Index: clang/include/clang/AST/Expr.h
===================================================================
--- clang/include/clang/AST/Expr.h
+++ clang/include/clang/AST/Expr.h
@@ -3546,6 +3546,21 @@
   CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; }
   void setCastKind(CastKind K) { CastExprBits.Kind = K; }
 
+  /// Return
+  //  True : If the cast expr has the volatileness in the cast node path and
+  //         DeclRefExprNode not has the volatile qualfiler like
+  //  |-ImplicitCastExpr 'int' <LValueToRValue>
+  //  | `-CXXStaticCastExpr 'volatile int' lvalue static_cast<volatile int &>
+  //  |   `-ImplicitCastExpr  'volatile int' lvalue <NoOp> part_of_explicit_cast
+  //  |     `-DeclRefExpr 'int' lvalue Var 'x' 'int'
+  //  False :  Otherwise.
+  bool isDeclRefExprNodeNotVolatile() {
+       return (this->isGLValue() &&
+               (this->getType().isVolatileQualified() !=
+	       this->getSubExprAsWritten()->getType().isVolatileQualified()));
+  }
+
+
   static const char *getCastKindName(CastKind CK);
   const char *getCastKindName() const { return getCastKindName(getCastKind()); }
 
Index: clang/lib/CodeGen/CGExpr.cpp
===================================================================
--- clang/lib/CodeGen/CGExpr.cpp
+++ clang/lib/CodeGen/CGExpr.cpp
@@ -4805,6 +4805,9 @@
     // bound and change the IR type.
     // FIXME: Once pointee types are removed from IR, remove this.
     LValue LV = EmitLValue(E->getSubExpr());
+    // Propagate the volatile qualifer to LValue, if exist in E.
+    if (E->getType().isVolatileQualified())
+      LV.getQuals().addVolatile();
     if (LV.isSimple()) {
       Address V = LV.getAddress(*this);
       if (V.isValid()) {
Index: clang/lib/CodeGen/CGExprComplex.cpp
===================================================================
--- clang/lib/CodeGen/CGExprComplex.cpp
+++ clang/lib/CodeGen/CGExprComplex.cpp
@@ -182,6 +182,8 @@
   ComplexPairTy VisitCastExpr(CastExpr *E) {
     if (const auto *ECE = dyn_cast<ExplicitCastExpr>(E))
       CGF.CGM.EmitExplicitCastExprType(ECE, &CGF);
+    if (E->getCastKind() == CK_NoOp && E->isDeclRefExprNodeNotVolatile())
+       return EmitLoadOfLValue(E);
     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
   }
   ComplexPairTy VisitCallExpr(const CallExpr *E);
Index: clang/lib/CodeGen/CGExprScalar.cpp
===================================================================
--- clang/lib/CodeGen/CGExprScalar.cpp
+++ clang/lib/CodeGen/CGExprScalar.cpp
@@ -2225,7 +2225,9 @@
     return Visit(const_cast<Expr*>(E));
 
   case CK_NoOp: {
-    llvm::Value *V = Visit(const_cast<Expr *>(E));
+    llvm::Value *V = CE->isDeclRefExprNodeNotVolatile()
+                     ? EmitLoadOfLValue(CE)
+		     : Visit(const_cast<Expr *>(E)) ;
     if (V) {
       // CK_NoOp can model a pointer qualification conversion, which can remove
       // an array bound and change the IR type.
Index: clang/test/CodeGen/volatile.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGen/volatile.cpp
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -O2 -triple=x86_64-unknown-linux-gnu -emit-llvm %s -o -  | FileCheck %s -check-prefix CHECK
+struct agg 
+{
+int a ;
+int b ;
+} t;
+struct agg a;
+int vt;
+_Complex float cf;
+
+void f0() {
+    const_cast<volatile _Complex float &>(cf) = const_cast<volatile _Complex float&>(cf) + 1;
+//  CHECK: %cf.real = load volatile float, ptr @cf
+//  CHECK: %cf.imag = load volatile float, ptr getelementptr
+//  CHECK: %add.r = fadd float %cf.real, 1.000000e+00
+//  CHECK: %add.i = fadd float %cf.imag, 0.000000e+00
+//  CHECK: store volatile float %add.r
+//  CHECK: store volatile float %add.i, ptr getelementptr
+      static_cast<volatile _Complex float &>(cf) = static_cast<volatile _Complex float&>(cf) + 1;
+//  CHECK: %cf.real1 = load volatile float, ptr @cf
+//  CHECK: %cf.imag2 = load volatile float, ptr getelementptr
+//  CHECK: %add.r3 = fadd float %cf.real1, 1.000000e+00
+//  CHECK: %add.i4 = fadd float %cf.imag2, 0.000000e+00
+//  CHECK: store volatile float %add.r3, ptr @cf
+//  CHECK: store volatile float %add.i4, ptr getelementptr
+    const_cast<volatile  int  &>(a.a) = const_cast<volatile int &>(t.a) ;
+//  CHECK: %0 = load volatile i32, ptr @t
+//  CHECK: store volatile i32 %0, ptr @a
+    static_cast<volatile  int  &>(a.b) = static_cast<volatile int  &>(t.a) ;
+//  CHECK: %1 = load volatile i32, ptr @t
+//  CHECK: store volatile i32 %1, ptr getelementptr
+    const_cast<volatile int&>(vt) = const_cast<volatile int&>(vt) + 1;
+//  CHECK: %2 = load volatile i32, ptr @vt
+//  CHECK: %add = add nsw i32 %2, 1
+//  CHECK: store volatile i32 %add, ptr @vt
+     static_cast<volatile int&>(vt) = static_cast<volatile int&>(vt) + 1;
+//  CHECK: %3 = load volatile i32, ptr @vt
+//  CHECK: %add5 = add nsw i32 %3, 1
+//  CHECK: store volatile i32 %add5, ptr @vt
+}