# vsim work.TwoPButterfly_tb
# Loading work.TwoPButterfly_tb
# Loading work.TwoPButterfly
# Loading work.add_sub
# ** Error: (vsim-3053) 2-point_butterfly.v(12): Illegal output or inout port connection for "port 'S'".
#         Region: /TwoPButterfly_tb/T1/adder1
# ** Error: (vsim-3053) 2-point_butterfly.v(12): Illegal output or inout port connection for "port 'E'".
#         Region: /TwoPButterfly_tb/T1/adder1
# ** Error: (vsim-3053) 2-point_butterfly.v(12): Illegal output or inout port connection for "port 'F'".
#         Region: /TwoPButterfly_tb/T1/adder1
# ** Error: (vsim-3053) 2-point_butterfly.v(13): Illegal output or inout port connection for "port 'S'".
#         Region: /TwoPButterfly_tb/T1/adder2
# ** Error: (vsim-3053) 2-point_butterfly.v(13): Illegal output or inout port connection for "port 'E'".
#         Region: /TwoPButterfly_tb/T1/adder2
# ** Error: (vsim-3053) 2-point_butterfly.v(13): Illegal output or inout port connection for "port 'F'".
#         Region: /TwoPButterfly_tb/T1/adder2
# ** Error: (vsim-3053) 2-point_butterfly.v(16): Illegal output or inout port connection for "port 'S'".
#         Region: /TwoPButterfly_tb/T1/subtractor1
# ** Error: (vsim-3053) 2-point_butterfly.v(16): Illegal output or inout port connection for "port 'E'".
#         Region: /TwoPButterfly_tb/T1/subtractor1
# ** Error: (vsim-3053) 2-point_butterfly.v(16): Illegal output or inout port connection for "port 'F'".
#         Region: /TwoPButterfly_tb/T1/subtractor1
# ** Error: (vsim-3053) 2-point_butterfly.v(17): Illegal output or inout port connection for "port 'S'".
#         Region: /TwoPButterfly_tb/T1/subtractor2
# ** Error: (vsim-3053) 2-point_butterfly.v(17): Illegal output or inout port connection for "port 'E'".
#         Region: /TwoPButterfly_tb/T1/subtractor2
# ** Error: (vsim-3053) 2-point_butterfly.v(17): Illegal output or inout port connection for "port 'F'".
#         Region: /TwoPButterfly_tb/T1/subtractor2