diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 91491bf..344d144 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2554,7 +2554,9 @@
             VT.getVectorNumElements() ==
             Operand.getValueType().getVectorNumElements()) &&
            "Vector element count mismatch!");
-    if (OpOpcode == ISD::UNDEF)
+    if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
+      return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
+    else if (OpOpcode == ISD::UNDEF)
       // sext(undef) = 0, because the top bits will all be the same.
       return getConstant(0, VT);
     break;