def test_multiplication_8(a, b):
"""Multiplication of two eight-bit integers should work"""
Emulator.reset()
RAM[vars.a] = a
RAM[vars.b] = b
Emulator.next_instruction = "multiply 8x8"
expected_saving = (vars.no_msb_cost_saving if a < 128 and b < 128 else
vars.one_msb_cost_saving if a < 128 or b < 128 else 0)
cycles = Emulator.run_to("done")
result = int.from_bytes(RAM[vars.result:vars.result + 2],
"little",
signed=False)
assert a * b == result
assert vars.cost_of_8bit_multiply - expected_saving == cycles
def setup_function():
Emulator.reset()
