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Speculative Tag Access for Reduced Energy Dissipation in Set-Associative L1 Data Caches

Alen Bardizbanyan (Institutionen för data- och informationsteknik, Datorteknik (Chalmers)) ; Magnus Själander (Institutionen för data- och informationsteknik, Datorteknik (Chalmers)) ; David Whalley ; Per Larsson-Edefors (Institutionen för data- och informationsteknik, Datorteknik (Chalmers))
Proceedings of IEEE International Conference on Computer Design (ICCD), Asheville, NC, USA, October 6-9 2013 p. 302-308. (2013)
[Konferensbidrag, refereegranskat]

Due to performance reasons, all ways in set-associative level-one (L1) data caches are accessed in parallel for load operations even though the requested data can only reside in one of the ways. Thus, a significant amount of energy is wasted when loads are performed. We propose a speculation technique that performs the tag comparison in parallel with the address calculation, leading to the access of only one way during the following cycle on successful speculations. The technique incurs no execution time penalty, has an insignificant area overhead, and does not require any customized SRAM implementation. Assuming a 16kB 4-way set-associative L1 data cache implemented in a 65-nm process technology, our evaluation based on 20 different MiBench benchmarks shows that the proposed technique on average leads to a 24% data cache energy reduction.



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Denna post skapades 2013-09-05. Senast ändrad 2016-09-14.
CPL Pubid: 182838

 

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