diff --git a/libcxx/.clang-format b/libcxx/.clang-format
--- a/libcxx/.clang-format
+++ b/libcxx/.clang-format
@@ -68,7 +68,7 @@
 NamespaceIndentation: Inner
 PackConstructorInitializers: NextLine
 
-PenaltyIndentedWhitespace: 61
+PenaltyIndentedWhitespace: 2
 
 Language: Cpp
 Standard: c++20
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -154,6 +154,7 @@
   __algorithm/unique.h
   __algorithm/unique_copy.h
   __algorithm/unwrap_iter.h
+  __algorithm/unwrap_range.h
   __algorithm/upper_bound.h
   __assert
   __availability
diff --git a/libcxx/include/__algorithm/copy.h b/libcxx/include/__algorithm/copy.h
--- a/libcxx/include/__algorithm/copy.h
+++ b/libcxx/include/__algorithm/copy.h
@@ -10,6 +10,7 @@
 #define _LIBCPP___ALGORITHM_COPY_H
 
 #include <__algorithm/unwrap_iter.h>
+#include <__algorithm/unwrap_range.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
@@ -88,10 +89,11 @@
                      && is_copy_constructible<_Sent>::value
                      && is_copy_constructible<_OutIter>::value, int> = 0>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
-pair<_InIter, _OutIter>
-__copy(_InIter __first, _Sent __last, _OutIter __result) {
-  auto __ret = std::__copy_impl(std::__unwrap_iter(__first), std::__unwrap_iter(__last), std::__unwrap_iter(__result));
-  return std::make_pair(std::__rewrap_iter(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
+pair<_InIter, _OutIter> __copy(_InIter __first, _Sent __last, _OutIter __result) {
+  auto __range = std::__unwrap_range(__first, __last);
+  auto __ret   = std::__copy_impl(std::move(__range.first), std::move(__range.second), std::__unwrap_iter(__result));
+  return std::make_pair(
+      std::__rewrap_range<_Sent>(__first, __ret.first), std::__rewrap_iter(__result, __ret.second));
 }
 
 template <class _InputIterator, class _OutputIterator>
diff --git a/libcxx/include/__algorithm/set_intersection.h b/libcxx/include/__algorithm/set_intersection.h
--- a/libcxx/include/__algorithm/set_intersection.h
+++ b/libcxx/include/__algorithm/set_intersection.h
@@ -14,6 +14,7 @@
 #include <__algorithm/iterator_operations.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__iterator/next.h>
 #include <__utility/move.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/libcxx/include/__algorithm/unwrap_iter.h b/libcxx/include/__algorithm/unwrap_iter.h
--- a/libcxx/include/__algorithm/unwrap_iter.h
+++ b/libcxx/include/__algorithm/unwrap_iter.h
@@ -12,6 +12,7 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__memory/pointer_traits.h>
+#include <__utility/move.h>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -20,77 +21,50 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-// The job of __unwrap_iter is to lower contiguous iterators (such as
-// vector<T>::iterator) into pointers, to reduce the number of template
-// instantiations and to enable pointer-based optimizations e.g. in std::copy.
-// For iterators that are not contiguous, it must be a no-op.
+// TODO: Change the name of __unwrap_iter_impl to something more appropriate
+// The job of __unwrap_iter is to remove iterator wrappers (like reverse_iterator or __wrap_iter),
+// to reduce the number of template instantiations and to enable pointer-based optimizations e.g. in std::copy.
 // In debug mode, we don't do this.
 //
-// __unwrap_iter is non-constexpr for user-defined iterators whose
-// `to_address` and/or `operator->` is non-constexpr. This is okay; but we
-// try to avoid doing __unwrap_iter in constant-evaluated contexts anyway.
-//
 // Some algorithms (e.g. std::copy, but not std::sort) need to convert an
-// "unwrapped" result back into a contiguous iterator. Since contiguous iterators
-// are random-access, we can do this portably using iterator arithmetic; this
-// is the job of __rewrap_iter.
+// "unwrapped" result back into the original iterator type. Doing that is the job of __rewrap_iter.
 
