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 https://github.com

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 https://github.com/google/autofdo and https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization https://clang.llvm.org/docs/UsersManual.html#profile-guided-.... (People within Google say "FDO", basically everyone else says "PGO".)