[libcxx-commits] [libcxx] [libc++] Increase `atomic_ref`'s required alignment for small types (PR #99654)
James Y Knight via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Jul 19 07:35:21 PDT 2024
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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
+ // used lock-free
+ static constexpr bool __min_alignement = (sizeof(_Tp) & (sizeof(_Tp) - 1)) || (sizeof(_Tp) > 16) ? 0 : sizeof(_Tp);
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jyknight wrote:
typo: `alignement` should be `alignment`.
https://github.com/llvm/llvm-project/pull/99654
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