https://github.com/kevinsala created 
https://github.com/llvm/llvm-project/pull/206412

Add parsing for `dims` modifier (OpenMP 6.1) in `num_teams` and `thread_limit` 
clauses. Examples:

```cpp
constexpr int N = 2;
#pragma omp teams num_teams(dims(3): x, y, z) thread_limit(dims(N): a, b)
{ ... }
```

>From f892160c52b0c1d73582ca47c505f29e84e02c82 Mon Sep 17 00:00:00 2001
From: Kevin Sala <[email protected]>
Date: Sun, 28 Jun 2026 18:43:24 -0700
Subject: [PATCH 1/2] [Clang][OpenMP] Remove unnecessary LParentLoc in
 ThreadLimit and NumTeams clauses

The LParentLoc is already a field of the OMPVarListClause class. The ThreadLimit
and NumTeams clause classes should not need to define it.
---
 clang/include/clang/AST/OpenMPClause.h | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/clang/include/clang/AST/OpenMPClause.h 
b/clang/include/clang/AST/OpenMPClause.h
index bae396d883dc8..12959fe0c2ff0 100644
--- a/clang/include/clang/AST/OpenMPClause.h
+++ b/clang/include/clang/AST/OpenMPClause.h
@@ -6995,9 +6995,6 @@ class OMPNumTeamsClause final
   friend OMPVarListClause;
   friend TrailingObjects;
 
-  /// Location of '('.
-  SourceLocation LParenLoc;
-
   /// Modifier that was specified.
   OpenMPNumTeamsClauseModifier Modifier = OMPC_NUMTEAMS_unknown;
 
@@ -7041,12 +7038,6 @@ class OMPNumTeamsClause final
   /// \param N The number of variables.
   static OMPNumTeamsClause *CreateEmpty(const ASTContext &C, unsigned N);
 
-  /// Sets the location of '('.
-  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }
-
-  /// Returns the location of '('.
-  SourceLocation getLParenLoc() const { return LParenLoc; }
-
   /// Return NumTeams expressions.
   ArrayRef<Expr *> getNumTeams() { return getVarRefs(); }
 
@@ -7119,9 +7110,6 @@ class OMPThreadLimitClause final
   friend OMPVarListClause;
   friend TrailingObjects;
 
-  /// Location of '('.
-  SourceLocation LParenLoc;
-
   OMPThreadLimitClause(const ASTContext &C, SourceLocation StartLoc,
                        SourceLocation LParenLoc, SourceLocation EndLoc,
                        unsigned N)
@@ -7155,12 +7143,6 @@ class OMPThreadLimitClause final
   /// \param N The number of variables.
   static OMPThreadLimitClause *CreateEmpty(const ASTContext &C, unsigned N);
 
-  /// Sets the location of '('.
-  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }
-
-  /// Returns the location of '('.
-  SourceLocation getLParenLoc() const { return LParenLoc; }
-
   /// Return ThreadLimit expressions.
   ArrayRef<Expr *> getThreadLimit() { return getVarRefs(); }
 

>From 856abc76adb9934282906515b28e54867a51b017 Mon Sep 17 00:00:00 2001
From: Kevin Sala <[email protected]>
Date: Sun, 28 Jun 2026 14:14:36 -0700
Subject: [PATCH 2/2] [Clang][OpenMP] Add parsing for dims modifier in
 num_teams and thread_limit

---
 clang/include/clang/AST/OpenMPClause.h        |  64 ++++-
 .../clang/Basic/DiagnosticSemaKinds.td        |  15 +-
 clang/include/clang/Basic/OpenMPKinds.def     |   8 +
 clang/include/clang/Basic/OpenMPKinds.h       |   6 +
 clang/include/clang/Sema/SemaOpenMP.h         |  32 ++-
 clang/lib/AST/OpenMPClause.cpp                |  29 ++-
 clang/lib/AST/StmtProfile.cpp                 |   3 +
 clang/lib/Basic/OpenMPKinds.cpp               |  21 +-
 clang/lib/Parse/ParseOpenMP.cpp               |  84 +++++--
 clang/lib/Sema/SemaOpenMP.cpp                 | 231 ++++++++++++------
 clang/lib/Sema/TreeTransform.h                |  34 ++-
 clang/lib/Serialization/ASTReader.cpp         |   3 +
 clang/lib/Serialization/ASTWriter.cpp         |   3 +
 clang/test/OpenMP/dims_modifier_ast_print.cpp |  40 +++
 clang/test/OpenMP/dims_modifier_messages.cpp  | 124 ++++++++++
 clang/test/OpenMP/ompx_bare_messages.c        |   2 +-
 ...et_teams_distribute_num_teams_messages.cpp |  16 +-
 ...ribute_parallel_for_num_teams_messages.cpp |   8 +-
 .../test/OpenMP/teams_num_teams_messages.cpp  |  20 +-
 clang/tools/libclang/CIndex.cpp               |   2 +
 20 files changed, 596 insertions(+), 149 deletions(-)
 create mode 100644 clang/test/OpenMP/dims_modifier_ast_print.cpp
 create mode 100644 clang/test/OpenMP/dims_modifier_messages.cpp

diff --git a/clang/include/clang/AST/OpenMPClause.h 
b/clang/include/clang/AST/OpenMPClause.h
index 12959fe0c2ff0..bd58a41d4df1e 100644
--- a/clang/include/clang/AST/OpenMPClause.h
+++ b/clang/include/clang/AST/OpenMPClause.h
@@ -6982,6 +6982,13 @@ class OMPMapClause final : public 
OMPMappableExprListClause<OMPMapClause>,
 /// single expression 'n' as upper-bound and modifier expression 'm' as
 /// lower-bound.
 ///
+/// \code
+/// #pragma omp teams num_teams(dims(2): x, y)
+/// \endcode
+/// In this example directive '#pragma omp teams' has clause 'num_teams' with
+/// the 'dims' modifier specifying two dimensions. The list specifies the 
number
+/// of teams in each dimension.
+///
 /// When 'ompx_bare' clause exists on a 'target' directive, 'num_teams' clause
 /// can accept up to three expressions.
 ///
@@ -7061,6 +7068,13 @@ class OMPNumTeamsClause final
   /// Set the expression of the modifier.
   void setModifierExpr(Expr *E) { *varlist_end() = E; }
 
+  /// Get the expression of the modifier if it is the dims modifier.
+  const Expr *getDimsModifierExpr() const {
+    if (Modifier == OMPC_NUMTEAMS_dims)
+      return getModifierExpr();
+    return nullptr;
+  }
+
   /// Get the location of the modifier.
   SourceLocation getModifierLoc() const { return ModifierLoc; }
 
@@ -7097,6 +7111,13 @@ class OMPNumTeamsClause final
 /// In this example directive '#pragma omp teams' has clause 'thread_limit'
 /// with single expression 'n'.
 ///
+/// \code
+/// #pragma omp teams thread_limit(dims(2): x, y)
+/// \endcode
+/// In this example directive '#pragma omp teams' has clause 'thread_limit' 
with
+/// the 'dims' modifier specifying two dimensions. The list specifies the limit
+/// on the number of threads in each dimension.
+///
 /// When 'ompx_bare' clause exists on a 'target' directive, 'thread_limit'
 /// clause can accept up to three expressions.
 ///
@@ -7110,6 +7131,12 @@ class OMPThreadLimitClause final
   friend OMPVarListClause;
   friend TrailingObjects;
 
+  /// Modifier that was specified.
+  OpenMPThreadLimitClauseModifier Modifier = OMPC_THREADLIMIT_unknown;
+
+  /// Location of the modifier.
+  SourceLocation ModifierLoc;
+
   OMPThreadLimitClause(const ASTContext &C, SourceLocation StartLoc,
                        SourceLocation LParenLoc, SourceLocation EndLoc,
                        unsigned N)
@@ -7131,11 +7158,16 @@ class OMPThreadLimitClause final
   /// \param LParenLoc Location of '('.
   /// \param EndLoc Ending location of the clause.
   /// \param VL List of references to the variables.
+  /// \param Modifier The modifier specified in the clause.
+  /// \param ModifierExpr The expression of the modifier.
+  /// \param ModifierLoc Location of the modifier.
   /// \param PreInit
   static OMPThreadLimitClause *
   Create(const ASTContext &C, OpenMPDirectiveKind CaptureRegion,
          SourceLocation StartLoc, SourceLocation LParenLoc,
-         SourceLocation EndLoc, ArrayRef<Expr *> VL, Stmt *PreInit);
+         SourceLocation EndLoc, ArrayRef<Expr *> VL,
+         OpenMPThreadLimitClauseModifier Modifier, Expr *ModifierExpr,
+         SourceLocation ModifierLoc, Stmt *PreInit);
 
   /// Creates an empty clause with \a N variables.
   ///
@@ -7151,9 +7183,37 @@ class OMPThreadLimitClause final
     return const_cast<OMPThreadLimitClause *>(this)->getThreadLimit();
   }
 
