[PATCH] D150707: [DebugInfo] Handle undefined values for DBG_PHIs in InstrRef-LiveDebugValues

[Stephen Tozer via Phabricator via llvm-commits]

StephenTozer added a comment.

In D150707#4352523 <https://reviews.llvm.org/D150707#4352523>, @jmorse wrote:

> LGTM. Interesting that we get a DBG_PHI dominated by another same-numbered DBG_PHI here, I don't think that's a problem for any code we have but a curiosity to be aware of.

That example is entirely artificial, it just exists in the test to provide an example where one DBG_PHI being unreachable doesn't automatically undef the user. I would have thought it possible that some combination of legal CFG transformations could cause one DBG_PHI to become dominated by another, but if you think it's infeasible and undesirable to include then I can remove that part from the test.


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