All example of using pseudofields to eliminate version shuffling in horizontal code compaction

Abstract

This paper first reviews the version shuffling problem for microcode compaction. Next, a somewhat representative compaction problem involving asymmetric ALUs and a port-limited register file is presented. Finally, the paper shows how to model the architecture in a microcode compiler using the concept of pseudofields. While the modeling process is nontrivial, it is seen that this approach solves the version shuffling problem without introducing early-binding inefficiencies in the compiled code.