Subcubic algorithms for recursive state machines

  • Authors:
  • Swarat Chaudhuri

  • Affiliations:
  • Pennsylvania State University, University Park, PA

  • Venue:
  • Proceedings of the 35th annual ACM SIGPLAN-SIGACT symposium on Principles of programming languages
  • Year:
  • 2008

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Abstract

We show that the reachability problem for recursive state machines (or equivalently, pushdown systems), believed for long to have cubic worst-case complexity, can be solved in slightly subcubic time. All that is necessary for the new bound is a simple adaptation of a known technique. We also show that a better algorithm exists if the input machine does not have infinite recursive loops.