@inbounds function inc!(l::Vector{UInt8}, n, i = length(l)-1)
if i > 0
l[i] += n
if l[i] > 0x39 # '9'
l[i] -= 0x0A # 10
inc!(l, 0x01, i-1)
end
else
pushfirst!(l, 0x31) # '1'
end
return nothing
end
function main(maxi = typemax(Int), N = 2^16)
io = IOBuffer(; sizehint=N)
a = UInt8['1', '\n']
sizehint!(a, 100)
for j in 1:N:maxi
s = take!(io)
write(stdout, s)
l = ll = 0
while ll+l+8 < N
l = 0
l += write(io, a)
inc!(a, 0x01)
l += write(io, a)
l += write(io, "Fizz\n")
inc!(a, 0x02)
l += write(io, a)
l += write(io, "Buzz\nFizz\n")
inc!(a, 0x03)
l += write(io, a)
inc!(a, 0x01)
l += write(io, a)
l += write(io, "Fizz\nBuzz\n")
inc!(a, 0x03)
l += write(io, a)
l += write(io, "Fizz\n")
inc!(a, 0x02)
l += write(io, a)
inc!(a, 0x01)
l += write(io, a)
l += write(io, "FizzBuzz\n")
inc!(a, 0x02)
ll += l
end
end
end
main()
The buffer of size N is optimized for my machine. I get about 350-400 MiB/s in WSL, it might be better on a real Linux machine (let's not talk about the performance in windows). I got slightly better results with julia 1.7 than with 1.6.
Try it online!
