Microbenchmark for LuaJIT's modulo operations

modulo.lua

local C = ffi.C

function fold(fn, times)
   local now = os.clock()
   for i=1,times do
      fn()
   end
   return os.clock() - now
end

print("math.fmod: "..fold(function() return math.fmod(255, 8) end, 10000000))
print("%: "..fold(function() return 255 % 8 end, 10000000))
print("&: "..fold(function() return bit.band(255, 7) end, 10000000))

Example of execution:

$ luajit modulo.lua
math.fmod: 0.243867
%: 0.003274
&: 0.003262