e_scalbf.c revision 97413 
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
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/e_scalbf.c 97413 2002-05-28 18:15:04Z alfred $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23#ifdef _SCALB_INT
24float
25__ieee754_scalbf(float x, int fn)
26#else
27float
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