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ISVLSI
2008
IEEE

BTB Access Filtering: A Low Energy and High Performance Design

9 years 4 months ago
BTB Access Filtering: A Low Energy and High Performance Design
Powerful branch predictors along with a large branch target buffer (BTB) are employed in superscalar processors for instruction-level parallelism exploitation. However, the large BTB not only dominates the predictor energy consumption, but also becomes a major roadblock in achieving faster clock frequencies at deep sub-micron technologies. In this paper, we propose a filtering scheme to reduce the accesses to the BTB to achieve a significant dynamic energy reduction in the BTB while maintaining the performance. Our experimental evaluation using the SPEC2000 benchmark suite shows that our BTB Access Filtering (BAF) design achieves a 88.5% dynamic energy reduction over a default 2K-entry 2-way BTB at the cost of a negligible 0.1% performance loss, on the average across all benchmarks. We also studied the leakage behavior and its control in our BAF design. The results show that by applying a drowsy strategy, we can achieve a very effective leakage control in the BTB, a 83% leakage redu...
Shuai Wang, Jie Hu, Sotirios G. Ziavras
Added 31 May 2010
Updated 31 May 2010
Type Conference
Year 2008
Where ISVLSI
Authors Shuai Wang, Jie Hu, Sotirios G. Ziavras
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