test_vpkuhus128_1:
  # {0, 256, 1, 257, 2, 258, 3, 259}
  #_ REGISTER_IN v3 [00000100, 00010101, 00020102, 00030103]
  # {4, 260, 5, 261, 6, 262, 7, 263}
  #_ REGISTER_IN v4 [00040104, 00050105, 00060106, 00070107]
  vpkuhus128 v5, v3, v4
  blr
  #_ REGISTER_OUT v3 [00000100, 00010101, 00020102, 00030103]
  #_ REGISTER_OUT v4 [00040104, 00050105, 00060106, 00070107]
  # {0, 255, 1, 255, 2, 255, 3, 255, 4, 255, 5, 255, 6, 255, 7, 255}
  #_ REGISTER_OUT v5 [00FF01FF, 02FF03FF, 04FF05FF, 06FF07FF]