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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_STABLE_SORT_H
#define _LIBCPP___ALGORITHM_STABLE_SORT_H
#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/inplace_merge.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/radix_sort.h>
#include <__algorithm/sort.h>
#include <__config>
#include <__cstddef/ptrdiff_t.h>
#include <__debug_utils/strict_weak_ordering_check.h>
#include <__iterator/iterator_traits.h>
#include <__memory/construct_at.h>
#include <__memory/destruct_n.h>
#include <__memory/unique_ptr.h>
#include <__memory/unique_temporary_buffer.h>
#include <__type_traits/desugars_to.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_integral.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_trivially_assignable.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _AlgPolicy, class _Compare, class _BidirectionalIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __insertion_sort_move(
_BidirectionalIterator __first1,
_BidirectionalIterator __last1,
typename iterator_traits<_BidirectionalIterator>::value_type* __first2,
_Compare __comp) {
using _Ops = _IterOps<_AlgPolicy>;
typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type;
if (__first1 != __last1) {
__destruct_n __d(0);
unique_ptr<value_type, __destruct_n&> __h(__first2, __d);
value_type* __last2 = __first2;
std::__construct_at(__last2, _Ops::__iter_move(__first1));
__d.template __incr<value_type>();
for (++__last2; ++__first1 != __last1; ++__last2) {
value_type* __j2 = __last2;
value_type* __i2 = __j2;
if (__comp(*__first1, *--__i2)) {
std::__construct_at(__j2, std::move(*__i2));
__d.template __incr<value_type>();
for (--__j2; __i2 != __first2 && __comp(*__first1, *--__i2); --__j2)
*__j2 = std::move(*__i2);
*__j2 = _Ops::__iter_move(__first1);
} else {
std::__construct_at(__j2, _Ops::__iter_move(__first1));
__d.template __incr<value_type>();
}
}
__h.release();
}
}
template <class _AlgPolicy, class _Compare, class _InputIterator1, class _InputIterator2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __merge_move_construct(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
typename iterator_traits<_InputIterator1>::value_type* __result,
_Compare __comp) {
using _Ops = _IterOps<_AlgPolicy>;
typedef typename iterator_traits<_InputIterator1>::value_type value_type;
__destruct_n __d(0);
unique_ptr<value_type, __destruct_n&> __h(__result, __d);
for (; true; ++__result) {
if (__first1 == __last1) {
for (; __first2 != __last2; ++__first2, (void)++__result, __d.template __incr<value_type>())
std::__construct_at(__result, _Ops::__iter_move(__first2));
__h.release();
return;
}
if (__first2 == __last2) {
for (; __first1 != __last1; ++__first1, (void)++__result, __d.template __incr<value_type>())
std::__construct_at(__result, _Ops::__iter_move(__first1));
__h.release();
return;
}
if (__comp(*__first2, *__first1)) {
std::__construct_at(__result, _Ops::__iter_move(__first2));
__d.template __incr<value_type>();
++__first2;
} else {
std::__construct_at(__result, _Ops::__iter_move(__first1));
__d.template __incr<value_type>();
++__first1;
}
}
}
template <class _AlgPolicy, class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __merge_move_assign(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result,
_Compare __comp) {
using _Ops = _IterOps<_AlgPolicy>;
for (; __first1 != __last1; ++__result) {
if (__first2 == __last2) {
for (; __first1 != __last1; ++__first1, (void)++__result)
*__result = _Ops::__iter_move(__first1);
return;
}
if (__comp(*__first2, *__first1)) {
*__result = _Ops::__iter_move(__first2);
++__first2;
} else {
*__result = _Ops::__iter_move(__first1);
++__first1;
}
}
for (; __first2 != __last2; ++__first2, (void)++__result)
*__result = _Ops::__iter_move(__first2);
}
template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX26 void __stable_sort(
_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Compare __comp,
typename iterator_traits<_RandomAccessIterator>::difference_type __len,
typename iterator_traits<_RandomAccessIterator>::value_type* __buff,
ptrdiff_t __buff_size);
template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX26 void __stable_sort_move(
_RandomAccessIterator __first1,
_RandomAccessIterator __last1,
_Compare __comp,
typename iterator_traits<_RandomAccessIterator>::difference_type __len,
typename iterator_traits<_RandomAccessIterator>::value_type* __first2) {
using _Ops = _IterOps<_AlgPolicy>;
typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type;
switch (__len) {
case 0:
return;
case 1:
std::__construct_at(__first2, _Ops::__iter_move(__first1));
return;
case 2:
__destruct_n __d(0);
unique_ptr<value_type, __destruct_n&> __h2(__first2, __d);
if (__comp(*--__last1, *__first1)) {
std::__construct_at(__first2, _Ops::__iter_move(__last1));
__d.template __incr<value_type>();
++__first2;
std::__construct_at(__first2, _Ops::__iter_move(__first1));
} else {
std::__construct_at(__first2, _Ops::__iter_move(__first1));
__d.template __incr<value_type>();
++__first2;
std::__construct_at(__first2, _Ops::__iter_move(__last1));
}
__h2.release();
return;
}
if (__len <= 8) {
