linux/arch/mips/math-emu/sp_simple.c
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   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
  30int ieee754sp_finite(ieee754sp x)
  31{
  32        return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS;
  33}
  34
  35ieee754sp ieee754sp_copysign(ieee754sp x, ieee754sp y)
  36{
  37        CLEARCX;
  38        SPSIGN(x) = SPSIGN(y);
  39        return x;
  40}
  41
  42
  43ieee754sp ieee754sp_neg(ieee754sp x)
  44{
  45        COMPXSP;
  46
  47        EXPLODEXSP;
  48        CLEARCX;
  49        FLUSHXSP;
  50
  51        /*
  52         * Invert the sign ALWAYS to prevent an endless recursion on
  53         * pow() in libc.
  54         */
  55        /* quick fix up */
  56        SPSIGN(x) ^= 1;
  57
  58        if (xc == IEEE754_CLASS_SNAN) {
  59                ieee754sp y = ieee754sp_indef();
  60                SETCX(IEEE754_INVALID_OPERATION);
  61                SPSIGN(y) = SPSIGN(x);
  62                return ieee754sp_nanxcpt(y, "neg");
  63        }
  64
  65        return x;
  66}
  67
  68
  69ieee754sp ieee754sp_abs(ieee754sp x)
  70{
  71        COMPXSP;
  72
  73        EXPLODEXSP;
  74        CLEARCX;
  75        FLUSHXSP;
  76
  77        /* Clear sign ALWAYS, irrespective of NaN */
  78        SPSIGN(x) = 0;
  79
  80        if (xc == IEEE754_CLASS_SNAN) {
  81                return ieee754sp_nanxcpt(ieee754sp_indef(), "abs");
  82        }
  83
  84        return x;
  85}
  86