[Webkit-unassigned] [Bug 117066] New: [sh4] Fix floating point comparisons in baseline JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117066

           Summary: [sh4] Fix floating point comparisons in baseline JIT
           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


Current implementation of branchDouble function in baseline JIT is wrong for some conditions (1) and overkill for others (2).

(1) With DoubleGreaterThanOrEqual condition for instance, branch will be taken if either operand is NaN with current implementation whereras it should not.
(2) With DoubleNotEqualOrUnordered condition for instance, performed NaN checks are useless (because comparison result is false if either operand is NaN).

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