algrant added a comment. There is a (stalled) proposal to add atomic integer max/min to C++: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0493r0.pdf . The proposal has memory semantics similar to these builtins, i.e. unconditional RMW. There is no limitation to 32-bit types though, what's the motivation for that? Is it a limitation of a particular target?
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