[Webkit-unassigned] [Bug 63684] New: DFG non-speculative JIT always performs slow C calls for div and mod

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63684

           Summary: DFG non-speculative JIT always performs slow C calls
                    for div and mod
           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


For division it's safe to always do it using the FPU, and for modulo it's best to first try integer mod and then revert to FPU mod.  This strategy will outperform the current one, which always results in slow C calls and register spilling.

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