Optimization techniques not available for use in free compilers

Mike Meissner <meissner@cygnus.com>
16 Apr 1997 00:17:41 -0400

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Optimization techniques not available for use in free compilers meissner@cygnus.com (Mike Meissner) (1997-04-16)
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From: Mike Meissner <meissner@cygnus.com>
Newsgroups: comp.compilers
Date: 16 Apr 1997 00:17:41 -0400
Organization: Compilers Central
Keywords: legal, optimize, question, comment

Does somebody have a list of all of the optimization techiniques (such
as some of the register coloring algorithms patented by IBM) that for
one reason or another cannot be used in compilers whose source code is
freely available? I would prefer not to start a flamewar on the
merits pro or con of the practice, but at the same time, I don't want
to wander into known trouble areas.

Michael Meissner, Cygnus Solutions (East Coast)
4th floor, 955 Massachusetts Avenue, Cambridge, MA 02139, USA
meissner@cygnus.com, 617-354-5416 (office), 617-354-7161 (fax)
[If you visit IBM's patent web site at http://patent.womplex.ibm.com and
search for obvious words like optimize and register, you'll get a good
list to start with. A lot of the patents are junk, but a lot of them
describe useful stuff. -John]

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