diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -2625,12 +2625,16 @@
   /** OpenMP target parallel loop directive.
    */
   CXCursor_OMPTargetParallelGenericLoopDirective = 299,
-
+  
   /** OpenMP parallel masked directive.
    */
   CXCursor_OMPParallelMaskedDirective = 300,
+  
+  /** OpenMP masked taskloop directive.
+   */
+  CXCursor_OMPMaskedTaskLoopDirective = 301,
 
-  CXCursor_LastStmt = CXCursor_OMPParallelMaskedDirective,
+  CXCursor_LastStmt = CXCursor_OMPMaskedTaskLoopDirective,
 
   /**
    * Cursor that represents the translation unit itself.
diff --git a/clang/include/clang/AST/RecursiveASTVisitor.h b/clang/include/clang/AST/RecursiveASTVisitor.h
--- a/clang/include/clang/AST/RecursiveASTVisitor.h
+++ b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -3078,6 +3078,9 @@
 DEF_TRAVERSE_STMT(OMPParallelMasterTaskLoopSimdDirective,
                   { TRY_TO(TraverseOMPExecutableDirective(S)); })
 
+DEF_TRAVERSE_STMT(OMPMaskedTaskLoopDirective,
+                  { TRY_TO(TraverseOMPExecutableDirective(S)); })
+
 DEF_TRAVERSE_STMT(OMPDistributeDirective,
                   { TRY_TO(TraverseOMPExecutableDirective(S)); })
 
diff --git a/clang/include/clang/AST/StmtOpenMP.h b/clang/include/clang/AST/StmtOpenMP.h
--- a/clang/include/clang/AST/StmtOpenMP.h
+++ b/clang/include/clang/AST/StmtOpenMP.h
@@ -1523,6 +1523,7 @@
            T->getStmtClass() == OMPParallelForSimdDirectiveClass ||
            T->getStmtClass() == OMPTaskLoopDirectiveClass ||
            T->getStmtClass() == OMPTaskLoopSimdDirectiveClass ||
+           T->getStmtClass() == OMPMaskedTaskLoopDirectiveClass ||
            T->getStmtClass() == OMPMasterTaskLoopDirectiveClass ||
            T->getStmtClass() == OMPMasterTaskLoopSimdDirectiveClass ||
            T->getStmtClass() == OMPGenericLoopDirectiveClass ||
@@ -3858,6 +3859,82 @@
   }
 };
 
+/// This represents '#pragma omp masked taskloop' directive.
+///
+/// \code
+/// #pragma omp masked taskloop private(a,b) grainsize(val) num_tasks(num)
+/// \endcode
+/// In this example directive '#pragma omp masked taskloop' has clauses
+/// 'private' with the variables 'a' and 'b', 'grainsize' with expression 'val'
+/// and 'num_tasks' with expression 'num'.
+///
+class OMPMaskedTaskLoopDirective final : public OMPLoopDirective {
+  friend class ASTStmtReader;
+  friend class OMPExecutableDirective;
+  /// true if the construct has inner cancel directive.
+  bool HasCancel = false;
+
+  /// Build directive with the given start and end location.
+  ///
+  /// \param StartLoc Starting location of the directive kind.
+  /// \param EndLoc Ending location of the directive.
+  /// \param CollapsedNum Number of collapsed nested loops.
+  ///
+  OMPMaskedTaskLoopDirective(SourceLocation StartLoc, SourceLocation EndLoc,
+                             unsigned CollapsedNum)
+      : OMPLoopDirective(OMPMaskedTaskLoopDirectiveClass,
+                         llvm::omp::OMPD_masked_taskloop, StartLoc, EndLoc,
+                         CollapsedNum) {}
+
+  /// Build an empty directive.
+  ///
+  /// \param CollapsedNum Number of collapsed nested loops.
+  ///
+  explicit OMPMaskedTaskLoopDirective(unsigned CollapsedNum)
+      : OMPLoopDirective(OMPMaskedTaskLoopDirectiveClass,
+                         llvm::omp::OMPD_masked_taskloop, SourceLocation(),
+                         SourceLocation(), CollapsedNum) {}
+
+  /// Set cancel state.
+  void setHasCancel(bool Has) { HasCancel = Has; }
+
+public:
+  /// Creates directive with a list of \a Clauses.
+  ///
+  /// \param C AST context.
+  /// \param StartLoc Starting location of the directive kind.
+  /// \param EndLoc Ending Location of the directive.
+  /// \param CollapsedNum Number of collapsed loops.
+  /// \param Clauses List of clauses.
+  /// \param AssociatedStmt Statement, associated with the directive.
+  /// \param Exprs Helper expressions for CodeGen.
+  /// \param HasCancel true if this directive has inner cancel directive.
+  ///
+  static OMPMaskedTaskLoopDirective *
+  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
+         unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses,
+         Stmt *AssociatedStmt, const HelperExprs &Exprs, bool HasCancel);
+
+  /// Creates an empty directive with the place
+  /// for \a NumClauses clauses.
+  ///
+  /// \param C AST context.
+  /// \param CollapsedNum Number of collapsed nested loops.
+  /// \param NumClauses Number of clauses.
+  ///
+  static OMPMaskedTaskLoopDirective *CreateEmpty(const ASTContext &C,
+                                                 unsigned NumClauses,
+                                                 unsigned CollapsedNum,
+                                                 EmptyShell);
+
+  /// Return true if current directive has inner cancel directive.
+  bool hasCancel() const { return HasCancel; }
+
+  static bool classof(const Stmt *T) {
+    return T->getStmtClass() == OMPMaskedTaskLoopDirectiveClass;
+  }
+};
+
 /// This represents '#pragma omp master taskloop simd' directive.
 ///
 /// \code
diff --git a/clang/include/clang/Basic/StmtNodes.td b/clang/include/clang/Basic/StmtNodes.td
--- a/clang/include/clang/Basic/StmtNodes.td
+++ b/clang/include/clang/Basic/StmtNodes.td
@@ -264,6 +264,7 @@
 def OMPMasterTaskLoopSimdDirective : StmtNode<OMPLoopDirective>;
 def OMPParallelMasterTaskLoopDirective : StmtNode<OMPLoopDirective>;
 def OMPParallelMasterTaskLoopSimdDirective : StmtNode<OMPLoopDirective>;
+def OMPMaskedTaskLoopDirective : StmtNode<OMPLoopDirective>;
 def OMPDistributeDirective : StmtNode<OMPLoopDirective>;
 def OMPDistributeParallelForDirective : StmtNode<OMPLoopDirective>;
 def OMPDistributeParallelForSimdDirective : StmtNode<OMPLoopDirective>;
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -11109,6 +11109,11 @@
   StmtResult ActOnOpenMPParallelMasterTaskLoopSimdDirective(
       ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
       SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
+  /// Called on well-formed '\#pragma omp masked taskloop' after parsing of the
+  /// associated statement.
+  StmtResult ActOnOpenMPMaskedTaskLoopDirective(
+      ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
+      SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
   /// Called on well-formed '\#pragma omp distribute' after parsing
   /// of the associated statement.
   StmtResult
diff --git a/clang/include/clang/Serialization/ASTBitCodes.h b/clang/include/clang/Serialization/ASTBitCodes.h
--- a/clang/include/clang/Serialization/ASTBitCodes.h
+++ b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -1949,6 +1949,7 @@
   STMT_OMP_MASTER_TASKLOOP_SIMD_DIRECTIVE,
   STMT_OMP_PARALLEL_MASTER_TASKLOOP_DIRECTIVE,
   STMT_OMP_PARALLEL_MASTER_TASKLOOP_SIMD_DIRECTIVE,
+  STMT_OMP_MASKED_TASKLOOP_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_DIRECTIVE,
   STMT_OMP_TARGET_UPDATE_DIRECTIVE,
   STMT_OMP_DISTRIBUTE_PARALLEL_FOR_DIRECTIVE,
diff --git a/clang/lib/AST/StmtOpenMP.cpp b/clang/lib/AST/StmtOpenMP.cpp
--- a/clang/lib/AST/StmtOpenMP.cpp
+++ b/clang/lib/AST/StmtOpenMP.cpp
@@ -1176,6 +1176,51 @@
       numLoopChildren(CollapsedNum, OMPD_master_taskloop), CollapsedNum);
 }
 
+OMPMaskedTaskLoopDirective *OMPMaskedTaskLoopDirective::Create(
+    const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
+    unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses, Stmt *AssociatedStmt,
+    const HelperExprs &Exprs, bool HasCancel) {
+  auto *Dir = createDirective<OMPMaskedTaskLoopDirective>(
+      C, Clauses, AssociatedStmt,
+      numLoopChildren(CollapsedNum, OMPD_masked_taskloop), StartLoc, EndLoc,
+      CollapsedNum);
+  Dir->setIterationVariable(Exprs.IterationVarRef);
+  Dir->setLastIteration(Exprs.LastIteration);
+  Dir->setCalcLastIteration(Exprs.CalcLastIteration);
+  Dir->setPreCond(Exprs.PreCond);
+  Dir->setCond(Exprs.Cond);
+  Dir->setInit(Exprs.Init);
+  Dir->setInc(Exprs.Inc);
+  Dir->setIsLastIterVariable(Exprs.IL);
+  Dir->setLowerBoundVariable(Exprs.LB);
+  Dir->setUpperBoundVariable(Exprs.UB);
+  Dir->setStrideVariable(Exprs.ST);
+  Dir->setEnsureUpperBound(Exprs.EUB);
+  Dir->setNextLowerBound(Exprs.NLB);
+  Dir->setNextUpperBound(Exprs.NUB);
+  Dir->setNumIterations(Exprs.NumIterations);
+  Dir->setCounters(Exprs.Counters);
+  Dir->setPrivateCounters(Exprs.PrivateCounters);
+  Dir->setInits(Exprs.Inits);
+  Dir->setUpdates(Exprs.Updates);
+  Dir->setFinals(Exprs.Finals);
+  Dir->setDependentCounters(Exprs.DependentCounters);
+  Dir->setDependentInits(Exprs.DependentInits);
+  Dir->setFinalsConditions(Exprs.FinalsConditions);
+  Dir->setPreInits(Exprs.PreInits);
+  Dir->setHasCancel(HasCancel);
+  return Dir;
+}
+
+OMPMaskedTaskLoopDirective *
+OMPMaskedTaskLoopDirective::CreateEmpty(const ASTContext &C,
+                                        unsigned NumClauses,
+                                        unsigned CollapsedNum, EmptyShell) {
+  return createEmptyDirective<OMPMaskedTaskLoopDirective>(
+      C, NumClauses, /*HasAssociatedStmt=*/true,
+      numLoopChildren(CollapsedNum, OMPD_masked_taskloop), CollapsedNum);
+}
+
 OMPMasterTaskLoopSimdDirective *OMPMasterTaskLoopSimdDirective::Create(
     const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
     unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses, Stmt *AssociatedStmt,
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -880,6 +880,12 @@
   PrintOMPExecutableDirective(Node);
 }
 
+void StmtPrinter::VisitOMPMaskedTaskLoopDirective(
+    OMPMaskedTaskLoopDirective *Node) {
+  Indent() << "#pragma omp masked taskloop";
+  PrintOMPExecutableDirective(Node);
+}
+
 void StmtPrinter::VisitOMPMasterTaskLoopSimdDirective(
     OMPMasterTaskLoopSimdDirective *Node) {
   Indent() << "#pragma omp master taskloop simd";
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -1095,6 +1095,11 @@
   VisitOMPLoopDirective(S);
 }
 
+void StmtProfiler::VisitOMPMaskedTaskLoopDirective(
+    const OMPMaskedTaskLoopDirective *S) {
+  VisitOMPLoopDirective(S);
+}
+
 void StmtProfiler::VisitOMPMasterTaskLoopSimdDirective(
     const OMPMasterTaskLoopSimdDirective *S) {
   VisitOMPLoopDirective(S);
diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -484,6 +484,7 @@
          DKind == OMPD_master_taskloop || DKind == OMPD_master_taskloop_simd ||
          DKind == OMPD_parallel_master_taskloop ||
          DKind == OMPD_parallel_master_taskloop_simd ||
+         DKind == OMPD_masked_taskloop ||
          DKind == OMPD_distribute || DKind == OMPD_target_parallel_for ||
          DKind == OMPD_distribute_parallel_for ||
          DKind == OMPD_distribute_parallel_for_simd ||
@@ -521,6 +522,7 @@
   return DKind == OMPD_taskloop || DKind == OMPD_taskloop_simd ||
          DKind == OMPD_master_taskloop || DKind == OMPD_master_taskloop_simd ||
          DKind == OMPD_parallel_master_taskloop ||
+         DKind == OMPD_masked_taskloop ||
          DKind == OMPD_parallel_master_taskloop_simd;
 }
 
