[Webkit-unassigned] [Bug 133924] New: Bracket access is significantly slower than property access

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133924

           Summary: Bracket access is significantly slower than property
                    access
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: barraclough at apple.com, akling at apple.com,
                    fpizlo at apple.com, mhahnenberg at apple.com


Created an attachment (id=233135)
 --> (https://bugs.webkit.org/attachment.cgi?id=233135&action=review)
Microbenchmark

function getByVal(object, property) {
    return object[property];
}

function getById(object) {
    return object.myProperty;
}

The first function appears to be ~3.5x slower than the second function even if getByVal is always called as getByVal(object, 'myProperty').

It's only 1.5x slower on Chrome 35 and 2.2x slower on Firefox 30.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.