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sp_frexp.c
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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 /* close to ieeep754sp_logb
30 */
31 ieee754sp ieee754sp_frexp(ieee754sp x, int *eptr)
32 {
33  COMPXSP;
34  CLEARCX;
35  EXPLODEXSP;
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;
45  SPDNORMX;
46  break;
47  case IEEE754_CLASS_NORM:
48  break;
49  }
50  *eptr = xe + 1;
51  return buildsp(xs, -1 + SP_EBIAS, xm & ~SP_HIDDEN_BIT);
52 }