1 /* $NetBSD: fpclassifyd.c,v 1.3 2008/04/28 20:22:57 martin 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 1.3 2008/04/28 20:22:57 martin 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 */
50 int
__fpclassifyd(double x)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