Index: lib/CodeGen/CGStmt.cpp
===================================================================
--- lib/CodeGen/CGStmt.cpp
+++ lib/CodeGen/CGStmt.cpp
@@ -1684,7 +1684,8 @@
   if (Info.allowsRegister() || !Info.allowsMemory())
     if (CodeGenFunction::hasScalarEvaluationKind(InputExpr->getType()))
       return EmitScalarExpr(InputExpr);
-
+  if (InputExpr->getStmtClass() == Expr::CXXThisExprClass)
+    return EmitScalarExpr(InputExpr);
   InputExpr = InputExpr->IgnoreParenNoopCasts(getContext());
   LValue Dest = EmitLValue(InputExpr);
   return EmitAsmInputLValue(Info, Dest, InputExpr->getType(), ConstraintStr,
Index: lib/Parse/ParseExprCXX.cpp
===================================================================
--- lib/Parse/ParseExprCXX.cpp
+++ lib/Parse/ParseExprCXX.cpp
@@ -2564,7 +2564,8 @@
     Result.setDestructorName(TildeLoc, Ty, ClassNameLoc);
     return false;
   }
-  
+  if (Tok.is(tok::kw_this))
+    return true;
   Diag(Tok, diag::err_expected_unqualified_id)
     << getLangOpts().CPlusPlus;
   return true;
Index: lib/Parse/ParseStmtAsm.cpp
===================================================================
--- lib/Parse/ParseStmtAsm.cpp
+++ lib/Parse/ParseStmtAsm.cpp
@@ -240,7 +240,10 @@
     Result = Actions.LookupInlineAsmVarDeclField(
         Result.get(), Id->getName(), OffsetUnused, Info, Tok.getLocation());
   }
-
+  if (Tok.is(tok::kw_this)) {
+    Result = ParseCXXThis();
+    Invalid = false;
+  }
   // Figure out how many tokens we are into LineToks.
   unsigned LineIndex = 0;
   if (Tok.is(EndOfStream)) {
Index: test/CodeGen/ms_this.cpp
===================================================================
--- test/CodeGen/ms_this.cpp
+++ test/CodeGen/ms_this.cpp
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -fasm-blocks -emit-llvm %s -o - | FileCheck %s
+class t1 {
+public:
+  double a;
+  void runc();
+};
+
+class t2 {
+public:
+  double a;
+  void runc();
+};
+
+void t2::runc() {
+  double num = 0;
+  __asm {
+       mov rax,[this]
+      //CHECK: %this.addr = alloca %class.t2*
+      //CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}%class.t2* %this1
+       mov rbx,[rax]
+       mov num, rbx
+	   };
+}
+
+void t1::runc() {
+  double num = 0;
+  __asm {
+       mov rax,[this]
+      //CHECK: %this.addr = alloca %class.t1*
+	  //CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}%class.t1* %this1
+       mov rbx,[rax]
+       mov num, rbx
+	   };
+}
+
+struct s {
+  void func() {
+    __asm mov eax, [this]
+    //CHECK: %this.addr = alloca %struct.s*
+	//CHECK: call void asm sideeffect inteldialect "mov eax, qword ptr this"
+  }
+} f3;
+
+int main() {
+  f3.func();
+  return 0;
+}