1 //===- LiveIntervalCalc.cpp - Calculate live interval --------------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
11 //===----------------------------------------------------------------------===//
32 static void createDeadDef(SlotIndexes &Indexes, VNInfo::Allocator &Alloc,  in createDeadDef()  argument
39   LR.createDeadDef(DefIdx, Alloc);  in createDeadDef()
45   VNInfo::Allocator *Alloc = getVNAlloc();  in calculate()  local
52   const TargetRegisterInfo &TRI = *MRI->getTargetRegisterInfo();  in calculate()
54   for (const MachineOperand &MO : MRI->reg_nodbg_operands(Reg)) {  in calculate()
61                                         : MRI->getMaxLaneMaskForVReg(Reg);  in calculate()
65         LaneBitmask ClassMask = MRI->getMaxLaneMaskForVReg(Reg);  in calculate()
66         LI.createSubRangeFrom(*Alloc, ClassMask, LI);  in calculate()
70           *Alloc, SubMask,  in calculate()
71           [&MO, Indexes, Alloc](LiveInterval::SubRange &SR) {  in calculate()
73               createDeadDef(*Indexes, *Alloc, SR, MO);  in calculate()
81       createDeadDef(*Indexes, *Alloc, LI, MO);  in calculate()
84   // We may have created empty live ranges for partially undefined uses, we  in calculate()
95       SubLIC.reset(MF, Indexes, DomTree, Alloc);  in calculate()
112   VNInfo::Allocator *Alloc = getVNAlloc();  in constructMainRangeFromSubranges()  local
115       if (!VNI->isUnused() && !VNI->isPHIDef())  in constructMainRangeFromSubranges()
116         MainRange.createDeadDef(VNI->def, *Alloc);  in constructMainRangeFromSubranges()
126   VNInfo::Allocator *Alloc = getVNAlloc();  in createDeadDefs()  local
131   for (MachineOperand &MO : MRI->def_operands(Reg))  in createDeadDefs()
132     createDeadDef(*Indexes, *Alloc, LR, MO);  in createDeadDefs()
141     LI->computeSubRangeUndefs(Undefs, Mask, *MRI, *Indexes);  in extendToUses()
145   const TargetRegisterInfo &TRI = *MRI->getTargetRegisterInfo();  in extendToUses()
146   for (MachineOperand &MO : MRI->reg_nodbg_operands(Reg)) {  in extendToUses()
153     // interval). For subranges, definitions of non-overlapping subregisters  in extendToUses()
170     unsigned OpNo = (&MO - &MI->getOperand(0));  in extendToUses()
172     if (MI->isPHI()) {  in extendToUses()
176       UseIdx = Indexes->getMBBEndIdx(MI->getOperand(OpNo + 1).getMBB());  in extendToUses()
178       // Check for early-clobber redefs.  in extendToUses()
183       else if (MI->isRegTiedToDefOperand(OpNo, &DefIdx)) {  in extendToUses()
184         // FIXME: This would be a lot easier if tied early-clobber uses also  in extendToUses()
185         // had an early-clobber flag.  in extendToUses()
186         isEarlyClobber = MI->getOperand(DefIdx).isEarlyClobber();  in extendToUses()
188       UseIdx = Indexes->getInstructionIndex(*MI).getRegSlot(isEarlyClobber);  in extendToUses()