![]() ![]() ![]() NET Core 3.0 is bringing mixed AOT/JIT into the mix, with further improvements planned for. NET Native had a few issues with reflection, so. This circle goes around every time the application is updated or PGO information gets invalidated. There is also the whole ART reboot, where Google made the mistake of not doing AOT the same way as Microsoft did for the Windows Store, by compiling on the device instead of the more beefy store cluster, so they ended up with a mix of fast interpreter written in straight Assembly, a first tier JIT with PGO, and an AOT compiler that takes PGO profiles and really optimizes the critical paths while the device is idle. NET are converging, by having both AOT/JIT on the box, alongside JIT caches. This is the current state of the art of JSC's bottom interpreter tier FWIW. I learned it from HotSpot, and I guess that design was based on a Strongtalk VM. In the LLInt, the IC/type logic is either a win (ICs are always a win) or neutral (value profiling and case flag profiling costs nothing in LLInt).Īlso worth noting that this architecture - a JIT ABI interpreter that collects types as a bottom tier - is older than any JS engine. ![]() But not too weird, if the IC logic in the new interpreter is costly. It's weird that they kept the C++ interpreter. ![]() Bottom tiers must include a fast interpreter that uses JIT ABI and collects types (Ignition and this Moz interpreter smells a lot like JSC's LLInt, which pioneered exactly this for JS). More than just two tiers (JSC has four, and I guess Moz has four too now I guess it's just a matter of time before V8 follows). Worth noting that this basically means that all of the JS engines are converging on what JavaScriptCore pioneered: ![]()
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