What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?

Question

If I have some integer n, and I want to know the position of the most significant bit (that is, if the least significant bit is on the right, I want to know the position of

Answer 1

My humble method is very simple:

MSB(x) = INT[Log(x) / Log(2)]

Translation: The MSB of x is the integer value of (Log of Base x divided by the Log of Base 2).

This can easily and quickly be adapted to any programming language. Try it on your calculator to see for yourself that it works.