1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 89f139765b0..ddc95dce734 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -9004,8 +9004,11 @@ static SDValue lowerV2F64VectorShuffle(const SDLoc &DL, ArrayRef<int> Mask,
                          DAG.getConstant(SHUFPDMask, DL, MVT::i8));
     }
 
-    return DAG.getNode(X86ISD::SHUFP, DL, MVT::v2f64, V1, V1,
-                       DAG.getConstant(SHUFPDMask, DL, MVT::i8));
+    return DAG.getNode(
+        X86ISD::SHUFP, DL, MVT::v2f64,
+        Mask[0] == SM_SentinelUndef ? DAG.getUNDEF(MVT::v2f64) : V1,
+        Mask[1] == SM_SentinelUndef ? DAG.getUNDEF(MVT::v2f64) : V1,
+        DAG.getConstant(SHUFPDMask, DL, MVT::i8));
   }
   assert(Mask[0] >= 0 && Mask[0] < 2 && "Non-canonicalized blend!");
   assert(Mask[1] >= 2 && "Non-canonicalized blend!");