[Webkit-unassigned] [Bug 64023] New: DFG JIT op_call implementation will flush registers even when those registers are dead

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64023

           Summary: DFG JIT op_call implementation will flush registers
                    even when those registers are dead
           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 DFG JIT op_call implementation invokes flushRegisters() to ensure that any live registers are spilled and later refilled on-demand, since in our calling convention all registers are caller-save.  However, in the current implementation flushRegisters() may also flush registers that are killed by the call.

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