[PATCH] D108826: [SLP][LTO][WIP]Allow full SLP in LTO only at link time.

Fri Aug 27 10:43:15 PDT 2021

ABataev added a comment.

In D108826#2969471 <https://reviews.llvm.org/D108826#2969471>, @lebedev.ri wrote:

> I think there is something really wrong with vectorzer passes in LTO pipelines.
> Can you say whether the problem you are observing is in ThinLTO, Full LTO, or both?

I saw it in Full LTO but suppose we have a similar problem in ThinLTO. SLP vectorizer at compile-time tries to vectorize using small vectors at it may affect other optimizations at link time (e.g. after inlining we may try to vectorize using large vector sizes etc.). This is just a preliminary attempt to see how can we fix this early optimization in SLP.

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https://reviews.llvm.org/D108826