If anyone is interested, here are the results on my M1 Pro running Asahi Linux:

Min: 48.3 Max: 175.0 Mean: 133.0

I’ll try to copy the exact results once I have a browser on Asahi, but the general pattern is most pairs have >150ns and a few (0-1; 2-3,4,5; 3-4,5; 4-5; 6-7,8,9; 7-8,9; 8-9) are faster at about 50ns.

Edit: The results from c2clat (a little slower, but the format is nicer) are below.

CPU 0 1 2 3 4 5 6 7 8 9

   0    0   59  231  205  206  206  208  219  210  210

   1   59    0  205  215  207  207  209  209  210  210

   2  231  205    0   40   42   43  180  222  224  213

   3  205  215   40    0   43   43  212  222  213  213

   4  206  207   42   43    0   44  182  227  217  217

   5  206  207   43   43   44    0  215  215  217  217

   6  208  209  180  212  182  215    0   40   43   45

   7  219  209  222  222  227  215   40    0   43   43

   8  210  210  224  213  217  217   43   43    0   44

   9  210  210  213  213  217  217   45   43   44    0