[Webkit-unassigned] [Bug 26014] New: Declaring an unused variable outside an empty loop speeds up the loop

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=26014

           Summary: Declaring an unused variable outside an empty loop
                    speeds up the loop
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: catfish.man at gmail.com


time ./jsc -e "function e() { for (var i = 0; i < 99999999; ++i) { } } e();"

real    0m0.389s
user    0m0.367s
sys     0m0.009s

time ./jsc -e "function e() { var a = 0; for (var i = 0; i < 99999999; ++i) { }
} e();"

real    0m0.325s
user    0m0.312s
sys     0m0.009s

It seems like something has to be going wrong for this to be the case. Using 64
bit trunk jsc, r40951, on a 2GHz Core 2 Duo MacBook.


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