lib/CodeGen/CodeGenPrepare.cpp

774     BasicBlock *SinglePred = BB->getSinglePredecessor();
777     if (!SinglePred || SinglePred == BB || BB->hasAddressTaken())
780     BranchInst *Term = dyn_cast<BranchInst>(SinglePred->getTerminator());
785       // Merge BB into SinglePred and delete it.
787       Preds.insert(SinglePred);
791         FreshBBs.insert(SinglePred);
1055   if (BasicBlock *SinglePred = DestBB->getSinglePredecessor()) {
1056     if (SinglePred != DestBB) {
1057       assert(SinglePred == BB &&
1059       // Merge DestBB into SinglePred/BB and delete it.
1061       // Note: BB(=SinglePred) will not be deleted on this path.
1063       LLVM_DEBUG(dbgs() << "AFTER:\n" << *SinglePred << "\n\n\n");
1067         FreshBBs.insert(SinglePred);