dblu_fracl
u.dblu_fracl = x << (32 - DBL_FRACHBITS);
r |= ux.dblu_fracl;
r |= ux.dblu_fracl;
ux.dblu_fracl = u.ul[L];
ux.dblu_fracl = u.ul[L];
#define DBLU_ZEROFRAC_P(u) (((u).dblu_frach|(u).dblu_fracl) != 0)