[Bug tree-optimization/20100] [4.0 regression] static call incorrectly judged constant, moved out of loop

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-20 
15:50 -------
And here is a reduced (and self contained) testcase for that case:
int func_pure (void) __attribute__ ((pure));
void func_other (int);
int global_int;
void abort ();
void func_other(int a)
{
  if (a != global_int)
   abort ();
  global_int++;
}

int func_pure(void)
{
  return global_int;
}

int
func_loop (int arg)
{
 // global_int ++;
  while (arg--)
      func_other (func_pure ());
}

int main(void)
{
  func_loop(10);
  return 0;
}

Uncommenting global_int++; will cause the testcase to work as we have vops now.
I think this is just like the testcase which was attached in comment #1 because 
if I add a variable and 
have it set a global variable, it works too.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20100