From 937790195ecb644e3fcbae2d70a879748c14b4b8 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 29 Aug 2010 17:21:35 +0000
Subject: [PATCH] now that loop passes don't use DomFrontier, there is no
 reason for the unroller to pretend it supports updating it.  It still has a
 horrible hack for DomTree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112444 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopUnrollPass.cpp | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp
index 4ed2d456872..d0edfa22005 100644
--- a/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -62,13 +62,12 @@ namespace {
       AU.addPreservedID(LoopSimplifyID);
       AU.addRequiredID(LCSSAID);
       AU.addPreservedID(LCSSAID);
+      AU.addPreserved<ScalarEvolution>();
       // FIXME: Loop unroll requires LCSSA. And LCSSA requires dom info.
       // If loop unroll does not preserve dom info then LCSSA pass on next
       // loop will receive invalid dom info.
       // For now, recreate dom info, if loop is unrolled.
       AU.addPreserved<DominatorTree>();
-      AU.addPreserved<DominanceFrontier>();
-      AU.addPreserved<ScalarEvolution>();
     }
   };
 }
@@ -148,12 +147,7 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
     return false;
 
   // FIXME: Reconstruct dom info, because it is not preserved properly.
-  DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
-  if (DT) {
+  if (DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>())
     DT->runOnFunction(*F);
-    DominanceFrontier *DF = getAnalysisIfAvailable<DominanceFrontier>();
-    if (DF)
-      DF->runOnFunction(*F);
-  }
   return true;
 }