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Compiler implementation of the D programming language.
||Initialize block information.|
||Compute dominators (Bdom) for each block. See Aho & Ullman Fig. 13.5. Note that flow graph is reducible if there is only one pass through the loop.|
||Return !=0 if block A dominates block B.|
||Loop invariant and induction variable elimination.|
||Unroll loop if possible.|
||Update rd vector.|
||Loop data structure.|