Ahh... Good old funrollloops...
https://www.shlomifish.org/humour/by-others/funroll-loops/Ge...
Heh, "funrollloops" reminds me of recompiling FreeBSD 4 on my thinkpad back in the early aughts. The word made me imagine some sort of processed breakfast cereal with too many additives.
Right up there with fun, safe math optimizations