def fst(t):
    assert (t.dtype == double_word_dtype)
    st = _shift_right_logical(t, const(double_word_dtype, nbits))
    return _bitcast_convert_type(_convert_element_type(st, new_dtype=word_dtype), dtype)
def fst(t):
    assert (t.dtype == double_word_dtype)
    st = _shift_right_logical(t, const(double_word_dtype, nbits))
    return _bitcast_convert_type(_convert_element_type(st, new_dtype=word_dtype), dtype)