require "benchmark"

Benchmark.ips(warmup: 4, calculation: 10) do |x|

  buffer = MemoryIO.new(2048)
  buffer << "DaTA"*512
  slice = buffer.to_slice
  count = 2048
  mask = [1_u8,2_u8,3_u8,4_u8]

  x.report("mask_offset & 0b11") do
    mask_offset = 0

    count.times do |i|
       slice[i] ^= mask[mask_offset & 0b11]
       mask_offset += 1
     end
  end

  x.report("mask_offset % 4") do
    mask_offset = 0

    count.times do |i|
       slice[i] ^= mask[mask_offset % 4]
       mask_offset += 1
     end
  end
end