[PATCH] D87149: [InstCombine] erase instructions leading up to unreachable

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

> Actually, that would be out-of-bounds for instcombine. Removing a phi operand would mean removing the incoming block too, and we don't do that in instcombine. So I think we just bail out if a value still has uses. SimplifyCFG will eventually get it.

Replacing with undef before erasing would do as well.


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https://reviews.llvm.org/D87149