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

   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*/
  31ieee754dp 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