+// Default case - we can't unwrap anything
 template <class _Iter, bool = __is_cpp17_contiguous_iterator<_Iter>::value>
 struct __unwrap_iter_impl {
-    static _LIBCPP_CONSTEXPR _Iter
-    __apply(_Iter __i) _NOEXCEPT {
-        return __i;
-    }
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap(_Iter, _Iter __iter) { return __iter; }
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __unwrap(_Iter __i) _NOEXCEPT { return __i; }
 };
 
 #ifndef _LIBCPP_ENABLE_DEBUG_MODE
 
+// It's a contiguous iterator, so we can use a raw pointer instead
 template <class _Iter>
 struct __unwrap_iter_impl<_Iter, true> {
-    static _LIBCPP_CONSTEXPR decltype(_VSTD::__to_address(declval<_Iter>()))
-    __apply(_Iter __i) _NOEXCEPT {
-        return _VSTD::__to_address(__i);
-    }
-};
+  using _ToAddressT = decltype(std::__to_address(std::declval<_Iter>()));
 
-#endif // !_LIBCPP_ENABLE_DEBUG_MODE
-
-template<class _Iter, class _Impl = __unwrap_iter_impl<_Iter> >
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-decltype(_Impl::__apply(declval<_Iter>()))
-__unwrap_iter(_Iter __i) _NOEXCEPT
-{
-    return _Impl::__apply(__i);
-}
-
-template <class _OrigIter, class _UnwrappedIter>
-struct __rewrap_iter_impl {
-  static _LIBCPP_CONSTEXPR _OrigIter __apply(_OrigIter __first, _UnwrappedIter __result) {
-    // Precondition: __result is reachable from __first
-    // Precondition: _OrigIter is a contiguous iterator
-    return __first + (__result - std::__unwrap_iter(__first));
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap(_Iter __orig_iter, _ToAddressT __unwrapped_iter) {
+    return __orig_iter + (__unwrapped_iter - std::__to_address(__orig_iter));
   }
-};
 
-template <class _OrigIter>
-struct __rewrap_iter_impl<_OrigIter, _OrigIter> {
-  static _LIBCPP_CONSTEXPR _OrigIter __apply(_OrigIter, _OrigIter __result) {
-    return __result;
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToAddressT __unwrap(_Iter __i) _NOEXCEPT {
+    return std::__to_address(__i);
   }
 };
 
-template<class _OrigIter>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-_OrigIter __rewrap_iter(_OrigIter, _OrigIter __result)
-{
-    return __result;
+#endif // !_LIBCPP_ENABLE_DEBUG_MODE
+
+template<class _Iter,
+         class _Impl = __unwrap_iter_impl<_Iter>,
+         __enable_if_t<is_copy_constructible<_Iter>::value, int> = 0>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
+decltype(_Impl::__unwrap(std::declval<_Iter>())) __unwrap_iter(_Iter __i) _NOEXCEPT {
+  return _Impl::__unwrap(__i);
 }
 
