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Fast Computation of Strong Control Dependencies

Marek Chalupa; David Klaška; Jan Strejček; Lukáš Tomovič

We introduce new algorithms for computing non-termination sensitive control dependence (NTSCD) and decisive order dependence (DOD). These relations on vertices of a control flow graph have many applications including program slicing and compiler optimizations. Our algorithms are asymptotically faster than the current algorithms. We also show that the original algorithms for computing NTSCD and DOD may produce incorrect results. We implemented the new as well as fixed versions of the original algorithms for the computation of NTSCD and DOD.  Experimental evaluation shows that our algorithms dramatically outperform the original ones.

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