[llvm] 2cedaee - [OpenMP] Initial parsing/sema for the 'omp parallel loop' construct

Mike Rice via llvm-commits llvm-commits at lists.llvm.org
Tue Mar 22 13:56:21 PDT 2022


Author: Mike Rice
Date: 2022-03-22T13:55:47-07:00
New Revision: 2cedaee6f7387b39f7a534883050d66fd78e15a4

URL: https://github.com/llvm/llvm-project/commit/2cedaee6f7387b39f7a534883050d66fd78e15a4
DIFF: https://github.com/llvm/llvm-project/commit/2cedaee6f7387b39f7a534883050d66fd78e15a4.diff

LOG: [OpenMP] Initial parsing/sema for the 'omp parallel loop' construct

  Adds basic parsing/sema/serialization support for the
  #pragma omp parallel loop directive.

 Differential Revision: https://reviews.llvm.org/D122247

Added: 
    clang/test/OpenMP/parallel_generic_loop_ast_print.cpp
    clang/test/OpenMP/parallel_generic_loop_messages.cpp

Modified: 
    clang/include/clang-c/Index.h
    clang/include/clang/AST/RecursiveASTVisitor.h
    clang/include/clang/AST/StmtOpenMP.h
    clang/include/clang/Basic/StmtNodes.td
    clang/include/clang/Sema/Sema.h
    clang/include/clang/Serialization/ASTBitCodes.h
    clang/lib/AST/StmtOpenMP.cpp
    clang/lib/AST/StmtPrinter.cpp
    clang/lib/AST/StmtProfile.cpp
    clang/lib/Basic/OpenMPKinds.cpp
    clang/lib/CodeGen/CGStmt.cpp
    clang/lib/Parse/ParseOpenMP.cpp
    clang/lib/Sema/SemaExceptionSpec.cpp
    clang/lib/Sema/SemaOpenMP.cpp
    clang/lib/Sema/TreeTransform.h
    clang/lib/Serialization/ASTReaderStmt.cpp
    clang/lib/Serialization/ASTWriterStmt.cpp
    clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
    clang/test/Analysis/cfg-openmp.cpp
    clang/tools/libclang/CIndex.cpp
    clang/tools/libclang/CXCursor.cpp
    llvm/include/llvm/Frontend/OpenMP/OMP.td

Removed: 
    


################################################################################
diff  --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
index 23ecac4895bd9..4783744359eec 100644
--- a/clang/include/clang-c/Index.h
+++ b/clang/include/clang-c/Index.h
@@ -2608,7 +2608,11 @@ enum CXCursorKind {
    */
   CXCursor_OMPTargetTeamsGenericLoopDirective = 297,
 
-  CXCursor_LastStmt = CXCursor_OMPTargetTeamsGenericLoopDirective,
+  /** OpenMP parallel loop directive.
+   */
+  CXCursor_OMPParallelGenericLoopDirective = 298,
+
+  CXCursor_LastStmt = CXCursor_OMPParallelGenericLoopDirective,
 
   /**
    * Cursor that represents the translation unit itself.

diff  --git a/clang/include/clang/AST/RecursiveASTVisitor.h b/clang/include/clang/AST/RecursiveASTVisitor.h
index b614b6a8bebe0..ceb874598aded 100644
--- a/clang/include/clang/AST/RecursiveASTVisitor.h
+++ b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -3080,6 +3080,8 @@ DEF_TRAVERSE_STMT(OMPTeamsGenericLoopDirective,
 DEF_TRAVERSE_STMT(OMPTargetTeamsGenericLoopDirective,
                   { TRY_TO(TraverseOMPExecutableDirective(S)); })
 
+DEF_TRAVERSE_STMT(OMPParallelGenericLoopDirective,
+                  { TRY_TO(TraverseOMPExecutableDirective(S)); })
 // OpenMP clauses.
 template <typename Derived>
 bool RecursiveASTVisitor<Derived>::TraverseOMPClause(OMPClause *C) {

