[libcxx-commits] [libcxx] [libc++] Implement P0528R3 `std::atomic` CAS for types with paddings (PR #76180)

[Louis Dionne via libcxx-commits]

================
@@ -124,23 +146,29 @@ _LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_compare_exchange_strong(
     _Tp __value,
     memory_order __success,
     memory_order __failure) _NOEXCEPT {
-  return __c11_atomic_compare_exchange_strong(
-      std::addressof(__a->__a_value),
-      __expected,
-      __value,
-      static_cast<__memory_order_underlying_t>(__success),
-      static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
+  return __atomic_cas_with_clear_padding(
----------------
ldionne wrote:

```suggestion
  return std::__atomic_cas_with_clear_padding(
```

Also below?

https://github.com/llvm/llvm-project/pull/76180