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

[Alexey Bataev via llvm-branch-commits]

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@@ -870,6 +870,106 @@ class OMPSizesClause final
   }
 };
 
+/// This class represents the 'permutation' clause in the
+/// '#pragma omp interchange' directive.
+///
+/// \code{c}
+///   #pragma omp interchange permutation(2,1)
+///   for (int i = 0; i < 64; ++i)
+///     for (int j = 0; j < 64; ++j)
+/// \endcode
+class OMPPermutationClause final
+    : public OMPClause,
+      private llvm::TrailingObjects<OMPSizesClause, Expr *> {
+  friend class OMPClauseReader;
+  friend class llvm::TrailingObjects<OMPSizesClause, Expr *>;
+
+  /// Location of '('.
+  SourceLocation LParenLoc;
+
+  /// Number of arguments in the clause, and hence also the number of loops to
+  /// be permuted.
+  unsigned NumLoops;
+
+  /// Sets the permutation index expressions.
+  void setArgRefs(ArrayRef<Expr *> VL) {
+    assert(VL.size() == NumLoops);
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alexey-bataev wrote:

Add assertion message

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