Register allocation patent

stevec@pact.srf.ac.uk (Stephen Clarke)
Mon, 27 Nov 1995 17:26:17 GMT

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Register allocation patent stevec@pact.srf.ac.uk (1995-11-27)
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Newsgroups: comp.compilers
From: stevec@pact.srf.ac.uk (Stephen Clarke)
Keywords: registers, optimize, question, legal
Organization: University of Bristol, England
Date: Mon, 27 Nov 1995 17:26:17 GMT

What is the status of IBM's patent on register allocation and spilling
via graph coloring? Most people seem to reference Chaitin's work when
describing their register allocators, including numerous commercial
companies; is the patent unenforceable?


Stephen Clarke
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PACT (Partnership in Advanced Computer Technoligies)
Email: stevec@pact.srf.ac.uk
Mail : 10 Priory Road, Clifton, Bristol, BS8 1TU. UK.
Phone: +44 117 970 7188, Fax +44 272 707 171.
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