Bit Shift Populate Speed As3

Note on populating a uint's bits:
The shifting left(<<) method is faster than the shift right(>>>) method.
(>>>) is faster than (<<), but setting the LEAST significant bit is
faster than setting the most significant bit.

theUint = theUint << 1;
theUint = theUint | 1;

theUint = theUint >>> 1; 
theUint = theUint | mostSigBit; //Where mostSigBit = 0x80000000 DO NOT HARDCODE.
                                //Will be super slow if you do.
                                //Don't do this:
                                //theUint = theUint | 0x80000000;