Re: Fast 64-bit atomic writes (SSE?)

[Roland Dreier]

    Andi> Better is probably to use CMPXCHG8, which avoids all of
    Andi> this.

Sorry to follow up again so soon, but I just looked up CMPXCHG8, and I
don't see how to use it to write to write-only device memory.  Can you
elaborate a little?

Thanks,
  Roland
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