[PATCH] D125041: [GlobalISel] Combine G_SHL, G_ASHR, G_SHL of undef shifts to undef.

[Jay Foad via Phabricator via llvm-commits]

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

LGTM. (As I understand it the rationale is that if the rhs is undef, you can assume it is a value >= the bitwidth, so the result is undef.)


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D125041/new/

https://reviews.llvm.org/D125041