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96 lines
2.8 KiB
96 lines
2.8 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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Additional permissions under GNU GPL version 3 section 7 |
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If you modify this Program, or any covered work, by linking or |
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
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(or a modified version of those libraries), |
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
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licensors of this Program grant you additional |
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permission to convey the resulting work. Corresponding Source for a |
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non-source form of such a combination shall include the source code for |
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
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work. |
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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 "pnUtMath.h" |
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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 (uint32_t val) { |
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ASSERT(val); |
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double f = (double)val; |
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return (*((uint32_t *)&f + 1) >> 20) - 1023; |
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} |
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#else |
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__declspec(naked) unsigned __fastcall MathHighBitPos (uint32_t) { |
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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 (uint32_t 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 (*((uint32_t *)&f + 1) >> 20) - 1023; |
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} |
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#else |
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__declspec(naked) unsigned __fastcall MathLowBitPos (uint32_t) { |
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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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