-template<class _OrigIter, class _UnwrappedIter, class _Impl = __rewrap_iter_impl<_OrigIter, _UnwrappedIter> >
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
-_OrigIter __rewrap_iter(_OrigIter __first, _UnwrappedIter __result)
-{
-  return _Impl::__apply(__first, __result);
+template <class _OrigIter, class _Iter, class _Impl = __unwrap_iter_impl<_OrigIter> >
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _OrigIter __rewrap_iter(_OrigIter __orig_iter, _Iter __iter) _NOEXCEPT {
+  return _Impl::__rewrap(std::move(__orig_iter), std::move(__iter));
 }
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/include/__algorithm/unwrap_range.h b/libcxx/include/__algorithm/unwrap_range.h
new file mode 100644
--- /dev/null
+++ b/libcxx/include/__algorithm/unwrap_range.h
@@ -0,0 +1,88 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_UNWRAP_RANGE_H
+#define _LIBCPP___ALGORITHM_UNWRAP_RANGE_H
+
+#include <__algorithm/unwrap_iter.h>
+#include <__concepts/constructible.h>
+#include <__config>
+#include <__iterator/concepts.h>
+#include <__iterator/next.h>
+#include <__utility/declval.h>
+#include <__utility/move.h>
+#include <__utility/pair.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER > 17
+template <class _Iter, class _Sent>
+struct __unwrap_range_impl {
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __sent)
+    requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
+  {
+    auto __last = ranges::next(__first, __sent);
+    return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __last) {
+    return pair{std::move(__first), std::move(__last)};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto
+  __rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter)
+    requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
+  {
+    return std::__rewrap_iter(__orig_iter, __iter);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto __rewrap(_Iter, _Iter __iter) { return __iter; }
+};
+
+template <class _Iter>
+struct __unwrap_range_impl<_Iter, _Iter> {
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Iter __last) {
+    return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI static constexpr auto
+  __rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter) {
+    return std::__rewrap_iter(__orig_iter, __iter);
+  }
+};
+
+template <class _Iter, class _Sent>
+_LIBCPP_HIDE_FROM_ABI constexpr auto __unwrap_range(_Iter __first, _Sent __last) {
+  return __unwrap_range_impl<_Iter, _Sent>::__unwrap(std::move(__first), std::move(__last));
+}
+
+template <class _Sent,
+          class _Iter,
+          class _Unwrapped = decltype(std::__unwrap_range(std::declval<_Iter>(), std::declval<_Sent>()))>
+_LIBCPP_HIDE_FROM_ABI constexpr _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
+  return __unwrap_range_impl<_Iter, _Sent>::__rewrap(std::move(__orig_iter), std::move(__iter));
+}
+#else
+template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR pair<_Unwrapped, _Unwrapped> __unwrap_range(_Iter __first, _Iter __last) {
+  return std::make_pair(std::__unwrap_iter(__first), std::__unwrap_iter(__last));
+}
+
+template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
+  return std::__rewrap_iter(__orig_iter, __iter);
+}
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_UNWRAP_RANGE_H
diff --git a/libcxx/include/__iterator/reverse_iterator.h b/libcxx/include/__iterator/reverse_iterator.h
--- a/libcxx/include/__iterator/reverse_iterator.h
+++ b/libcxx/include/__iterator/reverse_iterator.h
@@ -332,41 +332,16 @@
 
 template <class _Iter, bool __b>
 struct __unwrap_iter_impl<_ReverseWrapper<_Iter>, __b> {
-  static _LIBCPP_CONSTEXPR decltype(std::__unwrap_iter(std::declval<_Iter>()))
-  __apply(_ReverseWrapper<_Iter> __i) _NOEXCEPT {
-    return std::__unwrap_iter(__i.base().base());
-  }
-};
-
-template <class _OrigIter, class _UnwrappedIter>
-struct __rewrap_iter_impl<_ReverseWrapper<_OrigIter>, _UnwrappedIter> {
-  template <class _Iter>
-  struct _ReverseWrapperCount {
-    static _LIBCPP_CONSTEXPR const size_t value = 1;
-  };
-
-  template <class _Iter>
-  struct _ReverseWrapperCount<_ReverseWrapper<_Iter> > {
-    static _LIBCPP_CONSTEXPR const size_t value = 1 + _ReverseWrapperCount<_Iter>::value;
-  };
-
-  template <size_t _RewrapCount, class _OIter, class _UIter, __enable_if_t<_RewrapCount != 0, int> = 0>
-  _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _ReverseWrapper<_OIter> __rewrap(_ReverseWrapper<_OIter> __iter1,
-                                                                                  _UIter __iter2) {
-    return _ReverseWrapper<_OIter>(
-        reverse_iterator<_OIter>(__rewrap<_RewrapCount - 1>(__iter1.base().base(), __iter2)));
-  }
+  using _UnwrappedIter = decltype(__unwrap_iter_impl<_Iter>::__unwrap(std::declval<_Iter>()));
 
