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I think this is _Alignas/alignas.

    struct foo {
        _Alignas(64) float x,y;
        _Alignas(64) int     z;
    };
    _Static_assert(sizeof(struct foo) == 192, "");


The example I linked uses alignas, but the key is knowing what value to pass. std::hardware_destructive_interference_size tells you what the current/target hardware's correct align value is, which is the challenge.




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