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sp_logb.c

/* IEEE754 floating point arithmetic
 * single precision
 */
/*
 * 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 "ieee754sp.h"

ieee754sp ieee754sp_logb(ieee754sp x)
{
      COMPXSP;

      CLEARCX;

      EXPLODEXSP;

      switch (xc) {
      case IEEE754_CLASS_SNAN:
            return ieee754sp_nanxcpt(x, "logb", x);
      case IEEE754_CLASS_QNAN:
            return x;
      case IEEE754_CLASS_INF:
            return ieee754sp_inf(0);
      case IEEE754_CLASS_ZERO:
            return ieee754sp_inf(1);
      case IEEE754_CLASS_DNORM:
            SPDNORMX;
            break;
      case IEEE754_CLASS_NORM:
            break;
      }
      return ieee754sp_fint(xe);
}

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