Remove code for updating dominance frontiers and some outdated references to

dominance and post-dominance frontiers.

llvm-svn: 123725

1 files changed, 5 insertions, 12 deletions

diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index c5b97070494..5d3af3759a0 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -19,7 +19,7 @@
 #include "llvm/Constant.h"
 #include "llvm/Type.h"
 #include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/DominanceFrontier.h"
+#include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/MemoryDependenceAnalysis.h"
 #include "llvm/Target/TargetData.h"
@@ -311,9 +311,6 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
         DT->changeImmediateDominator(*I, NewNode);
   }
 
-  if (DominanceFrontier *DF = P->getAnalysisIfAvailable<DominanceFrontier>())
-    DF->splitBlock(Old);
-    
   return New;
 }
 
@@ -325,10 +322,9 @@ BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
 /// suffix of 'Suffix'.
 ///
 /// This currently updates the LLVM IR, AliasAnalysis, DominatorTree,
-/// DominanceFrontier, LoopInfo, and LCCSA but no other analyses.
-/// In particular, it does not preserve LoopSimplify (because it's
-/// complicated to handle the case where one of the edges being split
-/// is an exit of a loop with other exits).
+/// LoopInfo, and LCCSA but no other analyses. In particular, it does not
+/// preserve LoopSimplify (because it's complicated to handle the case where one
+/// of the edges being split is an exit of a loop with other exits).
 ///
 BasicBlock *llvm::SplitBlockPredecessors(BasicBlock *BB, 
                                          BasicBlock *const *Preds,
@@ -378,13 +374,10 @@ BasicBlock *llvm::SplitBlockPredecessors(BasicBlock *BB,
     }
   }
 
-  // Update dominator tree and dominator frontier if available.
+  // Update dominator tree if available.
   DominatorTree *DT = P ? P->getAnalysisIfAvailable<DominatorTree>() : 0;
   if (DT)
     DT->splitBlock(NewBB);
-  if (DominanceFrontier *DF =
-        P ? P->getAnalysisIfAvailable<DominanceFrontier>() : 0)
-    DF->splitBlock(NewBB);
 
   // Insert a new PHI node into NewBB for every PHI node in BB and that new PHI
   // node becomes an incoming value for BB's phi node.  However, if the Preds