On Thu, 18 Jul 2024 20:11:03 GMT, Vladimir Ivanov <vliva...@openjdk.org> wrote:
> Alternatively, `Klass::is_subtype_of()` can unconditionally perform linear > search over secondary_supers array. > > Even though I very much like to see table lookup written in C++ (accompanying > heavily optimized platform-specific MacroAssembler variants), it would make > C++ runtime even simpler. It would, but there is something to be said for being able to provide a fast "no" answer for interface membership. I'll agree it's probably not a huge difference. I guess `is_cloneable_fast()` exists only because searching the interfaces is slow. Also, if table lookup is written in C++ but not used, it will rot. Also also, `Klass::is_subtype_of()` is used for C1 runtime. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/19989#discussion_r1686707925
