4 files changed, 64 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index b8883456911..3c554c9a524 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -9635,6 +9635,18 @@ QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
     return ResultTy;
   }
 
+  if (getLangOpts().OpenCLVersion >= 200) {
+    if (LHSIsNull && RHSType->isQueueT()) {
+      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
+      return ResultTy;
+    }
+
+    if (LHSType->isQueueT() && RHSIsNull) {
+      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
+      return ResultTy;
+    }
+  }
+
   return InvalidOperands(Loc, LHS, RHS);
 }
 
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 74beeac7244..6967a4babd6 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -3878,6 +3878,12 @@ Sema::PerformImplicitConversion(Expr *From, QualType ToType,
                              From->getValueKind()).get();
     break;
 
+  case ICK_Zero_Queue_Conversion:
+    From = ImpCastExprToType(From, ToType,
+                             CK_ZeroToOCLQueue,
+                             From->getValueKind()).get();
+    break;
+
   case ICK_Lvalue_To_Rvalue:
   case ICK_Array_To_Pointer:
   case ICK_Function_To_Pointer:
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index ce012896f5b..895ccb54844 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -3077,6 +3077,7 @@ void InitializationSequence::Step::Destroy() {
   case SK_StdInitializerListConstructorCall:
   case SK_OCLSamplerInit:
   case SK_OCLZeroEvent:
+  case SK_OCLZeroQueue:
     break;
 
   case SK_ConversionSequence:
@@ -3365,6 +3366,13 @@ void InitializationSequence::AddOCLZeroEventStep(QualType T) {
   Steps.push_back(S);
 }
 
+void InitializationSequence::AddOCLZeroQueueStep(QualType T) {
+  Step S;
+  S.Kind = SK_OCLZeroQueue;
+  S.Type = T;
+  Steps.push_back(S);
+}
+
 void InitializationSequence::RewrapReferenceInitList(QualType T,
                                                      InitListExpr *Syntactic) {
   assert(Syntactic->getNumInits() == 1 &&
@@ -5030,6 +5038,20 @@ static bool TryOCLZeroEventInitialization(Sema &S,
   return true;
 }
 
+static bool TryOCLZeroQueueInitialization(Sema &S,
+                                          InitializationSequence &Sequence,
+                                          QualType DestType,
+                                          Expr *Initializer) {
+  if (!S.getLangOpts().OpenCL || S.getLangOpts().OpenCLVersion < 200 ||
+      !DestType->isQueueT() ||
+      !Initializer->isIntegerConstantExpr(S.getASTContext()) ||
+      (Initializer->EvaluateKnownConstInt(S.getASTContext()) != 0))
+    return false;
+
+  Sequence.AddOCLZeroQueueStep(DestType);
+  return true;
+}
+
 InitializationSequence::InitializationSequence(Sema &S,
                                                const InitializedEntity &Entity,
                                                const InitializationKind &Kind,
@@ -5292,6 +5314,9 @@ void InitializationSequence::InitializeFrom(Sema &S,
     if (TryOCLZeroEventInitialization(S, *this, DestType, Initializer))
       return;
 
+    if (TryOCLZeroQueueInitialization(S, *this, DestType, Initializer))
+       return;
+
     // Handle initialization in C
     AddCAssignmentStep(DestType);
     MaybeProduceObjCObject(S, *this, Entity);
@@ -6529,7 +6554,8 @@ InitializationSequence::Perform(Sema &S,
   case SK_ProduceObjCObject:
   case SK_StdInitializerList:
   case SK_OCLSamplerInit:
-  case SK_OCLZeroEvent: {
+  case SK_OCLZeroEvent:
+  case SK_OCLZeroQueue: {
     assert(Args.size() == 1);
     CurInit = Args[0];
     if (!CurInit.get()) return ExprError();
@@ -7213,6 +7239,15 @@ InitializationSequence::Perform(Sema &S,
                                     CurInit.get()->getValueKind());
       break;
     }
+    case SK_OCLZeroQueue: {
+      assert(Step->Type->isQueueT() &&
+             "Event initialization on non queue type.");
+
+      CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
+                                    CK_ZeroToOCLQueue,
+                                    CurInit.get()->getValueKind());
+      break;
+    }
     }
   }
 
@@ -8041,6 +8076,10 @@ void InitializationSequence::dump(raw_ostream &OS) const {
     case SK_OCLZeroEvent:
       OS << "OpenCL event_t from zero";
       break;
+
+    case SK_OCLZeroQueue:
+      OS << "OpenCL queue_t from zero";
+      break;
     }
 
     OS << " [" << S->Type.getAsString() << ']';
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index d49142b8d85..c8a45013e9e 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -1785,6 +1785,11 @@ static bool IsStandardConversion(Sema &S, Expr* From, QualType ToType,
              From->EvaluateKnownConstInt(S.getASTContext()) == 0) {
     SCS.Second = ICK_Zero_Event_Conversion;
     FromType = ToType;
+  } else if (ToType->isQueueT() &&
+             From->isIntegerConstantExpr(S.getASTContext()) &&
+             (From->EvaluateKnownConstInt(S.getASTContext()) == 0)) {
+    SCS.Second = ICK_Zero_Queue_Conversion;
+    FromType = ToType;
   } else {
     // No second conversion required.
     SCS.Second = ICK_Identity;
@@ -5162,6 +5167,7 @@ static bool CheckConvertedConstantConversions(Sema &S,
   case ICK_Function_Conversion:
   case ICK_Integral_Promotion:
   case ICK_Integral_Conversion: // Narrowing conversions are checked elsewhere.
+  case ICK_Zero_Queue_Conversion:
     return true;
 
   case ICK_Boolean_Conversion: