Public bug reported:
OS: Ubuntu 12.04.3 LTS
gcc version: 4.6.3-1ubuntu5
It's a modificated test case from gcc-4.6.3 testsuite (20000412-2.c):
int f(int a){
int x = (( & a)[(((((( a % 10) * ( a % 10)) % 10) > (((10 - ( a % 10)) * (10
- ( a % 10))) % 10))) * 314160879)]);
if (x==0)
return 1;
return f(x-1);
}
int main(int argc,char **argv)
{
if (f (2) != 1)
abort ();
exit (0);
}
"((((( a % 10) * ( a % 10)) % 10) > (((10 - ( a % 10)) * (10 - ( a %
10))) % 10)))" is a predicate and always equal to 0. So "x" is
actually equal to "a".
As you can see this test should exit successfully, but if it was
compiled with optimization (O2 and higher, O1 works fine) segmentation
fault happens during execution.
** Affects: gcc-4.6 (Ubuntu)
Importance: Undecided
Status: New
** Tags: optimizer
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https://bugs.launchpad.net/bugs/1250941
Title:
optimization of a recursive function cause segmentation fault during
execution (in very rare cases)
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