[llvm-commits] [llvm] r45186 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Evan Cheng]

Author: evancheng
Date: Tue Dec 18 19:34:38 2007
New Revision: 45186

URL: http://llvm.org/viewvc/llvm-project?rev=45186&view=rev
Log:
Don't leave newly created nodes around if it turns out they are not needed.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=45186&r1=45185&r2=45186&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Tue Dec 18 19:34:38 2007
@@ -1446,7 +1446,8 @@
         TLI.isOperationLegal(LoOpt.getOpcode(), LoOpt.getValueType())) {
       RetVal = true;
       DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), LoOpt);
-    }
+    } else
+      DAG.DeleteNode(Lo.Val);
   }
 
   if (HiExists) {
@@ -1457,7 +1458,8 @@
         TLI.isOperationLegal(HiOpt.getOpcode(), HiOpt.getValueType())) {
       RetVal = true;
       DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), HiOpt);
-    }
+    } else
+      DAG.DeleteNode(Hi.Val);
   }
 
   return RetVal;