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82 lines
2.0 KiB
82 lines
2.0 KiB
14 years ago
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/*==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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