[PATCH] D133473: [WebAssembly] Improve codegen for shuffles with undefined lane indices

[Petr Penzin via Phabricator via llvm-commits]

penzn accepted this revision.
penzn added a comment.

A stray thought: we have disabled combining shuffles because it was producing precisely the masks this change seeks to eliminate, I am wondering if we can reenable some of those optimization based on this.

Background:

https://github.com/emscripten-core/emscripten/issues/9340
https://github.com/WebAssembly/simd/issues/196


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D133473