[llvm-dev] PGO optimization using llvm

[Priyanka Bose via llvm-dev]

Hi,



We are using clang based compiler for our android build system.

We plan to enable the PGO (profile guided optimization ) for some of our
android modules



I would like to have some understanding on the way that the PGO profiles
are being used by the clang compiler.

As I understand Profile guidance enables the compiler to make better
optimization decisions by using knowledge about how the program actually
runs.

With this profile information, the compiler can do a better job of inlining
functions, ordering basic blocks, allocating registers, and so on.



So I would like to know if the clang based compiler in android will use
these profiles for making better decisions on inlining or register
allocations ?



But when I went through the clang documentation, right now the pgo profiles
can be used for block reordering but could not find reference as to whether
it helps the compiler

to take any other optimized decision .

https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization



Can you please help me to get this information if it’s something that clang
has yet to support with regards to PGO generated profiles.



Best Regards

Priyanka
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