[Webkit-unassigned] [Bug 75291] New: spill unboxed values in DFG 32_64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75291

           Summary: spill unboxed values in DFG 32_64
           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: yuqiang.xian at intel.com
                CC: barraclough at apple.com, fpizlo at apple.com


Currently all the values are spilled as boxed in DFG 32_64, which is not necessary and introduces additional stores/loads. Instead we can spill them as unboxed if feasible. It can be applied to the Integers, Cells and Booleans in DFG 32_64. Doubles are left as is because they don't need to be boxed at all. The modifications to the spill/fill and the OSR exit are required, as well as a bug fix to the "isUnknownJS" logic.

Patch forthcoming.

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