File: exp2ap.cc

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/*
    Copyright (C) 2004-2009 Fons Adriaensen <fons@kokkinizita.net>
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include <math.h>


float exp2ap (float x)
{
    int i;

    i = (int)(floorf (x));
    x -= i;
    return ldexpf (1 + x * (0.6930f + x * (0.2416f + x * (0.0517f + x * 0.0137f))), i);
}