1 /* $OpenBSD: fpclassifyl.c,v 1.2 2015/10/27 05:54:49 guenther Exp $ */
2 /*
3 * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <sys/types.h>
19 #include <machine/ieee.h>
20 #include <math.h>
21
22 int
__fpclassifyl(long double e)23 __fpclassifyl(long double e)
24 {
25 struct ieee_ext *p = (struct ieee_ext *)&e;
26
27 if (p->ext_exp == 0) {
28 if (p->ext_frach == 0 && p->ext_fracl == 0)
29 return FP_ZERO;
30 else
31 return FP_SUBNORMAL;
32 }
33
34 p->ext_frach &= ~0x80000000; /* clear normalization bit */
35
36 if (p->ext_exp == EXT_EXP_INFNAN) {
37 if (p->ext_frach == 0 && p->ext_fracl == 0)
38 return FP_INFINITE;
39 else
40 return FP_NAN;
41 }
42
43 return FP_NORMAL;
44 }
45 DEF_STRONG(__fpclassifyl);
46