def _dec_value(processor, value):
processor.set_condition('p', value == 0x80)
result, half_carry, _ = bitwise_sub(value, 1)
processor.set_condition('s', to_signed(result) < 0)
processor.set_condition('z', result == 0)
processor.set_condition('h', half_carry)
processor.set_condition('n', True)
return result
def _dec_value(processor, value):
processor.set_condition('p', value == 0x80)
result, half_carry, _ = bitwise_sub(value, 1)
processor.set_condition('s', to_signed(result) < 0)
processor.set_condition('z', result == 0)
processor.set_condition('h', half_carry)
processor.set_condition('n', True)
return result
def _inc_value(processor, value):
processor.set_condition('p', value == 0x7f)
result, half_carry, _ = bitwise_add(value, 1)
processor.set_condition('s', to_signed(result) < 0)
processor.set_condition('z', result == 0)
processor.set_condition('h', half_carry)
processor.set_condition('n', False)
return result
def _inc_value(processor, value):
processor.set_condition('p', value == 0x7f)
result, half_carry, _ = bitwise_add(value, 1)
processor.set_condition('s', to_signed(result) < 0)
processor.set_condition('z', result == 0)
processor.set_condition('h', half_carry)
processor.set_condition('n', False)
return result