I'll take your word for it; I haven't worked in that field. I do still think it would interesting to see a comparative benchmark though. I know the Go compiler

I'll take your word for it; I haven't worked in that field. I do still think it would interesting to see a comparative benchmark though. I know the Go compiler tries to use AVX and friends where available. I doubt it will ever beat a competent programmer using OpenMP to vectorize though (though Goroutnes might be competitive for plain multithreading). A relevant consideration too -- OpenMP seems to be moving in the direction of supporting various kinds of accelerators in addition to CPUs*, so your C++ code has a better change of being performance-portable to an accelerator if you need it.