[PATCH] D125226: [pseudo] Add benchmarks for pseudoparser.

[Haojian Wu via Phabricator via cfe-commits]

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Running on SemaDecl.cpp with the cxx.bnf grammar:

  ----------------------------------------------------------
  Benchmark                Time             CPU   Iterations
  ----------------------------------------------------------
  runParseGrammar     643714 ns       643704 ns         1025
  runLRBuild        34511806 ns     34510526 ns           20
  runGLRParse      296809984 ns    296808745 ns            2 bytes_per_second=2.45822M/s


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125226

Files:
  clang-tools-extra/pseudo/CMakeLists.txt
  clang-tools-extra/pseudo/benchmarks/Benchmark.cpp
  clang-tools-extra/pseudo/benchmarks/CMakeLists.txt

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