Index: include/clang/AST/Expr.h
===================================================================
--- include/clang/AST/Expr.h	(revision 172829)
+++ include/clang/AST/Expr.h	(working copy)
@@ -537,7 +537,8 @@
   /// this function returns true, it returns the folded constant in Result. If
   /// the expression is a glvalue, an lvalue-to-rvalue conversion will be
   /// applied.
-  bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const;
+  bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx,
+                        bool OverflowCheckMode=false) const;
 
   /// EvaluateAsBooleanCondition - Return true if this is a constant
   /// which we we can fold and convert to a boolean condition using
@@ -570,6 +571,9 @@
   /// integer.
   llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx,
                           SmallVectorImpl<PartialDiagnosticAt> *Diag=0) const;
+  
+  void EvaluateKnownConstIntForOverflow(const ASTContext &Ctx,
+                            SmallVectorImpl<PartialDiagnosticAt> *Diag) const;
 
   /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an
   /// lvalue with link time known address, with no side-effects.
Index: include/clang/Basic/DiagnosticASTKinds.td
===================================================================
--- include/clang/Basic/DiagnosticASTKinds.td	(revision 172829)
+++ include/clang/Basic/DiagnosticASTKinds.td	(working copy)
@@ -106,6 +106,9 @@
   "(skipping %0 call%s0 in backtrace; use -fconstexpr-backtrace-limit=0 to "
   "see all)">;
 def note_constexpr_call_here : Note<"in call to '%0'">;
+def warn_integer_constant_overflow : Warning<
+  "integer constant overflow in expression">,
+  InGroup<DiagGroup<"integer-overflow">>;
 
 // inline asm related.
 let CategoryName = "Inline Assembly Issue" in {
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td	(revision 172829)
+++ include/clang/Basic/DiagnosticSemaKinds.td	(working copy)
@@ -5735,9 +5735,6 @@
 def warn_case_value_overflow : Warning<
   "overflow converting case value to switch condition type (%0 to %1)">,
   InGroup<Switch>;
-def warn_case_constant_overflow : Warning<
-  "overflow in case constant expression results in value %0">,
-  InGroup<Switch>;
 def err_duplicate_case : Error<"duplicate case value '%0'">;
 def err_duplicate_case_differing_expr : Error<
   "duplicate case value: '%0' and '%1' both equal '%2'">;
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h	(revision 172829)
+++ include/clang/Sema/Sema.h	(working copy)
@@ -3984,7 +3984,8 @@
                                           : SourceLocation());
   }
   ExprResult ActOnFinishFullExpr(Expr *Expr, SourceLocation CC,
-                                 bool DiscardedValue = false);
+                                 bool DiscardedValue = false,
+                                 bool IsConstexpr = false);
   StmtResult ActOnFinishFullStmt(Stmt *Stmt);
 
   // Marks SS invalid if it represents an incomplete type.
@@ -7322,11 +7323,13 @@
                             SourceLocation ReturnLoc);
   void CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr* RHS);
   void CheckImplicitConversions(Expr *E, SourceLocation CC = SourceLocation());
+  void CheckForIntOverflow(Expr *E);
   void CheckUnsequencedOperations(Expr *E);
 
   /// \brief Perform semantic checks on a completed expression. This will either
   /// be a full-expression or a default argument expression.
-  void CheckCompletedExpr(Expr *E, SourceLocation CheckLoc = SourceLocation());
+  void CheckCompletedExpr(Expr *E, SourceLocation CheckLoc = SourceLocation(),
+                          bool IsConstexpr = false);
 
   void CheckBitFieldInitialization(SourceLocation InitLoc, FieldDecl *Field,
                                    Expr *Init);
Index: lib/AST/ExprConstant.cpp
===================================================================
--- lib/AST/ExprConstant.cpp	(revision 172829)
+++ lib/AST/ExprConstant.cpp	(working copy)
@@ -384,13 +384,17 @@
     /// expression is a potential constant expression? If so, some diagnostics
     /// are suppressed.
     bool CheckingPotentialConstantExpression;
+    
+    bool IntOverflowCheckMode;
 
