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
14template <class Comp, class RandomAccessIterator>
15void __sort(RandomAccessIterator first, RandomAccessIterator last, Comp comp) {
16  if (first == last) // log(0) is undefined, so don't try computing the depth
17    return;
18
19  auto depth_limit = 2 * std::__bit_log2(static_cast<size_t>(last - first));
20
21  // Only use bitset partitioning for arithmetic types.  We should also check
22  // that the default comparator is in use so that we are sure that there are no
23  // branches in the comparator.
24  std::__introsort<_ClassicAlgPolicy,
25                   ranges::less,
26                   RandomAccessIterator,
27                   __use_branchless_sort<ranges::less, RandomAccessIterator>>(first, last, ranges::less{}, depth_limit);
28}
29
30// clang-format off
31template void __sort<__less<char>&, char*>(char*, char*, __less<char>&);
32#if _LIBCPP_HAS_WIDE_CHARACTERS
33template void __sort<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&);
34#endif
35template void __sort<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&);
36template void __sort<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&);
37template void __sort<__less<short>&, short*>(short*, short*, __less<short>&);
38template void __sort<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&);
39template void __sort<__less<int>&, int*>(int*, int*, __less<int>&);
40template void __sort<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&);
41template void __sort<__less<long>&, long*>(long*, long*, __less<long>&);
42template void __sort<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&);
43template void __sort<__less<long long>&, long long*>(long long*, long long*, __less<long long>&);
44template void __sort<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&);
45template void __sort<__less<float>&, float*>(float*, float*, __less<float>&);
46template void __sort<__less<double>&, double*>(double*, double*, __less<double>&);
47template void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&);
48// clang-format on
49
50_LIBCPP_END_NAMESPACE_STD