[Test] Check if SIMD in padding node is set to input channels after conversion to hls

tests/fpgadataflow/test_convert_to_hls_conv_layer.py

@@ -23,6 +23,7 @@ from finn.transformation.fpgadataflow.prepare_cppsim import PrepareCppSim
 from finn.transformation.fpgadataflow.compile_cppsim import CompileCppSim
 from finn.transformation.fpgadataflow.set_exec_mode import SetExecMode
 from finn.custom_op.im2col import compute_conv_output_dim
+from finn.custom_op.registry import getCustomOp
 
 # conv_config  kernel_size,stride, pad
 
@@ -110,3 +111,8 @@ def test_convert_to_hls_conv_layer(conv_config, exec_mode):
     assert oxe.compare_execution(model, new_model, inp_dict)
     if kernel_size == 1 and stride > 1 and pad == 0:
         assert new_model.graph.node[1].op_type == "DownSampler"
+
+    if pad == 1:
+        padding_node = new_model.get_nodes_by_op_type("FMPadding_Batch")[0]
+        padding_inst = getCustomOp(padding_node)
+        assert padding_inst.get_nodeattr("SIMD") == in_chn