[Webkit-unassigned] [Bug 15861] New: JavaScriptCore needs to pull constants out of loops

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=15861

           Summary: JavaScriptCore needs to pull constants out of loops
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: mjs at apple.com


JavaScriptCore needs to pull constants out of loops

SpiderMonkey beats us on the "validate-input" test dramatically.
    validate-input:    58.2% *slower*   115.2ms +/- 1.2%    182.2ms +/- 0.7%   
 significant

I think much of that is due to them having some magical way to recognize
constants and pull them out of for loops.

in doTest()

There is a "pattern" constant regexp, which we re-compile every time through
the loop. If I hack the test to pull that out of the loop, we get a 14% speed
increase in that one test:

    validate-input:    14.6% faster     162.8ms +/- 0.8%    139.0ms +/- 1.1%   
 significant


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