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 #ifndef lint
17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_scalbf.c,v 1.10 2005/12/06 20:12:38 obrien Exp $";
18 #endif
19
20 #include "math.h"
21 #include "math_private.h"
22
23 #ifdef _SCALB_INT
24 float
__ieee754_scalbf(float x,int fn)25 __ieee754_scalbf(float x, int fn)
26 #else
27 float
28 __ieee754_scalbf(float x, float fn)
29 #endif
30 {
31 #ifdef _SCALB_INT
32 return scalbnf(x,fn);
33 #else
34 if ((isnanf)(x)||(isnanf)(fn)) return x*fn;
35 if (!finitef(fn)) {
36 if(fn>(float)0.0) return x*fn;
37 else return x/(-fn);
38 }
39 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
40 if ( fn > (float)65000.0) return scalbnf(x, 65000);
41 if (-fn > (float)65000.0) return scalbnf(x,-65000);
42 return scalbnf(x,(int)fn);
43 #endif
44 }
45
46 __weak_reference(scalbf, ldexpf);
47