Bitwise Operations
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When dealing with integer types only, bitwise operations are in most cases faster than plain math. Because those tricks are not realy "special" I put the most common ones on this page and you should have a more detailed look at the See Also section.
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[edit] Multiplication By 2^x
A simple multiplication in the form of 2^x could be something like y * 2 or y * 4.
y *= 2^x y <<= x
[edit] Division By 2^x
A simple division in the form of 2^x could be something like y / 2 or y / 4.
y /= 2^x y >>= x
[edit] Modulo 2^x
A simple modulo in the form of 2^x could be something like y % 2 or y % 4.
y %= 2^x y &= 2^x - 1
[edit] Test If x Is Even
Testing if a a variable is even or odd has a lot of applications and can be done using bitwise operations.
isEven = 0 == (x % 2) isEven = 0 == (x & 1)
