__swab16s
__swab16s(dst++);
# define swab16s __swab16s
#define __cpu_to_le16s(x) __swab16s((x))
#define __le16_to_cpus(x) __swab16s((x))
#define __cpu_to_be16s(x) __swab16s((x))
#define __be16_to_cpus(x) __swab16s((x))