https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79481
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The SDM (at least 325462-061) doesn't mention these. Though: https://software.intel.com/en-us/node/523825 and LLVM has them too.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79481
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The SDM (at least 325462-061) doesn't mention these. Though: https://software.intel.com/en-us/node/523825 and LLVM has them too.