Index: libcxx/include/experimental/simd
===================================================================
--- libcxx/include/experimental/simd
+++ libcxx/include/experimental/simd
@@ -1219,6 +1219,11 @@
     return *this;
   }
 
+  template <class _Up>
+  __simd_reference operator=(__simd_reference<_Vp, _Up, _Abi>&& __ref) && {
+    return std::move(*this) = _Vp(__ref);
+  }
+
   __simd_reference operator++() && {
     return std::move(*this) = __ptr_->__get(__index_) + 1;
   }
@@ -1288,6 +1293,22 @@
     return std::move(*this) =
                __from_value_type(__ptr_->__get(__index_) ^ __val);
   }
+
+  friend void swap(__simd_reference&& a, __simd_reference&& b) noexcept {
+    _Vp __val = std::move(b);
+    std::move(b) = std::move(a);
+    std::move(a) = __val;
+  }
+
+  friend void swap(_Vp& a, __simd_reference&& b) noexcept {
+    swap(std::move(b), a);
+  }
+
+  friend void swap(__simd_reference&& a, _Vp& b) noexcept {
+    _Vp __val = b;
+    b = std::move(a);
+    std::move(a) = __val;
+  }
 };
 
 template <class _To, class _From>
Index: libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
===================================================================
--- libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
+++ libcxx/test/std/experimental/simd/simd.access/default.pass.cpp
@@ -77,6 +77,12 @@
       assert(c[1] == 42);
     }
 
+    {
+      auto c = a;
+      c[0] = b[0];
+      assert(c[0] == 4);
+      assert(c[1] == 42);
+    }
     {
       auto c = a;
       c[0] += b[0];
@@ -137,7 +143,30 @@
       assert(c[0] == (42 ^ 4));
       assert(c[1] == 42);
     }
-
+    {
+      auto aa = a, bb = b;
+      swap(aa[0], bb[0]);
+      assert(aa[0] == 4);
+      assert(bb[0] == 42);
+      assert(aa[1] == 42);
+      assert(bb[1] == 4);
+    }
+    {
+      auto c = a;
+      int d = 4;
+      swap(c[0], d);
+      assert(c[0] == 4);
+      assert(d == 42);
+      assert(c[1] == 42);
+    }
+    {
+      auto c = a;
+      int d = 4;
+      swap(d, c[0]);
+      assert(c[0] == 4);
+      assert(d == 42);
+      assert(c[1] == 42);
+    }
     {
       auto c = a;
       (void)(a[0] + (c[0] += a[0]));
Index: libcxx/test/std/experimental/simd/simd.mask.access/default.pass.cpp
===================================================================
--- libcxx/test/std/experimental/simd/simd.mask.access/default.pass.cpp
+++ libcxx/test/std/experimental/simd/simd.mask.access/default.pass.cpp
@@ -76,6 +76,12 @@
       assert(bool(c[1]) == false);
     }
 
+    {
+      auto c = a;
+      c[0] = b[0];
+      assert(bool(c[0]) == true);
+      assert(bool(c[1]) == false);
+    }
     {
       auto c = a;
       c[0] += b[0];
@@ -136,6 +142,30 @@
       assert(bool(c[0]) == true);
       assert(bool(c[1]) == false);
     }
+    {
+      auto aa = a, bb = b;
+      swap(aa[0], bb[0]);
+      assert(aa[0] == true);
+      assert(bb[0] == false);
+      assert(aa[1] == false);
+      assert(bb[1] == true);
+    }
+    {
+      auto c = a;
+      bool d = true;
+      swap(c[0], d);
+      assert(c[0] == true);
+      assert(d == false);
+      assert(c[1] == false);
+    }
+    {
+      auto c = a;
+      bool d = true;
+      swap(d, c[0]);
+      assert(c[0] == true);
+      assert(d == false);
+      assert(c[1] == false);
+    }
 
     {
       auto c = a;