bitwise_operators_in_ruby.rb

require 'benchmark'
require 'benchmark/ips'

seed = 1239012

Benchmark.ips do |x|
  x.report('bitwise multiplication by 2') { seed << 1 }
  x.report('arithmetic multiplication by 2') { seed * 2 }

  x.report('bitwise division by 2') { seed >> 1 }
  x.report('arithmetic division by 2') { seed / 2 }

  x.report('bitwise even') { seed & 1 == 1 }
  x.report('arithmetic even') { seed % 2 == 1 }
end

output.txt

Calculating -------------------------------------
bitwise multiplication by 2     169.075k i/100ms
arithmetic multiplication by 2  174.182k i/100ms
bitwise division by 2           172.457k i/100ms
arithmetic division by 2        176.047k i/100ms
         bitwise even           171.047k i/100ms
         arithmetic even        174.381k i/100ms
-------------------------------------------------
bitwise multiplication by 2     10.121M (± 1.1%) i/s -     50.722M
arithmetic multiplication by 2  10.888M (± 1.4%) i/s -     54.519M
binary division by 2            10.051M (± 1.9%) i/s -     50.357M
arithmetic division by 2        10.364M (± 3.3%) i/s -     51.758M
         binary even            9.601M (± 2.0%) i/s -     48.064M
         arithmetic even        10.180M (± 1.7%) i/s -     50.919M