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Linux kernel mirror (for testing)
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1/* IEEE754 floating point arithmetic
2 * double precision: common utilities
3 */
4/*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd.
7 * http://www.algor.co.uk
8 *
9 * ########################################################################
10 *
11 * This program is free software; you can distribute it and/or modify it
12 * under the terms of the GNU General Public License (Version 2) as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 *
24 * ########################################################################
25 */
26
27
28#include "ieee754dp.h"
29
30int ieee754dp_finite(ieee754dp x)
31{
32 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
33}
34
35ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y)
36{
37 CLEARCX;
38 DPSIGN(x) = DPSIGN(y);
39 return x;
40}
41
42
43ieee754dp ieee754dp_neg(ieee754dp x)
44{
45 COMPXDP;
46
47 EXPLODEXDP;
48 CLEARCX;
49 FLUSHXDP;
50
51 if (xc == IEEE754_CLASS_SNAN) {
52 SETCX(IEEE754_INVALID_OPERATION);
53 return ieee754dp_nanxcpt(ieee754dp_indef(), "neg");
54 }
55
56 if (ieee754dp_isnan(x)) /* but not infinity */
57 return ieee754dp_nanxcpt(x, "neg", x);
58
59 /* quick fix up */
60 DPSIGN(x) ^= 1;
61 return x;
62}
63
64
65ieee754dp ieee754dp_abs(ieee754dp x)
66{
67 COMPXDP;
68
69 EXPLODEXDP;
70 CLEARCX;
71 FLUSHXDP;
72
73 if (xc == IEEE754_CLASS_SNAN) {
74 SETCX(IEEE754_INVALID_OPERATION);
75 return ieee754dp_nanxcpt(ieee754dp_indef(), "neg");
76 }
77
78 if (ieee754dp_isnan(x)) /* but not infinity */
79 return ieee754dp_nanxcpt(x, "abs", x);
80
81 /* quick fix up */
82 DPSIGN(x) = 0;
83 return x;
84}