read_verilog << EOT
module ibuf ((* iopad_external_pin *) input i, output o); endmodule
module obuf (input i, (* iopad_external_pin *) output o); endmodule
module obuft (input i, input oe, (* iopad_external_pin *) output o); endmodule
module iobuf (input i, input oe, output o, (* iopad_external_pin *) inout io); endmodule

module a(input i, output o);
assign o = i;
endmodule

module b(input i, output o);
assign o = i;
ibuf b (.i(i), .o(o));
endmodule

module c(input i, output o);
obuf b (.i(i), .o(o));
endmodule

module d(input i, oe, output o, o2, o3);
assign o = oe ? i : 1'bz;
assign o2 = o;
assign o3 = ~o;
endmodule

module e(input i, oe, inout io, output o2, o3);
assign io = oe ? i : 1'bz;
assign o2 = io;
assign o3 = ~io;
endmodule

module f(output o, o2);
assign o = 1'bz;
endmodule

module g(inout io, output o);
assign o = io;
endmodule

module h(inout io, output o, input i);
assign io = i;
assign o = io;
endmodule

EOT

opt_clean
tribuf
simplemap
iopadmap -bits -inpad ibuf o:i -outpad obuf i:o -toutpad obuft oe:i:o -tinoutpad iobuf oe:o:i:io
opt_clean

select -assert-count 1 a/t:ibuf
select -assert-count 1 a/t:obuf
select -set ib w:i %a %co a/t:ibuf %i
select -set ob w:o %a %ci a/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i

select -assert-count 1 b/t:ibuf
select -assert-count 1 b/t:obuf
select -set ib w:i %a %co b/t:ibuf %i
select -set ob w:o %a %ci b/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i

select -assert-count 1 c/t:ibuf
select -assert-count 1 c/t:obuf
select -set ib w:i %a %co c/t:ibuf %i
select -set ob w:o %a %ci c/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i

select -assert-count 2 d/t:ibuf
select -assert-count 2 d/t:obuf
select -assert-count 1 d/t:obuft
select -set ib w:i %a %co d/t:ibuf %i
select -set oeb w:oe %a %co d/t:ibuf %i
select -set ob w:o %a %ci d/t:obuft %i
select -set o2b w:o2 %a %ci d/t:obuf %i
select -set o3b w:o3 %a %ci d/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @oeb
select -assert-count 1 @ob
select -assert-count 1 @o2b
select -assert-count 1 @o3b
select -assert-count 1 @ib %co %co @ob %i
select -assert-count 1 @oeb %co %co @ob %i
select -assert-count 1 @ib %co %co @o2b %i
select -assert-count 1 @ib %co %co t:$_NOT_ %i
select -assert-count 1 @o3b %ci %ci t:$_NOT_ %i

select -assert-count 2 e/t:ibuf
select -assert-count 2 e/t:obuf
select -assert-count 1 e/t:iobuf
select -set ib w:i %a %co e/t:ibuf %i
select -set oeb w:oe %a %co e/t:ibuf %i
select -set iob w:io %a %ci e/t:iobuf %i
select -set o2b w:o2 %a %ci e/t:obuf %i
select -set o3b w:o3 %a %ci e/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @oeb
select -assert-count 1 @iob
select -assert-count 1 @o2b
select -assert-count 1 @o3b
select -assert-count 1 @ib %co %co @iob %i
select -assert-count 1 @oeb %co %co @iob %i
select -assert-count 1 @iob %co %co @o2b %i
select -assert-count 1 @iob %co %co t:$_NOT_ %i
select -assert-count 1 @o3b %ci %ci t:$_NOT_ %i

select -assert-count 2 f/t:obuft

select -assert-count 1 g/t:obuf
select -assert-count 1 g/t:iobuf

select -assert-count 1 h/t:ibuf
select -assert-count 1 h/t:iobuf
select -assert-count 1 h/t:obuf