Index: clang/lib/CodeGen/CGExpr.cpp
===================================================================
--- clang/lib/CodeGen/CGExpr.cpp
+++ clang/lib/CodeGen/CGExpr.cpp
@@ -1608,7 +1608,7 @@
 
 llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
                                                SourceLocation Loc) {
-  return EmitLoadOfScalar(lvalue.getAddress(*this), lvalue.isVolatile(),
+  return EmitLoadOfScalar(lvalue.getAddress(*this),lvalue.isVolatile() |  isVolatileCastStmt,
                           lvalue.getType(), Loc, lvalue.getBaseInfo(),
                           lvalue.getTBAAInfo(), lvalue.isNontemporal());
 }
@@ -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/CGExprScalar.cpp
===================================================================
--- clang/lib/CodeGen/CGExprScalar.cpp
+++ clang/lib/CodeGen/CGExprScalar.cpp
@@ -2225,6 +2225,20 @@
     return Visit(const_cast<Expr*>(E));
 
   case CK_NoOp: {
+    // Propagate the volatileness if Casted to volatile like
+    //
+    // |-ImplicitCastExpr 'int' <LValueToRValue>
+    // | `-CXXStaticCastExpr 'volatile int' lvalue static_cast<volatile int &> <NoOp>
+    // |   `-ImplicitCastExpr  'volatile int' lvalue <NoOp> part_of_explicit_cast
+    // |     `-DeclRefExpr 'int' lvalue Var 0x55556b04caa0 'x' 'int'
+    //
+    // Later required to emit the load inst accrodingly.
+    if (!CGF.isVolatileCastStmt && CE->getType().isVolatileQualified())
+      CGF.isVolatileCastStmt= true;
+    // Reset if set and CastStnt doesn't required in general.
+    else if (CGF.isVolatileCastStmt && !CE->getType().isVolatileQualified())
+      CGF.isVolatileCastStmt= false;
+
     llvm::Value *V = Visit(const_cast<Expr *>(E));
     if (V) {
       // CK_NoOp can model a pointer qualification conversion, which can remove
Index: clang/lib/CodeGen/CodeGenFunction.h
===================================================================
--- clang/lib/CodeGen/CodeGenFunction.h
+++ clang/lib/CodeGen/CodeGenFunction.h
@@ -545,6 +545,10 @@
   /// potentially set the return value.
   bool SawAsmBlock = false;
 
+  /// Propagate the volatileness to the reference decl node in the CastStmt
+  //  Note the decl node doesn't has be the volatile qualifier.
+  bool isVolatileCastStmt = false;
+
   GlobalDecl CurSEHParent;
 
   /// True if the current function is an outlined SEH helper. This can be a
Index: clang/test/CodeGen/volatile.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGen/volatile.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -emit-llvm < %s | FileCheck %s -check-prefix CHECK
+
+int x ;
+void f0() {
+    const_cast<volatile int&>(x) = const_cast<volatile int&>(x) + 1;
+//  CHECK: %0 = load volatile i32, ptr @x
+//  CHECK: %add = add nsw i32 %0, 1
+//  CHECK: store volatile i32 %add, ptr @x
+    static_cast<volatile int&>(x) = static_cast<volatile int&>(x) + 1;
+//  CHECK: %1 = load volatile i32, ptr @x
+//  CHECK: %add1 = add nsw i32 %1, 1
+//  CHECK: store volatile i32 %add1, ptr @x
+}