static void replaceFrameIndexes(MachineFunction &MF, 
                                SmallVector<std::pair<int,int64_t>, 16> &FR) {
  MachineFrameInfo *MFI = MF.getFrameInfo();
  MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
  const SmallVector<std::pair<int,int64_t>, 16>::iterator FRB = FR.begin();
  const SmallVector<std::pair<int,int64_t>, 16>::iterator FRE = FR.end();

  SmallVector<std::pair<int,int64_t>, 16>::iterator FRI = FRB;
  for (; FRI != FRE; ++FRI) {
    MFI->RemoveStackObject(FRI->first);
    int NFI = MFI->CreateFixedObject(4, FRI->second, true);
    MBlazeFI->recordReplacement(FRI->first, NFI);

    for (MachineFunction::iterator MB=MF.begin(), ME=MF.end(); MB!=ME; ++MB) {
      MachineBasicBlock::iterator MBB = MB->begin();
      const MachineBasicBlock::iterator MBE = MB->end();

      for (; MBB != MBE; ++MBB) {
        MachineInstr::mop_iterator MIB = MBB->operands_begin();
        const MachineInstr::mop_iterator MIE = MBB->operands_end();

        for (MachineInstr::mop_iterator MII = MIB; MII != MIE; ++MII) {
          if (!MII->isFI() || MII->getIndex() != FRI->first) continue;
          DEBUG(dbgs() << "FOUND FI#" << MII->getIndex() << "\n");
          MII->setIndex(NFI);
        }
      }
    }
  }
}
Пример #2
0
/// addNewBlock - Add a new basic block BB as an empty succcessor to DomBB. All
/// variables that are live out of DomBB will be marked as passing live through
/// BB.
void LiveVariables::addNewBlock(MachineBasicBlock *BB,
                                MachineBasicBlock *DomBB,
                                MachineBasicBlock *SuccBB) {
  const unsigned NumNew = BB->getNumber();

  SmallSet<unsigned, 16> Defs, Kills;

  MachineBasicBlock::iterator BBI = SuccBB->begin(), BBE = SuccBB->end();
  for (; BBI != BBE && BBI->isPHI(); ++BBI) {
    // Record the def of the PHI node.
    Defs.insert(BBI->getOperand(0).getReg());

    // All registers used by PHI nodes in SuccBB must be live through BB.
    for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2)
      if (BBI->getOperand(i+1).getMBB() == BB)
        getVarInfo(BBI->getOperand(i).getReg()).AliveBlocks.set(NumNew);
  }

  // Record all vreg defs and kills of all instructions in SuccBB.
  for (; BBI != BBE; ++BBI) {
    for (MachineInstr::mop_iterator I = BBI->operands_begin(),
         E = BBI->operands_end(); I != E; ++I) {
      if (I->isReg() && TargetRegisterInfo::isVirtualRegister(I->getReg())) {
        if (I->isDef())
          Defs.insert(I->getReg());
        else if (I->isKill())
          Kills.insert(I->getReg());
      }
    }
  }

  // Update info for all live variables
  for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
    unsigned Reg = TargetRegisterInfo::index2VirtReg(i);

    // If the Defs is defined in the successor it can't be live in BB.
    if (Defs.count(Reg))
      continue;

    // If the register is either killed in or live through SuccBB it's also live
    // through BB.
    VarInfo &VI = getVarInfo(Reg);
    if (Kills.count(Reg) || VI.AliveBlocks.test(SuccBB->getNumber()))
      VI.AliveBlocks.set(NumNew);
  }
}