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LibJS/JIT: Add fast path for GetById of Array.length

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Array.length is magical (since it has to reflect the number of elements
in the object's property storage).

We now handle it specially in jitted code, giving us a massive speed-up
on Kraken/ai-astar.js (and probably many other things as well) :^)
This commit is contained in:
Andreas Kling 2023-11-12 15:04:23 +01:00
commit b532dedc91
Notes: sideshowbarker 2024-07-17 06:39:26 +09:00
3 changed files with 65 additions and 0 deletions
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1
Userland/Libraries/LibJS/Runtime/Array.cpp
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@ -64,6 +64,7 @@ NonnullGCPtr<Array> Array::create_from(Realm& realm, Vector<Value> const& elemen
Array::Array(Object& prototype)
: Object(ConstructWithPrototypeTag::Tag, prototype)
{
m_has_magical_length_property = true;
}
// 10.4.2.4 ArraySetLength ( A, Desc ), https://tc39.es/ecma262/#sec-arraysetlength