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Proceedings of the 22nd International Conference on Parallel Architectures and Compilation Techniques (2005)
St. Louis, Missouri
Sept. 17, 2005 to Sept. 21, 2005
ISSN: 1089-795X
ISBN: 0-7695-2429-X
pp: 110-122
Michael F.P. O?Boyle , Member of HiPEAC, School of Informatics, University of Edinburgh
Antonio Gonzalez , Intel Labs Universitat Polit`ecnica de Catalunya
O?guz Ergin , Dept. Computer Architecture,
Jaume Abella , Intel Labs Universitat Polit`ecnica de Catalunya
Timothy M. Jones , Member of HiPEAC, School of Informatics, University of Edinburgh
ABSTRACT
<p>This paper presents a novel compiler directed technique to reduce the register pressure and power of the register file by releasing registers early. The compiler identifies registers that will only be read once and renames them to different logical registers. Upon issuing an instruction with one of these logical registers as a source, the processor knows that there will be no more uses of it and can release the register through checkpointing. This reduces the occupancy of our banked register file, allowing banks to be turned off for power savings.</p> <p>Our scheme is faster, simpler and requires less hardware than recently proposed techniques. It also maintains precise interrupts and exceptions where many other techniques do not. We reduce register occupancy by 28% in a large register file and gain in performance too; this translates into dynamic and static power saving of 18%. When compared to state-of-the-art approaches for varying register file sizes, our scheme is always faster (higher IPC) and always achieves a greater reduction in register file occupancy.</p>
INDEX TERMS
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CITATION
Michael F.P. O?Boyle, Antonio Gonzalez, O?guz Ergin, Jaume Abella, Timothy M. Jones, "Compiler Directed Early Register Release", Proceedings of the 22nd International Conference on Parallel Architectures and Compilation Techniques, vol. 00, no. , pp. 110-122, 2005, doi:10.1109/PACT.2005.14
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