[libc++] Optimize __tree copy/move constructor/assignment with allocator #163558
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
✅ With the latest revision this PR passed the C/C++ code formatter. |
philnik777
force-pushed
the
optimize_tree_allocator_construct_assign
branch
2 times, most recently
from
3ff4f27 to
1ab12ac
Compare
philnik777
force-pushed
the
optimize_tree_allocator_construct_assign
branch
from
1ab12ac to
dddd4fb
Compare
llvmbot
added
the
libc++
|
@llvm/pr-subscribers-libcxx Author: Nikolas Klauser (philnik777) ChangesPatch is 29.25 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/163558.diff 14 Files Affected:
diff --git a/libcxx/include/__tree b/libcxx/include/__tree
index 0738c8c6a5e2b..eb833b97af2db 100644
--- a/libcxx/include/__tree
+++ b/libcxx/include/__tree
@@ -899,6 +899,18 @@ public:
}
_LIBCPP_HIDE_FROM_ABI __tree(const __tree& __t);
+
+ _LIBCPP_HIDE_FROM_ABI __tree(const __tree& __other, const allocator_type& __alloc)
+ : __begin_node_(__end_node()), __node_alloc_(__alloc), __size_(0), __value_comp_(__other.value_comp()) {
+ if (__other.size() == 0)
+ return;
+
+ *__root_ptr() = static_cast<__node_base_pointer>(__copy_construct_tree(__other.__root()));
+ __root()->__parent_ = __end_node();
+ __begin_node_ = static_cast<__end_node_pointer>(std::__tree_min(__end_node()->__left_));
+ __size_ = __other.size();
+ }
+
_LIBCPP_HIDE_FROM_ABI __tree& operator=(const __tree& __t);
template <class _ForwardIterator>
_LIBCPP_HIDE_FROM_ABI void __assign_unique(_ForwardIterator __first, _ForwardIterator __last);
@@ -1007,27 +1019,6 @@ public:
std::forward<_Args>(__args)...);
}
- template <class _ValueT = _Tp, __enable_if_t<__is_tree_value_type_v<_ValueT>, int> = 0>
- _LIBCPP_HIDE_FROM_ABI void
- __insert_unique_from_orphaned_node(const_iterator __p, __get_node_value_type_t<_Tp>&& __value) {
- __emplace_hint_unique(__p, const_cast<key_type&&>(__value.first), std::move(__value.second));
- }
-
- template <class _ValueT = _Tp, __enable_if_t<!__is_tree_value_type_v<_ValueT>, int> = 0>
- _LIBCPP_HIDE_FROM_ABI void __insert_unique_from_orphaned_node(const_iterator __p, _Tp&& __value) {
- __emplace_hint_unique(__p, std::move(__value));
- }
-
- template <class _ValueT = _Tp, __enable_if_t<__is_tree_value_type_v<_ValueT>, int> = 0>
- _LIBCPP_HIDE_FROM_ABI void __insert_multi_from_orphaned_node(const_iterator __p, value_type&& __value) {
- __emplace_hint_multi(__p, const_cast<key_type&&>(__value.first), std::move(__value.second));
- }
-
- template <class _ValueT = _Tp, __enable_if_t<!__is_tree_value_type_v<_ValueT>, int> = 0>
- _LIBCPP_HIDE_FROM_ABI void __insert_multi_from_orphaned_node(const_iterator __p, _Tp&& __value) {
- __emplace_hint_multi(__p, std::move(__value));
- }
-
template <class _InIter, class _Sent>
_LIBCPP_HIDE_FROM_ABI void __insert_range_multi(_InIter __first, _Sent __last) {
if (__first == __last)
@@ -1400,19 +1391,19 @@ private:
// copy the exact structure 1:1. Since this is for copy construction _only_ we know that we get a correct tree. If we
// didn't get a correct tree, the invariants of __tree are broken and we have a much bigger problem than an improperly
// balanced tree.
