read_verilog <<EOT
module split_output (A, B, Y, magic);
	input [1:0] A;
	input [1:0] B;
	output [1:0] Y;
	input magic;
    wire W;
    assign Y = A + B;
    assign W = Y[0]; // <--- look here
endmodule
EOT
proc
design -save split_output
# Basic -value test
abstract -value -enable magic w:W
check -assert
# Connections to $add Y output port
select -set conn_to_y t:$add %x:+[Y] t:$add %d
# The $add Y output port feeds partially into a mux
select -set mux @conn_to_y %ci t:$mux %i
select -assert-count 1 @mux
# and also the Y module output
select -assert-count 1 @conn_to_y %a o:Y %i
# The S input port is fed with the magic wire
select -assert-count 1 @mux %x:+[S] w:magic %i
# The B input port is fed with an anyseq
select -assert-count 1 @mux %x:+[B] %ci t:$anyseq %i
# The Y output port feeds into the Y module output
select -assert-count 1 @mux %x:+[Y] %co o:Y %i
# -----------------------------------------------------------------------------
# Same thing, but we use -slice instead of wire W
design -reset
read_verilog <<EOT
module split_output_no_w (A, B, Y, magic);
	input [1:0] A;
	input [1:0] B;
	output [1:0] Y;
	input magic;
    assign Y = A + B;
endmodule
EOT
proc
# Same test as the previous case
abstract -value -enable magic -slice 0 w:Y
check -assert
select -set conn_to_y t:$add %x:+[Y] t:$add %d
select -set mux @conn_to_y %ci t:$mux %i
select -assert-count 1 @mux
select -assert-count 1 @conn_to_y %a o:Y %i
select -assert-count 1 @mux %x:+[S] w:magic %i
select -assert-count 1 @mux %x:+[B] %ci t:$anyseq %i
select -assert-count 1 @mux %x:+[Y] %co o:Y %i
# -----------------------------------------------------------------------------
design -reset
read_verilog <<EOT
module split_input (A, B, Y, magic);
	input [1:0] A;
	input [1:0] B;
	output [1:0] Y;
	input magic;
    wire W;
    assign Y = A + B;
    assign W = A[0]; // <--- look here
endmodule
EOT
proc
design -save split_input
# The mux goes on an input this time
abstract -value -enable magic w:W
check -assert
# Connections to add A input port
select -set conn_to_a t:$add %x:+[A] t:$add %d
# The B input port is partially fed with a mux
select -set mux @conn_to_a %ci t:$mux %i
select -assert-count 1 @mux
# and also the A input
select -assert-count 1 @conn_to_a %a w:A %i
# The S input port is fed with the magic wire
select -assert-count 1 @mux %x:+[S] w:magic %i
# The A input port is fed with the module input A
select -assert-count 1 @mux %x:+[A] %ci i:A %i
# The B input port is fed with an anyseq
select -assert-count 1 @mux %x:+[B] %ci t:$anyseq %i
# -----------------------------------------------------------------------------
# All wires selected, excluding magic -> muxes on inputs and outputs
design -load split_output
select -assert-count 0 t:$mux
abstract -value -enable magic w:* w:magic %d
select -assert-count 3 t:$mux
# All cells selected -> muxes on outputs only
design -load split_output
select -assert-count 0 t:$mux
abstract -value -enable magic t:*
select -assert-count 1 t:$mux
# -----------------------------------------------------------------------------