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

        private void TryOptimizeVariable(MsilInstruction instruction)
        {
            var variable = instruction.Operand as VariableSignature;
            var localVarSig = Signature != null ? Signature.Signature as LocalVariableSignature : null;
            if (localVarSig == null || variable == null)
                return;
            int index = localVarSig.Variables.IndexOf(variable);
            if (index < 0 || index > byte.MaxValue)
                return;

            switch (instruction.OpCode.Code)
            {
                case MsilCode.Ldloc:
                    if (index <= 3)
                    {
                        instruction.OpCode = MsilOpCodes.SingleByteOpCodes[MsilOpCodes.Ldloc_0.Op2 + index];
                        instruction.Operand = null;
                    }
                    else
                    {
                        instruction.OpCode = MsilOpCodes.Ldloc_S;
                    }
                    break;
                case MsilCode.Ldloca:
                    instruction.OpCode = MsilOpCodes.Ldloca_S;
                    break;
                case MsilCode.Stloc:
                    if (index <= 3)
                    {
                        instruction.OpCode = MsilOpCodes.SingleByteOpCodes[MsilOpCodes.Stloc_0.Op2 + index];
                        instruction.Operand = null;
                    }
                    else
                    {
                        instruction.OpCode = MsilOpCodes.Stloc_S;
                    }
                    break;
            }
        }