This results in quicker compilation with stable performance at the same time. This approach allows you to apply tiered compilation to all methods. Previously, this feature was only available between method calls. OSR allows you to replace the machine code that is currently running with a new, more optimized one. By the way, at the moment there are only two levels. This approach does not work, for example, with loops, because this can degrade the performance. If the number of method calls exceeds a certain threshold, JIT generates more optimized code for this method (tier-1). How? Initially, JIT generates poorly optimized machine code (tier-0) for methods because it simply takes less time. In simple terms, tiered compilation improves the startup time of an application. NET, there is such a thing as tiered compilation. no runtime code generation (for example, ).no dynamic loading (for example, Assembly.LoadFile). Native AOT applications come with a few limitations:
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