rotl
rotl(uint32_t a, uint8_t n)
#define rotl(x,n) (((x) << ((int)((n) & 0x1f))) | ((x) >> ((int)((32 - ((n) & 0x1f))))))
#define rotl(x,n) (((x)<<(n))|((x)>>(32-(n))))
static __inline u32 rotl(u32 val, int bits)