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Posted to commits@doris.apache.org by we...@apache.org on 2022/06/21 12:55:37 UTC
[doris] 04/05: [wx-sr-opt] use pdqsort to replace std::sort & apply clang-format
This is an automated email from the ASF dual-hosted git repository.
weixiang pushed a commit to branch memtable_opt_rebase_bak
in repository https://gitbox.apache.org/repos/asf/doris.git
commit 6d0fc5680f260da5dc1e4416d08ee67c01b56f54
Author: weixiang <we...@meituan.com>
AuthorDate: Mon May 30 15:31:54 2022 +0800
[wx-sr-opt] use pdqsort to replace std::sort & apply clang-format
---
be/src/olap/memtable.cpp | 20 +-
be/src/olap/memtable.h | 3 +-
be/src/util/pdqsort.h | 601 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 612 insertions(+), 12 deletions(-)
diff --git a/be/src/olap/memtable.cpp b/be/src/olap/memtable.cpp
index 2c8f2a6a15..eebaed0baf 100644
--- a/be/src/olap/memtable.cpp
+++ b/be/src/olap/memtable.cpp
@@ -206,16 +206,16 @@ void MemTable::_sort(const bool finalize) {
}
void MemTable::_sort_block_by_rows() {
- std::sort(_index_for_sort.begin(), _index_for_sort.end(),
- [this](const MemTable::OrderedIndexItem& left,
- const MemTable::OrderedIndexItem& right) {
- int res = _block->compare_at(left.index_in_block, right.index_in_block,
- _schema->num_key_columns(), *_block.get(), -1);
- if (res != 0) {
- return res < 0;
- }
- return left.incoming_index < right.incoming_index;
- });
+ pdqsort(_index_for_sort.begin(), _index_for_sort.end(),
+ [this](const MemTable::OrderedIndexItem& left,
+ const MemTable::OrderedIndexItem& right) {
+ int res = _block->compare_at(left.index_in_block, right.index_in_block,
+ _schema->num_key_columns(), *_block.get(), -1);
+ if (res != 0) {
+ return res < 0;
+ }
+ return left.incoming_index < right.incoming_index;
+ });
}
void MemTable::_append_sorted_block(vectorized::MutableBlock* src, vectorized::MutableBlock* dst) {
diff --git a/be/src/olap/memtable.h b/be/src/olap/memtable.h
index 3df94c6f97..37e38d7b56 100644
--- a/be/src/olap/memtable.h
+++ b/be/src/olap/memtable.h
@@ -23,6 +23,7 @@
#include "olap/olap_define.h"
#include "olap/skiplist.h"
#include "runtime/mem_tracker.h"
+#include "util/pdqsort.h"
#include "util/runtime_profile.h"
#include "util/tuple_row_zorder_compare.h"
#include "vec/aggregate_functions/aggregate_function.h"
@@ -177,7 +178,6 @@ private:
LOG(INFO) << ss.str();
}
-
int64_t _tablet_id;
Schema* _schema;
const TabletSchema* _tablet_schema;
@@ -262,7 +262,6 @@ private:
RuntimeProfile::Counter* _agg_time;
RuntimeProfile::Counter* _finalize_time;
-
}; // class MemTable
inline std::ostream& operator<<(std::ostream& os, const MemTable& table) {
diff --git a/be/src/util/pdqsort.h b/be/src/util/pdqsort.h
new file mode 100644
index 0000000000..44d6e53f0e
--- /dev/null
+++ b/be/src/util/pdqsort.h
@@ -0,0 +1,601 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+//
+// Utility methods for dealing with file paths.
+// these code is copied from https://github.com/orlp/pdqsort
+
+/*
+ pdqsort.h - Pattern-defeating quicksort.
+ Copyright (c) 2021 Orson Peters
+ This software is provided 'as-is', without any express or implied warranty. In no event will the
+ authors be held liable for any damages arising from the use of this software.
