[PATCH] D102834: [SLPVectorizer] WIP Implement initial memory versioning (WIP!)

[Florian Hahn via Phabricator via llvm-commits]

fhahn added a comment.

In D102834#2771053 <https://reviews.llvm.org/D102834#2771053>, @ABataev wrote:

> ...
>
> The main problem that the versioning better to perform before we try to build the tree, otherwise we may decide to gather some instructions instead of trying vectorizing them because of possible aliasing. And it may not be profitable.

This is the main challenge I think. We could split the block at the first tree that requires runtime checks, but only generate runtime checks for all trees once we processed all trees for the block. If runtime checks are not profitable over all, we can remove the cloned block and re-process the block without versioning. May be a little expensive though.


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