/*
 * $Id: math_fmodf.c,v 1.2 2005-05-29 14:45:32 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * PowerPC math library based in part on work by Sun Microsystems
 * 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.
 *
 *
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

#ifndef _MATH_HEADERS_H
#include "math_headers.h"
#endif /* _MATH_HEADERS_H */

/****************************************************************************/

#if defined(FLOATING_POINT_SUPPORT)

/****************************************************************************/

static const float one = 1.0;

float
modff(float x, float *iptr)
{
	LONG i0,j_0;
	ULONG i;
	GET_FLOAT_WORD(i0,x);
	j_0 = ((i0>>23)&0xff)-0x7f;	/* exponent of x */
	if(j_0<23) {			/* integer part in x */
	    if(j_0<0) {			/* |x|<1 */
	        SET_FLOAT_WORD(*iptr,i0&0x80000000U);	/* *iptr = +-0 */
		return x;
	    } else {
		i = (0x007fffff)>>j_0;
		if((i0&i)==0) {			/* x is integral */
		    ULONG ix;
		    *iptr = x;
		    GET_FLOAT_WORD(ix,x);
		    SET_FLOAT_WORD(x,ix&0x80000000U);	/* return +-0 */
		    return x;
		} else {
		    SET_FLOAT_WORD(*iptr,i0&(~i));
		    return x - *iptr;
		}
	    }
	} else {			/* no fraction part */
	    ULONG ix;
	    *iptr = x*one;
	    GET_FLOAT_WORD(ix,x);
	    SET_FLOAT_WORD(x,ix&0x80000000U);	/* return +-0 */
	    return x;
	}
}

/****************************************************************************/

#endif /* FLOATING_POINT_SUPPORT */
