[Webkit-unassigned] [Bug 65160] New: DFG non-speculative JIT emits inefficient code for arithmetic involving two registers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65160

           Summary: DFG non-speculative JIT emits inefficient code for
                    arithmetic involving two registers
           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 DFG non-speculative JIT emits code for arithmetic that uses C helper functions in case the operands are not integers.  This results in bad performance regressions in case of speculation failure, where the hot code involves arithmetic on doubles.  The DFG non-speculative JIT should inline double arithmetic whenever possible, much like the old JSC JIT did.

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