2 /* @(#)e_scalb.c 1.3 95/01/18 */
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
11 * ====================================================
15 * scalb(x, fn) is provide for
16 * passing various standard test suite. One
17 * should use scalbn() instead.
21 #include "math_private.h"
24 scalb(double x, double fn)
26 if (isnan(x)||isnan(fn)) return x*fn;
28 if(fn>0.0) return x*fn;
31 if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
32 if ( fn > 65000.0) return scalbn(x, 65000);
33 if (-fn > 65000.0) return scalbn(x,-65000);
34 return scalbn(x,(int)fn);