[cfe-dev] Using PGO and -O3

[Victor Leschuk via cfe-dev]

Hello all,

clang-related PGO documentation recommends using PGO with -O2 (for
example:
https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization).
The question is: is there any reason why exactly -O2 is used in
examples? Are there any factors which can cause problems when using PGO
with -O3?

Thanks in advance for your advice!

-- 
Best Regards,

Victor Leschuk | Software Engineer | Access Softek