Depending on usage patterns, you might see a further speed boost if you
split your objects into two parts, where one has the same shape for all
objects and the other is type dependent, roughly:
class Thing {
constructor(type, specific, ...) {
this.type = type;
this.other_common_field = ...;
// If type === 100, this is a Foo; if type === 101, it's a Bar; etc.
this.type_specific_stuff = specific;
}
}
var x = new Thing(100, new Foo(...), ...); // Maybe wrap in a factory?
if (x.type === 100) {
var data = x.type_specific_stuff.foo_field; // Both loads are
monomorphic, yay!
}
On Thu, Mar 1, 2018 at 12:31 PM Andrew Wilcox <andrew.wil...@gmail.com>
wrote:
> can anyone tell me what LoadIC is?
>>
>>
>
>> The thing that handles property loads (like foo.bar;).
>
>
> Thank you Jacob!
>
>
> Seeing it take 22% is rare. Is your app heavy on polymorphic property
>> loads?
>
>
> Yes, I'm writing an interpreter and it was doing a *lot* of instanceof
> checks. Since I don't have undefined or null values in my interpreter,
> rather than use x instanceof Foo I can instead give Foo instances a
> "type" property of e.g. 100 and use x.type === 100, which is faster. So
> indeed yes, now it's doing a lot of polymorphic property loads! :-) Makes
> perfect sense, thanks!
>
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