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Remove code for updating dominance frontiers and some outdated references to

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dominance and post-dominance frontiers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich
2011-01-18 04:11:31 +00:00
parent b1686c32fc
commit 301278719b
7 changed files with 21 additions and 105 deletions
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12
lib/Transforms/Utils/LoopSimplify.cpp
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@ -46,7 +46,7 @@
#include "llvm/LLVMContext.h"
#include "llvm/Type.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolution.h"
@ -90,7 +90,6 @@ namespace {
AU.addPreserved<AliasAnalysis>();
AU.addPreserved<ScalarEvolution>();
AU.addPreservedID(BreakCriticalEdgesID); // No critical edges added.
AU.addPreserved<DominanceFrontier>();
}
/// verifyAnalysis() - Verify LoopSimplifyForm's guarantees.
@ -322,7 +321,7 @@ ReprocessLoop:
if (!FoldBranchToCommonDest(BI)) continue;
// Success. The block is now dead, so remove it from the loop,
// update the dominator tree and dominance frontier, and delete it.
// update the dominator tree and delete it.
DEBUG(dbgs() << "LoopSimplify: Eliminating exiting block "
<< ExitingBlock->getName() << "\n");
@ -330,19 +329,14 @@ ReprocessLoop:
Changed = true;
LI->removeBlock(ExitingBlock);
DominanceFrontier *DF = getAnalysisIfAvailable<DominanceFrontier>();
DomTreeNode *Node = DT->getNode(ExitingBlock);
const std::vector<DomTreeNodeBase<BasicBlock> *> &Children =
Node->getChildren();
while (!Children.empty()) {
DomTreeNode *Child = Children.front();
DT->changeImmediateDominator(Child, Node->getIDom());
if (DF) DF->changeImmediateDominator(Child->getBlock(),
Node->getIDom()->getBlock(),
DT);
}
DT->eraseNode(ExitingBlock);
if (DF) DF->removeBlock(ExitingBlock);
BI->getSuccessor(0)->removePredecessor(ExitingBlock);
BI->getSuccessor(1)->removePredecessor(ExitingBlock);
@ -720,8 +714,6 @@ LoopSimplify::InsertUniqueBackedgeBlock(Loop *L, BasicBlock *Preheader) {
// Update dominator information
DT->splitBlock(BEBlock);
if (DominanceFrontier *DF = getAnalysisIfAvailable<DominanceFrontier>())
DF->splitBlock(BEBlock);
return BEBlock;
}