Do not use ETForest as well as DomiantorTree. DominatorTree is sufficient.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37501 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/Dominators.h

@@ -142,6 +142,16 @@ protected:
     return getNode(BB);
   }
 
+  /// getIDomBlock - return basic block BB's immediate domiantor basic block.
+  ///
+  BasicBlock *getIDomBlock(BasicBlock *BB) {
+    DomTreeNode *N = getNode(BB);
+    assert (N && "Missing dominator tree node");
+    DomTreeNode *I = N->getIDom();
+    assert (N && "Missing immediate dominator");
+    return I->getBlock();
+  }
+
   /// getRootNode - This returns the entry node for the CFG of the function.  If
   /// this tree represents the post-dominance relations for a function, however,
   /// this root may be a node with the block == NULL.  This is the case when

include/llvm/Transforms/Utils/FunctionUtils.h

@@ -24,13 +24,13 @@ namespace llvm {
 
   /// ExtractCodeRegion - rip out a sequence of basic blocks into a new function
   ///
-  Function* ExtractCodeRegion(ETForest &DS, DominatorTree& DT,
+  Function* ExtractCodeRegion(DominatorTree& DT,
                               const std::vector<BasicBlock*> &code,
                               bool AggregateArgs = false);
 
   /// ExtractLoop - rip out a natural loop into a new function
   ///
-  Function* ExtractLoop(ETForest &DS, DominatorTree& DT, Loop *L,
+  Function* ExtractLoop(DominatorTree& DT, Loop *L,
                         bool AggregateArgs = false);
 
   /// ExtractBasicBlock - rip out a basic block into a new function

lib/Transforms/IPO/LoopExtractor.cpp

@@ -45,7 +45,6 @@ namespace {
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequiredID(BreakCriticalEdgesID);
       AU.addRequiredID(LoopSimplifyID);
-      AU.addRequired<ETForest>();
       AU.addRequired<DominatorTree>();
       AU.addRequired<LoopInfo>();
     }
@@ -78,7 +77,6 @@ bool LoopExtractor::runOnFunction(Function &F) {
   if (LI.begin() == LI.end())
     return false;
 
-  ETForest &EF = getAnalysis<ETForest>();
   DominatorTree &DT = getAnalysis<DominatorTree>();
 
   // If there is more than one top-level loop in this function, extract all of
@@ -88,7 +86,7 @@ bool LoopExtractor::runOnFunction(Function &F) {
     for (LoopInfo::iterator i = LI.begin(), e = LI.end(); i != e; ++i) {
       if (NumLoops == 0) return Changed;
       --NumLoops;
-      Changed |= ExtractLoop(EF, DT, *i) != 0;
+      Changed |= ExtractLoop(DT, *i) != 0;
       ++NumExtracted;
     }
   } else {
@@ -118,7 +116,7 @@ bool LoopExtractor::runOnFunction(Function &F) {
     if (ShouldExtractLoop) {
       if (NumLoops == 0) return Changed;
       --NumLoops;
-      Changed |= ExtractLoop(EF, DT, TLL) != 0;
+      Changed |= ExtractLoop(DT, TLL) != 0;
       ++NumExtracted;
     } else {
       // Okay, this function is a minimal container around the specified loop.
@@ -128,7 +126,7 @@ bool LoopExtractor::runOnFunction(Function &F) {
       for (Loop::iterator i = TLL->begin(), e = TLL->end(); i != e; ++i) {
         if (NumLoops == 0) return Changed;
         --NumLoops;
-        Changed |= ExtractLoop(EF, DT, *i) != 0;
+        Changed |= ExtractLoop(DT, *i) != 0;
         ++NumExtracted;
       }
     }

lib/Transforms/Utils/CodeExtractor.cpp

@@ -44,14 +44,13 @@ namespace {
   class VISIBILITY_HIDDEN CodeExtractor {
     typedef std::vector<Value*> Values;
     std::set<BasicBlock*> BlocksToExtract;
-    ETForest *EF;
     DominatorTree* DT;
     bool AggregateArgs;
     unsigned NumExitBlocks;
     const Type *RetTy;
   public:
-    CodeExtractor(ETForest *ef = 0, DominatorTree* dt = 0, bool AggArgs = false)
-      : EF(ef), DT(dt), AggregateArgs(AggArgs||AggregateArgsOpt), NumExitBlocks(~0U) {}
+    CodeExtractor(DominatorTree* dt = 0, bool AggArgs = false)
+      : DT(dt), AggregateArgs(AggArgs||AggregateArgsOpt), NumExitBlocks(~0U) {}
 
