[PATCH] D35474: SSAUpdater: Add mode when Phi creation is not allowed

[Eli Friedman via Phabricator via llvm-commits]

efriedma added inline comments.


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Comment at: include/llvm/Transforms/Utils/SSAUpdaterImpl.h:97
+    if (!FindAvailableVals(&BlockList))
+      return Traits::GetUndefVal(BB, Updater);
 
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This is bad: the caller has no way to tell what happened if you return undef (is the value actually undef at the given point, or did PHI construction fail?).


https://reviews.llvm.org/D35474