From 81a129c0fb6cc3022bb0b5e48ab06d8ab7dc03d5 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Mon, 30 Jul 2007 20:23:45 +0000
Subject: [PATCH] LCSSA preserves dom info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40604 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/LCSSA.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp
index 3f4bad5c513..466136dea7d 100644
--- a/lib/Transforms/Utils/LCSSA.cpp
+++ b/lib/Transforms/Utils/LCSSA.cpp
@@ -73,6 +73,14 @@ namespace {
       AU.addPreserved<LoopInfo>();
       AU.addRequired<DominatorTree>();
       AU.addPreserved<ScalarEvolution>();
+      AU.addPreserved<DominatorTree>();
+
+      // Request DominanceFrontier now, even though LCSSA does
+      // not use it. This allows Pass Manager to schedule Dominance
+      // Frontier early enough such that one LPPassManager can handle
+      // multiple loop transformation passes.
+      AU.addRequired<DominanceFrontier>(); 
+      AU.addPreserved<DominanceFrontier>();
     }
   private:
     void getLoopValuesUsedOutsideLoop(Loop *L,
-- 
2.34.1