+ template <class _NodeConstructor>
#ifdef _LIBCPP_COMPILER_CLANG_BASED // FIXME: GCC complains about not being able to always_inline a recursive function
_LIBCPP_HIDE_FROM_ABI
#endif
- __node_pointer
- __copy_construct_tree(__node_pointer __src) {
+ __node_pointer __construct_from_tree(__node_pointer __src, _NodeConstructor __construct) {
if (!__src)
return nullptr;
- __node_holder __new_node = __construct_node(__src->__get_value());
+ __node_holder __new_node = __construct(__src->__get_value());
unique_ptr<__node, __tree_deleter> __left(
- __copy_construct_tree(static_cast<__node_pointer>(__src->__left_)), __node_alloc_);
- __node_pointer __right = __copy_construct_tree(static_cast<__node_pointer>(__src->__right_));
+ __construct_from_tree(static_cast<__node_pointer>(__src->__left_), __construct), __node_alloc_);
+ __node_pointer __right = __construct_from_tree(static_cast<__node_pointer>(__src->__right_), __construct);
__node_pointer __new_node_ptr = __new_node.release();
@@ -1426,46 +1417,85 @@ private:
return __new_node_ptr;
}
+ _LIBCPP_HIDE_FROM_ABI __node_pointer __copy_construct_tree(__node_pointer __src) {
+ return __construct_from_tree(__src, [this](const value_type& __val) { return __construct_node(__val); });
+ }
+
+ template <class _ValueT = _Tp, __enable_if_t<__is_tree_value_type_v<_ValueT>, int> = 0>
+ _LIBCPP_HIDE_FROM_ABI __node_pointer __move_construct_tree(__node_pointer __src) {
+ return __construct_from_tree(__src, [this](value_type& __val) {
+ return __construct_node(const_cast<key_type&&>(__val.first), std::move(__val.second));
+ });
+ }
+
+ template <class _ValueT = _Tp, __enable_if_t<!__is_tree_value_type_v<_ValueT>, int> = 0>
+ _LIBCPP_HIDE_FROM_ABI __node_pointer __move_construct_tree(__node_pointer __src) {
+ return __construct_from_tree(__src, [this](value_type& __val) { return __construct_node(std::move(__val)); });
+ }
+
+ template <class _Assignment, class _ConstructionAlg>
// This copy assignment will always produce a correct red-black-tree assuming the incoming tree is correct, since our
// own tree is a red-black-tree and the incoming tree is a red-black-tree. The invariants of a red-black-tree are
// temporarily not met until all of the incoming red-black tree is copied.
#ifdef _LIBCPP_COMPILER_CLANG_BASED // FIXME: GCC complains about not being able to always_inline a recursive function
_LIBCPP_HIDE_FROM_ABI
#endif
- __node_pointer
- __copy_assign_tree(__node_pointer __dest, __node_pointer __src) {
+ __node_pointer __assign_from_tree(
+ __node_pointer __dest, __node_pointer __src, _Assignment __assign, _ConstructionAlg __continue_with_construct) {
if (!__src) {
destroy(__dest);
return nullptr;
}
- __assign_value(__dest->__get_value(), __src->__get_value());
+ __assign(__dest->__get_value(), __src->__get_value());
__dest->__is_black_ = __src->__is_black_;
// If we already have a left node in the destination tree, reuse it and copy-assign recursively
if (__dest->__left_) {
- __dest->__left_ = static_cast<__node_base_pointer>(__copy_assign_tree(
- static_cast<__node_pointer>(__dest->__left_), static_cast<__node_pointer>(__src->__left_)));
+ __dest->__left_ = static_cast<__node_base_pointer>(__assign_from_tree(
+ static_cast<__node_pointer>(__dest->__left_),
+ static_cast<__node_pointer>(__src->__left_),
+ __assign,
+ __continue_with_construct));
