blob: 603388621ca5fd699e2194a181d2f56ecc51907c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
30ieee754dp ieee754dp_logb(ieee754dp x)
31{
32 COMPXDP;
33
34 CLEARCX;
35
36 EXPLODEXDP;
37
38 switch (xc) {
39 case IEEE754_CLASS_SNAN:
40 return ieee754dp_nanxcpt(x, "logb", x);
41 case IEEE754_CLASS_QNAN:
42 return x;
43 case IEEE754_CLASS_INF:
44 return ieee754dp_inf(0);
45 case IEEE754_CLASS_ZERO:
46 return ieee754dp_inf(1);
47 case IEEE754_CLASS_DNORM:
48 DPDNORMX;
49 break;
50 case IEEE754_CLASS_NORM:
51 break;
52 }
53 return ieee754dp_fint(xe);
54}