diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
@@ -1743,12 +1743,13 @@ QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
 }
 
 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
-                                  unsigned CVRA, const DeclSpec *DS) {
+                                  unsigned CVRAU, const DeclSpec *DS) {
   if (T.isNull())
     return QualType();
 
-  // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic.
-  unsigned CVR = CVRA & ~DeclSpec::TQ_atomic;
+  // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
+  // TQ_unaligned;
+  unsigned CVR = CVRAU & ~DeclSpec::TQ_atomic & ~DeclSpec::TQ_unaligned;
 
   // C11 6.7.3/5:
   //   If the same qualifier appears more than once in the same
@@ -1758,7 +1759,7 @@ QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
   // It's not specified what happens when the _Atomic qualifier is applied to
   // a type specified with the _Atomic specifier, but we assume that this
   // should be treated as if the _Atomic qualifier appeared multiple times.
-  if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) {
+  if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
     // C11 6.7.3/5:
     //   If other qualifiers appear along with the _Atomic qualifier in a
     //   specifier-qualifier-list, the resulting type is the so-qualified
@@ -1775,7 +1776,9 @@ QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
     return BuildQualifiedType(T, Loc, Split.Quals);
   }
 
-  return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS);
+  Qualifiers Q = Qualifiers::fromCVRMask(CVR);
+  Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
+  return BuildQualifiedType(T, Loc, Q, DS);
 }
 
 /// \brief Build a paren type including \p T.
@@ -2617,28 +2620,30 @@ void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
                                      SourceLocation ConstQualLoc,
                                      SourceLocation VolatileQualLoc,
                                      SourceLocation RestrictQualLoc,
-                                     SourceLocation AtomicQualLoc) {
+                                     SourceLocation AtomicQualLoc,
+                                     SourceLocation UnalignedQualLoc) {
   if (!Quals)
     return;
 
   struct Qual {
     const char *Name;
     unsigned Mask;
     SourceLocation Loc;
-  } const QualKinds[4] = {
+  } const QualKinds[5] = {
     { "const", DeclSpec::TQ_const, ConstQualLoc },
     { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
     { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
-    { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
+    { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc },
+    { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc }
   };
 
   SmallString<32> QualStr;
   unsigned NumQuals = 0;
   SourceLocation Loc;
-  FixItHint FixIts[4];
+  FixItHint FixIts[5];
 
   // Build a string naming the redundant qualifiers.
-  for (unsigned I = 0; I != 4; ++I) {
+  for (unsigned I = 0; I != 5; ++I) {
     if (Quals & QualKinds[I].Mask) {
       if (!QualStr.empty()) QualStr += ' ';
       QualStr += QualKinds[I].Name;
@@ -2690,7 +2695,8 @@ static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
           SourceLocation::getFromRawEncoding(PTI.ConstQualLoc),
           SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc),
           SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc),
-          SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc));
+          SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc),
+          SourceLocation::getFromRawEncoding(PTI.UnalignedQualLoc));
       return;
     }
 
@@ -2726,7 +2732,8 @@ static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
                               D.getDeclSpec().getConstSpecLoc(),
                               D.getDeclSpec().getVolatileSpecLoc(),
                               D.getDeclSpec().getRestrictSpecLoc(),
-                              D.getDeclSpec().getAtomicSpecLoc());
+                              D.getDeclSpec().getAtomicSpecLoc(),
+                              D.getDeclSpec().getUnalignedSpecLoc());
 }
 
 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,

diff --git a/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp b/clang/test/CodeGenCXX/mangle-ms-cxx11.cpp
@@ -293,3 +293,14 @@ int PR26105() {
 }
 // CHECK-DAG: @"\01??R<lambda_0>@?0??PR26105@@YAHXZ@QBE@H@Z"
 // CHECK-DAG: @"\01??R<lambda_1>@?0???R<lambda_0>@?0??PR26105@@YAHXZ@QBE@H@Z@QBE@H@Z"
+
+int __unaligned * unaligned_foo1() { return 0; }
+int __unaligned * __unaligned * unaligned_foo2() { return 0; }
+__unaligned int unaligned_foo3() { return 0; }
+void unaligned_foo4(int __unaligned *p1) {}
+
+// CHECK-DAG: @"\01?unaligned_foo1@@YAPFAHXZ"
+// CHECK-DAG: @"\01?unaligned_foo2@@YAPFAPFAHXZ"
+// CHECK-DAG: @"\01?unaligned_foo3@@YAHXZ"
+// CHECK-DAG: @"\01?unaligned_foo4@@YAXPFAH@Z"
+
diff --git a/clang/test/Sema/MicrosoftExtensions.c b/clang/test/Sema/MicrosoftExtensions.c
@@ -170,3 +170,11 @@ void myprintf(const char *f, ...) {
     __va_start(ap, f); // expected-warning {{incompatible pointer types passing 'my_va_list'}}
   }
 }
+
+// __unaligned handling
+void test_unaligned() {
+  __unaligned int *p1 = 0;
+  int *p2 = p1; // expected-warning {{initializing 'int *' with an expression of type '__unaligned int *' discards qualifiers}}
+  __unaligned int *p3 = p2;
+}
+
diff --git a/clang/test/Sema/address_spaces.c b/clang/test/Sema/address_spaces.c
@@ -20,7 +20,7 @@ void foo(_AS3 float *a,
   _AS1 int arrarr[5][5]; // expected-error {{automatic variable qualified with an address space}}
 
