[lldb] [clang] [llvm] [clang-tools-extra] [compiler-rt] [mlir] [libc] [flang] [OpenMP] atomic compare weak : Parser & AST support (PR #79475)

via llvm-commits llvm-commits at lists.llvm.org
Sun Jan 28 07:28:01 PST 2024


https://github.com/SunilKuravinakop updated https://github.com/llvm/llvm-project/pull/79475

>From 6614e517cf0888b4502efc0af974d1612fa7a822 Mon Sep 17 00:00:00 2001
From: Sunil Kuravinakop <kuravina at pe28vega.us.cray.com>
Date: Thu, 25 Jan 2024 10:37:20 -0600
Subject: [PATCH 1/2] Changes to Support Parsing & Sema of atomic compare weak.

  Changes to be committed:
 	modified:   clang/include/clang/AST/OpenMPClause.h
 	modified:   clang/include/clang/AST/RecursiveASTVisitor.h
 	modified:   clang/include/clang/Basic/DiagnosticSemaKinds.td
 	modified:   clang/include/clang/Sema/Sema.h
 	modified:   clang/lib/AST/OpenMPClause.cpp
 	modified:   clang/lib/AST/StmtProfile.cpp
 	modified:   clang/lib/CodeGen/CGStmtOpenMP.cpp
 	modified:   clang/lib/Parse/ParseOpenMP.cpp
 	modified:   clang/lib/Sema/SemaOpenMP.cpp
 	modified:   clang/lib/Sema/TreeTransform.h
 	modified:   clang/lib/Serialization/ASTReader.cpp
 	modified:   clang/lib/Serialization/ASTWriter.cpp
 	modified:   clang/test/OpenMP/atomic_ast_print.cpp
 	modified:   clang/test/OpenMP/atomic_messages.cpp
 	modified:   clang/tools/libclang/CIndex.cpp
 	modified:   llvm/include/llvm/Frontend/OpenMP/OMP.td
---
 clang/include/clang/AST/OpenMPClause.h        | 40 +++++++++++++++++++
 clang/include/clang/AST/RecursiveASTVisitor.h |  5 +++
 .../clang/Basic/DiagnosticSemaKinds.td        |  3 +-
 clang/include/clang/Sema/Sema.h               |  3 ++
 clang/lib/AST/OpenMPClause.cpp                |  2 +
 clang/lib/AST/StmtProfile.cpp                 |  2 +
 clang/lib/CodeGen/CGStmtOpenMP.cpp            |  3 ++
 clang/lib/Parse/ParseOpenMP.cpp               |  1 +
 clang/lib/Sema/SemaOpenMP.cpp                 | 35 +++++++++++++++-
 clang/lib/Sema/TreeTransform.h                |  6 +++
 clang/lib/Serialization/ASTReader.cpp         |  5 +++
 clang/lib/Serialization/ASTWriter.cpp         |  2 +
 clang/test/OpenMP/atomic_ast_print.cpp        |  8 ++++
 clang/test/OpenMP/atomic_messages.cpp         | 11 +++++
 clang/tools/libclang/CIndex.cpp               |  2 +
 llvm/include/llvm/Frontend/OpenMP/OMP.td      |  4 +-
 16 files changed, 129 insertions(+), 3 deletions(-)

diff --git a/clang/include/clang/AST/OpenMPClause.h b/clang/include/clang/AST/OpenMPClause.h
index 924ca189381ba8..325a1baa446142 100644
--- a/clang/include/clang/AST/OpenMPClause.h
+++ b/clang/include/clang/AST/OpenMPClause.h
@@ -2513,6 +2513,46 @@ class OMPRelaxedClause final : public OMPClause {
   }
 };
 
