public void TestAdd()
{
var cpu = new CPU();
//Set initial values in register file
cpu.RegWrite(2, 10);
cpu.RegWrite(3, 255);
const string instr = "add $1, $2, $3";
cpu.AddInstruction(new Add(instr, 0, 1, 2, 3));
var expectedRecords = new List<ExecutionRecordList>();
int clockCycle = 0;
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, instr, 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "Add: rd = $1, rs = $2, rt = $3", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "Add 10 + 255 = 265", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Memory, "None", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Writeback, "Register $1 <= 265", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Test value inside register file
Assert.AreEqual(265, cpu.RegRead(1));
Assert.AreEqual(clockCycle, cpu.ClockCycle);
}
public void TestAddi()
{
var cpu = new CPU();
//Set initial values in register file
cpu.RegWrite(1, 123456);
const string instr = "addi $2, $1, 123456";
cpu.AddInstruction(new Addi(instr, 0, 2, 1, 123456));
var expectedRecords = new List<ExecutionRecordList>();
int clockCycle = 0;
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, instr, 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "Addi: rt = $2, rs = $1, imm = 123456", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "Add 123456 + 123456 = 246912", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Memory, "None", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Writeback, "Register $2 <= 246912", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Test value inside register file
Assert.AreEqual(246912, cpu.RegRead(2));
Assert.AreEqual(clockCycle, cpu.ClockCycle);
}
public void TestXor()
{
var cpu = new CPU();
//Set initial values in register file
cpu.RegWrite(2, 1565861035);
cpu.RegWrite(3, 882150058);
const string instr = "xor $1, $2, $3";
cpu.AddInstruction(new Xor(instr, 0, 1, 2, 3));
var expectedRecords = new List<ExecutionRecordList>();
int clockCycle = 0;
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, instr, 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "Xor: rd = $1, rs = $2, rt = $3", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "Xor 1565861035 ^ 882150058 = 1774300673", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Memory, "None", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Writeback, "Register $1 <= 1774300673", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Test value inside register file
Assert.AreEqual(1774300673, cpu.RegRead(1));
Assert.AreEqual(clockCycle, cpu.ClockCycle);
}
public void TestLW()
{
var cpu = new CPU();
cpu.Store(5 << 2, 123456789);
cpu.RegWrite(6, 4 << 2);
const string instr = "lw $5, 4($6)";
var instructionAdd = new LW(instr, 0, 5, 4, 6);
cpu.AddInstruction(instructionAdd);
var expectedRecords = new List<ExecutionRecordList>();
int clockCycle = 0;
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, instr, 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "LW: rs = $6, rt = $5, imm = 4", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "LW Address = 16 + 4 = 20", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Memory, "Memory access result = 123456789", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Writeback, "Register $5 <= 123456789", 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Test value inside register file
Assert.AreEqual(123456789, cpu.RegRead(5));
Assert.AreEqual(clockCycle, cpu.ClockCycle);
}
public void TestJal()
{
var cpu = new CPU();
const string instr = "jal 4";
cpu.AddInstruction(new Jal(instr, 0, 4));
cpu.AddInstruction(new Nop("nop", 0));
cpu.AddInstruction(new Nop("nop", 0));
cpu.AddInstruction(new Nop("nop", 0));
cpu.AddInstruction(new Nop("nop", 1)); //Should jump to this instruction
var expectedRecords = new List<ExecutionRecordList>();
int clockCycle = 0;
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, instr, 0, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "Jal: imm = 4", 0, null));
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, "nop", 1, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Jump should have been taken
Assert.AreEqual(4 << 2, cpu.GetPC());
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "None", 0, null));
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Fetch, "nop", 2, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Memory, "None", 0, null));
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Decode, "Nop: ", 2, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
cpu.RunClock();
expectedRecords.Add(new ExecutionRecordList());
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Writeback, "Register $15 <= 4", 0, null));
expectedRecords[clockCycle].Add(new ExecutionRecord(ExecutionType.Execute, "", 2, null));
clockCycle++;
Assert.IsTrue(expectedRecords.SequenceEqual(cpu.ExecutionRecords));
//Test value inside register file
Assert.AreEqual(1 << 2, cpu.RegRead(15));
Assert.AreEqual(clockCycle, cpu.ClockCycle);
}