I’ve never seen fortran before. Wow, that looks more readable than a lot of modern languages.
It’s a fairly nice language. You can probably get better performance out of C/C++ with unlimited effort. But, it is really nice for allowing computational scientists to get, like, 95% of the way there.
I think it actually suffers from the reputation as this ancient/super hardcore performance language. The name comes from “Formula Translating System,” which implies… it was written for people who speak human languages first!
MKL is Intel’s famous numerical library (it includes things like BLAS “basic linear algebra subroutines” and fast Fourier transforms). It is availible for free, but IIRC they had some support plans maybe, maybe that’s what you are remembering?
It is closed source, but you can look at the source of the best open source competitor libflame/BLIS, and see that most of the performance comes from C and assembly.
It is difficult to beat “unlimited effort” C, but not many program really justify that treatment.
In Fortran, arrays are not allowed to overlap which allows some optimisations. c has rules in the spec about how memory accesses must occur, and overlapping arrays being possible prevents some compiler optimisations. The restrict keyword is you promising that the memory at some pointer won't be accessed through another pointer.
You can compare two implementations in Fortran/c using godbolt to see how each of them compile.
the fortran library we only had one license on a physical machine, i had to travel for one extensive recompilation of that side lol! it wasnt the library mentioned below, i would have to ask a collegue.
Old school Fortran from before they added cleaner and more structured elements is terrifying.