[PATCH] D91711: SCEV add function to see if SCEVUnknown is null
Max Kazantsev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 25 23:39:38 PST 2020
mkazantsev added a comment.
My understanding of this situation is that, whenever we delete an instruction that may be referenced by SCEV, we should call `forgetValue` for it. SCEV that contains references on deleted instructions is invalid. Faling to forget deleted values is a bug. I don't understand why `llvm.dbg.value` is somehow special about it.
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