hello sir ToanBao122;
first, you need check your own processor and deal with that, first is ego. After, try compatibility, others.
You can take all processor instructions from manuals of processor designers; so, intel, amd, others, ... . This does not means that your assembler supports all of that, ... .
When you change from the ground, this will make more sense.
If you're talking of pc computers, check intel board too, amd board too , ..., you can even see persons sugesting new instructions that after can be concrete, ... .