103 static __always_inline u64 field_multiplier(u64 field)  in field_multiplier()  argument
105 	if ((field | (field - 1)) & ((field | (field - 1)) + 1))  in field_multiplier()
107 	return field & -field;  in field_multiplier()
109 static __always_inline u64 field_mask(u64 field)  in field_mask()  argument
111 	return field / field_multiplier(field);  in field_mask()
114 static __always_inline __##type type##_encode_bits(base v, base field)	\
116 	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
118 	return to((v & field_mask(field)) * field_multiplier(field));	\
121 					base val, base field)		\
123 	return (old & ~to(field)) | type##_encode_bits(val, field);	\
126 					base val, base field)		\
128 	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
130 static __always_inline base type##_get_bits(__##type v, base field)	\
132 	return (from(v) & field)/field_multiplier(field);		\