diff  --git a/clang/include/clang/AST/StmtOpenMP.h b/clang/include/clang/AST/StmtOpenMP.h
index 82d9a69035abd..9178b47a0b5f4 100644
--- a/clang/include/clang/AST/StmtOpenMP.h
+++ b/clang/include/clang/AST/StmtOpenMP.h
@@ -1528,6 +1528,7 @@ class OMPLoopDirective : public OMPLoopBasedDirective {
            T->getStmtClass() == OMPGenericLoopDirectiveClass ||
            T->getStmtClass() == OMPTeamsGenericLoopDirectiveClass ||
            T->getStmtClass() == OMPTargetTeamsGenericLoopDirectiveClass ||
+           T->getStmtClass() == OMPParallelGenericLoopDirectiveClass ||
            T->getStmtClass() == OMPParallelMasterTaskLoopDirectiveClass ||
            T->getStmtClass() == OMPParallelMasterTaskLoopSimdDirectiveClass ||
            T->getStmtClass() == OMPDistributeDirectiveClass ||
@@ -5701,6 +5702,71 @@ class OMPTargetTeamsGenericLoopDirective final : public OMPLoopDirective {
     return T->getStmtClass() == OMPTargetTeamsGenericLoopDirectiveClass;
   }
 };
+
+/// This represents '#pragma omp parallel loop' directive.
+///
+/// \code
+/// #pragma omp parallel loop private(a,b) order(concurrent)
+/// \endcode
+/// In this example directive '#pragma omp parallel loop' has
+/// clauses 'private' with the variables 'a' and 'b', and order(concurrent).
+///
+class OMPParallelGenericLoopDirective final : public OMPLoopDirective {
+  friend class ASTStmtReader;
+  friend class OMPExecutableDirective;
+  /// 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.
+  ///
+  OMPParallelGenericLoopDirective(SourceLocation StartLoc,
+                                  SourceLocation EndLoc, unsigned CollapsedNum)
+      : OMPLoopDirective(OMPParallelGenericLoopDirectiveClass,
+                         llvm::omp::OMPD_parallel_loop, StartLoc, EndLoc,
+                         CollapsedNum) {}
+
+  /// Build an empty directive.
+  ///
+  /// \param CollapsedNum Number of collapsed nested loops.
+  ///
+  explicit OMPParallelGenericLoopDirective(unsigned CollapsedNum)
+      : OMPLoopDirective(OMPParallelGenericLoopDirectiveClass,
+                         llvm::omp::OMPD_parallel_loop, SourceLocation(),
+                         SourceLocation(), CollapsedNum) {}
+
+public:
+  /// Creates directive with a list of \p 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.
+  ///
+  static OMPParallelGenericLoopDirective *
+  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
+         unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses,
+         Stmt *AssociatedStmt, const HelperExprs &Exprs);
+
+  /// 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 OMPParallelGenericLoopDirective *CreateEmpty(const ASTContext &C,
+                                                      unsigned NumClauses,
+                                                      unsigned CollapsedNum,
+                                                      EmptyShell);
+
+  static bool classof(const Stmt *T) {
+    return T->getStmtClass() == OMPParallelGenericLoopDirectiveClass;
+  }
+};
 } // end namespace clang
 
 #endif

diff  --git a/clang/include/clang/Basic/StmtNodes.td b/clang/include/clang/Basic/StmtNodes.td
index 971970be5182c..63568589a3ef3 100644
--- a/clang/include/clang/Basic/StmtNodes.td
+++ b/clang/include/clang/Basic/StmtNodes.td
@@ -285,3 +285,4 @@ def OMPMaskedDirective : StmtNode<OMPExecutableDirective>;
 def OMPGenericLoopDirective : StmtNode<OMPLoopDirective>;
 def OMPTeamsGenericLoopDirective : StmtNode<OMPLoopDirective>;
 def OMPTargetTeamsGenericLoopDirective : StmtNode<OMPLoopDirective>;
+def OMPParallelGenericLoopDirective : StmtNode<OMPLoopDirective>;

diff  --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index abaf760f18c63..f0e33f8b1b728 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -10914,6 +10914,11 @@ class Sema final {
   StmtResult ActOnOpenMPTargetTeamsGenericLoopDirective(
       ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
       SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
+  /// Called on well-formed '\#pragma omp parallel loop' after parsing of the
+  /// associated statement.
+  StmtResult ActOnOpenMPParallelGenericLoopDirective(
+      ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
+      SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA);
   /// Called on well-formed '\#pragma omp cancellation point'.
   StmtResult
   ActOnOpenMPCancellationPointDirective(SourceLocation StartLoc,

diff  --git a/clang/include/clang/Serialization/ASTBitCodes.h b/clang/include/clang/Serialization/ASTBitCodes.h
index 346514f23c7e3..ce83cf9381307 100644
--- a/clang/include/clang/Serialization/ASTBitCodes.h
+++ b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -1963,6 +1963,7 @@ enum StmtCode {
   STMT_OMP_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_TEAMS_GENERIC_LOOP_DIRECTIVE,
   STMT_OMP_TARGET_TEAMS_GENERIC_LOOP_DIRECTIVE,
+  STMT_OMP_PARALLEL_GENERIC_LOOP_DIRECTIVE,
   EXPR_OMP_ARRAY_SECTION,
   EXPR_OMP_ARRAY_SHAPING,
   EXPR_OMP_ITERATOR,

diff  --git a/clang/lib/AST/StmtOpenMP.cpp b/clang/lib/AST/StmtOpenMP.cpp
index a7dcc9da3b0b9..caae6d770ff42 100644
--- a/clang/lib/AST/StmtOpenMP.cpp
+++ b/clang/lib/AST/StmtOpenMP.cpp
@@ -2225,3 +2225,46 @@ OMPTargetTeamsGenericLoopDirective::CreateEmpty(const ASTContext &C,
       C, NumClauses, /*HasAssociatedStmt=*/true,
       numLoopChildren(CollapsedNum, OMPD_target_teams_loop), CollapsedNum);
 }
+
+OMPParallelGenericLoopDirective *OMPParallelGenericLoopDirective::Create(
+    const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
+    unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses, Stmt *AssociatedStmt,
+    const HelperExprs &Exprs) {
+  auto *Dir = createDirective<OMPParallelGenericLoopDirective>(
+      C, Clauses, AssociatedStmt,
+      numLoopChildren(CollapsedNum, OMPD_parallel_loop), 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);
+  return Dir;
+}
+
+OMPParallelGenericLoopDirective *OMPParallelGenericLoopDirective::CreateEmpty(
+    const ASTContext &C, unsigned NumClauses, unsigned CollapsedNum,
+    EmptyShell) {
+  return createEmptyDirective<OMPParallelGenericLoopDirective>(
+      C, NumClauses, /*HasAssociatedStmt=*/true,
+      numLoopChildren(CollapsedNum, OMPD_parallel_loop), CollapsedNum);
+}

diff  --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 4733e3affade4..ccea73ff08547 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -1017,6 +1017,12 @@ void StmtPrinter::VisitOMPTargetTeamsGenericLoopDirective(
   PrintOMPExecutableDirective(Node);
 }
 
