[Webkit-unassigned] [Bug 63662] New: DFG JIT does not do put_by_id transition caching.
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Jun 29 15:14:35 PDT 2011
https://bugs.webkit.org/show_bug.cgi?id=63662
Summary: DFG JIT does not do put_by_id transition caching.
Product: WebKit
Version: 528+ (Nightly build)
Platform: All
OS/Version: All
Status: UNCONFIRMED
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: fpizlo at apple.com
The baseline JIT emits a stub specialized for put_by_id transitions (i.e. setting a property that did not previous exist in the object, thereby resulting in a structure transition). The DFG JIT emits a slow C call. The DFG JIT should really be emitting an optimized stub, like the baseline JIT.
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