+/// This represents 'weak' clause in the '#pragma omp atomic'
+/// directives.
+///
+/// \code
+/// #pragma omp atomic compare weak
+/// \endcode
+/// In this example directive '#pragma omp atomic' has 'weak' clause.
+class OMPWeakClause final : public OMPClause {
+public:
+  /// Build 'weak' clause.
+  ///
+  /// \param StartLoc Starting location of the clause.
+  /// \param EndLoc Ending location of the clause.
+  OMPWeakClause(SourceLocation StartLoc, SourceLocation EndLoc)
+      : OMPClause(llvm::omp::OMPC_weak, StartLoc, EndLoc) {}
+
+  /// Build an empty clause.
+  OMPWeakClause()
+      : OMPClause(llvm::omp::OMPC_weak, SourceLocation(), SourceLocation()) {}
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+
+  child_range used_children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range used_children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+
+  static bool classof(const OMPClause *T) {
+    return T->getClauseKind() == llvm::omp::OMPC_weak;
+  }
+};
+
 /// This represents 'fail' clause in the '#pragma omp atomic'
 /// directive.
 ///
diff --git a/clang/include/clang/AST/RecursiveASTVisitor.h b/clang/include/clang/AST/RecursiveASTVisitor.h
index 8f2714e142bbe3..0fbf3e30e2d8d6 100644
--- a/clang/include/clang/AST/RecursiveASTVisitor.h
+++ b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -3423,6 +3423,11 @@ bool RecursiveASTVisitor<Derived>::VisitOMPRelaxedClause(OMPRelaxedClause *) {
   return true;
 }
 
+template <typename Derived>
+bool RecursiveASTVisitor<Derived>::VisitOMPWeakClause(OMPWeakClause *) {
+  return true;
+}
+
 template <typename Derived>
 bool RecursiveASTVisitor<Derived>::VisitOMPThreadsClause(OMPThreadsClause *) {
   return true;
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index a97182cad5d513..42fa19e0424fbb 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -10996,7 +10996,8 @@ def note_omp_atomic_compare: Note<
   "expect lvalue for result value|expect scalar value|expect integer value|unexpected 'else' statement|expect '==' operator|expect an assignment statement 'v = x'|"
   "expect a 'if' statement|expect no more than two statements|expect a compound statement|expect 'else' statement|expect a form 'r = x == e; if (r) ...'}0">;
 def err_omp_atomic_fail_wrong_or_no_clauses : Error<"expected a memory order clause">;
-def err_omp_atomic_fail_no_compare : Error<"expected 'compare' clause with the 'fail' modifier">;
+def err_omp_atomic_no_compare : Error<"expected 'compare' clause with the '%0' modifier">;
+def err_omp_atomic_weak_no_equality : Error<"expected '==' operator for 'weak' clause">; 
 def err_omp_atomic_several_clauses : Error<
   "directive '#pragma omp atomic' cannot contain more than one 'read', 'write', 'update', 'capture', or 'compare' clause">;
 def err_omp_several_mem_order_clauses : Error<
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 8f44adef38159e..a46026cff6ade3 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -12243,6 +12243,9 @@ class Sema final {
   /// Called on well-formed 'relaxed' clause.
   OMPClause *ActOnOpenMPRelaxedClause(SourceLocation StartLoc,
                                       SourceLocation EndLoc);
+  /// Called on well-formed 'weak' clause.
+  OMPClause *ActOnOpenMPWeakClause(SourceLocation StartLoc,
+                                   SourceLocation EndLoc);
 
   /// Called on well-formed 'init' clause.
   OMPClause *
diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index 04f680a8f5c92c..042a5df5906caa 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -1957,6 +1957,8 @@ void OMPClausePrinter::VisitOMPRelaxedClause(OMPRelaxedClause *) {
   OS << "relaxed";
 }
 
