From 6d0cc55ef3f3f3c5829e3cc2bab841fd74b0f8cb Mon Sep 17 00:00:00 2001 From: Devang Patel Date: Wed, 18 Jun 2008 02:12:09 +0000 Subject: [PATCH] Check empty dominance frontier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52437 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/Analysis/Dominators.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/llvm/Analysis/Dominators.h b/include/llvm/Analysis/Dominators.h index 6ce3260b8f5..52171d7e12c 100644 --- a/include/llvm/Analysis/Dominators.h +++ b/include/llvm/Analysis/Dominators.h @@ -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) { -- 2.34.1