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Algorithms and Architecture Support for Pipelining and Scheduling Nested Loops with Conditions (1997)
BibTeX
@MISC{Yu97algorithmsand,
author = {Ted Zhihong Yu and Edwin H.-M. Sha and Nelson Passos and Roy Dz-ching Ju},
title = {Algorithms and Architecture Support for Pipelining and Scheduling Nested Loops with Conditions},
year = {1997}
}
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Abstract
Nested loops are widely used in scientific applications such as image processing, geophysical signal processing and fluid dynamics. However, branches within these loops may degrade the performance on the underlying pipelined architecture. This paper presents the theory, supporting hardware and experiments of a novel technique, based on multi-dimensional retiming, for reducing pipeline hazards caused by branches within nested loops. This technique, called Multi-Dimensional Branch Anticipation Scheduling, is able to achieve optimal or near-optimal schedule length for nested loops containing branch instructions in polynomial time. It transforms a multi-dimensional conditional data flow graph representing the nested loop, carries out conditional resource sharing, breaks sharing-prevention cycles and minimizes additional hardware requirements incurred by propagation of branch control signals along the schedule. Such propagation is accomplished by Branch Anticipation Bits (babits). We furth...
Keyphrases
nested loop architecture support scheduling nested loop geophysical signal processing pipelined architecture branch instruction multi-dimensional branch anticipation scheduling multi-dimensional conditional data flow graph additional hardware requirement branch control signal sharing-prevention cycle conditional resource sharing polynomial time novel technique scientific application multi-dimensional retiming pipeline hazard near-optimal schedule length image processing branch anticipation bit fluid dynamic
