Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -34179,7 +34179,9 @@
   } else {
     assert((N->getOpcode() == X86ISD::FMADD || N->getOpcode() == ISD::FMA) &&
            "Unexpected opcode!");
-    return DAG.getNode(NewOpcode, dl, VT, A, B, C);
+    if (NewOpcode != N->getOpcode())
+      return DAG.getNode(NewOpcode, dl, VT, A, B, C);
+    return SDValue();
   }
 
   return DAG.getNode(NewOpcode, dl, VT, A, B, C, N->getOperand(3));