[llvm-dev] [RFC] Heterogeneous LLVM-IR Modules (original) (raw)

Renato Golin via llvm-dev llvm-dev at lists.llvm.org
Thu Jul 30 10:41:08 PDT 2020

On Thu, 30 Jul 2020 at 17:46, Johannes Doerfert <johannesdoerfert at gmail.com> wrote:

So we don't rewrite everything but instead "just" need to duplicate all the information in the IR such that each opt invocation can extract it's respective set of values and run on the respective set of global symbols. This would reduce the new stuff to more or less what we started with: device triple & DL, and a way to link global symbol to a device triple & DL. It is the two module approach but with "co-located" modules ;)

I think you're being overly optimistic in hoping the "triple+DL" representation will be enough to emulate multi-target.

It may work for the cases you care about but it will create a host of corner cases that the community will have to maintain with no tangible additional benefit to a large portion of it.

But I'd like to heat the opinion of others on the subject before making up my own mind...

--renato

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