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Still have some compilation time #26

@gitboy16

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@gitboy16

Hi,
It seems as PrecompileTools does not "work" in the following case. By that I mean that compilatiin still hqppen before running the function. Please see below:

module MSort

using PrecompileTools

function quicksort(
    v::Vector{T};
    lo::Int = 1,
    hi::Int = length(v),
) where {T <: Union{Int64, Float64}}
    x = copy(v) 
    quick!(x, lo, hi)
    x
end

function partition(
    xp::Vector{T},
    pivot::T,
    left::Int,
    right::Int,
) where {T <: Union{Int64, Float64}}
    while left <= right
        while xp[left] < pivot
            left += 1
        end
        while pivot < xp[right]
            right -= 1
        end
        if left <= right
            xp[left], xp[right] = xp[right], xp[left]
            left += 1
            right -= 1
        end
    end
    left, right
end

function quick!(
    xp::Vector{T},
    i::Int,
    j::Int,
) where {T <: Union{Int64, Float64}}
    if j > i
        left, right = partition(xp, xp[(j+i)>>>1], i, j)
        quick!(xp, i, right)
        quick!(xp, left, j)
    end
end

@setup_workload begin 
    @compile_workload begin
        quicksort(rand(64))
    end
end

end

x = rand(64); @time Msort.quicksort(x);
# 0.004929 seconds (29 allocations: 2.047 KiB, 99.56% compilation time)

However if I replace Vector{T} by Vector{Float64}, and remove all T in the code, then it works.

Is that expected that compilation happen in the first version ?
If yes, could we have PrecompileTools work with parametric type? If no, I suppose it is a bug?

Thank you

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