Fastest way to check if a byte array is all zeros

Question

I have a byte[4096] and was wondering what the fastest way is to check if all values are zero?

Is there any way faster than doing:

byte[] b          


        

Answer 1

Someone suggested checking 4 or 8 bytes at a time. You actually can do this in Java:

LongBuffer longBuffer = ByteBuffer.wrap(b).asLongBuffer();
while (longBuffer.hasRemaining()) {
    if (longBuffer.get() != 0) {
        return false;
    }
}
return true;

Whether this is faster than checking byte values is uncertain, since there is so much potential for optimization.