1 /* IEEE754 floating point arithmetic
2 * double precision: common utilities
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 "ieee754dp.h"
28
29 /* close to ieeep754dp_logb
30 */
ieee754dp_frexp(ieee754dp x,int * eptr)31 ieee754dp ieee754dp_frexp(ieee754dp x, int *eptr)
32 {
33 COMPXDP;
34 CLEARCX;
35 EXPLODEXDP;
36
37 switch (xc) {
38 case IEEE754_CLASS_SNAN:
39 case IEEE754_CLASS_QNAN:
40 case IEEE754_CLASS_INF:
41 case IEEE754_CLASS_ZERO:
42 *eptr = 0;
43 return x;
44 case IEEE754_CLASS_DNORM:
45 DPDNORMX;
46 break;
47 case IEEE754_CLASS_NORM:
48 break;
49 }
50 *eptr = xe + 1;
51 return builddp(xs, -1 + DP_EBIAS, xm & ~DP_HIDDEN_BIT);
52 }
53