gistfile1.txt

#!/usr/bin/env ruby
#
# output
#
#  17.340000   0.000000  17.340000 ( 17.346691)
#  18.380000   0.000000  18.380000 ( 18.388277)
#
require 'benchmark'

def bitmask
  2 ** 32 - 1
end

def bitmask_with_assignment
  overshoot = 2 ** 32
  overshoot - 1
end

iterations = 10_000_000

iterations.times { b = bitmask }
puts Benchmark.measure { iterations.times { b = bitmask } }
iterations.times { b = bitmask_with_assignment }
puts Benchmark.measure { iterations.times { b = bitmask_with_assignment } }