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Add muxcover regression test.

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nella 2026-06-10 14:46:04 +02:00
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commit 83a8245734
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# https://github.com/YosysHQ/yosys/issues/964
read_verilog -formal <<EOT
module mux_index_8_2 #(parameter N=8, parameter W=2) (input [N*W-1:0] i, input [$clog2(N)-1:0] s, output [W-1:0] o);
assign o = i[s*W+:W];
endmodule
EOT
prep
design -save gold
opt
peepopt
techmap
opt
muxcover -mux8
clean
opt_expr -mux_bool
select -assert-count 2 t:$_MUX8_
select -assert-count 0 t:$_MUX_ t:$_MUX4_ t:$_MUX16_
select -assert-count 0 t:$_AND_ t:$_OR_ t:$_XOR_ t:$_NAND_ t:$_NOR_ t:$_XNOR_
techmap -map +/simcells.v t:$_MUX8_
design -stash gate
design -import gold -as gold
design -import gate -as gate
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts miter
design -reset
read_verilog -formal <<EOT
module mux_index_8_3 #(parameter N=8, parameter W=3) (input [N*W-1:0] i, input [$clog2(N)-1:0] s, output [W-1:0] o);
assign o = i[s*W+:W];
endmodule
EOT
prep
design -save gold
opt
peepopt
techmap
opt
muxcover -mux8
clean
opt_expr -mux_bool
select -assert-count 3 t:$_MUX8_
select -assert-count 0 t:$_MUX_ t:$_MUX4_ t:$_MUX16_
select -assert-count 0 t:$_AND_ t:$_OR_ t:$_XOR_ t:$_NAND_ t:$_NOR_ t:$_XNOR_
techmap -map +/simcells.v t:$_MUX8_
design -stash gate
design -import gold -as gold
design -import gate -as gate
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts miter
design -reset
read_verilog -formal <<EOT
module mux_index_8_4 #(parameter N=8, parameter W=4) (input [N*W-1:0] i, input [$clog2(N)-1:0] s, output [W-1:0] o);
assign o = i[s*W+:W];
endmodule
EOT
prep
design -save gold
opt
peepopt
techmap
opt
muxcover -mux8
clean
opt_expr -mux_bool
select -assert-count 4 t:$_MUX8_
select -assert-count 0 t:$_MUX_ t:$_MUX4_ t:$_MUX16_
select -assert-count 0 t:$_AND_ t:$_OR_ t:$_XOR_ t:$_NAND_ t:$_NOR_ t:$_XNOR_
techmap -map +/simcells.v t:$_MUX8_
design -stash gate
design -import gold -as gold
design -import gate -as gate
miter -equiv -flatten -make_assert -make_outputs gold gate miter
sat -verify -prove-asserts miter