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+First of all, most of the compiler passes in \compcert{} have been proven correct, meaning that once the compiler is built, the proofs can be erased as the algorithm has been shown to be correct independent of the input.  However, some optimisation passes such as software pipelining require translation validation~\cite{tristan08_formal_verif_trans_valid}, in which case the correctness of the compiler pass needs to be checked at runtime.  However, even in this case the verifier itself is proven to only verify code correct that does indeed behave in the same way.