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 <sys/cdefs.h>
17 __FBSDID("$FreeBSD$");
18
19 #include "math.h"
20 #include "math_private.h"
21
22 #ifdef _SCALB_INT
23 float
__ieee754_scalbf(float x,int fn)24 __ieee754_scalbf(float x, int fn)
25 #else
26 float
27 __ieee754_scalbf(float x, float fn)
28 #endif
29 {
30 #ifdef _SCALB_INT
31 return scalbnf(x,fn);
32 #else
33 if ((isnanf)(x)||(isnanf)(fn)) return x*fn;
34 if (!finitef(fn)) {
35 if(fn>(float)0.0) return x*fn;
36 else return x/(-fn);
37 }
38 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
39 if ( fn > (float)65000.0) return scalbnf(x, 65000);
40 if (-fn > (float)65000.0) return scalbnf(x,-65000);
41 return scalbnf(x,(int)fn);
42 #endif
43 }
44