@@ -700,6 +702,7 @@
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
   case OMPD_master_taskloop_simd:
+  case OMPD_masked_taskloop:
     CaptureRegions.push_back(OMPD_taskloop);
     break;
   case OMPD_parallel_master_taskloop:
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -314,6 +314,9 @@
   case Stmt::OMPMasterTaskLoopDirectiveClass:
     EmitOMPMasterTaskLoopDirective(cast<OMPMasterTaskLoopDirective>(*S));
     break;
+  case Stmt::OMPMaskedTaskLoopDirectiveClass:
+    llvm_unreachable("masked taskloop directive not supported yet.");
+    break;
   case Stmt::OMPMasterTaskLoopSimdDirectiveClass:
     EmitOMPMasterTaskLoopSimdDirective(
         cast<OMPMasterTaskLoopSimdDirective>(*S));
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -178,6 +178,7 @@
       {OMPD_target_teams_distribute_parallel_for, OMPD_simd,
        OMPD_target_teams_distribute_parallel_for_simd},
       {OMPD_master, OMPD_taskloop, OMPD_master_taskloop},
+      {OMPD_masked, OMPD_taskloop, OMPD_masked_taskloop},
       {OMPD_master_taskloop, OMPD_simd, OMPD_master_taskloop_simd},
       {OMPD_parallel, OMPD_master, OMPD_parallel_master},
       {OMPD_parallel, OMPD_masked, OMPD_parallel_masked},
@@ -2385,6 +2386,7 @@
   case OMPD_master_taskloop_simd:
   case OMPD_parallel_master_taskloop:
   case OMPD_parallel_master_taskloop_simd:
+  case OMPD_masked_taskloop:
   case OMPD_distribute:
   case OMPD_target_update:
   case OMPD_distribute_parallel_for:
@@ -2782,6 +2784,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_masked_taskloop:
   case OMPD_master_taskloop_simd:
   case OMPD_parallel_master_taskloop:
   case OMPD_parallel_master_taskloop_simd:
diff --git a/clang/lib/Sema/SemaExceptionSpec.cpp b/clang/lib/Sema/SemaExceptionSpec.cpp
--- a/clang/lib/Sema/SemaExceptionSpec.cpp
+++ b/clang/lib/Sema/SemaExceptionSpec.cpp
@@ -1453,6 +1453,7 @@
   case Stmt::OMPForSimdDirectiveClass:
   case Stmt::OMPMasterDirectiveClass:
   case Stmt::OMPMasterTaskLoopDirectiveClass:
+  case Stmt::OMPMaskedTaskLoopDirectiveClass:
   case Stmt::OMPMasterTaskLoopSimdDirectiveClass:
   case Stmt::OMPOrderedDirectiveClass:
   case Stmt::OMPCanonicalLoopClass:
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -4133,6 +4133,7 @@
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:
+  case OMPD_masked_taskloop:
   case OMPD_master_taskloop_simd: {
     QualType KmpInt32Ty =
         Context.getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/1)
@@ -4865,6 +4866,7 @@
               (SemaRef.getLangOpts().OpenMP >= 50 &&
                (ParentRegion == OMPD_taskloop ||
                 ParentRegion == OMPD_master_taskloop ||
+                ParentRegion == OMPD_masked_taskloop ||
                 ParentRegion == OMPD_parallel_master_taskloop)))) ||
             (CancelRegion == OMPD_sections &&
              (ParentRegion == OMPD_section || ParentRegion == OMPD_sections ||
@@ -6246,6 +6248,11 @@
         ClausesWithImplicit, AStmt, StartLoc, EndLoc, VarsWithInheritedDSA);
     AllowedNameModifiers.push_back(OMPD_taskloop);
     break;
+  case OMPD_masked_taskloop:
+    Res = ActOnOpenMPMaskedTaskLoopDirective(
+        ClausesWithImplicit, AStmt, StartLoc, EndLoc, VarsWithInheritedDSA);
+    AllowedNameModifiers.push_back(OMPD_taskloop);
+    break;
   case OMPD_master_taskloop_simd:
     Res = ActOnOpenMPMasterTaskLoopSimdDirective(
         ClausesWithImplicit, AStmt, StartLoc, EndLoc, VarsWithInheritedDSA);
@@ -8867,6 +8874,7 @@
                                          DVar.CKind != OMPC_private))) ||
              ((isOpenMPWorksharingDirective(DKind) || DKind == OMPD_taskloop ||
                DKind == OMPD_master_taskloop ||
+               DKind == OMPD_masked_taskloop ||
                DKind == OMPD_parallel_master_taskloop ||
                isOpenMPDistributeDirective(DKind)) &&
               !isOpenMPSimdDirective(DKind) && DVar.CKind != OMPC_unknown &&
@@ -13146,6 +13154,44 @@
                                             DSAStack->isCancelRegion());
 }
 
+StmtResult Sema::ActOnOpenMPMaskedTaskLoopDirective(
+    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
+    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA) {
+  if (!AStmt)
+    return StmtError();
+
+  assert(isa<CapturedStmt>(AStmt) && "Captured statement expected");
+  OMPLoopBasedDirective::HelperExprs B;
+  // In presence of clause 'collapse' or 'ordered' with number of loops, it will
+  // define the nested loops number.
+  unsigned NestedLoopCount =
+      checkOpenMPLoop(OMPD_masked_taskloop, getCollapseNumberExpr(Clauses),
+                      /*OrderedLoopCountExpr=*/nullptr, AStmt, *this, *DSAStack,
+                      VarsWithImplicitDSA, B);
+  if (NestedLoopCount == 0)
+    return StmtError();
+
+  assert((CurContext->isDependentContext() || B.builtAll()) &&
+         "omp for loop exprs were not built");
+
+  // OpenMP, [2.9.2 taskloop Construct, Restrictions]
+  // The grainsize clause and num_tasks clause are mutually exclusive and may
+  // not appear on the same taskloop directive.
+  if (checkMutuallyExclusiveClauses(*this, Clauses,
+                                    {OMPC_grainsize, OMPC_num_tasks}))
+    return StmtError();
+  // OpenMP, [2.9.2 taskloop Construct, Restrictions]
+  // If a reduction clause is present on the taskloop directive, the nogroup
+  // clause must not be specified.
+  if (checkReductionClauseWithNogroup(*this, Clauses))
+    return StmtError();
+
+  setFunctionHasBranchProtectedScope();
+  return OMPMaskedTaskLoopDirective::Create(Context, StartLoc, EndLoc,
+                                            NestedLoopCount, Clauses, AStmt, B,
+                                            DSAStack->isCancelRegion());
+}
+
 StmtResult Sema::ActOnOpenMPMasterTaskLoopSimdDirective(
     ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
     SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA) {
@@ -14865,6 +14911,7 @@
     case OMPD_task:
     case OMPD_taskloop:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_target_data:
     case OMPD_simd:
     case OMPD_for_simd:
@@ -14954,6 +15001,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_threadprivate:
     case OMPD_allocate:
@@ -15026,6 +15074,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_parallel_master_taskloop:
     case OMPD_parallel_master_taskloop_simd:
@@ -15113,6 +15162,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_parallel_master_taskloop:
     case OMPD_parallel_master_taskloop_simd:
@@ -15198,6 +15248,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_parallel_master_taskloop:
     case OMPD_parallel_master_taskloop_simd:
@@ -15289,6 +15340,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_parallel_master_taskloop:
     case OMPD_parallel_master_taskloop_simd:
@@ -15385,6 +15437,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
     case OMPD_parallel_master_taskloop:
     case OMPD_parallel_master_taskloop_simd:
@@ -15448,6 +15501,7 @@
     case OMPD_taskloop:
     case OMPD_taskloop_simd:
     case OMPD_master_taskloop:
+    case OMPD_masked_taskloop:
     case OMPD_master_taskloop_simd:
       break;
     case OMPD_parallel_master_taskloop:
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -9047,6 +9047,17 @@
   return Res;
 }
 
+template <typename Derived>
+StmtResult TreeTransform<Derived>::TransformOMPMaskedTaskLoopDirective(
+    OMPMaskedTaskLoopDirective *D) {
+  DeclarationNameInfo DirName;
+  getDerived().getSema().StartOpenMPDSABlock(OMPD_masked_taskloop, DirName,
+                                             nullptr, D->getBeginLoc());
+  StmtResult Res = getDerived().TransformOMPExecutableDirective(D);
+  getDerived().getSema().EndOpenMPDSABlock(Res.get());
+  return Res;
+}
+
 template <typename Derived>
 StmtResult TreeTransform<Derived>::TransformOMPMasterTaskLoopSimdDirective(
     OMPMasterTaskLoopSimdDirective *D) {
diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -2508,6 +2508,12 @@
   D->setHasCancel(Record.readBool());
 }
 
+void ASTStmtReader::VisitOMPMaskedTaskLoopDirective(
+    OMPMaskedTaskLoopDirective *D) {
+  VisitOMPLoopDirective(D);
+  D->setHasCancel(Record.readBool());
+}
+
 void ASTStmtReader::VisitOMPMasterTaskLoopSimdDirective(
     OMPMasterTaskLoopSimdDirective *D) {
   VisitOMPLoopDirective(D);
@@ -3439,6 +3445,14 @@
                                                   CollapsedNum, Empty);
       break;
     }
+    
+    case STMT_OMP_MASKED_TASKLOOP_DIRECTIVE: {
+      unsigned CollapsedNum = Record[ASTStmtReader::NumStmtFields];
+      unsigned NumClauses = Record[ASTStmtReader::NumStmtFields + 1];
+      S = OMPMaskedTaskLoopDirective::CreateEmpty(Context, NumClauses,
+                                                  CollapsedNum, Empty);
+      break;
+    }
 
     case STMT_OMP_MASTER_TASKLOOP_SIMD_DIRECTIVE: {
       unsigned CollapsedNum = Record[ASTStmtReader::NumStmtFields];
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -2458,6 +2458,13 @@
   Code = serialization::STMT_OMP_MASTER_TASKLOOP_DIRECTIVE;
 }
 
+void ASTStmtWriter::VisitOMPMaskedTaskLoopDirective(
+    OMPMaskedTaskLoopDirective *D) {
+  VisitOMPLoopDirective(D);
+  Record.writeBool(D->hasCancel());
+  Code = serialization::STMT_OMP_MASKED_TASKLOOP_DIRECTIVE;
+}
+
 void ASTStmtWriter::VisitOMPMasterTaskLoopSimdDirective(
     OMPMasterTaskLoopSimdDirective *D) {
   VisitOMPLoopDirective(D);
diff --git a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
--- a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -1262,6 +1262,7 @@
     case Stmt::OMPTaskLoopDirectiveClass:
     case Stmt::OMPTaskLoopSimdDirectiveClass:
     case Stmt::OMPMasterTaskLoopDirectiveClass:
+    case Stmt::OMPMaskedTaskLoopDirectiveClass:
     case Stmt::OMPMasterTaskLoopSimdDirectiveClass:
     case Stmt::OMPParallelMasterTaskLoopDirectiveClass:
     case Stmt::OMPParallelMasterTaskLoopSimdDirectiveClass:
diff --git a/clang/test/Analysis/cfg-openmp.cpp b/clang/test/Analysis/cfg-openmp.cpp
--- a/clang/test/Analysis/cfg-openmp.cpp
+++ b/clang/test/Analysis/cfg-openmp.cpp
@@ -688,6 +688,30 @@
     argc = x;
 }
 
