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/*==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/>.
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.h
*
***/
#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTMATH_H
#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtMath.h included more than once"
#endif
#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTMATH_H
/*****************************************************************************
*
* Calling conventions
*
***/
#ifdef _M_IX86
#define MATHCALL __fastcall
#else
#define MATHCALL
#endif
/*****************************************************************************
*
* Bit manipulation functions
*
***/
unsigned MATHCALL MathLowBitPos (dword val);
unsigned MATHCALL MathHighBitPos (dword val);
//===========================================================================
inline unsigned MathBitCount (dword val) {
val = val - ((val >> 1) & 033333333333) - ((val >> 2) & 011111111111);
val = ((val + (val >> 3)) & 030707070707);
val = val + (val >> 6);
val = (val + (val >> 12) + (val >> 24)) & 077;
return val;
}
//===========================================================================
inline unsigned MathBitMaskCreate (unsigned count) {
ASSERT(count <= 8 * sizeof(unsigned));
return count ? ((2 << (count - 1)) - 1) : 0;
}
//===========================================================================
inline dword MathHighBitValue (dword val) {
return val ? 1 << MathHighBitPos(val) : 0;
}
//===========================================================================
inline bool MathIsPow2 (unsigned val) {
return !(val & (val - 1));
}
//===========================================================================
inline unsigned MathLowBitValue (unsigned val) {
return val & ~(val - 1);
}
//===========================================================================
inline unsigned MathNextMultiplePow2 (unsigned val, unsigned multiple) {
ASSERT(multiple);
ASSERT(MathIsPow2(multiple));
return (val + (multiple - 1)) & ~(multiple - 1);
}
//===========================================================================
inline dword MathNextPow2 (dword val) {
return MathIsPow2(val) ? val : 1 << (MathHighBitPos(val) + 1);
}