Fastest way to enumerate through turned on bits of an integer

Question

What\'s the fastest way to enumerate through an integer and return the exponent of each bit that is turned on? Have seen an example using << and another u

Answer 1

A lookup array for one byte's worth of bits ought to be close to the fastest you can do in safe C# code. Shift each of the 4 bytes out of the integer (casting to uint as necessary) and index into the array.

The elements of the lookup array could be an array of exponents, or, depending on what you're doing with the bits, perhaps delegates that do work.