+// CHECK-LABEL:  void maskedtaskloop(int argc)
+void maskedtaskloop(int argc) {
+  int x, cond, fp, rd, lin, step, map;
+// CHECK-DAG:   [B3]
+// CHECK-DAG:  [[#MTLB:]]: x
+// CHECK-DAG:  [[#MTLB+1]]: [B3.[[#MTLB]]] (ImplicitCastExpr, LValueToRValue, int)
+// CHECK-DAG:  [[#MTLB+2]]: argc
+// CHECK-DAG:  [[#MTLB+3]]: [B3.[[#MTLB+2]]] = [B3.[[#MTLB+1]]]
+// CHECK-DAG:   [B1]
+// CHECK-DAG:  [[#MTL:]]: cond
+// CHECK-DAG:  [[#MTL+1]]: [B1.[[#MTL]]] (ImplicitCastExpr, LValueToRValue, int)
+// CHECK-DAG:  [[#MTL+2]]: [B1.[[#MTL+1]]] (ImplicitCastExpr, IntegralToBoolean, _Bool)
+// CHECK-DAG:  [[#MTL+3]]: fp
+// CHECK-DAG:  [[#MTL+4]]: rd
+// CHECK-DAG:  [[#MTL+5]]: [B3.[[#MTLB+2]]]
+// CHECK-DAG:  [[#MTL+6]]: [B3.[[#MTLB]]]
+// CHECK-DAG:  [[#MTL+7]]: #pragma omp masked taskloop if(cond) firstprivate(fp) reduction(+: rd)
+// CHECK-DAG:    for (int i = 0;
+// CHECK-DAG:        [B3.[[#MTLB+3]]];
+#pragma omp masked taskloop if(cond) firstprivate(fp) reduction(+:rd)
+  for (int i = 0; i < 10; ++i)
+    argc = x;
+}
+
 // CHECK-LABEL:  void tls(int argc)
 void tls(int argc) {
   int x, cond, fp, rd, lin, step, map;
diff --git a/clang/test/OpenMP/masked_taskloop_ast_print.cpp b/clang/test/OpenMP/masked_taskloop_ast_print.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_ast_print.cpp
@@ -0,0 +1,95 @@
+// RUN: %clang_cc1 -verify -fopenmp -ast-print %s | FileCheck %s
+// RUN: %clang_cc1 -fopenmp -x c++ -std=c++11 -emit-pch -o %t %s
+// RUN: %clang_cc1 -fopenmp -std=c++11 -include-pch %t -fsyntax-only -verify %s -ast-print | FileCheck %s
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ast-print %s | FileCheck %s
+// RUN: %clang_cc1 -fopenmp-simd -x c++ -std=c++11 -emit-pch -o %t %s
+// RUN: %clang_cc1 -fopenmp-simd -std=c++11 -include-pch %t -fsyntax-only -verify %s -ast-print | FileCheck %s
+// expected-no-diagnostics
+
+#ifndef HEADER
+#define HEADER
+
+void foo() {}
+
+template <class T, int N>
+T tmain(T argc) {
+  T b = argc, c, d, e, f, g;
+  int tid = 0;
+  static T a;
+// CHECK: static T a;
+#pragma omp taskgroup allocate(d) task_reduction(+: d)
+#pragma omp masked taskloop if(taskloop: argc > N) default(shared) untied priority(N) grainsize(N) reduction(+:g) in_reduction(+: d) filter(tid) allocate(d)
+  // CHECK-NEXT: #pragma omp taskgroup allocate(d) task_reduction(+: d)
+  // CHECK-NEXT: #pragma omp masked taskloop if(taskloop: argc > N) default(shared) untied priority(N) grainsize(N) reduction(+: g) in_reduction(+: d) filter(tid) allocate(d){{$}}
+  for (int i = 0; i < 2; ++i)
+    a = 2;
+// CHECK-NEXT: for (int i = 0; i < 2; ++i)
+// CHECK-NEXT: a = 2;
+#pragma omp parallel
+#pragma omp masked taskloop private(argc, b), firstprivate(c, d), lastprivate(d, f) collapse(N) shared(g) if (c) final(d) mergeable priority(f) nogroup num_tasks(N)
+  for (int i = 0; i < 2; ++i)
+    for (int j = 0; j < 2; ++j)
+      for (int j = 0; j < 2; ++j)
+        for (int j = 0; j < 2; ++j)
+          for (int j = 0; j < 2; ++j)
+  for (int i = 0; i < 2; ++i)
+    for (int j = 0; j < 2; ++j)
+      for (int j = 0; j < 2; ++j)
+        for (int j = 0; j < 2; ++j)
+          for (int j = 0; j < 2; ++j) {
+#pragma omp cancel taskgroup
+#pragma omp cancellation point taskgroup
+            foo();
+          }
+  // CHECK-NEXT: #pragma omp parallel
+  // CHECK-NEXT: #pragma omp masked taskloop private(argc,b) firstprivate(c,d) lastprivate(d,f) collapse(N) shared(g) if(c) final(d) mergeable priority(f) nogroup num_tasks(N)
+  // CHECK-NEXT: for (int i = 0; i < 2; ++i)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int i = 0; i < 2; ++i)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j)
+  // CHECK-NEXT: for (int j = 0; j < 2; ++j) {
+  // CHECK-NEXT: #pragma omp cancel taskgroup
+  // CHECK-NEXT: #pragma omp cancellation point taskgroup
+  // CHECK-NEXT: foo();
+  return T();
+}
+
+// CHECK-LABEL: int main(int argc, char **argv) {
+int main(int argc, char **argv) {
+  int b = argc, c, d, e, f, g;
+  int tid = 0;
+  static int a;
+// CHECK: static int a;
+#pragma omp taskgroup task_reduction(+: d)
+#pragma omp masked taskloop if(taskloop: a) default(none) shared(a) final(b) priority(5) num_tasks(argc) reduction(*: g) in_reduction(+:d)
+  // CHECK-NEXT: #pragma omp taskgroup task_reduction(+: d)
+  // CHECK-NEXT: #pragma omp masked taskloop if(taskloop: a) default(none) shared(a) final(b) priority(5) num_tasks(argc) reduction(*: g) in_reduction(+: d)
+  for (int i = 0; i < 2; ++i)
+    a = 2;
+// CHECK-NEXT: for (int i = 0; i < 2; ++i)
+// CHECK-NEXT: a = 2;
+#pragma omp parallel
+#pragma omp masked taskloop private(argc, b), firstprivate(argv, c), lastprivate(d, f) collapse(2) shared(g) if(argc) mergeable priority(argc) grainsize(argc) reduction(max: a, e) filter(tid)
+  for (int i = 0; i < 10; ++i)
+    for (int j = 0; j < 10; ++j) {
+#pragma omp cancel taskgroup
+#pragma omp cancellation point taskgroup
+      foo();
+    }
+  // CHECK-NEXT: #pragma omp parallel
+  // CHECK-NEXT: #pragma omp masked taskloop private(argc,b) firstprivate(argv,c) lastprivate(d,f) collapse(2) shared(g) if(argc) mergeable priority(argc) grainsize(argc) reduction(max: a,e) filter(tid)
+  // CHECK-NEXT: for (int i = 0; i < 10; ++i)
+  // CHECK-NEXT: for (int j = 0; j < 10; ++j) {
+  // CHECK-NEXT: #pragma omp cancel taskgroup
+  // CHECK-NEXT: #pragma omp cancellation point taskgroup
+  // CHECK-NEXT: foo();
+  return (tmain<int, 5>(argc) + tmain<char, 1>(argv[0][0]));
+}
+
+#endif
diff --git a/clang/test/OpenMP/masked_taskloop_collapse_messages.cpp b/clang/test/OpenMP/masked_taskloop_collapse_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_collapse_messages.cpp
@@ -0,0 +1,99 @@
+// RUN: %clang_cc1 -verify -fopenmp %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp -std=c++98 %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp -std=c++11 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -std=c++98 %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -std=c++11 %s -Wuninitialized
+
+// expected-note@* 0+{{declared here}}
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1;
+
+template <class T, typename S, int N, int ST>
+T tmain(T argc, S **argv) {
+  #pragma omp masked taskloop collapse // expected-error {{expected '(' after 'collapse'}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse () // expected-error {{expected expression}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  // expected-error@+2 {{expected ')'}} expected-note@+2 {{to match this '('}}
+  // expected-error@+1 2 {{integral constant expression}} expected-note@+1 0+{{constant expression}}
+  #pragma omp masked taskloop collapse (argc
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  // expected-error@+1 2 {{argument to 'collapse' clause must be a strictly positive integer value}}
+  #pragma omp masked taskloop collapse (ST // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse (1)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse ((ST > 0) ? 1 + ST : 2) // expected-note 2 {{as specified in 'collapse' clause}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST]; // expected-error 2 {{expected 2 for loops after '#pragma omp masked taskloop', but found only 1}}
+  // expected-error@+3 2 {{directive '#pragma omp masked taskloop' cannot contain more than one 'collapse' clause}}
+  // expected-error@+2 {{argument to 'collapse' clause must be a strictly positive integer value}}
+  // expected-error@+1 2 {{integral constant expression}} expected-note@+1 0+{{constant expression}}
+  #pragma omp masked taskloop collapse (foobool(argc)), collapse (true), collapse (-5)
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse (S) // expected-error {{'S' does not refer to a value}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+#if __cplusplus <= 199711L
+  // expected-error@+4 2 {{integral constant expression}} expected-note@+4 0+{{constant expression}}
+#else
+  // expected-error@+2 2 {{integral constant expression must have integral or unscoped enumeration type, not 'char *'}}
+#endif
+  #pragma omp masked taskloop collapse (argv[1]=2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse (1)
+  for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse (N) // expected-error {{argument to 'collapse' clause must be a strictly positive integer value}}
+  for (T i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
+  #pragma omp masked taskloop collapse (2) // expected-note {{as specified in 'collapse' clause}}
+  foo(); // expected-error {{expected 2 for loops after '#pragma omp masked taskloop'}}
+  return argc;
+}
+
+int main(int argc, char **argv) {
+  #pragma omp masked taskloop collapse // expected-error {{expected '(' after 'collapse'}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  #pragma omp masked taskloop collapse ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  #pragma omp masked taskloop collapse () // expected-error {{expected expression}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  #pragma omp masked taskloop collapse (4 // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-note {{as specified in 'collapse' clause}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4]; // expected-error {{expected 4 for loops after '#pragma omp masked taskloop', but found only 1}}
+  #pragma omp masked taskloop collapse (2+2)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}  expected-note {{as specified in 'collapse' clause}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4]; // expected-error {{expected 4 for loops after '#pragma omp masked taskloop', but found only 1}}
+  // expected-error@+1 {{integral constant expression}} expected-note@+1 0+{{constant expression}}
+  #pragma omp masked taskloop collapse (foobool(1) > 0 ? 1 : 2)
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  // expected-error@+3 {{integral constant expression}} expected-note@+3 0+{{constant expression}}
+  // expected-error@+2 2 {{directive '#pragma omp masked taskloop' cannot contain more than one 'collapse' clause}}
+  // expected-error@+1 {{argument to 'collapse' clause must be a strictly positive integer value}}
+  #pragma omp masked taskloop collapse (foobool(argc)), collapse (true), collapse (-5) 
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  #pragma omp masked taskloop collapse (S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+#if __cplusplus <= 199711L
+  // expected-error@+4 {{integral constant expression}} expected-note@+4 0+{{constant expression}}
+#else
+  // expected-error@+2 {{integral constant expression must have integral or unscoped enumeration type, not 'char *'}}
+#endif
+  #pragma omp masked taskloop collapse (argv[1]=2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 4; i < 12; i++) argv[0][i] = argv[0][i] - argv[0][i-4];
+  // expected-error@+3 {{statement after '#pragma omp masked taskloop' must be a for loop}}
+  // expected-note@+1 {{in instantiation of function template specialization 'tmain<int, char, -1, -2>' requested here}}
+  #pragma omp masked taskloop collapse(collapse(tmain<int, char, -1, -2>(argc, argv) // expected-error 2 {{expected ')'}} expected-note 2 {{to match this '('}}
+  foo();
+  #pragma omp masked taskloop collapse (2) // expected-note {{as specified in 'collapse' clause}}
+  foo(); // expected-error {{expected 2 for loops after '#pragma omp masked taskloop'}}
+  // expected-note@+1 {{in instantiation of function template specialization 'tmain<int, char, 1, 0>' requested here}}
+  return tmain<int, char, 1, 0>(argc, argv);
+}
+
diff --git a/clang/test/OpenMP/masked_taskloop_final_messages.cpp b/clang/test/OpenMP/masked_taskloop_final_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_final_messages.cpp
@@ -0,0 +1,94 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 100 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+#pragma omp masked taskloop final // expected-error {{expected '(' after 'final'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final() // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc > 0 ? argv[1] : argv[2] + z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(foobool(argc)), final(true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'final' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(S) // expected-error {{'S' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argv[1] = 2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc)
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  int z;
+#pragma omp masked taskloop final // expected-error {{expected '(' after 'final'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final() // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc > 0 ? argv[1] : argv[2] - z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(foobool(argc)), final(true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'final' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argv[1] = 2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(1 0) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp masked taskloop final(if (tmain(argc, argv) // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return tmain(argc, argv);
+}
diff --git a/clang/test/OpenMP/masked_taskloop_firstprivate_messages.cpp b/clang/test/OpenMP/masked_taskloop_firstprivate_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_firstprivate_messages.cpp
@@ -0,0 +1,336 @@
+// RUN: %clang_cc1 -verify -fopenmp %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd %s -Wuninitialized
+
+typedef void **omp_allocator_handle_t;
+extern const omp_allocator_handle_t omp_null_allocator;
+extern const omp_allocator_handle_t omp_default_mem_alloc;
+extern const omp_allocator_handle_t omp_large_cap_mem_alloc;
+extern const omp_allocator_handle_t omp_const_mem_alloc;
+extern const omp_allocator_handle_t omp_high_bw_mem_alloc;
+extern const omp_allocator_handle_t omp_low_lat_mem_alloc;
+extern const omp_allocator_handle_t omp_cgroup_mem_alloc;
+extern const omp_allocator_handle_t omp_pteam_mem_alloc;
+extern const omp_allocator_handle_t omp_thread_mem_alloc;
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+void xxx(int argc) {
+  int fp; // expected-note {{initialize the variable 'fp' to silence this warning}}
+#pragma omp masked taskloop firstprivate(fp) // expected-warning {{variable 'fp' is uninitialized when used here}}
+  for (int i = 0; i < 10; ++i)
+    ;
+}
+
+struct S1; // expected-note 2 {{declared here}} expected-note 2 {{forward declaration of 'S1'}}
+extern S1 a;
+class S2 {
+  mutable int a;
+
+public:
+  S2() : a(0) {}
+  S2(const S2 &s2) : a(s2.a) {}
+  static float S2s;
+  static const float S2sc;
+};
+const float S2::S2sc = 0;
+const S2 b;
+const S2 ba[5];
+class S3 {
+  int a;
+  S3 &operator=(const S3 &s3);
+
+public:
+  S3() : a(0) {} // expected-note 2 {{candidate constructor not viable: requires 0 arguments, but 1 was provided}}
+  S3(S3 &s3) : a(s3.a) {} // expected-note 2 {{candidate constructor not viable: 1st argument ('const S3') would lose const qualifier}}
+};
+const S3 c;
+const S3 ca[5];
+extern const int f;
+class S4 {
+  int a;
+  S4();
+  S4(const S4 &s4); // expected-note 2 {{implicitly declared private here}}
+
+public:
+  S4(int v) : a(v) {}
+};
+class S5 {
+  int a;
+  S5(const S5 &s5) : a(s5.a) {} // expected-note 4 {{implicitly declared private here}}
+
+public:
+  S5() : a(0) {}
+  S5(int v) : a(v) {}
+};
+class S6 {
+  int a;
+  S6() : a(0) {}
+
+public:
+  S6(const S6 &s6) : a(s6.a) {}
+  S6(int v) : a(v) {}
+};
+
+S3 h;
+#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
+
+template <class I, class C>
+int foomain(int argc, char **argv) {
+  I e(4);
+  C g(5);
+  int i, z;
