[Webkit-unassigned] [Bug 70418] New: DFG JIT 32_64 - improve double boxing/unboxing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70418

           Summary: DFG JIT 32_64 - improve double boxing/unboxing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuqiang.xian at intel.com
                CC: barraclough at apple.com, fpizlo at apple.com


The double boxing/unboxing in DFG JIT 32_64 is currently not implemented efficiently, which tries to exchange data through memory. On X86 some SSE instructions can help us on such operations with better performance, which is also marked as a FIXME in DFG 32_64.

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