[Webkit-unassigned] [Bug 56168] New: Avoid slow-path for put() in Array.slice()
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Mar 10 19:45:59 PST 2011
https://bugs.webkit.org/show_bug.cgi?id=56168
Summary: Avoid slow-path for put() in Array.slice()
Product: WebKit
Version: 528+ (Nightly build)
Platform: All
OS/Version: All
Status: NEW
Keywords: Performance
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: kling at webkit.org
Array.slice() currently creates the returned array early on.
We can defer it until we know the number of elements to include, and use the CreateCompact mechanism to avoid the put() slow-path when populating the array.
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