   __attribute__((address_space(-1))) int *_boundsA; // expected-error {{address space is negative}}
-  __attribute__((address_space(0xFFFFFF))) int *_boundsB;
+  __attribute__((address_space(0x7FFFFF))) int *_boundsB;
   __attribute__((address_space(0x1000000))) int *_boundsC; // expected-error {{address space is larger than the maximum supported}}
   // chosen specifically to overflow 32 bits and come out reasonable
   __attribute__((address_space(4294967500))) int *_boundsD; // expected-error {{address space is larger than the maximum supported}}
@@ -71,4 +71,4 @@ __attribute__((address_space("12"))) int *i; // expected-error {{'address_space'
 // Clang extension doesn't forbid operations on pointers to different address spaces.
 char* cmp(_AS1 char *x,  _AS2 char *y) {
   return x < y ? x : y; // expected-warning {{pointer type mismatch ('__attribute__((address_space(1))) char *' and '__attribute__((address_space(2))) char *')}}
-}
+}
diff --git a/clang/test/Sema/invalid-assignment-constant-address-space.c b/clang/test/Sema/invalid-assignment-constant-address-space.c
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
 
-#define OPENCL_CONSTANT 16776962
+#define OPENCL_CONSTANT 8388354
 int __attribute__((address_space(OPENCL_CONSTANT))) c[3] = {0};
 
 void foo() {

diff --git a/clang/test/SemaCXX/MicrosoftExtensions.cpp b/clang/test/SemaCXX/MicrosoftExtensions.cpp
@@ -1,5 +1,7 @@
-// RUN: %clang_cc1 %s -triple i686-pc-win32 -fsyntax-only -Wmicrosoft -Wc++11-extensions -Wno-long-long -verify -fms-extensions -fexceptions -fcxx-exceptions
+// RUN: %clang_cc1 %s -triple i686-pc-win32 -fsyntax-only -Wmicrosoft -Wc++11-extensions -Wno-long-long -verify -fms-extensions -fexceptions -fcxx-exceptions -DTEST1
+// RUN: %clang_cc1 %s -triple i686-pc-win32 -fsyntax-only -Wmicrosoft -Wc++11-extensions -Wno-long-long -verify -fexceptions -fcxx-exceptions -DTEST2
 
+#if TEST1
 
 // Microsoft doesn't validate exception specification.
 namespace microsoft_exception_spec {
@@ -80,7 +82,32 @@ struct M {
 // __unaligned handling
 typedef char __unaligned *aligned_type;
 typedef struct UnalignedTag { int f; } __unaligned *aligned_type2;
+typedef char __unaligned aligned_type3;
 
+// Check that __unaligned qualifier can be used for overloading
+void foo_unaligned(int *arg) {}
+void foo_unaligned(__unaligned int *arg) {}
+void foo_unaligned(int arg) {} // expected-note {{previous definition is here}}
+void foo_unaligned(__unaligned int arg) {} // expected-error {{redefinition of 'foo_unaligned'}}
+class A_unaligned {};
+class B_unaligned : public A_unaligned {};
+int foo_unaligned(__unaligned A_unaligned *arg) { return 0; }
+void *foo_unaligned(B_unaligned *arg) { return 0; }
+
+void test_unaligned() {
+  int *p1 = 0;
+  foo_unaligned(p1);
+
+  __unaligned int *p2 = 0;
+  foo_unaligned(p2);
+
+  __unaligned B_unaligned *p3 = 0;
+  int p4 = foo_unaligned(p3);
+
+  B_unaligned *p5 = p3; // expected-error {{cannot initialize a variable of type 'B_unaligned *' with an lvalue of type '__unaligned B_unaligned *'}}
+
+  __unaligned B_unaligned *p6 = p3;
+}
 
 template<typename T> void h1(T (__stdcall M::* const )()) { }
 
@@ -420,3 +447,15 @@ struct S {
 
 int S::fn() { return 0; } // expected-warning {{is missing exception specification}}
 }
+
+#elif TEST2
+
+// Check that __unaligned is not recognized if MS extensions are not enabled
+typedef char __unaligned *aligned_type; // expected-error {{expected ';' after top level declarator}}
+
+#else
+
+#error Unknown test mode
+
+#endif
+