+  /// Get the modifier.
+  OpenMPThreadLimitClauseModifier getModifier() const { return Modifier; }
+
+  /// Set the modifier.
+  void setModifier(OpenMPThreadLimitClauseModifier M) { Modifier = M; }
+
+  /// Get the expression of the modifier.
+  const Expr *getModifierExpr() const { return *varlist_end(); }
+
+  /// Get the expression of the modifier.
+  Expr *getModifierExpr() { return *varlist_end(); }
+
+  /// Set the expression of the modifier.
+  void setModifierExpr(Expr *E) { *varlist_end() = E; }
+
+  /// Get the expression of the modifier if it is the dims modifier.
+  const Expr *getDimsModifierExpr() const {
+    if (Modifier == OMPC_THREADLIMIT_dims)
+      return getModifierExpr();
+    return nullptr;
+  }
+
+  /// Get the location of the modifier.
+  SourceLocation getModifierLoc() const { return ModifierLoc; }
+
+  /// Set the location of the modifier.
+  void setModifierLoc(SourceLocation Loc) { ModifierLoc = Loc; }
+
   child_range children() {
     return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
-                       reinterpret_cast<Stmt **>(varlist_end()));
+                       reinterpret_cast<Stmt **>(varlist_end()) + 1);
   }
 
   const_child_range children() const {
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td 
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 6b2d78881d4e2..15f97e5e2abc6 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -12779,9 +12779,11 @@ def warn_omp_unterminated_declare_target : Warning<
   "expected '#pragma omp end declare target' at end of file to match '#pragma 
omp %0'">,
   InGroup<SourceUsesOpenMP>;
 def err_ompx_bare_no_grid : Error<
-  "'ompx_bare' clauses requires explicit grid size via 'num_teams' and 
'thread_limit' clauses">;
-def err_omp_multi_expr_not_allowed: Error<"only one expression allowed in '%0' 
clause">;
-def err_ompx_more_than_three_expr_not_allowed: Error<"at most three 
expressions are allowed in '%0' clause in 'target teams ompx_bare' construct">;
+  "'ompx_bare' clause requires explicit grid size via 'num_teams' and 
'thread_limit' clauses">;
+def err_ompx_bare_no_dims : Error<
+  "'ompx_bare' clause cannot be specified with 'dims' modifier in 'num_teams' 
and 'thread_limit' clauses">;
+def err_omp_multi_expr_not_allowed : Error<"only one expression allowed in 
'%0' clause">;
+def err_omp_max_three_exprs: Error<"maximum three expressions are supported in 
'%0' clause">;
 def err_omp_transparent_invalid_value : Error<"invalid value for transparent 
clause,"
   " expected one of: omp_not_impex, omp_import, omp_export, omp_impex">;
 def err_omp_transparent_invalid_type : Error<
@@ -12790,6 +12792,12 @@ def err_omp_num_teams_lower_bound_larger
     : Error<"lower bound is greater than upper bound in 'num_teams' clause">;
 def err_omp_modifier_requires_version : Error<
   "'%0' modifier in '%1' clause requires OpenMP %2 or later">;
+def err_omp_unexpected_num_exprs
+    : Error<"unexpected number of expressions in '%0' clause">;
+def err_omp_max_supported_dims
+    : Error<"at most three dimensions are supported in '%0' clause">;
+def err_omp_incompatible_modifiers
+    : Error<"'%0' modifier cannot be specified with '%1' modifier in '%2' 
clause">;
 } // end of OpenMP category
 
 let CategoryName = "Related Result Type Issue" in {
@@ -12816,7 +12824,6 @@ def note_related_result_type_explicit : Note<
   "%select{| and is expected to return an instance of its class type}0">;
 def err_invalid_type_for_program_scope_var : Error<
   "the %0 type cannot be used to declare a program scope variable">;
-
 }
 
 let CategoryName = "Modules Issue" in {
diff --git a/clang/include/clang/Basic/OpenMPKinds.def 
b/clang/include/clang/Basic/OpenMPKinds.def
index 079ff4a583f9f..5c396a5d2d4b3 100644
--- a/clang/include/clang/Basic/OpenMPKinds.def
+++ b/clang/include/clang/Basic/OpenMPKinds.def
@@ -101,6 +101,9 @@
 #ifndef OPENMP_NUMTHREADS_MODIFIER
 #define OPENMP_NUMTHREADS_MODIFIER(Name)
 #endif
+#ifndef OPENMP_THREADLIMIT_MODIFIER
+#define OPENMP_THREADLIMIT_MODIFIER(Name)
+#endif
 #ifndef OPENMP_DOACROSS_MODIFIER
 #define OPENMP_DOACROSS_MODIFIER(Name)
 #endif
@@ -273,10 +276,14 @@ OPENMP_NUMTASKS_MODIFIER(strict)
 
 // Modifiers for the 'num_teams' clause.
 OPENMP_NUMTEAMS_MODIFIER(lower_bound)
+OPENMP_NUMTEAMS_MODIFIER(dims)
 
 // Modifiers for the 'num_tasks' clause.
 OPENMP_NUMTHREADS_MODIFIER(strict)
 
+// Modifiers for the 'thread_limit' clause.
+OPENMP_THREADLIMIT_MODIFIER(dims)
+
 // Modifiers for 'allocate' clause.
 OPENMP_ALLOCATE_MODIFIER(allocator)
 OPENMP_ALLOCATE_MODIFIER(align)
@@ -301,6 +308,7 @@ OPENMP_USE_DEVICE_PTR_FALLBACK_MODIFIER(fb_preserve)
 #undef OPENMP_NUMTASKS_MODIFIER
 #undef OPENMP_NUMTEAMS_MODIFIER
 #undef OPENMP_NUMTHREADS_MODIFIER
+#undef OPENMP_THREADLIMIT_MODIFIER
 #undef OPENMP_DYN_GROUPPRIVATE_MODIFIER
 #undef OPENMP_DYN_GROUPPRIVATE_FALLBACK_MODIFIER
 #undef OPENMP_GRAINSIZE_MODIFIER
diff --git a/clang/include/clang/Basic/OpenMPKinds.h 
b/clang/include/clang/Basic/OpenMPKinds.h
index 3ee6cb83a431e..36c388668a455 100644
--- a/clang/include/clang/Basic/OpenMPKinds.h
+++ b/clang/include/clang/Basic/OpenMPKinds.h
@@ -274,6 +274,12 @@ enum OpenMPNumThreadsClauseModifier {
   OMPC_NUMTHREADS_unknown
 };
 
+enum OpenMPThreadLimitClauseModifier {
+#define OPENMP_THREADLIMIT_MODIFIER(Name) OMPC_THREADLIMIT_##Name,
+#include "clang/Basic/OpenMPKinds.def"
+  OMPC_THREADLIMIT_unknown
+};
+
 /// OpenMP dependence types for 'doacross' clause.
 enum OpenMPDoacrossClauseModifier {
 #define OPENMP_DOACROSS_MODIFIER(Name) OMPC_DOACROSS_##Name,
diff --git a/clang/include/clang/Sema/SemaOpenMP.h 
b/clang/include/clang/Sema/SemaOpenMP.h
index f689e227866a7..726ac8539c66b 100644
--- a/clang/include/clang/Sema/SemaOpenMP.h
+++ b/clang/include/clang/Sema/SemaOpenMP.h
@@ -1188,10 +1188,15 @@ class SemaOpenMP : public SemaBase {
     SourceLocation RLoc;
     CXXScopeSpec ReductionOrMapperIdScopeSpec;
     DeclarationNameInfo ReductionOrMapperId;
-    int ExtraModifier =
-        -1; ///< Additional modifier for linear, map, depend,
-            ///< lastprivate, use_device_ptr, or num_teams clause.
-    Expr *ExtraModifierExpr = nullptr;
+    SmallVector<int, 2> ExtraModifierArray = {-1, -1};
+    SmallVector<Expr *, 2> ExtraModifierExprArray = {nullptr, nullptr};
+    SmallVector<SourceLocation, 2> ExtraModifierLocArray = {SourceLocation(),
+                                                            SourceLocation()};
+    /// Additional modifier for linear, map, depend, lastprivate,
+    /// use_device_ptr, or num_teams clause.
+    int &ExtraModifier = ExtraModifierArray[0];
+    Expr *&ExtraModifierExpr = ExtraModifierExprArray[0];
+    SourceLocation &ExtraModifierLoc = ExtraModifierLocArray[0];
     int OriginalSharingModifier = 0; // Default is shared
     int NeedDevicePtrModifier = 0;
     SourceLocation NeedDevicePtrModifierLoc;
@@ -1203,7 +1208,6 @@ class SemaOpenMP : public SemaBase {
         MotionModifiers;
     SmallVector<SourceLocation, NumberOfOMPMotionModifiers> MotionModifiersLoc;
     bool IsMapTypeImplicit = false;
-    SourceLocation ExtraModifierLoc;
     SourceLocation OriginalSharingModifierLoc;
     SourceLocation OmpAllMemoryLoc;
     SourceLocation
@@ -1345,13 +1349,15 @@ class SemaOpenMP : public SemaBase {
   /// Called on well-formed 'num_teams' clause.
   OMPClause *ActOnOpenMPNumTeamsClause(
       ArrayRef<Expr *> VarList, OpenMPNumTeamsClauseModifier Modifier,
-      Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+      Expr *ModifierExpr, SourceLocation ModifierLoc,
+      OpenMPNumTeamsClauseModifier ModifierExtra, Expr *ModifierExtraExpr,
+      SourceLocation ModifierExtraLoc, SourceLocation StartLoc,
       SourceLocation LParenLoc, SourceLocation EndLoc);
   /// Called on well-formed 'thread_limit' clause.
-  OMPClause *ActOnOpenMPThreadLimitClause(ArrayRef<Expr *> VarList,
-                                          SourceLocation StartLoc,
-                                          SourceLocation LParenLoc,
-                                          SourceLocation EndLoc);
+  OMPClause *ActOnOpenMPThreadLimitClause(
+      ArrayRef<Expr *> VarList, OpenMPThreadLimitClauseModifier Modifier,
+      Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+      SourceLocation LParenLoc, SourceLocation EndLoc);
   /// Called on well-formed 'priority' clause.
   OMPClause *ActOnOpenMPPriorityClause(Expr *Priority, SourceLocation StartLoc,
                                        SourceLocation LParenLoc,
@@ -1484,6 +1490,12 @@ class SemaOpenMP : public SemaBase {
                                   SourceLocation LLoc, SourceLocation RLoc,
                                   ArrayRef<OMPIteratorData> Data);
 
