[all-commits] [llvm/llvm-project] 79012f: [LowerTypeTests] Optimize buildBitSet (#157386)

[Vitaly Buka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 79012fcfd333040e517f82e235d114c3bc960a99
      https://github.com/llvm/llvm-project/commit/79012fcfd333040e517f82e235d114c3bc960a99
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2025-09-10 (Wed, 10 Sep 2025)

  Changed paths:
    M llvm/include/llvm/Transforms/IPO/LowerTypeTests.h
    M llvm/lib/Transforms/IPO/LowerTypeTests.cpp
    M llvm/unittests/Transforms/IPO/LowerTypeTests.cpp

  Log Message:
  -----------
  [LowerTypeTests] Optimize buildBitSet (#157386)

`buildBitSet` had a loop trough entire GlobalLayout to pickup matching
offsets.

The patch maps all offsets to correspondign
`TypeId`, so we pass prepared list of offsets into
`buildBitSet`.

On one large internal binary, `LowerTypeTests`
took 58% of ThinLTO link time before the patch.
After the patch just 7% (absolute saving is 200s).



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