[Webkit-unassigned] [Bug 225465] New: Reduce use of dmb ish on ARM64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225465

            Bug ID: 225465
           Summary: Reduce use of dmb ish on ARM64
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

We use loadLoadFence a lot, often in situations like:

Foo* ptr = loadStuff;
loadLoadFence();
use ptr

On ARM64, we don't need a dmb ish here.  We also use loadLoadFence in some places where I can't actually think of any good reason for the fence other than paranoia.

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