std::__insertion_sort_move<_AlgPolicy, _Compare>(__first1, __last1, __first2, __comp);
return;
}
typename iterator_traits<_RandomAccessIterator>::difference_type __l2 = __len / 2;
_RandomAccessIterator __m = __first1 + __l2;
std::__stable_sort<_AlgPolicy, _Compare>(__first1, __m, __comp, __l2, __first2, __l2);
std::__stable_sort<_AlgPolicy, _Compare>(__m, __last1, __comp, __len - __l2, __first2 + __l2, __len - __l2);
std::__merge_move_construct<_AlgPolicy, _Compare>(__first1, __m, __m, __last1, __first2, __comp);
}
template <class _Tp>
struct __stable_sort_switch {
static const unsigned value = 128 * is_trivially_copy_assignable<_Tp>::value;
};
#if _LIBCPP_STD_VER >= 17
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr unsigned __radix_sort_min_bound() {
static_assert(is_integral<_Tp>::value);
if constexpr (sizeof(_Tp) == 1) {
return 1 << 8;
}
return 1 << 10;
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI constexpr unsigned __radix_sort_max_bound() {
static_assert(is_integral<_Tp>::value);
if constexpr (sizeof(_Tp) >= 8) {
return 1 << 15;
}
return 1 << 16;
}
#endif // _LIBCPP_STD_VER >= 17
template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX26 void __stable_sort(
_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Compare __comp,
typename iterator_traits<_RandomAccessIterator>::difference_type __len,
typename iterator_traits<_RandomAccessIterator>::value_type* __buff,
ptrdiff_t __buff_size) {
typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type;
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
switch (__len) {
case 0:
case 1:
return;
case 2:
if (__comp(*--__last, *__first))
_IterOps<_AlgPolicy>::iter_swap(__first, __last);
return;
}
if (__len <= static_cast<difference_type>(__stable_sort_switch<value_type>::value)) {
std::__insertion_sort<_AlgPolicy, _Compare>(__first, __last, __comp);
return;
}
#if _LIBCPP_STD_VER >= 17
constexpr auto __default_comp =
__desugars_to_v<__totally_ordered_less_tag, __remove_cvref_t<_Compare>, value_type, value_type >;
constexpr auto __integral_value =
is_integral_v<value_type > && is_same_v< value_type&, __iter_reference<_RandomAccessIterator>>;
constexpr auto __allowed_radix_sort = __default_comp && __integral_value;
if constexpr (__allowed_radix_sort) {
if (__len <= __buff_size && __len >= static_cast<difference_type>(__radix_sort_min_bound<value_type>()) &&
__len <= static_cast<difference_type>(__radix_sort_max_bound<value_type>())) {
std::__radix_sort(__first, __last, __buff);
return;
}
}
#endif // _LIBCPP_STD_VER >= 17
typename iterator_traits<_RandomAccessIterator>::difference_type __l2 = __len / 2;
_RandomAccessIterator __m = __first + __l2;
if (__len <= __buff_size) {
__destruct_n __d(0);
unique_ptr<value_type, __destruct_n&> __h2(__buff, __d);
std::__stable_sort_move<_AlgPolicy, _Compare>(__first, __m, __comp, __l2, __buff);
__d.__set(__l2, (value_type*)nullptr);
std::__stable_sort_move<_AlgPolicy, _Compare>(__m, __last, __comp, __len - __l2, __buff + __l2);
__d.__set(__len, (value_type*)nullptr);
std::__merge_move_assign<_AlgPolicy, _Compare>(
__buff, __buff + __l2, __buff + __l2, __buff + __len, __first, __comp);
// std::__merge<_Compare>(move_iterator<value_type*>(__buff),
// move_iterator<value_type*>(__buff + __l2),
// move_iterator<_RandomAccessIterator>(__buff + __l2),
// move_iterator<_RandomAccessIterator>(__buff + __len),
// __first, __comp);
return;
}
std::__stable_sort<_AlgPolicy, _Compare>(__first, __m, __comp, __l2, __buff, __buff_size);
std::__stable_sort<_AlgPolicy, _Compare>(__m, __last, __comp, __len - __l2, __buff, __buff_size);
std::__inplace_merge<_AlgPolicy>(__first, __m, __last, __comp, __l2, __len - __l2, __buff, __buff_size);
}
template <class _AlgPolicy, class _RandomAccessIterator, class _Compare>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void
__stable_sort_impl(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare& __comp) {
using value_type = typename iterator_traits<_RandomAccessIterator>::value_type;
using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type;
difference_type __len = __last - __first;
__unique_temporary_buffer<value_type> __unique_buf;
pair<value_type*, ptrdiff_t> __buf(0, 0);
if (__len > static_cast<difference_type>(__stable_sort_switch<value_type>::value)) {
__unique_buf = std::__allocate_unique_temporary_buffer<value_type>(__len);
__buf.first = __unique_buf.get();
__buf.second = __unique_buf.get_deleter().__count_;
}
std::__stable_sort<_AlgPolicy, __comp_ref_type<_Compare> >(__first, __last, __comp, __len, __buf.first, __buf.second);
std::__check_strict_weak_ordering_sorted(__first, __last, __comp);
}
template <class _RandomAccessIterator, class _Compare>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void
stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {
std::__stable_sort_impl<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);
}
template <class _RandomAccessIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void
stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last) {
std::stable_sort(__first, __last, __less<>());
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ALGORITHM_STABLE_SORT_H
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