Index: lib/CodeGen/SelectionDAG/SelectionDAG.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3593,6 +3593,8 @@
         V1.fusedMultiplyAdd(V2, V3, APFloat::rmNearestTiesToEven);
       if (s != APFloat::opInvalidOp)
         return getConstantFP(V1, VT);
+      else // Bail out now to allow the target to try its own cst folding
+        return SDValue();
     }
     break;
   }