Implementing Power operator

I would be surprised if that's possible. The power of 2 is trivial, but everything else is far from it. In general, even a simple multiply is pipelined to meet useful speeds(although many designs don't do that). A power operator would be extremely large and slow without any pipelining or feedback. And if your exponent is the variable, there's really no way build enough multipliers in parallel for whatever values that exponent could take.