[Webkit-unassigned] [Bug 69114] DFG does not speculate aggressively enough on put_by_id

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69114





--- Comment #2 from Filip Pizlo <fpizlo at apple.com>  2011-09-29 19:15:11 PST ---
Nice speed-up on V8.


Benchmark report for V8.

VMs tested:
"TipOfTree" at /Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc
"PutByOffset" at /Volumes/Data/pizlo/septenary/OpenSource/WebKitBuild/Release/jsc

Collected 12 samples per benchmark/VM, with 4 VM invocations per benchmark. Used 1
benchmark iteration 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.

                     TipOfTree              PutByOffset                                   

crypto            70.8626+-0.3336    !    72.0406+-0.3267       ! definitely 1.0166x slower
deltablue        227.4823+-1.2145        225.5072+-2.2500       
earley-boyer      90.0359+-0.8468    ^    87.4768+-0.3990       ^ definitely 1.0293x faster
raytrace          62.8978+-0.2882    ^    60.9215+-0.5096       ^ definitely 1.0324x faster
regexp           103.5795+-0.4278        102.7796+-0.4376       
richards         198.4522+-0.8880    ^   186.9556+-0.6424       ^ definitely 1.0615x faster
splay             90.2233+-0.3854    ?    91.0759+-0.7460       ?

<arithmetic>     120.5048+-0.2634    ^   118.1082+-0.3645       ^ definitely 1.0203x faster
<geometric>      107.8085+-0.1881    ^   106.1108+-0.2448       ^ definitely 1.0160x faster
<harmonic>        98.1841+-0.1934    ^    96.9183+-0.2551       ^ definitely 1.0131x faster

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