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SplitBlock should only attempt to update LoopInfo if it is actually being used.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-10-03 06:55:35 +00:00
parent 91b6f97ce4
commit a90793b431
1 changed files with 3 additions and 4 deletions
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7
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -240,16 +240,15 @@ BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
/// the loop info is updated. /// the loop info is updated.
/// ///
BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) { BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
LoopInfo &LI = P->getAnalysis<LoopInfo>();
BasicBlock::iterator SplitIt = SplitPt; BasicBlock::iterator SplitIt = SplitPt;
while (isa<PHINode>(SplitIt)) while (isa<PHINode>(SplitIt))
++SplitIt; ++SplitIt;
BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split"); BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split");
// The new block lives in whichever loop the old one did. // The new block lives in whichever loop the old one did.
if (Loop *L = LI.getLoopFor(Old)) if (LoopInfo* LI = P->getAnalysisToUpdate<LoopInfo>())
L->addBasicBlockToLoop(New, LI.getBase()); if (Loop *L = LI->getLoopFor(Old))
L->addBasicBlockToLoop(New, LI->getBase());
if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>()) if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>())
{ {