gistfile1.txt

@compiler_plugin FastSinPlugin

#=
Some sort of implementation of FastSinPlugin where
sin(x::Float64) is replaced by fast_sin(x::Float64).

N.B.: If the function being called is not `sin`, this
needs to recurse.
N.B.: This needs to handle the non-inferred case
N.B.: This should be done in the optimizer and may assume
that inference results are not invalidated. A separate plugin
should be able to replace method tables and simply return the
method for sin(::Float64) by the method for fast_sin(::Float64),
but that's a separate case
N.B.: This may share inference caches with regular inference,
but may not share optimized code caches.
=#

let counter = 0
	global fast_sin, counter
	fast_sin(x::Float64) = (counter += 1; sin(x::Float64))
	get_fast_sin_counter() = counter
	reset_counter() = (counter = 0)
end

get_sin() = sin

function my_func(x)
	reset_counter()
	sin(x)
	@test get_fast_sin_counter() == 1
	get_sin()(x)
	@test get_fast_sin_counter() == 2
	get_sin()(Base.inferencebarrier(x))
	@test get_fast_sin_counter() == 3
end

with(FastSinPlugin) do
	my_func(1.0)
end