AsmResolver.Net.Msil.MethodBody.TryOptimizeArgument C# (CSharp) Method

        private void TryOptimizeArgument(MsilInstruction instruction)
        {
            var parameter = instruction.Operand as ParameterSignature;
            if (Method == null || Method.Signature == null || parameter == null)
                return;
            int index = Method.Signature.Parameters.IndexOf(parameter);
            if (index < 0 || index > byte.MaxValue)
                return;

            switch (instruction.OpCode.Code)
            {
                case MsilCode.Ldarg:
                    if (index <= 3)
                    {
                        instruction.OpCode = MsilOpCodes.SingleByteOpCodes[MsilOpCodes.Ldarg_0.Op2 + index];
                        instruction.Operand = null;
                    }
                    else
                    {
                        instruction.OpCode = MsilOpCodes.Ldarg_S;
                    }
                    break;
                case MsilCode.Ldarga:
                    instruction.OpCode = MsilOpCodes.Ldarga_S;
                    break;
            }
        }