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...t I think the >> comment and assert may not be. I was writing a patch where I hit the same >> issue. >> >> Cameron > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20110124/6266c0ec/attachment.html>

There might be a misuse of DominatorTree::splitBasicBlock in CodeExtractor.cpp, line 145. Header is splited into two (OldPred->NewBB). Line 145 updates the dominator tree by calling DT->splitBasicBlock(NewBB). I think it should be DT->splitBasicBlock(OldPred). When I tried to extract a code region whose header has 2 successors, my pass crashed. It was because header (or OldPred) is the