[PATCH] D110908: [NPM] Automatic 'opt' pipeline reducer script.

[Markus Lavin via Phabricator via llvm-commits]

markus created this revision.
markus added reviewers: aeubanks, bjope.
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  Script for automatic 'opt' pipeline reduction for when using the new
  pass-manager (NPM). Based around the '-print-pipeline-passes' option.
  
  The reduction algorithm consists of several phases (steps).
  
  Step #0: Verify that input fails with the given pipeline and make note of the
  error code.
  
  Step #1: Split pipeline in two starting from front and move forward as long as
  first pipeline exits normally and the second pipeline fails with the expected
  error code. Move on to step #2 with the IR from the split point and the
  pipeline from the second invocation.
  
  Step #2: Remove passes from end of the pipeline as long as the pipeline fails
  with the expected error code.
  
  Step #3: Make several sweeps over the remaining pipeline trying to remove one
  pass at a time. Repeat sweeps until unable to remove any more passes.
  
  Usage example:
  ./tmp/reduce_pipeline.py --opt-binary=./build-all-Debug/bin/opt --input=input.ll --output=output.ll --passes=PIPELINE [EXTRA-OPT-ARGS ...]


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110908

Files:
  llvm/utils/pipeline.py
  llvm/utils/reduce_pipeline.py

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