[llvm-dev] Using PGO and -O3

[Victor Leschuk via llvm-dev]

Maybe we should update the documentation to state this directly?
Currently its a little bit confusing.


On 01/29/2018 05:51 AM, Xinliang David Li wrote:
> It means using PGO with -O2 and above (including -O3).
>
> David
>
> On Sun, Jan 28, 2018 at 6:48 PM, Victor Leschuk via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>
>     Hello all,
>
>     clang-related PGO documentation recommends using PGO with -O2 (for
>     example:
>     https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization
>     <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
>
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>
>

-- 
Best Regards,

Victor Leschuk | Software Engineer | Access Softek

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