[flang-commits] [clang] [flang] [llvm] [openmp] [Clang][OpenMP] Add permutation clause (PR #92030)

[Michael Kruse via flang-commits]

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@@ -16029,6 +16074,44 @@ OMPClause *SemaOpenMP::ActOnOpenMPSizesClause(ArrayRef<Expr *> SizeExprs,
                                 SanitizedSizeExprs);
 }
 
+OMPClause *SemaOpenMP::ActOnOpenMPPermutationClause(ArrayRef<Expr *> PermExprs,
+                                                    SourceLocation StartLoc,
+                                                    SourceLocation LParenLoc,
+                                                    SourceLocation EndLoc) {
+  size_t NumLoops = PermExprs.size();
+  SmallVector<Expr *> SanitizedPermExprs;
+  llvm::append_range(SanitizedPermExprs, PermExprs);
+
+  for (Expr *&PermExpr : SanitizedPermExprs) {
+    // Skip if template-dependent or already sanitized, e.g. during a partial
+    // template instantiation.
+    if (!PermExpr || PermExpr->isInstantiationDependent())
+      continue;
+
+    llvm::APSInt PermVal;
+    ExprResult PermEvalExpr = SemaRef.VerifyIntegerConstantExpression(
+        PermExpr, &PermVal, Sema::AllowFold);
+    bool IsValid = PermEvalExpr.isUsable();
+    if (IsValid)
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Meinersbur wrote:

In partial template instantiations the expression may not evaluate to a constant yet because it depends on another template parameter. We cannot set `PermExpr` to nullptr because we need to preserve the expression to be evaluated at another call to `ActOnOpenMPPermutationClause` when the template is fully instantiated.

https://github.com/llvm/llvm-project/pull/92030