Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
sp_logb.c
Go to the documentation of this file.
1 /* IEEE754 floating point arithmetic
2  * single precision
3  */
4 /*
5  * MIPS floating point support
6  * Copyright (C) 1994-2000 Algorithmics Ltd.
7  *
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 
29 ieee754sp 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);
47  SPDNORMX;
48  break;
49  case IEEE754_CLASS_NORM:
50  break;
51  }
52  return ieee754sp_fint(xe);
53 }