+void OMPClausePrinter::VisitOMPWeakClause(OMPWeakClause *) { OS << "weak"; }
+
 void OMPClausePrinter::VisitOMPThreadsClause(OMPThreadsClause *) {
   OS << "threads";
 }
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index d7b980a585702a..0b933597f136bc 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -594,6 +594,8 @@ void OMPClauseProfiler::VisitOMPReleaseClause(const OMPReleaseClause *) {}
 
 void OMPClauseProfiler::VisitOMPRelaxedClause(const OMPRelaxedClause *) {}
 
+void OMPClauseProfiler::VisitOMPWeakClause(const OMPWeakClause *) {}
+
 void OMPClauseProfiler::VisitOMPThreadsClause(const OMPThreadsClause *) {}
 
 void OMPClauseProfiler::VisitOMPSIMDClause(const OMPSIMDClause *) {}
diff --git a/clang/lib/CodeGen/CGStmtOpenMP.cpp b/clang/lib/CodeGen/CGStmtOpenMP.cpp
index e362c9da51fe31..8fd74697de3c0f 100644
--- a/clang/lib/CodeGen/CGStmtOpenMP.cpp
+++ b/clang/lib/CodeGen/CGStmtOpenMP.cpp
@@ -6546,6 +6546,9 @@ void CodeGenFunction::EmitOMPAtomicDirective(const OMPAtomicDirective &S) {
     // Find first clause (skip seq_cst|acq_rel|aqcuire|release|relaxed clause,
     // if it is first).
     OpenMPClauseKind K = C->getClauseKind();
+    // TBD
+    if (K == OMPC_weak)
+      return;
     if (K == OMPC_seq_cst || K == OMPC_acq_rel || K == OMPC_acquire ||
         K == OMPC_release || K == OMPC_relaxed || K == OMPC_hint)
       continue;
diff --git a/clang/lib/Parse/ParseOpenMP.cpp b/clang/lib/Parse/ParseOpenMP.cpp
index da5f6605c6ffac..bfc31f2653c237 100644
--- a/clang/lib/Parse/ParseOpenMP.cpp
+++ b/clang/lib/Parse/ParseOpenMP.cpp
@@ -3314,6 +3314,7 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
   case OMPC_acquire:
   case OMPC_release:
   case OMPC_relaxed:
+  case OMPC_weak:
   case OMPC_threads:
   case OMPC_simd:
   case OMPC_nogroup:
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index f34d2959dc6191..895a27f560dec7 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -12682,9 +12682,11 @@ StmtResult Sema::ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
       }
       break;
     }
+    case OMPC_weak:
     case OMPC_fail: {
       if (!EncounteredAtomicKinds.contains(OMPC_compare)) {
-        Diag(C->getBeginLoc(), diag::err_omp_atomic_fail_no_compare)
+        Diag(C->getBeginLoc(), diag::err_omp_atomic_no_compare)
+            << getOpenMPClauseName(C->getClauseKind())
             << SourceRange(C->getBeginLoc(), C->getEndLoc());
         return StmtError();
       }
@@ -13176,6 +13178,29 @@ StmtResult Sema::ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
       E = Checker.getE();
       D = Checker.getD();
       CE = Checker.getCond();
+      /* The weak clause may only appear if the resulting atomic operation is
+       * an atomic conditional update for which the comparison tests for
+       * equality.
+       * It was not possible to do this check in
+       * OpenMPAtomicCompareChecker::checkStmt() as the check for OMPC_weak
+       * could not be performed (Clauses are not available).
+       */
+      for (OMPClause *C : Clauses) {
+        if (C->getClauseKind() == llvm::omp::Clause::OMPC_weak) {
+          auto *Cond = dyn_cast<BinaryOperator>(CE);
+          if (Cond->getOpcode() != BO_EQ) {
+
+            ErrorInfo.Error = Checker.ErrorTy::NotAnAssignment;
+            ErrorInfo.ErrorLoc = Cond->getExprLoc();
+            ErrorInfo.NoteLoc = Cond->getOperatorLoc();
+            ErrorInfo.ErrorRange = ErrorInfo.NoteRange = Cond->getSourceRange();
+
+            Diag(ErrorInfo.ErrorLoc, diag::err_omp_atomic_weak_no_equality)
+                << ErrorInfo.ErrorRange;
+            return StmtError();
+          }
+        }
+      }
       // We reuse IsXLHSInRHSPart to tell if it is in the form 'x ordop expr'.
       IsXLHSInRHSPart = Checker.isXBinopExpr();
     }
@@ -17567,6 +17592,9 @@ OMPClause *Sema::ActOnOpenMPClause(OpenMPClauseKind Kind,
   case OMPC_relaxed:
     Res = ActOnOpenMPRelaxedClause(StartLoc, EndLoc);
     break;
+  case OMPC_weak:
+    Res = ActOnOpenMPWeakClause(StartLoc, EndLoc);
+    break;
   case OMPC_threads:
     Res = ActOnOpenMPThreadsClause(StartLoc, EndLoc);
     break;
@@ -17755,6 +17783,11 @@ OMPClause *Sema::ActOnOpenMPRelaxedClause(SourceLocation StartLoc,
   return new (Context) OMPRelaxedClause(StartLoc, EndLoc);
 }
 
