libcxx/src/algorithm.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <algorithm>
  10 #include <bit>
  11
  12 _LIBCPP_BEGIN_NAMESPACE_STD
  13
  14 template <class Comp, class RandomAccessIterator>
  15 void __sort(RandomAccessIterator first, RandomAccessIterator last, Comp comp) {
  16   auto depth_limit = 2 * std::__bit_log2(static_cast<size_t>(last - first));
  17
  18   // Only use bitset partitioning for arithmetic types.  We should also check
  19   // that the default comparator is in use so that we are sure that there are no
  20   // branches in the comparator.
  21   std::__introsort<_ClassicAlgPolicy,
  22                    ranges::less,
  23                    RandomAccessIterator,
  24                    __use_branchless_sort<ranges::less, RandomAccessIterator>::value>(
  25       first, last, ranges::less{}, depth_limit);
  26 }
  27
  28 // clang-format off
  29 template void __sort<__less<char>&, char*>(char*, char*, __less<char>&);
  30 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
  31 template void __sort<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
  32 #endif
  33 template void __sort<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&);
  34 template void __sort<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&);
  35 template void __sort<__less<short>&, short*>(short*, short*, __less<short>&);
  36 template void __sort<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&);
  37 template void __sort<__less<int>&, int*>(int*, int*, __less<int>&);
  38 template void __sort<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&);
  39 template void __sort<__less<long>&, long*>(long*, long*, __less<long>&);
  40 template void __sort<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&);
  41 template void __sort<__less<long long>&, long long*>(long long*, long long*, __less<long long>&);
  42 template void __sort<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&);
  43 template void __sort<__less<float>&, float*>(float*, float*, __less<float>&);
  44 template void __sort<__less<double>&, double*>(double*, double*, __less<double>&);
  45 template void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
  46 // clang-format on
  47
  48 _LIBCPP_END_NAMESPACE_STD