[OPENMP] Allow to use global variables as lcv in loop-based directives.

[ABataev]

Summary

For proper codegen we need to capture variable in the OpenMP region. In loop-based directives loop control variables are private by default and they must be captured in this region. There was a problem with capturing of globals, used as lcv, as they was not marked as private by default.

[rsmith]

include/clang/Sema/Sema.h

7427

Grammar error around "if it so"

7428

Use \p, not \a, for references to function parameters.

lib/Sema/SemaOpenMP.cpp

2476–2482

Please just pass a flag into CheckInit to tell it not to produce diagnostics rather than disabling the diagnostics engine.

include/clang/Basic/DiagnosticSemaKinds.td

def note_omp_predetermined_dsa : Note<
   "global variable is predetermined as shared|"
   "non-shared variable in a task construct is predetermined as firstprivate|"
   "variable with automatic storage duration is predetermined as private}0"
   "%select{|; perhaps you forget to enclose 'omp %2' directive into a parallel or another task region?}1">;
 def note_omp_implicit_dsa : Note<
   "implicitly determined as %0">;
 def err_omp_loop_var_dsa : Error<
   "loop iteration variable in the associated loop of 'omp %1' directive may not be %0, predetermined as %2">;
-def err_omp_global_loop_var_dsa : Error<
-  "loop iteration variable in the associated loop of 'omp %1' directive may not be a variable with global storage without being explicitly marked as %0">;
 def err_omp_not_for : Error<
   "%select{statement after '#pragma omp %1' must be a for loop|"
   "expected %2 for loops after '#pragma omp %1'%select{|, but found only %4}3}0">;
 def note_omp_collapse_expr : Note<
   "as specified in 'collapse' clause">;
 def err_omp_negative_expression_in_clause : Error<
   "argument to '%0' clause must be a positive integer value">;
 def err_omp_not_integral : Error<

include/clang/Sema/Sema.h

ExprResult PerformOpenMPImplicitIntegerConversion(SourceLocation OpLoc,
                                                     Expr *Op);
   /// \brief Called on start of new data sharing attribute block.
   void StartOpenMPDSABlock(OpenMPDirectiveKind K,
                            const DeclarationNameInfo &DirName, Scope *CurScope,
                            SourceLocation Loc);
   /// \brief Called on end of data sharing attribute block.
   void EndOpenMPDSABlock(Stmt *CurDirective);
 
+  /// \brief Checks if the current region is an OpenMP loop region and if it so,
+  /// marks loop control variable, used in \a Init for loop initialization, as
+  /// private by default.
+  /// \param Init First part of the for loop.
+  void ActOnOpenMPLoopInitialization(SourceLocation ForLoc, Stmt *Init);
+
   // OpenMP directives and clauses.
   /// \brief Called on correct id-expression from the '#pragma omp
   /// threadprivate'.
   ExprResult ActOnOpenMPIdExpression(Scope *CurScope,
                                      CXXScopeSpec &ScopeSpec,
                                      const DeclarationNameInfo &Id);
   /// \brief Called on well-formed '#pragma omp threadprivate'.
   DeclGroupPtrTy ActOnOpenMPThreadprivateDirective(

lib/Parse/ParseStmt.cpp

StmtResult Parser::ParseForStatement(SourceLocation *TrailingElseLoc) {
 
   // Similarly, we need to do the semantic analysis for a for-range
   // statement immediately in order to close over temporaries correctly.
   } else if (ForEach) {
     ForEachStmt = Actions.ActOnObjCForCollectionStmt(ForLoc,
                                                      FirstPart.get(),
                                                      Collection.get(),
                                                      T.getCloseLocation());
+  } else {
+    // In OpenMP loop region loop control variable must be captured and be
+    // private. Perform analysis of first part (if any).
+    if (getLangOpts().OpenMP && FirstPart.isUsable()) {
+      Actions.ActOnOpenMPLoopInitialization(ForLoc, FirstPart.get());
+    }
   }
 