// Otherwise, we must create new nodes; copy-construct from here on
} else if (__src->__left_) {
- auto __new_left = __copy_construct_tree(static_cast<__node_pointer>(__src->__left_));
+ auto __new_left = __continue_with_construct(static_cast<__node_pointer>(__src->__left_));
__dest->__left_ = static_cast<__node_base_pointer>(__new_left);
__new_left->__parent_ = static_cast<__end_node_pointer>(__dest);
}
// Identical to the left case above, just for the right nodes
if (__dest->__right_) {
- __dest->__right_ = static_cast<__node_base_pointer>(__copy_assign_tree(
- static_cast<__node_pointer>(__dest->__right_), static_cast<__node_pointer>(__src->__right_)));
+ __dest->__right_ = static_cast<__node_base_pointer>(__assign_from_tree(
+ static_cast<__node_pointer>(__dest->__right_),
+ static_cast<__node_pointer>(__src->__right_),
+ __assign,
+ __continue_with_construct));
} else if (__src->__right_) {
- auto __new_right = __copy_construct_tree(static_cast<__node_pointer>(__src->__right_));
+ auto __new_right = __continue_with_construct(static_cast<__node_pointer>(__src->__right_));
__dest->__right_ = static_cast<__node_base_pointer>(__new_right);
__new_right->__parent_ = static_cast<__end_node_pointer>(__dest);
}
return __dest;
}
+
+ _LIBCPP_HIDE_FROM_ABI __node_pointer __copy_assign_tree(__node_pointer __dest, __node_pointer __src) {
+ return __assign_from_tree(
+ __dest,
+ __src,
+ [](value_type& __lhs, const value_type& __rhs) { __assign_value(__lhs, std::move(__rhs)); },
+ [this](__node_pointer __nd) { return __copy_construct_tree(__nd); });
+ }
+
+ _LIBCPP_HIDE_FROM_ABI __node_pointer __move_assign_tree(__node_pointer __dest, __node_pointer __src) {
+ return __assign_from_tree(
+ __dest,
+ __src,
+ [](value_type& __lhs, value_type& __rhs) { __assign_value(__lhs, std::move(__rhs)); },
+ [this](__node_pointer __nd) { return __move_construct_tree(__nd); });
+ }
};
// Precondition: __size_ != 0
@@ -1606,21 +1636,26 @@ __tree<_Tp, _Compare, _Allocator>::__tree(__tree&& __t) _NOEXCEPT_(
template <class _Tp, class _Compare, class _Allocator>
__tree<_Tp, _Compare, _Allocator>::__tree(__tree&& __t, const allocator_type& __a)
- : __node_alloc_(__node_allocator(__a)), __size_(0), __value_comp_(std::move(__t.value_comp())) {
+ : __begin_node_(__end_node()),
+ __node_alloc_(__node_allocator(__a)),
+ __size_(0),
+ __value_comp_(std::move(__t.value_comp())) {
+ if (__t.size() == 0)
+ return;
if (__a == __t.__alloc()) {
- if (__t.__size_ == 0)
- __begin_node_ = __end_node();
- else {
- __begin_node_ = __t.__begin_node_;
- __end_node()->__left_ = __t.__end_node()->__left_;
- __end_node()->__left_->__parent_ = static_cast<__end_node_pointer>(__end_node());
- __size_ = __t.__size_;
- __t.__begin_node_ = __t.__end_node();
- __t.__end_node()->__left_ = nullptr;
- __t.__size_ = 0;
- }
+ __begin_node_ = __t.__begin_node_;
+ __end_node()->__left_ = __t.__end_node()->__left_;
+ __end_node()->__left_->__parent_ = static_cast<__end_node_pointer>(__end_node());
+ __size_ = __t.__size_;
+ __t.__begin_node_ = __t.__end_node();
+ __t.__end_node()->__left_ = nullptr;
+ __t.__size_ = 0;
} else {
- __begin_node_ = __end_node();
+ *__root_ptr() = static_cast<__node_base_pointer>(__move_construct_tree(__t.__root()));
+ __root()->__parent_ = __end_node();
+ __begin_node_ = static_cast<__end_node_pointer>(std::__tree_min(__end_node()->__left_));
