Draft: Changes for compatibility with pystencils 2.0

Introduce a significant number of patches for compatibility with the upcoming pystencils 2.0.

Status:

• Fix field duplication in create_lb_update_rule: Remove the workaround once field duplication is fixed in pystencils
• Data types in boundary handling: LatticeBoltzmannBoundaryHandling does not allow to specify a data type and always uses float64. This leads to type errors when combined with LB fields with float32 dtype.
• Mixed precision: Need to explicitly insert casts at field reads/writes when computing and storing PDFs in different float formats

src/lbmpy/_compat.py

@@ -13,7 +13,13 @@ if PYSTENCILS_VERSION_MAJOR == 2:
         return DEFAULTS.spatial_counters[coord]
 
     def get_supported_instruction_sets():
-        return []
+        from pystencils import Target
+        vector_targets = Target.available_vector_cpu_targets()
+        isas = []
+        for target in vector_targets:
+            tokens = target.name.split("_")
+            isas.append(tokens[-1].lower())
+        return isas
 
 else:
     from pystencils.backends.simd_instruction_sets import (