[all-commits] [llvm/llvm-project] c9260e: [CodeLayout] Do not rebuild chains with -apply-ext...

[Ellis Hoag via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c9260e21d092c3acbb77bb9f6fcd0820f6a138c1
      https://github.com/llvm/llvm-project/commit/c9260e21d092c3acbb77bb9f6fcd0820f6a138c1
  Author: Ellis Hoag <ellis.sparky.hoag at gmail.com>
  Date:   2024-11-18 (Mon, 18 Nov 2024)

  Changed paths:
    M llvm/lib/CodeGen/MachineBlockPlacement.cpp

  Log Message:
  -----------
  [CodeLayout] Do not rebuild chains with -apply-ext-tsp-for-size (#115934)

https://github.com/llvm/llvm-project/pull/109711 disables
`buildCFGChains()` when `-apply-ext-tsp-for-size` is used to improve
codesize. Tail merging can change the layout and normally requires
`buildCFGChains()` to be called again, but we want to prevent this when
optimizing for codesize. We saw slight size improvement on large
binaries with this change. If `-apply-ext-tsp-for-size` is not used,
this should be a NFC.



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