[Webkit-unassigned] [Bug 163172] New: B3 should know about mutable pinned registers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163172

            Bug ID: 163172
           Summary: B3 should know about mutable pinned registers
    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

Super funny fact: if you add pinned registers and their values are designed to be changed (like WebAssembly memory base/size), then B3 needs to know about them so that it can do effects analysis of operations that clobber registers versus operations that read from them!

Note that we wouldn't need this for read-only pinned registers.  Then we could model them using ArgumentReg and just teach Air to not use them.  Hence how this is about mutable pinned even though the functionality could be used to support immutable pinned, too.

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