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