From ea1092374cdeea2a4ba66bfdc33e40c0fee9ebe2 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 29 Aug 2010 17:23:19 +0000
Subject: [PATCH] apparently unswitch had the same "Feature".  Stop its claims
 that it preserves domfrontier if it doesn't really.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112445 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/LoopUnswitch.cpp | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp
index 717917e2cea..5465921cb6e 100644
--- a/lib/Transforms/Scalar/LoopUnswitch.cpp
+++ b/lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -77,7 +77,6 @@ namespace {
     bool redoLoop;
 
     Loop *currentLoop;
-    DominanceFrontier *DF;
     DominatorTree *DT;
     BasicBlock *loopHeader;
     BasicBlock *loopPreheader;
@@ -93,14 +92,14 @@ namespace {
     static char ID; // Pass ID, replacement for typeid
     explicit LoopUnswitch(bool Os = false) : 
       LoopPass(ID), OptimizeForSize(Os), redoLoop(false), 
-      currentLoop(NULL), DF(NULL), DT(NULL), loopHeader(NULL),
+      currentLoop(NULL), DT(NULL), loopHeader(NULL),
       loopPreheader(NULL) {}
 
     bool runOnLoop(Loop *L, LPPassManager &LPM);
     bool processCurrentLoop();
 
     /// This transformation requires natural loop information & requires that
-    /// loop preheaders be inserted into the CFG...
+    /// loop preheaders be inserted into the CFG.
     ///
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequiredID(LoopSimplifyID);
@@ -110,7 +109,6 @@ namespace {
       AU.addRequiredID(LCSSAID);
       AU.addPreservedID(LCSSAID);
       AU.addPreserved<DominatorTree>();
-      AU.addPreserved<DominanceFrontier>();
     }
 
   private:
@@ -201,7 +199,6 @@ static Value *FindLIVLoopCondition(Value *Cond, Loop *L, bool &Changed) {
 bool LoopUnswitch::runOnLoop(Loop *L, LPPassManager &LPM_Ref) {
   LI = &getAnalysis<LoopInfo>();
   LPM = &LPM_Ref;
-  DF = getAnalysisIfAvailable<DominanceFrontier>();
   DT = getAnalysisIfAvailable<DominatorTree>();
   currentLoop = L;
   Function *F = currentLoop->getHeader()->getParent();
@@ -216,8 +213,6 @@ bool LoopUnswitch::runOnLoop(Loop *L, LPPassManager &LPM_Ref) {
     // FIXME: Reconstruct dom info, because it is not preserved properly.
     if (DT)
       DT->runOnFunction(*F);
-    if (DF)
-      DF->runOnFunction(*F);
   }
   return Changed;
 }
-- 
2.34.1