author | William Roberts <williamr@symbian.org> |
Thu, 22 Jul 2010 16:48:56 +0100 | |
branch | GCC_SURGE |
changeset 45 | 4b03adbd26ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/*-------------------------------------------------------------------- |
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*© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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*-------------------------------------------------------------------- |
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*/ |
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/* @(#)e_remainder.c 1.3 95/01/18 */ |
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/* |
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* ==================================================== |
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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* |
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* Developed at SunSoft, 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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#ifndef __SYMBIAN32__ |
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#ifndef lint |
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static char rcsid[] = "$FreeBSD: src/lib/msun/src/e_remainder.c,v 1.10 2005/02/04 18:26:06 das Exp $"; |
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#endif |
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#endif //__SYMBIAN32__ |
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|
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/* __ieee754_remainder(x,p) |
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* Return : |
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* returns x REM p = x - [x/p]*p as if in infinite |
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* precise arithmetic, where [x/p] is the (infinite bit) |
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* integer nearest x/p (in half way case choose the even one). |
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* Method : |
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* Based on fmod() return x-[x/p]chopped*p exactlp. |
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*/ |
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|
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#include <math.h> |
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#include "math_private.h" |
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static const double zero = 0.0; |
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|
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|
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EXPORT_C double |
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__ieee754_remainder(double x, double p) |
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{ |
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int32_t hx,hp; |
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u_int32_t sx,lx,lp; |
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double p_half; |
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|
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EXTRACT_WORDS(hx,lx,x); |
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EXTRACT_WORDS(hp,lp,p); |
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sx = hx&0x80000000; |
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hp &= 0x7fffffff; |
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hx &= 0x7fffffff; |
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|
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/* purge off exception values */ |
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if((hp|lp)==0) return (x*p)/(x*p); /* p = 0 */ |
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if((hx>=0x7ff00000)|| /* x not finite */ |
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((hp>=0x7ff00000)&& /* p is NaN */ |
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(((hp-0x7ff00000)|lp)!=0))) |
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return (x*p)/(x*p); |
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if (hp<=0x7fdfffff) x = __ieee754_fmod(x,p+p); /* now x < 2p */ |
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if (((hx-hp)|(lx-lp))==0) return zero*x; |
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x = fabs(x); |
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p = fabs(p); |
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if (hp<0x00200000) { |
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if(x+x>p) { |
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x-=p; |
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if(x+x>=p) x -= p; |
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} |
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} else { |
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p_half = 0.5*p; |
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if(x>p_half) { |
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x-=p; |
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if(x>=p_half) x -= p; |
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} |
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} |
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GET_HIGH_WORD(hx,x); |
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SET_HIGH_WORD(x,hx^sx); |
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return x; |
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} |