1 files changed, 65 insertions, 8 deletions

diff --git a/contrib/llvm-project/libcxx/include/__algorithm/pstl_copy.h b/contrib/llvm-project/libcxx/include/__algorithm/pstl_copy.h
index 83c712c35407..19f275a0d5d9 100644
--- a/contrib/llvm-project/libcxx/include/__algorithm/pstl_copy.h
+++ b/contrib/llvm-project/libcxx/include/__algorithm/pstl_copy.h
@@ -10,15 +10,19 @@
 #define _LIBCPP___ALGORITHM_PSTL_COPY_H
 
 #include <__algorithm/copy_n.h>
+#include <__algorithm/pstl_backend.h>
+#include <__algorithm/pstl_frontend_dispatch.h>
 #include <__algorithm/pstl_transform.h>
 #include <__config>
 #include <__functional/identity.h>
-#include <__iterator/iterator_traits.h>
+#include <__iterator/concepts.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/is_constant_evaluated.h>
 #include <__type_traits/is_execution_policy.h>
 #include <__type_traits/is_trivially_copyable.h>
 #include <__type_traits/remove_cvref.h>
+#include <__utility/move.h>
+#include <optional>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -30,26 +34,79 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 // TODO: Use the std::copy/move shenanigans to forward to std::memmove
 
+template <class>
+void __pstl_copy();
+
 template <class _ExecutionPolicy,
           class _ForwardIterator,
           class _ForwardOutIterator,
-          enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator>
+__copy(_ExecutionPolicy&& __policy,
+       _ForwardIterator&& __first,
+       _ForwardIterator&& __last,
+       _ForwardOutIterator&& __result) noexcept {
+  return std::__pstl_frontend_dispatch(
+      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_copy, _RawPolicy),
+      [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _ForwardOutIterator __g_result) {
+        return std::__transform(__policy, __g_first, __g_last, __g_result, __identity());
+      },
+      std::move(__first),
+      std::move(__last),
+      std::move(__result));
+}
+
+template <class _ExecutionPolicy,
+          class _ForwardIterator,
+          class _ForwardOutIterator,
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
 copy(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _ForwardOutIterator __result) {
-  return std::transform(__policy, __first, __last, __result, __identity());
+  auto __res = std::__copy(__policy, std::move(__first), std::move(__last), std::move(__result));
+  if (!__res)
+    std::__throw_bad_alloc();
+  return *std::move(__res);
+}
+
+template <class>
+void __pstl_copy_n();
+
+template <class _ExecutionPolicy,
+          class _ForwardIterator,
+          class _ForwardOutIterator,
+          class _Size,
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator> __copy_n(
+    _ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __n, _ForwardOutIterator&& __result) noexcept {
+  return std::__pstl_frontend_dispatch(
+      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_copy_n, _RawPolicy),
+      [&__policy](
+          _ForwardIterator __g_first, _Size __g_n, _ForwardOutIterator __g_result) -> optional<_ForwardIterator> {
+        if constexpr (__has_random_access_iterator_category_or_concept<_ForwardIterator>::value)
+          return std::__copy(__policy, std::move(__g_first), std::move(__g_first + __g_n), std::move(__g_result));
+        else
+          return std::copy_n(__g_first, __g_n, __g_result);
+      },
+      std::move(__first),
+      std::move(__n),
+      std::move(__result));
 }
 
 template <class _ExecutionPolicy,
           class _ForwardIterator,
           class _ForwardOutIterator,
           class _Size,
-          enable_if_t<is_execution_policy_v<__remove_cvref_t<_ExecutionPolicy>>, int> = 0>
+          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
+          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
 copy_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _ForwardOutIterator __result) {
-  if constexpr (__has_random_access_iterator_category<_ForwardIterator>::value)
-    return std::copy(__policy, __first, __first + __n, __result);
-  else
-    return std::copy_n(__first, __n, __result);
+  auto __res = std::__copy_n(__policy, std::move(__first), std::move(__n), std::move(__result));
+  if (!__res)
+    std::__throw_bad_alloc();
+  return *std::move(__res);
 }
 
 _LIBCPP_END_NAMESPACE_STD