Method invocation performance improvements

[iskiselev]

Here I want to gather list of task that could be done for method invocation performance improvements, test results and ideas.

• [ ] Always use signatures for generic method calls - it works faster in all engines except SpiderMonkey.
• [ ] Always pass resolved types as generic arguments to calls through signatures for generic methods. Probably cache array of resolved type arguments inside caller method. It will slightly improve generic method invocations, and make generic invocations through signature always preferable in all engines.
• [x] Make interface method with fallback cache-able, at least for types where we don't use fallback. Now this calls are 100-times slower even if actually we don't need any fallback.

[iskiselev]

arguments.length extremely slow under Chakra (IE/Edge). We should use signatures with all generic methods and methods that differs in arguments count.

[kg]

That's unfortunate. Have you filed a bug? Tons of production software requires on it being fast to check arguments.length.

[iskiselev]

Microsoft/ChakraCore#1083

[iskiselev]

I don't know, but looks there is something else. My test on JSIL overload dispatch (based on arg number): Chrome: ~315ms Firefox: ~175ms Edge: ~13500ms

Call through qualified signature: Chrome: ~290ms Firefox: ~185ms Edge: ~360ms

Based on my simple test in Microsoft/ChakraCore#1083 I could expect 2-5 slower than Chrome. Actually Edge is 80 times slower!