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
23 int
__fpclassify(double d)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 }
44 DEF_STRONG(__fpclassify);
45
46 int
__fpclassifyf(float f)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 }
67 DEF_STRONG(__fpclassifyf);
68
69 #if LDBL_MANT_DIG == DBL_MANT_DIG
70 MAKE_CLONE(__fpclassifyl, __fpclassify);
71 DEF_STRONG(__fpclassifyl);
72 #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
73