[PATCH] D57468: Strengthen handling of GEPs and generic calls for all undef lanes

[Sanjay Patel via Phabricator via llvm-commits]

spatel added inline comments.


================
Comment at: lib/Transforms/InstCombine/InstCombineCalls.cpp:1884
+
+    if (UndefElts.isAllOnesValue())
+      return replaceInstUsesWith(*II, UndefValue::get(II->getType()));
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I'm not sure how to expose this in a regression test, but would it make sense to add this check to the bottom of SimplifyDemandedVectorElts() itself, so callers don't have to deal with this possibility themselves?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57468/new/

https://reviews.llvm.org/D57468