<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 13, 2017 at 7:43 PM, Hal Finkel <span dir="ltr"><<a href="mailto:hfinkel@anl.gov" target="_blank">hfinkel@anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_-268822120178151296moz-cite-prefix">On 09/13/2017 02:16 AM, C Bergström
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<div>A completely non-technical point, but what's the
current "polly" license? Does integrating that code
conflict in any way with the work being done to
relicense llvm?<br>
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Good question. I discussed this explicitly with Tobias, and his
general feeling is that relicensing isl again would be doable if
necessary (we already did this once, to an MIT license, in order to
enable better LLVM integration).<span class=""><br>
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Does adding polly expose any additional legal risks?
Some people from Reservoir labs have explicitly stated
to me that some of their patents target polyhedral
optimizations. You should almost certainly review their
portfolio or contact them.<br>
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If at some point someone wants to add real loop
optimizations - will there be a conflict?<br>
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Can you define "real loop optimizations"?<span class=""><br></span></div></blockquote><div><br></div><div>I think most readers here will understand what I mean. I can go find specific chapters of textbooks if it's unclear. Maybe the word "real" could be replaced with traditional, well tested, industry standard or something else. (ok I'll stop being snarky)<br><br></div><div>I really do appreciate your feedback and I do think something beyond just a soft discussion is required on the IP/license vetting. The relicense process used before should be substantially similar to the process which LLVM is going to use. There's a big difference between someone randomly changing a license header and nobody complaining vs getting explicit and signed agreements from all copyright holders.<br><br></div><div>Further, my reading on some of the patents causes significant concerns. (A point everyone will want to ignore until it's too late). I'm avoiding exact references, but soon I'll start I'll start listing exact patents if nobody else cares.<br><br><br></div><div><br></div></div></div></div>