I fully agree these things are difficult and not well defined how to benchmark this. Actually thinking on what you wrote the sum+= should lead to WAW and RAW co

I fully agree these things are difficult and not well defined how to benchmark this. Actually thinking on what you wrote the sum+= should lead to WAW and RAW conflicts, which might not allow full ultilization of the execution ports. It would be interesting to see if having 10 temp(or 16ä ) variables each accumulating one tenth of the dara will run faster. All conflicts should be solvable then