[Bug c/32575] [4.2/4.3 regression] With -ftree-vrp miscompiles a single line of code in SQLite

[jakub at gcc dot gnu dot org]

------- Comment #5 from jakub at gcc dot gnu dot org  2007-08-28 15:16 -------
Even more simplified testcase:

extern void abort (void);

struct S
{
  void *s1, *s2;
  unsigned char s3, s4, s5;
};

__attribute__((noinline))
void *foo (void)
{
  static struct S s;
  return &s;
}

__attribute__((noinline))
void *bar ()
{
  return (void *) 0;
}

__attribute__((noinline))
struct S *test (void *a, void *b)
{
  struct S *p, q;
  p = foo ();
  if (p == 0)
    {
      p = &q;
      __builtin_memset (p, 0, sizeof (*p));
    }
  if (a == 0)
    a = bar ();
  p->s1 = a;
  p->s2 = b;
  if (p == &q)
    p = 0;
  return p;
}

int
main (void)
{
  int a;
  int b;
  struct S *z = test ((void *) &a, (void *) &b);
  if (z == 0 || z->s1 != (void *) &a || z->s2 != (void *) &b || z->s3 || z->s4)
    abort ();
  return 0;
}


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu dot org
   Target Milestone|---                         |4.2.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32575