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Development of energy and performance-efficient embedded software isincreasingly relying on application of complex transformations on the criticalparts of the source code. Designers applying such nontrivial source codetransformations are often faced with the problem of ensuring functionalequivalence of the original and transformed programs. Currently they have torely on incomplete and time-consuming simulation. Formal automatic verificationof the transformed program against the original is instead desirable. Thiscalls for equivalence checking tools similar to the ones available forcomparing digital circuits. We present such a tool to compare array-intensiveprograms related through a combination of important global transformations likeexpression propagations, loop and algebraic transformations. When thetransformed program fails to pass the equivalence check, the tool providesspecific feedback on the possible locations of errors.

Functional Equivalence Checking for Verification of Algebraic Transformations on Array-Intensive Source Code