+void StmtPrinter::VisitOMPParallelGenericLoopDirective(
+    OMPParallelGenericLoopDirective *Node) {
+  Indent() << "#pragma omp parallel loop";
+  PrintOMPExecutableDirective(Node);
+}
+
 //===----------------------------------------------------------------------===//
 //  Expr printing methods.
 //===----------------------------------------------------------------------===//

diff  --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index 9b765c0bd78e1..6d31a8f9edccf 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -1217,6 +1217,11 @@ void StmtProfiler::VisitOMPTargetTeamsGenericLoopDirective(
   VisitOMPLoopDirective(S);
 }
 
+void StmtProfiler::VisitOMPParallelGenericLoopDirective(
+    const OMPParallelGenericLoopDirective *S) {
+  VisitOMPLoopDirective(S);
+}
+
 void StmtProfiler::VisitExpr(const Expr *S) {
   VisitStmt(S);
 }

diff  --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index 505f6aedfe093..2a57ad8e01039 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -496,7 +496,8 @@ bool clang::isOpenMPLoopDirective(OpenMPDirectiveKind DKind) {
          DKind == OMPD_target_teams_distribute_parallel_for_simd ||
          DKind == OMPD_target_teams_distribute_simd || DKind == OMPD_tile ||
          DKind == OMPD_unroll || DKind == OMPD_loop ||
-         DKind == OMPD_teams_loop || DKind == OMPD_target_teams_loop;
+         DKind == OMPD_teams_loop || DKind == OMPD_target_teams_loop ||
+         DKind == OMPD_parallel_loop;
 }
 
 bool clang::isOpenMPWorksharingDirective(OpenMPDirectiveKind DKind) {
@@ -534,7 +535,8 @@ bool clang::isOpenMPParallelDirective(OpenMPDirectiveKind DKind) {
          DKind == OMPD_target_teams_distribute_parallel_for_simd ||
          DKind == OMPD_parallel_master ||
          DKind == OMPD_parallel_master_taskloop ||
-         DKind == OMPD_parallel_master_taskloop_simd;
+         DKind == OMPD_parallel_master_taskloop_simd ||
+         DKind == OMPD_parallel_loop;
 }
 
 bool clang::isOpenMPTargetExecutionDirective(OpenMPDirectiveKind DKind) {
@@ -604,7 +606,7 @@ bool clang::isOpenMPDistributeDirective(OpenMPDirectiveKind Kind) {
 
 bool clang::isOpenMPGenericLoopDirective(OpenMPDirectiveKind Kind) {
   return Kind == OMPD_loop || Kind == OMPD_teams_loop ||
-         Kind == OMPD_target_teams_loop;
+         Kind == OMPD_target_teams_loop || Kind == OMPD_parallel_loop;
 }
 
 bool clang::isOpenMPPrivate(OpenMPClauseKind Kind) {
@@ -650,6 +652,7 @@ void clang::getOpenMPCaptureRegions(
   case OMPD_parallel_sections:
   case OMPD_distribute_parallel_for:
   case OMPD_distribute_parallel_for_simd:
+  case OMPD_parallel_loop:
     CaptureRegions.push_back(OMPD_parallel);
     break;
   case OMPD_target_teams:

diff  --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 16a881a19bd8b..5796bb849971f 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -402,6 +402,9 @@ void CodeGenFunction::EmitStmt(const Stmt *S, ArrayRef<const Attr *> Attrs) {
   case Stmt::OMPTargetTeamsGenericLoopDirectiveClass:
     llvm_unreachable("target teams loop directive not supported yet.");
     break;
+  case Stmt::OMPParallelGenericLoopDirectiveClass:
+    llvm_unreachable("parallel loop directive not supported yet.");
+    break;
   }
 }
 

diff  --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index 02588cf1e05a3..3cb3010afad8e 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -150,6 +150,7 @@ static OpenMPDirectiveKindExWrapper parseOpenMPDirectiveKind(Parser &P) {
       {OMPD_for, OMPD_simd, OMPD_for_simd},
       {OMPD_parallel, OMPD_for, OMPD_parallel_for},
       {OMPD_parallel_for, OMPD_simd, OMPD_parallel_for_simd},
+      {OMPD_parallel, OMPD_loop, OMPD_parallel_loop},
       {OMPD_parallel, OMPD_sections, OMPD_parallel_sections},
       {OMPD_taskloop, OMPD_simd, OMPD_taskloop_simd},
       {OMPD_target, OMPD_parallel, OMPD_target_parallel},
@@ -2403,6 +2404,7 @@ Parser::DeclGroupPtrTy Parser::ParseOpenMPDeclarativeDirectiveWithExtDecl(
   case OMPD_loop:
   case OMPD_teams_loop:
   case OMPD_target_teams_loop:
+  case OMPD_parallel_loop:
     Diag(Tok, diag::err_omp_unexpected_directive)
         << 1 << getOpenMPDirectiveName(DKind);
     break;
@@ -2760,6 +2762,7 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
   case OMPD_loop:
   case OMPD_teams_loop:
   case OMPD_target_teams_loop:
+  case OMPD_parallel_loop:
   case OMPD_taskloop:
   case OMPD_taskloop_simd:
   case OMPD_master_taskloop:

