Filter symbol-mapping by used-symbols when generating nested SDFG cal…

…ls and signatures.

dace/codegen/targets/cpu.py

@@ -1519,9 +1519,10 @@ def make_restrict(expr: str) -> str:
         arguments += [
             f'{atype} {restrict} {aname}' for (atype, aname, _), restrict in zip(memlet_references, restrict_args)
         ]
+        used_symbols = node.sdfg.used_symbols(all_symbols=False)
         arguments += [
             f'{node.sdfg.symbols[aname].as_arg(aname)}' for aname in sorted(node.symbol_mapping.keys())
-            if aname not in sdfg.constants
+            if aname in used_symbols and aname not in sdfg.constants
         ]
         arguments = ', '.join(arguments)
         return f'void {sdfg_label}({arguments}) {{'
@@ -1530,9 +1531,11 @@ def generate_nsdfg_call(self, sdfg, state, node, memlet_references, sdfg_label,
         prepend = []
         if state_struct:
             prepend = ['__state']
+        used_symbols = node.sdfg.used_symbols(all_symbols=False)
         args = ', '.join(prepend + [argval for _, _, argval in memlet_references] + [
             cpp.sym2cpp(symval)
-            for symname, symval in sorted(node.symbol_mapping.items()) if symname not in sdfg.constants
+            for symname, symval in sorted(node.symbol_mapping.items())
+            if symname in used_symbols and symname not in sdfg.constants
         ])
         return f'{sdfg_label}({args});'