yosys/tests/various/wreduce.ys

read_verilog <<EOT
module wreduce_add_test(input [3:0] i, input [7:0] j, output [8:0] o);
    assign o = (i << 4) + j;
endmodule
EOT

hierarchy -auto-top
proc
design -save gold

prep # calls wreduce

select -assert-count 1 t:$add r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=5 %i %i %i

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 -show-ports miter

##########

read_verilog <<EOT
module wreduce_sub_test1(input [3:0] i, input [7:0] j, output [8:0] o);
    assign o = j - (i << 4);
endmodule
EOT

hierarchy -auto-top
proc
design -save gold

prep # calls wreduce

select -assert-count 1 t:$sub r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=5 %i %i %i

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 -show-ports miter

##########

read_verilog <<EOT
module wreduce_sub_test2(input [3:0] i, input [7:0] j, output [8:0] o);
    assign o = (i << 4) - j;
endmodule
EOT

hierarchy -auto-top
proc
design -save gold

prep # calls wreduce

select -assert-count 1 t:$sub r:A_WIDTH=8 r:B_WIDTH=8 r:Y_WIDTH=9 %i %i %i

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 -show-ports miter

##########

read_verilog <<EOT
module wreduce_sub_test3(input [3:0] i, input [7:0] j, output [8:0] o);
    assign o = (j >> 4) - i;
endmodule
EOT

hierarchy -auto-top
proc
design -save gold

prep # calls wreduce

select -assert-count 1 t:$sub r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=5 %i %i %i

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 -show-ports miter

##########

read_verilog <<EOT
module wreduce_sub_test4(input [3:0] i, output [8:0] o);
    assign o = 5'b00010 - i;
endmodule
EOT

hierarchy -auto-top
proc
design -save gold

prep # calls wreduce

select -assert-count 1 t:$sub r:A_WIDTH=2 r:B_WIDTH=4 r:Y_WIDTH=5 %i %i %i

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 -show-ports miter