   // C99 6.8.5p5 - In C99, the body of the for statement is a scope, even if
   // there is no compound stmt.  C90 does not have this clause.  We only do this
   // if the body isn't a compound statement to avoid push/pop in common cases.
   //
   // C++ 6.5p2:
   // The substatement in an iteration-statement implicitly defines a local scope

lib/Sema/SemaOpenMP.cpp

 
 private:
   struct DSAInfo {
     OpenMPClauseKind Attributes;
     DeclRefExpr *RefExpr;
   };
   typedef llvm::SmallDenseMap<VarDecl *, DSAInfo, 64> DeclSAMapTy;
   typedef llvm::SmallDenseMap<VarDecl *, DeclRefExpr *, 64> AlignedMapTy;
+  typedef llvm::DenseSet<VarDecl *> LoopControlVariablesSetTy;
 
   struct SharingMapTy {
     DeclSAMapTy SharingMap;
     AlignedMapTy AlignedMap;
+    LoopControlVariablesSetTy LCVSet;
     DefaultDataSharingAttributes DefaultAttr;
     SourceLocation DefaultAttrLoc;
     OpenMPDirectiveKind Directive;
     DeclarationNameInfo DirectiveName;
     Scope *CurScope;
     SourceLocation ConstructLoc;
     bool OrderedRegion;
+    unsigned CollapseNumber;
     SourceLocation InnerTeamsRegionLoc;
     SharingMapTy(OpenMPDirectiveKind DKind, DeclarationNameInfo Name,
                  Scope *CurScope, SourceLocation Loc)
-        : SharingMap(), AlignedMap(), DefaultAttr(DSA_unspecified),
+        : SharingMap(), AlignedMap(), LCVSet(), DefaultAttr(DSA_unspecified),
           Directive(DKind), DirectiveName(std::move(Name)), CurScope(CurScope),
-          ConstructLoc(Loc), OrderedRegion(false), InnerTeamsRegionLoc() {}
+          ConstructLoc(Loc), OrderedRegion(false), CollapseNumber(1),
+          InnerTeamsRegionLoc() {}
     SharingMapTy()
-        : SharingMap(), AlignedMap(), DefaultAttr(DSA_unspecified),
+        : SharingMap(), AlignedMap(), LCVSet(), DefaultAttr(DSA_unspecified),
           Directive(OMPD_unknown), DirectiveName(), CurScope(nullptr),
-          ConstructLoc(), OrderedRegion(false), InnerTeamsRegionLoc() {}
+          ConstructLoc(), OrderedRegion(false), CollapseNumber(1),
+          InnerTeamsRegionLoc() {}
   };
 
   typedef SmallVector<SharingMapTy, 64> StackTy;
 
   /// \brief Stack of used declaration and their data-sharing attributes.
   StackTy Stack;
   Sema &SemaRef;
 
void pop() {
     Stack.pop_back();
   }
 
   /// \brief If 'aligned' declaration for given variable \a D was not seen yet,
   /// add it and return NULL; otherwise return previous occurrence's expression
   /// for diagnostics.
   DeclRefExpr *addUniqueAligned(VarDecl *D, DeclRefExpr *NewDE);
 
+  /// \brief Register specified variable as loop control variable.
+  void addLoopControlVariable(VarDecl *D);
+  /// \brief Check if the specified variable is a loop control variable for
+  /// current region.
+  bool isLoopControlVariable(VarDecl *D);
+
   /// \brief Adds explicit data sharing attribute to the specified declaration.
   void addDSA(VarDecl *D, DeclRefExpr *E, OpenMPClauseKind A);
 
   /// \brief Returns data sharing attributes from top of the stack for the
   /// specified declaration.
   DSAVarData getTopDSA(VarDecl *D, bool FromParent);
   /// \brief Returns data-sharing attributes for the specified declaration.
   DSAVarData getImplicitDSA(VarDecl *D, bool FromParent);
public:
   /// \brief Returns true, if parent region is ordered (has associated
   /// 'ordered' clause), false - otherwise.
   bool isParentOrderedRegion() const {
     if (Stack.size() > 2)
       return Stack[Stack.size() - 2].OrderedRegion;
     return false;
   }
 
+  /// \brief Set collapse value for the region.
+  void setCollapseNumber(unsigned Val) { Stack.back().CollapseNumber = Val; }
+  /// \brief Return collapse value for region.
+  unsigned getCollapseNumber() const {
+    return Stack.back().CollapseNumber;
+  }
+
   /// \brief Marks current target region as one with closely nested teams
   /// region.
   void setParentTeamsRegionLoc(SourceLocation TeamsRegionLoc) {
     if (Stack.size() > 2)
       Stack[Stack.size() - 2].InnerTeamsRegionLoc = TeamsRegionLoc;
   }
   /// \brief Returns true, if current region has closely nested teams region.
   bool hasInnerTeamsRegion() const {
if (It == Stack.back().AlignedMap.end()) {
     return nullptr;
   } else {
     assert(It->second && "Unexpected nullptr expr in the aligned map");
     return It->second;
   }
   return nullptr;
 }
 
