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