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It iterates over the codeblocks again to extract "implicit sets" constrained by some statically-identified invariant. This involves iterating over the dataflow & codeblocks to bitflag which values are already available, to traverse the control flow graph in free postorder to determine the place to the place to recompute the values (probably propagating them again into the codeblock’s predecessors), then iterates over the codeblocks to truly insert that recomputation.

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