summaryrefslogtreecommitdiffstats
path: root/arch/mips/math-emu/sp_frexp.c
blob: 359c6483dbfa05299b318e236de00d579fb82676 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
/* IEEE754 floating point arithmetic
 * single precision
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 * http://www.algor.co.uk
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * ########################################################################
 */


#include "ieee754sp.h"

/* close to ieeep754sp_logb
*/
ieee754sp ieee754sp_frexp(ieee754sp x, int *eptr)
{
	COMPXSP;
	CLEARCX;
	EXPLODEXSP;

	switch (xc) {
	case IEEE754_CLASS_SNAN:
	case IEEE754_CLASS_QNAN:
	case IEEE754_CLASS_INF:
	case IEEE754_CLASS_ZERO:
		*eptr = 0;
		return x;
	case IEEE754_CLASS_DNORM:
		SPDNORMX;
		break;
	case IEEE754_CLASS_NORM:
		break;
	}
	*eptr = xe + 1;
	return buildsp(xs, -1 + SP_EBIAS, xm & ~SP_HIDDEN_BIT);
}