static int compareTo()

in cassandra-analytics-core/src/main/java/org/apache/cassandra/spark/bulkwriter/util/FastByteOperations.java [213:246]

• 25 lines of code
• 6 McCabe index (conditional complexity)

        static int compareTo(Object buffer1, long offset1, int length1, Object buffer2, long offset2, int length2)
        {
            int minLength = Math.min(length1, length2);

            /*
             * Compare 8 bytes at a time. Benchmarking shows comparing 8 bytes at a
             * time is no slower than comparing 4 bytes at a time even on 32-bit.
             * On the other hand, it is substantially faster on 64-bit.
             */
            int wordComparisons = minLength & ~7;
            for (int index = 0; index < wordComparisons; index += Longs.BYTES)
            {
                long long1 = UNSAFE.getLong(buffer1, offset1 + index);
                long long2 = UNSAFE.getLong(buffer2, offset2 + index);

                if (long1 != long2)
                {
                    return BIG_ENDIAN ? UnsignedLongs.compare(long1, long2)
                                      : UnsignedLongs.compare(Long.reverseBytes(long1), Long.reverseBytes(long2));
                }
            }

            for (int index = wordComparisons; index < minLength; index++)
            {
                int byte1 = UNSAFE.getByte(buffer1, offset1 + index) & 0xFF;
                int byte2 = UNSAFE.getByte(buffer2, offset2 + index) & 0xFF;
                if (byte1 != byte2)
                {
                    return byte1 - byte2;
                }
            }

            return length1 - length2;
        }