author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 15:26:22 +0300 | |
changeset 34 | 5fae379060a7 |
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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/* s_logbf.c -- float version of s_logb.c. |
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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*/ |
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|
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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 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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#ifndef __SYMBIAN32__ |
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#ifndef lint |
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static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_logbf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; |
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#endif |
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#endif //__SYMBIAN32__ |
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|
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#include <math.h> |
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#include "math_private.h" |
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|
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EXPORT_C float |
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logbf(float x) |
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{ |
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int32_t ix; |
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GET_FLOAT_WORD(ix,x); |
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ix &= 0x7fffffff; /* high |x| */ |
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if(ix==0) return (float)-1.0/fabsf(x); |
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if(ix>=0x7f800000) return x*x; |
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if((ix>>=23)==0) /* IEEE 754 logb */ |
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return -126.0; |
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else |
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return (float) (ix-127); |
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} |