require "benchmark"

struct Slice
  def new_reverse!
    check_writable

    p = @pointer
    q = @pointer + size - 1

    while p < q
      p.value, q.value = q.value, p.value
      p += 1
      q -= 1
    end

    self
  end
end

bytes = Bytes[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]

Benchmark.ips do |x|
  x.report("old") do
    bytes.reverse!
  end
  x.report("new") do
    bytes.new_reverse!
  end
end