[llvm-dev] Using PGO and -O3

Victor Leschuk via llvm-dev llvm-dev at lists.llvm.org
Sun Jan 28 18:48:26 PST 2018

Hello all,

clang-related PGO documentation recommends using PGO with -O2 (for
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

More information about the llvm-dev mailing list