-    EvalInfo(const ASTContext &C, Expr::EvalStatus &S)
+    EvalInfo(const ASTContext &C, Expr::EvalStatus &S,
+             bool OverflowCheckMode=false)
       : Ctx(const_cast<ASTContext&>(C)), EvalStatus(S), CurrentCall(0),
         CallStackDepth(0), NextCallIndex(1),
         BottomFrame(*this, SourceLocation(), 0, 0, 0),
         EvaluatingDecl(0), EvaluatingDeclValue(0), HasActiveDiagnostic(false),
-        CheckingPotentialConstantExpression(false) {}
+        CheckingPotentialConstantExpression(false),
+        IntOverflowCheckMode(OverflowCheckMode) {}
 
     void setEvaluatingDecl(const VarDecl *VD, APValue &Value) {
       EvaluatingDecl = VD;
@@ -474,6 +478,8 @@
       return OptionalDiagnostic();
     }
 
+    bool getIntOverflowCheckMode() { return IntOverflowCheckMode; }
+    
     /// Diagnose that the evaluation does not produce a C++11 core constant
     /// expression.
     template<typename LocArg>
@@ -4419,8 +4425,13 @@
 
   APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false);
   APSInt Result = Value.trunc(LHS.getBitWidth());
-  if (Result.extend(BitWidth) != Value)
-    HandleOverflow(Info, E, Value, E->getType());
+  if (Result.extend(BitWidth) != Value) {
+    if (Info.getIntOverflowCheckMode())
+      Info.Diag(E->getExprLoc(),
+                diag::warn_integer_constant_overflow);
+    else
+      HandleOverflow(Info, E, Value, E->getType());
+  }
   return Result;
 }
 
@@ -6264,7 +6275,8 @@
 /// we want to.  If this function returns true, it returns the folded constant
 /// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion
 /// will be applied to the result.
-bool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const {
+bool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx,
+                            bool OverflowCheckMode) const {
   // Fast-path evaluations of integer literals, since we sometimes see files
   // containing vast quantities of these.
   if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(this)) {
@@ -6279,7 +6291,7 @@
       !Ctx.getLangOpts().CPlusPlus11)
     return false;
 
-  EvalInfo Info(Ctx, Result);
+  EvalInfo Info(Ctx, Result, OverflowCheckMode);
   return ::EvaluateAsRValue(Info, this, Result.Val);
 }
 
@@ -6375,6 +6387,13 @@
   return EvalResult.Val.getInt();
 }
 
+void Expr::EvaluateKnownConstIntForOverflow(const ASTContext &Ctx,
+                    SmallVectorImpl<PartialDiagnosticAt> *Diags) const {
+  EvalResult EvalResult;
+  EvalResult.Diag = Diags;
+  (void)EvaluateAsRValue(EvalResult, Ctx, true /*OverflowCheckMode*/);
+}
+
  bool Expr::EvalResult::isGlobalLValue() const {
    assert(Val.isLValue());
    return IsGlobalLValue(Val.getLValueBase());
Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp	(revision 172829)
+++ lib/Sema/SemaChecking.cpp	(working copy)
@@ -14,6 +14,7 @@
 
 #include "clang/Sema/SemaInternal.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTDiagnostic.h"
 #include "clang/AST/CharUnits.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclObjC.h"
@@ -5171,6 +5172,22 @@
   AnalyzeImplicitConversions(*this, E, CC);
 }
 
+/// Diagnose when expression is an integer constant expression and its evaluation
+/// results in integer overflow
+void Sema::CheckForIntOverflow (Expr *E) {
+  if (const BinaryOperator *BExpr = dyn_cast<BinaryOperator>(E->IgnoreParens())) {
+    unsigned Opc = BExpr->getOpcode();
+    if (Opc != BO_Add && Opc != BO_Sub && Opc != BO_Mul)
+      return;
+    llvm::SmallVector<PartialDiagnosticAt, 4> Diags;
+    E->EvaluateKnownConstIntForOverflow(Context, &Diags);
+    if (Diags.size() &&
+        Diags[0].second.getDiagID() == diag::warn_integer_constant_overflow)
+      Diag(Diags[0].first, Diags[0].second.getDiagID());
+    
+  }
+}
+
 namespace {
 /// \brief Visitor for expressions which looks for unsequenced operations on the
 /// same object.
@@ -5610,9 +5627,12 @@
   }
 }
 
