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94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/*
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* $Id$
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* PowerPC math library based in part on work by Sun Microsystems
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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*
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*
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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#ifndef _MATH_HEADERS_H
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#include "math_headers.h"
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#endif /* _MATH_HEADERS_H */
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/****************************************************************************/
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#if defined(FLOATING_POINT_SUPPORT)
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/****************************************************************************/
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static const float one = 1.0;
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float
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modff(float x, float *iptr)
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{
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LONG i0,j_0;
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ULONG i;
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GET_FLOAT_WORD(i0,x);
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j_0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */
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if(j_0<23) { /* integer part in x */
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if(j_0<0) { /* |x|<1 */
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SET_FLOAT_WORD(*iptr,i0&0x80000000U); /* *iptr = +-0 */
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return x;
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} else {
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i = (0x007fffff)>>j_0;
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if((i0&i)==0) { /* x is integral */
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ULONG ix;
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*iptr = x;
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GET_FLOAT_WORD(ix,x);
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SET_FLOAT_WORD(x,ix&0x80000000U); /* return +-0 */
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return x;
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} else {
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SET_FLOAT_WORD(*iptr,i0&(~i));
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return x - *iptr;
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}
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}
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} else { /* no fraction part */
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ULONG ix;
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*iptr = x*one;
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GET_FLOAT_WORD(ix,x);
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SET_FLOAT_WORD(x,ix&0x80000000U); /* return +-0 */
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return x;
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}
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}
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/****************************************************************************/
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#endif /* FLOATING_POINT_SUPPORT */
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