1 /* IEEE754 floating point arithmetic
2 * single precision
3 */
4 /*
5 * MIPS floating point support
6 * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved.
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
30 /* close to ieeep754sp_logb
31 */
ieee754sp_frexp(ieee754sp x,int * eptr)32 ieee754sp ieee754sp_frexp(ieee754sp x, int *eptr)
33 {
34 COMPXSP;
35 CLEARCX;
36 EXPLODEXSP;
37
38 switch (xc) {
39 case IEEE754_CLASS_SNAN:
40 case IEEE754_CLASS_QNAN:
41 case IEEE754_CLASS_INF:
42 case IEEE754_CLASS_ZERO:
43 *eptr = 0;
44 return x;
45 case IEEE754_CLASS_DNORM:
46 SPDNORMX;
47 break;
48 case IEEE754_CLASS_NORM:
49 break;
50 }
51 *eptr = xe + 1;
52 return buildsp(xs, -1 + SP_EBIAS, xm & ~SP_HIDDEN_BIT);
53 }
54