Index: lib/Target/X86/X86ISelDAGToDAG.cpp
===================================================================
--- lib/Target/X86/X86ISelDAGToDAG.cpp
+++ lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2455,6 +2455,7 @@
       DEBUG(dbgs() << "=> "; ResHi.getNode()->dump(CurDAG); dbgs() << '\n');
     }
 
+    CurDAG->RemoveDeadNode(Node);
     return;
   }
 
@@ -2639,6 +2640,7 @@
       ReplaceUses(SDValue(Node, 1), Result);
       DEBUG(dbgs() << "=> "; Result.getNode()->dump(CurDAG); dbgs() << '\n');
     }
+    CurDAG->RemoveDeadNode(Node);
     return;
   }
 
@@ -2697,6 +2699,7 @@
         // one, do not call ReplaceAllUsesWith.
         ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
                     SDValue(NewNode, 0));
+        CurDAG->RemoveDeadNode(Node);
         return;
       }
 
@@ -2732,6 +2735,7 @@
         // one, do not call ReplaceAllUsesWith.
         ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
                     SDValue(NewNode, 0));
+        CurDAG->RemoveDeadNode(Node);
         return;
       }
 
@@ -2752,6 +2756,7 @@
         // one, do not call ReplaceAllUsesWith.
         ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
                     SDValue(NewNode, 0));
+        CurDAG->RemoveDeadNode(Node);
         return;
       }
 
@@ -2772,6 +2777,7 @@
         // one, do not call ReplaceAllUsesWith.
         ReplaceUses(SDValue(Node, (Opcode == X86ISD::SUB ? 1 : 0)),
                     SDValue(NewNode, 0));
+        CurDAG->RemoveDeadNode(Node);
         return;
       }
     }