diff  --git a/clang/lib/Sema/SemaExceptionSpec.cpp b/clang/lib/Sema/SemaExceptionSpec.cpp
index 527c4ba7ecf9e..19b2fc7ffe9ad 100644
--- a/clang/lib/Sema/SemaExceptionSpec.cpp
+++ b/clang/lib/Sema/SemaExceptionSpec.cpp
@@ -1501,6 +1501,7 @@ CanThrowResult Sema::canThrow(const Stmt *S) {
   case Stmt::OMPGenericLoopDirectiveClass:
   case Stmt::OMPTeamsGenericLoopDirectiveClass:
   case Stmt::OMPTargetTeamsGenericLoopDirectiveClass:
+  case Stmt::OMPParallelGenericLoopDirectiveClass:
   case Stmt::ReturnStmtClass:
   case Stmt::SEHExceptStmtClass:
   case Stmt::SEHFinallyStmtClass:

diff  --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 4a74d4f43bf84..5c4edb79d1d61 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -3935,6 +3935,7 @@ void Sema::ActOnOpenMPRegionStart(OpenMPDirectiveKind DKind, Scope *CurScope) {
   case OMPD_parallel_for_simd:
   case OMPD_parallel_sections:
   case OMPD_parallel_master:
+  case OMPD_parallel_loop:
   case OMPD_teams:
   case OMPD_teams_distribute:
   case OMPD_teams_distribute_simd: {
@@ -6320,6 +6321,10 @@ StmtResult Sema::ActOnOpenMPExecutableDirective(
     Res = ActOnOpenMPTargetTeamsGenericLoopDirective(
         ClausesWithImplicit, AStmt, StartLoc, EndLoc, VarsWithInheritedDSA);
     break;
+  case OMPD_parallel_loop:
+    Res = ActOnOpenMPParallelGenericLoopDirective(
+        ClausesWithImplicit, AStmt, StartLoc, EndLoc, VarsWithInheritedDSA);
+    break;
   case OMPD_declare_target:
   case OMPD_end_declare_target:
   case OMPD_threadprivate:
@@ -10312,6 +10317,54 @@ StmtResult Sema::ActOnOpenMPTargetTeamsGenericLoopDirective(
       Context, StartLoc, EndLoc, NestedLoopCount, Clauses, AStmt, B);
 }
 
+StmtResult Sema::ActOnOpenMPParallelGenericLoopDirective(
+    ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
+    SourceLocation EndLoc, VarsWithInheritedDSAType &VarsWithImplicitDSA) {
+  if (!AStmt)
+    return StmtError();
+
+  // OpenMP 5.1 [2.11.7, loop construct, Restrictions]
+  // A list item may not appear in a lastprivate clause unless it is the
+  // loop iteration variable of a loop that is associated with the construct.
+  if (checkGenericLoopLastprivate(*this, Clauses, OMPD_parallel_loop, DSAStack))
+    return StmtError();
+
+  auto *CS = cast<CapturedStmt>(AStmt);
+  // 1.2.2 OpenMP Language Terminology
+  // Structured block - An executable statement with a single entry at the
+  // top and a single exit at the bottom.
+  // The point of exit cannot be a branch out of the structured block.
+  // longjmp() and throw() must not violate the entry/exit criteria.
+  CS->getCapturedDecl()->setNothrow();
+  for (int ThisCaptureLevel = getOpenMPCaptureLevels(OMPD_parallel_loop);
+       ThisCaptureLevel > 1; --ThisCaptureLevel) {
+    CS = cast<CapturedStmt>(CS->getCapturedStmt());
+    // 1.2.2 OpenMP Language Terminology
+    // Structured block - An executable statement with a single entry at the
+    // top and a single exit at the bottom.
+    // The point of exit cannot be a branch out of the structured block.
+    // longjmp() and throw() must not violate the entry/exit criteria.
+    CS->getCapturedDecl()->setNothrow();
+  }
+
+  OMPLoopDirective::HelperExprs B;
+  // In presence of clause 'collapse', it will define the nested loops number.
+  unsigned NestedLoopCount =
+      checkOpenMPLoop(OMPD_parallel_loop, getCollapseNumberExpr(Clauses),
+                      /*OrderedLoopCountExpr=*/nullptr, CS, *this, *DSAStack,
+                      VarsWithImplicitDSA, B);
+  if (NestedLoopCount == 0)
+    return StmtError();
+
+  assert((CurContext->isDependentContext() || B.builtAll()) &&
+         "omp loop exprs were not built");
+
+  setFunctionHasBranchProtectedScope();
+
+  return OMPParallelGenericLoopDirective::Create(
+      Context, StartLoc, EndLoc, NestedLoopCount, Clauses, AStmt, B);
+}
+
 StmtResult Sema::ActOnOpenMPSingleDirective(ArrayRef<OMPClause *> Clauses,
                                             Stmt *AStmt,
                                             SourceLocation StartLoc,
@@ -14619,6 +14672,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_parallel_master:
     case OMPD_parallel_sections:
     case OMPD_parallel_for:
+    case OMPD_parallel_loop:
     case OMPD_target:
     case OMPD_target_teams:
     case OMPD_target_teams_distribute:
@@ -14693,6 +14747,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_parallel_sections:
     case OMPD_parallel_for:
     case OMPD_parallel_for_simd:
+    case OMPD_parallel_loop:
     case OMPD_distribute_parallel_for:
     case OMPD_distribute_parallel_for_simd:
     case OMPD_parallel_master_taskloop:
@@ -14798,6 +14853,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_parallel_sections:
     case OMPD_parallel_for:
     case OMPD_parallel_for_simd:
+    case OMPD_parallel_loop:
     case OMPD_target:
     case OMPD_target_simd:
     case OMPD_target_parallel:
@@ -14882,6 +14938,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_parallel_sections:
     case OMPD_parallel_for:
     case OMPD_parallel_for_simd:
+    case OMPD_parallel_loop:
     case OMPD_target:
     case OMPD_target_simd:
     case OMPD_target_parallel:
@@ -14990,6 +15047,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_loop:
     case OMPD_teams_loop:
     case OMPD_target_teams_loop:
+    case OMPD_parallel_loop:
     case OMPD_simd:
     case OMPD_tile:
     case OMPD_unroll:
@@ -15074,6 +15132,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_loop:
     case OMPD_teams_loop:
     case OMPD_target_teams_loop:
+    case OMPD_parallel_loop:
     case OMPD_simd:
     case OMPD_tile:
     case OMPD_unroll:
@@ -15159,6 +15218,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_end_declare_target:
     case OMPD_loop:
     case OMPD_teams_loop:
+    case OMPD_parallel_loop:
     case OMPD_simd:
     case OMPD_tile:
     case OMPD_unroll:
@@ -15245,6 +15305,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
     case OMPD_loop:
     case OMPD_teams_loop:
     case OMPD_target_teams_loop:
+    case OMPD_parallel_loop:
     case OMPD_simd:
     case OMPD_tile:
     case OMPD_unroll:

