From 02132d62c1ed55fc0d5e03413c314fffc59489f0 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 19 Dec 2007 01:34:38 +0000
Subject: [PATCH] Don't leave newly created nodes around if it turns out they
 are not needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45186 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 1400c3ee4f9..a1d8ad95de5 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1446,7 +1446,8 @@ bool DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N,
         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 @@ bool DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N,
         TLI.isOperationLegal(HiOpt.getOpcode(), HiOpt.getValueType())) {
       RetVal = true;
       DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), HiOpt);
-    }
+    } else
+      DAG.DeleteNode(Hi.Val);
   }
 
   return RetVal;