https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100497
--- Comment #8 from Tobias Burnus <burnus at gcc dot gnu.org> --- I am wondering whether it has something to do with shfl now requiring .sync, especially for sm_70. (Non-sync version was deprecated in ISA 6.0 and for sm_70 removed in ISA 6.4.) Cross ref: PR96005.