mask_nbit_l
#define mask_nbit_l(u) ((void)0)
#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
#define mask_nbit_l(u) ((void)0)
#define mask_nbit_l(u) ((u).bits.manh &= ~LDBL_NBIT)
#define mask_nbit_l(u) ((void)0)
#define mask_nbit_l(u) ((void)0)
#define mask_nbit_l(u) ((void)0)