lib/CodeGen/BranchFolding.cpp

568                   MachineBasicBlock *PredBB,
589   if (MBB1 == PredBB || MBB2 == PredBB) {
591     unsigned NumTerms = CountTerminators(MBB1 == PredBB ? MBB2 : MBB1, I);
609   if (SuccBB && MBB1 != PredBB && MBB2 != PredBB &&
640                                         MachineBasicBlock *PredBB) {
653                             SuccBB, PredBB,
676                                         MachineBasicBlock *PredBB) {
683     if (SuccBB && CurMBB != PredBB)
695 bool BranchFolder::CreateCommonTailOnlyBlock(MachineBasicBlock *&PredBB,
702     // Use PredBB if possible; that doesn't require a new branch.
703     if (SameTails[i].getBlock() == PredBB) {
740   // If we split PredBB, newMBB is the new predecessor.
741   if (PredBB == MBB)
742     PredBB = newMBB;
796 // if any, is given in PredBB.
799                                       MachineBasicBlock *PredBB) {
813           if (PredBB)
815                    << PredBB->getNumber() << "\n";
834                                                     SuccBB, PredBB);
839       RemoveBlocksWithHash(CurHash, SuccBB, PredBB);
845     // tail at once.  Use PredBB if that is one of the possibilities, as that
868         if (MBB == PredBB) {
878         (SameTails[commonTailIndex].getBlock() == PredBB &&
882       if (!CreateCommonTailOnlyBlock(PredBB, SuccBB,
884         RemoveBlocksWithHash(CurHash, SuccBB, PredBB);
965     MachineBasicBlock *PredBB = &*std::prev(I);
1047       MadeChange |= TryTailMergeBlocks(IBB, PredBB);
1051     PredBB = &*std::prev(I); // this may have been changed in TryTailMergeBlocks
1053         MergePotentials.begin()->getBlock() != PredBB)
1341       // We have to be careful that the succs of PredBB aren't both no-successor
1342       // blocks.  If neither have successors and if PredBB is the second from
1500       for (MachineBasicBlock *PredBB : MBB->predecessors()) {
1504         if (PredBB != MBB && !PredBB->canFallThrough() &&
1505             !TII->AnalyzeBranch(*PredBB, PredTBB, PredFBB, PredCond, true)
1507             && (!CurFallsThru || MBB->getNumber() >= PredBB->getNumber())) {
1523           MBB->moveAfter(PredBB);