39 	unsigned long csum = 0;  in ip_fast_csum()  local
43 		csum += ((const unsigned int *)iph)[pos];  in ip_fast_csum()
45 			csum += csum < ((const unsigned int *)iph)[pos];  in ip_fast_csum()
66 				not	%[fold_temp], %[csum]		\n\  in ip_fast_csum()
67 				rori	%[csum], %[csum], 16		\n\  in ip_fast_csum()
68 				sub	%[csum], %[fold_temp], %[csum]	\n\  in ip_fast_csum()
70 			: [csum] "+r" (csum), [fold_temp] "=&r" (fold_temp));  in ip_fast_csum()
74 				rori	%[fold_temp], %[csum], 32	\n\  in ip_fast_csum()
75 				add	%[csum], %[fold_temp], %[csum]	\n\  in ip_fast_csum()
76 				srli	%[csum], %[csum], 32		\n\  in ip_fast_csum()
77 				not	%[fold_temp], %[csum]		\n\  in ip_fast_csum()
78 				roriw	%[csum], %[csum], 16		\n\  in ip_fast_csum()
79 				subw	%[csum], %[fold_temp], %[csum]	\n\  in ip_fast_csum()
81 			: [csum] "+r" (csum), [fold_temp] "=&r" (fold_temp));  in ip_fast_csum()
83 		return (__force __sum16)(csum >> 16);  in ip_fast_csum()
87 	csum += ror64(csum, 32);  in ip_fast_csum()
88 	csum >>= 32;  in ip_fast_csum()
90 	return csum_fold((__force __wsum)csum);  in ip_fast_csum()