public static IntNum shift(IntNum x, int count)
{
if (x.words == null)
{
if (count <= 0)
return make (count > -32 ? x.ival >> (-count) : x.ival < 0 ? -1 : 0);
if (count < 32)
return make ((long) x.ival << count);
}
if (count == 0)
return x;
IntNum result = new IntNum (0);
result.setShift (x, count);
return result.canonicalize ();
}