[Webkit-unassigned] [Bug 80779] New: All DFG nodes should have a mutable set of flags

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Mar 10 22:09:39 PST 2012


https://bugs.webkit.org/show_bug.cgi?id=80779

           Summary: All DFG nodes should have a mutable set of flags
           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


Currently some nodes have a mutable set of arithmetic use flags, and all nodes have a mostly-immutable set of flags baked into their opcode.

Instead, the opcode should be a 16-bit quantity that does not include any flags, and separately, there should be a 16-bit flags that combines the current flags-that-are-in-the-opcode and the arithmetic flags.

This will facilitate richer backward flow analyses and should make manipulating the DFG IR generally easier.

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