https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109230
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So are we talking about typedef float V __attribute__((vector_size (16))); typedef int VI __attribute__((vector_size (16))); V foo (V x, V y) { V a = x - y; V b = y + x; return __builtin_shuffle (b, a, (VI) { 0, 5, 2, 3 }); } then?