[Webkit-unassigned] [Bug 156147] [JSC] implement async functions proposal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156147

--- Comment #98 from Yusuke Suzuki <utatane.tea at gmail.com> ---
(In reply to comment #97)
> The dromaeo results for the latest patch are about 3-4% regressions for each
> test. With the branch prediction adjustment, there's a 5-10% improvement (If
> there's a command to dump results of run-perf-tests as text, I'll provide
> all the numbers).
> 
> With the command `run-jsc-benchmarks --outer 10 --octane --benchmark
> "closure|jquery" baseline:~/git/WebKit2/WebKitBuild/Release/DumpRenderTree
> asyncawait:~/git/WebKit/WebKitBuild/Release/DumpRenderTree`, results are:
> 
>                          baseline                 asyncawait                
> 
> 
> closure              0.30989+-0.00551          0.30340+-0.00295        
> might be 1.0214x faster
> jquery               3.65550+-0.01427    !     3.78112+-0.03262       !
> definitely 1.0344x slower
> 
> <geometric>          1.06425+-0.01004    ?     1.07103+-0.00613       ?
> might be 1.0064x slower
> ---
> 
> The jquery results might look a little worse than previously described, but
> the fact that Dromaeo consistently does so much better with the branch
> predictions added goes a long way in my opinion.
> 
> Ensuring that `m_runtimeFlags` is packed efficiently and accessed in cache
> more often will probably see some improvement, but hard to guess how much

Personally, I think it is ok if we can track this in the separated bug after this change. (and we need to look into it :))

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