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Check empty dominance frontier.

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llvm-svn: 52437
This commit is contained in:
Devang Patel 2008-06-18 02:12:09 +00:00
parent c190d65454
commit 960d6ae6d1
1 changed files with 3 additions and 0 deletions
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3
include/llvm/Analysis/Dominators.h
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@ -944,6 +944,9 @@ public:
// itself is not member of NewBB's dominance frontier.
DominanceFrontier::iterator NewDFI = find(NewBB);
DominanceFrontier::iterator DFI = find(BB);
// If BB was an entry block then its frontier is empty.
if (DFI == end())
return;
DominanceFrontier::DomSetType BBSet = DFI->second;
for (DominanceFrontier::DomSetType::iterator BBSetI = BBSet.begin(),
BBSetE = BBSet.end(); BBSetI != BBSetE; ++BBSetI) {