wherein the A, B, C and D register values at the beginning of the time critical path are An, Bn, Cn, Dn, and further wherein the A, B, C and D register values at {HEAD ~ the end} of {TAIL ~ the time critical path} are An+4, Bn+4, Cn+4, Dn+4 
of
wherein the A , B , C and D register values at the beginning of the time critical path are An , Bn , Cn , Dn , and further wherein the A , B , C and D register values at { HEAD ~ the end } of { TAIL ~ the time critical path } are An+4 , Bn+4 , Cn+4 , Dn+4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH