diff --git a/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp b/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.pass.cpp
@@ -15,39 +15,93 @@
 #include <memory>
 #include <cassert>
 
+#include "test_macros.h"
 #include "count_new.hpp"
 
-int A_constructed = 0;
 
-struct A
-{
-    int data;
-    A() {++A_constructed;}
-    A(const A&) {++A_constructed;}
-    ~A() {--A_constructed;}
+#ifdef TEST_HAS_NO_ALIGNED_ALLOCATION
+static const bool UsingAlignedNew = false;
+#else
+static const bool UsingAlignedNew = true;
+#endif
+
+#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__
+static const size_t MaxAligned = __STDCPP_DEFAULT_NEW_ALIGNMENT__;
+#else
+static const size_t MaxAligned = std::alignment_of<std::max_align_t>::value;
+#endif
+
+static const size_t OverAligned = MaxAligned * 2;
+
+
+template <size_t Align>
+struct TEST_ALIGNAS(Align) AlignedType {
+  char data;
+  static int constructed;
+  AlignedType() { ++constructed; }
+  AlignedType(AlignedType const&) { ++constructed; }
+  ~AlignedType() { --constructed; }
 };
+template <size_t Align>
+int AlignedType<Align>::constructed = 0;
 
-int main()
-{
-    globalMemCounter.reset();
-    std::allocator<A> a;
+
+template <size_t Align>
+void test_aligned() {
+  typedef AlignedType<Align> T;
+  T::constructed = 0;
+  globalMemCounter.reset();
+  std::allocator<T> a;
+  const bool IsOverAlignedType = Align > MaxAligned;
+  const bool ExpectAligned = IsOverAlignedType && UsingAlignedNew;
+  {
     assert(globalMemCounter.checkOutstandingNewEq(0));
-    assert(A_constructed == 0);
+    assert(T::constructed == 0);
     globalMemCounter.last_new_size = 0;
-    A* volatile ap = a.allocate(3);
+    globalMemCounter.last_new_align = 0;
+    T* volatile ap = a.allocate(3);
     assert(globalMemCounter.checkOutstandingNewEq(1));
-    assert(globalMemCounter.checkLastNewSizeEq(3 * sizeof(int)));
-    assert(A_constructed == 0);
+    assert(globalMemCounter.checkNewCalledEq(1));
+    assert(globalMemCounter.checkAlignedNewCalledEq(ExpectAligned));
+    assert(globalMemCounter.checkLastNewSizeEq(3 * sizeof(T)));
+    assert(globalMemCounter.checkLastNewAlignEq(ExpectAligned ? Align : 0));
+    assert(T::constructed == 0);
+    globalMemCounter.last_delete_align = 0;
     a.deallocate(ap, 3);
     assert(globalMemCounter.checkOutstandingNewEq(0));
-    assert(A_constructed == 0);
-
+    assert(globalMemCounter.checkDeleteCalledEq(1));
+    assert(globalMemCounter.checkAlignedDeleteCalledEq(ExpectAligned));
+    assert(globalMemCounter.checkLastDeleteAlignEq(ExpectAligned ? Align : 0));
+    assert(T::constructed == 0);
+  }
+  globalMemCounter.reset();
+  {
     globalMemCounter.last_new_size = 0;
-    A* volatile ap2 = a.allocate(3, (const void*)5);
+    globalMemCounter.last_new_align = 0;
+    T* volatile ap2 = a.allocate(11, (const void*)5);
     assert(globalMemCounter.checkOutstandingNewEq(1));
-    assert(globalMemCounter.checkLastNewSizeEq(3 * sizeof(int)));
-    assert(A_constructed == 0);
-    a.deallocate(ap2, 3);
+    assert(globalMemCounter.checkNewCalledEq(1));
+    assert(globalMemCounter.checkAlignedNewCalledEq(ExpectAligned));
+    assert(globalMemCounter.checkLastNewSizeEq(11 * sizeof(T)));
+    assert(globalMemCounter.checkLastNewAlignEq(ExpectAligned ? Align : 0));
+    assert(T::constructed == 0);
+    globalMemCounter.last_delete_align = 0;
+    a.deallocate(ap2, 11);
     assert(globalMemCounter.checkOutstandingNewEq(0));
-    assert(A_constructed == 0);
+    assert(globalMemCounter.checkDeleteCalledEq(1));
+    assert(globalMemCounter.checkAlignedDeleteCalledEq(ExpectAligned));
+    assert(globalMemCounter.checkLastDeleteAlignEq(ExpectAligned ? Align : 0));
+    assert(T::constructed == 0);
+  }
+}
+
+int main() {
+    test_aligned<1>();
+    test_aligned<2>();
+    test_aligned<4>();
+    test_aligned<8>();
+    test_aligned<16>();
+    test_aligned<MaxAligned>();
+    test_aligned<OverAligned>();
+    test_aligned<OverAligned * 2>();
 }
diff --git a/libcxx/test/support/count_new.hpp b/libcxx/test/support/count_new.hpp
@@ -59,12 +59,20 @@ class MemCounter
     int outstanding_new;
     int new_called;
     int delete_called;
+    int aligned_new_called;
+    int aligned_delete_called;
     std::size_t last_new_size;
+    std::size_t last_new_align;
+    std::size_t last_delete_align;
 
     int outstanding_array_new;
     int new_array_called;
     int delete_array_called;
+    int aligned_new_array_called;
+    int aligned_delete_array_called;
     std::size_t last_new_array_size;
+    std::size_t last_new_array_align;
+    std::size_t last_delete_array_align;
 
 public:
     void newCalled(std::size_t s)
@@ -82,13 +90,25 @@ class MemCounter
         last_new_size = s;
     }
 
+    void alignedNewCalled(std::size_t s, std::size_t a) {
+      newCalled(s);
+      ++aligned_new_called;
+      last_new_align = a;
+    }
+
     void deleteCalled(void * p)
     {
         assert(p);
         --outstanding_new;
         ++delete_called;
     }
 
+    void alignedDeleteCalled(void *p, std::size_t a) {
+      deleteCalled(p);
+      ++aligned_delete_called;
+      last_delete_align = a;
+    }
+
     void newArrayCalled(std::size_t s)
     {
         assert(disable_allocations == false);
@@ -104,13 +124,25 @@ class MemCounter
         last_new_array_size = s;
     }
 
+    void alignedNewArrayCalled(std::size_t s, std::size_t a) {
+      newArrayCalled(s);
+      ++aligned_new_array_called;
+      last_new_array_align = a;
+    }
+
     void deleteArrayCalled(void * p)
     {
         assert(p);
         --outstanding_array_new;
         ++delete_array_called;
     }
 
+    void alignedDeleteArrayCalled(void * p, std::size_t a) {
+      deleteArrayCalled(p);
+      ++aligned_delete_array_called;
+      last_delete_array_align = a;
+    }
+
     void disableAllocations()
     {
         disable_allocations = true;
@@ -121,7 +153,6 @@ class MemCounter
         disable_allocations = false;
     }
 
-
     void reset()
     {
         disable_allocations = false;
@@ -130,12 +161,18 @@ class MemCounter
         outstanding_new = 0;
         new_called = 0;
         delete_called = 0;
+        aligned_new_called = 0;
+        aligned_delete_called = 0;
         last_new_size = 0;
+        last_new_align = 0;
 
         outstanding_array_new = 0;
         new_array_called = 0;
         delete_array_called = 0;
+        aligned_new_array_called = 0;
+        aligned_delete_array_called = 0;
         last_new_array_size = 0;
+        last_new_array_align = 0;
     }
 
 public:
@@ -174,6 +211,31 @@ class MemCounter
         return disable_checking || n != delete_called;
     }
 
+    bool checkAlignedNewCalledEq(int n) const
+    {
+        return disable_checking || n == aligned_new_called;
+    }
+
+    bool checkAlignedNewCalledNotEq(int n) const
+    {
+        return disable_checking || n != aligned_new_called;
+    }
+
+    bool checkAlignedNewCalledGreaterThan(int n) const
+    {
+        return disable_checking || aligned_new_called > n;
+    }
+
+    bool checkAlignedDeleteCalledEq(int n) const
+    {
+        return disable_checking || n == aligned_delete_called;
+    }
+
+    bool checkAlignedDeleteCalledNotEq(int n) const
+    {
+        return disable_checking || n != aligned_delete_called;
+    }
+
     bool checkLastNewSizeEq(std::size_t n) const
     {
         return disable_checking || n == last_new_size;
@@ -184,6 +246,26 @@ class MemCounter
         return disable_checking || n != last_new_size;
     }
 
+    bool checkLastNewAlignEq(std::size_t n) const
+    {
+        return disable_checking || n == last_new_align;
+    }
+
+    bool checkLastNewAlignNotEq(std::size_t n) const
+    {
+        return disable_checking || n != last_new_align;
+    }
+
+    bool checkLastDeleteAlignEq(std::size_t n) const
+    {
+        return disable_checking || n == last_delete_align;
+    }
+
+    bool checkLastDeleteAlignNotEq(std::size_t n) const
+    {
+        return disable_checking || n != last_delete_align;
+    }
+
     bool checkOutstandingArrayNewEq(int n) const
     {
         return disable_checking || n == outstanding_array_new;
@@ -214,6 +296,31 @@ class MemCounter
         return disable_checking || n != delete_array_called;
     }
 
+    bool checkAlignedNewArrayCalledEq(int n) const
+    {
+        return disable_checking || n == aligned_new_array_called;
+    }
+
+    bool checkAlignedNewArrayCalledNotEq(int n) const
+    {
+        return disable_checking || n != aligned_new_array_called;
+    }
+
+    bool checkAlignedNewArrayCalledGreaterThan(int n) const
+    {
+        return disable_checking || aligned_new_array_called > n;
+    }
+
+    bool checkAlignedDeleteArrayCalledEq(int n) const
+    {
+        return disable_checking || n == aligned_delete_array_called;
+    }
+
+    bool checkAlignedDeleteArrayCalledNotEq(int n) const
+    {
+        return disable_checking || n != aligned_delete_array_called;
+    }
+
     bool checkLastNewArraySizeEq(std::size_t n) const
     {
         return disable_checking || n == last_new_array_size;
@@ -223,6 +330,16 @@ class MemCounter
     {
         return disable_checking || n != last_new_array_size;
     }
+
+    bool checkLastNewArrayAlignEq(std::size_t n) const
+    {
+        return disable_checking || n == last_new_array_align;
+    }
+
+    bool checkLastNewArrayAlignNotEq(std::size_t n) const
+    {
+        return disable_checking || n != last_new_array_align;
+    }
 };
 
 #ifdef DISABLE_NEW_COUNT
@@ -254,22 +371,65 @@ void  operator delete(void* p) TEST_NOEXCEPT
     std::free(p);
 }
 
-
 void* operator new[](std::size_t s) TEST_THROW_SPEC(std::bad_alloc)
 {
     getGlobalMemCounter()->newArrayCalled(s);
     return operator new(s);
 }
 
-
 void operator delete[](void* p) TEST_NOEXCEPT
 {
     getGlobalMemCounter()->deleteArrayCalled(p);
     operator delete(p);
 }
 
-#endif // DISABLE_NEW_COUNT
+#ifndef TEST_HAS_NO_ALIGNED_ALLOCATION
+#if defined(_LIBCPP_MSVCRT_LIKE) || \
+  (!defined(_LIBCPP_VERSION) && defined(_WIN32))
+#define USE_ALIGNED_ALLOC
+#endif
 
+void* operator new(std::size_t s, std::align_val_t av) TEST_THROW_SPEC(std::bad_alloc) {
+  const std::size_t a = static_cast<std::size_t>(av);
+  getGlobalMemCounter()->alignedNewCalled(s, a);
+  void *ret;
+#ifdef USE_ALIGNED_ALLOC
+  ret = _aligned_malloc(s, a);
+#else
+  posix_memalign(&ret, a, s);
+#endif
+  if (ret == nullptr)
+    detail::throw_bad_alloc_helper();
+  return ret;
+}
+
+void operator delete(void *p, std::align_val_t av) TEST_NOEXCEPT {
+  const std::size_t a = static_cast<std::size_t>(av);
+  getGlobalMemCounter()->alignedDeleteCalled(p, a);
+  if (p) {
+#ifdef USE_ALIGNED_ALLOC
+    ::_aligned_free(p);
+#else
+    ::free(p);
+#endif
+  }
+}
+
+void* operator new[](std::size_t s, std::align_val_t av) TEST_THROW_SPEC(std::bad_alloc) {
+  const std::size_t a = static_cast<std::size_t>(av);
+  getGlobalMemCounter()->alignedNewArrayCalled(s, a);
+  return operator new(s, av);
+}
+
+void operator delete[](void *p, std::align_val_t av) TEST_NOEXCEPT {
+  const std::size_t a = static_cast<std::size_t>(av);
+  getGlobalMemCounter()->alignedDeleteArrayCalled(p, a);
+  return operator delete(p, av);
+}
+
+#endif // TEST_HAS_NO_ALIGNED_ALLOCATION
+
+#endif // DISABLE_NEW_COUNT
 
 struct DisableAllocationGuard {
     explicit DisableAllocationGuard(bool disable = true) : m_disabled(disable)
@@ -295,7 +455,6 @@ struct DisableAllocationGuard {
     DisableAllocationGuard& operator=(DisableAllocationGuard const&);
 };
 
-
 struct RequireAllocationGuard {
     explicit RequireAllocationGuard(std::size_t RequireAtLeast = 1)
             : m_req_alloc(RequireAtLeast),

diff --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
@@ -157,6 +157,11 @@
 #define TEST_NORETURN [[noreturn]]
 #endif
 
+#if !defined(__cpp_aligned_new) || __cpp_aligned_new < 201606L || \
+    defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
+#define TEST_HAS_NO_ALIGNED_ALLOCATION
+#endif
+
 #if defined(_LIBCPP_SAFE_STATIC)
 #define TEST_SAFE_STATIC _LIBCPP_SAFE_STATIC
 #else
@@ -228,6 +233,7 @@ inline void DoNotOptimize(Tp const& value) {
 }
 #endif
 
+
 #if defined(__GNUC__)
 #pragma GCC diagnostic pop
 #endif