72     bool EliminatePHINodes(MachineFunction &MF, MachineBasicBlock &MBB);
73     void LowerPHINode(MachineBasicBlock &MBB,
85     bool SplitPHIEdges(MachineFunction &MF, MachineBasicBlock &MBB,
90     bool isLiveIn(unsigned Reg, const MachineBasicBlock *MBB);
91     bool isLiveOutPastPHIs(unsigned Reg, const MachineBasicBlock *MBB);
146     for (auto &MBB : MF)  in runOnMachineFunction()  local
147       Changed |= SplitPHIEdges(MF, MBB, MLI);  in runOnMachineFunction()
154   for (auto &MBB : MF)  in runOnMachineFunction()  local
155     Changed |= EliminatePHINodes(MF, MBB);  in runOnMachineFunction()
185                                              MachineBasicBlock &MBB) {  in EliminatePHINodes()  argument
186   if (MBB.empty() || !MBB.front().isPHI())  in EliminatePHINodes()
192     std::prev(MBB.SkipPHIsAndLabels(MBB.begin()));  in EliminatePHINodes()
194   while (MBB.front().isPHI())  in EliminatePHINodes()
195     LowerPHINode(MBB, LastPHIIt);  in EliminatePHINodes()
223 void PHIElimination::LowerPHINode(MachineBasicBlock &MBB,  in LowerPHINode()  argument
230   MachineInstr *MPhi = MBB.remove(&*MBB.begin());  in LowerPHINode()
238   MachineFunction &MF = *MBB.getParent();  in LowerPHINode()
249     BuildMI(MBB, AfterPHIsIt, MPhi->getDebugLoc(),  in LowerPHINode()
265     BuildMI(MBB, AfterPHIsIt, MPhi->getDebugLoc(),  in LowerPHINode()
284         if (MachineInstr *OldKill = VI.findKill(&MBB)) {  in LowerPHINode()
287           DEBUG(MBB.dump());  in LowerPHINode()
314     SlotIndex MBBStartIndex = LIS->getMBBStartIdx(&MBB);  in LowerPHINode()
380       findPHICopyInsertPoint(&opBlock, &MBB, SrcReg);  in LowerPHINode()
537   for (const auto &MBB : MF)  in analyzePHINodes()  local
538     for (const auto &BBI : MBB) {  in analyzePHINodes()
548                                    MachineBasicBlock &MBB,  in SplitPHIEdges()  argument
550   if (MBB.empty() || !MBB.front().isPHI() || MBB.isEHPad())  in SplitPHIEdges()
553   const MachineLoop *CurLoop = MLI ? MLI->getLoopFor(&MBB) : nullptr;  in SplitPHIEdges()
554   bool IsLoopHeader = CurLoop && &MBB == CurLoop->getHeader();  in SplitPHIEdges()
557   for (MachineBasicBlock::iterator BBI = MBB.begin(), BBE = MBB.end();  in SplitPHIEdges()
568       if (PreMBB == &MBB && !SplitAllCriticalEdges)  in SplitPHIEdges()
585                      << PreMBB->getNumber() << " -> BB#" << MBB.getNumber()  in SplitPHIEdges()
597       ShouldSplit = ShouldSplit && !isLiveIn(Reg, &MBB);  in SplitPHIEdges()
614       if (!PreMBB->SplitCriticalEdge(&MBB, *this)) {  in SplitPHIEdges()
625 bool PHIElimination::isLiveIn(unsigned Reg, const MachineBasicBlock *MBB) {  in isLiveIn()  argument
629     return LIS->isLiveInToMBB(LIS->getInterval(Reg), MBB);  in isLiveIn()
631     return LV->isLiveIn(Reg, *MBB);  in isLiveIn()
635                                        const MachineBasicBlock *MBB) {  in isLiveOutPastPHIs()  argument
645     for (const MachineBasicBlock *SI : MBB->successors())  in isLiveOutPastPHIs()
650     return LV->isLiveOut(Reg, *MBB);  in isLiveOutPastPHIs()