+void DSAStackTy::addLoopControlVariable(VarDecl *D) {
+  assert(Stack.size() > 1 && "Data-sharing attributes stack is empty");
+  D = D->getCanonicalDecl();
+  Stack.back().LCVSet.insert(D);
+}
+
+bool DSAStackTy::isLoopControlVariable(VarDecl *D) {
+  assert(Stack.size() > 1 && "Data-sharing attributes stack is empty");
+  D = D->getCanonicalDecl();
+  return Stack.back().LCVSet.count(D) > 0;
+}
+
 void DSAStackTy::addDSA(VarDecl *D, DeclRefExpr *E, OpenMPClauseKind A) {
   D = D->getCanonicalDecl();
   if (A == OMPC_threadprivate) {
     Stack[0].SharingMap[D].Attributes = A;
     Stack[0].SharingMap[D].RefExpr = E;
   } else {
     assert(Stack.size() > 1 && "Data-sharing attributes stack is empty");
     Stack.back().SharingMap[D].Attributes = A;

 }
 
 #define DSAStack static_cast<DSAStackTy *>(VarDataSharingAttributesStack)
 
 bool Sema::IsOpenMPCapturedVar(VarDecl *VD) {
   assert(LangOpts.OpenMP && "OpenMP is not allowed");
   VD = VD->getCanonicalDecl();
   if (DSAStack->getCurrentDirective() != OMPD_unknown) {
+    if (DSAStack->isLoopControlVariable(VD))
+      return true;
     auto DVarPrivate = DSAStack->getTopDSA(VD, /*FromParent=*/false);
     if (DVarPrivate.CKind != OMPC_unknown && isOpenMPPrivate(DVarPrivate.CKind))
       return true;
     DVarPrivate = DSAStack->hasDSA(VD, isOpenMPPrivate, MatchesAlways(),
                                    /*FromParent=*/false);
     return DVarPrivate.CKind != OMPC_unknown;
   }
   return false;
Expr *OpenMPIterationSpaceChecker::BuildPreCond(Scope *S, Expr *Cond) const {
   SemaRef.getDiagnostics().setSuppressAllDiagnostics(Suppress);
   // Otherwise use original loop conditon and evaluate it in runtime.
   return CondExpr.isUsable() ? CondExpr.get() : Cond;
 }
 
 /// \brief Build reference expression to the counter be used for codegen.
 Expr *OpenMPIterationSpaceChecker::BuildCounterVar() const {
   return DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(),
-                             GetIncrementSrcRange().getBegin(), Var, false,
+                             GetIncrementSrcRange().getBegin(), Var,
+                             /*RefersToEnclosingVariableOrCapture=*/true,
                              DefaultLoc, Var->getType(), VK_LValue);
 }
 
 /// \brief Build initization of the counter be used for codegen.
 Expr *OpenMPIterationSpaceChecker::BuildCounterInit() const { return LB; }
 
 /// \brief Build step of the counter be used for codegen.
 Expr *OpenMPIterationSpaceChecker::BuildCounterStep() const { return Step; }
struct LoopIterationSpace {
   /// \brief Source range of the loop condition.
   SourceRange CondSrcRange;
   /// \brief Source range of the loop increment.
   SourceRange IncSrcRange;
 };
 
