yosys/tests/opt/opt_expr_cmp.v

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module top(...);
input [3:0] a;
output o1 = 4'b0000 > a;
output o2 = 4'b0000 <= a;
output o3 = 4'b1111 < a;
output o4 = 4'b1111 >= a;
output o5 = a < 4'b0000;
output o6 = a >= 4'b0000;
output o7 = a > 4'b1111;
output o8 = a <= 4'b1111;
endmodule