[PATCH] D81212: [X86] Teach combineVectorShiftImm to constant fold undef elements to 0 not undef.

[Sanjay Patel via Phabricator via llvm-commits]

spatel accepted this revision.
spatel added a comment.
This revision is now accepted and ready to land.

LGTM - I double-checked that generic constant folding in IR and SDAG gets this right:

  // shift undef, Y --> 0 (can always assume that the undef value is 0)


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D81212