1/*	$NetBSD: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $	*/
2
3/*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein.
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: fpclassifyd.c,v 1.2 2004/01/20 19:29:43 matt Exp $");
35#endif
36
37#include <machine/vaxfp.h>
38#include <math.h>
39
40/*
41 * 7.12.3.1 fpclassify - classify real floating type
42 *          VAX D_floating version
43 *
44 *          Implementation notes:
45 *          Reserved operand -> FP_ROP
46 *          True zero        -> FP_ZERO
47 *          Dirty zero       -> FP_DIRTY_ZERO
48 *          Finite           -> FP_NORMAL
49 */
50int
51__fpclassifyd(double x)
52{
53	union vax_dfloating_u u;
54
55	u.dfltu_d = x;
56
57	if (u.dfltu_dflt.dflt_exp == 0) {
58		if (u.dfltu_dflt.dflt_sign != 0)
59			return FP_ROP;
60		else if (u.dfltu_dflt.dflt_frach != 0 ||
61			 u.dfltu_dflt.dflt_fracm != 0 ||
62			 u.dfltu_dflt.dflt_fracl != 0)
63			return FP_DIRTYZERO;
64		else
65			return FP_ZERO;
66	} else {
67		return FP_NORMAL;
68	}
69}
70