Rate    regex unpack_C unpack_a    split split_pa
regex    10.4/s       --      -2%     -44%     -50%     -73%
unpack_C 10.6/s       2%       --     -43%     -49%     -73%
unpack_a 18.8/s      79%      76%       --     -10%     -52%
split    20.9/s     100%      97%      12%       --     -46%
split_pa 38.8/s     271%     264%     107%      85%       --