[Webkit-unassigned] [Bug 152202] New: Reconsider B3's constant motion policy

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152202

            Bug ID: 152202
           Summary: Reconsider B3's constant motion policy
    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

It appears that on asm.js code, our constant motion is wrong:

- It pins tags to registers even though the tags are not used frequently enough to warrant it.
- It doesn't pin the heap base to a register even though it is used frequently enough to warrant it.

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