[all-commits] [llvm/llvm-project] dc85d5: [CGData][ThinLTO] Global Outlining with Two-CodeGe...

[Kyungwoo Lee via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dc85d5263ed5e416cb4ddf405611472f4ef12fd3
      https://github.com/llvm/llvm-project/commit/dc85d5263ed5e416cb4ddf405611472f4ef12fd3
  Author: Kyungwoo Lee <kyulee at meta.com>
  Date:   2024-10-09 (Wed, 09 Oct 2024)

  Changed paths:
    M clang/lib/CodeGen/BackendUtil.cpp
    M llvm/include/llvm/CGData/CodeGenData.h
    M llvm/include/llvm/CGData/CodeGenDataReader.h
    M llvm/include/llvm/LTO/LTO.h
    M llvm/include/llvm/LTO/LTOBackend.h
    M llvm/lib/CGData/CMakeLists.txt
    M llvm/lib/CGData/CodeGenData.cpp
    M llvm/lib/CGData/CodeGenDataReader.cpp
    M llvm/lib/LTO/CMakeLists.txt
    M llvm/lib/LTO/LTO.cpp
    M llvm/lib/LTO/LTOBackend.cpp
    A llvm/test/ThinLTO/AArch64/cgdata-two-rounds-caching.ll
    A llvm/test/ThinLTO/AArch64/cgdata-two-rounds.ll
    A llvm/test/ThinLTO/AArch64/lit.local.cfg

  Log Message:
  -----------
  [CGData][ThinLTO] Global Outlining with Two-CodeGen Rounds (#90933)

This feature is enabled by `-codegen-data-thinlto-two-rounds`, which
effectively runs the `-codegen-data-generate` and `-codegen-data-use` in
two rounds to enable global outlining with ThinLTO.
1. The first round: Run both optimization + codegen with a scratch
output.
Before running codegen, we serialize the optimized bitcode modules to a
temporary path.
 2. From the scratch object files, we merge them into the codegen data.
3. The second round: Read the optimized bitcode modules and start the
codegen only this time.
Using the codegen data, the machine outliner effectively performs the
global outlining.
 
Depends on #90934, #110461 and  #110463.
This is a patch for
https://discourse.llvm.org/t/rfc-enhanced-machine-outliner-part-2-thinlto-nolto/78753.



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