[PATCH] D118177: [llvm-profgen] Decouple artificial branch from LBR parser and fix external address related issues

[Lei Wang via Phabricator via llvm-commits]

wlei added a comment.

As we discussed offline, noted the summary here:

The data shows we the interrupt or standalone LBR pattern does exist, we should handle it(clear the call stack and keep unwinding).

Now we don’t choose to rely on detecting this LBR based on its type(call, return, jmp), we will leverage checking in `linearUnwind`, because a standalone LBR, no matter its type, since it doesn’t have other part to pair, it will eventually cause a wrong linear range, like [external, internal], [internal, external]. Then set the state to invalid there, this should make the code cleaner.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D118177/new/

https://reviews.llvm.org/D118177