mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 21:07:35 +00:00
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);
This commit is contained in:
parent
4966c083df
commit
4699c81fc1
23 changed files with 226 additions and 144 deletions
|
@ -189,6 +189,7 @@ public:
|
|||
virtual bool is_proxy_object() const { return false; }
|
||||
virtual bool is_native_function() const { return false; }
|
||||
virtual bool is_ecmascript_function_object() const { return false; }
|
||||
virtual bool is_iterator_record() const { return false; }
|
||||
|
||||
// B.3.7 The [[IsHTMLDDA]] Internal Slot, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
|
||||
virtual bool is_htmldda() const { return false; }
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue