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f9e782d358
file but were still unimplemented up until now. - Replaced ldexp() and modf(). git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15045 87f5fb63-7c3d-0410-a384-fd976d0f7a62
168 lines
4.6 KiB
C
168 lines
4.6 KiB
C
/*
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* $Id: math_modf.c,v 1.6 2005-10-16 09:05:02 obarthel Exp $
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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) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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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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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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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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#if defined(M68881_FLOATING_POINT_SUPPORT)
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/****************************************************************************/
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INLINE STATIC const double
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__modf(double x,double *nptr)
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{
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double result;
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double temp;
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__asm ("fintrz%.x %1,%0"
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: "=f" (temp) /* integer-valued float */
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: "f" (x));
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(*nptr) = temp;
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result = x - temp;
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return(result);
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}
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/****************************************************************************/
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#else
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/****************************************************************************/
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static const double one = 1.0;
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INLINE STATIC double
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__modf(double x, double *iptr)
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{
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LONG i0,i1,j0;
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ULONG i;
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EXTRACT_WORDS(i0,i1,x);
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j0 = ((i0>>20)&0x7ff)-0x3ff; /* exponent of x */
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if(j0<20) { /* integer part in high x */
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if(j0<0) { /* |x|<1 */
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INSERT_WORDS(*iptr,i0&0x80000000,0); /* *iptr = +-0 */
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return x;
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} else {
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i = (0x000fffff)>>j0;
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if(((i0&i)|i1)==0) { /* x is integral */
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ULONG high;
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*iptr = x;
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GET_HIGH_WORD(high,x);
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INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
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return x;
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} else {
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INSERT_WORDS(*iptr,i0&(~i),0);
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return x - *iptr;
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}
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}
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} else if (j0>51) { /* no fraction part */
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ULONG high;
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*iptr = x*one;
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GET_HIGH_WORD(high,x);
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INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
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return x;
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} else { /* fraction part in low x */
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i = ((ULONG)(0xffffffff))>>(j0-20);
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if((i1&i)==0) { /* x is integral */
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ULONG high;
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*iptr = x;
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GET_HIGH_WORD(high,x);
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INSERT_WORDS(x,high&0x80000000,0); /* return +-0 */
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return x;
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} else {
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INSERT_WORDS(*iptr,i0,i1&(~i));
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return x - *iptr;
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}
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}
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}
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/****************************************************************************/
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#endif /* M68881_FLOATING_POINT_SUPPORT */
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/****************************************************************************/
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double
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modf(double x,double *nptr)
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{
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double result;
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assert( nptr != NULL );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(nptr == NULL)
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{
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__set_errno(EFAULT);
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result = __get_huge_val();
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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result = __modf(x,nptr);
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out:
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return(result);
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}
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/****************************************************************************/
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#endif /* FLOATING_POINT_SUPPORT */
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