[Webkit-unassigned] [Bug 69299] New: On X86, switch bucketCount into a register, timeoutCheck into memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69299

           Summary: On X86, switch bucketCount into a register,
                    timeoutCheck into memory
           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: barraclough at apple.com


We don't have sufficient registers to keep both in registers, and DFG JIT will trample esi; it doesn't matter if the bucketCount gets stomped on (in fact it may add to randomness!), but it if the timeoutCheck gets trashed we may make calls out to the timout_check stub function too frequently (regressing performance).  This patch has no perf impact on sunspider.

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