Nagaraju Pothineni Anshul Kumar Kolin Paul Exhaustive Enumeration of Legal Custom Instructions for Extensible Processors. 261-266 2008 VLSI Design http://doi.ieeecomputersociety.org/10.1109/VLSI.2008.93 conf/vlsid/2008 db/conf/vlsid/vlsid2008.html#PothineniKP08