+  ExprResult ActOnOpenMPDimsModifier(OpenMPClauseKind Kind, int Modifier,
+                                     Expr *ModifierExpr,
+                                     SourceLocation ModifierLoc,
+                                     ArrayRef<Expr *> VarList,
+                                     SourceLocation VarListEndLoc);
+
   void handleOMPAssumeAttr(Decl *D, const ParsedAttr &AL);
 
   /// Setter and getter functions for device_num.
diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index f3e548e898b39..d451255bf5845 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -1978,18 +1978,24 @@ OMPNumTeamsClause *OMPNumTeamsClause::CreateEmpty(const 
ASTContext &C,
 OMPThreadLimitClause *OMPThreadLimitClause::Create(
     const ASTContext &C, OpenMPDirectiveKind CaptureRegion,
     SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation EndLoc,
-    ArrayRef<Expr *> VL, Stmt *PreInit) {
-  void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(VL.size()));
+    ArrayRef<Expr *> VL, OpenMPThreadLimitClauseModifier Modifier,
+    Expr *ModifierExpr, SourceLocation ModifierLoc, Stmt *PreInit) {
+  // Reserve space for an extra modifier expression.
+  void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(VL.size() + 1));
   OMPThreadLimitClause *Clause =
       new (Mem) OMPThreadLimitClause(C, StartLoc, LParenLoc, EndLoc, 
VL.size());
   Clause->setVarRefs(VL);
+  Clause->setModifier(Modifier);
+  Clause->setModifierExpr(ModifierExpr);
+  Clause->setModifierLoc(ModifierLoc);
   Clause->setPreInitStmt(PreInit, CaptureRegion);
   return Clause;
 }
 
 OMPThreadLimitClause *OMPThreadLimitClause::CreateEmpty(const ASTContext &C,
                                                         unsigned N) {
-  void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(N));
+  // Reserve space for an extra modifier expression.
+  void *Mem = C.Allocate(totalSizeToAlloc<Expr *>(N + 1));
   return new (Mem) OMPThreadLimitClause(N);
 }
 
@@ -2373,9 +2379,13 @@ void 
OMPClausePrinter::VisitOMPDeviceClause(OMPDeviceClause *Node) {
 void OMPClausePrinter::VisitOMPNumTeamsClause(OMPNumTeamsClause *Node) {
   if (!Node->varlist_empty()) {
     OS << "num_teams";
-    if (const Expr *LowerBound = Node->getModifierExpr()) {
+    if (Node->getModifier() != OMPC_NUMTEAMS_unknown) {
       OS << "(";
-      LowerBound->printPretty(OS, nullptr, Policy, 0);
+      if (Node->getModifier() == OMPC_NUMTEAMS_dims)
+        OS << "dims(";
+      Node->getModifierExpr()->printPretty(OS, nullptr, Policy, 0);
+      if (Node->getModifier() == OMPC_NUMTEAMS_dims)
+        OS << ")";
       VisitOMPClauseList(Node, ':');
     } else {
       VisitOMPClauseList(Node, '(');
@@ -2387,7 +2397,14 @@ void 
OMPClausePrinter::VisitOMPNumTeamsClause(OMPNumTeamsClause *Node) {
 void OMPClausePrinter::VisitOMPThreadLimitClause(OMPThreadLimitClause *Node) {
   if (!Node->varlist_empty()) {
     OS << "thread_limit";
-    VisitOMPClauseList(Node, '(');
+    if (Node->getModifier() == OMPC_THREADLIMIT_dims) {
+      OS << "(dims(";
+      Node->getModifierExpr()->printPretty(OS, nullptr, Policy, 0);
+      OS << ")";
+      VisitOMPClauseList(Node, ':');
+    } else {
+      VisitOMPClauseList(Node, '(');
+    }
     OS << ")";
   }
 }
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index a7e7006c98a1b..291c72385518e 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -920,6 +920,9 @@ void OMPClauseProfiler::VisitOMPNumTeamsClause(const 
OMPNumTeamsClause *C) {
 }
 void OMPClauseProfiler::VisitOMPThreadLimitClause(
     const OMPThreadLimitClause *C) {
+  Profiler->VisitInteger(C->getModifier());
+  if (const Expr *Modifier = C->getModifierExpr())
+    Profiler->VisitStmt(Modifier);
   VisitOMPClauseList(C);
   VisitOMPClauseWithPreInit(C);
 }
diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index c590113578081..890ed0d29a7c6 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -224,6 +224,15 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind 
Kind, StringRef Str,
       return OMPC_NUMTEAMS_unknown;
     return Type;
   }
+  case OMPC_thread_limit: {
+    unsigned Type = llvm::StringSwitch<unsigned>(Str)
+#define OPENMP_THREADLIMIT_MODIFIER(Name) .Case(#Name, OMPC_THREADLIMIT_##Name)
+#include "clang/Basic/OpenMPKinds.def"
+                        .Default(OMPC_THREADLIMIT_unknown);
+    if (LangOpts.OpenMP < 61)
+      return OMPC_THREADLIMIT_unknown;
+    return Type;
+  }
   case OMPC_allocate:
     return llvm::StringSwitch<OpenMPAllocateClauseModifier>(Str)
 #define OPENMP_ALLOCATE_MODIFIER(Name) .Case(#Name, OMPC_ALLOCATE_##Name)
@@ -294,7 +303,6 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind 
Kind, StringRef Str,
   case OMPC_relaxed:
   case OMPC_threads:
   case OMPC_simd:
-  case OMPC_thread_limit:
   case OMPC_priority:
   case OMPC_nogroup:
   case OMPC_hint:
@@ -606,6 +614,16 @@ const char 
*clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
 #include "clang/Basic/OpenMPKinds.def"
     }
     llvm_unreachable("Invalid OpenMP 'num_teams' clause modifier");
+  case OMPC_thread_limit:
+    switch (Type) {
+    case OMPC_THREADLIMIT_unknown:
+      return "unknown";
+#define OPENMP_THREADLIMIT_MODIFIER(Name)                                      
\
+  case OMPC_THREADLIMIT_##Name:                                                
\
+    return #Name;
+#include "clang/Basic/OpenMPKinds.def"
+    }
+    llvm_unreachable("Invalid OpenMP 'thread_limit' clause modifier");
   case OMPC_allocate:
     switch (Type) {
     case OMPC_ALLOCATE_unknown:
@@ -683,7 +701,6 @@ const char 
*clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
   case OMPC_relaxed:
   case OMPC_threads:
   case OMPC_simd:
-  case OMPC_thread_limit:
   case OMPC_priority:
   case OMPC_nogroup:
   case OMPC_hint:
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 62715da7966d0..2206d153badfd 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -5289,29 +5289,71 @@ bool Parser::ParseOpenMPVarList(OpenMPDirectiveKind 
DKind,
           Diag(Tok, diag::err_modifier_expected_colon) << "fallback";
       }
     }
-  } else if (Kind == OMPC_num_teams) {
-    // Handle optional lower-bound modifier for num_teams clause.
-    Data.ExtraModifier = OMPC_NUMTEAMS_unknown;
-    TentativeParsingAction TPA(*this);
-    SourceLocation TLoc = Tok.getLocation();
-    ExprResult FirstExpr = ParseAssignmentExpression();
-    if (FirstExpr.isInvalid()) {
-      SkipUntil(tok::r_paren, tok::annot_pragma_openmp_end, StopBeforeMatch);
-      Data.RLoc = Tok.getLocation();
-      if (!T.consumeClose())
-        Data.RLoc = T.getCloseLocation();
-      TPA.Commit();
-      return true;
+  } else if (Kind == OMPC_num_teams || Kind == OMPC_thread_limit) {
+    int Mod = 0;
+    // Handle optional dims and lower-bound modifiers for num_teams clause, and
+    // the optional dims modifier for thread_limit clause.
+    Data.ExtraModifierArray[0] = Data.ExtraModifierArray[1] =
+        Kind == OMPC_num_teams ? static_cast<int>(OMPC_NUMTEAMS_unknown)
+                               : static_cast<int>(OMPC_THREADLIMIT_unknown);
+
+    // Lower-bound modifier is only accepted in num_teams.
+    bool CanParseLowerBoundModifier = (Kind == OMPC_num_teams);
+    if (!Tok.isAnnotation() && PP.getSpelling(Tok) == "dims" &&
+        NextToken().is(tok::l_paren)) {
+      SourceLocation TLoc = Tok.getLocation();
+      ConsumeToken();
+      SourceLocation RLoc;
+      ExprResult ExprR = ParseOpenMPParensExpr(getOpenMPClauseName(Kind), 
RLoc);
+      if (ExprR.isUsable()) {
+        Data.ExtraModifierArray[Mod] =
+            Kind == OMPC_num_teams ? static_cast<int>(OMPC_NUMTEAMS_dims)
+                                   : static_cast<int>(OMPC_THREADLIMIT_dims);
+        Data.ExtraModifierExprArray[Mod] = ExprR.get();
+        Data.ExtraModifierLocArray[Mod] = TLoc;
+        ++Mod;
+      }
+
+      CanParseLowerBoundModifier &= Tok.is(tok::comma);
+      if (CanParseLowerBoundModifier || Tok.is(tok::colon)) {
+        ConsumeToken();
+      } else {
+        Diag(Tok, diag::err_modifier_expected_colon)
+            << getOpenMPClauseName(Kind);
+        SkipUntil(tok::r_paren, tok::annot_pragma_openmp_end, StopBeforeMatch);
+        Data.RLoc = Tok.getLocation();
+        if (!T.consumeClose())
+          Data.RLoc = T.getCloseLocation();
+        return true;
+      }
     }
 
