Comment # 4 on bug 1188327 from Richard Biener

const u64 *digits = (const u64 *)&d[1];

and then accessing *digits is bogus since the pointer is not aligned according
to its type.  A fix would be to do

  u64 digits_tem;
  memcpy (&digits_tem, digits, sizeof (u64));

instead of reading u64 from digits.