/*========================================================================
//
//      single/portable-api/sf_floor.c
//
//      Part of the standard mathematical function library
//
//========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
// Copyright (C) 2004 eCosCentric Limited                                   
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
// Software Foundation; either version 2 or (at your option) any later      
// version.                                                                 
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
// for more details.                                                        
//
// You should have received a copy of the GNU General Public License        
// along with eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
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// ####ECOSGPLCOPYRIGHTEND####                                              
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     jlarmour
// Contributors:  
// Date:          2004-02-30
// Purpose:       
// Description:   Derived from newlib libm
//                http://sources.redhat.com/newlib
//                in turn based on SunSoft fdlibm.
//                See copyright/license information below.
// Usage:         #include <math.h>
//
//####DESCRIPTIONEND####
//======================================================================*/

/* sf_floor.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.
 * ====================================================
 */

/*
 * 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 "mathincl/fdlibm.h"

#ifdef __STDC__
static const float huge = 1.0e30;
#else
static float huge = 1.0e30;
#endif

#ifdef __STDC__
	float floorf(float x)
#else
	float floorf(x)
	float x;
#endif
{
	__int32_t i0,j0;
	__uint32_t i,ix;
	GET_FLOAT_WORD(i0,x);
	ix = (i0&0x7fffffff);
	j0 = (ix>>23)-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(!FLT_UWORD_IS_ZERO(ix))
			{ 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(!FLT_UWORD_IS_FINITE(ix)) return x+x;	/* inf or NaN */
	    else return x;		/* x is integral */
	}
	SET_FLOAT_WORD(x,i0);
	return x;
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
	double floor(double x)
#else
	double floor(x)
	double x;
#endif
{
	return (double) floorf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */

// EOF sf_floor.c
