1/*	$OpenBSD: fpclassify.c,v 1.9 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 <float.h>
21#include <math.h>
22
23int
24__fpclassify(double d)
25{
26	struct ieee_double *p = (struct ieee_double *)&d;
27
28	if (p->dbl_exp == 0) {
29		if (p->dbl_frach == 0 && p->dbl_fracl == 0)
30			return FP_ZERO;
31		else
32			return FP_SUBNORMAL;
33	}
34
35	if (p->dbl_exp == DBL_EXP_INFNAN) {
36		if (p->dbl_frach == 0 && p->dbl_fracl == 0)
37			return FP_INFINITE;
38		else
39			return FP_NAN;
40	}
41
42	return FP_NORMAL;
43}
44DEF_STRONG(__fpclassify);
45
46int
47__fpclassifyf(float f)
48{
49	struct ieee_single *p = (struct ieee_single *)&f;
50
51	if (p->sng_exp == 0) {
52		if (p->sng_frac == 0)
53			return FP_ZERO;
54		else
55			return FP_SUBNORMAL;
56	}
57
58	if (p->sng_exp == SNG_EXP_INFNAN) {
59		if (p->sng_frac == 0)
60			return FP_INFINITE;
61		else
62			return FP_NAN;
63	}
64
65	return FP_NORMAL;
66}
67DEF_STRONG(__fpclassifyf);
68
69#if	LDBL_MANT_DIG == DBL_MANT_DIG
70MAKE_CLONE(__fpclassifyl, __fpclassify);
71DEF_STRONG(__fpclassifyl);
72#endif	/* LDBL_MANT_DIG == DBL_MANT_DIG */
73