Benchmark for math.countBits using nimbench

countbitsbench.nim

import nimbench
from math import countBits

bench(countBits8, m):
  var x = 0
  for i in 1..m:
    x += countBits(uint8(i))
  doNotOptimizeAway(x)

bench(countBits16, m):
  var x = 0
  for i in 1..m:
    x += countBits(uint16(i))
  doNotOptimizeAway(x)

bench(countBits32, m):
  var x = 0
  for i in 1..m:
    x += countBits(uint32(i))
  doNotOptimizeAway(x)

bench(countBits64, m):
  var x = 0
  for i in 1..m:
    x += countBits(uint64(i))
  doNotOptimizeAway(x)

runBenchmarks()