{HEAD ~ The mask} generated from {TAIL ~ the most significant bits section} of the pointer includes bits corresponding to various regions of the output mask 
generated from
{ HEAD ~ The mask } generated from { TAIL ~ the most significant bits section } of the pointer includes bits corresponding to various regions of the output mask
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH