Author: dpatel
Date: Fri Jul 27 14:13:43 2007
New Revision: 40564
URL: http://llvm.org/viewvc/llvm-project?rev=40564&view=rev
Log:
Fix edge cases in handling basic block split.
Modified:
llvm/trunk/lib/VMCore/Dominators.cpp
Modified: llvm/trunk/lib/VMCore/Dominators.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/Dominators.cpp?rev=40564&r1=40563&r2=40564&view=diff
==============================================================================
--- llvm/trunk/lib/VMCore/Dominators.cpp (original)
+++ llvm/trunk/lib/VMCore/Dominators.cpp Fri Jul 27 14:13:43 2007
@@ -616,7 +616,11 @@
PI != PE; ++PI)
PredBlocks.push_back(*PI);
- assert(!PredBlocks.empty() && "No predblocks??");
+ if (PredBlocks.empty())
+ // If NewBB does not have any predecessors then it is a entry block.
+ // In this case, NewBB and its successor NewBBSucc dominates all
+ // other blocks.
+ return;
DominatorTree &DT = getAnalysis<DominatorTree>();
bool NewBBDominatesNewBBSucc = true;
@@ -643,8 +647,13 @@
else
++SetI;
}
-
- addBasicBlock(NewBB, Set);
+
+ DominanceFrontier::iterator NewBBI = find(NewBB);
+ if (NewBBI != end()) {
+ DominanceFrontier::DomSetType NewBBSet = NewBBI->second;
+ NewBBSet.insert(Set.begin(), Set.end());
+ } else
+ addBasicBlock(NewBB, Set);
}
} else {
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