[Webkit-unassigned] [Bug 64759] New: DFG JIT does not optimize strict equality as effectively as the old JIT does

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64759

           Summary: DFG JIT does not optimize strict equality as
                    effectively as the old JIT does
           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 old JSC JIT optimizes strict equality (===) by having a fast path for when one operand is not a cell, and neither operand is a number.  The DFG JIT only has fast-path optimizations for strict equality that speculate that both operands are integers.  The DFG JIT should have similar optimizations to the old JIT for strict equality.

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