expbits
BFINS(expbits(*f++),p,co,fw);
BFINS(~expbits(*f++),p,co,fw);
BFINS(expbits(ch),p,co,fw);
BFINS(~expbits(ch),p,co,fw);
static inline uint32_t expbits(uint32_t);
*(uint16_t *)p = expbits(*kf++);
*p = expbits(*f++);
*(uint16_t *)p = ~expbits(*kf++);
*p = ~expbits(*f++);
*(uint16_t *)p = expbits(data | (data >> 1));
*p = expbits(data | (data >> 1));
*(uint16_t *)p = ~expbits(data | (data >> 1));
*p = ~expbits(data | (data >> 1));