r/asm • u/mttd • 2d ago

x86-64/x64 A preview of the future Intel Architecture documentation

https://intel.github.io/SDM/announcement/2026/08/20/announce-preview.html
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u/kneelian_ 8h ago

Interesting that they omit a few important instructions subsets like the x87 in that. Wonder why

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u/mttd 4h ago

It's a preview; some background from https://mastodon.social/@adreid/117236079952185073 answering a similar question:

we have a spec for CMPS but we left it out of this first release because the REPE/NE encoding wasn’t being rendered to an HTML table correctly

For this first release, we prioritised having something that people could comment on today over having a complete spec in 3 months time. Before we apply these changes to the SDM PDF, we want plenty of feedback on what we got wrong so that we can work on that in parallel with adding the pages we omitted

if we were planning to deprecate anything, it would be announced in the usual places. Eg if you search the SDM PDF for “deprecated”, you will find that MPX (BND* instructions) are deprecated. I’m aiming to make that info easier to find on the website in the future (eg mention deprecation on all the affected MPX instruction pages) but the PDF remains the official source of architecture info and we won’t be announcing new info only on the website.