def do_math(a : Vector(Type, Size), b : Vector(Type, Size))
  @elements.each_index do |i|
    @elements[i] = yield a[i], b[i]
  end
end

def do_unrolled_math(a : Vector(Type, Size), b : Vector(Type, Size))
  @elements[0] = yield a[0], b[0]
  @elements[1] = yield a[1], b[1]
end

Benchmark.ips do |x|
  x.report("loop") { res.do_math(foo, bar) { |a, b| a + b } }
  x.report("unrolled") { res.do_unrolled_math(foo, bar) { |a, b| a + b } }
end