17 * 3. Neither the name of the University nor the names of its contributors
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18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
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33 * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
34 * $NetBSD: isnanl.c,v 1.5 2004/03/04 23:42:39 kleink Exp $
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35 */
36
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37#include <machine/ieee.h>
38#include <math.h>
17030342 39
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40/*
41 * 7.12.3.4 isnan - test for a NaN
42 * IEEE 754 compatible 80-bit extended-precision Intel 386 version
43 */
17030342 44int
05ecdcef 45__isnanl(long double x)
17030342 46{
05ecdcef 47 union ieee_ext_u u;
17030342 48
05ecdcef 49 u.extu_ld = x;
17030342 50
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51 return (u.extu_ext.ext_exp == EXT_EXP_INFNAN &&
52 u.extu_ext.ext_int == 1 &&
53 (u.extu_ext.ext_frach != 0 || u.extu_ext.ext_fracl != 0));
17030342 54}