Assembly language instructions implementation

Question

Is there some information source or technical draft (something like RFC for networking) describing implementation of particular instructions (eg mov , jmp , je , jle , inc , ...) for Intel architecture?

Some general talk is on wikipedia but I'd like to know perfectly what's happening under the hood.

Thank you

Answer 1

They are generally implemented with micro-code, you can read up on that here , it mostly depends on the type of processors you are looking into (embedded, multi-core, power saving etc), Intel has some architecture design details here (the rest of the manuals also have various more minor details).

Its a bit old school now, but you should also find this helpful and interesting, it details the in depth design of the Pentium 4 series of processors, including instruction set implementation.

Answer 2

The implementations of many (most?) instructions have changed substantially over time. You could look at (for one example) Agner Fog's web site for some information, but be aware that:

1. a lot of it is at least partially guesswork
2. some of it is clearly out of date
3. Some of it varies between current processors (especially Intel vs. AMD).

Answer 3

您可以在此处从Intel下载x86手册。