@pytest.fixture(scope="function", autouse=True)
    def check_fpu_mode(request):
        """
        Check FPU precision mode was not changed during the test.
        """
        old_mode = get_fpu_mode()
        yield
        new_mode = get_fpu_mode()
    
        if old_mode != new_mode:
>           raise AssertionError("FPU precision mode changed from {0:#x} to {1:#x}"
                                 " during the test".format(old_mode, new_mode))
E           AssertionError: FPU precision mode changed from 0x37f to 0x77f during the test

new_mode   = 1919
old_mode   = 895