https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120426
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #3)
> (In reply to Andrew Pinski from comment #2)
> > With -mtune=sapphirerapids we get:
> >
> > <bb 2> [local count: 1073741824]:
> > MEM <unsigned long> [(union *)lock_2(D)] = 0;
> > MEM <unsigned long> [(union *)lock_2(D) + 8B] = 0;
> > MEM <unsigned long> [(union *)lock_2(D) + 16B] = 1;
> > MEM <vector(2) long unsigned int> [(union *)lock_2(D) + 24B] = { 0, 0 };
> >
> >
> > Which is because we don't combine "memset"s into large ones yet.
> > Which is PR 49872.
>
> Do you have a patch I can try? Or I can extend STV pass to cover this
> particular
> case.
I don't have a patch right now, maybe in 2 or 3 weeks. It is one of the things
I am working towards
