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/arch/mips/math-emu/sp_frexp.c

https://bitbucket.org/evzijst/gittest
C | 53 lines | 22 code | 4 blank | 27 comment | 1 complexity | 517cf95b22e0cd6c19dcb2cb60e06048 MD5 | raw file
 1/* IEEE754 floating point arithmetic
 2 * single precision
 3 */
 4/*
 5 * MIPS floating point support
 6 * Copyright (C) 1994-2000 Algorithmics Ltd.
 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*/
32ieee754sp 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}