1 /* @(#)e_scalb.c 5.1 93/09/24 */
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
10 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: e_scalb.c,v 1.6 1995/05/10 20:46:09 jtc Exp $";
18 * __ieee754_scalb(x, fn) is provide for
19 * passing various standard test suite. One
20 * should use scalbn() instead.
24 #include "math_private.h"
26 libm_hidden_proto(scalbn)
27 libm_hidden_proto(finite)
28 libm_hidden_proto(rint)
29 libm_hidden_proto(__isnan)
33 double attribute_hidden __ieee754_scalb(double x, int fn)
35 double attribute_hidden __ieee754_scalb(x,fn)
40 double attribute_hidden __ieee754_scalb(double x, double fn)
42 double attribute_hidden __ieee754_scalb(x,fn)
50 if (isnan(x)||isnan(fn)) return x*fn;
52 if(fn>0.0) return x*fn;
55 if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
56 if ( fn > 65000.0) return scalbn(x, 65000);
57 if (-fn > 65000.0) return scalbn(x,-65000);
58 return scalbn(x,(int)fn);