[PATCH] D146776: [llvm] Preliminary fat-lto-objects support

[Paul Kirth via Phabricator via llvm-commits]

paulkirth updated this revision to Diff 517705.
paulkirth added a comment.

Use separate modules and pipelies to optimize the bitcode and asembly sections.

- The EmbedBitcodePass (which maybe should be renamed now...) was updated to clone the current module and run a separate pipeline on the clone.
- The cloned module is then used to generate the `.llvm.tlo` bitcode section and discarded.
- The EmbedBitcodePass is initialized in the FatLTO pipeline with the corect pre-link LTO pipeline.
- The FatLTO pipeline now only runs the EmbedBitcodePass and then the `PerModuleDefaultPipeline`.
- The MPM used to optimize the cloned module is generated from the same pass builder as the defautl pipeline, so there shouldn't be any difference in configuration.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146776/new/

https://reviews.llvm.org/D146776

Files:
  llvm/docs/FatLTOSupport.rst
  llvm/docs/ReleaseNotes.rst
  llvm/docs/UserGuides.rst
  llvm/include/llvm/Bitcode/EmbedBitcodePass.h
  llvm/include/llvm/Passes/PassBuilder.h
  llvm/lib/Bitcode/Writer/CMakeLists.txt
  llvm/lib/Bitcode/Writer/EmbedBitcodePass.cpp
  llvm/lib/Object/ObjectFile.cpp
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassBuilderPipelines.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/test/Bitcode/embed-multiple.ll
  llvm/test/Bitcode/embed-unsupported-object-format.ll
  llvm/test/Bitcode/embed.ll

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