e_scalbf.c revision 1.1 
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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: e_scalbf.c,v 1.3 1995/05/10 20:46:12 jtc Exp $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23#ifdef _SCALB_INT
24#ifdef __STDC__
25	float __ieee754_scalbf(float x, int fn)
26#else
27	float __ieee754_scalbf(x,fn)
28	float x; int fn;
29#endif
30#else
31#ifdef __STDC__
32	float __ieee754_scalbf(float x, float fn)
33#else
34	float __ieee754_scalbf(x,fn)
35	float x, fn;
36#endif
37#endif
38{
39#ifdef _SCALB_INT
40	return scalbnf(x,fn);
41#else
42	if (isnanf(x)||isnanf(fn)) return x*fn;
43	if (!finitef(fn)) {
44	    if(fn>(float)0.0) return x*fn;
45	    else       return x/(-fn);
46	}
47	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
48	if ( fn > (float)65000.0) return scalbnf(x, 65000);
49	if (-fn > (float)65000.0) return scalbnf(x,-65000);
50	return scalbnf(x,(int)fn);
51#endif
52}
53