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Bitmanipulation Cheat Sheet by

programming

Operations

oper­ation
exam­ple
before
after
NOT
x = ~0111;
 
1000
AND
x = 0101 & 0011;
 
0001
OR
x = 0101 | 0011;
 
0111
XOR
x = 0101 ^ 0011;
 
0110
Left Shift
x = 0100 << 1;
 
1000
Right Shift
x = 0100 >> 1;
 
0010
Set bit 5
x |= (1<­<5);
0b00000000
0b00100000
Clear bit 5
x &= ~(1<<5);
0b11111111
0b11011111
Wait until bit 5 is set
while (­!(x & (1<­­<5)));
Wait until bit 5 is cleared
while (x & (1<­­<5));
Save value of bit 5 into variable
int var = x & (1<­­<5);
Test if bit 5 is set
if (x & (1<­­<5)) {...}
Toggle bit 5
x ^= (1<­­<5);
0b00000000
0b00100000
Replace modulo of power of two with AND
x % y == x & (y -1)
x % 64
x & (63)
Check if integer x is odd
if (x & 1) { ... }
Turn off the rightmost 1-bit
x = x & (x-1);
0b01011000
0b01010000
Isolate the rightmost 1-bit
x = x & (-x);
0b01110000
0b00010000
Right propagate the rightmost 1-bit
x = x | (x-1);
0b10111100
0b10111111
Isolate the rightmost 0-bit
x = ~x & (x+1);
0b01110111
0b00001000
Turn on the rightmost 0-bit.
x = x | (x+1);
0b01110111
0b01111111
Right propagate the rightmost 0-bit
x = x & (x+1);
0b01110111
0b01110000
Multiply by 2
x <<= 1;
0b00000010
0b00000100
Divide by 2
x >>= 1;
0b00000010
0b00000001
XOR swap
a ^= b; b ^= a; a ^= b;
Calculate 2^n
1 << n;
Convert letter to lowercase
x = (x | ' ');
A
a
Convert letter to uppercase
x = (x & '_');
a
A
Swap Nibbles
x = (x << 4) | (x >> 4);
0b11110000
0b00001111

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Comments

Nazime Nazime, 04:30 16 Aug 17

I really like it! *.*
I was searching for something like this :D
Thank's

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