minglotus-6 wrote:

> After this patch, follow up with a patch documenting raw and index format. 
> This has long being requested by many in the community.

Sure, I'm working on an `rst` doc and would like to focus on the PGO profile 
format (while compiler-rt infrastructure supports other use cases, like 
coverage instrumentation, etc), for example, how profile-data control structure 
references counters and value profiles.

I just updated this pull request (fix clang-format after using the same 
clang-format as bot, etc). @amharc and I discussed how to work around possible 
profile version skews without waiting for version compatibility full-fledged 
solution, and he suggested we could first teach profile reader to understand 
new sections without bumping the version and let it soak everywhere (e.g, for a 
few weeks), and increase the version number as a second change. I'm planning to 
make some progress on this aspect.

https://github.com/llvm/llvm-project/pull/66825
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