Re: rearranging code invalidates liveness info

newburn@aslan.ece.cmu.edu (Chris Newburn)
Mon, 13 Jun 1994 22:35:28 GMT

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Newsgroups: comp.compilers
From: newburn@aslan.ece.cmu.edu (Chris Newburn)
Keywords: optimize
Organization: Electrical and Computer Engineering, Carnegie Mellon.
References: 94-06-070
Date: Mon, 13 Jun 1994 22:35:28 GMT

Fergus Henderson <fjh@munta.cs.mu.OZ.AU> wrote:
>[Code reorganization breaks analysis data. What to do?]


I incrementally maintain data flow info such as liveness hierarchically in
an ordered program dependence graph. As code is moved within the program,
i.e., into, out of, or past a region, data flow info can be maintained
incrementally. This incremental approach is helpful when liveness info is
required to do code motion, but the code motion affects that liveness info.


I haven't yet written this up anywhere, so I'm afraid I can't provide all
of the details.


-Chris
--
Chris J. Newburn newburn@ece.cmu.edu
Department of Electrical and Computer Engineering, Carnegie Mellon University
--

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