NDLI: Out-of-order vector architectures

Content Provider	IEEE Xplore Digital Library
Author	Espasa, R. Valero, M. Smith, J.E.
Copyright Year	1997
Description	Author affiliation: Dept. d'Arquitectura de Computadors, Univ. Politecnica de Catalunya, Barcelona, Spain (Espasa, R.)
Abstract	Register renaming and out-of-order instruction issue are now commonly used in superscalar processors. These techniques can also be used to significant advantage in vector processors, as this paper shows. Performance is improved and available memory bandwidth is used more effectively. Using a trace driven simulation we compare a conventional vector implementation, based on the Convex C3400, with an out-of-order, register renaming, vector implementation. When the number of physical registers is above 12, out-of-order execution coupled with register renaming provides a speedup of 1.24-1.72 for realistic memory latencies. Out-of-order techniques also tolerate main memory latencies of 100 cycles with a performance degradation less than 6%. The mechanisms used for register renaming and out-of-order issue can be used to support precise interrupts-generally a difficult problem in vector machines. When precise interrupts are implemented, there is typically less than a 10% degradation in performance. A new technique based on register renaming is targeted at dynamically eliminating spill code; this technique is shown to provide an extra speedup ranging between 1.10 and 1.20 while reducing total memory traffic by an average of 15-20%.
Starting Page	160
Ending Page	170
File Size	1188027
Page Count	11
File Format	PDF
ISBN	0818679778
ISSN	10724451
DOI	10.1109/MICRO.1997.645807
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-12-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Out of order Delay Registers Vector processors Computer architecture Bandwidth Degradation Hardware Supercomputers Contracts
Content Type	Text
Resource Type	Article

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