[Bug c/39759] New: bug in optimalization O2

[vcelakv at seznam dot cz]

gcc --version
gcc (SUSE Linux) 4.3.2 [gcc-4_3-branch revision 141291]

code a.c:
#include <stdio.h>
main() {
int i;
for (i = 1; i > 0; i *= 2)
   printf("%d\n",i);
}

1. build:
gcc -O a.c -o a
Run:
./a
1
2
4
...
4536870912
1073741824

2. build:
gcc -O2 a.c -o a
Run:
./a
1
2
4
...
4536870912
1073741824
0
0
0
0
...


-- 
           Summary: bug in optimalization O2
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vcelakv at seznam dot cz


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39759