C++ iterator::isRegTiedToUseOperand方法代码示例

/// ComputeLocalLiveness - Computes liveness of registers within a basic
/// block, setting the killed/dead flags as appropriate.
void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
  MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
  // Keep track of the most recently seen previous use or def of each reg, 
  // so that we can update them with dead/kill markers.
  DenseMap<unsigned, std::pair<MachineInstr*, unsigned> > LastUseDef;
  for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
       I != E; ++I) {
    if (I->isDebugValue())
      continue;
    
    for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
      MachineOperand &MO = I->getOperand(i);
      // Uses don't trigger any flags, but we need to save
      // them for later.  Also, we have to process these
      // _before_ processing the defs, since an instr
      // uses regs before it defs them.
      if (!MO.isReg() || !MO.getReg() || !MO.isUse())
        continue;
      
      LastUseDef[MO.getReg()] = std::make_pair(I, i);
      
      if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) continue;
      
      const unsigned *Aliases = TRI->getAliasSet(MO.getReg());
      if (Aliases == 0)
        continue;
      
      while (*Aliases) {
        DenseMap<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
          alias = LastUseDef.find(*Aliases);
        
        if (alias != LastUseDef.end() && alias->second.first != I)
          LastUseDef[*Aliases] = std::make_pair(I, i);
        
        ++Aliases;
      }
    }
    
    for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
      MachineOperand &MO = I->getOperand(i);
      // Defs others than 2-addr redefs _do_ trigger flag changes:
      //   - A def followed by a def is dead
      //   - A use followed by a def is a kill
      if (!MO.isReg() || !MO.getReg() || !MO.isDef()) continue;
      
      DenseMap<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
        last = LastUseDef.find(MO.getReg());
      if (last != LastUseDef.end()) {
        // Check if this is a two address instruction.  If so, then
        // the def does not kill the use.
        if (last->second.first == I &&
            I->isRegTiedToUseOperand(i))
          continue;
        
        MachineOperand &lastUD =
                    last->second.first->getOperand(last->second.second);
        if (lastUD.isDef())
          lastUD.setIsDead(true);
        else
          lastUD.setIsKill(true);
      }
      
      LastUseDef[MO.getReg()] = std::make_pair(I, i);
    }
  }
  
  // Live-out (of the function) registers contain return values of the function,
  // so we need to make sure they are alive at return time.
  MachineBasicBlock::iterator Ret = MBB.getFirstTerminator();
  bool BBEndsInReturn = (Ret != MBB.end() && Ret->getDesc().isReturn());

  if (BBEndsInReturn)
    for (MachineRegisterInfo::liveout_iterator
         I = MF->getRegInfo().liveout_begin(),
         E = MF->getRegInfo().liveout_end(); I != E; ++I)
      if (!Ret->readsRegister(*I)) {
        Ret->addOperand(MachineOperand::CreateReg(*I, false, true));
        LastUseDef[*I] = std::make_pair(Ret, Ret->getNumOperands()-1);
      }
  
  // Finally, loop over the final use/def of each reg 
  // in the block and determine if it is dead.
  for (DenseMap<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
       I = LastUseDef.begin(), E = LastUseDef.end(); I != E; ++I) {
    MachineInstr *MI = I->second.first;
    unsigned idx = I->second.second;
    MachineOperand &MO = MI->getOperand(idx);
    
    bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(MO.getReg());
    
    // A crude approximation of "live-out" calculation
    bool usedOutsideBlock = isPhysReg ? false :   
          UsedInMultipleBlocks.test(MO.getReg() -  
                                    TargetRegisterInfo::FirstVirtualRegister);

    // If the machine BB ends in a return instruction, then the value isn't used
    // outside of the BB.
    if (!isPhysReg && (!usedOutsideBlock || BBEndsInReturn)) {
//.........这里部分代码省略.........

/// PropagateBackward - Traverse backward and look for the definition of
/// OldReg. If it can successfully update all of the references with NewReg,
/// do so and return true.
bool StackSlotColoring::PropagateBackward(MachineBasicBlock::iterator MII,
                                          MachineBasicBlock *MBB,
                                          unsigned OldReg, unsigned NewReg) {
  if (MII == MBB->begin())
    return false;

  SmallVector<MachineOperand*, 4> Uses;
  SmallVector<MachineOperand*, 4> Refs;
  while (--MII != MBB->begin()) {
    bool FoundDef = false;  // Not counting 2address def.

    Uses.clear();
    const TargetInstrDesc &TID = MII->getDesc();
    for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
      MachineOperand &MO = MII->getOperand(i);
      if (!MO.isReg())
        continue;
      unsigned Reg = MO.getReg();
      if (Reg == 0)
        continue;
      if (Reg == OldReg) {
        if (MO.isImplicit())
          return false;

        // Abort the use is actually a sub-register def. We don't have enough
        // information to figure out if it is really legal.
        if (MO.getSubReg() || MII->isSubregToReg())
          return false;

        const TargetRegisterClass *RC = TID.OpInfo[i].getRegClass(TRI);
        if (RC && !RC->contains(NewReg))
          return false;

        if (MO.isUse()) {
          Uses.push_back(&MO);
        } else {
          Refs.push_back(&MO);
          if (!MII->isRegTiedToUseOperand(i))
            FoundDef = true;
        }
      } else if (TRI->regsOverlap(Reg, NewReg)) {
        return false;
      } else if (TRI->regsOverlap(Reg, OldReg)) {
        if (!MO.isUse() || !MO.isKill())
          return false;
      }
    }

    if (FoundDef) {
      // Found non-two-address def. Stop here.
      for (unsigned i = 0, e = Refs.size(); i != e; ++i)
        Refs[i]->setReg(NewReg);
      return true;
    }

    // Two-address uses must be updated as well.
    for (unsigned i = 0, e = Uses.size(); i != e; ++i)
      Refs.push_back(Uses[i]);
  }
  return false;
}