diff  --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 31d7c5a13fc1f..bbca7d86fc81a 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -9271,6 +9271,17 @@ StmtResult TreeTransform<Derived>::TransformOMPTargetTeamsGenericLoopDirective(
   return Res;
 }
 
+template <typename Derived>
+StmtResult TreeTransform<Derived>::TransformOMPParallelGenericLoopDirective(
+    OMPParallelGenericLoopDirective *D) {
+  DeclarationNameInfo DirName;
+  getDerived().getSema().StartOpenMPDSABlock(OMPD_parallel_loop, DirName,
+                                             nullptr, D->getBeginLoc());
+  StmtResult Res = getDerived().TransformOMPExecutableDirective(D);
+  getDerived().getSema().EndOpenMPDSABlock(Res.get());
+  return Res;
+}
+
 //===----------------------------------------------------------------------===//
 // OpenMP clause transformation
 //===----------------------------------------------------------------------===//

diff  --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index 028f8a5d4771f..1e2d44c222690 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -2648,6 +2648,11 @@ void ASTStmtReader::VisitOMPTargetTeamsGenericLoopDirective(
   VisitOMPLoopDirective(D);
 }
 
+void ASTStmtReader::VisitOMPParallelGenericLoopDirective(
+    OMPParallelGenericLoopDirective *D) {
+  VisitOMPLoopDirective(D);
+}
+
 //===----------------------------------------------------------------------===//
 // ASTReader Implementation
 //===----------------------------------------------------------------------===//
@@ -3619,6 +3624,14 @@ Stmt *ASTReader::ReadStmtFromStream(ModuleFile &F) {
       break;
     }
 
+    case STMT_OMP_PARALLEL_GENERIC_LOOP_DIRECTIVE: {
+      unsigned CollapsedNum = Record[ASTStmtReader::NumStmtFields];
+      unsigned NumClauses = Record[ASTStmtReader::NumStmtFields + 1];
+      S = OMPParallelGenericLoopDirective::CreateEmpty(Context, NumClauses,
+                                                       CollapsedNum, Empty);
+      break;
+    }
+
     case EXPR_CXX_OPERATOR_CALL:
       S = CXXOperatorCallExpr::CreateEmpty(
           Context, /*NumArgs=*/Record[ASTStmtReader::NumExprFields],

diff  --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 8a616bffb2583..906c1b52d8a6b 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -2607,6 +2607,12 @@ void ASTStmtWriter::VisitOMPTargetTeamsGenericLoopDirective(
   Code = serialization::STMT_OMP_TARGET_TEAMS_GENERIC_LOOP_DIRECTIVE;
 }
 
+void ASTStmtWriter::VisitOMPParallelGenericLoopDirective(
+    OMPParallelGenericLoopDirective *D) {
+  VisitOMPLoopDirective(D);
+  Code = serialization::STMT_OMP_PARALLEL_GENERIC_LOOP_DIRECTIVE;
+}
+
 //===----------------------------------------------------------------------===//
 // ASTWriter Implementation
 //===----------------------------------------------------------------------===//

diff  --git a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
index 0f1f8cef5d5ca..e38c90603299a 100644
--- a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -1299,6 +1299,7 @@ void ExprEngine::Visit(const Stmt *S, ExplodedNode *Pred,
     case Stmt::OMPGenericLoopDirectiveClass:
     case Stmt::OMPTeamsGenericLoopDirectiveClass:
     case Stmt::OMPTargetTeamsGenericLoopDirectiveClass:
+    case Stmt::OMPParallelGenericLoopDirectiveClass:
     case Stmt::CapturedStmtClass:
     case Stmt::OMPUnrollDirectiveClass:
     case Stmt::OMPMetaDirectiveClass: {

