[Webkit-unassigned] [Bug 152952] New: Air needs a Shuffle instruction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152952

            Bug ID: 152952
           Summary: Air needs a Shuffle instruction
    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

Shuffle would allow you to shuffle data between multiple temporaries and memory locations.  It can be lowered to Move's late.  There are a variety of things we can use this for:

- More efficient lowering of Phi/Upsilon.
- Strength reduction of multiple consecutive Move instructions.
- Intelligently marshalling arguments.

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