blob: 770f0f4677cd5a8c542f670396872afc1cba4d69 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* IEEE754 floating point arithmetic
2 * single precision
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 "ieee754sp.h"
29
30int ieee754sp_finite(ieee754sp x)
31{
32 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
33}
34
35ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y)
36{
37 CLEARCX;
38 SPSIGN(x) = SPSIGN(y);
39 return x;
40}
41
42
43ieee754sp ieee754sp_neg(ieee754sp x)
44{
45 COMPXSP;
46
47 EXPLODEXSP;
48 CLEARCX;
49 FLUSHXSP;
50
Atsushi Nemotoc5033d72006-01-02 21:59:49 +090051 /*
52 * Invert the sign ALWAYS to prevent an endless recursion on
53 * pow() in libc.
54 */
55 /* quick fix up */
56 SPSIGN(x) ^= 1;
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 if (xc == IEEE754_CLASS_SNAN) {
Atsushi Nemotoc5033d72006-01-02 21:59:49 +090059 ieee754sp y = ieee754sp_indef();
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 SETCX(IEEE754_INVALID_OPERATION);
Atsushi Nemotoc5033d72006-01-02 21:59:49 +090061 SPSIGN(y) = SPSIGN(x);
62 return ieee754sp_nanxcpt(y, "neg");
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 }
64
65 if (ieee754sp_isnan(x)) /* but not infinity */
66 return ieee754sp_nanxcpt(x, "neg", x);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 return x;
68}
69
70
71ieee754sp ieee754sp_abs(ieee754sp x)
72{
73 COMPXSP;
74
75 EXPLODEXSP;
76 CLEARCX;
77 FLUSHXSP;
78
79 if (xc == IEEE754_CLASS_SNAN) {
80 SETCX(IEEE754_INVALID_OPERATION);
81 return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
82 }
83
84 if (ieee754sp_isnan(x)) /* but not infinity */
85 return ieee754sp_nanxcpt(x, "abs", x);
86
87 /* quick fix up */
88 SPSIGN(x) = 0;
89 return x;
90}