https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106090
--- Comment #3 from Yang Wang <njuwy at smail dot nju.edu.cn> ---
(In reply to Yang Wang from comment #2)
> (In reply to Martin Liška from comment #1)
> > No, it's correct as it only contains do_it() call that is triggered the same
> > number times as line 20 minus one.
>
> (In reply to Martin Liška from comment #1)
> > No, it's correct as it only contains do_it() call that is triggered the same
> > number times as line 20 minus one.
>
> -: 0:Source:test.c
> -: 0:Graph:test.gcno
> -: 0:Data:test.gcda
> -: 0:Runs:1
> -: 1:volatile int cnt = 0;
> -: 2:
> -: 3:__attribute__((noinline, noclone)) static int
> 5: 4:last (void)
> -: 5:{
> 5: 6: return ++cnt % 5 == 0;
> -: 7:}
> -: 8:
> -: 9:__attribute__((noinline, noclone)) static void
> 6: 10:do_it (void)
> -: 11:{
> 6: 12: asm volatile ("" : : "r" (&cnt) : "memory");
> 6: 13:}
> -: 14:
> 1: 15:static void f1 (void)
> -: 16:{
> 1: 17: do_it();
> 4: 18: for (; 0<1; do_it())
> -: 19: {
> 5: 20: if (last ())
> 1: 21: break;
> -: 22: }
> 1: 23: do_it ();
> 1: 24:}
> -: 25:
> -: 26:int
> 1: 27:main ()
> -: 28:{
> 1: 29: f1 ();
> -: 30:}
>
> do_it() is indeed called 4 times,but I wonder how the coverage statistiscs
> of the for-statement is calculated. It doesn't become 5 untill the
> for-stamentment is completed.
> -: 0:Source:test.c
> -: 0:Graph:test.gcno
> -: 0:Data:test.gcda
> -: 0:Runs:1
> -: 1:volatile int cnt = 0;
> -: 2:
> -: 3:__attribute__((noinline, noclone)) static int
> 5: 4:last (void)
> -: 5:{
> 5: 6: return ++cnt % 5 == 0;
> -: 7:}
> -: 8:
> -: 9:__attribute__((noinline, noclone)) static void
> 6: 10:do_it (void)
> -: 11:{
> 6: 12: asm volatile ("" : : "r" (&cnt) : "memory");
> 6: 13:}
> -: 14:
> 1: 15:static void f1 (void)
> -: 16:{
> 1: 17: do_it();
> 5: 18: for (int a=0;0<1;do_it())
> -: 19: {
> 5: 20: if (last ())
> 1: 21: break;
> -: 22: }
> 1: 23: do_it ();
> 1: 24:}
> -: 25:
> -: 26:int
> 1: 27:main ()
> -: 28:{
> 1: 29: f1 ();
> -: 30:}
Besides, GCov doesn't seem to provide voerage statistics for "for(;;)" .
-: 0:Source:test.c
-: 0:Graph:test.gcno
-: 0:Data:test.gcda
-: 0:Runs:1
-: 1:volatile int cnt = 0;
-: 2:
-: 3:__attribute__((noinline, noclone)) static int
5: 4:last (void)
-: 5:{
5: 6: return ++cnt % 5 == 0;
-: 7:}
-: 8:
-: 9:__attribute__((noinline, noclone)) static void
6: 10:do_it (void)
-: 11:{
6: 12: asm volatile ("" : : "r" (&cnt) : "memory");
6: 13:}
-: 14:
1: 15:static void f1 (void)
-: 16:{
1: 17: do_it();
-: 18: for (; ; )
-: 19: {
5: 20: if (last ())
1: 21: break;
4: 22: do_it();
-: 23: }
1: 24: do_it ();
1: 25:}
-: 26:
-: 27:int
1: 28:main ()
-: 29:{
1: 30: f1 ();
-: 31:}
