Compilation of optimized OBDD-algorithms

Abstract

According to Bryant there exist basically two OBDD construction methods, namely Apply- and Compose-based approaches. In this paper we describe a compilation method that generates an optimized Apply-based OBDD-algorithm from a given combinational circuit description. The method is particularly useful in library-based synthesis- and verification environments. We also present a concise, machine independent measure for the efficiency of OBDD-construction methods. Experiments with our new method indicate a speedup of up to a factor 19 in the construction time for OBDDs while the maximum memory requirements are typically slightly smaller in comparison to conventional approaches.