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dp_simple.c

/* IEEE754 floating point arithmetic
 * double precision: common utilities
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 * http://www.algor.co.uk
 *
 * ########################################################################
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * ########################################################################
 */


#include "ieee754dp.h"

int ieee754dp_finite(ieee754dp x)
{
      return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS;
}

ieee754dp ieee754dp_copysign(ieee754dp x, ieee754dp y)
{
      CLEARCX;
      DPSIGN(x) = DPSIGN(y);
      return x;
}


ieee754dp ieee754dp_neg(ieee754dp x)
{
      COMPXDP;

      EXPLODEXDP;
      CLEARCX;
      FLUSHXDP;

      /*
       * Invert the sign ALWAYS to prevent an endless recursion on
       * pow() in libc.
       */
      /* quick fix up */
      DPSIGN(x) ^= 1;

      if (xc == IEEE754_CLASS_SNAN) {
            ieee754dp y = ieee754dp_indef();
            SETCX(IEEE754_INVALID_OPERATION);
            DPSIGN(y) = DPSIGN(x);
            return ieee754dp_nanxcpt(y, "neg");
      }

      if (ieee754dp_isnan(x)) /* but not infinity */
            return ieee754dp_nanxcpt(x, "neg", x);
      return x;
}


ieee754dp ieee754dp_abs(ieee754dp x)
{
      COMPXDP;

      EXPLODEXDP;
      CLEARCX;
      FLUSHXDP;

      if (xc == IEEE754_CLASS_SNAN) {
            SETCX(IEEE754_INVALID_OPERATION);
            return ieee754dp_nanxcpt(ieee754dp_indef(), "neg");
      }

      if (ieee754dp_isnan(x)) /* but not infinity */
            return ieee754dp_nanxcpt(x, "abs", x);

      /* quick fix up */
      DPSIGN(x) = 0;
      return x;
}

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