Yes, it is required for all functions to be inlined in Julia. Note that Julia 1.8 and newer supports callsite inlining, so you can, for example, do `@inline exp

Yes, it is required for all functions to be inlined in Julia. Note that Julia 1.8 and newer supports callsite inlining, so you can, for example, do `@inline exp(x[i])` inside your `for` loop, and this will cause `exp` to get inlined there, and should enable vectorization. For functions like `log` or `sin`, this is not enough, but you could try `@turbo` from LoopVectorization.jl, which supports these and some others. `@simd ivdep` may be needed when you have indirect indexing. Do not forget the `ivdep`, but only if you know it is actually safe. This can lead to hard to track down bugs if it is not.