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/* @(#)e_scalb.c 5.1 93/09/24 */
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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#ifndef lint
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static char rcsid[] = "$\Id: e_scalb.c,v 1.2.6.1 1997/02/23 11:03:08 joerg Exp $";
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#endif
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/*
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 * __ieee754_scalb(x, fn) is provide for
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 * passing various standard test suite. One
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 * should use scalbn() instead.
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 */
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#include "math.h"
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#include "math_private.h"
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#ifdef _SCALB_INT
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#ifdef __STDC__
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        double __generic___ieee754_scalb(double x, int fn)
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#else
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        double __generic___ieee754_scalb(x,fn)
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        double x; int fn;
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#endif
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#else
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#ifdef __STDC__
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        double __generic___ieee754_scalb(double x, double fn)
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#else
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        double __generic___ieee754_scalb(x,fn)
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        double x, fn;
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#endif
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#endif
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{
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#ifdef _SCALB_INT
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        return scalbn(x,fn);
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#else
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        if (isnan(x)||isnan(fn)) return x*fn;
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        if (!finite(fn)) {
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            if(fn>0.0) return x*fn;
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            else       return x/(-fn);
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        }
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        if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
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        if ( fn > 65000.0) return scalbn(x, 65000);
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        if (-fn > 65000.0) return scalbn(x,-65000);
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        return scalbn(x,(int)fn);
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#endif
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}