[PATCH] D159322: LoopVectorize: Set branch_weight for conditional branches

[Matthias Braun via Phabricator via llvm-commits]

MatzeB created this revision.
MatzeB added reviewers: davidxl, wenlei, hoy, mtrofin, paulkirth, xur, fhahn.
Herald added subscribers: artagnon, shiva0217, sunshaoce, StephenFan, modimo, hiraditya, mcrosier.
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Consistently add `branch_weights` metadata in any condition branch created from `LoopVectorize.cpp`:

- Will only add metadata if the original loop-latch branch had metadata assigned.
- Most checks should rarely trigger so I am using a 127:1 ratio.
- For the middle block we assume an equal distribution of modulo results.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D159322

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Transforms/LoopVectorize/branch-weights.ll
  llvm/test/Transforms/LoopVectorize/first-order-recurrence.ll

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