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 #if defined(LIBM_SCCS) && !defined(lint)
18 __RCSID("$NetBSD: e_scalbf.c,v 1.7 2010/04/23 19:17:07 drochner Exp $");
19 #endif
20
21 #include "namespace.h"
22 #include "math.h"
23 #include "math_private.h"
24
25 #ifdef _SCALB_INT
26 float
__ieee754_scalbf(float x,int fn)27 __ieee754_scalbf(float x, int fn)
28 #else
29 float
30 __ieee754_scalbf(float x, float fn)
31 #endif
32 {
33 #ifdef _SCALB_INT
34 return scalbnf(x,fn);
35 #else
36 if (isnanf(x)||isnanf(fn)) return x*fn;
37 if (!finitef(fn)) {
38 if(fn>(float)0.0) return x*fn;
39 else return x/(-fn);
40 }
41 if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
42 if ( fn > (float)65000.0) return scalbnf(x, 65000);
43 if (-fn > (float)65000.0) return scalbnf(x,-65000);
44 return scalbnf(x,(int)fn);
45 #endif
46 }
47