[all-commits] [llvm/llvm-project] 07d86d: [ctxprof] Flat profile collection (#130655)

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 07d86d25c9bca0ae4ee5999f8215a5375f56ef5f
      https://github.com/llvm/llvm-project/commit/07d86d25c9bca0ae4ee5999f8215a5375f56ef5f
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2025-03-12 (Wed, 12 Mar 2025)

  Changed paths:
    M compiler-rt/lib/ctx_profile/CtxInstrContextNode.h
    M compiler-rt/lib/ctx_profile/CtxInstrProfiling.cpp
    M compiler-rt/lib/ctx_profile/CtxInstrProfiling.h
    M compiler-rt/lib/ctx_profile/tests/CtxInstrProfilingTest.cpp
    M compiler-rt/test/ctx_profile/TestCases/generate-context.cpp
    M llvm/include/llvm/ProfileData/CtxInstrContextNode.h
    M llvm/include/llvm/ProfileData/PGOCtxProfWriter.h
    M llvm/lib/Transforms/Instrumentation/PGOCtxProfLowering.cpp
    M llvm/test/Transforms/PGOProfile/ctx-instrumentation.ll

  Log Message:
  -----------
  [ctxprof] Flat profile collection (#130655)

Collect flat profiles. We only do this for function activations that aren't otherwise collectible under a context root are encountered. 

This allows us to reason about the full profile without concerning ourselves wether we are double-counting. For example we can combine (during profile use) flattened contextual profiles with flat profiles.



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