diff  --git a/clang/test/Analysis/cfg-openmp.cpp b/clang/test/Analysis/cfg-openmp.cpp
index 4939b49dd69bf..7d398fdb85f2d 100644
--- a/clang/test/Analysis/cfg-openmp.cpp
+++ b/clang/test/Analysis/cfg-openmp.cpp
@@ -725,3 +725,25 @@ void targetteamsloop(int argc) {
   for (int i = 0; i < 10; ++i)
     argc = x;
 }
+
+// CHECK-LABEL:  void parallelloop(int argc)
+void parallelloop(int argc) {
+  int x, cond, fp, rd;
+// CHECK-DAG:   [B3]
+// CHECK-DAG:  [[#PFB:]]: x
+// CHECK-DAG:  [[#PFB+1]]: [B3.[[#PFB]]] (ImplicitCastExpr, LValueToRValue, int)
+// CHECK-DAG:  [[#PFB+2]]: argc
+// CHECK-DAG:  [[#PFB+3]]: [B3.[[#PFB+2]]] = [B3.[[#PFB+1]]]
+// CHECK-DAG:   [B1]
+// CHECK-DAG:  [[#PF:]]: cond
+// CHECK-DAG:  [[#PF+1]]: [B1.[[#PF]]] (ImplicitCastExpr, LValueToRValue, int)
+// CHECK-DAG:  [[#PF+2]]: [B1.[[#PF+1]]] (ImplicitCastExpr, IntegralToBoolean, _Bool)
+// CHECK-DAG:  [[#PF+3]]: fp
+// CHECK-DAG:  [[#PF+4]]: rd
+// CHECK-DAG:  [[#PF+5]]: #pragma omp parallel loop if(cond) firstprivate(fp) reduction(&: rd)
+// CHECK-DAG:    for (int i = 0;
+// CHECK-DAG:        [B3.[[#PFB+3]]];
+#pragma omp parallel loop if(cond) firstprivate(fp) reduction(&:rd)
+  for (int i = 0; i < 10; ++i)
+    argc = x;
+}

diff  --git a/clang/test/OpenMP/parallel_generic_loop_ast_print.cpp b/clang/test/OpenMP/parallel_generic_loop_ast_print.cpp
new file mode 100644
index 0000000000000..3796ef3d71bb0
--- /dev/null
+++ b/clang/test/OpenMP/parallel_generic_loop_ast_print.cpp
@@ -0,0 +1,123 @@
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fopenmp -fopenmp-version=51 \
+// RUN:   -fsyntax-only -verify %s
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fopenmp -fopenmp-version=51 \
+// RUN:   -ast-print %s | FileCheck %s
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fopenmp -fopenmp-version=51 \
+// RUN:   -emit-pch -o %t %s
+
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fopenmp -fopenmp-version=51 \
+// RUN:   -include-pch %t -ast-print %s | FileCheck %s
+
+// expected-no-diagnostics
+
+#ifndef HEADER
+#define HEADER
+
+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;
+
+//CHECK: template <typename T, int C> void templ_foo(T t) {
+//CHECK:   T j, z;
+//CHECK:   #pragma omp parallel loop collapse(C) reduction(+: z) lastprivate(j) bind(thread)
+//CHECK:   for (T i = 0; i < t; ++i)
+//CHECK:       for (j = 0; j < t; ++j)
+//CHECK:           z += i + j;
+//CHECK: }
+
+//CHECK: template<> void templ_foo<int, 2>(int t) {
+//CHECK:     int j, z;
+//CHECK:     #pragma omp parallel loop collapse(2) reduction(+: z) lastprivate(j) bind(thread)
+//CHECK:         for (int i = 0; i < t; ++i)
+//CHECK:             for (j = 0; j < t; ++j)
+//CHECK:                 z += i + j;
+//CHECK: }
+template <typename T, int C>
+void templ_foo(T t) {
+
+  T j,z;
+  #pragma omp parallel loop collapse(C) reduction(+:z) lastprivate(j) bind(thread)
+  for (T i = 0; i<t; ++i)
+    for (j = 0; j<t; ++j)
+      z += i+j;
+}
+
+
+//CHECK: void test() {
+void test() {
+  constexpr int N = 100;
+  float MTX[N][N];
+  int aaa[1000];
+
+  //CHECK: #pragma omp target teams distribute parallel for map(tofrom: MTX)
+  //CHECK: #pragma omp parallel loop
+  #pragma omp target teams distribute parallel for map(MTX)
+  for (auto i = 0; i < N; ++i) {
+    #pragma omp parallel loop
+    for (auto j = 0; j < N; ++j) {
+      MTX[i][j] = 0;
+    }
+  }
+
+  //CHECK: #pragma omp target teams
+  //CHECK: #pragma omp parallel loop
+  #pragma omp target teams
+  for (int i=0; i<1000; ++i) {
+    #pragma omp parallel loop
+    for (int j=0; j<100; j++) {
+      aaa[i] += i + j;
+    }
+  }
+
+  int j, z, z1, z2 = 1, z3 = 2;
+  //CHECK: #pragma omp parallel loop collapse(2) private(z) lastprivate(j) order(concurrent) firstprivate(z2) num_threads(4) if(1) allocate(omp_default_mem_alloc: z2) shared(z3) reduction(+: z1) bind(parallel) proc_bind(primary)
+  #pragma omp parallel loop collapse(2) private(z) lastprivate(j)          \
+                   order(concurrent) firstprivate(z2) num_threads(4) if(1) \
+                   allocate(omp_default_mem_alloc:z2) shared(z3)           \
+                   reduction(+:z1) bind(parallel) proc_bind(primary)
+  for (auto i = 0; i < N; ++i) {
+    for (j = 0; j < N; ++j) {
+      z = i+j;
+      MTX[i][j] = z;
+      z1 += z;
+    }
+  }
+
+  //CHECK: #pragma omp target teams
+  //CHECK: #pragma omp parallel loop bind(teams)
+  #pragma omp target teams
+  #pragma omp parallel loop bind(teams)
+  for (auto i = 0; i < N; ++i) { }
+
+  //CHECK: #pragma omp target
+  //CHECK: #pragma omp teams
+  //CHECK: #pragma omp parallel loop bind(teams)
+  #pragma omp target
+  #pragma omp teams
+  #pragma omp parallel loop bind(teams)
+  for (auto i = 0; i < N; ++i) { }
+}
+
+//CHECK: void nobindingfunc() {
+void nobindingfunc()
+{
+  //CHECK: #pragma omp parallel loop
+  #pragma omp parallel loop
+  for (int i=0; i<10; ++i) { }
+}
+
+void bar()
+{
+  templ_foo<int,2>(8);
+}
+
+#endif // HEADER

