fpclassify.c revision 331722 
1/*-
2 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
3 * Copyright (c) 2002, 2003 David Schultz <das@FreeBSD.ORG>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: stable/11/lib/libc/gen/fpclassify.c 331722 2018-03-29 02:50:57Z eadler $
28 */
29
30#include <sys/endian.h>
31
32#include <machine/float.h>
33
34#include <math.h>
35#include <stdint.h>
36
37#include "fpmath.h"
38
39int
40__fpclassifyf(float f)
41{
42	union IEEEf2bits u;
43
44	u.f = f;
45	if (u.bits.exp == 0) {
46		if (u.bits.man == 0)
47			return (FP_ZERO);
48		return (FP_SUBNORMAL);
49	}
50	if (u.bits.exp == 255) {
51		if (u.bits.man == 0)
52			return (FP_INFINITE);
53		return (FP_NAN);
54	}
55	return (FP_NORMAL);
56}
57
58int
59__fpclassifyd(double d)
60{
61	union IEEEd2bits u;
62
63	u.d = d;
64	if (u.bits.exp == 0) {
65		if ((u.bits.manl | u.bits.manh) == 0)
66			return (FP_ZERO);
67		return (FP_SUBNORMAL);
68	}
69	if (u.bits.exp == 2047) {
70		if ((u.bits.manl | u.bits.manh) == 0)
71			return (FP_INFINITE);
72		return (FP_NAN);
73	}
74	return (FP_NORMAL);
75}
76
77int
78__fpclassifyl(long double e)
79{
80	union IEEEl2bits u;
81
82	u.e = e;
83	if (u.bits.exp == 0) {
84		if ((u.bits.manl | u.bits.manh) == 0)
85			return (FP_ZERO);
86		return (FP_SUBNORMAL);
87	}
88	mask_nbit_l(u);		/* Mask normalization bit if applicable. */
89#if LDBL_MANT_DIG == 53
90	if (u.bits.exp == 2047) {
91		if ((u.bits.manl | u.bits.manh) == 0)
92			return (FP_INFINITE);
93		return (FP_NAN);
94	}
95#else
96	if (u.bits.exp == 32767) {
97		if ((u.bits.manl | u.bits.manh) == 0)
98			return (FP_INFINITE);
99		return (FP_NAN);
100	}
101#endif
102	return (FP_NORMAL);
103}
104