1  /* { dg-do compile } */
       2  /* { dg-options "-O -fdump-tree-dse1" } */
       3  
       4  typedef int vec __attribute__((vector_size (4 * sizeof (int))));
       5  void f (vec *x1, vec *x2)
       6  {
       7    vec m = { 1, 2, 3, 0 };
       8    vec n = { 3, 0, 1, 2 };
       9    vec y = __builtin_shuffle (*x1, *x2, n);
      10    vec z = __builtin_shuffle (y, m);
      11    *x1 = z;
      12  }
      13  
      14  /* { dg-final { scan-tree-dump-not "VEC_PERM_EXPR" "dse1" } } */