[Webkit-unassigned] [Bug 117049] New: [sh4] Optimize NaN checks in LLINT for floating point comparisons

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117049

           Summary: [sh4] Optimize NaN checks in LLINT for floating point
                    comparisons
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jbrianceau at nds.com


Use the fcmp/eq opcode in sh4 LLINT to test if a double is NaN.

This is more efficient, doesn't require two tmp registers and requires less code than current implementation (which converts double to float, then checks 'E = Emax + 1' and 'f != 0').

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