Fix hashing of stage 3 input

python/dune/perftool/sumfact/accumulation.py

@@ -61,8 +61,15 @@ def accum_iname(restriction, bound, i):
     return sumfact_iname(bound, "accum")
 
 
-class AlreadyAssembledInput(SumfactKernelInputBase, ImmutableRecord):
-    pass
+class AlreadyAssembledInput(SumfactKernelInputBase):
+    def __init__(self, index):
+        self.index = index
+
+    def __eq__(self, other):
+        return type(self) == type(other) and self.index == other.index
+
+    def __hash__(self):
+        return 0
 
 
 @backend(interface="accum_insn", name="sumfact")
@@ -91,8 +98,6 @@ def generate_accumulation_instruction(visitor, accterm, measure, subdomain_id):
     accum_index = None
     if visitor.indices:
         accum_index = visitor.indices[0]
-    if accterm.argument.index:
-        accum_index = accterm.argument.index[0]._value
 
     jacobian_inames = tuple()
     if accterm.is_jacobian: