1*2fe8fb19SBen Gras /* $NetBSD: fpclassifyl.c,v 1.3 2008/04/28 20:22:56 martin Exp $ */
2*2fe8fb19SBen Gras
3*2fe8fb19SBen Gras /*-
4*2fe8fb19SBen Gras * Copyright (c) 2003 The NetBSD Foundation, Inc.
5*2fe8fb19SBen Gras * All rights reserved.
6*2fe8fb19SBen Gras *
7*2fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation
8*2fe8fb19SBen Gras * by Klaus Klein.
9*2fe8fb19SBen Gras *
10*2fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without
11*2fe8fb19SBen Gras * modification, are permitted provided that the following conditions
12*2fe8fb19SBen Gras * are met:
13*2fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright
14*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer.
15*2fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright
16*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the
17*2fe8fb19SBen Gras * documentation and/or other materials provided with the distribution.
18*2fe8fb19SBen Gras *
19*2fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20*2fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21*2fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22*2fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23*2fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24*2fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25*2fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26*2fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27*2fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*2fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29*2fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE.
30*2fe8fb19SBen Gras */
31*2fe8fb19SBen Gras
32*2fe8fb19SBen Gras #include <sys/cdefs.h>
33*2fe8fb19SBen Gras #if defined(LIBC_SCCS) && !defined(lint)
34*2fe8fb19SBen Gras __RCSID("$NetBSD: fpclassifyl.c,v 1.3 2008/04/28 20:22:56 martin Exp $");
35*2fe8fb19SBen Gras #endif
36*2fe8fb19SBen Gras
37*2fe8fb19SBen Gras #include <machine/ieee.h>
38*2fe8fb19SBen Gras #include <assert.h>
39*2fe8fb19SBen Gras #include <math.h>
40*2fe8fb19SBen Gras
41*2fe8fb19SBen Gras /*
42*2fe8fb19SBen Gras * 7.12.3.1 fpclassify - classify real floating type
43*2fe8fb19SBen Gras * IEEE 754 compatible 80-bit extended-precision Motorola 68k version
44*2fe8fb19SBen Gras */
45*2fe8fb19SBen Gras int
__fpclassifyl(long double x)46*2fe8fb19SBen Gras __fpclassifyl(long double x)
47*2fe8fb19SBen Gras {
48*2fe8fb19SBen Gras union ieee_ext_u u;
49*2fe8fb19SBen Gras
50*2fe8fb19SBen Gras u.extu_ld = x;
51*2fe8fb19SBen Gras
52*2fe8fb19SBen Gras _DIAGASSERT(u.extu_ext.ext_zero == 0);
53*2fe8fb19SBen Gras
54*2fe8fb19SBen Gras if (u.extu_ext.ext_exp == 0 &&
55*2fe8fb19SBen Gras (u.extu_ext.ext_frach & 0x80000000) == 0) {
56*2fe8fb19SBen Gras if ((u.extu_ext.ext_frach & 0x7fffffff) == 0 &&
57*2fe8fb19SBen Gras u.extu_ext.ext_fracl == 0)
58*2fe8fb19SBen Gras return FP_ZERO;
59*2fe8fb19SBen Gras else
60*2fe8fb19SBen Gras return FP_SUBNORMAL;
61*2fe8fb19SBen Gras } else if (u.extu_ext.ext_exp == EXT_EXP_INFNAN) {
62*2fe8fb19SBen Gras if ((u.extu_ext.ext_frach & 0x7fffffff) == 0 &&
63*2fe8fb19SBen Gras u.extu_ext.ext_fracl == 0)
64*2fe8fb19SBen Gras return FP_INFINITE;
65*2fe8fb19SBen Gras else
66*2fe8fb19SBen Gras return FP_NAN;
67*2fe8fb19SBen Gras }
68*2fe8fb19SBen Gras
69*2fe8fb19SBen Gras return FP_NORMAL;
70*2fe8fb19SBen Gras }
71