Title: Filtering of unnecessary branch predictor lookups for low-power processor architecture
Authors: Chiao, Wei-Hau
Chung, Chung-Ping
Department of Computer Science
Keywords: branch prediction;BTB;lookup filtering;low power;pipelined processor
Issue Date: 1-Jul-2008
Abstract: Efforts to reduce power consumption of processors have gained much attention recently. Dynamic branch predictor, including BTB, is exercised in every instruction cycle, yet branch instructions only constitute a small percentage of instructions during program execution. This study proposes a novel method to collect the next branch distances of the recent branch instructions at runtime, in order to eliminate unnecessary branch predictor lookups. Simulation results show that the proposed design reduces the energy consumption in the dynamic branch predictor by an average of 56.95% without performance degradation. The proposed method is fully compatible with BPP and SEPAS, and saves more energy than PPD, Lazy BTB, and EIB does.
URI: http://hdl.handle.net/11536/8687
ISSN: 1016-2364
Volume: 24
Issue: 4
Begin Page: 1127
End Page: 1142
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