-    if (Tok.is(tok::colon)) {
-      ConsumeToken();
-      Data.ExtraModifier = OMPC_NUMTEAMS_lower_bound;
-      Data.ExtraModifierExpr = FirstExpr.get();
-      Data.ExtraModifierLoc = TLoc;
-      TPA.Commit();
-    } else {
-      TPA.Revert();
+    // The lower bound modifier must appear as the last modifier.
+    if (CanParseLowerBoundModifier) {
+      TentativeParsingAction TPA(*this);
+      SourceLocation TLoc = Tok.getLocation();
+      ExprResult FirstExpr = ParseAssignmentExpression();
+      if (FirstExpr.isInvalid()) {
+        SkipUntil(tok::r_paren, tok::annot_pragma_openmp_end, StopBeforeMatch);
+        Data.RLoc = Tok.getLocation();
+        if (!T.consumeClose())
+          Data.RLoc = T.getCloseLocation();
+        TPA.Commit();
+        return true;
+      }
+
+      if (Tok.is(tok::colon)) {
+        // Correctly parsed the lower bound modifier.
+        ConsumeToken();
+        Data.ExtraModifierArray[Mod] = OMPC_NUMTEAMS_lower_bound;
+        Data.ExtraModifierExprArray[Mod] = FirstExpr.get();
+        Data.ExtraModifierLocArray[Mod] = TLoc;
+        TPA.Commit();
+      } else {
+        // Could not find the colon after the expression, revert it and let 
this
+        // function parse it as a list of expressions.
+        TPA.Revert();
+      }
     }
   }
 
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 134b98d8e80cf..99925ecbe1acc 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -13621,23 +13621,69 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTargetUpdateDirective(
                                           Clauses, AStmt);
 }
 
-/// This checks whether a \p ClauseType clause \p C has at most \p Max
-/// expression. If not, a diag of number \p Diag will be emitted.
-template <typename ClauseType>
-static bool checkNumExprsInClause(SemaBase &SemaRef,
-                                  ArrayRef<OMPClause *> Clauses,
-                                  unsigned MaxNum, unsigned Diag) {
-  auto ClauseItr = llvm::find_if(Clauses, llvm::IsaPred<ClauseType>);
-  if (ClauseItr == Clauses.end())
-    return true;
-  const auto *C = cast<ClauseType>(*ClauseItr);
-  auto VarList = C->getVarRefs();
-  if (VarList.size() > MaxNum) {
-    SemaRef.Diag(VarList[MaxNum]->getBeginLoc(), Diag)
-        << getOpenMPClauseNameForDiag(C->getClauseKind());
+template <typename ClauseT>
+static bool checkClauseNumExprs(SemaBase &SemaRef, const ClauseT *Clause,
+                                const OMPXBareClause *BareClause) {
+  if (!Clause)
     return false;
+
+  uint64_t MaxExprs = BareClause ? 3 : 1;
+
+  const Expr *DimsExpr = Clause->getDimsModifierExpr();
+  if (DimsExpr) {
+    // Cannot verify the size yet.
+    if (DimsExpr->isInstantiationDependent())
+      return false;
+
+    MaxExprs =
+        DimsExpr->EvaluateKnownConstInt(SemaRef.getASTContext()).getExtValue();
   }
-  return true;
+
+  size_t NumVars = Clause->getVarRefs().size();
+  if (NumVars > MaxExprs) {
+    SemaRef.Diag(Clause->getBeginLoc(), diag::err_omp_unexpected_num_exprs)
+        << getOpenMPClauseName(Clause->getClauseKind());
+    return true;
+  }
+  if (NumVars > 3) {
+    SemaRef.Diag(Clause->getBeginLoc(), diag::err_omp_max_three_exprs)
+        << getOpenMPClauseName(Clause->getClauseKind());
+    return true;
+  }
+  return false;
+}
+
+static bool checkNumExprsInClauses(SemaBase &SemaRef,
+                                   ArrayRef<OMPClause *> Clauses) {
+  auto BareClauseIt = llvm::find_if(Clauses, llvm::IsaPred<OMPXBareClause>);
+  auto ThreadLimitIt =
+      llvm::find_if(Clauses, llvm::IsaPred<OMPThreadLimitClause>);
+  auto NumTeamsIt = llvm::find_if(Clauses, llvm::IsaPred<OMPNumTeamsClause>);
+
+  const auto *BareClause = BareClauseIt != Clauses.end()
+                               ? cast<OMPXBareClause>(*BareClauseIt)
+                               : nullptr;
+  const auto *ThreadLimitClause =
+      ThreadLimitIt != Clauses.end()
+          ? cast<OMPThreadLimitClause>(*ThreadLimitIt)
+          : nullptr;
+  const auto *NumTeamsClause = NumTeamsIt != Clauses.end()
+                                   ? cast<OMPNumTeamsClause>(*NumTeamsIt)
+                                   : nullptr;
+
+  if (BareClause) {
+    if (!NumTeamsClause || !ThreadLimitClause) {
+      SemaRef.Diag(BareClause->getBeginLoc(), diag::err_ompx_bare_no_grid);
+      return true;
+    }
+    if (ThreadLimitClause->getModifier() == OMPC_THREADLIMIT_dims ||
+        NumTeamsClause->getModifier() == OMPC_NUMTEAMS_dims) {
+      SemaRef.Diag(BareClause->getBeginLoc(), diag::err_ompx_bare_no_dims);
+      return true;
+    }
+  }
+  return checkClauseNumExprs(SemaRef, ThreadLimitClause, BareClause) ||
+         checkClauseNumExprs(SemaRef, NumTeamsClause, BareClause);
 }
 
 StmtResult SemaOpenMP::ActOnOpenMPTeamsDirective(ArrayRef<OMPClause *> Clauses,
@@ -13647,10 +13693,7 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTeamsDirective(ArrayRef<OMPClause *> Clauses,
   if (!AStmt)
     return StmtError();
 
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed) 
||
-      !checkNumExprsInClause<OMPThreadLimitClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed))
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
 
   // Report affected OpenMP target offloading behavior when in HIP lang-mode.
@@ -14414,30 +14457,9 @@ StmtResult SemaOpenMP::ActOnOpenMPTargetTeamsDirective(
 
   setBranchProtectedScope(SemaRef, OMPD_target_teams, AStmt);
 
-  const OMPClause *BareClause = nullptr;
-  bool HasThreadLimitAndNumTeamsClause = hasClauses(Clauses, OMPC_num_teams) &&
-                                         hasClauses(Clauses, 
OMPC_thread_limit);
-  bool HasBareClause = llvm::any_of(Clauses, [&](const OMPClause *C) {
-    BareClause = C;
-    return C->getClauseKind() == OMPC_ompx_bare;
-  });
-
-  if (HasBareClause && !HasThreadLimitAndNumTeamsClause) {
-    Diag(BareClause->getBeginLoc(), diag::err_ompx_bare_no_grid);
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
-  }
 
