LXR linux/arch/mips/math-emu/sp

   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}
  54