1  /* PR target/82524 */
       2  
       3  struct S { unsigned char b, g, r, a; };
       4  union U { struct S c; unsigned v; };
       5  
       6  static inline unsigned char
       7  foo (unsigned char a, unsigned char b)
       8  {
       9    return ((a + 1) * b) >> 8;
      10  }
      11  
      12  __attribute__((noinline, noclone)) unsigned
      13  bar (union U *x, union U *y)
      14  {
      15    union U z;
      16    unsigned char v = x->c.a;
      17    unsigned char w = foo (y->c.a, 255 - v);
      18    z.c.r = foo (x->c.r, v) + foo (y->c.r, w);
      19    z.c.g = foo (x->c.g, v) + foo (y->c.g, w);
      20    z.c.b = foo (x->c.b, v) + foo (y->c.b, w);
      21    z.c.a = 0;
      22    return z.v;
      23  }
      24  
      25  int
      26  main ()
      27  {
      28    union U a, b, c;
      29    if ((unsigned char) ~0 != 255 || sizeof (unsigned) != 4)
      30      return 0;
      31    a.c = (struct S) { 255, 255, 255, 0 };
      32    b.c = (struct S) { 255, 255, 255, 255 };
      33    c.v = bar (&a, &b);
      34    if (c.c.b != 255 || c.c.g != 255 || c.c.r != 255 || c.c.a != 0)
      35      __builtin_abort ();
      36    return 0;
      37  }