-  unsigned ClauseMaxNumExprs = HasBareClause ? 3 : 1;
-  unsigned DiagNo = HasBareClause
-                        ? diag::err_ompx_more_than_three_expr_not_allowed
-                        : diag::err_omp_multi_expr_not_allowed;
-
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(*this, Clauses,
-                                                ClauseMaxNumExprs, DiagNo) ||
-      !checkNumExprsInClause<OMPThreadLimitClause>(*this, Clauses,
-                                                   ClauseMaxNumExprs, DiagNo)) 
{
-    return StmtError();
-  }
   return OMPTargetTeamsDirective::Create(getASTContext(), StartLoc, EndLoc,
                                          Clauses, AStmt);
 }
@@ -14448,10 +14470,7 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTargetTeamsDistributeDirective(
   if (!AStmt)
     return StmtError();
 
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed) 
||
-      !checkNumExprsInClause<OMPThreadLimitClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed))
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
 
   CapturedStmt *CS =
@@ -14480,10 +14499,7 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTargetTeamsDistributeParallelForDirective(
   if (!AStmt)
     return StmtError();
 
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed) 
||
-      !checkNumExprsInClause<OMPThreadLimitClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed))
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
 
   CapturedStmt *CS = setBranchProtectedScope(
@@ -14513,10 +14529,7 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTargetTeamsDistributeParallelForSimdDirective(
   if (!AStmt)
     return StmtError();
 
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed) 
||
-      !checkNumExprsInClause<OMPThreadLimitClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed))
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
 
   CapturedStmt *CS = setBranchProtectedScope(
@@ -14549,10 +14562,7 @@ StmtResult 
SemaOpenMP::ActOnOpenMPTargetTeamsDistributeSimdDirective(
   if (!AStmt)
     return StmtError();
 
-  if (!checkNumExprsInClause<OMPNumTeamsClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed) 
||
-      !checkNumExprsInClause<OMPThreadLimitClause>(
-          *this, Clauses, /*MaxNum=*/1, diag::err_omp_multi_expr_not_allowed))
+  if (checkNumExprsInClauses(*this, Clauses))
     return StmtError();
 
   CapturedStmt *CS = setBranchProtectedScope(
@@ -17395,6 +17405,7 @@ ExprResult 
SemaOpenMP::VerifyPositiveIntegerConstantInClause(
     DSAStack->setAssociatedLoops(Result.getExtValue());
   else if (CKind == OMPC_ordered)
     DSAStack->setAssociatedLoops(Result.getExtValue());
+
   return ICE;
 }
 
@@ -19332,11 +19343,19 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPVarListClause(OpenMPClauseKind Kind,
     assert(0 <= ExtraModifier && ExtraModifier <= OMPC_NUMTEAMS_unknown &&
            "Unexpected num_teams modifier.");
     Res = ActOnOpenMPNumTeamsClause(
-        VarList, static_cast<OpenMPNumTeamsClauseModifier>(ExtraModifier),
-        ExtraModifierExpr, ExtraModifierLoc, StartLoc, LParenLoc, EndLoc);
+        VarList,
+        static_cast<OpenMPNumTeamsClauseModifier>(Data.ExtraModifierArray[0]),
+        Data.ExtraModifierExprArray[0], Data.ExtraModifierLocArray[0],
+        static_cast<OpenMPNumTeamsClauseModifier>(Data.ExtraModifierArray[1]),
+        Data.ExtraModifierExprArray[1], Data.ExtraModifierLocArray[1], 
StartLoc,
+        LParenLoc, EndLoc);
     break;
   case OMPC_thread_limit:
-    Res = ActOnOpenMPThreadLimitClause(VarList, StartLoc, LParenLoc, EndLoc);
+    assert(0 <= ExtraModifier && ExtraModifier <= OMPC_THREADLIMIT_unknown &&
+           "Unexpected num_teams modifier.");
+    Res = ActOnOpenMPThreadLimitClause(
+        VarList, static_cast<OpenMPThreadLimitClauseModifier>(ExtraModifier),
+        ExtraModifierExpr, ExtraModifierLoc, StartLoc, LParenLoc, EndLoc);
     break;
   case OMPC_if:
   case OMPC_depobj:
@@ -24401,9 +24420,45 @@ const ValueDecl 
*SemaOpenMP::getOpenMPDeclareMapperVarName() const {
   return cast<DeclRefExpr>(DSAStack->getDeclareMapperVarRef())->getDecl();
 }
 
+ExprResult SemaOpenMP::ActOnOpenMPDimsModifier(OpenMPClauseKind ClauseKind,
+                                               int Modifier, Expr 
*ModifierExpr,
+                                               SourceLocation ModifierLoc,
+                                               ArrayRef<Expr *> VarList,
+                                               SourceLocation VarListEndLoc) {
+  assert(ModifierExpr && "Unexpected modifier expression.");
+
+  if (getLangOpts().OpenMP < 61) {
+    Diag(ModifierLoc, diag::err_omp_modifier_requires_version)
+        << getOpenMPSimpleClauseTypeName(ClauseKind, Modifier)
+        << getOpenMPClauseName(ClauseKind) << "6.1";
+    return ExprError();
+  }
+
+  ExprResult DimsRes = VerifyPositiveIntegerConstantInClause(
+      ModifierExpr, ClauseKind, /*StrictlyPositive=*/true,
+      /*SuppressExprDiags=*/false);
+  if (DimsRes.isInvalid())
+    return ExprError();
+
+  ModifierExpr = DimsRes.get();
+  if (ModifierExpr->isInstantiationDependent())
+    return DimsRes;
+
+  uint64_t NumDims =
+      ModifierExpr->EvaluateKnownConstInt(getASTContext()).getExtValue();
+  if (NumDims == VarList.size())
+    return DimsRes;
+
+  Diag(VarListEndLoc, diag::err_omp_unexpected_num_exprs)
+      << getOpenMPClauseName(ClauseKind);
+  return ExprError();
+}
+
 OMPClause *SemaOpenMP::ActOnOpenMPNumTeamsClause(
     ArrayRef<Expr *> VarList, OpenMPNumTeamsClauseModifier Modifier,
-    Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+    Expr *ModifierExpr, SourceLocation ModifierLoc,
+    OpenMPNumTeamsClauseModifier ModifierExtra, Expr *,
+    SourceLocation ModifierExtraLoc, SourceLocation StartLoc,
     SourceLocation LParenLoc, SourceLocation EndLoc) {
   if (VarList.empty())
     return nullptr;
@@ -24417,10 +24472,27 @@ OMPClause *SemaOpenMP::ActOnOpenMPNumTeamsClause(
   }
 
   // OpenMP [teams Construct, Restrictions]
-  // The lower-bound expression in num_teams must evaluate to a positive 
integer
-  // value.
-  if (ModifierExpr) {
-    assert(Modifier == OMPC_NUMTEAMS_lower_bound && "Unexpected modifier.");
+  // The lower-bound modifier cannot be specified if the dims modifier is
+  // specified.
+  if (Modifier != OMPC_NUMTEAMS_unknown &&
+      ModifierExtra != OMPC_NUMTEAMS_unknown) {
+    Diag(ModifierExtraLoc, diag::err_omp_incompatible_modifiers)
+        << getOpenMPSimpleClauseTypeName(llvm::omp::OMPC_num_teams,
+                                         ModifierExtra)
+        << getOpenMPSimpleClauseTypeName(llvm::omp::OMPC_num_teams, Modifier)
+        << getOpenMPClauseName(llvm::omp::OMPC_num_teams);
+    ModifierExtra = OMPC_NUMTEAMS_unknown;
+    ModifierExtraLoc = SourceLocation();
+  }
+
+  if (Modifier == OMPC_NUMTEAMS_dims) {
+    ExprResult Res = ActOnOpenMPDimsModifier(
+        OMPC_num_teams, Modifier, ModifierExpr, ModifierLoc, VarList, EndLoc);
+    if (Res.isInvalid())
+      return nullptr;
+    ModifierExpr = Res.get();
+  } else if (Modifier == OMPC_NUMTEAMS_lower_bound) {
+    assert(ModifierExpr && "Unexpected modifier expression.");
 
     if (getLangOpts().OpenMP < 51) {
       Diag(ModifierLoc, diag::err_omp_modifier_requires_version)
@@ -24429,6 +24501,9 @@ OMPClause *SemaOpenMP::ActOnOpenMPNumTeamsClause(
       return nullptr;
     }
 
+    // OpenMP [teams Construct, Restrictions]
+    // The lower-bound expression in num_teams must evaluate to a positive
+    // integer value.
     if (!isNonNegativeIntegerValue(ModifierExpr, SemaRef, OMPC_num_teams,
                                    /*StrictlyPositive=*/true))
       return nullptr;
@@ -24485,10 +24560,10 @@ OMPClause *SemaOpenMP::ActOnOpenMPNumTeamsClause(
                                    ModifierExpr, ModifierLoc, PreInit);
 }
 
-OMPClause *SemaOpenMP::ActOnOpenMPThreadLimitClause(ArrayRef<Expr *> VarList,
-                                                    SourceLocation StartLoc,
-                                                    SourceLocation LParenLoc,
-                                                    SourceLocation EndLoc) {
+OMPClause *SemaOpenMP::ActOnOpenMPThreadLimitClause(
+    ArrayRef<Expr *> VarList, OpenMPThreadLimitClauseModifier Modifier,
+    Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+    SourceLocation LParenLoc, SourceLocation EndLoc) {
   if (VarList.empty())
     return nullptr;
 
