[all-commits] [llvm/llvm-project] 29312d: [libc++] Optimize char_traits a bit (#72799)

Nikolas Klauser via All-commits all-commits at lists.llvm.org
Sat Apr 20 02:40:39 PDT 2024


  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 29312d39ff89b664138c497716dd11d4e1f2876b
      https://github.com/llvm/llvm-project/commit/29312d39ff89b664138c497716dd11d4e1f2876b
  Author: Nikolas Klauser <nikolasklauser at berlin.de>
  Date:   2024-04-20 (Sat, 20 Apr 2024)

  Changed paths:
    M libcxx/include/__string/char_traits.h
    M libcxx/include/__string/constexpr_c_functions.h

  Log Message:
  -----------
  [libc++] Optimize char_traits a bit (#72799)

This implements two kinds of optimizations. Specifically
- `char_traits<char8_t>` uses `char` code paths; these are heavily
  optimized and the operations are equivalent
- `char16_t` and `char32_t` `find` uses `std::find` to forward to
  `wmemchr` if they have the same size



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