[cfe-dev] Clang PGO and LLVM PGO commandline interface

[Pirama Arumuga Nainar via cfe-dev]

https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization is
the documentation for Clang's PGO.  It doesn't explicitly state which flags
map to frontend and IR-based instrumentation.

* -fprofile-generate and -fprofile-use are for IR-based instrumentation and
profile use.
* -fprofile-instr-generate and -fprofile-instr-use are for frontend-based
instrumentation and profile use.
* -fprofile-sample-use is to use sparse profiles from
hardware-counter-based profiles.



On Wed, Dec 27, 2017 at 2:37 PM, Johan Engelen via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hello all,
>   A while ago, I implemented frontend-based PGO in LDC (very similar to
> Clang's) and now I'd like to add IR-based PGO. I want the commandline
> interface to be the same (or very similar) to Clang's, but I am having
> trouble finding the current state of Clang's PGO commandline flags (and
> their meaning related to Clang/LLVM-IR PGO).
>
> Can you give me a pointer to where I can find this, or perhaps give me a
> brief overview of the current flags and how to select whether to use
> frontend-based or IR-based PGO ?
>
> Thanks a lot,
>   Johan
>
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