Benchmark:  running
  japhy_int, japhy_round, japhy_inplace,
  rob_int, rob_round
for at least 5 CPU seconds...

 japhy_int:     20326.40/s (n=108543)
japhy_round:     3272.93/s (n= 17412)
japhy_inplace:  11470.71/s (n= 61483)
   rob_int:     11797.18/s (n= 62643)
 rob_round:      1964.03/s (n= 10429)

                 Rate rob_round japhy_round japhy_inplace rob_int japhy_int
rob_round      1964/s        --        -40%          -83%    -83%      -90%
japhy_round    3273/s       67%          --          -71%    -72%      -84%
japhy_inplace 11471/s      484%        250%            --     -3%      -44%
rob_int       11797/s      501%        260%            3%     --       -42%
japhy_int     20326/s      935%        521%           77%     72%        --