325 static unsigned ComputeCommonTailLength(MachineBasicBlock *MBB1,  in ComputeCommonTailLength()  argument
329   MachineBasicBlock::iterator MBBI1 = MBB1->end();  in ComputeCommonTailLength()
334     MBBI1 = skipBackwardPastNonInstructions(MBBI1, MBB1);  in ComputeCommonTailLength()
336     if (MBBI1 == MBB1->end() || MBBI2 == MBB2->end())  in ComputeCommonTailLength()
538 ProfitableToMerge(MachineBasicBlock *MBB1, MachineBasicBlock *MBB2,  in ProfitableToMerge()  argument
549     auto EHScope1 = EHScopeMembership.find(MBB1);  in ProfitableToMerge()
557   CommonTailLen = ComputeCommonTailLength(MBB1, MBB2, I1, I2);  in ProfitableToMerge()
560   LLVM_DEBUG(dbgs() << "Common tail length of " << printMBBReference(*MBB1)  in ProfitableToMerge()
567   if (skipDebugInstructionsForward(MBB1->begin(), MBB1->end(), false) == I1)  in ProfitableToMerge()
568     I1 = MBB1->begin();  in ProfitableToMerge()
572   bool FullBlockTail1 = I1 == MBB1->begin();  in ProfitableToMerge()
580   if ((MBB1 == PredBB || MBB2 == PredBB) &&  in ProfitableToMerge()
581       (!AfterPlacement || MBB1->succ_size() == 1)) {  in ProfitableToMerge()
583     unsigned NumTerms = CountTerminators(MBB1 == PredBB ? MBB2 : MBB1, I);  in ProfitableToMerge()
594       blockEndsInUnreachable(MBB1) && blockEndsInUnreachable(MBB2))  in ProfitableToMerge()
601   if (MBB1->isLayoutSuccessor(MBB2) && FullBlockTail2)  in ProfitableToMerge()
603   if (MBB2->isLayoutSuccessor(MBB1) && FullBlockTail1)  in ProfitableToMerge()
618     if (!BothFallThrough(MBB1) || !BothFallThrough(MBB2))  in ProfitableToMerge()
628   if (SuccBB && MBB1 != PredBB && MBB2 != PredBB &&  in ProfitableToMerge()
629       (MBB1->succ_size() == 1 || !AfterPlacement) &&  in ProfitableToMerge()
630       !MBB1->back().isBarrier() &&  in ProfitableToMerge()
642   MachineFunction *MF = MBB1->getParent();  in ProfitableToMerge()
645       (llvm::shouldOptimizeForSize(MBB1, PSI, &MBBFreqInfo) &&  in ProfitableToMerge()
1240 static bool IsBetterFallthrough(MachineBasicBlock *MBB1,  in IsBetterFallthrough()  argument
1242   assert(MBB1 && MBB2 && "Unknown MachineBasicBlock");  in IsBetterFallthrough()
1248   MachineBasicBlock::iterator MBB1I = MBB1->getLastNonDebugInstr();  in IsBetterFallthrough()
1250   if (MBB1I == MBB1->end() || MBB2I == MBB2->end())  in IsBetterFallthrough()
1255   if (MBB1->isSuccessor(MBB2)) return true;  in IsBetterFallthrough()
1256   if (MBB2->isSuccessor(MBB1)) return false;  in IsBetterFallthrough()