@@ -24500,12 +24575,22 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPThreadLimitClause(ArrayRef<Expr *> VarList,
       return nullptr;
   }
 
+  if (Modifier == OMPC_THREADLIMIT_dims) {
+    ExprResult Res =
+        ActOnOpenMPDimsModifier(OMPC_thread_limit, Modifier, ModifierExpr,
+                                ModifierLoc, VarList, EndLoc);
+    if (Res.isInvalid())
+      return nullptr;
+    ModifierExpr = Res.get();
+  }
+
   OpenMPDirectiveKind DKind = DSAStack->getCurrentDirective();
   OpenMPDirectiveKind CaptureRegion = getOpenMPCaptureRegionForClause(
       DKind, OMPC_thread_limit, getLangOpts().OpenMP);
   if (CaptureRegion == OMPD_unknown || 
SemaRef.CurContext->isDependentContext())
     return OMPThreadLimitClause::Create(getASTContext(), CaptureRegion,
                                         StartLoc, LParenLoc, EndLoc, VarList,
+                                        Modifier, ModifierExpr, ModifierLoc,
                                         /*PreInit=*/nullptr);
 
   llvm::MapVector<const Expr *, DeclRefExpr *> Captures;
@@ -24516,9 +24601,15 @@ OMPClause 
*SemaOpenMP::ActOnOpenMPThreadLimitClause(ArrayRef<Expr *> VarList,
     Vars.push_back(ValExpr);
   }
 
+  if (ModifierExpr) {
+    ModifierExpr = SemaRef.MakeFullExpr(ModifierExpr).get();
+    ModifierExpr = tryBuildCapture(SemaRef, ModifierExpr, Captures).get();
+  }
+
   Stmt *PreInit = buildPreInits(getASTContext(), Captures);
   return OMPThreadLimitClause::Create(getASTContext(), CaptureRegion, StartLoc,
-                                      LParenLoc, EndLoc, Vars, PreInit);
+                                      LParenLoc, EndLoc, Vars, Modifier,
+                                      ModifierExpr, ModifierLoc, PreInit);
 }
 
 OMPClause *SemaOpenMP::ActOnOpenMPPriorityClause(Expr *Priority,
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 3c8fcbe582b43..92df2e622a37c 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -2146,23 +2146,26 @@ class TreeTransform {
   /// Subclasses may override this routine to provide different behavior.
   OMPClause *RebuildOMPNumTeamsClause(
       ArrayRef<Expr *> VarList, OpenMPNumTeamsClauseModifier Modifier,
-      Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+      Expr *ModifierExpr, SourceLocation ModifierLoc,
+      OpenMPNumTeamsClauseModifier ModifierExtra, Expr *ModifierExtraExpr,
+      SourceLocation ModifierExtraLoc, SourceLocation StartLoc,
       SourceLocation LParenLoc, SourceLocation EndLoc) {
     return getSema().OpenMP().ActOnOpenMPNumTeamsClause(
-        VarList, Modifier, ModifierExpr, ModifierLoc, StartLoc, LParenLoc,
-        EndLoc);
+        VarList, Modifier, ModifierExpr, ModifierLoc, ModifierExtra,
+        ModifierExtraExpr, ModifierExtraLoc, StartLoc, LParenLoc, EndLoc);
   }
 
   /// Build a new OpenMP 'thread_limit' clause.
   ///
   /// By default, performs semantic analysis to build the new statement.
   /// Subclasses may override this routine to provide different behavior.
-  OMPClause *RebuildOMPThreadLimitClause(ArrayRef<Expr *> VarList,
-                                         SourceLocation StartLoc,
-                                         SourceLocation LParenLoc,
-                                         SourceLocation EndLoc) {
-    return getSema().OpenMP().ActOnOpenMPThreadLimitClause(VarList, StartLoc,
-                                                           LParenLoc, EndLoc);
+  OMPClause *RebuildOMPThreadLimitClause(
+      ArrayRef<Expr *> VarList, OpenMPThreadLimitClauseModifier Modifier,
+      Expr *ModifierExpr, SourceLocation ModifierLoc, SourceLocation StartLoc,
+      SourceLocation LParenLoc, SourceLocation EndLoc) {
+    return getSema().OpenMP().ActOnOpenMPThreadLimitClause(
+        VarList, Modifier, ModifierExpr, ModifierLoc, StartLoc, LParenLoc,
+        EndLoc);
   }
 
   /// Build a new OpenMP 'priority' clause.
@@ -11611,7 +11614,8 @@ 
TreeTransform<Derived>::TransformOMPNumTeamsClause(OMPNumTeamsClause *C) {
   }
   return getDerived().RebuildOMPNumTeamsClause(
       Vars, C->getModifier(), ModifierExpr, C->getModifierLoc(),
-      C->getBeginLoc(), C->getLParenLoc(), C->getEndLoc());
+      OMPC_NUMTEAMS_unknown, nullptr, SourceLocation(), C->getBeginLoc(),
+      C->getLParenLoc(), C->getEndLoc());
 }
 
 template <typename Derived>
@@ -11625,8 +11629,16 @@ 
TreeTransform<Derived>::TransformOMPThreadLimitClause(OMPThreadLimitClause *C) {
       return nullptr;
     Vars.push_back(EVar.get());
   }
+  Expr *ModifierExpr = C->getModifierExpr();
+  if (ModifierExpr) {
+    ExprResult EVar = getDerived().TransformExpr(cast<Expr>(ModifierExpr));
+    if (EVar.isInvalid())
+      return nullptr;
+    ModifierExpr = EVar.get();
+  }
   return getDerived().RebuildOMPThreadLimitClause(
-      Vars, C->getBeginLoc(), C->getLParenLoc(), C->getEndLoc());
+      Vars, C->getModifier(), ModifierExpr, C->getModifierLoc(),
+      C->getBeginLoc(), C->getLParenLoc(), C->getEndLoc());
 }
 
 template <typename Derived>
diff --git a/clang/lib/Serialization/ASTReader.cpp 
b/clang/lib/Serialization/ASTReader.cpp
index b01b18fe3e0ec..3189bf3431c1e 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -12608,6 +12608,9 @@ void 
OMPClauseReader::VisitOMPNumTeamsClause(OMPNumTeamsClause *C) {
 }
 
 void OMPClauseReader::VisitOMPThreadLimitClause(OMPThreadLimitClause *C) {
+  C->setModifier(Record.readEnum<OpenMPThreadLimitClauseModifier>());
+  C->setModifierLoc(Record.readSourceLocation());
+  C->setModifierExpr(Record.readSubExpr());
   VisitOMPClauseWithPreInit(C);
   C->setLParenLoc(Record.readSourceLocation());
   unsigned NumVars = C->varlist_size();
diff --git a/clang/lib/Serialization/ASTWriter.cpp 
b/clang/lib/Serialization/ASTWriter.cpp
index ecf935e3b3548..a305e92b6a602 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -8599,6 +8599,9 @@ void 
OMPClauseWriter::VisitOMPNumTeamsClause(OMPNumTeamsClause *C) {
 
