lib/CodeGen/BranchFolding.cpp

529                               MachineBasicBlock *PredBB) {
539   if (MBB1 == PredBB || MBB2 == PredBB) {
541     unsigned NumTerms = CountTerminators(MBB1 == PredBB ? MBB2 : MBB1, I);
559   if (SuccBB && MBB1 != PredBB && MBB2 != PredBB &&
595                                         MachineBasicBlock *PredBB) {
609                             SuccBB, PredBB)) {
631                                         MachineBasicBlock *PredBB) {
638     if (SuccBB && CurMBB != PredBB)
650 bool BranchFolder::CreateCommonTailOnlyBlock(MachineBasicBlock *&PredBB,
657     // Use PredBB if possible; that doesn't require a new branch.
658     if (SameTails[i].getBlock() == PredBB) {
695   // If we split PredBB, newMBB is the new predecessor.
696   if (PredBB == MBB)
697     PredBB = newMBB;
708 // if any, is given in PredBB.
711                                       MachineBasicBlock *PredBB) {
725           if (PredBB)
727                    << PredBB->getNumber() << "\n";
746                                                     SuccBB, PredBB);
751       RemoveBlocksWithHash(CurHash, SuccBB, PredBB);
757     // tail at once.  Use PredBB if that is one of the possibilities, as that
780         if (MBB == PredBB) {
790         (SameTails[commonTailIndex].getBlock() == PredBB &&
794       if (!CreateCommonTailOnlyBlock(PredBB, SuccBB,
796         RemoveBlocksWithHash(CurHash, SuccBB, PredBB);
872     MachineBasicBlock *PredBB = prior(I);
950       MadeChange |= TryTailMergeBlocks(IBB, PredBB);
954     PredBB = prior(I);     // this may have been changed in TryTailMergeBlocks
956         MergePotentials.begin()->getBlock() != PredBB)
1203       // We have to be careful that the succs of PredBB aren't both no-successor
1204       // blocks.  If neither have successors and if PredBB is the second from
1374         MachineBasicBlock *PredBB = *PI;
1375         MachineFunction::iterator PredFallthrough = PredBB; ++PredFallthrough;
1378         if (PredBB != MBB && !PredBB->canFallThrough() &&
1379             !TII->AnalyzeBranch(*PredBB, PredTBB, PredFBB, PredCond, true)
1381             && (!CurFallsThru || MBB->getNumber() >= PredBB->getNumber())) {
1397           MBB->moveAfter(PredBB);