This patch avoid overflow in profile_count::differs_from_p and also makes it to
return false from one of the values is undefined while other is defined.
gcc/ChangeLog:
* profile-count.cc (profile_count::differs_from_p): Fix overflow and
handling of undefined values.
{
gcc_checking_assert (compatible_p (other));
if (!initialized_p () || !other.initialized_p ())
- return false;
+ return initialized_p () != other.initialized_p ();
if ((uint64_t)m_val - (uint64_t)other.m_val < 100
|| (uint64_t)other.m_val - (uint64_t)m_val < 100)
return false;
if (!other.m_val)
return true;
- int64_t ratio = (int64_t)m_val * 100 / other.m_val;
+ uint64_t ratio;
+ safe_scale_64bit (m_val, 100, other.m_val, &ratio);
return ratio < 99 || ratio > 101;
}