sample and result of @inline macro

inline.jl

#=
These sample functions are taken from https://github.com/JuliaLang/julia/pull/8297
=#

function f(x)
  y = x+5
  z = y*y
  q = z/y
  m = q-3
end

@inline function f_inlined(x)
  y = x+5
  z = y*y
  q = z/y
  m = q-3
end

g(x) = f(2x)
g_inlined(x) = f_inlined(2x)



gc_disable()

# JIT compile
x = 0
f(x)
f_inlined(x)
g(x)
g_inlined(x)

N = 1 << 20
@show N

println()

println("f(x)")
@time for i in 1:N
  x = f(x)
end

println()
x = 0
println("f_inlined(x)")
@time for i in 1:N
  x = f_inlined(x)
end

println()

println("g(x) = f(2x)")
@time for i in 1:N
  x = g(x)
end

println()
x = 0
println("g_inlined(x) = f_inlined(2x)")
@time for i in 1:N
  x = g_inlined(x)
end

println()
x = 0
println("not function")
@time for i in 1:N
  y = x+5
  z = y*y
  q = z/y
  m = q-3
end

result.dat

$ julia -E 'versioninfo()'
Julia Version 0.4.0-dev+1903
Commit 6b0fcce* (2014-11-30 18:08 UTC)
Platform Info:
  System: Darwin (x86_64-apple-darwin13.4.0)
  CPU: Intel(R) Core(TM) i5-4288U CPU @ 2.60GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3


$ julia inline.jl
N = 1048576

f(x)
elapsed time: 0.181024115 seconds (83911928 bytes allocated)

f_inlined(x)
elapsed time: 0.45793796 seconds (134205080 bytes allocated)

g(x) = f(2x)
elapsed time: 0.405215525 seconds (100649072 bytes allocated)

g_inlined(x) = f_inlined(2x)
elapsed time: 0.181524273 seconds (83937752 bytes allocated)

not function
elapsed time: 0.277514884 seconds (100646984 bytes allocated)
(