Ejemplos de instr_iterator::isKill en C++ (Cpp)

Ejemplo n.º 1

Archivo: LanaiDelaySlotFiller.cpp Proyecto: bharadwajy/checkedc-llvm

bool Filler::delayHasHazard(MachineBasicBlock::instr_iterator MI, bool &SawLoad,
                            bool &SawStore, SmallSet<unsigned, 32> &RegDefs,
                            SmallSet<unsigned, 32> &RegUses) {
  if (MI->isImplicitDef() || MI->isKill())
    return true;

  // Loads or stores cannot be moved past a store to the delay slot
  // and stores cannot be moved past a load.
  if (MI->mayLoad()) {
    if (SawStore)
      return true;
    SawLoad = true;
  }

  if (MI->mayStore()) {
    if (SawStore)
      return true;
    SawStore = true;
    if (SawLoad)
      return true;
  }

  assert((!MI->isCall() && !MI->isReturn()) &&
         "Cannot put calls or returns in delay slot.");

  for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
    const MachineOperand &MO = MI->getOperand(I);
    unsigned Reg;

    if (!MO.isReg() || !(Reg = MO.getReg()))
      continue; // skip

    if (MO.isDef()) {
      // check whether Reg is defined or used before delay slot.
      if (isRegInSet(RegDefs, Reg) || isRegInSet(RegUses, Reg))
        return true;
    }
    if (MO.isUse()) {
      // check whether Reg is defined before delay slot.
      if (isRegInSet(RegDefs, Reg))
        return true;
    }
  }
  return false;
}