102 	unsigned int csum;  in ip_fast_csum()  local
105 	csum = word[0];  in ip_fast_csum()
106 	csum += word[1];  in ip_fast_csum()
107 	carry = (csum < word[1]);  in ip_fast_csum()
108 	csum += carry;  in ip_fast_csum()
110 	csum += word[2];  in ip_fast_csum()
111 	carry = (csum < word[2]);  in ip_fast_csum()
112 	csum += carry;  in ip_fast_csum()
114 	csum += word[3];  in ip_fast_csum()
115 	carry = (csum < word[3]);  in ip_fast_csum()
116 	csum += carry;  in ip_fast_csum()
120 		csum += *word;  in ip_fast_csum()
121 		carry = (csum < *word);  in ip_fast_csum()
122 		csum += carry;  in ip_fast_csum()
126 	return csum_fold(csum);  in ip_fast_csum()