AFAIK, the FPU was a stack calculator. So you pushed things on and ran calculati... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		lallysingh 7 months ago \| parent \| context \| favorite \| on: Intel's $475M error: the silicon behind the Pentiu... AFAIK, the FPU was a stack calculator. So you pushed things on and ran calculations on the stack. https://en.wikibooks.org/wiki/X86_Assembly/Floating_Point

Sesse__ 7 months ago [–]

It's only a stack machine in front, really. Behind-the-scenes, it's probably just eight registers (the stack is a fixed size, it doesn't spill to memory or anything).

lallysingh 7 months ago | [–]

Definitely was 8 regs: https://intranetssn.github.io/www.ssn.net/twiki/pub/CseIntra... also where you'd see 'long double'

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact