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 
ieee754sp_logb(ieee754sp x)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);
46 	case IEEE754_CLASS_DNORM:
47 		SPDNORMX;
48 		break;
49 	case IEEE754_CLASS_NORM:
50 		break;
51 	}
52 	return ieee754sp_fint(xe);
53 }
54