From c2b768f09e108b71348af58f3ab31d0fc6d15dd6 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 17 Sep 2010 21:59:42 +0000
Subject: [PATCH] Machine CSE was forgetting to clear some data structures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114222 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineCSE.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index 39a50d2078f..272b54dea1f 100644
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/lib/CodeGen/MachineCSE.cpp
@@ -54,6 +54,11 @@ namespace {
       AU.addPreserved<MachineDominatorTree>();
     }
 
+    virtual void releaseMemory() {
+      ScopeMap.clear();
+      Exps.clear();
+    }
+
   private:
     const unsigned LookAheadLimit;
     typedef ScopedHashTableScope<MachineInstr*, unsigned,
@@ -469,6 +474,8 @@ bool MachineCSE::PerformCSE(MachineDomTreeNode *Node) {
   DenseMap<MachineDomTreeNode*, MachineDomTreeNode*> ParentMap;
   DenseMap<MachineDomTreeNode*, unsigned> OpenChildren;
 
+  CurrVN = 0;
+
   // Perform a DFS walk to determine the order of visit.
   WorkList.push_back(Node);
   do {