author | jjkang |
Fri, 11 Jun 2010 15:22:09 +0800 | |
changeset 2 | 806186ab5e14 |
parent 1 | 0a7b44b10206 |
permissions | -rw-r--r-- |
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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32\euser\maths\um_spec.cpp |
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// Functions to check for and set special values |
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// |
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// |
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// |
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#include "um_std.h" |
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#ifndef __REALS_MACHINE_CODED__ |
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EXPORT_C TBool Math::IsZero(const TReal &aVal) |
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/** |
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Determines whether a value is zero. |
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@param aVal A reference to the value to be checked. |
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@return True, if aVal is zero; false, otherwise. |
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*/ |
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{ |
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|
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SReal64 *pS=(SReal64 *)&aVal; |
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if (pS->msm==0U && pS->lsm==0U && pS->exp==(unsigned)KTReal64ZeroExponent) |
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return TRUE; |
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else |
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return FALSE; |
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} |
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EXPORT_C TBool Math::IsNaN(const TReal &aVal) |
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/** |
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Determines whether a value is not a number. |
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@param aVal A reference to the value to be checked. |
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@return True, if aVal is not a number; false, otherwise. |
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*/ |
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{ |
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SReal64 *pS=(SReal64 *)&aVal; |
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if (pS->exp==(unsigned)KTReal64SpecialExponent && (pS->msm|pS->lsm)!= 0U) |
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return TRUE; |
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else |
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return FALSE; |
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} |
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EXPORT_C TBool Math::IsInfinite(const TReal &aVal) |
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/** |
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Determines whether a value is infinite. |
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@param aVal A reference to the value to be checked. |
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@return True, if aVal is infinite; false, otherwise. |
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*/ |
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{ |
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SReal64 *pS=(SReal64 *)&aVal; |
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if (pS->msm==0U && pS->lsm==0U && pS->exp==(unsigned)KTReal64SpecialExponent) |
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return TRUE; |
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else |
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return FALSE; |
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} |
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EXPORT_C TBool Math::IsFinite(const TReal &aVal) |
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/** |
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Determines whether a value is finite. |
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In this context, a value is finite if it is a valid number and |
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is not infinite. |
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@param aVal A reference to the value to be checked. |
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@return True, if aVal is finite; false, otherwise. |
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*/ |
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{ |
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SReal64 *pS=(SReal64 *)&aVal; |
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if (pS->exp!=(unsigned)KTReal64SpecialExponent) |
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return TRUE; |
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else |
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return FALSE; |
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} |
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EXPORT_C void Math::SetZero(TReal &aVal,TInt aSign) |
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// |
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// Constructs zeros, assuming default sign is positive |
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// |
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{ |
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|
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SReal64 *pS=(SReal64 *)&aVal; |
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pS->sign=aSign; |
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pS->exp=KTReal64ZeroExponent; |
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pS->msm=0; |
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pS->lsm=0; |
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} |
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EXPORT_C void Math::SetNaN(TReal &aVal) |
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// |
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// Constructs NaN (+ve sign for Java) |
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// |
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{ |
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SReal64 *pS=(SReal64 *)&aVal; |
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pS->sign=0; |
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pS->exp=KTReal64SpecialExponent; |
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pS->msm=0xfffffu; |
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pS->lsm=0xffffffffu; |
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} |
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EXPORT_C void Math::SetInfinite(TReal &aVal,TInt aSign) |
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// |
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// Constructs infinities |
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// |
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{ |
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SReal64 *pS=(SReal64 *)&aVal; |
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pS->sign=aSign; |
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pS->exp=KTReal64SpecialExponent; |
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pS->msm=0; |
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pS->lsm=0; |
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} |
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#endif |
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159 |