[PATCH] D124988: [DAGCombiner] Fold (sext/zext undef) -> 0 and aext(undef) -> undef.

Jessica Clarke via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Thu May 5 10:49:10 PDT 2022

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jrtc27 added a comment.

What's the justification for 0 rather than undef? That the high bits need to be guaranteed equal even for undef input?


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