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dp_fsp.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"

ieee754dp ieee754dp_fsp(ieee754sp x)
{
      COMPXSP;

      EXPLODEXSP;

      CLEARCX;

      FLUSHXSP;

      switch (xc) {
      case IEEE754_CLASS_SNAN:
            SETCX(IEEE754_INVALID_OPERATION);
            return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp");
      case IEEE754_CLASS_QNAN:
            return ieee754dp_nanxcpt(builddp(xs,
                                     DP_EMAX + 1 + DP_EBIAS,
                                     ((u64) xm
                                      << (DP_MBITS -
                                          SP_MBITS))), "fsp",
                               x);
      case IEEE754_CLASS_INF:
            return ieee754dp_inf(xs);
      case IEEE754_CLASS_ZERO:
            return ieee754dp_zero(xs);
      case IEEE754_CLASS_DNORM:
            /* normalize */
            while ((xm >> SP_MBITS) == 0) {
                  xm <<= 1;
                  xe--;
            }
            break;
      case IEEE754_CLASS_NORM:
            break;
      }

      /* CANT possibly overflow,underflow, or need rounding
       */

      /* drop the hidden bit */
      xm &= ~SP_HIDDEN_BIT;

      return builddp(xs, xe + DP_EBIAS,
                   (u64) xm << (DP_MBITS - SP_MBITS));
}

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