[all-commits] [llvm/llvm-project] a79cf0: [MC][NFC] Use vector for GUIDProbeFunctionMap

[Amir Ayupov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a79cf0228e4ade1f69e8196fdcf9c0184b4ba1b7
      https://github.com/llvm/llvm-project/commit/a79cf0228e4ade1f69e8196fdcf9c0184b4ba1b7
  Author: Amir Ayupov <aaupov at fb.com>
  Date:   2024-08-26 (Mon, 26 Aug 2024)

  Changed paths:
    M bolt/lib/Rewrite/PseudoProbeRewriter.cpp
    M llvm/include/llvm/MC/MCPseudoProbe.h
    M llvm/lib/MC/MCPseudoProbe.cpp

  Log Message:
  -----------
  [MC][NFC] Use vector for GUIDProbeFunctionMap

Replace unordered_map with a vector. Pre-parse the section to statically
allocate storage. Use BumpPtrAllocator for FuncName strings, keep
StringRef in FuncDesc.

Reduces peak RSS of pseudo probe parsing from 9.08 GiB to 8.89 GiB as
part of perf2bolt with a large binary.

Test Plan:
```
bin/llvm-lit -sv test/tools/llvm-profgen
```

Reviewers: wlei-llvm, rafaelauler, dcci, maksfb, ayermolo

Reviewed By: wlei-llvm

Pull Request: https://github.com/llvm/llvm-project/pull/102905



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