Benchmark: timing 300 iterations of m_array, m_array_M, m_for, m_for_M, m_while, m_while_M, s_index, tr, while_re...
   m_array: 12 wallclock secs ( 5.04 usr +  0.04 sys =  5.08 CPU) @ 59.06/s (n=300)
 m_array_M: 11 wallclock secs ( 5.08 usr +  0.03 sys =  5.11 CPU) @ 58.71/s (n=300)
     m_for:  9 wallclock secs ( 4.19 usr +  0.00 sys =  4.19 CPU) @ 71.60/s (n=300)
   m_for_M:  8 wallclock secs ( 4.10 usr +  0.00 sys =  4.10 CPU) @ 73.17/s (n=300)
   m_while:  5 wallclock secs ( 2.26 usr +  0.02 sys =  2.28 CPU) @ 131.58/s (n=300)
 m_while_M:  5 wallclock secs ( 2.28 usr +  0.02 sys =  2.30 CPU) @ 130.43/s (n=300)
   s_index:  5 wallclock secs ( 2.13 usr +  0.00 sys =  2.13 CPU) @ 140.85/s (n=300)
        tr:  0 wallclock secs ( 0.27 usr +  0.00 sys =  0.27 CPU) @ 1111.11/s (n=300)
            (warning: too few iterations for a reliable count)
  while_re:  5 wallclock secs ( 2.11 usr +  0.00 sys =  2.11 CPU) @ 142.18/s (n=300)
 
=== check counts ===
         _while_re  6000
          _m_for_M  6000
        _m_array_M  6000
               _tr  6000
        _m_while_M  6000
          _m_while  6000
          _s_index  6000
            _m_for  6000
          _m_array  6000