[PATCH] D131306: [llvm][misexpect] Track provenance of branch weights

[Paul Kirth via Phabricator via cfe-commits]

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MisExpect needs to know if a branch weight intrinsic originates from an
llvm.expect intrinsic.

This patch allows us to track that provenance by adding a new
metadata type that can be moved in concert with the existing branch
weights. The new metadata is copied whenever branch weights are copied,
and is removed when new branch weights are added.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131306

Files:
  clang/test/CodeGenCXX/attr-likelihood-if-branch-weights.cpp
  clang/test/CodeGenCXX/attr-likelihood-if-vs-builtin-expect.cpp
  llvm/include/llvm/IR/FixedMetadataKinds.def
  llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
  llvm/lib/Transforms/IPO/Attributor.cpp
  llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
  llvm/lib/Transforms/IPO/LowerTypeTests.cpp
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
  llvm/lib/Transforms/Utils/Local.cpp
  llvm/lib/Transforms/Utils/MisExpect.cpp
  llvm/test/Transforms/LowerExpectIntrinsic/basic.ll
  llvm/test/Transforms/LowerExpectIntrinsic/expect-with-probability.ll

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