dblu_exp
u.dblu_exp = DBL_EXP_BIAS + 31 - l;
signed int exp = ux.dblu_exp - DBL_EXP_BIAS;
signed int exp = ux.dblu_exp - DBL_EXP_BIAS;
ux.dblu_exp = DBL_EXP_BIAS + 63 - l;
ux.dblu_exp = DBL_EXP_BIAS + 63 - l;