> If we are talking about a call like Arrays.setAll(array, function) and you have one or two candidates for function, then you are mono- or bimorphic. If you ha

> If we are talking about a call like Arrays.setAll(array, function) and you have one or two candidates for function, then you are mono- or bimorphic. If you have 25 candidates for function, you are highly polymorphic. I don't understand what you mean by a mono- or bimorphic scenario with up to 25 candidates. Sorry, I phrased that poorly. What I was trying to say was that the moment we introduced a 3rd candidate the performance with C2 decreased by ~5x. Whereas with Graal the performance stayed virtually the same when introducing a 3rd or 4th candidate. And it was performing well. But it did decrease at some point after adding more and more candidates and then the performance hit was much bigger. I will reach out to my colleagues still working on this next week (long weekend ahead where I live). If we can reproduce this with a current Graal release, I'll share the benchmark – always happy to learn something new and if it is 'just' why out benchmark is broken. :)