     Function *ExtractCodeRegion(const std::vector<BasicBlock*> &code);
 
@@ -141,17 +140,17 @@ void CodeExtractor::severSplitPHINodes(BasicBlock *&Header) {
 
   // Okay, update dominator sets. The blocks that dominate the new one are the
   // blocks that dominate TIBB plus the new block itself.
-  if (EF) {
-    BasicBlock* idom = EF->getIDom(OldPred);
+  if (DT) {
+    DomTreeNode *OPNode = DT->getNode(OldPred);
+    DomTreeNode *IDomNode = OPNode->getIDom();
+    BasicBlock* idom = IDomNode->getBlock();
     DT->addNewBlock(NewBB, idom);
-    EF->addNewBlock(NewBB, idom);
 
     // Additionally, NewBB replaces OldPred as the immediate dominator of blocks
     Function *F = Header->getParent();
     for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I)
-      if (EF->getIDom(I) == OldPred) {
+      if (DT->getIDomBlock(I) == OldPred) {
         DT->changeImmediateDominator(I, NewBB);
-        EF->setImmediateDominator(I, NewBB);
       }
   }
 
@@ -509,12 +508,12 @@ emitCallAndSwitchStatement(Function *newFunction, BasicBlock *codeReplacer,
               // In the extract block case, if the block we are extracting ends
               // with an invoke instruction, make sure that we don't emit a
               // store of the invoke value for the unwind block.
-              if (!EF && DefBlock != OldTarget)
+              if (!DT && DefBlock != OldTarget)
                 DominatesDef = false;
             }
 
-            if (EF)
-              DominatesDef = EF->dominates(DefBlock, OldTarget);
+            if (DT)
+              DominatesDef = DT->dominates(DefBlock, OldTarget);
 
             if (DominatesDef) {
               if (AggregateArgs) {
@@ -728,16 +727,16 @@ bool CodeExtractor::isEligible(const std::vector<BasicBlock*> &code) {
 /// ExtractCodeRegion - slurp a sequence of basic blocks into a brand new
 /// function
 ///
-Function* llvm::ExtractCodeRegion(ETForest &EF, DominatorTree &DT,
+Function* llvm::ExtractCodeRegion(DominatorTree &DT,
                                   const std::vector<BasicBlock*> &code,
                                   bool AggregateArgs) {
-  return CodeExtractor(&EF, &DT, AggregateArgs).ExtractCodeRegion(code);
+  return CodeExtractor(&DT, AggregateArgs).ExtractCodeRegion(code);
 }
 
 /// ExtractBasicBlock - slurp a natural loop into a brand new function
 ///
-Function* llvm::ExtractLoop(ETForest &EF, DominatorTree &DF, Loop *L, bool AggregateArgs) {
-  return CodeExtractor(&EF, &DF, AggregateArgs).ExtractCodeRegion(L->getBlocks());
+Function* llvm::ExtractLoop(DominatorTree &DT, Loop *L, bool AggregateArgs) {
+  return CodeExtractor(&DT, AggregateArgs).ExtractCodeRegion(L->getBlocks());
 }
 
 /// ExtractBasicBlock - slurp a basic block into a brand new function
@@ -745,5 +744,5 @@ Function* llvm::ExtractLoop(ETForest &EF, DominatorTree &DF, Loop *L, bool Aggre
 Function* llvm::ExtractBasicBlock(BasicBlock *BB, bool AggregateArgs) {
   std::vector<BasicBlock*> Blocks;
   Blocks.push_back(BB);
-  return CodeExtractor(0, 0, AggregateArgs).ExtractCodeRegion(Blocks);
+  return CodeExtractor(0, AggregateArgs).ExtractCodeRegion(Blocks);
 }