18 	unsigned long r = a | b;  in gcd()  local
21 		return r;  in gcd()
25 		return r & -r;  in gcd()
30 			return r & -r;  in gcd()
32 			return a << __ffs(r);  in gcd()
45 	unsigned long r = a | b;  in gcd()  local
48 		return r;  in gcd()
51 	r &= -r;  in gcd()
53 	while (!(b & r))  in gcd()
55 	if (b == r)  in gcd()
56 		return r;  in gcd()
59 		while (!(a & r))  in gcd()
61 		if (a == r)  in gcd()
62 			return r;  in gcd()
70 		if (a & r)  in gcd()