Issue while calling randomize

SystemVerilog
,
1

What is wrong with the following code. Am I not supposed to use randomize method outside the class?

module top;
  typedef struct {
    bit [3:0] a;
    bit [3:0] b;
  } x_struct;
  
  class c1;
    rand x_struct x_st;
  endclass
  
  initial begin
    c1 c1_inst;
    c1_inst = new;
    
    void'( randomize(c1_inst));
  end
endmodule

The compiler throws error randomize method call failed.

2

In reply to verif_learner:

There’s nothing wrong with your code other than being unconventional. Why you not call c1_inst.randomize()?.

Works for me in 3 different simulators.

3

In reply to dave_59:

This is a tool support issue. I got error message saying “rand unpacked structs are not currently supported; use “-svrnc rand_struct” to enable their use.” with simvision.

And simulation went through with this command.

irun test_rand.sv -svrnc rand_struct

4

In reply to MayurKubavat:

thanks