+#if defined (CLIB_HAVE_VEC512)
+ u64x8 v;
+ v = u64x8_load_unaligned (a) ^ u64x8_load_unaligned (b);
+ return (u64x8_is_zero_mask (v) & 0x1f) == 0;
+#elif defined (CLIB_HAVE_VEC256)
+ u64x4 v = { a[4] ^ b[4], 0, 0, 0 };
+ v |= u64x4_load_unaligned (a) ^ u64x4_load_unaligned (b);
+ return u64x4_is_all_zero (v);
+#elif defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
+ u64x2 v = { a[4] ^ b[4], 0 };
+ v |= u64x2_load_unaligned (a) ^ u64x2_load_unaligned (b);
+ v |= u64x2_load_unaligned (a + 2) ^ u64x2_load_unaligned (b + 2);
+ return u64x2_is_all_zero (v);
+#else