int__builtin_ctz(unsigned int x){	unsigned int r;	if(x == 0)		return 32;	for(r = 0; (x & 1) == 0; x >>= 1, r++);	return r;} int__builtin_clz(unsigned int x){	unsigned int r;	if(x == 0)		return 32;	for(r = 0; (x & (1UL<<31)) == 0; x <<= 1, r++);	return r;} int__builtin_clzll(unsigned long long x){	unsigned long long r;	if(x == 0)		return 64;	for(r = 0; (x & (1ULL<<63)) == 0; x <<= 1, r++);	return r;}