[Webkit-unassigned] [Bug 64903] New: DFG speculative JIT sometimes claims to use compare operands twice, leading to use count corruption

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64903

           Summary: DFG speculative JIT sometimes claims to use compare
                    operands twice, leading to use count corruption
           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 speculative JIT's compare() helper method may call the JITCodeGenerator's non-speculative compare helper, which calls use() on the operands.  But then SpeculativeJIT::compare() also calls use() on the operands.  The SpeculativeJIT::compare() method should not call use() on the operands if the JITCodeGenerator has already done so.

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