Fix symmetric_tensor_39

diff --git a/tests/base/symmetric_tensor_39.cc b/tests/base/symmetric_tensor_39.cc
index 039d8320c522f3098c792393912eaf94f4ae6b99..11aac44ad52298bf20e155dde9835c368d0d5775 100644 (file)
--- a/tests/base/symmetric_tensor_39.cc
+++ b/tests/base/symmetric_tensor_39.cc
@@ -13,11 +13,30 @@
 //
 // ---------------------------------------------------------------------
 
+// test that multiplying a rank-4 (identity) symmetric tensor and
+// a rank-2 symmetric tensor works correctly for VectorizedArray<double>
+
 #include "../tests.h"
 
 #include <deal.II/base/symmetric_tensor.h>
 #include <deal.II/base/vectorization.h>
 
+
+// Trying to fill the rank-2 ensor in the main function triggers a compiler bug
+// in clang-3.7.0 and clang-3.9.1 in release mode. Hence, use a separate function.
+template <int dim, typename Number>
+void fill_tensor(dealii::SymmetricTensor<2,dim,dealii::VectorizedArray<Number> > &A)
+{
+  Number counter = 0.0;
+  for (unsigned int i = 0; i < dim; ++i)
+    for (unsigned int j = 0; j < dim; ++j)
+      for (unsigned int v = 0; v < dealii::VectorizedArray<Number>::n_array_elements; v++)
+        {
+          A[i][j][v] = counter;
+          counter += 1.0;
+        }
+}
+
 int main()
 {
   initlog();
@@ -35,14 +54,7 @@ int main()
         for (unsigned int l = 0; l < dim; l++)
           I[i][j][k][l] = ( (i == k && j== l && i == l && j == k) ? make_vectorized_array(1.0) : ( (i == k && j== l) || (i == l && j == k) ? make_vectorized_array(0.5) : make_vectorized_array(0.0)));
 
-  double counter = 0.0;
-  for (unsigned int i = 0; i < dim; ++i)
-    for (unsigned int j = 0; j < dim; ++j)
-      for (unsigned int v = 0; v < VectorizedArray<double>::n_array_elements; v++)
-        {
-          A[i][j][v] = counter;
-          counter += 1.0;
-        }
+  fill_tensor(A);
 
   B = I*A;
   B -= A;