1  /* PR tree-optimization/27285 */
       2  /* PR tree-optimization/45122 */
       3  
       4  /* { dg-do run } */
       5  /* { dg-options "-O2" } */
       6  
       7  extern void abort (void);
       8  
       9  struct S { unsigned char a, b, c, d[16]; };
      10  
      11  void __attribute__ ((noinline))
      12  foo (struct S *x, struct S *y)
      13  {
      14    int a, b;
      15    unsigned char c, *d, *e;
      16  
      17    b = x->b;
      18    d = x->d;
      19    e = y->d;
      20    a = 0;
      21    while (b)
      22      {
      23        if (b >= 8)
      24  	{
      25  	  c = 0xff;
      26  	  b -= 8;
      27  	}
      28        else
      29  	{
      30  	  c = 0xff << (8 - b);
      31  	  b = 0;
      32  	}
      33  
      34        e[a] = d[a] & c;
      35        a++;
      36      }
      37  }
      38  
      39  int
      40  main (void)
      41  {
      42    struct S x = { 0, 25, 0, { 0xaa, 0xbb, 0xcc, 0xdd }};
      43    struct S y = { 0, 0, 0, { 0 }};
      44  
      45    foo (&x, &y);
      46    if (x.d[0] != y.d[0] || x.d[1] != y.d[1]
      47        || x.d[2] != y.d[2] || (x.d[3] & 0x80) != y.d[3])
      48      abort ();
      49     return 0;
      50  }