[Webkit-unassigned] [Bug 169300] New: WTF should have LL/SC and Atomic::transaction should get it for free

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169300

            Bug ID: 169300
           Summary: WTF should have LL/SC and Atomic::transaction should
                    get it for free
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Patch forthcoming.

So far I've been able to make it so that this code:

                    lock.transaction(
                        [&] (LockType& value) -> bool {
                            value &= ~mask;
                            if (result.mayHaveMoreThreads)
                                value |= hasParkedBit;
                            return true;
                        });

Emits this code:

0000000000000338    ldaxrb    w9, [x8]
000000000000033c    and    w9, w9, #0xfffffffc
0000000000000340    orr    w9, w9, #0x2
0000000000000344    stlxrb    w10, w9, [x8]
0000000000000348    tbnz    w10, #0x0, 0x338

That's some nice LL/SC code!

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