Write a constraint to generate prime numbers in an array between 1 and 200

SystemVerilog
1

write a constraint to generate prime numbers in an array between 1 and 200.

2

In reply to shaiksalim:
https://verificationacademy.com/forums/systemverilog/prime-numbers-constraint

3

In reply to shaiksalim:

write a constraint to generate prime numbers in an array between 1 and 200.

function void post_randomize();
    bit got_num ;
    prim_arr.push_back(2);
    for(bit [7:0] idx = 3; idx < 200 ; idx ++) begin
        got_num = 1;
        for(int jdx = 0 ; jdx < prim_arr.size(); jdx++) begin
                if(idx % prim_arr[jdx] == 0) begin
                    got_num = 0;
                    break;
                end
        end
        if(got_num) begin
            prim_arr.push_back(idx);
        end
    end
    //Note: you don't need this. It was for different question.
    //tmp_queue = prim_arr.find(item) with (item%10 == 7);
endfunction : post_randomize
4

class prime_numbers;
rand int unsigned prime;
constraint const_prime {prime.size inside{200};

                      foreach(prime[i])
                        if (i>1 && (!((i%2==0 && i!=2) || (i%3==0 && i!=3)  ||  (i%5==0 && i!=5) ||  (i%7==0 && i!=7))))
                          prime[i]==i;
                      else
                        prime[i]==2;
                      }

function void post_randomize;
prime = prime.unique();
endfunction

endclass

module tb();
prime_numbers pm;

initial
begin
pm=new();
assert(pm.randomize());
$display(“the prime: %p”,pm.prime);
end
endmodule

I think this may help you.