[all-commits] [llvm/llvm-project] 4c90d9: [ctxprof] Use the flattened contextual profile pre...

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c90d977dbdcfed3c25e85472b61cc17eef915c0
      https://github.com/llvm/llvm-project/commit/4c90d977dbdcfed3c25e85472b61cc17eef915c0
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2025-04-08 (Tue, 08 Apr 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/CtxProfAnalysis.h
    M llvm/include/llvm/Analysis/ProfileSummaryInfo.h
    M llvm/include/llvm/Transforms/Instrumentation/PGOCtxProfFlattening.h
    M llvm/lib/Analysis/CtxProfAnalysis.cpp
    M llvm/lib/Analysis/ProfileSummaryInfo.cpp
    M llvm/lib/Passes/PassBuilderPipelines.cpp
    M llvm/lib/Passes/PassRegistry.def
    M llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
    M llvm/test/Analysis/CtxProfAnalysis/flatten-and-annotate.ll
    M llvm/test/Analysis/CtxProfAnalysis/flatten-check-path.ll
    M llvm/test/Analysis/CtxProfAnalysis/flatten-zero-path.ll
    R llvm/test/Transforms/PGOProfile/ctx-prof-use-prelink.ll

  Log Message:
  -----------
  [ctxprof] Use the flattened contextual profile pre-thinlink (#134723)

Flatten the profile pre-thinlink so that ThinLTO has something to work with for the parts of the binary that aren't covered by contextual profiles. Post-thinlink, the flattener is re-run and will actually change profile info, but just for the modules containing contextual trees ("specialized modules"). For the rest, the flattener just yanks out the instrumentation.



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