yosys/tests/techmap/constmap.ys

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read_verilog << EOT
module test();
wire [31:0] in;
wire [31:0] out;
assign out = in + 16;
endmodule
EOT
constmap -cell const_cell O value
select -assert-count 1 t:const_cell
select -assert-count 1 r:value=16
design -reset
read_verilog << EOT
module test();
wire [31:0] in;
wire [31:0] out1;
wire [31:0] out2;
assign out1 = in + 16;
assign out2 = in + 32;
endmodule
EOT
constmap -cell const_cell O value
select -assert-count 2 t:const_cell
select -assert-count 1 r:value=16
select -assert-count 1 r:value=32