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

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

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

*/

/* s_floorf.c -- float version of s_floor.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_floorf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";

#endif

#endif //__SYMBIAN32__

/*

 * floorf(x)

 * Return x rounded toward -inf to integral value

 * Method:

 *	Bit twiddling.

 * Exception:

 *	Inexact flag raised if x not equal to floorf(x).

 */

#include <math.h>

#include "math_private.h"

static const float huge = 1.0e30;

EXPORT_C float

floorf(float x)

{

	int32_t i0,j0;

	u_int32_t i;

	GET_FLOAT_WORD(i0,x);

	j0 = ((i0>>23)&0xff)-0x7f;

	if(j0<23) {

	    if(j0<0) { 	/* raise inexact if x != 0 */

		if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */

		    if(i0>=0) {i0=0;}

		    else if((i0&0x7fffffff)!=0)

			{ i0=0xbf800000;}

		}

	    } else {

		i = (0x007fffff)>>j0;

		if((i0&i)==0) return x; /* x is integral */

		if(huge+x>(float)0.0) {	/* raise inexact flag */

		    if(i0<0) i0 += (0x00800000)>>j0;

		    i0 &= (~i);

		}

	    }

	} else {

	    if(j0==0x80) return x+x;	/* inf or NaN */

	    else return x;		/* x is integral */

	}

	SET_FLOAT_WORD(x,i0);

	return x;

}