1/*	$OpenBSD: fpclassifyl.c,v 1.1 2021/04/27 04:36:00 drahn 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 <math.h>
21
22int
23__fpclassifyl(long double e)
24{
25	struct ieee_ext *p = (struct ieee_ext *)&e;
26
27	if (p->ext_exp == 0) {
28		if (p->ext_frach == 0 && p->ext_frachm == 0 &&
29		    p->ext_fraclm == 0 && p->ext_fracl == 0)
30			return FP_ZERO;
31		else
32			return FP_SUBNORMAL;
33	}
34
35	if (p->ext_exp == EXT_EXP_INFNAN) {
36		if (p->ext_frach == 0 && p->ext_frachm == 0 &&
37		    p->ext_fraclm == 0 && p->ext_fracl == 0)
38			return FP_INFINITE;
39		else
40			return FP_NAN;
41	}
42
43	return FP_NORMAL;
44}
45DEF_STRONG(__fpclassifyl);
46