https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127481
--- Comment #1 from Hongtao Liu <liuhongt at gcc dot gnu.org> --- > I admit I don't know what from these is faster and if there are CPUs without > GFNI and with AVX512_BITALG or vice versa. There are currently no processors that support AVX512_BITFLAG without also supporting GFNI, however processors that support GFNI without AVX512 do exist. Most processor either only support GFNI or support both. For processors where AVX256 is optimal, the GFNI-based implementation will probabaly better.
