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