module tb;
    logic [4:0] register_index;
    logic [2:0] abi_class;
    integer index, args=0, saved=0, temporaries=0, fixed=0;
    string trace_file;
    abi_registers dut (.*);
    initial begin
        if ($value$plusargs("trace=%s", trace_file)) begin $dumpfile(trace_file); $dumpvars(0, tb); end
        for (index=0; index<32; index+=1) begin
            register_index=index[4:0]; #1;
            case (abi_class)
                3: args+=1;
                4: saved+=1;
                5: temporaries+=1;
                0,1,2,6: fixed+=1;
                default: $fatal(1, "FAIL class index=%0d class=%0d", index, abi_class);
            endcase
        end
        if (args!=8 || saved!=12 || temporaries!=7 || fixed!=5) $fatal(1, "FAIL counts %0d %0d %0d %0d", args,saved,temporaries,fixed);
        $display("PASS task02 args=8 saved=12 temporaries=7 fixed=5");
        $finish;
    end
endmodule