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Update atomics.h #63

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kehongzhang
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The fetchadd64_acquire only have load acquire barrier. It may lead to load/store before the synchronize could be speculated after of load/store after the synchronize.
So, change fetchadd64_acquire to fetchadd64_acquire_release to ensure load/store order.

The fetchadd64_acquire only have load acquire barrier. It may lead to load/store before the synchronize could be speculated after of load/store after the synchronize.
So, change fetchadd64_acquire to fetchadd64_acquire_release to ensure load/store order.
@rpgolshan
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Can you help me understand your comment?

It may lead to load/store before the synchronize could be speculated after of load/store after the synchronize.

What is synchronize? Can you put line numbers or code for load/store and synchronize?

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