Iterators dont inline

[4n0n4me]

    {
                    {
                            NI i;
                            NI res;
                            i = (NI)0;
                            res = ((NI)1);
                            {
                                    while (1) {
                                            if (!(res <= ((NI)1000000))) goto 
LA6;
                                            i = ((NI) (res));
                                            nimZeroMem((void*)(&i__test_u35), 
sizeof(tyObject_A__iB29a5WBVxBSpVcclUg0YVA));
                                            i__test_u35.a = i;
                                            b__test_u34 += i__test_u35.a;
                                            res += ((NI)1);
                                    } LA6: ;
                            }
                    }
            }
    
    
    Run
    
    
    {
                    {
                            tyObject_A__iB29a5WBVxBSpVcclUg0YVA i_2;
                            nimZeroMem((void*)(&i_2), 
sizeof(tyObject_A__iB29a5WBVxBSpVcclUg0YVA));
                            {
                                    NI i_3;
                                    NI res_2;
                                    i_3 = (NI)0;
                                    res_2 = ((NI)1);
                                    {
                                            while (1) {
                                                    if (!(res_2 <= 
((NI)1000000))) goto LA15;
                                                    i_3 = ((NI) (res_2));
                                                    nimZeroMem((void*)(&i_2), 
sizeof(tyObject_A__iB29a5WBVxBSpVcclUg0YVA));
                                                    i_2.a = i_3;
                                                    i__test_u124 = i_2;
                                                    b__test_u34 += 
i__test_u124.a;
                                                    res_2 += ((NI)1);
                                            } LA15: ;
                                    }
                            }
                    }
            }
    
    
    Run

Maybe there is a copy which causes slowness? I am not sure