[JanecekPetr]

Indeed, max bytecode count (FreqInlineSize and MaxInlineSize) and inlining depth (MaxInlineLevel). Your GC choice will also slightly modify the inlining decisions, and then obviously GraalVM will be completely different.

[vips7L]

Is there a full list of the differences between the graal jit and C2? I was only aware of graal having better partial escape analysis over C2's conservative EA.

[JanecekPetr]

It's simply a completely different implementation. Some of the optimiization passes are the same, obviously, but overall it simply performs ... differently.

[kaba0]

But inlining will not cause better performance in every case, will it?

[JanecekPetr]

Correct! Inlining obviously costs CPU, code cache space, and makes the receiver method bigger so that it's less likely it will be inlined itself. If there ever is a decompilation occuring, the inlining efforts were pretty much wasted.

[masklinn]

However it must be pointed out that inlining enables further optimisations.

The tradeoffs are more complicated for a jit, but for an aot compiler it’s one of the most important optimisations in the pipeline.