[all-commits] [llvm/llvm-project] a78b19: [IR] Use SmallSet with more inline elements in dro...

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a78b19d8ea513a2e88fa431b549b65406384a12d
      https://github.com/llvm/llvm-project/commit/a78b19d8ea513a2e88fa431b549b65406384a12d
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-07-15 (Mon, 15 Jul 2024)

  Changed paths:
    M llvm/lib/IR/Metadata.cpp

  Log Message:
  -----------
  [IR] Use SmallSet with more inline elements in dropUnknownNonDebugMetadata (NFC) (#98853)

SmallSet here often ends up allocating memory via std::set inside
SmallSet because KnownIDs.size() goes up to 17 on an x86 host.  This
patch switches to SmallSet<unsigned, 32> to avoid memory
allocations.

The increased inline elements here save 0.57% of heap allocations during
the compilation of X86ISelLowering.cpp.ii, a preprocessed version of
X86ISelLowering.cpp.



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