[PATCH] D62478: [LV] Wrap LV illegality reporting in a function. NFC.

[Pavel Samolysov via Phabricator via llvm-commits]

psamolysov created this revision.
psamolysov added reviewers: hsaito, fhahn.
psamolysov added a project: LLVM.
Herald added subscribers: rkruppe, hiraditya.

  A function for loop vectorization illegality reporting has been
  introduced:
  
  ```
  void LoopVectorizationLegality::reportVectorizationFailure(
      const StringRef DebugMsg, const StringRef OREMsg,
      const StringRef ORETag, Instruction * const I) const;
  ```
  
  The function prints a debug message when the debug for the compilation
  unit is enabled as well as invokes the optimization report emitter to
  generate a message with a specified tag. The function doesn't cover any
  complicated logic when a custom lambda should be passed to the emitter,
  only generating a message with a tag is supported.
  
  The function always prints the instruction `I` after the debug message
  whenever the instruction is specified, otherwise the debug message
  ends with a dot: 'LV: Not vectorizing: Disabled/already vectorized.'

The idea was present by @hsaito. The patch depends on D62311 <https://reviews.llvm.org/D62311> and should be land after D62311 <https://reviews.llvm.org/D62311> is applied.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D62478

Files:
  llvm/include/llvm/Transforms/Vectorize/LoopVectorizationLegality.h
  llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp

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