XXH_rotl32
seed = XXH_rotl32(seed, 13);
h32 = XXH_rotl32(v1, 1) + XXH_rotl32(v2, 7) + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18);
h32 = XXH_rotl32(h32, 17) * PRIME32_4 ;
h32 = XXH_rotl32(h32, 11) * PRIME32_1 ;
h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18);
h32 = XXH_rotl32(h32, 17) * PRIME32_4;
h32 = XXH_rotl32(h32, 11) * PRIME32_1;