Operation Latencies

kernel_learner@yahoo.com (Learner)
8 Feb 2004 22:07:39 -0500

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From: kernel_learner@yahoo.com (Learner)
Newsgroups: comp.compilers
Date: 8 Feb 2004 22:07:39 -0500
Organization: http://groups.google.com
Keywords: optimize, architecture, question
Posted-Date: 08 Feb 2004 22:07:39 EST

Dear All,


A question:


Many operations have variable latencies...so I was wondering how
compilers do scheduling for VLIW and how they calculate the critical
path of a data dependence graph when the latencies of operations are
not known at compile time.. Some scheduling like s/w pipelining
requires calculation of RecMII which needs to know the critical path
in the ddg... How can you be sure you have the critical path when the
latencies can vary?


What are the usual approaches ?


Thanks!
LEarner

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