From 71d5a2540a98c81f5bcaeb48805e0e2881f530ef Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 16 Apr 2017 16:01:22 +0000
Subject: Vendor import of llvm trunk r300422:
 https://llvm.org/svn/llvm-project/llvm/trunk@300422

---
 include/llvm/CodeGen/MachineDominators.h | 22 ++++------------------
 1 file changed, 4 insertions(+), 18 deletions(-)

(limited to 'include/llvm/CodeGen/MachineDominators.h')

diff --git a/include/llvm/CodeGen/MachineDominators.h b/include/llvm/CodeGen/MachineDominators.h
index 21ecef587aa5..30b6cfdd1c36 100644
--- a/include/llvm/CodeGen/MachineDominators.h
+++ b/include/llvm/CodeGen/MachineDominators.h
@@ -21,6 +21,7 @@
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/Support/GenericDomTree.h"
 #include "llvm/Support/GenericDomTreeConstruction.h"
+#include <memory>
 
 namespace llvm {
 
@@ -60,7 +61,7 @@ class MachineDominatorTree : public MachineFunctionPass {
   mutable SmallSet<MachineBasicBlock *, 32> NewBBs;
 
   /// The DominatorTreeBase that is used to compute a normal dominator tree
-  DominatorTreeBase<MachineBasicBlock>* DT;
+  std::unique_ptr<DominatorTreeBase<MachineBasicBlock>> DT;
 
   /// \brief Apply all the recorded critical edges to the DT.
   /// This updates the underlying DT information in a way that uses
@@ -74,9 +75,9 @@ public:
 
   MachineDominatorTree();
 
-  ~MachineDominatorTree() override;
-
   DominatorTreeBase<MachineBasicBlock> &getBase() {
+    if (!DT)
+      DT.reset(new DominatorTreeBase<MachineBasicBlock>(false));
     applySplitCriticalEdges();
     return *DT;
   }
@@ -244,21 +245,6 @@ public:
     CriticalEdgesToSplit.push_back({FromBB, ToBB, NewBB});
   }
 
-  /// \brief Returns *false* if the other dominator tree matches this dominator
-  /// tree.
-  inline bool compare(const MachineDominatorTree &Other) const {
-    const MachineDomTreeNode *R = getRootNode();
-    const MachineDomTreeNode *OtherR = Other.getRootNode();
-
-    if (!R || !OtherR || R->getBlock() != OtherR->getBlock())
-      return true;
-
-    if (DT->compare(*Other.DT))
-      return true;
-
-    return false;
-  }
-
   /// \brief Verify the correctness of the domtree by re-computing it.
   ///
   /// This should only be used for debugging as it aborts the program if the
-- 
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