/*--------------------------------------------------------------------

 *© Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *--------------------------------------------------------------------

*/

/* s_logbf.c -- float version of s_logb.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.

 * ====================================================

 */

#ifndef __SYMBIAN32__

#ifndef lint

static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_logbf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";

#endif

#endif //__SYMBIAN32__

#include <math.h>

#include "math_private.h"

EXPORT_C float

logbf(float x)

{

	int32_t ix;

	GET_FLOAT_WORD(ix,x);

	ix &= 0x7fffffff;			/* high |x| */

	if(ix==0) return (float)-1.0/fabsf(x);

	if(ix>=0x7f800000) return x*x;

	if((ix>>=23)==0) 			/* IEEE 754 logb */

		return -126.0;

	else

		return (float) (ix-127);

}