blob: 9c14e0c75bd2bcc5b6d71ade8901d9f2474e7ebb [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.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * ########################################################################
9 *
10 * This program is free software; you can distribute it and/or modify it
11 * under the terms of the GNU General Public License (Version 2) as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * ########################################################################
24 */
25
26
27#include "ieee754sp.h"
28
29ieee754sp ieee754sp_logb(ieee754sp x)
30{
31 COMPXSP;
32
33 CLEARCX;
34
35 EXPLODEXSP;
36
37 switch (xc) {
38 case IEEE754_CLASS_SNAN:
39 return ieee754sp_nanxcpt(x, "logb", x);
40 case IEEE754_CLASS_QNAN:
41 return x;
42 case IEEE754_CLASS_INF:
43 return ieee754sp_inf(0);
44 case IEEE754_CLASS_ZERO:
45 return ieee754sp_inf(1);
46 case IEEE754_CLASS_DNORM:
47 SPDNORMX;
48 break;
49 case IEEE754_CLASS_NORM:
50 break;
51 }
52 return ieee754sp_fint(xe);
53}