if (known_eq (bitregion_end, 0U))
{
bitregion_start = round_down_to_byte_boundary (bitpos);
bitregion_end = round_up_to_byte_boundary (bitpos + bitsize);
bitregion_end = bitpos;
bitregion_end = round_up_to_byte_boundary (bitregion_end + bitsize);
}
if (offset != NULL_TREE)