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Journals ACM SIGARCH Computer Architecture News Volume 33 Issue 2

New processors, both embedded and general purpose, often have conflicting design requirements involving space, power, and performance. Architectural features and compiler optimizations often target one or more design goals at the expense of the others. This paper presents a novel architectural and compiler approach to simultaneously reduce power requirements, decrease code size, and improve performance by integrating an instruction register file (IRF) into the architecture. Frequently occurring instructions are placed in the IRF. Multiple entries in the IRF can be referenced by a single packed instruction in ROM or L1 instruction cache. Unlike conventional code compression, our approach allows the frequent instructions to be referenced in arbitrary combinations. The experimental results show significant improvements in space and power, as well as some improvement in execution time when using only 32 entries. These advantages make packing instructions into registers an effective approach for improving overall efficiency.

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Improving Program Efficiency by Packing Instructions into Registers

Hines, Stephen; Green, Joshua; Tyson, Gary; Whalley, David
ACM SIGARCH Computer Architecture News , Volume 33 (2)
Association for Computing Machinery – May 1, 2005

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