1df930be7Sderaadt /* @(#)e_scalb.c 5.1 93/09/24 */
2df930be7Sderaadt /*
3df930be7Sderaadt * ====================================================
4df930be7Sderaadt * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5df930be7Sderaadt *
6df930be7Sderaadt * Developed at SunPro, a Sun Microsystems, Inc. business.
7df930be7Sderaadt * Permission to use, copy, modify, and distribute this
8df930be7Sderaadt * software is freely granted, provided that this notice
9df930be7Sderaadt * is preserved.
10df930be7Sderaadt * ====================================================
11df930be7Sderaadt */
12df930be7Sderaadt
13df930be7Sderaadt /*
147b36286aSmartynas * scalb(x, fn) is provide for
15df930be7Sderaadt * passing various standard test suite. One
16df930be7Sderaadt * should use scalbn() instead.
17df930be7Sderaadt */
18df930be7Sderaadt
19df930be7Sderaadt #include "math.h"
20df930be7Sderaadt #include "math_private.h"
21df930be7Sderaadt
22df930be7Sderaadt #ifdef _SCALB_INT
23e7beb4a7Smillert double
scalb(double x,int fn)247b36286aSmartynas scalb(double x, int fn)
25df930be7Sderaadt {
26df930be7Sderaadt return scalbn(x, fn);
27e7beb4a7Smillert }
28*2f2c0062Sguenther DEF_NONSTD(scalb);
29e7beb4a7Smillert
30df930be7Sderaadt #else
31e7beb4a7Smillert
32e7beb4a7Smillert double
scalb(double x,double fn)337b36286aSmartynas scalb(double x, double fn)
34e7beb4a7Smillert {
35df930be7Sderaadt if (isnan(x)||isnan(fn)) return x*fn;
36eab01a26Sguenther if (!isfinite(fn)) {
37df930be7Sderaadt if(fn>0.0) return x*fn;
38df930be7Sderaadt else return x/(-fn);
39df930be7Sderaadt }
40df930be7Sderaadt if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
41df930be7Sderaadt if ( fn > 65000.0) return scalbn(x, 65000);
42df930be7Sderaadt if (-fn > 65000.0) return scalbn(x,-65000);
43df930be7Sderaadt return scalbn(x,(int)fn);
44df930be7Sderaadt }
45*2f2c0062Sguenther DEF_NONSTD(scalb);
46e7beb4a7Smillert #endif
47