Mega Code Archive
Count the number of bit
<![CDATA[
//http://extensionlibrary.codeplex.com/
//The MIT License (MIT)
using System;
using System.Collections.Generic;
using System.Text;
namespace ExtensionLibrary.Tools
{
public static class BitOperator
{
#region Count the number of bit one
public static int GetCountOfBitOne(sbyte x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (sbyte)(x - 1);
}
return result;
}
public static int GetCountOfBitOne(short x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (short)(x - 1);
}
return result;
}
public static int GetCountOfBitOne(int x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (x - 1);
}
return result;
}
public static int GetCountOfBitOne(long x)
{
int result = 0;
while (x!=0)
{
result++;
x &= (x - 1);
}
return result;
}
public static int GetCountOfBitOne(byte x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (byte)(x - 1);
}
return result;
}
public static int GetCountOfBitOne(ushort x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (ushort)(x - 1);
}
return result;
}
public static int GetCountOfBitOne(uint x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (x - 1);
}
return result;
}
public static int GetCountOfBitOne(ulong x)
{
int result = 0;
while (x != 0)
{
result++;
x &= (x - 1);
}
return result;
}
#endregion
#region Count the number of bit zero
public static int GetCountOfBitZero(sbyte x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(short x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(int x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(long x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(byte x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(ushort x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(uint x)
{
return GetCountOfBitOne(~x);
}
public static int GetCountOfBitZero(ulong x)
{
return GetCountOfBitOne(~x);
}
#endregion
#region Get number of leading zero
public static int GetNumberOfLeadingZero(sbyte x)
{
int number = 8;
sbyte y = (sbyte)(x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (sbyte)(x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (sbyte)(x >> 1);
if (y != 0)
{
return number - 2;
}
return number - x;
}
public static int GetNumberOfLeadingZero(short x)
{
int number = 16;
short y = (short)(x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (short)(x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (short)(x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (short)(x >> 1);
if (y != 0)
{
return number - 2;
}
return number - x;
}
public static int GetNumberOfLeadingZero(int x)
{
int number = 32;
int y = (x >> 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x >> 1);
if (y != 0)
{
return number - 2;
}
return number - x;
}
public static int GetNumberOfLeadingZero(long x)
{
int number = 64;
long y = (x >> 32);
if (y != 0)
{
number -= 32;
x = y;
}
y = (x >> 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x >> 1);
if (y != 0)
{
return number - 2;
}
return (int)(number - x);
}
public static int GetNumberOfLeadingZero(byte x)
{
int number = 8;
byte y = (byte)(x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (byte)(x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (byte)(x >> 1);
if (y != 0)
{
return number - 2;
}
return number - x;
}
public static int GetNumberOfLeadingZero(ushort x)
{
int number = 16;
ushort y = (ushort)(x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (ushort)(x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (ushort)(x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (ushort)(x >> 1);
if (y != 0)
{
return number - 2;
}
return number - x;
}
public static int GetNumberOfLeadingZero(uint x)
{
int number = 32;
uint y = (x >> 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x >> 1);
if (y != 0)
{
return number - 2;
}
return (int)(number - x);
}
public static int GetNumberOfLeadingZero(ulong x)
{
int number = 64;
ulong y = (x >> 32);
if (y != 0)
{
number -= 32;
x = y;
}
y = (x >> 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x >> 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x >> 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x >> 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x >> 1);
if (y != 0)
{
return number - 2;
}
return number - (int)x;
}
#endregion
#region Get number of leading one
public static int GetNumberOfLeadingOne(sbyte x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(short x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(int x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(long x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(byte x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(ushort x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(uint x)
{
return GetNumberOfLeadingZero(~x);
}
public static int GetNumberOfLeadingOne(ulong x)
{
return GetNumberOfLeadingZero(~x);
}
#endregion
#region Get number of tailing zero
public static int GetNumberOfTailingZero(sbyte x)
{
if (x == 0)
return 8;
int number = 7;
sbyte y = (sbyte)(x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (sbyte)(x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (sbyte)(x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(short x)
{
if (x == 0)
return 16;
int number = 15;
short y = (short)(x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (short)(x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (short)(x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (short)(x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(int x)
{
if (x == 0)
return 32;
int number = 31;
int y = (x << 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(long x)
{
if (x == 0)
return 64;
int number = 63;
long y = (x << 32);
if (y != 0)
{
number -= 32;
x = y;
}
y = (x << 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(byte x)
{
if (x == 0)
return 8;
int number = 7;
byte y = (byte)(x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (byte)(x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (byte)(x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(ushort x)
{
if (x == 0)
return 16;
int number = 15;
ushort y = (ushort)(x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (ushort)(x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (ushort)(x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (ushort)(x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(uint x)
{
if (x == 0)
return 32;
int number = 31;
uint y = (x << 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x << 1);
if (y != 0)
{
number--;
}
return number;
}
public static int GetNumberOfTailingZero(ulong x)
{
if (x == 0)
return 64;
int number = 63;
ulong y = (x << 32);
if (y != 0)
{
number -= 32;
x = y;
}
y = (x << 16);
if (y != 0)
{
number -= 16;
x = y;
}
y = (x << 8);
if (y != 0)
{
number -= 8;
x = y;
}
y = (x << 4);
if (y != 0)
{
number -= 4;
x = y;
}
y = (x << 2);
if (y != 0)
{
number -= 2;
x = y;
}
y = (x << 1);
if (y != 0)
{
number--;
}
return number;
}
#endregion
#region Get number of tailing one
public static int GetNumberOfTailingOne(sbyte x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(short x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(int x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(long x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(byte x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(ushort x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(uint x)
{
return GetNumberOfTailingOne(~x);
}
public static int GetNumberOfTailingOne(ulong x)
{
return GetNumberOfTailingOne(~x);
}
#endregion
}
}
]]>