On Thu, 2022-11-17 at 11:46 +0800, Jinyang He wrote:
> > So we do need an additional dbar for compare-and-exchange, but do
> > not
> > need it for a bare atomic exchange?
> Yes.

Ok, I just noticed we also don't use dbar in atomic_add etc.

I've adjusted the patch a little (in attachment): rewritten the
ChangeLog and test, and renamed "value_exchange_and" to just
"value_exchange" because we are not doing anything beyond the exchange.

If it looks OK you can just send it as v2.

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University