Re: [PATCH] include/qemu/atomic128: Support 16-byte atomic read/write for Intel AVX

[Richard Henderson]

On 10/8/22 08:36, Richard Henderson wrote:
> Intel has now given guarantees about the atomicity of SSE read
> and write instructions on cpus supporting AVX.  We can use these
> instead of the much slower cmpxchg16b.
>
> Derived from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104688
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>
> Paolo, we probably ought to modify gen_ld[oy]_env_A0 to match,
> at least with CF_PARALLEL set.

Or, rather, just gen_ldo/sto.
Curiously, there are no guarantees at all for

  vmovdqa mem, %ymmN


r~