Opencl datahandling

Since the target_dh_refactoring was never merged, we decided to do the refactoring at smaller steps and recover the original OpenCL datahandling PR.

Refactoring to merge target and backend can be done later.

pystencils/backends/cbackend.py

@@ -353,6 +353,9 @@ class CustomSympyPrinter(CCodePrinter):
         result = super(CustomSympyPrinter, self)._print_Piecewise(expr)
         return result.replace("\n", "")
 
+    def _print_Type(self, node):
+        return str(node)
+
     def _print_Function(self, expr):
         infix_functions = {
             bitwise_xor: '^',
@@ -365,7 +368,7 @@ class CustomSympyPrinter(CCodePrinter):
             return expr.to_c(self._print)
         if isinstance(expr, reinterpret_cast_func):
             arg, data_type = expr.args
-            return "*((%s)(& %s))" % (PointerType(data_type, restrict=False), self._print(arg))
+            return "*((%s)(& %s))" % (self._print(PointerType(data_type, restrict=False)), self._print(arg))
         elif isinstance(expr, address_of):
             assert len(expr.args) == 1, "address_of must only have one argument"
             return "&(%s)" % self._print(expr.args[0])