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2003
ACM

Discovering affine equalities using random interpretation

12 years 6 months ago
Discovering affine equalities using random interpretation
We present a new polynomial-time randomized algorithm for discovering affine equalities involving variables in a program. The key idea of the algorithm is to execute a code fragment on a few random inputs, but in such a way that all paths are covered on each run. This makes it possible to rule out invalid relationships even with very few runs. The algorithm is based on two main techniques. First, both branches of a conditional are executed on each run and at joint points we perform an affine combination of the joining states. Secondly, in the branches of an equality conditional we adjust the data values on the fly to reflect the truth value of the guarding boolean expression. This increases the number of affine equalities that the analysis discovers. The algorithm is simpler to implement than alternative deterministic versions, has better computational complexity, and has an extremely small probability of error for even a small number of runs. This algorithm is an example of how rando...
Sumit Gulwani, George C. Necula
Added 03 Dec 2009
Updated 03 Dec 2009
Type Conference
Year 2003
Where POPL
Authors Sumit Gulwani, George C. Necula
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