+ Permission is granted to anyone to use this software for any purpose, including commercial
+ applications, and to alter it and redistribute it freely, subject to the following restrictions:
+ 1. The origin of this software must not be misrepresented; you must not claim that you wrote the
+ original software. If you use this software in a product, an acknowledgment in the product
+ documentation would be appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be misrepresented as
+ being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef PDQSORT_H
+#define PDQSORT_H
+
+#include <algorithm>
+#include <cstddef>
+#include <functional>
+#include <utility>
+#include <iterator>
+
+#if __cplusplus >= 201103L
+#include <cstdint>
+#include <type_traits>
+#define PDQSORT_PREFER_MOVE(x) std::move(x)
+#else
+#define PDQSORT_PREFER_MOVE(x) (x)
+#endif
+
+namespace pdqsort_detail {
+enum {
+ // Partitions below this size are sorted using insertion sort.
+ insertion_sort_threshold = 24,
+
+ // Partitions above this size use Tukey's ninther to select the pivot.
+ ninther_threshold = 128,
+
+ // When we detect an already sorted partition, attempt an insertion sort that allows this
+ // amount of element moves before giving up.
+ partial_insertion_sort_limit = 8,
+
+ // Must be multiple of 8 due to loop unrolling, and < 256 to fit in unsigned char.
+ block_size = 64,
+
+ // Cacheline size, assumes power of two.
+ cacheline_size = 64
+
+};
+
+#if __cplusplus >= 201103L
+template <class T>
+struct is_default_compare : std::false_type {};
+template <class T>
+struct is_default_compare<std::less<T>> : std::true_type {};
+template <class T>
+struct is_default_compare<std::greater<T>> : std::true_type {};
+#endif
+
+// Returns floor(log2(n)), assumes n > 0.
+template <class T>
+inline int log2(T n) {
+ int log = 0;
+ while (n >>= 1) ++log;
+ return log;
+}
+
+// Sorts [begin, end) using insertion sort with the given comparison function.
+template <class Iter, class Compare>
+inline void insertion_sort(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ if (begin == end) return;
+
+ for (Iter cur = begin + 1; cur != end; ++cur) {
+ Iter sift = cur;
+ Iter sift_1 = cur - 1;
+
+ // Compare first so we can avoid 2 moves for an element already positioned correctly.
+ if (comp(*sift, *sift_1)) {
+ T tmp = PDQSORT_PREFER_MOVE(*sift);
+
+ do {
+ *sift-- = PDQSORT_PREFER_MOVE(*sift_1);
+ } while (sift != begin && comp(tmp, *--sift_1));
+
+ *sift = PDQSORT_PREFER_MOVE(tmp);
+ }
+ }
+}
+
+// Sorts [begin, end) using insertion sort with the given comparison function. Assumes
+// *(begin - 1) is an element smaller than or equal to any element in [begin, end).
+template <class Iter, class Compare>
+inline void unguarded_insertion_sort(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ if (begin == end) return;
+
+ for (Iter cur = begin + 1; cur != end; ++cur) {
+ Iter sift = cur;
+ Iter sift_1 = cur - 1;
+
+ // Compare first so we can avoid 2 moves for an element already positioned correctly.
+ if (comp(*sift, *sift_1)) {
+ T tmp = PDQSORT_PREFER_MOVE(*sift);
+
+ do {
+ *sift-- = PDQSORT_PREFER_MOVE(*sift_1);
+ } while (comp(tmp, *--sift_1));
+
+ *sift = PDQSORT_PREFER_MOVE(tmp);
+ }
+ }
+}
+
+// Attempts to use insertion sort on [begin, end). Will return false if more than
+// partial_insertion_sort_limit elements were moved, and abort sorting. Otherwise it will
+// successfully sort and return true.
+template <class Iter, class Compare>
+inline bool partial_insertion_sort(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ if (begin == end) return true;
+
+ std::size_t limit = 0;
+ for (Iter cur = begin + 1; cur != end; ++cur) {
+ Iter sift = cur;
+ Iter sift_1 = cur - 1;
+
+ // Compare first so we can avoid 2 moves for an element already positioned correctly.