 void OMPClauseWriter::VisitOMPThreadLimitClause(OMPThreadLimitClause *C) {
   Record.push_back(C->varlist_size());
+  Record.writeEnum(C->getModifier());
+  Record.AddSourceLocation(C->getModifierLoc());
+  Record.AddStmt(C->getModifierExpr());
   VisitOMPClauseWithPreInit(C);
   Record.AddSourceLocation(C->getLParenLoc());
   for (auto *VE : C->varlist())
diff --git a/clang/test/OpenMP/dims_modifier_ast_print.cpp 
b/clang/test/OpenMP/dims_modifier_ast_print.cpp
new file mode 100644
index 0000000000000..d47e8353abcad
--- /dev/null
+++ b/clang/test/OpenMP/dims_modifier_ast_print.cpp
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=61 -ast-print %s | FileCheck %s
+// expected-no-diagnostics
+
+void test_ast_print() {
+  int N = 10;
+  int M = 20;
+  constexpr int D = 3;
+
+  // CHECK: #pragma omp target teams num_teams(dims(3):1,2,3) 
thread_limit(dims(2):10,20)
+  #pragma omp target teams num_teams(dims(3): 1, 2, 3) thread_limit(dims(2): 
10, 20)
+  {}
+
+  // CHECK: #pragma omp target teams num_teams(dims(D):1,2,3) 
thread_limit(dims(D):10,20,30)
+  #pragma omp target teams num_teams(dims(D): 1, 2, 3) thread_limit(dims(D): 
10, 20, 30)
+  {}
+
+  // CHECK: #pragma omp target teams num_teams(dims(2):N,N + 1) 
thread_limit(dims(1):M)
+  #pragma omp target teams num_teams(dims(2): N, N + 1) thread_limit(dims(1): 
M)
+  {}
+
+  // CHECK: #pragma omp target teams num_teams(dims(1):N) 
thread_limit(dims(1):M)
+  #pragma omp target teams num_teams(dims(1): N) thread_limit(dims(1): M)
+  {}
+}
+
+template <int D>
+void template_test() {
+  int arr[3] = {1, 2, 3};
+  // CHECK: #pragma omp target teams num_teams(dims(3):arr[0],arr[1],arr[2]) 
thread_limit(dims(1):3)
+  #pragma omp target teams num_teams(dims(3): arr[0], arr[1], arr[2]) 
thread_limit(dims(1): D)
+  {}
+
+  // CHECK: #pragma omp target teams num_teams(dims(3):arr[0],arr[1],arr[2]) 
thread_limit(dims(2):3,arr[0])
+  #pragma omp target teams num_teams(dims(D): arr[0], arr[1], arr[2]) 
thread_limit(dims(2): D, arr[0])
+  {}
+}
+
+void call_templates() {
+  template_test<3>();
+}
diff --git a/clang/test/OpenMP/dims_modifier_messages.cpp 
b/clang/test/OpenMP/dims_modifier_messages.cpp
new file mode 100644
index 0000000000000..680bb1d6d8d13
--- /dev/null
+++ b/clang/test/OpenMP/dims_modifier_messages.cpp
@@ -0,0 +1,124 @@
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 -triple 
x86_64-unknown-unknown %s
+// RUN: %clang_cc1 -verify -fopenmp-simd -fopenmp-version=61 -triple 
x86_64-unknown-unknown %s
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 -triple 
x86_64-unknown-unknown -fopenmp-targets=nvptx64 %s
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=61 -triple 
x86_64-unknown-unknown -fopenmp-targets=amdgcn-amd-amdhsa %s
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=52 -triple 
x86_64-unknown-unknown -DVERSION52 %s
+
+void foo() {
+}
+
+#ifndef VERSION52
+void bar(int N) { // expected-note {{declared here}}
+  // 1. Invalid syntax of the dims modifier.
+
+#pragma omp target teams num_teams(dims 2: 4) // expected-error {{use of 
undeclared identifier 'dims'}}
+  foo();
+
+#pragma omp target thread_limit(dim(2) 4, 5)
+  // expected-error@-1 {{use of undeclared identifier 'dim'}}
+  // expected-error@-2 {{expected ',' or ')' in 'thread_limit' clause}}
+  foo();
+
+#pragma omp target thread_limit(dims((2): 4, 5)
+  // expected-error@-1 {{expected ')'}}
+  // expected-error@-2 {{expected ')'}}
+  // expected-note@-3 {{to match this '('}}
+  // expected-note@-4 {{to match this '('}}
+  // expected-error@-5 {{missing ':' after thread_limit modifier}}
+  foo();
+
+#pragma omp target thread_limit(dims(2)): 4, 5)
+  // expected-error@-1 {{missing ':' after thread_limit modifier}}
+  // expected-warning@-2 {{extra tokens at the end of '#pragma omp target' are 
ignored}}
+  foo();
+
+#pragma omp target thread_limit(dims(2) 4, 5) // expected-error {{missing ':' 
after thread_limit modifier}}
+  foo();
+
+#pragma omp target teams distribute num_teams(dims(): 4) // expected-error 
{{expected expression}}
+  for (int i = 0; i < 10; ++i) {}
+
+  // 2. Mismatching number of expressions.
+
+#pragma omp target teams num_teams(dims(2): 4) // expected-error {{unexpected 
number of expressions in 'num_teams' clause}}
+  foo();
+
+#pragma omp target thread_limit(dims(1): 4, 5) // expected-error {{unexpected 
number of expressions in 'thread_limit' clause}}
+  foo();
+
+#pragma omp target teams distribute num_teams(dims(3): 4, 5) // expected-error 
{{unexpected number of expressions in 'num_teams' clause}}
+  for (int i = 0; i < 10; ++i) {}
+
+  // 3. Exceeding three dimensions.
+
+#pragma omp target teams num_teams(dims(4): 1, 2, 3, 4) // expected-error 
{{maximum three expressions are supported in 'num_teams' clause}}
+  foo();
+
+#pragma omp target thread_limit(dims(2): 1, 2, 3, 4) // expected-error 
{{unexpected number of expressions in 'thread_limit' clause}}
+  foo();
+
+#pragma omp target teams distribute thread_limit(dims(4): 1, 2, 3, 4) // 
expected-error {{maximum three expressions are supported in 'thread_limit' 
clause}}
+  for (int i = 0; i < 10; ++i) {}
+
+  // 4. Invalid use of dims when ompx_bare is present.
+
+#pragma omp target teams ompx_bare num_teams(dims(2): 1, 2) thread_limit(1, 2, 
3) // expected-error {{'ompx_bare' clause cannot be specified with 'dims' 
modifier in 'num_teams' and 'thread_limit' clauses}}
+  foo();
+
+#pragma omp target teams ompx_bare num_teams(1, 2, 3) thread_limit(dims(3): 1, 
2, 3) // expected-error {{'ompx_bare' clause cannot be specified with 'dims' 
modifier in 'num_teams' and 'thread_limit' clauses}}
+  foo();
+
+  // 5. Number of dimensions in dims is invalid.
+
+#pragma omp target teams num_teams(dims(N): 1, 2)
+  // expected-error@-1 {{expression is not an integral constant expression}}
+  // expected-note@-2 {{function parameter 'N' with unknown value cannot be 
used in a constant expression}}
+  foo();
+
+#pragma omp target thread_limit(dims(2.5): 1, 2) // expected-error {{integral 
constant expression must have integral or unscoped enumeration type, not 
'double'}}
+  foo();
+
+#pragma omp target teams distribute num_teams(dims(0): 4) // expected-error 
{{argument to 'num_teams' clause must be a strictly positive integer value}}
+  for (int i = 0; i < 10; ++i) {}
+
+#pragma omp target teams thread_limit(dims(-1): 4) // expected-error 
{{argument to 'thread_limit' clause must be a strictly positive integer value}}
+  foo();
+}
+
+template <int D>
+void template_test() {
+  // 7. Mismatching number of expressions with template arguments.
+
+#pragma omp target teams num_teams(dims(D): 4)
+  // expected-error@-1 {{unexpected number of expressions in 'num_teams' 
clause}}
+  // expected-error@-2 {{argument to 'num_teams' clause must be a strictly 
positive integer value}}
+  foo();
+
+#pragma omp target thread_limit(dims(D): 4, 5)
+  // expected-error@-1 {{unexpected number of expressions in 'thread_limit' 
clause}}
+  // expected-error@-2 {{argument to 'thread_limit' clause must be a strictly 
positive integer value}}
+  foo();
+
+#pragma omp target teams distribute num_teams(dims(D): 4, 5)
+  // expected-error@-1 {{unexpected number of expressions in 'num_teams' 
clause}}
+  // expected-error@-2 {{argument to 'num_teams' clause must be a strictly 
positive integer value}}
+  for (int i = 0; i < 10; ++i) {}
+}
+
+void call_templates() {
+  template_test<3>(); // expected-note {{in instantiation of function template 
specialization 'template_test<3>' requested here}}
+  template_test<0>(); // expected-note {{in instantiation of function template 
specialization 'template_test<0>' requested here}}
+}
+#endif
+
+#ifdef VERSION52
+void version() {
+  // 6. Dims modifier requires OpenMP 6.1.
+
+#pragma omp target teams num_teams(dims(1): 4) // expected-error {{'dims' 
modifier in 'num_teams' clause requires OpenMP 6.1 or later}}
+  foo();
+
+#pragma omp target thread_limit(dims(1): 4) // expected-error {{'dims' 
modifier in 'thread_limit' clause requires OpenMP 6.1 or later}}
+  foo();
+}
+#endif
diff --git a/clang/test/OpenMP/ompx_bare_messages.c 
b/clang/test/OpenMP/ompx_bare_messages.c
index 19ceee5625fee..0fd931954c475 100644
--- a/clang/test/OpenMP/ompx_bare_messages.c
+++ b/clang/test/OpenMP/ompx_bare_messages.c
@@ -19,6 +19,6 @@ void bar() {
 #pragma omp teams ompx_bare // expected-error {{unexpected OpenMP clause 
'ompx_bare' in directive '#pragma omp teams'}} expected-note {{OpenMP extension 
clause 'ompx_bare' only allowed with '#pragma omp target teams'}}
   foo();
 
