1 /* $NetBSD: fpclassifyl_ieee754.c,v 1.3 2013/11/23 11:40:56 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: fpclassifyl_ieee754.c,v 1.3 2013/11/23 11:40:56 martin Exp $");
35 #endif
36
37 #include <machine/ieee.h>
38 #include <math.h>
39
40 #ifdef __HAVE_LONG_DOUBLE
41 /*
42 * 7.12.3.1 fpclassify - classify real floating type
43 * IEEE 754 compatible 128-bit extended-precision version
44 */
45 int
__fpclassifyl(long double x)46 __fpclassifyl(long double x)
47 {
48 union ieee_ext_u u;
49
50 u.extu_ld = x;
51
52 if (u.extu_ext.ext_exp == 0) {
53 if (u.extu_ext.ext_frach == 0
54 #if EXT_FRACHMBITS
55 && u.extu_ext.ext_frachm == 0
56 #endif
57 #if EXT_FRACLMBITS
58 && u.extu_ext.ext_fraclm == 0
59 #endif
60 && u.extu_ext.ext_fracl == 0)
61 return FP_ZERO;
62 else
63 return FP_SUBNORMAL;
64 } else if (u.extu_ext.ext_exp == EXT_EXP_INFNAN) {
65 if (u.extu_ext.ext_frach == 0
66 #if EXT_FRACHMBITS
67 && u.extu_ext.ext_frachm == 0
68 #endif
69 #if EXT_FRACLMBITS
70 && u.extu_ext.ext_fraclm == 0
71 #endif
72 && u.extu_ext.ext_fracl == 0)
73 return FP_INFINITE;
74 else
75 return FP_NAN;
76 }
77
78 return FP_NORMAL;
79 }
80 #endif /* __HAVE_LONG_DOUBLE */
81