message: Make constexpr
diff: @@ -55,8 +55,8 @@ inline array<unsigned, simd::num_elements<I>::value> make_random_seed(I val0, I
  simd::store(arr_v0, val0);
  simd::store(arr_v1, val1);
  - int pw = packet_size<S>::w;
  - int ph = packet_size<S>::h;
  + constexpr int pw = packet_size<S>::w;
  + constexpr int ph = packet_size<S>::h;
  for (int i = 0; i < pw * ph; ++i)
  {
  