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: head/lib/libc/gen/fpclassify.c 141379 2005-02-06 03:23:31Z das $
28 */
29
30 #include <sys/endian.h>
31
32 #include <math.h>
33 #include <stdint.h>
34
35 #include "fpmath.h"
36
37 int
__fpclassifyf(float f)38 __fpclassifyf(float f)
39 {
40 union IEEEf2bits u;
41
42 u.f = f;
43 if (u.bits.exp == 0) {
44 if (u.bits.man == 0)
45 return (FP_ZERO);
46 return (FP_SUBNORMAL);
47 }
48 if (u.bits.exp == 255) {
49 if (u.bits.man == 0)
50 return (FP_INFINITE);
51 return (FP_NAN);
52 }
53 return (FP_NORMAL);
54 }
55
56 int
__fpclassifyd(double d)57 __fpclassifyd(double d)
58 {
59 union IEEEd2bits u;
60
61 u.d = d;
62 if (u.bits.exp == 0) {
63 if ((u.bits.manl | u.bits.manh) == 0)
64 return (FP_ZERO);
65 return (FP_SUBNORMAL);
66 }
67 if (u.bits.exp == 2047) {
68 if ((u.bits.manl | u.bits.manh) == 0)
69 return (FP_INFINITE);
70 return (FP_NAN);
71 }
72 return (FP_NORMAL);
73 }
74
75 int
__fpclassifyl(long double e)76 __fpclassifyl(long double e)
77 {
78 union IEEEl2bits u;
79
80 u.e = e;
81 if (u.bits.exp == 0) {
82 if ((u.bits.manl | u.bits.manh) == 0)
83 return (FP_ZERO);
84 return (FP_SUBNORMAL);
85 }
86 mask_nbit_l(u); /* Mask normalization bit if applicable. */
87 if (u.bits.exp == 32767) {
88 if ((u.bits.manl | u.bits.manh) == 0)
89 return (FP_INFINITE);
90 return (FP_NAN);
91 }
92 return (FP_NORMAL);
93 }
94