diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
@@ -5945,7 +5945,7 @@
     Mask = GetWidenedMask(Mask, WideEC);
     WideMemVT = EVT::getVectorVT(*DAG.getContext(),
                                  VPSC->getMemoryVT().getScalarType(), WideEC);
-  } else if (OpNo == 4) {
+  } else if (OpNo == 3) {
     // Just widen the index. It's allowed to have extra elements.
     Index = GetWidenedVector(Index);
   } else