+OMPClause *Sema::ActOnOpenMPWeakClause(SourceLocation StartLoc,
+                                       SourceLocation EndLoc) {
+  return new (Context) OMPWeakClause(StartLoc, EndLoc);
+}
+
 OMPClause *Sema::ActOnOpenMPThreadsClause(SourceLocation StartLoc,
                                           SourceLocation EndLoc) {
   return new (Context) OMPThreadsClause(StartLoc, EndLoc);
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index c8c5a51bf9f94e..29f557dbaa8622 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -9922,6 +9922,12 @@ TreeTransform<Derived>::TransformOMPRelaxedClause(OMPRelaxedClause *C) {
   return C;
 }
 
+template <typename Derived>
+OMPClause *TreeTransform<Derived>::TransformOMPWeakClause(OMPWeakClause *C) {
+  // No need to rebuild this clause, no template-dependent parameters.
+  return C;
+}
+
 template <typename Derived>
 OMPClause *
 TreeTransform<Derived>::TransformOMPThreadsClause(OMPThreadsClause *C) {
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 9effd333daccdb..ba2257f9529c31 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -10294,6 +10294,9 @@ OMPClause *OMPClauseReader::readClause() {
   case llvm::omp::OMPC_relaxed:
     C = new (Context) OMPRelaxedClause();
     break;
+  case llvm::omp::OMPC_weak:
+    C = new (Context) OMPWeakClause();
+    break;
   case llvm::omp::OMPC_threads:
     C = new (Context) OMPThreadsClause();
     break;
@@ -10692,6 +10695,8 @@ void OMPClauseReader::VisitOMPReleaseClause(OMPReleaseClause *) {}
 
 void OMPClauseReader::VisitOMPRelaxedClause(OMPRelaxedClause *) {}
 
+void OMPClauseReader::VisitOMPWeakClause(OMPWeakClause *) {}
+
 void OMPClauseReader::VisitOMPThreadsClause(OMPThreadsClause *) {}
 
 void OMPClauseReader::VisitOMPSIMDClause(OMPSIMDClause *) {}
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 78939bfd533ffa..2a3ebb2fbb1d75 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -6646,6 +6646,8 @@ void OMPClauseWriter::VisitOMPReleaseClause(OMPReleaseClause *) {}
 
 void OMPClauseWriter::VisitOMPRelaxedClause(OMPRelaxedClause *) {}
 
+void OMPClauseWriter::VisitOMPWeakClause(OMPWeakClause *) {}
+
 void OMPClauseWriter::VisitOMPThreadsClause(OMPThreadsClause *) {}
 
