Tile.getWireConnections() not consistent with Vivado

[eddieh-xlnx]

Javadoc for Tile.getWireConnections() states that it should be equivalent to:

get_nodes -downhill -of_objects [get_nodes -of [get_wires -of $tile/$wireName]]]

Applying it in the following way on a xcvp1002 in Vivado:

get_nodes -downhill -of [get_nodes -of [get_wires CLK_REBUF_VERT_VNOC_BAO_TILE_X30Y471/IF_WRAP_CLK_V_BOT_CLK_VDISTR21]]
WARNING: [Vivado 12-2683] No nodes matched 'get_nodes -downhill -of [get_nodes -of [get_wires CLK_REBUF_VERT_VNOC_BAO_TILE_X30Y471/IF_WRAP_CLK_V_BOT_CLK_VDISTR21]]'

returns nothing.

But this test demonstrates that RapidWright returns:

Expected :[]
Actual   :[CLK_REBUF_VERT_VNOC_CBO_TILE_X30Y375/IF_WRAP_CLK_V_TOP_CLK_VDISTR21, INVALID1_X30Y431/null]

1. CLK_REBUF_VERT_VNOC_CBO_TILE_X30Y375/IF_WRAP_CLK_V_TOP_CLK_VDISTR21 seems to be a wire on the original input node:

get_nodes -of [get_wires CLK_REBUF_VERT_VNOC_CBO_TILE_X30Y375/IF_WRAP_CLK_V_TOP_CLK_VDISTR21]
CLK_REBUF_VERT_VNOC_BAO_TILE_X30Y471/IF_WRAP_CLK_V_BOT_CLK_VDISTR21

2. Obviously returning INVALID1_X30Y431/null is not desirable.

[eddieh-xlnx]

Oh, the other interesting point is that doing a get_wires instead of a get_nodes gives:

get_wires -downhill -of [get_nodes -of [get_wires CLK_REBUF_VERT_VNOC_BAO_TILE_X30Y471/IF_WRAP_CLK_V_BOT_CLK_VDISTR21]]
CLK_REBUF_VERT_VNOC_BAO_TILE_X30Y471/IF_WRAP_CLK_V_BOT_CLK_VDISTR21 CLK_REBUF_VERT_VNOC_CBO_TILE_X30Y375/IF_WRAP_CLK_V_TOP_CLK_VDISTR21