[Webkit-unassigned] [Bug 48060] New: Speed up op_jeq_null and op_jneq_null in JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48060

           Summary: Speed up op_jeq_null and op_jneq_null in JIT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: loki at webkit.org


For both opcodes (op_jeq_null, op_jneq_null) the NullTag and UndefinedTag are checked to control the jump. These values differ only in the lowest bit. So, we can use some arithmetic instructions instead of set and compare instruction sequences.

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