[all-commits] [llvm/llvm-project] b2d3c3: [ctx_prof] Fix checks in `PGOCtxprofFlattening` (#...

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b2d3c315d510f55ac7ae0ca06f362c709fcacd12
      https://github.com/llvm/llvm-project/commit/b2d3c315d510f55ac7ae0ca06f362c709fcacd12
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2024-09-17 (Tue, 17 Sep 2024)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/PGOCtxProfFlattening.cpp
    A llvm/test/Analysis/CtxProfAnalysis/flatten-zero-path.ll
    M llvm/test/ThinLTO/X86/ctxprof.ll

  Log Message:
  -----------
  [ctx_prof] Fix checks in `PGOCtxprofFlattening` (#108467)

The assertion that all out-edges of a BB can't be 0 is incorrect: they
can be, if that branch is on a cold subgraph.

Added validators and asserts about the expected proprerties of the
propagated counters.



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