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Title: Studying new ways for improving adaptive history length branch predictors
Authors: Falcón, Ayose
Santana Jaria, Oliverio Jesús 
Medina Rodríguez, Pedro 
Fernández García, Enrique 
Ramírez, Alex
Valero, Mateo
UNESCO Clasification: 330406 Arquitectura de ordenadores
Keywords: Branch prediction
Dynamic history length
Opportunity cost
Issue Date: 2002
Publisher: Springer 
Journal: Lecture Notes in Computer Science 
Conference: 4th International Symposium on High Performance Computing, ISHPC 2002 
Abstract: Pipeline stalls due to branches limit processor performance significantly. This paper provides an in depth evaluation of Dynamic History Length Fitting, a technique that changes the history length of a two-level branch predictor during the execution, trying to adapt to its different phases. We analyse the behaviour of DHLF compared with fixed history length gshare predictors, and contribute showing two factors that explain DHLF behaviour: Opportunity Cost and Warm-up Cost. Additionally, we evaluate the use of profiling for detecting future improvements. Using this information, we show that new heuristics that minimise both opportunity cost and warm-up cost could outperform significantly current variable history length techniques. Especially at program start-up, where the algorithm tries to learn the behaviour of the program to better predict future branches, the use of profiling reduces considerably the cost produced by continuous history length changes.
ISBN: 978-3-540-43674-4
ISSN: 0302-9743
DOI: 10.1007/3-540-47847-7_23
Source: Zima H.P., Joe K., Sato M., Seo Y., Shimasaki M. (eds) High Performance Computing. ISHPC 2002. Lecture Notes in Computer Science, vol 2327. Springer, Berlin, Heidelberg
Appears in Collections:Actas de congresos
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