[Webkit-unassigned] [Bug 148338] New: DFG string concatenation shouldn't be playing fast and loose with effects and OSR exit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148338

            Bug ID: 148338
           Summary: DFG string concatenation shouldn't be playing fast and
                    loose with effects and OSR exit
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

DFG string concatenation appears to have various different ways of creating an OSR exit right after a side effect.  We should change this code so that it is only speculative when it isn't effectful.  It also happens to be the case that if string concat needs to be effectful, then it will already be sufficiently slow that making it speculative won't help anyone.  So, this kind of clean-up is likely to not affect performance; it'll just make the compiler easier to hack on.

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