+  int &j = i;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate // expected-error {{expected '(' after 'firstprivate'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate() // expected-error {{expected expression}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop allocate(omp_thread_mem_alloc: argc) firstprivate(argc) // expected-warning {{allocator with the 'thread' trait access has unspecified behavior on 'masked taskloop' directive}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(S1) // expected-error {{'S1' does not refer to a value}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(a, b) // expected-error {{firstprivate variable with incomplete type 'S1'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argv[1]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(z, e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(h) // expected-error {{threadprivate or thread local variable cannot be firstprivate}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+  {
+    int v = 0;
+    int i;
+#pragma omp masked taskloop firstprivate(i)
+    for (int k = 0; k < argc; ++k) {
+      i = k;
+      v += i;
+    }
+  }
+#pragma omp parallel shared(i)
+#pragma omp parallel private(i)
+#pragma omp masked taskloop firstprivate(j)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(i)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(g) firstprivate(g) // expected-error {{calling a private constructor of class 'S5'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel private(i)
+#pragma omp masked taskloop firstprivate(i) // expected-note 2 {{defined as firstprivate}}
+  for (i = 0; i < argc; ++i) // expected-error 2 {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+    foo();
+#pragma omp parallel reduction(+ : i)  // expected-note {{defined as reduction}}
+#pragma omp masked taskloop firstprivate(i) // expected-note {{defined as firstprivate}} expected-error {{argument of a reduction clause of a parallel construct must not appear in a firstprivate clause on a task construct}}
+  for (i = 0; i < argc; ++i) // expected-error {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+    foo();
+  return 0;
+}
+
+void bar(S4 a[2]) {
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(a)
+  for (int i = 0; i < 2; ++i)
+    foo();
+}
+
+namespace A {
+double x;
+#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
+}
+namespace B {
+using A::x;
+}
+
+int main(int argc, char **argv) {
+  const int d = 5;
+  const int da[5] = {0};
+  S4 e(4);
+  S5 g(5);
+  S3 m;
+  S6 n(2);
+  int i;
+  int &j = i;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate // expected-error {{expected '(' after 'firstprivate'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate() // expected-error {{expected expression}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argc) allocate , allocate(, allocate(omp_default , allocate(omp_default_mem_alloc, allocate(omp_default_mem_alloc:, allocate(omp_default_mem_alloc: argc, allocate(omp_default_mem_alloc: argv), allocate(argv) // expected-error {{expected '(' after 'allocate'}} expected-error 2 {{expected expression}} expected-error 2 {{expected ')'}} expected-error {{use of undeclared identifier 'omp_default'}} expected-note 2 {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(S1) // expected-error {{'S1' does not refer to a value}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(a, b, c, d, f) // expected-error {{firstprivate variable with incomplete type 'S1'}} expected-error {{no matching constructor for initialization of 'S3'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(argv[1]) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(2 * 2) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(ba) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(ca) // expected-error {{no matching constructor for initialization of 'S3'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(da) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+  int xa;
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(xa) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(S2::S2s) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(S2::S2sc) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop safelen(5) // expected-error {{unexpected OpenMP clause 'safelen' in directive '#pragma omp masked taskloop'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(m) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(h) // expected-error {{threadprivate or thread local variable cannot be firstprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop private(xa), firstprivate(xa) // expected-error {{private variable cannot be firstprivate}} expected-note {{defined as private}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(i) // expected-note {{defined as firstprivate}}
+  for (i = 0; i < argc; ++i)    // expected-error {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+    foo();
+#pragma omp parallel shared(xa)
+#pragma omp masked taskloop firstprivate(xa) // OK: may be firstprivate
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(j)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(g) firstprivate(g) // expected-error {{calling a private constructor of class 'S5'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(n) firstprivate(n) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+  {
+    int v = 0;
+    int i;
+#pragma omp masked taskloop firstprivate(i)
+    for (int k = 0; k < argc; ++k) {
+      i = k;
+      v += i;
+    }
+  }
+#pragma omp parallel private(i)
+#pragma omp masked taskloop firstprivate(i) // expected-note {{defined as firstprivate}}
+  for (i = 0; i < argc; ++i) // expected-error {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+    foo();
+#pragma omp parallel reduction(+ : i) // expected-note {{defined as reduction}}
+#pragma omp masked taskloop firstprivate(i) //expected-error {{argument of a reduction clause of a parallel construct must not appear in a firstprivate clause on a task construct}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp masked taskloop firstprivate(i) //expected-note {{defined as firstprivate}}
+  for (i = 0; i < argc; ++i) // expected-error {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(B::x) // expected-error {{threadprivate or thread local variable cannot be firstprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+  static int si;
+#pragma omp masked taskloop firstprivate(si) // OK
+  for (i = 0; i < argc; ++i)
+    si = i + 1;
+
+  return foomain<S4, S5>(argc, argv); // expected-note {{in instantiation of function template specialization 'foomain<S4, S5>' requested here}}
+}
+
diff --git a/clang/test/OpenMP/masked_taskloop_grainsize_messages.cpp b/clang/test/OpenMP/masked_taskloop_grainsize_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_grainsize_messages.cpp
@@ -0,0 +1,103 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 100 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp masked taskloop grainsize // expected-error {{expected '(' after 'grainsize'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc > 0 ? argv[1][0] : argv[2][argc] + z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (foobool(argc)), grainsize (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'grainsize' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (S) // expected-error {{'S' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(0) // expected-error {{argument to 'grainsize' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(-1) // expected-error {{argument to 'grainsize' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(argc) num_tasks(argc) // expected-error {{'num_tasks' and 'grainsize' clause are mutually exclusive and may not appear on the same directive}} expected-note {{'grainsize' clause is specified here}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  int z;
+  #pragma omp masked taskloop grainsize // expected-error {{expected '(' after 'grainsize'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc > 0 ? argv[1][0] : argv[2][argc] + z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (foobool(argc)), grainsize (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'grainsize' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize (1 0) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(if(tmain(argc, argv) // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(0)  // expected-error {{argument to 'grainsize' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(-1) // expected-error {{argument to 'grainsize' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop grainsize(argc) num_tasks(argc) // expected-error {{'num_tasks' and 'grainsize' clause are mutually exclusive and may not appear on the same directive}} expected-note {{'grainsize' clause is specified here}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return tmain(argc, argv);
+}
diff --git a/clang/test/OpenMP/masked_taskloop_in_reduction_messages.cpp b/clang/test/OpenMP/masked_taskloop_in_reduction_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_in_reduction_messages.cpp
@@ -0,0 +1,393 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 150 -o - %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp -std=c++98 -ferror-limit 150 -o - %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp -std=c++11 -ferror-limit 150 -o - %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 150 -o - %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -std=c++98 -ferror-limit 150 -o - %s -Wuninitialized
+// RUN: %clang_cc1 -verify -fopenmp-simd -std=c++11 -ferror-limit 150 -o - %s -Wuninitialized
+
+typedef void **omp_allocator_handle_t;
+extern const omp_allocator_handle_t omp_null_allocator;
+extern const omp_allocator_handle_t omp_default_mem_alloc;
+extern const omp_allocator_handle_t omp_large_cap_mem_alloc;
+extern const omp_allocator_handle_t omp_const_mem_alloc;
+extern const omp_allocator_handle_t omp_high_bw_mem_alloc;
+extern const omp_allocator_handle_t omp_low_lat_mem_alloc;
+extern const omp_allocator_handle_t omp_cgroup_mem_alloc;
+extern const omp_allocator_handle_t omp_pteam_mem_alloc;
+extern const omp_allocator_handle_t omp_thread_mem_alloc;
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+void foobar(int &ref) {
+  int tid = 0;
+#pragma omp taskgroup task_reduction(+:ref)
+#pragma omp masked taskloop filter(tid) in_reduction(+:ref)
+  for (int i = 0; i < 10; ++i)
+  foo();
+}
+
+void foobar1(int &ref) {
+#pragma omp taskgroup task_reduction(+:ref)
+#pragma omp masked taskloop in_reduction(-:ref)
+  for (int i = 0; i < 10; ++i)
+  foo();
+}
+
+#pragma omp declare reduction (red:int:omp_out += omp_in)
+
+void foobar2(int &ref) {
+#pragma omp taskgroup task_reduction(+:ref) // expected-note {{previously marked as task_reduction with different reduction operation}}
+#pragma omp masked taskloop in_reduction(red:ref) // expected-error{{in_reduction variable must have the same reduction operation as in a task_reduction clause}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+}
+
+void foobar3(int &ref) {
+#pragma omp taskgroup task_reduction(red:ref) // expected-note {{previously marked as task_reduction with different reduction operation}}
+#pragma omp masked taskloop in_reduction(min:ref)  // expected-error{{in_reduction variable must have the same reduction operation as in a task_reduction clause}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+}
+
+void foobar4(int &ref) {
+  int tid = 0;
+#pragma omp masked taskloop filter(tid) in_reduction(min:ref)
+  for (int i = 0; i < 10; ++i)
+  foo();
+}
+
+struct S1; // expected-note {{declared here}} expected-note 4 {{forward declaration of 'S1'}}
+extern S1 a;
+class S2 {
+  mutable int a;
+  S2 &operator+(const S2 &arg) { return (*this); } // expected-note 3 {{implicitly declared private here}}
+
+public:
+  S2() : a(0) {}
+  S2(S2 &s2) : a(s2.a) {}
+  static float S2s; // expected-note 2 {{static data member is predetermined as shared}}
+  static const float S2sc; // expected-note 2 {{'S2sc' declared here}}
+};
+const float S2::S2sc = 0;
+S2 b;                     // expected-note 3 {{'b' defined here}}
+const S2 ba[5];           // expected-note 2 {{'ba' defined here}}
+class S3 {
+  int a;
+
+public:
+  int b;
+  S3() : a(0) {}
+  S3(const S3 &s3) : a(s3.a) {}
+  S3 operator+(const S3 &arg1) { return arg1; }
+};
+int operator+(const S3 &arg1, const S3 &arg2) { return 5; }
+S3 c;               // expected-note 3 {{'c' defined here}}
+const S3 ca[5];     // expected-note 2 {{'ca' defined here}}
+extern const int f; // expected-note 4 {{'f' declared here}}
+class S4 {
+  int a;
+  S4(); // expected-note {{implicitly declared private here}}
+  S4(const S4 &s4);
+  S4 &operator+(const S4 &arg) { return (*this); }
+
+public:
+  S4(int v) : a(v) {}
+};
+S4 &operator&=(S4 &arg1, S4 &arg2) { return arg1; }
+class S5 {
+  int a;
+  S5() : a(0) {} // expected-note {{implicitly declared private here}}
+  S5(const S5 &s5) : a(s5.a) {}
+  S5 &operator+(const S5 &arg);
+
+public:
+  S5(int v) : a(v) {}
+};
+class S6 { // expected-note 3 {{candidate function (the implicit copy assignment operator) not viable: no known conversion from 'int' to 'const S6' for 1st argument}}
+#if __cplusplus >= 201103L // C++11 or later
+// expected-note@-2 3 {{candidate function (the implicit move assignment operator) not viable}}
+#endif
+  int a;
+
+public:
+  S6() : a(6) {}
+  operator int() { return 6; }
+} o;
+
+S3 h, k;
+#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
+
+template <class T>       // expected-note {{declared here}}
+T tmain(T argc) {
+  const T d = T();       // expected-note 4 {{'d' defined here}}
+  const T da[5] = {T()}; // expected-note 2 {{'da' defined here}}
+  T qa[5] = {T()};
+  T i;
+  T &j = i;                    // expected-note 2 {{'j' defined here}}
+  S3 &p = k;                   // expected-note 2 {{'p' defined here}}
+  const T &r = da[(int)i];     // expected-note 2 {{'r' defined here}}
+  T &q = qa[(int)i];
+  T fl;
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction // expected-error {{expected '(' after 'in_reduction'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction + // expected-error {{expected '(' after 'in_reduction'}} expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction( // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction(- // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction() // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction(*) // expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:argc)
+#pragma omp masked taskloop in_reduction(\) // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(&:argc) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
+#pragma omp masked taskloop in_reduction(& : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(|:argc) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
+#pragma omp masked taskloop in_reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{invalid operands to binary expression ('float' and 'float')}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(|| : argc ? i : argc) // expected-error 2 {{expected variable name, array element or array section}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(foo : argc) //expected-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'float'}} expected-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max' or declare reduction for type 'int'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(&&:argc)
+#pragma omp masked taskloop in_reduction(&& : argc) allocate , allocate(, allocate(omp_default , allocate(omp_default_mem_alloc, allocate(omp_default_mem_alloc:, allocate(omp_default_mem_alloc: argc, allocate(omp_default_mem_alloc: argv), allocate(argv) // expected-error {{expected '(' after 'allocate'}} expected-error 2 {{expected expression}} expected-error 2 {{expected ')'}} expected-error {{use of undeclared identifier 'omp_default'}} expected-note 2 {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(^ : T) // expected-error {{'T' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:c)