 } // namespace
 
+void Sema::ActOnOpenMPLoopInitialization(SourceLocation ForLoc, Stmt *Init) {
+  assert(getLangOpts().OpenMP && "OpenMP is not active.");
+  assert(Init && "Expected loop in canonical form.");
+  unsigned CollapseIteration = DSAStack->getCollapseNumber();
+  if (CollapseIteration > 0 &&
+      isOpenMPLoopDirective(DSAStack->getCurrentDirective())) {
+    bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
+    getDiagnostics().setSuppressAllDiagnostics(/*Val=*/true);
+    OpenMPIterationSpaceChecker ISC(*this, ForLoc);
+    if (!ISC.CheckInit(Init)) {
+      DSAStack->addLoopControlVariable(ISC.GetLoopVar());
+    }
+    getDiagnostics().setSuppressAllDiagnostics(Suppress);
+    DSAStack->setCollapseNumber(CollapseIteration - 1);
+  }
+}
+
 /// \brief Called on a for stmt to check and extract its iteration space
 /// for further processing (such as collapsing).
 static bool CheckOpenMPIterationSpace(
     OpenMPDirectiveKind DKind, Stmt *S, Sema &SemaRef, DSAStackTy &DSA,
     unsigned CurrentNestedLoopCount, unsigned NestedLoopCount,
     Expr *NestedLoopCountExpr,
     llvm::DenseMap<VarDecl *, Expr *> &VarsWithImplicitDSA,
     LoopIterationSpace &ResultIterSpace) {
SemaRef.Diag(Init->getLocStart(), diag::err_omp_loop_var_dsa)
         << getOpenMPClauseName(DVar.CKind) << getOpenMPDirectiveName(DKind)
         << getOpenMPClauseName(PredeterminedCKind);
     ReportOriginalDSA(SemaRef, &DSA, Var, DVar, true);
     HasErrors = true;
   } else if (LoopVarRefExpr != nullptr) {
     // Make the loop iteration variable private (for worksharing constructs),
     // linear (for simd directives with the only one associated loop) or
     // lastprivate (for simd directives with several collapsed loops).
-    // FIXME: the next check and error message must be removed once the
-    // capturing of global variables in loops is fixed.
     if (DVar.CKind == OMPC_unknown)
       DVar = DSA.hasDSA(Var, isOpenMPPrivate, MatchesAlways(),
                         /*FromParent=*/false);
-    if (!Var->hasLocalStorage() && DVar.CKind == OMPC_unknown) {
-      SemaRef.Diag(Init->getLocStart(), diag::err_omp_global_loop_var_dsa)
-          << getOpenMPClauseName(PredeterminedCKind)
-          << getOpenMPDirectiveName(DKind);
-      HasErrors = true;
-    } else
-      DSA.addDSA(Var, LoopVarRefExpr, PredeterminedCKind);
   }
 
   assert(isOpenMPLoopDirective(DKind) && "DSA for non-loop vars");
 
   // Check test-expr.
   HasErrors |= ISC.CheckCond(For->getCond());
 
   // Check incr-expr.
Diag(E->getExprLoc(), diag::err_omp_negative_expression_in_clause)
         << getOpenMPClauseName(CKind) << E->getSourceRange();
     return ExprError();
   }
   if (CKind == OMPC_aligned && !Result.isPowerOf2()) {
     Diag(E->getExprLoc(), diag::warn_omp_alignment_not_power_of_two)
         << E->getSourceRange();
     return ExprError();
   }
+  if (CKind == OMPC_collapse) {
+    DSAStack->setCollapseNumber(Result.getExtValue());
+  }
   return ICE;
 }
 
 OMPClause *Sema::ActOnOpenMPSafelenClause(Expr *Len, SourceLocation StartLoc,
                                           SourceLocation LParenLoc,
                                           SourceLocation EndLoc) {
   // OpenMP [2.8.1, simd construct, Description]
   // The parameter of the safelen clause must be a constant

test/OpenMP/for_codegen.cpp

 // RUN: %clang_cc1 -verify -fopenmp=libiomp5 -x c++ -triple x86_64-unknown-unknown -emit-llvm %s -fexceptions -fcxx-exceptions -o - | FileCheck %s
 // RUN: %clang_cc1 -fopenmp=libiomp5 -x c++ -std=c++11 -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -emit-pch -o %t %s
 // RUN: %clang_cc1 -fopenmp=libiomp5 -x c++ -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck %s
 // RUN: %clang_cc1 -verify -triple x86_64-apple-darwin10 -fopenmp=libiomp5 -fexceptions -fcxx-exceptions -gline-tables-only -x c++ -emit-llvm %s -o - | FileCheck %s --check-prefix=TERM_DEBUG
 //
 // expected-no-diagnostics
 #ifndef HEADER
 #define HEADER
 