+ __size_ = __t.size();
+ __t.clear(); // Ensure that __t is in a valid state after moving out the keys
}
}
@@ -1645,22 +1680,21 @@ void __tree<_Tp, _Compare, _Allocator>::__move_assign(__tree& __t, true_type)
template <class _Tp, class _Compare, class _Allocator>
void __tree<_Tp, _Compare, _Allocator>::__move_assign(__tree& __t, false_type) {
- if (__node_alloc() == __t.__node_alloc())
+ if (__node_alloc() == __t.__node_alloc()) {
__move_assign(__t, true_type());
- else {
- value_comp() = std::move(__t.value_comp());
- const_iterator __e = end();
+ } else {
+ value_comp() = std::move(__t.value_comp());
if (__size_ != 0) {
- _DetachedTreeCache __cache(this);
- while (__cache.__get() != nullptr && __t.__size_ != 0) {
- __assign_value(__cache.__get()->__get_value(), std::move(__t.remove(__t.begin())->__get_value()));
- __node_insert_multi(__cache.__get());
- __cache.__advance();
- }
- }
- while (__t.__size_ != 0) {
- __insert_multi_from_orphaned_node(__e, std::move(__t.remove(__t.begin())->__get_value()));
+ *__root_ptr() = static_cast<__node_base_pointer>(__move_assign_tree(__root(), __t.__root()));
+ } else {
+ *__root_ptr() = static_cast<__node_base_pointer>(__move_construct_tree(__t.__root()));
+ if (__root())
+ __root()->__parent_ = __end_node();
}
+ __begin_node_ =
+ __end_node()->__left_ ? static_cast<__end_node_pointer>(std::__tree_min(__end_node()->__left_)) : __end_node();
+ __size_ = __t.size();
+ __t.clear(); // Ensure that __t is in a valid state after moving out the keys
}
}
diff --git a/libcxx/include/map b/libcxx/include/map
index 3ff849afcde09..28016374d3551 100644
--- a/libcxx/include/map
+++ b/libcxx/include/map
@@ -997,7 +997,7 @@ public:
_LIBCPP_HIDE_FROM_ABI map(map&& __m) = default;
- _LIBCPP_HIDE_FROM_ABI map(map&& __m, const allocator_type& __a);
+ _LIBCPP_HIDE_FROM_ABI map(map&& __m, const allocator_type& __a) : __tree_(std::move(__m.__tree_), __a) {}
_LIBCPP_HIDE_FROM_ABI map& operator=(map&& __m) = default;
@@ -1025,10 +1025,7 @@ public:
_LIBCPP_HIDE_FROM_ABI explicit map(const allocator_type& __a) : __tree_(typename __base::allocator_type(__a)) {}
- _LIBCPP_HIDE_FROM_ABI map(const map& __m, const allocator_type& __a)
- : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a)) {
- insert(__m.begin(), __m.end());
- }
+ _LIBCPP_HIDE_FROM_ABI map(const map& __m, const allocator_type& __alloc) : __tree_(__m.__tree_, __alloc) {}
_LIBCPP_HIDE_FROM_ABI ~map() { static_assert(sizeof(std::__diagnose_non_const_comparator<_Key, _Compare>()), ""); }
@@ -1428,18 +1425,6 @@ map(initializer_list<pair<_Key, _Tp>>, _Allocator)
# endif
# ifndef _LIBCPP_CXX03_LANG
-template <class _Key, class _Tp, class _Compare, class _Allocator>
-map<_Key, _Tp, _Compare, _Allocator>::map(map&& __m, const allocator_type& __a)
- : __tree_(std::move(__m.__tree_), typename __base::allocator_type(__a)) {
- if (__a != __m.get_allocator()) {
- const_iterator __e = cend();
- while (!__m.empty()) {
- __tree_.__insert_unique_from_orphaned_node(
- __e.__i_, std::move(__m.__tree_.remove(__m.begin().__i_)->__get_value()));
- }
- }
-}
-
template <class _Key, class _Tp, class _Compare, class _Allocator>
_Tp& map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k) {
return __tree_.__emplace_unique(std::piecewise_construct, std::forward_as_tuple(__k), std::forward_as_tuple())