+#pragma omp masked taskloop in_reduction(+ : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 3 {{const-qualified variable cannot be in_reduction}} expected-error 2 {{'operator+' is a private member of 'S2'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(min : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 4 {{arguments of OpenMP clause 'in_reduction' for 'min' or 'max' must be of arithmetic type}} expected-error 3 {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(max : h.b) // expected-error {{expected variable name, array element or array section}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : ba) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(* : ca) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(- : da) // expected-error {{const-qualified variable cannot be in_reduction}} expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(^ : fl) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(&& : S2::S2s) // expected-error {{shared variable cannot be reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(&& : S2::S2sc) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:k)
+#pragma omp masked taskloop in_reduction(+ : h, k) // expected-error {{threadprivate or thread local variable cannot be reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : o) // expected-error 2 {{no viable overloaded '='}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp parallel private(k)
+#pragma omp masked taskloop in_reduction(+ : p), in_reduction(+ : p) // expected-error 2 {{argument of OpenMP clause 'in_reduction' must reference the same object in all threads}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:p)
+#pragma omp masked taskloop in_reduction(+ : p), in_reduction(+ : p) // expected-error 2 {{variable can appear only once in OpenMP 'in_reduction' clause}} expected-note 2 {{previously referenced here}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : r) // expected-error 2 {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp parallel shared(i)
+#pragma omp parallel reduction(min : i)
+#pragma omp masked taskloop in_reduction(max : j) // expected-error 2 {{argument of OpenMP clause 'in_reduction' must reference the same object in all threads}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:fl)
+{
+#pragma omp masked taskloop in_reduction(+ : fl) allocate(omp_thread_mem_alloc: fl) // expected-warning 2 {{allocator with the 'thread' trait access has unspecified behavior on 'masked taskloop' directive}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+#pragma omp taskgroup task_reduction(*:fl) // expected-note 2 {{previously marked as task_reduction with different reduction operation}}
+{
+#pragma omp masked taskloop in_reduction(+ : fl) // expected-error 2 {{in_reduction variable must have the same reduction operation as in a task_reduction clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+}
+}
+#pragma omp parallel
+#pragma omp for reduction(- : fl)
+  for (int i = 0; i < 10; ++i)
+#pragma omp taskgroup task_reduction(+:fl)
+#pragma omp masked taskloop in_reduction(+ : fl)
+  for (int j = 0; j < 10; ++j)
+    foo();
+
+  return T();
+}
+
+namespace A {
+double x;
+#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
+}
+namespace B {
+using A::x;
+}
+
+int main(int argc, char **argv) {
+  const int d = 5;       // expected-note 2 {{'d' defined here}}
+  const int da[5] = {0}; // expected-note {{'da' defined here}}
+  int qa[5] = {0};
+  S4 e(4);
+  S5 g(5);
+  int i;
+  int &j = i;                  // expected-note {{'j' defined here}}
+  S3 &p = k;                   // expected-note 2 {{'p' defined here}}
+  const int &r = da[i];        // expected-note {{'r' defined here}}
+  int &q = qa[i];
+  float fl;
+#pragma omp masked taskloop in_reduction // expected-error {{expected '(' after 'in_reduction'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction + // expected-error {{expected '(' after 'in_reduction'}} expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction( // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(- // expected-warning {{missing ':' after reduction identifier - ignoring}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction() // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(*) // expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(\) // expected-error {{expected unqualified-id}} expected-warning {{missing ':' after reduction identifier - ignoring}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(foo : argc // expected-error {{expected ')'}} expected-note {{to match this '('}} expected-error {{incorrect reduction identifier, expected one of '+', '-', '*', '&', '|', '^', '&&', '||', 'min' or 'max'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(|:argc)
+#pragma omp masked taskloop in_reduction(| : argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(|| : argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name, array element or array section}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(~ : argc) // expected-error {{expected unqualified-id}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(&&:argc)
+#pragma omp masked taskloop in_reduction(&& : argc)
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(^ : S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:c)
+#pragma omp masked taskloop in_reduction(+ : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 2 {{const-qualified variable cannot be in_reduction}} expected-error {{'operator+' is a private member of 'S2'}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(min : a, b, c, d, f) // expected-error {{a reduction list item with incomplete type 'S1'}} expected-error 2 {{arguments of OpenMP clause 'in_reduction' for 'min' or 'max' must be of arithmetic type}} expected-error 2 {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(max : h.b) // expected-error {{expected variable name, array element or array section}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : ba) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(* : ca) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(- : da) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(^ : fl) // expected-error {{invalid operands to binary expression ('float' and 'float')}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(&& : S2::S2s) // expected-error {{shared variable cannot be reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(&& : S2::S2sc) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(& : e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}} expected-error {{invalid operands to binary expression ('S5' and 'S5')}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:k)
+#pragma omp masked taskloop in_reduction(+ : h, k, B::x) // expected-error 2 {{threadprivate or thread local variable cannot be reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : o) // expected-error {{no viable overloaded '='}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp parallel private(k)
+#pragma omp masked taskloop in_reduction(+ : p), in_reduction(+ : p) // expected-error 2 {{argument of OpenMP clause 'in_reduction' must reference the same object in all threads}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp taskgroup task_reduction(+:p)
+#pragma omp masked taskloop in_reduction(+ : p), in_reduction(+ : p) // expected-error {{variable can appear only once in OpenMP 'in_reduction' clause}} expected-note {{previously referenced here}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp masked taskloop in_reduction(+ : r) // expected-error {{const-qualified variable cannot be in_reduction}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp parallel shared(i)
+#pragma omp parallel reduction(min : i)
+#pragma omp masked taskloop in_reduction(max : j) // expected-error {{argument of OpenMP clause 'in_reduction' must reference the same object in all threads}}
+  for (int i = 0; i < 10; ++i)
+  foo();
+#pragma omp parallel
+#pragma omp for private(fl)
+  for (int i = 0; i < 10; ++i)
+#pragma omp taskgroup task_reduction(+:fl)
+#pragma omp masked taskloop in_reduction(+ : fl)
+  for (int j = 0; j < 10; ++j)
+    foo();
+#pragma omp taskgroup task_reduction(+:fl)
+#pragma omp masked taskloop in_reduction(+ : fl)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  static int m;
+#pragma omp taskgroup task_reduction(+:m)
+#pragma omp masked taskloop in_reduction(+ : m) // OK
+  for (int i = 0; i < 10; ++i)
+  m++;
+
+  return tmain(argc) + tmain(fl); // expected-note {{in instantiation of function template specialization 'tmain<int>' requested here}} expected-note {{in instantiation of function template specialization 'tmain<float>' requested here}}
+}
diff --git a/clang/test/OpenMP/masked_taskloop_lastprivate_messages.cpp b/clang/test/OpenMP/masked_taskloop_lastprivate_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_lastprivate_messages.cpp
@@ -0,0 +1,306 @@
+// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-version=45 -fopenmp %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify=expected,omp45 -fopenmp-version=45 -fopenmp-simd %s -Wuninitialized
+// RUN: %clang_cc1 -verify=expected,omp50 -fopenmp-simd %s -Wuninitialized
+
+typedef void **omp_allocator_handle_t;
+extern const omp_allocator_handle_t omp_null_allocator;
+extern const omp_allocator_handle_t omp_default_mem_alloc;
+extern const omp_allocator_handle_t omp_large_cap_mem_alloc;
+extern const omp_allocator_handle_t omp_const_mem_alloc;
+extern const omp_allocator_handle_t omp_high_bw_mem_alloc;
+extern const omp_allocator_handle_t omp_low_lat_mem_alloc;
+extern const omp_allocator_handle_t omp_cgroup_mem_alloc;
+extern const omp_allocator_handle_t omp_pteam_mem_alloc;
+extern const omp_allocator_handle_t omp_thread_mem_alloc;
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note 2 {{declared here}} expected-note 2 {{forward declaration of 'S1'}}
+extern S1 a;
+class S2 {
+  mutable int a;
+
+public:
+  S2() : a(0) {}
+  S2(S2 &s2) : a(s2.a) {}
+  const S2 &operator =(const S2&) const;
+  S2 &operator =(const S2&);
+  static float S2s; // expected-note {{static data member is predetermined as shared}}
+  static const float S2sc; // expected-note {{'S2sc' declared here}}
+};
+const float S2::S2sc = 0;
+const S2 b;
+const S2 ba[5];
+class S3 {
+  int a;
+  S3 &operator=(const S3 &s3); // expected-note 2 {{implicitly declared private here}}
+
+public:
+  S3() : a(0) {}
+  S3(S3 &s3) : a(s3.a) {}
+};
+const S3 c;         // expected-note {{'c' defined here}}
+const S3 ca[5];     // expected-note {{'ca' defined here}}
+extern const int f; // expected-note {{'f' declared here}}
+class S4 {
+  int a;
+  S4();             // expected-note 3 {{implicitly declared private here}}
+  S4(const S4 &s4);
+
+public:
+  S4(int v) : a(v) {}
+};
+class S5 {
+  int a;
+  S5() : a(0) {} // expected-note {{implicitly declared private here}}
+
+public:
+  S5(const S5 &s5) : a(s5.a) {}
+  S5(int v) : a(v) {}
+};
+class S6 {
+  int a;
+  S6() : a(0) {}
+
+public:
+  S6(const S6 &s6) : a(s6.a) {}
+  S6(int v) : a(v) {}
+};
+
+S3 h;
+#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
+
+template <class I, class C>
+int foomain(int argc, char **argv) {
+  I e(4);
+  I g(5);
+  int i, z;
+  int &j = i;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate // expected-error {{expected '(' after 'lastprivate'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate() // expected-error {{expected expression}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc) allocate , allocate(, allocate(omp_default , allocate(omp_default_mem_alloc, allocate(omp_default_mem_alloc:, allocate(omp_default_mem_alloc: argc, allocate(omp_default_mem_alloc: argv), allocate(argv) // expected-error {{expected '(' after 'allocate'}} expected-error 2 {{expected expression}} expected-error 2 {{expected ')'}} expected-error {{use of undeclared identifier 'omp_default'}} expected-note 2 {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(conditional: argc) lastprivate(conditional: // expected-error 2 {{use of undeclared identifier 'conditional'}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(S1) // expected-error {{'S1' does not refer to a value}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(a, b) // expected-error {{lastprivate variable with incomplete type 'S1'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argv[1]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(z, e, g) // expected-error 2 {{calling a private constructor of class 'S4'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(h) // expected-error {{threadprivate or thread local variable cannot be lastprivate}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+  {
+    int v = 0;
+    int i;
+#pragma omp masked taskloop allocate(omp_thread_mem_alloc: i) lastprivate(i) // expected-warning {{allocator with the 'thread' trait access has unspecified behavior on 'masked taskloop' directive}}
+    for (int k = 0; k < argc; ++k) {
+      i = k;
+      v += i;
+    }
+  }
+#pragma omp parallel shared(i)
+#pragma omp parallel private(i)
+#pragma omp masked taskloop lastprivate(j)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(i)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+  return 0;
+}
+
+void bar(S4 a[2]) {
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(a)
+  for (int i = 0; i < 2; ++i)
+    foo();
+}
+
+namespace A {
+double x;
+#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
+}
+namespace B {
+using A::x;
+}
+
+int main(int argc, char **argv) {
+  const int d = 5;       // expected-note {{'d' defined here}}
+  const int da[5] = {0}; // expected-note {{'da' defined here}}
+  S4 e(4);
+  S5 g(5);
+  S3 m;
+  S6 n(2);
+  int i, z;
+  int &j = i;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate // expected-error {{expected '(' after 'lastprivate'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate() // expected-error {{expected expression}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argc, z)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(S1) // expected-error {{'S1' does not refer to a value}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(a, b, c, d, f) // expected-error {{lastprivate variable with incomplete type 'S1'}} expected-error 1 {{const-qualified variable without mutable fields cannot be lastprivate}} expected-error 2 {{const-qualified variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(argv[1]) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(2 * 2) // expected-error {{expected variable name}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(ba)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(ca) // expected-error {{const-qualified variable without mutable fields cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(da) // expected-error {{const-qualified variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+  int xa;
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(xa) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(S2::S2s) // expected-error {{shared variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(S2::S2sc) // expected-error {{const-qualified variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop safelen(5) // expected-error {{unexpected OpenMP clause 'safelen' in directive '#pragma omp masked taskloop'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(m) // expected-error {{'operator=' is a private member of 'S3'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(h) // expected-error {{threadprivate or thread local variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(B::x) // expected-error {{threadprivate or thread local variable cannot be lastprivate}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop private(xa), lastprivate(xa) // expected-error {{private variable cannot be lastprivate}} expected-note {{defined as private}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(i)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel private(xa)
+#pragma omp masked taskloop lastprivate(xa)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel reduction(+ : xa)
+#pragma omp masked taskloop lastprivate(xa)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(j)
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop firstprivate(m) lastprivate(m) // expected-error {{'operator=' is a private member of 'S3'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(n) firstprivate(n) // OK
