After legalizing a DAG, delete dead nodes to save space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19346 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index c8369aa1c61e9037ace4db1a5248dd15bae8330c..a3a758f0aad12fcf0220af0de7a64061bb3577b0 100644 (file)
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -167,7 +167,6 @@ SelectionDAGLegalize::SelectionDAGLegalize(TargetLowering &tli,
     setValueTypeAction(MVT::f32, Promote);
 }
 
-
 void SelectionDAGLegalize::LegalizeDAG() {
   SDOperand OldRoot = DAG.getRoot();
   SDOperand NewRoot = LegalizeOp(OldRoot);
@@ -177,11 +176,7 @@ void SelectionDAGLegalize::LegalizeDAG() {
   LegalizedNodes.clear();
 
   // Remove dead nodes now.
-  if (OldRoot != NewRoot)
-    // Delete all of these efficiently first.
-    ;
-  
-  // Then scan AllNodes.
+  DAG.RemoveDeadNodes(OldRoot.Val);
 }
 
 SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {