[PATCH] D121869: [WebAssembly] Disable SimplifyDemandedVectorElts after legalization

[Heejin Ahn via Phabricator via llvm-commits]

aheejin added a comment.

I wasn't able to check performances for real-world programs myself, but there's no changes in our existing tests. I don't think it will have a huge impact because I made the condition fairly specific: we bail out only when it is a `build_vector` and the DAG is already type-legalized and legalized, meaning it does so only in the very last stage before instruction selection. Also I'm not sure if there's any other way around this at this point.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D121869