https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96019

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> So AFAIU
> 
> int main(int argc, char *argv[]) {
>     uint8_t raw[] = { 0xaa, 0xbb, 0xcc, 0xdd, 0x11, 0x22 };
>     SS instance;
>     memcpy (&instance, raw, sizeof (SS));
>     printf("%x, %x\n", instance.a, instance.b);
>     return 0;
> }
> 
> would be OK(?)

Yes, this should work once the patch (or a variant thereof) I posted some time
ago to make memcpy a storage order barrier is installed. :-)

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