+  for (i = 0; i < argc; ++i)
+    foo();
+  static int si;
+#pragma omp masked taskloop lastprivate(si) // OK
+  for (i = 0; i < argc; ++i)
+    si = i + 1;
+  return foomain<S4, S5>(argc, argv); // expected-note {{in instantiation of function template specialization 'foomain<S4, S5>' requested here}}
+}
diff --git a/clang/test/OpenMP/masked_taskloop_loop_messages.cpp b/clang/test/OpenMP/masked_taskloop_loop_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_loop_messages.cpp
@@ -0,0 +1,741 @@
+// RUN: %clang_cc1 -fsyntax-only -fopenmp -fopenmp-version=45 -x c++ -std=c++11 -fexceptions -fcxx-exceptions -verify=expected,omp4 %s -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -fopenmp -x c++ -std=c++11 -fexceptions -fcxx-exceptions -verify=expected,omp5 %s -Wuninitialized
+
+// RUN: %clang_cc1 -fsyntax-only -fopenmp-simd -fopenmp-version=45 -x c++ -std=c++11 -fexceptions -fcxx-exceptions -verify=expected,omp4 %s -Wuninitialized
+// RUN: %clang_cc1 -fsyntax-only -fopenmp-simd -x c++ -std=c++11 -fexceptions -fcxx-exceptions -verify=expected,omp5 %s -Wuninitialized
+
+class S {
+  int a;
+  S() : a(0) {}
+
+public:
+  S(int v) : a(v) {}
+  S(const S &s) : a(s.a) {}
+};
+
+static int sii;
+// expected-note@+1 {{defined as threadprivate or thread local}}
+#pragma omp threadprivate(sii)
+static int globalii;
+
+// Currently, we cannot use "0" for global register variables.
+// register int reg0 __asm__("0");
+int reg0;
+
+int test_iteration_spaces() {
+  const int N = 100;
+  float a[N], b[N], c[N];
+  int ii, jj, kk;
+  float fii;
+  double dii;
+  register int reg; // expected-warning {{'register' storage class specifier is deprecated}}
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; i += 1) {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (char i = 0; i < 10; i++) {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (char i = 0; i < 10; i += '\1') {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (long long i = 0; i < 10; i++) {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+// expected-error@+2 {{expression must have integral or unscoped enumeration type, not 'double'}}
+#pragma omp masked taskloop
+  for (long long i = 0; i < 10; i += 1.5) {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (long long i = 0; i < 'z'; i += 1u) {
+    c[i] = a[i] + b[i];
+  }
+#pragma omp parallel
+// expected-error@+2 {{variable must be of integer or random access iterator type}}
+#pragma omp masked taskloop
+  for (float fi = 0; fi < 10.0; fi++) {
+    c[(int)fi] = a[(int)fi] + b[(int)fi];
+  }
+#pragma omp parallel
+// expected-error@+2 {{variable must be of integer or random access iterator type}}
+#pragma omp masked taskloop
+  for (double fi = 0; fi < 10.0; fi++) {
+    c[(int)fi] = a[(int)fi] + b[(int)fi];
+  }
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (int &ref = ii; ref < 10; ref++) {
+  }
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (int i; i < 10; i++)
+    c[i] = a[i];
+
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (int i = 0, j = 0; i < 10; ++i)
+    c[i] = a[i];
+
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (; ii < 10; ++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-warning@+3 {{expression result unused}}
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (ii + 1; ii < 10; ++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (c[ii] = 0; ii < 10; ++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// Ok to skip parenthesises.
+#pragma omp masked taskloop
+  for (((ii)) = 0; ii < 10; ++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'i'}}
+#pragma omp masked taskloop
+  for (int i = 0; i; i++)
+    c[i] = a[i];
+
+#pragma omp parallel
+// omp4-error@+3 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}} omp5-error@+3 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'i'}}
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'i'}}
+#pragma omp masked taskloop
+  for (int i = 0; jj < kk; ii++)
+    c[i] = a[i];
+
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'i'}}
+#pragma omp masked taskloop
+  for (int i = 0; !!i; i++)
+    c[i] = a[i];
+
+// Ok
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
+#pragma omp masked taskloop
+  for (int i = 0; i != 1; i++)
+    c[i] = a[i];
+
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'i'}}
+#pragma omp masked taskloop
+  for (int i = 0;; i++)
+    c[i] = a[i];
+
+#pragma omp parallel
+// Ok.
+#pragma omp masked taskloop
+  for (int i = 11; i > 10; i--)
+    c[i] = a[i];
+
+#pragma omp parallel
+// Ok.
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; ++i)
+    c[i] = a[i];
+
+#pragma omp parallel
+// Ok.
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ++jj)
+    c[ii] = a[jj];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ++++ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// Ok but undefined behavior (in general, cannot check that incr
+// is really loop-invariant).
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii + ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{expression must have integral or unscoped enumeration type, not 'float'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii + 1.0f)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// Ok - step was converted to integer type.
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii + (int)1.1f)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; jj = ii + 2)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-warning@+3 {{relational comparison result unused}}
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii<10; jj> kk + 2)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10;)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-warning@+3 {{expression result unused}}
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; !ii)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii ? ++ii : ++jj)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii < 10)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii + 0)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; ii = ii + (int)(0.8 - 0.45))
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; (ii) < 10; ii -= 25)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; (ii < 10); ii -= 0)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; ii > 10; (ii += 0))
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; ii < 10; (ii) = (1 - 1) + (ii))
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for ((ii = 0); ii > 10; (ii -= 0))
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (ii = 0; (ii < 10); (ii -= 0))
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-note@+2  {{defined as firstprivate}}
+// expected-error@+2 {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be firstprivate, predetermined as private}}
+#pragma omp masked taskloop firstprivate(ii)
+  for (ii = 0; ii < 10; ii++)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+// expected-error@+1 {{unexpected OpenMP clause 'linear' in directive '#pragma omp masked taskloop'}}
+#pragma omp masked taskloop linear(ii)
+  for (ii = 0; ii < 10; ii++)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+#pragma omp masked taskloop private(ii)
+  for (ii = 0; ii < 10; ii++)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(ii)
+  for (ii = 0; ii < 10; ii++)
+    c[ii] = a[ii];
+
+#pragma omp parallel
+  {
+// expected-error@+2 {{loop iteration variable in the associated loop of 'omp masked taskloop' directive may not be threadprivate or thread local, predetermined as private}}
+#pragma omp masked taskloop
+    for (sii = 0; sii < 10; sii += 1)
+      c[sii] = a[sii];
+  }
+
+#pragma omp parallel
+  {
+#pragma omp masked taskloop
+    for (reg0 = 0; reg0 < 10; reg0 += 1)
+      c[reg0] = a[reg0];
+  }
+
+#pragma omp parallel
+  {
+#pragma omp masked taskloop
+    for (reg = 0; reg < 10; reg += 1)
+      c[reg] = a[reg];
+  }
+
+#pragma omp parallel
+  {
+#pragma omp masked taskloop
+    for (globalii = 0; globalii < 10; globalii += 1)
+      c[globalii] = a[globalii];
+  }
+
+#pragma omp parallel
+  {
+#pragma omp masked taskloop collapse(2)
+    for (ii = 0; ii < 10; ii += 1)
+    for (globalii = 0; globalii < 10; globalii += 1)
+      c[globalii] += a[globalii] + ii;
+  }
+
+#pragma omp parallel
+// omp4-error@+2 {{statement after '#pragma omp masked taskloop' must be a for loop}}
+#pragma omp masked taskloop
+  for (auto &item : a) {
+    item = item + 1;
+  }
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'i' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (unsigned i = 9; i < 10; i--) {
+    c[i] = a[i] + b[i];
+  }
+
+  int(*lb)[4] = nullptr;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int(*p)[4] = lb; p < lb + 8; ++p) {
+  }
+
+#pragma omp parallel
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (int a{0}; a < 10; ++a) {
+  }
+
+  return 0;
+}
+
+// Iterators allowed in openmp for-loops.
+namespace std {
+struct random_access_iterator_tag {};
+template <class Iter>
+struct iterator_traits {
+  typedef typename Iter::difference_type difference_type;
+  typedef typename Iter::iterator_category iterator_category;
+};
+template <class Iter>
+typename iterator_traits<Iter>::difference_type
+distance(Iter first, Iter last) { return first - last; }
+}
+class Iter0 {
+public:
+  Iter0() {}
+  Iter0(const Iter0 &) {}
+  Iter0 operator++() { return *this; }
+  Iter0 operator--() { return *this; }
+  bool operator<(Iter0 a) { return true; }
+};
+// expected-note@+2 {{candidate function not viable: no known conversion from 'GoodIter' to 'Iter0' for 1st argument}}
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter1' to 'Iter0' for 1st argument}}
+int operator-(Iter0 a, Iter0 b) { return 0; }
+class Iter1 {
+public:
+  Iter1(float f = 0.0f, double d = 0.0) {}
+  Iter1(const Iter1 &) {}
+  Iter1 operator++() { return *this; }
+  Iter1 operator--() { return *this; }
+  bool operator<(Iter1 a) { return true; }
+  bool operator>=(Iter1 a) { return false; }
+};
+class GoodIter {
+public:
+  GoodIter() {}
+  GoodIter(const GoodIter &) {}
+  GoodIter(int fst, int snd) {}
+  GoodIter &operator=(const GoodIter &that) { return *this; }
+  GoodIter &operator=(const Iter0 &that) { return *this; }
+  GoodIter &operator+=(int x) { return *this; }
+  GoodIter &operator-=(int x) { return *this; }
+  explicit GoodIter(void *) {}
+  GoodIter operator++() { return *this; }
+  GoodIter operator--() { return *this; }
+  bool operator!() { return true; }
+  bool operator<(GoodIter a) { return true; }
+  bool operator<=(GoodIter a) { return true; }
+  bool operator>=(GoodIter a) { return false; }
+  typedef int difference_type;
+  typedef std::random_access_iterator_tag iterator_category;
+};
+// expected-note@+2 {{candidate function not viable: no known conversion from 'const Iter0' to 'GoodIter' for 2nd argument}}
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter1' to 'GoodIter' for 1st argument}}
+int operator-(GoodIter a, GoodIter b) { return 0; }
+// expected-note@+1 3 {{candidate function not viable: requires single argument 'a', but 2 arguments were provided}}
+GoodIter operator-(GoodIter a) { return a; }
+// expected-note@+2 {{candidate function not viable: no known conversion from 'const Iter0' to 'int' for 2nd argument}}
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter1' to 'GoodIter' for 1st argument}}
+GoodIter operator-(GoodIter a, int v) { return GoodIter(); }
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter0' to 'GoodIter' for 1st argument}}
+GoodIter operator+(GoodIter a, int v) { return GoodIter(); }
+// expected-note@+2 {{candidate function not viable: no known conversion from 'GoodIter' to 'int' for 1st argument}}
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter1' to 'int' for 1st argument}}
+GoodIter operator-(int v, GoodIter a) { return GoodIter(); }
+// expected-note@+1 2 {{candidate function not viable: no known conversion from 'Iter0' to 'int' for 1st argument}}
+GoodIter operator+(int v, GoodIter a) { return GoodIter(); }
+
+int test_with_random_access_iterator() {
+  GoodIter begin, end;
+  Iter0 begin0, end0;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I < end; ++I)
+    ++I;
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (GoodIter &I = begin; I < end; ++I)
+    ++I;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; --I)
+    ++I;
+#pragma omp parallel
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (GoodIter I(begin); I < end; ++I)
+    ++I;
+#pragma omp parallel
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (GoodIter I(nullptr); I < end; ++I)
+    ++I;
+#pragma omp parallel
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (GoodIter I(0); I < end; ++I)
+    ++I;
+#pragma omp parallel
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (GoodIter I(1, 2); I < end; ++I)
+    ++I;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (begin = GoodIter(0); begin < end; ++begin)
+    ++begin;
+// expected-error@+4 {{invalid operands to binary expression ('GoodIter' and 'const Iter0')}}
+// expected-error@+3 {{could not calculate number of iterations calling 'operator-' with upper and lower loop bounds}}
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (begin = begin0; begin < end; ++begin)
+    ++begin;
+#pragma omp parallel
+// expected-error@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (++begin; begin < end; ++begin)
+    ++begin;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (begin = end; begin < end; ++begin)
+    ++begin;
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'I'}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I - I; ++I)
+    ++I;
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'I'}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; begin < end; ++I)
+    ++I;
+#pragma omp parallel
+// omp4-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}} omp5-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', '>=', or '!=') of loop variable 'I'}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; !I; ++I)
+    ++I;
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; I = I + 1)
+    ++I;
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; I = I - 1)
+    ++I;
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'I'}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; I = -I)
+    ++I;
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; I = 2 + I)
+    ++I;
+#pragma omp parallel
+// expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'I'}}
+#pragma omp masked taskloop
+  for (GoodIter I = begin; I >= end; I = 2 - I)
+    ++I;
+// In the following example, we cannot update the loop variable using '+='
+// expected-error@+3 {{invalid operands to binary expression ('Iter0' and 'int')}}
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (Iter0 I = begin0; I < end0; ++I)
+    ++I;
+#pragma omp parallel
+// Initializer is constructor without params.
+// expected-error@+3 {{invalid operands to binary expression ('Iter0' and 'int')}}
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (Iter0 I; I < end0; ++I)
+    ++I;
+  Iter1 begin1, end1;
+// expected-error@+4 {{invalid operands to binary expression ('Iter1' and 'Iter1')}}
+// expected-error@+3 {{could not calculate number of iterations calling 'operator-' with upper and lower loop bounds}}
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (Iter1 I = begin1; I < end1; ++I)
+    ++I;
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (Iter1 I = begin1; I >= end1; ++I)
+    ++I;
+#pragma omp parallel
+// expected-error@+5 {{invalid operands to binary expression ('Iter1' and 'float')}}
+// expected-error@+4 {{could not calculate number of iterations calling 'operator-' with upper and lower loop bounds}}
+// Initializer is constructor with all default params.
+// expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
+#pragma omp masked taskloop
+  for (Iter1 I; I < end1; ++I) {
+  }
+  return 0;
+}
+
+template <typename IT, int ST>
+class TC {
