Vector adder 80 performs {HEAD ~ integer and floating point add or subtract operations} on {TAIL ~ two 64 bit words} supplied from the vector register file 35 via RD PORT3 and RD PORT4 
Vector adder 80 performs { HEAD ~ integer and floating point add or subtract operations } on { TAIL ~ two 64 bit words } supplied from the vector register file 35 via RD PORT3 and RD PORT4
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH