105 	unsigned int csum;  in ip_fast_csum()  local
108 	csum = word[0];  in ip_fast_csum()
109 	csum += word[1];  in ip_fast_csum()
110 	carry = (csum < word[1]);  in ip_fast_csum()
111 	csum += carry;  in ip_fast_csum()
113 	csum += word[2];  in ip_fast_csum()
114 	carry = (csum < word[2]);  in ip_fast_csum()
115 	csum += carry;  in ip_fast_csum()
117 	csum += word[3];  in ip_fast_csum()
118 	carry = (csum < word[3]);  in ip_fast_csum()
119 	csum += carry;  in ip_fast_csum()
123 		csum += *word;  in ip_fast_csum()
124 		carry = (csum < *word);  in ip_fast_csum()
125 		csum += carry;  in ip_fast_csum()
129 	return csum_fold(csum);  in ip_fast_csum()