Hardware pipelining of repetitive patterns in processor instruction traces

• Autor(a) principal: João Bispo
• Data de Publicação: 2013
• Outros Autores: João Paiva Cardoso, Monteiro,J
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://repositorio.inesctec.pt/handle/123456789/6393

Dynamic partitioning is a promising technique where computations are transparently moved from a General Purpose Processor (GPP) to a coprocessor during application execution. To be effective, the mapping of computations to the coprocessor needs to consider aggressive optimizations. One of the mapping optimizations is loop pipelining, a technique extensively studied and known to allow substantial performance improvements. This paper describes a technique for pipelining Megablocks, a type of runtime loop developed for dynamic partitioning. The technique transforms the body of Mega-blocks into an acyclic dataflow graph which can be fully pipe-lined and is based on the atomic execution of loop iterations. For a set of 9 benchmarks without memory operations, we generated pipelined hardware versions of the loops and esti-mate that the presented loop pipelining technique increases the average speedup of non-pipelined coprocessor accelerated designs from 1.6× to 2.2×. For a larger set of 61 benchmarks which include memory operations, we estimate through simulation a speedup increase from 2.5× to 5.6× with this technique.