423   bool canMergeBlocks(const BasicBlock *BB, const BasicBlock *DestBB) const;
425   bool isMergingEmptyBlockProfitable(BasicBlock *BB, BasicBlock *DestBB,
908   BasicBlock *DestBB = BI->getSuccessor(0);  in findDestBlockOfMergeableEmptyBlock()  local
909   if (DestBB == BB)  in findDestBlockOfMergeableEmptyBlock()
912   if (!canMergeBlocks(BB, DestBB))  in findDestBlockOfMergeableEmptyBlock()
913     DestBB = nullptr;  in findDestBlockOfMergeableEmptyBlock()
915   return DestBB;  in findDestBlockOfMergeableEmptyBlock()
948     BasicBlock *DestBB = findDestBlockOfMergeableEmptyBlock(BB);  in eliminateMostlyEmptyBlocks()  local
949     if (!DestBB ||  in eliminateMostlyEmptyBlocks()
950         !isMergingEmptyBlockProfitable(BB, DestBB, Preheaders.count(BB)))  in eliminateMostlyEmptyBlocks()
960                                                    BasicBlock *DestBB,  in isMergingEmptyBlockProfitable()  argument
977         if (DestBB == CBI->getSuccessor(i))  in isMergingEmptyBlockProfitable()
1008   if (!isa<PHINode>(DestBB->begin()))  in isMergingEmptyBlockProfitable()
1015   for (BasicBlock *DestBBPred : predecessors(DestBB)) {  in isMergingEmptyBlockProfitable()
1019     if (llvm::all_of(DestBB->phis(), [&](const PHINode &DestPN) {  in isMergingEmptyBlockProfitable()
1037         DestBB == findDestBlockOfMergeableEmptyBlock(SameValueBB))  in isMergingEmptyBlockProfitable()
1048                                     const BasicBlock *DestBB) const {  in canMergeBlocks()
1055       if (UI->getParent() != DestBB || !isa<PHINode>(UI))  in canMergeBlocks()
1060       if (UI->getParent() == DestBB) {  in canMergeBlocks()
1075   const PHINode *DestBBPN = dyn_cast<PHINode>(DestBB->begin());  in canMergeBlocks()
1093       for (const PHINode &PN : DestBB->phis()) {  in canMergeBlocks()
1132   BasicBlock *DestBB = BI->getSuccessor(0);  in eliminateMostlyEmptyBlock()  local
1135                     << *BB << *DestBB);  in eliminateMostlyEmptyBlock()
1139   if (BasicBlock *SinglePred = DestBB->getSinglePredecessor()) {  in eliminateMostlyEmptyBlock()
1140     if (SinglePred != DestBB) {  in eliminateMostlyEmptyBlock()
1144       MergeBlockIntoPredecessor(DestBB);  in eliminateMostlyEmptyBlock()
1152         FreshBBs.erase(DestBB);  in eliminateMostlyEmptyBlock()
1160   for (PHINode &PN : DestBB->phis()) {  in eliminateMostlyEmptyBlock()
1187   BB->replaceAllUsesWith(DestBB);  in eliminateMostlyEmptyBlock()
1191   LLVM_DEBUG(dbgs() << "AFTER:\n" << *DestBB << "\n\n\n");  in eliminateMostlyEmptyBlock()