timethis 100000: 12.2518 wallclock secs (12.18 usr +  0.00 sys = 12.18 CPU) @ 8208.16/s (n=100000)
timethis 100000: 5.47224 wallclock secs ( 5.48 usr +  0.00 sys =  5.48 CPU) @ 18261.50/s (n=100000)
timethis 100000: 195.541 wallclock secs (194.83 usr +  0.00 sys = 194.83 CPU) @513.27/s (n=100000)
timethis 100000: 5.57992 wallclock secs ( 5.55 usr +  0.00 sys =  5.55 CPU) @ 18005.04/s (n=100000)
M1A: 0
M1B: 100000
M2A: 0
M2B: 100000