 void OMPClauseWriter::VisitOMPSIMDClause(OMPSIMDClause *) {}
diff --git a/clang/test/OpenMP/atomic_ast_print.cpp b/clang/test/OpenMP/atomic_ast_print.cpp
index 6886ef29a6752d..b16a5fcdbdd3e4 100644
--- a/clang/test/OpenMP/atomic_ast_print.cpp
+++ b/clang/test/OpenMP/atomic_ast_print.cpp
@@ -232,6 +232,8 @@ T foo(T argc) {
   { if (a < c) { a = c; } }
 #pragma omp atomic compare fail(seq_cst)
   { if (a < c) { a = c; } }
+#pragma omp atomic compare seq_cst weak
+  { if(a == b) { a = c; } }
 #endif
   return T();
 }
@@ -1111,6 +1113,8 @@ int main(int argc, char **argv) {
   if(a < b) { a = b; }
 #pragma omp atomic compare fail(seq_cst)
   if(a < b) { a = b; }
+#pragma omp atomic compare seq_cst weak
+  if(a == b) { a = c; }
 #endif
   // CHECK-NEXT: #pragma omp atomic
   // CHECK-NEXT: a++;
@@ -1453,6 +1457,10 @@ int main(int argc, char **argv) {
   // CHECK-51-NEXT: if (a < b) {
   // CHECK-51-NEXT: a = b;
   // CHECK-51-NEXT: }
+  // CHECK-51-NEXT: #pragma omp atomic compare seq_cst weak
+  // CHECK-51-NEXT: if (a == b) {
+  // CHECK-51-NEXT: a = c;
+  // CHECK-51-NEXT: }
   // expect-note at +1 {{in instantiation of function template specialization 'foo<int>' requested here}}
   return foo(a);
 }
diff --git a/clang/test/OpenMP/atomic_messages.cpp b/clang/test/OpenMP/atomic_messages.cpp
index b09e3318cd9ac0..d492f6ee1e8962 100644
--- a/clang/test/OpenMP/atomic_messages.cpp
+++ b/clang/test/OpenMP/atomic_messages.cpp
@@ -974,6 +974,17 @@ int mixed() {
 // expected-error at +1 {{directive '#pragma omp atomic' cannot contain more than one 'fail' clause}}
 #pragma omp atomic compare fail(relaxed) fail(seq_cst)
   if(v < a) { v = a; }
+#pragma omp atomic compare seq_cst weak
+  if(v == a) { v = a; }
+// expected-error at +1 {{expected 'compare' clause with the 'weak' modifier}}
+#pragma omp atomic weak
+  if(v < a) { v = a; }
+#pragma omp atomic compare release weak
+// expected-error at +1 {{expected '==' operator for 'weak' clause}}
+  if(v < a) { v = a; }
+// expected-error at +1 {{directive '#pragma omp atomic' cannot contain more than one 'weak' clause}}
+#pragma omp atomic compare release weak fail(seq_cst) weak
+  if(v == a) { v = a; }
 
 
 #endif
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 841522a0f4788f..15d3b00de0a53f 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2414,6 +2414,8 @@ void OMPClauseEnqueue::VisitOMPReleaseClause(const OMPReleaseClause *) {}
 
 void OMPClauseEnqueue::VisitOMPRelaxedClause(const OMPRelaxedClause *) {}
 
+void OMPClauseEnqueue::VisitOMPWeakClause(const OMPWeakClause *) {}
+
 void OMPClauseEnqueue::VisitOMPThreadsClause(const OMPThreadsClause *) {}
 
 void OMPClauseEnqueue::VisitOMPSIMDClause(const OMPSIMDClause *) {}
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMP.td b/llvm/include/llvm/Frontend/OpenMP/OMP.td
index 2388abac81ceb4..1481328bf483b8 100644
--- a/llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ b/llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -215,6 +215,7 @@ def OMPC_AcqRel : Clause<"acq_rel"> { let clangClass = "OMPAcqRelClause"; }
 def OMPC_Acquire : Clause<"acquire"> { let clangClass = "OMPAcquireClause"; }
 def OMPC_Release : Clause<"release"> { let clangClass = "OMPReleaseClause"; }
 def OMPC_Relaxed : Clause<"relaxed"> { let clangClass = "OMPRelaxedClause"; }
+def OMPC_Weak : Clause<"weak"> { let clangClass = "OMPWeakClause"; }
 def OMPC_Depend : Clause<"depend"> {
   let clangClass = "OMPDependClause";
   let flangClass = "OmpDependClause";
@@ -642,7 +643,8 @@ def OMP_Atomic : Directive<"atomic"> {
     VersionedClause<OMPC_Release, 50>,
     VersionedClause<OMPC_Relaxed, 50>,
     VersionedClause<OMPC_Hint, 50>,
-    VersionedClause<OMPC_Fail, 51>
+    VersionedClause<OMPC_Fail, 51>,
+    VersionedClause<OMPC_Weak, 51>
   ];
 }
 def OMP_Target : Directive<"target"> {

