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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment"
href="https://bugs.webkit.org/show_bug.cgi?id=149338#c76">Comment # 76</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment"
href="https://bugs.webkit.org/show_bug.cgi?id=149338">bug 149338</a>
from <span class="vcard"><a class="email" href="mailto:gskachkov@gmail.com" title="GSkachkov <gskachkov@gmail.com>"> <span class="fn">GSkachkov</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=149338#c73">comment #73</a>)
<span class="quote">> I renamed the bug to better indicate what the patch is doing.
>
> How is performance on this bug? Can you run the perf tests
> just to make sure we haven't regressed on things non-arrow function related.
> We may have regressed slightly on some arrow-function tests, but that's
> expected. Also, this will get better once you implement some basic static
> analysis for "this" usage so we don't store "this" in the environment unless
> we really need to.</span >
See result by link <a href="https://bugs.webkit.org/attachment.cgi?id=265179">https://bugs.webkit.org/attachment.cgi?id=265179</a>, Results are neutral except following tests:
arrowfunction-call 95.9133+-5.5082 ! 338.3422+-14.9020 ! definitely 3.5276x slower
and small performance degradation:
function-with-eval 708.1514+-8.0792 ! 748.3060+-10.7312 ! definitely 1.0567x slower
is-object-or-null-tricky-internal-function
59.8600+-1.4660 ! 74.9355+-10.1182 ! definitely 1.2518x slower
setter 50.4615+-2.1227 ! 64.9183+-12.1934 ! definitely 1.2865x slower</pre>
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