Add critical path computation

b_asic/signal_flow_graph.py

@@ -1451,3 +1451,9 @@ class SFG(AbstractOperation):
         if format is not None:
             dg.format = format
         dg.view()
+
+    def critical_path(self):
+        # Import here needed to avoid circular imports
+        from b_asic.schedule import Schedule
+
+        return Schedule(self, scheduling_algorithm="ASAP").schedule_time

test/test_sfg.py

@@ -1559,3 +1559,11 @@ class TestSFGErrors:
             match=re.escape("Output index out of range (expected 0-0, got 1)"),
         ):
             sfg.inputs_required_for_output(1)
+
+
+class TestCriticalPath:
+    def test_single_accumulator(self, sfg_simple_accumulator: SFG):
+        sfg_simple_accumulator.set_latency_of_type(Addition.type_name(), 5)
+        sfg_simple_accumulator.inputs[0].latency_offset = 0
+        sfg_simple_accumulator.outputs[0].latency_offset = 0
+        assert sfg_simple_accumulator.critical_path() == 5