From 1f82ecc6a0c9f88d03d6d1a6d95eeb8707bd06c1 Mon Sep 17 00:00:00 2001
From: Nicolas Geoffray <ngeoffray@google.com>
Date: Wed, 24 Jun 2015 12:20:24 +0100
Subject: Recompute dominator tree after DCE.

bug:22031382
Change-Id: Ifebe169897b76872015e3ce0ed7d0a9662f80cef
---
 compiler/optimizing/nodes.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'compiler/optimizing/nodes.h')

diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 26eee1c52e..581645f21a 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -183,6 +183,9 @@ class HGraph : public ArenaObject<kArenaAllocMisc> {
     return true;
   }
 
+  void ComputeDominanceInformation();
+  void ClearDominanceInformation();
+
   void BuildDominatorTree();
   void TransformToSsa();
   void SimplifyCFG();
@@ -590,11 +593,10 @@ class HBasicBlock : public ArenaObject<kArenaAllocMisc> {
     LOG(FATAL) << "Unreachable";
     UNREACHABLE();
   }
+  void ClearDominanceInformation();
 
   int NumberOfBackEdges() const {
-    return loop_information_ == nullptr
-        ? 0
-        : loop_information_->NumberOfBackEdges();
+    return IsLoopHeader() ? loop_information_->NumberOfBackEdges() : 0;
   }
 
   HInstruction* GetFirstInstruction() const { return instructions_.first_instruction_; }
-- 
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