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R600/SI: Check for empty stack in SIAnnotateControlFlow::isTopOfStack

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Fixes assertion failure in newly added lit test. Might just be a bandaid that
needs to be revisited.

llvm-svn: 175139
This commit is contained in:
Michel Danzer 2013-02-14 08:00:33 +00:00
parent df0219c9ba
commit 746ff11dfb
1 changed files with 1 additions and 1 deletions
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2
lib/Target/R600/SIAnnotateControlFlow.cpp
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@ -147,7 +147,7 @@ bool SIAnnotateControlFlow::doInitialization(Module &M) {
/// \brief Is BB the last block saved on the stack ?
bool SIAnnotateControlFlow::isTopOfStack(BasicBlock *BB) {
return Stack.back().first == BB;
return !Stack.empty() && Stack.back().first == BB;
}
/// \brief Pop the last saved value from the control flow stack