Re: elimination methods...

Michael Wolfe <>
Fri, 23 Jun 1995 04:02:16 GMT

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Newsgroups: comp.compilers
From: Michael Wolfe <>
Keywords: optimize, courses
Organization: Oregon Graduate Institute - Computer Science & Engineering
References: 95-05-138
Date: Fri, 23 Jun 1995 04:02:16 GMT
Status: RO

I have taught compiler optimization courses as short courses several times;
the audience is almost entirely commercial compiler vendors, often for
processors that we don't usually consider (signal processing, etc.). I always
ask questions like what data flow analysis methods are used. The sampling is
not scientific, but there are always quite a few who use elimination methods
(interval analysis) and even some who use syntax-based methods, in addition
to those who use iterative methods. I ask the interval or syntax-based group
what they do in case of irreducible graphs, and the answers are either fall
back to iterative methods, or use node splitting, or give up.

no science here.
- Michael Wolfe

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