[libcxx-commits] [libcxx] [libcxx] atomic min/max (PR #186694)

[Damien L-G via libcxx-commits]

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@@ -258,6 +258,50 @@ __cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern, memory_o
   return __atomic_fetch_xor(std::addressof(__a->__a_value), __pattern, __to_gcc_order(__order));
 }
 
+template <typename _Tp>
+_LIBCPP_HIDE_FROM_ABI _Tp
+__cxx_atomic_fetch_min(volatile __cxx_atomic_base_impl<_Tp>* __a, _Tp __val, memory_order __order) _NOEXCEPT {
+  _Tp __old = __cxx_atomic_load(__a, memory_order_relaxed);
+  _Tp __new;
+  do {
+    __new = __old < __val ? __old : __val;
+  } while (!__cxx_atomic_compare_exchange_weak(__a, &__old, __new, __order, memory_order_relaxed));
----------------
dalg24 wrote:

```suggestion
  } while (!__cxx_atomic_compare_exchange_weak(__a, std::addressof(__old), __new, __order, memory_order_relaxed));
```
(same comment below)

https://github.com/llvm/llvm-project/pull/186694