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Convex invariant refinement by control node splitting: a heuristic approach

Abstract : To improve the accuracy of invariants found when analyzing a transition system, we introduce an original rewriting heuristic of control flow graphs, based on a control node splitting algorithm. The transformation preserves the program behaviors, whilst allowing a finer analysis. We have carried out experiments with PIPS, a source-to-source compiler, and Aspic, an abstract interpretation tool, using 71 test cases published by Gonnord, Gulwani, Halbwachs, Jeannet & al. The number of invariants found by these tools goes up from 28 to 69 for PIPS and from 44 to 62 for Aspic when our heuristics is used as a preprocessing step. The total execution time of PIPS is only marginally increased, going up from 76 to 103s, thus showing the practical interest of our optimization technique.
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Vivien Maisonneuve. Convex invariant refinement by control node splitting: a heuristic approach. Third International Workshop on Numerical and Symbolic Abstract Domains, NSAD 2011, Sep 2011, Venise, Italy. pp.49-59, ⟨10.1016/j.entcs.2012.10.007⟩. ⟨hal-00833344⟩



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