25 	unsigned long r = a | b;  in gcd()  local
28 		return r;  in gcd()
32 		return r & -r;  in gcd()
37 			return r & -r;  in gcd()
39 			return a << __ffs(r);  in gcd()
52 	unsigned long r = a | b;  in gcd()  local
55 		return r;  in gcd()
58 	r &= -r;  in gcd()
60 	while (!(b & r))  in gcd()
62 	if (b == r)  in gcd()
63 		return r;  in gcd()
66 		while (!(a & r))  in gcd()
68 		if (a == r)  in gcd()
69 			return r;  in gcd()
77 		if (a & r)  in gcd()