[julia-users] Code slower if not enclosed in a function?

[David Smith]

This code runs in 0.5 sec in v0.3.2, but takes 0.64 s in v0.4:
tic() 
N = 256 
n = 80 
x = rand(N,N) + 1im*randn(N,N) 
f = zeros(Complex128, N, N, n) 
for t = 1:n 
    f[:,:,t] = fft(x + float(t)) 
end 
toc()

If I enclose it in a function, as in the following, and then run it by 
calling the function, it runs in 0.3 s in both v0.3.2 and v0.4.
function bench()
    tic() 
    N = 256 
    n = 80 
    x = rand(N,N) + 1im*randn(N,N) 
    f = zeros(Complex128, N, N, n) 
    for t = 1:n 
        f[:,:,t] = fft(x + float(t)) 
    end 
    toc()
end
bench()


What is going on?