yosys/tests/opt/opt_expr_mux_undef.ys

read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 2 width 16 \in
  wire input 3 width 4 \sel
  cell $_MUX16_ \mux
    connect \A \in [0]
    connect \B \in [1]
    connect \C \in [2]
    connect \D \in [3]
    connect \E \in [4]
    connect \F \in [5]
    connect \G \in [6]
    connect \H \in [7]
    connect \I \in [8]
    connect \J \in [9]
    connect \K \in [10]
    connect \L \in [11]
    connect \M \in [12]
    connect \N \in [13]
    connect \O \in [14]
    connect \P \in [15]
    connect \S \sel [0]
    connect \T \sel [1]
    connect \U \sel [2]
    connect \V \sel [3]
    connect \Y \out
  end
end
EOT

##########
# all undef
# no mux
# output undef

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  cell $mux \mux
    parameter \WIDTH 1
    connect \A 1'x
    connect \B 1'x
    connect \S 1'x
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$mux
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  cell $_MUX_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \S 1'x
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX_
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  cell $_MUX4_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \S 1'x
    connect \T 1'x
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX4_

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  cell $_MUX8_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \E 1'x
    connect \F 1'x
    connect \G 1'x
    connect \H 1'x
    connect \S 1'x
    connect \T 1'x
    connect \U 1'x
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX8_

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  cell $_MUX16_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \E 1'x
    connect \F 1'x
    connect \G 1'x
    connect \H 1'x
    connect \I 1'x
    connect \J 1'x
    connect \K 1'x
    connect \L 1'x
    connect \M 1'x
    connect \N 1'x
    connect \O 1'x
    connect \P 1'x
    connect \S 1'x
    connect \T 1'x
    connect \U 1'x
    connect \V 1'x
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX16_

##########
# a and b undef
# no mux
# output undef

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 3 \sel
  cell $mux \mux
    parameter \WIDTH 1
    connect \A 1'x
    connect \B 1'x
    connect \S \sel
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$mux
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 3 \sel
  cell $_MUX_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \S \sel
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX_
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 3 width 2 \sel
  cell $_MUX4_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \S \sel [0]
    connect \T \sel [1]
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX4_
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 3 width 3 \sel
  cell $_MUX8_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \E 1'x
    connect \F 1'x
    connect \G 1'x
    connect \H 1'x
    connect \S \sel [0]
    connect \T \sel [1]
    connect \U \sel [2]
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX8_
select -assert-count 1 o:out %ci*

##

design -reset
read_rtlil <<EOT
module \uut
  wire output 1 \out
  wire input 3 width 4 \sel
  cell $_MUX16_ \mux
    connect \A 1'x
    connect \B 1'x
    connect \C 1'x
    connect \D 1'x
    connect \E 1'x
    connect \F 1'x
    connect \G 1'x
    connect \H 1'x
    connect \I 1'x
    connect \J 1'x
    connect \K 1'x
    connect \L 1'x
    connect \M 1'x
    connect \N 1'x
    connect \O 1'x
    connect \P 1'x
    connect \S \sel [0]
    connect \T \sel [1]
    connect \U \sel [2]
    connect \V \sel [3]
    connect \Y \out
  end
end
EOT

opt_expr -mux_undef
select -assert-none t:$_MUX16_
select -assert-count 1 o:out %ci*

##########