Benchmark: timing 1000 iterations of f_alpha, f_cmp, f_owtdi, f_sship, i_alpha, i_cmp, i_owtdi, i_sship...
   f_alpha: 141 wallclock secs (140.97 usr +  0.02 sys = 140.99 CPU)
     f_cmp: 228 wallclock secs (227.89 usr +  0.16 sys = 228.05 CPU)
   f_owtdi: 192 wallclock secs (190.93 usr +  1.75 sys = 192.68 CPU)
   f_sship: 164 wallclock secs (163.18 usr +  0.09 sys = 163.27 CPU)
   i_alpha: 118 wallclock secs (118.25 usr +  0.11 sys = 118.36 CPU)
     i_cmp: 203 wallclock secs (203.10 usr +  0.23 sys = 203.33 CPU)
   i_owtdi: 191 wallclock secs (190.90 usr +  1.96 sys = 192.86 CPU)
   i_sship: 163 wallclock secs (162.19 usr +  0.15 sys = 162.34 CPU)
         Rate    f_cmp   i_cmp   i_owtdi f_owtdi f_sship i_sship f_alpha i_alpha
f_cmp     4.39/s      --    -11%    -15%    -16%    -28%    -29%    -38%    -48%
i_cmp     4.92/s     12%      --     -5%     -5%    -20%    -20%    -31%    -42%
i_owtdi   5.19/s     18%      5%      --     -0%    -15%    -16%    -27%    -39%
f_owtdi   5.19/s     18%      6%      0%      --    -15%    -16%    -27%    -39%
f_sship   6.12/s     40%     25%     18%     18%      --     -1%    -14%    -28%
i_sship   6.16/s     40%     25%     19%     19%      1%      --    -13%    -27%
f_alpha   7.09/s     62%     44%     37%     37%     16%     15%      --    -16%
i_alpha   8.45/s     93%     72%     63%     63%     38%     37%     19%      --