@@ -1685,7 +1670,7 @@ public:
_LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m) = default;
- _LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m, const allocator_type& __a);
+ _LIBCPP_HIDE_FROM_ABI multimap(multimap&& __m, const allocator_type& __a) : __tree_(std::move(__m.__tree_), __a) {}
_LIBCPP_HIDE_FROM_ABI multimap& operator=(multimap&& __m) = default;
@@ -1714,10 +1699,7 @@ public:
_LIBCPP_HIDE_FROM_ABI explicit multimap(const allocator_type& __a) : __tree_(typename __base::allocator_type(__a)) {}
- _LIBCPP_HIDE_FROM_ABI multimap(const multimap& __m, const allocator_type& __a)
- : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a)) {
- insert(__m.begin(), __m.end());
- }
+ _LIBCPP_HIDE_FROM_ABI multimap(const multimap& __m, const allocator_type& __a) : __tree_(__m.__tree_, __a) {}
_LIBCPP_HIDE_FROM_ABI ~multimap() {
static_assert(sizeof(std::__diagnose_non_const_comparator<_Key, _Compare>()), "");
@@ -1992,19 +1974,6 @@ multimap(initializer_list<pair<_Key, _Tp>>, _Allocator)
-> multimap<remove_const_t<_Key>, _Tp, less<remove_const_t<_Key>>, _Allocator>;
# endif
-# ifndef _LIBCPP_CXX03_LANG
-template <class _Key, class _Tp, class _Compare, class _Allocator>
-multimap<_Key, _Tp, _Compare, _Allocator>::multimap(multimap&& __m, const allocator_type& __a)
- : __tree_(std::move(__m.__tree_), typename __base::allocator_type(__a)) {
- if (__a != __m.get_allocator()) {
- const_iterator __e = cend();
- while (!__m.empty())
- __tree_.__insert_multi_from_orphaned_node(
- __e.__i_, std::move(__m.__tree_.remove(__m.begin().__i_)->__get_value()));
- }
-}
-# endif
-
template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI bool
operator==(const multimap<_Key, _Tp, _Compare, _Allocator>& __x, const multimap<_Key, _Tp, _Compare, _Allocator>& __y) {
diff --git a/libcxx/include/set b/libcxx/include/set
index 59ed0155c1def..9c04a58a4ffaa 100644
--- a/libcxx/include/set
+++ b/libcxx/include/set
@@ -673,12 +673,10 @@ public:
_LIBCPP_HIDE_FROM_ABI explicit set(const allocator_type& __a) : __tree_(__a) {}
- _LIBCPP_HIDE_FROM_ABI set(const set& __s, const allocator_type& __a) : __tree_(__s.__tree_.value_comp(), __a) {
- insert(__s.begin(), __s.end());
- }
+ _LIBCPP_HIDE_FROM_ABI set(const set& __s, const allocator_type& __alloc) : __tree_(__s.__tree_, __alloc) {}
# ifndef _LIBCPP_CXX03_LANG
- _LIBCPP_HIDE_FROM_ABI set(set&& __s, const allocator_type& __a);
+ _LIBCPP_HIDE_FROM_ABI set(set&& __s, const allocator_type& __alloc) : __tree_(std::move(__s.__tree_), __alloc) {}
_LIBCPP_HIDE_FROM_ABI set(initializer_list<value_type> __il, const value_compare& __comp = value_compare())
: __tree_(__comp) {
@@ -948,19 +946,6 @@ template <class _Key, class _Allocator, class = enable_if_t<__is_allocator_v<_Al
set(initializer_list<_Key>, _Allocator) -> set<_Key, less<_Key>, _Allocator>;
# endif
-# ifndef _LIBCPP_CXX03_LANG
-
-template <class _Key, class _Compare, class _Allocator>
-set<_Key, _Compare, _Allocator>::set(set&& __s, const allocator_type& __a) : __tree_(std::move(__s.__tree_), __a) {
- if (__a != __s.get_allocator()) {
- const_iterator __e = cend();
- while (!__s.empty())
- insert(__e, std::move(__s.__tree_.remove(__s.begin())->__get_value()));
- }
-}
-
-# endif // _LIBCPP_CXX03_LANG
-
template <class _Key, class _Compare, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI bool
