[Webkit-unassigned] [Bug 68316] DFG JIT does not have full block-local CSE

Sat Sep 17 14:08:42 PDT 2011

https://bugs.webkit.org/show_bug.cgi?id=68316

--- Comment #1 from Filip Pizlo <fpizlo at apple.com>  2011-09-17 14:08:42 PST ---
Created an attachment (id=107773)
 --> (https://bugs.webkit.org/attachment.cgi?id=107773&action=review)
work in progress

Still working on this, but it's pretty awesome for Kraken.

Benchmark report for Kraken.

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

ai-astar                             634.8768+-5.2150        632.3351+-4.7085       
audio-beat-detection                 467.5151+-1.2716        465.7044+-1.3745       
audio-dft                            423.1598+-2.3857        421.5126+-2.3649       
audio-fft                            364.7906+-1.2717    ?   365.5174+-1.0969       ?
audio-oscillator                     312.1471+-1.5005    ?   331.5295+-21.8849      ? might be 1.0621x slower
imaging-darkroom                     412.6474+-1.6945        411.6372+-1.1734       
imaging-desaturate                   207.4252+-0.7089    !   221.9861+-0.8245       ! definitely 1.0702x slower
imaging-gaussian-blur               1082.7893+-2.2880    ^   591.5093+-0.8721       ^ definitely 1.8306x faster
json-parse-financial                  49.5232+-0.2997    ?    50.3901+-1.3708       ? might be 1.0175x slower
json-stringify-tinderbox              68.0220+-0.2688         67.8016+-0.6565       
stanford-crypto-aes                  144.5714+-0.6423        143.6752+-1.0772       
stanford-crypto-ccm                  110.8207+-0.2111        110.1401+-0.5823       
stanford-crypto-pbkdf2               396.3371+-1.5674        394.0494+-5.6482       
stanford-crypto-sha256-iterative     148.7113+-0.6486    ?   149.4918+-0.3482       ?

<arithmetic>                         344.5241+-0.4476    ^   311.2343+-1.5880       ^ definitely 1.1070x faster
<geometric>                          252.2160+-0.3048    ^   243.4866+-0.8714       ^ definitely 1.0359x faster
<harmonic>                           174.4002+-0.3305        174.1282+-0.7948

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