[libcxx-commits] [clang] [libcxx] [clang] Add builtin to clear padding bytes (prework for P0528R3) (PR #75371)

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gonzalobg wrote:

Can you describe the algorithm for `compare_exchange` for `atomic_ref` that handles the case where the in-memory padding is not zero and how that algorithm uses this intrinsic? 

https://github.com/llvm/llvm-project/pull/75371