[Webkit-unassigned] [Bug 163548] New: Air::IRC doesn't need to have a special-case for uncolored Tmps since they all get colored

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163548

            Bug ID: 163548
           Summary: Air::IRC doesn't need to have a special-case for
                    uncolored Tmps since they all get colored
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

IRC used to assume that no-degree Tmps can get any color. That's not true. No degree does not really mean no interference because of coalescable Moves. Bug 163509 was about that. Now we just need to remove the other side of this special case: IRC still has a special case for uncolored Tmps. We don't need that anymore - a truly unused Tmp will get handled naturally by the algorithm.

If we ever find that large numbers of unused Tmps are putting a stress on IRC and making it run longer, then we could just add a Tmp pruning pass.

Also, it turns out that this special case is hiding other bugs.  I'm investigating those now.

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