[Openmp-commits] [PATCH] D108132: Add implicit map for a list item appears in a reduction clause.

Jennifer Yu via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Tue Aug 17 12:15:56 PDT 2021

jyu2 added inline comments.

Comment at: clang/lib/Sema/SemaOpenMP.cpp:5825
+          for (Expr *E : RC->varlists())
+            if (!dyn_cast<DeclRefExpr>(E))
+              ImplicitExprs.emplace_back(E);
ABataev wrote:
> jyu2 wrote:
> > ABataev wrote:
> > > `isa`. Also, what if this is a `MemberExpr`?
> > Yes isa.   Changed.  Thanks.
> > 
> > For reduction MemeberExpr is not allowed, it is only allowed variable name, array element or array section.
> I would also do this check if it is a not template parsing/analysis mode + also would do this for `E->IgnoreParensImpCasts()`
The code already under non DependentContext().  I add IgnoreParenImpCasts().  Thanks.

 if (AStmt && !CurContext->isDependentContext() && Kind != OMPD_atomic &&
      Kind != OMPD_critical && Kind != OMPD_section && Kind != OMPD_master &&
      Kind != OMPD_masked && !isOpenMPLoopTransformationDirective(Kind))

Comment at: clang/lib/Sema/SemaOpenMP.cpp:19481-19482
     if (VD && DSAS->isThreadPrivate(VD)) {
+      if (NoDiagnose)
+        continue;
       DSAStackTy::DSAVarData DVar = DSAS->getTopDSA(VD, /*FromParent=*/false);
ABataev wrote:
> jyu2 wrote:
> > ABataev wrote:
> > > Hmm, should not we still diagnose this case?
> > The rule is skip the error as well as skip adding implicit map clause.  So that we don't get regression for old code.
> I think we already have the check for it for the reduction clause, so I think we can skip this check here.
In general yes.  But not for some special case, please look clang/test/OpenMP/reduction_implicit_map.cpp, in the first test,  if I remove this change the error will be emit.  In CUDA device code, the local variable is  implicitly threat as thridprivate.

#if defined(CUDA)
// expected-no-diagnostics

int foo(int n) {
  double *e;
  //no error and no implicit map generated for e[:1]
  #pragma omp target parallel reduction(+: e[:1])
  return 0;

  rG LLVM Github Monorepo



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