/* @(#)e_scalb.c 5.1 93/09/24 */
/*
 * ====================================================
 * 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.
 * ====================================================
 */

/*
 * __ieee754_scalb(x, fn) is provide for
 * passing various standard test suite. One 
 * should use scalbn() instead.
 */

#include "fdlibm.h"

#ifndef _DOUBLE_IS_32BITS

#ifdef _SCALB_INT
#ifdef __STDC__
double
__ieee754_scalb (double x, int fn)
#else
double
__ieee754_scalb (x, fn)
     double x;
     int fn;
#endif
#else
#ifdef __STDC__
double
__ieee754_scalb (double x, double fn)
#else
double
__ieee754_scalb (x, fn)
     double x, fn;
#endif
#endif
{
#ifdef _SCALB_INT
  return scalbn (x, fn);
#else
  if (isnan (x) || isnan (fn))
    return x * fn;
  if (!finite (fn))
    {
      if (fn > 0.0)
	return x * fn;
      else
	return x / (-fn);
    }
  if (rint (fn) != fn)
    return (fn - fn) / (fn - fn);
  if (fn > 65000.0)
    return scalbn (x, 65000);
  if (-fn > 65000.0)
    return scalbn (x, -65000);
  return scalbn (x, (int) fn);
#endif
}

#endif /* defined(_DOUBLE_IS_32BITS) */