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Replacing Associative Load Queues: A Timing-Centric Approach

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8 Author(s)
Castro, F. ; Dept. de Arquitectura de Comput. y Autom., Univ. Complutense de Madrid, Madrid ; Noor, R. ; Garg, A. ; Chaver, D.
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One of the main challenges of modern processor design is the implementation of a scalable and efficient mechanism to detect memory access order violations as a result of out-of-order execution. Traditional age-ordered associative load queues are complex, inefficient, and power hungry. In this paper, we introduce two new dependence checking schemes with different design tradeoffs, but both explicitly rely on timing information as a primary instrument to rule out dependence violation. Our timing-centric designs operate at a fraction of the energy cost of an associative LQ and achieve the same functionality with an insignificant performance impact on average. Studies with parallel benchmarks also show that they are equally effective and efficient in a chip-multiprocessor environment.

Published in:

Computers, IEEE Transactions on  (Volume:58 ,  Issue: 4 )

Date of Publication:

April 2009

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