Updated the tests to check for a fifo size that was previously splitting with a fifo depth of 1, added an assertion to check all fifo depths are okay

Author: STFleming

src/finn/transformation/fpgadataflow/set_fifo_depths.py

@@ -539,7 +539,7 @@ def decompose_pow2(x):
     ret_final = []
     for cand_depth in ret_pass2:
         if cand_depth <= max_qsrl_depth:
-            ret_final.append((max(2,cand_depth), "rtl"))
+            ret_final.append((max(2, cand_depth), "rtl"))
         else:
             ret_final.append((cand_depth, "vivado"))
 

tests/fpgadataflow/test_split_large_fifos.py

@@ -63,7 +63,7 @@ def get_folding_cfg(depth=65536):
 @pytest.mark.slow
 @pytest.mark.vivado
 @pytest.mark.fpgadataflow
-@pytest.mark.parametrize("depth", [16384, 65536, 45000])
+@pytest.mark.parametrize("depth", [16384, 65536, 45000, 1537])
 @pytest.mark.parametrize("force_python_rtlsim", ["True", "False"])
 def test_split_large_fifos(depth, force_python_rtlsim):
     tmp_output_dir = fetch_test_model("tfc")
@@ -103,6 +103,7 @@ def test_split_large_fifos(depth, force_python_rtlsim):
         inst = getCustomOp(fifo_node)
         fifo_depth = inst.get_nodeattr("depth")
         assert fifo_depth == golden_cfg[i % len(golden_cfg)][0]
+        assert fifo_depth > 1
 
     shutil.rmtree(tmp_output_dir)