Modulo Scheduling for Control-Intensive General-Purpose Programs

115 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.This dissertation also demonstrates that unrolling-based optimization prior to scheduling improves the performance of modulo scheduled loops and is, in fact, necessary to allow modulo scheduling to surpass the performance of acyclic scheduling for control-intensive general-purpose programs. Modulo scheduling has the following advantages over the acyclic scheduling approach for control-intensive general-purpose programs. First, modulo scheduling increases performance by maintaining the overlap of loop iterations throughout the execution of the loop. Second, modulo scheduling reduces register pressure by initiating iterations at a consistent rate that is sustainable for the given resources and dependence structure. Third, with the appropriate architectural support, modulo scheduling results in less code expansion because unrolling is required only for optimization, but not to amortize the loss of overlap across the back edge.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD