restore old code path for matrices > 3x3

python/dune/codegen/pdelab/tensors.py

@@ -123,12 +123,6 @@ def name_matrix_inverse(name, shape, visitor):
     return name_inv
 
 
-def matrix_inverse(name, shape, visitor):
-    name_inv = name_matrix_inverse(name, shape, visitor)
-
-    return prim.Variable(name_inv)
-
-
 def define_assembled_tensor(name, expr, visitor):
     temporary_variable(name,
                        shape=expr.ufl_shape,
@@ -157,6 +151,18 @@ def pymbolic_matrix_inverse(o, visitor):
     indices = visitor.indices
     visitor.indices = None
     name = name_assembled_tensor(expr, visitor)
+
+    if expr.shape[0] <= 3:
+        name = name_matrix_inverse(name, expr.ufl_shape, visitor)
+    else:
+        instruction(code="{}.invert();".format(name),
+                    within_inames=frozenset(visitor.quadrature_inames()),
+                    depends_on=frozenset({lp.match.Writes(name),
+                                          lp.match.Tagged("sumfact_stage1"),
+                                          }),
+                    tags=frozenset({"quad"}),
+                    )
+
     visitor.indices = indices
 
-    return matrix_inverse(name, expr.ufl_shape, visitor)
+    return prim.Variable(name)