sngu_exp
u.sngu_exp = SNG_EXP_BIAS + 31 - l;
signed int exp = ux.sngu_exp - SNG_EXP_BIAS;
signed int exp = ux.sngu_exp - SNG_EXP_BIAS;
ux.sngu_exp = SNG_EXP_BIAS + 63 - l;
ux.sngu_exp = SNG_EXP_BIAS + 63 - l;