[Ltp-coverage] Lcov issue

[vanson.dang]

Dear All.

When I use Lcov to test code coverage. I see that. in some function, It return a value.
But return line never hit. I'm sure that return line hit. Why this error.
Ex
     162                 : sint16_t _scaling_4x4_dc(sint32_t* dc_values,   uint32_t* coded_level,  sint16_t* coded_run, sint16_t* coded_sign, const sint16_t* scan,
                                    _all_struct_t* _all_structs)
     163            1734 : {

     164                 :
     165             867 :     sint16_t i, j, coeffcnt = 0;

     166             867 :     sint32_t Level;

     167             867 :     sint16_t run = 0;

     168                 :
     169           14739 :     for (i = 0; i < 16 ; i++) { /* The part is designed to be one dimensional process */

     170           13872 :         j = scan[i];  /* mapping */

     171           13872 :         Level = (sint32_t)(abs((sint32_t) dc_values[j]));

     172           13872 :         if (Level != 0) {

     173            1357 :             coded_level[coeffcnt] = Level;

     174            1357 :             coded_sign[coeffcnt] = _sign(dc_values[j], _all_structs);

     175            1357 :             coded_run[coeffcnt] = run;

     176            1357 :             run = 0;

     177            1357 :             coeffcnt++;

     178                 :         } else {
     179                 :
     180           12515 :             run++;

     181                 :         }
     182                 :
     183                 :     }
     184             867 :     coded_level[coeffcnt] = 0;

     185                 :
     186               0 :     return coeffcnt;                         /* <-- why it not hit ? */

     187                 : }


Thank !
=========================================================
Dang, VAN SON, (Mr) <vanson.dang@...>
Embedded Software (ESW) Engineer
Panasonic Hanoi Laboratory
Panasonic R&D Center Vietnam Co., Ltd.
No.1 Lang Hoa-Lac Rd., Me Tri, Tu Liem, Hanoi, Vietnam
Tel: [phone] Ext 115
Fax: [phone]
Tax code: 01 01 824243-003
==========================================================


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[Peter Oberparleiter-4]

Hello,

vanson.dang@... wrote:
> Dear All.
>
> When I use Lcov to test code coverage. I see that. in some function, It return a value.
> But return line never hit. I'm sure that return line hit. Why this error.
[...]
>      184             867 :     coded_level[coeffcnt] = 0;
>
>      185                 :
>      186               0 :     return coeffcnt;                         /* <-- why it not hit ? */
>
>      187                 : }

If you specify optimization flags (-O) during compilation, try removing
those. GCC's code coverage instrumentation does not work well with code
optimization. See also the gcov man page for more information on the
possible effects of using optimization while testing code coverage.


Regards,
   Peter Oberparleiter


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