 // CHECK: [[IDENT_T_TY:%.+]] = type { i32, i32, i32, i32, i8* }
-// CHECK: [[IMPLICIT_BARRIER_LOC:@.+]] = private unnamed_addr constant %{{.+}} { i32 0, i32 66, i32 0, i32 0, i8*
+// CHECK-DAG: [[IMPLICIT_BARRIER_LOC:@.+]] = private unnamed_addr constant %{{.+}} { i32 0, i32 66, i32 0, i32 0, i8*
+// CHECK-DAG: [[I:@.+]] = global i8 1,
+// CHECK-DAG: [[J:@.+]] = global i8 2,
+// CHECK-DAG: [[K:@.+]] = global i8 3,
+
 // CHECK-LABEL: define {{.*void}} @{{.*}}without_schedule_clause{{.*}}(float* {{.+}}, float* {{.+}}, float* {{.+}}, float* {{.+}})
 void without_schedule_clause(float *a, float *b, float *c, float *d) {
 // CHECK: [[GTID:%.+]] = call i32 @__kmpc_global_thread_num([[IDENT_T_TY]]* [[DEFAULT_LOC:[@%].+]])
   #pragma omp for nowait
 // CHECK: call void @__kmpc_for_static_init_4([[IDENT_T_TY]]* [[DEFAULT_LOC]], i32 [[GTID]], i32 34, i32* [[IS_LAST:%[^,]+]], i32* [[OMP_LB:%[^,]+]], i32* [[OMP_UB:%[^,]+]], i32* [[OMP_ST:%[^,]+]], i32 1, i32 1)
 // UB = min(UB, GlobalUB)
 // CHECK-NEXT: [[UB:%.+]] = load i32, i32* [[OMP_UB]]
 // CHECK-NEXT: [[UBCMP:%.+]] = icmp sgt i32 [[UB]], 4571423
#pragma omp for schedule(static, 5)
   for (unsigned i = 131071; i <= 2147483647; i += 127)
     a[i] += foo();
 }
 // Check source line corresponds to "#pragma omp for schedule(static, 5)" above:
 // TERM_DEBUG-DAG: [[DBG_LOC_START]] = !MDLocation(line: [[@LINE-15]],
 // TERM_DEBUG-DAG: [[DBG_LOC_END]] = !MDLocation(line: [[@LINE-16]],
 // TERM_DEBUG-DAG: [[DBG_LOC_CANCEL]] = !MDLocation(line: [[@LINE-17]],
 
+char i = 1, j = 2, k = 3;
+// CHECK-LABEL: for_with_global_lcv
+void for_with_global_lcv() {
+// CHECK: [[I_ADDR:%.+]] = alloca i8,
+// CHECK: [[J_ADDR:%.+]] = alloca i8,
+
+// CHECK: call void @__kmpc_for_static_init_4(
+// CHECK-NOT: [[I]]
+// CHECK: store i8 %{{.+}}, i8* [[I_ADDR]]
+// CHECK-NOT: [[I]]
+// CHECK: [[I_VAL:%.+]] = load i8, i8* [[I_ADDR]],
+// CHECK-NOT: [[I]]
+// CHECK: store i8 [[I_VAL]], i8* [[K]]
+// CHECK-NOT: [[I]]
+// CHECK: call void @__kmpc_for_static_fini(
+#pragma omp for
+  for (i = 0; i < 2; ++i) {
+    k = i;
+  }
+// CHECK: call void @__kmpc_for_static_init_4(
+// CHECK-NOT: [[J]]
+// CHECK: store i8 %{{.+}}, i8* [[J_ADDR]]
+// CHECK-NOT: [[J]]
+// CHECK: [[J_VAL:%.+]] = load i8, i8* [[J_ADDR]],
+// CHECK-NOT: [[J]]
+// CHECK: store i8 [[J_VAL]], i8* [[K]]
+// CHECK-NOT: [[J]]
+// CHECK: call void @__kmpc_for_static_fini(
+#pragma omp for collapse(2)
+  for (int i = 0; i < 2; ++i)
+  for (j = 0; j < 2; ++j) {
+    k = i;
+    k = j;
+  }
+}
+
 #endif // HEADER
 

test/OpenMP/for_loop_messages.cpp

 // expected-error@+2 {{loop iteration variable in the associated loop of 'omp for' directive may not be threadprivate or thread local, predetermined as private}}
 #pragma omp for
     for (sii = 0; sii < 10; sii += 1)
       c[sii] = a[sii];
   }
 
 #pragma omp parallel
   {
-// expected-error@+2 {{loop iteration variable in the associated loop of 'omp for' directive may not be a variable with global storage without being explicitly marked as private}}
 #pragma omp for
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] = a[globalii];
   }
 
 #pragma omp parallel
   {
-// expected-error@+3 {{loop iteration variable in the associated loop of 'omp for' directive may not be a variable with global storage without being explicitly marked as private}}
 #pragma omp for collapse(2)
     for (ii = 0; ii < 10; ii += 1)
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] += a[globalii] + ii;
   }
 
