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Date: Tue, 10 Dec 1996 21:29:10 GMTServer: NCSA/1.4.2Content-type: text/htmlLast-modified: Wed, 05 Apr 1995 19:29:35 GMTContent-length: 1650<html><head><title>Evaluating predicated and speculative execution on Alpha</title></head><body><h1>Evaluating predicated and speculative execution on Alpha</h1><p><dl><dt> <b> The group: </b><dd><ul><li> <!WA0><!WA0><a href="http://www.cs.washington.edu.homes/dbc1"> David Christianson </a><li> <!WA1><!WA1><a href="http://www.cs.washington.edu/homes/madani"> Omid Madani </a><li> <!WA2><!WA2><a href="http://www.cs.washington.edu/homes/kapu"> Kari Pulli </a></ul><p><dt> <b> Project idea </b><dd> Predicated execution combines the effects of performing a test andbranching based on the test. Hence a branch is avoided, whichincreases the pipeline efficiency and eases the scheduling forsuperscalar execution. Speculative execution, i.e., prediction of thebranch direction, will facilitate speculative execution since theprogram contains less branches. The exact nature of their interaction,however, is not clear at the surface. Will they have their own niches,e.g., is predicated execution mainly useful for small branches andspeculative for large branches? Will their efforts overlap so thatthe combined speedup of the parts is less than their sum, or maybethey are orthogonal (combination equals sum) or there is synergy(combination exceeds sum)?<p>Click <!WA3><!WA3><A HREF="http://www.cs.washington.edu/homes/kapu/548/proposal.txt"> here </A> for a detailed proposal.<p>In the project we ended up concentrating more on the conditionalmoves rather than speculative execution. Here's our <!WA4><!WA4><A HREF="http://www.cs.washington.edu/homes/kapu/548/report.ps">report </A>.<p>Here's the <!WA5><!WA5><A HREF="http://www.cs.washington.edu/homes/kapu/548/rawdata.ps"> data </A> we gathered.</dl><HR><address>{kapu|madani|dbc1}@cs.washington.edu</address><em> Updated 4/5/95 </em><body></html>
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