yosys/tests/opt/opt_share_bug2336.ys

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read_verilog <<EOT
module top(input [3:0] A, B, C, input S, output [2:0] O);
wire [3:0] tb = A + B;
wire [3:0] tc = A + C;
assign O = S ? tb[3:1] : tc[3:1];
endmodule
EOT
equiv_opt -assert opt_share