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Subject: [Bug rtl-optimization/45967] [4.5/4.6 Regression] gcc-4.5.x optimizes code with side-effects away
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45967

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-13 11:54:58 UTC ---
Testcase:

extern void abort (void);
void __attribute__((noinline,noclone))
foo (void *p_)
{
  int *p;
  int i;
  for (i = 0; i < sizeof(int *); ++i)
    ((char *)&p)[i] = ((char *)p_)[i];
  *p = 1;
}
int main()
{
  int i = 0;
  int *p = &i;
  foo (&p);
  if (i != 1)
    abort ();
  return 0;
}