[carbonguy]

For me the article was well worth it; where else but in ISA discussions can you find gems like the following?

> Does a non-instruction that is non-defined and unofficially guaranteed to non-execute exactly as if it had never been in the instruction set to begin with count as an x86 instruction? For that matter, does UD2 itself, the defined undefined instruction, count as an instruction?

[sandinmyjoints]

This was why I posted it -- I learned a lot more than the answer to the title.