public int[] GetPipelineValues()
{
int[] pipelineValues = new int[30];
int currentAddress = (currentIndex * 4) + startAddress;
pipelineValues[0] = currentIndex != -1 ? currentAddress + 4 : pcReg;
pipelineValues[1] = currentIndex != -1 ? currentAddress + 8 : pcReg + 4;
if (branchGUI)
{
pipelineValues[0] -= 4;
pipelineValues[1] -= 4;
branchGUI = false;
}
if (IFID != "0")
{
String[] instruction = IFID.Split(' ');
pipelineValues[2] = int.Parse(instruction[7]); // RS
pipelineValues[3] = int.Parse(instruction[3]); // RT
pipelineValues[4] = int.Parse(instruction[1]); // Read data 1
pipelineValues[5] = int.Parse(instruction[2]); // Read data 2
pipelineValues[6] = instruction[0] == "0" ? int.Parse(instruction[4]) : -1; // Write Register
pipelineValues[7] = instruction[0] == "0" ? mipsRegisters[int.Parse(instruction[4])] : -1; // Write Data
pipelineValues[8] = instruction[0] == "0" ? -1 : int.Parse(instruction[4]); // Immediate
pipelineValues[9] = instruction[0] == "0" ? int.Parse(instruction[3]) : -1; // RT
pipelineValues[10] = instruction[0] == "0" ? int.Parse(instruction[4]) : -1; // RD
}
else
{
pipelineValues[2] = -1;
pipelineValues[3] = -1;
pipelineValues[4] = -1;
pipelineValues[5] = -1;
pipelineValues[6] = -1;
pipelineValues[7] = -1;
pipelineValues[8] = -1;
pipelineValues[9] = -1;
pipelineValues[10] = -1;
}
if (IDEX != "0")
{
String[] instruction = IDEX.Split(' ');
pipelineValues[11] = pipelineValues[4]; // RS
pipelineValues[12] = pipelineValues[5]; // RT
pipelineValues[13] = pipelineValues[8]; // RT
pipelineValues[14] = instruction[0] == "0" ? pipelineValues[12] : pipelineValues[13]; // Mux Value // RT
pipelineValues[15] = int.Parse(instruction[1]); // ALU value
pipelineValues[16] = pipelineValues[9]; // RT
pipelineValues[17] = pipelineValues[10]; // RD
pipelineValues[18] = instruction[0] == "0" ? pipelineValues[16] : -1; // RT
pipelineValues[19] = pcReg - 4; // PC Reg
pipelineValues[20] = instruction[0] == "0" ? -1 : int.Parse(instruction[4]); // Adder value
}
else
{
pipelineValues[11] = -1;
pipelineValues[12] = -1;
pipelineValues[13] = -1;
pipelineValues[14] = -1;
pipelineValues[15] = -1;
pipelineValues[16] = -1;
pipelineValues[17] = -1;
pipelineValues[18] = -1;
pipelineValues[19] = -1;
pipelineValues[20] = -1;
}
if (EXMEM != "0")
{
String[] instruction = EXMEM.Split(' ');
pipelineValues[21] = pipelineValues[20]; // Adder Value
pipelineValues[22] = pipelineValues[15]; // ALU Value
pipelineValues[23] = pipelineValues[12]; // Read Data 2
pipelineValues[24] = pipelineValues[23]; // Read Data 2
pipelineValues[25] = pipelineValues[18]; // Mux Value
}
else
{
pipelineValues[21] = -1;
pipelineValues[22] = -1;
pipelineValues[23] = -1;
pipelineValues[24] = -1;
pipelineValues[25] = -1;
}
if (MEMWB != "0")
{
String[] instruction = MEMWB.Split(' ');
pipelineValues[26] = pipelineValues[24]; // Read Data 2
pipelineValues[27] = pipelineValues[22]; // ALU Value
pipelineValues[28] = instruction[0] == "0" ? pipelineValues[27] : -1; // ALU Value
pipelineValues[29] = pipelineValues[25]; // RD
}
else
{
pipelineValues[26] = -1;
pipelineValues[27] = -1;
pipelineValues[28] = -1;
pipelineValues[29] = -1;
}
return(pipelineValues);
}
public void Decode()
{
if (IDEX == "0")
{
return;
}
String[] instruction = IDEX.Split(' ');
char op = instruction[0] == "0" ? 'r' : 'i';
ControlUnit(op);
int val1 = int.Parse(instruction[2]);
int val2 = int.Parse(instruction[4]);
int muxValue = Mux2x1(val1, val2, aluSrc);
String operation;
switch (instruction[6])
{
case "32":
operation = "add";
break;
case "34":
operation = "sub";
break;
case "36":
operation = "and";
break;
case "37":
operation = "or";
break;
default:
operation = "add";
break;
}
operation = op != 'r' ? "beq" : operation;
int aluValue = ALU(int.Parse(instruction[1]), muxValue, operation);
val1 = int.Parse(instruction[3]);
val2 = int.Parse(instruction[4]);
muxValue = Mux2x1(val1, val2, regDst);
IDEX = instruction[0].ToString() + " " // 0 - Op Code
+ aluValue.ToString() + " " // 1 - ALU Result
+ instruction[2].ToString() + " " // 2 - Read Data 2
+ muxValue.ToString() + " "; // 3 - Mux Result
int addValue;
if (operation == "beq")
{
val1 = int.Parse(instruction[4]) * 4;
val2 = int.Parse(instruction[5]);
addValue = Adder(val1, val2);
IDEX += addValue.ToString(); // 4 - Adder Value
}
}