+public:
+  int dotest_lt(IT begin, IT end) {
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+    for (IT I = begin; I < end; I = I + ST) {
+      ++I;
+    }
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be positive due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to increase on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+    for (IT I = begin; I <= end; I += ST) {
+      ++I;
+    }
+#pragma omp parallel
+#pragma omp masked taskloop
+    for (IT I = begin; I < end; ++I) {
+      ++I;
+    }
+  }
+
+  static IT step() {
+    return IT(ST);
+  }
+};
+template <typename IT, int ST = 0>
+int dotest_gt(IT begin, IT end) {
+#pragma omp parallel
+// expected-note@+3 2 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (IT I = begin; I >= end; I = I + ST) {
+    ++I;
+  }
+#pragma omp parallel
+// expected-note@+3 2 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (IT I = begin; I >= end; I += ST) {
+    ++I;
+  }
+
+#pragma omp parallel
+// expected-note@+3 {{loop step is expected to be negative due to this condition}}
+// expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
+#pragma omp masked taskloop
+  for (IT I = begin; I >= end; ++I) {
+    ++I;
+  }
+
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (IT I = begin; I < end; I += TC<int, ST>::step()) {
+    ++I;
+  }
+}
+
+void test_with_template() {
+  GoodIter begin, end;
+  TC<GoodIter, 100> t1;
+  TC<GoodIter, -100> t2;
+  t1.dotest_lt(begin, end);
+  t2.dotest_lt(begin, end);         // expected-note {{in instantiation of member function 'TC<GoodIter, -100>::dotest_lt' requested here}}
+  dotest_gt(begin, end);            // expected-note {{in instantiation of function template specialization 'dotest_gt<GoodIter, 0>' requested here}}
+  dotest_gt<unsigned, 10>(0, 100);  // expected-note {{in instantiation of function template specialization 'dotest_gt<unsigned int, 10>' requested here}}
+}
+
+void test_loop_break() {
+  const int N = 100;
+  float a[N], b[N], c[N];
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; i++) {
+    c[i] = a[i] + b[i];
+    for (int j = 0; j < 10; ++j) {
+      if (a[i] > b[j])
+        break; // OK in nested loop
+    }
+    switch (i) {
+    case 1:
+      b[i]++;
+      break;
+    default:
+      break;
+    }
+    if (c[i] > 10)
+      break; // expected-error {{'break' statement cannot be used in OpenMP for loop}}
+
+    if (c[i] > 11)
+      break; // expected-error {{'break' statement cannot be used in OpenMP for loop}}
+  }
+
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; i++) {
+    for (int j = 0; j < 10; j++) {
+      c[i] = a[i] + b[i];
+      if (c[i] > 10) {
+        if (c[i] < 20) {
+          break; // OK
+        }
+      }
+    }
+  }
+}
+
+void test_loop_eh() {
+  const int N = 100;
+  float a[N], b[N], c[N];
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; i++) {
+    c[i] = a[i] + b[i];
+    try {
+      for (int j = 0; j < 10; ++j) {
+        if (a[i] > b[j])
+          throw a[i];
+      }
+      throw a[i];
+    } catch (float f) {
+      if (f > 0.1)
+        throw a[i];
+      return; // expected-error {{cannot return from OpenMP region}}
+    }
+    switch (i) {
+    case 1:
+      b[i]++;
+      break;
+    default:
+      break;
+    }
+    for (int j = 0; j < 10; j++) {
+      if (c[i] > 10)
+        throw c[i];
+    }
+  }
+  if (c[9] > 10)
+    throw c[9]; // OK
+
+#pragma omp parallel
+#pragma omp masked taskloop
+  for (int i = 0; i < 10; ++i) {
+    struct S {
+      void g() { throw 0; }
+    };
+  }
+}
+
+void test_loop_firstprivate_lastprivate() {
+  S s(4);
+#pragma omp parallel
+#pragma omp masked taskloop lastprivate(s) firstprivate(s)
+  for (int i = 0; i < 16; ++i)
+    ;
+}
+
diff --git a/clang/test/OpenMP/masked_taskloop_num_tasks_messages.cpp b/clang/test/OpenMP/masked_taskloop_num_tasks_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_num_tasks_messages.cpp
@@ -0,0 +1,103 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 100 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp masked taskloop num_tasks // expected-error {{expected '(' after 'num_tasks'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc > 0 ? argv[1][0] : argv[2][argc] + z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (foobool(argc)), num_tasks (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'num_tasks' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (S) // expected-error {{'S' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(0) // expected-error {{argument to 'num_tasks' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(-1) // expected-error {{argument to 'num_tasks' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(argc) grainsize(argc) // expected-error {{'grainsize' and 'num_tasks' clause are mutually exclusive and may not appear on the same directive}} expected-note {{'num_tasks' clause is specified here}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  int z;
+  #pragma omp masked taskloop num_tasks // expected-error {{expected '(' after 'num_tasks'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc > 0 ? argv[1][0] : argv[2][argc] - z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (foobool(argc)), num_tasks (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'num_tasks' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks (1 0) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(if(tmain(argc, argv) // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(0)  // expected-error {{argument to 'num_tasks' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(-1) // expected-error {{argument to 'num_tasks' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop num_tasks(argc) grainsize(argc) // expected-error {{'grainsize' and 'num_tasks' clause are mutually exclusive and may not appear on the same directive}} expected-note {{'num_tasks' clause is specified here}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return tmain(argc, argv);
+}
diff --git a/clang/test/OpenMP/masked_taskloop_priority_messages.cpp b/clang/test/OpenMP/masked_taskloop_priority_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_priority_messages.cpp
@@ -0,0 +1,97 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 100 %s -Wuninitialized
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note {{declared here}}
+
+template <class T, class S> // expected-note {{declared here}}
+int tmain(T argc, S **argv) {
+  T z;
+  #pragma omp masked taskloop priority // expected-error {{expected '(' after 'priority'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc > 0 ? argv[1][0] : argv[2][argc] + z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (foobool(argc)), priority (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'priority' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (S) // expected-error {{'S' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority(0)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority(-1) // expected-error {{argument to 'priority' clause must be a non-negative integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  int z;
+  #pragma omp masked taskloop priority // expected-error {{expected '(' after 'priority'}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority () // expected-error {{expected expression}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc)) // expected-warning {{extra tokens at the end of '#pragma omp masked taskloop' are ignored}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc > 0 ? argv[1][0] : argv[2][argc] - z)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (foobool(argc)), priority (true) // expected-error {{directive '#pragma omp masked taskloop' cannot contain more than one 'priority' clause}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (S1) // expected-error {{'S1' does not refer to a value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority (1 0) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority(if(tmain(argc, argv) // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority(0)
+  for (int i = 0; i < 10; ++i)
+    foo();
+  #pragma omp masked taskloop priority(-1) // expected-error {{argument to 'priority' clause must be a non-negative integer value}}
+  for (int i = 0; i < 10; ++i)
+    foo();
+
+  return tmain(argc, argv);
+}
diff --git a/clang/test/OpenMP/masked_taskloop_private_messages.cpp b/clang/test/OpenMP/masked_taskloop_private_messages.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/masked_taskloop_private_messages.cpp
@@ -0,0 +1,260 @@
+// RUN: %clang_cc1 -verify -fopenmp %s -Wuninitialized
+
+// RUN: %clang_cc1 -verify -fopenmp-simd %s -Wuninitialized
+
+typedef void **omp_allocator_handle_t;
+extern const omp_allocator_handle_t omp_null_allocator;
+extern const omp_allocator_handle_t omp_default_mem_alloc;
+extern const omp_allocator_handle_t omp_large_cap_mem_alloc;
+extern const omp_allocator_handle_t omp_const_mem_alloc;
+extern const omp_allocator_handle_t omp_high_bw_mem_alloc;
+extern const omp_allocator_handle_t omp_low_lat_mem_alloc;
+extern const omp_allocator_handle_t omp_cgroup_mem_alloc;
+extern const omp_allocator_handle_t omp_pteam_mem_alloc;
+extern const omp_allocator_handle_t omp_thread_mem_alloc;
+
+void foo() {
+}
+
+bool foobool(int argc) {
+  return argc;
+}
+
+struct S1; // expected-note 2 {{declared here}} expected-note 2 {{forward declaration of 'S1'}}
+extern S1 a;
+class S2 {
+  mutable int a;
+
+public:
+  S2() : a(0) {}
+};
+const S2 b;
+const S2 ba[5];
+class S3 {
+  int a;
+
+public:
+  S3() : a(0) {}
+};
+const S3 ca[5];
+class S4 {
+  int a;
+  S4(); // expected-note {{implicitly declared private here}}
+
+public:
+  S4(int v) : a(v) {
+#pragma omp masked taskloop private(a) private(this->a)
+    for (int k = 0; k < v; ++k)
+      ++this->a;
+  }
+};
+class S5 {
+  int a;
+  S5() : a(0) {} // expected-note {{implicitly declared private here}}
+
+public:
+  S5(int v) : a(v) {}
+  S5 &operator=(S5 &s) {
+#pragma omp masked taskloop private(a) private(this->a) private(s.a) // expected-error {{expected variable name or data member of current class}}
+    for (int k = 0; k < s.a; ++k)
+      ++s.a;
+    return *this;
+  }
+};
+
+template <typename T>
+class S6 {
+public:
+  T a;
+
+  S6() : a(0) {}
+  S6(T v) : a(v) {
+#pragma omp masked taskloop private(a) private(this->a) allocate(omp_thread_mem_alloc: a) // expected-warning {{allocator with the 'thread' trait access has unspecified behavior on 'masked taskloop' directive}}
+    for (int k = 0; k < v; ++k)
+      ++this->a;
+  }
+  S6 &operator=(S6 &s) {
+#pragma omp masked taskloop private(a) private(this->a) private(s.a) // expected-error {{expected variable name or data member of current class}}
+    for (int k = 0; k < s.a; ++k)
+      ++s.a;
+    return *this;
+  }
+};
+
+template <typename T>
+class S7 : public T {
+  T a;
+  S7() : a(0) {}
+
+public:
+  S7(T v) : a(v) {
+#pragma omp masked taskloop private(a) private(this->a) private(T::a)
+    for (int k = 0; k < a.a; ++k)
+      ++this->a.a;
+  }
+  S7 &operator=(S7 &s) {
+#pragma omp masked taskloop private(a) private(this->a) private(s.a) private(s.T::a) // expected-error 2 {{expected variable name or data member of current class}}
+    for (int k = 0; k < s.a.a; ++k)
+      ++s.a.a;
+    return *this;
+  }
+};
+
+S3 h;
+#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
+
+template <class I, class C>
+int foomain(I argc, C **argv) {
+  I e(4);
+  I g(5);
+  int i, z;
+  int &j = i;
+#pragma omp masked taskloop private // expected-error {{expected '(' after 'private'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private() // expected-error {{expected expression}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc) allocate , allocate(, allocate(omp_default , allocate(omp_default_mem_alloc, allocate(omp_default_mem_alloc:, allocate(omp_default_mem_alloc: argc, allocate(omp_default_mem_alloc: argv), allocate(argv) // expected-error {{expected '(' after 'allocate'}} expected-error 2 {{expected expression}} expected-error 2 {{expected ')'}} expected-error {{use of undeclared identifier 'omp_default'}} expected-note 2 {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(S1) // expected-error {{'S1' does not refer to a value}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(a, b) // expected-error {{private variable with incomplete type 'S1'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argv[1]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(e, g, z)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(h) // expected-error {{threadprivate or thread local variable cannot be private}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop shared(i)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+  {
+    int v = 0;
+    int i;
+#pragma omp masked taskloop private(i)
+    for (int k = 0; k < argc; ++k) {
+      i = k;
+      v += i;
+    }
+  }
+#pragma omp parallel shared(i)
+#pragma omp parallel private(i)
+#pragma omp masked taskloop private(j)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(i)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+  return 0;
+}
+
+void bar(S4 a[2]) {
+#pragma omp parallel
+#pragma omp masked taskloop private(a)
+  for (int i = 0; i < 2; ++i)
+    foo();
+}
+
+namespace A {
+double x;
+#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
+}
+namespace B {
+using A::x;
+}
+
+int main(int argc, char **argv) {
+  S4 e(4);
+  S5 g(5);
+  S6<float> s6(0.0) , s6_0(1.0); // expected-note {{in instantiation of member function 'S6<float>::S6' requested here}}
+  S7<S6<float> > s7(0.0) , s7_0(1.0);
+  int i, z;
+  int &j = i;
+#pragma omp masked taskloop private // expected-error {{expected '(' after 'private'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private() // expected-error {{expected expression}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argc)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(S1) // expected-error {{'S1' does not refer to a value}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(a, b) // expected-error {{private variable with incomplete type 'S1'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(argv[1]) // expected-error {{expected variable name}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(h) // expected-error {{threadprivate or thread local variable cannot be private}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(B::x) // expected-error {{threadprivate or thread local variable cannot be private}}
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop shared(i)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp parallel
+  {
+    int i;
+#pragma omp masked taskloop private(i)
+    for (int k = 0; k < argc; ++k)
+      ++k;
+  }
+#pragma omp parallel shared(i)
+#pragma omp parallel private(i)
+#pragma omp masked taskloop private(j)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+#pragma omp masked taskloop private(i, z)
+  for (int k = 0; k < argc; ++k)
+    ++k;
+  static int si;
+#pragma omp masked taskloop private(si) // OK
+  for(int k = 0; k < argc; ++k)
+    si = k + 1;
+
+  s6 = s6_0; // expected-note {{in instantiation of member function 'S6<float>::operator=' requested here}}
+  s7 = s7_0; // expected-note {{in instantiation of member function 'S7<S6<float>>::operator=' requested here}}
+  return foomain(argc, argv); // expected-note {{in instantiation of function template specialization 'foomain<int, char>' requested here}}
+}
+
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2178,6 +2178,7 @@
   void VisitOMPTaskLoopDirective(const OMPTaskLoopDirective *D);
   void VisitOMPTaskLoopSimdDirective(const OMPTaskLoopSimdDirective *D);
   void VisitOMPMasterTaskLoopDirective(const OMPMasterTaskLoopDirective *D);
+  void VisitOMPMaskedTaskLoopDirective(const OMPMaskedTaskLoopDirective *D);
   void
   VisitOMPMasterTaskLoopSimdDirective(const OMPMasterTaskLoopSimdDirective *D);
   void VisitOMPParallelMasterTaskLoopDirective(
@@ -3184,6 +3185,11 @@
   VisitOMPLoopDirective(D);
 }
 
