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Code Issues Projects Releases Packages Wiki Activity Actions 10

LibJS: Make GetById cache polymorphic

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Instead of monomorphic (1 shape), GetById inline caches are now
polymorphic (4 shapes).

This improves inline cache hit rates greatly on most web JavaScript.
For example, Speedometer 2.1 sees 88% -> 97% cache hit rate improvement.

1.71x speedup on MicroBench/pic-get-own.js
1.82x speedup on MicroBench/pic-get-pchain.js
This commit is contained in:
Andreas Kling 2025-05-06 13:16:44 +02:00 • committed by Andreas Kling
parent 678c15a06a
commit a677d96b8f
Notes: github-actions[bot] 2025-05-06 22:28:14 +00:00
2 changed files with 59 additions and 43 deletions
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13
Libraries/LibJS/Bytecode/Executable.h
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@ -23,11 +23,16 @@
namespace JS::Bytecode {
// Represents one polymorphic inline cache used for property lookups.
struct PropertyLookupCache {
WeakPtr<Shape> shape;
Optional<u32> property_offset;
WeakPtr<Object> prototype;
WeakPtr<PrototypeChainValidity> prototype_chain_validity;
static constexpr size_t max_number_of_shapes_to_remember = 4;
struct Entry {
WeakPtr<Shape> shape;
Optional<u32> property_offset;
WeakPtr<Object> prototype;
WeakPtr<PrototypeChainValidity> prototype_chain_validity;
};
AK::Array<Entry, max_number_of_shapes_to_remember> entries;
};
struct GlobalVariableCache : public PropertyLookupCache {