private string BuildBytes(MachineInstruction instr)
 {
     var sb = new StringBuilder();
     var rdr = program.CreateImageReader(instr.Address);
     for (int i = 0; i < instr.Length; ++i)
     {
         sb.AppendFormat("{0:X2} ", rdr.ReadByte());
     }
     return sb.ToString();
 }

 public C_seq_d(MachineInstruction machineInstruction)
     : base("c_seq_d", machineInstruction)
 {
 }

 public Xor(MachineInstruction machineInstruction)
     : base("xor", machineInstruction, Flag.IntegerComputation, FunctionalUnit.Types.IntALU)
 {
 }

 public Unimplemented(string mnemonic, MachineInstruction machineInstruction)
     : base(mnemonic, machineInstruction, Flag.None, FunctionalUnit.Types.None)
 {
 }

 public Swr(MachineInstruction machineInstruction)
     : base("swr", machineInstruction, Flag.Memory | Flag.Store | Flag.DisplacedAddressing, FunctionalUnit.Types.WritePort)
 {
 }

 public Subu(MachineInstruction machineInstruction)
     : base("subu", machineInstruction, Flag.IntegerComputation, FunctionalUnit.Types.IntALU)
 {
 }

 public Nop(MachineInstruction machineInstruction)
     : base("nop", machineInstruction, Flag.None, FunctionalUnit.Types.None)
 {
 }

 public Mul_s(MachineInstruction machineInstruction)
     : base("mul_s", machineInstruction, Flag.FloatComputation, FunctionalUnit.Types.FloatMultiply)
 {
 }

        public IntImmOp(string mnemonic, MachineInstruction machineInstruction, Flag flags, FunctionalUnit.Types fuType)
            : base(mnemonic, machineInstruction, flags, fuType)
        {
            this.Imm = (short)machineInstruction[BitField.INTIMM];

            this.ZextImm = 0x0000FFFF & machineInstruction[BitField.INTIMM];

            this.SextImm = BitHelper.Sext (machineInstruction[BitField.INTIMM], 16);
        }

 public FloatConvertOp(string mnemonic, MachineInstruction machineInstruction)
     : base(mnemonic, machineInstruction, Flag.FloatComputation, FunctionalUnit.Types.FloatConvert)
 {
 }

 public FailUnimplemented(string mnemonic, MachineInstruction machineInstruction)
     : base(mnemonic, machineInstruction)
 {
 }

 public Div_s(MachineInstruction machineInstruction)
     : base("div_s", machineInstruction, Flag.FloatComputation, FunctionalUnit.Types.FloatDivide)
 {
 }

 public Divu(MachineInstruction machineInstruction)
     : base("divu", machineInstruction, Flag.IntegerComputation, FunctionalUnit.Types.IntDivide)
 {
 }

 public C_un_s(MachineInstruction machineInstruction)
     : base("c_un_s", machineInstruction)
 {
 }

 public C_ult_d(MachineInstruction machineInstruction)
     : base("c_ult_d", machineInstruction)
 {
 }

 public Mtc1(MachineInstruction machineInstruction)
     : base("mtc1", machineInstruction, Flag.None, FunctionalUnit.Types.None)
 {
 }

 public Mult(MachineInstruction machineInstruction)
     : base("mult", machineInstruction, Flag.IntegerComputation, FunctionalUnit.Types.IntALU)
 {
 }

 public IntOp(string mnemonic, MachineInstruction machineInstruction, Flag flags, FunctionalUnit.Types fuType)
     : base(mnemonic, machineInstruction, flags, fuType)
 {
 }

 public Neg_s(MachineInstruction machineInstruction)
     : base("neg_s", machineInstruction, Flag.FloatComputation, FunctionalUnit.Types.FloatCompare)
 {
 }

 public Jalr(MachineInstruction machineInstruction)
     : base("jalr", machineInstruction, Flag.Control | Flag.UnconditionalBranch | Flag.FunctionCall | Flag.IndirectJump, FunctionalUnit.Types.IntALU)
 {
 }