class TestMipsPipelineSteps(unittest.TestCase):
def setUp(self):
self.mips = Mips()
self.add = Instruction('00000000001001110100100000100000 ; I1: add R9,R1,R7')
self.addi = Instruction('00100000000010100000000001100100 ; I2: addi R10,R0,100')
def test_an_intermediary_step(self):
self.add.instruction_decode(self.mips)
self.add.execute(self.mips)
self.addi.instruction_decode(self.mips)
self.mips.pipeline[2].instruction = self.addi
self.mips.pipeline[3].instruction = self.add
self.mips.execute_pipeline()
self.assertEqual(self.mips.pipeline[2].instruction, self.addi)
self.assertTrue(self.mips.pipeline[2].done)
self.assertEqual(self.mips.pipeline[3].instruction, self.add)
self.assertTrue(self.mips.pipeline[3].done)
class TestMulInstruction(BaseTestInstruction, unittest.TestCase):
def setUp(self):
self.text = "00000000001001110100100000011000 ; I4: mul R9,R1,R7"
self.instruction = Instruction(self.text)
registers = Registers()
registers[1] = 3
registers[7] = 2
registers[9] = 4
self._mips = MipsStub(registers, memory=[])
def test_instruction_decode(self):
BaseTestInstruction.instruction_decode(self)
self.assertEqual(self.instruction.rs_value, 3)
self.assertEqual(self.instruction.rt_value, 2)
def test_execute(self):
BaseTestInstruction.execute(self)
self.assertEqual(self.instruction.rd_value, 6)
self.assertEqual(self._mips.registers[1], 3)
self.assertEqual(self._mips.registers[7], 2)
def test_execute_with_data_forward(self):
self._mips.data_forwarding = True
BaseTestInstruction.execute(self)
self.assertEqual(self._mips.registers[9], 6)
def test_memory_access(self):
BaseTestInstruction.memory_access(self)
def test_write_back(self):
BaseTestInstruction.write_back(self)
self.assertEqual(self._mips.registers[1], 3)
self.assertEqual(self._mips.registers[7], 2)
self.assertEqual(self._mips.registers[9], 6)
def test_all_true_returns(self):
self.assertTrue(self.instruction.instruction_decode(self._mips))
self.assertFalse(self.instruction.execute(self._mips))
self.assertTrue(self.instruction.execute(self._mips))
self.assertTrue(self.instruction.memory_access(self._mips))
self.assertTrue(self.instruction.write_back(self._mips))
def test_register_lock(self):
BaseTestInstruction.instruction_decode(self)
self.assertRaises(RegisterInUseException, self._mips.registers.__getitem__, 9)
def test_register_unlock(self):
BaseTestInstruction.write_back(self)
self._mips.registers[9]
