__htole64
#define __lemtoh64(_x) __htole64(*(__uint64_t *)(_x))
#define __htolem64(_x, _v) (*(__uint64_t *)(_x) = __htole64(_v))
#define htole64(x) __htole64(x)
#define le64toh(x) __htole64(x)
#define letoh64(x) __htole64(x)