Lua Local vs Global function simple banchmark

Lua Local vs Global function simple banchmark.lua

-- Time function from http://stackoverflow.com/questions/463101/lua-current-time-in-milliseconds

-------------------------------------------------------------
-- TEST A
-- Local Function

local function Add( val )
	return val + 1
end

local x = os.clock()
local s = 0
for i=1, 1000000 do 
	s = Add( s )
end

local result_a = os.clock() - x

print("TEST A; Local Function")
print(string.format("elapsed time: %.2f\n", result_a))

-------------------------------------------------------------
-- TEST B
-- Global Function

function AddB( val ) -- Function not local
	return val + 1
end

local time_b = os.clock()
local s = 0
for i=1, 1000000 do 
	s = AddB( s )
end

local result_b = os.clock() - time_b

print("TEST B: Global Function")
print(string.format("elapsed time: %.2f\n", result_b) )

-------------------------------------------------------------
-- TEST C
-- No Function

local time_c = os.clock()
local s = 0
for i=1, 1000000 do 
	s = s + 1
end

local result_c = os.clock() - time_c

print("TEST C: No Function")
print(string.format("elapsed time: %.2f\n", result_c) )