C++ iterator::getInstrIterator方法代码示例

MachineBasicBlock::iterator
MachineBasicBlock::erase(MachineBasicBlock::iterator I) {
  if (I->isBundle()) {
    MachineBasicBlock::iterator E = llvm::next(I);
    return Insts.erase(I.getInstrIterator(), E.getInstrIterator());
  }

  return Insts.erase(I.getInstrIterator());
}

void MachineBasicBlock::splice(MachineBasicBlock::iterator where,
                               MachineBasicBlock *Other,
                               MachineBasicBlock::iterator From) {
  if (From->isBundle()) {
    MachineBasicBlock::iterator To = llvm::next(From);
    Insts.splice(where.getInstrIterator(), Other->Insts,
                 From.getInstrIterator(), To.getInstrIterator());
    return;
  }

  Insts.splice(where.getInstrIterator(), Other->Insts, From.getInstrIterator());
}

// End the current packet, bundle packet instructions and reset DFA state.
void VLIWPacketizerList::endPacket(MachineBasicBlock *MBB,
                                   MachineBasicBlock::iterator MI) {
  if (CurrentPacketMIs.size() > 1) {
    MachineInstr &MIFirst = *CurrentPacketMIs.front();
    finalizeBundle(*MBB, MIFirst.getIterator(), MI.getInstrIterator());
  }
  CurrentPacketMIs.clear();
  ResourceTracker->clearResources();
}

 ClauseFile
 MakeALUClause(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I)
     const {
   MachineBasicBlock::iterator ClauseHead = I;
   std::vector<MachineInstr *> ClauseContent;
   I++;
   for (MachineBasicBlock::instr_iterator E = MBB.instr_end(); I != E;) {
     if (IsTrivialInst(I)) {
       ++I;
       continue;
     }
     if (!I->isBundle() && !TII->isALUInstr(I->getOpcode()))
       break;
     std::vector<int64_t> Literals;
     if (I->isBundle()) {
       MachineInstr *DeleteMI = I;
       MachineBasicBlock::instr_iterator BI = I.getInstrIterator();
       while (++BI != E && BI->isBundledWithPred()) {
         BI->unbundleFromPred();
         for (unsigned i = 0, e = BI->getNumOperands(); i != e; ++i) {
           MachineOperand &MO = BI->getOperand(i);
           if (MO.isReg() && MO.isInternalRead())
             MO.setIsInternalRead(false);
         }
         getLiteral(BI, Literals);
         ClauseContent.push_back(BI);
       }
       I = BI;
       DeleteMI->eraseFromParent();
     } else {
       getLiteral(I, Literals);
       ClauseContent.push_back(I);
       I++;
     }
     for (unsigned i = 0, e = Literals.size(); i < e; i+=2) {
       unsigned literal0 = Literals[i];
       unsigned literal2 = (i + 1 < e)?Literals[i + 1]:0;
       MachineInstr *MILit = BuildMI(MBB, I, I->getDebugLoc(),
           TII->get(AMDGPU::LITERALS))
           .addImm(literal0)
           .addImm(literal2);
       ClauseContent.push_back(MILit);
     }
   }
   ClauseHead->getOperand(7).setImm(ClauseContent.size() - 1);
   return ClauseFile(ClauseHead, ClauseContent);
 }

bool Thumb2ITBlockPass::InsertITInstructions(MachineBasicBlock &MBB) {
  bool Modified = false;

  SmallSet<unsigned, 4> Defs;
  SmallSet<unsigned, 4> Uses;
  MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();
  while (MBBI != E) {
    MachineInstr *MI = &*MBBI;
    DebugLoc dl = MI->getDebugLoc();
    unsigned PredReg = 0;
    ARMCC::CondCodes CC = llvm::getITInstrPredicate(MI, PredReg);
    if (CC == ARMCC::AL) {
      ++MBBI;
      continue;
    }

    Defs.clear();
    Uses.clear();
    TrackDefUses(MI, Defs, Uses, TRI);

    // Insert an IT instruction.
    MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII->get(ARM::t2IT))
      .addImm(CC);

    // Add implicit use of ITSTATE to IT block instructions.
    MI->addOperand(MachineOperand::CreateReg(ARM::ITSTATE, false/*ifDef*/,
                                             true/*isImp*/, false/*isKill*/));

    MachineInstr *LastITMI = MI;
    MachineBasicBlock::iterator InsertPos = MIB;
    ++MBBI;

    // Form IT block.
    ARMCC::CondCodes OCC = ARMCC::getOppositeCondition(CC);
    unsigned Mask = 0, Pos = 3;
    // Branches, including tricky ones like LDM_RET, need to end an IT
    // block so check the instruction we just put in the block.
    for (; MBBI != E && Pos &&
           (!MI->isBranch() && !MI->isReturn()) ; ++MBBI) {
      if (MBBI->isDebugValue())
        continue;

      MachineInstr *NMI = &*MBBI;
      MI = NMI;

      unsigned NPredReg = 0;
      ARMCC::CondCodes NCC = llvm::getITInstrPredicate(NMI, NPredReg);
      if (NCC == CC || NCC == OCC) {
        Mask |= (NCC & 1) << Pos;
        // Add implicit use of ITSTATE.
        NMI->addOperand(MachineOperand::CreateReg(ARM::ITSTATE, false/*ifDef*/,
                                               true/*isImp*/, false/*isKill*/));
        LastITMI = NMI;
      } else {
        if (NCC == ARMCC::AL &&
            MoveCopyOutOfITBlock(NMI, CC, OCC, Defs, Uses)) {
          --MBBI;
          MBB.remove(NMI);
          MBB.insert(InsertPos, NMI);
          ++NumMovedInsts;
          continue;
        }
        break;
      }
      TrackDefUses(NMI, Defs, Uses, TRI);
      --Pos;
    }

    // Finalize IT mask.
    Mask |= (1 << Pos);
    // Tag along (firstcond[0] << 4) with the mask.
    Mask |= (CC & 1) << 4;
    MIB.addImm(Mask);

    // Last instruction in IT block kills ITSTATE.
    LastITMI->findRegisterUseOperand(ARM::ITSTATE)->setIsKill();

    // Finalize the bundle.
    MachineBasicBlock::instr_iterator LI = LastITMI;
    finalizeBundle(MBB, InsertPos.getInstrIterator(), llvm::next(LI));

    Modified = true;
    ++NumITs;
  }

  return Modified;
}