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  1. JDK
  2. JDK-8319777

Zero: Support 8-byte cmpxchg

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        See related discussion in JDK-8318776.

        I think we can claim Zero is supports_cx8() = true, because we have enough fallbacks for 8-byte CASes to work. Note that some code already reaches for these without checking for supports_cx8(), so the proverbial horses have already left the barn.

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                shade Aleksey Shipilev
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