diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index fd2ad5c..da0f8cf 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -449,7 +449,7 @@
   case ISD::FP_ROUND:
   case ISD::FSIN:
     return DAG.getNode(Op.getOpcode(), Op.getValueType(),
-                       GetNegatedExpression(Op, DAG));
+                       GetNegatedExpression(Op.getOperand(0), DAG));
   }
 }