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LibJS: Stop converting between Object <-> IteratorRecord all the time
This patch makes IteratorRecord an Object. Although it's not exposed to author code, this does allow us to store it in a VM register. Now that we can store it in a VM register, we don't need to convert it back and forth between IteratorRecord and Object when accessing it from bytecode. The big win here is avoiding 3 [[Get]] accesses on every iteration step of for..of loops. There are also a bunch of smaller efficiencies gained. 20% speed-up on this microbenchmark: function go(a) { for (const p of a) { } } const a = []; a.length = 1_000_000; go(a);
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Notes:
sideshowbarker
2024-07-16 22:14:49 +09:00
Author: https://github.com/awesomekling
Commit: 4699c81fc1
Pull-request: https://github.com/SerenityOS/serenity/pull/22194
Reviewed-by: https://github.com/trflynn89
23 changed files with 226 additions and 144 deletions
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@ -46,8 +46,10 @@
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O(GetByValueWithThis) \
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O(GetCalleeAndThisFromEnvironment) \
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O(GetIterator) \
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O(GetObjectFromIteratorRecord) \
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O(GetMethod) \
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O(GetNewTarget) \
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O(GetNextMethodFromIteratorRecord) \
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O(GetImportMeta) \
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O(GetObjectPropertyIterator) \
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O(GetPrivateById) \
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