linux/arch/mips/math-emu/dp_logb.c
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   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
  29ieee754dp ieee754dp_logb(ieee754dp x)
  30{
  31        COMPXDP;
  32
  33        CLEARCX;
  34
  35        EXPLODEXDP;
  36
  37        switch (xc) {
  38        case IEEE754_CLASS_SNAN:
  39                return ieee754dp_nanxcpt(x, "logb", x);
  40        case IEEE754_CLASS_QNAN:
  41                return x;
  42        case IEEE754_CLASS_INF:
  43                return ieee754dp_inf(0);
  44        case IEEE754_CLASS_ZERO:
  45                return ieee754dp_inf(1);
  46        case IEEE754_CLASS_DNORM:
  47                DPDNORMX;
  48                break;
  49        case IEEE754_CLASS_NORM:
  50                break;
  51        }
  52        return ieee754dp_fint(xe);
  53}
  54