 #pragma omp parallel
 // expected-error@+2 {{statement after '#pragma omp for' must be a for loop}}

test/OpenMP/for_simd_loop_messages.cpp

 // expected-error@+2 {{loop iteration variable in the associated loop of 'omp for simd' directive may not be threadprivate or thread local, predetermined as linear}}
 #pragma omp for simd
     for (sii = 0; sii < 10; sii += 1)
       c[sii] = a[sii];
   }
 
 #pragma omp parallel
   {
-// expected-error@+2 {{loop iteration variable in the associated loop of 'omp for simd' directive may not be a variable with global storage without being explicitly marked as linear}}
 #pragma omp for simd
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] = a[globalii];
   }
 
 #pragma omp parallel
   {
-// expected-error@+3 {{loop iteration variable in the associated loop of 'omp for simd' directive may not be a variable with global storage without being explicitly marked as lastprivate}}
 #pragma omp for simd collapse(2)
     for (ii = 0; ii < 10; ii += 1)
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] += a[globalii] + ii;
   }
 
 #pragma omp parallel
 // expected-error@+2 {{statement after '#pragma omp for simd' must be a for loop}}

test/OpenMP/parallel_for_loop_messages.cpp

#pragma omp parallel for lastprivate(ii)
   {
 // expected-error@+2 {{loop iteration variable in the associated loop of 'omp parallel for' directive may not be threadprivate or thread local, predetermined as private}}
 #pragma omp parallel for
     for (sii = 0; sii < 10; sii += 1)
       c[sii] = a[sii];
   }
 
   {
-// expected-error@+2 {{loop iteration variable in the associated loop of 'omp parallel for' directive may not be a variable with global storage without being explicitly marked as private}}
 #pragma omp parallel for
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] = a[globalii];
   }
 
   {
-// expected-error@+3 {{loop iteration variable in the associated loop of 'omp parallel for' directive may not be a variable with global storage without being explicitly marked as private}}
 #pragma omp parallel for collapse(2)
     for (ii = 0; ii < 10; ii += 1)
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] += a[globalii] + ii;
   }
 
 // expected-error@+2 {{statement after '#pragma omp parallel for' must be a for loop}}
 #pragma omp parallel for

test/OpenMP/parallel_for_simd_loop_messages.cpp

#pragma omp parallel for simd lastprivate(ii)
   {
 // expected-error@+2 {{loop iteration variable in the associated loop of 'omp parallel for simd' directive may not be threadprivate or thread local, predetermined as linear}}
 #pragma omp parallel for simd
     for (sii = 0; sii < 10; sii += 1)
       c[sii] = a[sii];
   }
 
   {
-// expected-error@+2 {{loop iteration variable in the associated loop of 'omp parallel for simd' directive may not be a variable with global storage without being explicitly marked as linear}}
 #pragma omp parallel for simd
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] = a[globalii];
   }
 
   {
-// expected-error@+3 {{loop iteration variable in the associated loop of 'omp parallel for simd' directive may not be a variable with global storage without being explicitly marked as lastprivate}}
 #pragma omp parallel for simd collapse(2)
     for (ii = 0; ii < 10; ii += 1)
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] += a[globalii] + ii;
   }
 
 // expected-error@+2 {{statement after '#pragma omp parallel for simd' must be a for loop}}
 #pragma omp parallel for simd

test/OpenMP/simd_loop_messages.cpp

#pragma omp parallel
     // expected-error@+2 {{loop iteration variable in the associated loop of 'omp simd' directive may not be threadprivate or thread local, predetermined as linear}}
     #pragma omp simd
     for (sii = 0; sii < 10; sii+=1)
       c[sii] = a[sii];
   }
 
   #pragma omp parallel
   {
-    // expected-error@+2 {{loop iteration variable in the associated loop of 'omp simd' directive may not be a variable with global storage without being explicitly marked as linear}}
     #pragma omp simd
     for (globalii = 0; globalii < 10; globalii+=1)
       c[globalii] = a[globalii];
   }
 
   #pragma omp parallel
   {
-// expected-error@+3 {{loop iteration variable in the associated loop of 'omp simd' directive may not be a variable with global storage without being explicitly marked as lastprivate}}
 #pragma omp simd collapse(2)
     for (ii = 0; ii < 10; ii += 1)
     for (globalii = 0; globalii < 10; globalii += 1)
       c[globalii] += a[globalii] + ii;
   }
 
   // expected-error@+2 {{statement after '#pragma omp simd' must be a for loop}}
   #pragma omp simd