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Rotation scheduling: a loop pipelining algorithm

By: LaPaugh, A.S.; Liang-Fang Chao; Sha, E.H.-M.;

1997 / IEEE


This item was taken from the IEEE Periodical ' Rotation scheduling: a loop pipelining algorithm ' We consider the resource-constrained scheduling of loops with interiteration dependencies. A loop is modeled as a data flow graph (DFG), where edges are labeled with the number of iterations between dependencies. We design a novel and flexible technique, called rotation scheduling, for scheduling cyclic DFGs using loop pipelining. The rotation technique repeatedly transforms a schedule to a more compact schedule. We provide a theoretical basis for the operations based on retiming. We propose two heuristics to perform rotation scheduling and give experimental results showing that they have very good performance.