operator==(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) {
@@ -1130,13 +1115,10 @@ public:
# ifndef _LIBCPP_CXX03_LANG
_LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s) = default;
- _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s, const allocator_type& __a);
+ _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s, const allocator_type& __a) : __tree_(std::move(__s.__tree_), __a) {}
# endif // _LIBCPP_CXX03_LANG
_LIBCPP_HIDE_FROM_ABI explicit multiset(const allocator_type& __a) : __tree_(__a) {}
- _LIBCPP_HIDE_FROM_ABI multiset(const multiset& __s, const allocator_type& __a)
- : __tree_(__s.__tree_.value_comp(), __a) {
- insert(__s.begin(), __s.end());
- }
+ _LIBCPP_HIDE_FROM_ABI multiset(const multiset& __s, const allocator_type& __a) : __tree_(__s.__tree_, __a) {}
# ifndef _LIBCPP_CXX03_LANG
_LIBCPP_HIDE_FROM_ABI multiset(initializer_list<value_type> __il, const value_compare& __comp = value_compare())
@@ -1409,20 +1391,6 @@ template <class _Key, class _Allocator, class = enable_if_t<__is_allocator_v<_Al
multiset(initializer_list<_Key>, _Allocator) -> multiset<_Key, less<_Key>, _Allocator>;
# endif
-# ifndef _LIBCPP_CXX03_LANG
-
-template <class _Key, class _Compare, class _Allocator>
-multiset<_Key, _Compare, _Allocator>::multiset(multiset&& __s, const allocator_type& __a)
- : __tree_(std::move(__s.__tree_), __a) {
- if (__a != __s.get_allocator()) {
- const_iterator __e = cend();
- while (!__s.empty())
- insert(__e, std::move(__s.__tree_.remove(__s.begin())->__get_value()));
- }
-}
-
-# endif // _LIBCPP_CXX03_LANG
-
template <class _Key, class _Compare, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI bool
operator==(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) {
diff --git a/libcxx/test/benchmarks/containers/associative/associative_container_benchmarks.h b/libcxx/test/benchmarks/containers/associative/associative_container_benchmarks.h
index 22a6d0d753b0c..f7832a81987ff 100644
--- a/libcxx/test/benchmarks/containers/associative/associative_container_benchmarks.h
+++ b/libcxx/test/benchmarks/containers/associative/associative_container_benchmarks.h
@@ -11,6 +11,7 @@
#include <algorithm>
#include <iterator>
+#include <memory_resource>
#include <random>
#include <string>
#include <ranges>
@@ -33,6 +34,9 @@ struct adapt_operations {
// using InsertionResult = ...;
// static Container::iterator get_iterator(InsertionResult const&);
+
+ // template <class Allocator>
+ // using rebind_alloc = ...;
};
template <class Container>
@@ -103,6 +107,61 @@ void associative_container_benchmarks(std::string container) {
}
});
+ bench("ctor(const&, alloc)", [=](auto& st) {
+ const std::size_t size = st.range(0);
+ std::vector<Value> in = make_value_types(generate_unique_keys(size));
+ Container src(in.begin(), in.end());
+ ScratchSpace c[BatchSize];
+
+ while (st.KeepRunningBatch(BatchSize)) {
+ for (std::size_t i = 0; i != BatchSize; ++i) {
+ new (c + i) Container(src, typename std::allocator<typename Container::value_type>());
+ benchmark::DoNotOptimize(c + i);
+ benchmark::Clo...
[truncated]
|
ldionne
reviewed
Oct 22, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This patch applies the same optimization as implemented in #151304 to the overloads taking an allocator as the second argument.
Apple M4: