NDLI: Elastic history buffer: a low-cost method to improve branch prediction accuracy

Content Provider	IEEE Xplore Digital Library
Author	Tarlescu, M.-D. Theobald, K.B. Gao, G.R.
Copyright Year	1997
Description	Author affiliation: Sch. of Comput. Sci., McGill Univ., Montreal, Que., Canada (Tarlescu, M.-D.)
Abstract	Two-level dynamic branch predictors try to predict the outcomes of conditional branches using both a table of state counters associated with specific branch instructions and a buffer of recent branch outcomes to correlate the counters with specific branch histories. However there is always a question of how much correlation to use, and some programs benefit from higher levels of correlation than others. This paper presents the Elastic History Buffer (EHB), a low-cost yet effective scheme that can exploit the property that each branch instruction may have a different degree of correlation with other branches, while keeping the simple structure of a single global branch history. We have simulated the EHB on SPECint92 for two architectures. On average, the EHB has 25% fewer mispredictions than fixed-correlation schemes and 10% fewer than frequency-based branch classification schemes. With limited hardware (1KB), the EHB is close to the optimum measured by repeating the experiments on an "oracle" two-level predictor.
Starting Page	82
Ending Page	87
File Size	767150
Page Count	6
File Format	PDF
ISBN	081868206X
ISSN	10636404
DOI	10.1109/ICCD.1997.628853
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	History Accuracy Counting circuits Computer science Frequency Hardware Pipelines Shift registers Taxonomy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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