void foo(void)
{
    while (nextSegmentIndex >= 0)
    {
        Segment seg = map.segments[nextSegmentIndex--];
        volatile if (seg.count)
            {
                currentTable = seg.table;
                for (int j = currentTable.length - 1; j >= 0; --j)
                {
                    if ((nextEntry = currentTable[j]) !is null)
                    {
                        nextTableIndex = j - 1;
                        return;
                    }
                }
            }
    }

    if (e)
        volatile
        {
            oldValue = e.value;
            e.value  = newValue;
        }
    return oldValue;
}