https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121352
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
That patch deliberately takes care not to optimize in presence of the
attribute:
/* Upgrade TLS access model based on optimized visibility status,
unless it was specified explicitly or no references remain. */
if (DECL_THREAD_LOCAL_P (decl)
&& !lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl))
&& vnode->ref_list.referring.length ())
{
