PARE: A Power-Aware Data Prefetching Engine

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International Symposium on Low Power Electronics and Design


pp. 339 - 344

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Aggressive hardware prefetching often significantly increases energy consumption in the memory system. Experiments show that a major fraction of prefetching related energy degradation is due to the hardware history table related energy costs. In this paper, we present PARE, a PowerAware pRefetching Engine that uses a newly designed indexed hardware history table. Compared to the conventional single table design, the new prefetching table consumes 7-11X less power per access. With the help of compilerbased location-set analysis, we show that the proposed PARE design improves energy consumption by as much as 40% in the data memory systems in 70-nm BTPM processor designs.

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