From: "zhaoxiu.zeng" <zhaoxiu.z...@gmail.com> Date: Sun, 27 Mar 2016 14:43:10 +0800
> + > +/* > + * parityN: returns the parity of a N-bit word, > + * i.e. the number of 1-bits in x modulo 2. > + */ > + > +#define __arch_parity4(w) (__arch_hweight8((w) & 0xf) & 1) > +#define __arch_parity8(w) (__arch_hweight8(w) & 1) > +#define __arch_parity16(w) (__arch_hweight16(w) & 1) > +#define __arch_parity32(w) (__arch_hweight32(w) & 1) > +#define __arch_parity64(w) ((unsigned int)__arch_hweight64(w) & 1) This looks like asm-generic/ material to me.
