[PATCH] D79452: [VectorCombine] scalarize binop of inserted elements into undef

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In D79452#2022567 <https://reviews.llvm.org/D79452#2022567>, @spatel wrote:

> undef ^ undef is actually undef:
>  http://volta.cs.utah.edu:8080/z/GAs5QJ
>
> But I think we choose to fold to "0" on that to avoid breaking too much existing source code and/or expose possible semantic incompatibility with source code?


https://groups.google.com/forum/#!topic/llvm-dev/C5ydxnn-r0o


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