constants_vs_inline.cr

require "benchmark"

RANGE = 3..7

a = 1
v = ARGV[0].to_i

Benchmark.ips do |x|
  x.report("constant") do
    case v
    when RANGE
      a &+= 1
    end
  end
  x.report("inline") do
    case v
    when 3..7
      a &+= 1
    end
  end
  x.report("manual") do
    if 3 <= v <= 7
      a &+= 1
    end
  end
end

puts a


# Results

## Current compiler
# constant 291.75M (  3.43ns) (± 8.16%)  0.0B/op   2.66× slower
#   inline 769.21M (  1.30ns) (± 6.62%)  0.0B/op   1.01× slower
#   manual 777.14M (  1.29ns) (± 7.07%)  0.0B/op        fastest

## Next compiler
# constant 605.09M (  1.65ns) (± 4.55%)  0.0B/op   1.15× slower
#   inline 697.44M (  1.43ns) (± 5.34%)  0.0B/op        fastest
#   manual 601.71M (  1.66ns) (± 5.20%)  0.0B/op   1.16× slower