Who Is Vfmaddrnd231pd?
This article investigates a mysterious, non-existent x86 instruction called vfmaddrnd231pd mentioned in Intel documentation. The author explores why the instruction fails to execute and suggests it may be a documentation error or a ghost feature.
Why it matters
It highlights the complexities of hardware documentation and the potential for 'ghost' instructions to cause confusion in low-level software development.
Who is vfmaddrnd231pd?? | purplesyringa's blog
vfmaddrnd231pd is a unique instruction from the FMA instruction set. Most instructions in that set have mnemonics like vfmadd231pd , but here rnd means something very specific. The Intel Software Development Manual documents it as:
Get smarter about the news
Sign up free for a feed built around what you actually care about, Dive Deeper research on any story, and the full text of every article.
Create free accountAlready have an account? Sign in