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We present an approach for implementing a formally certified loop-invariantcode motion optimization by composing an unrolling pass and a formallycertified yet efficient global subexpression elimination.This approach islightweight: each pass comes with a simple and independent proof ofcorrectness.Experiments show the approach significantly narrows the performancegap between the CompCert certified compiler and state-of-the-art optimizingcompilers.Our static analysis employs an efficient yet verified hashed setstructure, resulting in fast compilation.

Simple, Light, Yet Formally Verified, Global Common Subexpression Elimination and Loop-Invariant Code Motion