We describe a compilation algorithm for efficient software pipelining of general inner loops, where the number of iterations and the time taken by each iteration may be unpredictable, due to arbitrary if-then-else statements and conditional exit statements within the loop. As our target machine, we assume a wide instruction word architecture that allows multi-way branching in the form of if-then-else trees, and that allows conditional register transfers depending on where the microinstruction branches to (a hardware implementation proposal for such a machine is briefly described in the paper). Our compilation algorithm, which we call the pipeline scheduling technique, produces a software-pipelined version of a given inner loop, which allows a new iteration of the loop to begin on every cycle whenever dependences and resources permit. The correctness and termination properties of the algorithm are studied in the paper.
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A compilation technique for software pipelining of loops with conditional jumps
Ebcioğlu, Kemal
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, Volume 19 (3)
Association for Computing Machinery – Sep 1, 1988
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