{
uword i = 0;
#if uword_bits == 64
-#if defined (CLIB_HAVE_VEC256)
+#if defined(CLIB_HAVE_VEC256)
while (i + 7 < vec_len (ai))
{
u64x4 v;
break;
i += 8;
}
-#elif defined (CLIB_HAVE_VEC128)
+#elif defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
while (i + 3 < vec_len (ai))
{
u64x2 v;