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d8705
2020 Nov 12
0
An update on scalable vectors in LLVM
...ion Intrinsics proposed by Simon Moll (VP:
> https://reviews.llvm.org/D57504, link to the POC:
> https://repo.hca.bsc.es/gitlab/rferrer/llvm-epi). In the past Arm has
> shared an alternative implementation of 2 which predates the Vector
> Predication intrinsics (https://reviews.llvm.org/D87056).
>
I think both are equally good. The third one seems a bit too restrictive to
me (but I'm probably missing something).
I have previously recommended (1) for the sake of simplicity in
implementation (one step at a time), but I don't see anything wrong in us
trying both, even at the sa...
2020 Nov 11
3
An update on scalable vectors in LLVM
...the Vector Predication Intrinsics proposed by Simon Moll (VP: https://reviews.llvm.org/D57504, link to the POC: https://repo.hca.bsc.es/gitlab/rferrer/llvm-epi). In the past Arm has shared an alternative implementation of 2 which predates the Vector Predication intrinsics (https://reviews.llvm.org/D87056).
The three vectorization approaches are all complementary and in the end we want to support all styles. For now, these approaches have a lot in common as they all require a lot of the same ‘plumbing’ in the vectorizer to propagate ElementCount, consider a scalable VF for VPlans and need modificat...