+ if (comp(*sift, *sift_1)) {
+ T tmp = PDQSORT_PREFER_MOVE(*sift);
+
+ do {
+ *sift-- = PDQSORT_PREFER_MOVE(*sift_1);
+ } while (sift != begin && comp(tmp, *--sift_1));
+
+ *sift = PDQSORT_PREFER_MOVE(tmp);
+ limit += cur - sift;
+ }
+
+ if (limit > partial_insertion_sort_limit) return false;
+ }
+
+ return true;
+}
+
+template <class Iter, class Compare>
+inline void sort2(Iter a, Iter b, Compare comp) {
+ if (comp(*b, *a)) std::iter_swap(a, b);
+}
+
+// Sorts the elements *a, *b and *c using comparison function comp.
+template <class Iter, class Compare>
+inline void sort3(Iter a, Iter b, Iter c, Compare comp) {
+ sort2(a, b, comp);
+ sort2(b, c, comp);
+ sort2(a, b, comp);
+}
+
+template <class T>
+inline T* align_cacheline(T* p) {
+#if defined(UINTPTR_MAX) && __cplusplus >= 201103L
+ std::uintptr_t ip = reinterpret_cast<std::uintptr_t>(p);
+#else
+ std::size_t ip = reinterpret_cast<std::size_t>(p);
+#endif
+ ip = (ip + cacheline_size - 1) & -cacheline_size;
+ return reinterpret_cast<T*>(ip);
+}
+
+template <class Iter>
+inline void swap_offsets(Iter first, Iter last, unsigned char* offsets_l, unsigned char* offsets_r,
+ size_t num, bool use_swaps) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ if (use_swaps) {
+ // This case is needed for the descending distribution, where we need
+ // to have proper swapping for pdqsort to remain O(n).
+ for (size_t i = 0; i < num; ++i) {
+ std::iter_swap(first + offsets_l[i], last - offsets_r[i]);
+ }
+ } else if (num > 0) {
+ Iter l = first + offsets_l[0];
+ Iter r = last - offsets_r[0];
+ T tmp(PDQSORT_PREFER_MOVE(*l));
+ *l = PDQSORT_PREFER_MOVE(*r);
+ for (size_t i = 1; i < num; ++i) {
+ l = first + offsets_l[i];
+ *r = PDQSORT_PREFER_MOVE(*l);
+ r = last - offsets_r[i];
+ *l = PDQSORT_PREFER_MOVE(*r);
+ }
+ *r = PDQSORT_PREFER_MOVE(tmp);
+ }
+}
+
+// Partitions [begin, end) around pivot *begin using comparison function comp. Elements equal
+// to the pivot are put in the right-hand partition. Returns the position of the pivot after
+// partitioning and whether the passed sequence already was correctly partitioned. Assumes the
+// pivot is a median of at least 3 elements and that [begin, end) is at least
+// insertion_sort_threshold long. Uses branchless partitioning.
+template <class Iter, class Compare>
+inline std::pair<Iter, bool> partition_right_branchless(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+
+ // Move pivot into local for speed.
+ T pivot(PDQSORT_PREFER_MOVE(*begin));
+ Iter first = begin;
+ Iter last = end;
+
+ // Find the first element greater than or equal than the pivot (the median of 3 guarantees
+ // this exists).
+ while (comp(*++first, pivot))
+ ;
+
+ // Find the first element strictly smaller than the pivot. We have to guard this search if
+ // there was no element before *first.
+ if (first - 1 == begin)
+ while (first < last && !comp(*--last, pivot))
+ ;
+ else
+ while (!comp(*--last, pivot))
+ ;
+
+ // If the first pair of elements that should be swapped to partition are the same element,
+ // the passed in sequence already was correctly partitioned.
+ bool already_partitioned = first >= last;
+ if (!already_partitioned) {
+ std::iter_swap(first, last);
+ ++first;
+
+ // The following branchless partitioning is derived from "BlockQuicksort: How Branch
+ // Mispredictions don’t affect Quicksort" by Stefan Edelkamp and Armin Weiss, but
+ // heavily micro-optimized.