-void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc) {
+void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
+                              bool IsConstexpr) {
   CheckImplicitConversions(E, CheckLoc);
   CheckUnsequencedOperations(E);
+  if (!IsConstexpr)
+    CheckForIntOverflow(E);
 }
 
 void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp	(revision 172829)
+++ lib/Sema/SemaDecl.cpp	(working copy)
@@ -6985,7 +6985,9 @@
   //   struct T { S a, b; } t = { Temp(), Temp() }
   //
   // we should destroy the first Temp before constructing the second.
-  ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation());
+  ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation(),
+                                          false,
+                                          VDecl->isConstexpr());
   if (Result.isInvalid()) {
     VDecl->setInvalidDecl();
     return;
Index: lib/Sema/SemaExprCXX.cpp
===================================================================
--- lib/Sema/SemaExprCXX.cpp	(revision 172829)
+++ lib/Sema/SemaExprCXX.cpp	(working copy)
@@ -5469,7 +5469,8 @@
 }
 
 ExprResult Sema::ActOnFinishFullExpr(Expr *FE, SourceLocation CC,
-                                     bool DiscardedValue) {
+                                     bool DiscardedValue,
+                                     bool IsConstexpr) {
   ExprResult FullExpr = Owned(FE);
 
   if (!FullExpr.get())
@@ -5497,7 +5498,7 @@
       return ExprError();
   }
 
-  CheckCompletedExpr(FullExpr.get(), CC);
+  CheckCompletedExpr(FullExpr.get(), CC, IsConstexpr);
   return MaybeCreateExprWithCleanups(FullExpr);
 }
 
Index: lib/Sema/SemaStmt.cpp
===================================================================
--- lib/Sema/SemaStmt.cpp	(revision 172829)
+++ lib/Sema/SemaStmt.cpp	(working copy)
@@ -338,6 +338,10 @@
       // Recover from an error by just forgetting about it.
     }
   }
+  
+  LHSVal = ActOnFinishFullExpr(LHSVal).take();
+  if (RHSVal)
+    RHSVal = ActOnFinishFullExpr(RHSVal).take();
 
   CaseStmt *CS = new (Context) CaseStmt(LHSVal, RHSVal, CaseLoc, DotDotDotLoc,
                                         ColonLoc);
@@ -732,14 +736,7 @@
       } else {
         // We already verified that the expression has a i-c-e value (C99
         // 6.8.4.2p3) - get that value now.
-        SmallVector<PartialDiagnosticAt, 8> Diags;
-        LoVal = Lo->EvaluateKnownConstInt(Context, &Diags);
-        if (Diags.size() == 1 && 
-            Diags[0].second.getDiagID() == diag::note_constexpr_overflow) {
-          Diag(Lo->getLocStart(), diag::warn_case_constant_overflow) <<
-            LoVal.toString(10);
-          Diag(Diags[0].first, Diags[0].second);
-        }
+        LoVal = Lo->EvaluateKnownConstInt(Context);
 
         // If the LHS is not the same type as the condition, insert an implicit
         // cast.
Index: test/Sema/switch-1.c
===================================================================
--- test/Sema/switch-1.c	(revision 172829)
+++ test/Sema/switch-1.c	(working copy)
@@ -4,12 +4,12 @@
 
 int f(int i) {
   switch (i) {
-    case 2147483647 + 2: // expected-note {{value 2147483649 is outside the range of representable values of type 'int'}}  \
-                      // expected-warning {{overflow in case constant expression results in value -2147483647}} 
+    case 2147483647 + 2: // expected-warning {{integer constant overflow in expression}}
       return 1;
-    case 9223372036854775807L * 4 : // expected-note {{value 36893488147419103228 is outside the range of representable values of type 'long'}}   \
-                        // expected-warning {{overflow in case constant expression results in value -4}} 
+    case 9223372036854775807L * 4: // expected-warning {{integer constant overflow in expression}}
       return 2;
+    case (123456 *789012) + 1:  // expected-warning {{integer constant overflow in expression}}
+      return 3;
     case 2147483647:
       return 0;
   }