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Specialize to the global environment #910

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TurkeyMcMac wants to merge 1 commit into LuaJIT:v2.1 from TurkeyMcMac:globalspec

TurkeyMcMac commented Nov 14, 2022

This lets different functions in the same trace share global lookup code. Example code:

function g(n)
	return math.floor(n)
end

function f(n)
	return (g(math.ceil(n - 1.5)))
end

function bench()
	local s = 0
	local before = os.clock()
	for i = 1, 100000000 do
		s = s + f(i)
	end
	local after = os.clock()
	print(after - before, s)
end
jit.off(bench)

bench()

Without the patch, the benchmark time is about 3.6 on my computer. With the patch, the benchmark time is about 2.9.


          Specialize to the global environment

0c70d3d

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