-  template <size_t _RewrapCount, class _OIter, class _UIter, __enable_if_t<_RewrapCount == 0, int> = 0>
-  _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR decltype(std::__rewrap_iter(std::declval<_OIter>(),
-                                                                             std::declval<_UIter>()))
-  __rewrap(_OIter __iter1, _UIter __iter2) {
-    return std::__rewrap_iter(__iter1, __iter2);
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ReverseWrapper<_Iter>
+  __rewrap(_ReverseWrapper<_Iter> __orig_iter, _UnwrappedIter __unwrapped_iter) {
+    return _ReverseWrapper<_Iter>(
+        reverse_iterator<_Iter>(__unwrap_iter_impl<_Iter>::__rewrap(__orig_iter.base().base(), __unwrapped_iter)));
   }
 
-  _LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _ReverseWrapper<_OrigIter> __apply(_ReverseWrapper<_OrigIter> __iter1,
-                                                                                    _UnwrappedIter __iter2) {
-    return __rewrap<_ReverseWrapperCount<_OrigIter>::value>(__iter1, __iter2);
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _UnwrappedIter __unwrap(_ReverseWrapper<_Iter> __i) _NOEXCEPT {
+    return __unwrap_iter_impl<_Iter>::__unwrap(__i.base().base());
   }
 };
 
diff --git a/libcxx/test/libcxx/private_headers.verify.cpp b/libcxx/test/libcxx/private_headers.verify.cpp
--- a/libcxx/test/libcxx/private_headers.verify.cpp
+++ b/libcxx/test/libcxx/private_headers.verify.cpp
@@ -191,6 +191,7 @@
 #include <__algorithm/unique.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unique.h'}}
 #include <__algorithm/unique_copy.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unique_copy.h'}}
 #include <__algorithm/unwrap_iter.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unwrap_iter.h'}}
+#include <__algorithm/unwrap_range.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/unwrap_range.h'}}
 #include <__algorithm/upper_bound.h> // expected-error@*:* {{use of private header from outside its module: '__algorithm/upper_bound.h'}}
 #include <__availability> // expected-error@*:* {{use of private header from outside its module: '__availability'}}
 #include <__bit/bit_cast.h> // expected-error@*:* {{use of private header from outside its module: '__bit/bit_cast.h'}}
diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.copy/ranges.copy.pass.cpp
@@ -95,13 +95,20 @@
   }
 }
 
+template <class In, class Out>
+constexpr void test_sentinels() {
+  test_iterators<In, Out>();
+  test_iterators<In, Out, sized_sentinel<In>>();
+  test_iterators<In, Out, sentinel_wrapper<In>>();
+}
+
 template <class Out>
 constexpr void test_in_iterators() {
   test_iterators<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
-  test_iterators<forward_iterator<int*>, Out>();
-  test_iterators<bidirectional_iterator<int*>, Out>();
-  test_iterators<random_access_iterator<int*>, Out>();
-  test_iterators<contiguous_iterator<int*>, Out>();
+  test_sentinels<forward_iterator<int*>, Out>();
+  test_sentinels<bidirectional_iterator<int*>, Out>();
+  test_sentinels<random_access_iterator<int*>, Out>();
+  test_sentinels<contiguous_iterator<int*>, Out>();
 }
 
 template <class Out>
diff --git a/libcxx/utils/libcxx/test/params.py b/libcxx/utils/libcxx/test/params.py
--- a/libcxx/utils/libcxx/test/params.py
+++ b/libcxx/utils/libcxx/test/params.py
@@ -38,6 +38,9 @@
   # TODO(mordante) investigate a solution for this issue.
   '-Wno-tautological-compare',
 
+  # -Wstringop-overread seems to be a bit buggy currently
+  '-Wno-stringop-overread',
+
   # These warnings should be enabled in order to support the MSVC
   # team using the test suite; They enable the warnings below and
   # expect the test suite to be clean.