https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67406
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- No, you can only use -mfma and affect code generation for all the clones, not just one. Cilk+ has some processor clause or so which allows one to choose the ISA, but only the ISA and not actually further options.