On: {n} times faster than C

[ftxbro]

Thank you this is an amazingly comprehensive answer! Now I wonder what would be the workflow for using these compiler features. Like if I am a normal or bad C programmer and I write my program and use valgrind to check that it doesn't have obvious problems and I compile it with -march native or whatever, then I can add some step to the workflow to somehow re-compile it in a way that uses the branching or access patterns of some examples that I let it process for that purpose?

[tylerhou → ftxbro]

Yes, Clang supports FDO, but it might be hard to set up (I've never set up FDO myself). You could check out https://github.com/google/autofdo and https://clang.llvm.org/docs/UsersManual.html#profile-guided-....

(People within Google say "FDO", basically everyone else says "PGO".)