Use default block size if block size fitting fails

src/pystencils/codegen/gpu_indexing.py

@@ -4,6 +4,7 @@ from abc import ABC, abstractmethod
 from dataclasses import dataclass
 from typing import cast, Any, Callable
 from itertools import chain
+from warnings import warn
 
 from .functions import Lambda
 from .parameters import Parameter
@@ -295,10 +296,15 @@ class DynamicBlockSizeLaunchConfiguration(GpuLaunchConfiguration):
         num_work_items = cast(
             dim3, tuple(int(wit(**kwargs)) for wit in self._num_work_items)
         )
+        try:
             reduced_block_size = cast(
                 dim3,
                 self.fit_block_size(num_work_items, self._block_size, self._hw_props),
             )
+        except CodegenError:
+            warn(f"Block size fitting could not determine optimal block size configuration. "
+                 f"Defaulting back to {self._block_size}")
+            reduced_block_size = self._block_size
         grid_size = cast(
             dim3,
             tuple(