[Bug tree-optimization/53366] wrong code generation by tree vectorizer using AVX

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53366

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1

--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-05-16 16:48:39 
UTC ---
Even more reduced testcase, fails with -O3 -mavx, works with -O3 -msse4:

--cut here--
struct S { double v[3]; };
struct T { struct S r, i; };
struct U { struct T j[2]; };

void __attribute__((noinline))
foo (struct U *__restrict p1,
     const double _Complex * __restrict x)
{
  int i, j;

  for (j = 0; j < 2; ++j)
    {
      double a = __builtin_creal (x[j]);
      double b = __builtin_cimag (x[j]);
      double c = __builtin_creal (x[j+2]);
      double d = __builtin_cimag (x[j+2]);

      for (i = 0; i < 3; ++i)
    {
      p1->j[j].r.v[i] += a;
      p1->j[j].r.v[i] += c;

      p1->j[j].i.v[i] += b;
      p1->j[j].i.v[i] += d;
    }
    }
}

_Complex double x[4];

struct U p1;

int
main ()
{
  int i, j;

  for (i = 0; i < 4; ++i)
    x[i] = i + 1.0iF * (2 * i);

  foo (&p1, x);

  for (j = 0; j < 2; ++j)
    for (i = 0; i < 3; ++i)
      if (p1.j[j].r.v[i] != __builtin_creal (x[j] + x[j+2])
      || p1.j[j].i.v[i] != __builtin_cimag (x[j] + x[j+2]))
    __builtin_abort ();

  return 0;
}
--cut here--