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
20 float
21 scalbf(float x, int fn)
22 {
23 	return scalbnf(x,fn);
24 }
25 
26 #else
27 
28 float
29 scalbf(float x, float fn)
30 {
31 	if (isnanf(x)||isnanf(fn)) return x*fn;
32 	if (!finitef(fn)) {
33 	    if(fn>(float)0.0) return x*fn;
34 	    else       return x/(-fn);
35 	}
36 	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
37 	if ( fn > (float)65000.0) return scalbnf(x, 65000);
38 	if (-fn > (float)65000.0) return scalbnf(x,-65000);
39 	return scalbnf(x,(int)fn);
40 }
41 #endif
42