Making all divisions slower to fix a bug in 0.000000000000000000542% of cases (futhark-lang.org)

That's the most frustrating thing about compiler engineering

You fix some feature, some workload, but performance regression appears in other which relied on some bullshit -

unwritten convention, ordering, function name, luck, alignment of the stars, whatever.

You spent 2 weeks fixing a thing and you still have to get back to it because someone is pissed off.