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.
Note the go compiler is actually fairly immature compared to C++ compilers. It does not have any AVX autovectorization. Any AVX optimization is manual assembly by a library author.
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.