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

Provided by: Institute of Electrical & Electronic Engineers
Topic: Big Data
Format: PDF
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. The authors 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.

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