Function band_hash

src/simhash/minhash.c:344–353

Compute band hash for band `b` from a MinHash signature. * Uses r=2 consecutive values starting at position b*r. */

/* Compute band hash for band `b` from a MinHash signature.
 * Uses r=2 consecutive values starting at position b*r. */
static uint32_t band_hash(const cbm_minhash_t *fp, int band) {
    int base = band * CBM_LSH_ROWS;
    /* Combine r=2 values into a single hash */
    uint32_t combined[CBM_LSH_ROWS];
    for (int r = 0; r < CBM_LSH_ROWS; r++) {
        combined[r] = fp->values[base + r];
    }
    uint64_t h = XXH3_64bits(combined, sizeof(combined));
    return (uint32_t)(h & LSH_BUCKET_MASK);
}

static void bucket_push(lsh_bucket_t *bucket, int entry_index) {
    if (bucket->count >= bucket->cap) {