1 /* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */
2 /*
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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 #define _GNU_SOURCE
17 #include <math.h>
18
scalbf(float x,float fn)19 float scalbf(float x, float fn)
20 {
21 if (isnan(x) || isnan(fn)) return x*fn;
22 if (!isfinite(fn)) {
23 if (fn > 0.0f)
24 return x*fn;
25 else
26 return x/(-fn);
27 }
28 if (rintf(fn) != fn) return (fn-fn)/(fn-fn);
29 if ( fn > 65000.0f) return scalbnf(x, 65000);
30 if (-fn > 65000.0f) return scalbnf(x,-65000);
31 return scalbnf(x,(int)fn);
32 }
33