/* SPDX-License-Identifier: LGPL-2.1 * * Based on Paul Hsieh's (LGPG 2.1) hash function * From: http://www.azillionmonkeys.com/qed/hash.html */ #define get16bits(d) (*((const __u16 *) (d))) static __always_inline__u32 SuperFastHash (const char *data, int len, __u32 initval) {	__u32 hash = initval;	__u32 tmp;	int rem; 	if (len <= 0 || data == NULL) return 0; 	rem = len & 3;	len >>= 2; 	/* Main loop */#pragma clang loop unroll(full)	for (;len > 0; len--) {		hash  += get16bits (data);		tmp    = (get16bits (data+2) << 11) ^ hash;		hash   = (hash << 16) ^ tmp;		data  += 2*sizeof (__u16);		hash  += hash >> 11;	} 	/* Handle end cases */	switch (rem) {        case 3: hash += get16bits (data);                hash ^= hash << 16;                hash ^= ((signed char)data[sizeof (__u16)]) << 18;                hash += hash >> 11;                break;        case 2: hash += get16bits (data);                hash ^= hash << 11;                hash += hash >> 17;                break;        case 1: hash += (signed char)*data;                hash ^= hash << 10;                hash += hash >> 1;	} 	/* Force "avalanching" of final 127 bits */	hash ^= hash << 3;	hash += hash >> 5;	hash ^= hash << 4;	hash += hash >> 17;	hash ^= hash << 25;	hash += hash >> 6; 	return hash;}