diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4022,10 +4022,7 @@
 
   // More could be done here, though the above checks are enough
   // to handle some common cases.
-
-  // Fall back to computeKnownBits to catch other known cases.
-  KnownBits Known = computeKnownBits(Val);
-  return (Known.countMaxPopulation() == 1) && (Known.countMinPopulation() == 1);
+  return false;
 }
 
 unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const {