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81 lines
2.0 KiB
81 lines
2.0 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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/***************************************************************************** |
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* |
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* $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtMath.cpp |
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* |
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***/ |
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#include "../Pch.h" |
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#pragma hdrstop |
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/***************************************************************************** |
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* |
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* Exported bit manipulation functions |
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* |
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***/ |
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//=========================================================================== |
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#ifndef _M_IX86 |
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unsigned MathHighBitPos (dword val) { |
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ASSERT(val); |
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double f = (double)val; |
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return (*((dword *)&f + 1) >> 20) - 1023; |
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} |
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#else |
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__declspec(naked) unsigned __fastcall MathHighBitPos (dword) { |
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__asm { |
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bsr eax, ecx |
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ret 0 |
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}; |
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} |
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#endif |
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//=========================================================================== |
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#ifndef _M_IX86 |
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unsigned MathLowBitPos (dword val) { |
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val &= ~(val - 1); // clear all but the low bit |
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ASSERT(val); |
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double f = (double)val; |
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return (*((dword *)&f + 1) >> 20) - 1023; |
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} |
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#else |
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__declspec(naked) unsigned __fastcall MathLowBitPos (dword) { |
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__asm { |
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bsf eax, ecx |
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ret 0 |
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}; |
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} |
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#endif
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