Guard Vec8d template specialization with MAX_VECTOR_SIZE

dune/perftool/common/vectorclass.hh

@@ -28,17 +28,21 @@ struct base_floatingpoint<Vec4d>
 };
 
 template<>
-struct base_floatingpoint<Vec8d>
+struct base_floatingpoint<Vec8f>
 {
-  using value = double;
+  using value = float;
 };
 
+#if MAX_VECTOR_SIZE >= 512
+
 template<>
-struct base_floatingpoint<Vec8f>
+struct base_floatingpoint<Vec8d>
 {
-  using value = float;
+  using value = double;
 };
 
+#endif
+
 #else
 
 #include <algorithm>