diff  --git a/clang/test/OpenMP/parallel_generic_loop_messages.cpp b/clang/test/OpenMP/parallel_generic_loop_messages.cpp
new file mode 100644
index 0000000000000..dd55445d2f501
--- /dev/null
+++ b/clang/test/OpenMP/parallel_generic_loop_messages.cpp
@@ -0,0 +1,158 @@
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -verify -fopenmp \
+// RUN:  -fopenmp-version=51 -Wuninitialized %s
+
+void foo()
+{
+  int i,j,k;
+  int z;
+
+  // expected-error at +2 {{statement after '#pragma omp parallel loop' must be a for loop}}
+  #pragma omp parallel loop bind(thread)
+  i = 0;
+
+  // OpenMP 5.1 [2.22 Nesting of regions]
+  //
+  // A barrier region may not be closely nested inside a worksharing, loop,
+  // task, taskloop, critical, ordered, atomic, or masked region.
+
+  // expected-error at +3 {{region cannot be closely nested inside 'parallel loop' region}}
+  #pragma omp parallel loop bind(thread)
+  for (i=0; i<1000; ++i) {
+    #pragma omp barrier
+  }
+
+  // A masked region may not be closely nested inside a worksharing, loop,
+  // atomic, task, or taskloop region.
+
+  // expected-error at +3 {{region cannot be closely nested inside 'parallel loop' region}}
+  #pragma omp parallel loop bind(thread)
+  for (i=0; i<1000; ++i) {
+    #pragma omp masked filter(2)
+    { }
+  }
+
+  // An ordered region that corresponds to an ordered construct without any
+  // clause or with the threads or depend clause may not be closely nested
+  // inside a critical, ordered, loop, atomic, task, or taskloop region.
+
+  // expected-error at +3 {{region cannot be closely nested inside 'parallel loop' region; perhaps you forget to enclose 'omp ordered' directive into a for or a parallel for region with 'ordered' clause?}}
+  #pragma omp parallel loop bind(thread)
+  for (i=0; i<1000; ++i) {
+    #pragma omp ordered
+    { }
+  }
+
+  // expected-error at +3 {{region cannot be closely nested inside 'parallel loop' region; perhaps you forget to enclose 'omp ordered' directive into a for or a parallel for region with 'ordered' clause?}}
+  #pragma omp parallel loop bind(thread)
+  for (i=0; i<1000; ++i) {
+    #pragma omp ordered threads
+    { }
+  }
+
+  // expected-error at +3 {{region cannot be closely nested inside 'parallel loop' region; perhaps you forget to enclose 'omp ordered' directive into a for or a parallel for region with 'ordered' clause?}}
+  #pragma omp parallel loop bind(thread)
+  for (i=0; i<1000; ++i) {
+    #pragma omp ordered depend(source)
+  }
+
+  // bind clause
+
+  // expected-error at +1 {{directive '#pragma omp parallel loop' cannot contain more than one 'bind' clause}}
+  #pragma omp parallel loop bind(thread) bind(thread)
+  for (i=0; i<1000; ++i) {
+  }
+
+  // expected-error at +1 {{expected 'teams', 'parallel' or 'thread' in OpenMP clause 'bind'}}
+  #pragma omp parallel loop bind(other)
+  for (i=0; i<1000; ++i) {
+  }
+
+  // collapse clause
+
+  // expected-error at +4 {{expected 2 for loops after '#pragma omp parallel loop', but found only 1}}
+  // expected-note at +1 {{as specified in 'collapse' clause}}
+  #pragma omp parallel loop collapse(2) bind(thread)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // expected-error at +1 {{directive '#pragma omp parallel loop' cannot contain more than one 'collapse' clause}}
+  #pragma omp parallel loop collapse(2) collapse(2) bind(thread)
+  for (i=0; i<1000; ++i)
+    for (j=0; j<1000; ++j)
+      z = i+j+11;
+
+  // order clause
+
+  // expected-error at +1 {{expected 'concurrent' in OpenMP clause 'order'}}
+  #pragma omp parallel loop order(foo) bind(thread)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // private clause
+
+  // expected-error at +1 {{use of undeclared identifier 'undef_var'}}
+  #pragma omp parallel loop private(undef_var) bind(thread)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // lastprivate
+
+  // A list item may not appear in a lastprivate clause unless it is the loop
+  // iteration variable of a loop that is associated with the construct.
+
+  // expected-error at +1 {{only loop iteration variables are allowed in 'lastprivate' clause in 'omp parallel loop' directives}}
+  #pragma omp parallel loop lastprivate(z) bind(thread)
+  for (i=0; i<1000; ++i) {
+    z = i+11;
+  }
+
+  // expected-error at +1 {{only loop iteration variables are allowed in 'lastprivate' clause in 'omp parallel loop' directives}}
+  #pragma omp parallel loop lastprivate(k) collapse(2) bind(thread)
+  for (i=0; i<1000; ++i)
+    for (j=0; j<1000; ++j)
+      for (k=0; k<1000; ++k)
+        z = i+j+k+11;
+
+  // reduction
+
+  // expected-error at +1 {{use of undeclared identifier 'undef_var'}}
+  #pragma omp parallel loop reduction(+:undef_var) bind(thread)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // num_threads
+
+  // expected-error at +1 {{directive '#pragma omp parallel loop' cannot contain more than one 'num_threads' clause}}
+  #pragma omp parallel loop num_threads(4) num_threads(4)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // proc_bind
+
+  // expected-error at +1 {{directive '#pragma omp parallel loop' cannot contain more than one 'proc_bind' clause}}
+  #pragma omp parallel loop proc_bind(close) proc_bind(primary)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+}
+
+template <typename T, int C>
+void templ_test(T t) {
+  T i,z;
+
+  // expected-error at +4 {{expected 2 for loops after '#pragma omp parallel loop', but found only 1}}
+  // expected-note at +1 {{as specified in 'collapse' clause}}
+  #pragma omp parallel loop collapse(C) bind(thread)
+  for (i=0; i<1000; ++i)
+    z = i+11;
+
+  // expected-error at +1 {{only loop iteration variables are allowed in 'lastprivate' clause in 'omp parallel loop' directives}}
+  #pragma omp parallel loop lastprivate(z) bind(thread)
+  for (i=0; i<1000; ++i) {
+    z = i+11;
+  }
+}
+
+void bar()
+{
+  templ_test<int, 2>(16); // expected-note {{in instantiation of function template specialization 'templ_test<int, 2>' requested here}}
+}

