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Don't crash on a query where the block is not in any loop. Thanks to 

Sameer D. Sahasrabuddhe for pointing this out!

llvm-svn: 22314
This commit is contained in:
Chris Lattner 2005-06-29 17:41:25 +00:00
parent 51e2a48b35
commit f550554c02
1 changed files with 2 additions and 1 deletions
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3
llvm/include/llvm/Analysis/LoopInfo.h
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@ -250,7 +250,8 @@ public:
// isLoopHeader - True if the block is a loop header node // isLoopHeader - True if the block is a loop header node
bool isLoopHeader(BasicBlock *BB) const { bool isLoopHeader(BasicBlock *BB) const {
return getLoopFor(BB)->getHeader() == BB; const Loop *L = getLoopFor(BB);
return L && L->getHeader() == BB;
} }
/// runOnFunction - Calculate the natural loop information. /// runOnFunction - Calculate the natural loop information.