+ unsigned char offsets_l_storage[block_size + cacheline_size];
+ unsigned char offsets_r_storage[block_size + cacheline_size];
+ unsigned char* offsets_l = align_cacheline(offsets_l_storage);
+ unsigned char* offsets_r = align_cacheline(offsets_r_storage);
+
+ Iter offsets_l_base = first;
+ Iter offsets_r_base = last;
+ size_t num_l, num_r, start_l, start_r;
+ num_l = num_r = start_l = start_r = 0;
+
+ while (first < last) {
+ // Fill up offset blocks with elements that are on the wrong side.
+ // First we determine how much elements are considered for each offset block.
+ size_t num_unknown = last - first;
+ size_t left_split = num_l == 0 ? (num_r == 0 ? num_unknown / 2 : num_unknown) : 0;
+ size_t right_split = num_r == 0 ? (num_unknown - left_split) : 0;
+
+ // Fill the offset blocks.
+ if (left_split >= block_size) {
+ for (size_t i = 0; i < block_size;) {
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ }
+ } else {
+ for (size_t i = 0; i < left_split;) {
+ offsets_l[num_l] = i++;
+ num_l += !comp(*first, pivot);
+ ++first;
+ }
+ }
+
+ if (right_split >= block_size) {
+ for (size_t i = 0; i < block_size;) {
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ }
+ } else {
+ for (size_t i = 0; i < right_split;) {
+ offsets_r[num_r] = ++i;
+ num_r += comp(*--last, pivot);
+ }
+ }
+
+ // Swap elements and update block sizes and first/last boundaries.
+ size_t num = std::min(num_l, num_r);
+ swap_offsets(offsets_l_base, offsets_r_base, offsets_l + start_l, offsets_r + start_r,
+ num, num_l == num_r);
+ num_l -= num;
+ num_r -= num;
+ start_l += num;
+ start_r += num;
+
+ if (num_l == 0) {
+ start_l = 0;
+ offsets_l_base = first;
+ }
+
+ if (num_r == 0) {
+ start_r = 0;
+ offsets_r_base = last;
+ }
+ }
+
+ // We have now fully identified [first, last)'s proper position. Swap the last elements.
+ if (num_l) {
+ offsets_l += start_l;
+ while (num_l--) std::iter_swap(offsets_l_base + offsets_l[num_l], --last);
+ first = last;
+ }
+ if (num_r) {
+ offsets_r += start_r;
+ while (num_r--) std::iter_swap(offsets_r_base - offsets_r[num_r], first), ++first;
+ last = first;
+ }
+ }
+
+ // Put the pivot in the right place.
+ Iter pivot_pos = first - 1;
+ *begin = PDQSORT_PREFER_MOVE(*pivot_pos);
+ *pivot_pos = PDQSORT_PREFER_MOVE(pivot);
+
+ return std::make_pair(pivot_pos, already_partitioned);
+}
+
+// Partitions [begin, end) around pivot *begin using comparison function comp. Elements equal
+// to the pivot are put in the right-hand partition. Returns the position of the pivot after
+// partitioning and whether the passed sequence already was correctly partitioned. Assumes the
+// pivot is a median of at least 3 elements and that [begin, end) is at least
+// insertion_sort_threshold long.
+template <class Iter, class Compare>
+inline std::pair<Iter, bool> partition_right(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+
+ // Move pivot into local for speed.
+ T pivot(PDQSORT_PREFER_MOVE(*begin));
+
+ Iter first = begin;
+ Iter last = end;
+
+ // Find the first element greater than or equal than the pivot (the median of 3 guarantees
+ // this exists).
+ while (comp(*++first, pivot))
+ ;
+
+ // Find the first element strictly smaller than the pivot. We have to guard this search if
+ // there was no element before *first.
+ if (first - 1 == begin)
+ while (first < last && !comp(*--last, pivot))
+ ;
+ else
+ while (!comp(*--last, pivot))
+ ;
+
+ // If the first pair of elements that should be swapped to partition are the same element,
+ // the passed in sequence already was correctly partitioned.
