[all-commits] [llvm/llvm-project] 6a3e5f: [ctxprof] Only prune the profile in modules contai...

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6a3e5f89bb89548fb39ca241c8ed7c2005a190f1
      https://github.com/llvm/llvm-project/commit/6a3e5f89bb89548fb39ca241c8ed7c2005a190f1
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2025-04-07 (Mon, 07 Apr 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/CtxProfAnalysis.h
    M llvm/lib/Analysis/CtxProfAnalysis.cpp
    M llvm/lib/Transforms/IPO/ElimAvailExtern.cpp
    M llvm/test/Analysis/CtxProfAnalysis/load.ll
    A llvm/test/Analysis/CtxProfAnalysis/pruning.ll
    M llvm/test/Transforms/EliminateAvailableExternally/transform-to-local.ll

  Log Message:
  -----------
  [ctxprof] Only prune the profile in modules containing only context trees (#134340)

We will subsequently treat the whole profile as "flat" in the frontend, (i.e flatten and combine with the flat profile section), so we can have a profile for ThinLTO for parts of the application that don't come under the contextual profile. After ThinLTO, we will treat the module(s) containing contextual trees differently: they'll have only the contextual profile pertinent to them. The rest of the modules (non-contextual) will proceed "as usual", off the flattened profile.

This patch implements pruning of the contextual profile to enable the above.



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