-
-// Check if this live virtual register interferes with a physical register. If
-// not, then check for interference on each register that aliases with the
-// physical register. Return the interfering register.
-unsigned RegAllocBase::checkPhysRegInterference(LiveInterval &VirtReg,
- unsigned PhysReg) {
- for (MCRegAliasIterator AI(PhysReg, TRI, true); AI.isValid(); ++AI)
- if (query(VirtReg, *AI).checkInterference())
- return *AI;
- return 0;
-}
-
-// Add newly allocated physical registers to the MBB live in sets.
-void RegAllocBase::addMBBLiveIns(MachineFunction *MF) {
- NamedRegionTimer T("MBB Live Ins", TimerGroupName, TimePassesIsEnabled);
- SlotIndexes *Indexes = LIS->getSlotIndexes();
- if (MF->size() <= 1)
- return;
-
- LiveIntervalUnion::SegmentIter SI;
- for (unsigned PhysReg = 0; PhysReg < PhysReg2LiveUnion.numRegs(); ++PhysReg) {
- LiveIntervalUnion &LiveUnion = PhysReg2LiveUnion[PhysReg];
- if (LiveUnion.empty())
- continue;
- DEBUG(dbgs() << PrintReg(PhysReg, TRI) << " live-in:");
- MachineFunction::iterator MBB = llvm::next(MF->begin());
- MachineFunction::iterator MFE = MF->end();
- SlotIndex Start, Stop;
- tie(Start, Stop) = Indexes->getMBBRange(MBB);
- SI.setMap(LiveUnion.getMap());
- SI.find(Start);
- while (SI.valid()) {
- if (SI.start() <= Start) {
- if (!MBB->isLiveIn(PhysReg))
- MBB->addLiveIn(PhysReg);
- DEBUG(dbgs() << "\tBB#" << MBB->getNumber() << ':'
- << PrintReg(SI.value()->reg, TRI));
- } else if (SI.start() > Stop)
- MBB = Indexes->getMBBFromIndex(SI.start().getPrevIndex());
- if (++MBB == MFE)
- break;
- tie(Start, Stop) = Indexes->getMBBRange(MBB);
- SI.advanceTo(Start);
- }
- DEBUG(dbgs() << '\n');
- }
-}
-