56 lines
2.7 KiB
C++
56 lines
2.7 KiB
C++
/*
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* ICE / OPCODE - Optimized Collision Detection
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* http://www.codercorner.com/Opcode.htm
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*
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* Copyright (c) 2001-2008 Pierre Terdiman, pierre@codercorner.com
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Contains misc. useful macros & defines.
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* \file IceUtils.cpp
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* \author Pierre Terdiman (collected from various sources)
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* \date April, 4, 2000
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Precompiled Header
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#include "Stdafx.h"
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using namespace Opcode;
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Returns the alignment of the input address.
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* \fn Alignment()
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* \param address [in] address to check
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* \return the best alignment (e.g. 1 for odd addresses, etc)
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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udword IceCore::Alignment(udword address)
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{
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// Returns 0 for null addresses
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if(!address) return 0;
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// Test all bits
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udword Align = 1;
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for(udword i=1;i<32;i++)
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{
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// Returns as soon as the alignment is broken
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if(address&Align) return Align;
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Align<<=1;
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}
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// Here all bits are null, except the highest one (else the address would be null)
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return Align;
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}
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