https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85832
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Actually, vpcmpeq zmmX, zero and vptestm zmmX, zmmX perform exactly the opposite, not the same thing, as vpcmpeq sets bits in the %kY register if zmmX element is equal to 0, while vptestm if it is not equal to 0. So we want to use vptestnm instead.
