Remove code for updating dominance frontiers and some outdated references to

dominance and post-dominance frontiers.

llvm-svn: 123725

1 files changed, 1 insertions, 5 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopDeletion.cpp b/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
index b60f0c38..6d1d344 100644
--- a/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
@@ -17,7 +17,7 @@
 #define DEBUG_TYPE "loop-delete"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Analysis/LoopPass.h"
-#include "llvm/Analysis/DominanceFrontier.h"
+#include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/SmallVector.h"
@@ -52,7 +52,6 @@ namespace {
       AU.addPreserved<LoopInfo>();
       AU.addPreservedID(LoopSimplifyID);
       AU.addPreservedID(LCSSAID);
-      AU.addPreserved<DominanceFrontier>();
     }
   };
 }
@@ -193,7 +192,6 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
   // Update the dominator tree and remove the instructions and blocks that will
   // be deleted from the reference counting scheme.
   DominatorTree& DT = getAnalysis<DominatorTree>();
-  DominanceFrontier* DF = getAnalysisIfAvailable<DominanceFrontier>();
   SmallVector<DomTreeNode*, 8> ChildNodes;
   for (Loop::block_iterator LI = L->block_begin(), LE = L->block_end();
        LI != LE; ++LI) {
@@ -203,12 +201,10 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
     for (SmallVector<DomTreeNode*, 8>::iterator DI = ChildNodes.begin(),
          DE = ChildNodes.end(); DI != DE; ++DI) {
       DT.changeImmediateDominator(*DI, DT[preheader]);
-      if (DF) DF->changeImmediateDominator((*DI)->getBlock(), preheader, &DT);
     }
     
     ChildNodes.clear();
     DT.eraseNode(*LI);
-    if (DF) DF->removeBlock(*LI);
 
     // Remove the block from the reference counting scheme, so that we can
     // delete it freely later.