Re: [PATCH for-8.0 v2 12/13] target/s390x: Use tcg_gen_atomic_cmpxchg_i128 for CDSG

[Richard Henderson]

On 11/28/22 15:40, Ilya Leoshkevich wrote:
> On an s390x host we fall back to cpu_exec_step_atomic(), because in the
> configure test:
>
>        int main(void)
>        {
>          unsigned __int128 x = 0, y = 0;
>          __sync_val_compare_and_swap_16(&x, y, x);
>          return 0;
>        }
>
> x and y are not aligned. I guess that's working as intended as well,
> even though it would be nice to eventually make use of cdsg there.

I have a fix for that as a part of '[PATCH for-8.0 00/29] tcg: Improve 
atomicity support':
20221118094754.242910-14-richard.henderson@linaro.org/">https://lore.kernel.org/qemu-devel/20221118094754.242910-14-richard.henderson@linaro.org/


r~