@Test
public void shouldSimulateStoreWordWithoutHazard()
throws UnreachableLabelException, InvalidInstructionException {
Instruction first = new InstructionIType("sw $t0, 15($s1)");
Datapath datapath = new Datapath(Arrays.asList(first), new HashMap<String, Integer>());
rBank.setValue("t0", 7);
// First Stage
datapath.moveForward();
// Second Stage
datapath.moveForward();
assertEquals(new Integer(0), datapath.getIdEx().getReadData1());
assertEquals(new Integer(15), datapath.getIdEx().getReadData2());
// Third Stage
datapath.moveForward();
// o valor do registrador ser� registrado no endere�o 15 da mem�ria.
assertEquals(
15,
datapath
.getExMem()
.getALUOut()); // $s1 estava como zero, por isso a soma � 15 (que � a constante)
assertTrue(datapath.getExMem().isMemWrite());
assertFalse(datapath.getExMem().isMemRead());
assertFalse(datapath.getExMem().isRegWrite());
// Fourth Stage
datapath.moveForward();
assertEquals(7, memory.read(15)); // grava o valor do registrador na mem�ria
}
@Test
public void shouldProcessFirstStep()
throws UnreachableLabelException, InvalidInstructionException {
Instruction first = new InstructionIType("li $s0, 15");
Instruction second = new InstructionIType("li $s1, 25");
Instruction third = new InstructionRType("add $s2, $s1, $s0");
Instruction fourth = new InstructionIType("addi $s3, $s2, 15");
Datapath datapath =
new Datapath(Arrays.asList(first, second, third, fourth), new HashMap<String, Integer>());
datapath.moveForward();
assertEquals("li", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
datapath.moveForward();
assertEquals("li", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("li", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
datapath.moveForward();
assertEquals("add", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("li", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("li", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(15, datapath.getExMem().getALUOut());
datapath.moveForward();
assertEquals("addi", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("add", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("li", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("li", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(25, datapath.getExMem().getALUOut());
datapath.moveForward();
assertEquals("NOP", datapath.getIfId().getInstructionFetched().getOperation());
/*assertEquals("addi", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("add", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("li", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(25, datapath.getExMem().getALUOut());
assertEquals(15, rBank.getValue("s0")); //J� carregou o valor de 15 para o banco de registradores no quinto ciclo
assertEquals(0, rBank.getValue("s1")); //Mas, ainda n�o carregou o valor do s1...
*/
// datapath.moveForward();
}
@Test
public void shouldExecuteAddiOperation()
throws UnreachableLabelException, InvalidInstructionException {
Instruction first = new InstructionIType("addi $s0, $zero, 23");
Datapath datapath = new Datapath(Arrays.asList(first), new HashMap<String, Integer>());
datapath.moveForward();
assertEquals("addi", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
datapath.moveForward();
assertEquals("NOP", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("addi", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
datapath.moveForward();
assertEquals("NOP", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("addi", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(23, datapath.getExMem().getALUOut());
datapath.moveForward();
assertEquals("NOP", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("addi", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(0, rBank.getValue("s0"));
datapath.moveForward();
assertEquals("NOP", datapath.getIfId().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getIdEx().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getExMem().getInstructionFetched().getOperation());
assertEquals("NOP", datapath.getMemWb().getInstructionFetched().getOperation());
assertEquals(
23,
rBank.getValue("s0")); // S� modificou o valor no banco de registradores no quinto est�gio
}
@Test
public void shoudSimulateLoadWordWithoutHazard()
throws UnreachableLabelException, InvalidInstructionException {
Instruction first = new InstructionIType("lw $t0, 20($s1)");
Datapath datapath = new Datapath(Arrays.asList(first), new HashMap<String, Integer>());
memory.write(20, 15); // na posi��o 20 vou colocar o inteiro 15
// First stage
datapath.moveForward();
// Second Stage
datapath.moveForward();
// Load Word soma o valor do imeadiato com o valor do registrador
// Third Stage
datapath.moveForward();
assertEquals(
20,
datapath
.getExMem()
.getALUOut()); // $s0 estava como zero, por isso a soma � 20 que � a constante
assertTrue(datapath.getExMem().isMemToReg());
assertTrue(datapath.getExMem().isMemRead());
assertFalse(datapath.getExMem().isMemWrite());
assertEquals(0, rBank.getValue("t0")); // o t0 n�o foi inicializado
// Fourth Stage
datapath.moveForward();
assertEquals(15, datapath.getMemWb().getMemoryData());
// Fifth Stage
datapath.moveForward();
assertEquals(15, rBank.getValue("t0"));
}
@Test
public void shouldSimulateJump() throws InvalidInstructionException, UnreachableLabelException {
Instruction first = new InstructionJType("j LABEL");
Instruction second = new InstructionIType("addi $s1, $zero, 15");
Instruction third = new InstructionRType("add $s2, $zero, $s3");
Map<String, Integer> labels = new HashMap();
labels.put("LABEL", 3);
Datapath datapath = new Datapath(Arrays.asList(first, second, third), labels);
// First Cycle
// Stage 1 : Jump
// Stage 2: NOP
datapath.moveForward();
System.out.println(datapath.getIfId().getInstructionFetched().getOperation());
// Second Cycle
// Stage 1 : NOP
// Stage 2: Jump
datapath.moveForward();
System.out.println(datapath.getIfId().getInstructionFetched().getOperation());
// Third Stage
// Stage 1 : addi $s2
// Stage 2 : NOP
// Stage 3 : Jump
datapath.moveForward();
System.out.println(datapath.getIfId().getInstructionFetched().getOperation());
// Fourth Stage
datapath.moveForward();
System.out.println(datapath.getIfId().getInstructionFetched().getOperation());
// addi $s2, $zero, 20
}
/**
* Exemplo do slide passado em aula
*
* @throws InvalidInstructionException
* @throws UnreachableLabelException
*/
@Test
public void shouldSimulateLWHazard()
throws UnreachableLabelException, InvalidInstructionException {
Instruction first = new InstructionIType("lw $s2, 20($s1)");
Instruction second = new InstructionRType("and $s4, $s2, $s5");
Instruction third = new InstructionRType("or $s8, $s2, s6");
Instruction fourth = new InstructionRType("add $s7, $s4, $s2");
Datapath datapath =
new Datapath(Arrays.asList(first, second, third, fourth), new HashMap<String, Integer>());
datapath.moveForward();
fail(
"Terminar de implementar o teste que cause uma bolha no pipeline para esperar a instru��o lw");
}