in src/main/java/org/apache/datasketches/theta/BitPacking.java [3061:3133]
static void packBits60(final long[] values, final int i, final byte[] buf, int off) {
buf[off++] = (byte) (values[i + 0] >>> 52);
buf[off++] = (byte) (values[i + 0] >>> 44);
buf[off++] = (byte) (values[i + 0] >>> 36);
buf[off++] = (byte) (values[i + 0] >>> 28);
buf[off++] = (byte) (values[i + 0] >>> 20);
buf[off++] = (byte) (values[i + 0] >>> 12);
buf[off++] = (byte) (values[i + 0] >>> 4);
buf[off] = (byte) (values[i + 0] << 4);
buf[off++] |= values[i + 1] >>> 56;
buf[off++] = (byte) (values[i + 1] >>> 48);
buf[off++] = (byte) (values[i + 1] >>> 40);
buf[off++] = (byte) (values[i + 1] >>> 32);
buf[off++] = (byte) (values[i + 1] >>> 24);
buf[off++] = (byte) (values[i + 1] >>> 16);
buf[off++] = (byte) (values[i + 1] >>> 8);
buf[off++] = (byte) (values[i + 1]);
buf[off++] = (byte) (values[i + 2] >>> 52);
buf[off++] = (byte) (values[i + 2] >>> 44);
buf[off++] = (byte) (values[i + 2] >>> 36);
buf[off++] = (byte) (values[i + 2] >>> 28);
buf[off++] = (byte) (values[i + 2] >>> 20);
buf[off++] = (byte) (values[i + 2] >>> 12);
buf[off++] = (byte) (values[i + 2] >>> 4);
buf[off] = (byte) (values[i + 2] << 4);
buf[off++] |= values[i + 3] >>> 56;
buf[off++] = (byte) (values[i + 3] >>> 48);
buf[off++] = (byte) (values[i + 3] >>> 40);
buf[off++] = (byte) (values[i + 3] >>> 32);
buf[off++] = (byte) (values[i + 3] >>> 24);
buf[off++] = (byte) (values[i + 3] >>> 16);
buf[off++] = (byte) (values[i + 3] >>> 8);
buf[off++] = (byte) (values[i + 3]);
buf[off++] = (byte) (values[i + 4] >>> 52);
buf[off++] = (byte) (values[i + 4] >>> 44);
buf[off++] = (byte) (values[i + 4] >>> 36);
buf[off++] = (byte) (values[i + 4] >>> 28);
buf[off++] = (byte) (values[i + 4] >>> 20);
buf[off++] = (byte) (values[i + 4] >>> 12);
buf[off++] = (byte) (values[i + 4] >>> 4);
buf[off] = (byte) (values[i + 4] << 4);
buf[off++] |= values[i + 5] >>> 56;
buf[off++] = (byte) (values[i + 5] >>> 48);
buf[off++] = (byte) (values[i + 5] >>> 40);
buf[off++] = (byte) (values[i + 5] >>> 32);
buf[off++] = (byte) (values[i + 5] >>> 24);
buf[off++] = (byte) (values[i + 5] >>> 16);
buf[off++] = (byte) (values[i + 5] >>> 8);
buf[off++] = (byte) (values[i + 5]);
buf[off++] = (byte) (values[i + 6] >>> 52);
buf[off++] = (byte) (values[i + 6] >>> 44);
buf[off++] = (byte) (values[i + 6] >>> 36);
buf[off++] = (byte) (values[i + 6] >>> 28);
buf[off++] = (byte) (values[i + 6] >>> 20);
buf[off++] = (byte) (values[i + 6] >>> 12);
buf[off++] = (byte) (values[i + 6] >>> 4);
buf[off] = (byte) (values[i + 6] << 4);
buf[off++] |= values[i + 7] >>> 56;
buf[off++] = (byte) (values[i + 7] >>> 48);
buf[off++] = (byte) (values[i + 7] >>> 40);
buf[off++] = (byte) (values[i + 7] >>> 32);
buf[off++] = (byte) (values[i + 7] >>> 24);
buf[off++] = (byte) (values[i + 7] >>> 16);
buf[off++] = (byte) (values[i + 7] >>> 8);
buf[off] = (byte) (values[i + 7]);
}