e_scalbf.c revision 1.6 
1/* e_scalbf.c -- float version of e_scalb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16#include "math.h"
17#include "math_private.h"
18
19#ifdef _SCALB_INT
20float
21scalbf(float x, int fn)
22{
23	return scalbnf(x,fn);
24}
25DEF_NONSTD(scalbf);
26
27#else
28
29float
30scalbf(float x, float fn)
31{
32	if (isnan(x)||isnan(fn)) return x*fn;
33	if (!isfinite(fn)) {
34	    if(fn>(float)0.0) return x*fn;
35	    else       return x/(-fn);
36	}
37	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
38	if ( fn > (float)65000.0) return scalbnf(x, 65000);
39	if (-fn > (float)65000.0) return scalbnf(x,-65000);
40	return scalbnf(x,(int)fn);
41}
42DEF_NONSTD(scalbf);
43#endif
44