Rajaraman Ramanarayanan Sanu Mathew Vasantha Erraguntla Ram Krishnamurthy Shay Gueron A 2.1GHz 6.5mW 64-bit Unified PopCount/BitScan Datapath Unit for 65nm High-Performance Microprocessor Execution Cores. 273-278 2008 VLSI Design http://doi.ieeecomputersociety.org/10.1109/VLSI.2008.75 conf/vlsid/2008 db/conf/vlsid/vlsid2008.html#RamanarayananMEKG08