e_scalbf.c

/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Fri Jan 30 14:41:34 2009 
 */

/* e_scalbf.c -- float version of e_scalb.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#ifdef POK_NEEDS_LIBMATH

#include <libm.h>
#include "math_private.h"

#ifdef _SCALB_INT
float
__ieee754_scalbf(float x, int fn)
#else
float
__ieee754_scalbf(float x, float fn)
#endif
{
#ifdef _SCALB_INT
        return scalbnf(x,fn);
#else
        if (isnanf(x)||isnanf(fn)) return x*fn;
        if (!finitef(fn)) {
            if(fn>(float)0.0) return x*fn;
            else       return x/(-fn);
        }
        if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
        if ( fn > (float)65000.0) return scalbnf(x, 65000);
        if (-fn > (float)65000.0) return scalbnf(x,-65000);
        return scalbnf(x,(int)fn);
#endif
}
#endif