[Webkit-unassigned] [Bug 69233] New: DFG misses some obvious opportunities for common subexpression elimination

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69233

           Summary: DFG misses some obvious opportunities for common
                    subexpression elimination
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


DFG CSE has some small issues:

- It assumes that GetArrayLength is pure, even though it's not quite, since PutByVal can change the array length.

- It assumes that a PutByVal changes structures, even though it doesn't.

- It assumes that a PutByVal can affect property storage, even though it can't.

- It assumes that a PutByOffset and PutStructure can affect array values, even though they can't.

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