[libcxx-commits] [libcxx] [libc++] Increase `atomic_ref`'s required alignment for small types (PR #99654)

[James Y Knight via libcxx-commits]

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@@ -95,10 +95,14 @@ struct __atomic_ref_base {
 
   friend struct __atomic_waitable_traits<__atomic_ref_base<_Tp>>;
 
+  // require types that are 1, 2, 4, 8, or 16 bytes in length to be aligned to at least their size to allow them to be
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jyknight wrote:

I'd say "to be potentially used lock-free". We don't know if they _actually_ can or not on a given target.

https://github.com/llvm/llvm-project/pull/99654