You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
2.9 KiB
97 lines
2.9 KiB
/*==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 <http://www.gnu.org/licenses/>. |
|
|
|
Additional permissions under GNU GPL version 3 section 7 |
|
|
|
If you modify this Program, or any covered work, by linking or |
|
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
|
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
|
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
|
(or a modified version of those libraries), |
|
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
|
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
|
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
|
licensors of this Program grant you additional |
|
permission to convey the resulting work. Corresponding Source for a |
|
non-source form of such a combination shall include the source code for |
|
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
|
work. |
|
|
|
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
|
|
|