[Webkit-unassigned] [Bug 156147] [JSC] implement async functions proposal
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Sat May 28 10:29:47 PDT 2016
https://bugs.webkit.org/show_bug.cgi?id=156147
--- Comment #109 from Yusuke Suzuki <utatane.tea at gmail.com> ---
Comment on attachment 280020
--> https://bugs.webkit.org/attachment.cgi?id=280020
Patch
View in context: https://bugs.webkit.org/attachment.cgi?id=280020&action=review
>> Source/JavaScriptCore/parser/Parser.cpp:624
>> + if (UNLIKELY(m_runtimeFlags.isAsyncAwaitEnabled() && matchContextualKeyword(m_vm->propertyNames->async))) {
>
> There is a chance that this may be faster if the LHS and RHS were swapped because it might aid the register allocator.
> Same with the similar compare elsewhere.
> Is this what's slowing down the parser?
> Have you tried making ASYNC a key word? That may be faster than checking the IDENT's StringImpl
When executing `matchContextualKeyword(m_vm->propertyNames->async)`, it becomes `Identifier == Identifier` check and it should be pointer comparison because Identifier is already interned.
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