text: /* PR tree-optimization/27285 */
  
  extern void abort (void);
  
  struct S { unsigned char a, b, c, d[16]; };
  
  void __attribute__ ((noinline))
  foo (struct S *x, struct S *y)
  {
    int a, b;
    unsigned char c, *d, *e;
  
    b = x->b;
    d = x->d;
    e = y->d;
    a = 0;
    while (b)
      {
        if (b >= 8)
  	{
  	  c = 0xff;
  	  b -= 8;
  	}
        else
  	{
  	  c = 0xff << (8 - b);
  	  b = 0;
  	}
  
        e[a] = d[a] & c;
        a++;
      }
  }
  
  int
  main (void)
  {
    struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }};
    struct S y = { 0, 0, 0, { 0 }};
  
    foo (&x, &y);
    if (x.d[0] != y.d[0] || x.d[1] != y.d[1]
        || x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3])
      abort ();
     return 0;
  }
  