1  /* PR c/78408 */
       2  /* { dg-do compile { target size32plus } } */
       3  /* { dg-options "-O2 -fdump-tree-fab1-details" } */
       4  /* { dg-final { scan-tree-dump-times "after previous" 17 "fab1" } } */
       5  
       6  struct S { char a[33]; };
       7  struct T { char a[65536]; };
       8  void bar (int, struct S *, struct S *, struct T *, struct T *);
       9  void baz (char *, char *);
      10  
      11  void
      12  f1 (void)
      13  {
      14    struct S a, b;
      15    struct T c, d;
      16    a = b = (struct S) {};
      17    c = d = (struct T) {};
      18    bar (1, &a, &b, &c, &d);
      19  }
      20  
      21  void
      22  f2 (void)
      23  {
      24    struct S a, b;
      25    struct T c, d;
      26    b = (struct S) {};
      27    a = b;
      28    d = (struct T) {};
      29    c = d;
      30    bar (2, &a, &b, &c, &d);
      31  }
      32  
      33  void
      34  f3 (void)
      35  {
      36    struct S a, b;
      37    struct T c, d;
      38    __builtin_memset (&b, 0, sizeof (b));
      39    a = b;
      40    __builtin_memset (&d, 0, sizeof (d));
      41    c = d;
      42    bar (3, &a, &b, &c, &d);
      43  }
      44  
      45  
      46  void
      47  f4 (void)
      48  {
      49    struct S a, b;
      50    struct T c, d;
      51    b = (struct S) {};
      52    __builtin_memcpy (&a, &b, sizeof (b));
      53    d = (struct T) {};
      54    __builtin_memcpy (&c, &d, sizeof (d));
      55    bar (4, &a, &b, &c, &d);
      56  }
      57  
      58  void
      59  f5 (void)
      60  {
      61    struct S a, b;
      62    struct T c, d;
      63    __builtin_memset (&b, 0, sizeof (b));
      64    __builtin_memcpy (&a, &b, sizeof (b));
      65    __builtin_memset (&d, 0, sizeof (d));
      66    __builtin_memcpy (&c, &d, sizeof (d));
      67    bar (5, &a, &b, &c, &d);
      68  }
      69  
      70  void
      71  f6 (void)
      72  {
      73    struct S a, b, e, g;
      74    struct T c, d, f, h;
      75    g = e = a = b = (struct S) {};
      76    h = f = c = d = (struct T) {};
      77    bar (6, &a, &b, &c, &d);
      78    bar (6, &e, &g, &f, &h);
      79  }
      80  
      81  void
      82  f7 (void)
      83  {
      84    char a[64], b[64];
      85    __builtin_memset (a + 13, 2, 27);
      86    __builtin_memcpy (b + 4, a + 17, 23);
      87    baz (a, b);
      88  }