520     void ConvertVPTBlocks(LowOverheadLoop &LoLoop);
522     MachineInstr *ExpandLoopStart(LowOverheadLoop &LoLoop);
524     void Expand(LowOverheadLoop &LoLoop);
526     void IterationCountDCE(LowOverheadLoop &LoLoop);
1360   LowOverheadLoop LoLoop(*ML, *MLI, *RDA, *TRI, *TII);  in ProcessLoop()  local
1364   if (LoLoop.Preheader)  in ProcessLoop()
1365     LoLoop.Start = SearchForStart(LoLoop.Preheader);  in ProcessLoop()
1377         LoLoop.Dec = &MI;  in ProcessLoop()
1379         LoLoop.End = &MI;  in ProcessLoop()
1381         LoLoop.End = LoLoop.Dec = &MI;  in ProcessLoop()
1383         LoLoop.Start = &MI;  in ProcessLoop()
1388         LoLoop.Revert = true;  in ProcessLoop()
1393         LoLoop.AnalyseMVEInst(&MI);  in ProcessLoop()
1398   LLVM_DEBUG(LoLoop.dump());  in ProcessLoop()
1399   if (!LoLoop.FoundAllComponents()) {  in ProcessLoop()
1404   assert(LoLoop.Start->getOpcode() != ARM::t2WhileLoopStart &&  in ProcessLoop()
1410   if (LoLoop.Dec != LoLoop.End) {  in ProcessLoop()
1412     RDA->getReachingLocalUses(LoLoop.Dec, MCRegister::from(ARM::LR), Uses);  in ProcessLoop()
1413     if (Uses.size() > 1 || !Uses.count(LoLoop.End)) {  in ProcessLoop()
1415       LoLoop.Revert = true;  in ProcessLoop()
1418   LoLoop.Validate(BBUtils.get());  in ProcessLoop()
1419   Expand(LoLoop);  in ProcessLoop()
1524 void ARMLowOverheadLoops::IterationCountDCE(LowOverheadLoop &LoLoop) {  in IterationCountDCE()  argument
1525   if (!LoLoop.IsTailPredicationLegal())  in IterationCountDCE()
1530   MachineInstr *Def = RDA->getMIOperand(LoLoop.Start, 1);  in IterationCountDCE()
1537   SmallPtrSet<MachineInstr*, 4> Killed  = { LoLoop.Start, LoLoop.Dec,  in IterationCountDCE()
1538                                             LoLoop.End };  in IterationCountDCE()
1539   if (!TryRemove(Def, *RDA, LoLoop.ToRemove, Killed))  in IterationCountDCE()
1543 MachineInstr* ARMLowOverheadLoops::ExpandLoopStart(LowOverheadLoop &LoLoop) {  in ExpandLoopStart()  argument
1547   IterationCountDCE(LoLoop);  in ExpandLoopStart()
1549   MachineBasicBlock::iterator InsertPt = LoLoop.StartInsertPt;  in ExpandLoopStart()
1550   MachineInstr *Start = LoLoop.Start;  in ExpandLoopStart()
1551   MachineBasicBlock *MBB = LoLoop.StartInsertBB;  in ExpandLoopStart()
1552   unsigned Opc = LoLoop.getStartOpcode();  in ExpandLoopStart()
1553   MachineOperand &Count = LoLoop.getLoopStartOperand();  in ExpandLoopStart()
1574   LoLoop.ToRemove.insert(Start);  in ExpandLoopStart()
1578 void ARMLowOverheadLoops::ConvertVPTBlocks(LowOverheadLoop &LoLoop) {  in ConvertVPTBlocks()  argument
1591   for (auto &Block : LoLoop.getVPTBlocks()) {  in ConvertVPTBlocks()
1608       LoLoop.BlockMasksToRecompute.insert(MIB.getInstr());  in ConvertVPTBlocks()
1609       LoLoop.ToRemove.insert(TheVCMP);  in ConvertVPTBlocks()
1662             LoLoop.BlockMasksToRecompute.insert(MIB.getInstr());  in ConvertVPTBlocks()
1671       LoLoop.ToRemove.insert(VPST);  in ConvertVPTBlocks()
1679         LoLoop.ToRemove.insert(VPST);  in ConvertVPTBlocks()
1681         LoLoop.BlockMasksToRecompute.insert(VPST);  in ConvertVPTBlocks()
1693           !LoLoop.ToRemove.contains(VprDef)) {  in ConvertVPTBlocks()
1706           LoLoop.ToRemove.insert(VPST);  in ConvertVPTBlocks()
1712   LoLoop.ToRemove.insert(LoLoop.VCTPs.begin(), LoLoop.VCTPs.end());  in ConvertVPTBlocks()
1715 void ARMLowOverheadLoops::Expand(LowOverheadLoop &LoLoop) {  in Expand()  argument
1718   auto ExpandLoopEnd = [this](LowOverheadLoop &LoLoop) {  in Expand()  argument
1719     MachineInstr *End = LoLoop.End;  in Expand()
1721     unsigned Opc = LoLoop.IsTailPredicationLegal() ?  in Expand()
1726     unsigned Off = LoLoop.Dec == LoLoop.End ? 1 : 0;  in Expand()
1730     LoLoop.ToRemove.insert(LoLoop.Dec);  in Expand()
1731     LoLoop.ToRemove.insert(End);  in Expand()
1777   if (LoLoop.Revert) {  in Expand()
1778     if (isWhileLoopStart(*LoLoop.Start))  in Expand()
1779       RevertWhile(LoLoop.Start);  in Expand()
1781       RevertDo(LoLoop.Start);  in Expand()
1782     if (LoLoop.Dec == LoLoop.End)  in Expand()
1783       RevertLoopEndDec(LoLoop.End);  in Expand()
1785       RevertLoopEnd(LoLoop.End, RevertLoopDec(LoLoop.Dec));  in Expand()
1787     ExpandVMOVCopies(LoLoop.VMOVCopies);  in Expand()
1788     LoLoop.Start = ExpandLoopStart(LoLoop);  in Expand()
1789     if (LoLoop.Start)  in Expand()
1790       RemoveDeadBranch(LoLoop.Start);  in Expand()
1791     LoLoop.End = ExpandLoopEnd(LoLoop);  in Expand()
1792     RemoveDeadBranch(LoLoop.End);  in Expand()
1793     if (LoLoop.IsTailPredicationLegal())  in Expand()
1794       ConvertVPTBlocks(LoLoop);  in Expand()
1795     for (auto *I : LoLoop.ToRemove) {  in Expand()
1799     for (auto *I : LoLoop.BlockMasksToRecompute) {  in Expand()
1806   PostOrderLoopTraversal DFS(LoLoop.ML, *MLI);  in Expand()