NetBSD-5.0.2/lib/libm/src/e_scalbf.c

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/* e_scalbf.c -- float version of e_scalb.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: e_scalbf.c,v 1.6 2002/05/26 22:01:52 wiz Exp $");
#endif

#include "math.h"
#include "math_private.h"

#ifdef _SCALB_INT
float
__ieee754_scalbf(float x, int fn)
#else
float
__ieee754_scalbf(float x, float fn)
#endif
{
#ifdef _SCALB_INT
	return scalbnf(x,fn);
#else
	if (isnanf(x)||isnanf(fn)) return x*fn;
	if (!finitef(fn)) {
	    if(fn>(float)0.0) return x*fn;
	    else       return x/(-fn);
	}
	if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
	if ( fn > (float)65000.0) return scalbnf(x, 65000);
	if (-fn > (float)65000.0) return scalbnf(x,-65000);
	return scalbnf(x,(int)fn);
#endif
}