[Webkit-unassigned] [Bug 158020] [ESNext] Support trailing commas in function param lists

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158020

--- Comment #22 from GSkachkov <gskachkov at gmail.com> ---
(In reply to comment #21)
> Comment on attachment 280527 [details]
> Patch
> 
> Let's try landing it. Can you also run sunspider locally to see if you see
> any perf regressions?

See results:

VMs tested:
"withoutfix" at /Users/Developer/Projects/Webkit2/WebKitBuild/trailing_comma_perf/Release/jsc
"withfix" at /Users/Developer/Projects/Webkit2/WebKitBuild/trailing_comma/Release/jsc

Collected 4 samples per benchmark/VM, with 4 VM invocations per benchmark. Ran 8 benchmark iterations, and
measured the total time of those iterations, for each sample. Emitted a call to gc() between sample
measurements. Used 32 benchmark iterations per VM invocation for warm-up. Used the jsc-specific
preciseTime() function to get microsecond-level timing. Reporting benchmark execution times with 95%
confidence intervals in milliseconds.

                                  withoutfix                 withfix                                      

3d-cube                        83.8227+-24.3184          76.9651+-3.2111          might be 1.0891x faster
3d-morph                       67.9703+-6.1130     ?     69.4963+-4.5539        ? might be 1.0225x slower
3d-raytrace                    78.9442+-4.0375     ?     81.5590+-4.3219        ? might be 1.0331x slower
access-binary-trees            38.6298+-1.6829     ?     39.4618+-3.5157        ? might be 1.0215x slower
access-fannkuch               117.1779+-12.1635    ?    117.5690+-4.4082        ?
access-nbody                   40.1360+-22.6709          32.2021+-0.6917          might be 1.2464x faster
access-nsieve                  36.1190+-3.4944           35.7054+-2.2991          might be 1.0116x faster
bitops-3bit-bits-in-byte       14.3125+-0.6476     ?     14.4402+-1.7659        ?
bitops-bits-in-byte            38.8101+-2.2190           38.4263+-5.0924        
bitops-bitwise-and             22.1407+-2.9088           21.9016+-2.3408          might be 1.0109x faster
bitops-nsieve-bits             51.7688+-3.1459           50.5560+-3.9563          might be 1.0240x faster
controlflow-recursive          56.6677+-16.0759          52.8937+-3.5335          might be 1.0714x faster
crypto-aes                     57.3966+-6.6903     ?     75.6738+-37.2029       ? might be 1.3184x slower
crypto-md5                     37.9637+-3.9742     ?     38.3545+-2.0614        ? might be 1.0103x slower
crypto-sha1                    37.6180+-1.6728           37.4700+-3.6662        
date-format-tofte             107.7530+-9.8035          103.5540+-7.2543          might be 1.0405x faster
date-format-xparb             119.6010+-4.8767          110.3923+-20.2829         might be 1.0834x faster
math-cordic                    38.0562+-2.3593     ?     45.7181+-31.6069       ? might be 1.2013x slower
math-partial-sums              61.3655+-10.2370          58.5570+-5.7249          might be 1.0480x faster
math-spectral-norm             26.5539+-0.4367     ?     27.1837+-0.9924        ? might be 1.0237x slower
regexp-dna                     72.3824+-0.6244     ?     74.6293+-4.1073        ? might be 1.0310x slower
string-base64                  61.9043+-9.7523     ?     64.7947+-12.5870       ? might be 1.0467x slower
string-fasta                   84.9805+-7.7918     ?     85.1760+-5.2455        ?
string-tagcloud               114.4025+-15.2375         108.3253+-8.7008          might be 1.0561x faster
string-unpack-code            220.5273+-18.0041    ?    223.9689+-8.9968        ? might be 1.0156x slower
string-validate-input          72.3325+-33.0462          55.1055+-1.3751          might be 1.3126x faster

<arithmetic>                   67.6668+-1.1993           66.9261+-2.3691          might be 1.0111x faster

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