Offer a collection of examples the user can try

[lemire]

It would be nice if the user could choose out of a small collection of examples...

E.g., here is another example...

__m128i Delta(__m128i curr, __m128i prev) {
  __m128i a = _mm_alignr_epi8(curr, prev, 12);
  return _mm_sub_epi32(curr, a);
}

c.c. @pmntang