author | Simon Howkins <simonh@symbian.org> |
Thu, 28 Oct 2010 12:05:33 +0100 | |
branch | RCL_3 |
changeset 78 | 5b3c983434ca |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* S_FABS.C |
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* |
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* Portions Copyright (c) 1993-2005 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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*/ |
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/* @(#)s_fabs.c 5.1 93/09/24 */ |
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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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/* |
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FUNCTION |
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<<fabs>>, <<fabsf>>---absolute value (magnitude) |
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INDEX |
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fabs |
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INDEX |
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fabsf |
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ANSI_SYNOPSIS |
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#include <math.h> |
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double fabs(double <[x]>); |
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float fabsf(float <[x]>); |
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TRAD_SYNOPSIS |
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#include <math.h> |
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double fabs(<[x]>) |
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double <[x]>; |
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float fabsf(<[x]>) |
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float <[x]>; |
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DESCRIPTION |
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<<fabs>> and <<fabsf>> calculate |
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@tex |
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$|x|$, |
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@end tex |
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the absolute value (magnitude) of the argument <[x]>, by direct |
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manipulation of the bit representation of <[x]>. |
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RETURNS |
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The calculated value is returned. No errors are detected. |
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PORTABILITY |
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<<fabs>> is ANSI. |
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<<fabsf>> is an extension. |
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*/ |
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/* |
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* fabs(x) returns the absolute value of x. |
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*/ |
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#include "FDLIBM.H" |
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/** |
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Return absolute value of floating-point. |
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Returns the absoulte value of parameter x. /x/ |
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@return Absoulte value of x. |
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@param x Floating point value. |
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*/ |
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EXPORT_C double fabs(double x) __SOFTFP |
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{ |
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__uint32_t high; |
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GET_HIGH_WORD(high,x); |
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SET_HIGH_WORD(x,high&0x7fffffff); |
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return x; |
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} |