I saw
q >> 3
q << 3
And figured it wasn't needed. But you're right, it's not quite the
same, but I would think that:
[...]
q' = q & ~3;
& ~7... :-)
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B