-#pragma omp target teams ompx_bare // expected-error {{'ompx_bare' clauses 
requires explicit grid size via 'num_teams' and 'thread_limit' clauses}}
+#pragma omp target teams ompx_bare // expected-error {{'ompx_bare' clause 
requires explicit grid size via 'num_teams' and 'thread_limit' clauses}}
   foo();
 }
diff --git a/clang/test/OpenMP/target_teams_distribute_num_teams_messages.cpp 
b/clang/test/OpenMP/target_teams_distribute_num_teams_messages.cpp
index 8bf388f0b5da9..e353fc81d4eca 100644
--- a/clang/test/OpenMP/target_teams_distribute_num_teams_messages.cpp
+++ b/clang/test/OpenMP/target_teams_distribute_num_teams_messages.cpp
@@ -44,16 +44,16 @@ T tmain(T argc) {
 #pragma omp target teams distribute num_teams(3.14) // expected-error 2 
{{expression must have integral or unscoped enumeration type, not 'double'}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute num_teams(1, 2, 3) // expected-error 
{{only one expression allowed in 'num_teams' clause}}
+#pragma omp target teams distribute num_teams(1, 2, 3) // expected-error 
{{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute thread_limit(1, 2, 3) // expected-error 
{{only one expression allowed in 'thread_limit' clause}}
+#pragma omp target teams distribute thread_limit(1, 2, 3) // expected-error 
{{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams ompx_bare num_teams(1, 2, 3, 4) thread_limit(1) // 
expected-error {{at most three expressions are allowed in 'num_teams' clause in 
'target teams ompx_bare' construct}}
+#pragma omp target teams ompx_bare num_teams(1, 2, 3, 4) thread_limit(1) // 
expected-error {{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams ompx_bare num_teams(1) thread_limit(1, 2, 3, 4) // 
expected-error {{at most three expressions are allowed in 'thread_limit' clause 
in 'target teams ompx_bare' construct}}
+#pragma omp target teams ompx_bare num_teams(1) thread_limit(1, 2, 3, 4) // 
expected-error {{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
   return 0;
@@ -97,16 +97,16 @@ int main(int argc, char **argv) {
 #pragma omp target teams distribute num_teams (3.14) // expected-error 
{{expression must have integral or unscoped enumeration type, not 'double'}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute num_teams(1, 2, 3) // expected-error 
{{only one expression allowed in 'num_teams' clause}}
+#pragma omp target teams distribute num_teams(1, 2, 3) // expected-error 
{{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute thread_limit(1, 2, 3) // expected-error 
{{only one expression allowed in 'thread_limit' clause}}
+#pragma omp target teams distribute thread_limit(1, 2, 3) // expected-error 
{{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams ompx_bare num_teams(1, 2, 3, 4) thread_limit(1) // 
expected-error {{at most three expressions are allowed in 'num_teams' clause in 
'target teams ompx_bare' construct}}
+#pragma omp target teams ompx_bare num_teams(1, 2, 3, 4) thread_limit(1) // 
expected-error {{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams ompx_bare num_teams(1) thread_limit(1, 2, 3, 4) // 
expected-error {{at most three expressions are allowed in 'thread_limit' clause 
in 'target teams ompx_bare' construct}}
+#pragma omp target teams ompx_bare num_teams(1) thread_limit(1, 2, 3, 4) // 
expected-error {{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
   return tmain<int, 10>(argc); // expected-note {{in instantiation of function 
template specialization 'tmain<int, 10>' requested here}}
diff --git 
a/clang/test/OpenMP/target_teams_distribute_parallel_for_num_teams_messages.cpp 
b/clang/test/OpenMP/target_teams_distribute_parallel_for_num_teams_messages.cpp
index 092e0137d250d..fb9f4a7def289 100644
--- 
a/clang/test/OpenMP/target_teams_distribute_parallel_for_num_teams_messages.cpp
+++ 
b/clang/test/OpenMP/target_teams_distribute_parallel_for_num_teams_messages.cpp
@@ -43,9 +43,9 @@ T tmain(T argc) {
   for (int i=0; i<100; i++) foo();
 #pragma omp target teams distribute parallel for num_teams(3.14) // 
expected-error 2 {{expression must have integral or unscoped enumeration type, 
not 'double'}}
   for (int i=0; i<100; i++) foo();
-#pragma omp target teams distribute parallel for num_teams(1, 2, 3) // 
expected-error {{only one expression allowed in 'num_teams' clause}}
+#pragma omp target teams distribute parallel for num_teams(1, 2, 3) // 
expected-error {{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
-#pragma omp target teams distribute parallel for thread_limit(1, 2, 3) // 
expected-error {{only one expression allowed in 'thread_limit' clause}}
+#pragma omp target teams distribute parallel for thread_limit(1, 2, 3) // 
expected-error {{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
   return 0;
@@ -89,10 +89,10 @@ int main(int argc, char **argv) {
 #pragma omp target teams distribute parallel for num_teams (3.14) // 
expected-error {{expression must have integral or unscoped enumeration type, 
not 'double'}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute parallel for num_teams(1, 2, 3) // 
expected-error {{only one expression allowed in 'num_teams' clause}}
+#pragma omp target teams distribute parallel for num_teams(1, 2, 3) // 
expected-error {{unexpected number of expressions in 'num_teams' clause}}
   for (int i=0; i<100; i++) foo();
 
-#pragma omp target teams distribute parallel for thread_limit(1, 2, 3) // 
expected-error {{only one expression allowed in 'thread_limit' clause}}
+#pragma omp target teams distribute parallel for thread_limit(1, 2, 3) // 
expected-error {{unexpected number of expressions in 'thread_limit' clause}}
   for (int i=0; i<100; i++) foo();
 
   return tmain<int, 10>(argc); // expected-note {{in instantiation of function 
template specialization 'tmain<int, 10>' requested here}}
diff --git a/clang/test/OpenMP/teams_num_teams_messages.cpp 
b/clang/test/OpenMP/teams_num_teams_messages.cpp
index 683a772295cdf..59c954eb364ba 100644
--- a/clang/test/OpenMP/teams_num_teams_messages.cpp
+++ b/clang/test/OpenMP/teams_num_teams_messages.cpp
@@ -61,10 +61,10 @@ T tmain(T argc) {
 #pragma omp teams num_teams(3.14) // expected-error 2 {{expression must have 
integral or unscoped enumeration type, not 'double'}}
   foo();
 #pragma omp target
-#pragma omp teams num_teams (1, 2, 3) // expected-error {{only one expression 
allowed in 'num_teams' clause}}
+#pragma omp teams num_teams (1, 2, 3) // expected-error {{unexpected number of 
expressions in 'num_teams' clause}}
   foo();
 #pragma omp target
-#pragma omp teams thread_limit(1, 2, 3) // expected-error {{only one 
expression allowed in 'thread_limit' clause}}
+#pragma omp teams thread_limit(1, 2, 3) // expected-error {{unexpected number 
of expressions in 'thread_limit' clause}}
   foo();
 
   return 0;
@@ -121,11 +121,11 @@ int main(int argc, char **argv) {
   foo();
 
 #pragma omp target
-#pragma omp teams num_teams (1, 2, 3) // expected-error {{only one expression 
allowed in 'num_teams' clause}}
+#pragma omp teams num_teams (1, 2, 3) // expected-error {{unexpected number of 
expressions in 'num_teams' clause}}
   foo();
 
 #pragma omp target
-#pragma omp teams thread_limit(1, 2, 3) // expected-error {{only one 
expression allowed in 'thread_limit' clause}}
+#pragma omp teams thread_limit(1, 2, 3) // expected-error {{unexpected number 
of expressions in 'thread_limit' clause}}
   foo();
 
   return tmain<int, 10>(argc); // expected-note {{in instantiation of function 
template specialization 'tmain<int, 10>' requested here}}
@@ -135,28 +135,28 @@ int main(int argc, char **argv) {
 void test_invalid_syntax() {
   int a = 1, b = 2, c = 3;
 
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp teams num_teams(a, b, c)
   { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
   #pragma omp teams num_teams(10:5)
   { }
 
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp target teams num_teams(a, b, c)
   { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
   #pragma omp target teams num_teams(8:3)
   { }
 
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp target teams distribute num_teams(a, b, c)
   for (int i = 0; i < 100; ++i) { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
   #pragma omp target teams distribute num_teams(15:7)
   for (int i = 0; i < 100; ++i) { }
 
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp target teams distribute parallel for num_teams(a, b, c)
   for (int i = 0; i < 100; ++i) { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
@@ -164,14 +164,14 @@ void test_invalid_syntax() {
   for (int i = 0; i < 100; ++i) { }
 
   // Test target teams distribute parallel for simd directive
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp target teams distribute parallel for simd num_teams(a, b, c)
   for (int i = 0; i < 100; ++i) { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
   #pragma omp target teams distribute parallel for simd num_teams(20:6)
   for (int i = 0; i < 100; ++i) { }
 
-  // expected-error@+1 {{only one expression allowed in 'num_teams' clause}}
+  // expected-error@+1 {{unexpected number of expressions in 'num_teams' 
clause}}
   #pragma omp target teams distribute simd num_teams(a, b, c)
   for (int i = 0; i < 100; ++i) { }
   // expected-error@+1 {{lower bound is greater than upper bound in 
'num_teams' clause}}
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 0dbf315166696..af9dc02656597 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2533,6 +2533,8 @@ void OMPClauseEnqueue::VisitOMPNumTeamsClause(const 
OMPNumTeamsClause *C) {
 
 void OMPClauseEnqueue::VisitOMPThreadLimitClause(
     const OMPThreadLimitClause *C) {
+  if (const Expr *Modifier = C->getModifierExpr())
+    Visitor->AddStmt(Modifier);
   VisitOMPClauseList(C);
   VisitOMPClauseWithPreInit(C);
 }

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