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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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23 changed files with 226 additions and 144 deletions
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@ -187,7 +187,7 @@ struct ImportEntry;
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class ImportStatement;
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class Identifier;
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class Intrinsics;
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struct IteratorRecord;
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class IteratorRecord;
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class MemberExpression;
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class MetaProperty;
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class Module;
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