SplitBlock should only attempt to update LoopInfo if it is actually being used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56994 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/BasicBlockUtils.cpp b/lib/Transforms/Utils/BasicBlockUtils.cpp
index a98e135..1b018cb 100644
--- a/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -240,16 +240,15 @@
/// the loop info is updated.
///
BasicBlock *llvm::SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P) {
-
- LoopInfo &LI = P->getAnalysis<LoopInfo>();
BasicBlock::iterator SplitIt = SplitPt;
while (isa<PHINode>(SplitIt))
++SplitIt;
BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split");
// The new block lives in whichever loop the old one did.
- if (Loop *L = LI.getLoopFor(Old))
- L->addBasicBlockToLoop(New, LI.getBase());
+ if (LoopInfo* LI = P->getAnalysisToUpdate<LoopInfo>())
+ if (Loop *L = LI->getLoopFor(Old))
+ L->addBasicBlockToLoop(New, LI->getBase());
if (DominatorTree *DT = P->getAnalysisToUpdate<DominatorTree>())
{