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Proceedings of 2010 Cross-Strait Conference on Information Science and Technology (CSCIST 2010 E-BOOK)

Qinhuangdao,China,7.9-7.13，2010

ISBN: 978-1-935068-15-0 Scientific Research Publishing, USA

E-Book 840pp Pub. Date: July 2010

Category: Computer Science & Communications

Price: $120

Title: Improving Power Saving for Filter-Based Branch Target Buffer
Source: Proceedings of 2010 Cross-Strait Conference on Information Science and Technology (CSCIST 2010 E-BOOK) (pp 511-515)
Author(s): Yeong-Chang Maa, Department of Computer Science and Engineering, Taiwan Ocean University Keelung, 202
Mao-Hsu Yen, Department of Computer Science and Engineering, Taiwan Ocean University Keelung, 202
Chun-Hung Wang, Department of Computer Science and Engineering, Taiwan Ocean University Keelung, 202
Guan-Luen Lee, Department of Computer Science and Engineering, Taiwan Ocean University Keelung, 202
Xumin Guo, Department of Computer Science and Engineering, Taiwan Ocean University Keelung, 202
Abstract: In this paper we propose an improved sentry-table (S-Table) filter based low power branch target buffer (BTB) of branch predictor in modern processors. The S-Table scheme filters unnecessary accesses of BTB to reduce dynamic power dissipation, but previously the power saving was found bound by the decoder power. The proposed hierarchical decoder (H-DEC) can significantly offset such effect. CACTI, SimpleScalar, Wattch tools and SPEC2000 benchmarks were used to conduct the investigation. From our empirical studies, power savings for BTB can be further improved from 19~38% to 68~91%; and those for branch predictor from 17~21% to 37~81%.
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