+ bool already_partitioned = first >= last;
+
+ // Keep swapping pairs of elements that are on the wrong side of the pivot. Previously
+ // swapped pairs guard the searches, which is why the first iteration is special-cased
+ // above.
+ while (first < last) {
+ std::iter_swap(first, last);
+ while (comp(*++first, pivot))
+ ;
+ while (!comp(*--last, pivot))
+ ;
+ }
+
+ // Put the pivot in the right place.
+ Iter pivot_pos = first - 1;
+ *begin = PDQSORT_PREFER_MOVE(*pivot_pos);
+ *pivot_pos = PDQSORT_PREFER_MOVE(pivot);
+
+ return std::make_pair(pivot_pos, already_partitioned);
+}
+
+// Similar function to the one above, except elements equal to the pivot are put to the left of
+// the pivot and it doesn't check or return if the passed sequence already was partitioned.
+// Since this is rarely used (the many equal case), and in that case pdqsort already has O(n)
+// performance, no block quicksort is applied here for simplicity.
+template <class Iter, class Compare>
+inline Iter partition_left(Iter begin, Iter end, Compare comp) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+
+ T pivot(PDQSORT_PREFER_MOVE(*begin));
+ Iter first = begin;
+ Iter last = end;
+
+ while (comp(pivot, *--last))
+ ;
+
+ if (last + 1 == end)
+ while (first < last && !comp(pivot, *++first))
+ ;
+ else
+ while (!comp(pivot, *++first))
+ ;
+
+ while (first < last) {
+ std::iter_swap(first, last);
+ while (comp(pivot, *--last))
+ ;
+ while (!comp(pivot, *++first))
+ ;
+ }
+
+ Iter pivot_pos = last;
+ *begin = PDQSORT_PREFER_MOVE(*pivot_pos);
+ *pivot_pos = PDQSORT_PREFER_MOVE(pivot);
+
+ return pivot_pos;
+}
+
+template <class Iter, class Compare, bool Branchless>
+inline void pdqsort_loop(Iter begin, Iter end, Compare comp, int bad_allowed,
+ bool leftmost = true) {
+ typedef typename std::iterator_traits<Iter>::difference_type diff_t;
+
+ // Use a while loop for tail recursion elimination.
+ while (true) {
+ diff_t size = end - begin;
+
+ // Insertion sort is faster for small arrays.
+ if (size < insertion_sort_threshold) {
+ if (leftmost)
+ insertion_sort(begin, end, comp);
+ else
+ unguarded_insertion_sort(begin, end, comp);
+ return;
+ }
+
+ // Choose pivot as median of 3 or pseudomedian of 9.
+ diff_t s2 = size / 2;
+ if (size > ninther_threshold) {
+ sort3(begin, begin + s2, end - 1, comp);
+ sort3(begin + 1, begin + (s2 - 1), end - 2, comp);
+ sort3(begin + 2, begin + (s2 + 1), end - 3, comp);
+ sort3(begin + (s2 - 1), begin + s2, begin + (s2 + 1), comp);
+ std::iter_swap(begin, begin + s2);
+ } else
+ sort3(begin + s2, begin, end - 1, comp);
+
+ // If *(begin - 1) is the end of the right partition of a previous partition operation
+ // there is no element in [begin, end) that is smaller than *(begin - 1). Then if our
+ // pivot compares equal to *(begin - 1) we change strategy, putting equal elements in
+ // the left partition, greater elements in the right partition. We do not have to
+ // recurse on the left partition, since it's sorted (all equal).
+ if (!leftmost && !comp(*(begin - 1), *begin)) {
+ begin = partition_left(begin, end, comp) + 1;
+ continue;
+ }
+
+ // Partition and get results.
+ std::pair<Iter, bool> part_result = Branchless
+ ? partition_right_branchless(begin, end, comp)
+ : partition_right(begin, end, comp);
+ Iter pivot_pos = part_result.first;
+ bool already_partitioned = part_result.second;
+
+ // Check for a highly unbalanced partition.
