[LLVMdev] LLVM Parallel IR

[Andrey Bokhanko]

These discussions bring back memories... :-)

I suggest everyone who is looking into extending LLVM IR to express
parallel semantic to read the list archives from September and October of
2012:

http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-September/thread.html
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-October/thread.html

looking for all threads with "OpenMP" in their names.

Some things were discussed extensively back then; for example, this
proposal from Kevin:

I understand that parallelism is a very invasive concept and introducing it
> into a so far "sequential" IR will cause severe breakage and headaches.
> But I
> am afraid that if we accept parallelism as being a first class citizen,
> then I
> would prefer doing it as a core part of the IR.  One possibility to do this
> gradually might also be to have a seperate, parallel, IR, say PIR, that
> will be
> lowered to regular IR at some point (however this point is chosen).
> Existing
> optimizations can then be gradually moved from the regular IR phase to the
> PIR
> phase where appropriate and useful.  Nevertheless I do not propose to do
> such a
> thing in LLVM right now. I think this might be an option for a (bigger)
> research project at first.
>

was already refuted by Chris:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-October/054042.html

Andrey
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