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/* PR tree-optimization/27285 */

/* PR tree-optimization/45122 */

/* { dg-do run } */

/* { dg-options "-O2 -funsafe-loop-optimizations" } */

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;

}