+ diff_t l_size = pivot_pos - begin;
+ diff_t r_size = end - (pivot_pos + 1);
+ bool highly_unbalanced = l_size < size / 8 || r_size < size / 8;
+
+ // If we got a highly unbalanced partition we shuffle elements to break many patterns.
+ if (highly_unbalanced) {
+ // If we had too many bad partitions, switch to heapsort to guarantee O(n log n).
+ if (--bad_allowed == 0) {
+ std::make_heap(begin, end, comp);
+ std::sort_heap(begin, end, comp);
+ return;
+ }
+
+ if (l_size >= insertion_sort_threshold) {
+ std::iter_swap(begin, begin + l_size / 4);
+ std::iter_swap(pivot_pos - 1, pivot_pos - l_size / 4);
+
+ if (l_size > ninther_threshold) {
+ std::iter_swap(begin + 1, begin + (l_size / 4 + 1));
+ std::iter_swap(begin + 2, begin + (l_size / 4 + 2));
+ std::iter_swap(pivot_pos - 2, pivot_pos - (l_size / 4 + 1));
+ std::iter_swap(pivot_pos - 3, pivot_pos - (l_size / 4 + 2));
+ }
+ }
+
+ if (r_size >= insertion_sort_threshold) {
+ std::iter_swap(pivot_pos + 1, pivot_pos + (1 + r_size / 4));
+ std::iter_swap(end - 1, end - r_size / 4);
+
+ if (r_size > ninther_threshold) {
+ std::iter_swap(pivot_pos + 2, pivot_pos + (2 + r_size / 4));
+ std::iter_swap(pivot_pos + 3, pivot_pos + (3 + r_size / 4));
+ std::iter_swap(end - 2, end - (1 + r_size / 4));
+ std::iter_swap(end - 3, end - (2 + r_size / 4));
+ }
+ }
+ } else {
+ // If we were decently balanced and we tried to sort an already partitioned
+ // sequence try to use insertion sort.
+ if (already_partitioned && partial_insertion_sort(begin, pivot_pos, comp) &&
+ partial_insertion_sort(pivot_pos + 1, end, comp))
+ return;
+ }
+
+ // Sort the left partition first using recursion and do tail recursion elimination for
+ // the right-hand partition.
+ pdqsort_loop<Iter, Compare, Branchless>(begin, pivot_pos, comp, bad_allowed, leftmost);
+ begin = pivot_pos + 1;
+ leftmost = false;
+ }
+}
+} // namespace pdqsort_detail
+
+template <class Iter, class Compare>
+inline void pdqsort(Iter begin, Iter end, Compare comp) {
+ if (begin == end) return;
+
+#if __cplusplus >= 201103L
+ pdqsort_detail::pdqsort_loop<
+ Iter, Compare,
+ pdqsort_detail::is_default_compare<typename std::decay<Compare>::type>::value &&
+ std::is_arithmetic<typename std::iterator_traits<Iter>::value_type>::value>(
+ begin, end, comp, pdqsort_detail::log2(end - begin));
+#else
+ pdqsort_detail::pdqsort_loop<Iter, Compare, false>(begin, end, comp,
+ pdqsort_detail::log2(end - begin));
+#endif
+}
+
+template <class Iter>
+inline void pdqsort(Iter begin, Iter end) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ pdqsort(begin, end, std::less<T>());
+}
+
+template <class Iter, class Compare>
+inline void pdqsort_branchless(Iter begin, Iter end, Compare comp) {
+ if (begin == end) return;
+ pdqsort_detail::pdqsort_loop<Iter, Compare, true>(begin, end, comp,
+ pdqsort_detail::log2(end - begin));
+}
+
+template <class Iter>
+inline void pdqsort_branchless(Iter begin, Iter end) {
+ typedef typename std::iterator_traits<Iter>::value_type T;
+ pdqsort_branchless(begin, end, std::less<T>());
+}
+
+#undef PDQSORT_PREFER_MOVE
+
+#endif
\ No newline at end of file
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