diff  --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index b2e4557c4a1ed..54f461e104bb8 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -5730,6 +5730,8 @@ CXString clang_getCursorKindSpelling(enum CXCursorKind Kind) {
     return cxstring::createRef("OMPTeamsGenericLoopDirective");
   case CXCursor_OMPTargetTeamsGenericLoopDirective:
     return cxstring::createRef("OMPTargetTeamsGenericLoopDirective");
+  case CXCursor_OMPParallelGenericLoopDirective:
+    return cxstring::createRef("OMPParallelGenericLoopDirective");
   case CXCursor_OverloadCandidate:
     return cxstring::createRef("OverloadCandidate");
   case CXCursor_TypeAliasTemplateDecl:

diff  --git a/clang/tools/libclang/CXCursor.cpp b/clang/tools/libclang/CXCursor.cpp
index 1bc79765e64dd..bbd155e060dc9 100644
--- a/clang/tools/libclang/CXCursor.cpp
+++ b/clang/tools/libclang/CXCursor.cpp
@@ -832,6 +832,9 @@ CXCursor cxcursor::MakeCXCursor(const Stmt *S, const Decl *Parent,
   case Stmt::OMPTargetTeamsGenericLoopDirectiveClass:
     K = CXCursor_OMPTargetTeamsGenericLoopDirective;
     break;
+  case Stmt::OMPParallelGenericLoopDirectiveClass:
+    K = CXCursor_OMPParallelGenericLoopDirective;
+    break;
   case Stmt::BuiltinBitCastExprClass:
     K = CXCursor_BuiltinBitCastExpr;
   }

diff  --git a/llvm/include/llvm/Frontend/OpenMP/OMP.td b/llvm/include/llvm/Frontend/OpenMP/OMP.td
index cbe97c866f5b6..d8ccaede74b34 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ b/llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -1808,6 +1808,26 @@ def OMP_target_teams_loop : Directive<"target teams loop"> {
     VersionedClause<OMPC_ThreadLimit>,
   ];
 }
+def OMP_parallel_loop : Directive<"parallel loop"> {
+  let allowedClauses = [
+    VersionedClause<OMPC_Allocate>,
+    VersionedClause<OMPC_Copyin>,
+    VersionedClause<OMPC_FirstPrivate>,
+    VersionedClause<OMPC_LastPrivate>,
+    VersionedClause<OMPC_Private>,
+    VersionedClause<OMPC_Reduction>,
+    VersionedClause<OMPC_Shared>,
+  ];
+  let allowedOnceClauses = [
+    VersionedClause<OMPC_Bind, 50>,
+    VersionedClause<OMPC_Collapse>,
+    VersionedClause<OMPC_Default>,
+    VersionedClause<OMPC_If>,
+    VersionedClause<OMPC_NumThreads>,
+    VersionedClause<OMPC_Order>,
+    VersionedClause<OMPC_ProcBind>,
+  ];
+}
 def OMP_Metadirective : Directive<"metadirective"> {
   let allowedClauses = [VersionedClause<OMPC_When>];
   let allowedOnceClauses = [VersionedClause<OMPC_Default>];


        


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