[Webkit-unassigned] [Bug 84449] New: DFG JIT is not ARM EABI compatible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84449

           Summary: DFG JIT is not ARM EABI compatible
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yong.li.webkit at gmail.com
                CC: oliver at apple.com, staikos at kde.org,
                    barraclough at apple.com, fpizlo at apple.com,
                    mhahnenberg at apple.com


EABI requies that 64-bit integer when being passed as argument must start at an even number register (r0-r1 or r2-r3). But current DFG JIT doesn't take care of this, and assumes 64-bit integer can be passed through r1, r2.

I have a patch to work around this issue (will submit it soon). But that looks ugly. Any idea about a neat solution?

Also I don't see DFG boosts performance on sunspider. Actually DFG gives worse result. Any idea about this?

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