SIP_ULL
H->v0 = SIP_ULL(0x736f6d65U, 0x70736575U) ^ key->k[0];
H->v1 = SIP_ULL(0x646f7261U, 0x6e646f6dU) ^ key->k[1];
H->v2 = SIP_ULL(0x6c796765U, 0x6e657261U) ^ key->k[0];
H->v3 = SIP_ULL(0x74656462U, 0x79746573U) ^ key->k[1];
const uint64_t expected = SIP_ULL(0xa129ca61U, 0x49be45e5U);
#define COLLIDING_HASH_SALT (unsigned long)SIP_ULL(0xffffffffU, 0xff99fc90U)