[libcxx-commits] [PATCH] D141205: [libcxx] nth_element use introselect to avoid quadratic behavior

[Zhikai Zeng via Phabricator via libcxx-commits]

Backl1ght created this revision.
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Current implementation of nth_element will be quadratic under some cases, use introselect to avoid quadratic behavior.

I also add a benchmark for nth_element.

related issue https://github.com/llvm/llvm-project/issues/52747


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141205

Files:
  libcxx/benchmarks/CMakeLists.txt
  libcxx/benchmarks/algorithms/common.h
  libcxx/benchmarks/algorithms/nth_element.bench.cpp
  libcxx/include/__algorithm/nth_element.h
  libcxx/include/__algorithm/sort.h

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