+void EnqueueVisitor::VisitOMPMaskedTaskLoopDirective(
+    const OMPMaskedTaskLoopDirective *D) {
+  VisitOMPLoopDirective(D);
+}
+
 void EnqueueVisitor::VisitOMPMasterTaskLoopSimdDirective(
     const OMPMasterTaskLoopSimdDirective *D) {
   VisitOMPLoopDirective(D);
@@ -5822,6 +5828,8 @@
     return cxstring::createRef("OMPTaskLoopSimdDirective");
   case CXCursor_OMPMasterTaskLoopDirective:
     return cxstring::createRef("OMPMasterTaskLoopDirective");
+  case CXCursor_OMPMaskedTaskLoopDirective:
+    return cxstring::createRef("OMPMaskedTaskLoopDirective");
   case CXCursor_OMPMasterTaskLoopSimdDirective:
     return cxstring::createRef("OMPMasterTaskLoopSimdDirective");
   case CXCursor_OMPParallelMasterTaskLoopDirective:
diff --git a/clang/tools/libclang/CXCursor.cpp b/clang/tools/libclang/CXCursor.cpp
--- a/clang/tools/libclang/CXCursor.cpp
+++ b/clang/tools/libclang/CXCursor.cpp
@@ -769,6 +769,9 @@
   case Stmt::OMPMasterTaskLoopDirectiveClass:
     K = CXCursor_OMPMasterTaskLoopDirective;
     break;
+  case Stmt::OMPMaskedTaskLoopDirectiveClass:
+    K = CXCursor_OMPMaskedTaskLoopDirective;
+    break;
   case Stmt::OMPMasterTaskLoopSimdDirectiveClass:
     K = CXCursor_OMPMasterTaskLoopSimdDirective;
     break;
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMP.td b/llvm/include/llvm/Frontend/OpenMP/OMP.td
--- a/llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ b/llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -1643,6 +1643,28 @@
     VersionedClause<OMPC_Allocate>
   ];
 }
+def OMP_MaskedTaskloop : Directive<"masked taskloop"> {
+  let allowedClauses = [
+    VersionedClause<OMPC_If>,
+    VersionedClause<OMPC_Shared>,
+    VersionedClause<OMPC_Private>,
+    VersionedClause<OMPC_FirstPrivate>,
+    VersionedClause<OMPC_LastPrivate>,
+    VersionedClause<OMPC_Default>,
+    VersionedClause<OMPC_Collapse>,
+    VersionedClause<OMPC_Final>,
+    VersionedClause<OMPC_Untied>,
+    VersionedClause<OMPC_Mergeable>,
+    VersionedClause<OMPC_Priority>,
+    VersionedClause<OMPC_GrainSize>,
+    VersionedClause<OMPC_NoGroup>,
+    VersionedClause<OMPC_NumTasks>,
+    VersionedClause<OMPC_Reduction>,
+    VersionedClause<OMPC_InReduction>,
+    VersionedClause<OMPC_Allocate>,
+    VersionedClause<OMPC_Filter>
+  ];
+}
 def OMP_ParallelMasterTaskloop :
     Directive<"parallel master taskloop"> {
   let allowedClauses = [