compiler: Add KernelLaunchClusterConfig error handler

Author: FabioLuporini

devito/operator/operator.py

@@ -703,6 +703,15 @@ def _postprocess_errors(self, retval):
                 "due to excessive register pressure in one of the Operator "
                 "kernels. Try supplying a smaller `par-tile` value."
             )
+        elif retval == error_mapper['KernelLaunchClusterConfig']:
+            raise ExecutionError(
+                "Kernel launch failed due to an invalid thread block cluster "
+                "configuration. This is probably due to a `tbc-tile` value that "
+                "does not perfectly divide the number of blocks launched for a "
+                "kernel. This is a known, strong limitation which effectively "
+                "prevents the use of `tbc-tile` in realistic scenarios, but it "
+                "will be removed in future versions."
+            )
         elif retval == error_mapper['KernelLaunchUnknown']:
             raise ExecutionError(
                 "Kernel launch failed due to an unknown error. This might "

devito/passes/iet/errors.py

@@ -109,5 +109,6 @@ class Retval(LocalObject, Expr):
     'Stability': 100,
     'KernelLaunch': 200,
     'KernelLaunchOutOfResources': 201,
-    'KernelLaunchUnknown': 202,
+    'KernelLaunchClusterConfig': 202,
+    'KernelLaunchUnknown': 203,
 }