>From d0ed3c729766baa0bea7cca1a82e6d03980be828 Mon Sep 17 00:00:00 2001
From: Sunil Kuravinakop <kuravina at pe28vega.us.cray.com>
Date: Sat, 27 Jan 2024 05:09:44 -0600
Subject: [PATCH 2/2] Changes done: 1) C++ style comments. 2) Code changed to
 use find_if() algorithms of C++ Standard Library.

  Changes to be committed:
 	modified:   clang/lib/Sema/SemaOpenMP.cpp
---
 clang/lib/Sema/SemaOpenMP.cpp | 40 +++++++++++++++++------------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index b632e4ef8a8c0b..c4e6cafee47a19 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -13204,27 +13204,25 @@ StmtResult Sema::ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
       E = Checker.getE();
       D = Checker.getD();
       CE = Checker.getCond();
-      /* The weak clause may only appear if the resulting atomic operation is
-       * an atomic conditional update for which the comparison tests for
-       * equality.
-       * It was not possible to do this check in
-       * OpenMPAtomicCompareChecker::checkStmt() as the check for OMPC_weak
-       * could not be performed (Clauses are not available).
-       */
-      for (OMPClause *C : Clauses) {
-        if (C->getClauseKind() == llvm::omp::Clause::OMPC_weak) {
-          auto *Cond = dyn_cast<BinaryOperator>(CE);
-          if (Cond->getOpcode() != BO_EQ) {
-
-            ErrorInfo.Error = Checker.ErrorTy::NotAnAssignment;
-            ErrorInfo.ErrorLoc = Cond->getExprLoc();
-            ErrorInfo.NoteLoc = Cond->getOperatorLoc();
-            ErrorInfo.ErrorRange = ErrorInfo.NoteRange = Cond->getSourceRange();
-
-            Diag(ErrorInfo.ErrorLoc, diag::err_omp_atomic_weak_no_equality)
-                << ErrorInfo.ErrorRange;
-            return StmtError();
-          }
+      // The weak clause may only appear if the resulting atomic operation is
+      // an atomic conditional update for which the comparison tests for
+      // equality. It was not possible to do this check in
+      // OpenMPAtomicCompareChecker::checkStmt() as the check for OMPC_weak
+      // could not be performed (Clauses are not available).
+      auto *It = find_if(Clauses, [](OMPClause *C) {
+        return C->getClauseKind() == llvm::omp::Clause::OMPC_weak;
+      });
+      if (It != Clauses.end()) {
+        auto *Cond = dyn_cast<BinaryOperator>(CE);
+        if (Cond->getOpcode() != BO_EQ) {
+          ErrorInfo.Error = Checker.ErrorTy::NotAnAssignment;
+          ErrorInfo.ErrorLoc = Cond->getExprLoc();
+          ErrorInfo.NoteLoc = Cond->getOperatorLoc();
+          ErrorInfo.ErrorRange = ErrorInfo.NoteRange = Cond->getSourceRange();
+
+          Diag(ErrorInfo.ErrorLoc, diag::err_omp_atomic_weak_no_equality)
+              << ErrorInfo.ErrorRange;
+          return StmtError();
         }
       }
       // We reuse IsXLHSInRHSPart to tell if it is in the form 'x ordop expr'.



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