_FE_INVALID_ALL
u.bits[1] &= ~_FE_INVALID_ALL;
u.bits[1] &= ~(FE_ALL_EXCEPT | _FE_INVALID_ALL);
u.bits[1] &= ~_FE_INVALID_ALL;
u.bits[1] &= ~_FE_INVALID_ALL;
u.bits[1] &= ~(FE_ALL_EXCEPT | _FE_INVALID_ALL);
u.bits[1] &= ~_FE_INVALID_ALL;