1*2fe8fb19SBen Gras /* @(#)e_scalb.c 5.1 93/09/24 */
2*2fe8fb19SBen Gras /*
3*2fe8fb19SBen Gras * ====================================================
4*2fe8fb19SBen Gras * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5*2fe8fb19SBen Gras *
6*2fe8fb19SBen Gras * Developed at SunPro, a Sun Microsystems, Inc. business.
7*2fe8fb19SBen Gras * Permission to use, copy, modify, and distribute this
8*2fe8fb19SBen Gras * software is freely granted, provided that this notice
9*2fe8fb19SBen Gras * is preserved.
10*2fe8fb19SBen Gras * ====================================================
11*2fe8fb19SBen Gras */
12*2fe8fb19SBen Gras
13*2fe8fb19SBen Gras #include <sys/cdefs.h>
14*2fe8fb19SBen Gras #if defined(LIBM_SCCS) && !defined(lint)
15*2fe8fb19SBen Gras __RCSID("$NetBSD: e_scalb.c,v 1.10 2010/04/23 19:17:07 drochner Exp $");
16*2fe8fb19SBen Gras #endif
17*2fe8fb19SBen Gras
18*2fe8fb19SBen Gras /*
19*2fe8fb19SBen Gras * __ieee754_scalb(x, fn) is provide for
20*2fe8fb19SBen Gras * passing various standard test suite. One
21*2fe8fb19SBen Gras * should use scalbn() instead.
22*2fe8fb19SBen Gras */
23*2fe8fb19SBen Gras
24*2fe8fb19SBen Gras #include "namespace.h"
25*2fe8fb19SBen Gras #include "math.h"
26*2fe8fb19SBen Gras #include "math_private.h"
27*2fe8fb19SBen Gras
28*2fe8fb19SBen Gras #ifdef _SCALB_INT
29*2fe8fb19SBen Gras double
__ieee754_scalb(double x,int fn)30*2fe8fb19SBen Gras __ieee754_scalb(double x, int fn)
31*2fe8fb19SBen Gras #else
32*2fe8fb19SBen Gras double
33*2fe8fb19SBen Gras __ieee754_scalb(double x, double fn)
34*2fe8fb19SBen Gras #endif
35*2fe8fb19SBen Gras {
36*2fe8fb19SBen Gras #ifdef _SCALB_INT
37*2fe8fb19SBen Gras return scalbn(x,fn);
38*2fe8fb19SBen Gras #else
39*2fe8fb19SBen Gras if (isnan(x)||isnan(fn)) return x*fn;
40*2fe8fb19SBen Gras if (!finite(fn)) {
41*2fe8fb19SBen Gras if(fn>0.0) return x*fn;
42*2fe8fb19SBen Gras else return x/(-fn);
43*2fe8fb19SBen Gras }
44*2fe8fb19SBen Gras if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
45*2fe8fb19SBen Gras if ( fn > 65000.0) return scalbn(x, 65000);
46*2fe8fb19SBen Gras if (-fn > 65000.0) return scalbn(x,-65000);
47*2fe8fb19SBen Gras return scalbn(x,(int)fn);
48*2fe8fb19SBen Gras #endif
49*2fe8fb19SBen Gras }
50