Problem is, you have to take care to look at the compiler output and compare it to your expectations. Maybe fiddle with it a bit until it matches what you would have written yourself. Usually, it is quicker to just write it yourself...
> Problem is, you have to take care to look at the compiler output and compare it to your expectations. Maybe fiddle with it a bit until it matches what you would have written yourself.
And keep redoing that for every new compiler or version of a compiler, or if you change compile options. Any of those things can prevent the auto-vectorization.
